text: /*
   * RapidIO sysfs attributes and support
   *
   * Copyright 2005 MontaVista Software, Inc.
   * Matt Porter <mporter@kernel.crashing.org>
   *
   * This program is free software; you can redistribute  it and/or modify it
   * under  the terms of  the GNU General  Public License as published by the
   * Free Software Foundation;  either version 2 of the  License, or (at your
   * option) any later version.
   */
  
  #include <linux/kernel.h>
  #include <linux/rio.h>
  #include <linux/rio_drv.h>
  #include <linux/stat.h>
  #include <linux/capability.h>
  
  #include "rio.h"
  
  /* Sysfs support */
  #define rio_config_attr(field, format_string)					\
  static ssize_t								\
  field##_show(struct device *dev, struct device_attribute *attr, char *buf)			\
  {									\
  	struct rio_dev *rdev = to_rio_dev(dev);				\
  									\
  	return sprintf(buf, format_string, rdev->field);		\
  }									\
  
  rio_config_attr(did, "0x%04x\n");
  rio_config_attr(vid, "0x%04x\n");
  rio_config_attr(device_rev, "0x%08x\n");
  rio_config_attr(asm_did, "0x%04x\n");
  rio_config_attr(asm_vid, "0x%04x\n");
  rio_config_attr(asm_rev, "0x%04x\n");
  rio_config_attr(destid, "0x%04x\n");
  rio_config_attr(hopcount, "0x%02x\n");
  
  static ssize_t routes_show(struct device *dev, struct device_attribute *attr, char *buf)
  {
  	struct rio_dev *rdev = to_rio_dev(dev);
  	char *str = buf;
  	int i;
  
  	for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
  			i++) {
  		if (rdev->rswitch->route_table[i] == RIO_INVALID_ROUTE)
  			continue;
  		str +=
  		    sprintf(str, "%04x %02x\n", i,
  			    rdev->rswitch->route_table[i]);
  	}
  
  	return (str - buf);
  }
  
  static ssize_t lprev_show(struct device *dev,
  			  struct device_attribute *attr, char *buf)
  {
  	struct rio_dev *rdev = to_rio_dev(dev);
  
  	return sprintf(buf, "%s\n",
  			(rdev->prev) ? rio_name(rdev->prev) : "root");
  }
  
  static ssize_t lnext_show(struct device *dev,
  			  struct device_attribute *attr, char *buf)
  {
  	struct rio_dev *rdev = to_rio_dev(dev);
  	char *str = buf;
  	int i;
  
  	if (rdev->pef & RIO_PEF_SWITCH) {
  		for (i = 0; i < RIO_GET_TOTAL_PORTS(rdev->swpinfo); i++) {
  			if (rdev->rswitch->nextdev[i])
  				str += sprintf(str, "%s\n",
  					rio_name(rdev->rswitch->nextdev[i]));
  			else
  				str += sprintf(str, "null\n");
  		}
  	}
  
  	return str - buf;
  }
  
  struct device_attribute rio_dev_attrs[] = {
  	__ATTR_RO(did),
  	__ATTR_RO(vid),
  	__ATTR_RO(device_rev),
  	__ATTR_RO(asm_did),
  	__ATTR_RO(asm_vid),
  	__ATTR_RO(asm_rev),
  	__ATTR_RO(lprev),
  	__ATTR_RO(destid),
  	__ATTR_NULL,
  };
  
  static DEVICE_ATTR(routes, S_IRUGO, routes_show, NULL);
  static DEVICE_ATTR(lnext, S_IRUGO, lnext_show, NULL);
  static DEVICE_ATTR(hopcount, S_IRUGO, hopcount_show, NULL);
  
  static ssize_t
  rio_read_config(struct file *filp, struct kobject *kobj,
  		struct bin_attribute *bin_attr,
  		char *buf, loff_t off, size_t count)
  {
  	struct rio_dev *dev =
  	    to_rio_dev(container_of(kobj, struct device, kobj));
  	unsigned int size = 0x100;
  	loff_t init_off = off;
  	u8 *data = (u8 *) buf;
  
  	/* Several chips lock up trying to read undefined config space */
  	if (capable(CAP_SYS_ADMIN))
  		size = RIO_MAINT_SPACE_SZ;
  
  	if (off >= size)
  		return 0;
  	if (off + count > size) {
  		size -= off;
  		count = size;
  	} else {
  		size = count;
  	}
  
  	if ((off & 1) && size) {
  		u8 val;
  		rio_read_config_8(dev, off, &val);
  		data[off - init_off] = val;
  		off++;
  		size--;
  	}
  
  	if ((off & 3) && size > 2) {
  		u16 val;
  		rio_read_config_16(dev, off, &val);
  		data[off - init_off] = (val >> 8) & 0xff;
  		data[off - init_off + 1] = val & 0xff;
  		off += 2;
  		size -= 2;
  	}
  
  	while (size > 3) {
  		u32 val;
  		rio_read_config_32(dev, off, &val);
  		data[off - init_off] = (val >> 24) & 0xff;
  		data[off - init_off + 1] = (val >> 16) & 0xff;
  		data[off - init_off + 2] = (val >> 8) & 0xff;
  		data[off - init_off + 3] = val & 0xff;
  		off += 4;
  		size -= 4;
  	}
  
  	if (size >= 2) {
  		u16 val;
  		rio_read_config_16(dev, off, &val);
  		data[off - init_off] = (val >> 8) & 0xff;
  		data[off - init_off + 1] = val & 0xff;
  		off += 2;
  		size -= 2;
  	}
  
  	if (size > 0) {
  		u8 val;
  		rio_read_config_8(dev, off, &val);
  		data[off - init_off] = val;
  		off++;
  		--size;
  	}
  
  	return count;
  }
  
  static ssize_t
  rio_write_config(struct file *filp, struct kobject *kobj,
  		 struct bin_attribute *bin_attr,
  		 char *buf, loff_t off, size_t count)
  {
  	struct rio_dev *dev =
  	    to_rio_dev(container_of(kobj, struct device, kobj));
  	unsigned int size = count;
  	loff_t init_off = off;
  	u8 *data = (u8 *) buf;
  
  	if (off >= RIO_MAINT_SPACE_SZ)
  		return 0;
  	if (off + count > RIO_MAINT_SPACE_SZ) {
  		size = RIO_MAINT_SPACE_SZ - off;
  		count = size;
  	}
  
  	if ((off & 1) && size) {
  		rio_write_config_8(dev, off, data[off - init_off]);
  		off++;
  		size--;
  	}
  
  	if ((off & 3) && (size > 2)) {
  		u16 val = data[off - init_off + 1];
  		val |= (u16) data[off - init_off] << 8;
  		rio_write_config_16(dev, off, val);
  		off += 2;
  		size -= 2;
  	}
  
  	while (size > 3) {
  		u32 val = data[off - init_off + 3];
  		val |= (u32) data[off - init_off + 2] << 8;
  		val |= (u32) data[off - init_off + 1] << 16;
  		val |= (u32) data[off - init_off] << 24;
  		rio_write_config_32(dev, off, val);
  		off += 4;
  		size -= 4;
  	}
  
  	if (size >= 2) {
  		u16 val = data[off - init_off + 1];
  		val |= (u16) data[off - init_off] << 8;
  		rio_write_config_16(dev, off, val);
  		off += 2;
  		size -= 2;
  	}
  
  	if (size) {
  		rio_write_config_8(dev, off, data[off - init_off]);
  		off++;
  		--size;
  	}
  
  	return count;
  }
  
  static struct bin_attribute rio_config_attr = {
  	.attr = {
  		 .name = "config",
  		 .mode = S_IRUGO | S_IWUSR,
  		 },
  	.size = RIO_MAINT_SPACE_SZ,
  	.read = rio_read_config,
  	.write = rio_write_config,
  };
  
  /**
   * rio_create_sysfs_dev_files - create RIO specific sysfs files
   * @rdev: device whose entries should be created
   *
   * Create files when @rdev is added to sysfs.
   */
  int rio_create_sysfs_dev_files(struct rio_dev *rdev)
  {
  	int err = 0;
  
  	err = device_create_bin_file(&rdev->dev, &rio_config_attr);
  
  	if (!err && (rdev->pef & RIO_PEF_SWITCH)) {
  		err |= device_create_file(&rdev->dev, &dev_attr_routes);
  		err |= device_create_file(&rdev->dev, &dev_attr_lnext);
  		err |= device_create_file(&rdev->dev, &dev_attr_hopcount);
  		if (!err && rdev->rswitch->sw_sysfs)
  			err = rdev->rswitch->sw_sysfs(rdev, RIO_SW_SYSFS_CREATE);
  	}
  
  	if (err)
  		pr_warning("RIO: Failed to create attribute file(s) for %s\n",
  			   rio_name(rdev));
  
  	return err;
  }
  
  /**
   * rio_remove_sysfs_dev_files - cleanup RIO specific sysfs files
   * @rdev: device whose entries we should free
   *
   * Cleanup when @rdev is removed from sysfs.
   */
  void rio_remove_sysfs_dev_files(struct rio_dev *rdev)
  {
  	device_remove_bin_file(&rdev->dev, &rio_config_attr);
  	if (rdev->pef & RIO_PEF_SWITCH) {
  		device_remove_file(&rdev->dev, &dev_attr_routes);
  		device_remove_file(&rdev->dev, &dev_attr_lnext);
  		device_remove_file(&rdev->dev, &dev_attr_hopcount);
  		if (rdev->rswitch->sw_sysfs)
  			rdev->rswitch->sw_sysfs(rdev, RIO_SW_SYSFS_REMOVE);
  	}
  }
  
  static ssize_t bus_scan_store(struct bus_type *bus, const char *buf,
  				size_t count)
  {
  	long val;
  	struct rio_mport *port = NULL;
  	int rc;
  
  	if (kstrtol(buf, 0, &val) < 0)
  		return -EINVAL;
  
  	if (val == RIO_MPORT_ANY) {
  		rc = rio_init_mports();
  		goto exit;
  	}
  
  	if (val < 0 || val >= RIO_MAX_MPORTS)
  		return -EINVAL;
  
  	port = rio_find_mport((int)val);
  
  	if (!port) {
  		pr_debug("RIO: %s: mport_%d not available\n",
  			 __func__, (int)val);
  		return -EINVAL;
  	}
  
  	if (!port->nscan)
  		return -EINVAL;
  
  	if (port->host_deviceid >= 0)
  		rc = port->nscan->enumerate(port, 0);
  	else
  		rc = port->nscan->discover(port, RIO_SCAN_ENUM_NO_WAIT);
  exit:
  	if (!rc)
  		rc = count;
  
  	return rc;
  }
  
  struct bus_attribute rio_bus_attrs[] = {
  	__ATTR(scan, (S_IWUSR|S_IWGRP), NULL, bus_scan_store),
  	__ATTR_NULL
  };
  