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// SPDX-License-Identifier: GPL-2.0+
/*
* Originally from efivars.c
*
* Copyright (C) 2001,2003,2004 Dell <[email protected]>
* Copyright (C) 2004 Intel Corporation <[email protected]>
*/
#define pr_fmt(fmt) "efivars: " fmt
#include <linux/types.h>
#include <linux/sizes.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/smp.h>
#include <linux/efi.h>
#include <linux/ucs2_string.h>
/* Private pointer to registered efivars */
static struct efivars *__efivars;
static DEFINE_SEMAPHORE(efivars_lock, 1);
static efi_status_t check_var_size(bool nonblocking, u32 attributes,
unsigned long size)
{
const struct efivar_operations *fops;
efi_status_t status;
fops = __efivars->ops;
if (!fops->query_variable_store)
status = EFI_UNSUPPORTED;
else
status = fops->query_variable_store(attributes, size,
nonblocking);
if (status == EFI_UNSUPPORTED)
return (size <= SZ_64K) ? EFI_SUCCESS : EFI_OUT_OF_RESOURCES;
return status;
}
/**
* efivar_is_available - check if efivars is available
*
* @return true iff evivars is currently registered
*/
bool efivar_is_available(void)
{
return __efivars != NULL;
}
EXPORT_SYMBOL_GPL(efivar_is_available);
/**
* efivars_register - register an efivars
* @efivars: efivars to register
* @ops: efivars operations
*
* Only a single efivars can be registered at any time.
*/
int efivars_register(struct efivars *efivars,
const struct efivar_operations *ops)
{
int rv;
if (down_interruptible(&efivars_lock))
return -EINTR;
if (__efivars) {
pr_warn("efivars already registered\n");
rv = -EBUSY;
goto out;
}
efivars->ops = ops;
__efivars = efivars;
pr_info("Registered efivars operations\n");
rv = 0;
out:
up(&efivars_lock);
return rv;
}
EXPORT_SYMBOL_GPL(efivars_register);
/**
* efivars_unregister - unregister an efivars
* @efivars: efivars to unregister
*
* The caller must have already removed every entry from the list,
* failure to do so is an error.
*/
int efivars_unregister(struct efivars *efivars)
{
int rv;
if (down_interruptible(&efivars_lock))
return -EINTR;
if (!__efivars) {
pr_err("efivars not registered\n");
rv = -EINVAL;
goto out;
}
if (__efivars != efivars) {
rv = -EINVAL;
goto out;
}
pr_info("Unregistered efivars operations\n");
__efivars = NULL;
rv = 0;
out:
up(&efivars_lock);
return rv;
}
EXPORT_SYMBOL_GPL(efivars_unregister);
bool efivar_supports_writes(void)
{
return __efivars && __efivars->ops->set_variable;
}
EXPORT_SYMBOL_GPL(efivar_supports_writes);
/*
* efivar_lock() - obtain the efivar lock, wait for it if needed
* @return 0 on success, error code on failure
*/
int efivar_lock(void)
{
if (down_interruptible(&efivars_lock))
return -EINTR;
if (!__efivars->ops) {
up(&efivars_lock);
return -ENODEV;
}
return 0;
}
EXPORT_SYMBOL_NS_GPL(efivar_lock, EFIVAR);
/*
* efivar_lock() - obtain the efivar lock if it is free
* @return 0 on success, error code on failure
*/
int efivar_trylock(void)
{
if (down_trylock(&efivars_lock))
return -EBUSY;
if (!__efivars->ops) {
up(&efivars_lock);
return -ENODEV;
}
return 0;
}
EXPORT_SYMBOL_NS_GPL(efivar_trylock, EFIVAR);
/*
* efivar_unlock() - release the efivar lock
*/
void efivar_unlock(void)
{
up(&efivars_lock);
}
EXPORT_SYMBOL_NS_GPL(efivar_unlock, EFIVAR);
/*
* efivar_get_variable() - retrieve a variable identified by name/vendor
*
* Must be called with efivars_lock held.
*/
efi_status_t efivar_get_variable(efi_char16_t *name, efi_guid_t *vendor,
u32 *attr, unsigned long *size, void *data)
{
return __efivars->ops->get_variable(name, vendor, attr, size, data);
}
EXPORT_SYMBOL_NS_GPL(efivar_get_variable, EFIVAR);
/*
* efivar_get_next_variable() - enumerate the next name/vendor pair
*
* Must be called with efivars_lock held.
*/
efi_status_t efivar_get_next_variable(unsigned long *name_size,
efi_char16_t *name, efi_guid_t *vendor)
{
return __efivars->ops->get_next_variable(name_size, name, vendor);
}
EXPORT_SYMBOL_NS_GPL(efivar_get_next_variable, EFIVAR);
/*
* efivar_set_variable_locked() - set a variable identified by name/vendor
*
* Must be called with efivars_lock held. If @nonblocking is set, it will use
* non-blocking primitives so it is guaranteed not to sleep.
*/
efi_status_t efivar_set_variable_locked(efi_char16_t *name, efi_guid_t *vendor,
u32 attr, unsigned long data_size,
void *data, bool nonblocking)
{
efi_set_variable_t *setvar;
efi_status_t status;
if (data_size > 0) {
status = check_var_size(nonblocking, attr,
data_size + ucs2_strsize(name, 1024));
if (status != EFI_SUCCESS)
return status;
}
/*
* If no _nonblocking variant exists, the ordinary one
* is assumed to be non-blocking.
*/
setvar = __efivars->ops->set_variable_nonblocking;
if (!setvar || !nonblocking)
setvar = __efivars->ops->set_variable;
return setvar(name, vendor, attr, data_size, data);
}
EXPORT_SYMBOL_NS_GPL(efivar_set_variable_locked, EFIVAR);
/*
* efivar_set_variable() - set a variable identified by name/vendor
*
* Can be called without holding the efivars_lock. Will sleep on obtaining the
* lock, or on obtaining other locks that are needed in order to complete the
* call.
*/
efi_status_t efivar_set_variable(efi_char16_t *name, efi_guid_t *vendor,
u32 attr, unsigned long data_size, void *data)
{
efi_status_t status;
if (efivar_lock())
return EFI_ABORTED;
status = efivar_set_variable_locked(name, vendor, attr, data_size,
data, false);
efivar_unlock();
return status;
}
EXPORT_SYMBOL_NS_GPL(efivar_set_variable, EFIVAR);
efi_status_t efivar_query_variable_info(u32 attr,
u64 *storage_space,
u64 *remaining_space,
u64 *max_variable_size)
{
if (!__efivars->ops->query_variable_info)
return EFI_UNSUPPORTED;
return __efivars->ops->query_variable_info(attr, storage_space,
remaining_space, max_variable_size);
}
EXPORT_SYMBOL_NS_GPL(efivar_query_variable_info, EFIVAR);
| linux-master | drivers/firmware/efi/vars.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Extensible Firmware Interface
*
* Based on Extensible Firmware Interface Specification version 2.4
*
* Copyright (C) 2013, 2014 Linaro Ltd.
*/
#include <linux/dmi.h>
#include <linux/efi.h>
#include <linux/io.h>
#include <linux/memblock.h>
#include <linux/mm_types.h>
#include <linux/preempt.h>
#include <linux/rbtree.h>
#include <linux/rwsem.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/pgtable.h>
#include <asm/cacheflush.h>
#include <asm/efi.h>
#include <asm/mmu.h>
#include <asm/pgalloc.h>
#if defined(CONFIG_PTDUMP_DEBUGFS) || defined(CONFIG_ARM_PTDUMP_DEBUGFS)
#include <asm/ptdump.h>
static struct ptdump_info efi_ptdump_info = {
.mm = &efi_mm,
.markers = (struct addr_marker[]){
{ 0, "UEFI runtime start" },
{ EFI_RUNTIME_MAP_END, "UEFI runtime end" },
{ -1, NULL }
},
.base_addr = 0,
};
static int __init ptdump_init(void)
{
if (efi_enabled(EFI_RUNTIME_SERVICES))
ptdump_debugfs_register(&efi_ptdump_info, "efi_page_tables");
return 0;
}
device_initcall(ptdump_init);
#endif
static bool __init efi_virtmap_init(void)
{
efi_memory_desc_t *md;
efi_mm.pgd = pgd_alloc(&efi_mm);
mm_init_cpumask(&efi_mm);
init_new_context(NULL, &efi_mm);
for_each_efi_memory_desc(md) {
phys_addr_t phys = md->phys_addr;
int ret;
if (!(md->attribute & EFI_MEMORY_RUNTIME))
continue;
if (md->virt_addr == U64_MAX)
return false;
ret = efi_create_mapping(&efi_mm, md);
if (ret) {
pr_warn(" EFI remap %pa: failed to create mapping (%d)\n",
&phys, ret);
return false;
}
}
if (efi_memattr_apply_permissions(&efi_mm, efi_set_mapping_permissions))
return false;
return true;
}
/*
* Enable the UEFI Runtime Services if all prerequisites are in place, i.e.,
* non-early mapping of the UEFI system table and virtual mappings for all
* EFI_MEMORY_RUNTIME regions.
*/
static int __init arm_enable_runtime_services(void)
{
u64 mapsize;
if (!efi_enabled(EFI_BOOT)) {
pr_info("EFI services will not be available.\n");
return 0;
}
efi_memmap_unmap();
mapsize = efi.memmap.desc_size * efi.memmap.nr_map;
if (efi_memmap_init_late(efi.memmap.phys_map, mapsize)) {
pr_err("Failed to remap EFI memory map\n");
return 0;
}
if (efi_soft_reserve_enabled()) {
efi_memory_desc_t *md;
for_each_efi_memory_desc(md) {
int md_size = md->num_pages << EFI_PAGE_SHIFT;
struct resource *res;
if (!(md->attribute & EFI_MEMORY_SP))
continue;
res = kzalloc(sizeof(*res), GFP_KERNEL);
if (WARN_ON(!res))
break;
res->start = md->phys_addr;
res->end = md->phys_addr + md_size - 1;
res->name = "Soft Reserved";
res->flags = IORESOURCE_MEM;
res->desc = IORES_DESC_SOFT_RESERVED;
insert_resource(&iomem_resource, res);
}
}
if (efi_runtime_disabled()) {
pr_info("EFI runtime services will be disabled.\n");
return 0;
}
if (efi_enabled(EFI_RUNTIME_SERVICES)) {
pr_info("EFI runtime services access via paravirt.\n");
return 0;
}
pr_info("Remapping and enabling EFI services.\n");
if (!efi_virtmap_init()) {
pr_err("UEFI virtual mapping missing or invalid -- runtime services will not be available\n");
return -ENOMEM;
}
/* Set up runtime services function pointers */
efi_native_runtime_setup();
set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
return 0;
}
early_initcall(arm_enable_runtime_services);
void efi_virtmap_load(void)
{
preempt_disable();
efi_set_pgd(&efi_mm);
}
void efi_virtmap_unload(void)
{
efi_set_pgd(current->active_mm);
preempt_enable();
}
static int __init arm_dmi_init(void)
{
/*
* On arm64/ARM, DMI depends on UEFI, and dmi_setup() needs to
* be called early because dmi_id_init(), which is an arch_initcall
* itself, depends on dmi_scan_machine() having been called already.
*/
dmi_setup();
return 0;
}
core_initcall(arm_dmi_init);
| linux-master | drivers/firmware/efi/arm-runtime.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2016 Linaro Ltd. <[email protected]>
*/
#define pr_fmt(fmt) "efi: memattr: " fmt
#include <linux/efi.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/memblock.h>
#include <asm/early_ioremap.h>
static int __initdata tbl_size;
unsigned long __ro_after_init efi_mem_attr_table = EFI_INVALID_TABLE_ADDR;
/*
* Reserve the memory associated with the Memory Attributes configuration
* table, if it exists.
*/
int __init efi_memattr_init(void)
{
efi_memory_attributes_table_t *tbl;
if (efi_mem_attr_table == EFI_INVALID_TABLE_ADDR)
return 0;
tbl = early_memremap(efi_mem_attr_table, sizeof(*tbl));
if (!tbl) {
pr_err("Failed to map EFI Memory Attributes table @ 0x%lx\n",
efi_mem_attr_table);
return -ENOMEM;
}
if (tbl->version > 2) {
pr_warn("Unexpected EFI Memory Attributes table version %d\n",
tbl->version);
goto unmap;
}
tbl_size = sizeof(*tbl) + tbl->num_entries * tbl->desc_size;
memblock_reserve(efi_mem_attr_table, tbl_size);
set_bit(EFI_MEM_ATTR, &efi.flags);
unmap:
early_memunmap(tbl, sizeof(*tbl));
return 0;
}
/*
* Returns a copy @out of the UEFI memory descriptor @in if it is covered
* entirely by a UEFI memory map entry with matching attributes. The virtual
* address of @out is set according to the matching entry that was found.
*/
static bool entry_is_valid(const efi_memory_desc_t *in, efi_memory_desc_t *out)
{
u64 in_paddr = in->phys_addr;
u64 in_size = in->num_pages << EFI_PAGE_SHIFT;
efi_memory_desc_t *md;
*out = *in;
if (in->type != EFI_RUNTIME_SERVICES_CODE &&
in->type != EFI_RUNTIME_SERVICES_DATA) {
pr_warn("Entry type should be RuntimeServiceCode/Data\n");
return false;
}
if (PAGE_SIZE > EFI_PAGE_SIZE &&
(!PAGE_ALIGNED(in->phys_addr) ||
!PAGE_ALIGNED(in->num_pages << EFI_PAGE_SHIFT))) {
/*
* Since arm64 may execute with page sizes of up to 64 KB, the
* UEFI spec mandates that RuntimeServices memory regions must
* be 64 KB aligned. We need to validate this here since we will
* not be able to tighten permissions on such regions without
* affecting adjacent regions.
*/
pr_warn("Entry address region misaligned\n");
return false;
}
for_each_efi_memory_desc(md) {
u64 md_paddr = md->phys_addr;
u64 md_size = md->num_pages << EFI_PAGE_SHIFT;
if (!(md->attribute & EFI_MEMORY_RUNTIME))
continue;
if (md->virt_addr == 0 && md->phys_addr != 0) {
/* no virtual mapping has been installed by the stub */
break;
}
if (md_paddr > in_paddr || (in_paddr - md_paddr) >= md_size)
continue;
/*
* This entry covers the start of @in, check whether
* it covers the end as well.
*/
if (md_paddr + md_size < in_paddr + in_size) {
pr_warn("Entry covers multiple EFI memory map regions\n");
return false;
}
if (md->type != in->type) {
pr_warn("Entry type deviates from EFI memory map region type\n");
return false;
}
out->virt_addr = in_paddr + (md->virt_addr - md_paddr);
return true;
}
pr_warn("No matching entry found in the EFI memory map\n");
return false;
}
/*
* To be called after the EFI page tables have been populated. If a memory
* attributes table is available, its contents will be used to update the
* mappings with tightened permissions as described by the table.
* This requires the UEFI memory map to have already been populated with
* virtual addresses.
*/
int __init efi_memattr_apply_permissions(struct mm_struct *mm,
efi_memattr_perm_setter fn)
{
efi_memory_attributes_table_t *tbl;
bool has_bti = false;
int i, ret;
if (tbl_size <= sizeof(*tbl))
return 0;
/*
* We need the EFI memory map to be setup so we can use it to
* lookup the virtual addresses of all entries in the of EFI
* Memory Attributes table. If it isn't available, this
* function should not be called.
*/
if (WARN_ON(!efi_enabled(EFI_MEMMAP)))
return 0;
tbl = memremap(efi_mem_attr_table, tbl_size, MEMREMAP_WB);
if (!tbl) {
pr_err("Failed to map EFI Memory Attributes table @ 0x%lx\n",
efi_mem_attr_table);
return -ENOMEM;
}
if (tbl->version > 1 &&
(tbl->flags & EFI_MEMORY_ATTRIBUTES_FLAGS_RT_FORWARD_CONTROL_FLOW_GUARD))
has_bti = true;
if (efi_enabled(EFI_DBG))
pr_info("Processing EFI Memory Attributes table:\n");
for (i = ret = 0; ret == 0 && i < tbl->num_entries; i++) {
efi_memory_desc_t md;
unsigned long size;
bool valid;
char buf[64];
valid = entry_is_valid((void *)tbl->entry + i * tbl->desc_size,
&md);
size = md.num_pages << EFI_PAGE_SHIFT;
if (efi_enabled(EFI_DBG) || !valid)
pr_info("%s 0x%012llx-0x%012llx %s\n",
valid ? "" : "!", md.phys_addr,
md.phys_addr + size - 1,
efi_md_typeattr_format(buf, sizeof(buf), &md));
if (valid) {
ret = fn(mm, &md, has_bti);
if (ret)
pr_err("Error updating mappings, skipping subsequent md's\n");
}
}
memunmap(tbl);
return ret;
}
| linux-master | drivers/firmware/efi/memattr.c |
// SPDX-License-Identifier: GPL-2.0+
/*
* esrt.c
*
* This module exports EFI System Resource Table (ESRT) entries into userspace
* through the sysfs file system. The ESRT provides a read-only catalog of
* system components for which the system accepts firmware upgrades via UEFI's
* "Capsule Update" feature. This module allows userland utilities to evaluate
* what firmware updates can be applied to this system, and potentially arrange
* for those updates to occur.
*
* Data is currently found below /sys/firmware/efi/esrt/...
*/
#define pr_fmt(fmt) "esrt: " fmt
#include <linux/capability.h>
#include <linux/device.h>
#include <linux/efi.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/kobject.h>
#include <linux/list.h>
#include <linux/memblock.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <asm/io.h>
#include <asm/early_ioremap.h>
struct efi_system_resource_entry_v1 {
efi_guid_t fw_class;
u32 fw_type;
u32 fw_version;
u32 lowest_supported_fw_version;
u32 capsule_flags;
u32 last_attempt_version;
u32 last_attempt_status;
};
/*
* _count and _version are what they seem like. _max is actually just
* accounting info for the firmware when creating the table; it should never
* have been exposed to us. To wit, the spec says:
* The maximum number of resource array entries that can be within the
* table without reallocating the table, must not be zero.
* Since there's no guidance about what that means in terms of memory layout,
* it means nothing to us.
*/
struct efi_system_resource_table {
u32 fw_resource_count;
u32 fw_resource_count_max;
u64 fw_resource_version;
u8 entries[];
};
static phys_addr_t esrt_data;
static size_t esrt_data_size;
static struct efi_system_resource_table *esrt;
struct esre_entry {
union {
struct efi_system_resource_entry_v1 *esre1;
} esre;
struct kobject kobj;
struct list_head list;
};
/* global list of esre_entry. */
static LIST_HEAD(entry_list);
/* entry attribute */
struct esre_attribute {
struct attribute attr;
ssize_t (*show)(struct esre_entry *entry, char *buf);
ssize_t (*store)(struct esre_entry *entry,
const char *buf, size_t count);
};
static struct esre_entry *to_entry(struct kobject *kobj)
{
return container_of(kobj, struct esre_entry, kobj);
}
static struct esre_attribute *to_attr(struct attribute *attr)
{
return container_of(attr, struct esre_attribute, attr);
}
static ssize_t esre_attr_show(struct kobject *kobj,
struct attribute *_attr, char *buf)
{
struct esre_entry *entry = to_entry(kobj);
struct esre_attribute *attr = to_attr(_attr);
return attr->show(entry, buf);
}
static const struct sysfs_ops esre_attr_ops = {
.show = esre_attr_show,
};
/* Generic ESRT Entry ("ESRE") support. */
static ssize_t fw_class_show(struct esre_entry *entry, char *buf)
{
char *str = buf;
efi_guid_to_str(&entry->esre.esre1->fw_class, str);
str += strlen(str);
str += sprintf(str, "\n");
return str - buf;
}
static struct esre_attribute esre_fw_class = __ATTR_RO_MODE(fw_class, 0400);
#define esre_attr_decl(name, size, fmt) \
static ssize_t name##_show(struct esre_entry *entry, char *buf) \
{ \
return sprintf(buf, fmt "\n", \
le##size##_to_cpu(entry->esre.esre1->name)); \
} \
\
static struct esre_attribute esre_##name = __ATTR_RO_MODE(name, 0400)
esre_attr_decl(fw_type, 32, "%u");
esre_attr_decl(fw_version, 32, "%u");
esre_attr_decl(lowest_supported_fw_version, 32, "%u");
esre_attr_decl(capsule_flags, 32, "0x%x");
esre_attr_decl(last_attempt_version, 32, "%u");
esre_attr_decl(last_attempt_status, 32, "%u");
static struct attribute *esre1_attrs[] = {
&esre_fw_class.attr,
&esre_fw_type.attr,
&esre_fw_version.attr,
&esre_lowest_supported_fw_version.attr,
&esre_capsule_flags.attr,
&esre_last_attempt_version.attr,
&esre_last_attempt_status.attr,
NULL
};
ATTRIBUTE_GROUPS(esre1);
static void esre_release(struct kobject *kobj)
{
struct esre_entry *entry = to_entry(kobj);
list_del(&entry->list);
kfree(entry);
}
static const struct kobj_type esre1_ktype = {
.release = esre_release,
.sysfs_ops = &esre_attr_ops,
.default_groups = esre1_groups,
};
static struct kobject *esrt_kobj;
static struct kset *esrt_kset;
static int esre_create_sysfs_entry(void *esre, int entry_num)
{
struct esre_entry *entry;
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return -ENOMEM;
entry->kobj.kset = esrt_kset;
if (esrt->fw_resource_version == 1) {
int rc = 0;
entry->esre.esre1 = esre;
rc = kobject_init_and_add(&entry->kobj, &esre1_ktype, NULL,
"entry%d", entry_num);
if (rc) {
kobject_put(&entry->kobj);
return rc;
}
}
list_add_tail(&entry->list, &entry_list);
return 0;
}
/* support for displaying ESRT fields at the top level */
#define esrt_attr_decl(name, size, fmt) \
static ssize_t name##_show(struct kobject *kobj, \
struct kobj_attribute *attr, char *buf)\
{ \
return sprintf(buf, fmt "\n", le##size##_to_cpu(esrt->name)); \
} \
\
static struct kobj_attribute esrt_##name = __ATTR_RO_MODE(name, 0400)
esrt_attr_decl(fw_resource_count, 32, "%u");
esrt_attr_decl(fw_resource_count_max, 32, "%u");
esrt_attr_decl(fw_resource_version, 64, "%llu");
static struct attribute *esrt_attrs[] = {
&esrt_fw_resource_count.attr,
&esrt_fw_resource_count_max.attr,
&esrt_fw_resource_version.attr,
NULL,
};
static inline int esrt_table_exists(void)
{
if (!efi_enabled(EFI_CONFIG_TABLES))
return 0;
if (efi.esrt == EFI_INVALID_TABLE_ADDR)
return 0;
return 1;
}
static umode_t esrt_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
if (!esrt_table_exists())
return 0;
return attr->mode;
}
static const struct attribute_group esrt_attr_group = {
.attrs = esrt_attrs,
.is_visible = esrt_attr_is_visible,
};
/*
* remap the table, validate it, mark it reserved and unmap it.
*/
void __init efi_esrt_init(void)
{
void *va;
struct efi_system_resource_table tmpesrt;
size_t size, max, entry_size, entries_size;
efi_memory_desc_t md;
int rc;
phys_addr_t end;
if (!efi_enabled(EFI_MEMMAP) && !efi_enabled(EFI_PARAVIRT))
return;
pr_debug("esrt-init: loading.\n");
if (!esrt_table_exists())
return;
rc = efi_mem_desc_lookup(efi.esrt, &md);
if (rc < 0 ||
(!(md.attribute & EFI_MEMORY_RUNTIME) &&
md.type != EFI_BOOT_SERVICES_DATA &&
md.type != EFI_RUNTIME_SERVICES_DATA &&
md.type != EFI_ACPI_RECLAIM_MEMORY &&
md.type != EFI_ACPI_MEMORY_NVS)) {
pr_warn("ESRT header is not in the memory map.\n");
return;
}
max = efi_mem_desc_end(&md) - efi.esrt;
size = sizeof(*esrt);
if (max < size) {
pr_err("ESRT header doesn't fit on single memory map entry. (size: %zu max: %zu)\n",
size, max);
return;
}
va = early_memremap(efi.esrt, size);
if (!va) {
pr_err("early_memremap(%p, %zu) failed.\n", (void *)efi.esrt,
size);
return;
}
memcpy(&tmpesrt, va, sizeof(tmpesrt));
early_memunmap(va, size);
if (tmpesrt.fw_resource_version != 1) {
pr_err("Unsupported ESRT version %lld.\n",
tmpesrt.fw_resource_version);
return;
}
entry_size = sizeof(struct efi_system_resource_entry_v1);
if (tmpesrt.fw_resource_count > 0 && max - size < entry_size) {
pr_err("ESRT memory map entry can only hold the header. (max: %zu size: %zu)\n",
max - size, entry_size);
return;
}
/*
* The format doesn't really give us any boundary to test here,
* so I'm making up 128 as the max number of individually updatable
* components we support.
* 128 should be pretty excessive, but there's still some chance
* somebody will do that someday and we'll need to raise this.
*/
if (tmpesrt.fw_resource_count > 128) {
pr_err("ESRT says fw_resource_count has very large value %d.\n",
tmpesrt.fw_resource_count);
return;
}
/*
* We know it can't be larger than N * sizeof() here, and N is limited
* by the previous test to a small number, so there's no overflow.
*/
entries_size = tmpesrt.fw_resource_count * entry_size;
if (max < size + entries_size) {
pr_err("ESRT does not fit on single memory map entry (size: %zu max: %zu)\n",
size, max);
return;
}
size += entries_size;
esrt_data = (phys_addr_t)efi.esrt;
esrt_data_size = size;
end = esrt_data + size;
pr_info("Reserving ESRT space from %pa to %pa.\n", &esrt_data, &end);
if (md.type == EFI_BOOT_SERVICES_DATA)
efi_mem_reserve(esrt_data, esrt_data_size);
pr_debug("esrt-init: loaded.\n");
}
static int __init register_entries(void)
{
struct efi_system_resource_entry_v1 *v1_entries = (void *)esrt->entries;
int i, rc;
if (!esrt_table_exists())
return 0;
for (i = 0; i < le32_to_cpu(esrt->fw_resource_count); i++) {
void *esre = NULL;
if (esrt->fw_resource_version == 1) {
esre = &v1_entries[i];
} else {
pr_err("Unsupported ESRT version %lld.\n",
esrt->fw_resource_version);
return -EINVAL;
}
rc = esre_create_sysfs_entry(esre, i);
if (rc < 0) {
pr_err("ESRT entry creation failed with error %d.\n",
rc);
return rc;
}
}
return 0;
}
static void cleanup_entry_list(void)
{
struct esre_entry *entry, *next;
list_for_each_entry_safe(entry, next, &entry_list, list) {
kobject_put(&entry->kobj);
}
}
static int __init esrt_sysfs_init(void)
{
int error;
pr_debug("esrt-sysfs: loading.\n");
if (!esrt_data || !esrt_data_size)
return -ENOSYS;
esrt = memremap(esrt_data, esrt_data_size, MEMREMAP_WB);
if (!esrt) {
pr_err("memremap(%pa, %zu) failed.\n", &esrt_data,
esrt_data_size);
return -ENOMEM;
}
esrt_kobj = kobject_create_and_add("esrt", efi_kobj);
if (!esrt_kobj) {
pr_err("Firmware table registration failed.\n");
error = -ENOMEM;
goto err;
}
error = sysfs_create_group(esrt_kobj, &esrt_attr_group);
if (error) {
pr_err("Sysfs attribute export failed with error %d.\n",
error);
goto err_remove_esrt;
}
esrt_kset = kset_create_and_add("entries", NULL, esrt_kobj);
if (!esrt_kset) {
pr_err("kset creation failed.\n");
error = -ENOMEM;
goto err_remove_group;
}
error = register_entries();
if (error)
goto err_cleanup_list;
pr_debug("esrt-sysfs: loaded.\n");
return 0;
err_cleanup_list:
cleanup_entry_list();
kset_unregister(esrt_kset);
err_remove_group:
sysfs_remove_group(esrt_kobj, &esrt_attr_group);
err_remove_esrt:
kobject_put(esrt_kobj);
err:
memunmap(esrt);
esrt = NULL;
return error;
}
device_initcall(esrt_sysfs_init);
/*
MODULE_AUTHOR("Peter Jones <[email protected]>");
MODULE_DESCRIPTION("EFI System Resource Table support");
MODULE_LICENSE("GPL");
*/
| linux-master | drivers/firmware/efi/esrt.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2014 Intel Corporation; author Matt Fleming
* Copyright (c) 2014 Red Hat, Inc., Mark Salter <[email protected]>
*/
#include <linux/efi.h>
#include <linux/reboot.h>
static struct sys_off_handler *efi_sys_off_handler;
int efi_reboot_quirk_mode = -1;
void efi_reboot(enum reboot_mode reboot_mode, const char *__unused)
{
const char *str[] = { "cold", "warm", "shutdown", "platform" };
int efi_mode, cap_reset_mode;
if (!efi_rt_services_supported(EFI_RT_SUPPORTED_RESET_SYSTEM))
return;
switch (reboot_mode) {
case REBOOT_WARM:
case REBOOT_SOFT:
efi_mode = EFI_RESET_WARM;
break;
default:
efi_mode = EFI_RESET_COLD;
break;
}
/*
* If a quirk forced an EFI reset mode, always use that.
*/
if (efi_reboot_quirk_mode != -1)
efi_mode = efi_reboot_quirk_mode;
if (efi_capsule_pending(&cap_reset_mode)) {
if (efi_mode != cap_reset_mode)
printk(KERN_CRIT "efi: %s reset requested but pending "
"capsule update requires %s reset... Performing "
"%s reset.\n", str[efi_mode], str[cap_reset_mode],
str[cap_reset_mode]);
efi_mode = cap_reset_mode;
}
efi.reset_system(efi_mode, EFI_SUCCESS, 0, NULL);
}
bool __weak efi_poweroff_required(void)
{
return false;
}
static int efi_power_off(struct sys_off_data *data)
{
efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL);
return NOTIFY_DONE;
}
static int __init efi_shutdown_init(void)
{
if (!efi_rt_services_supported(EFI_RT_SUPPORTED_RESET_SYSTEM))
return -ENODEV;
if (efi_poweroff_required()) {
/* SYS_OFF_PRIO_FIRMWARE + 1 so that it runs before acpi_power_off */
efi_sys_off_handler =
register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
SYS_OFF_PRIO_FIRMWARE + 1,
efi_power_off, NULL);
if (IS_ERR(efi_sys_off_handler))
return PTR_ERR(efi_sys_off_handler);
}
return 0;
}
late_initcall(efi_shutdown_init);
| linux-master | drivers/firmware/efi/reboot.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* efi.c - EFI subsystem
*
* Copyright (C) 2001,2003,2004 Dell <[email protected]>
* Copyright (C) 2004 Intel Corporation <[email protected]>
* Copyright (C) 2013 Tom Gundersen <[email protected]>
*
* This code registers /sys/firmware/efi{,/efivars} when EFI is supported,
* allowing the efivarfs to be mounted or the efivars module to be loaded.
* The existance of /sys/firmware/efi may also be used by userspace to
* determine that the system supports EFI.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kobject.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/efi.h>
#include <linux/of.h>
#include <linux/initrd.h>
#include <linux/io.h>
#include <linux/kexec.h>
#include <linux/platform_device.h>
#include <linux/random.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/ucs2_string.h>
#include <linux/memblock.h>
#include <linux/security.h>
#include <asm/early_ioremap.h>
struct efi __read_mostly efi = {
.runtime_supported_mask = EFI_RT_SUPPORTED_ALL,
.acpi = EFI_INVALID_TABLE_ADDR,
.acpi20 = EFI_INVALID_TABLE_ADDR,
.smbios = EFI_INVALID_TABLE_ADDR,
.smbios3 = EFI_INVALID_TABLE_ADDR,
.esrt = EFI_INVALID_TABLE_ADDR,
.tpm_log = EFI_INVALID_TABLE_ADDR,
.tpm_final_log = EFI_INVALID_TABLE_ADDR,
#ifdef CONFIG_LOAD_UEFI_KEYS
.mokvar_table = EFI_INVALID_TABLE_ADDR,
#endif
#ifdef CONFIG_EFI_COCO_SECRET
.coco_secret = EFI_INVALID_TABLE_ADDR,
#endif
#ifdef CONFIG_UNACCEPTED_MEMORY
.unaccepted = EFI_INVALID_TABLE_ADDR,
#endif
};
EXPORT_SYMBOL(efi);
unsigned long __ro_after_init efi_rng_seed = EFI_INVALID_TABLE_ADDR;
static unsigned long __initdata mem_reserve = EFI_INVALID_TABLE_ADDR;
static unsigned long __initdata rt_prop = EFI_INVALID_TABLE_ADDR;
static unsigned long __initdata initrd = EFI_INVALID_TABLE_ADDR;
extern unsigned long screen_info_table;
struct mm_struct efi_mm = {
.mm_mt = MTREE_INIT_EXT(mm_mt, MM_MT_FLAGS, efi_mm.mmap_lock),
.mm_users = ATOMIC_INIT(2),
.mm_count = ATOMIC_INIT(1),
.write_protect_seq = SEQCNT_ZERO(efi_mm.write_protect_seq),
MMAP_LOCK_INITIALIZER(efi_mm)
.page_table_lock = __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock),
.mmlist = LIST_HEAD_INIT(efi_mm.mmlist),
.cpu_bitmap = { [BITS_TO_LONGS(NR_CPUS)] = 0},
};
struct workqueue_struct *efi_rts_wq;
static bool disable_runtime = IS_ENABLED(CONFIG_EFI_DISABLE_RUNTIME);
static int __init setup_noefi(char *arg)
{
disable_runtime = true;
return 0;
}
early_param("noefi", setup_noefi);
bool efi_runtime_disabled(void)
{
return disable_runtime;
}
bool __pure __efi_soft_reserve_enabled(void)
{
return !efi_enabled(EFI_MEM_NO_SOFT_RESERVE);
}
static int __init parse_efi_cmdline(char *str)
{
if (!str) {
pr_warn("need at least one option\n");
return -EINVAL;
}
if (parse_option_str(str, "debug"))
set_bit(EFI_DBG, &efi.flags);
if (parse_option_str(str, "noruntime"))
disable_runtime = true;
if (parse_option_str(str, "runtime"))
disable_runtime = false;
if (parse_option_str(str, "nosoftreserve"))
set_bit(EFI_MEM_NO_SOFT_RESERVE, &efi.flags);
return 0;
}
early_param("efi", parse_efi_cmdline);
struct kobject *efi_kobj;
/*
* Let's not leave out systab information that snuck into
* the efivars driver
* Note, do not add more fields in systab sysfs file as it breaks sysfs
* one value per file rule!
*/
static ssize_t systab_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
char *str = buf;
if (!kobj || !buf)
return -EINVAL;
if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20);
if (efi.acpi != EFI_INVALID_TABLE_ADDR)
str += sprintf(str, "ACPI=0x%lx\n", efi.acpi);
/*
* If both SMBIOS and SMBIOS3 entry points are implemented, the
* SMBIOS3 entry point shall be preferred, so we list it first to
* let applications stop parsing after the first match.
*/
if (efi.smbios3 != EFI_INVALID_TABLE_ADDR)
str += sprintf(str, "SMBIOS3=0x%lx\n", efi.smbios3);
if (efi.smbios != EFI_INVALID_TABLE_ADDR)
str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios);
if (IS_ENABLED(CONFIG_IA64) || IS_ENABLED(CONFIG_X86))
str = efi_systab_show_arch(str);
return str - buf;
}
static struct kobj_attribute efi_attr_systab = __ATTR_RO_MODE(systab, 0400);
static ssize_t fw_platform_size_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", efi_enabled(EFI_64BIT) ? 64 : 32);
}
extern __weak struct kobj_attribute efi_attr_fw_vendor;
extern __weak struct kobj_attribute efi_attr_runtime;
extern __weak struct kobj_attribute efi_attr_config_table;
static struct kobj_attribute efi_attr_fw_platform_size =
__ATTR_RO(fw_platform_size);
static struct attribute *efi_subsys_attrs[] = {
&efi_attr_systab.attr,
&efi_attr_fw_platform_size.attr,
&efi_attr_fw_vendor.attr,
&efi_attr_runtime.attr,
&efi_attr_config_table.attr,
NULL,
};
umode_t __weak efi_attr_is_visible(struct kobject *kobj, struct attribute *attr,
int n)
{
return attr->mode;
}
static const struct attribute_group efi_subsys_attr_group = {
.attrs = efi_subsys_attrs,
.is_visible = efi_attr_is_visible,
};
static struct efivars generic_efivars;
static struct efivar_operations generic_ops;
static bool generic_ops_supported(void)
{
unsigned long name_size;
efi_status_t status;
efi_char16_t name;
efi_guid_t guid;
name_size = sizeof(name);
status = efi.get_next_variable(&name_size, &name, &guid);
if (status == EFI_UNSUPPORTED)
return false;
return true;
}
static int generic_ops_register(void)
{
if (!generic_ops_supported())
return 0;
generic_ops.get_variable = efi.get_variable;
generic_ops.get_next_variable = efi.get_next_variable;
generic_ops.query_variable_store = efi_query_variable_store;
generic_ops.query_variable_info = efi.query_variable_info;
if (efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE)) {
generic_ops.set_variable = efi.set_variable;
generic_ops.set_variable_nonblocking = efi.set_variable_nonblocking;
}
return efivars_register(&generic_efivars, &generic_ops);
}
static void generic_ops_unregister(void)
{
if (!generic_ops.get_variable)
return;
efivars_unregister(&generic_efivars);
}
#ifdef CONFIG_EFI_CUSTOM_SSDT_OVERLAYS
#define EFIVAR_SSDT_NAME_MAX 16UL
static char efivar_ssdt[EFIVAR_SSDT_NAME_MAX] __initdata;
static int __init efivar_ssdt_setup(char *str)
{
int ret = security_locked_down(LOCKDOWN_ACPI_TABLES);
if (ret)
return ret;
if (strlen(str) < sizeof(efivar_ssdt))
memcpy(efivar_ssdt, str, strlen(str));
else
pr_warn("efivar_ssdt: name too long: %s\n", str);
return 1;
}
__setup("efivar_ssdt=", efivar_ssdt_setup);
static __init int efivar_ssdt_load(void)
{
unsigned long name_size = 256;
efi_char16_t *name = NULL;
efi_status_t status;
efi_guid_t guid;
if (!efivar_ssdt[0])
return 0;
name = kzalloc(name_size, GFP_KERNEL);
if (!name)
return -ENOMEM;
for (;;) {
char utf8_name[EFIVAR_SSDT_NAME_MAX];
unsigned long data_size = 0;
void *data;
int limit;
status = efi.get_next_variable(&name_size, name, &guid);
if (status == EFI_NOT_FOUND) {
break;
} else if (status == EFI_BUFFER_TOO_SMALL) {
name = krealloc(name, name_size, GFP_KERNEL);
if (!name)
return -ENOMEM;
continue;
}
limit = min(EFIVAR_SSDT_NAME_MAX, name_size);
ucs2_as_utf8(utf8_name, name, limit - 1);
if (strncmp(utf8_name, efivar_ssdt, limit) != 0)
continue;
pr_info("loading SSDT from variable %s-%pUl\n", efivar_ssdt, &guid);
status = efi.get_variable(name, &guid, NULL, &data_size, NULL);
if (status != EFI_BUFFER_TOO_SMALL || !data_size)
return -EIO;
data = kmalloc(data_size, GFP_KERNEL);
if (!data)
return -ENOMEM;
status = efi.get_variable(name, &guid, NULL, &data_size, data);
if (status == EFI_SUCCESS) {
acpi_status ret = acpi_load_table(data, NULL);
if (ret)
pr_err("failed to load table: %u\n", ret);
else
continue;
} else {
pr_err("failed to get var data: 0x%lx\n", status);
}
kfree(data);
}
return 0;
}
#else
static inline int efivar_ssdt_load(void) { return 0; }
#endif
#ifdef CONFIG_DEBUG_FS
#define EFI_DEBUGFS_MAX_BLOBS 32
static struct debugfs_blob_wrapper debugfs_blob[EFI_DEBUGFS_MAX_BLOBS];
static void __init efi_debugfs_init(void)
{
struct dentry *efi_debugfs;
efi_memory_desc_t *md;
char name[32];
int type_count[EFI_BOOT_SERVICES_DATA + 1] = {};
int i = 0;
efi_debugfs = debugfs_create_dir("efi", NULL);
if (IS_ERR_OR_NULL(efi_debugfs))
return;
for_each_efi_memory_desc(md) {
switch (md->type) {
case EFI_BOOT_SERVICES_CODE:
snprintf(name, sizeof(name), "boot_services_code%d",
type_count[md->type]++);
break;
case EFI_BOOT_SERVICES_DATA:
snprintf(name, sizeof(name), "boot_services_data%d",
type_count[md->type]++);
break;
default:
continue;
}
if (i >= EFI_DEBUGFS_MAX_BLOBS) {
pr_warn("More then %d EFI boot service segments, only showing first %d in debugfs\n",
EFI_DEBUGFS_MAX_BLOBS, EFI_DEBUGFS_MAX_BLOBS);
break;
}
debugfs_blob[i].size = md->num_pages << EFI_PAGE_SHIFT;
debugfs_blob[i].data = memremap(md->phys_addr,
debugfs_blob[i].size,
MEMREMAP_WB);
if (!debugfs_blob[i].data)
continue;
debugfs_create_blob(name, 0400, efi_debugfs, &debugfs_blob[i]);
i++;
}
}
#else
static inline void efi_debugfs_init(void) {}
#endif
/*
* We register the efi subsystem with the firmware subsystem and the
* efivars subsystem with the efi subsystem, if the system was booted with
* EFI.
*/
static int __init efisubsys_init(void)
{
int error;
if (!efi_enabled(EFI_RUNTIME_SERVICES))
efi.runtime_supported_mask = 0;
if (!efi_enabled(EFI_BOOT))
return 0;
if (efi.runtime_supported_mask) {
/*
* Since we process only one efi_runtime_service() at a time, an
* ordered workqueue (which creates only one execution context)
* should suffice for all our needs.
*/
efi_rts_wq = alloc_ordered_workqueue("efi_rts_wq", 0);
if (!efi_rts_wq) {
pr_err("Creating efi_rts_wq failed, EFI runtime services disabled.\n");
clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
efi.runtime_supported_mask = 0;
return 0;
}
}
if (efi_rt_services_supported(EFI_RT_SUPPORTED_TIME_SERVICES))
platform_device_register_simple("rtc-efi", 0, NULL, 0);
/* We register the efi directory at /sys/firmware/efi */
efi_kobj = kobject_create_and_add("efi", firmware_kobj);
if (!efi_kobj) {
pr_err("efi: Firmware registration failed.\n");
error = -ENOMEM;
goto err_destroy_wq;
}
if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE |
EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME)) {
error = generic_ops_register();
if (error)
goto err_put;
efivar_ssdt_load();
platform_device_register_simple("efivars", 0, NULL, 0);
}
error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
if (error) {
pr_err("efi: Sysfs attribute export failed with error %d.\n",
error);
goto err_unregister;
}
/* and the standard mountpoint for efivarfs */
error = sysfs_create_mount_point(efi_kobj, "efivars");
if (error) {
pr_err("efivars: Subsystem registration failed.\n");
goto err_remove_group;
}
if (efi_enabled(EFI_DBG) && efi_enabled(EFI_PRESERVE_BS_REGIONS))
efi_debugfs_init();
#ifdef CONFIG_EFI_COCO_SECRET
if (efi.coco_secret != EFI_INVALID_TABLE_ADDR)
platform_device_register_simple("efi_secret", 0, NULL, 0);
#endif
return 0;
err_remove_group:
sysfs_remove_group(efi_kobj, &efi_subsys_attr_group);
err_unregister:
if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE |
EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME))
generic_ops_unregister();
err_put:
kobject_put(efi_kobj);
efi_kobj = NULL;
err_destroy_wq:
if (efi_rts_wq)
destroy_workqueue(efi_rts_wq);
return error;
}
subsys_initcall(efisubsys_init);
void __init efi_find_mirror(void)
{
efi_memory_desc_t *md;
u64 mirror_size = 0, total_size = 0;
if (!efi_enabled(EFI_MEMMAP))
return;
for_each_efi_memory_desc(md) {
unsigned long long start = md->phys_addr;
unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
total_size += size;
if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
memblock_mark_mirror(start, size);
mirror_size += size;
}
}
if (mirror_size)
pr_info("Memory: %lldM/%lldM mirrored memory\n",
mirror_size>>20, total_size>>20);
}
/*
* Find the efi memory descriptor for a given physical address. Given a
* physical address, determine if it exists within an EFI Memory Map entry,
* and if so, populate the supplied memory descriptor with the appropriate
* data.
*/
int __efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
{
efi_memory_desc_t *md;
if (!efi_enabled(EFI_MEMMAP)) {
pr_err_once("EFI_MEMMAP is not enabled.\n");
return -EINVAL;
}
if (!out_md) {
pr_err_once("out_md is null.\n");
return -EINVAL;
}
for_each_efi_memory_desc(md) {
u64 size;
u64 end;
/* skip bogus entries (including empty ones) */
if ((md->phys_addr & (EFI_PAGE_SIZE - 1)) ||
(md->num_pages <= 0) ||
(md->num_pages > (U64_MAX - md->phys_addr) >> EFI_PAGE_SHIFT))
continue;
size = md->num_pages << EFI_PAGE_SHIFT;
end = md->phys_addr + size;
if (phys_addr >= md->phys_addr && phys_addr < end) {
memcpy(out_md, md, sizeof(*out_md));
return 0;
}
}
return -ENOENT;
}
extern int efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
__weak __alias(__efi_mem_desc_lookup);
/*
* Calculate the highest address of an efi memory descriptor.
*/
u64 __init efi_mem_desc_end(efi_memory_desc_t *md)
{
u64 size = md->num_pages << EFI_PAGE_SHIFT;
u64 end = md->phys_addr + size;
return end;
}
void __init __weak efi_arch_mem_reserve(phys_addr_t addr, u64 size) {}
/**
* efi_mem_reserve - Reserve an EFI memory region
* @addr: Physical address to reserve
* @size: Size of reservation
*
* Mark a region as reserved from general kernel allocation and
* prevent it being released by efi_free_boot_services().
*
* This function should be called drivers once they've parsed EFI
* configuration tables to figure out where their data lives, e.g.
* efi_esrt_init().
*/
void __init efi_mem_reserve(phys_addr_t addr, u64 size)
{
/* efi_mem_reserve() does not work under Xen */
if (WARN_ON_ONCE(efi_enabled(EFI_PARAVIRT)))
return;
if (!memblock_is_region_reserved(addr, size))
memblock_reserve(addr, size);
/*
* Some architectures (x86) reserve all boot services ranges
* until efi_free_boot_services() because of buggy firmware
* implementations. This means the above memblock_reserve() is
* superfluous on x86 and instead what it needs to do is
* ensure the @start, @size is not freed.
*/
efi_arch_mem_reserve(addr, size);
}
static const efi_config_table_type_t common_tables[] __initconst = {
{ACPI_20_TABLE_GUID, &efi.acpi20, "ACPI 2.0" },
{ACPI_TABLE_GUID, &efi.acpi, "ACPI" },
{SMBIOS_TABLE_GUID, &efi.smbios, "SMBIOS" },
{SMBIOS3_TABLE_GUID, &efi.smbios3, "SMBIOS 3.0" },
{EFI_SYSTEM_RESOURCE_TABLE_GUID, &efi.esrt, "ESRT" },
{EFI_MEMORY_ATTRIBUTES_TABLE_GUID, &efi_mem_attr_table, "MEMATTR" },
{LINUX_EFI_RANDOM_SEED_TABLE_GUID, &efi_rng_seed, "RNG" },
{LINUX_EFI_TPM_EVENT_LOG_GUID, &efi.tpm_log, "TPMEventLog" },
{LINUX_EFI_TPM_FINAL_LOG_GUID, &efi.tpm_final_log, "TPMFinalLog" },
{LINUX_EFI_MEMRESERVE_TABLE_GUID, &mem_reserve, "MEMRESERVE" },
{LINUX_EFI_INITRD_MEDIA_GUID, &initrd, "INITRD" },
{EFI_RT_PROPERTIES_TABLE_GUID, &rt_prop, "RTPROP" },
#ifdef CONFIG_EFI_RCI2_TABLE
{DELLEMC_EFI_RCI2_TABLE_GUID, &rci2_table_phys },
#endif
#ifdef CONFIG_LOAD_UEFI_KEYS
{LINUX_EFI_MOK_VARIABLE_TABLE_GUID, &efi.mokvar_table, "MOKvar" },
#endif
#ifdef CONFIG_EFI_COCO_SECRET
{LINUX_EFI_COCO_SECRET_AREA_GUID, &efi.coco_secret, "CocoSecret" },
#endif
#ifdef CONFIG_UNACCEPTED_MEMORY
{LINUX_EFI_UNACCEPTED_MEM_TABLE_GUID, &efi.unaccepted, "Unaccepted" },
#endif
#ifdef CONFIG_EFI_GENERIC_STUB
{LINUX_EFI_SCREEN_INFO_TABLE_GUID, &screen_info_table },
#endif
{},
};
static __init int match_config_table(const efi_guid_t *guid,
unsigned long table,
const efi_config_table_type_t *table_types)
{
int i;
for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) {
if (efi_guidcmp(*guid, table_types[i].guid))
continue;
if (!efi_config_table_is_usable(guid, table)) {
if (table_types[i].name[0])
pr_cont("(%s=0x%lx unusable) ",
table_types[i].name, table);
return 1;
}
*(table_types[i].ptr) = table;
if (table_types[i].name[0])
pr_cont("%s=0x%lx ", table_types[i].name, table);
return 1;
}
return 0;
}
/**
* reserve_unaccepted - Map and reserve unaccepted configuration table
* @unaccepted: Pointer to unaccepted memory table
*
* memblock_add() makes sure that the table is mapped in direct mapping. During
* normal boot it happens automatically because the table is allocated from
* usable memory. But during crashkernel boot only memory specifically reserved
* for crash scenario is mapped. memblock_add() forces the table to be mapped
* in crashkernel case.
*
* Align the range to the nearest page borders. Ranges smaller than page size
* are not going to be mapped.
*
* memblock_reserve() makes sure that future allocations will not touch the
* table.
*/
static __init void reserve_unaccepted(struct efi_unaccepted_memory *unaccepted)
{
phys_addr_t start, size;
start = PAGE_ALIGN_DOWN(efi.unaccepted);
size = PAGE_ALIGN(sizeof(*unaccepted) + unaccepted->size);
memblock_add(start, size);
memblock_reserve(start, size);
}
int __init efi_config_parse_tables(const efi_config_table_t *config_tables,
int count,
const efi_config_table_type_t *arch_tables)
{
const efi_config_table_64_t *tbl64 = (void *)config_tables;
const efi_config_table_32_t *tbl32 = (void *)config_tables;
const efi_guid_t *guid;
unsigned long table;
int i;
pr_info("");
for (i = 0; i < count; i++) {
if (!IS_ENABLED(CONFIG_X86)) {
guid = &config_tables[i].guid;
table = (unsigned long)config_tables[i].table;
} else if (efi_enabled(EFI_64BIT)) {
guid = &tbl64[i].guid;
table = tbl64[i].table;
if (IS_ENABLED(CONFIG_X86_32) &&
tbl64[i].table > U32_MAX) {
pr_cont("\n");
pr_err("Table located above 4GB, disabling EFI.\n");
return -EINVAL;
}
} else {
guid = &tbl32[i].guid;
table = tbl32[i].table;
}
if (!match_config_table(guid, table, common_tables) && arch_tables)
match_config_table(guid, table, arch_tables);
}
pr_cont("\n");
set_bit(EFI_CONFIG_TABLES, &efi.flags);
if (efi_rng_seed != EFI_INVALID_TABLE_ADDR) {
struct linux_efi_random_seed *seed;
u32 size = 0;
seed = early_memremap(efi_rng_seed, sizeof(*seed));
if (seed != NULL) {
size = min_t(u32, seed->size, SZ_1K); // sanity check
early_memunmap(seed, sizeof(*seed));
} else {
pr_err("Could not map UEFI random seed!\n");
}
if (size > 0) {
seed = early_memremap(efi_rng_seed,
sizeof(*seed) + size);
if (seed != NULL) {
add_bootloader_randomness(seed->bits, size);
memzero_explicit(seed->bits, size);
early_memunmap(seed, sizeof(*seed) + size);
} else {
pr_err("Could not map UEFI random seed!\n");
}
}
}
if (!IS_ENABLED(CONFIG_X86_32) && efi_enabled(EFI_MEMMAP))
efi_memattr_init();
efi_tpm_eventlog_init();
if (mem_reserve != EFI_INVALID_TABLE_ADDR) {
unsigned long prsv = mem_reserve;
while (prsv) {
struct linux_efi_memreserve *rsv;
u8 *p;
/*
* Just map a full page: that is what we will get
* anyway, and it permits us to map the entire entry
* before knowing its size.
*/
p = early_memremap(ALIGN_DOWN(prsv, PAGE_SIZE),
PAGE_SIZE);
if (p == NULL) {
pr_err("Could not map UEFI memreserve entry!\n");
return -ENOMEM;
}
rsv = (void *)(p + prsv % PAGE_SIZE);
/* reserve the entry itself */
memblock_reserve(prsv,
struct_size(rsv, entry, rsv->size));
for (i = 0; i < atomic_read(&rsv->count); i++) {
memblock_reserve(rsv->entry[i].base,
rsv->entry[i].size);
}
prsv = rsv->next;
early_memunmap(p, PAGE_SIZE);
}
}
if (rt_prop != EFI_INVALID_TABLE_ADDR) {
efi_rt_properties_table_t *tbl;
tbl = early_memremap(rt_prop, sizeof(*tbl));
if (tbl) {
efi.runtime_supported_mask &= tbl->runtime_services_supported;
early_memunmap(tbl, sizeof(*tbl));
}
}
if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) &&
initrd != EFI_INVALID_TABLE_ADDR && phys_initrd_size == 0) {
struct linux_efi_initrd *tbl;
tbl = early_memremap(initrd, sizeof(*tbl));
if (tbl) {
phys_initrd_start = tbl->base;
phys_initrd_size = tbl->size;
early_memunmap(tbl, sizeof(*tbl));
}
}
if (IS_ENABLED(CONFIG_UNACCEPTED_MEMORY) &&
efi.unaccepted != EFI_INVALID_TABLE_ADDR) {
struct efi_unaccepted_memory *unaccepted;
unaccepted = early_memremap(efi.unaccepted, sizeof(*unaccepted));
if (unaccepted) {
if (unaccepted->version == 1) {
reserve_unaccepted(unaccepted);
} else {
efi.unaccepted = EFI_INVALID_TABLE_ADDR;
}
early_memunmap(unaccepted, sizeof(*unaccepted));
}
}
return 0;
}
int __init efi_systab_check_header(const efi_table_hdr_t *systab_hdr)
{
if (systab_hdr->signature != EFI_SYSTEM_TABLE_SIGNATURE) {
pr_err("System table signature incorrect!\n");
return -EINVAL;
}
return 0;
}
#ifndef CONFIG_IA64
static const efi_char16_t *__init map_fw_vendor(unsigned long fw_vendor,
size_t size)
{
const efi_char16_t *ret;
ret = early_memremap_ro(fw_vendor, size);
if (!ret)
pr_err("Could not map the firmware vendor!\n");
return ret;
}
static void __init unmap_fw_vendor(const void *fw_vendor, size_t size)
{
early_memunmap((void *)fw_vendor, size);
}
#else
#define map_fw_vendor(p, s) __va(p)
#define unmap_fw_vendor(v, s)
#endif
void __init efi_systab_report_header(const efi_table_hdr_t *systab_hdr,
unsigned long fw_vendor)
{
char vendor[100] = "unknown";
const efi_char16_t *c16;
size_t i;
u16 rev;
c16 = map_fw_vendor(fw_vendor, sizeof(vendor) * sizeof(efi_char16_t));
if (c16) {
for (i = 0; i < sizeof(vendor) - 1 && c16[i]; ++i)
vendor[i] = c16[i];
vendor[i] = '\0';
unmap_fw_vendor(c16, sizeof(vendor) * sizeof(efi_char16_t));
}
rev = (u16)systab_hdr->revision;
pr_info("EFI v%u.%u", systab_hdr->revision >> 16, rev / 10);
rev %= 10;
if (rev)
pr_cont(".%u", rev);
pr_cont(" by %s\n", vendor);
if (IS_ENABLED(CONFIG_X86_64) &&
systab_hdr->revision > EFI_1_10_SYSTEM_TABLE_REVISION &&
!strcmp(vendor, "Apple")) {
pr_info("Apple Mac detected, using EFI v1.10 runtime services only\n");
efi.runtime_version = EFI_1_10_SYSTEM_TABLE_REVISION;
}
}
static __initdata char memory_type_name[][13] = {
"Reserved",
"Loader Code",
"Loader Data",
"Boot Code",
"Boot Data",
"Runtime Code",
"Runtime Data",
"Conventional",
"Unusable",
"ACPI Reclaim",
"ACPI Mem NVS",
"MMIO",
"MMIO Port",
"PAL Code",
"Persistent",
"Unaccepted",
};
char * __init efi_md_typeattr_format(char *buf, size_t size,
const efi_memory_desc_t *md)
{
char *pos;
int type_len;
u64 attr;
pos = buf;
if (md->type >= ARRAY_SIZE(memory_type_name))
type_len = snprintf(pos, size, "[type=%u", md->type);
else
type_len = snprintf(pos, size, "[%-*s",
(int)(sizeof(memory_type_name[0]) - 1),
memory_type_name[md->type]);
if (type_len >= size)
return buf;
pos += type_len;
size -= type_len;
attr = md->attribute;
if (attr & ~(EFI_MEMORY_UC | EFI_MEMORY_WC | EFI_MEMORY_WT |
EFI_MEMORY_WB | EFI_MEMORY_UCE | EFI_MEMORY_RO |
EFI_MEMORY_WP | EFI_MEMORY_RP | EFI_MEMORY_XP |
EFI_MEMORY_NV | EFI_MEMORY_SP | EFI_MEMORY_CPU_CRYPTO |
EFI_MEMORY_RUNTIME | EFI_MEMORY_MORE_RELIABLE))
snprintf(pos, size, "|attr=0x%016llx]",
(unsigned long long)attr);
else
snprintf(pos, size,
"|%3s|%2s|%2s|%2s|%2s|%2s|%2s|%2s|%2s|%3s|%2s|%2s|%2s|%2s]",
attr & EFI_MEMORY_RUNTIME ? "RUN" : "",
attr & EFI_MEMORY_MORE_RELIABLE ? "MR" : "",
attr & EFI_MEMORY_CPU_CRYPTO ? "CC" : "",
attr & EFI_MEMORY_SP ? "SP" : "",
attr & EFI_MEMORY_NV ? "NV" : "",
attr & EFI_MEMORY_XP ? "XP" : "",
attr & EFI_MEMORY_RP ? "RP" : "",
attr & EFI_MEMORY_WP ? "WP" : "",
attr & EFI_MEMORY_RO ? "RO" : "",
attr & EFI_MEMORY_UCE ? "UCE" : "",
attr & EFI_MEMORY_WB ? "WB" : "",
attr & EFI_MEMORY_WT ? "WT" : "",
attr & EFI_MEMORY_WC ? "WC" : "",
attr & EFI_MEMORY_UC ? "UC" : "");
return buf;
}
/*
* IA64 has a funky EFI memory map that doesn't work the same way as
* other architectures.
*/
#ifndef CONFIG_IA64
/*
* efi_mem_attributes - lookup memmap attributes for physical address
* @phys_addr: the physical address to lookup
*
* Search in the EFI memory map for the region covering
* @phys_addr. Returns the EFI memory attributes if the region
* was found in the memory map, 0 otherwise.
*/
u64 efi_mem_attributes(unsigned long phys_addr)
{
efi_memory_desc_t *md;
if (!efi_enabled(EFI_MEMMAP))
return 0;
for_each_efi_memory_desc(md) {
if ((md->phys_addr <= phys_addr) &&
(phys_addr < (md->phys_addr +
(md->num_pages << EFI_PAGE_SHIFT))))
return md->attribute;
}
return 0;
}
/*
* efi_mem_type - lookup memmap type for physical address
* @phys_addr: the physical address to lookup
*
* Search in the EFI memory map for the region covering @phys_addr.
* Returns the EFI memory type if the region was found in the memory
* map, -EINVAL otherwise.
*/
int efi_mem_type(unsigned long phys_addr)
{
const efi_memory_desc_t *md;
if (!efi_enabled(EFI_MEMMAP))
return -ENOTSUPP;
for_each_efi_memory_desc(md) {
if ((md->phys_addr <= phys_addr) &&
(phys_addr < (md->phys_addr +
(md->num_pages << EFI_PAGE_SHIFT))))
return md->type;
}
return -EINVAL;
}
#endif
int efi_status_to_err(efi_status_t status)
{
int err;
switch (status) {
case EFI_SUCCESS:
err = 0;
break;
case EFI_INVALID_PARAMETER:
err = -EINVAL;
break;
case EFI_OUT_OF_RESOURCES:
err = -ENOSPC;
break;
case EFI_DEVICE_ERROR:
err = -EIO;
break;
case EFI_WRITE_PROTECTED:
err = -EROFS;
break;
case EFI_SECURITY_VIOLATION:
err = -EACCES;
break;
case EFI_NOT_FOUND:
err = -ENOENT;
break;
case EFI_ABORTED:
err = -EINTR;
break;
default:
err = -EINVAL;
}
return err;
}
EXPORT_SYMBOL_GPL(efi_status_to_err);
static DEFINE_SPINLOCK(efi_mem_reserve_persistent_lock);
static struct linux_efi_memreserve *efi_memreserve_root __ro_after_init;
static int __init efi_memreserve_map_root(void)
{
if (mem_reserve == EFI_INVALID_TABLE_ADDR)
return -ENODEV;
efi_memreserve_root = memremap(mem_reserve,
sizeof(*efi_memreserve_root),
MEMREMAP_WB);
if (WARN_ON_ONCE(!efi_memreserve_root))
return -ENOMEM;
return 0;
}
static int efi_mem_reserve_iomem(phys_addr_t addr, u64 size)
{
struct resource *res, *parent;
int ret;
res = kzalloc(sizeof(struct resource), GFP_ATOMIC);
if (!res)
return -ENOMEM;
res->name = "reserved";
res->flags = IORESOURCE_MEM;
res->start = addr;
res->end = addr + size - 1;
/* we expect a conflict with a 'System RAM' region */
parent = request_resource_conflict(&iomem_resource, res);
ret = parent ? request_resource(parent, res) : 0;
/*
* Given that efi_mem_reserve_iomem() can be called at any
* time, only call memblock_reserve() if the architecture
* keeps the infrastructure around.
*/
if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK) && !ret)
memblock_reserve(addr, size);
return ret;
}
int __ref efi_mem_reserve_persistent(phys_addr_t addr, u64 size)
{
struct linux_efi_memreserve *rsv;
unsigned long prsv;
int rc, index;
if (efi_memreserve_root == (void *)ULONG_MAX)
return -ENODEV;
if (!efi_memreserve_root) {
rc = efi_memreserve_map_root();
if (rc)
return rc;
}
/* first try to find a slot in an existing linked list entry */
for (prsv = efi_memreserve_root->next; prsv; ) {
rsv = memremap(prsv, sizeof(*rsv), MEMREMAP_WB);
if (!rsv)
return -ENOMEM;
index = atomic_fetch_add_unless(&rsv->count, 1, rsv->size);
if (index < rsv->size) {
rsv->entry[index].base = addr;
rsv->entry[index].size = size;
memunmap(rsv);
return efi_mem_reserve_iomem(addr, size);
}
prsv = rsv->next;
memunmap(rsv);
}
/* no slot found - allocate a new linked list entry */
rsv = (struct linux_efi_memreserve *)__get_free_page(GFP_ATOMIC);
if (!rsv)
return -ENOMEM;
rc = efi_mem_reserve_iomem(__pa(rsv), SZ_4K);
if (rc) {
free_page((unsigned long)rsv);
return rc;
}
/*
* The memremap() call above assumes that a linux_efi_memreserve entry
* never crosses a page boundary, so let's ensure that this remains true
* even when kexec'ing a 4k pages kernel from a >4k pages kernel, by
* using SZ_4K explicitly in the size calculation below.
*/
rsv->size = EFI_MEMRESERVE_COUNT(SZ_4K);
atomic_set(&rsv->count, 1);
rsv->entry[0].base = addr;
rsv->entry[0].size = size;
spin_lock(&efi_mem_reserve_persistent_lock);
rsv->next = efi_memreserve_root->next;
efi_memreserve_root->next = __pa(rsv);
spin_unlock(&efi_mem_reserve_persistent_lock);
return efi_mem_reserve_iomem(addr, size);
}
static int __init efi_memreserve_root_init(void)
{
if (efi_memreserve_root)
return 0;
if (efi_memreserve_map_root())
efi_memreserve_root = (void *)ULONG_MAX;
return 0;
}
early_initcall(efi_memreserve_root_init);
#ifdef CONFIG_KEXEC
static int update_efi_random_seed(struct notifier_block *nb,
unsigned long code, void *unused)
{
struct linux_efi_random_seed *seed;
u32 size = 0;
if (!kexec_in_progress)
return NOTIFY_DONE;
seed = memremap(efi_rng_seed, sizeof(*seed), MEMREMAP_WB);
if (seed != NULL) {
size = min(seed->size, EFI_RANDOM_SEED_SIZE);
memunmap(seed);
} else {
pr_err("Could not map UEFI random seed!\n");
}
if (size > 0) {
seed = memremap(efi_rng_seed, sizeof(*seed) + size,
MEMREMAP_WB);
if (seed != NULL) {
seed->size = size;
get_random_bytes(seed->bits, seed->size);
memunmap(seed);
} else {
pr_err("Could not map UEFI random seed!\n");
}
}
return NOTIFY_DONE;
}
static struct notifier_block efi_random_seed_nb = {
.notifier_call = update_efi_random_seed,
};
static int __init register_update_efi_random_seed(void)
{
if (efi_rng_seed == EFI_INVALID_TABLE_ADDR)
return 0;
return register_reboot_notifier(&efi_random_seed_nb);
}
late_initcall(register_update_efi_random_seed);
#endif
| linux-master | drivers/firmware/efi/efi.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Extensible Firmware Interface
*
* Copyright (C) 2020 Western Digital Corporation or its affiliates.
*
* Based on Extensible Firmware Interface Specification version 2.4
* Adapted from drivers/firmware/efi/arm-runtime.c
*
*/
#include <linux/dmi.h>
#include <linux/efi.h>
#include <linux/io.h>
#include <linux/memblock.h>
#include <linux/mm_types.h>
#include <linux/preempt.h>
#include <linux/rbtree.h>
#include <linux/rwsem.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/pgtable.h>
#include <asm/cacheflush.h>
#include <asm/efi.h>
#include <asm/mmu.h>
#include <asm/pgalloc.h>
static bool __init efi_virtmap_init(void)
{
efi_memory_desc_t *md;
efi_mm.pgd = pgd_alloc(&efi_mm);
mm_init_cpumask(&efi_mm);
init_new_context(NULL, &efi_mm);
for_each_efi_memory_desc(md) {
phys_addr_t phys = md->phys_addr;
int ret;
if (!(md->attribute & EFI_MEMORY_RUNTIME))
continue;
if (md->virt_addr == U64_MAX)
return false;
ret = efi_create_mapping(&efi_mm, md);
if (ret) {
pr_warn(" EFI remap %pa: failed to create mapping (%d)\n",
&phys, ret);
return false;
}
}
if (efi_memattr_apply_permissions(&efi_mm, efi_set_mapping_permissions))
return false;
return true;
}
/*
* Enable the UEFI Runtime Services if all prerequisites are in place, i.e.,
* non-early mapping of the UEFI system table and virtual mappings for all
* EFI_MEMORY_RUNTIME regions.
*/
static int __init riscv_enable_runtime_services(void)
{
u64 mapsize;
if (!efi_enabled(EFI_BOOT)) {
pr_info("EFI services will not be available.\n");
return 0;
}
efi_memmap_unmap();
mapsize = efi.memmap.desc_size * efi.memmap.nr_map;
if (efi_memmap_init_late(efi.memmap.phys_map, mapsize)) {
pr_err("Failed to remap EFI memory map\n");
return 0;
}
if (efi_soft_reserve_enabled()) {
efi_memory_desc_t *md;
for_each_efi_memory_desc(md) {
int md_size = md->num_pages << EFI_PAGE_SHIFT;
struct resource *res;
if (!(md->attribute & EFI_MEMORY_SP))
continue;
res = kzalloc(sizeof(*res), GFP_KERNEL);
if (WARN_ON(!res))
break;
res->start = md->phys_addr;
res->end = md->phys_addr + md_size - 1;
res->name = "Soft Reserved";
res->flags = IORESOURCE_MEM;
res->desc = IORES_DESC_SOFT_RESERVED;
insert_resource(&iomem_resource, res);
}
}
if (efi_runtime_disabled()) {
pr_info("EFI runtime services will be disabled.\n");
return 0;
}
if (efi_enabled(EFI_RUNTIME_SERVICES)) {
pr_info("EFI runtime services access via paravirt.\n");
return 0;
}
pr_info("Remapping and enabling EFI services.\n");
if (!efi_virtmap_init()) {
pr_err("UEFI virtual mapping missing or invalid -- runtime services will not be available\n");
return -ENOMEM;
}
/* Set up runtime services function pointers */
efi_native_runtime_setup();
set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
return 0;
}
early_initcall(riscv_enable_runtime_services);
static void efi_virtmap_load(void)
{
preempt_disable();
switch_mm(current->active_mm, &efi_mm, NULL);
}
static void efi_virtmap_unload(void)
{
switch_mm(&efi_mm, current->active_mm, NULL);
preempt_enable();
}
void arch_efi_call_virt_setup(void)
{
sync_kernel_mappings(efi_mm.pgd);
efi_virtmap_load();
}
void arch_efi_call_virt_teardown(void)
{
efi_virtmap_unload();
}
| linux-master | drivers/firmware/efi/riscv-runtime.c |
// SPDX-License-Identifier: GPL-2.0
/*
* efibc: control EFI bootloaders which obey LoaderEntryOneShot var
* Copyright (c) 2013-2016, Intel Corporation.
*/
#define pr_fmt(fmt) "efibc: " fmt
#include <linux/efi.h>
#include <linux/module.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/ucs2_string.h>
#define MAX_DATA_LEN 512
static int efibc_set_variable(efi_char16_t *name, efi_char16_t *value,
unsigned long len)
{
efi_status_t status;
status = efi.set_variable(name, &LINUX_EFI_LOADER_ENTRY_GUID,
EFI_VARIABLE_NON_VOLATILE
| EFI_VARIABLE_BOOTSERVICE_ACCESS
| EFI_VARIABLE_RUNTIME_ACCESS,
len * sizeof(efi_char16_t), value);
if (status != EFI_SUCCESS) {
pr_err("failed to set EFI variable: 0x%lx\n", status);
return -EIO;
}
return 0;
}
static int efibc_reboot_notifier_call(struct notifier_block *notifier,
unsigned long event, void *data)
{
efi_char16_t *reason = event == SYS_RESTART ? L"reboot"
: L"shutdown";
const u8 *str = data;
efi_char16_t *wdata;
unsigned long l;
int ret;
ret = efibc_set_variable(L"LoaderEntryRebootReason", reason,
ucs2_strlen(reason));
if (ret || !data)
return NOTIFY_DONE;
wdata = kmalloc(MAX_DATA_LEN * sizeof(efi_char16_t), GFP_KERNEL);
if (!wdata)
return NOTIFY_DONE;
for (l = 0; l < MAX_DATA_LEN - 1 && str[l] != '\0'; l++)
wdata[l] = str[l];
wdata[l] = L'\0';
efibc_set_variable(L"LoaderEntryOneShot", wdata, l);
kfree(wdata);
return NOTIFY_DONE;
}
static struct notifier_block efibc_reboot_notifier = {
.notifier_call = efibc_reboot_notifier_call,
};
static int __init efibc_init(void)
{
int ret;
if (!efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE))
return -ENODEV;
ret = register_reboot_notifier(&efibc_reboot_notifier);
if (ret)
pr_err("unable to register reboot notifier\n");
return ret;
}
module_init(efibc_init);
static void __exit efibc_exit(void)
{
unregister_reboot_notifier(&efibc_reboot_notifier);
}
module_exit(efibc_exit);
MODULE_AUTHOR("Jeremy Compostella <[email protected]>");
MODULE_AUTHOR("Matt Gumbel <[email protected]");
MODULE_DESCRIPTION("EFI Bootloader Control");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/firmware/efi/efibc.c |
// SPDX-License-Identifier: GPL-2.0-only
#define pr_fmt(fmt) "efi: " fmt
#include <linux/module.h>
#include <linux/init.h>
#include <linux/efi.h>
#include <linux/libfdt.h>
#include <linux/of_fdt.h>
#include <asm/unaligned.h>
enum {
SYSTAB,
MMBASE,
MMSIZE,
DCSIZE,
DCVERS,
PARAMCOUNT
};
static __initconst const char name[][22] = {
[SYSTAB] = "System Table ",
[MMBASE] = "MemMap Address ",
[MMSIZE] = "MemMap Size ",
[DCSIZE] = "MemMap Desc. Size ",
[DCVERS] = "MemMap Desc. Version ",
};
static __initconst const struct {
const char path[17];
u8 paravirt;
const char params[PARAMCOUNT][26];
} dt_params[] = {
{
#ifdef CONFIG_XEN // <-------17------>
.path = "/hypervisor/uefi",
.paravirt = 1,
.params = {
[SYSTAB] = "xen,uefi-system-table",
[MMBASE] = "xen,uefi-mmap-start",
[MMSIZE] = "xen,uefi-mmap-size",
[DCSIZE] = "xen,uefi-mmap-desc-size",
[DCVERS] = "xen,uefi-mmap-desc-ver",
}
}, {
#endif
.path = "/chosen",
.params = { // <-----------26----------->
[SYSTAB] = "linux,uefi-system-table",
[MMBASE] = "linux,uefi-mmap-start",
[MMSIZE] = "linux,uefi-mmap-size",
[DCSIZE] = "linux,uefi-mmap-desc-size",
[DCVERS] = "linux,uefi-mmap-desc-ver",
}
}
};
static int __init efi_get_fdt_prop(const void *fdt, int node, const char *pname,
const char *rname, void *var, int size)
{
const void *prop;
int len;
u64 val;
prop = fdt_getprop(fdt, node, pname, &len);
if (!prop)
return 1;
val = (len == 4) ? (u64)be32_to_cpup(prop) : get_unaligned_be64(prop);
if (size == 8)
*(u64 *)var = val;
else
*(u32 *)var = (val < U32_MAX) ? val : U32_MAX; // saturate
if (efi_enabled(EFI_DBG))
pr_info(" %s: 0x%0*llx\n", rname, size * 2, val);
return 0;
}
u64 __init efi_get_fdt_params(struct efi_memory_map_data *mm)
{
const void *fdt = initial_boot_params;
unsigned long systab;
int i, j, node;
struct {
void *var;
int size;
} target[] = {
[SYSTAB] = { &systab, sizeof(systab) },
[MMBASE] = { &mm->phys_map, sizeof(mm->phys_map) },
[MMSIZE] = { &mm->size, sizeof(mm->size) },
[DCSIZE] = { &mm->desc_size, sizeof(mm->desc_size) },
[DCVERS] = { &mm->desc_version, sizeof(mm->desc_version) },
};
BUILD_BUG_ON(ARRAY_SIZE(target) != ARRAY_SIZE(name));
BUILD_BUG_ON(ARRAY_SIZE(target) != ARRAY_SIZE(dt_params[0].params));
if (!fdt)
return 0;
for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
node = fdt_path_offset(fdt, dt_params[i].path);
if (node < 0)
continue;
if (efi_enabled(EFI_DBG))
pr_info("Getting UEFI parameters from %s in DT:\n",
dt_params[i].path);
for (j = 0; j < ARRAY_SIZE(target); j++) {
const char *pname = dt_params[i].params[j];
if (!efi_get_fdt_prop(fdt, node, pname, name[j],
target[j].var, target[j].size))
continue;
if (!j)
goto notfound;
pr_err("Can't find property '%s' in DT!\n", pname);
return 0;
}
if (dt_params[i].paravirt)
set_bit(EFI_PARAVIRT, &efi.flags);
return systab;
}
notfound:
pr_info("UEFI not found.\n");
return 0;
}
| linux-master | drivers/firmware/efi/fdtparams.c |
// SPDX-License-Identifier: GPL-2.0
/*
* EFI capsule loader driver.
*
* Copyright 2015 Intel Corporation
*/
#define pr_fmt(fmt) "efi: " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/highmem.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/efi.h>
#include <linux/vmalloc.h>
#define NO_FURTHER_WRITE_ACTION -1
/**
* efi_free_all_buff_pages - free all previous allocated buffer pages
* @cap_info: pointer to current instance of capsule_info structure
*
* In addition to freeing buffer pages, it flags NO_FURTHER_WRITE_ACTION
* to cease processing data in subsequent write(2) calls until close(2)
* is called.
**/
static void efi_free_all_buff_pages(struct capsule_info *cap_info)
{
while (cap_info->index > 0)
__free_page(cap_info->pages[--cap_info->index]);
cap_info->index = NO_FURTHER_WRITE_ACTION;
}
int __efi_capsule_setup_info(struct capsule_info *cap_info)
{
size_t pages_needed;
int ret;
void *temp_page;
pages_needed = ALIGN(cap_info->total_size, PAGE_SIZE) / PAGE_SIZE;
if (pages_needed == 0) {
pr_err("invalid capsule size\n");
return -EINVAL;
}
/* Check if the capsule binary supported */
ret = efi_capsule_supported(cap_info->header.guid,
cap_info->header.flags,
cap_info->header.imagesize,
&cap_info->reset_type);
if (ret) {
pr_err("capsule not supported\n");
return ret;
}
temp_page = krealloc(cap_info->pages,
pages_needed * sizeof(void *),
GFP_KERNEL | __GFP_ZERO);
if (!temp_page)
return -ENOMEM;
cap_info->pages = temp_page;
temp_page = krealloc(cap_info->phys,
pages_needed * sizeof(phys_addr_t *),
GFP_KERNEL | __GFP_ZERO);
if (!temp_page)
return -ENOMEM;
cap_info->phys = temp_page;
return 0;
}
/**
* efi_capsule_setup_info - obtain the efi capsule header in the binary and
* setup capsule_info structure
* @cap_info: pointer to current instance of capsule_info structure
* @kbuff: a mapped first page buffer pointer
* @hdr_bytes: the total received number of bytes for efi header
*
* Platforms with non-standard capsule update mechanisms can override
* this __weak function so they can perform any required capsule
* image munging. See quark_quirk_function() for an example.
**/
int __weak efi_capsule_setup_info(struct capsule_info *cap_info, void *kbuff,
size_t hdr_bytes)
{
/* Only process data block that is larger than efi header size */
if (hdr_bytes < sizeof(efi_capsule_header_t))
return 0;
memcpy(&cap_info->header, kbuff, sizeof(cap_info->header));
cap_info->total_size = cap_info->header.imagesize;
return __efi_capsule_setup_info(cap_info);
}
/**
* efi_capsule_submit_update - invoke the efi_capsule_update API once binary
* upload done
* @cap_info: pointer to current instance of capsule_info structure
**/
static ssize_t efi_capsule_submit_update(struct capsule_info *cap_info)
{
bool do_vunmap = false;
int ret;
/*
* cap_info->capsule may have been assigned already by a quirk
* handler, so only overwrite it if it is NULL
*/
if (!cap_info->capsule) {
cap_info->capsule = vmap(cap_info->pages, cap_info->index,
VM_MAP, PAGE_KERNEL);
if (!cap_info->capsule)
return -ENOMEM;
do_vunmap = true;
}
ret = efi_capsule_update(cap_info->capsule, cap_info->phys);
if (do_vunmap)
vunmap(cap_info->capsule);
if (ret) {
pr_err("capsule update failed\n");
return ret;
}
/* Indicate capsule binary uploading is done */
cap_info->index = NO_FURTHER_WRITE_ACTION;
if (cap_info->header.flags & EFI_CAPSULE_PERSIST_ACROSS_RESET) {
pr_info("Successfully uploaded capsule file with reboot type '%s'\n",
!cap_info->reset_type ? "RESET_COLD" :
cap_info->reset_type == 1 ? "RESET_WARM" :
"RESET_SHUTDOWN");
} else {
pr_info("Successfully processed capsule file\n");
}
return 0;
}
/**
* efi_capsule_write - store the capsule binary and pass it to
* efi_capsule_update() API
* @file: file pointer
* @buff: buffer pointer
* @count: number of bytes in @buff
* @offp: not used
*
* Expectation:
* - A user space tool should start at the beginning of capsule binary and
* pass data in sequentially.
* - Users should close and re-open this file note in order to upload more
* capsules.
* - After an error returned, user should close the file and restart the
* operation for the next try otherwise -EIO will be returned until the
* file is closed.
* - An EFI capsule header must be located at the beginning of capsule
* binary file and passed in as first block data of write operation.
**/
static ssize_t efi_capsule_write(struct file *file, const char __user *buff,
size_t count, loff_t *offp)
{
int ret;
struct capsule_info *cap_info = file->private_data;
struct page *page;
void *kbuff = NULL;
size_t write_byte;
if (count == 0)
return 0;
/* Return error while NO_FURTHER_WRITE_ACTION is flagged */
if (cap_info->index < 0)
return -EIO;
/* Only alloc a new page when previous page is full */
if (!cap_info->page_bytes_remain) {
page = alloc_page(GFP_KERNEL);
if (!page) {
ret = -ENOMEM;
goto failed;
}
cap_info->pages[cap_info->index] = page;
cap_info->phys[cap_info->index] = page_to_phys(page);
cap_info->page_bytes_remain = PAGE_SIZE;
cap_info->index++;
} else {
page = cap_info->pages[cap_info->index - 1];
}
kbuff = kmap(page);
kbuff += PAGE_SIZE - cap_info->page_bytes_remain;
/* Copy capsule binary data from user space to kernel space buffer */
write_byte = min_t(size_t, count, cap_info->page_bytes_remain);
if (copy_from_user(kbuff, buff, write_byte)) {
ret = -EFAULT;
goto fail_unmap;
}
cap_info->page_bytes_remain -= write_byte;
/* Setup capsule binary info structure */
if (cap_info->header.headersize == 0) {
ret = efi_capsule_setup_info(cap_info, kbuff - cap_info->count,
cap_info->count + write_byte);
if (ret)
goto fail_unmap;
}
cap_info->count += write_byte;
kunmap(page);
/* Submit the full binary to efi_capsule_update() API */
if (cap_info->header.headersize > 0 &&
cap_info->count >= cap_info->total_size) {
if (cap_info->count > cap_info->total_size) {
pr_err("capsule upload size exceeded header defined size\n");
ret = -EINVAL;
goto failed;
}
ret = efi_capsule_submit_update(cap_info);
if (ret)
goto failed;
}
return write_byte;
fail_unmap:
kunmap(page);
failed:
efi_free_all_buff_pages(cap_info);
return ret;
}
/**
* efi_capsule_release - called by file close
* @inode: not used
* @file: file pointer
*
* We will not free successfully submitted pages since efi update
* requires data to be maintained across system reboot.
**/
static int efi_capsule_release(struct inode *inode, struct file *file)
{
struct capsule_info *cap_info = file->private_data;
if (cap_info->index > 0 &&
(cap_info->header.headersize == 0 ||
cap_info->count < cap_info->total_size)) {
pr_err("capsule upload not complete\n");
efi_free_all_buff_pages(cap_info);
}
kfree(cap_info->pages);
kfree(cap_info->phys);
kfree(file->private_data);
file->private_data = NULL;
return 0;
}
/**
* efi_capsule_open - called by file open
* @inode: not used
* @file: file pointer
*
* Will allocate each capsule_info memory for each file open call.
* This provided the capability to support multiple file open feature
* where user is not needed to wait for others to finish in order to
* upload their capsule binary.
**/
static int efi_capsule_open(struct inode *inode, struct file *file)
{
struct capsule_info *cap_info;
cap_info = kzalloc(sizeof(*cap_info), GFP_KERNEL);
if (!cap_info)
return -ENOMEM;
cap_info->pages = kzalloc(sizeof(void *), GFP_KERNEL);
if (!cap_info->pages) {
kfree(cap_info);
return -ENOMEM;
}
cap_info->phys = kzalloc(sizeof(void *), GFP_KERNEL);
if (!cap_info->phys) {
kfree(cap_info->pages);
kfree(cap_info);
return -ENOMEM;
}
file->private_data = cap_info;
return 0;
}
static const struct file_operations efi_capsule_fops = {
.owner = THIS_MODULE,
.open = efi_capsule_open,
.write = efi_capsule_write,
.release = efi_capsule_release,
.llseek = no_llseek,
};
static struct miscdevice efi_capsule_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = "efi_capsule_loader",
.fops = &efi_capsule_fops,
};
static int __init efi_capsule_loader_init(void)
{
int ret;
if (!efi_enabled(EFI_RUNTIME_SERVICES))
return -ENODEV;
ret = misc_register(&efi_capsule_misc);
if (ret)
pr_err("Unable to register capsule loader device\n");
return ret;
}
module_init(efi_capsule_loader_init);
static void __exit efi_capsule_loader_exit(void)
{
misc_deregister(&efi_capsule_misc);
}
module_exit(efi_capsule_loader_exit);
MODULE_DESCRIPTION("EFI capsule firmware binary loader");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/firmware/efi/capsule-loader.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Extensible Firmware Interface
*
* Based on Extensible Firmware Interface Specification version 2.4
*
* Copyright (C) 2013 - 2015 Linaro Ltd.
*/
#define pr_fmt(fmt) "efi: " fmt
#include <linux/efi.h>
#include <linux/fwnode.h>
#include <linux/init.h>
#include <linux/memblock.h>
#include <linux/mm_types.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_fdt.h>
#include <linux/platform_device.h>
#include <linux/screen_info.h>
#include <asm/efi.h>
unsigned long __initdata screen_info_table = EFI_INVALID_TABLE_ADDR;
static int __init is_memory(efi_memory_desc_t *md)
{
if (md->attribute & (EFI_MEMORY_WB|EFI_MEMORY_WT|EFI_MEMORY_WC))
return 1;
return 0;
}
/*
* Translate a EFI virtual address into a physical address: this is necessary,
* as some data members of the EFI system table are virtually remapped after
* SetVirtualAddressMap() has been called.
*/
static phys_addr_t __init efi_to_phys(unsigned long addr)
{
efi_memory_desc_t *md;
for_each_efi_memory_desc(md) {
if (!(md->attribute & EFI_MEMORY_RUNTIME))
continue;
if (md->virt_addr == 0)
/* no virtual mapping has been installed by the stub */
break;
if (md->virt_addr <= addr &&
(addr - md->virt_addr) < (md->num_pages << EFI_PAGE_SHIFT))
return md->phys_addr + addr - md->virt_addr;
}
return addr;
}
extern __weak const efi_config_table_type_t efi_arch_tables[];
static void __init init_screen_info(void)
{
struct screen_info *si;
if (screen_info_table != EFI_INVALID_TABLE_ADDR) {
si = early_memremap(screen_info_table, sizeof(*si));
if (!si) {
pr_err("Could not map screen_info config table\n");
return;
}
screen_info = *si;
memset(si, 0, sizeof(*si));
early_memunmap(si, sizeof(*si));
if (memblock_is_map_memory(screen_info.lfb_base))
memblock_mark_nomap(screen_info.lfb_base,
screen_info.lfb_size);
if (IS_ENABLED(CONFIG_EFI_EARLYCON))
efi_earlycon_reprobe();
}
}
static int __init uefi_init(u64 efi_system_table)
{
efi_config_table_t *config_tables;
efi_system_table_t *systab;
size_t table_size;
int retval;
systab = early_memremap_ro(efi_system_table, sizeof(efi_system_table_t));
if (systab == NULL) {
pr_warn("Unable to map EFI system table.\n");
return -ENOMEM;
}
set_bit(EFI_BOOT, &efi.flags);
if (IS_ENABLED(CONFIG_64BIT))
set_bit(EFI_64BIT, &efi.flags);
retval = efi_systab_check_header(&systab->hdr);
if (retval)
goto out;
efi.runtime = systab->runtime;
efi.runtime_version = systab->hdr.revision;
efi_systab_report_header(&systab->hdr, efi_to_phys(systab->fw_vendor));
table_size = sizeof(efi_config_table_t) * systab->nr_tables;
config_tables = early_memremap_ro(efi_to_phys(systab->tables),
table_size);
if (config_tables == NULL) {
pr_warn("Unable to map EFI config table array.\n");
retval = -ENOMEM;
goto out;
}
retval = efi_config_parse_tables(config_tables, systab->nr_tables,
efi_arch_tables);
early_memunmap(config_tables, table_size);
out:
early_memunmap(systab, sizeof(efi_system_table_t));
return retval;
}
/*
* Return true for regions that can be used as System RAM.
*/
static __init int is_usable_memory(efi_memory_desc_t *md)
{
switch (md->type) {
case EFI_LOADER_CODE:
case EFI_LOADER_DATA:
case EFI_ACPI_RECLAIM_MEMORY:
case EFI_BOOT_SERVICES_CODE:
case EFI_BOOT_SERVICES_DATA:
case EFI_CONVENTIONAL_MEMORY:
case EFI_PERSISTENT_MEMORY:
/*
* Special purpose memory is 'soft reserved', which means it
* is set aside initially, but can be hotplugged back in or
* be assigned to the dax driver after boot.
*/
if (efi_soft_reserve_enabled() &&
(md->attribute & EFI_MEMORY_SP))
return false;
/*
* According to the spec, these regions are no longer reserved
* after calling ExitBootServices(). However, we can only use
* them as System RAM if they can be mapped writeback cacheable.
*/
return (md->attribute & EFI_MEMORY_WB);
default:
break;
}
return false;
}
static __init void reserve_regions(void)
{
efi_memory_desc_t *md;
u64 paddr, npages, size;
if (efi_enabled(EFI_DBG))
pr_info("Processing EFI memory map:\n");
/*
* Discard memblocks discovered so far: if there are any at this
* point, they originate from memory nodes in the DT, and UEFI
* uses its own memory map instead.
*/
memblock_dump_all();
memblock_remove(0, PHYS_ADDR_MAX);
for_each_efi_memory_desc(md) {
paddr = md->phys_addr;
npages = md->num_pages;
if (efi_enabled(EFI_DBG)) {
char buf[64];
pr_info(" 0x%012llx-0x%012llx %s\n",
paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
efi_md_typeattr_format(buf, sizeof(buf), md));
}
memrange_efi_to_native(&paddr, &npages);
size = npages << PAGE_SHIFT;
if (is_memory(md)) {
early_init_dt_add_memory_arch(paddr, size);
if (!is_usable_memory(md))
memblock_mark_nomap(paddr, size);
/* keep ACPI reclaim memory intact for kexec etc. */
if (md->type == EFI_ACPI_RECLAIM_MEMORY)
memblock_reserve(paddr, size);
}
}
}
void __init efi_init(void)
{
struct efi_memory_map_data data;
u64 efi_system_table;
/* Grab UEFI information placed in FDT by stub */
efi_system_table = efi_get_fdt_params(&data);
if (!efi_system_table)
return;
if (efi_memmap_init_early(&data) < 0) {
/*
* If we are booting via UEFI, the UEFI memory map is the only
* description of memory we have, so there is little point in
* proceeding if we cannot access it.
*/
panic("Unable to map EFI memory map.\n");
}
WARN(efi.memmap.desc_version != 1,
"Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
efi.memmap.desc_version);
if (uefi_init(efi_system_table) < 0) {
efi_memmap_unmap();
return;
}
reserve_regions();
/*
* For memblock manipulation, the cap should come after the memblock_add().
* And now, memblock is fully populated, it is time to do capping.
*/
early_init_dt_check_for_usable_mem_range();
efi_find_mirror();
efi_esrt_init();
efi_mokvar_table_init();
memblock_reserve(data.phys_map & PAGE_MASK,
PAGE_ALIGN(data.size + (data.phys_map & ~PAGE_MASK)));
init_screen_info();
}
| linux-master | drivers/firmware/efi/efi-init.c |
// SPDX-License-Identifier: GPL-2.0
/*
* UEFI Common Platform Error Record (CPER) support
*
* Copyright (C) 2010, Intel Corp.
* Author: Huang Ying <[email protected]>
*
* CPER is the format used to describe platform hardware error by
* various tables, such as ERST, BERT and HEST etc.
*
* For more information about CPER, please refer to Appendix N of UEFI
* Specification version 2.4.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/time.h>
#include <linux/cper.h>
#include <linux/dmi.h>
#include <linux/acpi.h>
#include <linux/pci.h>
#include <linux/aer.h>
#include <linux/printk.h>
#include <linux/bcd.h>
#include <acpi/ghes.h>
#include <ras/ras_event.h>
#include "cper_cxl.h"
/*
* CPER record ID need to be unique even after reboot, because record
* ID is used as index for ERST storage, while CPER records from
* multiple boot may co-exist in ERST.
*/
u64 cper_next_record_id(void)
{
static atomic64_t seq;
if (!atomic64_read(&seq)) {
time64_t time = ktime_get_real_seconds();
/*
* This code is unlikely to still be needed in year 2106,
* but just in case, let's use a few more bits for timestamps
* after y2038 to be sure they keep increasing monotonically
* for the next few hundred years...
*/
if (time < 0x80000000)
atomic64_set(&seq, (ktime_get_real_seconds()) << 32);
else
atomic64_set(&seq, 0x8000000000000000ull |
ktime_get_real_seconds() << 24);
}
return atomic64_inc_return(&seq);
}
EXPORT_SYMBOL_GPL(cper_next_record_id);
static const char * const severity_strs[] = {
"recoverable",
"fatal",
"corrected",
"info",
};
const char *cper_severity_str(unsigned int severity)
{
return severity < ARRAY_SIZE(severity_strs) ?
severity_strs[severity] : "unknown";
}
EXPORT_SYMBOL_GPL(cper_severity_str);
/*
* cper_print_bits - print strings for set bits
* @pfx: prefix for each line, including log level and prefix string
* @bits: bit mask
* @strs: string array, indexed by bit position
* @strs_size: size of the string array: @strs
*
* For each set bit in @bits, print the corresponding string in @strs.
* If the output length is longer than 80, multiple line will be
* printed, with @pfx is printed at the beginning of each line.
*/
void cper_print_bits(const char *pfx, unsigned int bits,
const char * const strs[], unsigned int strs_size)
{
int i, len = 0;
const char *str;
char buf[84];
for (i = 0; i < strs_size; i++) {
if (!(bits & (1U << i)))
continue;
str = strs[i];
if (!str)
continue;
if (len && len + strlen(str) + 2 > 80) {
printk("%s\n", buf);
len = 0;
}
if (!len)
len = snprintf(buf, sizeof(buf), "%s%s", pfx, str);
else
len += scnprintf(buf+len, sizeof(buf)-len, ", %s", str);
}
if (len)
printk("%s\n", buf);
}
static const char * const proc_type_strs[] = {
"IA32/X64",
"IA64",
"ARM",
};
static const char * const proc_isa_strs[] = {
"IA32",
"IA64",
"X64",
"ARM A32/T32",
"ARM A64",
};
const char * const cper_proc_error_type_strs[] = {
"cache error",
"TLB error",
"bus error",
"micro-architectural error",
};
static const char * const proc_op_strs[] = {
"unknown or generic",
"data read",
"data write",
"instruction execution",
};
static const char * const proc_flag_strs[] = {
"restartable",
"precise IP",
"overflow",
"corrected",
};
static void cper_print_proc_generic(const char *pfx,
const struct cper_sec_proc_generic *proc)
{
if (proc->validation_bits & CPER_PROC_VALID_TYPE)
printk("%s""processor_type: %d, %s\n", pfx, proc->proc_type,
proc->proc_type < ARRAY_SIZE(proc_type_strs) ?
proc_type_strs[proc->proc_type] : "unknown");
if (proc->validation_bits & CPER_PROC_VALID_ISA)
printk("%s""processor_isa: %d, %s\n", pfx, proc->proc_isa,
proc->proc_isa < ARRAY_SIZE(proc_isa_strs) ?
proc_isa_strs[proc->proc_isa] : "unknown");
if (proc->validation_bits & CPER_PROC_VALID_ERROR_TYPE) {
printk("%s""error_type: 0x%02x\n", pfx, proc->proc_error_type);
cper_print_bits(pfx, proc->proc_error_type,
cper_proc_error_type_strs,
ARRAY_SIZE(cper_proc_error_type_strs));
}
if (proc->validation_bits & CPER_PROC_VALID_OPERATION)
printk("%s""operation: %d, %s\n", pfx, proc->operation,
proc->operation < ARRAY_SIZE(proc_op_strs) ?
proc_op_strs[proc->operation] : "unknown");
if (proc->validation_bits & CPER_PROC_VALID_FLAGS) {
printk("%s""flags: 0x%02x\n", pfx, proc->flags);
cper_print_bits(pfx, proc->flags, proc_flag_strs,
ARRAY_SIZE(proc_flag_strs));
}
if (proc->validation_bits & CPER_PROC_VALID_LEVEL)
printk("%s""level: %d\n", pfx, proc->level);
if (proc->validation_bits & CPER_PROC_VALID_VERSION)
printk("%s""version_info: 0x%016llx\n", pfx, proc->cpu_version);
if (proc->validation_bits & CPER_PROC_VALID_ID)
printk("%s""processor_id: 0x%016llx\n", pfx, proc->proc_id);
if (proc->validation_bits & CPER_PROC_VALID_TARGET_ADDRESS)
printk("%s""target_address: 0x%016llx\n",
pfx, proc->target_addr);
if (proc->validation_bits & CPER_PROC_VALID_REQUESTOR_ID)
printk("%s""requestor_id: 0x%016llx\n",
pfx, proc->requestor_id);
if (proc->validation_bits & CPER_PROC_VALID_RESPONDER_ID)
printk("%s""responder_id: 0x%016llx\n",
pfx, proc->responder_id);
if (proc->validation_bits & CPER_PROC_VALID_IP)
printk("%s""IP: 0x%016llx\n", pfx, proc->ip);
}
static const char * const mem_err_type_strs[] = {
"unknown",
"no error",
"single-bit ECC",
"multi-bit ECC",
"single-symbol chipkill ECC",
"multi-symbol chipkill ECC",
"master abort",
"target abort",
"parity error",
"watchdog timeout",
"invalid address",
"mirror Broken",
"memory sparing",
"scrub corrected error",
"scrub uncorrected error",
"physical memory map-out event",
};
const char *cper_mem_err_type_str(unsigned int etype)
{
return etype < ARRAY_SIZE(mem_err_type_strs) ?
mem_err_type_strs[etype] : "unknown";
}
EXPORT_SYMBOL_GPL(cper_mem_err_type_str);
const char *cper_mem_err_status_str(u64 status)
{
switch ((status >> 8) & 0xff) {
case 1: return "Error detected internal to the component";
case 4: return "Storage error in DRAM memory";
case 5: return "Storage error in TLB";
case 6: return "Storage error in cache";
case 7: return "Error in one or more functional units";
case 8: return "Component failed self test";
case 9: return "Overflow or undervalue of internal queue";
case 16: return "Error detected in the bus";
case 17: return "Virtual address not found on IO-TLB or IO-PDIR";
case 18: return "Improper access error";
case 19: return "Access to a memory address which is not mapped to any component";
case 20: return "Loss of Lockstep";
case 21: return "Response not associated with a request";
case 22: return "Bus parity error - must also set the A, C, or D Bits";
case 23: return "Detection of a protocol error";
case 24: return "Detection of a PATH_ERROR";
case 25: return "Bus operation timeout";
case 26: return "A read was issued to data that has been poisoned";
default: return "Reserved";
}
}
EXPORT_SYMBOL_GPL(cper_mem_err_status_str);
int cper_mem_err_location(struct cper_mem_err_compact *mem, char *msg)
{
u32 len, n;
if (!msg)
return 0;
n = 0;
len = CPER_REC_LEN;
if (mem->validation_bits & CPER_MEM_VALID_NODE)
n += scnprintf(msg + n, len - n, "node:%d ", mem->node);
if (mem->validation_bits & CPER_MEM_VALID_CARD)
n += scnprintf(msg + n, len - n, "card:%d ", mem->card);
if (mem->validation_bits & CPER_MEM_VALID_MODULE)
n += scnprintf(msg + n, len - n, "module:%d ", mem->module);
if (mem->validation_bits & CPER_MEM_VALID_RANK_NUMBER)
n += scnprintf(msg + n, len - n, "rank:%d ", mem->rank);
if (mem->validation_bits & CPER_MEM_VALID_BANK)
n += scnprintf(msg + n, len - n, "bank:%d ", mem->bank);
if (mem->validation_bits & CPER_MEM_VALID_BANK_GROUP)
n += scnprintf(msg + n, len - n, "bank_group:%d ",
mem->bank >> CPER_MEM_BANK_GROUP_SHIFT);
if (mem->validation_bits & CPER_MEM_VALID_BANK_ADDRESS)
n += scnprintf(msg + n, len - n, "bank_address:%d ",
mem->bank & CPER_MEM_BANK_ADDRESS_MASK);
if (mem->validation_bits & CPER_MEM_VALID_DEVICE)
n += scnprintf(msg + n, len - n, "device:%d ", mem->device);
if (mem->validation_bits & (CPER_MEM_VALID_ROW | CPER_MEM_VALID_ROW_EXT)) {
u32 row = mem->row;
row |= cper_get_mem_extension(mem->validation_bits, mem->extended);
n += scnprintf(msg + n, len - n, "row:%d ", row);
}
if (mem->validation_bits & CPER_MEM_VALID_COLUMN)
n += scnprintf(msg + n, len - n, "column:%d ", mem->column);
if (mem->validation_bits & CPER_MEM_VALID_BIT_POSITION)
n += scnprintf(msg + n, len - n, "bit_position:%d ",
mem->bit_pos);
if (mem->validation_bits & CPER_MEM_VALID_REQUESTOR_ID)
n += scnprintf(msg + n, len - n, "requestor_id:0x%016llx ",
mem->requestor_id);
if (mem->validation_bits & CPER_MEM_VALID_RESPONDER_ID)
n += scnprintf(msg + n, len - n, "responder_id:0x%016llx ",
mem->responder_id);
if (mem->validation_bits & CPER_MEM_VALID_TARGET_ID)
n += scnprintf(msg + n, len - n, "target_id:0x%016llx ",
mem->target_id);
if (mem->validation_bits & CPER_MEM_VALID_CHIP_ID)
n += scnprintf(msg + n, len - n, "chip_id:%d ",
mem->extended >> CPER_MEM_CHIP_ID_SHIFT);
return n;
}
EXPORT_SYMBOL_GPL(cper_mem_err_location);
int cper_dimm_err_location(struct cper_mem_err_compact *mem, char *msg)
{
u32 len, n;
const char *bank = NULL, *device = NULL;
if (!msg || !(mem->validation_bits & CPER_MEM_VALID_MODULE_HANDLE))
return 0;
len = CPER_REC_LEN;
dmi_memdev_name(mem->mem_dev_handle, &bank, &device);
if (bank && device)
n = snprintf(msg, len, "DIMM location: %s %s ", bank, device);
else
n = snprintf(msg, len,
"DIMM location: not present. DMI handle: 0x%.4x ",
mem->mem_dev_handle);
return n;
}
EXPORT_SYMBOL_GPL(cper_dimm_err_location);
void cper_mem_err_pack(const struct cper_sec_mem_err *mem,
struct cper_mem_err_compact *cmem)
{
cmem->validation_bits = mem->validation_bits;
cmem->node = mem->node;
cmem->card = mem->card;
cmem->module = mem->module;
cmem->bank = mem->bank;
cmem->device = mem->device;
cmem->row = mem->row;
cmem->column = mem->column;
cmem->bit_pos = mem->bit_pos;
cmem->requestor_id = mem->requestor_id;
cmem->responder_id = mem->responder_id;
cmem->target_id = mem->target_id;
cmem->extended = mem->extended;
cmem->rank = mem->rank;
cmem->mem_array_handle = mem->mem_array_handle;
cmem->mem_dev_handle = mem->mem_dev_handle;
}
EXPORT_SYMBOL_GPL(cper_mem_err_pack);
const char *cper_mem_err_unpack(struct trace_seq *p,
struct cper_mem_err_compact *cmem)
{
const char *ret = trace_seq_buffer_ptr(p);
char rcd_decode_str[CPER_REC_LEN];
if (cper_mem_err_location(cmem, rcd_decode_str))
trace_seq_printf(p, "%s", rcd_decode_str);
if (cper_dimm_err_location(cmem, rcd_decode_str))
trace_seq_printf(p, "%s", rcd_decode_str);
trace_seq_putc(p, '\0');
return ret;
}
static void cper_print_mem(const char *pfx, const struct cper_sec_mem_err *mem,
int len)
{
struct cper_mem_err_compact cmem;
char rcd_decode_str[CPER_REC_LEN];
/* Don't trust UEFI 2.1/2.2 structure with bad validation bits */
if (len == sizeof(struct cper_sec_mem_err_old) &&
(mem->validation_bits & ~(CPER_MEM_VALID_RANK_NUMBER - 1))) {
pr_err(FW_WARN "valid bits set for fields beyond structure\n");
return;
}
if (mem->validation_bits & CPER_MEM_VALID_ERROR_STATUS)
printk("%s error_status: %s (0x%016llx)\n",
pfx, cper_mem_err_status_str(mem->error_status),
mem->error_status);
if (mem->validation_bits & CPER_MEM_VALID_PA)
printk("%s""physical_address: 0x%016llx\n",
pfx, mem->physical_addr);
if (mem->validation_bits & CPER_MEM_VALID_PA_MASK)
printk("%s""physical_address_mask: 0x%016llx\n",
pfx, mem->physical_addr_mask);
cper_mem_err_pack(mem, &cmem);
if (cper_mem_err_location(&cmem, rcd_decode_str))
printk("%s%s\n", pfx, rcd_decode_str);
if (mem->validation_bits & CPER_MEM_VALID_ERROR_TYPE) {
u8 etype = mem->error_type;
printk("%s""error_type: %d, %s\n", pfx, etype,
cper_mem_err_type_str(etype));
}
if (cper_dimm_err_location(&cmem, rcd_decode_str))
printk("%s%s\n", pfx, rcd_decode_str);
}
static const char * const pcie_port_type_strs[] = {
"PCIe end point",
"legacy PCI end point",
"unknown",
"unknown",
"root port",
"upstream switch port",
"downstream switch port",
"PCIe to PCI/PCI-X bridge",
"PCI/PCI-X to PCIe bridge",
"root complex integrated endpoint device",
"root complex event collector",
};
static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
const struct acpi_hest_generic_data *gdata)
{
if (pcie->validation_bits & CPER_PCIE_VALID_PORT_TYPE)
printk("%s""port_type: %d, %s\n", pfx, pcie->port_type,
pcie->port_type < ARRAY_SIZE(pcie_port_type_strs) ?
pcie_port_type_strs[pcie->port_type] : "unknown");
if (pcie->validation_bits & CPER_PCIE_VALID_VERSION)
printk("%s""version: %d.%d\n", pfx,
pcie->version.major, pcie->version.minor);
if (pcie->validation_bits & CPER_PCIE_VALID_COMMAND_STATUS)
printk("%s""command: 0x%04x, status: 0x%04x\n", pfx,
pcie->command, pcie->status);
if (pcie->validation_bits & CPER_PCIE_VALID_DEVICE_ID) {
const __u8 *p;
printk("%s""device_id: %04x:%02x:%02x.%x\n", pfx,
pcie->device_id.segment, pcie->device_id.bus,
pcie->device_id.device, pcie->device_id.function);
printk("%s""slot: %d\n", pfx,
pcie->device_id.slot >> CPER_PCIE_SLOT_SHIFT);
printk("%s""secondary_bus: 0x%02x\n", pfx,
pcie->device_id.secondary_bus);
printk("%s""vendor_id: 0x%04x, device_id: 0x%04x\n", pfx,
pcie->device_id.vendor_id, pcie->device_id.device_id);
p = pcie->device_id.class_code;
printk("%s""class_code: %02x%02x%02x\n", pfx, p[2], p[1], p[0]);
}
if (pcie->validation_bits & CPER_PCIE_VALID_SERIAL_NUMBER)
printk("%s""serial number: 0x%04x, 0x%04x\n", pfx,
pcie->serial_number.lower, pcie->serial_number.upper);
if (pcie->validation_bits & CPER_PCIE_VALID_BRIDGE_CONTROL_STATUS)
printk(
"%s""bridge: secondary_status: 0x%04x, control: 0x%04x\n",
pfx, pcie->bridge.secondary_status, pcie->bridge.control);
/* Fatal errors call __ghes_panic() before AER handler prints this */
if ((pcie->validation_bits & CPER_PCIE_VALID_AER_INFO) &&
(gdata->error_severity & CPER_SEV_FATAL)) {
struct aer_capability_regs *aer;
aer = (struct aer_capability_regs *)pcie->aer_info;
printk("%saer_uncor_status: 0x%08x, aer_uncor_mask: 0x%08x\n",
pfx, aer->uncor_status, aer->uncor_mask);
printk("%saer_uncor_severity: 0x%08x\n",
pfx, aer->uncor_severity);
printk("%sTLP Header: %08x %08x %08x %08x\n", pfx,
aer->header_log.dw0, aer->header_log.dw1,
aer->header_log.dw2, aer->header_log.dw3);
}
}
static const char * const fw_err_rec_type_strs[] = {
"IPF SAL Error Record",
"SOC Firmware Error Record Type1 (Legacy CrashLog Support)",
"SOC Firmware Error Record Type2",
};
static void cper_print_fw_err(const char *pfx,
struct acpi_hest_generic_data *gdata,
const struct cper_sec_fw_err_rec_ref *fw_err)
{
void *buf = acpi_hest_get_payload(gdata);
u32 offset, length = gdata->error_data_length;
printk("%s""Firmware Error Record Type: %s\n", pfx,
fw_err->record_type < ARRAY_SIZE(fw_err_rec_type_strs) ?
fw_err_rec_type_strs[fw_err->record_type] : "unknown");
printk("%s""Revision: %d\n", pfx, fw_err->revision);
/* Record Type based on UEFI 2.7 */
if (fw_err->revision == 0) {
printk("%s""Record Identifier: %08llx\n", pfx,
fw_err->record_identifier);
} else if (fw_err->revision == 2) {
printk("%s""Record Identifier: %pUl\n", pfx,
&fw_err->record_identifier_guid);
}
/*
* The FW error record may contain trailing data beyond the
* structure defined by the specification. As the fields
* defined (and hence the offset of any trailing data) vary
* with the revision, set the offset to account for this
* variation.
*/
if (fw_err->revision == 0) {
/* record_identifier_guid not defined */
offset = offsetof(struct cper_sec_fw_err_rec_ref,
record_identifier_guid);
} else if (fw_err->revision == 1) {
/* record_identifier not defined */
offset = offsetof(struct cper_sec_fw_err_rec_ref,
record_identifier);
} else {
offset = sizeof(*fw_err);
}
buf += offset;
length -= offset;
print_hex_dump(pfx, "", DUMP_PREFIX_OFFSET, 16, 4, buf, length, true);
}
static void cper_print_tstamp(const char *pfx,
struct acpi_hest_generic_data_v300 *gdata)
{
__u8 hour, min, sec, day, mon, year, century, *timestamp;
if (gdata->validation_bits & ACPI_HEST_GEN_VALID_TIMESTAMP) {
timestamp = (__u8 *)&(gdata->time_stamp);
sec = bcd2bin(timestamp[0]);
min = bcd2bin(timestamp[1]);
hour = bcd2bin(timestamp[2]);
day = bcd2bin(timestamp[4]);
mon = bcd2bin(timestamp[5]);
year = bcd2bin(timestamp[6]);
century = bcd2bin(timestamp[7]);
printk("%s%ststamp: %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx,
(timestamp[3] & 0x1 ? "precise " : "imprecise "),
century, year, mon, day, hour, min, sec);
}
}
static void
cper_estatus_print_section(const char *pfx, struct acpi_hest_generic_data *gdata,
int sec_no)
{
guid_t *sec_type = (guid_t *)gdata->section_type;
__u16 severity;
char newpfx[64];
if (acpi_hest_get_version(gdata) >= 3)
cper_print_tstamp(pfx, (struct acpi_hest_generic_data_v300 *)gdata);
severity = gdata->error_severity;
printk("%s""Error %d, type: %s\n", pfx, sec_no,
cper_severity_str(severity));
if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
printk("%s""fru_id: %pUl\n", pfx, gdata->fru_id);
if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
printk("%s""fru_text: %.20s\n", pfx, gdata->fru_text);
snprintf(newpfx, sizeof(newpfx), "%s ", pfx);
if (guid_equal(sec_type, &CPER_SEC_PROC_GENERIC)) {
struct cper_sec_proc_generic *proc_err = acpi_hest_get_payload(gdata);
printk("%s""section_type: general processor error\n", newpfx);
if (gdata->error_data_length >= sizeof(*proc_err))
cper_print_proc_generic(newpfx, proc_err);
else
goto err_section_too_small;
} else if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) {
struct cper_sec_mem_err *mem_err = acpi_hest_get_payload(gdata);
printk("%s""section_type: memory error\n", newpfx);
if (gdata->error_data_length >=
sizeof(struct cper_sec_mem_err_old))
cper_print_mem(newpfx, mem_err,
gdata->error_data_length);
else
goto err_section_too_small;
} else if (guid_equal(sec_type, &CPER_SEC_PCIE)) {
struct cper_sec_pcie *pcie = acpi_hest_get_payload(gdata);
printk("%s""section_type: PCIe error\n", newpfx);
if (gdata->error_data_length >= sizeof(*pcie))
cper_print_pcie(newpfx, pcie, gdata);
else
goto err_section_too_small;
#if defined(CONFIG_ARM64) || defined(CONFIG_ARM)
} else if (guid_equal(sec_type, &CPER_SEC_PROC_ARM)) {
struct cper_sec_proc_arm *arm_err = acpi_hest_get_payload(gdata);
printk("%ssection_type: ARM processor error\n", newpfx);
if (gdata->error_data_length >= sizeof(*arm_err))
cper_print_proc_arm(newpfx, arm_err);
else
goto err_section_too_small;
#endif
#if defined(CONFIG_UEFI_CPER_X86)
} else if (guid_equal(sec_type, &CPER_SEC_PROC_IA)) {
struct cper_sec_proc_ia *ia_err = acpi_hest_get_payload(gdata);
printk("%ssection_type: IA32/X64 processor error\n", newpfx);
if (gdata->error_data_length >= sizeof(*ia_err))
cper_print_proc_ia(newpfx, ia_err);
else
goto err_section_too_small;
#endif
} else if (guid_equal(sec_type, &CPER_SEC_FW_ERR_REC_REF)) {
struct cper_sec_fw_err_rec_ref *fw_err = acpi_hest_get_payload(gdata);
printk("%ssection_type: Firmware Error Record Reference\n",
newpfx);
/* The minimal FW Error Record contains 16 bytes */
if (gdata->error_data_length >= SZ_16)
cper_print_fw_err(newpfx, gdata, fw_err);
else
goto err_section_too_small;
} else if (guid_equal(sec_type, &CPER_SEC_CXL_PROT_ERR)) {
struct cper_sec_prot_err *prot_err = acpi_hest_get_payload(gdata);
printk("%ssection_type: CXL Protocol Error\n", newpfx);
if (gdata->error_data_length >= sizeof(*prot_err))
cper_print_prot_err(newpfx, prot_err);
else
goto err_section_too_small;
} else {
const void *err = acpi_hest_get_payload(gdata);
printk("%ssection type: unknown, %pUl\n", newpfx, sec_type);
printk("%ssection length: %#x\n", newpfx,
gdata->error_data_length);
print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, 4, err,
gdata->error_data_length, true);
}
return;
err_section_too_small:
pr_err(FW_WARN "error section length is too small\n");
}
void cper_estatus_print(const char *pfx,
const struct acpi_hest_generic_status *estatus)
{
struct acpi_hest_generic_data *gdata;
int sec_no = 0;
char newpfx[64];
__u16 severity;
severity = estatus->error_severity;
if (severity == CPER_SEV_CORRECTED)
printk("%s%s\n", pfx,
"It has been corrected by h/w "
"and requires no further action");
printk("%s""event severity: %s\n", pfx, cper_severity_str(severity));
snprintf(newpfx, sizeof(newpfx), "%s ", pfx);
apei_estatus_for_each_section(estatus, gdata) {
cper_estatus_print_section(newpfx, gdata, sec_no);
sec_no++;
}
}
EXPORT_SYMBOL_GPL(cper_estatus_print);
int cper_estatus_check_header(const struct acpi_hest_generic_status *estatus)
{
if (estatus->data_length &&
estatus->data_length < sizeof(struct acpi_hest_generic_data))
return -EINVAL;
if (estatus->raw_data_length &&
estatus->raw_data_offset < sizeof(*estatus) + estatus->data_length)
return -EINVAL;
return 0;
}
EXPORT_SYMBOL_GPL(cper_estatus_check_header);
int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
{
struct acpi_hest_generic_data *gdata;
unsigned int data_len, record_size;
int rc;
rc = cper_estatus_check_header(estatus);
if (rc)
return rc;
data_len = estatus->data_length;
apei_estatus_for_each_section(estatus, gdata) {
if (acpi_hest_get_size(gdata) > data_len)
return -EINVAL;
record_size = acpi_hest_get_record_size(gdata);
if (record_size > data_len)
return -EINVAL;
data_len -= record_size;
}
if (data_len)
return -EINVAL;
return 0;
}
EXPORT_SYMBOL_GPL(cper_estatus_check);
| linux-master | drivers/firmware/efi/cper.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Generic System Framebuffers
* Copyright (c) 2012-2013 David Herrmann <[email protected]>
*
* EFI Quirks Copyright (c) 2006 Edgar Hucek <[email protected]>
*/
/*
* EFI Quirks
* Several EFI systems do not correctly advertise their boot framebuffers.
* Hence, we use this static table of known broken machines and fix up the
* information so framebuffer drivers can load correctly.
*/
#include <linux/dmi.h>
#include <linux/err.h>
#include <linux/efi.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/of_address.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/screen_info.h>
#include <linux/sysfb.h>
#include <video/vga.h>
enum {
OVERRIDE_NONE = 0x0,
OVERRIDE_BASE = 0x1,
OVERRIDE_STRIDE = 0x2,
OVERRIDE_HEIGHT = 0x4,
OVERRIDE_WIDTH = 0x8,
};
struct efifb_dmi_info efifb_dmi_list[] = {
[M_I17] = { "i17", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
[M_I20] = { "i20", 0x80010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE }, /* guess */
[M_I20_SR] = { "imac7", 0x40010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE },
[M_I24] = { "i24", 0x80010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE }, /* guess */
[M_I24_8_1] = { "imac8", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
[M_I24_10_1] = { "imac10", 0xc0010000, 2048 * 4, 1920, 1080, OVERRIDE_NONE },
[M_I27_11_1] = { "imac11", 0xc0010000, 2560 * 4, 2560, 1440, OVERRIDE_NONE },
[M_MINI]= { "mini", 0x80000000, 2048 * 4, 1024, 768, OVERRIDE_NONE },
[M_MINI_3_1] = { "mini31", 0x40010000, 1024 * 4, 1024, 768, OVERRIDE_NONE },
[M_MINI_4_1] = { "mini41", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
[M_MB] = { "macbook", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
[M_MB_5_1] = { "macbook51", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
[M_MB_6_1] = { "macbook61", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
[M_MB_7_1] = { "macbook71", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
[M_MBA] = { "mba", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
/* 11" Macbook Air 3,1 passes the wrong stride */
[M_MBA_3] = { "mba3", 0, 2048 * 4, 0, 0, OVERRIDE_STRIDE },
[M_MBP] = { "mbp", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
[M_MBP_2] = { "mbp2", 0, 0, 0, 0, OVERRIDE_NONE }, /* placeholder */
[M_MBP_2_2] = { "mbp22", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
[M_MBP_SR] = { "mbp3", 0x80030000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
[M_MBP_4] = { "mbp4", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
[M_MBP_5_1] = { "mbp51", 0xc0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
[M_MBP_5_2] = { "mbp52", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
[M_MBP_5_3] = { "mbp53", 0xd0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
[M_MBP_6_1] = { "mbp61", 0x90030000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
[M_MBP_6_2] = { "mbp62", 0x90030000, 2048 * 4, 1680, 1050, OVERRIDE_NONE },
[M_MBP_7_1] = { "mbp71", 0xc0010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
[M_MBP_8_2] = { "mbp82", 0x90010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
[M_UNKNOWN] = { NULL, 0, 0, 0, 0, OVERRIDE_NONE }
};
void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
{
int i;
for (i = 0; i < M_UNKNOWN; i++) {
if (efifb_dmi_list[i].base != 0 &&
!strcmp(opt, efifb_dmi_list[i].optname)) {
si->lfb_base = efifb_dmi_list[i].base;
si->lfb_linelength = efifb_dmi_list[i].stride;
si->lfb_width = efifb_dmi_list[i].width;
si->lfb_height = efifb_dmi_list[i].height;
}
}
}
#define choose_value(dmivalue, fwvalue, field, flags) ({ \
typeof(fwvalue) _ret_ = fwvalue; \
if ((flags) & (field)) \
_ret_ = dmivalue; \
else if ((fwvalue) == 0) \
_ret_ = dmivalue; \
_ret_; \
})
static int __init efifb_set_system(const struct dmi_system_id *id)
{
struct efifb_dmi_info *info = id->driver_data;
if (info->base == 0 && info->height == 0 && info->width == 0 &&
info->stride == 0)
return 0;
/* Trust the bootloader over the DMI tables */
if (screen_info.lfb_base == 0) {
#if defined(CONFIG_PCI)
struct pci_dev *dev = NULL;
int found_bar = 0;
#endif
if (info->base) {
screen_info.lfb_base = choose_value(info->base,
screen_info.lfb_base, OVERRIDE_BASE,
info->flags);
#if defined(CONFIG_PCI)
/* make sure that the address in the table is actually
* on a VGA device's PCI BAR */
for_each_pci_dev(dev) {
int i;
if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
continue;
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
resource_size_t start, end;
unsigned long flags;
flags = pci_resource_flags(dev, i);
if (!(flags & IORESOURCE_MEM))
continue;
if (flags & IORESOURCE_UNSET)
continue;
if (pci_resource_len(dev, i) == 0)
continue;
start = pci_resource_start(dev, i);
end = pci_resource_end(dev, i);
if (screen_info.lfb_base >= start &&
screen_info.lfb_base < end) {
found_bar = 1;
break;
}
}
}
if (!found_bar)
screen_info.lfb_base = 0;
#endif
}
}
if (screen_info.lfb_base) {
screen_info.lfb_linelength = choose_value(info->stride,
screen_info.lfb_linelength, OVERRIDE_STRIDE,
info->flags);
screen_info.lfb_width = choose_value(info->width,
screen_info.lfb_width, OVERRIDE_WIDTH,
info->flags);
screen_info.lfb_height = choose_value(info->height,
screen_info.lfb_height, OVERRIDE_HEIGHT,
info->flags);
if (screen_info.orig_video_isVGA == 0)
screen_info.orig_video_isVGA = VIDEO_TYPE_EFI;
} else {
screen_info.lfb_linelength = 0;
screen_info.lfb_width = 0;
screen_info.lfb_height = 0;
screen_info.orig_video_isVGA = 0;
return 0;
}
printk(KERN_INFO "efifb: dmi detected %s - framebuffer at 0x%08x "
"(%dx%d, stride %d)\n", id->ident,
screen_info.lfb_base, screen_info.lfb_width,
screen_info.lfb_height, screen_info.lfb_linelength);
return 1;
}
#define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid) \
{ \
efifb_set_system, \
name, \
{ \
DMI_MATCH(DMI_BIOS_VENDOR, vendor), \
DMI_MATCH(DMI_PRODUCT_NAME, name) \
}, \
&efifb_dmi_list[enumid] \
}
static const struct dmi_system_id efifb_dmi_system_table[] __initconst = {
EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac4,1", M_I17),
/* At least one of these two will be right; maybe both? */
EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac5,1", M_I20),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac5,1", M_I20),
/* At least one of these two will be right; maybe both? */
EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac6,1", M_I24),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac6,1", M_I24),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac7,1", M_I20_SR),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac8,1", M_I24_8_1),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac10,1", M_I24_10_1),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac11,1", M_I27_11_1),
EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "Macmini1,1", M_MINI),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini3,1", M_MINI_3_1),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini4,1", M_MINI_4_1),
EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook1,1", M_MB),
/* At least one of these two will be right; maybe both? */
EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook2,1", M_MB),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook2,1", M_MB),
/* At least one of these two will be right; maybe both? */
EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook3,1", M_MB),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook3,1", M_MB),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook4,1", M_MB),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook5,1", M_MB_5_1),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook6,1", M_MB_6_1),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook7,1", M_MB_7_1),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir1,1", M_MBA),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir3,1", M_MBA_3),
EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro1,1", M_MBP),
EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,1", M_MBP_2),
EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,2", M_MBP_2_2),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro2,1", M_MBP_2),
EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro3,1", M_MBP_SR),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro3,1", M_MBP_SR),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro4,1", M_MBP_4),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,1", M_MBP_5_1),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,2", M_MBP_5_2),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,3", M_MBP_5_3),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,1", M_MBP_6_1),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,2", M_MBP_6_2),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro7,1", M_MBP_7_1),
EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro8,2", M_MBP_8_2),
{},
};
/*
* Some devices have a portrait LCD but advertise a landscape resolution (and
* pitch). We simply swap width and height for these devices so that we can
* correctly deal with some of them coming with multiple resolutions.
*/
static const struct dmi_system_id efifb_dmi_swap_width_height[] __initconst = {
{
/*
* Lenovo MIIX310-10ICR, only some batches have the troublesome
* 800x1280 portrait screen. Luckily the portrait version has
* its own BIOS version, so we match on that.
*/
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "MIIX 310-10ICR"),
DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1HCN44WW"),
},
},
{
/* Lenovo MIIX 320-10ICR with 800x1280 portrait screen */
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_EXACT_MATCH(DMI_PRODUCT_VERSION,
"Lenovo MIIX 320-10ICR"),
},
},
{
/* Lenovo D330 with 800x1280 or 1200x1920 portrait screen */
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_EXACT_MATCH(DMI_PRODUCT_VERSION,
"Lenovo ideapad D330-10IGM"),
},
},
{
/* Lenovo IdeaPad Duet 3 10IGL5 with 1200x1920 portrait screen */
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_EXACT_MATCH(DMI_PRODUCT_VERSION,
"IdeaPad Duet 3 10IGL5"),
},
},
{
/* Lenovo Yoga Book X91F / X91L */
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
/* Non exact match to match F + L versions */
DMI_MATCH(DMI_PRODUCT_NAME, "Lenovo YB1-X91"),
},
},
{},
};
static bool efifb_overlaps_pci_range(const struct of_pci_range *range)
{
u64 fb_base = screen_info.lfb_base;
if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
fb_base |= (u64)(unsigned long)screen_info.ext_lfb_base << 32;
return fb_base >= range->cpu_addr &&
fb_base < (range->cpu_addr + range->size);
}
static struct device_node *find_pci_overlap_node(void)
{
struct device_node *np;
for_each_node_by_type(np, "pci") {
struct of_pci_range_parser parser;
struct of_pci_range range;
int err;
err = of_pci_range_parser_init(&parser, np);
if (err) {
pr_warn("of_pci_range_parser_init() failed: %d\n", err);
continue;
}
for_each_of_pci_range(&parser, &range)
if (efifb_overlaps_pci_range(&range))
return np;
}
return NULL;
}
/*
* If the efifb framebuffer is backed by a PCI graphics controller, we have
* to ensure that this relation is expressed using a device link when
* running in DT mode, or the probe order may be reversed, resulting in a
* resource reservation conflict on the memory window that the efifb
* framebuffer steals from the PCIe host bridge.
*/
static int efifb_add_links(struct fwnode_handle *fwnode)
{
struct device_node *sup_np;
sup_np = find_pci_overlap_node();
/*
* If there's no PCI graphics controller backing the efifb, we are
* done here.
*/
if (!sup_np)
return 0;
fwnode_link_add(fwnode, of_fwnode_handle(sup_np));
of_node_put(sup_np);
return 0;
}
static const struct fwnode_operations efifb_fwnode_ops = {
.add_links = efifb_add_links,
};
#ifdef CONFIG_EFI
static struct fwnode_handle efifb_fwnode;
__init void sysfb_apply_efi_quirks(void)
{
if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI ||
!(screen_info.capabilities & VIDEO_CAPABILITY_SKIP_QUIRKS))
dmi_check_system(efifb_dmi_system_table);
if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI &&
dmi_check_system(efifb_dmi_swap_width_height)) {
u16 temp = screen_info.lfb_width;
screen_info.lfb_width = screen_info.lfb_height;
screen_info.lfb_height = temp;
screen_info.lfb_linelength = 4 * screen_info.lfb_width;
}
}
__init void sysfb_set_efifb_fwnode(struct platform_device *pd)
{
if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI && IS_ENABLED(CONFIG_PCI)) {
fwnode_init(&efifb_fwnode, &efifb_fwnode_ops);
pd->dev.fwnode = &efifb_fwnode;
}
}
#endif
| linux-master | drivers/firmware/efi/sysfb_efi.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2013 Intel Corporation; author Matt Fleming
*/
#include <linux/console.h>
#include <linux/efi.h>
#include <linux/font.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/serial_core.h>
#include <linux/screen_info.h>
#include <linux/string.h>
#include <asm/early_ioremap.h>
static const struct console *earlycon_console __initdata;
static const struct font_desc *font;
static u16 cur_line_y, max_line_y;
static u32 efi_x_array[1024];
static u32 efi_x, efi_y;
static u64 fb_base;
static bool fb_wb;
static void *efi_fb;
/*
* EFI earlycon needs to use early_memremap() to map the framebuffer.
* But early_memremap() is not usable for 'earlycon=efifb keep_bootcon',
* memremap() should be used instead. memremap() will be available after
* paging_init() which is earlier than initcall callbacks. Thus adding this
* early initcall function early_efi_map_fb() to map the whole EFI framebuffer.
*/
static int __init efi_earlycon_remap_fb(void)
{
/* bail if there is no bootconsole or it was unregistered already */
if (!earlycon_console || !console_is_registered(earlycon_console))
return 0;
efi_fb = memremap(fb_base, screen_info.lfb_size,
fb_wb ? MEMREMAP_WB : MEMREMAP_WC);
return efi_fb ? 0 : -ENOMEM;
}
early_initcall(efi_earlycon_remap_fb);
static int __init efi_earlycon_unmap_fb(void)
{
/* unmap the bootconsole fb unless keep_bootcon left it registered */
if (efi_fb && !console_is_registered(earlycon_console))
memunmap(efi_fb);
return 0;
}
late_initcall(efi_earlycon_unmap_fb);
static __ref void *efi_earlycon_map(unsigned long start, unsigned long len)
{
pgprot_t fb_prot;
if (efi_fb)
return efi_fb + start;
fb_prot = fb_wb ? PAGE_KERNEL : pgprot_writecombine(PAGE_KERNEL);
return early_memremap_prot(fb_base + start, len, pgprot_val(fb_prot));
}
static __ref void efi_earlycon_unmap(void *addr, unsigned long len)
{
if (efi_fb)
return;
early_memunmap(addr, len);
}
static void efi_earlycon_clear_scanline(unsigned int y)
{
unsigned long *dst;
u16 len;
len = screen_info.lfb_linelength;
dst = efi_earlycon_map(y*len, len);
if (!dst)
return;
memset(dst, 0, len);
efi_earlycon_unmap(dst, len);
}
static void efi_earlycon_scroll_up(void)
{
unsigned long *dst, *src;
u16 maxlen = 0;
u16 len;
u32 i, height;
/* Find the cached maximum x coordinate */
for (i = 0; i < max_line_y; i++) {
if (efi_x_array[i] > maxlen)
maxlen = efi_x_array[i];
}
maxlen *= 4;
len = screen_info.lfb_linelength;
height = screen_info.lfb_height;
for (i = 0; i < height - font->height; i++) {
dst = efi_earlycon_map(i*len, len);
if (!dst)
return;
src = efi_earlycon_map((i + font->height) * len, len);
if (!src) {
efi_earlycon_unmap(dst, len);
return;
}
memmove(dst, src, maxlen);
efi_earlycon_unmap(src, len);
efi_earlycon_unmap(dst, len);
}
}
static void efi_earlycon_write_char(u32 *dst, unsigned char c, unsigned int h)
{
const u32 color_black = 0x00000000;
const u32 color_white = 0x00ffffff;
const u8 *src;
int m, n, bytes;
u8 x;
bytes = BITS_TO_BYTES(font->width);
src = font->data + c * font->height * bytes + h * bytes;
for (m = 0; m < font->width; m++) {
n = m % 8;
x = *(src + m / 8);
if ((x >> (7 - n)) & 1)
*dst = color_white;
else
*dst = color_black;
dst++;
}
}
static void
efi_earlycon_write(struct console *con, const char *str, unsigned int num)
{
struct screen_info *si;
u32 cur_efi_x = efi_x;
unsigned int len;
const char *s;
void *dst;
si = &screen_info;
len = si->lfb_linelength;
while (num) {
unsigned int linemax = (si->lfb_width - efi_x) / font->width;
unsigned int h, count;
count = strnchrnul(str, num, '\n') - str;
if (count > linemax)
count = linemax;
for (h = 0; h < font->height; h++) {
unsigned int n, x;
dst = efi_earlycon_map((efi_y + h) * len, len);
if (!dst)
return;
s = str;
n = count;
x = efi_x;
while (n-- > 0) {
efi_earlycon_write_char(dst + x*4, *s, h);
x += font->width;
s++;
}
efi_earlycon_unmap(dst, len);
}
num -= count;
efi_x += count * font->width;
str += count;
if (num > 0 && *s == '\n') {
cur_efi_x = efi_x;
efi_x = 0;
efi_y += font->height;
str++;
num--;
}
if (efi_x + font->width > si->lfb_width) {
cur_efi_x = efi_x;
efi_x = 0;
efi_y += font->height;
}
if (efi_y + font->height > si->lfb_height) {
u32 i;
efi_x_array[cur_line_y] = cur_efi_x;
cur_line_y = (cur_line_y + 1) % max_line_y;
efi_y -= font->height;
efi_earlycon_scroll_up();
for (i = 0; i < font->height; i++)
efi_earlycon_clear_scanline(efi_y + i);
}
}
}
static bool __initdata fb_probed;
void __init efi_earlycon_reprobe(void)
{
if (fb_probed)
setup_earlycon("efifb");
}
static int __init efi_earlycon_setup(struct earlycon_device *device,
const char *opt)
{
struct screen_info *si;
u16 xres, yres;
u32 i;
fb_wb = opt && !strcmp(opt, "ram");
if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI) {
fb_probed = true;
return -ENODEV;
}
fb_base = screen_info.lfb_base;
if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
fb_base |= (u64)screen_info.ext_lfb_base << 32;
si = &screen_info;
xres = si->lfb_width;
yres = si->lfb_height;
/*
* efi_earlycon_write_char() implicitly assumes a framebuffer with
* 32 bits per pixel.
*/
if (si->lfb_depth != 32)
return -ENODEV;
font = get_default_font(xres, yres, -1, -1);
if (!font)
return -ENODEV;
/* Fill the cache with maximum possible value of x coordinate */
memset32(efi_x_array, rounddown(xres, font->width), ARRAY_SIZE(efi_x_array));
efi_y = rounddown(yres, font->height);
/* Make sure we have cache for the x coordinate for the full screen */
max_line_y = efi_y / font->height + 1;
cur_line_y = 0;
efi_y -= font->height;
for (i = 0; i < (yres - efi_y) / font->height; i++)
efi_earlycon_scroll_up();
device->con->write = efi_earlycon_write;
earlycon_console = device->con;
return 0;
}
EARLYCON_DECLARE(efifb, efi_earlycon_setup);
| linux-master | drivers/firmware/efi/earlycon.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* UEFI Common Platform Error Record (CPER) support for CXL Section.
*
* Copyright (C) 2022 Advanced Micro Devices, Inc.
*
* Author: Smita Koralahalli <[email protected]>
*/
#include <linux/cper.h>
#include "cper_cxl.h"
#define PROT_ERR_VALID_AGENT_TYPE BIT_ULL(0)
#define PROT_ERR_VALID_AGENT_ADDRESS BIT_ULL(1)
#define PROT_ERR_VALID_DEVICE_ID BIT_ULL(2)
#define PROT_ERR_VALID_SERIAL_NUMBER BIT_ULL(3)
#define PROT_ERR_VALID_CAPABILITY BIT_ULL(4)
#define PROT_ERR_VALID_DVSEC BIT_ULL(5)
#define PROT_ERR_VALID_ERROR_LOG BIT_ULL(6)
/* CXL RAS Capability Structure, CXL v3.0 sec 8.2.4.16 */
struct cxl_ras_capability_regs {
u32 uncor_status;
u32 uncor_mask;
u32 uncor_severity;
u32 cor_status;
u32 cor_mask;
u32 cap_control;
u32 header_log[16];
};
static const char * const prot_err_agent_type_strs[] = {
"Restricted CXL Device",
"Restricted CXL Host Downstream Port",
"CXL Device",
"CXL Logical Device",
"CXL Fabric Manager managed Logical Device",
"CXL Root Port",
"CXL Downstream Switch Port",
"CXL Upstream Switch Port",
};
/*
* The layout of the enumeration and the values matches CXL Agent Type
* field in the UEFI 2.10 Section N.2.13,
*/
enum {
RCD, /* Restricted CXL Device */
RCH_DP, /* Restricted CXL Host Downstream Port */
DEVICE, /* CXL Device */
LD, /* CXL Logical Device */
FMLD, /* CXL Fabric Manager managed Logical Device */
RP, /* CXL Root Port */
DSP, /* CXL Downstream Switch Port */
USP, /* CXL Upstream Switch Port */
};
void cper_print_prot_err(const char *pfx, const struct cper_sec_prot_err *prot_err)
{
if (prot_err->valid_bits & PROT_ERR_VALID_AGENT_TYPE)
pr_info("%s agent_type: %d, %s\n", pfx, prot_err->agent_type,
prot_err->agent_type < ARRAY_SIZE(prot_err_agent_type_strs)
? prot_err_agent_type_strs[prot_err->agent_type]
: "unknown");
if (prot_err->valid_bits & PROT_ERR_VALID_AGENT_ADDRESS) {
switch (prot_err->agent_type) {
/*
* According to UEFI 2.10 Section N.2.13, the term CXL Device
* is used to refer to Restricted CXL Device, CXL Device, CXL
* Logical Device or a CXL Fabric Manager Managed Logical
* Device.
*/
case RCD:
case DEVICE:
case LD:
case FMLD:
case RP:
case DSP:
case USP:
pr_info("%s agent_address: %04x:%02x:%02x.%x\n",
pfx, prot_err->agent_addr.segment,
prot_err->agent_addr.bus,
prot_err->agent_addr.device,
prot_err->agent_addr.function);
break;
case RCH_DP:
pr_info("%s rcrb_base_address: 0x%016llx\n", pfx,
prot_err->agent_addr.rcrb_base_addr);
break;
default:
break;
}
}
if (prot_err->valid_bits & PROT_ERR_VALID_DEVICE_ID) {
const __u8 *class_code;
switch (prot_err->agent_type) {
case RCD:
case DEVICE:
case LD:
case FMLD:
case RP:
case DSP:
case USP:
pr_info("%s slot: %d\n", pfx,
prot_err->device_id.slot >> CPER_PCIE_SLOT_SHIFT);
pr_info("%s vendor_id: 0x%04x, device_id: 0x%04x\n",
pfx, prot_err->device_id.vendor_id,
prot_err->device_id.device_id);
pr_info("%s sub_vendor_id: 0x%04x, sub_device_id: 0x%04x\n",
pfx, prot_err->device_id.subsystem_vendor_id,
prot_err->device_id.subsystem_id);
class_code = prot_err->device_id.class_code;
pr_info("%s class_code: %02x%02x\n", pfx,
class_code[1], class_code[0]);
break;
default:
break;
}
}
if (prot_err->valid_bits & PROT_ERR_VALID_SERIAL_NUMBER) {
switch (prot_err->agent_type) {
case RCD:
case DEVICE:
case LD:
case FMLD:
pr_info("%s lower_dw: 0x%08x, upper_dw: 0x%08x\n", pfx,
prot_err->dev_serial_num.lower_dw,
prot_err->dev_serial_num.upper_dw);
break;
default:
break;
}
}
if (prot_err->valid_bits & PROT_ERR_VALID_CAPABILITY) {
switch (prot_err->agent_type) {
case RCD:
case DEVICE:
case LD:
case FMLD:
case RP:
case DSP:
case USP:
print_hex_dump(pfx, "", DUMP_PREFIX_OFFSET, 16, 4,
prot_err->capability,
sizeof(prot_err->capability), 0);
break;
default:
break;
}
}
if (prot_err->valid_bits & PROT_ERR_VALID_DVSEC) {
pr_info("%s DVSEC length: 0x%04x\n", pfx, prot_err->dvsec_len);
pr_info("%s CXL DVSEC:\n", pfx);
print_hex_dump(pfx, "", DUMP_PREFIX_OFFSET, 16, 4, (prot_err + 1),
prot_err->dvsec_len, 0);
}
if (prot_err->valid_bits & PROT_ERR_VALID_ERROR_LOG) {
size_t size = sizeof(*prot_err) + prot_err->dvsec_len;
struct cxl_ras_capability_regs *cxl_ras;
pr_info("%s Error log length: 0x%04x\n", pfx, prot_err->err_len);
pr_info("%s CXL Error Log:\n", pfx);
cxl_ras = (struct cxl_ras_capability_regs *)((long)prot_err + size);
pr_info("%s cxl_ras_uncor_status: 0x%08x", pfx,
cxl_ras->uncor_status);
pr_info("%s cxl_ras_uncor_mask: 0x%08x\n", pfx,
cxl_ras->uncor_mask);
pr_info("%s cxl_ras_uncor_severity: 0x%08x\n", pfx,
cxl_ras->uncor_severity);
pr_info("%s cxl_ras_cor_status: 0x%08x", pfx,
cxl_ras->cor_status);
pr_info("%s cxl_ras_cor_mask: 0x%08x\n", pfx,
cxl_ras->cor_mask);
pr_info("%s cap_control: 0x%08x\n", pfx,
cxl_ras->cap_control);
pr_info("%s Header Log Registers:\n", pfx);
print_hex_dump(pfx, "", DUMP_PREFIX_OFFSET, 16, 4, cxl_ras->header_log,
sizeof(cxl_ras->header_log), 0);
}
}
| linux-master | drivers/firmware/efi/cper_cxl.c |
// SPDX-License-Identifier: GPL-2.0+
#include <linux/efi.h>
#include <linux/module.h>
#include <linux/pstore.h>
#include <linux/slab.h>
#include <linux/ucs2_string.h>
MODULE_IMPORT_NS(EFIVAR);
#define DUMP_NAME_LEN 66
static unsigned int record_size = 1024;
module_param(record_size, uint, 0444);
MODULE_PARM_DESC(record_size, "size of each pstore UEFI var (in bytes, min/default=1024)");
static bool efivars_pstore_disable =
IS_ENABLED(CONFIG_EFI_VARS_PSTORE_DEFAULT_DISABLE);
module_param_named(pstore_disable, efivars_pstore_disable, bool, 0644);
#define PSTORE_EFI_ATTRIBUTES \
(EFI_VARIABLE_NON_VOLATILE | \
EFI_VARIABLE_BOOTSERVICE_ACCESS | \
EFI_VARIABLE_RUNTIME_ACCESS)
static int efi_pstore_open(struct pstore_info *psi)
{
int err;
err = efivar_lock();
if (err)
return err;
psi->data = kzalloc(record_size, GFP_KERNEL);
if (!psi->data)
return -ENOMEM;
return 0;
}
static int efi_pstore_close(struct pstore_info *psi)
{
efivar_unlock();
kfree(psi->data);
return 0;
}
static inline u64 generic_id(u64 timestamp, unsigned int part, int count)
{
return (timestamp * 100 + part) * 1000 + count;
}
static int efi_pstore_read_func(struct pstore_record *record,
efi_char16_t *varname)
{
unsigned long wlen, size = record_size;
char name[DUMP_NAME_LEN], data_type;
efi_status_t status;
int cnt;
unsigned int part;
u64 time;
ucs2_as_utf8(name, varname, DUMP_NAME_LEN);
if (sscanf(name, "dump-type%u-%u-%d-%llu-%c",
&record->type, &part, &cnt, &time, &data_type) == 5) {
record->id = generic_id(time, part, cnt);
record->part = part;
record->count = cnt;
record->time.tv_sec = time;
record->time.tv_nsec = 0;
if (data_type == 'C')
record->compressed = true;
else
record->compressed = false;
record->ecc_notice_size = 0;
} else if (sscanf(name, "dump-type%u-%u-%d-%llu",
&record->type, &part, &cnt, &time) == 4) {
record->id = generic_id(time, part, cnt);
record->part = part;
record->count = cnt;
record->time.tv_sec = time;
record->time.tv_nsec = 0;
record->compressed = false;
record->ecc_notice_size = 0;
} else if (sscanf(name, "dump-type%u-%u-%llu",
&record->type, &part, &time) == 3) {
/*
* Check if an old format,
* which doesn't support holding
* multiple logs, remains.
*/
record->id = generic_id(time, part, 0);
record->part = part;
record->count = 0;
record->time.tv_sec = time;
record->time.tv_nsec = 0;
record->compressed = false;
record->ecc_notice_size = 0;
} else
return 0;
record->buf = kmalloc(size, GFP_KERNEL);
if (!record->buf)
return -ENOMEM;
status = efivar_get_variable(varname, &LINUX_EFI_CRASH_GUID, NULL,
&size, record->buf);
if (status != EFI_SUCCESS) {
kfree(record->buf);
return -EIO;
}
/*
* Store the name of the variable in the pstore_record priv field, so
* we can reuse it later if we need to delete the EFI variable from the
* variable store.
*/
wlen = (ucs2_strnlen(varname, DUMP_NAME_LEN) + 1) * sizeof(efi_char16_t);
record->priv = kmemdup(varname, wlen, GFP_KERNEL);
if (!record->priv) {
kfree(record->buf);
return -ENOMEM;
}
return size;
}
static ssize_t efi_pstore_read(struct pstore_record *record)
{
efi_char16_t *varname = record->psi->data;
efi_guid_t guid = LINUX_EFI_CRASH_GUID;
unsigned long varname_size;
efi_status_t status;
for (;;) {
varname_size = 1024;
/*
* If this is the first read() call in the pstore enumeration,
* varname will be the empty string, and the GetNextVariable()
* runtime service call will return the first EFI variable in
* its own enumeration order, ignoring the guid argument.
*
* Subsequent calls to GetNextVariable() must pass the name and
* guid values returned by the previous call, which is why we
* store varname in record->psi->data. Given that we only
* enumerate variables with the efi-pstore GUID, there is no
* need to record the guid return value.
*/
status = efivar_get_next_variable(&varname_size, varname, &guid);
if (status == EFI_NOT_FOUND)
return 0;
if (status != EFI_SUCCESS)
return -EIO;
/* skip variables that don't concern us */
if (efi_guidcmp(guid, LINUX_EFI_CRASH_GUID))
continue;
return efi_pstore_read_func(record, varname);
}
}
static int efi_pstore_write(struct pstore_record *record)
{
char name[DUMP_NAME_LEN];
efi_char16_t efi_name[DUMP_NAME_LEN];
efi_status_t status;
int i;
record->id = generic_id(record->time.tv_sec, record->part,
record->count);
/* Since we copy the entire length of name, make sure it is wiped. */
memset(name, 0, sizeof(name));
snprintf(name, sizeof(name), "dump-type%u-%u-%d-%lld-%c",
record->type, record->part, record->count,
(long long)record->time.tv_sec,
record->compressed ? 'C' : 'D');
for (i = 0; i < DUMP_NAME_LEN; i++)
efi_name[i] = name[i];
if (efivar_trylock())
return -EBUSY;
status = efivar_set_variable_locked(efi_name, &LINUX_EFI_CRASH_GUID,
PSTORE_EFI_ATTRIBUTES,
record->size, record->psi->buf,
true);
efivar_unlock();
return status == EFI_SUCCESS ? 0 : -EIO;
};
static int efi_pstore_erase(struct pstore_record *record)
{
efi_status_t status;
status = efivar_set_variable(record->priv, &LINUX_EFI_CRASH_GUID,
PSTORE_EFI_ATTRIBUTES, 0, NULL);
if (status != EFI_SUCCESS && status != EFI_NOT_FOUND)
return -EIO;
return 0;
}
static struct pstore_info efi_pstore_info = {
.owner = THIS_MODULE,
.name = KBUILD_MODNAME,
.flags = PSTORE_FLAGS_DMESG,
.open = efi_pstore_open,
.close = efi_pstore_close,
.read = efi_pstore_read,
.write = efi_pstore_write,
.erase = efi_pstore_erase,
};
static __init int efivars_pstore_init(void)
{
if (!efivar_supports_writes())
return 0;
if (efivars_pstore_disable)
return 0;
/*
* Notice that 1024 is the minimum here to prevent issues with
* decompression algorithms that were spotted during tests;
* even in the case of not using compression, smaller values would
* just pollute more the pstore FS with many small collected files.
*/
if (record_size < 1024)
record_size = 1024;
efi_pstore_info.buf = kmalloc(record_size, GFP_KERNEL);
if (!efi_pstore_info.buf)
return -ENOMEM;
efi_pstore_info.bufsize = record_size;
if (pstore_register(&efi_pstore_info)) {
kfree(efi_pstore_info.buf);
efi_pstore_info.buf = NULL;
efi_pstore_info.bufsize = 0;
}
return 0;
}
static __exit void efivars_pstore_exit(void)
{
if (!efi_pstore_info.bufsize)
return;
pstore_unregister(&efi_pstore_info);
kfree(efi_pstore_info.buf);
efi_pstore_info.buf = NULL;
efi_pstore_info.bufsize = 0;
}
module_init(efivars_pstore_init);
module_exit(efivars_pstore_exit);
MODULE_DESCRIPTION("EFI variable backend for pstore");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:efivars");
| linux-master | drivers/firmware/efi/efi-pstore.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2012 Intel Corporation
* Author: Josh Triplett <[email protected]>
*
* Based on the bgrt driver:
* Copyright 2012 Red Hat, Inc <[email protected]>
* Author: Matthew Garrett
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/efi.h>
#include <linux/efi-bgrt.h>
struct acpi_table_bgrt bgrt_tab;
size_t bgrt_image_size;
struct bmp_header {
u16 id;
u32 size;
} __packed;
void __init efi_bgrt_init(struct acpi_table_header *table)
{
void *image;
struct bmp_header bmp_header;
struct acpi_table_bgrt *bgrt = &bgrt_tab;
if (acpi_disabled)
return;
if (!efi_enabled(EFI_MEMMAP))
return;
if (table->length < sizeof(bgrt_tab)) {
pr_notice("Ignoring BGRT: invalid length %u (expected %zu)\n",
table->length, sizeof(bgrt_tab));
return;
}
*bgrt = *(struct acpi_table_bgrt *)table;
/*
* Only version 1 is defined but some older laptops (seen on Lenovo
* Ivy Bridge models) have a correct version 1 BGRT table with the
* version set to 0, so we accept version 0 and 1.
*/
if (bgrt->version > 1) {
pr_notice("Ignoring BGRT: invalid version %u (expected 1)\n",
bgrt->version);
goto out;
}
if (bgrt->image_type != 0) {
pr_notice("Ignoring BGRT: invalid image type %u (expected 0)\n",
bgrt->image_type);
goto out;
}
if (!bgrt->image_address) {
pr_notice("Ignoring BGRT: null image address\n");
goto out;
}
if (efi_mem_type(bgrt->image_address) != EFI_BOOT_SERVICES_DATA) {
pr_notice("Ignoring BGRT: invalid image address\n");
goto out;
}
image = early_memremap(bgrt->image_address, sizeof(bmp_header));
if (!image) {
pr_notice("Ignoring BGRT: failed to map image header memory\n");
goto out;
}
memcpy(&bmp_header, image, sizeof(bmp_header));
early_memunmap(image, sizeof(bmp_header));
if (bmp_header.id != 0x4d42) {
pr_notice("Ignoring BGRT: Incorrect BMP magic number 0x%x (expected 0x4d42)\n",
bmp_header.id);
goto out;
}
bgrt_image_size = bmp_header.size;
efi_mem_reserve(bgrt->image_address, bgrt_image_size);
return;
out:
memset(bgrt, 0, sizeof(bgrt_tab));
}
| linux-master | drivers/firmware/efi/efi-bgrt.c |
// SPDX-License-Identifier: GPL-2.0+
/*
* EFI Test Driver for Runtime Services
*
* Copyright(C) 2012-2016 Canonical Ltd.
*
* This driver exports EFI runtime services interfaces into userspace, which
* allow to use and test UEFI runtime services provided by firmware.
*
*/
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/efi.h>
#include <linux/security.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include "efi_test.h"
MODULE_AUTHOR("Ivan Hu <[email protected]>");
MODULE_DESCRIPTION("EFI Test Driver");
MODULE_LICENSE("GPL");
/*
* Count the bytes in 'str', including the terminating NULL.
*
* Note this function returns the number of *bytes*, not the number of
* ucs2 characters.
*/
static inline size_t user_ucs2_strsize(efi_char16_t __user *str)
{
efi_char16_t *s = str, c;
size_t len;
if (!str)
return 0;
/* Include terminating NULL */
len = sizeof(efi_char16_t);
if (get_user(c, s++)) {
/* Can't read userspace memory for size */
return 0;
}
while (c != 0) {
if (get_user(c, s++)) {
/* Can't read userspace memory for size */
return 0;
}
len += sizeof(efi_char16_t);
}
return len;
}
/*
* Allocate a buffer and copy a ucs2 string from user space into it.
*/
static inline int
copy_ucs2_from_user_len(efi_char16_t **dst, efi_char16_t __user *src,
size_t len)
{
efi_char16_t *buf;
if (!src) {
*dst = NULL;
return 0;
}
buf = memdup_user(src, len);
if (IS_ERR(buf)) {
*dst = NULL;
return PTR_ERR(buf);
}
*dst = buf;
return 0;
}
/*
* Count the bytes in 'str', including the terminating NULL.
*
* Just a wrap for user_ucs2_strsize
*/
static inline int
get_ucs2_strsize_from_user(efi_char16_t __user *src, size_t *len)
{
*len = user_ucs2_strsize(src);
if (*len == 0)
return -EFAULT;
return 0;
}
/*
* Calculate the required buffer allocation size and copy a ucs2 string
* from user space into it.
*
* This function differs from copy_ucs2_from_user_len() because it
* calculates the size of the buffer to allocate by taking the length of
* the string 'src'.
*
* If a non-zero value is returned, the caller MUST NOT access 'dst'.
*
* It is the caller's responsibility to free 'dst'.
*/
static inline int
copy_ucs2_from_user(efi_char16_t **dst, efi_char16_t __user *src)
{
size_t len;
len = user_ucs2_strsize(src);
if (len == 0)
return -EFAULT;
return copy_ucs2_from_user_len(dst, src, len);
}
/*
* Copy a ucs2 string to a user buffer.
*
* This function is a simple wrapper around copy_to_user() that does
* nothing if 'src' is NULL, which is useful for reducing the amount of
* NULL checking the caller has to do.
*
* 'len' specifies the number of bytes to copy.
*/
static inline int
copy_ucs2_to_user_len(efi_char16_t __user *dst, efi_char16_t *src, size_t len)
{
if (!src)
return 0;
return copy_to_user(dst, src, len);
}
static long efi_runtime_get_variable(unsigned long arg)
{
struct efi_getvariable __user *getvariable_user;
struct efi_getvariable getvariable;
unsigned long datasize = 0, prev_datasize, *dz;
efi_guid_t vendor_guid, *vd = NULL;
efi_status_t status;
efi_char16_t *name = NULL;
u32 attr, *at;
void *data = NULL;
int rv = 0;
getvariable_user = (struct efi_getvariable __user *)arg;
if (copy_from_user(&getvariable, getvariable_user,
sizeof(getvariable)))
return -EFAULT;
if (getvariable.data_size &&
get_user(datasize, getvariable.data_size))
return -EFAULT;
if (getvariable.vendor_guid) {
if (copy_from_user(&vendor_guid, getvariable.vendor_guid,
sizeof(vendor_guid)))
return -EFAULT;
vd = &vendor_guid;
}
if (getvariable.variable_name) {
rv = copy_ucs2_from_user(&name, getvariable.variable_name);
if (rv)
return rv;
}
at = getvariable.attributes ? &attr : NULL;
dz = getvariable.data_size ? &datasize : NULL;
if (getvariable.data_size && getvariable.data) {
data = kmalloc(datasize, GFP_KERNEL);
if (!data) {
kfree(name);
return -ENOMEM;
}
}
prev_datasize = datasize;
status = efi.get_variable(name, vd, at, dz, data);
kfree(name);
if (put_user(status, getvariable.status)) {
rv = -EFAULT;
goto out;
}
if (status != EFI_SUCCESS) {
if (status == EFI_BUFFER_TOO_SMALL) {
if (dz && put_user(datasize, getvariable.data_size)) {
rv = -EFAULT;
goto out;
}
}
rv = -EINVAL;
goto out;
}
if (prev_datasize < datasize) {
rv = -EINVAL;
goto out;
}
if (data) {
if (copy_to_user(getvariable.data, data, datasize)) {
rv = -EFAULT;
goto out;
}
}
if (at && put_user(attr, getvariable.attributes)) {
rv = -EFAULT;
goto out;
}
if (dz && put_user(datasize, getvariable.data_size))
rv = -EFAULT;
out:
kfree(data);
return rv;
}
static long efi_runtime_set_variable(unsigned long arg)
{
struct efi_setvariable __user *setvariable_user;
struct efi_setvariable setvariable;
efi_guid_t vendor_guid;
efi_status_t status;
efi_char16_t *name = NULL;
void *data;
int rv = 0;
setvariable_user = (struct efi_setvariable __user *)arg;
if (copy_from_user(&setvariable, setvariable_user, sizeof(setvariable)))
return -EFAULT;
if (copy_from_user(&vendor_guid, setvariable.vendor_guid,
sizeof(vendor_guid)))
return -EFAULT;
if (setvariable.variable_name) {
rv = copy_ucs2_from_user(&name, setvariable.variable_name);
if (rv)
return rv;
}
data = memdup_user(setvariable.data, setvariable.data_size);
if (IS_ERR(data)) {
kfree(name);
return PTR_ERR(data);
}
status = efi.set_variable(name, &vendor_guid,
setvariable.attributes,
setvariable.data_size, data);
if (put_user(status, setvariable.status)) {
rv = -EFAULT;
goto out;
}
rv = status == EFI_SUCCESS ? 0 : -EINVAL;
out:
kfree(data);
kfree(name);
return rv;
}
static long efi_runtime_get_time(unsigned long arg)
{
struct efi_gettime __user *gettime_user;
struct efi_gettime gettime;
efi_status_t status;
efi_time_cap_t cap;
efi_time_t efi_time;
gettime_user = (struct efi_gettime __user *)arg;
if (copy_from_user(&gettime, gettime_user, sizeof(gettime)))
return -EFAULT;
status = efi.get_time(gettime.time ? &efi_time : NULL,
gettime.capabilities ? &cap : NULL);
if (put_user(status, gettime.status))
return -EFAULT;
if (status != EFI_SUCCESS)
return -EINVAL;
if (gettime.capabilities) {
efi_time_cap_t __user *cap_local;
cap_local = (efi_time_cap_t *)gettime.capabilities;
if (put_user(cap.resolution, &(cap_local->resolution)) ||
put_user(cap.accuracy, &(cap_local->accuracy)) ||
put_user(cap.sets_to_zero, &(cap_local->sets_to_zero)))
return -EFAULT;
}
if (gettime.time) {
if (copy_to_user(gettime.time, &efi_time, sizeof(efi_time_t)))
return -EFAULT;
}
return 0;
}
static long efi_runtime_set_time(unsigned long arg)
{
struct efi_settime __user *settime_user;
struct efi_settime settime;
efi_status_t status;
efi_time_t efi_time;
settime_user = (struct efi_settime __user *)arg;
if (copy_from_user(&settime, settime_user, sizeof(settime)))
return -EFAULT;
if (copy_from_user(&efi_time, settime.time,
sizeof(efi_time_t)))
return -EFAULT;
status = efi.set_time(&efi_time);
if (put_user(status, settime.status))
return -EFAULT;
return status == EFI_SUCCESS ? 0 : -EINVAL;
}
static long efi_runtime_get_waketime(unsigned long arg)
{
struct efi_getwakeuptime __user *getwakeuptime_user;
struct efi_getwakeuptime getwakeuptime;
efi_bool_t enabled, pending;
efi_status_t status;
efi_time_t efi_time;
getwakeuptime_user = (struct efi_getwakeuptime __user *)arg;
if (copy_from_user(&getwakeuptime, getwakeuptime_user,
sizeof(getwakeuptime)))
return -EFAULT;
status = efi.get_wakeup_time(
getwakeuptime.enabled ? (efi_bool_t *)&enabled : NULL,
getwakeuptime.pending ? (efi_bool_t *)&pending : NULL,
getwakeuptime.time ? &efi_time : NULL);
if (put_user(status, getwakeuptime.status))
return -EFAULT;
if (status != EFI_SUCCESS)
return -EINVAL;
if (getwakeuptime.enabled && put_user(enabled,
getwakeuptime.enabled))
return -EFAULT;
if (getwakeuptime.time) {
if (copy_to_user(getwakeuptime.time, &efi_time,
sizeof(efi_time_t)))
return -EFAULT;
}
return 0;
}
static long efi_runtime_set_waketime(unsigned long arg)
{
struct efi_setwakeuptime __user *setwakeuptime_user;
struct efi_setwakeuptime setwakeuptime;
efi_bool_t enabled;
efi_status_t status;
efi_time_t efi_time;
setwakeuptime_user = (struct efi_setwakeuptime __user *)arg;
if (copy_from_user(&setwakeuptime, setwakeuptime_user,
sizeof(setwakeuptime)))
return -EFAULT;
enabled = setwakeuptime.enabled;
if (setwakeuptime.time) {
if (copy_from_user(&efi_time, setwakeuptime.time,
sizeof(efi_time_t)))
return -EFAULT;
status = efi.set_wakeup_time(enabled, &efi_time);
} else
status = efi.set_wakeup_time(enabled, NULL);
if (put_user(status, setwakeuptime.status))
return -EFAULT;
return status == EFI_SUCCESS ? 0 : -EINVAL;
}
static long efi_runtime_get_nextvariablename(unsigned long arg)
{
struct efi_getnextvariablename __user *getnextvariablename_user;
struct efi_getnextvariablename getnextvariablename;
unsigned long name_size, prev_name_size = 0, *ns = NULL;
efi_status_t status;
efi_guid_t *vd = NULL;
efi_guid_t vendor_guid;
efi_char16_t *name = NULL;
int rv = 0;
getnextvariablename_user = (struct efi_getnextvariablename __user *)arg;
if (copy_from_user(&getnextvariablename, getnextvariablename_user,
sizeof(getnextvariablename)))
return -EFAULT;
if (getnextvariablename.variable_name_size) {
if (get_user(name_size, getnextvariablename.variable_name_size))
return -EFAULT;
ns = &name_size;
prev_name_size = name_size;
}
if (getnextvariablename.vendor_guid) {
if (copy_from_user(&vendor_guid,
getnextvariablename.vendor_guid,
sizeof(vendor_guid)))
return -EFAULT;
vd = &vendor_guid;
}
if (getnextvariablename.variable_name) {
size_t name_string_size = 0;
rv = get_ucs2_strsize_from_user(
getnextvariablename.variable_name,
&name_string_size);
if (rv)
return rv;
/*
* The name_size may be smaller than the real buffer size where
* variable name located in some use cases. The most typical
* case is passing a 0 to get the required buffer size for the
* 1st time call. So we need to copy the content from user
* space for at least the string size of variable name, or else
* the name passed to UEFI may not be terminated as we expected.
*/
rv = copy_ucs2_from_user_len(&name,
getnextvariablename.variable_name,
prev_name_size > name_string_size ?
prev_name_size : name_string_size);
if (rv)
return rv;
}
status = efi.get_next_variable(ns, name, vd);
if (put_user(status, getnextvariablename.status)) {
rv = -EFAULT;
goto out;
}
if (status != EFI_SUCCESS) {
if (status == EFI_BUFFER_TOO_SMALL) {
if (ns && put_user(*ns,
getnextvariablename.variable_name_size)) {
rv = -EFAULT;
goto out;
}
}
rv = -EINVAL;
goto out;
}
if (name) {
if (copy_ucs2_to_user_len(getnextvariablename.variable_name,
name, prev_name_size)) {
rv = -EFAULT;
goto out;
}
}
if (ns) {
if (put_user(*ns, getnextvariablename.variable_name_size)) {
rv = -EFAULT;
goto out;
}
}
if (vd) {
if (copy_to_user(getnextvariablename.vendor_guid, vd,
sizeof(efi_guid_t)))
rv = -EFAULT;
}
out:
kfree(name);
return rv;
}
static long efi_runtime_get_nexthighmonocount(unsigned long arg)
{
struct efi_getnexthighmonotoniccount __user *getnexthighmonocount_user;
struct efi_getnexthighmonotoniccount getnexthighmonocount;
efi_status_t status;
u32 count;
getnexthighmonocount_user = (struct
efi_getnexthighmonotoniccount __user *)arg;
if (copy_from_user(&getnexthighmonocount,
getnexthighmonocount_user,
sizeof(getnexthighmonocount)))
return -EFAULT;
status = efi.get_next_high_mono_count(
getnexthighmonocount.high_count ? &count : NULL);
if (put_user(status, getnexthighmonocount.status))
return -EFAULT;
if (status != EFI_SUCCESS)
return -EINVAL;
if (getnexthighmonocount.high_count &&
put_user(count, getnexthighmonocount.high_count))
return -EFAULT;
return 0;
}
static long efi_runtime_reset_system(unsigned long arg)
{
struct efi_resetsystem __user *resetsystem_user;
struct efi_resetsystem resetsystem;
void *data = NULL;
resetsystem_user = (struct efi_resetsystem __user *)arg;
if (copy_from_user(&resetsystem, resetsystem_user,
sizeof(resetsystem)))
return -EFAULT;
if (resetsystem.data_size != 0) {
data = memdup_user((void *)resetsystem.data,
resetsystem.data_size);
if (IS_ERR(data))
return PTR_ERR(data);
}
efi.reset_system(resetsystem.reset_type, resetsystem.status,
resetsystem.data_size, (efi_char16_t *)data);
kfree(data);
return 0;
}
static long efi_runtime_query_variableinfo(unsigned long arg)
{
struct efi_queryvariableinfo __user *queryvariableinfo_user;
struct efi_queryvariableinfo queryvariableinfo;
efi_status_t status;
u64 max_storage, remaining, max_size;
queryvariableinfo_user = (struct efi_queryvariableinfo __user *)arg;
if (copy_from_user(&queryvariableinfo, queryvariableinfo_user,
sizeof(queryvariableinfo)))
return -EFAULT;
status = efi.query_variable_info(queryvariableinfo.attributes,
&max_storage, &remaining, &max_size);
if (put_user(status, queryvariableinfo.status))
return -EFAULT;
if (status != EFI_SUCCESS)
return -EINVAL;
if (put_user(max_storage,
queryvariableinfo.maximum_variable_storage_size))
return -EFAULT;
if (put_user(remaining,
queryvariableinfo.remaining_variable_storage_size))
return -EFAULT;
if (put_user(max_size, queryvariableinfo.maximum_variable_size))
return -EFAULT;
return 0;
}
static long efi_runtime_query_capsulecaps(unsigned long arg)
{
struct efi_querycapsulecapabilities __user *qcaps_user;
struct efi_querycapsulecapabilities qcaps;
efi_capsule_header_t *capsules;
efi_status_t status;
u64 max_size;
int i, reset_type;
int rv = 0;
qcaps_user = (struct efi_querycapsulecapabilities __user *)arg;
if (copy_from_user(&qcaps, qcaps_user, sizeof(qcaps)))
return -EFAULT;
if (qcaps.capsule_count == ULONG_MAX)
return -EINVAL;
capsules = kcalloc(qcaps.capsule_count + 1,
sizeof(efi_capsule_header_t), GFP_KERNEL);
if (!capsules)
return -ENOMEM;
for (i = 0; i < qcaps.capsule_count; i++) {
efi_capsule_header_t *c;
/*
* We cannot dereference qcaps.capsule_header_array directly to
* obtain the address of the capsule as it resides in the
* user space
*/
if (get_user(c, qcaps.capsule_header_array + i)) {
rv = -EFAULT;
goto out;
}
if (copy_from_user(&capsules[i], c,
sizeof(efi_capsule_header_t))) {
rv = -EFAULT;
goto out;
}
}
qcaps.capsule_header_array = &capsules;
status = efi.query_capsule_caps((efi_capsule_header_t **)
qcaps.capsule_header_array,
qcaps.capsule_count,
&max_size, &reset_type);
if (put_user(status, qcaps.status)) {
rv = -EFAULT;
goto out;
}
if (status != EFI_SUCCESS) {
rv = -EINVAL;
goto out;
}
if (put_user(max_size, qcaps.maximum_capsule_size)) {
rv = -EFAULT;
goto out;
}
if (put_user(reset_type, qcaps.reset_type))
rv = -EFAULT;
out:
kfree(capsules);
return rv;
}
static long efi_runtime_get_supported_mask(unsigned long arg)
{
unsigned int __user *supported_mask;
int rv = 0;
supported_mask = (unsigned int *)arg;
if (put_user(efi.runtime_supported_mask, supported_mask))
rv = -EFAULT;
return rv;
}
static long efi_test_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
switch (cmd) {
case EFI_RUNTIME_GET_VARIABLE:
return efi_runtime_get_variable(arg);
case EFI_RUNTIME_SET_VARIABLE:
return efi_runtime_set_variable(arg);
case EFI_RUNTIME_GET_TIME:
return efi_runtime_get_time(arg);
case EFI_RUNTIME_SET_TIME:
return efi_runtime_set_time(arg);
case EFI_RUNTIME_GET_WAKETIME:
return efi_runtime_get_waketime(arg);
case EFI_RUNTIME_SET_WAKETIME:
return efi_runtime_set_waketime(arg);
case EFI_RUNTIME_GET_NEXTVARIABLENAME:
return efi_runtime_get_nextvariablename(arg);
case EFI_RUNTIME_GET_NEXTHIGHMONOTONICCOUNT:
return efi_runtime_get_nexthighmonocount(arg);
case EFI_RUNTIME_QUERY_VARIABLEINFO:
return efi_runtime_query_variableinfo(arg);
case EFI_RUNTIME_QUERY_CAPSULECAPABILITIES:
return efi_runtime_query_capsulecaps(arg);
case EFI_RUNTIME_RESET_SYSTEM:
return efi_runtime_reset_system(arg);
case EFI_RUNTIME_GET_SUPPORTED_MASK:
return efi_runtime_get_supported_mask(arg);
}
return -ENOTTY;
}
static int efi_test_open(struct inode *inode, struct file *file)
{
int ret = security_locked_down(LOCKDOWN_EFI_TEST);
if (ret)
return ret;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
/*
* nothing special to do here
* We do accept multiple open files at the same time as we
* synchronize on the per call operation.
*/
return 0;
}
static int efi_test_close(struct inode *inode, struct file *file)
{
return 0;
}
/*
* The various file operations we support.
*/
static const struct file_operations efi_test_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = efi_test_ioctl,
.open = efi_test_open,
.release = efi_test_close,
.llseek = no_llseek,
};
static struct miscdevice efi_test_dev = {
MISC_DYNAMIC_MINOR,
"efi_test",
&efi_test_fops
};
static int __init efi_test_init(void)
{
int ret;
ret = misc_register(&efi_test_dev);
if (ret) {
pr_err("efi_test: can't misc_register on minor=%d\n",
MISC_DYNAMIC_MINOR);
return ret;
}
return 0;
}
static void __exit efi_test_exit(void)
{
misc_deregister(&efi_test_dev);
}
module_init(efi_test_init);
module_exit(efi_test_exit);
| linux-master | drivers/firmware/efi/test/efi_test.c |
// SPDX-License-Identifier: GPL-2.0-only
/* -----------------------------------------------------------------------
*
* Copyright 2011 Intel Corporation; author Matt Fleming
*
* ----------------------------------------------------------------------- */
#include <linux/efi.h>
#include <linux/pci.h>
#include <linux/stddef.h>
#include <asm/efi.h>
#include <asm/e820/types.h>
#include <asm/setup.h>
#include <asm/desc.h>
#include <asm/boot.h>
#include <asm/kaslr.h>
#include <asm/sev.h>
#include "efistub.h"
#include "x86-stub.h"
const efi_system_table_t *efi_system_table;
const efi_dxe_services_table_t *efi_dxe_table;
static efi_loaded_image_t *image = NULL;
static efi_memory_attribute_protocol_t *memattr;
typedef union sev_memory_acceptance_protocol sev_memory_acceptance_protocol_t;
union sev_memory_acceptance_protocol {
struct {
efi_status_t (__efiapi * allow_unaccepted_memory)(
sev_memory_acceptance_protocol_t *);
};
struct {
u32 allow_unaccepted_memory;
} mixed_mode;
};
static efi_status_t
preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom)
{
struct pci_setup_rom *rom = NULL;
efi_status_t status;
unsigned long size;
uint64_t romsize;
void *romimage;
/*
* Some firmware images contain EFI function pointers at the place where
* the romimage and romsize fields are supposed to be. Typically the EFI
* code is mapped at high addresses, translating to an unrealistically
* large romsize. The UEFI spec limits the size of option ROMs to 16
* MiB so we reject any ROMs over 16 MiB in size to catch this.
*/
romimage = efi_table_attr(pci, romimage);
romsize = efi_table_attr(pci, romsize);
if (!romimage || !romsize || romsize > SZ_16M)
return EFI_INVALID_PARAMETER;
size = romsize + sizeof(*rom);
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
(void **)&rom);
if (status != EFI_SUCCESS) {
efi_err("Failed to allocate memory for 'rom'\n");
return status;
}
memset(rom, 0, sizeof(*rom));
rom->data.type = SETUP_PCI;
rom->data.len = size - sizeof(struct setup_data);
rom->data.next = 0;
rom->pcilen = romsize;
*__rom = rom;
status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
PCI_VENDOR_ID, 1, &rom->vendor);
if (status != EFI_SUCCESS) {
efi_err("Failed to read rom->vendor\n");
goto free_struct;
}
status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
PCI_DEVICE_ID, 1, &rom->devid);
if (status != EFI_SUCCESS) {
efi_err("Failed to read rom->devid\n");
goto free_struct;
}
status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus,
&rom->device, &rom->function);
if (status != EFI_SUCCESS)
goto free_struct;
memcpy(rom->romdata, romimage, romsize);
return status;
free_struct:
efi_bs_call(free_pool, rom);
return status;
}
/*
* There's no way to return an informative status from this function,
* because any analysis (and printing of error messages) needs to be
* done directly at the EFI function call-site.
*
* For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we
* just didn't find any PCI devices, but there's no way to tell outside
* the context of the call.
*/
static void setup_efi_pci(struct boot_params *params)
{
efi_status_t status;
void **pci_handle = NULL;
efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
unsigned long size = 0;
struct setup_data *data;
efi_handle_t h;
int i;
status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
&pci_proto, NULL, &size, pci_handle);
if (status == EFI_BUFFER_TOO_SMALL) {
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
(void **)&pci_handle);
if (status != EFI_SUCCESS) {
efi_err("Failed to allocate memory for 'pci_handle'\n");
return;
}
status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
&pci_proto, NULL, &size, pci_handle);
}
if (status != EFI_SUCCESS)
goto free_handle;
data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
while (data && data->next)
data = (struct setup_data *)(unsigned long)data->next;
for_each_efi_handle(h, pci_handle, size, i) {
efi_pci_io_protocol_t *pci = NULL;
struct pci_setup_rom *rom;
status = efi_bs_call(handle_protocol, h, &pci_proto,
(void **)&pci);
if (status != EFI_SUCCESS || !pci)
continue;
status = preserve_pci_rom_image(pci, &rom);
if (status != EFI_SUCCESS)
continue;
if (data)
data->next = (unsigned long)rom;
else
params->hdr.setup_data = (unsigned long)rom;
data = (struct setup_data *)rom;
}
free_handle:
efi_bs_call(free_pool, pci_handle);
}
static void retrieve_apple_device_properties(struct boot_params *boot_params)
{
efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID;
struct setup_data *data, *new;
efi_status_t status;
u32 size = 0;
apple_properties_protocol_t *p;
status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p);
if (status != EFI_SUCCESS)
return;
if (efi_table_attr(p, version) != 0x10000) {
efi_err("Unsupported properties proto version\n");
return;
}
efi_call_proto(p, get_all, NULL, &size);
if (!size)
return;
do {
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA,
size + sizeof(struct setup_data),
(void **)&new);
if (status != EFI_SUCCESS) {
efi_err("Failed to allocate memory for 'properties'\n");
return;
}
status = efi_call_proto(p, get_all, new->data, &size);
if (status == EFI_BUFFER_TOO_SMALL)
efi_bs_call(free_pool, new);
} while (status == EFI_BUFFER_TOO_SMALL);
new->type = SETUP_APPLE_PROPERTIES;
new->len = size;
new->next = 0;
data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data;
if (!data) {
boot_params->hdr.setup_data = (unsigned long)new;
} else {
while (data->next)
data = (struct setup_data *)(unsigned long)data->next;
data->next = (unsigned long)new;
}
}
void efi_adjust_memory_range_protection(unsigned long start,
unsigned long size)
{
efi_status_t status;
efi_gcd_memory_space_desc_t desc;
unsigned long end, next;
unsigned long rounded_start, rounded_end;
unsigned long unprotect_start, unprotect_size;
rounded_start = rounddown(start, EFI_PAGE_SIZE);
rounded_end = roundup(start + size, EFI_PAGE_SIZE);
if (memattr != NULL) {
efi_call_proto(memattr, clear_memory_attributes, rounded_start,
rounded_end - rounded_start, EFI_MEMORY_XP);
return;
}
if (efi_dxe_table == NULL)
return;
/*
* Don't modify memory region attributes, they are
* already suitable, to lower the possibility to
* encounter firmware bugs.
*/
for (end = start + size; start < end; start = next) {
status = efi_dxe_call(get_memory_space_descriptor, start, &desc);
if (status != EFI_SUCCESS)
return;
next = desc.base_address + desc.length;
/*
* Only system memory is suitable for trampoline/kernel image placement,
* so only this type of memory needs its attributes to be modified.
*/
if (desc.gcd_memory_type != EfiGcdMemoryTypeSystemMemory ||
(desc.attributes & (EFI_MEMORY_RO | EFI_MEMORY_XP)) == 0)
continue;
unprotect_start = max(rounded_start, (unsigned long)desc.base_address);
unprotect_size = min(rounded_end, next) - unprotect_start;
status = efi_dxe_call(set_memory_space_attributes,
unprotect_start, unprotect_size,
EFI_MEMORY_WB);
if (status != EFI_SUCCESS) {
efi_warn("Unable to unprotect memory range [%08lx,%08lx]: %lx\n",
unprotect_start,
unprotect_start + unprotect_size,
status);
}
}
}
static void setup_unaccepted_memory(void)
{
efi_guid_t mem_acceptance_proto = OVMF_SEV_MEMORY_ACCEPTANCE_PROTOCOL_GUID;
sev_memory_acceptance_protocol_t *proto;
efi_status_t status;
if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY))
return;
/*
* Enable unaccepted memory before calling exit boot services in order
* for the UEFI to not accept all memory on EBS.
*/
status = efi_bs_call(locate_protocol, &mem_acceptance_proto, NULL,
(void **)&proto);
if (status != EFI_SUCCESS)
return;
status = efi_call_proto(proto, allow_unaccepted_memory);
if (status != EFI_SUCCESS)
efi_err("Memory acceptance protocol failed\n");
}
static const efi_char16_t apple[] = L"Apple";
static void setup_quirks(struct boot_params *boot_params)
{
efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long)
efi_table_attr(efi_system_table, fw_vendor);
if (!memcmp(fw_vendor, apple, sizeof(apple))) {
if (IS_ENABLED(CONFIG_APPLE_PROPERTIES))
retrieve_apple_device_properties(boot_params);
}
}
/*
* See if we have Universal Graphics Adapter (UGA) protocol
*/
static efi_status_t
setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size)
{
efi_status_t status;
u32 width, height;
void **uga_handle = NULL;
efi_uga_draw_protocol_t *uga = NULL, *first_uga;
efi_handle_t handle;
int i;
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
(void **)&uga_handle);
if (status != EFI_SUCCESS)
return status;
status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
uga_proto, NULL, &size, uga_handle);
if (status != EFI_SUCCESS)
goto free_handle;
height = 0;
width = 0;
first_uga = NULL;
for_each_efi_handle(handle, uga_handle, size, i) {
efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
u32 w, h, depth, refresh;
void *pciio;
status = efi_bs_call(handle_protocol, handle, uga_proto,
(void **)&uga);
if (status != EFI_SUCCESS)
continue;
pciio = NULL;
efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio);
status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh);
if (status == EFI_SUCCESS && (!first_uga || pciio)) {
width = w;
height = h;
/*
* Once we've found a UGA supporting PCIIO,
* don't bother looking any further.
*/
if (pciio)
break;
first_uga = uga;
}
}
if (!width && !height)
goto free_handle;
/* EFI framebuffer */
si->orig_video_isVGA = VIDEO_TYPE_EFI;
si->lfb_depth = 32;
si->lfb_width = width;
si->lfb_height = height;
si->red_size = 8;
si->red_pos = 16;
si->green_size = 8;
si->green_pos = 8;
si->blue_size = 8;
si->blue_pos = 0;
si->rsvd_size = 8;
si->rsvd_pos = 24;
free_handle:
efi_bs_call(free_pool, uga_handle);
return status;
}
static void setup_graphics(struct boot_params *boot_params)
{
efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
struct screen_info *si;
efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
efi_status_t status;
unsigned long size;
void **gop_handle = NULL;
void **uga_handle = NULL;
si = &boot_params->screen_info;
memset(si, 0, sizeof(*si));
size = 0;
status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
&graphics_proto, NULL, &size, gop_handle);
if (status == EFI_BUFFER_TOO_SMALL)
status = efi_setup_gop(si, &graphics_proto, size);
if (status != EFI_SUCCESS) {
size = 0;
status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
&uga_proto, NULL, &size, uga_handle);
if (status == EFI_BUFFER_TOO_SMALL)
setup_uga(si, &uga_proto, size);
}
}
static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status)
{
efi_bs_call(exit, handle, status, 0, NULL);
for(;;)
asm("hlt");
}
void __noreturn efi_stub_entry(efi_handle_t handle,
efi_system_table_t *sys_table_arg,
struct boot_params *boot_params);
/*
* Because the x86 boot code expects to be passed a boot_params we
* need to create one ourselves (usually the bootloader would create
* one for us).
*/
efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
efi_system_table_t *sys_table_arg)
{
struct boot_params *boot_params;
struct setup_header *hdr;
void *image_base;
efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
int options_size = 0;
efi_status_t status;
char *cmdline_ptr;
efi_system_table = sys_table_arg;
/* Check if we were booted by the EFI firmware */
if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
efi_exit(handle, EFI_INVALID_PARAMETER);
status = efi_bs_call(handle_protocol, handle, &proto, (void **)&image);
if (status != EFI_SUCCESS) {
efi_err("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
efi_exit(handle, status);
}
image_base = efi_table_attr(image, image_base);
status = efi_allocate_pages(sizeof(struct boot_params),
(unsigned long *)&boot_params, ULONG_MAX);
if (status != EFI_SUCCESS) {
efi_err("Failed to allocate lowmem for boot params\n");
efi_exit(handle, status);
}
memset(boot_params, 0x0, sizeof(struct boot_params));
hdr = &boot_params->hdr;
/* Copy the setup header from the second sector to boot_params */
memcpy(&hdr->jump, image_base + 512,
sizeof(struct setup_header) - offsetof(struct setup_header, jump));
/*
* Fill out some of the header fields ourselves because the
* EFI firmware loader doesn't load the first sector.
*/
hdr->root_flags = 1;
hdr->vid_mode = 0xffff;
hdr->boot_flag = 0xAA55;
hdr->type_of_loader = 0x21;
/* Convert unicode cmdline to ascii */
cmdline_ptr = efi_convert_cmdline(image, &options_size);
if (!cmdline_ptr)
goto fail;
efi_set_u64_split((unsigned long)cmdline_ptr,
&hdr->cmd_line_ptr, &boot_params->ext_cmd_line_ptr);
hdr->ramdisk_image = 0;
hdr->ramdisk_size = 0;
/*
* Disregard any setup data that was provided by the bootloader:
* setup_data could be pointing anywhere, and we have no way of
* authenticating or validating the payload.
*/
hdr->setup_data = 0;
efi_stub_entry(handle, sys_table_arg, boot_params);
/* not reached */
fail:
efi_free(sizeof(struct boot_params), (unsigned long)boot_params);
efi_exit(handle, status);
}
static void add_e820ext(struct boot_params *params,
struct setup_data *e820ext, u32 nr_entries)
{
struct setup_data *data;
e820ext->type = SETUP_E820_EXT;
e820ext->len = nr_entries * sizeof(struct boot_e820_entry);
e820ext->next = 0;
data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
while (data && data->next)
data = (struct setup_data *)(unsigned long)data->next;
if (data)
data->next = (unsigned long)e820ext;
else
params->hdr.setup_data = (unsigned long)e820ext;
}
static efi_status_t
setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size)
{
struct boot_e820_entry *entry = params->e820_table;
struct efi_info *efi = ¶ms->efi_info;
struct boot_e820_entry *prev = NULL;
u32 nr_entries;
u32 nr_desc;
int i;
nr_entries = 0;
nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
for (i = 0; i < nr_desc; i++) {
efi_memory_desc_t *d;
unsigned int e820_type = 0;
unsigned long m = efi->efi_memmap;
#ifdef CONFIG_X86_64
m |= (u64)efi->efi_memmap_hi << 32;
#endif
d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i);
switch (d->type) {
case EFI_RESERVED_TYPE:
case EFI_RUNTIME_SERVICES_CODE:
case EFI_RUNTIME_SERVICES_DATA:
case EFI_MEMORY_MAPPED_IO:
case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
case EFI_PAL_CODE:
e820_type = E820_TYPE_RESERVED;
break;
case EFI_UNUSABLE_MEMORY:
e820_type = E820_TYPE_UNUSABLE;
break;
case EFI_ACPI_RECLAIM_MEMORY:
e820_type = E820_TYPE_ACPI;
break;
case EFI_LOADER_CODE:
case EFI_LOADER_DATA:
case EFI_BOOT_SERVICES_CODE:
case EFI_BOOT_SERVICES_DATA:
case EFI_CONVENTIONAL_MEMORY:
if (efi_soft_reserve_enabled() &&
(d->attribute & EFI_MEMORY_SP))
e820_type = E820_TYPE_SOFT_RESERVED;
else
e820_type = E820_TYPE_RAM;
break;
case EFI_ACPI_MEMORY_NVS:
e820_type = E820_TYPE_NVS;
break;
case EFI_PERSISTENT_MEMORY:
e820_type = E820_TYPE_PMEM;
break;
case EFI_UNACCEPTED_MEMORY:
if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) {
efi_warn_once(
"The system has unaccepted memory, but kernel does not support it\nConsider enabling CONFIG_UNACCEPTED_MEMORY\n");
continue;
}
e820_type = E820_TYPE_RAM;
process_unaccepted_memory(d->phys_addr,
d->phys_addr + PAGE_SIZE * d->num_pages);
break;
default:
continue;
}
/* Merge adjacent mappings */
if (prev && prev->type == e820_type &&
(prev->addr + prev->size) == d->phys_addr) {
prev->size += d->num_pages << 12;
continue;
}
if (nr_entries == ARRAY_SIZE(params->e820_table)) {
u32 need = (nr_desc - i) * sizeof(struct e820_entry) +
sizeof(struct setup_data);
if (!e820ext || e820ext_size < need)
return EFI_BUFFER_TOO_SMALL;
/* boot_params map full, switch to e820 extended */
entry = (struct boot_e820_entry *)e820ext->data;
}
entry->addr = d->phys_addr;
entry->size = d->num_pages << PAGE_SHIFT;
entry->type = e820_type;
prev = entry++;
nr_entries++;
}
if (nr_entries > ARRAY_SIZE(params->e820_table)) {
u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table);
add_e820ext(params, e820ext, nr_e820ext);
nr_entries -= nr_e820ext;
}
params->e820_entries = (u8)nr_entries;
return EFI_SUCCESS;
}
static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
u32 *e820ext_size)
{
efi_status_t status;
unsigned long size;
size = sizeof(struct setup_data) +
sizeof(struct e820_entry) * nr_desc;
if (*e820ext) {
efi_bs_call(free_pool, *e820ext);
*e820ext = NULL;
*e820ext_size = 0;
}
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
(void **)e820ext);
if (status == EFI_SUCCESS)
*e820ext_size = size;
return status;
}
static efi_status_t allocate_e820(struct boot_params *params,
struct setup_data **e820ext,
u32 *e820ext_size)
{
struct efi_boot_memmap *map;
efi_status_t status;
__u32 nr_desc;
status = efi_get_memory_map(&map, false);
if (status != EFI_SUCCESS)
return status;
nr_desc = map->map_size / map->desc_size;
if (nr_desc > ARRAY_SIZE(params->e820_table) - EFI_MMAP_NR_SLACK_SLOTS) {
u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table) +
EFI_MMAP_NR_SLACK_SLOTS;
status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size);
}
if (IS_ENABLED(CONFIG_UNACCEPTED_MEMORY) && status == EFI_SUCCESS)
status = allocate_unaccepted_bitmap(nr_desc, map);
efi_bs_call(free_pool, map);
return status;
}
struct exit_boot_struct {
struct boot_params *boot_params;
struct efi_info *efi;
};
static efi_status_t exit_boot_func(struct efi_boot_memmap *map,
void *priv)
{
const char *signature;
struct exit_boot_struct *p = priv;
signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE
: EFI32_LOADER_SIGNATURE;
memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32));
efi_set_u64_split((unsigned long)efi_system_table,
&p->efi->efi_systab, &p->efi->efi_systab_hi);
p->efi->efi_memdesc_size = map->desc_size;
p->efi->efi_memdesc_version = map->desc_ver;
efi_set_u64_split((unsigned long)map->map,
&p->efi->efi_memmap, &p->efi->efi_memmap_hi);
p->efi->efi_memmap_size = map->map_size;
return EFI_SUCCESS;
}
static efi_status_t exit_boot(struct boot_params *boot_params, void *handle)
{
struct setup_data *e820ext = NULL;
__u32 e820ext_size = 0;
efi_status_t status;
struct exit_boot_struct priv;
priv.boot_params = boot_params;
priv.efi = &boot_params->efi_info;
status = allocate_e820(boot_params, &e820ext, &e820ext_size);
if (status != EFI_SUCCESS)
return status;
/* Might as well exit boot services now */
status = efi_exit_boot_services(handle, &priv, exit_boot_func);
if (status != EFI_SUCCESS)
return status;
/* Historic? */
boot_params->alt_mem_k = 32 * 1024;
status = setup_e820(boot_params, e820ext, e820ext_size);
if (status != EFI_SUCCESS)
return status;
return EFI_SUCCESS;
}
static bool have_unsupported_snp_features(void)
{
u64 unsupported;
unsupported = snp_get_unsupported_features(sev_get_status());
if (unsupported) {
efi_err("Unsupported SEV-SNP features detected: 0x%llx\n",
unsupported);
return true;
}
return false;
}
static void efi_get_seed(void *seed, int size)
{
efi_get_random_bytes(size, seed);
/*
* This only updates seed[0] when running on 32-bit, but in that case,
* seed[1] is not used anyway, as there is no virtual KASLR on 32-bit.
*/
*(unsigned long *)seed ^= kaslr_get_random_long("EFI");
}
static void error(char *str)
{
efi_warn("Decompression failed: %s\n", str);
}
static efi_status_t efi_decompress_kernel(unsigned long *kernel_entry)
{
unsigned long virt_addr = LOAD_PHYSICAL_ADDR;
unsigned long addr, alloc_size, entry;
efi_status_t status;
u32 seed[2] = {};
/* determine the required size of the allocation */
alloc_size = ALIGN(max_t(unsigned long, output_len, kernel_total_size),
MIN_KERNEL_ALIGN);
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && !efi_nokaslr) {
u64 range = KERNEL_IMAGE_SIZE - LOAD_PHYSICAL_ADDR - kernel_total_size;
efi_get_seed(seed, sizeof(seed));
virt_addr += (range * seed[1]) >> 32;
virt_addr &= ~(CONFIG_PHYSICAL_ALIGN - 1);
}
status = efi_random_alloc(alloc_size, CONFIG_PHYSICAL_ALIGN, &addr,
seed[0], EFI_LOADER_CODE,
EFI_X86_KERNEL_ALLOC_LIMIT);
if (status != EFI_SUCCESS)
return status;
entry = decompress_kernel((void *)addr, virt_addr, error);
if (entry == ULONG_MAX) {
efi_free(alloc_size, addr);
return EFI_LOAD_ERROR;
}
*kernel_entry = addr + entry;
efi_adjust_memory_range_protection(addr, kernel_total_size);
return EFI_SUCCESS;
}
static void __noreturn enter_kernel(unsigned long kernel_addr,
struct boot_params *boot_params)
{
/* enter decompressed kernel with boot_params pointer in RSI/ESI */
asm("jmp *%0"::"r"(kernel_addr), "S"(boot_params));
unreachable();
}
/*
* On success, this routine will jump to the relocated image directly and never
* return. On failure, it will exit to the firmware via efi_exit() instead of
* returning.
*/
void __noreturn efi_stub_entry(efi_handle_t handle,
efi_system_table_t *sys_table_arg,
struct boot_params *boot_params)
{
efi_guid_t guid = EFI_MEMORY_ATTRIBUTE_PROTOCOL_GUID;
struct setup_header *hdr = &boot_params->hdr;
const struct linux_efi_initrd *initrd = NULL;
unsigned long kernel_entry;
efi_status_t status;
efi_system_table = sys_table_arg;
/* Check if we were booted by the EFI firmware */
if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
efi_exit(handle, EFI_INVALID_PARAMETER);
if (have_unsupported_snp_features())
efi_exit(handle, EFI_UNSUPPORTED);
if (IS_ENABLED(CONFIG_EFI_DXE_MEM_ATTRIBUTES)) {
efi_dxe_table = get_efi_config_table(EFI_DXE_SERVICES_TABLE_GUID);
if (efi_dxe_table &&
efi_dxe_table->hdr.signature != EFI_DXE_SERVICES_TABLE_SIGNATURE) {
efi_warn("Ignoring DXE services table: invalid signature\n");
efi_dxe_table = NULL;
}
}
/* grab the memory attributes protocol if it exists */
efi_bs_call(locate_protocol, &guid, NULL, (void **)&memattr);
status = efi_setup_5level_paging();
if (status != EFI_SUCCESS) {
efi_err("efi_setup_5level_paging() failed!\n");
goto fail;
}
#ifdef CONFIG_CMDLINE_BOOL
status = efi_parse_options(CONFIG_CMDLINE);
if (status != EFI_SUCCESS) {
efi_err("Failed to parse options\n");
goto fail;
}
#endif
if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
unsigned long cmdline_paddr = ((u64)hdr->cmd_line_ptr |
((u64)boot_params->ext_cmd_line_ptr << 32));
status = efi_parse_options((char *)cmdline_paddr);
if (status != EFI_SUCCESS) {
efi_err("Failed to parse options\n");
goto fail;
}
}
status = efi_decompress_kernel(&kernel_entry);
if (status != EFI_SUCCESS) {
efi_err("Failed to decompress kernel\n");
goto fail;
}
/*
* At this point, an initrd may already have been loaded by the
* bootloader and passed via bootparams. We permit an initrd loaded
* from the LINUX_EFI_INITRD_MEDIA_GUID device path to supersede it.
*
* If the device path is not present, any command-line initrd=
* arguments will be processed only if image is not NULL, which will be
* the case only if we were loaded via the PE entry point.
*/
status = efi_load_initrd(image, hdr->initrd_addr_max, ULONG_MAX,
&initrd);
if (status != EFI_SUCCESS)
goto fail;
if (initrd && initrd->size > 0) {
efi_set_u64_split(initrd->base, &hdr->ramdisk_image,
&boot_params->ext_ramdisk_image);
efi_set_u64_split(initrd->size, &hdr->ramdisk_size,
&boot_params->ext_ramdisk_size);
}
/*
* If the boot loader gave us a value for secure_boot then we use that,
* otherwise we ask the BIOS.
*/
if (boot_params->secure_boot == efi_secureboot_mode_unset)
boot_params->secure_boot = efi_get_secureboot();
/* Ask the firmware to clear memory on unclean shutdown */
efi_enable_reset_attack_mitigation();
efi_random_get_seed();
efi_retrieve_tpm2_eventlog();
setup_graphics(boot_params);
setup_efi_pci(boot_params);
setup_quirks(boot_params);
setup_unaccepted_memory();
status = exit_boot(boot_params, handle);
if (status != EFI_SUCCESS) {
efi_err("exit_boot() failed!\n");
goto fail;
}
/*
* Call the SEV init code while still running with the firmware's
* GDT/IDT, so #VC exceptions will be handled by EFI.
*/
sev_enable(boot_params);
efi_5level_switch();
enter_kernel(kernel_entry, boot_params);
fail:
efi_err("efi_stub_entry() failed!\n");
efi_exit(handle, status);
}
#ifdef CONFIG_EFI_HANDOVER_PROTOCOL
void efi_handover_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg,
struct boot_params *boot_params)
{
extern char _bss[], _ebss[];
memset(_bss, 0, _ebss - _bss);
efi_stub_entry(handle, sys_table_arg, boot_params);
}
#ifndef CONFIG_EFI_MIXED
extern __alias(efi_handover_entry)
void efi32_stub_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg,
struct boot_params *boot_params);
extern __alias(efi_handover_entry)
void efi64_stub_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg,
struct boot_params *boot_params);
#endif
#endif
| linux-master | drivers/firmware/efi/libstub/x86-stub.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Secure boot handling.
*
* Copyright (C) 2013,2014 Linaro Limited
* Roy Franz <[email protected]
* Copyright (C) 2013 Red Hat, Inc.
* Mark Salter <[email protected]>
*/
#include <linux/efi.h>
#include <asm/efi.h>
#include "efistub.h"
/* SHIM variables */
static const efi_guid_t shim_guid = EFI_SHIM_LOCK_GUID;
static const efi_char16_t shim_MokSBState_name[] = L"MokSBStateRT";
static efi_status_t get_var(efi_char16_t *name, efi_guid_t *vendor, u32 *attr,
unsigned long *data_size, void *data)
{
return get_efi_var(name, vendor, attr, data_size, data);
}
/*
* Determine whether we're in secure boot mode.
*/
enum efi_secureboot_mode efi_get_secureboot(void)
{
u32 attr;
unsigned long size;
enum efi_secureboot_mode mode;
efi_status_t status;
u8 moksbstate;
mode = efi_get_secureboot_mode(get_var);
if (mode == efi_secureboot_mode_unknown) {
efi_err("Could not determine UEFI Secure Boot status.\n");
return efi_secureboot_mode_unknown;
}
if (mode != efi_secureboot_mode_enabled)
return mode;
/*
* See if a user has put the shim into insecure mode. If so, and if the
* variable doesn't have the non-volatile attribute set, we might as
* well honor that.
*/
size = sizeof(moksbstate);
status = get_efi_var(shim_MokSBState_name, &shim_guid,
&attr, &size, &moksbstate);
/* If it fails, we don't care why. Default to secure */
if (status != EFI_SUCCESS)
goto secure_boot_enabled;
if (!(attr & EFI_VARIABLE_NON_VOLATILE) && moksbstate == 1)
return efi_secureboot_mode_disabled;
secure_boot_enabled:
efi_info("UEFI Secure Boot is enabled.\n");
return efi_secureboot_mode_enabled;
}
| linux-master | drivers/firmware/efi/libstub/secureboot.c |
// SPDX-License-Identifier: GPL-2.0
#include <linux/efi.h>
#include <asm/efi.h>
#include "efistub.h"
/**
* efi_allocate_pages_aligned() - Allocate memory pages
* @size: minimum number of bytes to allocate
* @addr: On return the address of the first allocated page. The first
* allocated page has alignment EFI_ALLOC_ALIGN which is an
* architecture dependent multiple of the page size.
* @max: the address that the last allocated memory page shall not
* exceed
* @align: minimum alignment of the base of the allocation
*
* Allocate pages as EFI_LOADER_DATA. The allocated pages are aligned according
* to @align, which should be >= EFI_ALLOC_ALIGN. The last allocated page will
* not exceed the address given by @max.
*
* Return: status code
*/
efi_status_t efi_allocate_pages_aligned(unsigned long size, unsigned long *addr,
unsigned long max, unsigned long align,
int memory_type)
{
efi_physical_addr_t alloc_addr;
efi_status_t status;
int slack;
max = min(max, EFI_ALLOC_LIMIT);
if (align < EFI_ALLOC_ALIGN)
align = EFI_ALLOC_ALIGN;
alloc_addr = ALIGN_DOWN(max + 1, align) - 1;
size = round_up(size, EFI_ALLOC_ALIGN);
slack = align / EFI_PAGE_SIZE - 1;
status = efi_bs_call(allocate_pages, EFI_ALLOCATE_MAX_ADDRESS,
memory_type, size / EFI_PAGE_SIZE + slack,
&alloc_addr);
if (status != EFI_SUCCESS)
return status;
*addr = ALIGN((unsigned long)alloc_addr, align);
if (slack > 0) {
int l = (alloc_addr & (align - 1)) / EFI_PAGE_SIZE;
if (l) {
efi_bs_call(free_pages, alloc_addr, slack - l + 1);
slack = l - 1;
}
if (slack)
efi_bs_call(free_pages, *addr + size, slack);
}
return EFI_SUCCESS;
}
| linux-master | drivers/firmware/efi/libstub/alignedmem.c |
// SPDX-License-Identifier: GPL-2.0
/*
* TPM handling.
*
* Copyright (C) 2016 CoreOS, Inc
* Copyright (C) 2017 Google, Inc.
* Matthew Garrett <[email protected]>
* Thiebaud Weksteen <[email protected]>
*/
#include <linux/efi.h>
#include <linux/tpm_eventlog.h>
#include <asm/efi.h>
#include "efistub.h"
#ifdef CONFIG_RESET_ATTACK_MITIGATION
static const efi_char16_t efi_MemoryOverWriteRequest_name[] =
L"MemoryOverwriteRequestControl";
#define MEMORY_ONLY_RESET_CONTROL_GUID \
EFI_GUID(0xe20939be, 0x32d4, 0x41be, 0xa1, 0x50, 0x89, 0x7f, 0x85, 0xd4, 0x98, 0x29)
/*
* Enable reboot attack mitigation. This requests that the firmware clear the
* RAM on next reboot before proceeding with boot, ensuring that any secrets
* are cleared. If userland has ensured that all secrets have been removed
* from RAM before reboot it can simply reset this variable.
*/
void efi_enable_reset_attack_mitigation(void)
{
u8 val = 1;
efi_guid_t var_guid = MEMORY_ONLY_RESET_CONTROL_GUID;
efi_status_t status;
unsigned long datasize = 0;
status = get_efi_var(efi_MemoryOverWriteRequest_name, &var_guid,
NULL, &datasize, NULL);
if (status == EFI_NOT_FOUND)
return;
set_efi_var(efi_MemoryOverWriteRequest_name, &var_guid,
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS, sizeof(val), &val);
}
#endif
void efi_retrieve_tpm2_eventlog(void)
{
efi_guid_t tcg2_guid = EFI_TCG2_PROTOCOL_GUID;
efi_guid_t linux_eventlog_guid = LINUX_EFI_TPM_EVENT_LOG_GUID;
efi_status_t status;
efi_physical_addr_t log_location = 0, log_last_entry = 0;
struct linux_efi_tpm_eventlog *log_tbl = NULL;
struct efi_tcg2_final_events_table *final_events_table = NULL;
unsigned long first_entry_addr, last_entry_addr;
size_t log_size, last_entry_size;
efi_bool_t truncated;
int version = EFI_TCG2_EVENT_LOG_FORMAT_TCG_2;
efi_tcg2_protocol_t *tcg2_protocol = NULL;
int final_events_size = 0;
status = efi_bs_call(locate_protocol, &tcg2_guid, NULL,
(void **)&tcg2_protocol);
if (status != EFI_SUCCESS)
return;
status = efi_call_proto(tcg2_protocol, get_event_log, version,
&log_location, &log_last_entry, &truncated);
if (status != EFI_SUCCESS || !log_location) {
version = EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
status = efi_call_proto(tcg2_protocol, get_event_log, version,
&log_location, &log_last_entry,
&truncated);
if (status != EFI_SUCCESS || !log_location)
return;
}
first_entry_addr = (unsigned long) log_location;
/*
* We populate the EFI table even if the logs are empty.
*/
if (!log_last_entry) {
log_size = 0;
} else {
last_entry_addr = (unsigned long) log_last_entry;
/*
* get_event_log only returns the address of the last entry.
* We need to calculate its size to deduce the full size of
* the logs.
*/
if (version == EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) {
/*
* The TCG2 log format has variable length entries,
* and the information to decode the hash algorithms
* back into a size is contained in the first entry -
* pass a pointer to the final entry (to calculate its
* size) and the first entry (so we know how long each
* digest is)
*/
last_entry_size =
__calc_tpm2_event_size((void *)last_entry_addr,
(void *)(long)log_location,
false);
} else {
last_entry_size = sizeof(struct tcpa_event) +
((struct tcpa_event *) last_entry_addr)->event_size;
}
log_size = log_last_entry - log_location + last_entry_size;
}
/* Allocate space for the logs and copy them. */
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA,
sizeof(*log_tbl) + log_size, (void **)&log_tbl);
if (status != EFI_SUCCESS) {
efi_err("Unable to allocate memory for event log\n");
return;
}
/*
* Figure out whether any events have already been logged to the
* final events structure, and if so how much space they take up
*/
if (version == EFI_TCG2_EVENT_LOG_FORMAT_TCG_2)
final_events_table = get_efi_config_table(LINUX_EFI_TPM_FINAL_LOG_GUID);
if (final_events_table && final_events_table->nr_events) {
struct tcg_pcr_event2_head *header;
int offset;
void *data;
int event_size;
int i = final_events_table->nr_events;
data = (void *)final_events_table;
offset = sizeof(final_events_table->version) +
sizeof(final_events_table->nr_events);
while (i > 0) {
header = data + offset + final_events_size;
event_size = __calc_tpm2_event_size(header,
(void *)(long)log_location,
false);
final_events_size += event_size;
i--;
}
}
memset(log_tbl, 0, sizeof(*log_tbl) + log_size);
log_tbl->size = log_size;
log_tbl->final_events_preboot_size = final_events_size;
log_tbl->version = version;
memcpy(log_tbl->log, (void *) first_entry_addr, log_size);
status = efi_bs_call(install_configuration_table,
&linux_eventlog_guid, log_tbl);
if (status != EFI_SUCCESS)
goto err_free;
return;
err_free:
efi_bs_call(free_pool, log_tbl);
}
| linux-master | drivers/firmware/efi/libstub/tpm.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020 Western Digital Corporation or its affiliates.
*/
#include <linux/efi.h>
#include <linux/libfdt.h>
#include <asm/efi.h>
#include <asm/unaligned.h>
#include "efistub.h"
typedef void __noreturn (*jump_kernel_func)(unsigned long, unsigned long);
static unsigned long hartid;
static int get_boot_hartid_from_fdt(void)
{
const void *fdt;
int chosen_node, len;
const void *prop;
fdt = get_efi_config_table(DEVICE_TREE_GUID);
if (!fdt)
return -EINVAL;
chosen_node = fdt_path_offset(fdt, "/chosen");
if (chosen_node < 0)
return -EINVAL;
prop = fdt_getprop((void *)fdt, chosen_node, "boot-hartid", &len);
if (!prop)
return -EINVAL;
if (len == sizeof(u32))
hartid = (unsigned long) fdt32_to_cpu(*(fdt32_t *)prop);
else if (len == sizeof(u64))
hartid = (unsigned long) fdt64_to_cpu(__get_unaligned_t(fdt64_t, prop));
else
return -EINVAL;
return 0;
}
static efi_status_t get_boot_hartid_from_efi(void)
{
efi_guid_t boot_protocol_guid = RISCV_EFI_BOOT_PROTOCOL_GUID;
struct riscv_efi_boot_protocol *boot_protocol;
efi_status_t status;
status = efi_bs_call(locate_protocol, &boot_protocol_guid, NULL,
(void **)&boot_protocol);
if (status != EFI_SUCCESS)
return status;
return efi_call_proto(boot_protocol, get_boot_hartid, &hartid);
}
efi_status_t check_platform_features(void)
{
efi_status_t status;
int ret;
status = get_boot_hartid_from_efi();
if (status != EFI_SUCCESS) {
ret = get_boot_hartid_from_fdt();
if (ret) {
efi_err("Failed to get boot hartid!\n");
return EFI_UNSUPPORTED;
}
}
return EFI_SUCCESS;
}
unsigned long __weak stext_offset(void)
{
/*
* This fallback definition is used by the EFI zboot stub, which loads
* the entire image so it can branch via the image header at offset #0.
*/
return 0;
}
void __noreturn efi_enter_kernel(unsigned long entrypoint, unsigned long fdt,
unsigned long fdt_size)
{
unsigned long kernel_entry = entrypoint + stext_offset();
jump_kernel_func jump_kernel = (jump_kernel_func)kernel_entry;
/*
* Jump to real kernel here with following constraints.
* 1. MMU should be disabled.
* 2. a0 should contain hartid
* 3. a1 should DT address
*/
csr_write(CSR_SATP, 0);
jump_kernel(hartid, fdt);
}
| linux-master | drivers/firmware/efi/libstub/riscv.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2013, 2014 Linaro Ltd; <[email protected]>
*
* This file implements the EFI boot stub for the arm64 kernel.
* Adapted from ARM version by Mark Salter <[email protected]>
*/
#include <linux/efi.h>
#include <asm/efi.h>
#include <asm/memory.h>
#include <asm/sections.h>
#include "efistub.h"
efi_status_t handle_kernel_image(unsigned long *image_addr,
unsigned long *image_size,
unsigned long *reserve_addr,
unsigned long *reserve_size,
efi_loaded_image_t *image,
efi_handle_t image_handle)
{
efi_status_t status;
unsigned long kernel_size, kernel_codesize, kernel_memsize;
if (image->image_base != _text) {
efi_err("FIRMWARE BUG: efi_loaded_image_t::image_base has bogus value\n");
image->image_base = _text;
}
if (!IS_ALIGNED((u64)_text, SEGMENT_ALIGN))
efi_err("FIRMWARE BUG: kernel image not aligned on %dk boundary\n",
SEGMENT_ALIGN >> 10);
kernel_size = _edata - _text;
kernel_codesize = __inittext_end - _text;
kernel_memsize = kernel_size + (_end - _edata);
*reserve_size = kernel_memsize;
*image_addr = (unsigned long)_text;
status = efi_kaslr_relocate_kernel(image_addr,
reserve_addr, reserve_size,
kernel_size, kernel_codesize,
kernel_memsize,
efi_kaslr_get_phys_seed(image_handle));
if (status != EFI_SUCCESS)
return status;
return EFI_SUCCESS;
}
asmlinkage void primary_entry(void);
unsigned long primary_entry_offset(void)
{
/*
* When built as part of the kernel, the EFI stub cannot branch to the
* kernel proper via the image header, as the PE/COFF header is
* strictly not part of the in-memory presentation of the image, only
* of the file representation. So instead, we need to jump to the
* actual entrypoint in the .text region of the image.
*/
return (char *)primary_entry - _text;
}
void efi_icache_sync(unsigned long start, unsigned long end)
{
caches_clean_inval_pou(start, end);
}
| linux-master | drivers/firmware/efi/libstub/arm64-stub.c |
// SPDX-License-Identifier: GPL-2.0
/* -----------------------------------------------------------------------
*
* Copyright 2011 Intel Corporation; author Matt Fleming
*
* ----------------------------------------------------------------------- */
#include <linux/bitops.h>
#include <linux/ctype.h>
#include <linux/efi.h>
#include <linux/screen_info.h>
#include <linux/string.h>
#include <asm/efi.h>
#include <asm/setup.h>
#include "efistub.h"
enum efi_cmdline_option {
EFI_CMDLINE_NONE,
EFI_CMDLINE_MODE_NUM,
EFI_CMDLINE_RES,
EFI_CMDLINE_AUTO,
EFI_CMDLINE_LIST
};
static struct {
enum efi_cmdline_option option;
union {
u32 mode;
struct {
u32 width, height;
int format;
u8 depth;
} res;
};
} cmdline = { .option = EFI_CMDLINE_NONE };
static bool parse_modenum(char *option, char **next)
{
u32 m;
if (!strstarts(option, "mode="))
return false;
option += strlen("mode=");
m = simple_strtoull(option, &option, 0);
if (*option && *option++ != ',')
return false;
cmdline.option = EFI_CMDLINE_MODE_NUM;
cmdline.mode = m;
*next = option;
return true;
}
static bool parse_res(char *option, char **next)
{
u32 w, h, d = 0;
int pf = -1;
if (!isdigit(*option))
return false;
w = simple_strtoull(option, &option, 10);
if (*option++ != 'x' || !isdigit(*option))
return false;
h = simple_strtoull(option, &option, 10);
if (*option == '-') {
option++;
if (strstarts(option, "rgb")) {
option += strlen("rgb");
pf = PIXEL_RGB_RESERVED_8BIT_PER_COLOR;
} else if (strstarts(option, "bgr")) {
option += strlen("bgr");
pf = PIXEL_BGR_RESERVED_8BIT_PER_COLOR;
} else if (isdigit(*option))
d = simple_strtoull(option, &option, 10);
else
return false;
}
if (*option && *option++ != ',')
return false;
cmdline.option = EFI_CMDLINE_RES;
cmdline.res.width = w;
cmdline.res.height = h;
cmdline.res.format = pf;
cmdline.res.depth = d;
*next = option;
return true;
}
static bool parse_auto(char *option, char **next)
{
if (!strstarts(option, "auto"))
return false;
option += strlen("auto");
if (*option && *option++ != ',')
return false;
cmdline.option = EFI_CMDLINE_AUTO;
*next = option;
return true;
}
static bool parse_list(char *option, char **next)
{
if (!strstarts(option, "list"))
return false;
option += strlen("list");
if (*option && *option++ != ',')
return false;
cmdline.option = EFI_CMDLINE_LIST;
*next = option;
return true;
}
void efi_parse_option_graphics(char *option)
{
while (*option) {
if (parse_modenum(option, &option))
continue;
if (parse_res(option, &option))
continue;
if (parse_auto(option, &option))
continue;
if (parse_list(option, &option))
continue;
while (*option && *option++ != ',')
;
}
}
static u32 choose_mode_modenum(efi_graphics_output_protocol_t *gop)
{
efi_status_t status;
efi_graphics_output_protocol_mode_t *mode;
efi_graphics_output_mode_info_t *info;
unsigned long info_size;
u32 max_mode, cur_mode;
int pf;
mode = efi_table_attr(gop, mode);
cur_mode = efi_table_attr(mode, mode);
if (cmdline.mode == cur_mode)
return cur_mode;
max_mode = efi_table_attr(mode, max_mode);
if (cmdline.mode >= max_mode) {
efi_err("Requested mode is invalid\n");
return cur_mode;
}
status = efi_call_proto(gop, query_mode, cmdline.mode,
&info_size, &info);
if (status != EFI_SUCCESS) {
efi_err("Couldn't get mode information\n");
return cur_mode;
}
pf = info->pixel_format;
efi_bs_call(free_pool, info);
if (pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX) {
efi_err("Invalid PixelFormat\n");
return cur_mode;
}
return cmdline.mode;
}
static u8 pixel_bpp(int pixel_format, efi_pixel_bitmask_t pixel_info)
{
if (pixel_format == PIXEL_BIT_MASK) {
u32 mask = pixel_info.red_mask | pixel_info.green_mask |
pixel_info.blue_mask | pixel_info.reserved_mask;
if (!mask)
return 0;
return __fls(mask) - __ffs(mask) + 1;
} else
return 32;
}
static u32 choose_mode_res(efi_graphics_output_protocol_t *gop)
{
efi_status_t status;
efi_graphics_output_protocol_mode_t *mode;
efi_graphics_output_mode_info_t *info;
unsigned long info_size;
u32 max_mode, cur_mode;
int pf;
efi_pixel_bitmask_t pi;
u32 m, w, h;
mode = efi_table_attr(gop, mode);
cur_mode = efi_table_attr(mode, mode);
info = efi_table_attr(mode, info);
pf = info->pixel_format;
pi = info->pixel_information;
w = info->horizontal_resolution;
h = info->vertical_resolution;
if (w == cmdline.res.width && h == cmdline.res.height &&
(cmdline.res.format < 0 || cmdline.res.format == pf) &&
(!cmdline.res.depth || cmdline.res.depth == pixel_bpp(pf, pi)))
return cur_mode;
max_mode = efi_table_attr(mode, max_mode);
for (m = 0; m < max_mode; m++) {
if (m == cur_mode)
continue;
status = efi_call_proto(gop, query_mode, m,
&info_size, &info);
if (status != EFI_SUCCESS)
continue;
pf = info->pixel_format;
pi = info->pixel_information;
w = info->horizontal_resolution;
h = info->vertical_resolution;
efi_bs_call(free_pool, info);
if (pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX)
continue;
if (w == cmdline.res.width && h == cmdline.res.height &&
(cmdline.res.format < 0 || cmdline.res.format == pf) &&
(!cmdline.res.depth || cmdline.res.depth == pixel_bpp(pf, pi)))
return m;
}
efi_err("Couldn't find requested mode\n");
return cur_mode;
}
static u32 choose_mode_auto(efi_graphics_output_protocol_t *gop)
{
efi_status_t status;
efi_graphics_output_protocol_mode_t *mode;
efi_graphics_output_mode_info_t *info;
unsigned long info_size;
u32 max_mode, cur_mode, best_mode, area;
u8 depth;
int pf;
efi_pixel_bitmask_t pi;
u32 m, w, h, a;
u8 d;
mode = efi_table_attr(gop, mode);
cur_mode = efi_table_attr(mode, mode);
max_mode = efi_table_attr(mode, max_mode);
info = efi_table_attr(mode, info);
pf = info->pixel_format;
pi = info->pixel_information;
w = info->horizontal_resolution;
h = info->vertical_resolution;
best_mode = cur_mode;
area = w * h;
depth = pixel_bpp(pf, pi);
for (m = 0; m < max_mode; m++) {
if (m == cur_mode)
continue;
status = efi_call_proto(gop, query_mode, m,
&info_size, &info);
if (status != EFI_SUCCESS)
continue;
pf = info->pixel_format;
pi = info->pixel_information;
w = info->horizontal_resolution;
h = info->vertical_resolution;
efi_bs_call(free_pool, info);
if (pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX)
continue;
a = w * h;
if (a < area)
continue;
d = pixel_bpp(pf, pi);
if (a > area || d > depth) {
best_mode = m;
area = a;
depth = d;
}
}
return best_mode;
}
static u32 choose_mode_list(efi_graphics_output_protocol_t *gop)
{
efi_status_t status;
efi_graphics_output_protocol_mode_t *mode;
efi_graphics_output_mode_info_t *info;
unsigned long info_size;
u32 max_mode, cur_mode;
int pf;
efi_pixel_bitmask_t pi;
u32 m, w, h;
u8 d;
const char *dstr;
bool valid;
efi_input_key_t key;
mode = efi_table_attr(gop, mode);
cur_mode = efi_table_attr(mode, mode);
max_mode = efi_table_attr(mode, max_mode);
efi_printk("Available graphics modes are 0-%u\n", max_mode-1);
efi_puts(" * = current mode\n"
" - = unusable mode\n");
for (m = 0; m < max_mode; m++) {
status = efi_call_proto(gop, query_mode, m,
&info_size, &info);
if (status != EFI_SUCCESS)
continue;
pf = info->pixel_format;
pi = info->pixel_information;
w = info->horizontal_resolution;
h = info->vertical_resolution;
efi_bs_call(free_pool, info);
valid = !(pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX);
d = 0;
switch (pf) {
case PIXEL_RGB_RESERVED_8BIT_PER_COLOR:
dstr = "rgb";
break;
case PIXEL_BGR_RESERVED_8BIT_PER_COLOR:
dstr = "bgr";
break;
case PIXEL_BIT_MASK:
dstr = "";
d = pixel_bpp(pf, pi);
break;
case PIXEL_BLT_ONLY:
dstr = "blt";
break;
default:
dstr = "xxx";
break;
}
efi_printk("Mode %3u %c%c: Resolution %ux%u-%s%.0hhu\n",
m,
m == cur_mode ? '*' : ' ',
!valid ? '-' : ' ',
w, h, dstr, d);
}
efi_puts("\nPress any key to continue (or wait 10 seconds)\n");
status = efi_wait_for_key(10 * EFI_USEC_PER_SEC, &key);
if (status != EFI_SUCCESS && status != EFI_TIMEOUT) {
efi_err("Unable to read key, continuing in 10 seconds\n");
efi_bs_call(stall, 10 * EFI_USEC_PER_SEC);
}
return cur_mode;
}
static void set_mode(efi_graphics_output_protocol_t *gop)
{
efi_graphics_output_protocol_mode_t *mode;
u32 cur_mode, new_mode;
switch (cmdline.option) {
case EFI_CMDLINE_MODE_NUM:
new_mode = choose_mode_modenum(gop);
break;
case EFI_CMDLINE_RES:
new_mode = choose_mode_res(gop);
break;
case EFI_CMDLINE_AUTO:
new_mode = choose_mode_auto(gop);
break;
case EFI_CMDLINE_LIST:
new_mode = choose_mode_list(gop);
break;
default:
return;
}
mode = efi_table_attr(gop, mode);
cur_mode = efi_table_attr(mode, mode);
if (new_mode == cur_mode)
return;
if (efi_call_proto(gop, set_mode, new_mode) != EFI_SUCCESS)
efi_err("Failed to set requested mode\n");
}
static void find_bits(u32 mask, u8 *pos, u8 *size)
{
if (!mask) {
*pos = *size = 0;
return;
}
/* UEFI spec guarantees that the set bits are contiguous */
*pos = __ffs(mask);
*size = __fls(mask) - *pos + 1;
}
static void
setup_pixel_info(struct screen_info *si, u32 pixels_per_scan_line,
efi_pixel_bitmask_t pixel_info, int pixel_format)
{
if (pixel_format == PIXEL_BIT_MASK) {
find_bits(pixel_info.red_mask,
&si->red_pos, &si->red_size);
find_bits(pixel_info.green_mask,
&si->green_pos, &si->green_size);
find_bits(pixel_info.blue_mask,
&si->blue_pos, &si->blue_size);
find_bits(pixel_info.reserved_mask,
&si->rsvd_pos, &si->rsvd_size);
si->lfb_depth = si->red_size + si->green_size +
si->blue_size + si->rsvd_size;
si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
} else {
if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
si->red_pos = 0;
si->blue_pos = 16;
} else /* PIXEL_BGR_RESERVED_8BIT_PER_COLOR */ {
si->blue_pos = 0;
si->red_pos = 16;
}
si->green_pos = 8;
si->rsvd_pos = 24;
si->red_size = si->green_size =
si->blue_size = si->rsvd_size = 8;
si->lfb_depth = 32;
si->lfb_linelength = pixels_per_scan_line * 4;
}
}
static efi_graphics_output_protocol_t *
find_gop(efi_guid_t *proto, unsigned long size, void **handles)
{
efi_graphics_output_protocol_t *first_gop;
efi_handle_t h;
int i;
first_gop = NULL;
for_each_efi_handle(h, handles, size, i) {
efi_status_t status;
efi_graphics_output_protocol_t *gop;
efi_graphics_output_protocol_mode_t *mode;
efi_graphics_output_mode_info_t *info;
efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
void *dummy = NULL;
status = efi_bs_call(handle_protocol, h, proto, (void **)&gop);
if (status != EFI_SUCCESS)
continue;
mode = efi_table_attr(gop, mode);
info = efi_table_attr(mode, info);
if (info->pixel_format == PIXEL_BLT_ONLY ||
info->pixel_format >= PIXEL_FORMAT_MAX)
continue;
/*
* Systems that use the UEFI Console Splitter may
* provide multiple GOP devices, not all of which are
* backed by real hardware. The workaround is to search
* for a GOP implementing the ConOut protocol, and if
* one isn't found, to just fall back to the first GOP.
*
* Once we've found a GOP supporting ConOut,
* don't bother looking any further.
*/
status = efi_bs_call(handle_protocol, h, &conout_proto, &dummy);
if (status == EFI_SUCCESS)
return gop;
if (!first_gop)
first_gop = gop;
}
return first_gop;
}
static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
unsigned long size, void **handles)
{
efi_graphics_output_protocol_t *gop;
efi_graphics_output_protocol_mode_t *mode;
efi_graphics_output_mode_info_t *info;
gop = find_gop(proto, size, handles);
/* Did we find any GOPs? */
if (!gop)
return EFI_NOT_FOUND;
/* Change mode if requested */
set_mode(gop);
/* EFI framebuffer */
mode = efi_table_attr(gop, mode);
info = efi_table_attr(mode, info);
si->orig_video_isVGA = VIDEO_TYPE_EFI;
si->lfb_width = info->horizontal_resolution;
si->lfb_height = info->vertical_resolution;
efi_set_u64_split(efi_table_attr(mode, frame_buffer_base),
&si->lfb_base, &si->ext_lfb_base);
if (si->ext_lfb_base)
si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
si->pages = 1;
setup_pixel_info(si, info->pixels_per_scan_line,
info->pixel_information, info->pixel_format);
si->lfb_size = si->lfb_linelength * si->lfb_height;
si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
return EFI_SUCCESS;
}
/*
* See if we have Graphics Output Protocol
*/
efi_status_t efi_setup_gop(struct screen_info *si, efi_guid_t *proto,
unsigned long size)
{
efi_status_t status;
void **gop_handle = NULL;
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
(void **)&gop_handle);
if (status != EFI_SUCCESS)
return status;
status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, proto, NULL,
&size, gop_handle);
if (status != EFI_SUCCESS)
goto free_handle;
status = setup_gop(si, proto, size, gop_handle);
free_handle:
efi_bs_call(free_pool, gop_handle);
return status;
}
| linux-master | drivers/firmware/efi/libstub/gop.c |
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/efi.h>
#include <asm/efi.h>
#include "efistub.h"
struct efi_unaccepted_memory *unaccepted_table;
efi_status_t allocate_unaccepted_bitmap(__u32 nr_desc,
struct efi_boot_memmap *map)
{
efi_guid_t unaccepted_table_guid = LINUX_EFI_UNACCEPTED_MEM_TABLE_GUID;
u64 unaccepted_start = ULLONG_MAX, unaccepted_end = 0, bitmap_size;
efi_status_t status;
int i;
/* Check if the table is already installed */
unaccepted_table = get_efi_config_table(unaccepted_table_guid);
if (unaccepted_table) {
if (unaccepted_table->version != 1) {
efi_err("Unknown version of unaccepted memory table\n");
return EFI_UNSUPPORTED;
}
return EFI_SUCCESS;
}
/* Check if there's any unaccepted memory and find the max address */
for (i = 0; i < nr_desc; i++) {
efi_memory_desc_t *d;
unsigned long m = (unsigned long)map->map;
d = efi_early_memdesc_ptr(m, map->desc_size, i);
if (d->type != EFI_UNACCEPTED_MEMORY)
continue;
unaccepted_start = min(unaccepted_start, d->phys_addr);
unaccepted_end = max(unaccepted_end,
d->phys_addr + d->num_pages * PAGE_SIZE);
}
if (unaccepted_start == ULLONG_MAX)
return EFI_SUCCESS;
unaccepted_start = round_down(unaccepted_start,
EFI_UNACCEPTED_UNIT_SIZE);
unaccepted_end = round_up(unaccepted_end, EFI_UNACCEPTED_UNIT_SIZE);
/*
* If unaccepted memory is present, allocate a bitmap to track what
* memory has to be accepted before access.
*
* One bit in the bitmap represents 2MiB in the address space:
* A 4k bitmap can track 64GiB of physical address space.
*
* In the worst case scenario -- a huge hole in the middle of the
* address space -- It needs 256MiB to handle 4PiB of the address
* space.
*
* The bitmap will be populated in setup_e820() according to the memory
* map after efi_exit_boot_services().
*/
bitmap_size = DIV_ROUND_UP(unaccepted_end - unaccepted_start,
EFI_UNACCEPTED_UNIT_SIZE * BITS_PER_BYTE);
status = efi_bs_call(allocate_pool, EFI_ACPI_RECLAIM_MEMORY,
sizeof(*unaccepted_table) + bitmap_size,
(void **)&unaccepted_table);
if (status != EFI_SUCCESS) {
efi_err("Failed to allocate unaccepted memory config table\n");
return status;
}
unaccepted_table->version = 1;
unaccepted_table->unit_size = EFI_UNACCEPTED_UNIT_SIZE;
unaccepted_table->phys_base = unaccepted_start;
unaccepted_table->size = bitmap_size;
memset(unaccepted_table->bitmap, 0, bitmap_size);
status = efi_bs_call(install_configuration_table,
&unaccepted_table_guid, unaccepted_table);
if (status != EFI_SUCCESS) {
efi_bs_call(free_pool, unaccepted_table);
efi_err("Failed to install unaccepted memory config table!\n");
}
return status;
}
/*
* The accepted memory bitmap only works at unit_size granularity. Take
* unaligned start/end addresses and either:
* 1. Accepts the memory immediately and in its entirety
* 2. Accepts unaligned parts, and marks *some* aligned part unaccepted
*
* The function will never reach the bitmap_set() with zero bits to set.
*/
void process_unaccepted_memory(u64 start, u64 end)
{
u64 unit_size = unaccepted_table->unit_size;
u64 unit_mask = unaccepted_table->unit_size - 1;
u64 bitmap_size = unaccepted_table->size;
/*
* Ensure that at least one bit will be set in the bitmap by
* immediately accepting all regions under 2*unit_size. This is
* imprecise and may immediately accept some areas that could
* have been represented in the bitmap. But, results in simpler
* code below
*
* Consider case like this (assuming unit_size == 2MB):
*
* | 4k | 2044k | 2048k |
* ^ 0x0 ^ 2MB ^ 4MB
*
* Only the first 4k has been accepted. The 0MB->2MB region can not be
* represented in the bitmap. The 2MB->4MB region can be represented in
* the bitmap. But, the 0MB->4MB region is <2*unit_size and will be
* immediately accepted in its entirety.
*/
if (end - start < 2 * unit_size) {
arch_accept_memory(start, end);
return;
}
/*
* No matter how the start and end are aligned, at least one unaccepted
* unit_size area will remain to be marked in the bitmap.
*/
/* Immediately accept a <unit_size piece at the start: */
if (start & unit_mask) {
arch_accept_memory(start, round_up(start, unit_size));
start = round_up(start, unit_size);
}
/* Immediately accept a <unit_size piece at the end: */
if (end & unit_mask) {
arch_accept_memory(round_down(end, unit_size), end);
end = round_down(end, unit_size);
}
/*
* Accept part of the range that before phys_base and cannot be recorded
* into the bitmap.
*/
if (start < unaccepted_table->phys_base) {
arch_accept_memory(start,
min(unaccepted_table->phys_base, end));
start = unaccepted_table->phys_base;
}
/* Nothing to record */
if (end < unaccepted_table->phys_base)
return;
/* Translate to offsets from the beginning of the bitmap */
start -= unaccepted_table->phys_base;
end -= unaccepted_table->phys_base;
/* Accept memory that doesn't fit into bitmap */
if (end > bitmap_size * unit_size * BITS_PER_BYTE) {
unsigned long phys_start, phys_end;
phys_start = bitmap_size * unit_size * BITS_PER_BYTE +
unaccepted_table->phys_base;
phys_end = end + unaccepted_table->phys_base;
arch_accept_memory(phys_start, phys_end);
end = bitmap_size * unit_size * BITS_PER_BYTE;
}
/*
* 'start' and 'end' are now both unit_size-aligned.
* Record the range as being unaccepted:
*/
bitmap_set(unaccepted_table->bitmap,
start / unit_size, (end - start) / unit_size);
}
void accept_memory(phys_addr_t start, phys_addr_t end)
{
unsigned long range_start, range_end;
unsigned long bitmap_size;
u64 unit_size;
if (!unaccepted_table)
return;
unit_size = unaccepted_table->unit_size;
/*
* Only care for the part of the range that is represented
* in the bitmap.
*/
if (start < unaccepted_table->phys_base)
start = unaccepted_table->phys_base;
if (end < unaccepted_table->phys_base)
return;
/* Translate to offsets from the beginning of the bitmap */
start -= unaccepted_table->phys_base;
end -= unaccepted_table->phys_base;
/* Make sure not to overrun the bitmap */
if (end > unaccepted_table->size * unit_size * BITS_PER_BYTE)
end = unaccepted_table->size * unit_size * BITS_PER_BYTE;
range_start = start / unit_size;
bitmap_size = DIV_ROUND_UP(end, unit_size);
for_each_set_bitrange_from(range_start, range_end,
unaccepted_table->bitmap, bitmap_size) {
unsigned long phys_start, phys_end;
phys_start = range_start * unit_size + unaccepted_table->phys_base;
phys_end = range_end * unit_size + unaccepted_table->phys_base;
arch_accept_memory(phys_start, phys_end);
bitmap_clear(unaccepted_table->bitmap,
range_start, range_end - range_start);
}
}
| linux-master | drivers/firmware/efi/libstub/unaccepted_memory.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2013, 2014 Linaro Ltd; <[email protected]>
*
* This file implements the EFI boot stub for the arm64 kernel.
* Adapted from ARM version by Mark Salter <[email protected]>
*/
#include <linux/efi.h>
#include <asm/efi.h>
#include <asm/image.h>
#include <asm/memory.h>
#include <asm/sysreg.h>
#include "efistub.h"
static bool system_needs_vamap(void)
{
const struct efi_smbios_type4_record *record;
const u32 __aligned(1) *socid;
const u8 *version;
/*
* Ampere eMAG, Altra, and Altra Max machines crash in SetTime() if
* SetVirtualAddressMap() has not been called prior. Most Altra systems
* can be identified by the SMCCC soc ID, which is conveniently exposed
* via the type 4 SMBIOS records. Otherwise, test the processor version
* field. eMAG systems all appear to have the processor version field
* set to "eMAG".
*/
record = (struct efi_smbios_type4_record *)efi_get_smbios_record(4);
if (!record)
return false;
socid = (u32 *)record->processor_id;
switch (*socid & 0xffff000f) {
static char const altra[] = "Ampere(TM) Altra(TM) Processor";
static char const emag[] = "eMAG";
default:
version = efi_get_smbios_string(&record->header, 4,
processor_version);
if (!version || (strncmp(version, altra, sizeof(altra) - 1) &&
strncmp(version, emag, sizeof(emag) - 1)))
break;
fallthrough;
case 0x0a160001: // Altra
case 0x0a160002: // Altra Max
efi_warn("Working around broken SetVirtualAddressMap()\n");
return true;
}
return false;
}
efi_status_t check_platform_features(void)
{
u64 tg;
/*
* If we have 48 bits of VA space for TTBR0 mappings, we can map the
* UEFI runtime regions 1:1 and so calling SetVirtualAddressMap() is
* unnecessary.
*/
if (VA_BITS_MIN >= 48 && !system_needs_vamap())
efi_novamap = true;
/* UEFI mandates support for 4 KB granularity, no need to check */
if (IS_ENABLED(CONFIG_ARM64_4K_PAGES))
return EFI_SUCCESS;
tg = (read_cpuid(ID_AA64MMFR0_EL1) >> ID_AA64MMFR0_EL1_TGRAN_SHIFT) & 0xf;
if (tg < ID_AA64MMFR0_EL1_TGRAN_SUPPORTED_MIN || tg > ID_AA64MMFR0_EL1_TGRAN_SUPPORTED_MAX) {
if (IS_ENABLED(CONFIG_ARM64_64K_PAGES))
efi_err("This 64 KB granular kernel is not supported by your CPU\n");
else
efi_err("This 16 KB granular kernel is not supported by your CPU\n");
return EFI_UNSUPPORTED;
}
return EFI_SUCCESS;
}
#ifdef CONFIG_ARM64_WORKAROUND_CLEAN_CACHE
#define DCTYPE "civac"
#else
#define DCTYPE "cvau"
#endif
u32 __weak code_size;
void efi_cache_sync_image(unsigned long image_base,
unsigned long alloc_size)
{
u32 ctr = read_cpuid_effective_cachetype();
u64 lsize = 4 << cpuid_feature_extract_unsigned_field(ctr,
CTR_EL0_DminLine_SHIFT);
/* only perform the cache maintenance if needed for I/D coherency */
if (!(ctr & BIT(CTR_EL0_IDC_SHIFT))) {
unsigned long base = image_base;
unsigned long size = code_size;
do {
asm("dc " DCTYPE ", %0" :: "r"(base));
base += lsize;
size -= lsize;
} while (size >= lsize);
}
asm("ic ialluis");
dsb(ish);
isb();
efi_remap_image(image_base, alloc_size, code_size);
}
unsigned long __weak primary_entry_offset(void)
{
/*
* By default, we can invoke the kernel via the branch instruction in
* the image header, so offset #0. This will be overridden by the EFI
* stub build that is linked into the core kernel, as in that case, the
* image header may not have been loaded into memory, or may be mapped
* with non-executable permissions.
*/
return 0;
}
void __noreturn efi_enter_kernel(unsigned long entrypoint,
unsigned long fdt_addr,
unsigned long fdt_size)
{
void (* __noreturn enter_kernel)(u64, u64, u64, u64);
enter_kernel = (void *)entrypoint + primary_entry_offset();
enter_kernel(fdt_addr, 0, 0, 0);
}
| linux-master | drivers/firmware/efi/libstub/arm64.c |
// SPDX-License-Identifier: GPL-2.0
#include <linux/efi.h>
#include <asm/efi.h>
#include "efistub.h"
const efi_system_table_t *efi_system_table;
| linux-master | drivers/firmware/efi/libstub/systable.c |
#include <linux/bitmap.h>
void __bitmap_set(unsigned long *map, unsigned int start, int len)
{
unsigned long *p = map + BIT_WORD(start);
const unsigned int size = start + len;
int bits_to_set = BITS_PER_LONG - (start % BITS_PER_LONG);
unsigned long mask_to_set = BITMAP_FIRST_WORD_MASK(start);
while (len - bits_to_set >= 0) {
*p |= mask_to_set;
len -= bits_to_set;
bits_to_set = BITS_PER_LONG;
mask_to_set = ~0UL;
p++;
}
if (len) {
mask_to_set &= BITMAP_LAST_WORD_MASK(size);
*p |= mask_to_set;
}
}
void __bitmap_clear(unsigned long *map, unsigned int start, int len)
{
unsigned long *p = map + BIT_WORD(start);
const unsigned int size = start + len;
int bits_to_clear = BITS_PER_LONG - (start % BITS_PER_LONG);
unsigned long mask_to_clear = BITMAP_FIRST_WORD_MASK(start);
while (len - bits_to_clear >= 0) {
*p &= ~mask_to_clear;
len -= bits_to_clear;
bits_to_clear = BITS_PER_LONG;
mask_to_clear = ~0UL;
p++;
}
if (len) {
mask_to_clear &= BITMAP_LAST_WORD_MASK(size);
*p &= ~mask_to_clear;
}
}
| linux-master | drivers/firmware/efi/libstub/bitmap.c |
// SPDX-License-Identifier: GPL-2.0
/*
* PCI-related functions used by the EFI stub on multiple
* architectures.
*
* Copyright 2019 Google, LLC
*/
#include <linux/efi.h>
#include <linux/pci.h>
#include <asm/efi.h>
#include "efistub.h"
void efi_pci_disable_bridge_busmaster(void)
{
efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
unsigned long pci_handle_size = 0;
efi_handle_t *pci_handle = NULL;
efi_handle_t handle;
efi_status_t status;
u16 class, command;
int i;
status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, &pci_proto,
NULL, &pci_handle_size, NULL);
if (status != EFI_BUFFER_TOO_SMALL) {
if (status != EFI_SUCCESS && status != EFI_NOT_FOUND)
efi_err("Failed to locate PCI I/O handles'\n");
return;
}
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, pci_handle_size,
(void **)&pci_handle);
if (status != EFI_SUCCESS) {
efi_err("Failed to allocate memory for 'pci_handle'\n");
return;
}
status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, &pci_proto,
NULL, &pci_handle_size, pci_handle);
if (status != EFI_SUCCESS) {
efi_err("Failed to locate PCI I/O handles'\n");
goto free_handle;
}
for_each_efi_handle(handle, pci_handle, pci_handle_size, i) {
efi_pci_io_protocol_t *pci;
unsigned long segment_nr, bus_nr, device_nr, func_nr;
status = efi_bs_call(handle_protocol, handle, &pci_proto,
(void **)&pci);
if (status != EFI_SUCCESS)
continue;
/*
* Disregard devices living on bus 0 - these are not behind a
* bridge so no point in disconnecting them from their drivers.
*/
status = efi_call_proto(pci, get_location, &segment_nr, &bus_nr,
&device_nr, &func_nr);
if (status != EFI_SUCCESS || bus_nr == 0)
continue;
/*
* Don't disconnect VGA controllers so we don't risk losing
* access to the framebuffer. Drivers for true PCIe graphics
* controllers that are behind a PCIe root port do not use
* DMA to implement the GOP framebuffer anyway [although they
* may use it in their implementation of Gop->Blt()], and so
* disabling DMA in the PCI bridge should not interfere with
* normal operation of the device.
*/
status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
PCI_CLASS_DEVICE, 1, &class);
if (status != EFI_SUCCESS || class == PCI_CLASS_DISPLAY_VGA)
continue;
/* Disconnect this handle from all its drivers */
efi_bs_call(disconnect_controller, handle, NULL, NULL);
}
for_each_efi_handle(handle, pci_handle, pci_handle_size, i) {
efi_pci_io_protocol_t *pci;
status = efi_bs_call(handle_protocol, handle, &pci_proto,
(void **)&pci);
if (status != EFI_SUCCESS || !pci)
continue;
status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
PCI_CLASS_DEVICE, 1, &class);
if (status != EFI_SUCCESS || class != PCI_CLASS_BRIDGE_PCI)
continue;
/* Disable busmastering */
status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
PCI_COMMAND, 1, &command);
if (status != EFI_SUCCESS || !(command & PCI_COMMAND_MASTER))
continue;
command &= ~PCI_COMMAND_MASTER;
status = efi_call_proto(pci, pci.write, EfiPciIoWidthUint16,
PCI_COMMAND, 1, &command);
if (status != EFI_SUCCESS)
efi_err("Failed to disable PCI busmastering\n");
}
free_handle:
efi_bs_call(free_pool, pci_handle);
}
| linux-master | drivers/firmware/efi/libstub/pci.c |
// SPDX-License-Identifier: GPL-2.0
#include <linux/efi.h>
#include <asm/efi.h>
#include "efistub.h"
/**
* efi_get_memory_map() - get memory map
* @map: pointer to memory map pointer to which to assign the
* newly allocated memory map
* @install_cfg_tbl: whether or not to install the boot memory map as a
* configuration table
*
* Retrieve the UEFI memory map. The allocated memory leaves room for
* up to EFI_MMAP_NR_SLACK_SLOTS additional memory map entries.
*
* Return: status code
*/
efi_status_t efi_get_memory_map(struct efi_boot_memmap **map,
bool install_cfg_tbl)
{
int memtype = install_cfg_tbl ? EFI_ACPI_RECLAIM_MEMORY
: EFI_LOADER_DATA;
efi_guid_t tbl_guid = LINUX_EFI_BOOT_MEMMAP_GUID;
struct efi_boot_memmap *m, tmp;
efi_status_t status;
unsigned long size;
tmp.map_size = 0;
status = efi_bs_call(get_memory_map, &tmp.map_size, NULL, &tmp.map_key,
&tmp.desc_size, &tmp.desc_ver);
if (status != EFI_BUFFER_TOO_SMALL)
return EFI_LOAD_ERROR;
size = tmp.map_size + tmp.desc_size * EFI_MMAP_NR_SLACK_SLOTS;
status = efi_bs_call(allocate_pool, memtype, sizeof(*m) + size,
(void **)&m);
if (status != EFI_SUCCESS)
return status;
if (install_cfg_tbl) {
/*
* Installing a configuration table might allocate memory, and
* this may modify the memory map. This means we should install
* the configuration table first, and re-install or delete it
* as needed.
*/
status = efi_bs_call(install_configuration_table, &tbl_guid, m);
if (status != EFI_SUCCESS)
goto free_map;
}
m->buff_size = m->map_size = size;
status = efi_bs_call(get_memory_map, &m->map_size, m->map, &m->map_key,
&m->desc_size, &m->desc_ver);
if (status != EFI_SUCCESS)
goto uninstall_table;
*map = m;
return EFI_SUCCESS;
uninstall_table:
if (install_cfg_tbl)
efi_bs_call(install_configuration_table, &tbl_guid, NULL);
free_map:
efi_bs_call(free_pool, m);
return status;
}
/**
* efi_allocate_pages() - Allocate memory pages
* @size: minimum number of bytes to allocate
* @addr: On return the address of the first allocated page. The first
* allocated page has alignment EFI_ALLOC_ALIGN which is an
* architecture dependent multiple of the page size.
* @max: the address that the last allocated memory page shall not
* exceed
*
* Allocate pages as EFI_LOADER_DATA. The allocated pages are aligned according
* to EFI_ALLOC_ALIGN. The last allocated page will not exceed the address
* given by @max.
*
* Return: status code
*/
efi_status_t efi_allocate_pages(unsigned long size, unsigned long *addr,
unsigned long max)
{
efi_physical_addr_t alloc_addr;
efi_status_t status;
max = min(max, EFI_ALLOC_LIMIT);
if (EFI_ALLOC_ALIGN > EFI_PAGE_SIZE)
return efi_allocate_pages_aligned(size, addr, max,
EFI_ALLOC_ALIGN,
EFI_LOADER_DATA);
alloc_addr = ALIGN_DOWN(max + 1, EFI_ALLOC_ALIGN) - 1;
status = efi_bs_call(allocate_pages, EFI_ALLOCATE_MAX_ADDRESS,
EFI_LOADER_DATA, DIV_ROUND_UP(size, EFI_PAGE_SIZE),
&alloc_addr);
if (status != EFI_SUCCESS)
return status;
*addr = alloc_addr;
return EFI_SUCCESS;
}
/**
* efi_free() - free memory pages
* @size: size of the memory area to free in bytes
* @addr: start of the memory area to free (must be EFI_PAGE_SIZE
* aligned)
*
* @size is rounded up to a multiple of EFI_ALLOC_ALIGN which is an
* architecture specific multiple of EFI_PAGE_SIZE. So this function should
* only be used to return pages allocated with efi_allocate_pages() or
* efi_low_alloc_above().
*/
void efi_free(unsigned long size, unsigned long addr)
{
unsigned long nr_pages;
if (!size)
return;
nr_pages = round_up(size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE;
efi_bs_call(free_pages, addr, nr_pages);
}
| linux-master | drivers/firmware/efi/libstub/mem.c |
// SPDX-License-Identifier: GPL-2.0
#include <linux/efi.h>
#include <linux/pe.h>
#include <asm/efi.h>
#include <asm/unaligned.h>
#include "efistub.h"
static unsigned char zboot_heap[SZ_256K] __aligned(64);
static unsigned long free_mem_ptr, free_mem_end_ptr;
#define STATIC static
#if defined(CONFIG_KERNEL_GZIP)
#include "../../../../lib/decompress_inflate.c"
#elif defined(CONFIG_KERNEL_LZ4)
#include "../../../../lib/decompress_unlz4.c"
#elif defined(CONFIG_KERNEL_LZMA)
#include "../../../../lib/decompress_unlzma.c"
#elif defined(CONFIG_KERNEL_LZO)
#include "../../../../lib/decompress_unlzo.c"
#elif defined(CONFIG_KERNEL_XZ)
#undef memcpy
#define memcpy memcpy
#undef memmove
#define memmove memmove
#include "../../../../lib/decompress_unxz.c"
#elif defined(CONFIG_KERNEL_ZSTD)
#include "../../../../lib/decompress_unzstd.c"
#endif
extern char efi_zboot_header[];
extern char _gzdata_start[], _gzdata_end[];
static void error(char *x)
{
efi_err("EFI decompressor: %s\n", x);
}
static unsigned long alloc_preferred_address(unsigned long alloc_size)
{
#ifdef EFI_KIMG_PREFERRED_ADDRESS
efi_physical_addr_t efi_addr = EFI_KIMG_PREFERRED_ADDRESS;
if (efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
alloc_size / EFI_PAGE_SIZE, &efi_addr) == EFI_SUCCESS)
return efi_addr;
#endif
return ULONG_MAX;
}
void __weak efi_cache_sync_image(unsigned long image_base,
unsigned long alloc_size)
{
// Provided by the arch to perform the cache maintenance necessary for
// executable code loaded into memory to be safe for execution.
}
struct screen_info *alloc_screen_info(void)
{
return __alloc_screen_info();
}
asmlinkage efi_status_t __efiapi
efi_zboot_entry(efi_handle_t handle, efi_system_table_t *systab)
{
unsigned long compressed_size = _gzdata_end - _gzdata_start;
unsigned long image_base, alloc_size;
efi_loaded_image_t *image;
efi_status_t status;
char *cmdline_ptr;
int ret;
WRITE_ONCE(efi_system_table, systab);
free_mem_ptr = (unsigned long)&zboot_heap;
free_mem_end_ptr = free_mem_ptr + sizeof(zboot_heap);
status = efi_bs_call(handle_protocol, handle,
&LOADED_IMAGE_PROTOCOL_GUID, (void **)&image);
if (status != EFI_SUCCESS) {
error("Failed to locate parent's loaded image protocol");
return status;
}
status = efi_handle_cmdline(image, &cmdline_ptr);
if (status != EFI_SUCCESS)
return status;
efi_info("Decompressing Linux Kernel...\n");
// SizeOfImage from the compressee's PE/COFF header
alloc_size = round_up(get_unaligned_le32(_gzdata_end - 4),
EFI_ALLOC_ALIGN);
// If the architecture has a preferred address for the image,
// try that first.
image_base = alloc_preferred_address(alloc_size);
if (image_base == ULONG_MAX) {
unsigned long min_kimg_align = efi_get_kimg_min_align();
u32 seed = U32_MAX;
if (!IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
// Setting the random seed to 0x0 is the same as
// allocating as low as possible
seed = 0;
} else if (efi_nokaslr) {
efi_info("KASLR disabled on kernel command line\n");
} else {
status = efi_get_random_bytes(sizeof(seed), (u8 *)&seed);
if (status == EFI_NOT_FOUND) {
efi_info("EFI_RNG_PROTOCOL unavailable\n");
efi_nokaslr = true;
} else if (status != EFI_SUCCESS) {
efi_err("efi_get_random_bytes() failed (0x%lx)\n",
status);
efi_nokaslr = true;
}
}
status = efi_random_alloc(alloc_size, min_kimg_align, &image_base,
seed, EFI_LOADER_CODE, EFI_ALLOC_LIMIT);
if (status != EFI_SUCCESS) {
efi_err("Failed to allocate memory\n");
goto free_cmdline;
}
}
// Decompress the payload into the newly allocated buffer.
ret = __decompress(_gzdata_start, compressed_size, NULL, NULL,
(void *)image_base, alloc_size, NULL, error);
if (ret < 0) {
error("Decompression failed");
status = EFI_DEVICE_ERROR;
goto free_image;
}
efi_cache_sync_image(image_base, alloc_size);
status = efi_stub_common(handle, image, image_base, cmdline_ptr);
free_image:
efi_free(alloc_size, image_base);
free_cmdline:
efi_bs_call(free_pool, cmdline_ptr);
return status;
}
| linux-master | drivers/firmware/efi/libstub/zboot.c |
// SPDX-License-Identifier: GPL-2.0
/*
* FDT related Helper functions used by the EFI stub on multiple
* architectures. This should be #included by the EFI stub
* implementation files.
*
* Copyright 2013 Linaro Limited; author Roy Franz
*/
#include <linux/efi.h>
#include <linux/libfdt.h>
#include <asm/efi.h>
#include "efistub.h"
#define EFI_DT_ADDR_CELLS_DEFAULT 2
#define EFI_DT_SIZE_CELLS_DEFAULT 2
static void fdt_update_cell_size(void *fdt)
{
int offset;
offset = fdt_path_offset(fdt, "/");
/* Set the #address-cells and #size-cells values for an empty tree */
fdt_setprop_u32(fdt, offset, "#address-cells", EFI_DT_ADDR_CELLS_DEFAULT);
fdt_setprop_u32(fdt, offset, "#size-cells", EFI_DT_SIZE_CELLS_DEFAULT);
}
static efi_status_t update_fdt(void *orig_fdt, unsigned long orig_fdt_size,
void *fdt, int new_fdt_size, char *cmdline_ptr)
{
int node, num_rsv;
int status;
u32 fdt_val32;
u64 fdt_val64;
/* Do some checks on provided FDT, if it exists: */
if (orig_fdt) {
if (fdt_check_header(orig_fdt)) {
efi_err("Device Tree header not valid!\n");
return EFI_LOAD_ERROR;
}
/*
* We don't get the size of the FDT if we get if from a
* configuration table:
*/
if (orig_fdt_size && fdt_totalsize(orig_fdt) > orig_fdt_size) {
efi_err("Truncated device tree! foo!\n");
return EFI_LOAD_ERROR;
}
}
if (orig_fdt) {
status = fdt_open_into(orig_fdt, fdt, new_fdt_size);
} else {
status = fdt_create_empty_tree(fdt, new_fdt_size);
if (status == 0) {
/*
* Any failure from the following function is
* non-critical:
*/
fdt_update_cell_size(fdt);
}
}
if (status != 0)
goto fdt_set_fail;
/*
* Delete all memory reserve map entries. When booting via UEFI,
* kernel will use the UEFI memory map to find reserved regions.
*/
num_rsv = fdt_num_mem_rsv(fdt);
while (num_rsv-- > 0)
fdt_del_mem_rsv(fdt, num_rsv);
node = fdt_subnode_offset(fdt, 0, "chosen");
if (node < 0) {
node = fdt_add_subnode(fdt, 0, "chosen");
if (node < 0) {
/* 'node' is an error code when negative: */
status = node;
goto fdt_set_fail;
}
}
if (cmdline_ptr != NULL && strlen(cmdline_ptr) > 0) {
status = fdt_setprop(fdt, node, "bootargs", cmdline_ptr,
strlen(cmdline_ptr) + 1);
if (status)
goto fdt_set_fail;
}
/* Add FDT entries for EFI runtime services in chosen node. */
node = fdt_subnode_offset(fdt, 0, "chosen");
fdt_val64 = cpu_to_fdt64((u64)(unsigned long)efi_system_table);
status = fdt_setprop_var(fdt, node, "linux,uefi-system-table", fdt_val64);
if (status)
goto fdt_set_fail;
fdt_val64 = U64_MAX; /* placeholder */
status = fdt_setprop_var(fdt, node, "linux,uefi-mmap-start", fdt_val64);
if (status)
goto fdt_set_fail;
fdt_val32 = U32_MAX; /* placeholder */
status = fdt_setprop_var(fdt, node, "linux,uefi-mmap-size", fdt_val32);
if (status)
goto fdt_set_fail;
status = fdt_setprop_var(fdt, node, "linux,uefi-mmap-desc-size", fdt_val32);
if (status)
goto fdt_set_fail;
status = fdt_setprop_var(fdt, node, "linux,uefi-mmap-desc-ver", fdt_val32);
if (status)
goto fdt_set_fail;
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && !efi_nokaslr) {
efi_status_t efi_status;
efi_status = efi_get_random_bytes(sizeof(fdt_val64),
(u8 *)&fdt_val64);
if (efi_status == EFI_SUCCESS) {
status = fdt_setprop_var(fdt, node, "kaslr-seed", fdt_val64);
if (status)
goto fdt_set_fail;
}
}
/* Shrink the FDT back to its minimum size: */
fdt_pack(fdt);
return EFI_SUCCESS;
fdt_set_fail:
if (status == -FDT_ERR_NOSPACE)
return EFI_BUFFER_TOO_SMALL;
return EFI_LOAD_ERROR;
}
static efi_status_t update_fdt_memmap(void *fdt, struct efi_boot_memmap *map)
{
int node = fdt_path_offset(fdt, "/chosen");
u64 fdt_val64;
u32 fdt_val32;
int err;
if (node < 0)
return EFI_LOAD_ERROR;
fdt_val64 = cpu_to_fdt64((unsigned long)map->map);
err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-start", fdt_val64);
if (err)
return EFI_LOAD_ERROR;
fdt_val32 = cpu_to_fdt32(map->map_size);
err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-size", fdt_val32);
if (err)
return EFI_LOAD_ERROR;
fdt_val32 = cpu_to_fdt32(map->desc_size);
err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-desc-size", fdt_val32);
if (err)
return EFI_LOAD_ERROR;
fdt_val32 = cpu_to_fdt32(map->desc_ver);
err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-desc-ver", fdt_val32);
if (err)
return EFI_LOAD_ERROR;
return EFI_SUCCESS;
}
struct exit_boot_struct {
struct efi_boot_memmap *boot_memmap;
efi_memory_desc_t *runtime_map;
int runtime_entry_count;
void *new_fdt_addr;
};
static efi_status_t exit_boot_func(struct efi_boot_memmap *map, void *priv)
{
struct exit_boot_struct *p = priv;
p->boot_memmap = map;
/*
* Update the memory map with virtual addresses. The function will also
* populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
* entries so that we can pass it straight to SetVirtualAddressMap()
*/
efi_get_virtmap(map->map, map->map_size, map->desc_size,
p->runtime_map, &p->runtime_entry_count);
return update_fdt_memmap(p->new_fdt_addr, map);
}
#ifndef MAX_FDT_SIZE
# define MAX_FDT_SIZE SZ_2M
#endif
/*
* Allocate memory for a new FDT, then add EFI and commandline related fields
* to the FDT. This routine increases the FDT allocation size until the
* allocated memory is large enough. EFI allocations are in EFI_PAGE_SIZE
* granules, which are fixed at 4K bytes, so in most cases the first allocation
* should succeed. EFI boot services are exited at the end of this function.
* There must be no allocations between the get_memory_map() call and the
* exit_boot_services() call, so the exiting of boot services is very tightly
* tied to the creation of the FDT with the final memory map in it.
*/
static
efi_status_t allocate_new_fdt_and_exit_boot(void *handle,
efi_loaded_image_t *image,
unsigned long *new_fdt_addr,
char *cmdline_ptr)
{
unsigned long desc_size;
u32 desc_ver;
efi_status_t status;
struct exit_boot_struct priv;
unsigned long fdt_addr = 0;
unsigned long fdt_size = 0;
if (!efi_novamap) {
status = efi_alloc_virtmap(&priv.runtime_map, &desc_size,
&desc_ver);
if (status != EFI_SUCCESS) {
efi_err("Unable to retrieve UEFI memory map.\n");
return status;
}
}
/*
* Unauthenticated device tree data is a security hazard, so ignore
* 'dtb=' unless UEFI Secure Boot is disabled. We assume that secure
* boot is enabled if we can't determine its state.
*/
if (!IS_ENABLED(CONFIG_EFI_ARMSTUB_DTB_LOADER) ||
efi_get_secureboot() != efi_secureboot_mode_disabled) {
if (strstr(cmdline_ptr, "dtb="))
efi_err("Ignoring DTB from command line.\n");
} else {
status = efi_load_dtb(image, &fdt_addr, &fdt_size);
if (status != EFI_SUCCESS && status != EFI_NOT_READY) {
efi_err("Failed to load device tree!\n");
goto fail;
}
}
if (fdt_addr) {
efi_info("Using DTB from command line\n");
} else {
/* Look for a device tree configuration table entry. */
fdt_addr = (uintptr_t)get_fdt(&fdt_size);
if (fdt_addr)
efi_info("Using DTB from configuration table\n");
}
if (!fdt_addr)
efi_info("Generating empty DTB\n");
efi_info("Exiting boot services...\n");
status = efi_allocate_pages(MAX_FDT_SIZE, new_fdt_addr, ULONG_MAX);
if (status != EFI_SUCCESS) {
efi_err("Unable to allocate memory for new device tree.\n");
goto fail;
}
status = update_fdt((void *)fdt_addr, fdt_size,
(void *)*new_fdt_addr, MAX_FDT_SIZE, cmdline_ptr);
if (status != EFI_SUCCESS) {
efi_err("Unable to construct new device tree.\n");
goto fail_free_new_fdt;
}
priv.new_fdt_addr = (void *)*new_fdt_addr;
status = efi_exit_boot_services(handle, &priv, exit_boot_func);
if (status == EFI_SUCCESS) {
efi_set_virtual_address_map_t *svam;
if (efi_novamap)
return EFI_SUCCESS;
/* Install the new virtual address map */
svam = efi_system_table->runtime->set_virtual_address_map;
status = svam(priv.runtime_entry_count * desc_size, desc_size,
desc_ver, priv.runtime_map);
/*
* We are beyond the point of no return here, so if the call to
* SetVirtualAddressMap() failed, we need to signal that to the
* incoming kernel but proceed normally otherwise.
*/
if (status != EFI_SUCCESS) {
efi_memory_desc_t *p;
int l;
/*
* Set the virtual address field of all
* EFI_MEMORY_RUNTIME entries to U64_MAX. This will
* signal the incoming kernel that no virtual
* translation has been installed.
*/
for (l = 0; l < priv.boot_memmap->map_size;
l += priv.boot_memmap->desc_size) {
p = (void *)priv.boot_memmap->map + l;
if (p->attribute & EFI_MEMORY_RUNTIME)
p->virt_addr = U64_MAX;
}
}
return EFI_SUCCESS;
}
efi_err("Exit boot services failed.\n");
fail_free_new_fdt:
efi_free(MAX_FDT_SIZE, *new_fdt_addr);
fail:
efi_free(fdt_size, fdt_addr);
efi_bs_call(free_pool, priv.runtime_map);
return EFI_LOAD_ERROR;
}
efi_status_t efi_boot_kernel(void *handle, efi_loaded_image_t *image,
unsigned long kernel_addr, char *cmdline_ptr)
{
unsigned long fdt_addr;
efi_status_t status;
status = allocate_new_fdt_and_exit_boot(handle, image, &fdt_addr,
cmdline_ptr);
if (status != EFI_SUCCESS) {
efi_err("Failed to update FDT and exit boot services\n");
return status;
}
if (IS_ENABLED(CONFIG_ARM))
efi_handle_post_ebs_state();
efi_enter_kernel(kernel_addr, fdt_addr, fdt_totalsize((void *)fdt_addr));
/* not reached */
}
void *get_fdt(unsigned long *fdt_size)
{
void *fdt;
fdt = get_efi_config_table(DEVICE_TREE_GUID);
if (!fdt)
return NULL;
if (fdt_check_header(fdt) != 0) {
efi_err("Invalid header detected on UEFI supplied FDT, ignoring ...\n");
return NULL;
}
*fdt_size = fdt_totalsize(fdt);
return fdt;
}
| linux-master | drivers/firmware/efi/libstub/fdt.c |
// SPDX-License-Identifier: GPL-2.0
#include <linux/efi.h>
#include <asm/efi.h>
#include "efistub.h"
/**
* efi_low_alloc_above() - allocate pages at or above given address
* @size: size of the memory area to allocate
* @align: minimum alignment of the allocated memory area. It should
* a power of two.
* @addr: on exit the address of the allocated memory
* @min: minimum address to used for the memory allocation
*
* Allocate at the lowest possible address that is not below @min as
* EFI_LOADER_DATA. The allocated pages are aligned according to @align but at
* least EFI_ALLOC_ALIGN. The first allocated page will not below the address
* given by @min.
*
* Return: status code
*/
efi_status_t efi_low_alloc_above(unsigned long size, unsigned long align,
unsigned long *addr, unsigned long min)
{
struct efi_boot_memmap *map;
efi_status_t status;
unsigned long nr_pages;
int i;
status = efi_get_memory_map(&map, false);
if (status != EFI_SUCCESS)
goto fail;
/*
* Enforce minimum alignment that EFI or Linux requires when
* requesting a specific address. We are doing page-based (or
* larger) allocations, and both the address and size must meet
* alignment constraints.
*/
if (align < EFI_ALLOC_ALIGN)
align = EFI_ALLOC_ALIGN;
size = round_up(size, EFI_ALLOC_ALIGN);
nr_pages = size / EFI_PAGE_SIZE;
for (i = 0; i < map->map_size / map->desc_size; i++) {
efi_memory_desc_t *desc;
unsigned long m = (unsigned long)map->map;
u64 start, end;
desc = efi_early_memdesc_ptr(m, map->desc_size, i);
if (desc->type != EFI_CONVENTIONAL_MEMORY)
continue;
if (efi_soft_reserve_enabled() &&
(desc->attribute & EFI_MEMORY_SP))
continue;
if (desc->num_pages < nr_pages)
continue;
start = desc->phys_addr;
end = start + desc->num_pages * EFI_PAGE_SIZE;
if (start < min)
start = min;
start = round_up(start, align);
if ((start + size) > end)
continue;
status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS,
EFI_LOADER_DATA, nr_pages, &start);
if (status == EFI_SUCCESS) {
*addr = start;
break;
}
}
if (i == map->map_size / map->desc_size)
status = EFI_NOT_FOUND;
efi_bs_call(free_pool, map);
fail:
return status;
}
/**
* efi_relocate_kernel() - copy memory area
* @image_addr: pointer to address of memory area to copy
* @image_size: size of memory area to copy
* @alloc_size: minimum size of memory to allocate, must be greater or
* equal to image_size
* @preferred_addr: preferred target address
* @alignment: minimum alignment of the allocated memory area. It
* should be a power of two.
* @min_addr: minimum target address
*
* Copy a memory area to a newly allocated memory area aligned according
* to @alignment but at least EFI_ALLOC_ALIGN. If the preferred address
* is not available, the allocated address will not be below @min_addr.
* On exit, @image_addr is updated to the target copy address that was used.
*
* This function is used to copy the Linux kernel verbatim. It does not apply
* any relocation changes.
*
* Return: status code
*/
efi_status_t efi_relocate_kernel(unsigned long *image_addr,
unsigned long image_size,
unsigned long alloc_size,
unsigned long preferred_addr,
unsigned long alignment,
unsigned long min_addr)
{
unsigned long cur_image_addr;
unsigned long new_addr = 0;
efi_status_t status;
unsigned long nr_pages;
efi_physical_addr_t efi_addr = preferred_addr;
if (!image_addr || !image_size || !alloc_size)
return EFI_INVALID_PARAMETER;
if (alloc_size < image_size)
return EFI_INVALID_PARAMETER;
cur_image_addr = *image_addr;
/*
* The EFI firmware loader could have placed the kernel image
* anywhere in memory, but the kernel has restrictions on the
* max physical address it can run at. Some architectures
* also have a preferred address, so first try to relocate
* to the preferred address. If that fails, allocate as low
* as possible while respecting the required alignment.
*/
nr_pages = round_up(alloc_size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE;
status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS,
EFI_LOADER_DATA, nr_pages, &efi_addr);
new_addr = efi_addr;
/*
* If preferred address allocation failed allocate as low as
* possible.
*/
if (status != EFI_SUCCESS) {
status = efi_low_alloc_above(alloc_size, alignment, &new_addr,
min_addr);
}
if (status != EFI_SUCCESS) {
efi_err("Failed to allocate usable memory for kernel.\n");
return status;
}
/*
* We know source/dest won't overlap since both memory ranges
* have been allocated by UEFI, so we can safely use memcpy.
*/
memcpy((void *)new_addr, (void *)cur_image_addr, image_size);
/* Return the new address of the relocated image. */
*image_addr = new_addr;
return status;
}
| linux-master | drivers/firmware/efi/libstub/relocate.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Author: Yun Liu <[email protected]>
* Huacai Chen <[email protected]>
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <asm/efi.h>
#include <asm/addrspace.h>
#include "efistub.h"
typedef void __noreturn (*kernel_entry_t)(bool efi, unsigned long cmdline,
unsigned long systab);
efi_status_t check_platform_features(void)
{
return EFI_SUCCESS;
}
struct exit_boot_struct {
efi_memory_desc_t *runtime_map;
int runtime_entry_count;
};
static efi_status_t exit_boot_func(struct efi_boot_memmap *map, void *priv)
{
struct exit_boot_struct *p = priv;
/*
* Update the memory map with virtual addresses. The function will also
* populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
* entries so that we can pass it straight to SetVirtualAddressMap()
*/
efi_get_virtmap(map->map, map->map_size, map->desc_size,
p->runtime_map, &p->runtime_entry_count);
return EFI_SUCCESS;
}
unsigned long __weak kernel_entry_address(void)
{
return *(unsigned long *)(PHYSADDR(VMLINUX_LOAD_ADDRESS) + 8);
}
efi_status_t efi_boot_kernel(void *handle, efi_loaded_image_t *image,
unsigned long kernel_addr, char *cmdline_ptr)
{
kernel_entry_t real_kernel_entry;
struct exit_boot_struct priv;
unsigned long desc_size;
efi_status_t status;
u32 desc_ver;
status = efi_alloc_virtmap(&priv.runtime_map, &desc_size, &desc_ver);
if (status != EFI_SUCCESS) {
efi_err("Unable to retrieve UEFI memory map.\n");
return status;
}
efi_info("Exiting boot services\n");
efi_novamap = false;
status = efi_exit_boot_services(handle, &priv, exit_boot_func);
if (status != EFI_SUCCESS)
return status;
/* Install the new virtual address map */
efi_rt_call(set_virtual_address_map,
priv.runtime_entry_count * desc_size, desc_size,
desc_ver, priv.runtime_map);
/* Config Direct Mapping */
csr_write64(CSR_DMW0_INIT, LOONGARCH_CSR_DMWIN0);
csr_write64(CSR_DMW1_INIT, LOONGARCH_CSR_DMWIN1);
real_kernel_entry = (void *)kernel_entry_address();
real_kernel_entry(true, (unsigned long)cmdline_ptr,
(unsigned long)efi_system_table);
}
| linux-master | drivers/firmware/efi/libstub/loongarch.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020 Western Digital Corporation or its affiliates.
*/
#include <linux/efi.h>
#include <asm/efi.h>
#include <asm/sections.h>
#include <asm/unaligned.h>
#include "efistub.h"
unsigned long stext_offset(void)
{
/*
* When built as part of the kernel, the EFI stub cannot branch to the
* kernel proper via the image header, as the PE/COFF header is
* strictly not part of the in-memory presentation of the image, only
* of the file representation. So instead, we need to jump to the
* actual entrypoint in the .text region of the image.
*/
return _start_kernel - _start;
}
efi_status_t handle_kernel_image(unsigned long *image_addr,
unsigned long *image_size,
unsigned long *reserve_addr,
unsigned long *reserve_size,
efi_loaded_image_t *image,
efi_handle_t image_handle)
{
unsigned long kernel_size, kernel_codesize, kernel_memsize;
efi_status_t status;
kernel_size = _edata - _start;
kernel_codesize = __init_text_end - _start;
kernel_memsize = kernel_size + (_end - _edata);
*image_addr = (unsigned long)_start;
*image_size = kernel_memsize;
*reserve_size = *image_size;
status = efi_kaslr_relocate_kernel(image_addr,
reserve_addr, reserve_size,
kernel_size, kernel_codesize, kernel_memsize,
efi_kaslr_get_phys_seed(image_handle));
if (status != EFI_SUCCESS) {
efi_err("Failed to relocate kernel\n");
*image_size = 0;
}
return status;
}
void efi_icache_sync(unsigned long start, unsigned long end)
{
asm volatile ("fence.i" ::: "memory");
}
| linux-master | drivers/firmware/efi/libstub/riscv-stub.c |
// SPDX-License-Identifier: GPL-2.0
#include <linux/stdarg.h>
#include <linux/ctype.h>
#include <linux/efi.h>
#include <linux/kernel.h>
#include <linux/printk.h> /* For CONSOLE_LOGLEVEL_* */
#include <asm/efi.h>
#include <asm/setup.h>
#include "efistub.h"
int efi_loglevel = CONSOLE_LOGLEVEL_DEFAULT;
/**
* efi_char16_puts() - Write a UCS-2 encoded string to the console
* @str: UCS-2 encoded string
*/
void efi_char16_puts(efi_char16_t *str)
{
efi_call_proto(efi_table_attr(efi_system_table, con_out),
output_string, str);
}
static
u32 utf8_to_utf32(const u8 **s8)
{
u32 c32;
u8 c0, cx;
size_t clen, i;
c0 = cx = *(*s8)++;
/*
* The position of the most-significant 0 bit gives us the length of
* a multi-octet encoding.
*/
for (clen = 0; cx & 0x80; ++clen)
cx <<= 1;
/*
* If the 0 bit is in position 8, this is a valid single-octet
* encoding. If the 0 bit is in position 7 or positions 1-3, the
* encoding is invalid.
* In either case, we just return the first octet.
*/
if (clen < 2 || clen > 4)
return c0;
/* Get the bits from the first octet. */
c32 = cx >> clen--;
for (i = 0; i < clen; ++i) {
/* Trailing octets must have 10 in most significant bits. */
cx = (*s8)[i] ^ 0x80;
if (cx & 0xc0)
return c0;
c32 = (c32 << 6) | cx;
}
/*
* Check for validity:
* - The character must be in the Unicode range.
* - It must not be a surrogate.
* - It must be encoded using the correct number of octets.
*/
if (c32 > 0x10ffff ||
(c32 & 0xf800) == 0xd800 ||
clen != (c32 >= 0x80) + (c32 >= 0x800) + (c32 >= 0x10000))
return c0;
*s8 += clen;
return c32;
}
/**
* efi_puts() - Write a UTF-8 encoded string to the console
* @str: UTF-8 encoded string
*/
void efi_puts(const char *str)
{
efi_char16_t buf[128];
size_t pos = 0, lim = ARRAY_SIZE(buf);
const u8 *s8 = (const u8 *)str;
u32 c32;
while (*s8) {
if (*s8 == '\n')
buf[pos++] = L'\r';
c32 = utf8_to_utf32(&s8);
if (c32 < 0x10000) {
/* Characters in plane 0 use a single word. */
buf[pos++] = c32;
} else {
/*
* Characters in other planes encode into a surrogate
* pair.
*/
buf[pos++] = (0xd800 - (0x10000 >> 10)) + (c32 >> 10);
buf[pos++] = 0xdc00 + (c32 & 0x3ff);
}
if (*s8 == '\0' || pos >= lim - 2) {
buf[pos] = L'\0';
efi_char16_puts(buf);
pos = 0;
}
}
}
/**
* efi_printk() - Print a kernel message
* @fmt: format string
*
* The first letter of the format string is used to determine the logging level
* of the message. If the level is less then the current EFI logging level, the
* message is suppressed. The message will be truncated to 255 bytes.
*
* Return: number of printed characters
*/
int efi_printk(const char *fmt, ...)
{
char printf_buf[256];
va_list args;
int printed;
int loglevel = printk_get_level(fmt);
switch (loglevel) {
case '0' ... '9':
loglevel -= '0';
break;
default:
/*
* Use loglevel -1 for cases where we just want to print to
* the screen.
*/
loglevel = -1;
break;
}
if (loglevel >= efi_loglevel)
return 0;
if (loglevel >= 0)
efi_puts("EFI stub: ");
fmt = printk_skip_level(fmt);
va_start(args, fmt);
printed = vsnprintf(printf_buf, sizeof(printf_buf), fmt, args);
va_end(args);
efi_puts(printf_buf);
if (printed >= sizeof(printf_buf)) {
efi_puts("[Message truncated]\n");
return -1;
}
return printed;
}
| linux-master | drivers/firmware/efi/libstub/printk.c |
// SPDX-License-Identifier: GPL-2.0-only
// Copyright 2022 Google LLC
// Author: Ard Biesheuvel <[email protected]>
#include <linux/efi.h>
#include "efistub.h"
typedef struct efi_smbios_protocol efi_smbios_protocol_t;
struct efi_smbios_protocol {
efi_status_t (__efiapi *add)(efi_smbios_protocol_t *, efi_handle_t,
u16 *, struct efi_smbios_record *);
efi_status_t (__efiapi *update_string)(efi_smbios_protocol_t *, u16 *,
unsigned long *, u8 *);
efi_status_t (__efiapi *remove)(efi_smbios_protocol_t *, u16);
efi_status_t (__efiapi *get_next)(efi_smbios_protocol_t *, u16 *, u8 *,
struct efi_smbios_record **,
efi_handle_t *);
u8 major_version;
u8 minor_version;
};
const struct efi_smbios_record *efi_get_smbios_record(u8 type)
{
struct efi_smbios_record *record;
efi_smbios_protocol_t *smbios;
efi_status_t status;
u16 handle = 0xfffe;
status = efi_bs_call(locate_protocol, &EFI_SMBIOS_PROTOCOL_GUID, NULL,
(void **)&smbios) ?:
efi_call_proto(smbios, get_next, &handle, &type, &record, NULL);
if (status != EFI_SUCCESS)
return NULL;
return record;
}
const u8 *__efi_get_smbios_string(const struct efi_smbios_record *record,
u8 type, int offset)
{
const u8 *strtable;
if (!record)
return NULL;
strtable = (u8 *)record + record->length;
for (int i = 1; i < ((u8 *)record)[offset]; i++) {
int len = strlen(strtable);
if (!len)
return NULL;
strtable += len + 1;
}
return strtable;
}
| linux-master | drivers/firmware/efi/libstub/smbios.c |
// SPDX-License-Identifier: GPL-2.0-only
/* -*- linux-c -*- ------------------------------------------------------- *
*
* Copyright (C) 1991, 1992 Linus Torvalds
* Copyright 2007 rPath, Inc. - All Rights Reserved
*
* ----------------------------------------------------------------------- */
/*
* Oh, it's a waste of space, but oh-so-yummy for debugging.
*/
#include <linux/stdarg.h>
#include <linux/compiler.h>
#include <linux/ctype.h>
#include <linux/kernel.h>
#include <linux/limits.h>
#include <linux/string.h>
#include <linux/types.h>
static
int skip_atoi(const char **s)
{
int i = 0;
while (isdigit(**s))
i = i * 10 + *((*s)++) - '0';
return i;
}
/*
* put_dec_full4 handles numbers in the range 0 <= r < 10000.
* The multiplier 0xccd is round(2^15/10), and the approximation
* r/10 == (r * 0xccd) >> 15 is exact for all r < 16389.
*/
static
void put_dec_full4(char *end, unsigned int r)
{
int i;
for (i = 0; i < 3; i++) {
unsigned int q = (r * 0xccd) >> 15;
*--end = '0' + (r - q * 10);
r = q;
}
*--end = '0' + r;
}
/* put_dec is copied from lib/vsprintf.c with small modifications */
/*
* Call put_dec_full4 on x % 10000, return x / 10000.
* The approximation x/10000 == (x * 0x346DC5D7) >> 43
* holds for all x < 1,128,869,999. The largest value this
* helper will ever be asked to convert is 1,125,520,955.
* (second call in the put_dec code, assuming n is all-ones).
*/
static
unsigned int put_dec_helper4(char *end, unsigned int x)
{
unsigned int q = (x * 0x346DC5D7ULL) >> 43;
put_dec_full4(end, x - q * 10000);
return q;
}
/* Based on code by Douglas W. Jones found at
* <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
* (with permission from the author).
* Performs no 64-bit division and hence should be fast on 32-bit machines.
*/
static
char *put_dec(char *end, unsigned long long n)
{
unsigned int d3, d2, d1, q, h;
char *p = end;
d1 = ((unsigned int)n >> 16); /* implicit "& 0xffff" */
h = (n >> 32);
d2 = (h ) & 0xffff;
d3 = (h >> 16); /* implicit "& 0xffff" */
/* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
= 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */
q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((unsigned int)n & 0xffff);
q = put_dec_helper4(p, q);
p -= 4;
q += 7671 * d3 + 9496 * d2 + 6 * d1;
q = put_dec_helper4(p, q);
p -= 4;
q += 4749 * d3 + 42 * d2;
q = put_dec_helper4(p, q);
p -= 4;
q += 281 * d3;
q = put_dec_helper4(p, q);
p -= 4;
put_dec_full4(p, q);
p -= 4;
/* strip off the extra 0's we printed */
while (p < end && *p == '0')
++p;
return p;
}
static
char *number(char *end, unsigned long long num, int base, char locase)
{
/*
* locase = 0 or 0x20. ORing digits or letters with 'locase'
* produces same digits or (maybe lowercased) letters
*/
/* we are called with base 8, 10 or 16, only, thus don't need "G..." */
static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
switch (base) {
case 10:
if (num != 0)
end = put_dec(end, num);
break;
case 8:
for (; num != 0; num >>= 3)
*--end = '0' + (num & 07);
break;
case 16:
for (; num != 0; num >>= 4)
*--end = digits[num & 0xf] | locase;
break;
default:
unreachable();
}
return end;
}
#define ZEROPAD 1 /* pad with zero */
#define SIGN 2 /* unsigned/signed long */
#define PLUS 4 /* show plus */
#define SPACE 8 /* space if plus */
#define LEFT 16 /* left justified */
#define SMALL 32 /* Must be 32 == 0x20 */
#define SPECIAL 64 /* 0x */
#define WIDE 128 /* UTF-16 string */
static
int get_flags(const char **fmt)
{
int flags = 0;
do {
switch (**fmt) {
case '-':
flags |= LEFT;
break;
case '+':
flags |= PLUS;
break;
case ' ':
flags |= SPACE;
break;
case '#':
flags |= SPECIAL;
break;
case '0':
flags |= ZEROPAD;
break;
default:
return flags;
}
++(*fmt);
} while (1);
}
static
int get_int(const char **fmt, va_list *ap)
{
if (isdigit(**fmt))
return skip_atoi(fmt);
if (**fmt == '*') {
++(*fmt);
/* it's the next argument */
return va_arg(*ap, int);
}
return 0;
}
static
unsigned long long get_number(int sign, int qualifier, va_list *ap)
{
if (sign) {
switch (qualifier) {
case 'L':
return va_arg(*ap, long long);
case 'l':
return va_arg(*ap, long);
case 'h':
return (short)va_arg(*ap, int);
case 'H':
return (signed char)va_arg(*ap, int);
default:
return va_arg(*ap, int);
};
} else {
switch (qualifier) {
case 'L':
return va_arg(*ap, unsigned long long);
case 'l':
return va_arg(*ap, unsigned long);
case 'h':
return (unsigned short)va_arg(*ap, int);
case 'H':
return (unsigned char)va_arg(*ap, int);
default:
return va_arg(*ap, unsigned int);
}
}
}
static
char get_sign(long long *num, int flags)
{
if (!(flags & SIGN))
return 0;
if (*num < 0) {
*num = -(*num);
return '-';
}
if (flags & PLUS)
return '+';
if (flags & SPACE)
return ' ';
return 0;
}
static
size_t utf16s_utf8nlen(const u16 *s16, size_t maxlen)
{
size_t len, clen;
for (len = 0; len < maxlen && *s16; len += clen) {
u16 c0 = *s16++;
/* First, get the length for a BMP character */
clen = 1 + (c0 >= 0x80) + (c0 >= 0x800);
if (len + clen > maxlen)
break;
/*
* If this is a high surrogate, and we're already at maxlen, we
* can't include the character if it's a valid surrogate pair.
* Avoid accessing one extra word just to check if it's valid
* or not.
*/
if ((c0 & 0xfc00) == 0xd800) {
if (len + clen == maxlen)
break;
if ((*s16 & 0xfc00) == 0xdc00) {
++s16;
++clen;
}
}
}
return len;
}
static
u32 utf16_to_utf32(const u16 **s16)
{
u16 c0, c1;
c0 = *(*s16)++;
/* not a surrogate */
if ((c0 & 0xf800) != 0xd800)
return c0;
/* invalid: low surrogate instead of high */
if (c0 & 0x0400)
return 0xfffd;
c1 = **s16;
/* invalid: missing low surrogate */
if ((c1 & 0xfc00) != 0xdc00)
return 0xfffd;
/* valid surrogate pair */
++(*s16);
return (0x10000 - (0xd800 << 10) - 0xdc00) + (c0 << 10) + c1;
}
#define PUTC(c) \
do { \
if (pos < size) \
buf[pos] = (c); \
++pos; \
} while (0);
int vsnprintf(char *buf, size_t size, const char *fmt, va_list ap)
{
/* The maximum space required is to print a 64-bit number in octal */
char tmp[(sizeof(unsigned long long) * 8 + 2) / 3];
char *tmp_end = &tmp[ARRAY_SIZE(tmp)];
long long num;
int base;
const char *s;
size_t len, pos;
char sign;
int flags; /* flags to number() */
int field_width; /* width of output field */
int precision; /* min. # of digits for integers; max
number of chars for from string */
int qualifier; /* 'h', 'hh', 'l' or 'll' for integer fields */
va_list args;
/*
* We want to pass our input va_list to helper functions by reference,
* but there's an annoying edge case. If va_list was originally passed
* to us by value, we could just pass &ap down to the helpers. This is
* the case on, for example, X86_32.
* However, on X86_64 (and possibly others), va_list is actually a
* size-1 array containing a structure. Our function parameter ap has
* decayed from T[1] to T*, and &ap has type T** rather than T(*)[1],
* which is what will be expected by a function taking a va_list *
* parameter.
* One standard way to solve this mess is by creating a copy in a local
* variable of type va_list and then passing a pointer to that local
* copy instead, which is what we do here.
*/
va_copy(args, ap);
for (pos = 0; *fmt; ++fmt) {
if (*fmt != '%' || *++fmt == '%') {
PUTC(*fmt);
continue;
}
/* process flags */
flags = get_flags(&fmt);
/* get field width */
field_width = get_int(&fmt, &args);
if (field_width < 0) {
field_width = -field_width;
flags |= LEFT;
}
if (flags & LEFT)
flags &= ~ZEROPAD;
/* get the precision */
precision = -1;
if (*fmt == '.') {
++fmt;
precision = get_int(&fmt, &args);
if (precision >= 0)
flags &= ~ZEROPAD;
}
/* get the conversion qualifier */
qualifier = -1;
if (*fmt == 'h' || *fmt == 'l') {
qualifier = *fmt;
++fmt;
if (qualifier == *fmt) {
qualifier -= 'a'-'A';
++fmt;
}
}
sign = 0;
switch (*fmt) {
case 'c':
flags &= LEFT;
s = tmp;
if (qualifier == 'l') {
((u16 *)tmp)[0] = (u16)va_arg(args, unsigned int);
((u16 *)tmp)[1] = L'\0';
precision = INT_MAX;
goto wstring;
} else {
tmp[0] = (unsigned char)va_arg(args, int);
precision = len = 1;
}
goto output;
case 's':
flags &= LEFT;
if (precision < 0)
precision = INT_MAX;
s = va_arg(args, void *);
if (!s)
s = precision < 6 ? "" : "(null)";
else if (qualifier == 'l') {
wstring:
flags |= WIDE;
precision = len = utf16s_utf8nlen((const u16 *)s, precision);
goto output;
}
precision = len = strnlen(s, precision);
goto output;
/* integer number formats - set up the flags and "break" */
case 'o':
base = 8;
break;
case 'p':
if (precision < 0)
precision = 2 * sizeof(void *);
fallthrough;
case 'x':
flags |= SMALL;
fallthrough;
case 'X':
base = 16;
break;
case 'd':
case 'i':
flags |= SIGN;
fallthrough;
case 'u':
flags &= ~SPECIAL;
base = 10;
break;
default:
/*
* Bail out if the conversion specifier is invalid.
* There's probably a typo in the format string and the
* remaining specifiers are unlikely to match up with
* the arguments.
*/
goto fail;
}
if (*fmt == 'p') {
num = (unsigned long)va_arg(args, void *);
} else {
num = get_number(flags & SIGN, qualifier, &args);
}
sign = get_sign(&num, flags);
if (sign)
--field_width;
s = number(tmp_end, num, base, flags & SMALL);
len = tmp_end - s;
/* default precision is 1 */
if (precision < 0)
precision = 1;
/* precision is minimum number of digits to print */
if (precision < len)
precision = len;
if (flags & SPECIAL) {
/*
* For octal, a leading 0 is printed only if necessary,
* i.e. if it's not already there because of the
* precision.
*/
if (base == 8 && precision == len)
++precision;
/*
* For hexadecimal, the leading 0x is skipped if the
* output is empty, i.e. both the number and the
* precision are 0.
*/
if (base == 16 && precision > 0)
field_width -= 2;
else
flags &= ~SPECIAL;
}
/*
* For zero padding, increase the precision to fill the field
* width.
*/
if ((flags & ZEROPAD) && field_width > precision)
precision = field_width;
output:
/* Calculate the padding necessary */
field_width -= precision;
/* Leading padding with ' ' */
if (!(flags & LEFT))
while (field_width-- > 0)
PUTC(' ');
/* sign */
if (sign)
PUTC(sign);
/* 0x/0X for hexadecimal */
if (flags & SPECIAL) {
PUTC('0');
PUTC( 'X' | (flags & SMALL));
}
/* Zero padding and excess precision */
while (precision-- > len)
PUTC('0');
/* Actual output */
if (flags & WIDE) {
const u16 *ws = (const u16 *)s;
while (len-- > 0) {
u32 c32 = utf16_to_utf32(&ws);
u8 *s8;
size_t clen;
if (c32 < 0x80) {
PUTC(c32);
continue;
}
/* Number of trailing octets */
clen = 1 + (c32 >= 0x800) + (c32 >= 0x10000);
len -= clen;
s8 = (u8 *)&buf[pos];
/* Avoid writing partial character */
PUTC('\0');
pos += clen;
if (pos >= size)
continue;
/* Set high bits of leading octet */
*s8 = (0xf00 >> 1) >> clen;
/* Write trailing octets in reverse order */
for (s8 += clen; clen; --clen, c32 >>= 6)
*s8-- = 0x80 | (c32 & 0x3f);
/* Set low bits of leading octet */
*s8 |= c32;
}
} else {
while (len-- > 0)
PUTC(*s++);
}
/* Trailing padding with ' ' */
while (field_width-- > 0)
PUTC(' ');
}
fail:
va_end(args);
if (size)
buf[min(pos, size-1)] = '\0';
return pos;
}
int snprintf(char *buf, size_t size, const char *fmt, ...)
{
va_list args;
int i;
va_start(args, fmt);
i = vsnprintf(buf, size, fmt, args);
va_end(args);
return i;
}
| linux-master | drivers/firmware/efi/libstub/vsprintf.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Taken from:
* linux/lib/string.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#include <linux/ctype.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#ifndef EFI_HAVE_STRLEN
/**
* strlen - Find the length of a string
* @s: The string to be sized
*/
size_t strlen(const char *s)
{
const char *sc;
for (sc = s; *sc != '\0'; ++sc)
/* nothing */;
return sc - s;
}
#endif
#ifndef EFI_HAVE_STRNLEN
/**
* strnlen - Find the length of a length-limited string
* @s: The string to be sized
* @count: The maximum number of bytes to search
*/
size_t strnlen(const char *s, size_t count)
{
const char *sc;
for (sc = s; count-- && *sc != '\0'; ++sc)
/* nothing */;
return sc - s;
}
#endif
/**
* strstr - Find the first substring in a %NUL terminated string
* @s1: The string to be searched
* @s2: The string to search for
*/
char *strstr(const char *s1, const char *s2)
{
size_t l1, l2;
l2 = strlen(s2);
if (!l2)
return (char *)s1;
l1 = strlen(s1);
while (l1 >= l2) {
l1--;
if (!memcmp(s1, s2, l2))
return (char *)s1;
s1++;
}
return NULL;
}
#ifndef EFI_HAVE_STRCMP
/**
* strcmp - Compare two strings
* @cs: One string
* @ct: Another string
*/
int strcmp(const char *cs, const char *ct)
{
unsigned char c1, c2;
while (1) {
c1 = *cs++;
c2 = *ct++;
if (c1 != c2)
return c1 < c2 ? -1 : 1;
if (!c1)
break;
}
return 0;
}
#endif
/**
* strncmp - Compare two length-limited strings
* @cs: One string
* @ct: Another string
* @count: The maximum number of bytes to compare
*/
int strncmp(const char *cs, const char *ct, size_t count)
{
unsigned char c1, c2;
while (count) {
c1 = *cs++;
c2 = *ct++;
if (c1 != c2)
return c1 < c2 ? -1 : 1;
if (!c1)
break;
count--;
}
return 0;
}
/* Works only for digits and letters, but small and fast */
#define TOLOWER(x) ((x) | 0x20)
static unsigned int simple_guess_base(const char *cp)
{
if (cp[0] == '0') {
if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
return 16;
else
return 8;
} else {
return 10;
}
}
/**
* simple_strtoull - convert a string to an unsigned long long
* @cp: The start of the string
* @endp: A pointer to the end of the parsed string will be placed here
* @base: The number base to use
*/
unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
{
unsigned long long result = 0;
if (!base)
base = simple_guess_base(cp);
if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
cp += 2;
while (isxdigit(*cp)) {
unsigned int value;
value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
if (value >= base)
break;
result = result * base + value;
cp++;
}
if (endp)
*endp = (char *)cp;
return result;
}
long simple_strtol(const char *cp, char **endp, unsigned int base)
{
if (*cp == '-')
return -simple_strtoull(cp + 1, endp, base);
return simple_strtoull(cp, endp, base);
}
#ifdef CONFIG_EFI_PARAMS_FROM_FDT
#ifndef EFI_HAVE_STRRCHR
/**
* strrchr - Find the last occurrence of a character in a string
* @s: The string to be searched
* @c: The character to search for
*/
char *strrchr(const char *s, int c)
{
const char *last = NULL;
do {
if (*s == (char)c)
last = s;
} while (*s++);
return (char *)last;
}
#endif
#ifndef EFI_HAVE_MEMCHR
/**
* memchr - Find a character in an area of memory.
* @s: The memory area
* @c: The byte to search for
* @n: The size of the area.
*
* returns the address of the first occurrence of @c, or %NULL
* if @c is not found
*/
void *memchr(const void *s, int c, size_t n)
{
const unsigned char *p = s;
while (n-- != 0) {
if ((unsigned char)c == *p++) {
return (void *)(p - 1);
}
}
return NULL;
}
#endif
#endif
| linux-master | drivers/firmware/efi/libstub/string.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2016 Linaro Ltd; <[email protected]>
*/
#include <linux/efi.h>
#include <asm/efi.h>
#include "efistub.h"
typedef union efi_rng_protocol efi_rng_protocol_t;
union efi_rng_protocol {
struct {
efi_status_t (__efiapi *get_info)(efi_rng_protocol_t *,
unsigned long *,
efi_guid_t *);
efi_status_t (__efiapi *get_rng)(efi_rng_protocol_t *,
efi_guid_t *, unsigned long,
u8 *out);
};
struct {
u32 get_info;
u32 get_rng;
} mixed_mode;
};
/**
* efi_get_random_bytes() - fill a buffer with random bytes
* @size: size of the buffer
* @out: caller allocated buffer to receive the random bytes
*
* The call will fail if either the firmware does not implement the
* EFI_RNG_PROTOCOL or there are not enough random bytes available to fill
* the buffer.
*
* Return: status code
*/
efi_status_t efi_get_random_bytes(unsigned long size, u8 *out)
{
efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID;
efi_status_t status;
efi_rng_protocol_t *rng = NULL;
status = efi_bs_call(locate_protocol, &rng_proto, NULL, (void **)&rng);
if (status != EFI_SUCCESS)
return status;
return efi_call_proto(rng, get_rng, NULL, size, out);
}
/**
* efi_random_get_seed() - provide random seed as configuration table
*
* The EFI_RNG_PROTOCOL is used to read random bytes. These random bytes are
* saved as a configuration table which can be used as entropy by the kernel
* for the initialization of its pseudo random number generator.
*
* If the EFI_RNG_PROTOCOL is not available or there are not enough random bytes
* available, the configuration table will not be installed and an error code
* will be returned.
*
* Return: status code
*/
efi_status_t efi_random_get_seed(void)
{
efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID;
efi_guid_t rng_algo_raw = EFI_RNG_ALGORITHM_RAW;
efi_guid_t rng_table_guid = LINUX_EFI_RANDOM_SEED_TABLE_GUID;
struct linux_efi_random_seed *prev_seed, *seed = NULL;
int prev_seed_size = 0, seed_size = EFI_RANDOM_SEED_SIZE;
unsigned long nv_seed_size = 0, offset = 0;
efi_rng_protocol_t *rng = NULL;
efi_status_t status;
status = efi_bs_call(locate_protocol, &rng_proto, NULL, (void **)&rng);
if (status != EFI_SUCCESS)
seed_size = 0;
// Call GetVariable() with a zero length buffer to obtain the size
get_efi_var(L"RandomSeed", &rng_table_guid, NULL, &nv_seed_size, NULL);
if (!seed_size && !nv_seed_size)
return status;
seed_size += nv_seed_size;
/*
* Check whether a seed was provided by a prior boot stage. In that
* case, instead of overwriting it, let's create a new buffer that can
* hold both, and concatenate the existing and the new seeds.
* Note that we should read the seed size with caution, in case the
* table got corrupted in memory somehow.
*/
prev_seed = get_efi_config_table(rng_table_guid);
if (prev_seed && prev_seed->size <= 512U) {
prev_seed_size = prev_seed->size;
seed_size += prev_seed_size;
}
/*
* Use EFI_ACPI_RECLAIM_MEMORY here so that it is guaranteed that the
* allocation will survive a kexec reboot (although we refresh the seed
* beforehand)
*/
status = efi_bs_call(allocate_pool, EFI_ACPI_RECLAIM_MEMORY,
struct_size(seed, bits, seed_size),
(void **)&seed);
if (status != EFI_SUCCESS) {
efi_warn("Failed to allocate memory for RNG seed.\n");
goto err_warn;
}
if (rng) {
status = efi_call_proto(rng, get_rng, &rng_algo_raw,
EFI_RANDOM_SEED_SIZE, seed->bits);
if (status == EFI_UNSUPPORTED)
/*
* Use whatever algorithm we have available if the raw algorithm
* is not implemented.
*/
status = efi_call_proto(rng, get_rng, NULL,
EFI_RANDOM_SEED_SIZE, seed->bits);
if (status == EFI_SUCCESS)
offset = EFI_RANDOM_SEED_SIZE;
}
if (nv_seed_size) {
status = get_efi_var(L"RandomSeed", &rng_table_guid, NULL,
&nv_seed_size, seed->bits + offset);
if (status == EFI_SUCCESS)
/*
* We delete the seed here, and /hope/ that this causes
* EFI to also zero out its representation on disk.
* This is somewhat idealistic, but overwriting the
* variable with zeros is likely just as fraught too.
* TODO: in the future, maybe we can hash it forward
* instead, and write a new seed.
*/
status = set_efi_var(L"RandomSeed", &rng_table_guid, 0,
0, NULL);
if (status == EFI_SUCCESS)
offset += nv_seed_size;
else
memzero_explicit(seed->bits + offset, nv_seed_size);
}
if (!offset)
goto err_freepool;
if (prev_seed_size) {
memcpy(seed->bits + offset, prev_seed->bits, prev_seed_size);
offset += prev_seed_size;
}
seed->size = offset;
status = efi_bs_call(install_configuration_table, &rng_table_guid, seed);
if (status != EFI_SUCCESS)
goto err_freepool;
if (prev_seed_size) {
/* wipe and free the old seed if we managed to install the new one */
memzero_explicit(prev_seed->bits, prev_seed_size);
efi_bs_call(free_pool, prev_seed);
}
return EFI_SUCCESS;
err_freepool:
memzero_explicit(seed, struct_size(seed, bits, seed_size));
efi_bs_call(free_pool, seed);
efi_warn("Failed to obtain seed from EFI_RNG_PROTOCOL or EFI variable\n");
err_warn:
if (prev_seed)
efi_warn("Retaining bootloader-supplied seed only");
return status;
}
| linux-master | drivers/firmware/efi/libstub/random.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Author: Yun Liu <[email protected]>
* Huacai Chen <[email protected]>
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <asm/efi.h>
#include <asm/addrspace.h>
#include "efistub.h"
extern int kernel_asize;
extern int kernel_fsize;
extern int kernel_offset;
extern int kernel_entry;
efi_status_t handle_kernel_image(unsigned long *image_addr,
unsigned long *image_size,
unsigned long *reserve_addr,
unsigned long *reserve_size,
efi_loaded_image_t *image,
efi_handle_t image_handle)
{
efi_status_t status;
unsigned long kernel_addr = 0;
kernel_addr = (unsigned long)&kernel_offset - kernel_offset;
status = efi_relocate_kernel(&kernel_addr, kernel_fsize, kernel_asize,
EFI_KIMG_PREFERRED_ADDRESS, efi_get_kimg_min_align(), 0x0);
*image_addr = kernel_addr;
*image_size = kernel_asize;
return status;
}
unsigned long kernel_entry_address(void)
{
unsigned long base = (unsigned long)&kernel_offset - kernel_offset;
return (unsigned long)&kernel_entry - base + VMLINUX_LOAD_ADDRESS;
}
| linux-master | drivers/firmware/efi/libstub/loongarch-stub.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* EFI stub implementation that is shared by arm and arm64 architectures.
* This should be #included by the EFI stub implementation files.
*
* Copyright (C) 2013,2014 Linaro Limited
* Roy Franz <[email protected]
* Copyright (C) 2013 Red Hat, Inc.
* Mark Salter <[email protected]>
*/
#include <linux/efi.h>
#include <asm/efi.h>
#include "efistub.h"
/*
* This is the base address at which to start allocating virtual memory ranges
* for UEFI Runtime Services.
*
* For ARM/ARM64:
* This is in the low TTBR0 range so that we can use
* any allocation we choose, and eliminate the risk of a conflict after kexec.
* The value chosen is the largest non-zero power of 2 suitable for this purpose
* both on 32-bit and 64-bit ARM CPUs, to maximize the likelihood that it can
* be mapped efficiently.
* Since 32-bit ARM could potentially execute with a 1G/3G user/kernel split,
* map everything below 1 GB. (512 MB is a reasonable upper bound for the
* entire footprint of the UEFI runtime services memory regions)
*
* For RISC-V:
* There is no specific reason for which, this address (512MB) can't be used
* EFI runtime virtual address for RISC-V. It also helps to use EFI runtime
* services on both RV32/RV64. Keep the same runtime virtual address for RISC-V
* as well to minimize the code churn.
*/
#define EFI_RT_VIRTUAL_BASE SZ_512M
/*
* Some architectures map the EFI regions into the kernel's linear map using a
* fixed offset.
*/
#ifndef EFI_RT_VIRTUAL_OFFSET
#define EFI_RT_VIRTUAL_OFFSET 0
#endif
static u64 virtmap_base = EFI_RT_VIRTUAL_BASE;
static bool flat_va_mapping = (EFI_RT_VIRTUAL_OFFSET != 0);
void __weak free_screen_info(struct screen_info *si)
{
}
static struct screen_info *setup_graphics(void)
{
efi_guid_t gop_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
efi_status_t status;
unsigned long size;
void **gop_handle = NULL;
struct screen_info *si = NULL;
size = 0;
status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
&gop_proto, NULL, &size, gop_handle);
if (status == EFI_BUFFER_TOO_SMALL) {
si = alloc_screen_info();
if (!si)
return NULL;
status = efi_setup_gop(si, &gop_proto, size);
if (status != EFI_SUCCESS) {
free_screen_info(si);
return NULL;
}
}
return si;
}
static void install_memreserve_table(void)
{
struct linux_efi_memreserve *rsv;
efi_guid_t memreserve_table_guid = LINUX_EFI_MEMRESERVE_TABLE_GUID;
efi_status_t status;
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, sizeof(*rsv),
(void **)&rsv);
if (status != EFI_SUCCESS) {
efi_err("Failed to allocate memreserve entry!\n");
return;
}
rsv->next = 0;
rsv->size = 0;
atomic_set(&rsv->count, 0);
status = efi_bs_call(install_configuration_table,
&memreserve_table_guid, rsv);
if (status != EFI_SUCCESS)
efi_err("Failed to install memreserve config table!\n");
}
static u32 get_supported_rt_services(void)
{
const efi_rt_properties_table_t *rt_prop_table;
u32 supported = EFI_RT_SUPPORTED_ALL;
rt_prop_table = get_efi_config_table(EFI_RT_PROPERTIES_TABLE_GUID);
if (rt_prop_table)
supported &= rt_prop_table->runtime_services_supported;
return supported;
}
efi_status_t efi_handle_cmdline(efi_loaded_image_t *image, char **cmdline_ptr)
{
int cmdline_size = 0;
efi_status_t status;
char *cmdline;
/*
* Get the command line from EFI, using the LOADED_IMAGE
* protocol. We are going to copy the command line into the
* device tree, so this can be allocated anywhere.
*/
cmdline = efi_convert_cmdline(image, &cmdline_size);
if (!cmdline) {
efi_err("getting command line via LOADED_IMAGE_PROTOCOL\n");
return EFI_OUT_OF_RESOURCES;
}
if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) ||
IS_ENABLED(CONFIG_CMDLINE_FORCE) ||
cmdline_size == 0) {
status = efi_parse_options(CONFIG_CMDLINE);
if (status != EFI_SUCCESS) {
efi_err("Failed to parse options\n");
goto fail_free_cmdline;
}
}
if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && cmdline_size > 0) {
status = efi_parse_options(cmdline);
if (status != EFI_SUCCESS) {
efi_err("Failed to parse options\n");
goto fail_free_cmdline;
}
}
*cmdline_ptr = cmdline;
return EFI_SUCCESS;
fail_free_cmdline:
efi_bs_call(free_pool, cmdline_ptr);
return status;
}
efi_status_t efi_stub_common(efi_handle_t handle,
efi_loaded_image_t *image,
unsigned long image_addr,
char *cmdline_ptr)
{
struct screen_info *si;
efi_status_t status;
status = check_platform_features();
if (status != EFI_SUCCESS)
return status;
si = setup_graphics();
efi_retrieve_tpm2_eventlog();
/* Ask the firmware to clear memory on unclean shutdown */
efi_enable_reset_attack_mitigation();
efi_load_initrd(image, ULONG_MAX, efi_get_max_initrd_addr(image_addr),
NULL);
efi_random_get_seed();
/* force efi_novamap if SetVirtualAddressMap() is unsupported */
efi_novamap |= !(get_supported_rt_services() &
EFI_RT_SUPPORTED_SET_VIRTUAL_ADDRESS_MAP);
install_memreserve_table();
status = efi_boot_kernel(handle, image, image_addr, cmdline_ptr);
free_screen_info(si);
return status;
}
/*
* efi_allocate_virtmap() - create a pool allocation for the virtmap
*
* Create an allocation that is of sufficient size to hold all the memory
* descriptors that will be passed to SetVirtualAddressMap() to inform the
* firmware about the virtual mapping that will be used under the OS to call
* into the firmware.
*/
efi_status_t efi_alloc_virtmap(efi_memory_desc_t **virtmap,
unsigned long *desc_size, u32 *desc_ver)
{
unsigned long size, mmap_key;
efi_status_t status;
/*
* Use the size of the current memory map as an upper bound for the
* size of the buffer we need to pass to SetVirtualAddressMap() to
* cover all EFI_MEMORY_RUNTIME regions.
*/
size = 0;
status = efi_bs_call(get_memory_map, &size, NULL, &mmap_key, desc_size,
desc_ver);
if (status != EFI_BUFFER_TOO_SMALL)
return EFI_LOAD_ERROR;
return efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
(void **)virtmap);
}
/*
* efi_get_virtmap() - create a virtual mapping for the EFI memory map
*
* This function populates the virt_addr fields of all memory region descriptors
* in @memory_map whose EFI_MEMORY_RUNTIME attribute is set. Those descriptors
* are also copied to @runtime_map, and their total count is returned in @count.
*/
void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size,
unsigned long desc_size, efi_memory_desc_t *runtime_map,
int *count)
{
u64 efi_virt_base = virtmap_base;
efi_memory_desc_t *in, *out = runtime_map;
int l;
*count = 0;
for (l = 0; l < map_size; l += desc_size) {
u64 paddr, size;
in = (void *)memory_map + l;
if (!(in->attribute & EFI_MEMORY_RUNTIME))
continue;
paddr = in->phys_addr;
size = in->num_pages * EFI_PAGE_SIZE;
in->virt_addr = in->phys_addr + EFI_RT_VIRTUAL_OFFSET;
if (efi_novamap) {
continue;
}
/*
* Make the mapping compatible with 64k pages: this allows
* a 4k page size kernel to kexec a 64k page size kernel and
* vice versa.
*/
if (!flat_va_mapping) {
paddr = round_down(in->phys_addr, SZ_64K);
size += in->phys_addr - paddr;
/*
* Avoid wasting memory on PTEs by choosing a virtual
* base that is compatible with section mappings if this
* region has the appropriate size and physical
* alignment. (Sections are 2 MB on 4k granule kernels)
*/
if (IS_ALIGNED(in->phys_addr, SZ_2M) && size >= SZ_2M)
efi_virt_base = round_up(efi_virt_base, SZ_2M);
else
efi_virt_base = round_up(efi_virt_base, SZ_64K);
in->virt_addr += efi_virt_base - paddr;
efi_virt_base += size;
}
memcpy(out, in, desc_size);
out = (void *)out + desc_size;
++*count;
}
}
| linux-master | drivers/firmware/efi/libstub/efi-stub.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2013 Linaro Ltd; <[email protected]>
*/
#include <linux/efi.h>
#include <asm/efi.h>
#include "efistub.h"
static efi_guid_t cpu_state_guid = LINUX_EFI_ARM_CPU_STATE_TABLE_GUID;
struct efi_arm_entry_state *efi_entry_state;
static void get_cpu_state(u32 *cpsr, u32 *sctlr)
{
asm("mrs %0, cpsr" : "=r"(*cpsr));
if ((*cpsr & MODE_MASK) == HYP_MODE)
asm("mrc p15, 4, %0, c1, c0, 0" : "=r"(*sctlr));
else
asm("mrc p15, 0, %0, c1, c0, 0" : "=r"(*sctlr));
}
efi_status_t check_platform_features(void)
{
efi_status_t status;
u32 cpsr, sctlr;
int block;
get_cpu_state(&cpsr, &sctlr);
efi_info("Entering in %s mode with MMU %sabled\n",
((cpsr & MODE_MASK) == HYP_MODE) ? "HYP" : "SVC",
(sctlr & 1) ? "en" : "dis");
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA,
sizeof(*efi_entry_state),
(void **)&efi_entry_state);
if (status != EFI_SUCCESS) {
efi_err("allocate_pool() failed\n");
return status;
}
efi_entry_state->cpsr_before_ebs = cpsr;
efi_entry_state->sctlr_before_ebs = sctlr;
status = efi_bs_call(install_configuration_table, &cpu_state_guid,
efi_entry_state);
if (status != EFI_SUCCESS) {
efi_err("install_configuration_table() failed\n");
goto free_state;
}
/* non-LPAE kernels can run anywhere */
if (!IS_ENABLED(CONFIG_ARM_LPAE))
return EFI_SUCCESS;
/* LPAE kernels need compatible hardware */
block = cpuid_feature_extract(CPUID_EXT_MMFR0, 0);
if (block < 5) {
efi_err("This LPAE kernel is not supported by your CPU\n");
status = EFI_UNSUPPORTED;
goto drop_table;
}
return EFI_SUCCESS;
drop_table:
efi_bs_call(install_configuration_table, &cpu_state_guid, NULL);
free_state:
efi_bs_call(free_pool, efi_entry_state);
return status;
}
void efi_handle_post_ebs_state(void)
{
get_cpu_state(&efi_entry_state->cpsr_after_ebs,
&efi_entry_state->sctlr_after_ebs);
}
efi_status_t handle_kernel_image(unsigned long *image_addr,
unsigned long *image_size,
unsigned long *reserve_addr,
unsigned long *reserve_size,
efi_loaded_image_t *image,
efi_handle_t image_handle)
{
const int slack = TEXT_OFFSET - 5 * PAGE_SIZE;
int alloc_size = MAX_UNCOMP_KERNEL_SIZE + EFI_PHYS_ALIGN;
unsigned long alloc_base, kernel_base;
efi_status_t status;
/*
* Allocate space for the decompressed kernel as low as possible.
* The region should be 16 MiB aligned, but the first 'slack' bytes
* are not used by Linux, so we allow those to be occupied by the
* firmware.
*/
status = efi_low_alloc_above(alloc_size, EFI_PAGE_SIZE, &alloc_base, 0x0);
if (status != EFI_SUCCESS) {
efi_err("Unable to allocate memory for uncompressed kernel.\n");
return status;
}
if ((alloc_base % EFI_PHYS_ALIGN) > slack) {
/*
* More than 'slack' bytes are already occupied at the base of
* the allocation, so we need to advance to the next 16 MiB block.
*/
kernel_base = round_up(alloc_base, EFI_PHYS_ALIGN);
efi_info("Free memory starts at 0x%lx, setting kernel_base to 0x%lx\n",
alloc_base, kernel_base);
} else {
kernel_base = round_down(alloc_base, EFI_PHYS_ALIGN);
}
*reserve_addr = kernel_base + slack;
*reserve_size = MAX_UNCOMP_KERNEL_SIZE;
/* now free the parts that we will not use */
if (*reserve_addr > alloc_base) {
efi_bs_call(free_pages, alloc_base,
(*reserve_addr - alloc_base) / EFI_PAGE_SIZE);
alloc_size -= *reserve_addr - alloc_base;
}
efi_bs_call(free_pages, *reserve_addr + MAX_UNCOMP_KERNEL_SIZE,
(alloc_size - MAX_UNCOMP_KERNEL_SIZE) / EFI_PAGE_SIZE);
*image_addr = kernel_base + TEXT_OFFSET;
*image_size = 0;
efi_debug("image addr == 0x%lx, reserve_addr == 0x%lx\n",
*image_addr, *reserve_addr);
return EFI_SUCCESS;
}
| linux-master | drivers/firmware/efi/libstub/arm32-stub.c |
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/efi.h>
#include <asm/boot.h>
#include <asm/desc.h>
#include <asm/efi.h>
#include "efistub.h"
#include "x86-stub.h"
bool efi_no5lvl;
static void (*la57_toggle)(void *cr3);
static const struct desc_struct gdt[] = {
[GDT_ENTRY_KERNEL32_CS] = GDT_ENTRY_INIT(0xc09b, 0, 0xfffff),
[GDT_ENTRY_KERNEL_CS] = GDT_ENTRY_INIT(0xa09b, 0, 0xfffff),
};
/*
* Enabling (or disabling) 5 level paging is tricky, because it can only be
* done from 32-bit mode with paging disabled. This means not only that the
* code itself must be running from 32-bit addressable physical memory, but
* also that the root page table must be 32-bit addressable, as programming
* a 64-bit value into CR3 when running in 32-bit mode is not supported.
*/
efi_status_t efi_setup_5level_paging(void)
{
u8 tmpl_size = (u8 *)&trampoline_ljmp_imm_offset - (u8 *)&trampoline_32bit_src;
efi_status_t status;
u8 *la57_code;
if (!efi_is_64bit())
return EFI_SUCCESS;
/* check for 5 level paging support */
if (native_cpuid_eax(0) < 7 ||
!(native_cpuid_ecx(7) & (1 << (X86_FEATURE_LA57 & 31))))
return EFI_SUCCESS;
/* allocate some 32-bit addressable memory for code and a page table */
status = efi_allocate_pages(2 * PAGE_SIZE, (unsigned long *)&la57_code,
U32_MAX);
if (status != EFI_SUCCESS)
return status;
la57_toggle = memcpy(la57_code, trampoline_32bit_src, tmpl_size);
memset(la57_code + tmpl_size, 0x90, PAGE_SIZE - tmpl_size);
/*
* To avoid the need to allocate a 32-bit addressable stack, the
* trampoline uses a LJMP instruction to switch back to long mode.
* LJMP takes an absolute destination address, which needs to be
* fixed up at runtime.
*/
*(u32 *)&la57_code[trampoline_ljmp_imm_offset] += (unsigned long)la57_code;
efi_adjust_memory_range_protection((unsigned long)la57_toggle, PAGE_SIZE);
return EFI_SUCCESS;
}
void efi_5level_switch(void)
{
bool want_la57 = IS_ENABLED(CONFIG_X86_5LEVEL) && !efi_no5lvl;
bool have_la57 = native_read_cr4() & X86_CR4_LA57;
bool need_toggle = want_la57 ^ have_la57;
u64 *pgt = (void *)la57_toggle + PAGE_SIZE;
u64 *cr3 = (u64 *)__native_read_cr3();
u64 *new_cr3;
if (!la57_toggle || !need_toggle)
return;
if (!have_la57) {
/*
* 5 level paging will be enabled, so a root level page needs
* to be allocated from the 32-bit addressable physical region,
* with its first entry referring to the existing hierarchy.
*/
new_cr3 = memset(pgt, 0, PAGE_SIZE);
new_cr3[0] = (u64)cr3 | _PAGE_TABLE_NOENC;
} else {
/* take the new root table pointer from the current entry #0 */
new_cr3 = (u64 *)(cr3[0] & PAGE_MASK);
/* copy the new root table if it is not 32-bit addressable */
if ((u64)new_cr3 > U32_MAX)
new_cr3 = memcpy(pgt, new_cr3, PAGE_SIZE);
}
native_load_gdt(&(struct desc_ptr){ sizeof(gdt) - 1, (u64)gdt });
la57_toggle(new_cr3);
}
| linux-master | drivers/firmware/efi/libstub/x86-5lvl.c |
// SPDX-License-Identifier: GPL-2.0
#include <linux/efi.h>
#include <linux/screen_info.h>
#include <asm/efi.h>
#include "efistub.h"
/*
* There are two ways of populating the core kernel's struct screen_info via the stub:
* - using a configuration table, like below, which relies on the EFI init code
* to locate the table and copy the contents;
* - by linking directly to the core kernel's copy of the global symbol.
*
* The latter is preferred because it makes the EFIFB earlycon available very
* early, but it only works if the EFI stub is part of the core kernel image
* itself. The zboot decompressor can only use the configuration table
* approach.
*/
static efi_guid_t screen_info_guid = LINUX_EFI_SCREEN_INFO_TABLE_GUID;
struct screen_info *__alloc_screen_info(void)
{
struct screen_info *si;
efi_status_t status;
status = efi_bs_call(allocate_pool, EFI_ACPI_RECLAIM_MEMORY,
sizeof(*si), (void **)&si);
if (status != EFI_SUCCESS)
return NULL;
status = efi_bs_call(install_configuration_table,
&screen_info_guid, si);
if (status == EFI_SUCCESS)
return si;
efi_bs_call(free_pool, si);
return NULL;
}
void free_screen_info(struct screen_info *si)
{
if (!si)
return;
efi_bs_call(install_configuration_table, &screen_info_guid, NULL);
efi_bs_call(free_pool, si);
}
| linux-master | drivers/firmware/efi/libstub/screen_info.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Helper functions used by the EFI stub on multiple
* architectures. This should be #included by the EFI stub
* implementation files.
*
* Copyright 2011 Intel Corporation; author Matt Fleming
*/
#include <linux/efi.h>
#include <asm/efi.h>
#include "efistub.h"
#define MAX_FILENAME_SIZE 256
/*
* Some firmware implementations have problems reading files in one go.
* A read chunk size of 1MB seems to work for most platforms.
*
* Unfortunately, reading files in chunks triggers *other* bugs on some
* platforms, so we provide a way to disable this workaround, which can
* be done by passing "efi=nochunk" on the EFI boot stub command line.
*
* If you experience issues with initrd images being corrupt it's worth
* trying efi=nochunk, but chunking is enabled by default on x86 because
* there are far more machines that require the workaround than those that
* break with it enabled.
*/
#define EFI_READ_CHUNK_SIZE SZ_1M
struct finfo {
efi_file_info_t info;
efi_char16_t filename[MAX_FILENAME_SIZE];
};
static efi_status_t efi_open_file(efi_file_protocol_t *volume,
struct finfo *fi,
efi_file_protocol_t **handle,
unsigned long *file_size)
{
efi_guid_t info_guid = EFI_FILE_INFO_ID;
efi_file_protocol_t *fh;
unsigned long info_sz;
efi_status_t status;
efi_char16_t *c;
/* Replace UNIX dir separators with EFI standard ones */
for (c = fi->filename; *c != L'\0'; c++) {
if (*c == L'/')
*c = L'\\';
}
status = efi_call_proto(volume, open, &fh, fi->filename,
EFI_FILE_MODE_READ, 0);
if (status != EFI_SUCCESS) {
efi_err("Failed to open file: %ls\n", fi->filename);
return status;
}
info_sz = sizeof(struct finfo);
status = efi_call_proto(fh, get_info, &info_guid, &info_sz, fi);
if (status != EFI_SUCCESS) {
efi_err("Failed to get file info\n");
efi_call_proto(fh, close);
return status;
}
*handle = fh;
*file_size = fi->info.file_size;
return EFI_SUCCESS;
}
static efi_status_t efi_open_volume(efi_loaded_image_t *image,
efi_file_protocol_t **fh)
{
efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
efi_simple_file_system_protocol_t *io;
efi_status_t status;
status = efi_bs_call(handle_protocol, efi_table_attr(image, device_handle),
&fs_proto, (void **)&io);
if (status != EFI_SUCCESS) {
efi_err("Failed to handle fs_proto\n");
return status;
}
status = efi_call_proto(io, open_volume, fh);
if (status != EFI_SUCCESS)
efi_err("Failed to open volume\n");
return status;
}
static int find_file_option(const efi_char16_t *cmdline, int cmdline_len,
const efi_char16_t *prefix, int prefix_size,
efi_char16_t *result, int result_len)
{
int prefix_len = prefix_size / 2;
bool found = false;
int i;
for (i = prefix_len; i < cmdline_len; i++) {
if (!memcmp(&cmdline[i - prefix_len], prefix, prefix_size)) {
found = true;
break;
}
}
if (!found)
return 0;
/* Skip any leading slashes */
while (i < cmdline_len && (cmdline[i] == L'/' || cmdline[i] == L'\\'))
i++;
while (--result_len > 0 && i < cmdline_len) {
efi_char16_t c = cmdline[i++];
if (c == L'\0' || c == L'\n' || c == L' ')
break;
*result++ = c;
}
*result = L'\0';
return i;
}
static efi_status_t efi_open_device_path(efi_file_protocol_t **volume,
struct finfo *fi)
{
efi_guid_t text_to_dp_guid = EFI_DEVICE_PATH_FROM_TEXT_PROTOCOL_GUID;
static efi_device_path_from_text_protocol_t *text_to_dp = NULL;
efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
efi_device_path_protocol_t *initrd_dp;
efi_simple_file_system_protocol_t *io;
struct efi_file_path_dev_path *fpath;
efi_handle_t handle;
efi_status_t status;
/* See if the text to device path protocol exists */
if (!text_to_dp &&
efi_bs_call(locate_protocol, &text_to_dp_guid, NULL,
(void **)&text_to_dp) != EFI_SUCCESS)
return EFI_UNSUPPORTED;
/* Convert the filename wide string into a device path */
initrd_dp = efi_fn_call(text_to_dp, convert_text_to_device_path,
fi->filename);
/* Check whether the device path in question implements simple FS */
if ((efi_bs_call(locate_device_path, &fs_proto, &initrd_dp, &handle) ?:
efi_bs_call(handle_protocol, handle, &fs_proto, (void **)&io))
!= EFI_SUCCESS)
return EFI_NOT_FOUND;
/* Check whether the remaining device path is a file device path */
if (initrd_dp->type != EFI_DEV_MEDIA ||
initrd_dp->sub_type != EFI_DEV_MEDIA_FILE) {
efi_warn("Unexpected device path node type: (%x, %x)\n",
initrd_dp->type, initrd_dp->sub_type);
return EFI_LOAD_ERROR;
}
/* Copy the remaining file path into the fi structure */
fpath = (struct efi_file_path_dev_path *)initrd_dp;
memcpy(fi->filename, fpath->filename,
min(sizeof(fi->filename),
fpath->header.length - sizeof(fpath->header)));
status = efi_call_proto(io, open_volume, volume);
if (status != EFI_SUCCESS)
efi_err("Failed to open volume\n");
return status;
}
/*
* Check the cmdline for a LILO-style file= arguments.
*
* We only support loading a file from the same filesystem as
* the kernel image.
*/
efi_status_t handle_cmdline_files(efi_loaded_image_t *image,
const efi_char16_t *optstr,
int optstr_size,
unsigned long soft_limit,
unsigned long hard_limit,
unsigned long *load_addr,
unsigned long *load_size)
{
const efi_char16_t *cmdline = efi_table_attr(image, load_options);
u32 cmdline_len = efi_table_attr(image, load_options_size);
unsigned long efi_chunk_size = ULONG_MAX;
efi_file_protocol_t *volume = NULL;
efi_file_protocol_t *file;
unsigned long alloc_addr;
unsigned long alloc_size;
efi_status_t status;
int offset;
if (!load_addr || !load_size)
return EFI_INVALID_PARAMETER;
efi_apply_loadoptions_quirk((const void **)&cmdline, &cmdline_len);
cmdline_len /= sizeof(*cmdline);
if (IS_ENABLED(CONFIG_X86) && !efi_nochunk)
efi_chunk_size = EFI_READ_CHUNK_SIZE;
alloc_addr = alloc_size = 0;
do {
struct finfo fi;
unsigned long size;
void *addr;
offset = find_file_option(cmdline, cmdline_len,
optstr, optstr_size,
fi.filename, ARRAY_SIZE(fi.filename));
if (!offset)
break;
cmdline += offset;
cmdline_len -= offset;
status = efi_open_device_path(&volume, &fi);
if (status == EFI_UNSUPPORTED || status == EFI_NOT_FOUND)
/* try the volume that holds the kernel itself */
status = efi_open_volume(image, &volume);
if (status != EFI_SUCCESS)
goto err_free_alloc;
status = efi_open_file(volume, &fi, &file, &size);
if (status != EFI_SUCCESS)
goto err_close_volume;
/*
* Check whether the existing allocation can contain the next
* file. This condition will also trigger naturally during the
* first (and typically only) iteration of the loop, given that
* alloc_size == 0 in that case.
*/
if (round_up(alloc_size + size, EFI_ALLOC_ALIGN) >
round_up(alloc_size, EFI_ALLOC_ALIGN)) {
unsigned long old_addr = alloc_addr;
status = EFI_OUT_OF_RESOURCES;
if (soft_limit < hard_limit)
status = efi_allocate_pages(alloc_size + size,
&alloc_addr,
soft_limit);
if (status == EFI_OUT_OF_RESOURCES)
status = efi_allocate_pages(alloc_size + size,
&alloc_addr,
hard_limit);
if (status != EFI_SUCCESS) {
efi_err("Failed to allocate memory for files\n");
goto err_close_file;
}
if (old_addr != 0) {
/*
* This is not the first time we've gone
* around this loop, and so we are loading
* multiple files that need to be concatenated
* and returned in a single buffer.
*/
memcpy((void *)alloc_addr, (void *)old_addr, alloc_size);
efi_free(alloc_size, old_addr);
}
}
addr = (void *)alloc_addr + alloc_size;
alloc_size += size;
while (size) {
unsigned long chunksize = min(size, efi_chunk_size);
status = efi_call_proto(file, read, &chunksize, addr);
if (status != EFI_SUCCESS) {
efi_err("Failed to read file\n");
goto err_close_file;
}
addr += chunksize;
size -= chunksize;
}
efi_call_proto(file, close);
efi_call_proto(volume, close);
} while (offset > 0);
*load_addr = alloc_addr;
*load_size = alloc_size;
if (*load_size == 0)
return EFI_NOT_READY;
return EFI_SUCCESS;
err_close_file:
efi_call_proto(file, close);
err_close_volume:
efi_call_proto(volume, close);
err_free_alloc:
efi_free(alloc_size, alloc_addr);
return status;
}
| linux-master | drivers/firmware/efi/libstub/file.c |
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/efi.h>
#include <linux/screen_info.h>
#include <asm/efi.h>
#include "efistub.h"
static unsigned long screen_info_offset;
struct screen_info *alloc_screen_info(void)
{
if (IS_ENABLED(CONFIG_ARM))
return __alloc_screen_info();
return (void *)&screen_info + screen_info_offset;
}
/*
* EFI entry point for the generic EFI stub used by ARM, arm64, RISC-V and
* LoongArch. This is the entrypoint that is described in the PE/COFF header
* of the core kernel.
*/
efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
efi_system_table_t *systab)
{
efi_loaded_image_t *image;
efi_status_t status;
unsigned long image_addr;
unsigned long image_size = 0;
/* addr/point and size pairs for memory management*/
char *cmdline_ptr = NULL;
efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID;
unsigned long reserve_addr = 0;
unsigned long reserve_size = 0;
WRITE_ONCE(efi_system_table, systab);
/* Check if we were booted by the EFI firmware */
if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
return EFI_INVALID_PARAMETER;
/*
* Get a handle to the loaded image protocol. This is used to get
* information about the running image, such as size and the command
* line.
*/
status = efi_bs_call(handle_protocol, handle, &loaded_image_proto,
(void *)&image);
if (status != EFI_SUCCESS) {
efi_err("Failed to get loaded image protocol\n");
return status;
}
status = efi_handle_cmdline(image, &cmdline_ptr);
if (status != EFI_SUCCESS)
return status;
efi_info("Booting Linux Kernel...\n");
status = handle_kernel_image(&image_addr, &image_size,
&reserve_addr,
&reserve_size,
image, handle);
if (status != EFI_SUCCESS) {
efi_err("Failed to relocate kernel\n");
return status;
}
screen_info_offset = image_addr - (unsigned long)image->image_base;
status = efi_stub_common(handle, image, image_addr, cmdline_ptr);
efi_free(image_size, image_addr);
efi_free(reserve_size, reserve_addr);
return status;
}
| linux-master | drivers/firmware/efi/libstub/efi-stub-entry.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Helper functions used by the EFI stub on multiple
* architectures to deal with physical address space randomization.
*/
#include <linux/efi.h>
#include "efistub.h"
/**
* efi_kaslr_get_phys_seed() - Get random seed for physical kernel KASLR
* @image_handle: Handle to the image
*
* If KASLR is not disabled, obtain a random seed using EFI_RNG_PROTOCOL
* that will be used to move the kernel physical mapping.
*
* Return: the random seed
*/
u32 efi_kaslr_get_phys_seed(efi_handle_t image_handle)
{
efi_status_t status;
u32 phys_seed;
efi_guid_t li_fixed_proto = LINUX_EFI_LOADED_IMAGE_FIXED_GUID;
void *p;
if (!IS_ENABLED(CONFIG_RANDOMIZE_BASE))
return 0;
if (efi_nokaslr) {
efi_info("KASLR disabled on kernel command line\n");
} else if (efi_bs_call(handle_protocol, image_handle,
&li_fixed_proto, &p) == EFI_SUCCESS) {
efi_info("Image placement fixed by loader\n");
} else {
status = efi_get_random_bytes(sizeof(phys_seed),
(u8 *)&phys_seed);
if (status == EFI_SUCCESS) {
return phys_seed;
} else if (status == EFI_NOT_FOUND) {
efi_info("EFI_RNG_PROTOCOL unavailable\n");
efi_nokaslr = true;
} else if (status != EFI_SUCCESS) {
efi_err("efi_get_random_bytes() failed (0x%lx)\n",
status);
efi_nokaslr = true;
}
}
return 0;
}
/*
* Distro versions of GRUB may ignore the BSS allocation entirely (i.e., fail
* to provide space, and fail to zero it). Check for this condition by double
* checking that the first and the last byte of the image are covered by the
* same EFI memory map entry.
*/
static bool check_image_region(u64 base, u64 size)
{
struct efi_boot_memmap *map;
efi_status_t status;
bool ret = false;
int map_offset;
status = efi_get_memory_map(&map, false);
if (status != EFI_SUCCESS)
return false;
for (map_offset = 0; map_offset < map->map_size; map_offset += map->desc_size) {
efi_memory_desc_t *md = (void *)map->map + map_offset;
u64 end = md->phys_addr + md->num_pages * EFI_PAGE_SIZE;
/*
* Find the region that covers base, and return whether
* it covers base+size bytes.
*/
if (base >= md->phys_addr && base < end) {
ret = (base + size) <= end;
break;
}
}
efi_bs_call(free_pool, map);
return ret;
}
/**
* efi_kaslr_relocate_kernel() - Relocate the kernel (random if KASLR enabled)
* @image_addr: Pointer to the current kernel location
* @reserve_addr: Pointer to the relocated kernel location
* @reserve_size: Size of the relocated kernel
* @kernel_size: Size of the text + data
* @kernel_codesize: Size of the text
* @kernel_memsize: Size of the text + data + bss
* @phys_seed: Random seed used for the relocation
*
* If KASLR is not enabled, this function relocates the kernel to a fixed
* address (or leave it as its current location). If KASLR is enabled, the
* kernel physical location is randomized using the seed in parameter.
*
* Return: status code, EFI_SUCCESS if relocation is successful
*/
efi_status_t efi_kaslr_relocate_kernel(unsigned long *image_addr,
unsigned long *reserve_addr,
unsigned long *reserve_size,
unsigned long kernel_size,
unsigned long kernel_codesize,
unsigned long kernel_memsize,
u32 phys_seed)
{
efi_status_t status;
u64 min_kimg_align = efi_get_kimg_min_align();
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && phys_seed != 0) {
/*
* If KASLR is enabled, and we have some randomness available,
* locate the kernel at a randomized offset in physical memory.
*/
status = efi_random_alloc(*reserve_size, min_kimg_align,
reserve_addr, phys_seed,
EFI_LOADER_CODE, EFI_ALLOC_LIMIT);
if (status != EFI_SUCCESS)
efi_warn("efi_random_alloc() failed: 0x%lx\n", status);
} else {
status = EFI_OUT_OF_RESOURCES;
}
if (status != EFI_SUCCESS) {
if (!check_image_region(*image_addr, kernel_memsize)) {
efi_err("FIRMWARE BUG: Image BSS overlaps adjacent EFI memory region\n");
} else if (IS_ALIGNED(*image_addr, min_kimg_align) &&
(unsigned long)_end < EFI_ALLOC_LIMIT) {
/*
* Just execute from wherever we were loaded by the
* UEFI PE/COFF loader if the placement is suitable.
*/
*reserve_size = 0;
return EFI_SUCCESS;
}
status = efi_allocate_pages_aligned(*reserve_size, reserve_addr,
ULONG_MAX, min_kimg_align,
EFI_LOADER_CODE);
if (status != EFI_SUCCESS) {
efi_err("Failed to relocate kernel\n");
*reserve_size = 0;
return status;
}
}
memcpy((void *)*reserve_addr, (void *)*image_addr, kernel_size);
*image_addr = *reserve_addr;
efi_icache_sync(*image_addr, *image_addr + kernel_codesize);
efi_remap_image(*image_addr, *reserve_size, kernel_codesize);
return status;
}
| linux-master | drivers/firmware/efi/libstub/kaslr.c |
// SPDX-License-Identifier: GPL-2.0
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/types.h>
char *skip_spaces(const char *str)
{
while (isspace(*str))
++str;
return (char *)str;
}
| linux-master | drivers/firmware/efi/libstub/skip_spaces.c |
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/bitmap.h>
#include <linux/math.h>
#include <linux/minmax.h>
/*
* Common helper for find_next_bit() function family
* @FETCH: The expression that fetches and pre-processes each word of bitmap(s)
* @MUNGE: The expression that post-processes a word containing found bit (may be empty)
* @size: The bitmap size in bits
* @start: The bitnumber to start searching at
*/
#define FIND_NEXT_BIT(FETCH, MUNGE, size, start) \
({ \
unsigned long mask, idx, tmp, sz = (size), __start = (start); \
\
if (unlikely(__start >= sz)) \
goto out; \
\
mask = MUNGE(BITMAP_FIRST_WORD_MASK(__start)); \
idx = __start / BITS_PER_LONG; \
\
for (tmp = (FETCH) & mask; !tmp; tmp = (FETCH)) { \
if ((idx + 1) * BITS_PER_LONG >= sz) \
goto out; \
idx++; \
} \
\
sz = min(idx * BITS_PER_LONG + __ffs(MUNGE(tmp)), sz); \
out: \
sz; \
})
unsigned long _find_next_bit(const unsigned long *addr, unsigned long nbits, unsigned long start)
{
return FIND_NEXT_BIT(addr[idx], /* nop */, nbits, start);
}
unsigned long _find_next_zero_bit(const unsigned long *addr, unsigned long nbits,
unsigned long start)
{
return FIND_NEXT_BIT(~addr[idx], /* nop */, nbits, start);
}
| linux-master | drivers/firmware/efi/libstub/find.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2016 Linaro Ltd; <[email protected]>
*/
#include <linux/efi.h>
#include <linux/log2.h>
#include <asm/efi.h>
#include "efistub.h"
/*
* Return the number of slots covered by this entry, i.e., the number of
* addresses it covers that are suitably aligned and supply enough room
* for the allocation.
*/
static unsigned long get_entry_num_slots(efi_memory_desc_t *md,
unsigned long size,
unsigned long align_shift,
u64 alloc_limit)
{
unsigned long align = 1UL << align_shift;
u64 first_slot, last_slot, region_end;
if (md->type != EFI_CONVENTIONAL_MEMORY)
return 0;
if (efi_soft_reserve_enabled() &&
(md->attribute & EFI_MEMORY_SP))
return 0;
region_end = min(md->phys_addr + md->num_pages * EFI_PAGE_SIZE - 1,
alloc_limit);
if (region_end < size)
return 0;
first_slot = round_up(md->phys_addr, align);
last_slot = round_down(region_end - size + 1, align);
if (first_slot > last_slot)
return 0;
return ((unsigned long)(last_slot - first_slot) >> align_shift) + 1;
}
/*
* The UEFI memory descriptors have a virtual address field that is only used
* when installing the virtual mapping using SetVirtualAddressMap(). Since it
* is unused here, we can reuse it to keep track of each descriptor's slot
* count.
*/
#define MD_NUM_SLOTS(md) ((md)->virt_addr)
efi_status_t efi_random_alloc(unsigned long size,
unsigned long align,
unsigned long *addr,
unsigned long random_seed,
int memory_type,
unsigned long alloc_limit)
{
unsigned long total_slots = 0, target_slot;
unsigned long total_mirrored_slots = 0;
struct efi_boot_memmap *map;
efi_status_t status;
int map_offset;
status = efi_get_memory_map(&map, false);
if (status != EFI_SUCCESS)
return status;
if (align < EFI_ALLOC_ALIGN)
align = EFI_ALLOC_ALIGN;
size = round_up(size, EFI_ALLOC_ALIGN);
/* count the suitable slots in each memory map entry */
for (map_offset = 0; map_offset < map->map_size; map_offset += map->desc_size) {
efi_memory_desc_t *md = (void *)map->map + map_offset;
unsigned long slots;
slots = get_entry_num_slots(md, size, ilog2(align), alloc_limit);
MD_NUM_SLOTS(md) = slots;
total_slots += slots;
if (md->attribute & EFI_MEMORY_MORE_RELIABLE)
total_mirrored_slots += slots;
}
/* consider only mirrored slots for randomization if any exist */
if (total_mirrored_slots > 0)
total_slots = total_mirrored_slots;
/* find a random number between 0 and total_slots */
target_slot = (total_slots * (u64)(random_seed & U32_MAX)) >> 32;
/*
* target_slot is now a value in the range [0, total_slots), and so
* it corresponds with exactly one of the suitable slots we recorded
* when iterating over the memory map the first time around.
*
* So iterate over the memory map again, subtracting the number of
* slots of each entry at each iteration, until we have found the entry
* that covers our chosen slot. Use the residual value of target_slot
* to calculate the randomly chosen address, and allocate it directly
* using EFI_ALLOCATE_ADDRESS.
*/
status = EFI_OUT_OF_RESOURCES;
for (map_offset = 0; map_offset < map->map_size; map_offset += map->desc_size) {
efi_memory_desc_t *md = (void *)map->map + map_offset;
efi_physical_addr_t target;
unsigned long pages;
if (total_mirrored_slots > 0 &&
!(md->attribute & EFI_MEMORY_MORE_RELIABLE))
continue;
if (target_slot >= MD_NUM_SLOTS(md)) {
target_slot -= MD_NUM_SLOTS(md);
continue;
}
target = round_up(md->phys_addr, align) + target_slot * align;
pages = size / EFI_PAGE_SIZE;
status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS,
memory_type, pages, &target);
if (status == EFI_SUCCESS)
*addr = target;
break;
}
efi_bs_call(free_pool, map);
return status;
}
| linux-master | drivers/firmware/efi/libstub/randomalloc.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Helper functions used by the EFI stub on multiple
* architectures. This should be #included by the EFI stub
* implementation files.
*
* Copyright 2011 Intel Corporation; author Matt Fleming
*/
#include <linux/stdarg.h>
#include <linux/efi.h>
#include <linux/kernel.h>
#include <asm/efi.h>
#include <asm/setup.h>
#include "efistub.h"
bool efi_nochunk;
bool efi_nokaslr = !IS_ENABLED(CONFIG_RANDOMIZE_BASE);
bool efi_novamap;
static bool efi_noinitrd;
static bool efi_nosoftreserve;
static bool efi_disable_pci_dma = IS_ENABLED(CONFIG_EFI_DISABLE_PCI_DMA);
bool __pure __efi_soft_reserve_enabled(void)
{
return !efi_nosoftreserve;
}
/**
* efi_parse_options() - Parse EFI command line options
* @cmdline: kernel command line
*
* Parse the ASCII string @cmdline for EFI options, denoted by the efi=
* option, e.g. efi=nochunk.
*
* It should be noted that efi= is parsed in two very different
* environments, first in the early boot environment of the EFI boot
* stub, and subsequently during the kernel boot.
*
* Return: status code
*/
efi_status_t efi_parse_options(char const *cmdline)
{
size_t len;
efi_status_t status;
char *str, *buf;
if (!cmdline)
return EFI_SUCCESS;
len = strnlen(cmdline, COMMAND_LINE_SIZE - 1) + 1;
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, len, (void **)&buf);
if (status != EFI_SUCCESS)
return status;
memcpy(buf, cmdline, len - 1);
buf[len - 1] = '\0';
str = skip_spaces(buf);
while (*str) {
char *param, *val;
str = next_arg(str, ¶m, &val);
if (!val && !strcmp(param, "--"))
break;
if (!strcmp(param, "nokaslr")) {
efi_nokaslr = true;
} else if (!strcmp(param, "quiet")) {
efi_loglevel = CONSOLE_LOGLEVEL_QUIET;
} else if (!strcmp(param, "noinitrd")) {
efi_noinitrd = true;
} else if (IS_ENABLED(CONFIG_X86_64) && !strcmp(param, "no5lvl")) {
efi_no5lvl = true;
} else if (!strcmp(param, "efi") && val) {
efi_nochunk = parse_option_str(val, "nochunk");
efi_novamap |= parse_option_str(val, "novamap");
efi_nosoftreserve = IS_ENABLED(CONFIG_EFI_SOFT_RESERVE) &&
parse_option_str(val, "nosoftreserve");
if (parse_option_str(val, "disable_early_pci_dma"))
efi_disable_pci_dma = true;
if (parse_option_str(val, "no_disable_early_pci_dma"))
efi_disable_pci_dma = false;
if (parse_option_str(val, "debug"))
efi_loglevel = CONSOLE_LOGLEVEL_DEBUG;
} else if (!strcmp(param, "video") &&
val && strstarts(val, "efifb:")) {
efi_parse_option_graphics(val + strlen("efifb:"));
}
}
efi_bs_call(free_pool, buf);
return EFI_SUCCESS;
}
/*
* The EFI_LOAD_OPTION descriptor has the following layout:
* u32 Attributes;
* u16 FilePathListLength;
* u16 Description[];
* efi_device_path_protocol_t FilePathList[];
* u8 OptionalData[];
*
* This function validates and unpacks the variable-size data fields.
*/
static
bool efi_load_option_unpack(efi_load_option_unpacked_t *dest,
const efi_load_option_t *src, size_t size)
{
const void *pos;
u16 c;
efi_device_path_protocol_t header;
const efi_char16_t *description;
const efi_device_path_protocol_t *file_path_list;
if (size < offsetof(efi_load_option_t, variable_data))
return false;
pos = src->variable_data;
size -= offsetof(efi_load_option_t, variable_data);
if ((src->attributes & ~EFI_LOAD_OPTION_MASK) != 0)
return false;
/* Scan description. */
description = pos;
do {
if (size < sizeof(c))
return false;
c = *(const u16 *)pos;
pos += sizeof(c);
size -= sizeof(c);
} while (c != L'\0');
/* Scan file_path_list. */
file_path_list = pos;
do {
if (size < sizeof(header))
return false;
header = *(const efi_device_path_protocol_t *)pos;
if (header.length < sizeof(header))
return false;
if (size < header.length)
return false;
pos += header.length;
size -= header.length;
} while ((header.type != EFI_DEV_END_PATH && header.type != EFI_DEV_END_PATH2) ||
(header.sub_type != EFI_DEV_END_ENTIRE));
if (pos != (const void *)file_path_list + src->file_path_list_length)
return false;
dest->attributes = src->attributes;
dest->file_path_list_length = src->file_path_list_length;
dest->description = description;
dest->file_path_list = file_path_list;
dest->optional_data_size = size;
dest->optional_data = size ? pos : NULL;
return true;
}
/*
* At least some versions of Dell firmware pass the entire contents of the
* Boot#### variable, i.e. the EFI_LOAD_OPTION descriptor, rather than just the
* OptionalData field.
*
* Detect this case and extract OptionalData.
*/
void efi_apply_loadoptions_quirk(const void **load_options, u32 *load_options_size)
{
const efi_load_option_t *load_option = *load_options;
efi_load_option_unpacked_t load_option_unpacked;
if (!IS_ENABLED(CONFIG_X86))
return;
if (!load_option)
return;
if (*load_options_size < sizeof(*load_option))
return;
if ((load_option->attributes & ~EFI_LOAD_OPTION_BOOT_MASK) != 0)
return;
if (!efi_load_option_unpack(&load_option_unpacked, load_option, *load_options_size))
return;
efi_warn_once(FW_BUG "LoadOptions is an EFI_LOAD_OPTION descriptor\n");
efi_warn_once(FW_BUG "Using OptionalData as a workaround\n");
*load_options = load_option_unpacked.optional_data;
*load_options_size = load_option_unpacked.optional_data_size;
}
enum efistub_event {
EFISTUB_EVT_INITRD,
EFISTUB_EVT_LOAD_OPTIONS,
EFISTUB_EVT_COUNT,
};
#define STR_WITH_SIZE(s) sizeof(s), s
static const struct {
u32 pcr_index;
u32 event_id;
u32 event_data_len;
u8 event_data[52];
} events[] = {
[EFISTUB_EVT_INITRD] = {
9,
INITRD_EVENT_TAG_ID,
STR_WITH_SIZE("Linux initrd")
},
[EFISTUB_EVT_LOAD_OPTIONS] = {
9,
LOAD_OPTIONS_EVENT_TAG_ID,
STR_WITH_SIZE("LOADED_IMAGE::LoadOptions")
},
};
static efi_status_t efi_measure_tagged_event(unsigned long load_addr,
unsigned long load_size,
enum efistub_event event)
{
efi_guid_t tcg2_guid = EFI_TCG2_PROTOCOL_GUID;
efi_tcg2_protocol_t *tcg2 = NULL;
efi_status_t status;
efi_bs_call(locate_protocol, &tcg2_guid, NULL, (void **)&tcg2);
if (tcg2) {
struct efi_measured_event {
efi_tcg2_event_t event_data;
efi_tcg2_tagged_event_t tagged_event;
u8 tagged_event_data[];
} *evt;
int size = sizeof(*evt) + events[event].event_data_len;
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
(void **)&evt);
if (status != EFI_SUCCESS)
goto fail;
evt->event_data = (struct efi_tcg2_event){
.event_size = size,
.event_header.header_size = sizeof(evt->event_data.event_header),
.event_header.header_version = EFI_TCG2_EVENT_HEADER_VERSION,
.event_header.pcr_index = events[event].pcr_index,
.event_header.event_type = EV_EVENT_TAG,
};
evt->tagged_event = (struct efi_tcg2_tagged_event){
.tagged_event_id = events[event].event_id,
.tagged_event_data_size = events[event].event_data_len,
};
memcpy(evt->tagged_event_data, events[event].event_data,
events[event].event_data_len);
status = efi_call_proto(tcg2, hash_log_extend_event, 0,
load_addr, load_size, &evt->event_data);
efi_bs_call(free_pool, evt);
if (status != EFI_SUCCESS)
goto fail;
return EFI_SUCCESS;
}
return EFI_UNSUPPORTED;
fail:
efi_warn("Failed to measure data for event %d: 0x%lx\n", event, status);
return status;
}
/*
* Convert the unicode UEFI command line to ASCII to pass to kernel.
* Size of memory allocated return in *cmd_line_len.
* Returns NULL on error.
*/
char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len)
{
const efi_char16_t *options = efi_table_attr(image, load_options);
u32 options_size = efi_table_attr(image, load_options_size);
int options_bytes = 0, safe_options_bytes = 0; /* UTF-8 bytes */
unsigned long cmdline_addr = 0;
const efi_char16_t *s2;
bool in_quote = false;
efi_status_t status;
u32 options_chars;
if (options_size > 0)
efi_measure_tagged_event((unsigned long)options, options_size,
EFISTUB_EVT_LOAD_OPTIONS);
efi_apply_loadoptions_quirk((const void **)&options, &options_size);
options_chars = options_size / sizeof(efi_char16_t);
if (options) {
s2 = options;
while (options_bytes < COMMAND_LINE_SIZE && options_chars--) {
efi_char16_t c = *s2++;
if (c < 0x80) {
if (c == L'\0' || c == L'\n')
break;
if (c == L'"')
in_quote = !in_quote;
else if (!in_quote && isspace((char)c))
safe_options_bytes = options_bytes;
options_bytes++;
continue;
}
/*
* Get the number of UTF-8 bytes corresponding to a
* UTF-16 character.
* The first part handles everything in the BMP.
*/
options_bytes += 2 + (c >= 0x800);
/*
* Add one more byte for valid surrogate pairs. Invalid
* surrogates will be replaced with 0xfffd and take up
* only 3 bytes.
*/
if ((c & 0xfc00) == 0xd800) {
/*
* If the very last word is a high surrogate,
* we must ignore it since we can't access the
* low surrogate.
*/
if (!options_chars) {
options_bytes -= 3;
} else if ((*s2 & 0xfc00) == 0xdc00) {
options_bytes++;
options_chars--;
s2++;
}
}
}
if (options_bytes >= COMMAND_LINE_SIZE) {
options_bytes = safe_options_bytes;
efi_err("Command line is too long: truncated to %d bytes\n",
options_bytes);
}
}
options_bytes++; /* NUL termination */
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, options_bytes,
(void **)&cmdline_addr);
if (status != EFI_SUCCESS)
return NULL;
snprintf((char *)cmdline_addr, options_bytes, "%.*ls",
options_bytes - 1, options);
*cmd_line_len = options_bytes;
return (char *)cmdline_addr;
}
/**
* efi_exit_boot_services() - Exit boot services
* @handle: handle of the exiting image
* @priv: argument to be passed to @priv_func
* @priv_func: function to process the memory map before exiting boot services
*
* Handle calling ExitBootServices according to the requirements set out by the
* spec. Obtains the current memory map, and returns that info after calling
* ExitBootServices. The client must specify a function to perform any
* processing of the memory map data prior to ExitBootServices. A client
* specific structure may be passed to the function via priv. The client
* function may be called multiple times.
*
* Return: status code
*/
efi_status_t efi_exit_boot_services(void *handle, void *priv,
efi_exit_boot_map_processing priv_func)
{
struct efi_boot_memmap *map;
efi_status_t status;
if (efi_disable_pci_dma)
efi_pci_disable_bridge_busmaster();
status = efi_get_memory_map(&map, true);
if (status != EFI_SUCCESS)
return status;
status = priv_func(map, priv);
if (status != EFI_SUCCESS) {
efi_bs_call(free_pool, map);
return status;
}
status = efi_bs_call(exit_boot_services, handle, map->map_key);
if (status == EFI_INVALID_PARAMETER) {
/*
* The memory map changed between efi_get_memory_map() and
* exit_boot_services(). Per the UEFI Spec v2.6, Section 6.4:
* EFI_BOOT_SERVICES.ExitBootServices we need to get the
* updated map, and try again. The spec implies one retry
* should be sufficent, which is confirmed against the EDK2
* implementation. Per the spec, we can only invoke
* get_memory_map() and exit_boot_services() - we cannot alloc
* so efi_get_memory_map() cannot be used, and we must reuse
* the buffer. For all practical purposes, the headroom in the
* buffer should account for any changes in the map so the call
* to get_memory_map() is expected to succeed here.
*/
map->map_size = map->buff_size;
status = efi_bs_call(get_memory_map,
&map->map_size,
&map->map,
&map->map_key,
&map->desc_size,
&map->desc_ver);
/* exit_boot_services() was called, thus cannot free */
if (status != EFI_SUCCESS)
return status;
status = priv_func(map, priv);
/* exit_boot_services() was called, thus cannot free */
if (status != EFI_SUCCESS)
return status;
status = efi_bs_call(exit_boot_services, handle, map->map_key);
}
return status;
}
/**
* get_efi_config_table() - retrieve UEFI configuration table
* @guid: GUID of the configuration table to be retrieved
* Return: pointer to the configuration table or NULL
*/
void *get_efi_config_table(efi_guid_t guid)
{
unsigned long tables = efi_table_attr(efi_system_table, tables);
int nr_tables = efi_table_attr(efi_system_table, nr_tables);
int i;
for (i = 0; i < nr_tables; i++) {
efi_config_table_t *t = (void *)tables;
if (efi_guidcmp(t->guid, guid) == 0)
return efi_table_attr(t, table);
tables += efi_is_native() ? sizeof(efi_config_table_t)
: sizeof(efi_config_table_32_t);
}
return NULL;
}
/*
* The LINUX_EFI_INITRD_MEDIA_GUID vendor media device path below provides a way
* for the firmware or bootloader to expose the initrd data directly to the stub
* via the trivial LoadFile2 protocol, which is defined in the UEFI spec, and is
* very easy to implement. It is a simple Linux initrd specific conduit between
* kernel and firmware, allowing us to put the EFI stub (being part of the
* kernel) in charge of where and when to load the initrd, while leaving it up
* to the firmware to decide whether it needs to expose its filesystem hierarchy
* via EFI protocols.
*/
static const struct {
struct efi_vendor_dev_path vendor;
struct efi_generic_dev_path end;
} __packed initrd_dev_path = {
{
{
EFI_DEV_MEDIA,
EFI_DEV_MEDIA_VENDOR,
sizeof(struct efi_vendor_dev_path),
},
LINUX_EFI_INITRD_MEDIA_GUID
}, {
EFI_DEV_END_PATH,
EFI_DEV_END_ENTIRE,
sizeof(struct efi_generic_dev_path)
}
};
/**
* efi_load_initrd_dev_path() - load the initrd from the Linux initrd device path
* @initrd: pointer of struct to store the address where the initrd was loaded
* and the size of the loaded initrd
* @max: upper limit for the initrd memory allocation
*
* Return:
* * %EFI_SUCCESS if the initrd was loaded successfully, in which
* case @load_addr and @load_size are assigned accordingly
* * %EFI_NOT_FOUND if no LoadFile2 protocol exists on the initrd device path
* * %EFI_OUT_OF_RESOURCES if memory allocation failed
* * %EFI_LOAD_ERROR in all other cases
*/
static
efi_status_t efi_load_initrd_dev_path(struct linux_efi_initrd *initrd,
unsigned long max)
{
efi_guid_t lf2_proto_guid = EFI_LOAD_FILE2_PROTOCOL_GUID;
efi_device_path_protocol_t *dp;
efi_load_file2_protocol_t *lf2;
efi_handle_t handle;
efi_status_t status;
dp = (efi_device_path_protocol_t *)&initrd_dev_path;
status = efi_bs_call(locate_device_path, &lf2_proto_guid, &dp, &handle);
if (status != EFI_SUCCESS)
return status;
status = efi_bs_call(handle_protocol, handle, &lf2_proto_guid,
(void **)&lf2);
if (status != EFI_SUCCESS)
return status;
initrd->size = 0;
status = efi_call_proto(lf2, load_file, dp, false, &initrd->size, NULL);
if (status != EFI_BUFFER_TOO_SMALL)
return EFI_LOAD_ERROR;
status = efi_allocate_pages(initrd->size, &initrd->base, max);
if (status != EFI_SUCCESS)
return status;
status = efi_call_proto(lf2, load_file, dp, false, &initrd->size,
(void *)initrd->base);
if (status != EFI_SUCCESS) {
efi_free(initrd->size, initrd->base);
return EFI_LOAD_ERROR;
}
return EFI_SUCCESS;
}
static
efi_status_t efi_load_initrd_cmdline(efi_loaded_image_t *image,
struct linux_efi_initrd *initrd,
unsigned long soft_limit,
unsigned long hard_limit)
{
if (image == NULL)
return EFI_UNSUPPORTED;
return handle_cmdline_files(image, L"initrd=", sizeof(L"initrd=") - 2,
soft_limit, hard_limit,
&initrd->base, &initrd->size);
}
/**
* efi_load_initrd() - Load initial RAM disk
* @image: EFI loaded image protocol
* @soft_limit: preferred address for loading the initrd
* @hard_limit: upper limit address for loading the initrd
*
* Return: status code
*/
efi_status_t efi_load_initrd(efi_loaded_image_t *image,
unsigned long soft_limit,
unsigned long hard_limit,
const struct linux_efi_initrd **out)
{
efi_guid_t tbl_guid = LINUX_EFI_INITRD_MEDIA_GUID;
efi_status_t status = EFI_SUCCESS;
struct linux_efi_initrd initrd, *tbl;
if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD) || efi_noinitrd)
return EFI_SUCCESS;
status = efi_load_initrd_dev_path(&initrd, hard_limit);
if (status == EFI_SUCCESS) {
efi_info("Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path\n");
if (initrd.size > 0 &&
efi_measure_tagged_event(initrd.base, initrd.size,
EFISTUB_EVT_INITRD) == EFI_SUCCESS)
efi_info("Measured initrd data into PCR 9\n");
} else if (status == EFI_NOT_FOUND) {
status = efi_load_initrd_cmdline(image, &initrd, soft_limit,
hard_limit);
/* command line loader disabled or no initrd= passed? */
if (status == EFI_UNSUPPORTED || status == EFI_NOT_READY)
return EFI_SUCCESS;
if (status == EFI_SUCCESS)
efi_info("Loaded initrd from command line option\n");
}
if (status != EFI_SUCCESS)
goto failed;
status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, sizeof(initrd),
(void **)&tbl);
if (status != EFI_SUCCESS)
goto free_initrd;
*tbl = initrd;
status = efi_bs_call(install_configuration_table, &tbl_guid, tbl);
if (status != EFI_SUCCESS)
goto free_tbl;
if (out)
*out = tbl;
return EFI_SUCCESS;
free_tbl:
efi_bs_call(free_pool, tbl);
free_initrd:
efi_free(initrd.size, initrd.base);
failed:
efi_err("Failed to load initrd: 0x%lx\n", status);
return status;
}
/**
* efi_wait_for_key() - Wait for key stroke
* @usec: number of microseconds to wait for key stroke
* @key: key entered
*
* Wait for up to @usec microseconds for a key stroke.
*
* Return: status code, EFI_SUCCESS if key received
*/
efi_status_t efi_wait_for_key(unsigned long usec, efi_input_key_t *key)
{
efi_event_t events[2], timer;
unsigned long index;
efi_simple_text_input_protocol_t *con_in;
efi_status_t status;
con_in = efi_table_attr(efi_system_table, con_in);
if (!con_in)
return EFI_UNSUPPORTED;
efi_set_event_at(events, 0, efi_table_attr(con_in, wait_for_key));
status = efi_bs_call(create_event, EFI_EVT_TIMER, 0, NULL, NULL, &timer);
if (status != EFI_SUCCESS)
return status;
status = efi_bs_call(set_timer, timer, EfiTimerRelative,
EFI_100NSEC_PER_USEC * usec);
if (status != EFI_SUCCESS)
return status;
efi_set_event_at(events, 1, timer);
status = efi_bs_call(wait_for_event, 2, events, &index);
if (status == EFI_SUCCESS) {
if (index == 0)
status = efi_call_proto(con_in, read_keystroke, key);
else
status = EFI_TIMEOUT;
}
efi_bs_call(close_event, timer);
return status;
}
/**
* efi_remap_image - Remap a loaded image with the appropriate permissions
* for code and data
*
* @image_base: the base of the image in memory
* @alloc_size: the size of the area in memory occupied by the image
* @code_size: the size of the leading part of the image containing code
* and read-only data
*
* efi_remap_image() uses the EFI memory attribute protocol to remap the code
* region of the loaded image read-only/executable, and the remainder
* read-write/non-executable. The code region is assumed to start at the base
* of the image, and will therefore cover the PE/COFF header as well.
*/
void efi_remap_image(unsigned long image_base, unsigned alloc_size,
unsigned long code_size)
{
efi_guid_t guid = EFI_MEMORY_ATTRIBUTE_PROTOCOL_GUID;
efi_memory_attribute_protocol_t *memattr;
efi_status_t status;
u64 attr;
/*
* If the firmware implements the EFI_MEMORY_ATTRIBUTE_PROTOCOL, let's
* invoke it to remap the text/rodata region of the decompressed image
* as read-only and the data/bss region as non-executable.
*/
status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&memattr);
if (status != EFI_SUCCESS)
return;
// Get the current attributes for the entire region
status = memattr->get_memory_attributes(memattr, image_base,
alloc_size, &attr);
if (status != EFI_SUCCESS) {
efi_warn("Failed to retrieve memory attributes for image region: 0x%lx\n",
status);
return;
}
// Mark the code region as read-only
status = memattr->set_memory_attributes(memattr, image_base, code_size,
EFI_MEMORY_RO);
if (status != EFI_SUCCESS) {
efi_warn("Failed to remap code region read-only\n");
return;
}
// If the entire region was already mapped as non-exec, clear the
// attribute from the code region. Otherwise, set it on the data
// region.
if (attr & EFI_MEMORY_XP) {
status = memattr->clear_memory_attributes(memattr, image_base,
code_size,
EFI_MEMORY_XP);
if (status != EFI_SUCCESS)
efi_warn("Failed to remap code region executable\n");
} else {
status = memattr->set_memory_attributes(memattr,
image_base + code_size,
alloc_size - code_size,
EFI_MEMORY_XP);
if (status != EFI_SUCCESS)
efi_warn("Failed to remap data region non-executable\n");
}
}
| linux-master | drivers/firmware/efi/libstub/efi-stub-helper.c |
// SPDX-License-Identifier: GPL-2.0
#include <linux/efi.h>
#include <asm/efi.h>
#include <asm/string.h>
#include "efistub.h"
#ifdef CONFIG_KASAN
#undef memcpy
#undef memmove
#undef memset
void *__memcpy(void *__dest, const void *__src, size_t __n) __alias(memcpy);
void *__memmove(void *__dest, const void *__src, size_t count) __alias(memmove);
void *__memset(void *s, int c, size_t count) __alias(memset);
#endif
void *memcpy(void *dst, const void *src, size_t len)
{
efi_bs_call(copy_mem, dst, src, len);
return dst;
}
extern void *memmove(void *dst, const void *src, size_t len) __alias(memcpy);
void *memset(void *dst, int c, size_t len)
{
efi_bs_call(set_mem, dst, len, c & U8_MAX);
return dst;
}
/**
* memcmp - Compare two areas of memory
* @cs: One area of memory
* @ct: Another area of memory
* @count: The size of the area.
*/
#undef memcmp
int memcmp(const void *cs, const void *ct, size_t count)
{
const unsigned char *su1, *su2;
int res = 0;
for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
if ((res = *su1 - *su2) != 0)
break;
return res;
}
| linux-master | drivers/firmware/efi/libstub/intrinsics.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* generic display timing functions
*
* Copyright (c) 2012 Steffen Trumtrar <[email protected]>, Pengutronix
*/
#include <linux/export.h>
#include <linux/slab.h>
#include <video/display_timing.h>
void display_timings_release(struct display_timings *disp)
{
if (disp->timings) {
unsigned int i;
for (i = 0; i < disp->num_timings; i++)
kfree(disp->timings[i]);
kfree(disp->timings);
}
kfree(disp);
}
EXPORT_SYMBOL_GPL(display_timings_release);
| linux-master | drivers/video/display_timing.c |
// SPDX-License-Identifier: GPL-2.0
#include <linux/module.h>
#include <linux/types.h>
#include <video/nomodeset.h>
static bool video_nomodeset;
bool video_firmware_drivers_only(void)
{
return video_nomodeset;
}
EXPORT_SYMBOL(video_firmware_drivers_only);
static int __init disable_modeset(char *str)
{
video_nomodeset = true;
pr_warn("Booted with the nomodeset parameter. Only the system framebuffer will be available\n");
return 1;
}
/* Disable kernel modesetting */
__setup("nomodeset", disable_modeset);
| linux-master | drivers/video/nomodeset.c |
/*
* Copyright (C) 2012 Avionic Design GmbH
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sub license,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <drm/display/drm_dp.h>
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/hdmi.h>
#include <linux/string.h>
#include <linux/device.h>
#define hdmi_log(fmt, ...) dev_printk(level, dev, fmt, ##__VA_ARGS__)
static u8 hdmi_infoframe_checksum(const u8 *ptr, size_t size)
{
u8 csum = 0;
size_t i;
/* compute checksum */
for (i = 0; i < size; i++)
csum += ptr[i];
return 256 - csum;
}
static void hdmi_infoframe_set_checksum(void *buffer, size_t size)
{
u8 *ptr = buffer;
ptr[3] = hdmi_infoframe_checksum(buffer, size);
}
/**
* hdmi_avi_infoframe_init() - initialize an HDMI AVI infoframe
* @frame: HDMI AVI infoframe
*/
void hdmi_avi_infoframe_init(struct hdmi_avi_infoframe *frame)
{
memset(frame, 0, sizeof(*frame));
frame->type = HDMI_INFOFRAME_TYPE_AVI;
frame->version = 2;
frame->length = HDMI_AVI_INFOFRAME_SIZE;
}
EXPORT_SYMBOL(hdmi_avi_infoframe_init);
static int hdmi_avi_infoframe_check_only(const struct hdmi_avi_infoframe *frame)
{
if (frame->type != HDMI_INFOFRAME_TYPE_AVI ||
frame->version != 2 ||
frame->length != HDMI_AVI_INFOFRAME_SIZE)
return -EINVAL;
if (frame->picture_aspect > HDMI_PICTURE_ASPECT_16_9)
return -EINVAL;
return 0;
}
/**
* hdmi_avi_infoframe_check() - check a HDMI AVI infoframe
* @frame: HDMI AVI infoframe
*
* Validates that the infoframe is consistent and updates derived fields
* (eg. length) based on other fields.
*
* Returns 0 on success or a negative error code on failure.
*/
int hdmi_avi_infoframe_check(struct hdmi_avi_infoframe *frame)
{
return hdmi_avi_infoframe_check_only(frame);
}
EXPORT_SYMBOL(hdmi_avi_infoframe_check);
/**
* hdmi_avi_infoframe_pack_only() - write HDMI AVI infoframe to binary buffer
* @frame: HDMI AVI infoframe
* @buffer: destination buffer
* @size: size of buffer
*
* Packs the information contained in the @frame structure into a binary
* representation that can be written into the corresponding controller
* registers. Also computes the checksum as required by section 5.3.5 of
* the HDMI 1.4 specification.
*
* Returns the number of bytes packed into the binary buffer or a negative
* error code on failure.
*/
ssize_t hdmi_avi_infoframe_pack_only(const struct hdmi_avi_infoframe *frame,
void *buffer, size_t size)
{
u8 *ptr = buffer;
size_t length;
int ret;
ret = hdmi_avi_infoframe_check_only(frame);
if (ret)
return ret;
length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
if (size < length)
return -ENOSPC;
memset(buffer, 0, size);
ptr[0] = frame->type;
ptr[1] = frame->version;
ptr[2] = frame->length;
ptr[3] = 0; /* checksum */
/* start infoframe payload */
ptr += HDMI_INFOFRAME_HEADER_SIZE;
ptr[0] = ((frame->colorspace & 0x3) << 5) | (frame->scan_mode & 0x3);
/*
* Data byte 1, bit 4 has to be set if we provide the active format
* aspect ratio
*/
if (frame->active_aspect & 0xf)
ptr[0] |= BIT(4);
/* Bit 3 and 2 indicate if we transmit horizontal/vertical bar data */
if (frame->top_bar || frame->bottom_bar)
ptr[0] |= BIT(3);
if (frame->left_bar || frame->right_bar)
ptr[0] |= BIT(2);
ptr[1] = ((frame->colorimetry & 0x3) << 6) |
((frame->picture_aspect & 0x3) << 4) |
(frame->active_aspect & 0xf);
ptr[2] = ((frame->extended_colorimetry & 0x7) << 4) |
((frame->quantization_range & 0x3) << 2) |
(frame->nups & 0x3);
if (frame->itc)
ptr[2] |= BIT(7);
ptr[3] = frame->video_code & 0x7f;
ptr[4] = ((frame->ycc_quantization_range & 0x3) << 6) |
((frame->content_type & 0x3) << 4) |
(frame->pixel_repeat & 0xf);
ptr[5] = frame->top_bar & 0xff;
ptr[6] = (frame->top_bar >> 8) & 0xff;
ptr[7] = frame->bottom_bar & 0xff;
ptr[8] = (frame->bottom_bar >> 8) & 0xff;
ptr[9] = frame->left_bar & 0xff;
ptr[10] = (frame->left_bar >> 8) & 0xff;
ptr[11] = frame->right_bar & 0xff;
ptr[12] = (frame->right_bar >> 8) & 0xff;
hdmi_infoframe_set_checksum(buffer, length);
return length;
}
EXPORT_SYMBOL(hdmi_avi_infoframe_pack_only);
/**
* hdmi_avi_infoframe_pack() - check a HDMI AVI infoframe,
* and write it to binary buffer
* @frame: HDMI AVI infoframe
* @buffer: destination buffer
* @size: size of buffer
*
* Validates that the infoframe is consistent and updates derived fields
* (eg. length) based on other fields, after which it packs the information
* contained in the @frame structure into a binary representation that
* can be written into the corresponding controller registers. This function
* also computes the checksum as required by section 5.3.5 of the HDMI 1.4
* specification.
*
* Returns the number of bytes packed into the binary buffer or a negative
* error code on failure.
*/
ssize_t hdmi_avi_infoframe_pack(struct hdmi_avi_infoframe *frame,
void *buffer, size_t size)
{
int ret;
ret = hdmi_avi_infoframe_check(frame);
if (ret)
return ret;
return hdmi_avi_infoframe_pack_only(frame, buffer, size);
}
EXPORT_SYMBOL(hdmi_avi_infoframe_pack);
/**
* hdmi_spd_infoframe_init() - initialize an HDMI SPD infoframe
* @frame: HDMI SPD infoframe
* @vendor: vendor string
* @product: product string
*
* Returns 0 on success or a negative error code on failure.
*/
int hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame,
const char *vendor, const char *product)
{
size_t len;
memset(frame, 0, sizeof(*frame));
frame->type = HDMI_INFOFRAME_TYPE_SPD;
frame->version = 1;
frame->length = HDMI_SPD_INFOFRAME_SIZE;
len = strlen(vendor);
memcpy(frame->vendor, vendor, min(len, sizeof(frame->vendor)));
len = strlen(product);
memcpy(frame->product, product, min(len, sizeof(frame->product)));
return 0;
}
EXPORT_SYMBOL(hdmi_spd_infoframe_init);
static int hdmi_spd_infoframe_check_only(const struct hdmi_spd_infoframe *frame)
{
if (frame->type != HDMI_INFOFRAME_TYPE_SPD ||
frame->version != 1 ||
frame->length != HDMI_SPD_INFOFRAME_SIZE)
return -EINVAL;
return 0;
}
/**
* hdmi_spd_infoframe_check() - check a HDMI SPD infoframe
* @frame: HDMI SPD infoframe
*
* Validates that the infoframe is consistent and updates derived fields
* (eg. length) based on other fields.
*
* Returns 0 on success or a negative error code on failure.
*/
int hdmi_spd_infoframe_check(struct hdmi_spd_infoframe *frame)
{
return hdmi_spd_infoframe_check_only(frame);
}
EXPORT_SYMBOL(hdmi_spd_infoframe_check);
/**
* hdmi_spd_infoframe_pack_only() - write HDMI SPD infoframe to binary buffer
* @frame: HDMI SPD infoframe
* @buffer: destination buffer
* @size: size of buffer
*
* Packs the information contained in the @frame structure into a binary
* representation that can be written into the corresponding controller
* registers. Also computes the checksum as required by section 5.3.5 of
* the HDMI 1.4 specification.
*
* Returns the number of bytes packed into the binary buffer or a negative
* error code on failure.
*/
ssize_t hdmi_spd_infoframe_pack_only(const struct hdmi_spd_infoframe *frame,
void *buffer, size_t size)
{
u8 *ptr = buffer;
size_t length;
int ret;
ret = hdmi_spd_infoframe_check_only(frame);
if (ret)
return ret;
length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
if (size < length)
return -ENOSPC;
memset(buffer, 0, size);
ptr[0] = frame->type;
ptr[1] = frame->version;
ptr[2] = frame->length;
ptr[3] = 0; /* checksum */
/* start infoframe payload */
ptr += HDMI_INFOFRAME_HEADER_SIZE;
memcpy(ptr, frame->vendor, sizeof(frame->vendor));
memcpy(ptr + 8, frame->product, sizeof(frame->product));
ptr[24] = frame->sdi;
hdmi_infoframe_set_checksum(buffer, length);
return length;
}
EXPORT_SYMBOL(hdmi_spd_infoframe_pack_only);
/**
* hdmi_spd_infoframe_pack() - check a HDMI SPD infoframe,
* and write it to binary buffer
* @frame: HDMI SPD infoframe
* @buffer: destination buffer
* @size: size of buffer
*
* Validates that the infoframe is consistent and updates derived fields
* (eg. length) based on other fields, after which it packs the information
* contained in the @frame structure into a binary representation that
* can be written into the corresponding controller registers. This function
* also computes the checksum as required by section 5.3.5 of the HDMI 1.4
* specification.
*
* Returns the number of bytes packed into the binary buffer or a negative
* error code on failure.
*/
ssize_t hdmi_spd_infoframe_pack(struct hdmi_spd_infoframe *frame,
void *buffer, size_t size)
{
int ret;
ret = hdmi_spd_infoframe_check(frame);
if (ret)
return ret;
return hdmi_spd_infoframe_pack_only(frame, buffer, size);
}
EXPORT_SYMBOL(hdmi_spd_infoframe_pack);
/**
* hdmi_audio_infoframe_init() - initialize an HDMI audio infoframe
* @frame: HDMI audio infoframe
*
* Returns 0 on success or a negative error code on failure.
*/
int hdmi_audio_infoframe_init(struct hdmi_audio_infoframe *frame)
{
memset(frame, 0, sizeof(*frame));
frame->type = HDMI_INFOFRAME_TYPE_AUDIO;
frame->version = 1;
frame->length = HDMI_AUDIO_INFOFRAME_SIZE;
return 0;
}
EXPORT_SYMBOL(hdmi_audio_infoframe_init);
static int hdmi_audio_infoframe_check_only(const struct hdmi_audio_infoframe *frame)
{
if (frame->type != HDMI_INFOFRAME_TYPE_AUDIO ||
frame->version != 1 ||
frame->length != HDMI_AUDIO_INFOFRAME_SIZE)
return -EINVAL;
return 0;
}
/**
* hdmi_audio_infoframe_check() - check a HDMI audio infoframe
* @frame: HDMI audio infoframe
*
* Validates that the infoframe is consistent and updates derived fields
* (eg. length) based on other fields.
*
* Returns 0 on success or a negative error code on failure.
*/
int hdmi_audio_infoframe_check(const struct hdmi_audio_infoframe *frame)
{
return hdmi_audio_infoframe_check_only(frame);
}
EXPORT_SYMBOL(hdmi_audio_infoframe_check);
static void
hdmi_audio_infoframe_pack_payload(const struct hdmi_audio_infoframe *frame,
u8 *buffer)
{
u8 channels;
if (frame->channels >= 2)
channels = frame->channels - 1;
else
channels = 0;
buffer[0] = ((frame->coding_type & 0xf) << 4) | (channels & 0x7);
buffer[1] = ((frame->sample_frequency & 0x7) << 2) |
(frame->sample_size & 0x3);
buffer[2] = frame->coding_type_ext & 0x1f;
buffer[3] = frame->channel_allocation;
buffer[4] = (frame->level_shift_value & 0xf) << 3;
if (frame->downmix_inhibit)
buffer[4] |= BIT(7);
}
/**
* hdmi_audio_infoframe_pack_only() - write HDMI audio infoframe to binary buffer
* @frame: HDMI audio infoframe
* @buffer: destination buffer
* @size: size of buffer
*
* Packs the information contained in the @frame structure into a binary
* representation that can be written into the corresponding controller
* registers. Also computes the checksum as required by section 5.3.5 of
* the HDMI 1.4 specification.
*
* Returns the number of bytes packed into the binary buffer or a negative
* error code on failure.
*/
ssize_t hdmi_audio_infoframe_pack_only(const struct hdmi_audio_infoframe *frame,
void *buffer, size_t size)
{
u8 *ptr = buffer;
size_t length;
int ret;
ret = hdmi_audio_infoframe_check_only(frame);
if (ret)
return ret;
length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
if (size < length)
return -ENOSPC;
memset(buffer, 0, size);
ptr[0] = frame->type;
ptr[1] = frame->version;
ptr[2] = frame->length;
ptr[3] = 0; /* checksum */
hdmi_audio_infoframe_pack_payload(frame,
ptr + HDMI_INFOFRAME_HEADER_SIZE);
hdmi_infoframe_set_checksum(buffer, length);
return length;
}
EXPORT_SYMBOL(hdmi_audio_infoframe_pack_only);
/**
* hdmi_audio_infoframe_pack() - check a HDMI Audio infoframe,
* and write it to binary buffer
* @frame: HDMI Audio infoframe
* @buffer: destination buffer
* @size: size of buffer
*
* Validates that the infoframe is consistent and updates derived fields
* (eg. length) based on other fields, after which it packs the information
* contained in the @frame structure into a binary representation that
* can be written into the corresponding controller registers. This function
* also computes the checksum as required by section 5.3.5 of the HDMI 1.4
* specification.
*
* Returns the number of bytes packed into the binary buffer or a negative
* error code on failure.
*/
ssize_t hdmi_audio_infoframe_pack(struct hdmi_audio_infoframe *frame,
void *buffer, size_t size)
{
int ret;
ret = hdmi_audio_infoframe_check(frame);
if (ret)
return ret;
return hdmi_audio_infoframe_pack_only(frame, buffer, size);
}
EXPORT_SYMBOL(hdmi_audio_infoframe_pack);
/**
* hdmi_audio_infoframe_pack_for_dp - Pack a HDMI Audio infoframe for DisplayPort
*
* @frame: HDMI Audio infoframe
* @sdp: Secondary data packet for DisplayPort.
* @dp_version: DisplayPort version to be encoded in the header
*
* Packs a HDMI Audio Infoframe to be sent over DisplayPort. This function
* fills the secondary data packet to be used for DisplayPort.
*
* Return: Number of total written bytes or a negative errno on failure.
*/
ssize_t
hdmi_audio_infoframe_pack_for_dp(const struct hdmi_audio_infoframe *frame,
struct dp_sdp *sdp, u8 dp_version)
{
int ret;
ret = hdmi_audio_infoframe_check(frame);
if (ret)
return ret;
memset(sdp->db, 0, sizeof(sdp->db));
/* Secondary-data packet header */
sdp->sdp_header.HB0 = 0;
sdp->sdp_header.HB1 = frame->type;
sdp->sdp_header.HB2 = DP_SDP_AUDIO_INFOFRAME_HB2;
sdp->sdp_header.HB3 = (dp_version & 0x3f) << 2;
hdmi_audio_infoframe_pack_payload(frame, sdp->db);
/* Return size = frame length + four HB for sdp_header */
return frame->length + 4;
}
EXPORT_SYMBOL(hdmi_audio_infoframe_pack_for_dp);
/**
* hdmi_vendor_infoframe_init() - initialize an HDMI vendor infoframe
* @frame: HDMI vendor infoframe
*
* Returns 0 on success or a negative error code on failure.
*/
int hdmi_vendor_infoframe_init(struct hdmi_vendor_infoframe *frame)
{
memset(frame, 0, sizeof(*frame));
frame->type = HDMI_INFOFRAME_TYPE_VENDOR;
frame->version = 1;
frame->oui = HDMI_IEEE_OUI;
/*
* 0 is a valid value for s3d_struct, so we use a special "not set"
* value
*/
frame->s3d_struct = HDMI_3D_STRUCTURE_INVALID;
frame->length = HDMI_VENDOR_INFOFRAME_SIZE;
return 0;
}
EXPORT_SYMBOL(hdmi_vendor_infoframe_init);
static int hdmi_vendor_infoframe_length(const struct hdmi_vendor_infoframe *frame)
{
/* for side by side (half) we also need to provide 3D_Ext_Data */
if (frame->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
return 6;
else if (frame->vic != 0 || frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID)
return 5;
else
return 4;
}
static int hdmi_vendor_infoframe_check_only(const struct hdmi_vendor_infoframe *frame)
{
if (frame->type != HDMI_INFOFRAME_TYPE_VENDOR ||
frame->version != 1 ||
frame->oui != HDMI_IEEE_OUI)
return -EINVAL;
/* only one of those can be supplied */
if (frame->vic != 0 && frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID)
return -EINVAL;
if (frame->length != hdmi_vendor_infoframe_length(frame))
return -EINVAL;
return 0;
}
/**
* hdmi_vendor_infoframe_check() - check a HDMI vendor infoframe
* @frame: HDMI infoframe
*
* Validates that the infoframe is consistent and updates derived fields
* (eg. length) based on other fields.
*
* Returns 0 on success or a negative error code on failure.
*/
int hdmi_vendor_infoframe_check(struct hdmi_vendor_infoframe *frame)
{
frame->length = hdmi_vendor_infoframe_length(frame);
return hdmi_vendor_infoframe_check_only(frame);
}
EXPORT_SYMBOL(hdmi_vendor_infoframe_check);
/**
* hdmi_vendor_infoframe_pack_only() - write a HDMI vendor infoframe to binary buffer
* @frame: HDMI infoframe
* @buffer: destination buffer
* @size: size of buffer
*
* Packs the information contained in the @frame structure into a binary
* representation that can be written into the corresponding controller
* registers. Also computes the checksum as required by section 5.3.5 of
* the HDMI 1.4 specification.
*
* Returns the number of bytes packed into the binary buffer or a negative
* error code on failure.
*/
ssize_t hdmi_vendor_infoframe_pack_only(const struct hdmi_vendor_infoframe *frame,
void *buffer, size_t size)
{
u8 *ptr = buffer;
size_t length;
int ret;
ret = hdmi_vendor_infoframe_check_only(frame);
if (ret)
return ret;
length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
if (size < length)
return -ENOSPC;
memset(buffer, 0, size);
ptr[0] = frame->type;
ptr[1] = frame->version;
ptr[2] = frame->length;
ptr[3] = 0; /* checksum */
/* HDMI OUI */
ptr[4] = 0x03;
ptr[5] = 0x0c;
ptr[6] = 0x00;
if (frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID) {
ptr[7] = 0x2 << 5; /* video format */
ptr[8] = (frame->s3d_struct & 0xf) << 4;
if (frame->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
ptr[9] = (frame->s3d_ext_data & 0xf) << 4;
} else if (frame->vic) {
ptr[7] = 0x1 << 5; /* video format */
ptr[8] = frame->vic;
} else {
ptr[7] = 0x0 << 5; /* video format */
}
hdmi_infoframe_set_checksum(buffer, length);
return length;
}
EXPORT_SYMBOL(hdmi_vendor_infoframe_pack_only);
/**
* hdmi_vendor_infoframe_pack() - check a HDMI Vendor infoframe,
* and write it to binary buffer
* @frame: HDMI Vendor infoframe
* @buffer: destination buffer
* @size: size of buffer
*
* Validates that the infoframe is consistent and updates derived fields
* (eg. length) based on other fields, after which it packs the information
* contained in the @frame structure into a binary representation that
* can be written into the corresponding controller registers. This function
* also computes the checksum as required by section 5.3.5 of the HDMI 1.4
* specification.
*
* Returns the number of bytes packed into the binary buffer or a negative
* error code on failure.
*/
ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
void *buffer, size_t size)
{
int ret;
ret = hdmi_vendor_infoframe_check(frame);
if (ret)
return ret;
return hdmi_vendor_infoframe_pack_only(frame, buffer, size);
}
EXPORT_SYMBOL(hdmi_vendor_infoframe_pack);
static int
hdmi_vendor_any_infoframe_check_only(const union hdmi_vendor_any_infoframe *frame)
{
if (frame->any.type != HDMI_INFOFRAME_TYPE_VENDOR ||
frame->any.version != 1)
return -EINVAL;
return 0;
}
/**
* hdmi_drm_infoframe_init() - initialize an HDMI Dynaminc Range and
* mastering infoframe
* @frame: HDMI DRM infoframe
*
* Returns 0 on success or a negative error code on failure.
*/
int hdmi_drm_infoframe_init(struct hdmi_drm_infoframe *frame)
{
memset(frame, 0, sizeof(*frame));
frame->type = HDMI_INFOFRAME_TYPE_DRM;
frame->version = 1;
frame->length = HDMI_DRM_INFOFRAME_SIZE;
return 0;
}
EXPORT_SYMBOL(hdmi_drm_infoframe_init);
static int hdmi_drm_infoframe_check_only(const struct hdmi_drm_infoframe *frame)
{
if (frame->type != HDMI_INFOFRAME_TYPE_DRM ||
frame->version != 1)
return -EINVAL;
if (frame->length != HDMI_DRM_INFOFRAME_SIZE)
return -EINVAL;
return 0;
}
/**
* hdmi_drm_infoframe_check() - check a HDMI DRM infoframe
* @frame: HDMI DRM infoframe
*
* Validates that the infoframe is consistent.
* Returns 0 on success or a negative error code on failure.
*/
int hdmi_drm_infoframe_check(struct hdmi_drm_infoframe *frame)
{
return hdmi_drm_infoframe_check_only(frame);
}
EXPORT_SYMBOL(hdmi_drm_infoframe_check);
/**
* hdmi_drm_infoframe_pack_only() - write HDMI DRM infoframe to binary buffer
* @frame: HDMI DRM infoframe
* @buffer: destination buffer
* @size: size of buffer
*
* Packs the information contained in the @frame structure into a binary
* representation that can be written into the corresponding controller
* registers. Also computes the checksum as required by section 5.3.5 of
* the HDMI 1.4 specification.
*
* Returns the number of bytes packed into the binary buffer or a negative
* error code on failure.
*/
ssize_t hdmi_drm_infoframe_pack_only(const struct hdmi_drm_infoframe *frame,
void *buffer, size_t size)
{
u8 *ptr = buffer;
size_t length;
int i;
length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
if (size < length)
return -ENOSPC;
memset(buffer, 0, size);
ptr[0] = frame->type;
ptr[1] = frame->version;
ptr[2] = frame->length;
ptr[3] = 0; /* checksum */
/* start infoframe payload */
ptr += HDMI_INFOFRAME_HEADER_SIZE;
*ptr++ = frame->eotf;
*ptr++ = frame->metadata_type;
for (i = 0; i < 3; i++) {
*ptr++ = frame->display_primaries[i].x;
*ptr++ = frame->display_primaries[i].x >> 8;
*ptr++ = frame->display_primaries[i].y;
*ptr++ = frame->display_primaries[i].y >> 8;
}
*ptr++ = frame->white_point.x;
*ptr++ = frame->white_point.x >> 8;
*ptr++ = frame->white_point.y;
*ptr++ = frame->white_point.y >> 8;
*ptr++ = frame->max_display_mastering_luminance;
*ptr++ = frame->max_display_mastering_luminance >> 8;
*ptr++ = frame->min_display_mastering_luminance;
*ptr++ = frame->min_display_mastering_luminance >> 8;
*ptr++ = frame->max_cll;
*ptr++ = frame->max_cll >> 8;
*ptr++ = frame->max_fall;
*ptr++ = frame->max_fall >> 8;
hdmi_infoframe_set_checksum(buffer, length);
return length;
}
EXPORT_SYMBOL(hdmi_drm_infoframe_pack_only);
/**
* hdmi_drm_infoframe_pack() - check a HDMI DRM infoframe,
* and write it to binary buffer
* @frame: HDMI DRM infoframe
* @buffer: destination buffer
* @size: size of buffer
*
* Validates that the infoframe is consistent and updates derived fields
* (eg. length) based on other fields, after which it packs the information
* contained in the @frame structure into a binary representation that
* can be written into the corresponding controller registers. This function
* also computes the checksum as required by section 5.3.5 of the HDMI 1.4
* specification.
*
* Returns the number of bytes packed into the binary buffer or a negative
* error code on failure.
*/
ssize_t hdmi_drm_infoframe_pack(struct hdmi_drm_infoframe *frame,
void *buffer, size_t size)
{
int ret;
ret = hdmi_drm_infoframe_check(frame);
if (ret)
return ret;
return hdmi_drm_infoframe_pack_only(frame, buffer, size);
}
EXPORT_SYMBOL(hdmi_drm_infoframe_pack);
/*
* hdmi_vendor_any_infoframe_check() - check a vendor infoframe
*/
static int
hdmi_vendor_any_infoframe_check(union hdmi_vendor_any_infoframe *frame)
{
int ret;
ret = hdmi_vendor_any_infoframe_check_only(frame);
if (ret)
return ret;
/* we only know about HDMI vendor infoframes */
if (frame->any.oui != HDMI_IEEE_OUI)
return -EINVAL;
return hdmi_vendor_infoframe_check(&frame->hdmi);
}
/*
* hdmi_vendor_any_infoframe_pack_only() - write a vendor infoframe to binary buffer
*/
static ssize_t
hdmi_vendor_any_infoframe_pack_only(const union hdmi_vendor_any_infoframe *frame,
void *buffer, size_t size)
{
int ret;
ret = hdmi_vendor_any_infoframe_check_only(frame);
if (ret)
return ret;
/* we only know about HDMI vendor infoframes */
if (frame->any.oui != HDMI_IEEE_OUI)
return -EINVAL;
return hdmi_vendor_infoframe_pack_only(&frame->hdmi, buffer, size);
}
/*
* hdmi_vendor_any_infoframe_pack() - check a vendor infoframe,
* and write it to binary buffer
*/
static ssize_t
hdmi_vendor_any_infoframe_pack(union hdmi_vendor_any_infoframe *frame,
void *buffer, size_t size)
{
int ret;
ret = hdmi_vendor_any_infoframe_check(frame);
if (ret)
return ret;
return hdmi_vendor_any_infoframe_pack_only(frame, buffer, size);
}
/**
* hdmi_infoframe_check() - check a HDMI infoframe
* @frame: HDMI infoframe
*
* Validates that the infoframe is consistent and updates derived fields
* (eg. length) based on other fields.
*
* Returns 0 on success or a negative error code on failure.
*/
int
hdmi_infoframe_check(union hdmi_infoframe *frame)
{
switch (frame->any.type) {
case HDMI_INFOFRAME_TYPE_AVI:
return hdmi_avi_infoframe_check(&frame->avi);
case HDMI_INFOFRAME_TYPE_SPD:
return hdmi_spd_infoframe_check(&frame->spd);
case HDMI_INFOFRAME_TYPE_AUDIO:
return hdmi_audio_infoframe_check(&frame->audio);
case HDMI_INFOFRAME_TYPE_VENDOR:
return hdmi_vendor_any_infoframe_check(&frame->vendor);
default:
WARN(1, "Bad infoframe type %d\n", frame->any.type);
return -EINVAL;
}
}
EXPORT_SYMBOL(hdmi_infoframe_check);
/**
* hdmi_infoframe_pack_only() - write a HDMI infoframe to binary buffer
* @frame: HDMI infoframe
* @buffer: destination buffer
* @size: size of buffer
*
* Packs the information contained in the @frame structure into a binary
* representation that can be written into the corresponding controller
* registers. Also computes the checksum as required by section 5.3.5 of
* the HDMI 1.4 specification.
*
* Returns the number of bytes packed into the binary buffer or a negative
* error code on failure.
*/
ssize_t
hdmi_infoframe_pack_only(const union hdmi_infoframe *frame, void *buffer, size_t size)
{
ssize_t length;
switch (frame->any.type) {
case HDMI_INFOFRAME_TYPE_AVI:
length = hdmi_avi_infoframe_pack_only(&frame->avi,
buffer, size);
break;
case HDMI_INFOFRAME_TYPE_DRM:
length = hdmi_drm_infoframe_pack_only(&frame->drm,
buffer, size);
break;
case HDMI_INFOFRAME_TYPE_SPD:
length = hdmi_spd_infoframe_pack_only(&frame->spd,
buffer, size);
break;
case HDMI_INFOFRAME_TYPE_AUDIO:
length = hdmi_audio_infoframe_pack_only(&frame->audio,
buffer, size);
break;
case HDMI_INFOFRAME_TYPE_VENDOR:
length = hdmi_vendor_any_infoframe_pack_only(&frame->vendor,
buffer, size);
break;
default:
WARN(1, "Bad infoframe type %d\n", frame->any.type);
length = -EINVAL;
}
return length;
}
EXPORT_SYMBOL(hdmi_infoframe_pack_only);
/**
* hdmi_infoframe_pack() - check a HDMI infoframe,
* and write it to binary buffer
* @frame: HDMI infoframe
* @buffer: destination buffer
* @size: size of buffer
*
* Validates that the infoframe is consistent and updates derived fields
* (eg. length) based on other fields, after which it packs the information
* contained in the @frame structure into a binary representation that
* can be written into the corresponding controller registers. This function
* also computes the checksum as required by section 5.3.5 of the HDMI 1.4
* specification.
*
* Returns the number of bytes packed into the binary buffer or a negative
* error code on failure.
*/
ssize_t
hdmi_infoframe_pack(union hdmi_infoframe *frame,
void *buffer, size_t size)
{
ssize_t length;
switch (frame->any.type) {
case HDMI_INFOFRAME_TYPE_AVI:
length = hdmi_avi_infoframe_pack(&frame->avi, buffer, size);
break;
case HDMI_INFOFRAME_TYPE_DRM:
length = hdmi_drm_infoframe_pack(&frame->drm, buffer, size);
break;
case HDMI_INFOFRAME_TYPE_SPD:
length = hdmi_spd_infoframe_pack(&frame->spd, buffer, size);
break;
case HDMI_INFOFRAME_TYPE_AUDIO:
length = hdmi_audio_infoframe_pack(&frame->audio, buffer, size);
break;
case HDMI_INFOFRAME_TYPE_VENDOR:
length = hdmi_vendor_any_infoframe_pack(&frame->vendor,
buffer, size);
break;
default:
WARN(1, "Bad infoframe type %d\n", frame->any.type);
length = -EINVAL;
}
return length;
}
EXPORT_SYMBOL(hdmi_infoframe_pack);
static const char *hdmi_infoframe_type_get_name(enum hdmi_infoframe_type type)
{
if (type < 0x80 || type > 0x9f)
return "Invalid";
switch (type) {
case HDMI_INFOFRAME_TYPE_VENDOR:
return "Vendor";
case HDMI_INFOFRAME_TYPE_AVI:
return "Auxiliary Video Information (AVI)";
case HDMI_INFOFRAME_TYPE_SPD:
return "Source Product Description (SPD)";
case HDMI_INFOFRAME_TYPE_AUDIO:
return "Audio";
case HDMI_INFOFRAME_TYPE_DRM:
return "Dynamic Range and Mastering";
}
return "Reserved";
}
static void hdmi_infoframe_log_header(const char *level,
struct device *dev,
const struct hdmi_any_infoframe *frame)
{
hdmi_log("HDMI infoframe: %s, version %u, length %u\n",
hdmi_infoframe_type_get_name(frame->type),
frame->version, frame->length);
}
static const char *hdmi_colorspace_get_name(enum hdmi_colorspace colorspace)
{
switch (colorspace) {
case HDMI_COLORSPACE_RGB:
return "RGB";
case HDMI_COLORSPACE_YUV422:
return "YCbCr 4:2:2";
case HDMI_COLORSPACE_YUV444:
return "YCbCr 4:4:4";
case HDMI_COLORSPACE_YUV420:
return "YCbCr 4:2:0";
case HDMI_COLORSPACE_RESERVED4:
return "Reserved (4)";
case HDMI_COLORSPACE_RESERVED5:
return "Reserved (5)";
case HDMI_COLORSPACE_RESERVED6:
return "Reserved (6)";
case HDMI_COLORSPACE_IDO_DEFINED:
return "IDO Defined";
}
return "Invalid";
}
static const char *hdmi_scan_mode_get_name(enum hdmi_scan_mode scan_mode)
{
switch (scan_mode) {
case HDMI_SCAN_MODE_NONE:
return "No Data";
case HDMI_SCAN_MODE_OVERSCAN:
return "Overscan";
case HDMI_SCAN_MODE_UNDERSCAN:
return "Underscan";
case HDMI_SCAN_MODE_RESERVED:
return "Reserved";
}
return "Invalid";
}
static const char *hdmi_colorimetry_get_name(enum hdmi_colorimetry colorimetry)
{
switch (colorimetry) {
case HDMI_COLORIMETRY_NONE:
return "No Data";
case HDMI_COLORIMETRY_ITU_601:
return "ITU601";
case HDMI_COLORIMETRY_ITU_709:
return "ITU709";
case HDMI_COLORIMETRY_EXTENDED:
return "Extended";
}
return "Invalid";
}
static const char *
hdmi_picture_aspect_get_name(enum hdmi_picture_aspect picture_aspect)
{
switch (picture_aspect) {
case HDMI_PICTURE_ASPECT_NONE:
return "No Data";
case HDMI_PICTURE_ASPECT_4_3:
return "4:3";
case HDMI_PICTURE_ASPECT_16_9:
return "16:9";
case HDMI_PICTURE_ASPECT_64_27:
return "64:27";
case HDMI_PICTURE_ASPECT_256_135:
return "256:135";
case HDMI_PICTURE_ASPECT_RESERVED:
return "Reserved";
}
return "Invalid";
}
static const char *
hdmi_active_aspect_get_name(enum hdmi_active_aspect active_aspect)
{
if (active_aspect < 0 || active_aspect > 0xf)
return "Invalid";
switch (active_aspect) {
case HDMI_ACTIVE_ASPECT_16_9_TOP:
return "16:9 Top";
case HDMI_ACTIVE_ASPECT_14_9_TOP:
return "14:9 Top";
case HDMI_ACTIVE_ASPECT_16_9_CENTER:
return "16:9 Center";
case HDMI_ACTIVE_ASPECT_PICTURE:
return "Same as Picture";
case HDMI_ACTIVE_ASPECT_4_3:
return "4:3";
case HDMI_ACTIVE_ASPECT_16_9:
return "16:9";
case HDMI_ACTIVE_ASPECT_14_9:
return "14:9";
case HDMI_ACTIVE_ASPECT_4_3_SP_14_9:
return "4:3 SP 14:9";
case HDMI_ACTIVE_ASPECT_16_9_SP_14_9:
return "16:9 SP 14:9";
case HDMI_ACTIVE_ASPECT_16_9_SP_4_3:
return "16:9 SP 4:3";
}
return "Reserved";
}
static const char *
hdmi_extended_colorimetry_get_name(enum hdmi_extended_colorimetry ext_col)
{
switch (ext_col) {
case HDMI_EXTENDED_COLORIMETRY_XV_YCC_601:
return "xvYCC 601";
case HDMI_EXTENDED_COLORIMETRY_XV_YCC_709:
return "xvYCC 709";
case HDMI_EXTENDED_COLORIMETRY_S_YCC_601:
return "sYCC 601";
case HDMI_EXTENDED_COLORIMETRY_OPYCC_601:
return "opYCC 601";
case HDMI_EXTENDED_COLORIMETRY_OPRGB:
return "opRGB";
case HDMI_EXTENDED_COLORIMETRY_BT2020_CONST_LUM:
return "BT.2020 Constant Luminance";
case HDMI_EXTENDED_COLORIMETRY_BT2020:
return "BT.2020";
case HDMI_EXTENDED_COLORIMETRY_RESERVED:
return "Reserved";
}
return "Invalid";
}
static const char *
hdmi_quantization_range_get_name(enum hdmi_quantization_range qrange)
{
switch (qrange) {
case HDMI_QUANTIZATION_RANGE_DEFAULT:
return "Default";
case HDMI_QUANTIZATION_RANGE_LIMITED:
return "Limited";
case HDMI_QUANTIZATION_RANGE_FULL:
return "Full";
case HDMI_QUANTIZATION_RANGE_RESERVED:
return "Reserved";
}
return "Invalid";
}
static const char *hdmi_nups_get_name(enum hdmi_nups nups)
{
switch (nups) {
case HDMI_NUPS_UNKNOWN:
return "Unknown Non-uniform Scaling";
case HDMI_NUPS_HORIZONTAL:
return "Horizontally Scaled";
case HDMI_NUPS_VERTICAL:
return "Vertically Scaled";
case HDMI_NUPS_BOTH:
return "Horizontally and Vertically Scaled";
}
return "Invalid";
}
static const char *
hdmi_ycc_quantization_range_get_name(enum hdmi_ycc_quantization_range qrange)
{
switch (qrange) {
case HDMI_YCC_QUANTIZATION_RANGE_LIMITED:
return "Limited";
case HDMI_YCC_QUANTIZATION_RANGE_FULL:
return "Full";
}
return "Invalid";
}
static const char *
hdmi_content_type_get_name(enum hdmi_content_type content_type)
{
switch (content_type) {
case HDMI_CONTENT_TYPE_GRAPHICS:
return "Graphics";
case HDMI_CONTENT_TYPE_PHOTO:
return "Photo";
case HDMI_CONTENT_TYPE_CINEMA:
return "Cinema";
case HDMI_CONTENT_TYPE_GAME:
return "Game";
}
return "Invalid";
}
static void hdmi_avi_infoframe_log(const char *level,
struct device *dev,
const struct hdmi_avi_infoframe *frame)
{
hdmi_infoframe_log_header(level, dev,
(const struct hdmi_any_infoframe *)frame);
hdmi_log(" colorspace: %s\n",
hdmi_colorspace_get_name(frame->colorspace));
hdmi_log(" scan mode: %s\n",
hdmi_scan_mode_get_name(frame->scan_mode));
hdmi_log(" colorimetry: %s\n",
hdmi_colorimetry_get_name(frame->colorimetry));
hdmi_log(" picture aspect: %s\n",
hdmi_picture_aspect_get_name(frame->picture_aspect));
hdmi_log(" active aspect: %s\n",
hdmi_active_aspect_get_name(frame->active_aspect));
hdmi_log(" itc: %s\n", frame->itc ? "IT Content" : "No Data");
hdmi_log(" extended colorimetry: %s\n",
hdmi_extended_colorimetry_get_name(frame->extended_colorimetry));
hdmi_log(" quantization range: %s\n",
hdmi_quantization_range_get_name(frame->quantization_range));
hdmi_log(" nups: %s\n", hdmi_nups_get_name(frame->nups));
hdmi_log(" video code: %u\n", frame->video_code);
hdmi_log(" ycc quantization range: %s\n",
hdmi_ycc_quantization_range_get_name(frame->ycc_quantization_range));
hdmi_log(" hdmi content type: %s\n",
hdmi_content_type_get_name(frame->content_type));
hdmi_log(" pixel repeat: %u\n", frame->pixel_repeat);
hdmi_log(" bar top %u, bottom %u, left %u, right %u\n",
frame->top_bar, frame->bottom_bar,
frame->left_bar, frame->right_bar);
}
static const char *hdmi_spd_sdi_get_name(enum hdmi_spd_sdi sdi)
{
if (sdi < 0 || sdi > 0xff)
return "Invalid";
switch (sdi) {
case HDMI_SPD_SDI_UNKNOWN:
return "Unknown";
case HDMI_SPD_SDI_DSTB:
return "Digital STB";
case HDMI_SPD_SDI_DVDP:
return "DVD Player";
case HDMI_SPD_SDI_DVHS:
return "D-VHS";
case HDMI_SPD_SDI_HDDVR:
return "HDD Videorecorder";
case HDMI_SPD_SDI_DVC:
return "DVC";
case HDMI_SPD_SDI_DSC:
return "DSC";
case HDMI_SPD_SDI_VCD:
return "Video CD";
case HDMI_SPD_SDI_GAME:
return "Game";
case HDMI_SPD_SDI_PC:
return "PC General";
case HDMI_SPD_SDI_BD:
return "Blu-Ray Disc (BD)";
case HDMI_SPD_SDI_SACD:
return "Super Audio CD";
case HDMI_SPD_SDI_HDDVD:
return "HD DVD";
case HDMI_SPD_SDI_PMP:
return "PMP";
}
return "Reserved";
}
static void hdmi_spd_infoframe_log(const char *level,
struct device *dev,
const struct hdmi_spd_infoframe *frame)
{
u8 buf[17];
hdmi_infoframe_log_header(level, dev,
(const struct hdmi_any_infoframe *)frame);
memset(buf, 0, sizeof(buf));
strncpy(buf, frame->vendor, 8);
hdmi_log(" vendor: %s\n", buf);
strncpy(buf, frame->product, 16);
hdmi_log(" product: %s\n", buf);
hdmi_log(" source device information: %s (0x%x)\n",
hdmi_spd_sdi_get_name(frame->sdi), frame->sdi);
}
static const char *
hdmi_audio_coding_type_get_name(enum hdmi_audio_coding_type coding_type)
{
switch (coding_type) {
case HDMI_AUDIO_CODING_TYPE_STREAM:
return "Refer to Stream Header";
case HDMI_AUDIO_CODING_TYPE_PCM:
return "PCM";
case HDMI_AUDIO_CODING_TYPE_AC3:
return "AC-3";
case HDMI_AUDIO_CODING_TYPE_MPEG1:
return "MPEG1";
case HDMI_AUDIO_CODING_TYPE_MP3:
return "MP3";
case HDMI_AUDIO_CODING_TYPE_MPEG2:
return "MPEG2";
case HDMI_AUDIO_CODING_TYPE_AAC_LC:
return "AAC";
case HDMI_AUDIO_CODING_TYPE_DTS:
return "DTS";
case HDMI_AUDIO_CODING_TYPE_ATRAC:
return "ATRAC";
case HDMI_AUDIO_CODING_TYPE_DSD:
return "One Bit Audio";
case HDMI_AUDIO_CODING_TYPE_EAC3:
return "Dolby Digital +";
case HDMI_AUDIO_CODING_TYPE_DTS_HD:
return "DTS-HD";
case HDMI_AUDIO_CODING_TYPE_MLP:
return "MAT (MLP)";
case HDMI_AUDIO_CODING_TYPE_DST:
return "DST";
case HDMI_AUDIO_CODING_TYPE_WMA_PRO:
return "WMA PRO";
case HDMI_AUDIO_CODING_TYPE_CXT:
return "Refer to CXT";
}
return "Invalid";
}
static const char *
hdmi_audio_sample_size_get_name(enum hdmi_audio_sample_size sample_size)
{
switch (sample_size) {
case HDMI_AUDIO_SAMPLE_SIZE_STREAM:
return "Refer to Stream Header";
case HDMI_AUDIO_SAMPLE_SIZE_16:
return "16 bit";
case HDMI_AUDIO_SAMPLE_SIZE_20:
return "20 bit";
case HDMI_AUDIO_SAMPLE_SIZE_24:
return "24 bit";
}
return "Invalid";
}
static const char *
hdmi_audio_sample_frequency_get_name(enum hdmi_audio_sample_frequency freq)
{
switch (freq) {
case HDMI_AUDIO_SAMPLE_FREQUENCY_STREAM:
return "Refer to Stream Header";
case HDMI_AUDIO_SAMPLE_FREQUENCY_32000:
return "32 kHz";
case HDMI_AUDIO_SAMPLE_FREQUENCY_44100:
return "44.1 kHz (CD)";
case HDMI_AUDIO_SAMPLE_FREQUENCY_48000:
return "48 kHz";
case HDMI_AUDIO_SAMPLE_FREQUENCY_88200:
return "88.2 kHz";
case HDMI_AUDIO_SAMPLE_FREQUENCY_96000:
return "96 kHz";
case HDMI_AUDIO_SAMPLE_FREQUENCY_176400:
return "176.4 kHz";
case HDMI_AUDIO_SAMPLE_FREQUENCY_192000:
return "192 kHz";
}
return "Invalid";
}
static const char *
hdmi_audio_coding_type_ext_get_name(enum hdmi_audio_coding_type_ext ctx)
{
if (ctx < 0 || ctx > 0x1f)
return "Invalid";
switch (ctx) {
case HDMI_AUDIO_CODING_TYPE_EXT_CT:
return "Refer to CT";
case HDMI_AUDIO_CODING_TYPE_EXT_HE_AAC:
return "HE AAC";
case HDMI_AUDIO_CODING_TYPE_EXT_HE_AAC_V2:
return "HE AAC v2";
case HDMI_AUDIO_CODING_TYPE_EXT_MPEG_SURROUND:
return "MPEG SURROUND";
case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_HE_AAC:
return "MPEG-4 HE AAC";
case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_HE_AAC_V2:
return "MPEG-4 HE AAC v2";
case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_AAC_LC:
return "MPEG-4 AAC LC";
case HDMI_AUDIO_CODING_TYPE_EXT_DRA:
return "DRA";
case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_HE_AAC_SURROUND:
return "MPEG-4 HE AAC + MPEG Surround";
case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_AAC_LC_SURROUND:
return "MPEG-4 AAC LC + MPEG Surround";
}
return "Reserved";
}
static void hdmi_audio_infoframe_log(const char *level,
struct device *dev,
const struct hdmi_audio_infoframe *frame)
{
hdmi_infoframe_log_header(level, dev,
(const struct hdmi_any_infoframe *)frame);
if (frame->channels)
hdmi_log(" channels: %u\n", frame->channels - 1);
else
hdmi_log(" channels: Refer to stream header\n");
hdmi_log(" coding type: %s\n",
hdmi_audio_coding_type_get_name(frame->coding_type));
hdmi_log(" sample size: %s\n",
hdmi_audio_sample_size_get_name(frame->sample_size));
hdmi_log(" sample frequency: %s\n",
hdmi_audio_sample_frequency_get_name(frame->sample_frequency));
hdmi_log(" coding type ext: %s\n",
hdmi_audio_coding_type_ext_get_name(frame->coding_type_ext));
hdmi_log(" channel allocation: 0x%x\n",
frame->channel_allocation);
hdmi_log(" level shift value: %u dB\n",
frame->level_shift_value);
hdmi_log(" downmix inhibit: %s\n",
frame->downmix_inhibit ? "Yes" : "No");
}
static void hdmi_drm_infoframe_log(const char *level,
struct device *dev,
const struct hdmi_drm_infoframe *frame)
{
int i;
hdmi_infoframe_log_header(level, dev,
(struct hdmi_any_infoframe *)frame);
hdmi_log("length: %d\n", frame->length);
hdmi_log("metadata type: %d\n", frame->metadata_type);
hdmi_log("eotf: %d\n", frame->eotf);
for (i = 0; i < 3; i++) {
hdmi_log("x[%d]: %d\n", i, frame->display_primaries[i].x);
hdmi_log("y[%d]: %d\n", i, frame->display_primaries[i].y);
}
hdmi_log("white point x: %d\n", frame->white_point.x);
hdmi_log("white point y: %d\n", frame->white_point.y);
hdmi_log("max_display_mastering_luminance: %d\n",
frame->max_display_mastering_luminance);
hdmi_log("min_display_mastering_luminance: %d\n",
frame->min_display_mastering_luminance);
hdmi_log("max_cll: %d\n", frame->max_cll);
hdmi_log("max_fall: %d\n", frame->max_fall);
}
static const char *
hdmi_3d_structure_get_name(enum hdmi_3d_structure s3d_struct)
{
if (s3d_struct < 0 || s3d_struct > 0xf)
return "Invalid";
switch (s3d_struct) {
case HDMI_3D_STRUCTURE_FRAME_PACKING:
return "Frame Packing";
case HDMI_3D_STRUCTURE_FIELD_ALTERNATIVE:
return "Field Alternative";
case HDMI_3D_STRUCTURE_LINE_ALTERNATIVE:
return "Line Alternative";
case HDMI_3D_STRUCTURE_SIDE_BY_SIDE_FULL:
return "Side-by-side (Full)";
case HDMI_3D_STRUCTURE_L_DEPTH:
return "L + Depth";
case HDMI_3D_STRUCTURE_L_DEPTH_GFX_GFX_DEPTH:
return "L + Depth + Graphics + Graphics-depth";
case HDMI_3D_STRUCTURE_TOP_AND_BOTTOM:
return "Top-and-Bottom";
case HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF:
return "Side-by-side (Half)";
default:
break;
}
return "Reserved";
}
static void
hdmi_vendor_any_infoframe_log(const char *level,
struct device *dev,
const union hdmi_vendor_any_infoframe *frame)
{
const struct hdmi_vendor_infoframe *hvf = &frame->hdmi;
hdmi_infoframe_log_header(level, dev,
(const struct hdmi_any_infoframe *)frame);
if (frame->any.oui != HDMI_IEEE_OUI) {
hdmi_log(" not a HDMI vendor infoframe\n");
return;
}
if (hvf->vic == 0 && hvf->s3d_struct == HDMI_3D_STRUCTURE_INVALID) {
hdmi_log(" empty frame\n");
return;
}
if (hvf->vic)
hdmi_log(" HDMI VIC: %u\n", hvf->vic);
if (hvf->s3d_struct != HDMI_3D_STRUCTURE_INVALID) {
hdmi_log(" 3D structure: %s\n",
hdmi_3d_structure_get_name(hvf->s3d_struct));
if (hvf->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
hdmi_log(" 3D extension data: %d\n",
hvf->s3d_ext_data);
}
}
/**
* hdmi_infoframe_log() - log info of HDMI infoframe
* @level: logging level
* @dev: device
* @frame: HDMI infoframe
*/
void hdmi_infoframe_log(const char *level,
struct device *dev,
const union hdmi_infoframe *frame)
{
switch (frame->any.type) {
case HDMI_INFOFRAME_TYPE_AVI:
hdmi_avi_infoframe_log(level, dev, &frame->avi);
break;
case HDMI_INFOFRAME_TYPE_SPD:
hdmi_spd_infoframe_log(level, dev, &frame->spd);
break;
case HDMI_INFOFRAME_TYPE_AUDIO:
hdmi_audio_infoframe_log(level, dev, &frame->audio);
break;
case HDMI_INFOFRAME_TYPE_VENDOR:
hdmi_vendor_any_infoframe_log(level, dev, &frame->vendor);
break;
case HDMI_INFOFRAME_TYPE_DRM:
hdmi_drm_infoframe_log(level, dev, &frame->drm);
break;
}
}
EXPORT_SYMBOL(hdmi_infoframe_log);
/**
* hdmi_avi_infoframe_unpack() - unpack binary buffer to a HDMI AVI infoframe
* @frame: HDMI AVI infoframe
* @buffer: source buffer
* @size: size of buffer
*
* Unpacks the information contained in binary @buffer into a structured
* @frame of the HDMI Auxiliary Video (AVI) information frame.
* Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
* specification.
*
* Returns 0 on success or a negative error code on failure.
*/
static int hdmi_avi_infoframe_unpack(struct hdmi_avi_infoframe *frame,
const void *buffer, size_t size)
{
const u8 *ptr = buffer;
if (size < HDMI_INFOFRAME_SIZE(AVI))
return -EINVAL;
if (ptr[0] != HDMI_INFOFRAME_TYPE_AVI ||
ptr[1] != 2 ||
ptr[2] != HDMI_AVI_INFOFRAME_SIZE)
return -EINVAL;
if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(AVI)) != 0)
return -EINVAL;
hdmi_avi_infoframe_init(frame);
ptr += HDMI_INFOFRAME_HEADER_SIZE;
frame->colorspace = (ptr[0] >> 5) & 0x3;
if (ptr[0] & 0x10)
frame->active_aspect = ptr[1] & 0xf;
if (ptr[0] & 0x8) {
frame->top_bar = (ptr[6] << 8) | ptr[5];
frame->bottom_bar = (ptr[8] << 8) | ptr[7];
}
if (ptr[0] & 0x4) {
frame->left_bar = (ptr[10] << 8) | ptr[9];
frame->right_bar = (ptr[12] << 8) | ptr[11];
}
frame->scan_mode = ptr[0] & 0x3;
frame->colorimetry = (ptr[1] >> 6) & 0x3;
frame->picture_aspect = (ptr[1] >> 4) & 0x3;
frame->active_aspect = ptr[1] & 0xf;
frame->itc = ptr[2] & 0x80 ? true : false;
frame->extended_colorimetry = (ptr[2] >> 4) & 0x7;
frame->quantization_range = (ptr[2] >> 2) & 0x3;
frame->nups = ptr[2] & 0x3;
frame->video_code = ptr[3] & 0x7f;
frame->ycc_quantization_range = (ptr[4] >> 6) & 0x3;
frame->content_type = (ptr[4] >> 4) & 0x3;
frame->pixel_repeat = ptr[4] & 0xf;
return 0;
}
/**
* hdmi_spd_infoframe_unpack() - unpack binary buffer to a HDMI SPD infoframe
* @frame: HDMI SPD infoframe
* @buffer: source buffer
* @size: size of buffer
*
* Unpacks the information contained in binary @buffer into a structured
* @frame of the HDMI Source Product Description (SPD) information frame.
* Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
* specification.
*
* Returns 0 on success or a negative error code on failure.
*/
static int hdmi_spd_infoframe_unpack(struct hdmi_spd_infoframe *frame,
const void *buffer, size_t size)
{
const u8 *ptr = buffer;
int ret;
if (size < HDMI_INFOFRAME_SIZE(SPD))
return -EINVAL;
if (ptr[0] != HDMI_INFOFRAME_TYPE_SPD ||
ptr[1] != 1 ||
ptr[2] != HDMI_SPD_INFOFRAME_SIZE) {
return -EINVAL;
}
if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(SPD)) != 0)
return -EINVAL;
ptr += HDMI_INFOFRAME_HEADER_SIZE;
ret = hdmi_spd_infoframe_init(frame, ptr, ptr + 8);
if (ret)
return ret;
frame->sdi = ptr[24];
return 0;
}
/**
* hdmi_audio_infoframe_unpack() - unpack binary buffer to a HDMI AUDIO infoframe
* @frame: HDMI Audio infoframe
* @buffer: source buffer
* @size: size of buffer
*
* Unpacks the information contained in binary @buffer into a structured
* @frame of the HDMI Audio information frame.
* Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
* specification.
*
* Returns 0 on success or a negative error code on failure.
*/
static int hdmi_audio_infoframe_unpack(struct hdmi_audio_infoframe *frame,
const void *buffer, size_t size)
{
const u8 *ptr = buffer;
int ret;
if (size < HDMI_INFOFRAME_SIZE(AUDIO))
return -EINVAL;
if (ptr[0] != HDMI_INFOFRAME_TYPE_AUDIO ||
ptr[1] != 1 ||
ptr[2] != HDMI_AUDIO_INFOFRAME_SIZE) {
return -EINVAL;
}
if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(AUDIO)) != 0)
return -EINVAL;
ret = hdmi_audio_infoframe_init(frame);
if (ret)
return ret;
ptr += HDMI_INFOFRAME_HEADER_SIZE;
frame->channels = ptr[0] & 0x7;
frame->coding_type = (ptr[0] >> 4) & 0xf;
frame->sample_size = ptr[1] & 0x3;
frame->sample_frequency = (ptr[1] >> 2) & 0x7;
frame->coding_type_ext = ptr[2] & 0x1f;
frame->channel_allocation = ptr[3];
frame->level_shift_value = (ptr[4] >> 3) & 0xf;
frame->downmix_inhibit = ptr[4] & 0x80 ? true : false;
return 0;
}
/**
* hdmi_vendor_any_infoframe_unpack() - unpack binary buffer to a HDMI
* vendor infoframe
* @frame: HDMI Vendor infoframe
* @buffer: source buffer
* @size: size of buffer
*
* Unpacks the information contained in binary @buffer into a structured
* @frame of the HDMI Vendor information frame.
* Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
* specification.
*
* Returns 0 on success or a negative error code on failure.
*/
static int
hdmi_vendor_any_infoframe_unpack(union hdmi_vendor_any_infoframe *frame,
const void *buffer, size_t size)
{
const u8 *ptr = buffer;
size_t length;
int ret;
u8 hdmi_video_format;
struct hdmi_vendor_infoframe *hvf = &frame->hdmi;
if (size < HDMI_INFOFRAME_HEADER_SIZE)
return -EINVAL;
if (ptr[0] != HDMI_INFOFRAME_TYPE_VENDOR ||
ptr[1] != 1 ||
(ptr[2] != 4 && ptr[2] != 5 && ptr[2] != 6))
return -EINVAL;
length = ptr[2];
if (size < HDMI_INFOFRAME_HEADER_SIZE + length)
return -EINVAL;
if (hdmi_infoframe_checksum(buffer,
HDMI_INFOFRAME_HEADER_SIZE + length) != 0)
return -EINVAL;
ptr += HDMI_INFOFRAME_HEADER_SIZE;
/* HDMI OUI */
if ((ptr[0] != 0x03) ||
(ptr[1] != 0x0c) ||
(ptr[2] != 0x00))
return -EINVAL;
hdmi_video_format = ptr[3] >> 5;
if (hdmi_video_format > 0x2)
return -EINVAL;
ret = hdmi_vendor_infoframe_init(hvf);
if (ret)
return ret;
hvf->length = length;
if (hdmi_video_format == 0x2) {
if (length != 5 && length != 6)
return -EINVAL;
hvf->s3d_struct = ptr[4] >> 4;
if (hvf->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF) {
if (length != 6)
return -EINVAL;
hvf->s3d_ext_data = ptr[5] >> 4;
}
} else if (hdmi_video_format == 0x1) {
if (length != 5)
return -EINVAL;
hvf->vic = ptr[4];
} else {
if (length != 4)
return -EINVAL;
}
return 0;
}
/**
* hdmi_drm_infoframe_unpack_only() - unpack binary buffer of CTA-861-G DRM
* infoframe DataBytes to a HDMI DRM
* infoframe
* @frame: HDMI DRM infoframe
* @buffer: source buffer
* @size: size of buffer
*
* Unpacks CTA-861-G DRM infoframe DataBytes contained in the binary @buffer
* into a structured @frame of the HDMI Dynamic Range and Mastering (DRM)
* infoframe.
*
* Returns 0 on success or a negative error code on failure.
*/
int hdmi_drm_infoframe_unpack_only(struct hdmi_drm_infoframe *frame,
const void *buffer, size_t size)
{
const u8 *ptr = buffer;
const u8 *temp;
u8 x_lsb, x_msb;
u8 y_lsb, y_msb;
int ret;
int i;
if (size < HDMI_DRM_INFOFRAME_SIZE)
return -EINVAL;
ret = hdmi_drm_infoframe_init(frame);
if (ret)
return ret;
frame->eotf = ptr[0] & 0x7;
frame->metadata_type = ptr[1] & 0x7;
temp = ptr + 2;
for (i = 0; i < 3; i++) {
x_lsb = *temp++;
x_msb = *temp++;
frame->display_primaries[i].x = (x_msb << 8) | x_lsb;
y_lsb = *temp++;
y_msb = *temp++;
frame->display_primaries[i].y = (y_msb << 8) | y_lsb;
}
frame->white_point.x = (ptr[15] << 8) | ptr[14];
frame->white_point.y = (ptr[17] << 8) | ptr[16];
frame->max_display_mastering_luminance = (ptr[19] << 8) | ptr[18];
frame->min_display_mastering_luminance = (ptr[21] << 8) | ptr[20];
frame->max_cll = (ptr[23] << 8) | ptr[22];
frame->max_fall = (ptr[25] << 8) | ptr[24];
return 0;
}
EXPORT_SYMBOL(hdmi_drm_infoframe_unpack_only);
/**
* hdmi_drm_infoframe_unpack() - unpack binary buffer to a HDMI DRM infoframe
* @frame: HDMI DRM infoframe
* @buffer: source buffer
* @size: size of buffer
*
* Unpacks the CTA-861-G DRM infoframe contained in the binary @buffer into
* a structured @frame of the HDMI Dynamic Range and Mastering (DRM)
* infoframe. It also verifies the checksum as required by section 5.3.5 of
* the HDMI 1.4 specification.
*
* Returns 0 on success or a negative error code on failure.
*/
static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame,
const void *buffer, size_t size)
{
const u8 *ptr = buffer;
int ret;
if (size < HDMI_INFOFRAME_SIZE(DRM))
return -EINVAL;
if (ptr[0] != HDMI_INFOFRAME_TYPE_DRM ||
ptr[1] != 1 ||
ptr[2] != HDMI_DRM_INFOFRAME_SIZE)
return -EINVAL;
if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(DRM)) != 0)
return -EINVAL;
ret = hdmi_drm_infoframe_unpack_only(frame, ptr + HDMI_INFOFRAME_HEADER_SIZE,
size - HDMI_INFOFRAME_HEADER_SIZE);
return ret;
}
/**
* hdmi_infoframe_unpack() - unpack binary buffer to a HDMI infoframe
* @frame: HDMI infoframe
* @buffer: source buffer
* @size: size of buffer
*
* Unpacks the information contained in binary buffer @buffer into a structured
* @frame of a HDMI infoframe.
* Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
* specification.
*
* Returns 0 on success or a negative error code on failure.
*/
int hdmi_infoframe_unpack(union hdmi_infoframe *frame,
const void *buffer, size_t size)
{
int ret;
const u8 *ptr = buffer;
if (size < HDMI_INFOFRAME_HEADER_SIZE)
return -EINVAL;
switch (ptr[0]) {
case HDMI_INFOFRAME_TYPE_AVI:
ret = hdmi_avi_infoframe_unpack(&frame->avi, buffer, size);
break;
case HDMI_INFOFRAME_TYPE_DRM:
ret = hdmi_drm_infoframe_unpack(&frame->drm, buffer, size);
break;
case HDMI_INFOFRAME_TYPE_SPD:
ret = hdmi_spd_infoframe_unpack(&frame->spd, buffer, size);
break;
case HDMI_INFOFRAME_TYPE_AUDIO:
ret = hdmi_audio_infoframe_unpack(&frame->audio, buffer, size);
break;
case HDMI_INFOFRAME_TYPE_VENDOR:
ret = hdmi_vendor_any_infoframe_unpack(&frame->vendor, buffer, size);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
EXPORT_SYMBOL(hdmi_infoframe_unpack);
| linux-master | drivers/video/hdmi.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* generic videomode helper
*
* Copyright (c) 2012 Steffen Trumtrar <[email protected]>, Pengutronix
*/
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/of.h>
#include <video/display_timing.h>
#include <video/of_display_timing.h>
#include <video/of_videomode.h>
#include <video/videomode.h>
/**
* of_get_videomode - get the videomode #<index> from devicetree
* @np: devicenode with the display_timings
* @vm: set to return value
* @index: index into list of display_timings
* (Set this to OF_USE_NATIVE_MODE to use whatever mode is
* specified as native mode in the DT.)
*
* DESCRIPTION:
* Get a list of all display timings and put the one
* specified by index into *vm. This function should only be used, if
* only one videomode is to be retrieved. A driver that needs to work
* with multiple/all videomodes should work with
* of_get_display_timings instead.
**/
int of_get_videomode(struct device_node *np, struct videomode *vm,
int index)
{
struct display_timings *disp;
int ret;
disp = of_get_display_timings(np);
if (!disp) {
pr_err("%pOF: no timings specified\n", np);
return -EINVAL;
}
if (index == OF_USE_NATIVE_MODE)
index = disp->native_mode;
ret = videomode_from_timings(disp, vm, index);
display_timings_release(disp);
return ret;
}
EXPORT_SYMBOL_GPL(of_get_videomode);
| linux-master | drivers/video/of_videomode.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* generic display timing functions
*
* Copyright (c) 2012 Steffen Trumtrar <[email protected]>, Pengutronix
*/
#include <linux/errno.h>
#include <linux/export.h>
#include <video/display_timing.h>
#include <video/videomode.h>
void videomode_from_timing(const struct display_timing *dt,
struct videomode *vm)
{
vm->pixelclock = dt->pixelclock.typ;
vm->hactive = dt->hactive.typ;
vm->hfront_porch = dt->hfront_porch.typ;
vm->hback_porch = dt->hback_porch.typ;
vm->hsync_len = dt->hsync_len.typ;
vm->vactive = dt->vactive.typ;
vm->vfront_porch = dt->vfront_porch.typ;
vm->vback_porch = dt->vback_porch.typ;
vm->vsync_len = dt->vsync_len.typ;
vm->flags = dt->flags;
}
EXPORT_SYMBOL_GPL(videomode_from_timing);
int videomode_from_timings(const struct display_timings *disp,
struct videomode *vm, unsigned int index)
{
struct display_timing *dt;
dt = display_timings_get(disp, index);
if (!dt)
return -EINVAL;
videomode_from_timing(dt, vm);
return 0;
}
EXPORT_SYMBOL_GPL(videomode_from_timings);
| linux-master | drivers/video/videomode.c |
// SPDX-License-Identifier: MIT
#include <linux/aperture.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/sysfb.h>
#include <linux/types.h>
#include <linux/vgaarb.h>
#include <video/vga.h>
/**
* DOC: overview
*
* A graphics device might be supported by different drivers, but only one
* driver can be active at any given time. Many systems load a generic
* graphics drivers, such as EFI-GOP or VESA, early during the boot process.
* During later boot stages, they replace the generic driver with a dedicated,
* hardware-specific driver. To take over the device, the dedicated driver
* first has to remove the generic driver. Aperture functions manage
* ownership of framebuffer memory and hand-over between drivers.
*
* Graphics drivers should call aperture_remove_conflicting_devices()
* at the top of their probe function. The function removes any generic
* driver that is currently associated with the given framebuffer memory.
* An example for a graphics device on the platform bus is shown below.
*
* .. code-block:: c
*
* static int example_probe(struct platform_device *pdev)
* {
* struct resource *mem;
* resource_size_t base, size;
* int ret;
*
* mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
* if (!mem)
* return -ENODEV;
* base = mem->start;
* size = resource_size(mem);
*
* ret = aperture_remove_conflicting_devices(base, size, "example");
* if (ret)
* return ret;
*
* // Initialize the hardware
* ...
*
* return 0;
* }
*
* static const struct platform_driver example_driver = {
* .probe = example_probe,
* ...
* };
*
* The given example reads the platform device's I/O-memory range from the
* device instance. An active framebuffer will be located within this range.
* The call to aperture_remove_conflicting_devices() releases drivers that
* have previously claimed ownership of the range and are currently driving
* output on the framebuffer. If successful, the new driver can take over
* the device.
*
* While the given example uses a platform device, the aperture helpers work
* with every bus that has an addressable framebuffer. In the case of PCI,
* device drivers can also call aperture_remove_conflicting_pci_devices() and
* let the function detect the apertures automatically. Device drivers without
* knowledge of the framebuffer's location can call
* aperture_remove_all_conflicting_devices(), which removes all known devices.
*
* Drivers that are susceptible to being removed by other drivers, such as
* generic EFI or VESA drivers, have to register themselves as owners of their
* framebuffer apertures. Ownership of the framebuffer memory is achieved
* by calling devm_aperture_acquire_for_platform_device(). If successful, the
* driver is the owner of the framebuffer range. The function fails if the
* framebuffer is already owned by another driver. See below for an example.
*
* .. code-block:: c
*
* static int generic_probe(struct platform_device *pdev)
* {
* struct resource *mem;
* resource_size_t base, size;
*
* mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
* if (!mem)
* return -ENODEV;
* base = mem->start;
* size = resource_size(mem);
*
* ret = devm_aperture_acquire_for_platform_device(pdev, base, size);
* if (ret)
* return ret;
*
* // Initialize the hardware
* ...
*
* return 0;
* }
*
* static int generic_remove(struct platform_device *)
* {
* // Hot-unplug the device
* ...
*
* return 0;
* }
*
* static const struct platform_driver generic_driver = {
* .probe = generic_probe,
* .remove = generic_remove,
* ...
* };
*
* The similar to the previous example, the generic driver claims ownership
* of the framebuffer memory from its probe function. This will fail if the
* memory range, or parts of it, is already owned by another driver.
*
* If successful, the generic driver is now subject to forced removal by
* another driver. This only works for platform drivers that support hot
* unplugging. When a driver calls aperture_remove_conflicting_devices()
* et al for the registered framebuffer range, the aperture helpers call
* platform_device_unregister() and the generic driver unloads itself. The
* generic driver also has to provide a remove function to make this work.
* Once hot unplugged from hardware, it may not access the device's
* registers, framebuffer memory, ROM, etc afterwards.
*/
struct aperture_range {
struct device *dev;
resource_size_t base;
resource_size_t size;
struct list_head lh;
void (*detach)(struct device *dev);
};
static LIST_HEAD(apertures);
static DEFINE_MUTEX(apertures_lock);
static bool overlap(resource_size_t base1, resource_size_t end1,
resource_size_t base2, resource_size_t end2)
{
return (base1 < end2) && (end1 > base2);
}
static void devm_aperture_acquire_release(void *data)
{
struct aperture_range *ap = data;
bool detached = !ap->dev;
if (detached)
return;
mutex_lock(&apertures_lock);
list_del(&ap->lh);
mutex_unlock(&apertures_lock);
}
static int devm_aperture_acquire(struct device *dev,
resource_size_t base, resource_size_t size,
void (*detach)(struct device *))
{
size_t end = base + size;
struct list_head *pos;
struct aperture_range *ap;
mutex_lock(&apertures_lock);
list_for_each(pos, &apertures) {
ap = container_of(pos, struct aperture_range, lh);
if (overlap(base, end, ap->base, ap->base + ap->size)) {
mutex_unlock(&apertures_lock);
return -EBUSY;
}
}
ap = devm_kzalloc(dev, sizeof(*ap), GFP_KERNEL);
if (!ap) {
mutex_unlock(&apertures_lock);
return -ENOMEM;
}
ap->dev = dev;
ap->base = base;
ap->size = size;
ap->detach = detach;
INIT_LIST_HEAD(&ap->lh);
list_add(&ap->lh, &apertures);
mutex_unlock(&apertures_lock);
return devm_add_action_or_reset(dev, devm_aperture_acquire_release, ap);
}
static void aperture_detach_platform_device(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
/*
* Remove the device from the device hierarchy. This is the right thing
* to do for firmware-based fb drivers, such as EFI, VESA or VGA. After
* the new driver takes over the hardware, the firmware device's state
* will be lost.
*
* For non-platform devices, a new callback would be required.
*
* If the aperture helpers ever need to handle native drivers, this call
* would only have to unplug the DRM device, so that the hardware device
* stays around after detachment.
*/
platform_device_unregister(pdev);
}
/**
* devm_aperture_acquire_for_platform_device - Acquires ownership of an aperture
* on behalf of a platform device.
* @pdev: the platform device to own the aperture
* @base: the aperture's byte offset in physical memory
* @size: the aperture size in bytes
*
* Installs the given device as the new owner of the aperture. The function
* expects the aperture to be provided by a platform device. If another
* driver takes over ownership of the aperture, aperture helpers will then
* unregister the platform device automatically. All acquired apertures are
* released automatically when the underlying device goes away.
*
* The function fails if the aperture, or parts of it, is currently
* owned by another device. To evict current owners, callers should use
* remove_conflicting_devices() et al. before calling this function.
*
* Returns:
* 0 on success, or a negative errno value otherwise.
*/
int devm_aperture_acquire_for_platform_device(struct platform_device *pdev,
resource_size_t base,
resource_size_t size)
{
return devm_aperture_acquire(&pdev->dev, base, size, aperture_detach_platform_device);
}
EXPORT_SYMBOL(devm_aperture_acquire_for_platform_device);
static void aperture_detach_devices(resource_size_t base, resource_size_t size)
{
resource_size_t end = base + size;
struct list_head *pos, *n;
mutex_lock(&apertures_lock);
list_for_each_safe(pos, n, &apertures) {
struct aperture_range *ap = container_of(pos, struct aperture_range, lh);
struct device *dev = ap->dev;
if (WARN_ON_ONCE(!dev))
continue;
if (!overlap(base, end, ap->base, ap->base + ap->size))
continue;
ap->dev = NULL; /* detach from device */
list_del(&ap->lh);
ap->detach(dev);
}
mutex_unlock(&apertures_lock);
}
/**
* aperture_remove_conflicting_devices - remove devices in the given range
* @base: the aperture's base address in physical memory
* @size: aperture size in bytes
* @name: a descriptive name of the requesting driver
*
* This function removes devices that own apertures within @base and @size.
*
* Returns:
* 0 on success, or a negative errno code otherwise
*/
int aperture_remove_conflicting_devices(resource_size_t base, resource_size_t size,
const char *name)
{
/*
* If a driver asked to unregister a platform device registered by
* sysfb, then can be assumed that this is a driver for a display
* that is set up by the system firmware and has a generic driver.
*
* Drivers for devices that don't have a generic driver will never
* ask for this, so let's assume that a real driver for the display
* was already probed and prevent sysfb to register devices later.
*/
sysfb_disable();
aperture_detach_devices(base, size);
return 0;
}
EXPORT_SYMBOL(aperture_remove_conflicting_devices);
/**
* __aperture_remove_legacy_vga_devices - remove legacy VGA devices of a PCI devices
* @pdev: PCI device
*
* This function removes VGA devices provided by @pdev, such as a VGA
* framebuffer or a console. This is useful if you have a VGA-compatible
* PCI graphics device with framebuffers in non-BAR locations. Drivers
* should acquire ownership of those memory areas and afterwards call
* this helper to release remaining VGA devices.
*
* If your hardware has its framebuffers accessible via PCI BARS, use
* aperture_remove_conflicting_pci_devices() instead. The function will
* release any VGA devices automatically.
*
* WARNING: Apparently we must remove graphics drivers before calling
* this helper. Otherwise the vga fbdev driver falls over if
* we have vgacon configured.
*
* Returns:
* 0 on success, or a negative errno code otherwise
*/
int __aperture_remove_legacy_vga_devices(struct pci_dev *pdev)
{
/* VGA framebuffer */
aperture_detach_devices(VGA_FB_PHYS_BASE, VGA_FB_PHYS_SIZE);
/* VGA textmode console */
return vga_remove_vgacon(pdev);
}
EXPORT_SYMBOL(__aperture_remove_legacy_vga_devices);
/**
* aperture_remove_conflicting_pci_devices - remove existing framebuffers for PCI devices
* @pdev: PCI device
* @name: a descriptive name of the requesting driver
*
* This function removes devices that own apertures within any of @pdev's
* memory bars. The function assumes that PCI device with shadowed ROM
* drives a primary display and therefore kicks out vga16fb as well.
*
* Returns:
* 0 on success, or a negative errno code otherwise
*/
int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *name)
{
bool primary = false;
resource_size_t base, size;
int bar, ret = 0;
if (pdev == vga_default_device())
primary = true;
if (primary)
sysfb_disable();
for (bar = 0; bar < PCI_STD_NUM_BARS; ++bar) {
if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
continue;
base = pci_resource_start(pdev, bar);
size = pci_resource_len(pdev, bar);
aperture_detach_devices(base, size);
}
/*
* If this is the primary adapter, there could be a VGA device
* that consumes the VGA framebuffer I/O range. Remove this
* device as well.
*/
if (primary)
ret = __aperture_remove_legacy_vga_devices(pdev);
return ret;
}
EXPORT_SYMBOL(aperture_remove_conflicting_pci_devices);
| linux-master | drivers/video/aperture.c |
// SPDX-License-Identifier: GPL-2.0
/*
* Based on the fbdev code in drivers/video/fbdev/core/fb_cmdline:
*
* Copyright (C) 2014 Intel Corp
* Copyright (C) 1994 Martin Schaller
*
* 2001 - Documented with DocBook
* - Brad Douglas <[email protected]>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*
* Authors:
* Daniel Vetter <[email protected]>
*/
#include <linux/fb.h> /* for FB_MAX */
#include <linux/init.h>
#include <video/cmdline.h>
/*
* FB_MAX is the maximum number of framebuffer devices and also
* the maximum number of video= parameters. Although not directly
* related to each other, it makes sense to keep it that way.
*/
static const char *video_options[FB_MAX] __read_mostly;
static const char *video_option __read_mostly;
static int video_of_only __read_mostly;
static const char *__video_get_option_string(const char *name)
{
const char *options = NULL;
size_t name_len = 0;
if (name)
name_len = strlen(name);
if (name_len) {
unsigned int i;
const char *opt;
for (i = 0; i < ARRAY_SIZE(video_options); ++i) {
if (!video_options[i])
continue;
if (video_options[i][0] == '\0')
continue;
opt = video_options[i];
if (!strncmp(opt, name, name_len) && opt[name_len] == ':')
options = opt + name_len + 1;
}
}
/* No match, return global options */
if (!options)
options = video_option;
return options;
}
/**
* video_get_options - get kernel boot parameters
* @name: name of the output as it would appear in the boot parameter
* line (video=<name>:<options>)
*
* Looks up the video= options for the given name. Names are connector
* names with DRM, or driver names with fbdev. If no video option for
* the name has been specified, the function returns the global video=
* setting. A @name of NULL always returns the global video setting.
*
* Returns:
* The string of video options for the given name, or NULL if no video
* option has been specified.
*/
const char *video_get_options(const char *name)
{
return __video_get_option_string(name);
}
EXPORT_SYMBOL(video_get_options);
bool __video_get_options(const char *name, const char **options, bool is_of)
{
bool enabled = true;
const char *opt = NULL;
if (video_of_only && !is_of)
enabled = false;
opt = __video_get_option_string(name);
if (options)
*options = opt;
return enabled;
}
EXPORT_SYMBOL(__video_get_options);
/*
* Process command line options for video adapters. This function is
* a __setup and __init function. It only stores the options. Drivers
* have to call video_get_options() as necessary.
*/
static int __init video_setup(char *options)
{
if (!options || !*options)
goto out;
if (!strncmp(options, "ofonly", 6)) {
video_of_only = true;
goto out;
}
if (strchr(options, ':')) {
/* named */
size_t i;
for (i = 0; i < ARRAY_SIZE(video_options); i++) {
if (!video_options[i]) {
video_options[i] = options;
break;
}
}
} else {
/* global */
video_option = options;
}
out:
return 1;
}
__setup("video=", video_setup);
| linux-master | drivers/video/cmdline.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* OF helpers for parsing display timings
*
* Copyright (c) 2012 Steffen Trumtrar <[email protected]>, Pengutronix
*
* based on of_videomode.c by Sascha Hauer <[email protected]>
*/
#include <linux/export.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <video/display_timing.h>
#include <video/of_display_timing.h>
/**
* parse_timing_property - parse timing_entry from device_node
* @np: device_node with the property
* @name: name of the property
* @result: will be set to the return value
*
* DESCRIPTION:
* Every display_timing can be specified with either just the typical value or
* a range consisting of min/typ/max. This function helps handling this
**/
static int parse_timing_property(const struct device_node *np, const char *name,
struct timing_entry *result)
{
struct property *prop;
int length, cells, ret;
prop = of_find_property(np, name, &length);
if (!prop) {
pr_err("%pOF: could not find property %s\n", np, name);
return -EINVAL;
}
cells = length / sizeof(u32);
if (cells == 1) {
ret = of_property_read_u32(np, name, &result->typ);
result->min = result->typ;
result->max = result->typ;
} else if (cells == 3) {
ret = of_property_read_u32_array(np, name, &result->min, cells);
} else {
pr_err("%pOF: illegal timing specification in %s\n", np, name);
return -EINVAL;
}
return ret;
}
/**
* of_parse_display_timing - parse display_timing entry from device_node
* @np: device_node with the properties
* @dt: display_timing that contains the result. I may be partially written in case of errors
**/
static int of_parse_display_timing(const struct device_node *np,
struct display_timing *dt)
{
u32 val = 0;
int ret = 0;
memset(dt, 0, sizeof(*dt));
ret |= parse_timing_property(np, "hback-porch", &dt->hback_porch);
ret |= parse_timing_property(np, "hfront-porch", &dt->hfront_porch);
ret |= parse_timing_property(np, "hactive", &dt->hactive);
ret |= parse_timing_property(np, "hsync-len", &dt->hsync_len);
ret |= parse_timing_property(np, "vback-porch", &dt->vback_porch);
ret |= parse_timing_property(np, "vfront-porch", &dt->vfront_porch);
ret |= parse_timing_property(np, "vactive", &dt->vactive);
ret |= parse_timing_property(np, "vsync-len", &dt->vsync_len);
ret |= parse_timing_property(np, "clock-frequency", &dt->pixelclock);
dt->flags = 0;
if (!of_property_read_u32(np, "vsync-active", &val))
dt->flags |= val ? DISPLAY_FLAGS_VSYNC_HIGH :
DISPLAY_FLAGS_VSYNC_LOW;
if (!of_property_read_u32(np, "hsync-active", &val))
dt->flags |= val ? DISPLAY_FLAGS_HSYNC_HIGH :
DISPLAY_FLAGS_HSYNC_LOW;
if (!of_property_read_u32(np, "de-active", &val))
dt->flags |= val ? DISPLAY_FLAGS_DE_HIGH :
DISPLAY_FLAGS_DE_LOW;
if (!of_property_read_u32(np, "pixelclk-active", &val))
dt->flags |= val ? DISPLAY_FLAGS_PIXDATA_POSEDGE :
DISPLAY_FLAGS_PIXDATA_NEGEDGE;
if (!of_property_read_u32(np, "syncclk-active", &val))
dt->flags |= val ? DISPLAY_FLAGS_SYNC_POSEDGE :
DISPLAY_FLAGS_SYNC_NEGEDGE;
else if (dt->flags & (DISPLAY_FLAGS_PIXDATA_POSEDGE |
DISPLAY_FLAGS_PIXDATA_NEGEDGE))
dt->flags |= dt->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE ?
DISPLAY_FLAGS_SYNC_POSEDGE :
DISPLAY_FLAGS_SYNC_NEGEDGE;
if (of_property_read_bool(np, "interlaced"))
dt->flags |= DISPLAY_FLAGS_INTERLACED;
if (of_property_read_bool(np, "doublescan"))
dt->flags |= DISPLAY_FLAGS_DOUBLESCAN;
if (of_property_read_bool(np, "doubleclk"))
dt->flags |= DISPLAY_FLAGS_DOUBLECLK;
if (ret) {
pr_err("%pOF: error reading timing properties\n", np);
return -EINVAL;
}
return 0;
}
/**
* of_get_display_timing - parse a display_timing entry
* @np: device_node with the timing subnode
* @name: name of the timing node
* @dt: display_timing struct to fill
**/
int of_get_display_timing(const struct device_node *np, const char *name,
struct display_timing *dt)
{
struct device_node *timing_np;
int ret;
if (!np)
return -EINVAL;
timing_np = of_get_child_by_name(np, name);
if (!timing_np)
return -ENOENT;
ret = of_parse_display_timing(timing_np, dt);
of_node_put(timing_np);
return ret;
}
EXPORT_SYMBOL_GPL(of_get_display_timing);
/**
* of_get_display_timings - parse all display_timing entries from a device_node
* @np: device_node with the subnodes
**/
struct display_timings *of_get_display_timings(const struct device_node *np)
{
struct device_node *timings_np;
struct device_node *entry;
struct device_node *native_mode;
struct display_timings *disp;
if (!np)
return NULL;
timings_np = of_get_child_by_name(np, "display-timings");
if (!timings_np) {
pr_err("%pOF: could not find display-timings node\n", np);
return NULL;
}
disp = kzalloc(sizeof(*disp), GFP_KERNEL);
if (!disp) {
pr_err("%pOF: could not allocate struct disp'\n", np);
goto dispfail;
}
entry = of_parse_phandle(timings_np, "native-mode", 0);
/* assume first child as native mode if none provided */
if (!entry)
entry = of_get_next_child(timings_np, NULL);
/* if there is no child, it is useless to go on */
if (!entry) {
pr_err("%pOF: no timing specifications given\n", np);
goto entryfail;
}
pr_debug("%pOF: using %pOFn as default timing\n", np, entry);
native_mode = entry;
disp->num_timings = of_get_child_count(timings_np);
if (disp->num_timings == 0) {
/* should never happen, as entry was already found above */
pr_err("%pOF: no timings specified\n", np);
goto entryfail;
}
disp->timings = kcalloc(disp->num_timings,
sizeof(struct display_timing *),
GFP_KERNEL);
if (!disp->timings) {
pr_err("%pOF: could not allocate timings array\n", np);
goto entryfail;
}
disp->num_timings = 0;
disp->native_mode = 0;
for_each_child_of_node(timings_np, entry) {
struct display_timing *dt;
int r;
dt = kmalloc(sizeof(*dt), GFP_KERNEL);
if (!dt) {
pr_err("%pOF: could not allocate display_timing struct\n",
np);
goto timingfail;
}
r = of_parse_display_timing(entry, dt);
if (r) {
/*
* to not encourage wrong devicetrees, fail in case of
* an error
*/
pr_err("%pOF: error in timing %d\n",
np, disp->num_timings + 1);
kfree(dt);
goto timingfail;
}
if (native_mode == entry)
disp->native_mode = disp->num_timings;
disp->timings[disp->num_timings] = dt;
disp->num_timings++;
}
of_node_put(timings_np);
/*
* native_mode points to the device_node returned by of_parse_phandle
* therefore call of_node_put on it
*/
of_node_put(native_mode);
pr_debug("%pOF: got %d timings. Using timing #%d as default\n",
np, disp->num_timings,
disp->native_mode + 1);
return disp;
timingfail:
of_node_put(native_mode);
display_timings_release(disp);
disp = NULL;
entryfail:
kfree(disp);
dispfail:
of_node_put(timings_np);
return NULL;
}
EXPORT_SYMBOL_GPL(of_get_display_timings);
| linux-master | drivers/video/of_display_timing.c |
/*
* linux/drivers/video/vgastate.c -- VGA state save/restore
*
* Copyright 2002 James Simmons
*
* Copyright history from vga16fb.c:
* Copyright 1999 Ben Pfaff and Petr Vandrovec
* Based on VGA info at http://www.goodnet.com/~tinara/FreeVGA/home.htm
* Based on VESA framebuffer (c) 1998 Gerd Knorr
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file COPYING in the main directory of this
* archive for more details.
*
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/vmalloc.h>
#include <video/vga.h>
struct regstate {
__u8 *vga_font0;
__u8 *vga_font1;
__u8 *vga_text;
__u8 *vga_cmap;
__u8 *attr;
__u8 *crtc;
__u8 *gfx;
__u8 *seq;
__u8 misc;
};
static inline unsigned char vga_rcrtcs(void __iomem *regbase, unsigned short iobase,
unsigned char reg)
{
vga_w(regbase, iobase + 0x4, reg);
return vga_r(regbase, iobase + 0x5);
}
static inline void vga_wcrtcs(void __iomem *regbase, unsigned short iobase,
unsigned char reg, unsigned char val)
{
vga_w(regbase, iobase + 0x4, reg);
vga_w(regbase, iobase + 0x5, val);
}
static void save_vga_text(struct vgastate *state, void __iomem *fbbase)
{
struct regstate *saved = (struct regstate *) state->vidstate;
int i;
u8 misc, attr10, gr4, gr5, gr6, seq1, seq2, seq4;
unsigned short iobase;
/* if in graphics mode, no need to save */
misc = vga_r(state->vgabase, VGA_MIS_R);
iobase = (misc & 1) ? 0x3d0 : 0x3b0;
vga_r(state->vgabase, iobase + 0xa);
vga_w(state->vgabase, VGA_ATT_W, 0x00);
attr10 = vga_rattr(state->vgabase, 0x10);
vga_r(state->vgabase, iobase + 0xa);
vga_w(state->vgabase, VGA_ATT_W, 0x20);
if (attr10 & 1)
return;
/* save regs */
gr4 = vga_rgfx(state->vgabase, VGA_GFX_PLANE_READ);
gr5 = vga_rgfx(state->vgabase, VGA_GFX_MODE);
gr6 = vga_rgfx(state->vgabase, VGA_GFX_MISC);
seq2 = vga_rseq(state->vgabase, VGA_SEQ_PLANE_WRITE);
seq4 = vga_rseq(state->vgabase, VGA_SEQ_MEMORY_MODE);
/* blank screen */
seq1 = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE);
vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 | 1 << 5);
vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3);
/* save font at plane 2 */
if (state->flags & VGA_SAVE_FONT0) {
vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x4);
vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x2);
vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
for (i = 0; i < 4 * 8192; i++)
saved->vga_font0[i] = vga_r(fbbase, i);
}
/* save font at plane 3 */
if (state->flags & VGA_SAVE_FONT1) {
vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x8);
vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x3);
vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
for (i = 0; i < state->memsize; i++)
saved->vga_font1[i] = vga_r(fbbase, i);
}
/* save font at plane 0/1 */
if (state->flags & VGA_SAVE_TEXT) {
vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x1);
vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x0);
vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
for (i = 0; i < 8192; i++)
saved->vga_text[i] = vga_r(fbbase, i);
vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x2);
vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x1);
vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
for (i = 0; i < 8192; i++)
saved->vga_text[8192+i] = vga_r(fbbase + 2 * 8192, i);
}
/* restore regs */
vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, seq2);
vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, seq4);
vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, gr4);
vga_wgfx(state->vgabase, VGA_GFX_MODE, gr5);
vga_wgfx(state->vgabase, VGA_GFX_MISC, gr6);
/* unblank screen */
vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 & ~(1 << 5));
vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3);
vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1);
}
static void restore_vga_text(struct vgastate *state, void __iomem *fbbase)
{
struct regstate *saved = (struct regstate *) state->vidstate;
int i;
u8 gr1, gr3, gr4, gr5, gr6, gr8;
u8 seq1, seq2, seq4;
/* save regs */
gr1 = vga_rgfx(state->vgabase, VGA_GFX_SR_ENABLE);
gr3 = vga_rgfx(state->vgabase, VGA_GFX_DATA_ROTATE);
gr4 = vga_rgfx(state->vgabase, VGA_GFX_PLANE_READ);
gr5 = vga_rgfx(state->vgabase, VGA_GFX_MODE);
gr6 = vga_rgfx(state->vgabase, VGA_GFX_MISC);
gr8 = vga_rgfx(state->vgabase, VGA_GFX_BIT_MASK);
seq2 = vga_rseq(state->vgabase, VGA_SEQ_PLANE_WRITE);
seq4 = vga_rseq(state->vgabase, VGA_SEQ_MEMORY_MODE);
/* blank screen */
seq1 = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE);
vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 | 1 << 5);
vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3);
if (state->depth == 4) {
vga_wgfx(state->vgabase, VGA_GFX_DATA_ROTATE, 0x0);
vga_wgfx(state->vgabase, VGA_GFX_BIT_MASK, 0xff);
vga_wgfx(state->vgabase, VGA_GFX_SR_ENABLE, 0x00);
}
/* restore font at plane 2 */
if (state->flags & VGA_SAVE_FONT0) {
vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x4);
vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x2);
vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
for (i = 0; i < 4 * 8192; i++)
vga_w(fbbase, i, saved->vga_font0[i]);
}
/* restore font at plane 3 */
if (state->flags & VGA_SAVE_FONT1) {
vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x8);
vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x3);
vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
for (i = 0; i < state->memsize; i++)
vga_w(fbbase, i, saved->vga_font1[i]);
}
/* restore font at plane 0/1 */
if (state->flags & VGA_SAVE_TEXT) {
vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x1);
vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x0);
vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
for (i = 0; i < 8192; i++)
vga_w(fbbase, i, saved->vga_text[i]);
vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x2);
vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x1);
vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
for (i = 0; i < 8192; i++)
vga_w(fbbase, i, saved->vga_text[8192+i]);
}
/* unblank screen */
vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 & ~(1 << 5));
vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3);
/* restore regs */
vga_wgfx(state->vgabase, VGA_GFX_SR_ENABLE, gr1);
vga_wgfx(state->vgabase, VGA_GFX_DATA_ROTATE, gr3);
vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, gr4);
vga_wgfx(state->vgabase, VGA_GFX_MODE, gr5);
vga_wgfx(state->vgabase, VGA_GFX_MISC, gr6);
vga_wgfx(state->vgabase, VGA_GFX_BIT_MASK, gr8);
vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1);
vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, seq2);
vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, seq4);
}
static void save_vga_mode(struct vgastate *state)
{
struct regstate *saved = (struct regstate *) state->vidstate;
unsigned short iobase;
int i;
saved->misc = vga_r(state->vgabase, VGA_MIS_R);
if (saved->misc & 1)
iobase = 0x3d0;
else
iobase = 0x3b0;
for (i = 0; i < state->num_crtc; i++)
saved->crtc[i] = vga_rcrtcs(state->vgabase, iobase, i);
vga_r(state->vgabase, iobase + 0xa);
vga_w(state->vgabase, VGA_ATT_W, 0x00);
for (i = 0; i < state->num_attr; i++) {
vga_r(state->vgabase, iobase + 0xa);
saved->attr[i] = vga_rattr(state->vgabase, i);
}
vga_r(state->vgabase, iobase + 0xa);
vga_w(state->vgabase, VGA_ATT_W, 0x20);
for (i = 0; i < state->num_gfx; i++)
saved->gfx[i] = vga_rgfx(state->vgabase, i);
for (i = 0; i < state->num_seq; i++)
saved->seq[i] = vga_rseq(state->vgabase, i);
}
static void restore_vga_mode(struct vgastate *state)
{
struct regstate *saved = (struct regstate *) state->vidstate;
unsigned short iobase;
int i;
vga_w(state->vgabase, VGA_MIS_W, saved->misc);
if (saved->misc & 1)
iobase = 0x3d0;
else
iobase = 0x3b0;
/* turn off display */
vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE,
saved->seq[VGA_SEQ_CLOCK_MODE] | 0x20);
/* disable sequencer */
vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x01);
/* enable palette addressing */
vga_r(state->vgabase, iobase + 0xa);
vga_w(state->vgabase, VGA_ATT_W, 0x00);
for (i = 2; i < state->num_seq; i++)
vga_wseq(state->vgabase, i, saved->seq[i]);
/* unprotect vga regs */
vga_wcrtcs(state->vgabase, iobase, 17, saved->crtc[17] & ~0x80);
for (i = 0; i < state->num_crtc; i++)
vga_wcrtcs(state->vgabase, iobase, i, saved->crtc[i]);
for (i = 0; i < state->num_gfx; i++)
vga_wgfx(state->vgabase, i, saved->gfx[i]);
for (i = 0; i < state->num_attr; i++) {
vga_r(state->vgabase, iobase + 0xa);
vga_wattr(state->vgabase, i, saved->attr[i]);
}
/* reenable sequencer */
vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03);
/* turn display on */
vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE,
saved->seq[VGA_SEQ_CLOCK_MODE] & ~(1 << 5));
/* disable video/palette source */
vga_r(state->vgabase, iobase + 0xa);
vga_w(state->vgabase, VGA_ATT_W, 0x20);
}
static void save_vga_cmap(struct vgastate *state)
{
struct regstate *saved = (struct regstate *) state->vidstate;
int i;
vga_w(state->vgabase, VGA_PEL_MSK, 0xff);
/* assumes DAC is readable and writable */
vga_w(state->vgabase, VGA_PEL_IR, 0x00);
for (i = 0; i < 768; i++)
saved->vga_cmap[i] = vga_r(state->vgabase, VGA_PEL_D);
}
static void restore_vga_cmap(struct vgastate *state)
{
struct regstate *saved = (struct regstate *) state->vidstate;
int i;
vga_w(state->vgabase, VGA_PEL_MSK, 0xff);
/* assumes DAC is readable and writable */
vga_w(state->vgabase, VGA_PEL_IW, 0x00);
for (i = 0; i < 768; i++)
vga_w(state->vgabase, VGA_PEL_D, saved->vga_cmap[i]);
}
static void vga_cleanup(struct vgastate *state)
{
if (state->vidstate != NULL) {
struct regstate *saved = (struct regstate *) state->vidstate;
vfree(saved->vga_font0);
vfree(saved->vga_font1);
vfree(saved->vga_text);
vfree(saved->vga_cmap);
vfree(saved->attr);
kfree(saved);
state->vidstate = NULL;
}
}
int save_vga(struct vgastate *state)
{
struct regstate *saved;
saved = kzalloc(sizeof(struct regstate), GFP_KERNEL);
if (saved == NULL)
return 1;
state->vidstate = (void *)saved;
if (state->flags & VGA_SAVE_CMAP) {
saved->vga_cmap = vmalloc(768);
if (!saved->vga_cmap) {
vga_cleanup(state);
return 1;
}
save_vga_cmap(state);
}
if (state->flags & VGA_SAVE_MODE) {
int total;
if (state->num_attr < 21)
state->num_attr = 21;
if (state->num_crtc < 25)
state->num_crtc = 25;
if (state->num_gfx < 9)
state->num_gfx = 9;
if (state->num_seq < 5)
state->num_seq = 5;
total = state->num_attr + state->num_crtc +
state->num_gfx + state->num_seq;
saved->attr = vmalloc(total);
if (!saved->attr) {
vga_cleanup(state);
return 1;
}
saved->crtc = saved->attr + state->num_attr;
saved->gfx = saved->crtc + state->num_crtc;
saved->seq = saved->gfx + state->num_gfx;
save_vga_mode(state);
}
if (state->flags & VGA_SAVE_FONTS) {
void __iomem *fbbase;
/* exit if window is less than 32K */
if (state->memsize && state->memsize < 4 * 8192) {
vga_cleanup(state);
return 1;
}
if (!state->memsize)
state->memsize = 8 * 8192;
if (!state->membase)
state->membase = 0xA0000;
fbbase = ioremap(state->membase, state->memsize);
if (!fbbase) {
vga_cleanup(state);
return 1;
}
/*
* save only first 32K used by vgacon
*/
if (state->flags & VGA_SAVE_FONT0) {
saved->vga_font0 = vmalloc(4 * 8192);
if (!saved->vga_font0) {
iounmap(fbbase);
vga_cleanup(state);
return 1;
}
}
/*
* largely unused, but if required by the caller
* we'll just save everything.
*/
if (state->flags & VGA_SAVE_FONT1) {
saved->vga_font1 = vmalloc(state->memsize);
if (!saved->vga_font1) {
iounmap(fbbase);
vga_cleanup(state);
return 1;
}
}
/*
* Save 8K at plane0[0], and 8K at plane1[16K]
*/
if (state->flags & VGA_SAVE_TEXT) {
saved->vga_text = vmalloc(8192 * 2);
if (!saved->vga_text) {
iounmap(fbbase);
vga_cleanup(state);
return 1;
}
}
save_vga_text(state, fbbase);
iounmap(fbbase);
}
return 0;
}
int restore_vga(struct vgastate *state)
{
if (state->vidstate == NULL)
return 1;
if (state->flags & VGA_SAVE_MODE)
restore_vga_mode(state);
if (state->flags & VGA_SAVE_FONTS) {
void __iomem *fbbase = ioremap(state->membase, state->memsize);
if (!fbbase) {
vga_cleanup(state);
return 1;
}
restore_vga_text(state, fbbase);
iounmap(fbbase);
}
if (state->flags & VGA_SAVE_CMAP)
restore_vga_cmap(state);
vga_cleanup(state);
return 0;
}
EXPORT_SYMBOL(save_vga);
EXPORT_SYMBOL(restore_vga);
MODULE_AUTHOR("James Simmons <[email protected]>");
MODULE_DESCRIPTION("VGA State Save/Restore");
MODULE_LICENSE("GPL");
| linux-master | drivers/video/vgastate.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/drivers/video/console/sticore.c -
* core code for console driver using HP's STI firmware
*
* Copyright (C) 2000 Philipp Rumpf <[email protected]>
* Copyright (C) 2001-2023 Helge Deller <[email protected]>
* Copyright (C) 2001-2002 Thomas Bogendoerfer <[email protected]>
*
* TODO:
* - call STI in virtual mode rather than in real mode
* - screen blanking with state_mgmt() in text mode STI ?
* - try to make it work on m68k hp workstations ;)
*
*/
#define pr_fmt(fmt) "%s: " fmt, KBUILD_MODNAME
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/font.h>
#include <asm/hardware.h>
#include <asm/page.h>
#include <asm/parisc-device.h>
#include <asm/pdc.h>
#include <asm/cacheflush.h>
#include <asm/grfioctl.h>
#include <video/sticore.h>
#define STI_DRIVERVERSION "Version 0.9c"
static struct sti_struct *default_sti __read_mostly;
/* number of STI ROMS found and their ptrs to each struct */
static int num_sti_roms __read_mostly;
static struct sti_struct *sti_roms[MAX_STI_ROMS] __read_mostly;
static void *store_sti_val(struct sti_struct *sti, void *ptr, unsigned long val)
{
u32 *ptr32 = ptr;
if (IS_ENABLED(CONFIG_64BIT) && sti->do_call64) {
/* used for 64-bit STI ROM */
unsigned long *ptr64 = ptr;
ptr64 = PTR_ALIGN(ptr64, sizeof(void *));
*ptr64++ = val;
return ptr64;
}
/* used for 32-bit STI ROM */
*ptr32++ = val;
return ptr32;
}
#define store_sti_ptr(sti, dest, ptr) \
store_sti_val(sti, dest, STI_PTR(ptr))
/* The colour indices used by STI are
* 0 - Black
* 1 - White
* 2 - Red
* 3 - Yellow/Brown
* 4 - Green
* 5 - Cyan
* 6 - Blue
* 7 - Magenta
*
* So we have the same colours as VGA (basically one bit each for R, G, B),
* but have to translate them, anyway. */
static const u8 col_trans[8] = {
0, 6, 4, 5,
2, 7, 3, 1
};
#define c_fg(sti, c) col_trans[((c>> 8) & 7)]
#define c_bg(sti, c) col_trans[((c>>11) & 7)]
#define c_index(sti, c) ((c) & 0xff)
static const struct sti_init_flags default_init_flags = {
.wait = STI_WAIT,
.reset = 1,
.text = 1,
.nontext = 1,
.no_chg_bet = 1,
.no_chg_bei = 1,
.init_cmap_tx = 1,
};
static int sti_init_graph(struct sti_struct *sti)
{
struct sti_init_inptr *inptr = &sti->sti_data->init_inptr;
struct sti_init_inptr_ext *inptr_ext = &sti->sti_data->init_inptr_ext;
struct sti_init_outptr *outptr = &sti->sti_data->init_outptr;
unsigned long flags;
int ret, err;
spin_lock_irqsave(&sti->lock, flags);
memset(inptr, 0, sizeof(*inptr));
inptr->text_planes = 3; /* # of text planes (max 3 for STI) */
memset(inptr_ext, 0, sizeof(*inptr_ext));
store_sti_ptr(sti, &inptr->ext_ptr, inptr_ext);
outptr->errno = 0;
ret = sti_call(sti, sti->init_graph, &default_init_flags, inptr,
outptr, sti->glob_cfg);
if (ret >= 0)
sti->text_planes = outptr->text_planes;
err = outptr->errno;
spin_unlock_irqrestore(&sti->lock, flags);
if (ret < 0) {
pr_err("STI init_graph failed (ret %d, errno %d)\n", ret, err);
return -1;
}
return 0;
}
static const struct sti_conf_flags default_conf_flags = {
.wait = STI_WAIT,
};
static void sti_inq_conf(struct sti_struct *sti)
{
struct sti_conf_inptr *inptr = &sti->sti_data->inq_inptr;
struct sti_conf_outptr *outptr = &sti->sti_data->inq_outptr;
unsigned long flags;
s32 ret;
store_sti_ptr(sti, &outptr->ext_ptr, &sti->sti_data->inq_outptr_ext);
do {
spin_lock_irqsave(&sti->lock, flags);
memset(inptr, 0, sizeof(*inptr));
ret = sti_call(sti, sti->inq_conf, &default_conf_flags,
inptr, outptr, sti->glob_cfg);
spin_unlock_irqrestore(&sti->lock, flags);
} while (ret == 1);
}
static const struct sti_font_flags default_font_flags = {
.wait = STI_WAIT,
.non_text = 0,
};
void
sti_putc(struct sti_struct *sti, int c, int y, int x,
struct sti_cooked_font *font)
{
struct sti_font_inptr *inptr;
struct sti_font_inptr inptr_default = {
.font_start_addr = (void *)STI_PTR(font->raw),
.index = c_index(sti, c),
.fg_color = c_fg(sti, c),
.bg_color = c_bg(sti, c),
.dest_x = x * font->width,
.dest_y = y * font->height,
};
struct sti_font_outptr *outptr = &sti->sti_data->font_outptr;
s32 ret;
unsigned long flags;
do {
spin_lock_irqsave(&sti->lock, flags);
inptr = &inptr_default;
if (IS_ENABLED(CONFIG_64BIT) && !sti->do_call64) {
/* copy below 4G if calling 32-bit on LP64 kernel */
inptr = &sti->sti_data->font_inptr;
*inptr = inptr_default;
/* skip first 4 bytes for 32-bit STI call */
inptr = (void *)(((unsigned long)inptr) + sizeof(u32));
}
ret = sti_call(sti, sti->font_unpmv, &default_font_flags,
inptr, outptr, sti->glob_cfg);
spin_unlock_irqrestore(&sti->lock, flags);
} while (ret == 1);
}
static const struct sti_blkmv_flags clear_blkmv_flags = {
.wait = STI_WAIT,
.color = 1,
.clear = 1,
};
void
sti_set(struct sti_struct *sti, int src_y, int src_x,
int height, int width, u8 color)
{
struct sti_blkmv_inptr *inptr;
struct sti_blkmv_inptr inptr_default = {
.fg_color = color,
.bg_color = color,
.src_x = src_x,
.src_y = src_y,
.dest_x = src_x,
.dest_y = src_y,
.width = width,
.height = height,
};
struct sti_blkmv_outptr *outptr = &sti->sti_data->blkmv_outptr;
s32 ret;
unsigned long flags;
do {
spin_lock_irqsave(&sti->lock, flags);
inptr = &inptr_default;
if (IS_ENABLED(CONFIG_64BIT) && !sti->do_call64) {
/* copy below 4G if calling 32-bit on LP64 kernel */
inptr = &sti->sti_data->blkmv_inptr;
*inptr = inptr_default;
}
ret = sti_call(sti, sti->block_move, &clear_blkmv_flags,
inptr, outptr, sti->glob_cfg);
spin_unlock_irqrestore(&sti->lock, flags);
} while (ret == 1);
}
void
sti_clear(struct sti_struct *sti, int src_y, int src_x,
int height, int width, int c, struct sti_cooked_font *font)
{
struct sti_blkmv_inptr *inptr;
struct sti_blkmv_inptr inptr_default = {
.fg_color = c_fg(sti, c),
.bg_color = c_bg(sti, c),
.src_x = src_x * font->width,
.src_y = src_y * font->height,
.dest_x = src_x * font->width,
.dest_y = src_y * font->height,
.width = width * font->width,
.height = height * font->height,
};
struct sti_blkmv_outptr *outptr = &sti->sti_data->blkmv_outptr;
s32 ret;
unsigned long flags;
do {
spin_lock_irqsave(&sti->lock, flags);
inptr = &inptr_default;
if (IS_ENABLED(CONFIG_64BIT) && !sti->do_call64) {
/* copy below 4G if calling 32-bit on LP64 kernel */
inptr = &sti->sti_data->blkmv_inptr;
*inptr = inptr_default;
}
ret = sti_call(sti, sti->block_move, &clear_blkmv_flags,
inptr, outptr, sti->glob_cfg);
spin_unlock_irqrestore(&sti->lock, flags);
} while (ret == 1);
}
static const struct sti_blkmv_flags default_blkmv_flags = {
.wait = STI_WAIT,
};
void
sti_bmove(struct sti_struct *sti, int src_y, int src_x,
int dst_y, int dst_x, int height, int width,
struct sti_cooked_font *font)
{
struct sti_blkmv_inptr *inptr;
struct sti_blkmv_inptr inptr_default = {
.src_x = src_x * font->width,
.src_y = src_y * font->height,
.dest_x = dst_x * font->width,
.dest_y = dst_y * font->height,
.width = width * font->width,
.height = height * font->height,
};
struct sti_blkmv_outptr *outptr = &sti->sti_data->blkmv_outptr;
s32 ret;
unsigned long flags;
do {
spin_lock_irqsave(&sti->lock, flags);
inptr = &inptr_default;
if (IS_ENABLED(CONFIG_64BIT) && !sti->do_call64) {
/* copy below 4G if calling 32-bit on LP64 kernel */
inptr = &sti->sti_data->blkmv_inptr;
*inptr = inptr_default;
}
ret = sti_call(sti, sti->block_move, &default_blkmv_flags,
inptr, outptr, sti->glob_cfg);
spin_unlock_irqrestore(&sti->lock, flags);
} while (ret == 1);
}
static void sti_flush(unsigned long start, unsigned long end)
{
flush_icache_range(start, end);
}
static void sti_rom_copy(unsigned long base, unsigned long count, void *dest)
{
unsigned long dest_start = (unsigned long) dest;
/* this still needs to be revisited (see arch/parisc/mm/init.c:246) ! */
while (count >= 4) {
count -= 4;
*(u32 *)dest = gsc_readl(base);
base += 4;
dest += 4;
}
while (count) {
count--;
*(u8 *)dest = gsc_readb(base);
base++;
dest++;
}
sti_flush(dest_start, (unsigned long)dest);
}
static char default_sti_path[21] __read_mostly;
#ifndef MODULE
static int __init sti_setup(char *str)
{
if (str)
strscpy(default_sti_path, str, sizeof(default_sti_path));
return 1;
}
/* Assuming the machine has multiple STI consoles (=graphic cards) which
* all get detected by sticon, the user may define with the linux kernel
* parameter sti=<x> which of them will be the initial boot-console.
* <x> is a number between 0 and MAX_STI_ROMS, with 0 as the default
* STI screen.
*/
__setup("sti=", sti_setup);
#endif
static char *font_name;
static int font_index,
font_height,
font_width;
#ifndef MODULE
static int sti_font_setup(char *str)
{
/*
* The default font can be selected in various ways.
* a) sti_font=VGA8x16, sti_font=10x20, sti_font=10*20 selects
* an built-in Linux framebuffer font.
* b) sti_font=<index>, where index is (1..x) with 1 selecting
* the first HP STI ROM built-in font..
*/
if (*str >= '0' && *str <= '9') {
char *x;
if ((x = strchr(str, 'x')) || (x = strchr(str, '*'))) {
font_height = simple_strtoul(str, NULL, 0);
font_width = simple_strtoul(x+1, NULL, 0);
} else {
font_index = simple_strtoul(str, NULL, 0);
}
} else {
font_name = str; /* fb font name */
}
return 1;
}
/* The optional linux kernel parameter "sti_font" defines which font
* should be used by the sticon driver to draw characters to the screen.
* Possible values are:
* - sti_font=<fb_fontname>:
* <fb_fontname> is the name of one of the linux-kernel built-in
* framebuffer font names (e.g. VGA8x16, SUN22x18).
* This is only available if the fonts have been statically compiled
* in with e.g. the CONFIG_FONT_8x16 or CONFIG_FONT_SUN12x22 options.
* - sti_font=<number> (<number> = 1,2,3,...)
* most STI ROMs have built-in HP specific fonts, which can be selected
* by giving the desired number to the sticon driver.
* NOTE: This number is machine and STI ROM dependend.
* - sti_font=<height>x<width> (e.g. sti_font=16x8)
* <height> and <width> gives hints to the height and width of the
* font which the user wants. The sticon driver will try to use
* a font with this height and width, but if no suitable font is
* found, sticon will use the default 8x8 font.
*/
__setup("sti_font=", sti_font_setup);
#endif
static void sti_dump_globcfg(struct sti_struct *sti)
{
struct sti_glob_cfg *glob_cfg = sti->glob_cfg;
struct sti_glob_cfg_ext *cfg = &sti->sti_data->glob_cfg_ext;
pr_debug("%d text planes\n"
"%4d x %4d screen resolution\n"
"%4d x %4d offscreen\n"
"%4d x %4d layout\n",
glob_cfg->text_planes,
glob_cfg->onscreen_x, glob_cfg->onscreen_y,
glob_cfg->offscreen_x, glob_cfg->offscreen_y,
glob_cfg->total_x, glob_cfg->total_y);
/* dump extended cfg */
pr_debug("monitor %d\n"
"in friendly mode: %d\n"
"power consumption %d watts\n"
"freq ref %d\n"
"sti_mem_addr %px (size=%d bytes)\n",
cfg->curr_mon,
cfg->friendly_boot,
cfg->power,
cfg->freq_ref,
cfg->sti_mem_addr, sti->sti_mem_request);
}
static void sti_dump_outptr(struct sti_struct *sti)
{
pr_debug("%d bits per pixel\n"
"%d used bits\n"
"%d planes\n"
"attributes %08x\n",
sti->sti_data->inq_outptr.bits_per_pixel,
sti->sti_data->inq_outptr.bits_used,
sti->sti_data->inq_outptr.planes,
sti->sti_data->inq_outptr.attributes);
}
static int sti_init_glob_cfg(struct sti_struct *sti, unsigned long rom_address,
unsigned long hpa)
{
struct sti_glob_cfg *glob_cfg;
struct sti_glob_cfg_ext *glob_cfg_ext;
void *save_addr, *ptr;
void *sti_mem_addr;
int i, size;
if (sti->sti_mem_request < 256)
sti->sti_mem_request = 256; /* STI default */
size = sizeof(struct sti_all_data) + sti->sti_mem_request - 256;
sti->sti_data = kzalloc(size, STI_LOWMEM);
if (!sti->sti_data)
return -ENOMEM;
glob_cfg = &sti->sti_data->glob_cfg;
glob_cfg_ext = &sti->sti_data->glob_cfg_ext;
save_addr = &sti->sti_data->save_addr;
sti_mem_addr = &sti->sti_data->sti_mem_addr;
for (i = 0; i < STI_REGION_MAX; i++) {
unsigned long newhpa, len;
if (sti->pd) {
unsigned char offs = sti->rm_entry[i];
if (offs == 0)
continue;
if (offs != PCI_ROM_ADDRESS &&
(offs < PCI_BASE_ADDRESS_0 ||
offs > PCI_BASE_ADDRESS_5)) {
pr_warn("STI pci region mapping for region %d (%02x) can't be mapped\n",
i,sti->rm_entry[i]);
continue;
}
newhpa = pci_resource_start (sti->pd, (offs - PCI_BASE_ADDRESS_0) / 4);
} else
newhpa = (i == 0) ? rom_address : hpa;
sti->regions_phys[i] =
REGION_OFFSET_TO_PHYS(sti->regions[i], newhpa);
len = sti->regions[i].region_desc.length * 4096;
pr_debug("region #%d: phys %08lx, len=%lukB, "
"btlb=%d, sysonly=%d, cache=%d, last=%d\n",
i, sti->regions_phys[i], len / 1024,
sti->regions[i].region_desc.btlb,
sti->regions[i].region_desc.sys_only,
sti->regions[i].region_desc.cache,
sti->regions[i].region_desc.last);
/* last entry reached ? */
if (sti->regions[i].region_desc.last)
break;
}
ptr = &glob_cfg->region_ptrs;
for (i = 0; i < STI_REGION_MAX; i++)
ptr = store_sti_val(sti, ptr, sti->regions_phys[i]);
*(s32 *)ptr = 0; /* set reent_lvl */
ptr += sizeof(s32);
ptr = store_sti_ptr(sti, ptr, save_addr);
ptr = store_sti_ptr(sti, ptr, glob_cfg_ext);
store_sti_ptr(sti, &glob_cfg_ext->sti_mem_addr, sti_mem_addr);
sti->glob_cfg = glob_cfg;
return 0;
}
#ifdef CONFIG_FONT_SUPPORT
static struct sti_cooked_font *
sti_select_fbfont(struct sti_cooked_rom *cooked_rom, const char *fbfont_name)
{
const struct font_desc *fbfont = NULL;
unsigned int size, bpc;
void *dest;
struct sti_rom_font *nf;
struct sti_cooked_font *cooked_font;
if (fbfont_name && strlen(fbfont_name))
fbfont = find_font(fbfont_name);
if (!fbfont)
fbfont = get_default_font(1024,768, ~(u32)0, ~(u32)0);
if (!fbfont)
return NULL;
pr_info(" using %ux%u framebuffer font %s\n",
fbfont->width, fbfont->height, fbfont->name);
bpc = ((fbfont->width+7)/8) * fbfont->height;
size = bpc * fbfont->charcount;
size += sizeof(struct sti_rom_font);
nf = kzalloc(size, STI_LOWMEM);
if (!nf)
return NULL;
nf->first_char = 0;
nf->last_char = fbfont->charcount - 1;
nf->width = fbfont->width;
nf->height = fbfont->height;
nf->font_type = STI_FONT_HPROMAN8;
nf->bytes_per_char = bpc;
nf->next_font = 0;
nf->underline_height = 1;
nf->underline_pos = fbfont->height - nf->underline_height;
dest = nf;
dest += sizeof(struct sti_rom_font);
memcpy(dest, fbfont->data, bpc * fbfont->charcount);
cooked_font = kzalloc(sizeof(*cooked_font), GFP_KERNEL);
if (!cooked_font) {
kfree(nf);
return NULL;
}
cooked_font->raw = nf;
cooked_font->raw_ptr = nf;
cooked_font->next_font = NULL;
cooked_rom->font_start = cooked_font;
return cooked_font;
}
#else
static struct sti_cooked_font *
sti_select_fbfont(struct sti_cooked_rom *cooked_rom, const char *fbfont_name)
{
return NULL;
}
#endif
static void sti_dump_font(struct sti_cooked_font *font)
{
#ifdef STI_DUMP_FONT
unsigned char *p = (unsigned char *)font->raw;
int n;
p += sizeof(struct sti_rom_font);
pr_debug(" w %d h %d bpc %d\n", font->width, font->height,
font->raw->bytes_per_char);
for (n = 0; n < 256 * font->raw->bytes_per_char; n += 16, p += 16) {
pr_debug(" 0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x,"
" 0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x,"
" 0x%02x, 0x%02x, 0x%02x, 0x%02x,\n",
p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8],
p[9], p[10], p[11], p[12], p[13], p[14], p[15]);
}
#endif
}
static int sti_search_font(struct sti_cooked_rom *rom, int height, int width)
{
struct sti_cooked_font *font;
int i = 0;
for (font = rom->font_start; font; font = font->next_font, i++) {
if ((font->raw->width == width) &&
(font->raw->height == height))
return i;
}
return 0;
}
static struct sti_cooked_font *sti_select_font(struct sti_cooked_rom *rom)
{
struct sti_cooked_font *font;
int i;
/* check for framebuffer-font first */
if (!font_index) {
font = sti_select_fbfont(rom, font_name);
if (font)
return font;
}
if (font_width && font_height)
font_index = sti_search_font(rom,
font_height, font_width);
for (font = rom->font_start, i = font_index - 1;
font && (i > 0);
font = font->next_font, i--);
if (font)
return font;
else
return rom->font_start;
}
static void sti_dump_rom(struct sti_struct *sti)
{
struct sti_rom *rom = sti->rom->raw;
struct sti_cooked_font *font_start;
int nr;
pr_info(" id %04x-%04x, conforms to spec rev. %d.%02x\n",
rom->graphics_id[0],
rom->graphics_id[1],
rom->revno[0] >> 4,
rom->revno[0] & 0x0f);
pr_debug(" supports %d monitors\n", rom->num_mons);
pr_debug(" font start %08x\n", rom->font_start);
pr_debug(" region list %08x\n", rom->region_list);
pr_debug(" init_graph %08x\n", rom->init_graph);
pr_debug(" bus support %02x\n", rom->bus_support);
pr_debug(" ext bus support %02x\n", rom->ext_bus_support);
pr_debug(" alternate code type %d\n", rom->alt_code_type);
font_start = sti->rom->font_start;
nr = 0;
while (font_start) {
struct sti_rom_font *f = font_start->raw;
pr_info(" built-in font #%d: size %dx%d, chars %d-%d, bpc %d\n", ++nr,
f->width, f->height,
f->first_char, f->last_char, f->bytes_per_char);
font_start = font_start->next_font;
}
}
static int sti_cook_fonts(struct sti_cooked_rom *cooked_rom,
struct sti_rom *raw_rom)
{
struct sti_rom_font *raw_font, *font_start;
struct sti_cooked_font *cooked_font;
cooked_font = kzalloc(sizeof(*cooked_font), GFP_KERNEL);
if (!cooked_font)
return 0;
cooked_rom->font_start = cooked_font;
raw_font = ((void *)raw_rom) + (raw_rom->font_start);
font_start = raw_font;
cooked_font->raw = raw_font;
while (raw_font->next_font) {
raw_font = ((void *)font_start) + (raw_font->next_font);
cooked_font->next_font = kzalloc(sizeof(*cooked_font), GFP_KERNEL);
if (!cooked_font->next_font)
return 1;
cooked_font = cooked_font->next_font;
cooked_font->raw = raw_font;
}
cooked_font->next_font = NULL;
return 1;
}
#define BMODE_RELOCATE(offset) offset = (offset) / 4;
#define BMODE_LAST_ADDR_OFFS 0x50
void sti_font_convert_bytemode(struct sti_struct *sti, struct sti_cooked_font *f)
{
unsigned char *n, *p, *q;
int size = f->raw->bytes_per_char * (f->raw->last_char + 1) + sizeof(struct sti_rom_font);
struct sti_rom_font *old_font;
if (sti->wordmode)
return;
old_font = f->raw_ptr;
n = kcalloc(4, size, STI_LOWMEM);
f->raw_ptr = n;
if (!n)
return;
p = n + 3;
q = (unsigned char *) f->raw;
while (size--) {
*p = *q++;
p += 4;
}
/* store new ptr to byte-mode font and delete old font */
f->raw = (struct sti_rom_font *) (n + 3);
kfree(old_font);
}
EXPORT_SYMBOL(sti_font_convert_bytemode);
static void sti_bmode_rom_copy(unsigned long base, unsigned long count,
void *dest)
{
unsigned long dest_start = (unsigned long) dest;
while (count) {
count--;
*(u8 *)dest = gsc_readl(base);
base += 4;
dest++;
}
sti_flush(dest_start, (unsigned long)dest);
}
static struct sti_rom *sti_get_bmode_rom (unsigned long address)
{
struct sti_rom *raw;
u32 size;
struct sti_rom_font *raw_font, *font_start;
sti_bmode_rom_copy(address + BMODE_LAST_ADDR_OFFS, sizeof(size), &size);
size = (size+3) / 4;
raw = kmalloc(size, STI_LOWMEM);
if (raw) {
sti_bmode_rom_copy(address, size, raw);
memmove (&raw->res004, &raw->type[0], 0x3c);
raw->type[3] = raw->res004;
BMODE_RELOCATE (raw->region_list);
BMODE_RELOCATE (raw->font_start);
BMODE_RELOCATE (raw->init_graph);
BMODE_RELOCATE (raw->state_mgmt);
BMODE_RELOCATE (raw->font_unpmv);
BMODE_RELOCATE (raw->block_move);
BMODE_RELOCATE (raw->inq_conf);
raw_font = ((void *)raw) + raw->font_start;
font_start = raw_font;
while (raw_font->next_font) {
BMODE_RELOCATE (raw_font->next_font);
raw_font = ((void *)font_start) + raw_font->next_font;
}
}
return raw;
}
static struct sti_rom *sti_get_wmode_rom(unsigned long address)
{
struct sti_rom *raw;
unsigned long size;
/* read the ROM size directly from the struct in ROM */
size = gsc_readl(address + offsetof(struct sti_rom,last_addr));
raw = kmalloc(size, STI_LOWMEM);
if (raw)
sti_rom_copy(address, size, raw);
return raw;
}
static int sti_read_rom(int wordmode, struct sti_struct *sti,
unsigned long address)
{
struct sti_cooked_rom *cooked;
struct sti_rom *raw = NULL;
unsigned long revno;
cooked = kmalloc(sizeof *cooked, GFP_KERNEL);
if (!cooked)
goto out_err;
if (wordmode)
raw = sti_get_wmode_rom (address);
else
raw = sti_get_bmode_rom (address);
if (!raw)
goto out_err;
if (!sti_cook_fonts(cooked, raw)) {
pr_warn("No font found for STI at %08lx\n", address);
goto out_err;
}
if (raw->region_list)
memcpy(sti->regions, ((void *)raw)+raw->region_list, sizeof(sti->regions));
address = (unsigned long) STI_PTR(raw);
pr_info("STI %s ROM supports 32 %sbit firmware functions.\n",
wordmode ? "word mode" : "byte mode",
raw->alt_code_type == ALT_CODE_TYPE_PA_RISC_64
? "and 64 " : "");
if (IS_ENABLED(CONFIG_64BIT) &&
raw->alt_code_type == ALT_CODE_TYPE_PA_RISC_64) {
sti->do_call64 = 1;
sti->font_unpmv = address + (raw->font_unp_addr & 0x03ffffff);
sti->block_move = address + (raw->block_move_addr & 0x03ffffff);
sti->init_graph = address + (raw->init_graph_addr & 0x03ffffff);
sti->inq_conf = address + (raw->inq_conf_addr & 0x03ffffff);
} else {
sti->font_unpmv = address + (raw->font_unpmv & 0x03ffffff);
sti->block_move = address + (raw->block_move & 0x03ffffff);
sti->init_graph = address + (raw->init_graph & 0x03ffffff);
sti->inq_conf = address + (raw->inq_conf & 0x03ffffff);
}
sti->rom = cooked;
sti->rom->raw = raw;
sti_dump_rom(sti);
sti->wordmode = wordmode;
sti->font = sti_select_font(sti->rom);
sti->font->width = sti->font->raw->width;
sti->font->height = sti->font->raw->height;
sti_font_convert_bytemode(sti, sti->font);
sti_dump_font(sti->font);
pr_info(" using %d-bit STI ROM functions\n",
(IS_ENABLED(CONFIG_64BIT) && sti->do_call64) ? 64 : 32);
sti->sti_mem_request = raw->sti_mem_req;
pr_debug(" mem_request = %d, reentsize %d\n",
sti->sti_mem_request, raw->reentsize);
sti->graphics_id[0] = raw->graphics_id[0];
sti->graphics_id[1] = raw->graphics_id[1];
/* check if the ROM routines in this card are compatible */
if (wordmode || sti->graphics_id[1] != 0x09A02587)
goto ok;
revno = (raw->revno[0] << 8) | raw->revno[1];
switch (sti->graphics_id[0]) {
case S9000_ID_HCRX:
/* HyperA or HyperB ? */
if (revno == 0x8408 || revno == 0x840b)
goto msg_not_supported;
break;
case CRT_ID_THUNDER:
if (revno == 0x8509)
goto msg_not_supported;
break;
case CRT_ID_THUNDER2:
if (revno == 0x850c)
goto msg_not_supported;
}
ok:
return 1;
msg_not_supported:
pr_warn("Sorry, this GSC/STI card is not yet supported.\n");
pr_warn("Please see https://parisc.wiki.kernel.org/"
"index.php/Graphics_howto for more info.\n");
/* fall through */
out_err:
kfree(raw);
kfree(cooked);
return 0;
}
static struct sti_struct *sti_try_rom_generic(unsigned long address,
unsigned long hpa,
struct pci_dev *pd)
{
struct sti_struct *sti;
int ok;
u32 sig;
if (num_sti_roms >= MAX_STI_ROMS) {
pr_warn("maximum number of STI ROMS reached !\n");
return NULL;
}
sti = kzalloc(sizeof(*sti), GFP_KERNEL);
if (!sti)
return NULL;
spin_lock_init(&sti->lock);
test_rom:
/* pdc_add_valid() works only on 32-bit kernels */
if ((!IS_ENABLED(CONFIG_64BIT) ||
(boot_cpu_data.pdc.capabilities & PDC_MODEL_OS32)) &&
pdc_add_valid(address)) {
goto out_err;
}
sig = gsc_readl(address);
/* check for a PCI ROM structure */
if ((le32_to_cpu(sig)==0xaa55)) {
unsigned int i, rm_offset;
u32 *rm;
i = gsc_readl(address+0x04);
if (i != 1) {
/* The ROM could have multiple architecture
* dependent images (e.g. i386, parisc,...) */
pr_warn("PCI ROM is not a STI ROM type image (0x%8x)\n", i);
goto out_err;
}
sti->pd = pd;
i = gsc_readl(address+0x0c);
pr_debug("PCI ROM size (from header) = %d kB\n",
le16_to_cpu(i>>16)*512/1024);
rm_offset = le16_to_cpu(i & 0xffff);
if (rm_offset) {
/* read 16 bytes from the pci region mapper array */
rm = (u32*) &sti->rm_entry;
*rm++ = gsc_readl(address+rm_offset+0x00);
*rm++ = gsc_readl(address+rm_offset+0x04);
*rm++ = gsc_readl(address+rm_offset+0x08);
*rm++ = gsc_readl(address+rm_offset+0x0c);
}
address += le32_to_cpu(gsc_readl(address+8));
pr_debug("sig %04x, PCI STI ROM at %08lx\n", sig, address);
goto test_rom;
}
ok = 0;
if ((sig & 0xff) == 0x01) {
pr_debug(" byte mode ROM at %08lx, hpa at %08lx\n",
address, hpa);
ok = sti_read_rom(0, sti, address);
}
if ((sig & 0xffff) == 0x0303) {
pr_debug(" word mode ROM at %08lx, hpa at %08lx\n",
address, hpa);
ok = sti_read_rom(1, sti, address);
}
if (!ok)
goto out_err;
if (sti_init_glob_cfg(sti, address, hpa))
goto out_err; /* not enough memory */
/* disable STI PCI ROM. ROM and card RAM overlap and
* leaving it enabled would force HPMCs
*/
if (sti->pd) {
unsigned long rom_base;
rom_base = pci_resource_start(sti->pd, PCI_ROM_RESOURCE);
pci_write_config_dword(sti->pd, PCI_ROM_ADDRESS, rom_base & ~PCI_ROM_ADDRESS_ENABLE);
pr_debug("STI PCI ROM disabled\n");
}
if (sti_init_graph(sti))
goto out_err;
sti_inq_conf(sti);
sti_dump_globcfg(sti);
sti_dump_outptr(sti);
pr_info(" graphics card name: %s\n",
sti->sti_data->inq_outptr.dev_name);
sti_roms[num_sti_roms] = sti;
num_sti_roms++;
return sti;
out_err:
kfree(sti);
return NULL;
}
static void sticore_check_for_default_sti(struct sti_struct *sti, char *path)
{
pr_info(" located at [%s]\n", sti->pa_path);
if (strcmp (path, default_sti_path) == 0)
default_sti = sti;
}
/*
* on newer systems PDC gives the address of the ROM
* in the additional address field addr[1] while on
* older Systems the PDC stores it in page0->proc_sti
*/
static int __init sticore_pa_init(struct parisc_device *dev)
{
struct sti_struct *sti = NULL;
int hpa = dev->hpa.start;
if (dev->num_addrs && dev->addr[0])
sti = sti_try_rom_generic(dev->addr[0], hpa, NULL);
if (!sti)
sti = sti_try_rom_generic(hpa, hpa, NULL);
if (!sti)
sti = sti_try_rom_generic(PAGE0->proc_sti, hpa, NULL);
if (!sti)
return 1;
print_pa_hwpath(dev, sti->pa_path);
sticore_check_for_default_sti(sti, sti->pa_path);
return 0;
}
static int sticore_pci_init(struct pci_dev *pd, const struct pci_device_id *ent)
{
#ifdef CONFIG_PCI
unsigned long fb_base, rom_base;
unsigned int fb_len, rom_len;
int err;
struct sti_struct *sti;
err = pci_enable_device(pd);
if (err < 0) {
dev_err(&pd->dev, "Cannot enable PCI device\n");
return err;
}
fb_base = pci_resource_start(pd, 0);
fb_len = pci_resource_len(pd, 0);
rom_base = pci_resource_start(pd, PCI_ROM_RESOURCE);
rom_len = pci_resource_len(pd, PCI_ROM_RESOURCE);
if (rom_base) {
pci_write_config_dword(pd, PCI_ROM_ADDRESS, rom_base | PCI_ROM_ADDRESS_ENABLE);
pr_debug("STI PCI ROM enabled at 0x%08lx\n", rom_base);
}
pr_info("STI PCI graphic ROM found at %08lx (%u kB), fb at %08lx (%u MB)\n",
rom_base, rom_len/1024, fb_base, fb_len/1024/1024);
pr_debug("Trying PCI STI ROM at %08lx, PCI hpa at %08lx\n",
rom_base, fb_base);
sti = sti_try_rom_generic(rom_base, fb_base, pd);
if (sti) {
print_pci_hwpath(pd, sti->pa_path);
sticore_check_for_default_sti(sti, sti->pa_path);
}
if (!sti) {
pr_warn("Unable to handle STI device '%s'\n", pci_name(pd));
return -ENODEV;
}
#endif /* CONFIG_PCI */
return 0;
}
static void __exit sticore_pci_remove(struct pci_dev *pd)
{
BUG();
}
static struct pci_device_id sti_pci_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_VISUALIZE_EG) },
{ PCI_DEVICE(PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_VISUALIZE_FX6) },
{ PCI_DEVICE(PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_VISUALIZE_FX4) },
{ PCI_DEVICE(PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_VISUALIZE_FX2) },
{ PCI_DEVICE(PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_VISUALIZE_FXE) },
{ 0, } /* terminate list */
};
MODULE_DEVICE_TABLE(pci, sti_pci_tbl);
static struct pci_driver pci_sti_driver = {
.name = "sti",
.id_table = sti_pci_tbl,
.probe = sticore_pci_init,
.remove = __exit_p(sticore_pci_remove),
};
static struct parisc_device_id sti_pa_tbl[] = {
{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00077 },
{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00085 },
{ 0, }
};
MODULE_DEVICE_TABLE(parisc, sti_pa_tbl);
static struct parisc_driver pa_sti_driver __refdata = {
.name = "sti",
.id_table = sti_pa_tbl,
.probe = sticore_pa_init,
};
/*
* sti_init_roms() - detects all STI ROMs and stores them in sti_roms[]
*/
static int sticore_initialized __read_mostly;
static void sti_init_roms(void)
{
if (sticore_initialized)
return;
sticore_initialized = 1;
pr_info("STI GSC/PCI core graphics driver "
STI_DRIVERVERSION "\n");
/* Register drivers for native & PCI cards */
register_parisc_driver(&pa_sti_driver);
WARN_ON(pci_register_driver(&pci_sti_driver));
/* if we didn't find the given default sti, take the first one */
if (!default_sti)
default_sti = sti_roms[0];
}
/*
* index = 0 gives default sti
* index > 0 gives other stis in detection order
*/
struct sti_struct * sti_get_rom(unsigned int index)
{
if (!sticore_initialized)
sti_init_roms();
if (index == 0)
return default_sti;
if (index > num_sti_roms)
return NULL;
return sti_roms[index-1];
}
EXPORT_SYMBOL(sti_get_rom);
int sti_call(const struct sti_struct *sti, unsigned long func,
const void *flags, void *inptr, void *outptr,
struct sti_glob_cfg *glob_cfg)
{
unsigned long _flags = STI_PTR(flags);
unsigned long _inptr = STI_PTR(inptr);
unsigned long _outptr = STI_PTR(outptr);
unsigned long _glob_cfg = STI_PTR(glob_cfg);
int ret;
/* Check for overflow when using 32bit STI on 64bit kernel. */
if (WARN_ONCE(IS_ENABLED(CONFIG_64BIT) && !sti->do_call64 &&
(upper_32_bits(_flags) || upper_32_bits(_inptr) ||
upper_32_bits(_outptr) || upper_32_bits(_glob_cfg)),
"Out of 32bit-range pointers!"))
return -1;
ret = pdc_sti_call(func, _flags, _inptr, _outptr, _glob_cfg,
sti->do_call64);
return ret;
}
MODULE_AUTHOR("Philipp Rumpf, Helge Deller, Thomas Bogendoerfer");
MODULE_DESCRIPTION("Core STI driver for HP's NGLE series graphics cards in HP PARISC machines");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/video/sticore.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Convert a logo in ASCII PNM format to C source suitable for inclusion in
* the Linux kernel
*
* (C) Copyright 2001-2003 by Geert Uytterhoeven <[email protected]>
*/
#include <ctype.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static const char *programname;
static const char *filename;
static const char *logoname = "linux_logo";
static const char *outputname;
static FILE *out;
#define LINUX_LOGO_MONO 1 /* monochrome black/white */
#define LINUX_LOGO_VGA16 2 /* 16 colors VGA text palette */
#define LINUX_LOGO_CLUT224 3 /* 224 colors */
#define LINUX_LOGO_GRAY256 4 /* 256 levels grayscale */
static const char *logo_types[LINUX_LOGO_GRAY256+1] = {
[LINUX_LOGO_MONO] = "LINUX_LOGO_MONO",
[LINUX_LOGO_VGA16] = "LINUX_LOGO_VGA16",
[LINUX_LOGO_CLUT224] = "LINUX_LOGO_CLUT224",
[LINUX_LOGO_GRAY256] = "LINUX_LOGO_GRAY256"
};
#define MAX_LINUX_LOGO_COLORS 224
struct color {
unsigned char red;
unsigned char green;
unsigned char blue;
};
static const struct color clut_vga16[16] = {
{ 0x00, 0x00, 0x00 },
{ 0x00, 0x00, 0xaa },
{ 0x00, 0xaa, 0x00 },
{ 0x00, 0xaa, 0xaa },
{ 0xaa, 0x00, 0x00 },
{ 0xaa, 0x00, 0xaa },
{ 0xaa, 0x55, 0x00 },
{ 0xaa, 0xaa, 0xaa },
{ 0x55, 0x55, 0x55 },
{ 0x55, 0x55, 0xff },
{ 0x55, 0xff, 0x55 },
{ 0x55, 0xff, 0xff },
{ 0xff, 0x55, 0x55 },
{ 0xff, 0x55, 0xff },
{ 0xff, 0xff, 0x55 },
{ 0xff, 0xff, 0xff },
};
static int logo_type = LINUX_LOGO_CLUT224;
static unsigned int logo_width;
static unsigned int logo_height;
static struct color **logo_data;
static struct color logo_clut[MAX_LINUX_LOGO_COLORS];
static unsigned int logo_clutsize;
static int is_plain_pbm = 0;
static void die(const char *fmt, ...)
__attribute__((noreturn)) __attribute((format (printf, 1, 2)));
static void usage(void) __attribute((noreturn));
static unsigned int get_number(FILE *fp)
{
int c, val;
/* Skip leading whitespace */
do {
c = fgetc(fp);
if (c == EOF)
die("%s: end of file\n", filename);
if (c == '#') {
/* Ignore comments 'till end of line */
do {
c = fgetc(fp);
if (c == EOF)
die("%s: end of file\n", filename);
} while (c != '\n');
}
} while (isspace(c));
/* Parse decimal number */
val = 0;
while (isdigit(c)) {
val = 10*val+c-'0';
/* some PBM are 'broken'; GiMP for example exports a PBM without space
* between the digits. This is Ok cause we know a PBM can only have a '1'
* or a '0' for the digit.
*/
if (is_plain_pbm)
break;
c = fgetc(fp);
if (c == EOF)
die("%s: end of file\n", filename);
}
return val;
}
static unsigned int get_number255(FILE *fp, unsigned int maxval)
{
unsigned int val = get_number(fp);
return (255*val+maxval/2)/maxval;
}
static void read_image(void)
{
FILE *fp;
unsigned int i, j;
int magic;
unsigned int maxval;
/* open image file */
fp = fopen(filename, "r");
if (!fp)
die("Cannot open file %s: %s\n", filename, strerror(errno));
/* check file type and read file header */
magic = fgetc(fp);
if (magic != 'P')
die("%s is not a PNM file\n", filename);
magic = fgetc(fp);
switch (magic) {
case '1':
case '2':
case '3':
/* Plain PBM/PGM/PPM */
break;
case '4':
case '5':
case '6':
/* Binary PBM/PGM/PPM */
die("%s: Binary PNM is not supported\n"
"Use pnmnoraw(1) to convert it to ASCII PNM\n", filename);
default:
die("%s is not a PNM file\n", filename);
}
logo_width = get_number(fp);
logo_height = get_number(fp);
/* allocate image data */
logo_data = (struct color **)malloc(logo_height*sizeof(struct color *));
if (!logo_data)
die("%s\n", strerror(errno));
for (i = 0; i < logo_height; i++) {
logo_data[i] = malloc(logo_width*sizeof(struct color));
if (!logo_data[i])
die("%s\n", strerror(errno));
}
/* read image data */
switch (magic) {
case '1':
/* Plain PBM */
is_plain_pbm = 1;
for (i = 0; i < logo_height; i++)
for (j = 0; j < logo_width; j++)
logo_data[i][j].red = logo_data[i][j].green =
logo_data[i][j].blue = 255*(1-get_number(fp));
break;
case '2':
/* Plain PGM */
maxval = get_number(fp);
for (i = 0; i < logo_height; i++)
for (j = 0; j < logo_width; j++)
logo_data[i][j].red = logo_data[i][j].green =
logo_data[i][j].blue = get_number255(fp, maxval);
break;
case '3':
/* Plain PPM */
maxval = get_number(fp);
for (i = 0; i < logo_height; i++)
for (j = 0; j < logo_width; j++) {
logo_data[i][j].red = get_number255(fp, maxval);
logo_data[i][j].green = get_number255(fp, maxval);
logo_data[i][j].blue = get_number255(fp, maxval);
}
break;
}
/* close file */
fclose(fp);
}
static inline int is_black(struct color c)
{
return c.red == 0 && c.green == 0 && c.blue == 0;
}
static inline int is_white(struct color c)
{
return c.red == 255 && c.green == 255 && c.blue == 255;
}
static inline int is_gray(struct color c)
{
return c.red == c.green && c.red == c.blue;
}
static inline int is_equal(struct color c1, struct color c2)
{
return c1.red == c2.red && c1.green == c2.green && c1.blue == c2.blue;
}
static void write_header(void)
{
/* open logo file */
if (outputname) {
out = fopen(outputname, "w");
if (!out)
die("Cannot create file %s: %s\n", outputname, strerror(errno));
} else {
out = stdout;
}
fputs("/*\n", out);
fputs(" * DO NOT EDIT THIS FILE!\n", out);
fputs(" *\n", out);
fprintf(out, " * It was automatically generated from %s\n", filename);
fputs(" *\n", out);
fprintf(out, " * Linux logo %s\n", logoname);
fputs(" */\n\n", out);
fputs("#include <linux/linux_logo.h>\n\n", out);
fprintf(out, "static unsigned char %s_data[] __initdata = {\n",
logoname);
}
static void write_footer(void)
{
fputs("\n};\n\n", out);
fprintf(out, "const struct linux_logo %s __initconst = {\n", logoname);
fprintf(out, "\t.type\t\t= %s,\n", logo_types[logo_type]);
fprintf(out, "\t.width\t\t= %d,\n", logo_width);
fprintf(out, "\t.height\t\t= %d,\n", logo_height);
if (logo_type == LINUX_LOGO_CLUT224) {
fprintf(out, "\t.clutsize\t= %d,\n", logo_clutsize);
fprintf(out, "\t.clut\t\t= %s_clut,\n", logoname);
}
fprintf(out, "\t.data\t\t= %s_data\n", logoname);
fputs("};\n\n", out);
/* close logo file */
if (outputname)
fclose(out);
}
static int write_hex_cnt;
static void write_hex(unsigned char byte)
{
if (write_hex_cnt % 12)
fprintf(out, ", 0x%02x", byte);
else if (write_hex_cnt)
fprintf(out, ",\n\t0x%02x", byte);
else
fprintf(out, "\t0x%02x", byte);
write_hex_cnt++;
}
static void write_logo_mono(void)
{
unsigned int i, j;
unsigned char val, bit;
/* validate image */
for (i = 0; i < logo_height; i++)
for (j = 0; j < logo_width; j++)
if (!is_black(logo_data[i][j]) && !is_white(logo_data[i][j]))
die("Image must be monochrome\n");
/* write file header */
write_header();
/* write logo data */
for (i = 0; i < logo_height; i++) {
for (j = 0; j < logo_width;) {
for (val = 0, bit = 0x80; bit && j < logo_width; j++, bit >>= 1)
if (logo_data[i][j].red)
val |= bit;
write_hex(val);
}
}
/* write logo structure and file footer */
write_footer();
}
static void write_logo_vga16(void)
{
unsigned int i, j, k;
unsigned char val;
/* validate image */
for (i = 0; i < logo_height; i++)
for (j = 0; j < logo_width; j++) {
for (k = 0; k < 16; k++)
if (is_equal(logo_data[i][j], clut_vga16[k]))
break;
if (k == 16)
die("Image must use the 16 console colors only\n"
"Use ppmquant(1) -map clut_vga16.ppm to reduce the number "
"of colors\n");
}
/* write file header */
write_header();
/* write logo data */
for (i = 0; i < logo_height; i++)
for (j = 0; j < logo_width; j++) {
for (k = 0; k < 16; k++)
if (is_equal(logo_data[i][j], clut_vga16[k]))
break;
val = k<<4;
if (++j < logo_width) {
for (k = 0; k < 16; k++)
if (is_equal(logo_data[i][j], clut_vga16[k]))
break;
val |= k;
}
write_hex(val);
}
/* write logo structure and file footer */
write_footer();
}
static void write_logo_clut224(void)
{
unsigned int i, j, k;
/* validate image */
for (i = 0; i < logo_height; i++)
for (j = 0; j < logo_width; j++) {
for (k = 0; k < logo_clutsize; k++)
if (is_equal(logo_data[i][j], logo_clut[k]))
break;
if (k == logo_clutsize) {
if (logo_clutsize == MAX_LINUX_LOGO_COLORS)
die("Image has more than %d colors\n"
"Use ppmquant(1) to reduce the number of colors\n",
MAX_LINUX_LOGO_COLORS);
logo_clut[logo_clutsize++] = logo_data[i][j];
}
}
/* write file header */
write_header();
/* write logo data */
for (i = 0; i < logo_height; i++)
for (j = 0; j < logo_width; j++) {
for (k = 0; k < logo_clutsize; k++)
if (is_equal(logo_data[i][j], logo_clut[k]))
break;
write_hex(k+32);
}
fputs("\n};\n\n", out);
/* write logo clut */
fprintf(out, "static unsigned char %s_clut[] __initdata = {\n",
logoname);
write_hex_cnt = 0;
for (i = 0; i < logo_clutsize; i++) {
write_hex(logo_clut[i].red);
write_hex(logo_clut[i].green);
write_hex(logo_clut[i].blue);
}
/* write logo structure and file footer */
write_footer();
}
static void write_logo_gray256(void)
{
unsigned int i, j;
/* validate image */
for (i = 0; i < logo_height; i++)
for (j = 0; j < logo_width; j++)
if (!is_gray(logo_data[i][j]))
die("Image must be grayscale\n");
/* write file header */
write_header();
/* write logo data */
for (i = 0; i < logo_height; i++)
for (j = 0; j < logo_width; j++)
write_hex(logo_data[i][j].red);
/* write logo structure and file footer */
write_footer();
}
static void die(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
exit(1);
}
static void usage(void)
{
die("\n"
"Usage: %s [options] <filename>\n"
"\n"
"Valid options:\n"
" -h : display this usage information\n"
" -n <name> : specify logo name (default: linux_logo)\n"
" -o <output> : output to file <output> instead of stdout\n"
" -t <type> : specify logo type, one of\n"
" mono : monochrome black/white\n"
" vga16 : 16 colors VGA text palette\n"
" clut224 : 224 colors (default)\n"
" gray256 : 256 levels grayscale\n"
"\n", programname);
}
int main(int argc, char *argv[])
{
int opt;
programname = argv[0];
opterr = 0;
while (1) {
opt = getopt(argc, argv, "hn:o:t:");
if (opt == -1)
break;
switch (opt) {
case 'h':
usage();
break;
case 'n':
logoname = optarg;
break;
case 'o':
outputname = optarg;
break;
case 't':
if (!strcmp(optarg, "mono"))
logo_type = LINUX_LOGO_MONO;
else if (!strcmp(optarg, "vga16"))
logo_type = LINUX_LOGO_VGA16;
else if (!strcmp(optarg, "clut224"))
logo_type = LINUX_LOGO_CLUT224;
else if (!strcmp(optarg, "gray256"))
logo_type = LINUX_LOGO_GRAY256;
else
usage();
break;
default:
usage();
break;
}
}
if (optind != argc-1)
usage();
filename = argv[optind];
read_image();
switch (logo_type) {
case LINUX_LOGO_MONO:
write_logo_mono();
break;
case LINUX_LOGO_VGA16:
write_logo_vga16();
break;
case LINUX_LOGO_CLUT224:
write_logo_clut224();
break;
case LINUX_LOGO_GRAY256:
write_logo_gray256();
break;
}
exit(0);
}
| linux-master | drivers/video/logo/pnmtologo.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Linux logo to be displayed on boot
*
* Copyright (C) 1996 Larry Ewing ([email protected])
* Copyright (C) 1996,1998 Jakub Jelinek ([email protected])
* Copyright (C) 2001 Greg Banks <[email protected]>
* Copyright (C) 2001 Jan-Benedict Glaw <[email protected]>
* Copyright (C) 2003 Geert Uytterhoeven <[email protected]>
*/
#include <linux/linux_logo.h>
#include <linux/stddef.h>
#include <linux/module.h>
#ifdef CONFIG_M68K
#include <asm/setup.h>
#endif
static bool nologo;
module_param(nologo, bool, 0);
MODULE_PARM_DESC(nologo, "Disables startup logo");
/*
* Logos are located in the initdata, and will be freed in kernel_init.
* Use late_init to mark the logos as freed to prevent any further use.
*/
static bool logos_freed;
static int __init fb_logo_late_init(void)
{
logos_freed = true;
return 0;
}
late_initcall_sync(fb_logo_late_init);
/* logo's are marked __initdata. Use __ref to tell
* modpost that it is intended that this function uses data
* marked __initdata.
*/
const struct linux_logo * __ref fb_find_logo(int depth)
{
const struct linux_logo *logo = NULL;
if (nologo || logos_freed)
return NULL;
if (depth >= 1) {
#ifdef CONFIG_LOGO_LINUX_MONO
/* Generic Linux logo */
logo = &logo_linux_mono;
#endif
#ifdef CONFIG_LOGO_SUPERH_MONO
/* SuperH Linux logo */
logo = &logo_superh_mono;
#endif
}
if (depth >= 4) {
#ifdef CONFIG_LOGO_LINUX_VGA16
/* Generic Linux logo */
logo = &logo_linux_vga16;
#endif
#ifdef CONFIG_LOGO_SUPERH_VGA16
/* SuperH Linux logo */
logo = &logo_superh_vga16;
#endif
}
if (depth >= 8) {
#ifdef CONFIG_LOGO_LINUX_CLUT224
/* Generic Linux logo */
logo = &logo_linux_clut224;
#endif
#ifdef CONFIG_LOGO_DEC_CLUT224
/* DEC Linux logo on MIPS/MIPS64 or ALPHA */
logo = &logo_dec_clut224;
#endif
#ifdef CONFIG_LOGO_MAC_CLUT224
/* Macintosh Linux logo on m68k */
if (MACH_IS_MAC)
logo = &logo_mac_clut224;
#endif
#ifdef CONFIG_LOGO_PARISC_CLUT224
/* PA-RISC Linux logo */
logo = &logo_parisc_clut224;
#endif
#ifdef CONFIG_LOGO_SGI_CLUT224
/* SGI Linux logo on MIPS/MIPS64 */
logo = &logo_sgi_clut224;
#endif
#ifdef CONFIG_LOGO_SUN_CLUT224
/* Sun Linux logo */
logo = &logo_sun_clut224;
#endif
#ifdef CONFIG_LOGO_SUPERH_CLUT224
/* SuperH Linux logo */
logo = &logo_superh_clut224;
#endif
}
return logo;
}
EXPORT_SYMBOL_GPL(fb_find_logo);
| linux-master | drivers/video/logo/logo.c |
// SPDX-License-Identifier: GPL-2.0-only
/* drivers/video/backlight/ili9320.c
*
* ILI9320 LCD controller driver core.
*
* Copyright 2007 Simtec Electronics
* http://armlinux.simtec.co.uk/
* Ben Dooks <[email protected]>
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/lcd.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <video/ili9320.h>
#include "ili9320.h"
static inline int ili9320_write_spi(struct ili9320 *ili,
unsigned int reg,
unsigned int value)
{
struct ili9320_spi *spi = &ili->access.spi;
unsigned char *addr = spi->buffer_addr;
unsigned char *data = spi->buffer_data;
/* spi message consits of:
* first byte: ID and operation
*/
addr[0] = spi->id | ILI9320_SPI_INDEX | ILI9320_SPI_WRITE;
addr[1] = reg >> 8;
addr[2] = reg;
/* second message is the data to transfer */
data[0] = spi->id | ILI9320_SPI_DATA | ILI9320_SPI_WRITE;
data[1] = value >> 8;
data[2] = value;
return spi_sync(spi->dev, &spi->message);
}
int ili9320_write(struct ili9320 *ili, unsigned int reg, unsigned int value)
{
dev_dbg(ili->dev, "write: reg=%02x, val=%04x\n", reg, value);
return ili->write(ili, reg, value);
}
EXPORT_SYMBOL_GPL(ili9320_write);
int ili9320_write_regs(struct ili9320 *ili,
const struct ili9320_reg *values,
int nr_values)
{
int index;
int ret;
for (index = 0; index < nr_values; index++, values++) {
ret = ili9320_write(ili, values->address, values->value);
if (ret != 0)
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(ili9320_write_regs);
static void ili9320_reset(struct ili9320 *lcd)
{
struct ili9320_platdata *cfg = lcd->platdata;
cfg->reset(1);
mdelay(50);
cfg->reset(0);
mdelay(50);
cfg->reset(1);
mdelay(100);
}
static inline int ili9320_init_chip(struct ili9320 *lcd)
{
int ret;
ili9320_reset(lcd);
ret = lcd->client->init(lcd, lcd->platdata);
if (ret != 0) {
dev_err(lcd->dev, "failed to initialise display\n");
return ret;
}
lcd->initialised = 1;
return 0;
}
static inline int ili9320_power_on(struct ili9320 *lcd)
{
if (!lcd->initialised)
ili9320_init_chip(lcd);
lcd->display1 |= (ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);
ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
return 0;
}
static inline int ili9320_power_off(struct ili9320 *lcd)
{
lcd->display1 &= ~(ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);
ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
return 0;
}
#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
static int ili9320_power(struct ili9320 *lcd, int power)
{
int ret = 0;
dev_dbg(lcd->dev, "power %d => %d\n", lcd->power, power);
if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
ret = ili9320_power_on(lcd);
else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
ret = ili9320_power_off(lcd);
if (ret == 0)
lcd->power = power;
else
dev_warn(lcd->dev, "failed to set power mode %d\n", power);
return ret;
}
static inline struct ili9320 *to_our_lcd(struct lcd_device *lcd)
{
return lcd_get_data(lcd);
}
static int ili9320_set_power(struct lcd_device *ld, int power)
{
struct ili9320 *lcd = to_our_lcd(ld);
return ili9320_power(lcd, power);
}
static int ili9320_get_power(struct lcd_device *ld)
{
struct ili9320 *lcd = to_our_lcd(ld);
return lcd->power;
}
static struct lcd_ops ili9320_ops = {
.get_power = ili9320_get_power,
.set_power = ili9320_set_power,
};
static void ili9320_setup_spi(struct ili9320 *ili,
struct spi_device *dev)
{
struct ili9320_spi *spi = &ili->access.spi;
ili->write = ili9320_write_spi;
spi->dev = dev;
/* fill the two messages we are going to use to send the data
* with, the first the address followed by the data. The datasheet
* says they should be done as two distinct cycles of the SPI CS line.
*/
spi->xfer[0].tx_buf = spi->buffer_addr;
spi->xfer[1].tx_buf = spi->buffer_data;
spi->xfer[0].len = 3;
spi->xfer[1].len = 3;
spi->xfer[0].bits_per_word = 8;
spi->xfer[1].bits_per_word = 8;
spi->xfer[0].cs_change = 1;
spi_message_init(&spi->message);
spi_message_add_tail(&spi->xfer[0], &spi->message);
spi_message_add_tail(&spi->xfer[1], &spi->message);
}
int ili9320_probe_spi(struct spi_device *spi,
struct ili9320_client *client)
{
struct ili9320_platdata *cfg = dev_get_platdata(&spi->dev);
struct device *dev = &spi->dev;
struct ili9320 *ili;
struct lcd_device *lcd;
int ret = 0;
/* verify we where given some information */
if (cfg == NULL) {
dev_err(dev, "no platform data supplied\n");
return -EINVAL;
}
if (cfg->hsize <= 0 || cfg->vsize <= 0 || cfg->reset == NULL) {
dev_err(dev, "invalid platform data supplied\n");
return -EINVAL;
}
/* allocate and initialse our state */
ili = devm_kzalloc(&spi->dev, sizeof(struct ili9320), GFP_KERNEL);
if (ili == NULL)
return -ENOMEM;
ili->access.spi.id = ILI9320_SPI_IDCODE | ILI9320_SPI_ID(1);
ili->dev = dev;
ili->client = client;
ili->power = FB_BLANK_POWERDOWN;
ili->platdata = cfg;
spi_set_drvdata(spi, ili);
ili9320_setup_spi(ili, spi);
lcd = devm_lcd_device_register(&spi->dev, "ili9320", dev, ili,
&ili9320_ops);
if (IS_ERR(lcd)) {
dev_err(dev, "failed to register lcd device\n");
return PTR_ERR(lcd);
}
ili->lcd = lcd;
dev_info(dev, "initialising %s\n", client->name);
ret = ili9320_power(ili, FB_BLANK_UNBLANK);
if (ret != 0) {
dev_err(dev, "failed to set lcd power state\n");
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(ili9320_probe_spi);
void ili9320_remove(struct ili9320 *ili)
{
ili9320_power(ili, FB_BLANK_POWERDOWN);
}
EXPORT_SYMBOL_GPL(ili9320_remove);
#ifdef CONFIG_PM_SLEEP
int ili9320_suspend(struct ili9320 *lcd)
{
int ret;
ret = ili9320_power(lcd, FB_BLANK_POWERDOWN);
if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP) {
ili9320_write(lcd, ILI9320_POWER1, lcd->power1 |
ILI9320_POWER1_SLP |
ILI9320_POWER1_DSTB);
lcd->initialised = 0;
}
return ret;
}
EXPORT_SYMBOL_GPL(ili9320_suspend);
int ili9320_resume(struct ili9320 *lcd)
{
dev_info(lcd->dev, "resuming from power state %d\n", lcd->power);
if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP)
ili9320_write(lcd, ILI9320_POWER1, 0x00);
return ili9320_power(lcd, FB_BLANK_UNBLANK);
}
EXPORT_SYMBOL_GPL(ili9320_resume);
#endif
/* Power down all displays on reboot, poweroff or halt */
void ili9320_shutdown(struct ili9320 *lcd)
{
ili9320_power(lcd, FB_BLANK_POWERDOWN);
}
EXPORT_SYMBOL_GPL(ili9320_shutdown);
MODULE_AUTHOR("Ben Dooks <[email protected]>");
MODULE_DESCRIPTION("ILI9320 LCD Driver");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/video/backlight/ili9320.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Power control for Samsung LTV350QV Quarter VGA LCD Panel
*
* Copyright (C) 2006, 2007 Atmel Corporation
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/lcd.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include "ltv350qv.h"
#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
struct ltv350qv {
struct spi_device *spi;
u8 *buffer;
int power;
struct lcd_device *ld;
};
/*
* The power-on and power-off sequences are taken from the
* LTV350QV-F04 data sheet from Samsung. The register definitions are
* taken from the S6F2002 command list also from Samsung.
*
* There's still some voodoo going on here, but it's a lot better than
* in the first incarnation of the driver where all we had was the raw
* numbers from the initialization sequence.
*/
static int ltv350qv_write_reg(struct ltv350qv *lcd, u8 reg, u16 val)
{
struct spi_message msg;
struct spi_transfer index_xfer = {
.len = 3,
.cs_change = 1,
};
struct spi_transfer value_xfer = {
.len = 3,
};
spi_message_init(&msg);
/* register index */
lcd->buffer[0] = LTV_OPC_INDEX;
lcd->buffer[1] = 0x00;
lcd->buffer[2] = reg & 0x7f;
index_xfer.tx_buf = lcd->buffer;
spi_message_add_tail(&index_xfer, &msg);
/* register value */
lcd->buffer[4] = LTV_OPC_DATA;
lcd->buffer[5] = val >> 8;
lcd->buffer[6] = val;
value_xfer.tx_buf = lcd->buffer + 4;
spi_message_add_tail(&value_xfer, &msg);
return spi_sync(lcd->spi, &msg);
}
/* The comments are taken straight from the data sheet */
static int ltv350qv_power_on(struct ltv350qv *lcd)
{
int ret;
/* Power On Reset Display off State */
if (ltv350qv_write_reg(lcd, LTV_PWRCTL1, 0x0000))
goto err;
usleep_range(15000, 16000);
/* Power Setting Function 1 */
if (ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE))
goto err;
if (ltv350qv_write_reg(lcd, LTV_PWRCTL2, LTV_VCOML_ENABLE))
goto err_power1;
/* Power Setting Function 2 */
if (ltv350qv_write_reg(lcd, LTV_PWRCTL1,
LTV_VCOM_DISABLE | LTV_DRIVE_CURRENT(5)
| LTV_SUPPLY_CURRENT(5)))
goto err_power2;
msleep(55);
/* Instruction Setting */
ret = ltv350qv_write_reg(lcd, LTV_IFCTL,
LTV_NMD | LTV_REV | LTV_NL(0x1d));
ret |= ltv350qv_write_reg(lcd, LTV_DATACTL,
LTV_DS_SAME | LTV_CHS_480
| LTV_DF_RGB | LTV_RGB_BGR);
ret |= ltv350qv_write_reg(lcd, LTV_ENTRY_MODE,
LTV_VSPL_ACTIVE_LOW
| LTV_HSPL_ACTIVE_LOW
| LTV_DPL_SAMPLE_RISING
| LTV_EPL_ACTIVE_LOW
| LTV_SS_RIGHT_TO_LEFT);
ret |= ltv350qv_write_reg(lcd, LTV_GATECTL1, LTV_CLW(3));
ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2,
LTV_NW_INV_1LINE | LTV_FWI(3));
ret |= ltv350qv_write_reg(lcd, LTV_VBP, 0x000a);
ret |= ltv350qv_write_reg(lcd, LTV_HBP, 0x0021);
ret |= ltv350qv_write_reg(lcd, LTV_SOTCTL, LTV_SDT(3) | LTV_EQ(0));
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(0), 0x0103);
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(1), 0x0301);
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(2), 0x1f0f);
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(3), 0x1f0f);
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(4), 0x0707);
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(5), 0x0307);
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(6), 0x0707);
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(7), 0x0000);
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(8), 0x0004);
ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(9), 0x0000);
if (ret)
goto err_settings;
/* Wait more than 2 frames */
msleep(20);
/* Display On Sequence */
ret = ltv350qv_write_reg(lcd, LTV_PWRCTL1,
LTV_VCOM_DISABLE | LTV_VCOMOUT_ENABLE
| LTV_POWER_ON | LTV_DRIVE_CURRENT(5)
| LTV_SUPPLY_CURRENT(5));
ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2,
LTV_NW_INV_1LINE | LTV_DSC | LTV_FWI(3));
if (ret)
goto err_disp_on;
/* Display should now be ON. Phew. */
return 0;
err_disp_on:
/*
* Try to recover. Error handling probably isn't very useful
* at this point, just make a best effort to switch the panel
* off.
*/
ltv350qv_write_reg(lcd, LTV_PWRCTL1,
LTV_VCOM_DISABLE | LTV_DRIVE_CURRENT(5)
| LTV_SUPPLY_CURRENT(5));
ltv350qv_write_reg(lcd, LTV_GATECTL2,
LTV_NW_INV_1LINE | LTV_FWI(3));
err_settings:
err_power2:
err_power1:
ltv350qv_write_reg(lcd, LTV_PWRCTL2, 0x0000);
usleep_range(1000, 1100);
err:
ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE);
return -EIO;
}
static int ltv350qv_power_off(struct ltv350qv *lcd)
{
int ret;
/* Display Off Sequence */
ret = ltv350qv_write_reg(lcd, LTV_PWRCTL1,
LTV_VCOM_DISABLE
| LTV_DRIVE_CURRENT(5)
| LTV_SUPPLY_CURRENT(5));
ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2,
LTV_NW_INV_1LINE | LTV_FWI(3));
/* Power down setting 1 */
ret |= ltv350qv_write_reg(lcd, LTV_PWRCTL2, 0x0000);
/* Wait at least 1 ms */
usleep_range(1000, 1100);
/* Power down setting 2 */
ret |= ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE);
/*
* No point in trying to recover here. If we can't switch the
* panel off, what are we supposed to do other than inform the
* user about the failure?
*/
if (ret)
return -EIO;
/* Display power should now be OFF */
return 0;
}
static int ltv350qv_power(struct ltv350qv *lcd, int power)
{
int ret = 0;
if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
ret = ltv350qv_power_on(lcd);
else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
ret = ltv350qv_power_off(lcd);
if (!ret)
lcd->power = power;
return ret;
}
static int ltv350qv_set_power(struct lcd_device *ld, int power)
{
struct ltv350qv *lcd = lcd_get_data(ld);
return ltv350qv_power(lcd, power);
}
static int ltv350qv_get_power(struct lcd_device *ld)
{
struct ltv350qv *lcd = lcd_get_data(ld);
return lcd->power;
}
static struct lcd_ops ltv_ops = {
.get_power = ltv350qv_get_power,
.set_power = ltv350qv_set_power,
};
static int ltv350qv_probe(struct spi_device *spi)
{
struct ltv350qv *lcd;
struct lcd_device *ld;
int ret;
lcd = devm_kzalloc(&spi->dev, sizeof(struct ltv350qv), GFP_KERNEL);
if (!lcd)
return -ENOMEM;
lcd->spi = spi;
lcd->power = FB_BLANK_POWERDOWN;
lcd->buffer = devm_kzalloc(&spi->dev, 8, GFP_KERNEL);
if (!lcd->buffer)
return -ENOMEM;
ld = devm_lcd_device_register(&spi->dev, "ltv350qv", &spi->dev, lcd,
<v_ops);
if (IS_ERR(ld))
return PTR_ERR(ld);
lcd->ld = ld;
ret = ltv350qv_power(lcd, FB_BLANK_UNBLANK);
if (ret)
return ret;
spi_set_drvdata(spi, lcd);
return 0;
}
static void ltv350qv_remove(struct spi_device *spi)
{
struct ltv350qv *lcd = spi_get_drvdata(spi);
ltv350qv_power(lcd, FB_BLANK_POWERDOWN);
}
#ifdef CONFIG_PM_SLEEP
static int ltv350qv_suspend(struct device *dev)
{
struct ltv350qv *lcd = dev_get_drvdata(dev);
return ltv350qv_power(lcd, FB_BLANK_POWERDOWN);
}
static int ltv350qv_resume(struct device *dev)
{
struct ltv350qv *lcd = dev_get_drvdata(dev);
return ltv350qv_power(lcd, FB_BLANK_UNBLANK);
}
#endif
static SIMPLE_DEV_PM_OPS(ltv350qv_pm_ops, ltv350qv_suspend, ltv350qv_resume);
/* Power down all displays on reboot, poweroff or halt */
static void ltv350qv_shutdown(struct spi_device *spi)
{
struct ltv350qv *lcd = spi_get_drvdata(spi);
ltv350qv_power(lcd, FB_BLANK_POWERDOWN);
}
static struct spi_driver ltv350qv_driver = {
.driver = {
.name = "ltv350qv",
.pm = <v350qv_pm_ops,
},
.probe = ltv350qv_probe,
.remove = ltv350qv_remove,
.shutdown = ltv350qv_shutdown,
};
module_spi_driver(ltv350qv_driver);
MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
MODULE_DESCRIPTION("Samsung LTV350QV LCD Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:ltv350qv");
| linux-master | drivers/video/backlight/ltv350qv.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Backlight Lowlevel Control Abstraction
*
* Copyright (C) 2003,2004 Hewlett-Packard Company
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/backlight.h>
#include <linux/notifier.h>
#include <linux/ctype.h>
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/slab.h>
#ifdef CONFIG_PMAC_BACKLIGHT
#include <asm/backlight.h>
#endif
/**
* DOC: overview
*
* The backlight core supports implementing backlight drivers.
*
* A backlight driver registers a driver using
* devm_backlight_device_register(). The properties of the backlight
* driver such as type and max_brightness must be specified.
* When the core detect changes in for example brightness or power state
* the update_status() operation is called. The backlight driver shall
* implement this operation and use it to adjust backlight.
*
* Several sysfs attributes are provided by the backlight core::
*
* - brightness R/W, set the requested brightness level
* - actual_brightness RO, the brightness level used by the HW
* - max_brightness RO, the maximum brightness level supported
*
* See Documentation/ABI/stable/sysfs-class-backlight for the full list.
*
* The backlight can be adjusted using the sysfs interface, and
* the backlight driver may also support adjusting backlight using
* a hot-key or some other platform or firmware specific way.
*
* The driver must implement the get_brightness() operation if
* the HW do not support all the levels that can be specified in
* brightness, thus providing user-space access to the actual level
* via the actual_brightness attribute.
*
* When the backlight changes this is reported to user-space using
* an uevent connected to the actual_brightness attribute.
* When brightness is set by platform specific means, for example
* a hot-key to adjust backlight, the driver must notify the backlight
* core that brightness has changed using backlight_force_update().
*
* The backlight driver core receives notifications from fbdev and
* if the event is FB_EVENT_BLANK and if the value of blank, from the
* FBIOBLANK ioctrl, results in a change in the backlight state the
* update_status() operation is called.
*/
static struct list_head backlight_dev_list;
static struct mutex backlight_dev_list_mutex;
static struct blocking_notifier_head backlight_notifier;
static const char *const backlight_types[] = {
[BACKLIGHT_RAW] = "raw",
[BACKLIGHT_PLATFORM] = "platform",
[BACKLIGHT_FIRMWARE] = "firmware",
};
static const char *const backlight_scale_types[] = {
[BACKLIGHT_SCALE_UNKNOWN] = "unknown",
[BACKLIGHT_SCALE_LINEAR] = "linear",
[BACKLIGHT_SCALE_NON_LINEAR] = "non-linear",
};
#if defined(CONFIG_FB_CORE) || (defined(CONFIG_FB_CORE_MODULE) && \
defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE))
/*
* fb_notifier_callback
*
* This callback gets called when something important happens inside a
* framebuffer driver. The backlight core only cares about FB_BLANK_UNBLANK
* which is reported to the driver using backlight_update_status()
* as a state change.
*
* There may be several fbdev's connected to the backlight device,
* in which case they are kept track of. A state change is only reported
* if there is a change in backlight for the specified fbdev.
*/
static int fb_notifier_callback(struct notifier_block *self,
unsigned long event, void *data)
{
struct backlight_device *bd;
struct fb_event *evdata = data;
int node = evdata->info->node;
int fb_blank = 0;
/* If we aren't interested in this event, skip it immediately ... */
if (event != FB_EVENT_BLANK)
return 0;
bd = container_of(self, struct backlight_device, fb_notif);
mutex_lock(&bd->ops_lock);
if (!bd->ops)
goto out;
if (bd->ops->check_fb && !bd->ops->check_fb(bd, evdata->info))
goto out;
fb_blank = *(int *)evdata->data;
if (fb_blank == FB_BLANK_UNBLANK && !bd->fb_bl_on[node]) {
bd->fb_bl_on[node] = true;
if (!bd->use_count++) {
bd->props.state &= ~BL_CORE_FBBLANK;
bd->props.fb_blank = FB_BLANK_UNBLANK;
backlight_update_status(bd);
}
} else if (fb_blank != FB_BLANK_UNBLANK && bd->fb_bl_on[node]) {
bd->fb_bl_on[node] = false;
if (!(--bd->use_count)) {
bd->props.state |= BL_CORE_FBBLANK;
bd->props.fb_blank = fb_blank;
backlight_update_status(bd);
}
}
out:
mutex_unlock(&bd->ops_lock);
return 0;
}
static int backlight_register_fb(struct backlight_device *bd)
{
memset(&bd->fb_notif, 0, sizeof(bd->fb_notif));
bd->fb_notif.notifier_call = fb_notifier_callback;
return fb_register_client(&bd->fb_notif);
}
static void backlight_unregister_fb(struct backlight_device *bd)
{
fb_unregister_client(&bd->fb_notif);
}
#else
static inline int backlight_register_fb(struct backlight_device *bd)
{
return 0;
}
static inline void backlight_unregister_fb(struct backlight_device *bd)
{
}
#endif /* CONFIG_FB_CORE */
static void backlight_generate_event(struct backlight_device *bd,
enum backlight_update_reason reason)
{
char *envp[2];
switch (reason) {
case BACKLIGHT_UPDATE_SYSFS:
envp[0] = "SOURCE=sysfs";
break;
case BACKLIGHT_UPDATE_HOTKEY:
envp[0] = "SOURCE=hotkey";
break;
default:
envp[0] = "SOURCE=unknown";
break;
}
envp[1] = NULL;
kobject_uevent_env(&bd->dev.kobj, KOBJ_CHANGE, envp);
sysfs_notify(&bd->dev.kobj, NULL, "actual_brightness");
}
static ssize_t bl_power_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct backlight_device *bd = to_backlight_device(dev);
return sprintf(buf, "%d\n", bd->props.power);
}
static ssize_t bl_power_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int rc;
struct backlight_device *bd = to_backlight_device(dev);
unsigned long power, old_power;
rc = kstrtoul(buf, 0, &power);
if (rc)
return rc;
rc = -ENXIO;
mutex_lock(&bd->ops_lock);
if (bd->ops) {
pr_debug("set power to %lu\n", power);
if (bd->props.power != power) {
old_power = bd->props.power;
bd->props.power = power;
rc = backlight_update_status(bd);
if (rc)
bd->props.power = old_power;
else
rc = count;
} else {
rc = count;
}
}
mutex_unlock(&bd->ops_lock);
return rc;
}
static DEVICE_ATTR_RW(bl_power);
static ssize_t brightness_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct backlight_device *bd = to_backlight_device(dev);
return sprintf(buf, "%d\n", bd->props.brightness);
}
int backlight_device_set_brightness(struct backlight_device *bd,
unsigned long brightness)
{
int rc = -ENXIO;
mutex_lock(&bd->ops_lock);
if (bd->ops) {
if (brightness > bd->props.max_brightness)
rc = -EINVAL;
else {
pr_debug("set brightness to %lu\n", brightness);
bd->props.brightness = brightness;
rc = backlight_update_status(bd);
}
}
mutex_unlock(&bd->ops_lock);
backlight_generate_event(bd, BACKLIGHT_UPDATE_SYSFS);
return rc;
}
EXPORT_SYMBOL(backlight_device_set_brightness);
static ssize_t brightness_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
int rc;
struct backlight_device *bd = to_backlight_device(dev);
unsigned long brightness;
rc = kstrtoul(buf, 0, &brightness);
if (rc)
return rc;
rc = backlight_device_set_brightness(bd, brightness);
return rc ? rc : count;
}
static DEVICE_ATTR_RW(brightness);
static ssize_t type_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct backlight_device *bd = to_backlight_device(dev);
return sprintf(buf, "%s\n", backlight_types[bd->props.type]);
}
static DEVICE_ATTR_RO(type);
static ssize_t max_brightness_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct backlight_device *bd = to_backlight_device(dev);
return sprintf(buf, "%d\n", bd->props.max_brightness);
}
static DEVICE_ATTR_RO(max_brightness);
static ssize_t actual_brightness_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int rc = -ENXIO;
struct backlight_device *bd = to_backlight_device(dev);
mutex_lock(&bd->ops_lock);
if (bd->ops && bd->ops->get_brightness) {
rc = bd->ops->get_brightness(bd);
if (rc >= 0)
rc = sprintf(buf, "%d\n", rc);
} else {
rc = sprintf(buf, "%d\n", bd->props.brightness);
}
mutex_unlock(&bd->ops_lock);
return rc;
}
static DEVICE_ATTR_RO(actual_brightness);
static ssize_t scale_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct backlight_device *bd = to_backlight_device(dev);
if (WARN_ON(bd->props.scale > BACKLIGHT_SCALE_NON_LINEAR))
return sprintf(buf, "unknown\n");
return sprintf(buf, "%s\n", backlight_scale_types[bd->props.scale]);
}
static DEVICE_ATTR_RO(scale);
static struct class *backlight_class;
#ifdef CONFIG_PM_SLEEP
static int backlight_suspend(struct device *dev)
{
struct backlight_device *bd = to_backlight_device(dev);
mutex_lock(&bd->ops_lock);
if (bd->ops && bd->ops->options & BL_CORE_SUSPENDRESUME) {
bd->props.state |= BL_CORE_SUSPENDED;
backlight_update_status(bd);
}
mutex_unlock(&bd->ops_lock);
return 0;
}
static int backlight_resume(struct device *dev)
{
struct backlight_device *bd = to_backlight_device(dev);
mutex_lock(&bd->ops_lock);
if (bd->ops && bd->ops->options & BL_CORE_SUSPENDRESUME) {
bd->props.state &= ~BL_CORE_SUSPENDED;
backlight_update_status(bd);
}
mutex_unlock(&bd->ops_lock);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(backlight_class_dev_pm_ops, backlight_suspend,
backlight_resume);
static void bl_device_release(struct device *dev)
{
struct backlight_device *bd = to_backlight_device(dev);
kfree(bd);
}
static struct attribute *bl_device_attrs[] = {
&dev_attr_bl_power.attr,
&dev_attr_brightness.attr,
&dev_attr_actual_brightness.attr,
&dev_attr_max_brightness.attr,
&dev_attr_scale.attr,
&dev_attr_type.attr,
NULL,
};
ATTRIBUTE_GROUPS(bl_device);
/**
* backlight_force_update - tell the backlight subsystem that hardware state
* has changed
* @bd: the backlight device to update
* @reason: reason for update
*
* Updates the internal state of the backlight in response to a hardware event,
* and generates an uevent to notify userspace. A backlight driver shall call
* backlight_force_update() when the backlight is changed using, for example,
* a hot-key. The updated brightness is read using get_brightness() and the
* brightness value is reported using an uevent.
*/
void backlight_force_update(struct backlight_device *bd,
enum backlight_update_reason reason)
{
int brightness;
mutex_lock(&bd->ops_lock);
if (bd->ops && bd->ops->get_brightness) {
brightness = bd->ops->get_brightness(bd);
if (brightness >= 0)
bd->props.brightness = brightness;
else
dev_err(&bd->dev,
"Could not update brightness from device: %pe\n",
ERR_PTR(brightness));
}
mutex_unlock(&bd->ops_lock);
backlight_generate_event(bd, reason);
}
EXPORT_SYMBOL(backlight_force_update);
/* deprecated - use devm_backlight_device_register() */
struct backlight_device *backlight_device_register(const char *name,
struct device *parent, void *devdata, const struct backlight_ops *ops,
const struct backlight_properties *props)
{
struct backlight_device *new_bd;
int rc;
pr_debug("backlight_device_register: name=%s\n", name);
new_bd = kzalloc(sizeof(struct backlight_device), GFP_KERNEL);
if (!new_bd)
return ERR_PTR(-ENOMEM);
mutex_init(&new_bd->update_lock);
mutex_init(&new_bd->ops_lock);
new_bd->dev.class = backlight_class;
new_bd->dev.parent = parent;
new_bd->dev.release = bl_device_release;
dev_set_name(&new_bd->dev, "%s", name);
dev_set_drvdata(&new_bd->dev, devdata);
/* Set default properties */
if (props) {
memcpy(&new_bd->props, props,
sizeof(struct backlight_properties));
if (props->type <= 0 || props->type >= BACKLIGHT_TYPE_MAX) {
WARN(1, "%s: invalid backlight type", name);
new_bd->props.type = BACKLIGHT_RAW;
}
} else {
new_bd->props.type = BACKLIGHT_RAW;
}
rc = device_register(&new_bd->dev);
if (rc) {
put_device(&new_bd->dev);
return ERR_PTR(rc);
}
rc = backlight_register_fb(new_bd);
if (rc) {
device_unregister(&new_bd->dev);
return ERR_PTR(rc);
}
new_bd->ops = ops;
#ifdef CONFIG_PMAC_BACKLIGHT
mutex_lock(&pmac_backlight_mutex);
if (!pmac_backlight)
pmac_backlight = new_bd;
mutex_unlock(&pmac_backlight_mutex);
#endif
mutex_lock(&backlight_dev_list_mutex);
list_add(&new_bd->entry, &backlight_dev_list);
mutex_unlock(&backlight_dev_list_mutex);
blocking_notifier_call_chain(&backlight_notifier,
BACKLIGHT_REGISTERED, new_bd);
return new_bd;
}
EXPORT_SYMBOL(backlight_device_register);
/** backlight_device_get_by_type - find first backlight device of a type
* @type: the type of backlight device
*
* Look up the first backlight device of the specified type
*
* RETURNS:
*
* Pointer to backlight device if any was found. Otherwise NULL.
*/
struct backlight_device *backlight_device_get_by_type(enum backlight_type type)
{
bool found = false;
struct backlight_device *bd;
mutex_lock(&backlight_dev_list_mutex);
list_for_each_entry(bd, &backlight_dev_list, entry) {
if (bd->props.type == type) {
found = true;
break;
}
}
mutex_unlock(&backlight_dev_list_mutex);
return found ? bd : NULL;
}
EXPORT_SYMBOL(backlight_device_get_by_type);
/**
* backlight_device_get_by_name - Get backlight device by name
* @name: Device name
*
* This function looks up a backlight device by its name. It obtains a reference
* on the backlight device and it is the caller's responsibility to drop the
* reference by calling put_device().
*
* Returns:
* A pointer to the backlight device if found, otherwise NULL.
*/
struct backlight_device *backlight_device_get_by_name(const char *name)
{
struct device *dev;
dev = class_find_device_by_name(backlight_class, name);
return dev ? to_backlight_device(dev) : NULL;
}
EXPORT_SYMBOL(backlight_device_get_by_name);
/* deprecated - use devm_backlight_device_unregister() */
void backlight_device_unregister(struct backlight_device *bd)
{
if (!bd)
return;
mutex_lock(&backlight_dev_list_mutex);
list_del(&bd->entry);
mutex_unlock(&backlight_dev_list_mutex);
#ifdef CONFIG_PMAC_BACKLIGHT
mutex_lock(&pmac_backlight_mutex);
if (pmac_backlight == bd)
pmac_backlight = NULL;
mutex_unlock(&pmac_backlight_mutex);
#endif
blocking_notifier_call_chain(&backlight_notifier,
BACKLIGHT_UNREGISTERED, bd);
mutex_lock(&bd->ops_lock);
bd->ops = NULL;
mutex_unlock(&bd->ops_lock);
backlight_unregister_fb(bd);
device_unregister(&bd->dev);
}
EXPORT_SYMBOL(backlight_device_unregister);
static void devm_backlight_device_release(struct device *dev, void *res)
{
struct backlight_device *backlight = *(struct backlight_device **)res;
backlight_device_unregister(backlight);
}
static int devm_backlight_device_match(struct device *dev, void *res,
void *data)
{
struct backlight_device **r = res;
return *r == data;
}
/**
* backlight_register_notifier - get notified of backlight (un)registration
* @nb: notifier block with the notifier to call on backlight (un)registration
*
* Register a notifier to get notified when backlight devices get registered
* or unregistered.
*
* RETURNS:
*
* 0 on success, otherwise a negative error code
*/
int backlight_register_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&backlight_notifier, nb);
}
EXPORT_SYMBOL(backlight_register_notifier);
/**
* backlight_unregister_notifier - unregister a backlight notifier
* @nb: notifier block to unregister
*
* Register a notifier to get notified when backlight devices get registered
* or unregistered.
*
* RETURNS:
*
* 0 on success, otherwise a negative error code
*/
int backlight_unregister_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_unregister(&backlight_notifier, nb);
}
EXPORT_SYMBOL(backlight_unregister_notifier);
/**
* devm_backlight_device_register - register a new backlight device
* @dev: the device to register
* @name: the name of the device
* @parent: a pointer to the parent device (often the same as @dev)
* @devdata: an optional pointer to be stored for private driver use
* @ops: the backlight operations structure
* @props: the backlight properties
*
* Creates and registers new backlight device. When a backlight device
* is registered the configuration must be specified in the @props
* parameter. See description of &backlight_properties.
*
* RETURNS:
*
* struct backlight on success, or an ERR_PTR on error
*/
struct backlight_device *devm_backlight_device_register(struct device *dev,
const char *name, struct device *parent, void *devdata,
const struct backlight_ops *ops,
const struct backlight_properties *props)
{
struct backlight_device **ptr, *backlight;
ptr = devres_alloc(devm_backlight_device_release, sizeof(*ptr),
GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
backlight = backlight_device_register(name, parent, devdata, ops,
props);
if (!IS_ERR(backlight)) {
*ptr = backlight;
devres_add(dev, ptr);
} else {
devres_free(ptr);
}
return backlight;
}
EXPORT_SYMBOL(devm_backlight_device_register);
/**
* devm_backlight_device_unregister - unregister backlight device
* @dev: the device to unregister
* @bd: the backlight device to unregister
*
* Deallocates a backlight allocated with devm_backlight_device_register().
* Normally this function will not need to be called and the resource management
* code will ensure that the resources are freed.
*/
void devm_backlight_device_unregister(struct device *dev,
struct backlight_device *bd)
{
int rc;
rc = devres_release(dev, devm_backlight_device_release,
devm_backlight_device_match, bd);
WARN_ON(rc);
}
EXPORT_SYMBOL(devm_backlight_device_unregister);
#ifdef CONFIG_OF
static int of_parent_match(struct device *dev, const void *data)
{
return dev->parent && dev->parent->of_node == data;
}
/**
* of_find_backlight_by_node() - find backlight device by device-tree node
* @node: device-tree node of the backlight device
*
* Returns a pointer to the backlight device corresponding to the given DT
* node or NULL if no such backlight device exists or if the device hasn't
* been probed yet.
*
* This function obtains a reference on the backlight device and it is the
* caller's responsibility to drop the reference by calling put_device() on
* the backlight device's .dev field.
*/
struct backlight_device *of_find_backlight_by_node(struct device_node *node)
{
struct device *dev;
dev = class_find_device(backlight_class, NULL, node, of_parent_match);
return dev ? to_backlight_device(dev) : NULL;
}
EXPORT_SYMBOL(of_find_backlight_by_node);
#endif
static struct backlight_device *of_find_backlight(struct device *dev)
{
struct backlight_device *bd = NULL;
struct device_node *np;
if (!dev)
return NULL;
if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
np = of_parse_phandle(dev->of_node, "backlight", 0);
if (np) {
bd = of_find_backlight_by_node(np);
of_node_put(np);
if (!bd)
return ERR_PTR(-EPROBE_DEFER);
}
}
return bd;
}
static void devm_backlight_release(void *data)
{
struct backlight_device *bd = data;
put_device(&bd->dev);
}
/**
* devm_of_find_backlight - find backlight for a device
* @dev: the device
*
* This function looks for a property named 'backlight' on the DT node
* connected to @dev and looks up the backlight device. The lookup is
* device managed so the reference to the backlight device is automatically
* dropped on driver detach.
*
* RETURNS:
*
* A pointer to the backlight device if found.
* Error pointer -EPROBE_DEFER if the DT property is set, but no backlight
* device is found. NULL if there's no backlight property.
*/
struct backlight_device *devm_of_find_backlight(struct device *dev)
{
struct backlight_device *bd;
int ret;
bd = of_find_backlight(dev);
if (IS_ERR_OR_NULL(bd))
return bd;
ret = devm_add_action_or_reset(dev, devm_backlight_release, bd);
if (ret)
return ERR_PTR(ret);
return bd;
}
EXPORT_SYMBOL(devm_of_find_backlight);
static void __exit backlight_class_exit(void)
{
class_destroy(backlight_class);
}
static int __init backlight_class_init(void)
{
backlight_class = class_create("backlight");
if (IS_ERR(backlight_class)) {
pr_warn("Unable to create backlight class; errno = %ld\n",
PTR_ERR(backlight_class));
return PTR_ERR(backlight_class);
}
backlight_class->dev_groups = bl_device_groups;
backlight_class->pm = &backlight_class_dev_pm_ops;
INIT_LIST_HEAD(&backlight_dev_list);
mutex_init(&backlight_dev_list_mutex);
BLOCKING_INIT_NOTIFIER_HEAD(&backlight_notifier);
return 0;
}
/*
* if this is compiled into the kernel, we need to ensure that the
* class is registered before users of the class try to register lcd's
*/
postcore_initcall(backlight_class_init);
module_exit(backlight_class_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jamey Hicks <[email protected]>, Andrew Zabolotny <[email protected]>");
MODULE_DESCRIPTION("Backlight Lowlevel Control Abstraction");
| linux-master | drivers/video/backlight/backlight.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* tps65217_bl.c
*
* TPS65217 backlight driver
*
* Copyright (C) 2012 Matthias Kaehlcke
* Author: Matthias Kaehlcke <[email protected]>
*/
#include <linux/kernel.h>
#include <linux/backlight.h>
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/mfd/tps65217.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
struct tps65217_bl {
struct tps65217 *tps;
struct device *dev;
struct backlight_device *bl;
bool is_enabled;
};
static int tps65217_bl_enable(struct tps65217_bl *tps65217_bl)
{
int rc;
rc = tps65217_set_bits(tps65217_bl->tps, TPS65217_REG_WLEDCTRL1,
TPS65217_WLEDCTRL1_ISINK_ENABLE,
TPS65217_WLEDCTRL1_ISINK_ENABLE, TPS65217_PROTECT_NONE);
if (rc) {
dev_err(tps65217_bl->dev,
"failed to enable backlight: %d\n", rc);
return rc;
}
tps65217_bl->is_enabled = true;
dev_dbg(tps65217_bl->dev, "backlight enabled\n");
return 0;
}
static int tps65217_bl_disable(struct tps65217_bl *tps65217_bl)
{
int rc;
rc = tps65217_clear_bits(tps65217_bl->tps,
TPS65217_REG_WLEDCTRL1,
TPS65217_WLEDCTRL1_ISINK_ENABLE,
TPS65217_PROTECT_NONE);
if (rc) {
dev_err(tps65217_bl->dev,
"failed to disable backlight: %d\n", rc);
return rc;
}
tps65217_bl->is_enabled = false;
dev_dbg(tps65217_bl->dev, "backlight disabled\n");
return 0;
}
static int tps65217_bl_update_status(struct backlight_device *bl)
{
struct tps65217_bl *tps65217_bl = bl_get_data(bl);
int rc;
int brightness = backlight_get_brightness(bl);
if (brightness > 0) {
rc = tps65217_reg_write(tps65217_bl->tps,
TPS65217_REG_WLEDCTRL2,
brightness - 1,
TPS65217_PROTECT_NONE);
if (rc) {
dev_err(tps65217_bl->dev,
"failed to set brightness level: %d\n", rc);
return rc;
}
dev_dbg(tps65217_bl->dev, "brightness set to %d\n", brightness);
if (!tps65217_bl->is_enabled)
rc = tps65217_bl_enable(tps65217_bl);
} else {
rc = tps65217_bl_disable(tps65217_bl);
}
return rc;
}
static const struct backlight_ops tps65217_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = tps65217_bl_update_status,
};
static int tps65217_bl_hw_init(struct tps65217_bl *tps65217_bl,
struct tps65217_bl_pdata *pdata)
{
int rc;
rc = tps65217_bl_disable(tps65217_bl);
if (rc)
return rc;
switch (pdata->isel) {
case TPS65217_BL_ISET1:
/* select ISET_1 current level */
rc = tps65217_clear_bits(tps65217_bl->tps,
TPS65217_REG_WLEDCTRL1,
TPS65217_WLEDCTRL1_ISEL,
TPS65217_PROTECT_NONE);
if (rc) {
dev_err(tps65217_bl->dev,
"failed to select ISET1 current level: %d)\n",
rc);
return rc;
}
dev_dbg(tps65217_bl->dev, "selected ISET1 current level\n");
break;
case TPS65217_BL_ISET2:
/* select ISET2 current level */
rc = tps65217_set_bits(tps65217_bl->tps, TPS65217_REG_WLEDCTRL1,
TPS65217_WLEDCTRL1_ISEL,
TPS65217_WLEDCTRL1_ISEL, TPS65217_PROTECT_NONE);
if (rc) {
dev_err(tps65217_bl->dev,
"failed to select ISET2 current level: %d\n",
rc);
return rc;
}
dev_dbg(tps65217_bl->dev, "selected ISET2 current level\n");
break;
default:
dev_err(tps65217_bl->dev,
"invalid value for current level: %d\n", pdata->isel);
return -EINVAL;
}
/* set PWM frequency */
rc = tps65217_set_bits(tps65217_bl->tps,
TPS65217_REG_WLEDCTRL1,
TPS65217_WLEDCTRL1_FDIM_MASK,
pdata->fdim,
TPS65217_PROTECT_NONE);
if (rc) {
dev_err(tps65217_bl->dev,
"failed to select PWM dimming frequency: %d\n",
rc);
return rc;
}
return 0;
}
#ifdef CONFIG_OF
static struct tps65217_bl_pdata *
tps65217_bl_parse_dt(struct platform_device *pdev)
{
struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
struct device_node *node;
struct tps65217_bl_pdata *pdata, *err;
u32 val;
node = of_get_child_by_name(tps->dev->of_node, "backlight");
if (!node)
return ERR_PTR(-ENODEV);
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
err = ERR_PTR(-ENOMEM);
goto err;
}
pdata->isel = TPS65217_BL_ISET1;
if (!of_property_read_u32(node, "isel", &val)) {
if (val < TPS65217_BL_ISET1 ||
val > TPS65217_BL_ISET2) {
dev_err(&pdev->dev,
"invalid 'isel' value in the device tree\n");
err = ERR_PTR(-EINVAL);
goto err;
}
pdata->isel = val;
}
pdata->fdim = TPS65217_BL_FDIM_200HZ;
if (!of_property_read_u32(node, "fdim", &val)) {
switch (val) {
case 100:
pdata->fdim = TPS65217_BL_FDIM_100HZ;
break;
case 200:
pdata->fdim = TPS65217_BL_FDIM_200HZ;
break;
case 500:
pdata->fdim = TPS65217_BL_FDIM_500HZ;
break;
case 1000:
pdata->fdim = TPS65217_BL_FDIM_1000HZ;
break;
default:
dev_err(&pdev->dev,
"invalid 'fdim' value in the device tree\n");
err = ERR_PTR(-EINVAL);
goto err;
}
}
if (!of_property_read_u32(node, "default-brightness", &val)) {
if (val > 100) {
dev_err(&pdev->dev,
"invalid 'default-brightness' value in the device tree\n");
err = ERR_PTR(-EINVAL);
goto err;
}
pdata->dft_brightness = val;
}
of_node_put(node);
return pdata;
err:
of_node_put(node);
return err;
}
#else
static struct tps65217_bl_pdata *
tps65217_bl_parse_dt(struct platform_device *pdev)
{
return NULL;
}
#endif
static int tps65217_bl_probe(struct platform_device *pdev)
{
int rc;
struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
struct tps65217_bl *tps65217_bl;
struct tps65217_bl_pdata *pdata;
struct backlight_properties bl_props;
pdata = tps65217_bl_parse_dt(pdev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
tps65217_bl = devm_kzalloc(&pdev->dev, sizeof(*tps65217_bl),
GFP_KERNEL);
if (tps65217_bl == NULL)
return -ENOMEM;
tps65217_bl->tps = tps;
tps65217_bl->dev = &pdev->dev;
tps65217_bl->is_enabled = false;
rc = tps65217_bl_hw_init(tps65217_bl, pdata);
if (rc)
return rc;
memset(&bl_props, 0, sizeof(struct backlight_properties));
bl_props.type = BACKLIGHT_RAW;
bl_props.max_brightness = 100;
tps65217_bl->bl = devm_backlight_device_register(&pdev->dev, pdev->name,
tps65217_bl->dev, tps65217_bl,
&tps65217_bl_ops, &bl_props);
if (IS_ERR(tps65217_bl->bl)) {
dev_err(tps65217_bl->dev,
"registration of backlight device failed: %d\n", rc);
return PTR_ERR(tps65217_bl->bl);
}
tps65217_bl->bl->props.brightness = pdata->dft_brightness;
backlight_update_status(tps65217_bl->bl);
platform_set_drvdata(pdev, tps65217_bl);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id tps65217_bl_of_match[] = {
{ .compatible = "ti,tps65217-bl", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, tps65217_bl_of_match);
#endif
static struct platform_driver tps65217_bl_driver = {
.probe = tps65217_bl_probe,
.driver = {
.name = "tps65217-bl",
.of_match_table = of_match_ptr(tps65217_bl_of_match),
},
};
module_platform_driver(tps65217_bl_driver);
MODULE_DESCRIPTION("TPS65217 Backlight driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Matthias Kaehlcke <[email protected]>");
| linux-master | drivers/video/backlight/tps65217_bl.c |
// SPDX-License-Identifier: GPL-2.0+
/*
* LCD Backlight driver for RAVE SP
*
* Copyright (C) 2018 Zodiac Inflight Innovations
*
*/
#include <linux/backlight.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mfd/rave-sp.h>
#include <linux/platform_device.h>
#define RAVE_SP_BACKLIGHT_LCD_EN BIT(7)
static int rave_sp_backlight_update_status(struct backlight_device *bd)
{
const struct backlight_properties *p = &bd->props;
const u8 intensity =
(p->power == FB_BLANK_UNBLANK) ? p->brightness : 0;
struct rave_sp *sp = dev_get_drvdata(&bd->dev);
u8 cmd[] = {
[0] = RAVE_SP_CMD_SET_BACKLIGHT,
[1] = 0,
[2] = intensity ? RAVE_SP_BACKLIGHT_LCD_EN | intensity : 0,
[3] = 0,
[4] = 0,
};
return rave_sp_exec(sp, cmd, sizeof(cmd), NULL, 0);
}
static const struct backlight_ops rave_sp_backlight_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = rave_sp_backlight_update_status,
};
static struct backlight_properties rave_sp_backlight_props = {
.type = BACKLIGHT_PLATFORM,
.max_brightness = 100,
.brightness = 50,
};
static int rave_sp_backlight_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct backlight_device *bd;
bd = devm_backlight_device_register(dev, pdev->name, dev,
dev_get_drvdata(dev->parent),
&rave_sp_backlight_ops,
&rave_sp_backlight_props);
if (IS_ERR(bd))
return PTR_ERR(bd);
/*
* If there is a phandle pointing to the device node we can
* assume that another device will manage the status changes.
* If not we make sure the backlight is in a consistent state.
*/
if (!dev->of_node->phandle)
backlight_update_status(bd);
return 0;
}
static const struct of_device_id rave_sp_backlight_of_match[] = {
{ .compatible = "zii,rave-sp-backlight" },
{}
};
static struct platform_driver rave_sp_backlight_driver = {
.probe = rave_sp_backlight_probe,
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = rave_sp_backlight_of_match,
},
};
module_platform_driver(rave_sp_backlight_driver);
MODULE_DEVICE_TABLE(of, rave_sp_backlight_of_match);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Andrey Vostrikov <[email protected]>");
MODULE_AUTHOR("Nikita Yushchenko <[email protected]>");
MODULE_AUTHOR("Andrey Smirnov <[email protected]>");
MODULE_DESCRIPTION("RAVE SP Backlight driver");
| linux-master | drivers/video/backlight/rave-sp-backlight.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Backlight driver for Wolfson Microelectronics WM831x PMICs
*
* Copyright 2009 Wolfson Microelectonics plc
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/slab.h>
#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/pdata.h>
#include <linux/mfd/wm831x/regulator.h>
struct wm831x_backlight_data {
struct wm831x *wm831x;
int isink_reg;
int current_brightness;
};
static int wm831x_backlight_set(struct backlight_device *bl, int brightness)
{
struct wm831x_backlight_data *data = bl_get_data(bl);
struct wm831x *wm831x = data->wm831x;
int power_up = !data->current_brightness && brightness;
int power_down = data->current_brightness && !brightness;
int ret;
if (power_up) {
/* Enable the ISINK */
ret = wm831x_set_bits(wm831x, data->isink_reg,
WM831X_CS1_ENA, WM831X_CS1_ENA);
if (ret < 0)
goto err;
/* Enable the DC-DC */
ret = wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE,
WM831X_DC4_ENA, WM831X_DC4_ENA);
if (ret < 0)
goto err;
}
if (power_down) {
/* DCDC first */
ret = wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE,
WM831X_DC4_ENA, 0);
if (ret < 0)
goto err;
/* ISINK */
ret = wm831x_set_bits(wm831x, data->isink_reg,
WM831X_CS1_DRIVE | WM831X_CS1_ENA, 0);
if (ret < 0)
goto err;
}
/* Set the new brightness */
ret = wm831x_set_bits(wm831x, data->isink_reg,
WM831X_CS1_ISEL_MASK, brightness);
if (ret < 0)
goto err;
if (power_up) {
/* Drive current through the ISINK */
ret = wm831x_set_bits(wm831x, data->isink_reg,
WM831X_CS1_DRIVE, WM831X_CS1_DRIVE);
if (ret < 0)
return ret;
}
data->current_brightness = brightness;
return 0;
err:
/* If we were in the middle of a power transition always shut down
* for safety.
*/
if (power_up || power_down) {
wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, WM831X_DC4_ENA, 0);
wm831x_set_bits(wm831x, data->isink_reg, WM831X_CS1_ENA, 0);
}
return ret;
}
static int wm831x_backlight_update_status(struct backlight_device *bl)
{
return wm831x_backlight_set(bl, backlight_get_brightness(bl));
}
static int wm831x_backlight_get_brightness(struct backlight_device *bl)
{
struct wm831x_backlight_data *data = bl_get_data(bl);
return data->current_brightness;
}
static const struct backlight_ops wm831x_backlight_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = wm831x_backlight_update_status,
.get_brightness = wm831x_backlight_get_brightness,
};
static int wm831x_backlight_probe(struct platform_device *pdev)
{
struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
struct wm831x_pdata *wm831x_pdata = dev_get_platdata(pdev->dev.parent);
struct wm831x_backlight_pdata *pdata;
struct wm831x_backlight_data *data;
struct backlight_device *bl;
struct backlight_properties props;
int ret, i, max_isel, isink_reg, dcdc_cfg;
/* We need platform data */
if (wm831x_pdata)
pdata = wm831x_pdata->backlight;
else
pdata = NULL;
if (!pdata) {
dev_err(&pdev->dev, "No platform data supplied\n");
return -EINVAL;
}
/* Figure out the maximum current we can use */
for (i = 0; i < WM831X_ISINK_MAX_ISEL; i++) {
if (wm831x_isinkv_values[i] > pdata->max_uA)
break;
}
if (i == 0) {
dev_err(&pdev->dev, "Invalid max_uA: %duA\n", pdata->max_uA);
return -EINVAL;
}
max_isel = i - 1;
if (pdata->max_uA != wm831x_isinkv_values[max_isel])
dev_warn(&pdev->dev,
"Maximum current is %duA not %duA as requested\n",
wm831x_isinkv_values[max_isel], pdata->max_uA);
switch (pdata->isink) {
case 1:
isink_reg = WM831X_CURRENT_SINK_1;
dcdc_cfg = 0;
break;
case 2:
isink_reg = WM831X_CURRENT_SINK_2;
dcdc_cfg = WM831X_DC4_FBSRC;
break;
default:
dev_err(&pdev->dev, "Invalid ISINK %d\n", pdata->isink);
return -EINVAL;
}
/* Configure the ISINK to use for feedback */
ret = wm831x_reg_unlock(wm831x);
if (ret < 0)
return ret;
ret = wm831x_set_bits(wm831x, WM831X_DC4_CONTROL, WM831X_DC4_FBSRC,
dcdc_cfg);
wm831x_reg_lock(wm831x);
if (ret < 0)
return ret;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
data->wm831x = wm831x;
data->current_brightness = 0;
data->isink_reg = isink_reg;
memset(&props, 0, sizeof(props));
props.type = BACKLIGHT_RAW;
props.max_brightness = max_isel;
bl = devm_backlight_device_register(&pdev->dev, "wm831x", &pdev->dev,
data, &wm831x_backlight_ops, &props);
if (IS_ERR(bl)) {
dev_err(&pdev->dev, "failed to register backlight\n");
return PTR_ERR(bl);
}
bl->props.brightness = max_isel;
platform_set_drvdata(pdev, bl);
/* Disable the DCDC if it was started so we can bootstrap */
wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, WM831X_DC4_ENA, 0);
backlight_update_status(bl);
return 0;
}
static struct platform_driver wm831x_backlight_driver = {
.driver = {
.name = "wm831x-backlight",
},
.probe = wm831x_backlight_probe,
};
module_platform_driver(wm831x_backlight_driver);
MODULE_DESCRIPTION("Backlight Driver for WM831x PMICs");
MODULE_AUTHOR("Mark Brown <[email protected]");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm831x-backlight");
| linux-master | drivers/video/backlight/wm831x_bl.c |
/*
* Backlight Driver for HP Jornada 680
*
* Copyright (c) 2005 Andriy Skulysh
*
* Based on Sharp's Corgi Backlight Driver
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <cpu/dac.h>
#include <mach/hp6xx.h>
#include <asm/hd64461.h>
#define HP680_MAX_INTENSITY 255
#define HP680_DEFAULT_INTENSITY 10
static int hp680bl_suspended;
static int current_intensity;
static DEFINE_SPINLOCK(bl_lock);
static void hp680bl_send_intensity(struct backlight_device *bd)
{
unsigned long flags;
u16 v;
int intensity = backlight_get_brightness(bd);
if (hp680bl_suspended)
intensity = 0;
spin_lock_irqsave(&bl_lock, flags);
if (intensity && current_intensity == 0) {
sh_dac_enable(DAC_LCD_BRIGHTNESS);
v = inw(HD64461_GPBDR);
v &= ~HD64461_GPBDR_LCDOFF;
outw(v, HD64461_GPBDR);
sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS);
} else if (intensity == 0 && current_intensity != 0) {
sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS);
sh_dac_disable(DAC_LCD_BRIGHTNESS);
v = inw(HD64461_GPBDR);
v |= HD64461_GPBDR_LCDOFF;
outw(v, HD64461_GPBDR);
} else if (intensity) {
sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS);
}
spin_unlock_irqrestore(&bl_lock, flags);
current_intensity = intensity;
}
#ifdef CONFIG_PM_SLEEP
static int hp680bl_suspend(struct device *dev)
{
struct backlight_device *bd = dev_get_drvdata(dev);
hp680bl_suspended = 1;
hp680bl_send_intensity(bd);
return 0;
}
static int hp680bl_resume(struct device *dev)
{
struct backlight_device *bd = dev_get_drvdata(dev);
hp680bl_suspended = 0;
hp680bl_send_intensity(bd);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(hp680bl_pm_ops, hp680bl_suspend, hp680bl_resume);
static int hp680bl_set_intensity(struct backlight_device *bd)
{
hp680bl_send_intensity(bd);
return 0;
}
static int hp680bl_get_intensity(struct backlight_device *bd)
{
return current_intensity;
}
static const struct backlight_ops hp680bl_ops = {
.get_brightness = hp680bl_get_intensity,
.update_status = hp680bl_set_intensity,
};
static int hp680bl_probe(struct platform_device *pdev)
{
struct backlight_properties props;
struct backlight_device *bd;
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = HP680_MAX_INTENSITY;
bd = devm_backlight_device_register(&pdev->dev, "hp680-bl", &pdev->dev,
NULL, &hp680bl_ops, &props);
if (IS_ERR(bd))
return PTR_ERR(bd);
platform_set_drvdata(pdev, bd);
bd->props.brightness = HP680_DEFAULT_INTENSITY;
hp680bl_send_intensity(bd);
return 0;
}
static void hp680bl_remove(struct platform_device *pdev)
{
struct backlight_device *bd = platform_get_drvdata(pdev);
bd->props.brightness = 0;
bd->props.power = 0;
hp680bl_send_intensity(bd);
}
static struct platform_driver hp680bl_driver = {
.probe = hp680bl_probe,
.remove_new = hp680bl_remove,
.driver = {
.name = "hp680-bl",
.pm = &hp680bl_pm_ops,
},
};
static struct platform_device *hp680bl_device;
static int __init hp680bl_init(void)
{
int ret;
ret = platform_driver_register(&hp680bl_driver);
if (ret)
return ret;
hp680bl_device = platform_device_register_simple("hp680-bl", -1,
NULL, 0);
if (IS_ERR(hp680bl_device)) {
platform_driver_unregister(&hp680bl_driver);
return PTR_ERR(hp680bl_device);
}
return 0;
}
static void __exit hp680bl_exit(void)
{
platform_device_unregister(hp680bl_device);
platform_driver_unregister(&hp680bl_driver);
}
module_init(hp680bl_init);
module_exit(hp680bl_exit);
MODULE_AUTHOR("Andriy Skulysh <[email protected]>");
MODULE_DESCRIPTION("HP Jornada 680 Backlight Driver");
MODULE_LICENSE("GPL");
| linux-master | drivers/video/backlight/hp680_bl.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/drivers/video/backlight/aat2870_bl.c
*
* Copyright (c) 2011, NVIDIA Corporation.
* Author: Jin Park <[email protected]>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/mfd/aat2870.h>
struct aat2870_bl_driver_data {
struct platform_device *pdev;
struct backlight_device *bd;
int channels;
int max_current;
int brightness; /* current brightness */
};
static inline int aat2870_brightness(struct aat2870_bl_driver_data *aat2870_bl,
int brightness)
{
struct backlight_device *bd = aat2870_bl->bd;
int val;
val = brightness * (aat2870_bl->max_current - 1);
val /= bd->props.max_brightness;
return val;
}
static inline int aat2870_bl_enable(struct aat2870_bl_driver_data *aat2870_bl)
{
struct aat2870_data *aat2870
= dev_get_drvdata(aat2870_bl->pdev->dev.parent);
return aat2870->write(aat2870, AAT2870_BL_CH_EN,
(u8)aat2870_bl->channels);
}
static inline int aat2870_bl_disable(struct aat2870_bl_driver_data *aat2870_bl)
{
struct aat2870_data *aat2870
= dev_get_drvdata(aat2870_bl->pdev->dev.parent);
return aat2870->write(aat2870, AAT2870_BL_CH_EN, 0x0);
}
static int aat2870_bl_update_status(struct backlight_device *bd)
{
struct aat2870_bl_driver_data *aat2870_bl = bl_get_data(bd);
struct aat2870_data *aat2870 =
dev_get_drvdata(aat2870_bl->pdev->dev.parent);
int brightness = backlight_get_brightness(bd);
int ret;
if ((brightness < 0) || (bd->props.max_brightness < brightness)) {
dev_err(&bd->dev, "invalid brightness, %d\n", brightness);
return -EINVAL;
}
dev_dbg(&bd->dev, "brightness=%d, power=%d, state=%d\n",
bd->props.brightness, bd->props.power, bd->props.state);
ret = aat2870->write(aat2870, AAT2870_BLM,
(u8)aat2870_brightness(aat2870_bl, brightness));
if (ret < 0)
return ret;
if (brightness == 0) {
ret = aat2870_bl_disable(aat2870_bl);
if (ret < 0)
return ret;
} else if (aat2870_bl->brightness == 0) {
ret = aat2870_bl_enable(aat2870_bl);
if (ret < 0)
return ret;
}
aat2870_bl->brightness = brightness;
return 0;
}
static int aat2870_bl_check_fb(struct backlight_device *bd, struct fb_info *fi)
{
return 1;
}
static const struct backlight_ops aat2870_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = aat2870_bl_update_status,
.check_fb = aat2870_bl_check_fb,
};
static int aat2870_bl_probe(struct platform_device *pdev)
{
struct aat2870_bl_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct aat2870_bl_driver_data *aat2870_bl;
struct backlight_device *bd;
struct backlight_properties props;
int ret = 0;
if (!pdata) {
dev_err(&pdev->dev, "No platform data\n");
ret = -ENXIO;
goto out;
}
if (pdev->id != AAT2870_ID_BL) {
dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
ret = -EINVAL;
goto out;
}
aat2870_bl = devm_kzalloc(&pdev->dev,
sizeof(struct aat2870_bl_driver_data),
GFP_KERNEL);
if (!aat2870_bl) {
ret = -ENOMEM;
goto out;
}
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
bd = devm_backlight_device_register(&pdev->dev, "aat2870-backlight",
&pdev->dev, aat2870_bl, &aat2870_bl_ops,
&props);
if (IS_ERR(bd)) {
dev_err(&pdev->dev,
"Failed allocate memory for backlight device\n");
ret = PTR_ERR(bd);
goto out;
}
aat2870_bl->pdev = pdev;
platform_set_drvdata(pdev, aat2870_bl);
aat2870_bl->bd = bd;
if (pdata->channels > 0)
aat2870_bl->channels = pdata->channels;
else
aat2870_bl->channels = AAT2870_BL_CH_ALL;
if (pdata->max_current > 0)
aat2870_bl->max_current = pdata->max_current;
else
aat2870_bl->max_current = AAT2870_CURRENT_27_9;
if (pdata->max_brightness > 0)
bd->props.max_brightness = pdata->max_brightness;
else
bd->props.max_brightness = 255;
aat2870_bl->brightness = 0;
bd->props.power = FB_BLANK_UNBLANK;
bd->props.brightness = bd->props.max_brightness;
ret = aat2870_bl_update_status(bd);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to initialize\n");
return ret;
}
return 0;
out:
return ret;
}
static void aat2870_bl_remove(struct platform_device *pdev)
{
struct aat2870_bl_driver_data *aat2870_bl = platform_get_drvdata(pdev);
struct backlight_device *bd = aat2870_bl->bd;
bd->props.power = FB_BLANK_POWERDOWN;
bd->props.brightness = 0;
backlight_update_status(bd);
}
static struct platform_driver aat2870_bl_driver = {
.driver = {
.name = "aat2870-backlight",
},
.probe = aat2870_bl_probe,
.remove_new = aat2870_bl_remove,
};
static int __init aat2870_bl_init(void)
{
return platform_driver_register(&aat2870_bl_driver);
}
subsys_initcall(aat2870_bl_init);
static void __exit aat2870_bl_exit(void)
{
platform_driver_unregister(&aat2870_bl_driver);
}
module_exit(aat2870_bl_exit);
MODULE_DESCRIPTION("AnalogicTech AAT2870 Backlight");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jin Park <[email protected]>");
| linux-master | drivers/video/backlight/aat2870_bl.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* (C) Copyright 2008
* Stefano Babic, DENX Software Engineering, [email protected].
*
* This driver implements a lcd device for the ILITEK 922x display
* controller. The interface to the display is SPI and the display's
* memory is cyclically updated over the RGB interface.
*/
#include <linux/fb.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/lcd.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/string.h>
/* Register offset, see manual section 8.2 */
#define REG_START_OSCILLATION 0x00
#define REG_DRIVER_CODE_READ 0x00
#define REG_DRIVER_OUTPUT_CONTROL 0x01
#define REG_LCD_AC_DRIVEING_CONTROL 0x02
#define REG_ENTRY_MODE 0x03
#define REG_COMPARE_1 0x04
#define REG_COMPARE_2 0x05
#define REG_DISPLAY_CONTROL_1 0x07
#define REG_DISPLAY_CONTROL_2 0x08
#define REG_DISPLAY_CONTROL_3 0x09
#define REG_FRAME_CYCLE_CONTROL 0x0B
#define REG_EXT_INTF_CONTROL 0x0C
#define REG_POWER_CONTROL_1 0x10
#define REG_POWER_CONTROL_2 0x11
#define REG_POWER_CONTROL_3 0x12
#define REG_POWER_CONTROL_4 0x13
#define REG_RAM_ADDRESS_SET 0x21
#define REG_WRITE_DATA_TO_GRAM 0x22
#define REG_RAM_WRITE_MASK1 0x23
#define REG_RAM_WRITE_MASK2 0x24
#define REG_GAMMA_CONTROL_1 0x30
#define REG_GAMMA_CONTROL_2 0x31
#define REG_GAMMA_CONTROL_3 0x32
#define REG_GAMMA_CONTROL_4 0x33
#define REG_GAMMA_CONTROL_5 0x34
#define REG_GAMMA_CONTROL_6 0x35
#define REG_GAMMA_CONTROL_7 0x36
#define REG_GAMMA_CONTROL_8 0x37
#define REG_GAMMA_CONTROL_9 0x38
#define REG_GAMMA_CONTROL_10 0x39
#define REG_GATE_SCAN_CONTROL 0x40
#define REG_VERT_SCROLL_CONTROL 0x41
#define REG_FIRST_SCREEN_DRIVE_POS 0x42
#define REG_SECOND_SCREEN_DRIVE_POS 0x43
#define REG_RAM_ADDR_POS_H 0x44
#define REG_RAM_ADDR_POS_V 0x45
#define REG_OSCILLATOR_CONTROL 0x4F
#define REG_GPIO 0x60
#define REG_OTP_VCM_PROGRAMMING 0x61
#define REG_OTP_VCM_STATUS_ENABLE 0x62
#define REG_OTP_PROGRAMMING_ID_KEY 0x65
/*
* maximum frequency for register access
* (not for the GRAM access)
*/
#define ILITEK_MAX_FREQ_REG 4000000
/*
* Device ID as found in the datasheet (supports 9221 and 9222)
*/
#define ILITEK_DEVICE_ID 0x9220
#define ILITEK_DEVICE_ID_MASK 0xFFF0
/* Last two bits in the START BYTE */
#define START_RS_INDEX 0
#define START_RS_REG 1
#define START_RW_WRITE 0
#define START_RW_READ 1
/**
* START_BYTE(id, rs, rw)
*
* Set the start byte according to the required operation.
* The start byte is defined as:
* ----------------------------------
* | 0 | 1 | 1 | 1 | 0 | ID | RS | RW |
* ----------------------------------
* @id: display's id as set by the manufacturer
* @rs: operation type bit, one of:
* - START_RS_INDEX set the index register
* - START_RS_REG write/read registers/GRAM
* @rw: read/write operation
* - START_RW_WRITE write
* - START_RW_READ read
*/
#define START_BYTE(id, rs, rw) \
(0x70 | (((id) & 0x01) << 2) | (((rs) & 0x01) << 1) | ((rw) & 0x01))
/**
* CHECK_FREQ_REG(spi_device s, spi_transfer x) - Check the frequency
* for the SPI transfer. According to the datasheet, the controller
* accept higher frequency for the GRAM transfer, but it requires
* lower frequency when the registers are read/written.
* The macro sets the frequency in the spi_transfer structure if
* the frequency exceeds the maximum value.
* @s: pointer to an SPI device
* @x: pointer to the read/write buffer pair
*/
#define CHECK_FREQ_REG(s, x) \
do { \
if (s->max_speed_hz > ILITEK_MAX_FREQ_REG) \
((struct spi_transfer *)x)->speed_hz = \
ILITEK_MAX_FREQ_REG; \
} while (0)
#define CMD_BUFSIZE 16
#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
#define set_tx_byte(b) (tx_invert ? ~(b) : b)
/*
* ili922x_id - id as set by manufacturer
*/
static int ili922x_id = 1;
module_param(ili922x_id, int, 0);
static int tx_invert;
module_param(tx_invert, int, 0);
/*
* driver's private structure
*/
struct ili922x {
struct spi_device *spi;
struct lcd_device *ld;
int power;
};
/**
* ili922x_read_status - read status register from display
* @spi: spi device
* @rs: output value
*/
static int ili922x_read_status(struct spi_device *spi, u16 *rs)
{
struct spi_message msg;
struct spi_transfer xfer;
unsigned char tbuf[CMD_BUFSIZE];
unsigned char rbuf[CMD_BUFSIZE];
int ret, i;
memset(&xfer, 0, sizeof(struct spi_transfer));
spi_message_init(&msg);
xfer.tx_buf = tbuf;
xfer.rx_buf = rbuf;
xfer.cs_change = 1;
CHECK_FREQ_REG(spi, &xfer);
tbuf[0] = set_tx_byte(START_BYTE(ili922x_id, START_RS_INDEX,
START_RW_READ));
/*
* we need 4-byte xfer here due to invalid dummy byte
* received after start byte
*/
for (i = 1; i < 4; i++)
tbuf[i] = set_tx_byte(0); /* dummy */
xfer.bits_per_word = 8;
xfer.len = 4;
spi_message_add_tail(&xfer, &msg);
ret = spi_sync(spi, &msg);
if (ret < 0) {
dev_dbg(&spi->dev, "Error sending SPI message 0x%x", ret);
return ret;
}
*rs = (rbuf[2] << 8) + rbuf[3];
return 0;
}
/**
* ili922x_read - read register from display
* @spi: spi device
* @reg: offset of the register to be read
* @rx: output value
*/
static int ili922x_read(struct spi_device *spi, u8 reg, u16 *rx)
{
struct spi_message msg;
struct spi_transfer xfer_regindex, xfer_regvalue;
unsigned char tbuf[CMD_BUFSIZE];
unsigned char rbuf[CMD_BUFSIZE];
int ret, len = 0, send_bytes;
memset(&xfer_regindex, 0, sizeof(struct spi_transfer));
memset(&xfer_regvalue, 0, sizeof(struct spi_transfer));
spi_message_init(&msg);
xfer_regindex.tx_buf = tbuf;
xfer_regindex.rx_buf = rbuf;
xfer_regindex.cs_change = 1;
CHECK_FREQ_REG(spi, &xfer_regindex);
tbuf[0] = set_tx_byte(START_BYTE(ili922x_id, START_RS_INDEX,
START_RW_WRITE));
tbuf[1] = set_tx_byte(0);
tbuf[2] = set_tx_byte(reg);
xfer_regindex.bits_per_word = 8;
len = xfer_regindex.len = 3;
spi_message_add_tail(&xfer_regindex, &msg);
send_bytes = len;
tbuf[len++] = set_tx_byte(START_BYTE(ili922x_id, START_RS_REG,
START_RW_READ));
tbuf[len++] = set_tx_byte(0);
tbuf[len] = set_tx_byte(0);
xfer_regvalue.cs_change = 1;
xfer_regvalue.len = 3;
xfer_regvalue.tx_buf = &tbuf[send_bytes];
xfer_regvalue.rx_buf = &rbuf[send_bytes];
CHECK_FREQ_REG(spi, &xfer_regvalue);
spi_message_add_tail(&xfer_regvalue, &msg);
ret = spi_sync(spi, &msg);
if (ret < 0) {
dev_dbg(&spi->dev, "Error sending SPI message 0x%x", ret);
return ret;
}
*rx = (rbuf[1 + send_bytes] << 8) + rbuf[2 + send_bytes];
return 0;
}
/**
* ili922x_write - write a controller register
* @spi: struct spi_device *
* @reg: offset of the register to be written
* @value: value to be written
*/
static int ili922x_write(struct spi_device *spi, u8 reg, u16 value)
{
struct spi_message msg;
struct spi_transfer xfer_regindex, xfer_regvalue;
unsigned char tbuf[CMD_BUFSIZE];
unsigned char rbuf[CMD_BUFSIZE];
int ret;
memset(&xfer_regindex, 0, sizeof(struct spi_transfer));
memset(&xfer_regvalue, 0, sizeof(struct spi_transfer));
spi_message_init(&msg);
xfer_regindex.tx_buf = tbuf;
xfer_regindex.rx_buf = rbuf;
xfer_regindex.cs_change = 1;
CHECK_FREQ_REG(spi, &xfer_regindex);
tbuf[0] = set_tx_byte(START_BYTE(ili922x_id, START_RS_INDEX,
START_RW_WRITE));
tbuf[1] = set_tx_byte(0);
tbuf[2] = set_tx_byte(reg);
xfer_regindex.bits_per_word = 8;
xfer_regindex.len = 3;
spi_message_add_tail(&xfer_regindex, &msg);
ret = spi_sync(spi, &msg);
spi_message_init(&msg);
tbuf[0] = set_tx_byte(START_BYTE(ili922x_id, START_RS_REG,
START_RW_WRITE));
tbuf[1] = set_tx_byte((value & 0xFF00) >> 8);
tbuf[2] = set_tx_byte(value & 0x00FF);
xfer_regvalue.cs_change = 1;
xfer_regvalue.len = 3;
xfer_regvalue.tx_buf = tbuf;
xfer_regvalue.rx_buf = rbuf;
CHECK_FREQ_REG(spi, &xfer_regvalue);
spi_message_add_tail(&xfer_regvalue, &msg);
ret = spi_sync(spi, &msg);
if (ret < 0) {
dev_err(&spi->dev, "Error sending SPI message 0x%x", ret);
return ret;
}
return 0;
}
#ifdef DEBUG
/**
* ili922x_reg_dump - dump all registers
*
* @spi: pointer to an SPI device
*/
static void ili922x_reg_dump(struct spi_device *spi)
{
u8 reg;
u16 rx;
dev_dbg(&spi->dev, "ILI922x configuration registers:\n");
for (reg = REG_START_OSCILLATION;
reg <= REG_OTP_PROGRAMMING_ID_KEY; reg++) {
ili922x_read(spi, reg, &rx);
dev_dbg(&spi->dev, "reg @ 0x%02X: 0x%04X\n", reg, rx);
}
}
#else
static inline void ili922x_reg_dump(struct spi_device *spi) {}
#endif
/**
* set_write_to_gram_reg - initialize the display to write the GRAM
* @spi: spi device
*/
static void set_write_to_gram_reg(struct spi_device *spi)
{
struct spi_message msg;
struct spi_transfer xfer;
unsigned char tbuf[CMD_BUFSIZE];
memset(&xfer, 0, sizeof(struct spi_transfer));
spi_message_init(&msg);
xfer.tx_buf = tbuf;
xfer.rx_buf = NULL;
xfer.cs_change = 1;
tbuf[0] = START_BYTE(ili922x_id, START_RS_INDEX, START_RW_WRITE);
tbuf[1] = 0;
tbuf[2] = REG_WRITE_DATA_TO_GRAM;
xfer.bits_per_word = 8;
xfer.len = 3;
spi_message_add_tail(&xfer, &msg);
spi_sync(spi, &msg);
}
/**
* ili922x_poweron - turn the display on
* @spi: spi device
*
* The sequence to turn on the display is taken from
* the datasheet and/or the example code provided by the
* manufacturer.
*/
static int ili922x_poweron(struct spi_device *spi)
{
int ret;
/* Power on */
ret = ili922x_write(spi, REG_POWER_CONTROL_1, 0x0000);
usleep_range(10000, 10500);
ret += ili922x_write(spi, REG_POWER_CONTROL_2, 0x0000);
ret += ili922x_write(spi, REG_POWER_CONTROL_3, 0x0000);
msleep(40);
ret += ili922x_write(spi, REG_POWER_CONTROL_4, 0x0000);
msleep(40);
/* register 0x56 is not documented in the datasheet */
ret += ili922x_write(spi, 0x56, 0x080F);
ret += ili922x_write(spi, REG_POWER_CONTROL_1, 0x4240);
usleep_range(10000, 10500);
ret += ili922x_write(spi, REG_POWER_CONTROL_2, 0x0000);
ret += ili922x_write(spi, REG_POWER_CONTROL_3, 0x0014);
msleep(40);
ret += ili922x_write(spi, REG_POWER_CONTROL_4, 0x1319);
msleep(40);
return ret;
}
/**
* ili922x_poweroff - turn the display off
* @spi: spi device
*/
static int ili922x_poweroff(struct spi_device *spi)
{
int ret;
/* Power off */
ret = ili922x_write(spi, REG_POWER_CONTROL_1, 0x0000);
usleep_range(10000, 10500);
ret += ili922x_write(spi, REG_POWER_CONTROL_2, 0x0000);
ret += ili922x_write(spi, REG_POWER_CONTROL_3, 0x0000);
msleep(40);
ret += ili922x_write(spi, REG_POWER_CONTROL_4, 0x0000);
msleep(40);
return ret;
}
/**
* ili922x_display_init - initialize the display by setting
* the configuration registers
* @spi: spi device
*/
static void ili922x_display_init(struct spi_device *spi)
{
ili922x_write(spi, REG_START_OSCILLATION, 1);
usleep_range(10000, 10500);
ili922x_write(spi, REG_DRIVER_OUTPUT_CONTROL, 0x691B);
ili922x_write(spi, REG_LCD_AC_DRIVEING_CONTROL, 0x0700);
ili922x_write(spi, REG_ENTRY_MODE, 0x1030);
ili922x_write(spi, REG_COMPARE_1, 0x0000);
ili922x_write(spi, REG_COMPARE_2, 0x0000);
ili922x_write(spi, REG_DISPLAY_CONTROL_1, 0x0037);
ili922x_write(spi, REG_DISPLAY_CONTROL_2, 0x0202);
ili922x_write(spi, REG_DISPLAY_CONTROL_3, 0x0000);
ili922x_write(spi, REG_FRAME_CYCLE_CONTROL, 0x0000);
/* Set RGB interface */
ili922x_write(spi, REG_EXT_INTF_CONTROL, 0x0110);
ili922x_poweron(spi);
ili922x_write(spi, REG_GAMMA_CONTROL_1, 0x0302);
ili922x_write(spi, REG_GAMMA_CONTROL_2, 0x0407);
ili922x_write(spi, REG_GAMMA_CONTROL_3, 0x0304);
ili922x_write(spi, REG_GAMMA_CONTROL_4, 0x0203);
ili922x_write(spi, REG_GAMMA_CONTROL_5, 0x0706);
ili922x_write(spi, REG_GAMMA_CONTROL_6, 0x0407);
ili922x_write(spi, REG_GAMMA_CONTROL_7, 0x0706);
ili922x_write(spi, REG_GAMMA_CONTROL_8, 0x0000);
ili922x_write(spi, REG_GAMMA_CONTROL_9, 0x0C06);
ili922x_write(spi, REG_GAMMA_CONTROL_10, 0x0F00);
ili922x_write(spi, REG_RAM_ADDRESS_SET, 0x0000);
ili922x_write(spi, REG_GATE_SCAN_CONTROL, 0x0000);
ili922x_write(spi, REG_VERT_SCROLL_CONTROL, 0x0000);
ili922x_write(spi, REG_FIRST_SCREEN_DRIVE_POS, 0xDB00);
ili922x_write(spi, REG_SECOND_SCREEN_DRIVE_POS, 0xDB00);
ili922x_write(spi, REG_RAM_ADDR_POS_H, 0xAF00);
ili922x_write(spi, REG_RAM_ADDR_POS_V, 0xDB00);
ili922x_reg_dump(spi);
set_write_to_gram_reg(spi);
}
static int ili922x_lcd_power(struct ili922x *lcd, int power)
{
int ret = 0;
if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
ret = ili922x_poweron(lcd->spi);
else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
ret = ili922x_poweroff(lcd->spi);
if (!ret)
lcd->power = power;
return ret;
}
static int ili922x_set_power(struct lcd_device *ld, int power)
{
struct ili922x *ili = lcd_get_data(ld);
return ili922x_lcd_power(ili, power);
}
static int ili922x_get_power(struct lcd_device *ld)
{
struct ili922x *ili = lcd_get_data(ld);
return ili->power;
}
static struct lcd_ops ili922x_ops = {
.get_power = ili922x_get_power,
.set_power = ili922x_set_power,
};
static int ili922x_probe(struct spi_device *spi)
{
struct ili922x *ili;
struct lcd_device *lcd;
int ret;
u16 reg = 0;
ili = devm_kzalloc(&spi->dev, sizeof(*ili), GFP_KERNEL);
if (!ili)
return -ENOMEM;
ili->spi = spi;
spi_set_drvdata(spi, ili);
/* check if the device is connected */
ret = ili922x_read(spi, REG_DRIVER_CODE_READ, ®);
if (ret || ((reg & ILITEK_DEVICE_ID_MASK) != ILITEK_DEVICE_ID)) {
dev_err(&spi->dev,
"no LCD found: Chip ID 0x%x, ret %d\n",
reg, ret);
return -ENODEV;
}
dev_info(&spi->dev, "ILI%x found, SPI freq %d, mode %d\n",
reg, spi->max_speed_hz, spi->mode);
ret = ili922x_read_status(spi, ®);
if (ret) {
dev_err(&spi->dev, "reading RS failed...\n");
return ret;
}
dev_dbg(&spi->dev, "status: 0x%x\n", reg);
ili922x_display_init(spi);
ili->power = FB_BLANK_POWERDOWN;
lcd = devm_lcd_device_register(&spi->dev, "ili922xlcd", &spi->dev, ili,
&ili922x_ops);
if (IS_ERR(lcd)) {
dev_err(&spi->dev, "cannot register LCD\n");
return PTR_ERR(lcd);
}
ili->ld = lcd;
spi_set_drvdata(spi, ili);
ili922x_lcd_power(ili, FB_BLANK_UNBLANK);
return 0;
}
static void ili922x_remove(struct spi_device *spi)
{
ili922x_poweroff(spi);
}
static struct spi_driver ili922x_driver = {
.driver = {
.name = "ili922x",
},
.probe = ili922x_probe,
.remove = ili922x_remove,
};
module_spi_driver(ili922x_driver);
MODULE_AUTHOR("Stefano Babic <[email protected]>");
MODULE_DESCRIPTION("ILI9221/9222 LCD driver");
MODULE_LICENSE("GPL");
MODULE_PARM_DESC(ili922x_id, "set controller identifier (default=1)");
MODULE_PARM_DESC(tx_invert, "invert bytes before sending");
| linux-master | drivers/video/backlight/ili922x.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* ROHM Semiconductor BD6107 LED Driver
*
* Copyright (C) 2013 Ideas on board SPRL
*
* Contact: Laurent Pinchart <[email protected]>
*/
#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/platform_data/bd6107.h>
#include <linux/slab.h>
#define BD6107_PSCNT1 0x00
#define BD6107_PSCNT1_PSCNTREG2 (1 << 2)
#define BD6107_PSCNT1_PSCNTREG1 (1 << 0)
#define BD6107_REGVSET 0x02
#define BD6107_REGVSET_REG1VSET_2_85V (1 << 2)
#define BD6107_REGVSET_REG1VSET_2_80V (0 << 2)
#define BD6107_LEDCNT1 0x03
#define BD6107_LEDCNT1_LEDONOFF2 (1 << 1)
#define BD6107_LEDCNT1_LEDONOFF1 (1 << 0)
#define BD6107_PORTSEL 0x04
#define BD6107_PORTSEL_LEDM(n) (1 << (n))
#define BD6107_RGB1CNT1 0x05
#define BD6107_RGB1CNT2 0x06
#define BD6107_RGB1CNT3 0x07
#define BD6107_RGB1CNT4 0x08
#define BD6107_RGB1CNT5 0x09
#define BD6107_RGB1FLM 0x0a
#define BD6107_RGB2CNT1 0x0b
#define BD6107_RGB2CNT2 0x0c
#define BD6107_RGB2CNT3 0x0d
#define BD6107_RGB2CNT4 0x0e
#define BD6107_RGB2CNT5 0x0f
#define BD6107_RGB2FLM 0x10
#define BD6107_PSCONT3 0x11
#define BD6107_SMMONCNT 0x12
#define BD6107_DCDCCNT 0x13
#define BD6107_IOSEL 0x14
#define BD6107_OUT1 0x15
#define BD6107_OUT2 0x16
#define BD6107_MASK1 0x17
#define BD6107_MASK2 0x18
#define BD6107_FACTOR1 0x19
#define BD6107_FACTOR2 0x1a
#define BD6107_CLRFACT1 0x1b
#define BD6107_CLRFACT2 0x1c
#define BD6107_STATE1 0x1d
#define BD6107_LSIVER 0x1e
#define BD6107_GRPSEL 0x1f
#define BD6107_LEDCNT2 0x20
#define BD6107_LEDCNT3 0x21
#define BD6107_MCURRENT 0x22
#define BD6107_MAINCNT1 0x23
#define BD6107_MAINCNT2 0x24
#define BD6107_SLOPECNT 0x25
#define BD6107_MSLOPE 0x26
#define BD6107_RGBSLOPE 0x27
#define BD6107_TEST 0x29
#define BD6107_SFTRST 0x2a
#define BD6107_SFTRSTGD 0x2b
struct bd6107 {
struct i2c_client *client;
struct backlight_device *backlight;
struct bd6107_platform_data *pdata;
struct gpio_desc *reset;
};
static int bd6107_write(struct bd6107 *bd, u8 reg, u8 data)
{
return i2c_smbus_write_byte_data(bd->client, reg, data);
}
static int bd6107_backlight_update_status(struct backlight_device *backlight)
{
struct bd6107 *bd = bl_get_data(backlight);
int brightness = backlight_get_brightness(backlight);
if (brightness) {
bd6107_write(bd, BD6107_PORTSEL, BD6107_PORTSEL_LEDM(2) |
BD6107_PORTSEL_LEDM(1) | BD6107_PORTSEL_LEDM(0));
bd6107_write(bd, BD6107_MAINCNT1, brightness);
bd6107_write(bd, BD6107_LEDCNT1, BD6107_LEDCNT1_LEDONOFF1);
} else {
/* Assert the reset line (gpiolib will handle active low) */
gpiod_set_value(bd->reset, 1);
msleep(24);
gpiod_set_value(bd->reset, 0);
}
return 0;
}
static int bd6107_backlight_check_fb(struct backlight_device *backlight,
struct fb_info *info)
{
struct bd6107 *bd = bl_get_data(backlight);
return !bd->pdata->dev || bd->pdata->dev == info->device;
}
static const struct backlight_ops bd6107_backlight_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = bd6107_backlight_update_status,
.check_fb = bd6107_backlight_check_fb,
};
static int bd6107_probe(struct i2c_client *client)
{
struct bd6107_platform_data *pdata = dev_get_platdata(&client->dev);
struct backlight_device *backlight;
struct backlight_properties props;
struct bd6107 *bd;
int ret;
if (pdata == NULL) {
dev_err(&client->dev, "No platform data\n");
return -EINVAL;
}
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_warn(&client->dev,
"I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n");
return -EIO;
}
bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL);
if (!bd)
return -ENOMEM;
bd->client = client;
bd->pdata = pdata;
/*
* Request the reset GPIO line with GPIOD_OUT_HIGH meaning asserted,
* so in the machine descriptor table (or other hardware description),
* the line should be flagged as active low so this will assert
* the reset.
*/
bd->reset = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(bd->reset)) {
dev_err(&client->dev, "unable to request reset GPIO\n");
ret = PTR_ERR(bd->reset);
return ret;
}
memset(&props, 0, sizeof(props));
props.type = BACKLIGHT_RAW;
props.max_brightness = 128;
props.brightness = clamp_t(unsigned int, pdata->def_value, 0,
props.max_brightness);
backlight = devm_backlight_device_register(&client->dev,
dev_name(&client->dev),
&bd->client->dev, bd,
&bd6107_backlight_ops, &props);
if (IS_ERR(backlight)) {
dev_err(&client->dev, "failed to register backlight\n");
return PTR_ERR(backlight);
}
backlight_update_status(backlight);
i2c_set_clientdata(client, backlight);
return 0;
}
static void bd6107_remove(struct i2c_client *client)
{
struct backlight_device *backlight = i2c_get_clientdata(client);
backlight->props.brightness = 0;
backlight_update_status(backlight);
}
static const struct i2c_device_id bd6107_ids[] = {
{ "bd6107", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, bd6107_ids);
static struct i2c_driver bd6107_driver = {
.driver = {
.name = "bd6107",
},
.probe = bd6107_probe,
.remove = bd6107_remove,
.id_table = bd6107_ids,
};
module_i2c_driver(bd6107_driver);
MODULE_DESCRIPTION("Rohm BD6107 Backlight Driver");
MODULE_AUTHOR("Laurent Pinchart <[email protected]>");
MODULE_LICENSE("GPL");
| linux-master | drivers/video/backlight/bd6107.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2009-2010, Lars-Peter Clausen <[email protected]>
* PCF50633 backlight device driver
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/backlight.h>
#include <linux/fb.h>
#include <linux/mfd/pcf50633/core.h>
#include <linux/mfd/pcf50633/backlight.h>
struct pcf50633_bl {
struct pcf50633 *pcf;
struct backlight_device *bl;
unsigned int brightness;
unsigned int brightness_limit;
};
/*
* pcf50633_bl_set_brightness_limit
*
* Update the brightness limit for the pc50633 backlight. The actual brightness
* will not go above the limit. This is useful to limit power drain for example
* on low battery.
*
* @dev: Pointer to a pcf50633 device
* @limit: The brightness limit. Valid values are 0-63
*/
int pcf50633_bl_set_brightness_limit(struct pcf50633 *pcf, unsigned int limit)
{
struct pcf50633_bl *pcf_bl = platform_get_drvdata(pcf->bl_pdev);
if (!pcf_bl)
return -ENODEV;
pcf_bl->brightness_limit = limit & 0x3f;
backlight_update_status(pcf_bl->bl);
return 0;
}
static int pcf50633_bl_update_status(struct backlight_device *bl)
{
struct pcf50633_bl *pcf_bl = bl_get_data(bl);
unsigned int new_brightness;
if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK) ||
bl->props.power != FB_BLANK_UNBLANK)
new_brightness = 0;
else if (bl->props.brightness < pcf_bl->brightness_limit)
new_brightness = bl->props.brightness;
else
new_brightness = pcf_bl->brightness_limit;
if (pcf_bl->brightness == new_brightness)
return 0;
if (new_brightness) {
pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDOUT,
new_brightness);
if (!pcf_bl->brightness)
pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDENA, 1);
} else {
pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDENA, 0);
}
pcf_bl->brightness = new_brightness;
return 0;
}
static int pcf50633_bl_get_brightness(struct backlight_device *bl)
{
struct pcf50633_bl *pcf_bl = bl_get_data(bl);
return pcf_bl->brightness;
}
static const struct backlight_ops pcf50633_bl_ops = {
.get_brightness = pcf50633_bl_get_brightness,
.update_status = pcf50633_bl_update_status,
.options = BL_CORE_SUSPENDRESUME,
};
static int pcf50633_bl_probe(struct platform_device *pdev)
{
struct pcf50633_bl *pcf_bl;
struct device *parent = pdev->dev.parent;
struct pcf50633_platform_data *pcf50633_data = dev_get_platdata(parent);
struct pcf50633_bl_platform_data *pdata = pcf50633_data->backlight_data;
struct backlight_properties bl_props;
pcf_bl = devm_kzalloc(&pdev->dev, sizeof(*pcf_bl), GFP_KERNEL);
if (!pcf_bl)
return -ENOMEM;
memset(&bl_props, 0, sizeof(bl_props));
bl_props.type = BACKLIGHT_RAW;
bl_props.max_brightness = 0x3f;
bl_props.power = FB_BLANK_UNBLANK;
if (pdata) {
bl_props.brightness = pdata->default_brightness;
pcf_bl->brightness_limit = pdata->default_brightness_limit;
} else {
bl_props.brightness = 0x3f;
pcf_bl->brightness_limit = 0x3f;
}
pcf_bl->pcf = dev_to_pcf50633(pdev->dev.parent);
pcf_bl->bl = devm_backlight_device_register(&pdev->dev, pdev->name,
&pdev->dev, pcf_bl,
&pcf50633_bl_ops, &bl_props);
if (IS_ERR(pcf_bl->bl))
return PTR_ERR(pcf_bl->bl);
platform_set_drvdata(pdev, pcf_bl);
pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDDIM, pdata->ramp_time);
/*
* Should be different from bl_props.brightness, so we do not exit
* update_status early the first time it's called
*/
pcf_bl->brightness = pcf_bl->bl->props.brightness + 1;
backlight_update_status(pcf_bl->bl);
return 0;
}
static struct platform_driver pcf50633_bl_driver = {
.probe = pcf50633_bl_probe,
.driver = {
.name = "pcf50633-backlight",
},
};
module_platform_driver(pcf50633_bl_driver);
MODULE_AUTHOR("Lars-Peter Clausen <[email protected]>");
MODULE_DESCRIPTION("PCF50633 backlight driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pcf50633-backlight");
| linux-master | drivers/video/backlight/pcf50633-backlight.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Simple driver for Texas Instruments LM3630A Backlight driver chip
* Copyright (C) 2012 Texas Instruments
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/backlight.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/uaccess.h>
#include <linux/interrupt.h>
#include <linux/regmap.h>
#include <linux/gpio/consumer.h>
#include <linux/pwm.h>
#include <linux/platform_data/lm3630a_bl.h>
#define REG_CTRL 0x00
#define REG_BOOST 0x02
#define REG_CONFIG 0x01
#define REG_BRT_A 0x03
#define REG_BRT_B 0x04
#define REG_I_A 0x05
#define REG_I_B 0x06
#define REG_INT_STATUS 0x09
#define REG_INT_EN 0x0A
#define REG_FAULT 0x0B
#define REG_PWM_OUTLOW 0x12
#define REG_PWM_OUTHIGH 0x13
#define REG_FILTER_STRENGTH 0x50
#define REG_MAX 0x50
#define INT_DEBOUNCE_MSEC 10
#define LM3630A_BANK_0 0
#define LM3630A_BANK_1 1
#define LM3630A_NUM_SINKS 2
#define LM3630A_SINK_0 0
#define LM3630A_SINK_1 1
struct lm3630a_chip {
struct device *dev;
struct delayed_work work;
int irq;
struct workqueue_struct *irqthread;
struct lm3630a_platform_data *pdata;
struct backlight_device *bleda;
struct backlight_device *bledb;
struct gpio_desc *enable_gpio;
struct regmap *regmap;
struct pwm_device *pwmd;
struct pwm_state pwmd_state;
};
/* i2c access */
static int lm3630a_read(struct lm3630a_chip *pchip, unsigned int reg)
{
int rval;
unsigned int reg_val;
rval = regmap_read(pchip->regmap, reg, ®_val);
if (rval < 0)
return rval;
return reg_val & 0xFF;
}
static int lm3630a_write(struct lm3630a_chip *pchip,
unsigned int reg, unsigned int data)
{
return regmap_write(pchip->regmap, reg, data);
}
static int lm3630a_update(struct lm3630a_chip *pchip,
unsigned int reg, unsigned int mask,
unsigned int data)
{
return regmap_update_bits(pchip->regmap, reg, mask, data);
}
/* initialize chip */
static int lm3630a_chip_init(struct lm3630a_chip *pchip)
{
int rval;
struct lm3630a_platform_data *pdata = pchip->pdata;
usleep_range(1000, 2000);
/* set Filter Strength Register */
rval = lm3630a_write(pchip, REG_FILTER_STRENGTH, 0x03);
/* set Cofig. register */
rval |= lm3630a_update(pchip, REG_CONFIG, 0x07, pdata->pwm_ctrl);
/* set boost control */
rval |= lm3630a_write(pchip, REG_BOOST, 0x38);
/* set current A */
rval |= lm3630a_update(pchip, REG_I_A, 0x1F, 0x1F);
/* set current B */
rval |= lm3630a_write(pchip, REG_I_B, 0x1F);
/* set control */
rval |= lm3630a_update(pchip, REG_CTRL, 0x14, pdata->leda_ctrl);
rval |= lm3630a_update(pchip, REG_CTRL, 0x0B, pdata->ledb_ctrl);
usleep_range(1000, 2000);
/* set brightness A and B */
rval |= lm3630a_write(pchip, REG_BRT_A, pdata->leda_init_brt);
rval |= lm3630a_write(pchip, REG_BRT_B, pdata->ledb_init_brt);
if (rval < 0)
dev_err(pchip->dev, "i2c failed to access register\n");
return rval;
}
/* interrupt handling */
static void lm3630a_delayed_func(struct work_struct *work)
{
int rval;
struct lm3630a_chip *pchip;
pchip = container_of(work, struct lm3630a_chip, work.work);
rval = lm3630a_read(pchip, REG_INT_STATUS);
if (rval < 0) {
dev_err(pchip->dev,
"i2c failed to access REG_INT_STATUS Register\n");
return;
}
dev_info(pchip->dev, "REG_INT_STATUS Register is 0x%x\n", rval);
}
static irqreturn_t lm3630a_isr_func(int irq, void *chip)
{
int rval;
struct lm3630a_chip *pchip = chip;
unsigned long delay = msecs_to_jiffies(INT_DEBOUNCE_MSEC);
queue_delayed_work(pchip->irqthread, &pchip->work, delay);
rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
if (rval < 0) {
dev_err(pchip->dev, "i2c failed to access register\n");
return IRQ_NONE;
}
return IRQ_HANDLED;
}
static int lm3630a_intr_config(struct lm3630a_chip *pchip)
{
int rval;
rval = lm3630a_write(pchip, REG_INT_EN, 0x87);
if (rval < 0)
return rval;
INIT_DELAYED_WORK(&pchip->work, lm3630a_delayed_func);
pchip->irqthread = create_singlethread_workqueue("lm3630a-irqthd");
if (!pchip->irqthread) {
dev_err(pchip->dev, "create irq thread fail\n");
return -ENOMEM;
}
if (request_threaded_irq
(pchip->irq, NULL, lm3630a_isr_func,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "lm3630a_irq", pchip)) {
dev_err(pchip->dev, "request threaded irq fail\n");
destroy_workqueue(pchip->irqthread);
return -ENOMEM;
}
return rval;
}
static int lm3630a_pwm_ctrl(struct lm3630a_chip *pchip, int br, int br_max)
{
int err;
pchip->pwmd_state.period = pchip->pdata->pwm_period;
err = pwm_set_relative_duty_cycle(&pchip->pwmd_state, br, br_max);
if (err)
return err;
pchip->pwmd_state.enabled = pchip->pwmd_state.duty_cycle ? true : false;
return pwm_apply_state(pchip->pwmd, &pchip->pwmd_state);
}
/* update and get brightness */
static int lm3630a_bank_a_update_status(struct backlight_device *bl)
{
int ret;
struct lm3630a_chip *pchip = bl_get_data(bl);
enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
/* pwm control */
if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0)
return lm3630a_pwm_ctrl(pchip, bl->props.brightness,
bl->props.max_brightness);
/* disable sleep */
ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
if (ret < 0)
goto out_i2c_err;
usleep_range(1000, 2000);
/* minimum brightness is 0x04 */
ret = lm3630a_write(pchip, REG_BRT_A, bl->props.brightness);
if (backlight_is_blank(bl) || (backlight_get_brightness(bl) < 0x4))
/* turn the string off */
ret |= lm3630a_update(pchip, REG_CTRL, LM3630A_LEDA_ENABLE, 0);
else
ret |= lm3630a_update(pchip, REG_CTRL,
LM3630A_LEDA_ENABLE, LM3630A_LEDA_ENABLE);
if (ret < 0)
goto out_i2c_err;
return 0;
out_i2c_err:
dev_err(pchip->dev, "i2c failed to access (%pe)\n", ERR_PTR(ret));
return ret;
}
static int lm3630a_bank_a_get_brightness(struct backlight_device *bl)
{
int brightness, rval;
struct lm3630a_chip *pchip = bl_get_data(bl);
enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0) {
rval = lm3630a_read(pchip, REG_PWM_OUTHIGH);
if (rval < 0)
goto out_i2c_err;
brightness = (rval & 0x01) << 8;
rval = lm3630a_read(pchip, REG_PWM_OUTLOW);
if (rval < 0)
goto out_i2c_err;
brightness |= rval;
goto out;
}
/* disable sleep */
rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
if (rval < 0)
goto out_i2c_err;
usleep_range(1000, 2000);
rval = lm3630a_read(pchip, REG_BRT_A);
if (rval < 0)
goto out_i2c_err;
brightness = rval;
out:
bl->props.brightness = brightness;
return bl->props.brightness;
out_i2c_err:
dev_err(pchip->dev, "i2c failed to access register\n");
return 0;
}
static const struct backlight_ops lm3630a_bank_a_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = lm3630a_bank_a_update_status,
.get_brightness = lm3630a_bank_a_get_brightness,
};
/* update and get brightness */
static int lm3630a_bank_b_update_status(struct backlight_device *bl)
{
int ret;
struct lm3630a_chip *pchip = bl_get_data(bl);
enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
/* pwm control */
if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0)
return lm3630a_pwm_ctrl(pchip, bl->props.brightness,
bl->props.max_brightness);
/* disable sleep */
ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
if (ret < 0)
goto out_i2c_err;
usleep_range(1000, 2000);
/* minimum brightness is 0x04 */
ret = lm3630a_write(pchip, REG_BRT_B, bl->props.brightness);
if (backlight_is_blank(bl) || (backlight_get_brightness(bl) < 0x4))
/* turn the string off */
ret |= lm3630a_update(pchip, REG_CTRL, LM3630A_LEDB_ENABLE, 0);
else
ret |= lm3630a_update(pchip, REG_CTRL,
LM3630A_LEDB_ENABLE, LM3630A_LEDB_ENABLE);
if (ret < 0)
goto out_i2c_err;
return 0;
out_i2c_err:
dev_err(pchip->dev, "i2c failed to access (%pe)\n", ERR_PTR(ret));
return ret;
}
static int lm3630a_bank_b_get_brightness(struct backlight_device *bl)
{
int brightness, rval;
struct lm3630a_chip *pchip = bl_get_data(bl);
enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0) {
rval = lm3630a_read(pchip, REG_PWM_OUTHIGH);
if (rval < 0)
goto out_i2c_err;
brightness = (rval & 0x01) << 8;
rval = lm3630a_read(pchip, REG_PWM_OUTLOW);
if (rval < 0)
goto out_i2c_err;
brightness |= rval;
goto out;
}
/* disable sleep */
rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
if (rval < 0)
goto out_i2c_err;
usleep_range(1000, 2000);
rval = lm3630a_read(pchip, REG_BRT_B);
if (rval < 0)
goto out_i2c_err;
brightness = rval;
out:
bl->props.brightness = brightness;
return bl->props.brightness;
out_i2c_err:
dev_err(pchip->dev, "i2c failed to access register\n");
return 0;
}
static const struct backlight_ops lm3630a_bank_b_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = lm3630a_bank_b_update_status,
.get_brightness = lm3630a_bank_b_get_brightness,
};
static int lm3630a_backlight_register(struct lm3630a_chip *pchip)
{
struct lm3630a_platform_data *pdata = pchip->pdata;
struct backlight_properties props;
const char *label;
props.type = BACKLIGHT_RAW;
if (pdata->leda_ctrl != LM3630A_LEDA_DISABLE) {
props.brightness = pdata->leda_init_brt;
props.max_brightness = pdata->leda_max_brt;
label = pdata->leda_label ? pdata->leda_label : "lm3630a_leda";
pchip->bleda =
devm_backlight_device_register(pchip->dev, label,
pchip->dev, pchip,
&lm3630a_bank_a_ops, &props);
if (IS_ERR(pchip->bleda))
return PTR_ERR(pchip->bleda);
}
if ((pdata->ledb_ctrl != LM3630A_LEDB_DISABLE) &&
(pdata->ledb_ctrl != LM3630A_LEDB_ON_A)) {
props.brightness = pdata->ledb_init_brt;
props.max_brightness = pdata->ledb_max_brt;
label = pdata->ledb_label ? pdata->ledb_label : "lm3630a_ledb";
pchip->bledb =
devm_backlight_device_register(pchip->dev, label,
pchip->dev, pchip,
&lm3630a_bank_b_ops, &props);
if (IS_ERR(pchip->bledb))
return PTR_ERR(pchip->bledb);
}
return 0;
}
static const struct regmap_config lm3630a_regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = REG_MAX,
};
static int lm3630a_parse_led_sources(struct fwnode_handle *node,
int default_led_sources)
{
u32 sources[LM3630A_NUM_SINKS];
int ret, num_sources, i;
num_sources = fwnode_property_count_u32(node, "led-sources");
if (num_sources < 0)
return default_led_sources;
else if (num_sources > ARRAY_SIZE(sources))
return -EINVAL;
ret = fwnode_property_read_u32_array(node, "led-sources", sources,
num_sources);
if (ret)
return ret;
for (i = 0; i < num_sources; i++) {
if (sources[i] != LM3630A_SINK_0 && sources[i] != LM3630A_SINK_1)
return -EINVAL;
ret |= BIT(sources[i]);
}
return ret;
}
static int lm3630a_parse_bank(struct lm3630a_platform_data *pdata,
struct fwnode_handle *node, int *seen_led_sources)
{
int led_sources, ret;
const char *label;
u32 bank, val;
bool linear;
ret = fwnode_property_read_u32(node, "reg", &bank);
if (ret)
return ret;
if (bank != LM3630A_BANK_0 && bank != LM3630A_BANK_1)
return -EINVAL;
led_sources = lm3630a_parse_led_sources(node, BIT(bank));
if (led_sources < 0)
return led_sources;
if (*seen_led_sources & led_sources)
return -EINVAL;
*seen_led_sources |= led_sources;
linear = fwnode_property_read_bool(node,
"ti,linear-mapping-mode");
if (bank) {
if (led_sources & BIT(LM3630A_SINK_0) ||
!(led_sources & BIT(LM3630A_SINK_1)))
return -EINVAL;
pdata->ledb_ctrl = linear ?
LM3630A_LEDB_ENABLE_LINEAR :
LM3630A_LEDB_ENABLE;
} else {
if (!(led_sources & BIT(LM3630A_SINK_0)))
return -EINVAL;
pdata->leda_ctrl = linear ?
LM3630A_LEDA_ENABLE_LINEAR :
LM3630A_LEDA_ENABLE;
if (led_sources & BIT(LM3630A_SINK_1))
pdata->ledb_ctrl = LM3630A_LEDB_ON_A;
}
ret = fwnode_property_read_string(node, "label", &label);
if (!ret) {
if (bank)
pdata->ledb_label = label;
else
pdata->leda_label = label;
}
ret = fwnode_property_read_u32(node, "default-brightness",
&val);
if (!ret) {
if (bank)
pdata->ledb_init_brt = val;
else
pdata->leda_init_brt = val;
}
ret = fwnode_property_read_u32(node, "max-brightness", &val);
if (!ret) {
if (bank)
pdata->ledb_max_brt = val;
else
pdata->leda_max_brt = val;
}
return 0;
}
static int lm3630a_parse_node(struct lm3630a_chip *pchip,
struct lm3630a_platform_data *pdata)
{
int ret = -ENODEV, seen_led_sources = 0;
struct fwnode_handle *node;
device_for_each_child_node(pchip->dev, node) {
ret = lm3630a_parse_bank(pdata, node, &seen_led_sources);
if (ret) {
fwnode_handle_put(node);
return ret;
}
}
return ret;
}
static int lm3630a_probe(struct i2c_client *client)
{
struct lm3630a_platform_data *pdata = dev_get_platdata(&client->dev);
struct lm3630a_chip *pchip;
int rval;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(&client->dev, "fail : i2c functionality check\n");
return -EOPNOTSUPP;
}
pchip = devm_kzalloc(&client->dev, sizeof(struct lm3630a_chip),
GFP_KERNEL);
if (!pchip)
return -ENOMEM;
pchip->dev = &client->dev;
pchip->regmap = devm_regmap_init_i2c(client, &lm3630a_regmap);
if (IS_ERR(pchip->regmap)) {
rval = PTR_ERR(pchip->regmap);
dev_err(&client->dev, "fail : allocate reg. map: %d\n", rval);
return rval;
}
i2c_set_clientdata(client, pchip);
if (pdata == NULL) {
pdata = devm_kzalloc(pchip->dev,
sizeof(struct lm3630a_platform_data),
GFP_KERNEL);
if (pdata == NULL)
return -ENOMEM;
/* default values */
pdata->leda_max_brt = LM3630A_MAX_BRIGHTNESS;
pdata->ledb_max_brt = LM3630A_MAX_BRIGHTNESS;
pdata->leda_init_brt = LM3630A_MAX_BRIGHTNESS;
pdata->ledb_init_brt = LM3630A_MAX_BRIGHTNESS;
rval = lm3630a_parse_node(pchip, pdata);
if (rval) {
dev_err(&client->dev, "fail : parse node\n");
return rval;
}
}
pchip->pdata = pdata;
pchip->enable_gpio = devm_gpiod_get_optional(&client->dev, "enable",
GPIOD_OUT_HIGH);
if (IS_ERR(pchip->enable_gpio)) {
rval = PTR_ERR(pchip->enable_gpio);
return rval;
}
/* chip initialize */
rval = lm3630a_chip_init(pchip);
if (rval < 0) {
dev_err(&client->dev, "fail : init chip\n");
return rval;
}
/* backlight register */
rval = lm3630a_backlight_register(pchip);
if (rval < 0) {
dev_err(&client->dev, "fail : backlight register.\n");
return rval;
}
/* pwm */
if (pdata->pwm_ctrl != LM3630A_PWM_DISABLE) {
pchip->pwmd = devm_pwm_get(pchip->dev, "lm3630a-pwm");
if (IS_ERR(pchip->pwmd)) {
dev_err(&client->dev, "fail : get pwm device\n");
return PTR_ERR(pchip->pwmd);
}
pwm_init_state(pchip->pwmd, &pchip->pwmd_state);
}
/* interrupt enable : irq 0 is not allowed */
pchip->irq = client->irq;
if (pchip->irq) {
rval = lm3630a_intr_config(pchip);
if (rval < 0)
return rval;
}
dev_info(&client->dev, "LM3630A backlight register OK.\n");
return 0;
}
static void lm3630a_remove(struct i2c_client *client)
{
int rval;
struct lm3630a_chip *pchip = i2c_get_clientdata(client);
rval = lm3630a_write(pchip, REG_BRT_A, 0);
if (rval < 0)
dev_err(pchip->dev, "i2c failed to access register\n");
rval = lm3630a_write(pchip, REG_BRT_B, 0);
if (rval < 0)
dev_err(pchip->dev, "i2c failed to access register\n");
if (pchip->irq) {
free_irq(pchip->irq, pchip);
destroy_workqueue(pchip->irqthread);
}
}
static const struct i2c_device_id lm3630a_id[] = {
{LM3630A_NAME, 0},
{}
};
MODULE_DEVICE_TABLE(i2c, lm3630a_id);
static const struct of_device_id lm3630a_match_table[] = {
{ .compatible = "ti,lm3630a", },
{ },
};
MODULE_DEVICE_TABLE(of, lm3630a_match_table);
static struct i2c_driver lm3630a_i2c_driver = {
.driver = {
.name = LM3630A_NAME,
.of_match_table = lm3630a_match_table,
},
.probe = lm3630a_probe,
.remove = lm3630a_remove,
.id_table = lm3630a_id,
};
module_i2c_driver(lm3630a_i2c_driver);
MODULE_DESCRIPTION("Texas Instruments Backlight driver for LM3630A");
MODULE_AUTHOR("Daniel Jeong <[email protected]>");
MODULE_AUTHOR("LDD MLP <[email protected]>");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/video/backlight/lm3630a_bl.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* TI LP855x Backlight Driver
*
* Copyright (C) 2011 Texas Instruments
*/
#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/platform_data/lp855x.h>
#include <linux/pwm.h>
#include <linux/regulator/consumer.h>
/* LP8550/1/2/3/6 Registers */
#define LP855X_BRIGHTNESS_CTRL 0x00
#define LP855X_DEVICE_CTRL 0x01
#define LP855X_EEPROM_START 0xA0
#define LP855X_EEPROM_END 0xA7
#define LP8556_EPROM_START 0xA0
#define LP8556_EPROM_END 0xAF
/* LP8555/7 Registers */
#define LP8557_BL_CMD 0x00
#define LP8557_BL_MASK 0x01
#define LP8557_BL_ON 0x01
#define LP8557_BL_OFF 0x00
#define LP8557_BRIGHTNESS_CTRL 0x04
#define LP8557_CONFIG 0x10
#define LP8555_EPROM_START 0x10
#define LP8555_EPROM_END 0x7A
#define LP8557_EPROM_START 0x10
#define LP8557_EPROM_END 0x1E
#define DEFAULT_BL_NAME "lcd-backlight"
#define MAX_BRIGHTNESS 255
enum lp855x_brightness_ctrl_mode {
PWM_BASED = 1,
REGISTER_BASED,
};
struct lp855x;
/*
* struct lp855x_device_config
* @pre_init_device: init device function call before updating the brightness
* @reg_brightness: register address for brigthenss control
* @reg_devicectrl: register address for device control
* @post_init_device: late init device function call
*/
struct lp855x_device_config {
int (*pre_init_device)(struct lp855x *);
u8 reg_brightness;
u8 reg_devicectrl;
int (*post_init_device)(struct lp855x *);
};
struct lp855x {
const char *chipname;
enum lp855x_chip_id chip_id;
enum lp855x_brightness_ctrl_mode mode;
struct lp855x_device_config *cfg;
struct i2c_client *client;
struct backlight_device *bl;
struct device *dev;
struct lp855x_platform_data *pdata;
struct pwm_device *pwm;
bool needs_pwm_init;
struct regulator *supply; /* regulator for VDD input */
struct regulator *enable; /* regulator for EN/VDDIO input */
};
static int lp855x_write_byte(struct lp855x *lp, u8 reg, u8 data)
{
return i2c_smbus_write_byte_data(lp->client, reg, data);
}
static int lp855x_update_bit(struct lp855x *lp, u8 reg, u8 mask, u8 data)
{
int ret;
u8 tmp;
ret = i2c_smbus_read_byte_data(lp->client, reg);
if (ret < 0) {
dev_err(lp->dev, "failed to read 0x%.2x\n", reg);
return ret;
}
tmp = (u8)ret;
tmp &= ~mask;
tmp |= data & mask;
return lp855x_write_byte(lp, reg, tmp);
}
static bool lp855x_is_valid_rom_area(struct lp855x *lp, u8 addr)
{
u8 start, end;
switch (lp->chip_id) {
case LP8550:
case LP8551:
case LP8552:
case LP8553:
start = LP855X_EEPROM_START;
end = LP855X_EEPROM_END;
break;
case LP8556:
start = LP8556_EPROM_START;
end = LP8556_EPROM_END;
break;
case LP8555:
start = LP8555_EPROM_START;
end = LP8555_EPROM_END;
break;
case LP8557:
start = LP8557_EPROM_START;
end = LP8557_EPROM_END;
break;
default:
return false;
}
return addr >= start && addr <= end;
}
static int lp8557_bl_off(struct lp855x *lp)
{
/* BL_ON = 0 before updating EPROM settings */
return lp855x_update_bit(lp, LP8557_BL_CMD, LP8557_BL_MASK,
LP8557_BL_OFF);
}
static int lp8557_bl_on(struct lp855x *lp)
{
/* BL_ON = 1 after updating EPROM settings */
return lp855x_update_bit(lp, LP8557_BL_CMD, LP8557_BL_MASK,
LP8557_BL_ON);
}
static struct lp855x_device_config lp855x_dev_cfg = {
.reg_brightness = LP855X_BRIGHTNESS_CTRL,
.reg_devicectrl = LP855X_DEVICE_CTRL,
};
static struct lp855x_device_config lp8557_dev_cfg = {
.reg_brightness = LP8557_BRIGHTNESS_CTRL,
.reg_devicectrl = LP8557_CONFIG,
.pre_init_device = lp8557_bl_off,
.post_init_device = lp8557_bl_on,
};
/*
* Device specific configuration flow
*
* a) pre_init_device(optional)
* b) update the brightness register
* c) update device control register
* d) update ROM area(optional)
* e) post_init_device(optional)
*
*/
static int lp855x_configure(struct lp855x *lp)
{
u8 val, addr;
int i, ret;
struct lp855x_platform_data *pd = lp->pdata;
if (lp->cfg->pre_init_device) {
ret = lp->cfg->pre_init_device(lp);
if (ret) {
dev_err(lp->dev, "pre init device err: %d\n", ret);
goto err;
}
}
val = pd->initial_brightness;
ret = lp855x_write_byte(lp, lp->cfg->reg_brightness, val);
if (ret)
goto err;
val = pd->device_control;
ret = lp855x_write_byte(lp, lp->cfg->reg_devicectrl, val);
if (ret)
goto err;
if (pd->size_program > 0) {
for (i = 0; i < pd->size_program; i++) {
addr = pd->rom_data[i].addr;
val = pd->rom_data[i].val;
if (!lp855x_is_valid_rom_area(lp, addr))
continue;
ret = lp855x_write_byte(lp, addr, val);
if (ret)
goto err;
}
}
if (lp->cfg->post_init_device) {
ret = lp->cfg->post_init_device(lp);
if (ret) {
dev_err(lp->dev, "post init device err: %d\n", ret);
goto err;
}
}
return 0;
err:
return ret;
}
static int lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
{
struct pwm_state state;
if (lp->needs_pwm_init) {
pwm_init_state(lp->pwm, &state);
/* Legacy platform data compatibility */
if (lp->pdata->period_ns > 0)
state.period = lp->pdata->period_ns;
lp->needs_pwm_init = false;
} else {
pwm_get_state(lp->pwm, &state);
}
state.duty_cycle = div_u64(br * state.period, max_br);
state.enabled = state.duty_cycle;
return pwm_apply_state(lp->pwm, &state);
}
static int lp855x_bl_update_status(struct backlight_device *bl)
{
struct lp855x *lp = bl_get_data(bl);
int brightness = bl->props.brightness;
if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
brightness = 0;
if (lp->mode == PWM_BASED)
return lp855x_pwm_ctrl(lp, brightness,
bl->props.max_brightness);
else if (lp->mode == REGISTER_BASED)
return lp855x_write_byte(lp, lp->cfg->reg_brightness,
(u8)brightness);
return -EINVAL;
}
static const struct backlight_ops lp855x_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = lp855x_bl_update_status,
};
static int lp855x_backlight_register(struct lp855x *lp)
{
struct backlight_device *bl;
struct backlight_properties props;
struct lp855x_platform_data *pdata = lp->pdata;
const char *name = pdata->name ? : DEFAULT_BL_NAME;
memset(&props, 0, sizeof(props));
props.type = BACKLIGHT_PLATFORM;
props.max_brightness = MAX_BRIGHTNESS;
if (pdata->initial_brightness > props.max_brightness)
pdata->initial_brightness = props.max_brightness;
props.brightness = pdata->initial_brightness;
bl = devm_backlight_device_register(lp->dev, name, lp->dev, lp,
&lp855x_bl_ops, &props);
if (IS_ERR(bl))
return PTR_ERR(bl);
lp->bl = bl;
return 0;
}
static ssize_t lp855x_get_chip_id(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lp855x *lp = dev_get_drvdata(dev);
return scnprintf(buf, PAGE_SIZE, "%s\n", lp->chipname);
}
static ssize_t lp855x_get_bl_ctl_mode(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lp855x *lp = dev_get_drvdata(dev);
char *strmode = NULL;
if (lp->mode == PWM_BASED)
strmode = "pwm based";
else if (lp->mode == REGISTER_BASED)
strmode = "register based";
return scnprintf(buf, PAGE_SIZE, "%s\n", strmode);
}
static DEVICE_ATTR(chip_id, S_IRUGO, lp855x_get_chip_id, NULL);
static DEVICE_ATTR(bl_ctl_mode, S_IRUGO, lp855x_get_bl_ctl_mode, NULL);
static struct attribute *lp855x_attributes[] = {
&dev_attr_chip_id.attr,
&dev_attr_bl_ctl_mode.attr,
NULL,
};
static const struct attribute_group lp855x_attr_group = {
.attrs = lp855x_attributes,
};
#ifdef CONFIG_OF
static int lp855x_parse_dt(struct lp855x *lp)
{
struct device *dev = lp->dev;
struct device_node *node = dev->of_node;
struct lp855x_platform_data *pdata = lp->pdata;
int rom_length;
if (!node) {
dev_err(dev, "no platform data\n");
return -EINVAL;
}
of_property_read_string(node, "bl-name", &pdata->name);
of_property_read_u8(node, "dev-ctrl", &pdata->device_control);
of_property_read_u8(node, "init-brt", &pdata->initial_brightness);
/* Deprecated, specify period in pwms property instead */
of_property_read_u32(node, "pwm-period", &pdata->period_ns);
/* Fill ROM platform data if defined */
rom_length = of_get_child_count(node);
if (rom_length > 0) {
struct lp855x_rom_data *rom;
struct device_node *child;
int i = 0;
rom = devm_kcalloc(dev, rom_length, sizeof(*rom), GFP_KERNEL);
if (!rom)
return -ENOMEM;
for_each_child_of_node(node, child) {
of_property_read_u8(child, "rom-addr", &rom[i].addr);
of_property_read_u8(child, "rom-val", &rom[i].val);
i++;
}
pdata->size_program = rom_length;
pdata->rom_data = &rom[0];
}
return 0;
}
#else
static int lp855x_parse_dt(struct lp855x *lp)
{
return -EINVAL;
}
#endif
static int lp855x_parse_acpi(struct lp855x *lp)
{
int ret;
/*
* On ACPI the device has already been initialized by the firmware
* and is in register mode, so we can read back the settings from
* the registers.
*/
ret = i2c_smbus_read_byte_data(lp->client, lp->cfg->reg_brightness);
if (ret < 0)
return ret;
lp->pdata->initial_brightness = ret;
ret = i2c_smbus_read_byte_data(lp->client, lp->cfg->reg_devicectrl);
if (ret < 0)
return ret;
lp->pdata->device_control = ret;
return 0;
}
static int lp855x_probe(struct i2c_client *cl)
{
const struct i2c_device_id *id = i2c_client_get_device_id(cl);
const struct acpi_device_id *acpi_id = NULL;
struct device *dev = &cl->dev;
struct lp855x *lp;
int ret;
if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
return -EIO;
lp = devm_kzalloc(dev, sizeof(struct lp855x), GFP_KERNEL);
if (!lp)
return -ENOMEM;
lp->client = cl;
lp->dev = dev;
lp->pdata = dev_get_platdata(dev);
if (id) {
lp->chipname = id->name;
lp->chip_id = id->driver_data;
} else {
acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
if (!acpi_id)
return -ENODEV;
lp->chipname = acpi_id->id;
lp->chip_id = acpi_id->driver_data;
}
switch (lp->chip_id) {
case LP8550:
case LP8551:
case LP8552:
case LP8553:
case LP8556:
lp->cfg = &lp855x_dev_cfg;
break;
case LP8555:
case LP8557:
lp->cfg = &lp8557_dev_cfg;
break;
default:
return -EINVAL;
}
if (!lp->pdata) {
lp->pdata = devm_kzalloc(dev, sizeof(*lp->pdata), GFP_KERNEL);
if (!lp->pdata)
return -ENOMEM;
if (id) {
ret = lp855x_parse_dt(lp);
if (ret < 0)
return ret;
} else {
ret = lp855x_parse_acpi(lp);
if (ret < 0)
return ret;
}
}
lp->supply = devm_regulator_get(dev, "power");
if (IS_ERR(lp->supply)) {
if (PTR_ERR(lp->supply) == -EPROBE_DEFER)
return -EPROBE_DEFER;
lp->supply = NULL;
}
lp->enable = devm_regulator_get_optional(dev, "enable");
if (IS_ERR(lp->enable)) {
ret = PTR_ERR(lp->enable);
if (ret == -ENODEV)
lp->enable = NULL;
else
return dev_err_probe(dev, ret, "getting enable regulator\n");
}
lp->pwm = devm_pwm_get(lp->dev, lp->chipname);
if (IS_ERR(lp->pwm)) {
ret = PTR_ERR(lp->pwm);
if (ret == -ENODEV || ret == -EINVAL)
lp->pwm = NULL;
else
return dev_err_probe(dev, ret, "getting PWM\n");
lp->needs_pwm_init = false;
lp->mode = REGISTER_BASED;
dev_dbg(dev, "mode: register based\n");
} else {
lp->needs_pwm_init = true;
lp->mode = PWM_BASED;
dev_dbg(dev, "mode: PWM based\n");
}
if (lp->supply) {
ret = regulator_enable(lp->supply);
if (ret < 0) {
dev_err(dev, "failed to enable supply: %d\n", ret);
return ret;
}
}
if (lp->enable) {
ret = regulator_enable(lp->enable);
if (ret < 0) {
dev_err(dev, "failed to enable vddio: %d\n", ret);
goto disable_supply;
}
/*
* LP8555 datasheet says t_RESPONSE (time between VDDIO and
* I2C) is 1ms.
*/
usleep_range(1000, 2000);
}
i2c_set_clientdata(cl, lp);
ret = lp855x_configure(lp);
if (ret) {
dev_err(dev, "device config err: %d", ret);
goto disable_vddio;
}
ret = lp855x_backlight_register(lp);
if (ret) {
dev_err(dev, "failed to register backlight. err: %d\n", ret);
goto disable_vddio;
}
ret = sysfs_create_group(&dev->kobj, &lp855x_attr_group);
if (ret) {
dev_err(dev, "failed to register sysfs. err: %d\n", ret);
goto disable_vddio;
}
backlight_update_status(lp->bl);
return 0;
disable_vddio:
if (lp->enable)
regulator_disable(lp->enable);
disable_supply:
if (lp->supply)
regulator_disable(lp->supply);
return ret;
}
static void lp855x_remove(struct i2c_client *cl)
{
struct lp855x *lp = i2c_get_clientdata(cl);
lp->bl->props.brightness = 0;
backlight_update_status(lp->bl);
if (lp->enable)
regulator_disable(lp->enable);
if (lp->supply)
regulator_disable(lp->supply);
sysfs_remove_group(&lp->dev->kobj, &lp855x_attr_group);
}
static const struct of_device_id lp855x_dt_ids[] __maybe_unused = {
{ .compatible = "ti,lp8550", },
{ .compatible = "ti,lp8551", },
{ .compatible = "ti,lp8552", },
{ .compatible = "ti,lp8553", },
{ .compatible = "ti,lp8555", },
{ .compatible = "ti,lp8556", },
{ .compatible = "ti,lp8557", },
{ }
};
MODULE_DEVICE_TABLE(of, lp855x_dt_ids);
static const struct i2c_device_id lp855x_ids[] = {
{"lp8550", LP8550},
{"lp8551", LP8551},
{"lp8552", LP8552},
{"lp8553", LP8553},
{"lp8555", LP8555},
{"lp8556", LP8556},
{"lp8557", LP8557},
{ }
};
MODULE_DEVICE_TABLE(i2c, lp855x_ids);
#ifdef CONFIG_ACPI
static const struct acpi_device_id lp855x_acpi_match[] = {
/* Xiaomi specific HID used for the LP8556 on the Mi Pad 2 */
{ "XMCC0001", LP8556 },
{ }
};
MODULE_DEVICE_TABLE(acpi, lp855x_acpi_match);
#endif
static struct i2c_driver lp855x_driver = {
.driver = {
.name = "lp855x",
.of_match_table = of_match_ptr(lp855x_dt_ids),
.acpi_match_table = ACPI_PTR(lp855x_acpi_match),
},
.probe = lp855x_probe,
.remove = lp855x_remove,
.id_table = lp855x_ids,
};
module_i2c_driver(lp855x_driver);
MODULE_DESCRIPTION("Texas Instruments LP855x Backlight driver");
MODULE_AUTHOR("Milo Kim <[email protected]>");
MODULE_LICENSE("GPL");
| linux-master | drivers/video/backlight/lp855x_bl.c |
// SPDX-License-Identifier: GPL-2.0-only
#include <dt-bindings/leds/rt4831-backlight.h>
#include <linux/backlight.h>
#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/regmap.h>
#define RT4831_REG_BLCFG 0x02
#define RT4831_REG_BLDIML 0x04
#define RT4831_REG_ENABLE 0x08
#define RT4831_REG_BLOPT2 0x11
#define RT4831_BLMAX_BRIGHTNESS 2048
#define RT4831_BLOVP_MASK GENMASK(7, 5)
#define RT4831_BLOVP_SHIFT 5
#define RT4831_BLPWMEN_MASK BIT(0)
#define RT4831_BLEN_MASK BIT(4)
#define RT4831_BLCH_MASK GENMASK(3, 0)
#define RT4831_BLDIML_MASK GENMASK(2, 0)
#define RT4831_BLDIMH_MASK GENMASK(10, 3)
#define RT4831_BLDIMH_SHIFT 3
#define RT4831_BLOCP_MASK GENMASK(1, 0)
#define RT4831_BLOCP_MINUA 900000
#define RT4831_BLOCP_MAXUA 1800000
#define RT4831_BLOCP_STEPUA 300000
struct rt4831_priv {
struct device *dev;
struct regmap *regmap;
struct backlight_device *bl;
};
static int rt4831_bl_update_status(struct backlight_device *bl_dev)
{
struct rt4831_priv *priv = bl_get_data(bl_dev);
int brightness = backlight_get_brightness(bl_dev);
unsigned int enable = brightness ? RT4831_BLEN_MASK : 0;
u8 v[2];
int ret;
if (brightness) {
v[0] = (brightness - 1) & RT4831_BLDIML_MASK;
v[1] = ((brightness - 1) & RT4831_BLDIMH_MASK) >> RT4831_BLDIMH_SHIFT;
ret = regmap_raw_write(priv->regmap, RT4831_REG_BLDIML, v, sizeof(v));
if (ret)
return ret;
}
return regmap_update_bits(priv->regmap, RT4831_REG_ENABLE, RT4831_BLEN_MASK, enable);
}
static int rt4831_bl_get_brightness(struct backlight_device *bl_dev)
{
struct rt4831_priv *priv = bl_get_data(bl_dev);
unsigned int val;
u8 v[2];
int ret;
ret = regmap_read(priv->regmap, RT4831_REG_ENABLE, &val);
if (ret)
return ret;
if (!(val & RT4831_BLEN_MASK))
return 0;
ret = regmap_raw_read(priv->regmap, RT4831_REG_BLDIML, v, sizeof(v));
if (ret)
return ret;
ret = (v[1] << RT4831_BLDIMH_SHIFT) + (v[0] & RT4831_BLDIML_MASK) + 1;
return ret;
}
static const struct backlight_ops rt4831_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = rt4831_bl_update_status,
.get_brightness = rt4831_bl_get_brightness,
};
static int rt4831_parse_backlight_properties(struct rt4831_priv *priv,
struct backlight_properties *bl_props)
{
struct device *dev = priv->dev;
u8 propval;
u32 brightness, ocp_uA;
unsigned int val = 0;
int ret;
/* common properties */
ret = device_property_read_u32(dev, "max-brightness", &brightness);
if (ret)
brightness = RT4831_BLMAX_BRIGHTNESS;
bl_props->max_brightness = min_t(u32, brightness, RT4831_BLMAX_BRIGHTNESS);
ret = device_property_read_u32(dev, "default-brightness", &brightness);
if (ret)
brightness = bl_props->max_brightness;
bl_props->brightness = min_t(u32, brightness, bl_props->max_brightness);
/* vendor properties */
if (device_property_read_bool(dev, "richtek,pwm-enable"))
val = RT4831_BLPWMEN_MASK;
ret = regmap_update_bits(priv->regmap, RT4831_REG_BLCFG, RT4831_BLPWMEN_MASK, val);
if (ret)
return ret;
ret = device_property_read_u8(dev, "richtek,bled-ovp-sel", &propval);
if (ret)
propval = RT4831_BLOVPLVL_21V;
propval = min_t(u8, propval, RT4831_BLOVPLVL_29V);
ret = regmap_update_bits(priv->regmap, RT4831_REG_BLCFG, RT4831_BLOVP_MASK,
propval << RT4831_BLOVP_SHIFT);
if (ret)
return ret;
/*
* This OCP level is used to protect and limit the inductor current.
* If inductor peak current reach the level, low-side MOSFET will be
* turned off. Meanwhile, the output channel current may be limited.
* To match the configured channel current, the inductor chosen must
* be higher than the OCP level.
*
* Not like the OVP level, the default 21V can be used in the most
* application. But if the chosen OCP level is smaller than needed,
* it will also affect the backlight channel output current to be
* smaller than the register setting.
*/
ret = device_property_read_u32(dev, "richtek,bled-ocp-microamp",
&ocp_uA);
if (!ret) {
ocp_uA = clamp_val(ocp_uA, RT4831_BLOCP_MINUA,
RT4831_BLOCP_MAXUA);
val = DIV_ROUND_UP(ocp_uA - RT4831_BLOCP_MINUA,
RT4831_BLOCP_STEPUA);
ret = regmap_update_bits(priv->regmap, RT4831_REG_BLOPT2,
RT4831_BLOCP_MASK, val);
if (ret)
return ret;
}
ret = device_property_read_u8(dev, "richtek,channel-use", &propval);
if (ret) {
dev_err(dev, "richtek,channel-use DT property missing\n");
return ret;
}
if (!(propval & RT4831_BLCH_MASK)) {
dev_err(dev, "No channel specified\n");
return -EINVAL;
}
return regmap_update_bits(priv->regmap, RT4831_REG_ENABLE, RT4831_BLCH_MASK, propval);
}
static int rt4831_bl_probe(struct platform_device *pdev)
{
struct rt4831_priv *priv;
struct backlight_properties bl_props = { .type = BACKLIGHT_RAW,
.scale = BACKLIGHT_SCALE_LINEAR };
int ret;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->dev = &pdev->dev;
priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!priv->regmap) {
dev_err(&pdev->dev, "Failed to init regmap\n");
return -ENODEV;
}
ret = rt4831_parse_backlight_properties(priv, &bl_props);
if (ret) {
dev_err(&pdev->dev, "Failed to parse backlight properties\n");
return ret;
}
priv->bl = devm_backlight_device_register(&pdev->dev, pdev->name, &pdev->dev, priv,
&rt4831_bl_ops, &bl_props);
if (IS_ERR(priv->bl)) {
dev_err(&pdev->dev, "Failed to register backlight\n");
return PTR_ERR(priv->bl);
}
backlight_update_status(priv->bl);
platform_set_drvdata(pdev, priv);
return 0;
}
static void rt4831_bl_remove(struct platform_device *pdev)
{
struct rt4831_priv *priv = platform_get_drvdata(pdev);
struct backlight_device *bl_dev = priv->bl;
bl_dev->props.brightness = 0;
backlight_update_status(priv->bl);
}
static const struct of_device_id __maybe_unused rt4831_bl_of_match[] = {
{ .compatible = "richtek,rt4831-backlight", },
{}
};
MODULE_DEVICE_TABLE(of, rt4831_bl_of_match);
static struct platform_driver rt4831_bl_driver = {
.driver = {
.name = "rt4831-backlight",
.of_match_table = rt4831_bl_of_match,
},
.probe = rt4831_bl_probe,
.remove_new = rt4831_bl_remove,
};
module_platform_driver(rt4831_bl_driver);
MODULE_AUTHOR("ChiYuan Huang <[email protected]>");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/video/backlight/rt4831-backlight.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* LCD/Backlight Driver for Sharp Zaurus Handhelds (various models)
*
* Copyright (c) 2004-2006 Richard Purdie
*
* Based on Sharp's 2.4 Backlight Driver
*
* Copyright (c) 2008 Marvell International Ltd.
* Converted to SPI device based LCD/Backlight device driver
* by Eric Miao <[email protected]>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/fb.h>
#include <linux/lcd.h>
#include <linux/spi/spi.h>
#include <linux/spi/corgi_lcd.h>
#include <linux/slab.h>
#include <asm/mach/sharpsl_param.h>
#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
/* Register Addresses */
#define RESCTL_ADRS 0x00
#define PHACTRL_ADRS 0x01
#define DUTYCTRL_ADRS 0x02
#define POWERREG0_ADRS 0x03
#define POWERREG1_ADRS 0x04
#define GPOR3_ADRS 0x05
#define PICTRL_ADRS 0x06
#define POLCTRL_ADRS 0x07
/* Register Bit Definitions */
#define RESCTL_QVGA 0x01
#define RESCTL_VGA 0x00
#define POWER1_VW_ON 0x01 /* VW Supply FET ON */
#define POWER1_GVSS_ON 0x02 /* GVSS(-8V) Power Supply ON */
#define POWER1_VDD_ON 0x04 /* VDD(8V),SVSS(-4V) Power Supply ON */
#define POWER1_VW_OFF 0x00 /* VW Supply FET OFF */
#define POWER1_GVSS_OFF 0x00 /* GVSS(-8V) Power Supply OFF */
#define POWER1_VDD_OFF 0x00 /* VDD(8V),SVSS(-4V) Power Supply OFF */
#define POWER0_COM_DCLK 0x01 /* COM Voltage DC Bias DAC Serial Data Clock */
#define POWER0_COM_DOUT 0x02 /* COM Voltage DC Bias DAC Serial Data Out */
#define POWER0_DAC_ON 0x04 /* DAC Power Supply ON */
#define POWER0_COM_ON 0x08 /* COM Power Supply ON */
#define POWER0_VCC5_ON 0x10 /* VCC5 Power Supply ON */
#define POWER0_DAC_OFF 0x00 /* DAC Power Supply OFF */
#define POWER0_COM_OFF 0x00 /* COM Power Supply OFF */
#define POWER0_VCC5_OFF 0x00 /* VCC5 Power Supply OFF */
#define PICTRL_INIT_STATE 0x01
#define PICTRL_INIOFF 0x02
#define PICTRL_POWER_DOWN 0x04
#define PICTRL_COM_SIGNAL_OFF 0x08
#define PICTRL_DAC_SIGNAL_OFF 0x10
#define POLCTRL_SYNC_POL_FALL 0x01
#define POLCTRL_EN_POL_FALL 0x02
#define POLCTRL_DATA_POL_FALL 0x04
#define POLCTRL_SYNC_ACT_H 0x08
#define POLCTRL_EN_ACT_L 0x10
#define POLCTRL_SYNC_POL_RISE 0x00
#define POLCTRL_EN_POL_RISE 0x00
#define POLCTRL_DATA_POL_RISE 0x00
#define POLCTRL_SYNC_ACT_L 0x00
#define POLCTRL_EN_ACT_H 0x00
#define PHACTRL_PHASE_MANUAL 0x01
#define DEFAULT_PHAD_QVGA (9)
#define DEFAULT_COMADJ (125)
struct corgi_lcd {
struct spi_device *spi_dev;
struct lcd_device *lcd_dev;
struct backlight_device *bl_dev;
int limit_mask;
int intensity;
int power;
int mode;
char buf[2];
struct gpio_desc *backlight_on;
struct gpio_desc *backlight_cont;
void (*kick_battery)(void);
};
static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int reg, uint8_t val);
static struct corgi_lcd *the_corgi_lcd;
static unsigned long corgibl_flags;
#define CORGIBL_SUSPENDED 0x01
#define CORGIBL_BATTLOW 0x02
/*
* This is only a pseudo I2C interface. We can't use the standard kernel
* routines as the interface is write only. We just assume the data is acked...
*/
static void lcdtg_ssp_i2c_send(struct corgi_lcd *lcd, uint8_t data)
{
corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, data);
udelay(10);
}
static void lcdtg_i2c_send_bit(struct corgi_lcd *lcd, uint8_t data)
{
lcdtg_ssp_i2c_send(lcd, data);
lcdtg_ssp_i2c_send(lcd, data | POWER0_COM_DCLK);
lcdtg_ssp_i2c_send(lcd, data);
}
static void lcdtg_i2c_send_start(struct corgi_lcd *lcd, uint8_t base)
{
lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT);
lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK);
lcdtg_ssp_i2c_send(lcd, base);
}
static void lcdtg_i2c_send_stop(struct corgi_lcd *lcd, uint8_t base)
{
lcdtg_ssp_i2c_send(lcd, base);
lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK);
lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT);
}
static void lcdtg_i2c_send_byte(struct corgi_lcd *lcd,
uint8_t base, uint8_t data)
{
int i;
for (i = 0; i < 8; i++) {
if (data & 0x80)
lcdtg_i2c_send_bit(lcd, base | POWER0_COM_DOUT);
else
lcdtg_i2c_send_bit(lcd, base);
data <<= 1;
}
}
static void lcdtg_i2c_wait_ack(struct corgi_lcd *lcd, uint8_t base)
{
lcdtg_i2c_send_bit(lcd, base);
}
static void lcdtg_set_common_voltage(struct corgi_lcd *lcd,
uint8_t base_data, uint8_t data)
{
/* Set Common Voltage to M62332FP via I2C */
lcdtg_i2c_send_start(lcd, base_data);
lcdtg_i2c_send_byte(lcd, base_data, 0x9c);
lcdtg_i2c_wait_ack(lcd, base_data);
lcdtg_i2c_send_byte(lcd, base_data, 0x00);
lcdtg_i2c_wait_ack(lcd, base_data);
lcdtg_i2c_send_byte(lcd, base_data, data);
lcdtg_i2c_wait_ack(lcd, base_data);
lcdtg_i2c_send_stop(lcd, base_data);
}
static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int adrs, uint8_t data)
{
struct spi_message msg;
struct spi_transfer xfer = {
.len = 1,
.cs_change = 0,
.tx_buf = lcd->buf,
};
lcd->buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
return spi_sync(lcd->spi_dev, &msg);
}
/* Set Phase Adjust */
static void lcdtg_set_phadadj(struct corgi_lcd *lcd, int mode)
{
int adj;
switch (mode) {
case CORGI_LCD_MODE_VGA:
/* Setting for VGA */
adj = sharpsl_param.phadadj;
adj = (adj < 0) ? PHACTRL_PHASE_MANUAL :
PHACTRL_PHASE_MANUAL | ((adj & 0xf) << 1);
break;
case CORGI_LCD_MODE_QVGA:
default:
/* Setting for QVGA */
adj = (DEFAULT_PHAD_QVGA << 1) | PHACTRL_PHASE_MANUAL;
break;
}
corgi_ssp_lcdtg_send(lcd, PHACTRL_ADRS, adj);
}
static void corgi_lcd_power_on(struct corgi_lcd *lcd)
{
int comadj;
/* Initialize Internal Logic & Port */
corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
PICTRL_POWER_DOWN | PICTRL_INIOFF |
PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF |
PICTRL_DAC_SIGNAL_OFF);
corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_OFF |
POWER0_COM_OFF | POWER0_VCC5_OFF);
corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);
/* VDD(+8V), SVSS(-4V) ON */
corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);
mdelay(3);
/* DAC ON */
corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
POWER0_COM_OFF | POWER0_VCC5_OFF);
/* INIB = H, INI = L */
/* PICTL[0] = H , PICTL[1] = PICTL[2] = PICTL[4] = L */
corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF);
/* Set Common Voltage */
comadj = sharpsl_param.comadj;
if (comadj < 0)
comadj = DEFAULT_COMADJ;
lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
POWER0_VCC5_OFF, comadj);
/* VCC5 ON, DAC ON */
corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
POWER0_COM_OFF | POWER0_VCC5_ON);
/* GVSS(-8V) ON, VDD ON */
corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);
mdelay(2);
/* COM SIGNAL ON (PICTL[3] = L) */
corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_INIT_STATE);
/* COM ON, DAC ON, VCC5_ON */
corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
POWER0_COM_ON | POWER0_VCC5_ON);
/* VW ON, GVSS ON, VDD ON */
corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
POWER1_VW_ON | POWER1_GVSS_ON | POWER1_VDD_ON);
/* Signals output enable */
corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, 0);
/* Set Phase Adjust */
lcdtg_set_phadadj(lcd, lcd->mode);
/* Initialize for Input Signals from ATI */
corgi_ssp_lcdtg_send(lcd, POLCTRL_ADRS,
POLCTRL_SYNC_POL_RISE | POLCTRL_EN_POL_RISE |
POLCTRL_DATA_POL_RISE | POLCTRL_SYNC_ACT_L |
POLCTRL_EN_ACT_H);
udelay(1000);
switch (lcd->mode) {
case CORGI_LCD_MODE_VGA:
corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
break;
case CORGI_LCD_MODE_QVGA:
default:
corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
break;
}
}
static void corgi_lcd_power_off(struct corgi_lcd *lcd)
{
/* 60Hz x 2 frame = 16.7msec x 2 = 33.4 msec */
msleep(34);
/* (1)VW OFF */
corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);
/* (2)COM OFF */
corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_COM_SIGNAL_OFF);
corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_ON);
/* (3)Set Common Voltage Bias 0V */
lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
POWER0_VCC5_ON, 0);
/* (4)GVSS OFF */
corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);
/* (5)VCC5 OFF */
corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_OFF);
/* (6)Set PDWN, INIOFF, DACOFF */
corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
PICTRL_INIOFF | PICTRL_DAC_SIGNAL_OFF |
PICTRL_POWER_DOWN | PICTRL_COM_SIGNAL_OFF);
/* (7)DAC OFF */
corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
POWER0_DAC_OFF | POWER0_COM_OFF | POWER0_VCC5_OFF);
/* (8)VDD OFF */
corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);
}
static int corgi_lcd_set_mode(struct lcd_device *ld, struct fb_videomode *m)
{
struct corgi_lcd *lcd = lcd_get_data(ld);
int mode = CORGI_LCD_MODE_QVGA;
if (m->xres == 640 || m->xres == 480)
mode = CORGI_LCD_MODE_VGA;
if (lcd->mode == mode)
return 0;
lcdtg_set_phadadj(lcd, mode);
switch (mode) {
case CORGI_LCD_MODE_VGA:
corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
break;
case CORGI_LCD_MODE_QVGA:
default:
corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
break;
}
lcd->mode = mode;
return 0;
}
static int corgi_lcd_set_power(struct lcd_device *ld, int power)
{
struct corgi_lcd *lcd = lcd_get_data(ld);
if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
corgi_lcd_power_on(lcd);
if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
corgi_lcd_power_off(lcd);
lcd->power = power;
return 0;
}
static int corgi_lcd_get_power(struct lcd_device *ld)
{
struct corgi_lcd *lcd = lcd_get_data(ld);
return lcd->power;
}
static struct lcd_ops corgi_lcd_ops = {
.get_power = corgi_lcd_get_power,
.set_power = corgi_lcd_set_power,
.set_mode = corgi_lcd_set_mode,
};
static int corgi_bl_get_intensity(struct backlight_device *bd)
{
struct corgi_lcd *lcd = bl_get_data(bd);
return lcd->intensity;
}
static int corgi_bl_set_intensity(struct corgi_lcd *lcd, int intensity)
{
int cont;
if (intensity > 0x10)
intensity += 0x10;
corgi_ssp_lcdtg_send(lcd, DUTYCTRL_ADRS, intensity);
/* Bit 5 via GPIO_BACKLIGHT_CONT */
cont = !!(intensity & 0x20);
if (lcd->backlight_cont)
gpiod_set_value_cansleep(lcd->backlight_cont, cont);
if (lcd->backlight_on)
gpiod_set_value_cansleep(lcd->backlight_on, intensity);
if (lcd->kick_battery)
lcd->kick_battery();
lcd->intensity = intensity;
return 0;
}
static int corgi_bl_update_status(struct backlight_device *bd)
{
struct corgi_lcd *lcd = bl_get_data(bd);
int intensity = backlight_get_brightness(bd);
if (corgibl_flags & CORGIBL_SUSPENDED)
intensity = 0;
if ((corgibl_flags & CORGIBL_BATTLOW) && intensity > lcd->limit_mask)
intensity = lcd->limit_mask;
return corgi_bl_set_intensity(lcd, intensity);
}
void corgi_lcd_limit_intensity(int limit)
{
if (limit)
corgibl_flags |= CORGIBL_BATTLOW;
else
corgibl_flags &= ~CORGIBL_BATTLOW;
backlight_update_status(the_corgi_lcd->bl_dev);
}
EXPORT_SYMBOL(corgi_lcd_limit_intensity);
static const struct backlight_ops corgi_bl_ops = {
.get_brightness = corgi_bl_get_intensity,
.update_status = corgi_bl_update_status,
};
#ifdef CONFIG_PM_SLEEP
static int corgi_lcd_suspend(struct device *dev)
{
struct corgi_lcd *lcd = dev_get_drvdata(dev);
corgibl_flags |= CORGIBL_SUSPENDED;
corgi_bl_set_intensity(lcd, 0);
corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
return 0;
}
static int corgi_lcd_resume(struct device *dev)
{
struct corgi_lcd *lcd = dev_get_drvdata(dev);
corgibl_flags &= ~CORGIBL_SUSPENDED;
corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
backlight_update_status(lcd->bl_dev);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(corgi_lcd_pm_ops, corgi_lcd_suspend, corgi_lcd_resume);
static int setup_gpio_backlight(struct corgi_lcd *lcd,
struct corgi_lcd_platform_data *pdata)
{
struct spi_device *spi = lcd->spi_dev;
lcd->backlight_on = devm_gpiod_get_optional(&spi->dev,
"BL_ON", GPIOD_OUT_LOW);
if (IS_ERR(lcd->backlight_on))
return PTR_ERR(lcd->backlight_on);
lcd->backlight_cont = devm_gpiod_get_optional(&spi->dev, "BL_CONT",
GPIOD_OUT_LOW);
if (IS_ERR(lcd->backlight_cont))
return PTR_ERR(lcd->backlight_cont);
return 0;
}
static int corgi_lcd_probe(struct spi_device *spi)
{
struct backlight_properties props;
struct corgi_lcd_platform_data *pdata = dev_get_platdata(&spi->dev);
struct corgi_lcd *lcd;
int ret = 0;
if (pdata == NULL) {
dev_err(&spi->dev, "platform data not available\n");
return -EINVAL;
}
lcd = devm_kzalloc(&spi->dev, sizeof(struct corgi_lcd), GFP_KERNEL);
if (!lcd)
return -ENOMEM;
lcd->spi_dev = spi;
lcd->lcd_dev = devm_lcd_device_register(&spi->dev, "corgi_lcd",
&spi->dev, lcd, &corgi_lcd_ops);
if (IS_ERR(lcd->lcd_dev))
return PTR_ERR(lcd->lcd_dev);
lcd->power = FB_BLANK_POWERDOWN;
lcd->mode = (pdata) ? pdata->init_mode : CORGI_LCD_MODE_VGA;
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = pdata->max_intensity;
lcd->bl_dev = devm_backlight_device_register(&spi->dev, "corgi_bl",
&spi->dev, lcd, &corgi_bl_ops,
&props);
if (IS_ERR(lcd->bl_dev))
return PTR_ERR(lcd->bl_dev);
lcd->bl_dev->props.brightness = pdata->default_intensity;
lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
ret = setup_gpio_backlight(lcd, pdata);
if (ret)
return ret;
lcd->kick_battery = pdata->kick_battery;
spi_set_drvdata(spi, lcd);
corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
backlight_update_status(lcd->bl_dev);
lcd->limit_mask = pdata->limit_mask;
the_corgi_lcd = lcd;
return 0;
}
static void corgi_lcd_remove(struct spi_device *spi)
{
struct corgi_lcd *lcd = spi_get_drvdata(spi);
lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
lcd->bl_dev->props.brightness = 0;
backlight_update_status(lcd->bl_dev);
corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
}
static struct spi_driver corgi_lcd_driver = {
.driver = {
.name = "corgi-lcd",
.pm = &corgi_lcd_pm_ops,
},
.probe = corgi_lcd_probe,
.remove = corgi_lcd_remove,
};
module_spi_driver(corgi_lcd_driver);
MODULE_DESCRIPTION("LCD and backlight driver for SHARP C7x0/Cxx00");
MODULE_AUTHOR("Eric Miao <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:corgi-lcd");
| linux-master | drivers/video/backlight/corgi_lcd.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Backlight driver for Analog Devices ADP8860 Backlight Devices
*
* Copyright 2009-2010 Analog Devices Inc.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/pm.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/platform_data/adp8860.h>
#define ADP8860_EXT_FEATURES
#define ADP8860_USE_LEDS
#define ADP8860_MFDVID 0x00 /* Manufacturer and device ID */
#define ADP8860_MDCR 0x01 /* Device mode and status */
#define ADP8860_MDCR2 0x02 /* Device mode and Status Register 2 */
#define ADP8860_INTR_EN 0x03 /* Interrupts enable */
#define ADP8860_CFGR 0x04 /* Configuration register */
#define ADP8860_BLSEN 0x05 /* Sink enable backlight or independent */
#define ADP8860_BLOFF 0x06 /* Backlight off timeout */
#define ADP8860_BLDIM 0x07 /* Backlight dim timeout */
#define ADP8860_BLFR 0x08 /* Backlight fade in and out rates */
#define ADP8860_BLMX1 0x09 /* Backlight (Brightness Level 1-daylight) maximum current */
#define ADP8860_BLDM1 0x0A /* Backlight (Brightness Level 1-daylight) dim current */
#define ADP8860_BLMX2 0x0B /* Backlight (Brightness Level 2-office) maximum current */
#define ADP8860_BLDM2 0x0C /* Backlight (Brightness Level 2-office) dim current */
#define ADP8860_BLMX3 0x0D /* Backlight (Brightness Level 3-dark) maximum current */
#define ADP8860_BLDM3 0x0E /* Backlight (Brightness Level 3-dark) dim current */
#define ADP8860_ISCFR 0x0F /* Independent sink current fade control register */
#define ADP8860_ISCC 0x10 /* Independent sink current control register */
#define ADP8860_ISCT1 0x11 /* Independent Sink Current Timer Register LED[7:5] */
#define ADP8860_ISCT2 0x12 /* Independent Sink Current Timer Register LED[4:1] */
#define ADP8860_ISCF 0x13 /* Independent sink current fade register */
#define ADP8860_ISC7 0x14 /* Independent Sink Current LED7 */
#define ADP8860_ISC6 0x15 /* Independent Sink Current LED6 */
#define ADP8860_ISC5 0x16 /* Independent Sink Current LED5 */
#define ADP8860_ISC4 0x17 /* Independent Sink Current LED4 */
#define ADP8860_ISC3 0x18 /* Independent Sink Current LED3 */
#define ADP8860_ISC2 0x19 /* Independent Sink Current LED2 */
#define ADP8860_ISC1 0x1A /* Independent Sink Current LED1 */
#define ADP8860_CCFG 0x1B /* Comparator configuration */
#define ADP8860_CCFG2 0x1C /* Second comparator configuration */
#define ADP8860_L2_TRP 0x1D /* L2 comparator reference */
#define ADP8860_L2_HYS 0x1E /* L2 hysteresis */
#define ADP8860_L3_TRP 0x1F /* L3 comparator reference */
#define ADP8860_L3_HYS 0x20 /* L3 hysteresis */
#define ADP8860_PH1LEVL 0x21 /* First phototransistor ambient light level-low byte register */
#define ADP8860_PH1LEVH 0x22 /* First phototransistor ambient light level-high byte register */
#define ADP8860_PH2LEVL 0x23 /* Second phototransistor ambient light level-low byte register */
#define ADP8860_PH2LEVH 0x24 /* Second phototransistor ambient light level-high byte register */
#define ADP8860_MANUFID 0x0 /* Analog Devices ADP8860 Manufacturer ID */
#define ADP8861_MANUFID 0x4 /* Analog Devices ADP8861 Manufacturer ID */
#define ADP8863_MANUFID 0x2 /* Analog Devices ADP8863 Manufacturer ID */
#define ADP8860_DEVID(x) ((x) & 0xF)
#define ADP8860_MANID(x) ((x) >> 4)
/* MDCR Device mode and status */
#define INT_CFG (1 << 6)
#define NSTBY (1 << 5)
#define DIM_EN (1 << 4)
#define GDWN_DIS (1 << 3)
#define SIS_EN (1 << 2)
#define CMP_AUTOEN (1 << 1)
#define BLEN (1 << 0)
/* ADP8860_CCFG Main ALS comparator level enable */
#define L3_EN (1 << 1)
#define L2_EN (1 << 0)
#define CFGR_BLV_SHIFT 3
#define CFGR_BLV_MASK 0x3
#define ADP8860_FLAG_LED_MASK 0xFF
#define FADE_VAL(in, out) ((0xF & (in)) | ((0xF & (out)) << 4))
#define BL_CFGR_VAL(law, blv) ((((blv) & CFGR_BLV_MASK) << CFGR_BLV_SHIFT) | ((0x3 & (law)) << 1))
#define ALS_CCFG_VAL(filt) ((0x7 & filt) << 5)
enum {
adp8860,
adp8861,
adp8863
};
struct adp8860_led {
struct led_classdev cdev;
struct work_struct work;
struct i2c_client *client;
enum led_brightness new_brightness;
int id;
int flags;
};
struct adp8860_bl {
struct i2c_client *client;
struct backlight_device *bl;
struct adp8860_led *led;
struct adp8860_backlight_platform_data *pdata;
struct mutex lock;
unsigned long cached_daylight_max;
int id;
int revid;
int current_brightness;
unsigned en_ambl_sens:1;
unsigned gdwn_dis:1;
};
static int adp8860_read(struct i2c_client *client, int reg, uint8_t *val)
{
int ret;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0) {
dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
return ret;
}
*val = (uint8_t)ret;
return 0;
}
static int adp8860_write(struct i2c_client *client, u8 reg, u8 val)
{
return i2c_smbus_write_byte_data(client, reg, val);
}
static int adp8860_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
{
struct adp8860_bl *data = i2c_get_clientdata(client);
uint8_t reg_val;
int ret;
mutex_lock(&data->lock);
ret = adp8860_read(client, reg, ®_val);
if (!ret && ((reg_val & bit_mask) != bit_mask)) {
reg_val |= bit_mask;
ret = adp8860_write(client, reg, reg_val);
}
mutex_unlock(&data->lock);
return ret;
}
static int adp8860_clr_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
{
struct adp8860_bl *data = i2c_get_clientdata(client);
uint8_t reg_val;
int ret;
mutex_lock(&data->lock);
ret = adp8860_read(client, reg, ®_val);
if (!ret && (reg_val & bit_mask)) {
reg_val &= ~bit_mask;
ret = adp8860_write(client, reg, reg_val);
}
mutex_unlock(&data->lock);
return ret;
}
/*
* Independent sink / LED
*/
#if defined(ADP8860_USE_LEDS)
static void adp8860_led_work(struct work_struct *work)
{
struct adp8860_led *led = container_of(work, struct adp8860_led, work);
adp8860_write(led->client, ADP8860_ISC1 - led->id + 1,
led->new_brightness >> 1);
}
static void adp8860_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct adp8860_led *led;
led = container_of(led_cdev, struct adp8860_led, cdev);
led->new_brightness = value;
schedule_work(&led->work);
}
static int adp8860_led_setup(struct adp8860_led *led)
{
struct i2c_client *client = led->client;
int ret = 0;
ret = adp8860_write(client, ADP8860_ISC1 - led->id + 1, 0);
ret |= adp8860_set_bits(client, ADP8860_ISCC, 1 << (led->id - 1));
if (led->id > 4)
ret |= adp8860_set_bits(client, ADP8860_ISCT1,
(led->flags & 0x3) << ((led->id - 5) * 2));
else
ret |= adp8860_set_bits(client, ADP8860_ISCT2,
(led->flags & 0x3) << ((led->id - 1) * 2));
return ret;
}
static int adp8860_led_probe(struct i2c_client *client)
{
struct adp8860_backlight_platform_data *pdata =
dev_get_platdata(&client->dev);
struct adp8860_bl *data = i2c_get_clientdata(client);
struct adp8860_led *led, *led_dat;
struct led_info *cur_led;
int ret, i;
led = devm_kcalloc(&client->dev, pdata->num_leds, sizeof(*led),
GFP_KERNEL);
if (led == NULL)
return -ENOMEM;
ret = adp8860_write(client, ADP8860_ISCFR, pdata->led_fade_law);
ret = adp8860_write(client, ADP8860_ISCT1,
(pdata->led_on_time & 0x3) << 6);
ret |= adp8860_write(client, ADP8860_ISCF,
FADE_VAL(pdata->led_fade_in, pdata->led_fade_out));
if (ret) {
dev_err(&client->dev, "failed to write\n");
return ret;
}
for (i = 0; i < pdata->num_leds; ++i) {
cur_led = &pdata->leds[i];
led_dat = &led[i];
led_dat->id = cur_led->flags & ADP8860_FLAG_LED_MASK;
if (led_dat->id > 7 || led_dat->id < 1) {
dev_err(&client->dev, "Invalid LED ID %d\n",
led_dat->id);
ret = -EINVAL;
goto err;
}
if (pdata->bl_led_assign & (1 << (led_dat->id - 1))) {
dev_err(&client->dev, "LED %d used by Backlight\n",
led_dat->id);
ret = -EBUSY;
goto err;
}
led_dat->cdev.name = cur_led->name;
led_dat->cdev.default_trigger = cur_led->default_trigger;
led_dat->cdev.brightness_set = adp8860_led_set;
led_dat->cdev.brightness = LED_OFF;
led_dat->flags = cur_led->flags >> FLAG_OFFT_SHIFT;
led_dat->client = client;
led_dat->new_brightness = LED_OFF;
INIT_WORK(&led_dat->work, adp8860_led_work);
ret = led_classdev_register(&client->dev, &led_dat->cdev);
if (ret) {
dev_err(&client->dev, "failed to register LED %d\n",
led_dat->id);
goto err;
}
ret = adp8860_led_setup(led_dat);
if (ret) {
dev_err(&client->dev, "failed to write\n");
i++;
goto err;
}
}
data->led = led;
return 0;
err:
for (i = i - 1; i >= 0; --i) {
led_classdev_unregister(&led[i].cdev);
cancel_work_sync(&led[i].work);
}
return ret;
}
static int adp8860_led_remove(struct i2c_client *client)
{
struct adp8860_backlight_platform_data *pdata =
dev_get_platdata(&client->dev);
struct adp8860_bl *data = i2c_get_clientdata(client);
int i;
for (i = 0; i < pdata->num_leds; i++) {
led_classdev_unregister(&data->led[i].cdev);
cancel_work_sync(&data->led[i].work);
}
return 0;
}
#else
static int adp8860_led_probe(struct i2c_client *client)
{
return 0;
}
static int adp8860_led_remove(struct i2c_client *client)
{
return 0;
}
#endif
static int adp8860_bl_set(struct backlight_device *bl, int brightness)
{
struct adp8860_bl *data = bl_get_data(bl);
struct i2c_client *client = data->client;
int ret = 0;
if (data->en_ambl_sens) {
if ((brightness > 0) && (brightness < ADP8860_MAX_BRIGHTNESS)) {
/* Disable Ambient Light auto adjust */
ret |= adp8860_clr_bits(client, ADP8860_MDCR,
CMP_AUTOEN);
ret |= adp8860_write(client, ADP8860_BLMX1, brightness);
} else {
/*
* MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
* restore daylight l1 sysfs brightness
*/
ret |= adp8860_write(client, ADP8860_BLMX1,
data->cached_daylight_max);
ret |= adp8860_set_bits(client, ADP8860_MDCR,
CMP_AUTOEN);
}
} else
ret |= adp8860_write(client, ADP8860_BLMX1, brightness);
if (data->current_brightness && brightness == 0)
ret |= adp8860_set_bits(client,
ADP8860_MDCR, DIM_EN);
else if (data->current_brightness == 0 && brightness)
ret |= adp8860_clr_bits(client,
ADP8860_MDCR, DIM_EN);
if (!ret)
data->current_brightness = brightness;
return ret;
}
static int adp8860_bl_update_status(struct backlight_device *bl)
{
return adp8860_bl_set(bl, backlight_get_brightness(bl));
}
static int adp8860_bl_get_brightness(struct backlight_device *bl)
{
struct adp8860_bl *data = bl_get_data(bl);
return data->current_brightness;
}
static const struct backlight_ops adp8860_bl_ops = {
.update_status = adp8860_bl_update_status,
.get_brightness = adp8860_bl_get_brightness,
};
static int adp8860_bl_setup(struct backlight_device *bl)
{
struct adp8860_bl *data = bl_get_data(bl);
struct i2c_client *client = data->client;
struct adp8860_backlight_platform_data *pdata = data->pdata;
int ret = 0;
ret |= adp8860_write(client, ADP8860_BLSEN, ~pdata->bl_led_assign);
ret |= adp8860_write(client, ADP8860_BLMX1, pdata->l1_daylight_max);
ret |= adp8860_write(client, ADP8860_BLDM1, pdata->l1_daylight_dim);
if (data->en_ambl_sens) {
data->cached_daylight_max = pdata->l1_daylight_max;
ret |= adp8860_write(client, ADP8860_BLMX2,
pdata->l2_office_max);
ret |= adp8860_write(client, ADP8860_BLDM2,
pdata->l2_office_dim);
ret |= adp8860_write(client, ADP8860_BLMX3,
pdata->l3_dark_max);
ret |= adp8860_write(client, ADP8860_BLDM3,
pdata->l3_dark_dim);
ret |= adp8860_write(client, ADP8860_L2_TRP, pdata->l2_trip);
ret |= adp8860_write(client, ADP8860_L2_HYS, pdata->l2_hyst);
ret |= adp8860_write(client, ADP8860_L3_TRP, pdata->l3_trip);
ret |= adp8860_write(client, ADP8860_L3_HYS, pdata->l3_hyst);
ret |= adp8860_write(client, ADP8860_CCFG, L2_EN | L3_EN |
ALS_CCFG_VAL(pdata->abml_filt));
}
ret |= adp8860_write(client, ADP8860_CFGR,
BL_CFGR_VAL(pdata->bl_fade_law, 0));
ret |= adp8860_write(client, ADP8860_BLFR, FADE_VAL(pdata->bl_fade_in,
pdata->bl_fade_out));
ret |= adp8860_set_bits(client, ADP8860_MDCR, BLEN | DIM_EN | NSTBY |
(data->gdwn_dis ? GDWN_DIS : 0));
return ret;
}
static ssize_t adp8860_show(struct device *dev, char *buf, int reg)
{
struct adp8860_bl *data = dev_get_drvdata(dev);
int error;
uint8_t reg_val;
mutex_lock(&data->lock);
error = adp8860_read(data->client, reg, ®_val);
mutex_unlock(&data->lock);
if (error < 0)
return error;
return sprintf(buf, "%u\n", reg_val);
}
static ssize_t adp8860_store(struct device *dev, const char *buf,
size_t count, int reg)
{
struct adp8860_bl *data = dev_get_drvdata(dev);
unsigned long val;
int ret;
ret = kstrtoul(buf, 10, &val);
if (ret)
return ret;
mutex_lock(&data->lock);
adp8860_write(data->client, reg, val);
mutex_unlock(&data->lock);
return count;
}
static ssize_t adp8860_bl_l3_dark_max_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp8860_show(dev, buf, ADP8860_BLMX3);
}
static ssize_t adp8860_bl_l3_dark_max_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
return adp8860_store(dev, buf, count, ADP8860_BLMX3);
}
static DEVICE_ATTR(l3_dark_max, 0664, adp8860_bl_l3_dark_max_show,
adp8860_bl_l3_dark_max_store);
static ssize_t adp8860_bl_l2_office_max_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp8860_show(dev, buf, ADP8860_BLMX2);
}
static ssize_t adp8860_bl_l2_office_max_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
return adp8860_store(dev, buf, count, ADP8860_BLMX2);
}
static DEVICE_ATTR(l2_office_max, 0664, adp8860_bl_l2_office_max_show,
adp8860_bl_l2_office_max_store);
static ssize_t adp8860_bl_l1_daylight_max_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp8860_show(dev, buf, ADP8860_BLMX1);
}
static ssize_t adp8860_bl_l1_daylight_max_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct adp8860_bl *data = dev_get_drvdata(dev);
int ret = kstrtoul(buf, 10, &data->cached_daylight_max);
if (ret)
return ret;
return adp8860_store(dev, buf, count, ADP8860_BLMX1);
}
static DEVICE_ATTR(l1_daylight_max, 0664, adp8860_bl_l1_daylight_max_show,
adp8860_bl_l1_daylight_max_store);
static ssize_t adp8860_bl_l3_dark_dim_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp8860_show(dev, buf, ADP8860_BLDM3);
}
static ssize_t adp8860_bl_l3_dark_dim_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
return adp8860_store(dev, buf, count, ADP8860_BLDM3);
}
static DEVICE_ATTR(l3_dark_dim, 0664, adp8860_bl_l3_dark_dim_show,
adp8860_bl_l3_dark_dim_store);
static ssize_t adp8860_bl_l2_office_dim_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp8860_show(dev, buf, ADP8860_BLDM2);
}
static ssize_t adp8860_bl_l2_office_dim_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
return adp8860_store(dev, buf, count, ADP8860_BLDM2);
}
static DEVICE_ATTR(l2_office_dim, 0664, adp8860_bl_l2_office_dim_show,
adp8860_bl_l2_office_dim_store);
static ssize_t adp8860_bl_l1_daylight_dim_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp8860_show(dev, buf, ADP8860_BLDM1);
}
static ssize_t adp8860_bl_l1_daylight_dim_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
return adp8860_store(dev, buf, count, ADP8860_BLDM1);
}
static DEVICE_ATTR(l1_daylight_dim, 0664, adp8860_bl_l1_daylight_dim_show,
adp8860_bl_l1_daylight_dim_store);
#ifdef ADP8860_EXT_FEATURES
static ssize_t adp8860_bl_ambient_light_level_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct adp8860_bl *data = dev_get_drvdata(dev);
int error;
uint8_t reg_val;
uint16_t ret_val;
mutex_lock(&data->lock);
error = adp8860_read(data->client, ADP8860_PH1LEVL, ®_val);
if (!error) {
ret_val = reg_val;
error = adp8860_read(data->client, ADP8860_PH1LEVH, ®_val);
}
mutex_unlock(&data->lock);
if (error)
return error;
/* Return 13-bit conversion value for the first light sensor */
ret_val += (reg_val & 0x1F) << 8;
return sprintf(buf, "%u\n", ret_val);
}
static DEVICE_ATTR(ambient_light_level, 0444,
adp8860_bl_ambient_light_level_show, NULL);
static ssize_t adp8860_bl_ambient_light_zone_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct adp8860_bl *data = dev_get_drvdata(dev);
int error;
uint8_t reg_val;
mutex_lock(&data->lock);
error = adp8860_read(data->client, ADP8860_CFGR, ®_val);
mutex_unlock(&data->lock);
if (error < 0)
return error;
return sprintf(buf, "%u\n",
((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1);
}
static ssize_t adp8860_bl_ambient_light_zone_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct adp8860_bl *data = dev_get_drvdata(dev);
unsigned long val;
uint8_t reg_val;
int ret;
ret = kstrtoul(buf, 10, &val);
if (ret)
return ret;
if (val == 0) {
/* Enable automatic ambient light sensing */
adp8860_set_bits(data->client, ADP8860_MDCR, CMP_AUTOEN);
} else if ((val > 0) && (val <= 3)) {
/* Disable automatic ambient light sensing */
adp8860_clr_bits(data->client, ADP8860_MDCR, CMP_AUTOEN);
/* Set user supplied ambient light zone */
mutex_lock(&data->lock);
ret = adp8860_read(data->client, ADP8860_CFGR, ®_val);
if (!ret) {
reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
reg_val |= (val - 1) << CFGR_BLV_SHIFT;
adp8860_write(data->client, ADP8860_CFGR, reg_val);
}
mutex_unlock(&data->lock);
}
return count;
}
static DEVICE_ATTR(ambient_light_zone, 0664,
adp8860_bl_ambient_light_zone_show,
adp8860_bl_ambient_light_zone_store);
#endif
static struct attribute *adp8860_bl_attributes[] = {
&dev_attr_l3_dark_max.attr,
&dev_attr_l3_dark_dim.attr,
&dev_attr_l2_office_max.attr,
&dev_attr_l2_office_dim.attr,
&dev_attr_l1_daylight_max.attr,
&dev_attr_l1_daylight_dim.attr,
#ifdef ADP8860_EXT_FEATURES
&dev_attr_ambient_light_level.attr,
&dev_attr_ambient_light_zone.attr,
#endif
NULL
};
static const struct attribute_group adp8860_bl_attr_group = {
.attrs = adp8860_bl_attributes,
};
static int adp8860_probe(struct i2c_client *client)
{
const struct i2c_device_id *id = i2c_client_get_device_id(client);
struct backlight_device *bl;
struct adp8860_bl *data;
struct adp8860_backlight_platform_data *pdata =
dev_get_platdata(&client->dev);
struct backlight_properties props;
uint8_t reg_val;
int ret;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
return -EIO;
}
if (!pdata) {
dev_err(&client->dev, "no platform data?\n");
return -EINVAL;
}
data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
ret = adp8860_read(client, ADP8860_MFDVID, ®_val);
if (ret < 0)
return ret;
switch (ADP8860_MANID(reg_val)) {
case ADP8863_MANUFID:
data->gdwn_dis = !!pdata->gdwn_dis;
fallthrough;
case ADP8860_MANUFID:
data->en_ambl_sens = !!pdata->en_ambl_sens;
break;
case ADP8861_MANUFID:
data->gdwn_dis = !!pdata->gdwn_dis;
break;
default:
dev_err(&client->dev, "failed to probe\n");
return -ENODEV;
}
/* It's confirmed that the DEVID field is actually a REVID */
data->revid = ADP8860_DEVID(reg_val);
data->client = client;
data->pdata = pdata;
data->id = id->driver_data;
data->current_brightness = 0;
i2c_set_clientdata(client, data);
memset(&props, 0, sizeof(props));
props.type = BACKLIGHT_RAW;
props.max_brightness = ADP8860_MAX_BRIGHTNESS;
mutex_init(&data->lock);
bl = devm_backlight_device_register(&client->dev,
dev_driver_string(&client->dev),
&client->dev, data, &adp8860_bl_ops, &props);
if (IS_ERR(bl)) {
dev_err(&client->dev, "failed to register backlight\n");
return PTR_ERR(bl);
}
bl->props.brightness = ADP8860_MAX_BRIGHTNESS;
data->bl = bl;
if (data->en_ambl_sens)
ret = sysfs_create_group(&bl->dev.kobj,
&adp8860_bl_attr_group);
if (ret) {
dev_err(&client->dev, "failed to register sysfs\n");
return ret;
}
ret = adp8860_bl_setup(bl);
if (ret) {
ret = -EIO;
goto out;
}
backlight_update_status(bl);
dev_info(&client->dev, "%s Rev.%d Backlight\n",
client->name, data->revid);
if (pdata->num_leds)
adp8860_led_probe(client);
return 0;
out:
if (data->en_ambl_sens)
sysfs_remove_group(&data->bl->dev.kobj,
&adp8860_bl_attr_group);
return ret;
}
static void adp8860_remove(struct i2c_client *client)
{
struct adp8860_bl *data = i2c_get_clientdata(client);
adp8860_clr_bits(client, ADP8860_MDCR, NSTBY);
if (data->led)
adp8860_led_remove(client);
if (data->en_ambl_sens)
sysfs_remove_group(&data->bl->dev.kobj,
&adp8860_bl_attr_group);
}
#ifdef CONFIG_PM_SLEEP
static int adp8860_i2c_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
adp8860_clr_bits(client, ADP8860_MDCR, NSTBY);
return 0;
}
static int adp8860_i2c_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
adp8860_set_bits(client, ADP8860_MDCR, NSTBY | BLEN);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(adp8860_i2c_pm_ops, adp8860_i2c_suspend,
adp8860_i2c_resume);
static const struct i2c_device_id adp8860_id[] = {
{ "adp8860", adp8860 },
{ "adp8861", adp8861 },
{ "adp8863", adp8863 },
{ }
};
MODULE_DEVICE_TABLE(i2c, adp8860_id);
static struct i2c_driver adp8860_driver = {
.driver = {
.name = KBUILD_MODNAME,
.pm = &adp8860_i2c_pm_ops,
},
.probe = adp8860_probe,
.remove = adp8860_remove,
.id_table = adp8860_id,
};
module_i2c_driver(adp8860_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Michael Hennerich <[email protected]>");
MODULE_DESCRIPTION("ADP8860 Backlight driver");
| linux-master | drivers/video/backlight/adp8860_bl.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Backlight driver for Marvell Semiconductor 88PM8606
*
* Copyright (C) 2009 Marvell International Ltd.
* Haojian Zhuang <[email protected]>
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/i2c.h>
#include <linux/backlight.h>
#include <linux/mfd/88pm860x.h>
#include <linux/module.h>
#define MAX_BRIGHTNESS (0xFF)
#define MIN_BRIGHTNESS (0)
#define CURRENT_BITMASK (0x1F << 1)
struct pm860x_backlight_data {
struct pm860x_chip *chip;
struct i2c_client *i2c;
int current_brightness;
int port;
int pwm;
int iset;
int reg_duty_cycle;
int reg_always_on;
int reg_current;
};
static int backlight_power_set(struct pm860x_chip *chip, int port,
int on)
{
int ret = -EINVAL;
switch (port) {
case 0:
ret = on ? pm8606_osc_enable(chip, WLED1_DUTY) :
pm8606_osc_disable(chip, WLED1_DUTY);
break;
case 1:
ret = on ? pm8606_osc_enable(chip, WLED2_DUTY) :
pm8606_osc_disable(chip, WLED2_DUTY);
break;
case 2:
ret = on ? pm8606_osc_enable(chip, WLED3_DUTY) :
pm8606_osc_disable(chip, WLED3_DUTY);
break;
}
return ret;
}
static int pm860x_backlight_set(struct backlight_device *bl, int brightness)
{
struct pm860x_backlight_data *data = bl_get_data(bl);
struct pm860x_chip *chip = data->chip;
unsigned char value;
int ret;
if (brightness > MAX_BRIGHTNESS)
value = MAX_BRIGHTNESS;
else
value = brightness;
if (brightness)
backlight_power_set(chip, data->port, 1);
ret = pm860x_reg_write(data->i2c, data->reg_duty_cycle, value);
if (ret < 0)
goto out;
if ((data->current_brightness == 0) && brightness) {
if (data->iset) {
ret = pm860x_set_bits(data->i2c, data->reg_current,
CURRENT_BITMASK, data->iset);
if (ret < 0)
goto out;
}
if (data->pwm) {
ret = pm860x_set_bits(data->i2c, PM8606_PWM,
PM8606_PWM_FREQ_MASK, data->pwm);
if (ret < 0)
goto out;
}
if (brightness == MAX_BRIGHTNESS) {
/* set WLED_ON bit as 100% */
ret = pm860x_set_bits(data->i2c, data->reg_always_on,
PM8606_WLED_ON, PM8606_WLED_ON);
}
} else {
if (brightness == MAX_BRIGHTNESS) {
/* set WLED_ON bit as 100% */
ret = pm860x_set_bits(data->i2c, data->reg_always_on,
PM8606_WLED_ON, PM8606_WLED_ON);
} else {
/* clear WLED_ON bit since it's not 100% */
ret = pm860x_set_bits(data->i2c, data->reg_always_on,
PM8606_WLED_ON, 0);
}
}
if (ret < 0)
goto out;
if (brightness == 0)
backlight_power_set(chip, data->port, 0);
dev_dbg(chip->dev, "set brightness %d\n", value);
data->current_brightness = value;
return 0;
out:
dev_dbg(chip->dev, "set brightness %d failure with return value: %d\n",
value, ret);
return ret;
}
static int pm860x_backlight_update_status(struct backlight_device *bl)
{
return pm860x_backlight_set(bl, backlight_get_brightness(bl));
}
static int pm860x_backlight_get_brightness(struct backlight_device *bl)
{
struct pm860x_backlight_data *data = bl_get_data(bl);
struct pm860x_chip *chip = data->chip;
int ret;
ret = pm860x_reg_read(data->i2c, data->reg_duty_cycle);
if (ret < 0)
goto out;
data->current_brightness = ret;
dev_dbg(chip->dev, "get brightness %d\n", data->current_brightness);
return data->current_brightness;
out:
return -EINVAL;
}
static const struct backlight_ops pm860x_backlight_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = pm860x_backlight_update_status,
.get_brightness = pm860x_backlight_get_brightness,
};
#ifdef CONFIG_OF
static int pm860x_backlight_dt_init(struct platform_device *pdev,
struct pm860x_backlight_data *data,
char *name)
{
struct device_node *nproot, *np;
int iset = 0;
nproot = of_get_child_by_name(pdev->dev.parent->of_node, "backlights");
if (!nproot) {
dev_err(&pdev->dev, "failed to find backlights node\n");
return -ENODEV;
}
for_each_child_of_node(nproot, np) {
if (of_node_name_eq(np, name)) {
of_property_read_u32(np, "marvell,88pm860x-iset",
&iset);
data->iset = PM8606_WLED_CURRENT(iset);
of_property_read_u32(np, "marvell,88pm860x-pwm",
&data->pwm);
of_node_put(np);
break;
}
}
of_node_put(nproot);
return 0;
}
#else
#define pm860x_backlight_dt_init(x, y, z) (-1)
#endif
static int pm860x_backlight_probe(struct platform_device *pdev)
{
struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
struct pm860x_backlight_pdata *pdata = dev_get_platdata(&pdev->dev);
struct pm860x_backlight_data *data;
struct backlight_device *bl;
struct resource *res;
struct backlight_properties props;
char name[MFD_NAME_SIZE];
int ret = 0;
data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_backlight_data),
GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
res = platform_get_resource_byname(pdev, IORESOURCE_REG, "duty cycle");
if (!res) {
dev_err(&pdev->dev, "No REG resource for duty cycle\n");
return -ENXIO;
}
data->reg_duty_cycle = res->start;
res = platform_get_resource_byname(pdev, IORESOURCE_REG, "always on");
if (!res) {
dev_err(&pdev->dev, "No REG resource for always on\n");
return -ENXIO;
}
data->reg_always_on = res->start;
res = platform_get_resource_byname(pdev, IORESOURCE_REG, "current");
if (!res) {
dev_err(&pdev->dev, "No REG resource for current\n");
return -ENXIO;
}
data->reg_current = res->start;
memset(name, 0, MFD_NAME_SIZE);
sprintf(name, "backlight-%d", pdev->id);
data->port = pdev->id;
data->chip = chip;
data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
data->current_brightness = MAX_BRIGHTNESS;
if (pm860x_backlight_dt_init(pdev, data, name)) {
if (pdata) {
data->pwm = pdata->pwm;
data->iset = pdata->iset;
}
}
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = MAX_BRIGHTNESS;
bl = devm_backlight_device_register(&pdev->dev, name, &pdev->dev, data,
&pm860x_backlight_ops, &props);
if (IS_ERR(bl)) {
dev_err(&pdev->dev, "failed to register backlight\n");
return PTR_ERR(bl);
}
bl->props.brightness = MAX_BRIGHTNESS;
platform_set_drvdata(pdev, bl);
/* read current backlight */
ret = pm860x_backlight_get_brightness(bl);
if (ret < 0)
return ret;
backlight_update_status(bl);
return 0;
}
static struct platform_driver pm860x_backlight_driver = {
.driver = {
.name = "88pm860x-backlight",
},
.probe = pm860x_backlight_probe,
};
module_platform_driver(pm860x_backlight_driver);
MODULE_DESCRIPTION("Backlight Driver for Marvell Semiconductor 88PM8606");
MODULE_AUTHOR("Haojian Zhuang <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:88pm860x-backlight");
| linux-master | drivers/video/backlight/88pm860x_bl.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Backlight Driver for the KB3886 Backlight
*
* Copyright (c) 2007-2008 Claudio Nieder
*
* Based on corgi_bl.c by Richard Purdie and kb3886 driver by Robert Woerle
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/dmi.h>
#define KB3886_PARENT 0x64
#define KB3886_IO 0x60
#define KB3886_ADC_DAC_PWM 0xC4
#define KB3886_PWM0_WRITE 0x81
#define KB3886_PWM0_READ 0x41
static DEFINE_MUTEX(bl_mutex);
static void kb3886_bl_set_intensity(int intensity)
{
mutex_lock(&bl_mutex);
intensity = intensity&0xff;
outb(KB3886_ADC_DAC_PWM, KB3886_PARENT);
usleep_range(10000, 11000);
outb(KB3886_PWM0_WRITE, KB3886_IO);
usleep_range(10000, 11000);
outb(intensity, KB3886_IO);
mutex_unlock(&bl_mutex);
}
struct kb3886bl_machinfo {
int max_intensity;
int default_intensity;
int limit_mask;
void (*set_bl_intensity)(int intensity);
};
static struct kb3886bl_machinfo kb3886_bl_machinfo = {
.max_intensity = 0xff,
.default_intensity = 0xa0,
.limit_mask = 0x7f,
.set_bl_intensity = kb3886_bl_set_intensity,
};
static struct platform_device kb3886bl_device = {
.name = "kb3886-bl",
.dev = {
.platform_data = &kb3886_bl_machinfo,
},
.id = -1,
};
static struct platform_device *devices[] __initdata = {
&kb3886bl_device,
};
/*
* Back to driver
*/
static int kb3886bl_intensity;
static struct backlight_device *kb3886_backlight_device;
static struct kb3886bl_machinfo *bl_machinfo;
static unsigned long kb3886bl_flags;
#define KB3886BL_SUSPENDED 0x01
static const struct dmi_system_id kb3886bl_device_table[] __initconst = {
{
.ident = "Sahara Touch-iT",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SDV"),
DMI_MATCH(DMI_PRODUCT_NAME, "iTouch T201"),
},
},
{ }
};
static int kb3886bl_send_intensity(struct backlight_device *bd)
{
int intensity = backlight_get_brightness(bd);
if (kb3886bl_flags & KB3886BL_SUSPENDED)
intensity = 0;
bl_machinfo->set_bl_intensity(intensity);
kb3886bl_intensity = intensity;
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int kb3886bl_suspend(struct device *dev)
{
struct backlight_device *bd = dev_get_drvdata(dev);
kb3886bl_flags |= KB3886BL_SUSPENDED;
backlight_update_status(bd);
return 0;
}
static int kb3886bl_resume(struct device *dev)
{
struct backlight_device *bd = dev_get_drvdata(dev);
kb3886bl_flags &= ~KB3886BL_SUSPENDED;
backlight_update_status(bd);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(kb3886bl_pm_ops, kb3886bl_suspend, kb3886bl_resume);
static int kb3886bl_get_intensity(struct backlight_device *bd)
{
return kb3886bl_intensity;
}
static const struct backlight_ops kb3886bl_ops = {
.get_brightness = kb3886bl_get_intensity,
.update_status = kb3886bl_send_intensity,
};
static int kb3886bl_probe(struct platform_device *pdev)
{
struct backlight_properties props;
struct kb3886bl_machinfo *machinfo = dev_get_platdata(&pdev->dev);
bl_machinfo = machinfo;
if (!machinfo->limit_mask)
machinfo->limit_mask = -1;
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = machinfo->max_intensity;
kb3886_backlight_device = devm_backlight_device_register(&pdev->dev,
"kb3886-bl", &pdev->dev,
NULL, &kb3886bl_ops,
&props);
if (IS_ERR(kb3886_backlight_device))
return PTR_ERR(kb3886_backlight_device);
platform_set_drvdata(pdev, kb3886_backlight_device);
kb3886_backlight_device->props.power = FB_BLANK_UNBLANK;
kb3886_backlight_device->props.brightness = machinfo->default_intensity;
backlight_update_status(kb3886_backlight_device);
return 0;
}
static struct platform_driver kb3886bl_driver = {
.probe = kb3886bl_probe,
.driver = {
.name = "kb3886-bl",
.pm = &kb3886bl_pm_ops,
},
};
static int __init kb3886_init(void)
{
if (!dmi_check_system(kb3886bl_device_table))
return -ENODEV;
platform_add_devices(devices, ARRAY_SIZE(devices));
return platform_driver_register(&kb3886bl_driver);
}
static void __exit kb3886_exit(void)
{
platform_driver_unregister(&kb3886bl_driver);
}
module_init(kb3886_init);
module_exit(kb3886_exit);
MODULE_AUTHOR("Claudio Nieder <[email protected]>");
MODULE_DESCRIPTION("Tabletkiosk Sahara Touch-iT Backlight Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("dmi:*:svnSDV:pniTouchT201:*");
| linux-master | drivers/video/backlight/kb3886_bl.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Backlight driver for Analog Devices ADP5520/ADP5501 MFD PMICs
*
* Copyright 2009 Analog Devices Inc.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/mfd/adp5520.h>
#include <linux/slab.h>
#include <linux/module.h>
struct adp5520_bl {
struct device *master;
struct adp5520_backlight_platform_data *pdata;
struct mutex lock;
unsigned long cached_daylight_max;
int id;
int current_brightness;
};
static int adp5520_bl_set(struct backlight_device *bl, int brightness)
{
struct adp5520_bl *data = bl_get_data(bl);
struct device *master = data->master;
int ret = 0;
if (data->pdata->en_ambl_sens) {
if ((brightness > 0) && (brightness < ADP5020_MAX_BRIGHTNESS)) {
/* Disable Ambient Light auto adjust */
ret |= adp5520_clr_bits(master, ADP5520_BL_CONTROL,
ADP5520_BL_AUTO_ADJ);
ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
brightness);
} else {
/*
* MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
* restore daylight l3 sysfs brightness
*/
ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
data->cached_daylight_max);
ret |= adp5520_set_bits(master, ADP5520_BL_CONTROL,
ADP5520_BL_AUTO_ADJ);
}
} else {
ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX, brightness);
}
if (data->current_brightness && brightness == 0)
ret |= adp5520_set_bits(master,
ADP5520_MODE_STATUS, ADP5520_DIM_EN);
else if (data->current_brightness == 0 && brightness)
ret |= adp5520_clr_bits(master,
ADP5520_MODE_STATUS, ADP5520_DIM_EN);
if (!ret)
data->current_brightness = brightness;
return ret;
}
static int adp5520_bl_update_status(struct backlight_device *bl)
{
return adp5520_bl_set(bl, backlight_get_brightness(bl));
}
static int adp5520_bl_get_brightness(struct backlight_device *bl)
{
struct adp5520_bl *data = bl_get_data(bl);
int error;
uint8_t reg_val;
error = adp5520_read(data->master, ADP5520_BL_VALUE, ®_val);
return error ? data->current_brightness : reg_val;
}
static const struct backlight_ops adp5520_bl_ops = {
.update_status = adp5520_bl_update_status,
.get_brightness = adp5520_bl_get_brightness,
};
static int adp5520_bl_setup(struct backlight_device *bl)
{
struct adp5520_bl *data = bl_get_data(bl);
struct device *master = data->master;
struct adp5520_backlight_platform_data *pdata = data->pdata;
int ret = 0;
ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
pdata->l1_daylight_max);
ret |= adp5520_write(master, ADP5520_DAYLIGHT_DIM,
pdata->l1_daylight_dim);
if (pdata->en_ambl_sens) {
data->cached_daylight_max = pdata->l1_daylight_max;
ret |= adp5520_write(master, ADP5520_OFFICE_MAX,
pdata->l2_office_max);
ret |= adp5520_write(master, ADP5520_OFFICE_DIM,
pdata->l2_office_dim);
ret |= adp5520_write(master, ADP5520_DARK_MAX,
pdata->l3_dark_max);
ret |= adp5520_write(master, ADP5520_DARK_DIM,
pdata->l3_dark_dim);
ret |= adp5520_write(master, ADP5520_L2_TRIP,
pdata->l2_trip);
ret |= adp5520_write(master, ADP5520_L2_HYS,
pdata->l2_hyst);
ret |= adp5520_write(master, ADP5520_L3_TRIP,
pdata->l3_trip);
ret |= adp5520_write(master, ADP5520_L3_HYS,
pdata->l3_hyst);
ret |= adp5520_write(master, ADP5520_ALS_CMPR_CFG,
ALS_CMPR_CFG_VAL(pdata->abml_filt,
ADP5520_L3_EN));
}
ret |= adp5520_write(master, ADP5520_BL_CONTROL,
BL_CTRL_VAL(pdata->fade_led_law,
pdata->en_ambl_sens));
ret |= adp5520_write(master, ADP5520_BL_FADE, FADE_VAL(pdata->fade_in,
pdata->fade_out));
ret |= adp5520_set_bits(master, ADP5520_MODE_STATUS,
ADP5520_BL_EN | ADP5520_DIM_EN);
return ret;
}
static ssize_t adp5520_show(struct device *dev, char *buf, int reg)
{
struct adp5520_bl *data = dev_get_drvdata(dev);
int ret;
uint8_t reg_val;
mutex_lock(&data->lock);
ret = adp5520_read(data->master, reg, ®_val);
mutex_unlock(&data->lock);
if (ret < 0)
return ret;
return sprintf(buf, "%u\n", reg_val);
}
static ssize_t adp5520_store(struct device *dev, const char *buf,
size_t count, int reg)
{
struct adp5520_bl *data = dev_get_drvdata(dev);
unsigned long val;
int ret;
ret = kstrtoul(buf, 10, &val);
if (ret)
return ret;
mutex_lock(&data->lock);
adp5520_write(data->master, reg, val);
mutex_unlock(&data->lock);
return count;
}
static ssize_t adp5520_bl_dark_max_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp5520_show(dev, buf, ADP5520_DARK_MAX);
}
static ssize_t adp5520_bl_dark_max_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
return adp5520_store(dev, buf, count, ADP5520_DARK_MAX);
}
static DEVICE_ATTR(dark_max, 0664, adp5520_bl_dark_max_show,
adp5520_bl_dark_max_store);
static ssize_t adp5520_bl_office_max_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp5520_show(dev, buf, ADP5520_OFFICE_MAX);
}
static ssize_t adp5520_bl_office_max_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
return adp5520_store(dev, buf, count, ADP5520_OFFICE_MAX);
}
static DEVICE_ATTR(office_max, 0664, adp5520_bl_office_max_show,
adp5520_bl_office_max_store);
static ssize_t adp5520_bl_daylight_max_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp5520_show(dev, buf, ADP5520_DAYLIGHT_MAX);
}
static ssize_t adp5520_bl_daylight_max_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct adp5520_bl *data = dev_get_drvdata(dev);
int ret;
ret = kstrtoul(buf, 10, &data->cached_daylight_max);
if (ret < 0)
return ret;
return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_MAX);
}
static DEVICE_ATTR(daylight_max, 0664, adp5520_bl_daylight_max_show,
adp5520_bl_daylight_max_store);
static ssize_t adp5520_bl_dark_dim_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp5520_show(dev, buf, ADP5520_DARK_DIM);
}
static ssize_t adp5520_bl_dark_dim_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
return adp5520_store(dev, buf, count, ADP5520_DARK_DIM);
}
static DEVICE_ATTR(dark_dim, 0664, adp5520_bl_dark_dim_show,
adp5520_bl_dark_dim_store);
static ssize_t adp5520_bl_office_dim_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp5520_show(dev, buf, ADP5520_OFFICE_DIM);
}
static ssize_t adp5520_bl_office_dim_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
return adp5520_store(dev, buf, count, ADP5520_OFFICE_DIM);
}
static DEVICE_ATTR(office_dim, 0664, adp5520_bl_office_dim_show,
adp5520_bl_office_dim_store);
static ssize_t adp5520_bl_daylight_dim_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp5520_show(dev, buf, ADP5520_DAYLIGHT_DIM);
}
static ssize_t adp5520_bl_daylight_dim_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_DIM);
}
static DEVICE_ATTR(daylight_dim, 0664, adp5520_bl_daylight_dim_show,
adp5520_bl_daylight_dim_store);
static struct attribute *adp5520_bl_attributes[] = {
&dev_attr_dark_max.attr,
&dev_attr_dark_dim.attr,
&dev_attr_office_max.attr,
&dev_attr_office_dim.attr,
&dev_attr_daylight_max.attr,
&dev_attr_daylight_dim.attr,
NULL
};
static const struct attribute_group adp5520_bl_attr_group = {
.attrs = adp5520_bl_attributes,
};
static int adp5520_bl_probe(struct platform_device *pdev)
{
struct backlight_properties props;
struct backlight_device *bl;
struct adp5520_bl *data;
int ret = 0;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
data->master = pdev->dev.parent;
data->pdata = dev_get_platdata(&pdev->dev);
if (data->pdata == NULL) {
dev_err(&pdev->dev, "missing platform data\n");
return -ENODEV;
}
data->id = pdev->id;
data->current_brightness = 0;
mutex_init(&data->lock);
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = ADP5020_MAX_BRIGHTNESS;
bl = devm_backlight_device_register(&pdev->dev, pdev->name,
data->master, data, &adp5520_bl_ops,
&props);
if (IS_ERR(bl)) {
dev_err(&pdev->dev, "failed to register backlight\n");
return PTR_ERR(bl);
}
bl->props.brightness = ADP5020_MAX_BRIGHTNESS;
if (data->pdata->en_ambl_sens)
ret = sysfs_create_group(&bl->dev.kobj,
&adp5520_bl_attr_group);
if (ret) {
dev_err(&pdev->dev, "failed to register sysfs\n");
return ret;
}
platform_set_drvdata(pdev, bl);
ret = adp5520_bl_setup(bl);
if (ret) {
dev_err(&pdev->dev, "failed to setup\n");
if (data->pdata->en_ambl_sens)
sysfs_remove_group(&bl->dev.kobj,
&adp5520_bl_attr_group);
return ret;
}
backlight_update_status(bl);
return 0;
}
static void adp5520_bl_remove(struct platform_device *pdev)
{
struct backlight_device *bl = platform_get_drvdata(pdev);
struct adp5520_bl *data = bl_get_data(bl);
adp5520_clr_bits(data->master, ADP5520_MODE_STATUS, ADP5520_BL_EN);
if (data->pdata->en_ambl_sens)
sysfs_remove_group(&bl->dev.kobj,
&adp5520_bl_attr_group);
}
#ifdef CONFIG_PM_SLEEP
static int adp5520_bl_suspend(struct device *dev)
{
struct backlight_device *bl = dev_get_drvdata(dev);
return adp5520_bl_set(bl, 0);
}
static int adp5520_bl_resume(struct device *dev)
{
struct backlight_device *bl = dev_get_drvdata(dev);
backlight_update_status(bl);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(adp5520_bl_pm_ops, adp5520_bl_suspend,
adp5520_bl_resume);
static struct platform_driver adp5520_bl_driver = {
.driver = {
.name = "adp5520-backlight",
.pm = &adp5520_bl_pm_ops,
},
.probe = adp5520_bl_probe,
.remove_new = adp5520_bl_remove,
};
module_platform_driver(adp5520_bl_driver);
MODULE_AUTHOR("Michael Hennerich <[email protected]>");
MODULE_DESCRIPTION("ADP5520(01) Backlight Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:adp5520-backlight");
| linux-master | drivers/video/backlight/adp5520_bl.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ams369fg06 AMOLED LCD panel driver.
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* Author: Jingoo Han <[email protected]>
*
* Derived from drivers/video/s6e63m0.c
*/
#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/lcd.h>
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <linux/wait.h>
#define SLEEPMSEC 0x1000
#define ENDDEF 0x2000
#define DEFMASK 0xFF00
#define COMMAND_ONLY 0xFE
#define DATA_ONLY 0xFF
#define MAX_GAMMA_LEVEL 5
#define GAMMA_TABLE_COUNT 21
#define MIN_BRIGHTNESS 0
#define MAX_BRIGHTNESS 255
#define DEFAULT_BRIGHTNESS 150
struct ams369fg06 {
struct device *dev;
struct spi_device *spi;
unsigned int power;
struct lcd_device *ld;
struct backlight_device *bd;
struct lcd_platform_data *lcd_pd;
};
static const unsigned short seq_display_on[] = {
0x14, 0x03,
ENDDEF, 0x0000
};
static const unsigned short seq_display_off[] = {
0x14, 0x00,
ENDDEF, 0x0000
};
static const unsigned short seq_stand_by_on[] = {
0x1D, 0xA1,
SLEEPMSEC, 200,
ENDDEF, 0x0000
};
static const unsigned short seq_stand_by_off[] = {
0x1D, 0xA0,
SLEEPMSEC, 250,
ENDDEF, 0x0000
};
static const unsigned short seq_setting[] = {
0x31, 0x08,
0x32, 0x14,
0x30, 0x02,
0x27, 0x01,
0x12, 0x08,
0x13, 0x08,
0x15, 0x00,
0x16, 0x00,
0xef, 0xd0,
DATA_ONLY, 0xe8,
0x39, 0x44,
0x40, 0x00,
0x41, 0x3f,
0x42, 0x2a,
0x43, 0x27,
0x44, 0x27,
0x45, 0x1f,
0x46, 0x44,
0x50, 0x00,
0x51, 0x00,
0x52, 0x17,
0x53, 0x24,
0x54, 0x26,
0x55, 0x1f,
0x56, 0x43,
0x60, 0x00,
0x61, 0x3f,
0x62, 0x2a,
0x63, 0x25,
0x64, 0x24,
0x65, 0x1b,
0x66, 0x5c,
0x17, 0x22,
0x18, 0x33,
0x19, 0x03,
0x1a, 0x01,
0x22, 0xa4,
0x23, 0x00,
0x26, 0xa0,
0x1d, 0xa0,
SLEEPMSEC, 300,
0x14, 0x03,
ENDDEF, 0x0000
};
/* gamma value: 2.2 */
static const unsigned int ams369fg06_22_250[] = {
0x00, 0x3f, 0x2a, 0x27, 0x27, 0x1f, 0x44,
0x00, 0x00, 0x17, 0x24, 0x26, 0x1f, 0x43,
0x00, 0x3f, 0x2a, 0x25, 0x24, 0x1b, 0x5c,
};
static const unsigned int ams369fg06_22_200[] = {
0x00, 0x3f, 0x28, 0x29, 0x27, 0x21, 0x3e,
0x00, 0x00, 0x10, 0x25, 0x27, 0x20, 0x3d,
0x00, 0x3f, 0x28, 0x27, 0x25, 0x1d, 0x53,
};
static const unsigned int ams369fg06_22_150[] = {
0x00, 0x3f, 0x2d, 0x29, 0x28, 0x23, 0x37,
0x00, 0x00, 0x0b, 0x25, 0x28, 0x22, 0x36,
0x00, 0x3f, 0x2b, 0x28, 0x26, 0x1f, 0x4a,
};
static const unsigned int ams369fg06_22_100[] = {
0x00, 0x3f, 0x30, 0x2a, 0x2b, 0x24, 0x2f,
0x00, 0x00, 0x00, 0x25, 0x29, 0x24, 0x2e,
0x00, 0x3f, 0x2f, 0x29, 0x29, 0x21, 0x3f,
};
static const unsigned int ams369fg06_22_50[] = {
0x00, 0x3f, 0x3c, 0x2c, 0x2d, 0x27, 0x24,
0x00, 0x00, 0x00, 0x22, 0x2a, 0x27, 0x23,
0x00, 0x3f, 0x3b, 0x2c, 0x2b, 0x24, 0x31,
};
struct ams369fg06_gamma {
unsigned int *gamma_22_table[MAX_GAMMA_LEVEL];
};
static struct ams369fg06_gamma gamma_table = {
.gamma_22_table[0] = (unsigned int *)&ams369fg06_22_50,
.gamma_22_table[1] = (unsigned int *)&ams369fg06_22_100,
.gamma_22_table[2] = (unsigned int *)&ams369fg06_22_150,
.gamma_22_table[3] = (unsigned int *)&ams369fg06_22_200,
.gamma_22_table[4] = (unsigned int *)&ams369fg06_22_250,
};
static int ams369fg06_spi_write_byte(struct ams369fg06 *lcd, int addr, int data)
{
u16 buf[1];
struct spi_message msg;
struct spi_transfer xfer = {
.len = 2,
.tx_buf = buf,
};
buf[0] = (addr << 8) | data;
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
return spi_sync(lcd->spi, &msg);
}
static int ams369fg06_spi_write(struct ams369fg06 *lcd, unsigned char address,
unsigned char command)
{
int ret = 0;
if (address != DATA_ONLY)
ret = ams369fg06_spi_write_byte(lcd, 0x70, address);
if (command != COMMAND_ONLY)
ret = ams369fg06_spi_write_byte(lcd, 0x72, command);
return ret;
}
static int ams369fg06_panel_send_sequence(struct ams369fg06 *lcd,
const unsigned short *wbuf)
{
int ret = 0, i = 0;
while ((wbuf[i] & DEFMASK) != ENDDEF) {
if ((wbuf[i] & DEFMASK) != SLEEPMSEC) {
ret = ams369fg06_spi_write(lcd, wbuf[i], wbuf[i+1]);
if (ret)
break;
} else {
msleep(wbuf[i+1]);
}
i += 2;
}
return ret;
}
static int _ams369fg06_gamma_ctl(struct ams369fg06 *lcd,
const unsigned int *gamma)
{
unsigned int i = 0;
int ret = 0;
for (i = 0 ; i < GAMMA_TABLE_COUNT / 3; i++) {
ret = ams369fg06_spi_write(lcd, 0x40 + i, gamma[i]);
ret = ams369fg06_spi_write(lcd, 0x50 + i, gamma[i+7*1]);
ret = ams369fg06_spi_write(lcd, 0x60 + i, gamma[i+7*2]);
if (ret) {
dev_err(lcd->dev, "failed to set gamma table.\n");
goto gamma_err;
}
}
gamma_err:
return ret;
}
static int ams369fg06_gamma_ctl(struct ams369fg06 *lcd, int brightness)
{
int ret = 0;
int gamma = 0;
if ((brightness >= 0) && (brightness <= 50))
gamma = 0;
else if ((brightness > 50) && (brightness <= 100))
gamma = 1;
else if ((brightness > 100) && (brightness <= 150))
gamma = 2;
else if ((brightness > 150) && (brightness <= 200))
gamma = 3;
else if ((brightness > 200) && (brightness <= 255))
gamma = 4;
ret = _ams369fg06_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);
return ret;
}
static int ams369fg06_ldi_init(struct ams369fg06 *lcd)
{
int ret, i;
static const unsigned short *init_seq[] = {
seq_setting,
seq_stand_by_off,
};
for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]);
if (ret)
break;
}
return ret;
}
static int ams369fg06_ldi_enable(struct ams369fg06 *lcd)
{
int ret, i;
static const unsigned short *init_seq[] = {
seq_stand_by_off,
seq_display_on,
};
for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]);
if (ret)
break;
}
return ret;
}
static int ams369fg06_ldi_disable(struct ams369fg06 *lcd)
{
int ret, i;
static const unsigned short *init_seq[] = {
seq_display_off,
seq_stand_by_on,
};
for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
ret = ams369fg06_panel_send_sequence(lcd, init_seq[i]);
if (ret)
break;
}
return ret;
}
static int ams369fg06_power_is_on(int power)
{
return power <= FB_BLANK_NORMAL;
}
static int ams369fg06_power_on(struct ams369fg06 *lcd)
{
int ret = 0;
struct lcd_platform_data *pd;
struct backlight_device *bd;
pd = lcd->lcd_pd;
bd = lcd->bd;
if (pd->power_on) {
pd->power_on(lcd->ld, 1);
msleep(pd->power_on_delay);
}
if (!pd->reset) {
dev_err(lcd->dev, "reset is NULL.\n");
return -EINVAL;
}
pd->reset(lcd->ld);
msleep(pd->reset_delay);
ret = ams369fg06_ldi_init(lcd);
if (ret) {
dev_err(lcd->dev, "failed to initialize ldi.\n");
return ret;
}
ret = ams369fg06_ldi_enable(lcd);
if (ret) {
dev_err(lcd->dev, "failed to enable ldi.\n");
return ret;
}
/* set brightness to current value after power on or resume. */
ret = ams369fg06_gamma_ctl(lcd, bd->props.brightness);
if (ret) {
dev_err(lcd->dev, "lcd gamma setting failed.\n");
return ret;
}
return 0;
}
static int ams369fg06_power_off(struct ams369fg06 *lcd)
{
int ret;
struct lcd_platform_data *pd;
pd = lcd->lcd_pd;
ret = ams369fg06_ldi_disable(lcd);
if (ret) {
dev_err(lcd->dev, "lcd setting failed.\n");
return -EIO;
}
msleep(pd->power_off_delay);
if (pd->power_on)
pd->power_on(lcd->ld, 0);
return 0;
}
static int ams369fg06_power(struct ams369fg06 *lcd, int power)
{
int ret = 0;
if (ams369fg06_power_is_on(power) &&
!ams369fg06_power_is_on(lcd->power))
ret = ams369fg06_power_on(lcd);
else if (!ams369fg06_power_is_on(power) &&
ams369fg06_power_is_on(lcd->power))
ret = ams369fg06_power_off(lcd);
if (!ret)
lcd->power = power;
return ret;
}
static int ams369fg06_get_power(struct lcd_device *ld)
{
struct ams369fg06 *lcd = lcd_get_data(ld);
return lcd->power;
}
static int ams369fg06_set_power(struct lcd_device *ld, int power)
{
struct ams369fg06 *lcd = lcd_get_data(ld);
if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
power != FB_BLANK_NORMAL) {
dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
return -EINVAL;
}
return ams369fg06_power(lcd, power);
}
static int ams369fg06_set_brightness(struct backlight_device *bd)
{
int ret = 0;
int brightness = bd->props.brightness;
struct ams369fg06 *lcd = bl_get_data(bd);
if (brightness < MIN_BRIGHTNESS ||
brightness > bd->props.max_brightness) {
dev_err(&bd->dev, "lcd brightness should be %d to %d.\n",
MIN_BRIGHTNESS, MAX_BRIGHTNESS);
return -EINVAL;
}
ret = ams369fg06_gamma_ctl(lcd, bd->props.brightness);
if (ret) {
dev_err(&bd->dev, "lcd brightness setting failed.\n");
return -EIO;
}
return ret;
}
static struct lcd_ops ams369fg06_lcd_ops = {
.get_power = ams369fg06_get_power,
.set_power = ams369fg06_set_power,
};
static const struct backlight_ops ams369fg06_backlight_ops = {
.update_status = ams369fg06_set_brightness,
};
static int ams369fg06_probe(struct spi_device *spi)
{
int ret = 0;
struct ams369fg06 *lcd = NULL;
struct lcd_device *ld = NULL;
struct backlight_device *bd = NULL;
struct backlight_properties props;
lcd = devm_kzalloc(&spi->dev, sizeof(struct ams369fg06), GFP_KERNEL);
if (!lcd)
return -ENOMEM;
/* ams369fg06 lcd panel uses 3-wire 16bits SPI Mode. */
spi->bits_per_word = 16;
ret = spi_setup(spi);
if (ret < 0) {
dev_err(&spi->dev, "spi setup failed.\n");
return ret;
}
lcd->spi = spi;
lcd->dev = &spi->dev;
lcd->lcd_pd = dev_get_platdata(&spi->dev);
if (!lcd->lcd_pd) {
dev_err(&spi->dev, "platform data is NULL\n");
return -EINVAL;
}
ld = devm_lcd_device_register(&spi->dev, "ams369fg06", &spi->dev, lcd,
&ams369fg06_lcd_ops);
if (IS_ERR(ld))
return PTR_ERR(ld);
lcd->ld = ld;
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = MAX_BRIGHTNESS;
bd = devm_backlight_device_register(&spi->dev, "ams369fg06-bl",
&spi->dev, lcd,
&ams369fg06_backlight_ops, &props);
if (IS_ERR(bd))
return PTR_ERR(bd);
bd->props.brightness = DEFAULT_BRIGHTNESS;
lcd->bd = bd;
if (!lcd->lcd_pd->lcd_enabled) {
/*
* if lcd panel was off from bootloader then
* current lcd status is powerdown and then
* it enables lcd panel.
*/
lcd->power = FB_BLANK_POWERDOWN;
ams369fg06_power(lcd, FB_BLANK_UNBLANK);
} else {
lcd->power = FB_BLANK_UNBLANK;
}
spi_set_drvdata(spi, lcd);
dev_info(&spi->dev, "ams369fg06 panel driver has been probed.\n");
return 0;
}
static void ams369fg06_remove(struct spi_device *spi)
{
struct ams369fg06 *lcd = spi_get_drvdata(spi);
ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
}
#ifdef CONFIG_PM_SLEEP
static int ams369fg06_suspend(struct device *dev)
{
struct ams369fg06 *lcd = dev_get_drvdata(dev);
dev_dbg(dev, "lcd->power = %d\n", lcd->power);
/*
* when lcd panel is suspend, lcd panel becomes off
* regardless of status.
*/
return ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
}
static int ams369fg06_resume(struct device *dev)
{
struct ams369fg06 *lcd = dev_get_drvdata(dev);
lcd->power = FB_BLANK_POWERDOWN;
return ams369fg06_power(lcd, FB_BLANK_UNBLANK);
}
#endif
static SIMPLE_DEV_PM_OPS(ams369fg06_pm_ops, ams369fg06_suspend,
ams369fg06_resume);
static void ams369fg06_shutdown(struct spi_device *spi)
{
struct ams369fg06 *lcd = spi_get_drvdata(spi);
ams369fg06_power(lcd, FB_BLANK_POWERDOWN);
}
static struct spi_driver ams369fg06_driver = {
.driver = {
.name = "ams369fg06",
.pm = &ams369fg06_pm_ops,
},
.probe = ams369fg06_probe,
.remove = ams369fg06_remove,
.shutdown = ams369fg06_shutdown,
};
module_spi_driver(ams369fg06_driver);
MODULE_AUTHOR("Jingoo Han <[email protected]>");
MODULE_DESCRIPTION("ams369fg06 LCD Driver");
MODULE_LICENSE("GPL");
| linux-master | drivers/video/backlight/ams369fg06.c |
// SPDX-License-Identifier: GPL-2.0-only
/* drivers/video/backlight/vgg2432a4.c
*
* VGG2432A4 (ILI9320) LCD controller driver.
*
* Copyright 2007 Simtec Electronics
* http://armlinux.simtec.co.uk/
* Ben Dooks <[email protected]>
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/lcd.h>
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <video/ili9320.h>
#include "ili9320.h"
/* Device initialisation sequences */
static const struct ili9320_reg vgg_init1[] = {
{
.address = ILI9320_POWER1,
.value = ILI9320_POWER1_AP(0) | ILI9320_POWER1_BT(0),
}, {
.address = ILI9320_POWER2,
.value = (ILI9320_POWER2_VC(7) |
ILI9320_POWER2_DC0(0) | ILI9320_POWER2_DC1(0)),
}, {
.address = ILI9320_POWER3,
.value = ILI9320_POWER3_VRH(0),
}, {
.address = ILI9320_POWER4,
.value = ILI9320_POWER4_VREOUT(0),
},
};
static const struct ili9320_reg vgg_init2[] = {
{
.address = ILI9320_POWER1,
.value = (ILI9320_POWER1_AP(3) | ILI9320_POWER1_APE |
ILI9320_POWER1_BT(7) | ILI9320_POWER1_SAP),
}, {
.address = ILI9320_POWER2,
.value = ILI9320_POWER2_VC(7) | ILI9320_POWER2_DC0(3),
}
};
static const struct ili9320_reg vgg_gamma[] = {
{
.address = ILI9320_GAMMA1,
.value = 0x0000,
}, {
.address = ILI9320_GAMMA2,
.value = 0x0505,
}, {
.address = ILI9320_GAMMA3,
.value = 0x0004,
}, {
.address = ILI9320_GAMMA4,
.value = 0x0006,
}, {
.address = ILI9320_GAMMA5,
.value = 0x0707,
}, {
.address = ILI9320_GAMMA6,
.value = 0x0105,
}, {
.address = ILI9320_GAMMA7,
.value = 0x0002,
}, {
.address = ILI9320_GAMMA8,
.value = 0x0707,
}, {
.address = ILI9320_GAMMA9,
.value = 0x0704,
}, {
.address = ILI9320_GAMMA10,
.value = 0x807,
}
};
static const struct ili9320_reg vgg_init0[] = {
[0] = {
/* set direction and scan mode gate */
.address = ILI9320_DRIVER,
.value = ILI9320_DRIVER_SS,
}, {
.address = ILI9320_DRIVEWAVE,
.value = (ILI9320_DRIVEWAVE_MUSTSET |
ILI9320_DRIVEWAVE_EOR | ILI9320_DRIVEWAVE_BC),
}, {
.address = ILI9320_ENTRYMODE,
.value = ILI9320_ENTRYMODE_ID(3) | ILI9320_ENTRYMODE_BGR,
}, {
.address = ILI9320_RESIZING,
.value = 0x0,
},
};
static int vgg2432a4_lcd_init(struct ili9320 *lcd,
struct ili9320_platdata *cfg)
{
unsigned int addr;
int ret;
/* Set VCore before anything else (VGG243237-6UFLWA) */
ret = ili9320_write(lcd, 0x00e5, 0x8000);
if (ret)
goto err_initial;
/* Start the oscillator up before we can do anything else. */
ret = ili9320_write(lcd, ILI9320_OSCILATION, ILI9320_OSCILATION_OSC);
if (ret)
goto err_initial;
/* must wait at-lesat 10ms after starting */
mdelay(15);
ret = ili9320_write_regs(lcd, vgg_init0, ARRAY_SIZE(vgg_init0));
if (ret != 0)
goto err_initial;
ili9320_write(lcd, ILI9320_DISPLAY2, cfg->display2);
ili9320_write(lcd, ILI9320_DISPLAY3, cfg->display3);
ili9320_write(lcd, ILI9320_DISPLAY4, cfg->display4);
ili9320_write(lcd, ILI9320_RGB_IF1, cfg->rgb_if1);
ili9320_write(lcd, ILI9320_FRAMEMAKER, 0x0);
ili9320_write(lcd, ILI9320_RGB_IF2, cfg->rgb_if2);
ret = ili9320_write_regs(lcd, vgg_init1, ARRAY_SIZE(vgg_init1));
if (ret != 0)
goto err_vgg;
mdelay(300);
ret = ili9320_write_regs(lcd, vgg_init2, ARRAY_SIZE(vgg_init2));
if (ret != 0)
goto err_vgg2;
mdelay(100);
ili9320_write(lcd, ILI9320_POWER3, 0x13c);
mdelay(100);
ili9320_write(lcd, ILI9320_POWER4, 0x1c00);
ili9320_write(lcd, ILI9320_POWER7, 0x000e);
mdelay(100);
ili9320_write(lcd, ILI9320_GRAM_HORIZ_ADDR, 0x00);
ili9320_write(lcd, ILI9320_GRAM_VERT_ADD, 0x00);
ret = ili9320_write_regs(lcd, vgg_gamma, ARRAY_SIZE(vgg_gamma));
if (ret != 0)
goto err_vgg3;
ili9320_write(lcd, ILI9320_HORIZ_START, 0x0);
ili9320_write(lcd, ILI9320_HORIZ_END, cfg->hsize - 1);
ili9320_write(lcd, ILI9320_VERT_START, 0x0);
ili9320_write(lcd, ILI9320_VERT_END, cfg->vsize - 1);
ili9320_write(lcd, ILI9320_DRIVER2,
ILI9320_DRIVER2_NL(((cfg->vsize - 240) / 8) + 0x1D));
ili9320_write(lcd, ILI9320_BASE_IMAGE, 0x1);
ili9320_write(lcd, ILI9320_VERT_SCROLL, 0x00);
for (addr = ILI9320_PARTIAL1_POSITION; addr <= ILI9320_PARTIAL2_END;
addr++) {
ili9320_write(lcd, addr, 0x0);
}
ili9320_write(lcd, ILI9320_INTERFACE1, 0x10);
ili9320_write(lcd, ILI9320_INTERFACE2, cfg->interface2);
ili9320_write(lcd, ILI9320_INTERFACE3, cfg->interface3);
ili9320_write(lcd, ILI9320_INTERFACE4, cfg->interface4);
ili9320_write(lcd, ILI9320_INTERFACE5, cfg->interface5);
ili9320_write(lcd, ILI9320_INTERFACE6, cfg->interface6);
lcd->display1 = (ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_DTE |
ILI9320_DISPLAY1_GON | ILI9320_DISPLAY1_BASEE |
0x40);
ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
return 0;
err_vgg3:
err_vgg2:
err_vgg:
err_initial:
return ret;
}
#ifdef CONFIG_PM_SLEEP
static int vgg2432a4_suspend(struct device *dev)
{
return ili9320_suspend(dev_get_drvdata(dev));
}
static int vgg2432a4_resume(struct device *dev)
{
return ili9320_resume(dev_get_drvdata(dev));
}
#endif
static struct ili9320_client vgg2432a4_client = {
.name = "VGG2432A4",
.init = vgg2432a4_lcd_init,
};
/* Device probe */
static int vgg2432a4_probe(struct spi_device *spi)
{
int ret;
ret = ili9320_probe_spi(spi, &vgg2432a4_client);
if (ret != 0) {
dev_err(&spi->dev, "failed to initialise ili9320\n");
return ret;
}
return 0;
}
static void vgg2432a4_remove(struct spi_device *spi)
{
ili9320_remove(spi_get_drvdata(spi));
}
static void vgg2432a4_shutdown(struct spi_device *spi)
{
ili9320_shutdown(spi_get_drvdata(spi));
}
static SIMPLE_DEV_PM_OPS(vgg2432a4_pm_ops, vgg2432a4_suspend, vgg2432a4_resume);
static struct spi_driver vgg2432a4_driver = {
.driver = {
.name = "VGG2432A4",
.pm = &vgg2432a4_pm_ops,
},
.probe = vgg2432a4_probe,
.remove = vgg2432a4_remove,
.shutdown = vgg2432a4_shutdown,
};
module_spi_driver(vgg2432a4_driver);
MODULE_AUTHOR("Ben Dooks <[email protected]>");
MODULE_DESCRIPTION("VGG2432A4 LCD Driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("spi:VGG2432A4");
| linux-master | drivers/video/backlight/vgg2432a4.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* lm3533-bl.c -- LM3533 Backlight driver
*
* Copyright (C) 2011-2012 Texas Instruments
*
* Author: Johan Hovold <[email protected]>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/backlight.h>
#include <linux/fb.h>
#include <linux/slab.h>
#include <linux/mfd/lm3533.h>
#define LM3533_HVCTRLBANK_COUNT 2
#define LM3533_BL_MAX_BRIGHTNESS 255
#define LM3533_REG_CTRLBANK_AB_BCONF 0x1a
struct lm3533_bl {
struct lm3533 *lm3533;
struct lm3533_ctrlbank cb;
struct backlight_device *bd;
int id;
};
static inline int lm3533_bl_get_ctrlbank_id(struct lm3533_bl *bl)
{
return bl->id;
}
static int lm3533_bl_update_status(struct backlight_device *bd)
{
struct lm3533_bl *bl = bl_get_data(bd);
return lm3533_ctrlbank_set_brightness(&bl->cb, backlight_get_brightness(bd));
}
static int lm3533_bl_get_brightness(struct backlight_device *bd)
{
struct lm3533_bl *bl = bl_get_data(bd);
u8 val;
int ret;
ret = lm3533_ctrlbank_get_brightness(&bl->cb, &val);
if (ret)
return ret;
return val;
}
static const struct backlight_ops lm3533_bl_ops = {
.get_brightness = lm3533_bl_get_brightness,
.update_status = lm3533_bl_update_status,
};
static ssize_t show_id(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm3533_bl *bl = dev_get_drvdata(dev);
return scnprintf(buf, PAGE_SIZE, "%d\n", bl->id);
}
static ssize_t show_als_channel(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm3533_bl *bl = dev_get_drvdata(dev);
unsigned channel = lm3533_bl_get_ctrlbank_id(bl);
return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
}
static ssize_t show_als_en(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm3533_bl *bl = dev_get_drvdata(dev);
int ctrlbank = lm3533_bl_get_ctrlbank_id(bl);
u8 val;
u8 mask;
bool enable;
int ret;
ret = lm3533_read(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, &val);
if (ret)
return ret;
mask = 1 << (2 * ctrlbank);
enable = val & mask;
return scnprintf(buf, PAGE_SIZE, "%d\n", enable);
}
static ssize_t store_als_en(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct lm3533_bl *bl = dev_get_drvdata(dev);
int ctrlbank = lm3533_bl_get_ctrlbank_id(bl);
int enable;
u8 val;
u8 mask;
int ret;
if (kstrtoint(buf, 0, &enable))
return -EINVAL;
mask = 1 << (2 * ctrlbank);
if (enable)
val = mask;
else
val = 0;
ret = lm3533_update(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, val,
mask);
if (ret)
return ret;
return len;
}
static ssize_t show_linear(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm3533_bl *bl = dev_get_drvdata(dev);
u8 val;
u8 mask;
int linear;
int ret;
ret = lm3533_read(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, &val);
if (ret)
return ret;
mask = 1 << (2 * lm3533_bl_get_ctrlbank_id(bl) + 1);
if (val & mask)
linear = 1;
else
linear = 0;
return scnprintf(buf, PAGE_SIZE, "%x\n", linear);
}
static ssize_t store_linear(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct lm3533_bl *bl = dev_get_drvdata(dev);
unsigned long linear;
u8 mask;
u8 val;
int ret;
if (kstrtoul(buf, 0, &linear))
return -EINVAL;
mask = 1 << (2 * lm3533_bl_get_ctrlbank_id(bl) + 1);
if (linear)
val = mask;
else
val = 0;
ret = lm3533_update(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, val,
mask);
if (ret)
return ret;
return len;
}
static ssize_t show_pwm(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct lm3533_bl *bl = dev_get_drvdata(dev);
u8 val;
int ret;
ret = lm3533_ctrlbank_get_pwm(&bl->cb, &val);
if (ret)
return ret;
return scnprintf(buf, PAGE_SIZE, "%u\n", val);
}
static ssize_t store_pwm(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct lm3533_bl *bl = dev_get_drvdata(dev);
u8 val;
int ret;
if (kstrtou8(buf, 0, &val))
return -EINVAL;
ret = lm3533_ctrlbank_set_pwm(&bl->cb, val);
if (ret)
return ret;
return len;
}
static LM3533_ATTR_RO(als_channel);
static LM3533_ATTR_RW(als_en);
static LM3533_ATTR_RO(id);
static LM3533_ATTR_RW(linear);
static LM3533_ATTR_RW(pwm);
static struct attribute *lm3533_bl_attributes[] = {
&dev_attr_als_channel.attr,
&dev_attr_als_en.attr,
&dev_attr_id.attr,
&dev_attr_linear.attr,
&dev_attr_pwm.attr,
NULL,
};
static umode_t lm3533_bl_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
struct device *dev = kobj_to_dev(kobj);
struct lm3533_bl *bl = dev_get_drvdata(dev);
umode_t mode = attr->mode;
if (attr == &dev_attr_als_channel.attr ||
attr == &dev_attr_als_en.attr) {
if (!bl->lm3533->have_als)
mode = 0;
}
return mode;
};
static struct attribute_group lm3533_bl_attribute_group = {
.is_visible = lm3533_bl_attr_is_visible,
.attrs = lm3533_bl_attributes
};
static int lm3533_bl_setup(struct lm3533_bl *bl,
struct lm3533_bl_platform_data *pdata)
{
int ret;
ret = lm3533_ctrlbank_set_max_current(&bl->cb, pdata->max_current);
if (ret)
return ret;
return lm3533_ctrlbank_set_pwm(&bl->cb, pdata->pwm);
}
static int lm3533_bl_probe(struct platform_device *pdev)
{
struct lm3533 *lm3533;
struct lm3533_bl_platform_data *pdata;
struct lm3533_bl *bl;
struct backlight_device *bd;
struct backlight_properties props;
int ret;
dev_dbg(&pdev->dev, "%s\n", __func__);
lm3533 = dev_get_drvdata(pdev->dev.parent);
if (!lm3533)
return -EINVAL;
pdata = dev_get_platdata(&pdev->dev);
if (!pdata) {
dev_err(&pdev->dev, "no platform data\n");
return -EINVAL;
}
if (pdev->id < 0 || pdev->id >= LM3533_HVCTRLBANK_COUNT) {
dev_err(&pdev->dev, "illegal backlight id %d\n", pdev->id);
return -EINVAL;
}
bl = devm_kzalloc(&pdev->dev, sizeof(*bl), GFP_KERNEL);
if (!bl)
return -ENOMEM;
bl->lm3533 = lm3533;
bl->id = pdev->id;
bl->cb.lm3533 = lm3533;
bl->cb.id = lm3533_bl_get_ctrlbank_id(bl);
bl->cb.dev = NULL; /* until registered */
memset(&props, 0, sizeof(props));
props.type = BACKLIGHT_RAW;
props.max_brightness = LM3533_BL_MAX_BRIGHTNESS;
props.brightness = pdata->default_brightness;
bd = devm_backlight_device_register(&pdev->dev, pdata->name,
pdev->dev.parent, bl, &lm3533_bl_ops,
&props);
if (IS_ERR(bd)) {
dev_err(&pdev->dev, "failed to register backlight device\n");
return PTR_ERR(bd);
}
bl->bd = bd;
bl->cb.dev = &bl->bd->dev;
platform_set_drvdata(pdev, bl);
ret = sysfs_create_group(&bd->dev.kobj, &lm3533_bl_attribute_group);
if (ret < 0) {
dev_err(&pdev->dev, "failed to create sysfs attributes\n");
return ret;
}
backlight_update_status(bd);
ret = lm3533_bl_setup(bl, pdata);
if (ret)
goto err_sysfs_remove;
ret = lm3533_ctrlbank_enable(&bl->cb);
if (ret)
goto err_sysfs_remove;
return 0;
err_sysfs_remove:
sysfs_remove_group(&bd->dev.kobj, &lm3533_bl_attribute_group);
return ret;
}
static void lm3533_bl_remove(struct platform_device *pdev)
{
struct lm3533_bl *bl = platform_get_drvdata(pdev);
struct backlight_device *bd = bl->bd;
dev_dbg(&bd->dev, "%s\n", __func__);
bd->props.power = FB_BLANK_POWERDOWN;
bd->props.brightness = 0;
lm3533_ctrlbank_disable(&bl->cb);
sysfs_remove_group(&bd->dev.kobj, &lm3533_bl_attribute_group);
}
#ifdef CONFIG_PM_SLEEP
static int lm3533_bl_suspend(struct device *dev)
{
struct lm3533_bl *bl = dev_get_drvdata(dev);
dev_dbg(dev, "%s\n", __func__);
return lm3533_ctrlbank_disable(&bl->cb);
}
static int lm3533_bl_resume(struct device *dev)
{
struct lm3533_bl *bl = dev_get_drvdata(dev);
dev_dbg(dev, "%s\n", __func__);
return lm3533_ctrlbank_enable(&bl->cb);
}
#endif
static SIMPLE_DEV_PM_OPS(lm3533_bl_pm_ops, lm3533_bl_suspend, lm3533_bl_resume);
static void lm3533_bl_shutdown(struct platform_device *pdev)
{
struct lm3533_bl *bl = platform_get_drvdata(pdev);
dev_dbg(&pdev->dev, "%s\n", __func__);
lm3533_ctrlbank_disable(&bl->cb);
}
static struct platform_driver lm3533_bl_driver = {
.driver = {
.name = "lm3533-backlight",
.pm = &lm3533_bl_pm_ops,
},
.probe = lm3533_bl_probe,
.remove_new = lm3533_bl_remove,
.shutdown = lm3533_bl_shutdown,
};
module_platform_driver(lm3533_bl_driver);
MODULE_AUTHOR("Johan Hovold <[email protected]>");
MODULE_DESCRIPTION("LM3533 Backlight driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:lm3533-backlight");
| linux-master | drivers/video/backlight/lm3533_bl.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* l4f00242t03.c -- support for Epson L4F00242T03 LCD
*
* Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved.
*
* Copyright (c) 2009 Alberto Panizzo <[email protected]>
* Inspired by Marek Vasut work in l4f00242t03.c
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/gpio/consumer.h>
#include <linux/lcd.h>
#include <linux/slab.h>
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>
struct l4f00242t03_priv {
struct spi_device *spi;
struct lcd_device *ld;
int lcd_state;
struct regulator *io_reg;
struct regulator *core_reg;
struct gpio_desc *reset;
struct gpio_desc *enable;
};
static void l4f00242t03_reset(struct gpio_desc *gpiod)
{
pr_debug("l4f00242t03_reset.\n");
gpiod_set_value(gpiod, 1);
mdelay(100);
gpiod_set_value(gpiod, 0);
mdelay(10); /* tRES >= 100us */
gpiod_set_value(gpiod, 1);
mdelay(20);
}
#define param(x) ((x) | 0x100)
static void l4f00242t03_lcd_init(struct spi_device *spi)
{
struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
const u16 cmd[] = { 0x36, param(0), 0x3A, param(0x60) };
int ret;
dev_dbg(&spi->dev, "initializing LCD\n");
ret = regulator_set_voltage(priv->io_reg, 1800000, 1800000);
if (ret) {
dev_err(&spi->dev, "failed to set the IO regulator voltage.\n");
return;
}
ret = regulator_enable(priv->io_reg);
if (ret) {
dev_err(&spi->dev, "failed to enable the IO regulator.\n");
return;
}
ret = regulator_set_voltage(priv->core_reg, 2800000, 2800000);
if (ret) {
dev_err(&spi->dev, "failed to set the core regulator voltage.\n");
regulator_disable(priv->io_reg);
return;
}
ret = regulator_enable(priv->core_reg);
if (ret) {
dev_err(&spi->dev, "failed to enable the core regulator.\n");
regulator_disable(priv->io_reg);
return;
}
l4f00242t03_reset(priv->reset);
gpiod_set_value(priv->enable, 1);
msleep(60);
spi_write(spi, (const u8 *)cmd, ARRAY_SIZE(cmd) * sizeof(u16));
}
static void l4f00242t03_lcd_powerdown(struct spi_device *spi)
{
struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
dev_dbg(&spi->dev, "Powering down LCD\n");
gpiod_set_value(priv->enable, 0);
regulator_disable(priv->io_reg);
regulator_disable(priv->core_reg);
}
static int l4f00242t03_lcd_power_get(struct lcd_device *ld)
{
struct l4f00242t03_priv *priv = lcd_get_data(ld);
return priv->lcd_state;
}
static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power)
{
struct l4f00242t03_priv *priv = lcd_get_data(ld);
struct spi_device *spi = priv->spi;
const u16 slpout = 0x11;
const u16 dison = 0x29;
const u16 slpin = 0x10;
const u16 disoff = 0x28;
if (power <= FB_BLANK_NORMAL) {
if (priv->lcd_state <= FB_BLANK_NORMAL) {
/* Do nothing, the LCD is running */
} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
dev_dbg(&spi->dev, "Resuming LCD\n");
spi_write(spi, (const u8 *)&slpout, sizeof(u16));
msleep(60);
spi_write(spi, (const u8 *)&dison, sizeof(u16));
} else {
/* priv->lcd_state == FB_BLANK_POWERDOWN */
l4f00242t03_lcd_init(spi);
priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
l4f00242t03_lcd_power_set(priv->ld, power);
}
} else if (power < FB_BLANK_POWERDOWN) {
if (priv->lcd_state <= FB_BLANK_NORMAL) {
/* Send the display in standby */
dev_dbg(&spi->dev, "Standby the LCD\n");
spi_write(spi, (const u8 *)&disoff, sizeof(u16));
msleep(60);
spi_write(spi, (const u8 *)&slpin, sizeof(u16));
} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
/* Do nothing, the LCD is already in standby */
} else {
/* priv->lcd_state == FB_BLANK_POWERDOWN */
l4f00242t03_lcd_init(spi);
priv->lcd_state = FB_BLANK_UNBLANK;
l4f00242t03_lcd_power_set(ld, power);
}
} else {
/* power == FB_BLANK_POWERDOWN */
if (priv->lcd_state != FB_BLANK_POWERDOWN) {
/* Clear the screen before shutting down */
spi_write(spi, (const u8 *)&disoff, sizeof(u16));
msleep(60);
l4f00242t03_lcd_powerdown(spi);
}
}
priv->lcd_state = power;
return 0;
}
static struct lcd_ops l4f_ops = {
.set_power = l4f00242t03_lcd_power_set,
.get_power = l4f00242t03_lcd_power_get,
};
static int l4f00242t03_probe(struct spi_device *spi)
{
struct l4f00242t03_priv *priv;
priv = devm_kzalloc(&spi->dev, sizeof(struct l4f00242t03_priv),
GFP_KERNEL);
if (priv == NULL)
return -ENOMEM;
spi_set_drvdata(spi, priv);
spi->bits_per_word = 9;
spi_setup(spi);
priv->spi = spi;
priv->reset = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(priv->reset)) {
dev_err(&spi->dev,
"Unable to get the lcd l4f00242t03 reset gpio.\n");
return PTR_ERR(priv->reset);
}
gpiod_set_consumer_name(priv->reset, "lcd l4f00242t03 reset");
priv->enable = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(priv->enable)) {
dev_err(&spi->dev,
"Unable to get the lcd l4f00242t03 data en gpio.\n");
return PTR_ERR(priv->enable);
}
gpiod_set_consumer_name(priv->enable, "lcd l4f00242t03 data enable");
priv->io_reg = devm_regulator_get(&spi->dev, "vdd");
if (IS_ERR(priv->io_reg)) {
dev_err(&spi->dev, "%s: Unable to get the IO regulator\n",
__func__);
return PTR_ERR(priv->io_reg);
}
priv->core_reg = devm_regulator_get(&spi->dev, "vcore");
if (IS_ERR(priv->core_reg)) {
dev_err(&spi->dev, "%s: Unable to get the core regulator\n",
__func__);
return PTR_ERR(priv->core_reg);
}
priv->ld = devm_lcd_device_register(&spi->dev, "l4f00242t03", &spi->dev,
priv, &l4f_ops);
if (IS_ERR(priv->ld))
return PTR_ERR(priv->ld);
/* Init the LCD */
l4f00242t03_lcd_init(spi);
priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_UNBLANK);
dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n");
return 0;
}
static void l4f00242t03_remove(struct spi_device *spi)
{
struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
}
static void l4f00242t03_shutdown(struct spi_device *spi)
{
struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
if (priv)
l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
}
static struct spi_driver l4f00242t03_driver = {
.driver = {
.name = "l4f00242t03",
},
.probe = l4f00242t03_probe,
.remove = l4f00242t03_remove,
.shutdown = l4f00242t03_shutdown,
};
module_spi_driver(l4f00242t03_driver);
MODULE_AUTHOR("Alberto Panizzo <[email protected]>");
MODULE_DESCRIPTION("EPSON L4F00242T03 LCD");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/video/backlight/l4f00242t03.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* TI LP8788 MFD - backlight driver
*
* Copyright 2012 Texas Instruments
*
* Author: Milo(Woogyom) Kim <[email protected]>
*/
#include <linux/backlight.h>
#include <linux/err.h>
#include <linux/mfd/lp8788.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/slab.h>
/* Register address */
#define LP8788_BL_CONFIG 0x96
#define LP8788_BL_EN BIT(0)
#define LP8788_BL_PWM_INPUT_EN BIT(5)
#define LP8788_BL_FULLSCALE_SHIFT 2
#define LP8788_BL_DIM_MODE_SHIFT 1
#define LP8788_BL_PWM_POLARITY_SHIFT 6
#define LP8788_BL_BRIGHTNESS 0x97
#define LP8788_BL_RAMP 0x98
#define LP8788_BL_RAMP_RISE_SHIFT 4
#define MAX_BRIGHTNESS 127
#define DEFAULT_BL_NAME "lcd-backlight"
struct lp8788_bl_config {
enum lp8788_bl_ctrl_mode bl_mode;
enum lp8788_bl_dim_mode dim_mode;
enum lp8788_bl_full_scale_current full_scale;
enum lp8788_bl_ramp_step rise_time;
enum lp8788_bl_ramp_step fall_time;
enum pwm_polarity pwm_pol;
};
struct lp8788_bl {
struct lp8788 *lp;
struct backlight_device *bl_dev;
struct lp8788_backlight_platform_data *pdata;
enum lp8788_bl_ctrl_mode mode;
struct pwm_device *pwm;
};
static struct lp8788_bl_config default_bl_config = {
.bl_mode = LP8788_BL_REGISTER_ONLY,
.dim_mode = LP8788_DIM_EXPONENTIAL,
.full_scale = LP8788_FULLSCALE_1900uA,
.rise_time = LP8788_RAMP_8192us,
.fall_time = LP8788_RAMP_8192us,
.pwm_pol = PWM_POLARITY_NORMAL,
};
static inline bool is_brightness_ctrl_by_pwm(enum lp8788_bl_ctrl_mode mode)
{
return mode == LP8788_BL_COMB_PWM_BASED;
}
static inline bool is_brightness_ctrl_by_register(enum lp8788_bl_ctrl_mode mode)
{
return mode == LP8788_BL_REGISTER_ONLY ||
mode == LP8788_BL_COMB_REGISTER_BASED;
}
static int lp8788_backlight_configure(struct lp8788_bl *bl)
{
struct lp8788_backlight_platform_data *pdata = bl->pdata;
struct lp8788_bl_config *cfg = &default_bl_config;
int ret;
u8 val;
/*
* Update chip configuration if platform data exists,
* otherwise use the default settings.
*/
if (pdata) {
cfg->bl_mode = pdata->bl_mode;
cfg->dim_mode = pdata->dim_mode;
cfg->full_scale = pdata->full_scale;
cfg->rise_time = pdata->rise_time;
cfg->fall_time = pdata->fall_time;
cfg->pwm_pol = pdata->pwm_pol;
}
/* Brightness ramp up/down */
val = (cfg->rise_time << LP8788_BL_RAMP_RISE_SHIFT) | cfg->fall_time;
ret = lp8788_write_byte(bl->lp, LP8788_BL_RAMP, val);
if (ret)
return ret;
/* Fullscale current setting */
val = (cfg->full_scale << LP8788_BL_FULLSCALE_SHIFT) |
(cfg->dim_mode << LP8788_BL_DIM_MODE_SHIFT);
/* Brightness control mode */
switch (cfg->bl_mode) {
case LP8788_BL_REGISTER_ONLY:
val |= LP8788_BL_EN;
break;
case LP8788_BL_COMB_PWM_BASED:
case LP8788_BL_COMB_REGISTER_BASED:
val |= LP8788_BL_EN | LP8788_BL_PWM_INPUT_EN |
(cfg->pwm_pol << LP8788_BL_PWM_POLARITY_SHIFT);
break;
default:
dev_err(bl->lp->dev, "invalid mode: %d\n", cfg->bl_mode);
return -EINVAL;
}
bl->mode = cfg->bl_mode;
return lp8788_write_byte(bl->lp, LP8788_BL_CONFIG, val);
}
static void lp8788_pwm_ctrl(struct lp8788_bl *bl, int br, int max_br)
{
unsigned int period;
unsigned int duty;
struct device *dev;
struct pwm_device *pwm;
if (!bl->pdata)
return;
period = bl->pdata->period_ns;
duty = br * period / max_br;
dev = bl->lp->dev;
/* request PWM device with the consumer name */
if (!bl->pwm) {
pwm = devm_pwm_get(dev, LP8788_DEV_BACKLIGHT);
if (IS_ERR(pwm)) {
dev_err(dev, "can not get PWM device\n");
return;
}
bl->pwm = pwm;
/*
* FIXME: pwm_apply_args() should be removed when switching to
* the atomic PWM API.
*/
pwm_apply_args(pwm);
}
pwm_config(bl->pwm, duty, period);
if (duty)
pwm_enable(bl->pwm);
else
pwm_disable(bl->pwm);
}
static int lp8788_bl_update_status(struct backlight_device *bl_dev)
{
struct lp8788_bl *bl = bl_get_data(bl_dev);
enum lp8788_bl_ctrl_mode mode = bl->mode;
if (bl_dev->props.state & BL_CORE_SUSPENDED)
bl_dev->props.brightness = 0;
if (is_brightness_ctrl_by_pwm(mode)) {
int brt = bl_dev->props.brightness;
int max = bl_dev->props.max_brightness;
lp8788_pwm_ctrl(bl, brt, max);
} else if (is_brightness_ctrl_by_register(mode)) {
u8 brt = bl_dev->props.brightness;
lp8788_write_byte(bl->lp, LP8788_BL_BRIGHTNESS, brt);
}
return 0;
}
static const struct backlight_ops lp8788_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = lp8788_bl_update_status,
};
static int lp8788_backlight_register(struct lp8788_bl *bl)
{
struct backlight_device *bl_dev;
struct backlight_properties props;
struct lp8788_backlight_platform_data *pdata = bl->pdata;
int init_brt;
char *name;
props.type = BACKLIGHT_PLATFORM;
props.max_brightness = MAX_BRIGHTNESS;
/* Initial brightness */
if (pdata)
init_brt = min_t(int, pdata->initial_brightness,
props.max_brightness);
else
init_brt = 0;
props.brightness = init_brt;
/* Backlight device name */
if (!pdata || !pdata->name)
name = DEFAULT_BL_NAME;
else
name = pdata->name;
bl_dev = backlight_device_register(name, bl->lp->dev, bl,
&lp8788_bl_ops, &props);
if (IS_ERR(bl_dev))
return PTR_ERR(bl_dev);
bl->bl_dev = bl_dev;
return 0;
}
static void lp8788_backlight_unregister(struct lp8788_bl *bl)
{
struct backlight_device *bl_dev = bl->bl_dev;
backlight_device_unregister(bl_dev);
}
static ssize_t lp8788_get_bl_ctl_mode(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lp8788_bl *bl = dev_get_drvdata(dev);
enum lp8788_bl_ctrl_mode mode = bl->mode;
char *strmode;
if (is_brightness_ctrl_by_pwm(mode))
strmode = "PWM based";
else if (is_brightness_ctrl_by_register(mode))
strmode = "Register based";
else
strmode = "Invalid mode";
return scnprintf(buf, PAGE_SIZE, "%s\n", strmode);
}
static DEVICE_ATTR(bl_ctl_mode, S_IRUGO, lp8788_get_bl_ctl_mode, NULL);
static struct attribute *lp8788_attributes[] = {
&dev_attr_bl_ctl_mode.attr,
NULL,
};
static const struct attribute_group lp8788_attr_group = {
.attrs = lp8788_attributes,
};
static int lp8788_backlight_probe(struct platform_device *pdev)
{
struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
struct lp8788_bl *bl;
int ret;
bl = devm_kzalloc(lp->dev, sizeof(struct lp8788_bl), GFP_KERNEL);
if (!bl)
return -ENOMEM;
bl->lp = lp;
if (lp->pdata)
bl->pdata = lp->pdata->bl_pdata;
platform_set_drvdata(pdev, bl);
ret = lp8788_backlight_configure(bl);
if (ret) {
dev_err(lp->dev, "backlight config err: %d\n", ret);
goto err_dev;
}
ret = lp8788_backlight_register(bl);
if (ret) {
dev_err(lp->dev, "register backlight err: %d\n", ret);
goto err_dev;
}
ret = sysfs_create_group(&pdev->dev.kobj, &lp8788_attr_group);
if (ret) {
dev_err(lp->dev, "register sysfs err: %d\n", ret);
goto err_sysfs;
}
backlight_update_status(bl->bl_dev);
return 0;
err_sysfs:
lp8788_backlight_unregister(bl);
err_dev:
return ret;
}
static void lp8788_backlight_remove(struct platform_device *pdev)
{
struct lp8788_bl *bl = platform_get_drvdata(pdev);
struct backlight_device *bl_dev = bl->bl_dev;
bl_dev->props.brightness = 0;
backlight_update_status(bl_dev);
sysfs_remove_group(&pdev->dev.kobj, &lp8788_attr_group);
lp8788_backlight_unregister(bl);
}
static struct platform_driver lp8788_bl_driver = {
.probe = lp8788_backlight_probe,
.remove_new = lp8788_backlight_remove,
.driver = {
.name = LP8788_DEV_BACKLIGHT,
},
};
module_platform_driver(lp8788_bl_driver);
MODULE_DESCRIPTION("Texas Instruments LP8788 Backlight Driver");
MODULE_AUTHOR("Milo Kim");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:lp8788-backlight");
| linux-master | drivers/video/backlight/lp8788_bl.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for the Cirrus EP93xx lcd backlight
*
* Copyright (c) 2010 H Hartley Sweeten <[email protected]>
*
* This driver controls the pulse width modulated brightness control output,
* BRIGHT, on the Cirrus EP9307, EP9312, and EP9315 processors.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#define EP93XX_MAX_COUNT 255
#define EP93XX_MAX_BRIGHT 255
#define EP93XX_DEF_BRIGHT 128
struct ep93xxbl {
void __iomem *mmio;
int brightness;
};
static int ep93xxbl_set(struct backlight_device *bl, int brightness)
{
struct ep93xxbl *ep93xxbl = bl_get_data(bl);
writel((brightness << 8) | EP93XX_MAX_COUNT, ep93xxbl->mmio);
ep93xxbl->brightness = brightness;
return 0;
}
static int ep93xxbl_update_status(struct backlight_device *bl)
{
return ep93xxbl_set(bl, backlight_get_brightness(bl));
}
static int ep93xxbl_get_brightness(struct backlight_device *bl)
{
struct ep93xxbl *ep93xxbl = bl_get_data(bl);
return ep93xxbl->brightness;
}
static const struct backlight_ops ep93xxbl_ops = {
.update_status = ep93xxbl_update_status,
.get_brightness = ep93xxbl_get_brightness,
};
static int ep93xxbl_probe(struct platform_device *dev)
{
struct ep93xxbl *ep93xxbl;
struct backlight_device *bl;
struct backlight_properties props;
struct resource *res;
ep93xxbl = devm_kzalloc(&dev->dev, sizeof(*ep93xxbl), GFP_KERNEL);
if (!ep93xxbl)
return -ENOMEM;
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (!res)
return -ENXIO;
/*
* FIXME - We don't do a request_mem_region here because we are
* sharing the register space with the framebuffer driver (see
* drivers/video/ep93xx-fb.c) and doing so will cause the second
* loaded driver to return -EBUSY.
*
* NOTE: No locking is required; the framebuffer does not touch
* this register.
*/
ep93xxbl->mmio = devm_ioremap(&dev->dev, res->start,
resource_size(res));
if (!ep93xxbl->mmio)
return -ENXIO;
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = EP93XX_MAX_BRIGHT;
bl = devm_backlight_device_register(&dev->dev, dev->name, &dev->dev,
ep93xxbl, &ep93xxbl_ops, &props);
if (IS_ERR(bl))
return PTR_ERR(bl);
bl->props.brightness = EP93XX_DEF_BRIGHT;
platform_set_drvdata(dev, bl);
ep93xxbl_update_status(bl);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int ep93xxbl_suspend(struct device *dev)
{
struct backlight_device *bl = dev_get_drvdata(dev);
return ep93xxbl_set(bl, 0);
}
static int ep93xxbl_resume(struct device *dev)
{
struct backlight_device *bl = dev_get_drvdata(dev);
backlight_update_status(bl);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(ep93xxbl_pm_ops, ep93xxbl_suspend, ep93xxbl_resume);
static struct platform_driver ep93xxbl_driver = {
.driver = {
.name = "ep93xx-bl",
.pm = &ep93xxbl_pm_ops,
},
.probe = ep93xxbl_probe,
};
module_platform_driver(ep93xxbl_driver);
MODULE_DESCRIPTION("EP93xx Backlight Driver");
MODULE_AUTHOR("H Hartley Sweeten <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ep93xx-bl");
| linux-master | drivers/video/backlight/ep93xx_bl.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Backlight driver for Analog Devices ADP8870 Backlight Devices
*
* Copyright 2009-2011 Analog Devices Inc.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/pm.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/leds.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/platform_data/adp8870.h>
#define ADP8870_EXT_FEATURES
#define ADP8870_USE_LEDS
#define ADP8870_MFDVID 0x00 /* Manufacturer and device ID */
#define ADP8870_MDCR 0x01 /* Device mode and status */
#define ADP8870_INT_STAT 0x02 /* Interrupts status */
#define ADP8870_INT_EN 0x03 /* Interrupts enable */
#define ADP8870_CFGR 0x04 /* Configuration register */
#define ADP8870_BLSEL 0x05 /* Sink enable backlight or independent */
#define ADP8870_PWMLED 0x06 /* PWM Enable Selection Register */
#define ADP8870_BLOFF 0x07 /* Backlight off timeout */
#define ADP8870_BLDIM 0x08 /* Backlight dim timeout */
#define ADP8870_BLFR 0x09 /* Backlight fade in and out rates */
#define ADP8870_BLMX1 0x0A /* Backlight (Brightness Level 1-daylight) maximum current */
#define ADP8870_BLDM1 0x0B /* Backlight (Brightness Level 1-daylight) dim current */
#define ADP8870_BLMX2 0x0C /* Backlight (Brightness Level 2-bright) maximum current */
#define ADP8870_BLDM2 0x0D /* Backlight (Brightness Level 2-bright) dim current */
#define ADP8870_BLMX3 0x0E /* Backlight (Brightness Level 3-office) maximum current */
#define ADP8870_BLDM3 0x0F /* Backlight (Brightness Level 3-office) dim current */
#define ADP8870_BLMX4 0x10 /* Backlight (Brightness Level 4-indoor) maximum current */
#define ADP8870_BLDM4 0x11 /* Backlight (Brightness Level 4-indoor) dim current */
#define ADP8870_BLMX5 0x12 /* Backlight (Brightness Level 5-dark) maximum current */
#define ADP8870_BLDM5 0x13 /* Backlight (Brightness Level 5-dark) dim current */
#define ADP8870_ISCLAW 0x1A /* Independent sink current fade law register */
#define ADP8870_ISCC 0x1B /* Independent sink current control register */
#define ADP8870_ISCT1 0x1C /* Independent Sink Current Timer Register LED[7:5] */
#define ADP8870_ISCT2 0x1D /* Independent Sink Current Timer Register LED[4:1] */
#define ADP8870_ISCF 0x1E /* Independent sink current fade register */
#define ADP8870_ISC1 0x1F /* Independent Sink Current LED1 */
#define ADP8870_ISC2 0x20 /* Independent Sink Current LED2 */
#define ADP8870_ISC3 0x21 /* Independent Sink Current LED3 */
#define ADP8870_ISC4 0x22 /* Independent Sink Current LED4 */
#define ADP8870_ISC5 0x23 /* Independent Sink Current LED5 */
#define ADP8870_ISC6 0x24 /* Independent Sink Current LED6 */
#define ADP8870_ISC7 0x25 /* Independent Sink Current LED7 (Brightness Level 1-daylight) */
#define ADP8870_ISC7_L2 0x26 /* Independent Sink Current LED7 (Brightness Level 2-bright) */
#define ADP8870_ISC7_L3 0x27 /* Independent Sink Current LED7 (Brightness Level 3-office) */
#define ADP8870_ISC7_L4 0x28 /* Independent Sink Current LED7 (Brightness Level 4-indoor) */
#define ADP8870_ISC7_L5 0x29 /* Independent Sink Current LED7 (Brightness Level 5-dark) */
#define ADP8870_CMP_CTL 0x2D /* ALS Comparator Control Register */
#define ADP8870_ALS1_EN 0x2E /* Main ALS comparator level enable */
#define ADP8870_ALS2_EN 0x2F /* Second ALS comparator level enable */
#define ADP8870_ALS1_STAT 0x30 /* Main ALS Comparator Status Register */
#define ADP8870_ALS2_STAT 0x31 /* Second ALS Comparator Status Register */
#define ADP8870_L2TRP 0x32 /* L2 comparator reference */
#define ADP8870_L2HYS 0x33 /* L2 hysteresis */
#define ADP8870_L3TRP 0x34 /* L3 comparator reference */
#define ADP8870_L3HYS 0x35 /* L3 hysteresis */
#define ADP8870_L4TRP 0x36 /* L4 comparator reference */
#define ADP8870_L4HYS 0x37 /* L4 hysteresis */
#define ADP8870_L5TRP 0x38 /* L5 comparator reference */
#define ADP8870_L5HYS 0x39 /* L5 hysteresis */
#define ADP8870_PH1LEVL 0x40 /* First phototransistor ambient light level-low byte register */
#define ADP8870_PH1LEVH 0x41 /* First phototransistor ambient light level-high byte register */
#define ADP8870_PH2LEVL 0x42 /* Second phototransistor ambient light level-low byte register */
#define ADP8870_PH2LEVH 0x43 /* Second phototransistor ambient light level-high byte register */
#define ADP8870_MANUFID 0x3 /* Analog Devices AD8870 Manufacturer and device ID */
#define ADP8870_DEVID(x) ((x) & 0xF)
#define ADP8870_MANID(x) ((x) >> 4)
/* MDCR Device mode and status */
#define D7ALSEN (1 << 7)
#define INT_CFG (1 << 6)
#define NSTBY (1 << 5)
#define DIM_EN (1 << 4)
#define GDWN_DIS (1 << 3)
#define SIS_EN (1 << 2)
#define CMP_AUTOEN (1 << 1)
#define BLEN (1 << 0)
/* ADP8870_ALS1_EN Main ALS comparator level enable */
#define L5_EN (1 << 3)
#define L4_EN (1 << 2)
#define L3_EN (1 << 1)
#define L2_EN (1 << 0)
#define CFGR_BLV_SHIFT 3
#define CFGR_BLV_MASK 0x7
#define ADP8870_FLAG_LED_MASK 0xFF
#define FADE_VAL(in, out) ((0xF & (in)) | ((0xF & (out)) << 4))
#define BL_CFGR_VAL(law, blv) ((((blv) & CFGR_BLV_MASK) << CFGR_BLV_SHIFT) | ((0x3 & (law)) << 1))
#define ALS_CMPR_CFG_VAL(filt) ((0x7 & (filt)) << 1)
struct adp8870_bl {
struct i2c_client *client;
struct backlight_device *bl;
struct adp8870_led *led;
struct adp8870_backlight_platform_data *pdata;
struct mutex lock;
unsigned long cached_daylight_max;
int id;
int revid;
int current_brightness;
};
struct adp8870_led {
struct led_classdev cdev;
struct work_struct work;
struct i2c_client *client;
enum led_brightness new_brightness;
int id;
int flags;
};
static int adp8870_read(struct i2c_client *client, int reg, uint8_t *val)
{
int ret;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0) {
dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
return ret;
}
*val = ret;
return 0;
}
static int adp8870_write(struct i2c_client *client, u8 reg, u8 val)
{
int ret = i2c_smbus_write_byte_data(client, reg, val);
if (ret)
dev_err(&client->dev, "failed to write\n");
return ret;
}
static int adp8870_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
{
struct adp8870_bl *data = i2c_get_clientdata(client);
uint8_t reg_val;
int ret;
mutex_lock(&data->lock);
ret = adp8870_read(client, reg, ®_val);
if (!ret && ((reg_val & bit_mask) != bit_mask)) {
reg_val |= bit_mask;
ret = adp8870_write(client, reg, reg_val);
}
mutex_unlock(&data->lock);
return ret;
}
static int adp8870_clr_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
{
struct adp8870_bl *data = i2c_get_clientdata(client);
uint8_t reg_val;
int ret;
mutex_lock(&data->lock);
ret = adp8870_read(client, reg, ®_val);
if (!ret && (reg_val & bit_mask)) {
reg_val &= ~bit_mask;
ret = adp8870_write(client, reg, reg_val);
}
mutex_unlock(&data->lock);
return ret;
}
/*
* Independent sink / LED
*/
#if defined(ADP8870_USE_LEDS)
static void adp8870_led_work(struct work_struct *work)
{
struct adp8870_led *led = container_of(work, struct adp8870_led, work);
adp8870_write(led->client, ADP8870_ISC1 + led->id - 1,
led->new_brightness >> 1);
}
static void adp8870_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct adp8870_led *led;
led = container_of(led_cdev, struct adp8870_led, cdev);
led->new_brightness = value;
/*
* Use workqueue for IO since I2C operations can sleep.
*/
schedule_work(&led->work);
}
static int adp8870_led_setup(struct adp8870_led *led)
{
struct i2c_client *client = led->client;
int ret = 0;
ret = adp8870_write(client, ADP8870_ISC1 + led->id - 1, 0);
if (ret)
return ret;
ret = adp8870_set_bits(client, ADP8870_ISCC, 1 << (led->id - 1));
if (ret)
return ret;
if (led->id > 4)
ret = adp8870_set_bits(client, ADP8870_ISCT1,
(led->flags & 0x3) << ((led->id - 5) * 2));
else
ret = adp8870_set_bits(client, ADP8870_ISCT2,
(led->flags & 0x3) << ((led->id - 1) * 2));
return ret;
}
static int adp8870_led_probe(struct i2c_client *client)
{
struct adp8870_backlight_platform_data *pdata =
dev_get_platdata(&client->dev);
struct adp8870_bl *data = i2c_get_clientdata(client);
struct adp8870_led *led, *led_dat;
struct led_info *cur_led;
int ret, i;
led = devm_kcalloc(&client->dev, pdata->num_leds, sizeof(*led),
GFP_KERNEL);
if (led == NULL)
return -ENOMEM;
ret = adp8870_write(client, ADP8870_ISCLAW, pdata->led_fade_law);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_ISCT1,
(pdata->led_on_time & 0x3) << 6);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_ISCF,
FADE_VAL(pdata->led_fade_in, pdata->led_fade_out));
if (ret)
return ret;
for (i = 0; i < pdata->num_leds; ++i) {
cur_led = &pdata->leds[i];
led_dat = &led[i];
led_dat->id = cur_led->flags & ADP8870_FLAG_LED_MASK;
if (led_dat->id > 7 || led_dat->id < 1) {
dev_err(&client->dev, "Invalid LED ID %d\n",
led_dat->id);
ret = -EINVAL;
goto err;
}
if (pdata->bl_led_assign & (1 << (led_dat->id - 1))) {
dev_err(&client->dev, "LED %d used by Backlight\n",
led_dat->id);
ret = -EBUSY;
goto err;
}
led_dat->cdev.name = cur_led->name;
led_dat->cdev.default_trigger = cur_led->default_trigger;
led_dat->cdev.brightness_set = adp8870_led_set;
led_dat->cdev.brightness = LED_OFF;
led_dat->flags = cur_led->flags >> FLAG_OFFT_SHIFT;
led_dat->client = client;
led_dat->new_brightness = LED_OFF;
INIT_WORK(&led_dat->work, adp8870_led_work);
ret = led_classdev_register(&client->dev, &led_dat->cdev);
if (ret) {
dev_err(&client->dev, "failed to register LED %d\n",
led_dat->id);
goto err;
}
ret = adp8870_led_setup(led_dat);
if (ret) {
dev_err(&client->dev, "failed to write\n");
i++;
goto err;
}
}
data->led = led;
return 0;
err:
for (i = i - 1; i >= 0; --i) {
led_classdev_unregister(&led[i].cdev);
cancel_work_sync(&led[i].work);
}
return ret;
}
static int adp8870_led_remove(struct i2c_client *client)
{
struct adp8870_backlight_platform_data *pdata =
dev_get_platdata(&client->dev);
struct adp8870_bl *data = i2c_get_clientdata(client);
int i;
for (i = 0; i < pdata->num_leds; i++) {
led_classdev_unregister(&data->led[i].cdev);
cancel_work_sync(&data->led[i].work);
}
return 0;
}
#else
static int adp8870_led_probe(struct i2c_client *client)
{
return 0;
}
static int adp8870_led_remove(struct i2c_client *client)
{
return 0;
}
#endif
static int adp8870_bl_set(struct backlight_device *bl, int brightness)
{
struct adp8870_bl *data = bl_get_data(bl);
struct i2c_client *client = data->client;
int ret = 0;
if (data->pdata->en_ambl_sens) {
if ((brightness > 0) && (brightness < ADP8870_MAX_BRIGHTNESS)) {
/* Disable Ambient Light auto adjust */
ret = adp8870_clr_bits(client, ADP8870_MDCR,
CMP_AUTOEN);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_BLMX1, brightness);
if (ret)
return ret;
} else {
/*
* MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
* restore daylight l1 sysfs brightness
*/
ret = adp8870_write(client, ADP8870_BLMX1,
data->cached_daylight_max);
if (ret)
return ret;
ret = adp8870_set_bits(client, ADP8870_MDCR,
CMP_AUTOEN);
if (ret)
return ret;
}
} else {
ret = adp8870_write(client, ADP8870_BLMX1, brightness);
if (ret)
return ret;
}
if (data->current_brightness && brightness == 0)
ret = adp8870_set_bits(client,
ADP8870_MDCR, DIM_EN);
else if (data->current_brightness == 0 && brightness)
ret = adp8870_clr_bits(client,
ADP8870_MDCR, DIM_EN);
if (!ret)
data->current_brightness = brightness;
return ret;
}
static int adp8870_bl_update_status(struct backlight_device *bl)
{
return adp8870_bl_set(bl, backlight_get_brightness(bl));
}
static int adp8870_bl_get_brightness(struct backlight_device *bl)
{
struct adp8870_bl *data = bl_get_data(bl);
return data->current_brightness;
}
static const struct backlight_ops adp8870_bl_ops = {
.update_status = adp8870_bl_update_status,
.get_brightness = adp8870_bl_get_brightness,
};
static int adp8870_bl_setup(struct backlight_device *bl)
{
struct adp8870_bl *data = bl_get_data(bl);
struct i2c_client *client = data->client;
struct adp8870_backlight_platform_data *pdata = data->pdata;
int ret = 0;
ret = adp8870_write(client, ADP8870_BLSEL, ~pdata->bl_led_assign);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_PWMLED, pdata->pwm_assign);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_BLMX1, pdata->l1_daylight_max);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_BLDM1, pdata->l1_daylight_dim);
if (ret)
return ret;
if (pdata->en_ambl_sens) {
data->cached_daylight_max = pdata->l1_daylight_max;
ret = adp8870_write(client, ADP8870_BLMX2,
pdata->l2_bright_max);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_BLDM2,
pdata->l2_bright_dim);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_BLMX3,
pdata->l3_office_max);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_BLDM3,
pdata->l3_office_dim);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_BLMX4,
pdata->l4_indoor_max);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_BLDM4,
pdata->l4_indor_dim);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_BLMX5,
pdata->l5_dark_max);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_BLDM5,
pdata->l5_dark_dim);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_L2TRP, pdata->l2_trip);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_L2HYS, pdata->l2_hyst);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_L3TRP, pdata->l3_trip);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_L3HYS, pdata->l3_hyst);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_L4TRP, pdata->l4_trip);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_L4HYS, pdata->l4_hyst);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_L5TRP, pdata->l5_trip);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_L5HYS, pdata->l5_hyst);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_ALS1_EN, L5_EN | L4_EN |
L3_EN | L2_EN);
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_CMP_CTL,
ALS_CMPR_CFG_VAL(pdata->abml_filt));
if (ret)
return ret;
}
ret = adp8870_write(client, ADP8870_CFGR,
BL_CFGR_VAL(pdata->bl_fade_law, 0));
if (ret)
return ret;
ret = adp8870_write(client, ADP8870_BLFR, FADE_VAL(pdata->bl_fade_in,
pdata->bl_fade_out));
if (ret)
return ret;
/*
* ADP8870 Rev0 requires GDWN_DIS bit set
*/
ret = adp8870_set_bits(client, ADP8870_MDCR, BLEN | DIM_EN | NSTBY |
(data->revid == 0 ? GDWN_DIS : 0));
return ret;
}
static ssize_t adp8870_show(struct device *dev, char *buf, int reg)
{
struct adp8870_bl *data = dev_get_drvdata(dev);
int error;
uint8_t reg_val;
mutex_lock(&data->lock);
error = adp8870_read(data->client, reg, ®_val);
mutex_unlock(&data->lock);
if (error < 0)
return error;
return sprintf(buf, "%u\n", reg_val);
}
static ssize_t adp8870_store(struct device *dev, const char *buf,
size_t count, int reg)
{
struct adp8870_bl *data = dev_get_drvdata(dev);
unsigned long val;
int ret;
ret = kstrtoul(buf, 10, &val);
if (ret)
return ret;
mutex_lock(&data->lock);
adp8870_write(data->client, reg, val);
mutex_unlock(&data->lock);
return count;
}
static ssize_t adp8870_bl_l5_dark_max_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp8870_show(dev, buf, ADP8870_BLMX5);
}
static ssize_t adp8870_bl_l5_dark_max_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
return adp8870_store(dev, buf, count, ADP8870_BLMX5);
}
static DEVICE_ATTR(l5_dark_max, 0664, adp8870_bl_l5_dark_max_show,
adp8870_bl_l5_dark_max_store);
static ssize_t adp8870_bl_l4_indoor_max_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp8870_show(dev, buf, ADP8870_BLMX4);
}
static ssize_t adp8870_bl_l4_indoor_max_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
return adp8870_store(dev, buf, count, ADP8870_BLMX4);
}
static DEVICE_ATTR(l4_indoor_max, 0664, adp8870_bl_l4_indoor_max_show,
adp8870_bl_l4_indoor_max_store);
static ssize_t adp8870_bl_l3_office_max_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp8870_show(dev, buf, ADP8870_BLMX3);
}
static ssize_t adp8870_bl_l3_office_max_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
return adp8870_store(dev, buf, count, ADP8870_BLMX3);
}
static DEVICE_ATTR(l3_office_max, 0664, adp8870_bl_l3_office_max_show,
adp8870_bl_l3_office_max_store);
static ssize_t adp8870_bl_l2_bright_max_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp8870_show(dev, buf, ADP8870_BLMX2);
}
static ssize_t adp8870_bl_l2_bright_max_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
return adp8870_store(dev, buf, count, ADP8870_BLMX2);
}
static DEVICE_ATTR(l2_bright_max, 0664, adp8870_bl_l2_bright_max_show,
adp8870_bl_l2_bright_max_store);
static ssize_t adp8870_bl_l1_daylight_max_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp8870_show(dev, buf, ADP8870_BLMX1);
}
static ssize_t adp8870_bl_l1_daylight_max_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct adp8870_bl *data = dev_get_drvdata(dev);
int ret = kstrtoul(buf, 10, &data->cached_daylight_max);
if (ret)
return ret;
return adp8870_store(dev, buf, count, ADP8870_BLMX1);
}
static DEVICE_ATTR(l1_daylight_max, 0664, adp8870_bl_l1_daylight_max_show,
adp8870_bl_l1_daylight_max_store);
static ssize_t adp8870_bl_l5_dark_dim_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp8870_show(dev, buf, ADP8870_BLDM5);
}
static ssize_t adp8870_bl_l5_dark_dim_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
return adp8870_store(dev, buf, count, ADP8870_BLDM5);
}
static DEVICE_ATTR(l5_dark_dim, 0664, adp8870_bl_l5_dark_dim_show,
adp8870_bl_l5_dark_dim_store);
static ssize_t adp8870_bl_l4_indoor_dim_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp8870_show(dev, buf, ADP8870_BLDM4);
}
static ssize_t adp8870_bl_l4_indoor_dim_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
return adp8870_store(dev, buf, count, ADP8870_BLDM4);
}
static DEVICE_ATTR(l4_indoor_dim, 0664, adp8870_bl_l4_indoor_dim_show,
adp8870_bl_l4_indoor_dim_store);
static ssize_t adp8870_bl_l3_office_dim_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp8870_show(dev, buf, ADP8870_BLDM3);
}
static ssize_t adp8870_bl_l3_office_dim_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
return adp8870_store(dev, buf, count, ADP8870_BLDM3);
}
static DEVICE_ATTR(l3_office_dim, 0664, adp8870_bl_l3_office_dim_show,
adp8870_bl_l3_office_dim_store);
static ssize_t adp8870_bl_l2_bright_dim_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp8870_show(dev, buf, ADP8870_BLDM2);
}
static ssize_t adp8870_bl_l2_bright_dim_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
return adp8870_store(dev, buf, count, ADP8870_BLDM2);
}
static DEVICE_ATTR(l2_bright_dim, 0664, adp8870_bl_l2_bright_dim_show,
adp8870_bl_l2_bright_dim_store);
static ssize_t adp8870_bl_l1_daylight_dim_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return adp8870_show(dev, buf, ADP8870_BLDM1);
}
static ssize_t adp8870_bl_l1_daylight_dim_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
return adp8870_store(dev, buf, count, ADP8870_BLDM1);
}
static DEVICE_ATTR(l1_daylight_dim, 0664, adp8870_bl_l1_daylight_dim_show,
adp8870_bl_l1_daylight_dim_store);
#ifdef ADP8870_EXT_FEATURES
static ssize_t adp8870_bl_ambient_light_level_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct adp8870_bl *data = dev_get_drvdata(dev);
int error;
uint8_t reg_val;
uint16_t ret_val;
mutex_lock(&data->lock);
error = adp8870_read(data->client, ADP8870_PH1LEVL, ®_val);
if (error < 0) {
mutex_unlock(&data->lock);
return error;
}
ret_val = reg_val;
error = adp8870_read(data->client, ADP8870_PH1LEVH, ®_val);
mutex_unlock(&data->lock);
if (error < 0)
return error;
/* Return 13-bit conversion value for the first light sensor */
ret_val += (reg_val & 0x1F) << 8;
return sprintf(buf, "%u\n", ret_val);
}
static DEVICE_ATTR(ambient_light_level, 0444,
adp8870_bl_ambient_light_level_show, NULL);
static ssize_t adp8870_bl_ambient_light_zone_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct adp8870_bl *data = dev_get_drvdata(dev);
int error;
uint8_t reg_val;
mutex_lock(&data->lock);
error = adp8870_read(data->client, ADP8870_CFGR, ®_val);
mutex_unlock(&data->lock);
if (error < 0)
return error;
return sprintf(buf, "%u\n",
((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1);
}
static ssize_t adp8870_bl_ambient_light_zone_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct adp8870_bl *data = dev_get_drvdata(dev);
unsigned long val;
uint8_t reg_val;
int ret;
ret = kstrtoul(buf, 10, &val);
if (ret)
return ret;
if (val == 0) {
/* Enable automatic ambient light sensing */
adp8870_set_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
} else if ((val > 0) && (val < 6)) {
/* Disable automatic ambient light sensing */
adp8870_clr_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);
/* Set user supplied ambient light zone */
mutex_lock(&data->lock);
ret = adp8870_read(data->client, ADP8870_CFGR, ®_val);
if (!ret) {
reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
reg_val |= (val - 1) << CFGR_BLV_SHIFT;
adp8870_write(data->client, ADP8870_CFGR, reg_val);
}
mutex_unlock(&data->lock);
}
return count;
}
static DEVICE_ATTR(ambient_light_zone, 0664,
adp8870_bl_ambient_light_zone_show,
adp8870_bl_ambient_light_zone_store);
#endif
static struct attribute *adp8870_bl_attributes[] = {
&dev_attr_l5_dark_max.attr,
&dev_attr_l5_dark_dim.attr,
&dev_attr_l4_indoor_max.attr,
&dev_attr_l4_indoor_dim.attr,
&dev_attr_l3_office_max.attr,
&dev_attr_l3_office_dim.attr,
&dev_attr_l2_bright_max.attr,
&dev_attr_l2_bright_dim.attr,
&dev_attr_l1_daylight_max.attr,
&dev_attr_l1_daylight_dim.attr,
#ifdef ADP8870_EXT_FEATURES
&dev_attr_ambient_light_level.attr,
&dev_attr_ambient_light_zone.attr,
#endif
NULL
};
static const struct attribute_group adp8870_bl_attr_group = {
.attrs = adp8870_bl_attributes,
};
static int adp8870_probe(struct i2c_client *client)
{
const struct i2c_device_id *id = i2c_client_get_device_id(client);
struct backlight_properties props;
struct backlight_device *bl;
struct adp8870_bl *data;
struct adp8870_backlight_platform_data *pdata =
dev_get_platdata(&client->dev);
uint8_t reg_val;
int ret;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
return -EIO;
}
if (!pdata) {
dev_err(&client->dev, "no platform data?\n");
return -EINVAL;
}
ret = adp8870_read(client, ADP8870_MFDVID, ®_val);
if (ret < 0)
return -EIO;
if (ADP8870_MANID(reg_val) != ADP8870_MANUFID) {
dev_err(&client->dev, "failed to probe\n");
return -ENODEV;
}
data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
data->revid = ADP8870_DEVID(reg_val);
data->client = client;
data->pdata = pdata;
data->id = id->driver_data;
data->current_brightness = 0;
i2c_set_clientdata(client, data);
mutex_init(&data->lock);
memset(&props, 0, sizeof(props));
props.type = BACKLIGHT_RAW;
props.max_brightness = props.brightness = ADP8870_MAX_BRIGHTNESS;
bl = devm_backlight_device_register(&client->dev,
dev_driver_string(&client->dev),
&client->dev, data, &adp8870_bl_ops, &props);
if (IS_ERR(bl)) {
dev_err(&client->dev, "failed to register backlight\n");
return PTR_ERR(bl);
}
data->bl = bl;
if (pdata->en_ambl_sens) {
ret = sysfs_create_group(&bl->dev.kobj,
&adp8870_bl_attr_group);
if (ret) {
dev_err(&client->dev, "failed to register sysfs\n");
return ret;
}
}
ret = adp8870_bl_setup(bl);
if (ret) {
ret = -EIO;
goto out;
}
backlight_update_status(bl);
dev_info(&client->dev, "Rev.%d Backlight\n", data->revid);
if (pdata->num_leds)
adp8870_led_probe(client);
return 0;
out:
if (data->pdata->en_ambl_sens)
sysfs_remove_group(&data->bl->dev.kobj,
&adp8870_bl_attr_group);
return ret;
}
static void adp8870_remove(struct i2c_client *client)
{
struct adp8870_bl *data = i2c_get_clientdata(client);
adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);
if (data->led)
adp8870_led_remove(client);
if (data->pdata->en_ambl_sens)
sysfs_remove_group(&data->bl->dev.kobj,
&adp8870_bl_attr_group);
}
#ifdef CONFIG_PM_SLEEP
static int adp8870_i2c_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);
return 0;
}
static int adp8870_i2c_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
adp8870_set_bits(client, ADP8870_MDCR, NSTBY | BLEN);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(adp8870_i2c_pm_ops, adp8870_i2c_suspend,
adp8870_i2c_resume);
static const struct i2c_device_id adp8870_id[] = {
{ "adp8870", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, adp8870_id);
static struct i2c_driver adp8870_driver = {
.driver = {
.name = KBUILD_MODNAME,
.pm = &adp8870_i2c_pm_ops,
},
.probe = adp8870_probe,
.remove = adp8870_remove,
.id_table = adp8870_id,
};
module_i2c_driver(adp8870_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Michael Hennerich <[email protected]>");
MODULE_DESCRIPTION("ADP8870 Backlight driver");
| linux-master | drivers/video/backlight/adp8870_bl.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Backlight control code for Sharp Zaurus SL-5500
*
* Copyright 2005 John Lenz <[email protected]>
* Maintainer: Pavel Machek <[email protected]> (unless John wants to :-)
*
* This driver assumes single CPU. That's okay, because collie is
* slightly old hardware, and no one is going to retrofit second CPU to
* old PDA.
*/
/* LCD power functions */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <asm/hardware/locomo.h>
#include <asm/irq.h>
#include <asm/mach/sharpsl_param.h>
#include <asm/mach-types.h>
#include "../../../arch/arm/mach-sa1100/generic.h"
static struct backlight_device *locomolcd_bl_device;
static struct locomo_dev *locomolcd_dev;
static unsigned long locomolcd_flags;
#define LOCOMOLCD_SUSPENDED 0x01
static void locomolcd_on(int comadj)
{
locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0);
locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 1);
mdelay(2);
locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0);
locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 1);
mdelay(2);
locomo_m62332_senddata(locomolcd_dev, comadj, 0);
mdelay(5);
locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0);
locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 1);
mdelay(10);
/* TFTCRST | CPSOUT=0 | CPSEN */
locomo_writel(0x01, locomolcd_dev->mapbase + LOCOMO_TC);
/* Set CPSD */
locomo_writel(6, locomolcd_dev->mapbase + LOCOMO_CPSD);
/* TFTCRST | CPSOUT=0 | CPSEN */
locomo_writel((0x04 | 0x01), locomolcd_dev->mapbase + LOCOMO_TC);
mdelay(10);
locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 0);
locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 1);
}
static void locomolcd_off(int comadj)
{
/* TFTCRST=1 | CPSOUT=1 | CPSEN = 0 */
locomo_writel(0x06, locomolcd_dev->mapbase + LOCOMO_TC);
mdelay(1);
locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0);
mdelay(110);
locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0);
mdelay(700);
/* TFTCRST=0 | CPSOUT=0 | CPSEN = 0 */
locomo_writel(0, locomolcd_dev->mapbase + LOCOMO_TC);
locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 0);
locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0);
}
void locomolcd_power(int on)
{
int comadj = sharpsl_param.comadj;
unsigned long flags;
local_irq_save(flags);
if (!locomolcd_dev) {
local_irq_restore(flags);
return;
}
/* read comadj */
if (comadj == -1 && machine_is_collie())
comadj = 128;
if (on)
locomolcd_on(comadj);
else
locomolcd_off(comadj);
local_irq_restore(flags);
}
EXPORT_SYMBOL(locomolcd_power);
static int current_intensity;
static int locomolcd_set_intensity(struct backlight_device *bd)
{
int intensity = backlight_get_brightness(bd);
if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
intensity = 0;
switch (intensity) {
/*
* AC and non-AC are handled differently,
* but produce same results in sharp code?
*/
case 0:
locomo_frontlight_set(locomolcd_dev, 0, 0, 161);
break;
case 1:
locomo_frontlight_set(locomolcd_dev, 117, 0, 161);
break;
case 2:
locomo_frontlight_set(locomolcd_dev, 163, 0, 148);
break;
case 3:
locomo_frontlight_set(locomolcd_dev, 194, 0, 161);
break;
case 4:
locomo_frontlight_set(locomolcd_dev, 194, 1, 161);
break;
default:
return -ENODEV;
}
current_intensity = intensity;
return 0;
}
static int locomolcd_get_intensity(struct backlight_device *bd)
{
return current_intensity;
}
static const struct backlight_ops locomobl_data = {
.get_brightness = locomolcd_get_intensity,
.update_status = locomolcd_set_intensity,
};
#ifdef CONFIG_PM_SLEEP
static int locomolcd_suspend(struct device *dev)
{
locomolcd_flags |= LOCOMOLCD_SUSPENDED;
locomolcd_set_intensity(locomolcd_bl_device);
return 0;
}
static int locomolcd_resume(struct device *dev)
{
locomolcd_flags &= ~LOCOMOLCD_SUSPENDED;
locomolcd_set_intensity(locomolcd_bl_device);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume);
static int locomolcd_probe(struct locomo_dev *ldev)
{
struct backlight_properties props;
unsigned long flags;
local_irq_save(flags);
locomolcd_dev = ldev;
locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
local_irq_restore(flags);
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = 4;
locomolcd_bl_device = backlight_device_register("locomo-bl",
&ldev->dev, NULL,
&locomobl_data, &props);
if (IS_ERR(locomolcd_bl_device))
return PTR_ERR(locomolcd_bl_device);
/* Set up frontlight so that screen is readable */
locomolcd_bl_device->props.brightness = 2;
locomolcd_set_intensity(locomolcd_bl_device);
return 0;
}
static void locomolcd_remove(struct locomo_dev *dev)
{
unsigned long flags;
locomolcd_bl_device->props.brightness = 0;
locomolcd_bl_device->props.power = 0;
locomolcd_set_intensity(locomolcd_bl_device);
backlight_device_unregister(locomolcd_bl_device);
local_irq_save(flags);
locomolcd_dev = NULL;
local_irq_restore(flags);
}
static struct locomo_driver poodle_lcd_driver = {
.drv = {
.name = "locomo-backlight",
.pm = &locomolcd_pm_ops,
},
.devid = LOCOMO_DEVID_BACKLIGHT,
.probe = locomolcd_probe,
.remove = locomolcd_remove,
};
static int __init locomolcd_init(void)
{
return locomo_driver_register(&poodle_lcd_driver);
}
static void __exit locomolcd_exit(void)
{
locomo_driver_unregister(&poodle_lcd_driver);
}
module_init(locomolcd_init);
module_exit(locomolcd_exit);
MODULE_AUTHOR("John Lenz <[email protected]>, Pavel Machek <[email protected]>");
MODULE_DESCRIPTION("Collie LCD driver");
MODULE_LICENSE("GPL");
| linux-master | drivers/video/backlight/locomolcd.c |
// SPDX-License-Identifier: GPL-2.0-only
/* drivers/video/backlight/platform_lcd.c
*
* Copyright 2008 Simtec Electronics
* Ben Dooks <[email protected]>
*
* Generic platform-device LCD power control interface.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/lcd.h>
#include <linux/slab.h>
#include <video/platform_lcd.h>
struct platform_lcd {
struct device *us;
struct lcd_device *lcd;
struct plat_lcd_data *pdata;
unsigned int power;
unsigned int suspended:1;
};
static inline struct platform_lcd *to_our_lcd(struct lcd_device *lcd)
{
return lcd_get_data(lcd);
}
static int platform_lcd_get_power(struct lcd_device *lcd)
{
struct platform_lcd *plcd = to_our_lcd(lcd);
return plcd->power;
}
static int platform_lcd_set_power(struct lcd_device *lcd, int power)
{
struct platform_lcd *plcd = to_our_lcd(lcd);
int lcd_power = 1;
if (power == FB_BLANK_POWERDOWN || plcd->suspended)
lcd_power = 0;
plcd->pdata->set_power(plcd->pdata, lcd_power);
plcd->power = power;
return 0;
}
static int platform_lcd_match(struct lcd_device *lcd, struct fb_info *info)
{
struct platform_lcd *plcd = to_our_lcd(lcd);
struct plat_lcd_data *pdata = plcd->pdata;
if (pdata->match_fb)
return pdata->match_fb(pdata, info);
return plcd->us->parent == info->device;
}
static struct lcd_ops platform_lcd_ops = {
.get_power = platform_lcd_get_power,
.set_power = platform_lcd_set_power,
.check_fb = platform_lcd_match,
};
static int platform_lcd_probe(struct platform_device *pdev)
{
struct plat_lcd_data *pdata;
struct platform_lcd *plcd;
struct device *dev = &pdev->dev;
int err;
pdata = dev_get_platdata(&pdev->dev);
if (!pdata) {
dev_err(dev, "no platform data supplied\n");
return -EINVAL;
}
if (pdata->probe) {
err = pdata->probe(pdata);
if (err)
return err;
}
plcd = devm_kzalloc(&pdev->dev, sizeof(struct platform_lcd),
GFP_KERNEL);
if (!plcd)
return -ENOMEM;
plcd->us = dev;
plcd->pdata = pdata;
plcd->lcd = devm_lcd_device_register(&pdev->dev, dev_name(dev), dev,
plcd, &platform_lcd_ops);
if (IS_ERR(plcd->lcd)) {
dev_err(dev, "cannot register lcd device\n");
return PTR_ERR(plcd->lcd);
}
platform_set_drvdata(pdev, plcd);
platform_lcd_set_power(plcd->lcd, FB_BLANK_NORMAL);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int platform_lcd_suspend(struct device *dev)
{
struct platform_lcd *plcd = dev_get_drvdata(dev);
plcd->suspended = 1;
platform_lcd_set_power(plcd->lcd, plcd->power);
return 0;
}
static int platform_lcd_resume(struct device *dev)
{
struct platform_lcd *plcd = dev_get_drvdata(dev);
plcd->suspended = 0;
platform_lcd_set_power(plcd->lcd, plcd->power);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(platform_lcd_pm_ops, platform_lcd_suspend,
platform_lcd_resume);
static struct platform_driver platform_lcd_driver = {
.driver = {
.name = "platform-lcd",
.pm = &platform_lcd_pm_ops,
},
.probe = platform_lcd_probe,
};
module_platform_driver(platform_lcd_driver);
MODULE_AUTHOR("Ben Dooks <[email protected]>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:platform-lcd");
| linux-master | drivers/video/backlight/platform_lcd.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Backlight Driver for Dialog DA9052 PMICs
*
* Copyright(c) 2012 Dialog Semiconductor Ltd.
*
* Author: David Dajun Chen <[email protected]>
*/
#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/reg.h>
#define DA9052_MAX_BRIGHTNESS 0xFF
enum {
DA9052_WLEDS_OFF,
DA9052_WLEDS_ON,
};
enum {
DA9052_TYPE_WLED1,
DA9052_TYPE_WLED2,
DA9052_TYPE_WLED3,
};
static const unsigned char wled_bank[] = {
DA9052_LED1_CONF_REG,
DA9052_LED2_CONF_REG,
DA9052_LED3_CONF_REG,
};
struct da9052_bl {
struct da9052 *da9052;
uint brightness;
uint state;
uint led_reg;
};
static int da9052_adjust_wled_brightness(struct da9052_bl *wleds)
{
unsigned char boost_en;
unsigned char i_sink;
int ret;
boost_en = 0x3F;
i_sink = 0xFF;
if (wleds->state == DA9052_WLEDS_OFF) {
boost_en = 0x00;
i_sink = 0x00;
}
ret = da9052_reg_write(wleds->da9052, DA9052_BOOST_REG, boost_en);
if (ret < 0)
return ret;
ret = da9052_reg_write(wleds->da9052, DA9052_LED_CONT_REG, i_sink);
if (ret < 0)
return ret;
ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg], 0x0);
if (ret < 0)
return ret;
usleep_range(10000, 11000);
if (wleds->brightness) {
ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg],
wleds->brightness);
if (ret < 0)
return ret;
}
return 0;
}
static int da9052_backlight_update_status(struct backlight_device *bl)
{
int brightness = bl->props.brightness;
struct da9052_bl *wleds = bl_get_data(bl);
wleds->brightness = brightness;
wleds->state = DA9052_WLEDS_ON;
return da9052_adjust_wled_brightness(wleds);
}
static int da9052_backlight_get_brightness(struct backlight_device *bl)
{
struct da9052_bl *wleds = bl_get_data(bl);
return wleds->brightness;
}
static const struct backlight_ops da9052_backlight_ops = {
.update_status = da9052_backlight_update_status,
.get_brightness = da9052_backlight_get_brightness,
};
static int da9052_backlight_probe(struct platform_device *pdev)
{
struct backlight_device *bl;
struct backlight_properties props;
struct da9052_bl *wleds;
wleds = devm_kzalloc(&pdev->dev, sizeof(struct da9052_bl), GFP_KERNEL);
if (!wleds)
return -ENOMEM;
wleds->da9052 = dev_get_drvdata(pdev->dev.parent);
wleds->brightness = 0;
wleds->led_reg = platform_get_device_id(pdev)->driver_data;
wleds->state = DA9052_WLEDS_OFF;
props.type = BACKLIGHT_RAW;
props.max_brightness = DA9052_MAX_BRIGHTNESS;
bl = devm_backlight_device_register(&pdev->dev, pdev->name,
wleds->da9052->dev, wleds,
&da9052_backlight_ops, &props);
if (IS_ERR(bl)) {
dev_err(&pdev->dev, "Failed to register backlight\n");
return PTR_ERR(bl);
}
bl->props.max_brightness = DA9052_MAX_BRIGHTNESS;
bl->props.brightness = 0;
platform_set_drvdata(pdev, bl);
return da9052_adjust_wled_brightness(wleds);
}
static void da9052_backlight_remove(struct platform_device *pdev)
{
struct backlight_device *bl = platform_get_drvdata(pdev);
struct da9052_bl *wleds = bl_get_data(bl);
wleds->brightness = 0;
wleds->state = DA9052_WLEDS_OFF;
da9052_adjust_wled_brightness(wleds);
}
static const struct platform_device_id da9052_wled_ids[] = {
{
.name = "da9052-wled1",
.driver_data = DA9052_TYPE_WLED1,
},
{
.name = "da9052-wled2",
.driver_data = DA9052_TYPE_WLED2,
},
{
.name = "da9052-wled3",
.driver_data = DA9052_TYPE_WLED3,
},
{ },
};
MODULE_DEVICE_TABLE(platform, da9052_wled_ids);
static struct platform_driver da9052_wled_driver = {
.probe = da9052_backlight_probe,
.remove_new = da9052_backlight_remove,
.id_table = da9052_wled_ids,
.driver = {
.name = "da9052-wled",
},
};
module_platform_driver(da9052_wled_driver);
MODULE_AUTHOR("David Dajun Chen <[email protected]>");
MODULE_DESCRIPTION("Backlight driver for DA9052 PMIC");
MODULE_LICENSE("GPL");
| linux-master | drivers/video/backlight/da9052_bl.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* sky81452-backlight.c SKY81452 backlight driver
*
* Copyright 2014 Skyworks Solutions Inc.
* Author : Gyungoh Yoo <[email protected]>
*/
#include <linux/backlight.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
/* registers */
#define SKY81452_REG0 0x00
#define SKY81452_REG1 0x01
#define SKY81452_REG2 0x02
#define SKY81452_REG4 0x04
#define SKY81452_REG5 0x05
/* bit mask */
#define SKY81452_CS 0xFF
#define SKY81452_EN 0x3F
#define SKY81452_IGPW 0x20
#define SKY81452_PWMMD 0x10
#define SKY81452_PHASE 0x08
#define SKY81452_ILIM 0x04
#define SKY81452_VSHRT 0x03
#define SKY81452_OCP 0x80
#define SKY81452_OTMP 0x40
#define SKY81452_SHRT 0x3F
#define SKY81452_OPN 0x3F
#define SKY81452_DEFAULT_NAME "lcd-backlight"
#define SKY81452_MAX_BRIGHTNESS (SKY81452_CS + 1)
/**
* struct sky81452_bl_platform_data - backlight platform data
* @name: backlight driver name.
* If it is not defined, default name is lcd-backlight.
* @gpiod_enable:GPIO descriptor which control EN pin
* @enable: Enable mask for current sink channel 1, 2, 3, 4, 5 and 6.
* @ignore_pwm: true if DPWMI should be ignored.
* @dpwm_mode: true is DPWM dimming mode, otherwise Analog dimming mode.
* @phase_shift:true is phase shift mode.
* @short_detection_threshold: It should be one of 4, 5, 6 and 7V.
* @boost_current_limit: It should be one of 2300, 2750mA.
*/
struct sky81452_bl_platform_data {
const char *name;
struct gpio_desc *gpiod_enable;
unsigned int enable;
bool ignore_pwm;
bool dpwm_mode;
bool phase_shift;
unsigned int short_detection_threshold;
unsigned int boost_current_limit;
};
#define CTZ(b) __builtin_ctz(b)
static int sky81452_bl_update_status(struct backlight_device *bd)
{
const struct sky81452_bl_platform_data *pdata =
dev_get_platdata(bd->dev.parent);
const unsigned int brightness = (unsigned int)bd->props.brightness;
struct regmap *regmap = bl_get_data(bd);
int ret;
if (brightness > 0) {
ret = regmap_write(regmap, SKY81452_REG0, brightness - 1);
if (ret < 0)
return ret;
return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
pdata->enable << CTZ(SKY81452_EN));
}
return regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN, 0);
}
static const struct backlight_ops sky81452_bl_ops = {
.update_status = sky81452_bl_update_status,
};
static ssize_t sky81452_bl_store_enable(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct regmap *regmap = bl_get_data(to_backlight_device(dev));
unsigned long value;
int ret;
ret = kstrtoul(buf, 16, &value);
if (ret < 0)
return ret;
ret = regmap_update_bits(regmap, SKY81452_REG1, SKY81452_EN,
value << CTZ(SKY81452_EN));
if (ret < 0)
return ret;
return count;
}
static ssize_t sky81452_bl_show_open_short(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct regmap *regmap = bl_get_data(to_backlight_device(dev));
unsigned int reg, value = 0;
char tmp[3];
int i, ret;
reg = !strcmp(attr->attr.name, "open") ? SKY81452_REG5 : SKY81452_REG4;
ret = regmap_read(regmap, reg, &value);
if (ret < 0)
return ret;
if (value & SKY81452_SHRT) {
*buf = 0;
for (i = 0; i < 6; i++) {
if (value & 0x01) {
sprintf(tmp, "%d ", i + 1);
strcat(buf, tmp);
}
value >>= 1;
}
strcat(buf, "\n");
} else {
strcpy(buf, "none\n");
}
return strlen(buf);
}
static ssize_t sky81452_bl_show_fault(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct regmap *regmap = bl_get_data(to_backlight_device(dev));
unsigned int value = 0;
int ret;
ret = regmap_read(regmap, SKY81452_REG4, &value);
if (ret < 0)
return ret;
*buf = 0;
if (value & SKY81452_OCP)
strcat(buf, "over-current ");
if (value & SKY81452_OTMP)
strcat(buf, "over-temperature");
strcat(buf, "\n");
return strlen(buf);
}
static DEVICE_ATTR(enable, S_IWGRP | S_IWUSR, NULL, sky81452_bl_store_enable);
static DEVICE_ATTR(open, S_IRUGO, sky81452_bl_show_open_short, NULL);
static DEVICE_ATTR(short, S_IRUGO, sky81452_bl_show_open_short, NULL);
static DEVICE_ATTR(fault, S_IRUGO, sky81452_bl_show_fault, NULL);
static struct attribute *sky81452_bl_attribute[] = {
&dev_attr_enable.attr,
&dev_attr_open.attr,
&dev_attr_short.attr,
&dev_attr_fault.attr,
NULL
};
static const struct attribute_group sky81452_bl_attr_group = {
.attrs = sky81452_bl_attribute,
};
#ifdef CONFIG_OF
static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
struct device *dev)
{
struct device_node *np = of_node_get(dev->of_node);
struct sky81452_bl_platform_data *pdata;
int num_entry;
unsigned int sources[6];
int ret;
if (!np) {
dev_err(dev, "backlight node not found.\n");
return ERR_PTR(-ENODATA);
}
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
of_node_put(np);
return ERR_PTR(-ENOMEM);
}
of_property_read_string(np, "name", &pdata->name);
pdata->ignore_pwm = of_property_read_bool(np, "skyworks,ignore-pwm");
pdata->dpwm_mode = of_property_read_bool(np, "skyworks,dpwm-mode");
pdata->phase_shift = of_property_read_bool(np, "skyworks,phase-shift");
pdata->gpiod_enable = devm_gpiod_get_optional(dev, NULL, GPIOD_OUT_HIGH);
ret = of_property_count_u32_elems(np, "led-sources");
if (ret < 0) {
pdata->enable = SKY81452_EN >> CTZ(SKY81452_EN);
} else {
num_entry = ret;
if (num_entry > 6)
num_entry = 6;
ret = of_property_read_u32_array(np, "led-sources", sources,
num_entry);
if (ret < 0) {
dev_err(dev, "led-sources node is invalid.\n");
of_node_put(np);
return ERR_PTR(-EINVAL);
}
pdata->enable = 0;
while (--num_entry)
pdata->enable |= (1 << sources[num_entry]);
}
ret = of_property_read_u32(np,
"skyworks,short-detection-threshold-volt",
&pdata->short_detection_threshold);
if (ret < 0)
pdata->short_detection_threshold = 7;
ret = of_property_read_u32(np, "skyworks,current-limit-mA",
&pdata->boost_current_limit);
if (ret < 0)
pdata->boost_current_limit = 2750;
of_node_put(np);
return pdata;
}
#else
static struct sky81452_bl_platform_data *sky81452_bl_parse_dt(
struct device *dev)
{
return ERR_PTR(-EINVAL);
}
#endif
static int sky81452_bl_init_device(struct regmap *regmap,
struct sky81452_bl_platform_data *pdata)
{
unsigned int value;
value = pdata->ignore_pwm ? SKY81452_IGPW : 0;
value |= pdata->dpwm_mode ? SKY81452_PWMMD : 0;
value |= pdata->phase_shift ? 0 : SKY81452_PHASE;
if (pdata->boost_current_limit == 2300)
value |= SKY81452_ILIM;
else if (pdata->boost_current_limit != 2750)
return -EINVAL;
if (pdata->short_detection_threshold < 4 ||
pdata->short_detection_threshold > 7)
return -EINVAL;
value |= (7 - pdata->short_detection_threshold) << CTZ(SKY81452_VSHRT);
return regmap_write(regmap, SKY81452_REG2, value);
}
static int sky81452_bl_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct regmap *regmap = dev_get_drvdata(dev->parent);
struct sky81452_bl_platform_data *pdata;
struct backlight_device *bd;
struct backlight_properties props;
const char *name;
int ret;
pdata = sky81452_bl_parse_dt(dev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
ret = sky81452_bl_init_device(regmap, pdata);
if (ret < 0) {
dev_err(dev, "failed to initialize. err=%d\n", ret);
return ret;
}
memset(&props, 0, sizeof(props));
props.max_brightness = SKY81452_MAX_BRIGHTNESS;
name = pdata->name ? pdata->name : SKY81452_DEFAULT_NAME;
bd = devm_backlight_device_register(dev, name, dev, regmap,
&sky81452_bl_ops, &props);
if (IS_ERR(bd)) {
dev_err(dev, "failed to register. err=%ld\n", PTR_ERR(bd));
return PTR_ERR(bd);
}
platform_set_drvdata(pdev, bd);
ret = sysfs_create_group(&bd->dev.kobj, &sky81452_bl_attr_group);
if (ret < 0) {
dev_err(dev, "failed to create attribute. err=%d\n", ret);
return ret;
}
return ret;
}
static void sky81452_bl_remove(struct platform_device *pdev)
{
const struct sky81452_bl_platform_data *pdata =
dev_get_platdata(&pdev->dev);
struct backlight_device *bd = platform_get_drvdata(pdev);
sysfs_remove_group(&bd->dev.kobj, &sky81452_bl_attr_group);
bd->props.power = FB_BLANK_UNBLANK;
bd->props.brightness = 0;
backlight_update_status(bd);
if (pdata->gpiod_enable)
gpiod_set_value_cansleep(pdata->gpiod_enable, 0);
}
#ifdef CONFIG_OF
static const struct of_device_id sky81452_bl_of_match[] = {
{ .compatible = "skyworks,sky81452-backlight", },
{ }
};
MODULE_DEVICE_TABLE(of, sky81452_bl_of_match);
#endif
static struct platform_driver sky81452_bl_driver = {
.driver = {
.name = "sky81452-backlight",
.of_match_table = of_match_ptr(sky81452_bl_of_match),
},
.probe = sky81452_bl_probe,
.remove_new = sky81452_bl_remove,
};
module_platform_driver(sky81452_bl_driver);
MODULE_DESCRIPTION("Skyworks SKY81452 backlight driver");
MODULE_AUTHOR("Gyungoh Yoo <[email protected]>");
MODULE_LICENSE("GPL v2");
| linux-master | drivers/video/backlight/sky81452-backlight.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Backlight driver for OMAP based boards.
*
* Copyright (c) 2006 Andrzej Zaborowski <[email protected]>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/slab.h>
#include <linux/platform_data/omap1_bl.h>
#include <linux/soc/ti/omap1-io.h>
#include <linux/soc/ti/omap1-mux.h>
#define OMAPBL_MAX_INTENSITY 0xff
struct omap_backlight {
int powermode;
int current_intensity;
struct device *dev;
struct omap_backlight_config *pdata;
};
static inline void omapbl_send_intensity(int intensity)
{
omap_writeb(intensity, OMAP_PWL_ENABLE);
}
static inline void omapbl_send_enable(int enable)
{
omap_writeb(enable, OMAP_PWL_CLK_ENABLE);
}
static void omapbl_blank(struct omap_backlight *bl, int mode)
{
if (bl->pdata->set_power)
bl->pdata->set_power(bl->dev, mode);
switch (mode) {
case FB_BLANK_NORMAL:
case FB_BLANK_VSYNC_SUSPEND:
case FB_BLANK_HSYNC_SUSPEND:
case FB_BLANK_POWERDOWN:
omapbl_send_intensity(0);
omapbl_send_enable(0);
break;
case FB_BLANK_UNBLANK:
omapbl_send_intensity(bl->current_intensity);
omapbl_send_enable(1);
break;
}
}
#ifdef CONFIG_PM_SLEEP
static int omapbl_suspend(struct device *dev)
{
struct backlight_device *bl_dev = dev_get_drvdata(dev);
struct omap_backlight *bl = bl_get_data(bl_dev);
omapbl_blank(bl, FB_BLANK_POWERDOWN);
return 0;
}
static int omapbl_resume(struct device *dev)
{
struct backlight_device *bl_dev = dev_get_drvdata(dev);
struct omap_backlight *bl = bl_get_data(bl_dev);
omapbl_blank(bl, bl->powermode);
return 0;
}
#endif
static int omapbl_set_power(struct backlight_device *dev, int state)
{
struct omap_backlight *bl = bl_get_data(dev);
omapbl_blank(bl, state);
bl->powermode = state;
return 0;
}
static int omapbl_update_status(struct backlight_device *dev)
{
struct omap_backlight *bl = bl_get_data(dev);
if (bl->current_intensity != dev->props.brightness) {
if (bl->powermode == FB_BLANK_UNBLANK)
omapbl_send_intensity(dev->props.brightness);
bl->current_intensity = dev->props.brightness;
}
if (dev->props.fb_blank != bl->powermode)
omapbl_set_power(dev, dev->props.fb_blank);
return 0;
}
static int omapbl_get_intensity(struct backlight_device *dev)
{
struct omap_backlight *bl = bl_get_data(dev);
return bl->current_intensity;
}
static const struct backlight_ops omapbl_ops = {
.get_brightness = omapbl_get_intensity,
.update_status = omapbl_update_status,
};
static int omapbl_probe(struct platform_device *pdev)
{
struct backlight_properties props;
struct backlight_device *dev;
struct omap_backlight *bl;
struct omap_backlight_config *pdata = dev_get_platdata(&pdev->dev);
if (!pdata)
return -ENXIO;
bl = devm_kzalloc(&pdev->dev, sizeof(struct omap_backlight),
GFP_KERNEL);
if (unlikely(!bl))
return -ENOMEM;
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = OMAPBL_MAX_INTENSITY;
dev = devm_backlight_device_register(&pdev->dev, "omap-bl", &pdev->dev,
bl, &omapbl_ops, &props);
if (IS_ERR(dev))
return PTR_ERR(dev);
bl->powermode = FB_BLANK_POWERDOWN;
bl->current_intensity = 0;
bl->pdata = pdata;
bl->dev = &pdev->dev;
platform_set_drvdata(pdev, dev);
omap_cfg_reg(PWL); /* Conflicts with UART3 */
dev->props.fb_blank = FB_BLANK_UNBLANK;
dev->props.brightness = pdata->default_intensity;
omapbl_update_status(dev);
dev_info(&pdev->dev, "OMAP LCD backlight initialised\n");
return 0;
}
static SIMPLE_DEV_PM_OPS(omapbl_pm_ops, omapbl_suspend, omapbl_resume);
static struct platform_driver omapbl_driver = {
.probe = omapbl_probe,
.driver = {
.name = "omap-bl",
.pm = &omapbl_pm_ops,
},
};
module_platform_driver(omapbl_driver);
MODULE_AUTHOR("Andrzej Zaborowski <[email protected]>");
MODULE_DESCRIPTION("OMAP LCD Backlight driver");
MODULE_LICENSE("GPL");
| linux-master | drivers/video/backlight/omap1_bl.c |
// SPDX-License-Identifier: GPL-2.0-only
/*
* Backlight driver for ArcticSand ARC_X_C_0N_0N Devices
*
* Copyright 2016 ArcticSand, Inc.
* Author : Brian Dodge <[email protected]>
*/
#include <linux/backlight.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/slab.h>
enum arcxcnn_chip_id {
ARC2C0608
};
/**
* struct arcxcnn_platform_data
* @name : Backlight driver name (NULL will use default)
* @initial_brightness : initial value of backlight brightness
* @leden : initial LED string enables, upper bit is global on/off
* @led_config_0 : fading speed (period between intensity steps)
* @led_config_1 : misc settings, see datasheet
* @dim_freq : pwm dimming frequency if in pwm mode
* @comp_config : misc config, see datasheet
* @filter_config : RC/PWM filter config, see datasheet
* @trim_config : full scale current trim, see datasheet
*/
struct arcxcnn_platform_data {
const char *name;
u16 initial_brightness;
u8 leden;
u8 led_config_0;
u8 led_config_1;
u8 dim_freq;
u8 comp_config;
u8 filter_config;
u8 trim_config;
};
#define ARCXCNN_CMD 0x00 /* Command Register */
#define ARCXCNN_CMD_STDBY 0x80 /* I2C Standby */
#define ARCXCNN_CMD_RESET 0x40 /* Reset */
#define ARCXCNN_CMD_BOOST 0x10 /* Boost */
#define ARCXCNN_CMD_OVP_MASK 0x0C /* --- Over Voltage Threshold */
#define ARCXCNN_CMD_OVP_XXV 0x0C /* <rsvrd> Over Voltage Threshold */
#define ARCXCNN_CMD_OVP_20V 0x08 /* 20v Over Voltage Threshold */
#define ARCXCNN_CMD_OVP_24V 0x04 /* 24v Over Voltage Threshold */
#define ARCXCNN_CMD_OVP_31V 0x00 /* 31.4v Over Voltage Threshold */
#define ARCXCNN_CMD_EXT_COMP 0x01 /* part (0) or full (1) ext. comp */
#define ARCXCNN_CONFIG 0x01 /* Configuration */
#define ARCXCNN_STATUS1 0x02 /* Status 1 */
#define ARCXCNN_STATUS2 0x03 /* Status 2 */
#define ARCXCNN_FADECTRL 0x04 /* Fading Control */
#define ARCXCNN_ILED_CONFIG 0x05 /* ILED Configuration */
#define ARCXCNN_ILED_DIM_PWM 0x00 /* config dim mode pwm */
#define ARCXCNN_ILED_DIM_INT 0x04 /* config dim mode internal */
#define ARCXCNN_LEDEN 0x06 /* LED Enable Register */
#define ARCXCNN_LEDEN_ISETEXT 0x80 /* Full-scale current set extern */
#define ARCXCNN_LEDEN_MASK 0x3F /* LED string enables mask */
#define ARCXCNN_LEDEN_BITS 0x06 /* Bits of LED string enables */
#define ARCXCNN_LEDEN_LED1 0x01
#define ARCXCNN_LEDEN_LED2 0x02
#define ARCXCNN_LEDEN_LED3 0x04
#define ARCXCNN_LEDEN_LED4 0x08
#define ARCXCNN_LEDEN_LED5 0x10
#define ARCXCNN_LEDEN_LED6 0x20
#define ARCXCNN_WLED_ISET_LSB 0x07 /* LED ISET LSB (in upper nibble) */
#define ARCXCNN_WLED_ISET_LSB_SHIFT 0x04 /* ISET LSB Left Shift */
#define ARCXCNN_WLED_ISET_MSB 0x08 /* LED ISET MSB (8 bits) */
#define ARCXCNN_DIMFREQ 0x09
#define ARCXCNN_COMP_CONFIG 0x0A
#define ARCXCNN_FILT_CONFIG 0x0B
#define ARCXCNN_IMAXTUNE 0x0C
#define ARCXCNN_ID_MSB 0x1E
#define ARCXCNN_ID_LSB 0x1F
#define MAX_BRIGHTNESS 4095
#define INIT_BRIGHT 60
struct arcxcnn {
struct i2c_client *client;
struct backlight_device *bl;
struct device *dev;
struct arcxcnn_platform_data *pdata;
};
static int arcxcnn_update_field(struct arcxcnn *lp, u8 reg, u8 mask, u8 data)
{
int ret;
u8 tmp;
ret = i2c_smbus_read_byte_data(lp->client, reg);
if (ret < 0) {
dev_err(lp->dev, "failed to read 0x%.2x\n", reg);
return ret;
}
tmp = (u8)ret;
tmp &= ~mask;
tmp |= data & mask;
return i2c_smbus_write_byte_data(lp->client, reg, tmp);
}
static int arcxcnn_set_brightness(struct arcxcnn *lp, u32 brightness)
{
int ret;
u8 val;
/* lower nibble of brightness goes in upper nibble of LSB register */
val = (brightness & 0xF) << ARCXCNN_WLED_ISET_LSB_SHIFT;
ret = i2c_smbus_write_byte_data(lp->client,
ARCXCNN_WLED_ISET_LSB, val);
if (ret < 0)
return ret;
/* remaining 8 bits of brightness go in MSB register */
val = (brightness >> 4);
return i2c_smbus_write_byte_data(lp->client,
ARCXCNN_WLED_ISET_MSB, val);
}
static int arcxcnn_bl_update_status(struct backlight_device *bl)
{
struct arcxcnn *lp = bl_get_data(bl);
u32 brightness = backlight_get_brightness(bl);
int ret;
ret = arcxcnn_set_brightness(lp, brightness);
if (ret)
return ret;
/* set power-on/off/save modes */
return arcxcnn_update_field(lp, ARCXCNN_CMD, ARCXCNN_CMD_STDBY,
(bl->props.power == 0) ? 0 : ARCXCNN_CMD_STDBY);
}
static const struct backlight_ops arcxcnn_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = arcxcnn_bl_update_status,
};
static int arcxcnn_backlight_register(struct arcxcnn *lp)
{
struct backlight_properties *props;
const char *name = lp->pdata->name ? : "arctic_bl";
props = devm_kzalloc(lp->dev, sizeof(*props), GFP_KERNEL);
if (!props)
return -ENOMEM;
props->type = BACKLIGHT_PLATFORM;
props->max_brightness = MAX_BRIGHTNESS;
if (lp->pdata->initial_brightness > props->max_brightness)
lp->pdata->initial_brightness = props->max_brightness;
props->brightness = lp->pdata->initial_brightness;
lp->bl = devm_backlight_device_register(lp->dev, name, lp->dev, lp,
&arcxcnn_bl_ops, props);
return PTR_ERR_OR_ZERO(lp->bl);
}
static void arcxcnn_parse_dt(struct arcxcnn *lp)
{
struct device *dev = lp->dev;
struct device_node *node = dev->of_node;
u32 prog_val, num_entry, entry, sources[ARCXCNN_LEDEN_BITS];
int ret;
/* device tree entry isn't required, defaults are OK */
if (!node)
return;
ret = of_property_read_string(node, "label", &lp->pdata->name);
if (ret < 0)
lp->pdata->name = NULL;
ret = of_property_read_u32(node, "default-brightness", &prog_val);
if (ret == 0)
lp->pdata->initial_brightness = prog_val;
ret = of_property_read_u32(node, "arc,led-config-0", &prog_val);
if (ret == 0)
lp->pdata->led_config_0 = (u8)prog_val;
ret = of_property_read_u32(node, "arc,led-config-1", &prog_val);
if (ret == 0)
lp->pdata->led_config_1 = (u8)prog_val;
ret = of_property_read_u32(node, "arc,dim-freq", &prog_val);
if (ret == 0)
lp->pdata->dim_freq = (u8)prog_val;
ret = of_property_read_u32(node, "arc,comp-config", &prog_val);
if (ret == 0)
lp->pdata->comp_config = (u8)prog_val;
ret = of_property_read_u32(node, "arc,filter-config", &prog_val);
if (ret == 0)
lp->pdata->filter_config = (u8)prog_val;
ret = of_property_read_u32(node, "arc,trim-config", &prog_val);
if (ret == 0)
lp->pdata->trim_config = (u8)prog_val;
ret = of_property_count_u32_elems(node, "led-sources");
if (ret < 0) {
lp->pdata->leden = ARCXCNN_LEDEN_MASK; /* all on is default */
} else {
num_entry = ret;
if (num_entry > ARCXCNN_LEDEN_BITS)
num_entry = ARCXCNN_LEDEN_BITS;
ret = of_property_read_u32_array(node, "led-sources", sources,
num_entry);
if (ret < 0) {
dev_err(dev, "led-sources node is invalid.\n");
return;
}
lp->pdata->leden = 0;
/* for each enable in source, set bit in led enable */
for (entry = 0; entry < num_entry; entry++) {
u8 onbit = 1 << sources[entry];
lp->pdata->leden |= onbit;
}
}
}
static int arcxcnn_probe(struct i2c_client *cl)
{
struct arcxcnn *lp;
int ret;
if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -EIO;
lp = devm_kzalloc(&cl->dev, sizeof(*lp), GFP_KERNEL);
if (!lp)
return -ENOMEM;
lp->client = cl;
lp->dev = &cl->dev;
lp->pdata = dev_get_platdata(&cl->dev);
/* reset the device */
ret = i2c_smbus_write_byte_data(lp->client,
ARCXCNN_CMD, ARCXCNN_CMD_RESET);
if (ret)
goto probe_err;
if (!lp->pdata) {
lp->pdata = devm_kzalloc(lp->dev,
sizeof(*lp->pdata), GFP_KERNEL);
if (!lp->pdata)
return -ENOMEM;
/* Setup defaults based on power-on defaults */
lp->pdata->name = NULL;
lp->pdata->initial_brightness = INIT_BRIGHT;
lp->pdata->leden = ARCXCNN_LEDEN_MASK;
lp->pdata->led_config_0 = i2c_smbus_read_byte_data(
lp->client, ARCXCNN_FADECTRL);
lp->pdata->led_config_1 = i2c_smbus_read_byte_data(
lp->client, ARCXCNN_ILED_CONFIG);
/* insure dim mode is not default pwm */
lp->pdata->led_config_1 |= ARCXCNN_ILED_DIM_INT;
lp->pdata->dim_freq = i2c_smbus_read_byte_data(
lp->client, ARCXCNN_DIMFREQ);
lp->pdata->comp_config = i2c_smbus_read_byte_data(
lp->client, ARCXCNN_COMP_CONFIG);
lp->pdata->filter_config = i2c_smbus_read_byte_data(
lp->client, ARCXCNN_FILT_CONFIG);
lp->pdata->trim_config = i2c_smbus_read_byte_data(
lp->client, ARCXCNN_IMAXTUNE);
if (IS_ENABLED(CONFIG_OF))
arcxcnn_parse_dt(lp);
}
i2c_set_clientdata(cl, lp);
/* constrain settings to what is possible */
if (lp->pdata->initial_brightness > MAX_BRIGHTNESS)
lp->pdata->initial_brightness = MAX_BRIGHTNESS;
/* set initial brightness */
ret = arcxcnn_set_brightness(lp, lp->pdata->initial_brightness);
if (ret)
goto probe_err;
/* set other register values directly */
ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_FADECTRL,
lp->pdata->led_config_0);
if (ret)
goto probe_err;
ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_ILED_CONFIG,
lp->pdata->led_config_1);
if (ret)
goto probe_err;
ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_DIMFREQ,
lp->pdata->dim_freq);
if (ret)
goto probe_err;
ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_COMP_CONFIG,
lp->pdata->comp_config);
if (ret)
goto probe_err;
ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_FILT_CONFIG,
lp->pdata->filter_config);
if (ret)
goto probe_err;
ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_IMAXTUNE,
lp->pdata->trim_config);
if (ret)
goto probe_err;
/* set initial LED Enables */
arcxcnn_update_field(lp, ARCXCNN_LEDEN,
ARCXCNN_LEDEN_MASK, lp->pdata->leden);
ret = arcxcnn_backlight_register(lp);
if (ret)
goto probe_register_err;
backlight_update_status(lp->bl);
return 0;
probe_register_err:
dev_err(lp->dev,
"failed to register backlight.\n");
probe_err:
dev_err(lp->dev,
"failure ret: %d\n", ret);
return ret;
}
static void arcxcnn_remove(struct i2c_client *cl)
{
struct arcxcnn *lp = i2c_get_clientdata(cl);
/* disable all strings (ignore errors) */
i2c_smbus_write_byte_data(lp->client,
ARCXCNN_LEDEN, 0x00);
/* reset the device (ignore errors) */
i2c_smbus_write_byte_data(lp->client,
ARCXCNN_CMD, ARCXCNN_CMD_RESET);
lp->bl->props.brightness = 0;
backlight_update_status(lp->bl);
}
static const struct of_device_id arcxcnn_dt_ids[] = {
{ .compatible = "arc,arc2c0608" },
{ }
};
MODULE_DEVICE_TABLE(of, arcxcnn_dt_ids);
static const struct i2c_device_id arcxcnn_ids[] = {
{"arc2c0608", ARC2C0608},
{ }
};
MODULE_DEVICE_TABLE(i2c, arcxcnn_ids);
static struct i2c_driver arcxcnn_driver = {
.driver = {
.name = "arcxcnn_bl",
.of_match_table = arcxcnn_dt_ids,
},
.probe = arcxcnn_probe,
.remove = arcxcnn_remove,
.id_table = arcxcnn_ids,
};
module_i2c_driver(arcxcnn_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Brian Dodge <[email protected]>");
MODULE_DESCRIPTION("ARCXCNN Backlight driver");
| linux-master | drivers/video/backlight/arcxcnn_bl.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) Intel Corp. 2007.
* All Rights Reserved.
*
* Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
* develop this driver.
*
* This file is part of the Carillo Ranch video subsystem driver.
*
* Authors:
* Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
* Alan Hourihane <alanh-at-tungstengraphics-dot-com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/lcd.h>
#include <linux/pci.h>
#include <linux/slab.h>
/* The LVDS- and panel power controls sits on the
* GPIO port of the ISA bridge.
*/
#define CRVML_DEVICE_LPC 0x27B8
#define CRVML_REG_GPIOBAR 0x48
#define CRVML_REG_GPIOEN 0x4C
#define CRVML_GPIOEN_BIT (1 << 4)
#define CRVML_PANEL_PORT 0x38
#define CRVML_LVDS_ON 0x00000001
#define CRVML_PANEL_ON 0x00000002
#define CRVML_BACKLIGHT_OFF 0x00000004
/* The PLL Clock register sits on Host bridge */
#define CRVML_DEVICE_MCH 0x5001
#define CRVML_REG_MCHBAR 0x44
#define CRVML_REG_MCHEN 0x54
#define CRVML_MCHEN_BIT (1 << 28)
#define CRVML_MCHMAP_SIZE 4096
#define CRVML_REG_CLOCK 0xc3c
#define CRVML_CLOCK_SHIFT 8
#define CRVML_CLOCK_MASK 0x00000f00
static struct pci_dev *lpc_dev;
static u32 gpio_bar;
struct cr_panel {
struct backlight_device *cr_backlight_device;
struct lcd_device *cr_lcd_device;
};
static int cr_backlight_set_intensity(struct backlight_device *bd)
{
u32 addr = gpio_bar + CRVML_PANEL_PORT;
u32 cur = inl(addr);
if (backlight_get_brightness(bd) == 0) {
/* OFF */
cur |= CRVML_BACKLIGHT_OFF;
outl(cur, addr);
} else {
/* FULL ON */
cur &= ~CRVML_BACKLIGHT_OFF;
outl(cur, addr);
}
return 0;
}
static int cr_backlight_get_intensity(struct backlight_device *bd)
{
u32 addr = gpio_bar + CRVML_PANEL_PORT;
u32 cur = inl(addr);
u8 intensity;
if (cur & CRVML_BACKLIGHT_OFF)
intensity = 0;
else
intensity = 1;
return intensity;
}
static const struct backlight_ops cr_backlight_ops = {
.get_brightness = cr_backlight_get_intensity,
.update_status = cr_backlight_set_intensity,
};
static void cr_panel_on(void)
{
u32 addr = gpio_bar + CRVML_PANEL_PORT;
u32 cur = inl(addr);
if (!(cur & CRVML_PANEL_ON)) {
/* Make sure LVDS controller is down. */
if (cur & 0x00000001) {
cur &= ~CRVML_LVDS_ON;
outl(cur, addr);
}
/* Power up Panel */
schedule_timeout(HZ / 10);
cur |= CRVML_PANEL_ON;
outl(cur, addr);
}
/* Power up LVDS controller */
if (!(cur & CRVML_LVDS_ON)) {
schedule_timeout(HZ / 10);
outl(cur | CRVML_LVDS_ON, addr);
}
}
static void cr_panel_off(void)
{
u32 addr = gpio_bar + CRVML_PANEL_PORT;
u32 cur = inl(addr);
/* Power down LVDS controller first to avoid high currents */
if (cur & CRVML_LVDS_ON) {
cur &= ~CRVML_LVDS_ON;
outl(cur, addr);
}
if (cur & CRVML_PANEL_ON) {
schedule_timeout(HZ / 10);
outl(cur & ~CRVML_PANEL_ON, addr);
}
}
static int cr_lcd_set_power(struct lcd_device *ld, int power)
{
if (power == FB_BLANK_UNBLANK)
cr_panel_on();
if (power == FB_BLANK_POWERDOWN)
cr_panel_off();
return 0;
}
static struct lcd_ops cr_lcd_ops = {
.set_power = cr_lcd_set_power,
};
static int cr_backlight_probe(struct platform_device *pdev)
{
struct backlight_properties props;
struct backlight_device *bdp;
struct lcd_device *ldp;
struct cr_panel *crp;
u8 dev_en;
lpc_dev = pci_get_device(PCI_VENDOR_ID_INTEL,
CRVML_DEVICE_LPC, NULL);
if (!lpc_dev) {
pr_err("INTEL CARILLO RANCH LPC not found.\n");
return -ENODEV;
}
pci_read_config_byte(lpc_dev, CRVML_REG_GPIOEN, &dev_en);
if (!(dev_en & CRVML_GPIOEN_BIT)) {
pr_err("Carillo Ranch GPIO device was not enabled.\n");
pci_dev_put(lpc_dev);
return -ENODEV;
}
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
bdp = devm_backlight_device_register(&pdev->dev, "cr-backlight",
&pdev->dev, NULL, &cr_backlight_ops,
&props);
if (IS_ERR(bdp)) {
pci_dev_put(lpc_dev);
return PTR_ERR(bdp);
}
ldp = devm_lcd_device_register(&pdev->dev, "cr-lcd", &pdev->dev, NULL,
&cr_lcd_ops);
if (IS_ERR(ldp)) {
pci_dev_put(lpc_dev);
return PTR_ERR(ldp);
}
pci_read_config_dword(lpc_dev, CRVML_REG_GPIOBAR,
&gpio_bar);
gpio_bar &= ~0x3F;
crp = devm_kzalloc(&pdev->dev, sizeof(*crp), GFP_KERNEL);
if (!crp) {
pci_dev_put(lpc_dev);
return -ENOMEM;
}
crp->cr_backlight_device = bdp;
crp->cr_lcd_device = ldp;
crp->cr_backlight_device->props.power = FB_BLANK_UNBLANK;
crp->cr_backlight_device->props.brightness = 0;
cr_backlight_set_intensity(crp->cr_backlight_device);
cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_UNBLANK);
platform_set_drvdata(pdev, crp);
return 0;
}
static void cr_backlight_remove(struct platform_device *pdev)
{
struct cr_panel *crp = platform_get_drvdata(pdev);
crp->cr_backlight_device->props.power = FB_BLANK_POWERDOWN;
crp->cr_backlight_device->props.brightness = 0;
crp->cr_backlight_device->props.max_brightness = 0;
cr_backlight_set_intensity(crp->cr_backlight_device);
cr_lcd_set_power(crp->cr_lcd_device, FB_BLANK_POWERDOWN);
pci_dev_put(lpc_dev);
}
static struct platform_driver cr_backlight_driver = {
.probe = cr_backlight_probe,
.remove_new = cr_backlight_remove,
.driver = {
.name = "cr_backlight",
},
};
static struct platform_device *crp;
static int __init cr_backlight_init(void)
{
int ret = platform_driver_register(&cr_backlight_driver);
if (ret)
return ret;
crp = platform_device_register_simple("cr_backlight", -1, NULL, 0);
if (IS_ERR(crp)) {
platform_driver_unregister(&cr_backlight_driver);
return PTR_ERR(crp);
}
pr_info("Carillo Ranch Backlight Driver Initialized.\n");
return 0;
}
static void __exit cr_backlight_exit(void)
{
platform_device_unregister(crp);
platform_driver_unregister(&cr_backlight_driver);
}
module_init(cr_backlight_init);
module_exit(cr_backlight_exit);
MODULE_AUTHOR("Tungsten Graphics Inc.");
MODULE_DESCRIPTION("Carillo Ranch Backlight Driver");
MODULE_LICENSE("GPL");
| linux-master | drivers/video/backlight/cr_bllcd.c |
// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* LCD driver for HP Jornada 700 series (710/720/728)
* Copyright (C) 2006-2009 Kristoffer Ericson <[email protected]>
*/
#include <linux/device.h>
#include <linux/fb.h>
#include <linux/kernel.h>
#include <linux/lcd.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <mach/jornada720.h>
#include <mach/hardware.h>
#include <video/s1d13xxxfb.h>
#define LCD_MAX_CONTRAST 0xff
#define LCD_DEF_CONTRAST 0x80
static int jornada_lcd_get_power(struct lcd_device *ld)
{
return PPSR & PPC_LDD2 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
}
static int jornada_lcd_get_contrast(struct lcd_device *ld)
{
int ret;
if (jornada_lcd_get_power(ld) != FB_BLANK_UNBLANK)
return 0;
jornada_ssp_start();
if (jornada_ssp_byte(GETCONTRAST) == TXDUMMY) {
ret = jornada_ssp_byte(TXDUMMY);
goto success;
}
dev_err(&ld->dev, "failed to set contrast\n");
ret = -ETIMEDOUT;
success:
jornada_ssp_end();
return ret;
}
static int jornada_lcd_set_contrast(struct lcd_device *ld, int value)
{
int ret = 0;
jornada_ssp_start();
/* start by sending our set contrast cmd to mcu */
if (jornada_ssp_byte(SETCONTRAST) == TXDUMMY) {
/* if successful push the new value */
if (jornada_ssp_byte(value) == TXDUMMY)
goto success;
}
dev_err(&ld->dev, "failed to set contrast\n");
ret = -ETIMEDOUT;
success:
jornada_ssp_end();
return ret;
}
static int jornada_lcd_set_power(struct lcd_device *ld, int power)
{
if (power != FB_BLANK_UNBLANK) {
PPSR &= ~PPC_LDD2;
PPDR |= PPC_LDD2;
} else {
PPSR |= PPC_LDD2;
}
return 0;
}
static struct lcd_ops jornada_lcd_props = {
.get_contrast = jornada_lcd_get_contrast,
.set_contrast = jornada_lcd_set_contrast,
.get_power = jornada_lcd_get_power,
.set_power = jornada_lcd_set_power,
};
static int jornada_lcd_probe(struct platform_device *pdev)
{
struct lcd_device *lcd_device;
int ret;
lcd_device = devm_lcd_device_register(&pdev->dev, S1D_DEVICENAME,
&pdev->dev, NULL, &jornada_lcd_props);
if (IS_ERR(lcd_device)) {
ret = PTR_ERR(lcd_device);
dev_err(&pdev->dev, "failed to register device\n");
return ret;
}
platform_set_drvdata(pdev, lcd_device);
/* lets set our default values */
jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
/* give it some time to startup */
msleep(100);
return 0;
}
static struct platform_driver jornada_lcd_driver = {
.probe = jornada_lcd_probe,
.driver = {
.name = "jornada_lcd",
},
};
module_platform_driver(jornada_lcd_driver);
MODULE_AUTHOR("Kristoffer Ericson <[email protected]>");
MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
MODULE_LICENSE("GPL");
| linux-master | drivers/video/backlight/jornada720_lcd.c |
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