text: /*
   *  ideapad-laptop.c - Lenovo IdeaPad ACPI Extras
   *
   *  Copyright © 2010 Intel Corporation
   *  Copyright © 2010 David Woodhouse <dwmw2@infradead.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.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *  along with this program; if not, write to the Free Software
   *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   *  02110-1301, USA.
   */
  
  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/types.h>
  #include <linux/acpi.h>
  #include <linux/rfkill.h>
  #include <linux/platform_device.h>
  #include <linux/input.h>
  #include <linux/input/sparse-keymap.h>
  #include <linux/backlight.h>
  #include <linux/fb.h>
  #include <linux/debugfs.h>
  #include <linux/seq_file.h>
  #include <linux/i8042.h>
  #include <linux/dmi.h>
  #include <linux/device.h>
  #include <acpi/video.h>
  
  #define IDEAPAD_RFKILL_DEV_NUM	(3)
  
  #define CFG_BT_BIT	(16)
  #define CFG_3G_BIT	(17)
  #define CFG_WIFI_BIT	(18)
  #define CFG_CAMERA_BIT	(19)
  
  #if IS_ENABLED(CONFIG_ACPI_WMI)
  static const char *const ideapad_wmi_fnesc_events[] = {
  	"26CAB2E5-5CF1-46AE-AAC3-4A12B6BA50E6", /* Yoga 3 */
  	"56322276-8493-4CE8-A783-98C991274F5E", /* Yoga 700 */
  };
  #endif
  
  enum {
  	VPCCMD_R_VPC1 = 0x10,
  	VPCCMD_R_BL_MAX,
  	VPCCMD_R_BL,
  	VPCCMD_W_BL,
  	VPCCMD_R_WIFI,
  	VPCCMD_W_WIFI,
  	VPCCMD_R_BT,
  	VPCCMD_W_BT,
  	VPCCMD_R_BL_POWER,
  	VPCCMD_R_NOVO,
  	VPCCMD_R_VPC2,
  	VPCCMD_R_TOUCHPAD,
  	VPCCMD_W_TOUCHPAD,
  	VPCCMD_R_CAMERA,
  	VPCCMD_W_CAMERA,
  	VPCCMD_R_3G,
  	VPCCMD_W_3G,
  	VPCCMD_R_ODD, /* 0x21 */
  	VPCCMD_W_FAN,
  	VPCCMD_R_RF,
  	VPCCMD_W_RF,
  	VPCCMD_R_FAN = 0x2B,
  	VPCCMD_R_SPECIAL_BUTTONS = 0x31,
  	VPCCMD_W_BL_POWER = 0x33,
  };
  
  struct ideapad_rfk_priv {
  	int dev;
  	struct ideapad_private *priv;
  };
  
  struct ideapad_private {
  	struct acpi_device *adev;
  	struct rfkill *rfk[IDEAPAD_RFKILL_DEV_NUM];
  	struct ideapad_rfk_priv rfk_priv[IDEAPAD_RFKILL_DEV_NUM];
  	struct platform_device *platform_device;
  	struct input_dev *inputdev;
  	struct backlight_device *blightdev;
  	struct dentry *debug;
  	unsigned long cfg;
  	bool has_hw_rfkill_switch;
  	const char *fnesc_guid;
  };
  
  static bool no_bt_rfkill;
  module_param(no_bt_rfkill, bool, 0444);
  MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");
  
  /*
   * ACPI Helpers
   */
  #define IDEAPAD_EC_TIMEOUT (100) /* in ms */
  
  static int read_method_int(acpi_handle handle, const char *method, int *val)
  {
  	acpi_status status;
  	unsigned long long result;
  
  	status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
  	if (ACPI_FAILURE(status)) {
  		*val = -1;
  		return -1;
  	} else {
  		*val = result;
  		return 0;
  	}
  }
  
  static int method_vpcr(acpi_handle handle, int cmd, int *ret)
  {
  	acpi_status status;
  	unsigned long long result;
  	struct acpi_object_list params;
  	union acpi_object in_obj;
  
  	params.count = 1;
  	params.pointer = &in_obj;
  	in_obj.type = ACPI_TYPE_INTEGER;
  	in_obj.integer.value = cmd;
  
  	status = acpi_evaluate_integer(handle, "VPCR", &params, &result);
  
  	if (ACPI_FAILURE(status)) {
  		*ret = -1;
  		return -1;
  	} else {
  		*ret = result;
  		return 0;
  	}
  }
  
  static int method_vpcw(acpi_handle handle, int cmd, int data)
  {
  	struct acpi_object_list params;
  	union acpi_object in_obj[2];
  	acpi_status status;
  
  	params.count = 2;
  	params.pointer = in_obj;
  	in_obj[0].type = ACPI_TYPE_INTEGER;
  	in_obj[0].integer.value = cmd;
  	in_obj[1].type = ACPI_TYPE_INTEGER;
  	in_obj[1].integer.value = data;
  
  	status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
  	if (status != AE_OK)
  		return -1;
  	return 0;
  }
  
  static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
  {
  	int val;
  	unsigned long int end_jiffies;
  
  	if (method_vpcw(handle, 1, cmd))
  		return -1;
  
  	for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
  	     time_before(jiffies, end_jiffies);) {
  		schedule();
  		if (method_vpcr(handle, 1, &val))
  			return -1;
  		if (val == 0) {
  			if (method_vpcr(handle, 0, &val))
  				return -1;
  			*data = val;
  			return 0;
  		}
  	}
  	pr_err("timeout in read_ec_cmd\n");
  	return -1;
  }
  
  static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
  {
  	int val;
  	unsigned long int end_jiffies;
  
  	if (method_vpcw(handle, 0, data))
  		return -1;
  	if (method_vpcw(handle, 1, cmd))
  		return -1;
  
  	for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
  	     time_before(jiffies, end_jiffies);) {
  		schedule();
  		if (method_vpcr(handle, 1, &val))
  			return -1;
  		if (val == 0)
  			return 0;
  	}
  	pr_err("timeout in write_ec_cmd\n");
  	return -1;
  }
  
  /*
   * debugfs
   */
  static int debugfs_status_show(struct seq_file *s, void *data)
  {
  	struct ideapad_private *priv = s->private;
  	unsigned long value;
  
  	if (!priv)
  		return -EINVAL;
  
  	if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL_MAX, &value))
  		seq_printf(s, "Backlight max:\t%lu\n", value);
  	if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL, &value))
  		seq_printf(s, "Backlight now:\t%lu\n", value);
  	if (!read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &value))
  		seq_printf(s, "BL power value:\t%s\n", value ? "On" : "Off");
  	seq_printf(s, "=====================\n");
  
  	if (!read_ec_data(priv->adev->handle, VPCCMD_R_RF, &value))
  		seq_printf(s, "Radio status:\t%s(%lu)\n",
  			   value ? "On" : "Off", value);
  	if (!read_ec_data(priv->adev->handle, VPCCMD_R_WIFI, &value))
  		seq_printf(s, "Wifi status:\t%s(%lu)\n",
  			   value ? "On" : "Off", value);
  	if (!read_ec_data(priv->adev->handle, VPCCMD_R_BT, &value))
  		seq_printf(s, "BT status:\t%s(%lu)\n",
  			   value ? "On" : "Off", value);
  	if (!read_ec_data(priv->adev->handle, VPCCMD_R_3G, &value))
  		seq_printf(s, "3G status:\t%s(%lu)\n",
  			   value ? "On" : "Off", value);
  	seq_printf(s, "=====================\n");
  
  	if (!read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &value))
  		seq_printf(s, "Touchpad status:%s(%lu)\n",
  			   value ? "On" : "Off", value);
  	if (!read_ec_data(priv->adev->handle, VPCCMD_R_CAMERA, &value))
  		seq_printf(s, "Camera status:\t%s(%lu)\n",
  			   value ? "On" : "Off", value);
  
  	return 0;
  }
  
  static int debugfs_status_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, debugfs_status_show, inode->i_private);
  }
  
  static const struct file_operations debugfs_status_fops = {
  	.owner = THIS_MODULE,
  	.open = debugfs_status_open,
  	.read = seq_read,
  	.llseek = seq_lseek,
  	.release = single_release,
  };
  
  static int debugfs_cfg_show(struct seq_file *s, void *data)
  {
  	struct ideapad_private *priv = s->private;
  
  	if (!priv) {
  		seq_printf(s, "cfg: N/A\n");
  	} else {
  		seq_printf(s, "cfg: 0x%.8lX\n\nCapability: ",
  			   priv->cfg);
  		if (test_bit(CFG_BT_BIT, &priv->cfg))
  			seq_printf(s, "Bluetooth ");
  		if (test_bit(CFG_3G_BIT, &priv->cfg))
  			seq_printf(s, "3G ");
  		if (test_bit(CFG_WIFI_BIT, &priv->cfg))
  			seq_printf(s, "Wireless ");
  		if (test_bit(CFG_CAMERA_BIT, &priv->cfg))
  			seq_printf(s, "Camera ");
  		seq_printf(s, "\nGraphic: ");
  		switch ((priv->cfg)&0x700) {
  		case 0x100:
  			seq_printf(s, "Intel");
  			break;
  		case 0x200:
  			seq_printf(s, "ATI");
  			break;
  		case 0x300:
  			seq_printf(s, "Nvidia");
  			break;
  		case 0x400:
  			seq_printf(s, "Intel and ATI");
  			break;
  		case 0x500:
  			seq_printf(s, "Intel and Nvidia");
  			break;
  		}
  		seq_printf(s, "\n");
  	}
  	return 0;
  }
  
  static int debugfs_cfg_open(struct inode *inode, struct file *file)
  {
  	return single_open(file, debugfs_cfg_show, inode->i_private);
  }
  
  static const struct file_operations debugfs_cfg_fops = {
  	.owner = THIS_MODULE,
  	.open = debugfs_cfg_open,
  	.read = seq_read,
  	.llseek = seq_lseek,
  	.release = single_release,
  };
  
  static int ideapad_debugfs_init(struct ideapad_private *priv)
  {
  	struct dentry *node;
  
  	priv->debug = debugfs_create_dir("ideapad", NULL);
  	if (priv->debug == NULL) {
  		pr_err("failed to create debugfs directory");
  		goto errout;
  	}
  
  	node = debugfs_create_file("cfg", S_IRUGO, priv->debug, priv,
  				   &debugfs_cfg_fops);
  	if (!node) {
  		pr_err("failed to create cfg in debugfs");
  		goto errout;
  	}
  
  	node = debugfs_create_file("status", S_IRUGO, priv->debug, priv,
  				   &debugfs_status_fops);
  	if (!node) {
  		pr_err("failed to create status in debugfs");
  		goto errout;
  	}
  
  	return 0;
  
  errout:
  	return -ENOMEM;
  }
  
  static void ideapad_debugfs_exit(struct ideapad_private *priv)
  {
  	debugfs_remove_recursive(priv->debug);
  	priv->debug = NULL;
  }
  
  /*
   * sysfs
   */
  static ssize_t show_ideapad_cam(struct device *dev,
  				struct device_attribute *attr,
  				char *buf)
  {
  	unsigned long result;
  	struct ideapad_private *priv = dev_get_drvdata(dev);
  
  	if (read_ec_data(priv->adev->handle, VPCCMD_R_CAMERA, &result))
  		return sprintf(buf, "-1\n");
  	return sprintf(buf, "%lu\n", result);
  }
  
  static ssize_t store_ideapad_cam(struct device *dev,
  				 struct device_attribute *attr,
  				 const char *buf, size_t count)
  {
  	int ret, state;
  	struct ideapad_private *priv = dev_get_drvdata(dev);
  
  	if (!count)
  		return 0;
  	if (sscanf(buf, "%i", &state) != 1)
  		return -EINVAL;
  	ret = write_ec_cmd(priv->adev->handle, VPCCMD_W_CAMERA, state);
  	if (ret < 0)
  		return -EIO;
  	return count;
  }
  
  static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
  
  static ssize_t show_ideapad_fan(struct device *dev,
  				struct device_attribute *attr,
  				char *buf)
  {
  	unsigned long result;
  	struct ideapad_private *priv = dev_get_drvdata(dev);
  
  	if (read_ec_data(priv->adev->handle, VPCCMD_R_FAN, &result))
  		return sprintf(buf, "-1\n");
  	return sprintf(buf, "%lu\n", result);
  }
  
  static ssize_t store_ideapad_fan(struct device *dev,
  				 struct device_attribute *attr,
  				 const char *buf, size_t count)
  {
  	int ret, state;
  	struct ideapad_private *priv = dev_get_drvdata(dev);
  
  	if (!count)
  		return 0;
  	if (sscanf(buf, "%i", &state) != 1)
  		return -EINVAL;
  	if (state < 0 || state > 4 || state == 3)
  		return -EINVAL;
  	ret = write_ec_cmd(priv->adev->handle, VPCCMD_W_FAN, state);
  	if (ret < 0)
  		return -EIO;
  	return count;
  }
  
  static DEVICE_ATTR(fan_mode, 0644, show_ideapad_fan, store_ideapad_fan);
  
  static struct attribute *ideapad_attributes[] = {
  	&dev_attr_camera_power.attr,
  	&dev_attr_fan_mode.attr,
  	NULL
  };
  
  static umode_t ideapad_is_visible(struct kobject *kobj,
  				 struct attribute *attr,
  				 int idx)
  {
  	struct device *dev = container_of(kobj, struct device, kobj);
  	struct ideapad_private *priv = dev_get_drvdata(dev);
  	bool supported;
  
  	if (attr == &dev_attr_camera_power.attr)
  		supported = test_bit(CFG_CAMERA_BIT, &(priv->cfg));
  	else if (attr == &dev_attr_fan_mode.attr) {
  		unsigned long value;
  		supported = !read_ec_data(priv->adev->handle, VPCCMD_R_FAN,
  					  &value);
  	} else
  		supported = true;
  
  	return supported ? attr->mode : 0;
  }
  
  static const struct attribute_group ideapad_attribute_group = {
  	.is_visible = ideapad_is_visible,
  	.attrs = ideapad_attributes
  };
  
  /*
   * Rfkill
   */
  struct ideapad_rfk_data {
  	char *name;
  	int cfgbit;
  	int opcode;
  	int type;
  };
  
  static const struct ideapad_rfk_data ideapad_rfk_data[] = {
  	{ "ideapad_wlan",    CFG_WIFI_BIT, VPCCMD_W_WIFI, RFKILL_TYPE_WLAN },
  	{ "ideapad_bluetooth", CFG_BT_BIT, VPCCMD_W_BT, RFKILL_TYPE_BLUETOOTH },
  	{ "ideapad_3g",        CFG_3G_BIT, VPCCMD_W_3G, RFKILL_TYPE_WWAN },
  };
  
  static int ideapad_rfk_set(void *data, bool blocked)
  {
  	struct ideapad_rfk_priv *priv = data;
  	int opcode = ideapad_rfk_data[priv->dev].opcode;
  
  	return write_ec_cmd(priv->priv->adev->handle, opcode, !blocked);
  }
  
  static struct rfkill_ops ideapad_rfk_ops = {
  	.set_block = ideapad_rfk_set,
  };
  
  static void ideapad_sync_rfk_state(struct ideapad_private *priv)
  {
  	unsigned long hw_blocked = 0;
  	int i;
  
  	if (priv->has_hw_rfkill_switch) {
  		if (read_ec_data(priv->adev->handle, VPCCMD_R_RF, &hw_blocked))
  			return;
  		hw_blocked = !hw_blocked;
  	}
  
  	for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
  		if (priv->rfk[i])
  			rfkill_set_hw_state(priv->rfk[i], hw_blocked);
  }
  
  static int ideapad_register_rfkill(struct ideapad_private *priv, int dev)
  {
  	int ret;
  	unsigned long sw_blocked;
  
  	if (no_bt_rfkill &&
  	    (ideapad_rfk_data[dev].type == RFKILL_TYPE_BLUETOOTH)) {
  		/* Force to enable bluetooth when no_bt_rfkill=1 */
  		write_ec_cmd(priv->adev->handle,
  			     ideapad_rfk_data[dev].opcode, 1);
  		return 0;
  	}
  	priv->rfk_priv[dev].dev = dev;
  	priv->rfk_priv[dev].priv = priv;
  
  	priv->rfk[dev] = rfkill_alloc(ideapad_rfk_data[dev].name,
  				      &priv->platform_device->dev,
  				      ideapad_rfk_data[dev].type,
  				      &ideapad_rfk_ops,
  				      &priv->rfk_priv[dev]);
  	if (!priv->rfk[dev])
  		return -ENOMEM;
  
  	if (read_ec_data(priv->adev->handle, ideapad_rfk_data[dev].opcode-1,
  			 &sw_blocked)) {
  		rfkill_init_sw_state(priv->rfk[dev], 0);
  	} else {
  		sw_blocked = !sw_blocked;
  		rfkill_init_sw_state(priv->rfk[dev], sw_blocked);
  	}
  
  	ret = rfkill_register(priv->rfk[dev]);
  	if (ret) {
  		rfkill_destroy(priv->rfk[dev]);
  		return ret;
  	}
  	return 0;
  }
  
  static void ideapad_unregister_rfkill(struct ideapad_private *priv, int dev)
  {
  	if (!priv->rfk[dev])
  		return;
  
  	rfkill_unregister(priv->rfk[dev]);
  	rfkill_destroy(priv->rfk[dev]);
  }
  
  /*
   * Platform device
   */
  static int ideapad_sysfs_init(struct ideapad_private *priv)
  {
  	return sysfs_create_group(&priv->platform_device->dev.kobj,
  				    &ideapad_attribute_group);
  }
  
  static void ideapad_sysfs_exit(struct ideapad_private *priv)
  {
  	sysfs_remove_group(&priv->platform_device->dev.kobj,
  			   &ideapad_attribute_group);
  }
  
  /*
   * input device
   */
  static const struct key_entry ideapad_keymap[] = {
  	{ KE_KEY, 6,  { KEY_SWITCHVIDEOMODE } },
  	{ KE_KEY, 7,  { KEY_CAMERA } },
  	{ KE_KEY, 8,  { KEY_MICMUTE } },
  	{ KE_KEY, 11, { KEY_F16 } },
  	{ KE_KEY, 13, { KEY_WLAN } },
  	{ KE_KEY, 16, { KEY_PROG1 } },
  	{ KE_KEY, 17, { KEY_PROG2 } },
  	{ KE_KEY, 64, { KEY_PROG3 } },
  	{ KE_KEY, 65, { KEY_PROG4 } },
  	{ KE_KEY, 66, { KEY_TOUCHPAD_OFF } },
  	{ KE_KEY, 67, { KEY_TOUCHPAD_ON } },
  	{ KE_KEY, 128, { KEY_ESC } },
  
  	{ KE_END, 0 },
  };
  
  static int ideapad_input_init(struct ideapad_private *priv)
  {
  	struct input_dev *inputdev;
  	int error;
  
  	inputdev = input_allocate_device();
  	if (!inputdev)
  		return -ENOMEM;
  
  	inputdev->name = "Ideapad extra buttons";
  	inputdev->phys = "ideapad/input0";
  	inputdev->id.bustype = BUS_HOST;
  	inputdev->dev.parent = &priv->platform_device->dev;
  
  	error = sparse_keymap_setup(inputdev, ideapad_keymap, NULL);
  	if (error) {
  		pr_err("Unable to setup input device keymap\n");
  		goto err_free_dev;
  	}
  
  	error = input_register_device(inputdev);
  	if (error) {
  		pr_err("Unable to register input device\n");
  		goto err_free_keymap;
  	}
  
  	priv->inputdev = inputdev;
  	return 0;
  
  err_free_keymap:
  	sparse_keymap_free(inputdev);
  err_free_dev:
  	input_free_device(inputdev);
  	return error;
  }
  
  static void ideapad_input_exit(struct ideapad_private *priv)
  {
  	sparse_keymap_free(priv->inputdev);
  	input_unregister_device(priv->inputdev);
  	priv->inputdev = NULL;
  }
  
  static void ideapad_input_report(struct ideapad_private *priv,
  				 unsigned long scancode)
  {
  	sparse_keymap_report_event(priv->inputdev, scancode, 1, true);
  }
  
  static void ideapad_input_novokey(struct ideapad_private *priv)
  {
  	unsigned long long_pressed;
  
  	if (read_ec_data(priv->adev->handle, VPCCMD_R_NOVO, &long_pressed))
  		return;
  	if (long_pressed)
  		ideapad_input_report(priv, 17);
  	else
  		ideapad_input_report(priv, 16);
  }
  
  static void ideapad_check_special_buttons(struct ideapad_private *priv)
  {
  	unsigned long bit, value;
  
  	read_ec_data(priv->adev->handle, VPCCMD_R_SPECIAL_BUTTONS, &value);
  
  	for (bit = 0; bit < 16; bit++) {
  		if (test_bit(bit, &value)) {
  			switch (bit) {
  			case 0:	/* Z580 */
  			case 6:	/* Z570 */
  				/* Thermal Management button */
  				ideapad_input_report(priv, 65);
  				break;
  			case 1:
  				/* OneKey Theater button */
  				ideapad_input_report(priv, 64);
  				break;
  			default:
  				pr_info("Unknown special button: %lu\n", bit);
  				break;
  			}
  		}
  	}
  }
  
  /*
   * backlight
   */
  static int ideapad_backlight_get_brightness(struct backlight_device *blightdev)
  {
  	struct ideapad_private *priv = bl_get_data(blightdev);
  	unsigned long now;
  
  	if (!priv)
  		return -EINVAL;
  
  	if (read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now))
  		return -EIO;
  	return now;
  }
  
  static int ideapad_backlight_update_status(struct backlight_device *blightdev)
  {
  	struct ideapad_private *priv = bl_get_data(blightdev);
  
  	if (!priv)
  		return -EINVAL;
  
  	if (write_ec_cmd(priv->adev->handle, VPCCMD_W_BL,
  			 blightdev->props.brightness))
  		return -EIO;
  	if (write_ec_cmd(priv->adev->handle, VPCCMD_W_BL_POWER,
  			 blightdev->props.power == FB_BLANK_POWERDOWN ? 0 : 1))
  		return -EIO;
  
  	return 0;
  }
  
  static const struct backlight_ops ideapad_backlight_ops = {
  	.get_brightness = ideapad_backlight_get_brightness,
  	.update_status = ideapad_backlight_update_status,
  };
  
  static int ideapad_backlight_init(struct ideapad_private *priv)
  {
  	struct backlight_device *blightdev;
  	struct backlight_properties props;
  	unsigned long max, now, power;
  
  	if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_MAX, &max))
  		return -EIO;
  	if (read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now))
  		return -EIO;
  	if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &power))
  		return -EIO;
  
  	memset(&props, 0, sizeof(struct backlight_properties));
  	props.max_brightness = max;
  	props.type = BACKLIGHT_PLATFORM;
  	blightdev = backlight_device_register("ideapad",
  					      &priv->platform_device->dev,
  					      priv,
  					      &ideapad_backlight_ops,
  					      &props);
  	if (IS_ERR(blightdev)) {
  		pr_err("Could not register backlight device\n");
  		return PTR_ERR(blightdev);
  	}
  
  	priv->blightdev = blightdev;
  	blightdev->props.brightness = now;
  	blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
  	backlight_update_status(blightdev);
  
  	return 0;
  }
  
  static void ideapad_backlight_exit(struct ideapad_private *priv)
  {
  	backlight_device_unregister(priv->blightdev);
  	priv->blightdev = NULL;
  }
  
  static void ideapad_backlight_notify_power(struct ideapad_private *priv)
  {
  	unsigned long power;
  	struct backlight_device *blightdev = priv->blightdev;
  
  	if (!blightdev)
  		return;
  	if (read_ec_data(priv->adev->handle, VPCCMD_R_BL_POWER, &power))
  		return;
  	blightdev->props.power = power ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
  }
  
  static void ideapad_backlight_notify_brightness(struct ideapad_private *priv)
  {
  	unsigned long now;
  
  	/* if we control brightness via acpi video driver */
  	if (priv->blightdev == NULL) {
  		read_ec_data(priv->adev->handle, VPCCMD_R_BL, &now);
  		return;
  	}
  
  	backlight_force_update(priv->blightdev, BACKLIGHT_UPDATE_HOTKEY);
  }
  
  /*
   * module init/exit
   */
  static void ideapad_sync_touchpad_state(struct ideapad_private *priv)
  {
  	unsigned long value;
  
  	/* Without reading from EC touchpad LED doesn't switch state */
  	if (!read_ec_data(priv->adev->handle, VPCCMD_R_TOUCHPAD, &value)) {
  		/* Some IdeaPads don't really turn off touchpad - they only
  		 * switch the LED state. We (de)activate KBC AUX port to turn
  		 * touchpad off and on. We send KEY_TOUCHPAD_OFF and
  		 * KEY_TOUCHPAD_ON to not to get out of sync with LED */
  		unsigned char param;
  		i8042_command(&param, value ? I8042_CMD_AUX_ENABLE :
  			      I8042_CMD_AUX_DISABLE);
  		ideapad_input_report(priv, value ? 67 : 66);
  	}
  }
  
  static void ideapad_acpi_notify(acpi_handle handle, u32 event, void *data)
  {
  	struct ideapad_private *priv = data;
  	unsigned long vpc1, vpc2, vpc_bit;
  
  	if (read_ec_data(handle, VPCCMD_R_VPC1, &vpc1))
  		return;
  	if (read_ec_data(handle, VPCCMD_R_VPC2, &vpc2))
  		return;
  
  	vpc1 = (vpc2 << 8) | vpc1;
  	for (vpc_bit = 0; vpc_bit < 16; vpc_bit++) {
  		if (test_bit(vpc_bit, &vpc1)) {
  			switch (vpc_bit) {
  			case 9:
  				ideapad_sync_rfk_state(priv);
  				break;
  			case 13:
  			case 11:
  			case 8:
  			case 7:
  			case 6:
  				ideapad_input_report(priv, vpc_bit);
  				break;
  			case 5:
  				ideapad_sync_touchpad_state(priv);
  				break;
  			case 4:
  				ideapad_backlight_notify_brightness(priv);
  				break;
  			case 3:
  				ideapad_input_novokey(priv);
  				break;
  			case 2:
  				ideapad_backlight_notify_power(priv);
  				break;
  			case 0:
  				ideapad_check_special_buttons(priv);
  				break;
  			default:
  				pr_info("Unknown event: %lu\n", vpc_bit);
  			}
  		}
  	}
  }
  
  #if IS_ENABLED(CONFIG_ACPI_WMI)
  static void ideapad_wmi_notify(u32 value, void *context)
  {
  	switch (value) {
  	case 128:
  		ideapad_input_report(context, value);
  		break;
  	default:
  		pr_info("Unknown WMI event %u\n", value);
  	}
  }
  #endif
  
  /*
   * Some ideapads don't have a hardware rfkill switch, reading VPCCMD_R_RF
   * always results in 0 on these models, causing ideapad_laptop to wrongly
   * report all radios as hardware-blocked.
   */
  static const struct dmi_system_id no_hw_rfkill_list[] = {
  	{
  		.ident = "Lenovo G40-30",
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo G40-30"),
  		},
  	},
  	{
  		.ident = "Lenovo G50-30",
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo G50-30"),
  		},
  	},
  	{
  		.ident = "Lenovo ideapad Y700-15ISK",
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo ideapad Y700-15ISK"),
  		},
  	},
  	{
  		.ident = "Lenovo ideapad Y700 Touch-15ISK",
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo ideapad Y700 Touch-15ISK"),
  		},
  	},
  	{
  		.ident = "Lenovo ideapad Y700-17ISK",
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo ideapad Y700-17ISK"),
  		},
  	},
  	{
  		.ident = "Lenovo Yoga 2 11 / 13 / Pro",
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 2"),
  		},
  	},
  	{
  		.ident = "Lenovo Yoga 2 11 / 13 / Pro",
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_BOARD_NAME, "Yoga2"),
  		},
  	},
  	{
  		.ident = "Lenovo Yoga 3 1170 / 1470",
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 3"),
  		},
  	},
  	{
  		.ident = "Lenovo Yoga 3 Pro 1370",
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo YOGA 3"),
  		},
  	},
  	{
  		.ident = "Lenovo Yoga 700",
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo YOGA 700"),
  		},
  	},
  	{
  		.ident = "Lenovo Yoga 900",
  		.matches = {
  			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
  			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo YOGA 900"),
  		},
  	},
  	{}
  };
  
  static int ideapad_acpi_add(struct platform_device *pdev)
  {
  	int ret, i;
  	int cfg;
  	struct ideapad_private *priv;
  	struct acpi_device *adev;
  
  	ret = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev);
  	if (ret)
  		return -ENODEV;
  
  	if (read_method_int(adev->handle, "_CFG", &cfg))
  		return -ENODEV;
  
  	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
  	if (!priv)
  		return -ENOMEM;
  
  	dev_set_drvdata(&pdev->dev, priv);
  	priv->cfg = cfg;
  	priv->adev = adev;
  	priv->platform_device = pdev;
  	priv->has_hw_rfkill_switch = !dmi_check_system(no_hw_rfkill_list);
  
  	ret = ideapad_sysfs_init(priv);
  	if (ret)
  		return ret;
  
  	ret = ideapad_debugfs_init(priv);
  	if (ret)
  		goto debugfs_failed;
  
  	ret = ideapad_input_init(priv);
  	if (ret)
  		goto input_failed;
  
  	/*
  	 * On some models without a hw-switch (the yoga 2 13 at least)
  	 * VPCCMD_W_RF must be explicitly set to 1 for the wifi to work.
  	 */
  	if (!priv->has_hw_rfkill_switch)
  		write_ec_cmd(priv->adev->handle, VPCCMD_W_RF, 1);
  
  	for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
  		if (test_bit(ideapad_rfk_data[i].cfgbit, &priv->cfg))
  			ideapad_register_rfkill(priv, i);
  
  	ideapad_sync_rfk_state(priv);
  	ideapad_sync_touchpad_state(priv);
  
  	if (acpi_video_get_backlight_type() == acpi_backlight_vendor) {
  		ret = ideapad_backlight_init(priv);
  		if (ret && ret != -ENODEV)
  			goto backlight_failed;
  	}
  	ret = acpi_install_notify_handler(adev->handle,
  		ACPI_DEVICE_NOTIFY, ideapad_acpi_notify, priv);
  	if (ret)
  		goto notification_failed;
  
  #if IS_ENABLED(CONFIG_ACPI_WMI)
  	for (i = 0; i < ARRAY_SIZE(ideapad_wmi_fnesc_events); i++) {
  		ret = wmi_install_notify_handler(ideapad_wmi_fnesc_events[i],
  						 ideapad_wmi_notify, priv);
  		if (ret == AE_OK) {
  			priv->fnesc_guid = ideapad_wmi_fnesc_events[i];
  			break;
  		}
  	}
  	if (ret != AE_OK && ret != AE_NOT_EXIST)
  		goto notification_failed_wmi;
  #endif
  
  	return 0;
  #if IS_ENABLED(CONFIG_ACPI_WMI)
  notification_failed_wmi:
  	acpi_remove_notify_handler(priv->adev->handle,
  		ACPI_DEVICE_NOTIFY, ideapad_acpi_notify);
  #endif
  notification_failed:
  	ideapad_backlight_exit(priv);
  backlight_failed:
  	for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
  		ideapad_unregister_rfkill(priv, i);
  	ideapad_input_exit(priv);
  input_failed:
  	ideapad_debugfs_exit(priv);
  debugfs_failed:
  	ideapad_sysfs_exit(priv);
  	return ret;
  }
  
  static int ideapad_acpi_remove(struct platform_device *pdev)
  {
  	struct ideapad_private *priv = dev_get_drvdata(&pdev->dev);
  	int i;
  
  #if IS_ENABLED(CONFIG_ACPI_WMI)
  	if (priv->fnesc_guid)
  		wmi_remove_notify_handler(priv->fnesc_guid);
  #endif
  	acpi_remove_notify_handler(priv->adev->handle,
  		ACPI_DEVICE_NOTIFY, ideapad_acpi_notify);
  	ideapad_backlight_exit(priv);
  	for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
  		ideapad_unregister_rfkill(priv, i);
  	ideapad_input_exit(priv);
  	ideapad_debugfs_exit(priv);
  	ideapad_sysfs_exit(priv);
  	dev_set_drvdata(&pdev->dev, NULL);
  
  	return 0;
  }
  
  #ifdef CONFIG_PM_SLEEP
  static int ideapad_acpi_resume(struct device *device)
  {
  	struct ideapad_private *priv;
  
  	if (!device)
  		return -EINVAL;
  	priv = dev_get_drvdata(device);
  
  	ideapad_sync_rfk_state(priv);
  	ideapad_sync_touchpad_state(priv);
  	return 0;
  }
  #endif
  static SIMPLE_DEV_PM_OPS(ideapad_pm, NULL, ideapad_acpi_resume);
  
  static const struct acpi_device_id ideapad_device_ids[] = {
  	{ "VPC2004", 0},
  	{ "", 0},
  };
  MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
  
  static struct platform_driver ideapad_acpi_driver = {
  	.probe = ideapad_acpi_add,
  	.remove = ideapad_acpi_remove,
  	.driver = {
  		.name   = "ideapad_acpi",
  		.pm     = &ideapad_pm,
  		.acpi_match_table = ACPI_PTR(ideapad_device_ids),
  	},
  };
  
  module_platform_driver(ideapad_acpi_driver);
  
  MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
  MODULE_DESCRIPTION("IdeaPad ACPI Extras");
  MODULE_LICENSE("GPL");
  