text: // SPDX-License-Identifier: GPL-2.0-or-later
  /*
   * Alienware AlienFX control
   *
   * Copyright (C) 2014 Dell Inc <mario_limonciello@dell.com>
   */
  
  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  
  #include <linux/acpi.h>
  #include <linux/module.h>
  #include <linux/platform_device.h>
  #include <linux/dmi.h>
  #include <linux/leds.h>
  
  #define LEGACY_CONTROL_GUID		"A90597CE-A997-11DA-B012-B622A1EF5492"
  #define LEGACY_POWER_CONTROL_GUID	"A80593CE-A997-11DA-B012-B622A1EF5492"
  #define WMAX_CONTROL_GUID		"A70591CE-A997-11DA-B012-B622A1EF5492"
  
  #define WMAX_METHOD_HDMI_SOURCE		0x1
  #define WMAX_METHOD_HDMI_STATUS		0x2
  #define WMAX_METHOD_BRIGHTNESS		0x3
  #define WMAX_METHOD_ZONE_CONTROL	0x4
  #define WMAX_METHOD_HDMI_CABLE		0x5
  #define WMAX_METHOD_AMPLIFIER_CABLE	0x6
  #define WMAX_METHOD_DEEP_SLEEP_CONTROL	0x0B
  #define WMAX_METHOD_DEEP_SLEEP_STATUS	0x0C
  
  MODULE_AUTHOR("Mario Limonciello <mario_limonciello@dell.com>");
  MODULE_DESCRIPTION("Alienware special feature control");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("wmi:" LEGACY_CONTROL_GUID);
  MODULE_ALIAS("wmi:" WMAX_CONTROL_GUID);
  
  enum INTERFACE_FLAGS {
  	LEGACY,
  	WMAX,
  };
  
  enum LEGACY_CONTROL_STATES {
  	LEGACY_RUNNING = 1,
  	LEGACY_BOOTING = 0,
  	LEGACY_SUSPEND = 3,
  };
  
  enum WMAX_CONTROL_STATES {
  	WMAX_RUNNING = 0xFF,
  	WMAX_BOOTING = 0,
  	WMAX_SUSPEND = 3,
  };
  
  struct quirk_entry {
  	u8 num_zones;
  	u8 hdmi_mux;
  	u8 amplifier;
  	u8 deepslp;
  };
  
  static struct quirk_entry *quirks;
  
  
  static struct quirk_entry quirk_inspiron5675 = {
  	.num_zones = 2,
  	.hdmi_mux = 0,
  	.amplifier = 0,
  	.deepslp = 0,
  };
  
  static struct quirk_entry quirk_unknown = {
  	.num_zones = 2,
  	.hdmi_mux = 0,
  	.amplifier = 0,
  	.deepslp = 0,
  };
  
  static struct quirk_entry quirk_x51_r1_r2 = {
  	.num_zones = 3,
  	.hdmi_mux = 0,
  	.amplifier = 0,
  	.deepslp = 0,
  };
  
  static struct quirk_entry quirk_x51_r3 = {
  	.num_zones = 4,
  	.hdmi_mux = 0,
  	.amplifier = 1,
  	.deepslp = 0,
  };
  
  static struct quirk_entry quirk_asm100 = {
  	.num_zones = 2,
  	.hdmi_mux = 1,
  	.amplifier = 0,
  	.deepslp = 0,
  };
  
  static struct quirk_entry quirk_asm200 = {
  	.num_zones = 2,
  	.hdmi_mux = 1,
  	.amplifier = 0,
  	.deepslp = 1,
  };
  
  static struct quirk_entry quirk_asm201 = {
  	.num_zones = 2,
  	.hdmi_mux = 1,
  	.amplifier = 1,
  	.deepslp = 1,
  };
  
  static int __init dmi_matched(const struct dmi_system_id *dmi)
  {
  	quirks = dmi->driver_data;
  	return 1;
  }
  
  static const struct dmi_system_id alienware_quirks[] __initconst = {
  	{
  	 .callback = dmi_matched,
  	 .ident = "Alienware X51 R3",
  	 .matches = {
  		     DMI_MATCH(DMI_SYS_VENDOR, "Alienware"),
  		     DMI_MATCH(DMI_PRODUCT_NAME, "Alienware X51 R3"),
  		     },
  	 .driver_data = &quirk_x51_r3,
  	 },
  	{
  	 .callback = dmi_matched,
  	 .ident = "Alienware X51 R2",
  	 .matches = {
  		     DMI_MATCH(DMI_SYS_VENDOR, "Alienware"),
  		     DMI_MATCH(DMI_PRODUCT_NAME, "Alienware X51 R2"),
  		     },
  	 .driver_data = &quirk_x51_r1_r2,
  	 },
  	{
  	 .callback = dmi_matched,
  	 .ident = "Alienware X51 R1",
  	 .matches = {
  		     DMI_MATCH(DMI_SYS_VENDOR, "Alienware"),
  		     DMI_MATCH(DMI_PRODUCT_NAME, "Alienware X51"),
  		     },
  	 .driver_data = &quirk_x51_r1_r2,
  	 },
  	{
  	 .callback = dmi_matched,
  	 .ident = "Alienware ASM100",
  	 .matches = {
  		     DMI_MATCH(DMI_SYS_VENDOR, "Alienware"),
  		     DMI_MATCH(DMI_PRODUCT_NAME, "ASM100"),
  		     },
  	 .driver_data = &quirk_asm100,
  	 },
  	{
  	 .callback = dmi_matched,
  	 .ident = "Alienware ASM200",
  	 .matches = {
  		     DMI_MATCH(DMI_SYS_VENDOR, "Alienware"),
  		     DMI_MATCH(DMI_PRODUCT_NAME, "ASM200"),
  		     },
  	 .driver_data = &quirk_asm200,
  	 },
  	{
  	 .callback = dmi_matched,
  	 .ident = "Alienware ASM201",
  	 .matches = {
  		     DMI_MATCH(DMI_SYS_VENDOR, "Alienware"),
  		     DMI_MATCH(DMI_PRODUCT_NAME, "ASM201"),
  		     },
  	 .driver_data = &quirk_asm201,
  	 },
  	 {
  	 .callback = dmi_matched,
  	 .ident = "Dell Inc. Inspiron 5675",
  	 .matches = {
  		     DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  		     DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5675"),
  		     },
  	 .driver_data = &quirk_inspiron5675,
  	 },
  	{}
  };
  
  struct color_platform {
  	u8 blue;
  	u8 green;
  	u8 red;
  } __packed;
  
  struct platform_zone {
  	u8 location;
  	struct device_attribute *attr;
  	struct color_platform colors;
  };
  
  struct wmax_brightness_args {
  	u32 led_mask;
  	u32 percentage;
  };
  
  struct wmax_basic_args {
  	u8 arg;
  };
  
  struct legacy_led_args {
  	struct color_platform colors;
  	u8 brightness;
  	u8 state;
  } __packed;
  
  struct wmax_led_args {
  	u32 led_mask;
  	struct color_platform colors;
  	u8 state;
  } __packed;
  
  static struct platform_device *platform_device;
  static struct device_attribute *zone_dev_attrs;
  static struct attribute **zone_attrs;
  static struct platform_zone *zone_data;
  
  static struct platform_driver platform_driver = {
  	.driver = {
  		   .name = "alienware-wmi",
  		   }
  };
  
  static struct attribute_group zone_attribute_group = {
  	.name = "rgb_zones",
  };
  
  static u8 interface;
  static u8 lighting_control_state;
  static u8 global_brightness;
  
  /*
   * Helpers used for zone control
   */
  static int parse_rgb(const char *buf, struct platform_zone *zone)
  {
  	long unsigned int rgb;
  	int ret;
  	union color_union {
  		struct color_platform cp;
  		int package;
  	} repackager;
  
  	ret = kstrtoul(buf, 16, &rgb);
  	if (ret)
  		return ret;
  
  	/* RGB triplet notation is 24-bit hexadecimal */
  	if (rgb > 0xFFFFFF)
  		return -EINVAL;
  
  	repackager.package = rgb & 0x0f0f0f0f;
  	pr_debug("alienware-wmi: r: %d g:%d b: %d\n",
  		 repackager.cp.red, repackager.cp.green, repackager.cp.blue);
  	zone->colors = repackager.cp;
  	return 0;
  }
  
  static struct platform_zone *match_zone(struct device_attribute *attr)
  {
  	u8 zone;
  
  	for (zone = 0; zone < quirks->num_zones; zone++) {
  		if ((struct device_attribute *)zone_data[zone].attr == attr) {
  			pr_debug("alienware-wmi: matched zone location: %d\n",
  				 zone_data[zone].location);
  			return &zone_data[zone];
  		}
  	}
  	return NULL;
  }
  
  /*
   * Individual RGB zone control
   */
  static int alienware_update_led(struct platform_zone *zone)
  {
  	int method_id;
  	acpi_status status;
  	char *guid;
  	struct acpi_buffer input;
  	struct legacy_led_args legacy_args;
  	struct wmax_led_args wmax_basic_args;
  	if (interface == WMAX) {
  		wmax_basic_args.led_mask = 1 << zone->location;
  		wmax_basic_args.colors = zone->colors;
  		wmax_basic_args.state = lighting_control_state;
  		guid = WMAX_CONTROL_GUID;
  		method_id = WMAX_METHOD_ZONE_CONTROL;
  
  		input.length = (acpi_size) sizeof(wmax_basic_args);
  		input.pointer = &wmax_basic_args;
  	} else {
  		legacy_args.colors = zone->colors;
  		legacy_args.brightness = global_brightness;
  		legacy_args.state = 0;
  		if (lighting_control_state == LEGACY_BOOTING ||
  		    lighting_control_state == LEGACY_SUSPEND) {
  			guid = LEGACY_POWER_CONTROL_GUID;
  			legacy_args.state = lighting_control_state;
  		} else
  			guid = LEGACY_CONTROL_GUID;
  		method_id = zone->location + 1;
  
  		input.length = (acpi_size) sizeof(legacy_args);
  		input.pointer = &legacy_args;
  	}
  	pr_debug("alienware-wmi: guid %s method %d\n", guid, method_id);
  
  	status = wmi_evaluate_method(guid, 0, method_id, &input, NULL);
  	if (ACPI_FAILURE(status))
  		pr_err("alienware-wmi: zone set failure: %u\n", status);
  	return ACPI_FAILURE(status);
  }
  
  static ssize_t zone_show(struct device *dev, struct device_attribute *attr,
  			 char *buf)
  {
  	struct platform_zone *target_zone;
  	target_zone = match_zone(attr);
  	if (target_zone == NULL)
  		return sprintf(buf, "red: -1, green: -1, blue: -1\n");
  	return sprintf(buf, "red: %d, green: %d, blue: %d\n",
  		       target_zone->colors.red,
  		       target_zone->colors.green, target_zone->colors.blue);
  
  }
  
  static ssize_t zone_set(struct device *dev, struct device_attribute *attr,
  			const char *buf, size_t count)
  {
  	struct platform_zone *target_zone;
  	int ret;
  	target_zone = match_zone(attr);
  	if (target_zone == NULL) {
  		pr_err("alienware-wmi: invalid target zone\n");
  		return 1;
  	}
  	ret = parse_rgb(buf, target_zone);
  	if (ret)
  		return ret;
  	ret = alienware_update_led(target_zone);
  	return ret ? ret : count;
  }
  
  /*
   * LED Brightness (Global)
   */
  static int wmax_brightness(int brightness)
  {
  	acpi_status status;
  	struct acpi_buffer input;
  	struct wmax_brightness_args args = {
  		.led_mask = 0xFF,
  		.percentage = brightness,
  	};
  	input.length = (acpi_size) sizeof(args);
  	input.pointer = &args;
  	status = wmi_evaluate_method(WMAX_CONTROL_GUID, 0,
  				     WMAX_METHOD_BRIGHTNESS, &input, NULL);
  	if (ACPI_FAILURE(status))
  		pr_err("alienware-wmi: brightness set failure: %u\n", status);
  	return ACPI_FAILURE(status);
  }
  
  static void global_led_set(struct led_classdev *led_cdev,
  			   enum led_brightness brightness)
  {
  	int ret;
  	global_brightness = brightness;
  	if (interface == WMAX)
  		ret = wmax_brightness(brightness);
  	else
  		ret = alienware_update_led(&zone_data[0]);
  	if (ret)
  		pr_err("LED brightness update failed\n");
  }
  
  static enum led_brightness global_led_get(struct led_classdev *led_cdev)
  {
  	return global_brightness;
  }
  
  static struct led_classdev global_led = {
  	.brightness_set = global_led_set,
  	.brightness_get = global_led_get,
  	.name = "alienware::global_brightness",
  };
  
  /*
   * Lighting control state device attribute (Global)
   */
  static ssize_t show_control_state(struct device *dev,
  				  struct device_attribute *attr, char *buf)
  {
  	if (lighting_control_state == LEGACY_BOOTING)
  		return scnprintf(buf, PAGE_SIZE, "[booting] running suspend\n");
  	else if (lighting_control_state == LEGACY_SUSPEND)
  		return scnprintf(buf, PAGE_SIZE, "booting running [suspend]\n");
  	return scnprintf(buf, PAGE_SIZE, "booting [running] suspend\n");
  }
  
  static ssize_t store_control_state(struct device *dev,
  				   struct device_attribute *attr,
  				   const char *buf, size_t count)
  {
  	long unsigned int val;
  	if (strcmp(buf, "booting\n") == 0)
  		val = LEGACY_BOOTING;
  	else if (strcmp(buf, "suspend\n") == 0)
  		val = LEGACY_SUSPEND;
  	else if (interface == LEGACY)
  		val = LEGACY_RUNNING;
  	else
  		val = WMAX_RUNNING;
  	lighting_control_state = val;
  	pr_debug("alienware-wmi: updated control state to %d\n",
  		 lighting_control_state);
  	return count;
  }
  
  static DEVICE_ATTR(lighting_control_state, 0644, show_control_state,
  		   store_control_state);
  
  static int alienware_zone_init(struct platform_device *dev)
  {
  	u8 zone;
  	char buffer[10];
  	char *name;
  
  	if (interface == WMAX) {
  		lighting_control_state = WMAX_RUNNING;
  	} else if (interface == LEGACY) {
  		lighting_control_state = LEGACY_RUNNING;
  	}
  	global_led.max_brightness = 0x0F;
  	global_brightness = global_led.max_brightness;
  
  	/*
  	 *      - zone_dev_attrs num_zones + 1 is for individual zones and then
  	 *        null terminated
  	 *      - zone_attrs num_zones + 2 is for all attrs in zone_dev_attrs +
  	 *        the lighting control + null terminated
  	 *      - zone_data num_zones is for the distinct zones
  	 */
  	zone_dev_attrs =
  	    kcalloc(quirks->num_zones + 1, sizeof(struct device_attribute),
  		    GFP_KERNEL);
  	if (!zone_dev_attrs)
  		return -ENOMEM;
  
  	zone_attrs =
  	    kcalloc(quirks->num_zones + 2, sizeof(struct attribute *),
  		    GFP_KERNEL);
  	if (!zone_attrs)
  		return -ENOMEM;
  
  	zone_data =
  	    kcalloc(quirks->num_zones, sizeof(struct platform_zone),
  		    GFP_KERNEL);
  	if (!zone_data)
  		return -ENOMEM;
  
  	for (zone = 0; zone < quirks->num_zones; zone++) {
  		sprintf(buffer, "zone%02hhX", zone);
  		name = kstrdup(buffer, GFP_KERNEL);
  		if (name == NULL)
  			return 1;
  		sysfs_attr_init(&zone_dev_attrs[zone].attr);
  		zone_dev_attrs[zone].attr.name = name;
  		zone_dev_attrs[zone].attr.mode = 0644;
  		zone_dev_attrs[zone].show = zone_show;
  		zone_dev_attrs[zone].store = zone_set;
  		zone_data[zone].location = zone;
  		zone_attrs[zone] = &zone_dev_attrs[zone].attr;
  		zone_data[zone].attr = &zone_dev_attrs[zone];
  	}
  	zone_attrs[quirks->num_zones] = &dev_attr_lighting_control_state.attr;
  	zone_attribute_group.attrs = zone_attrs;
  
  	led_classdev_register(&dev->dev, &global_led);
  
  	return sysfs_create_group(&dev->dev.kobj, &zone_attribute_group);
  }
  
  static void alienware_zone_exit(struct platform_device *dev)
  {
  	u8 zone;
  
  	sysfs_remove_group(&dev->dev.kobj, &zone_attribute_group);
  	led_classdev_unregister(&global_led);
  	if (zone_dev_attrs) {
  		for (zone = 0; zone < quirks->num_zones; zone++)
  			kfree(zone_dev_attrs[zone].attr.name);
  	}
  	kfree(zone_dev_attrs);
  	kfree(zone_data);
  	kfree(zone_attrs);
  }
  
  static acpi_status alienware_wmax_command(struct wmax_basic_args *in_args,
  					  u32 command, int *out_data)
  {
  	acpi_status status;
  	union acpi_object *obj;
  	struct acpi_buffer input;
  	struct acpi_buffer output;
  
  	input.length = (acpi_size) sizeof(*in_args);
  	input.pointer = in_args;
  	if (out_data) {
  		output.length = ACPI_ALLOCATE_BUFFER;
  		output.pointer = NULL;
  		status = wmi_evaluate_method(WMAX_CONTROL_GUID, 0,
  					     command, &input, &output);
  		if (ACPI_SUCCESS(status)) {
  			obj = (union acpi_object *)output.pointer;
  			if (obj && obj->type == ACPI_TYPE_INTEGER)
  				*out_data = (u32)obj->integer.value;
  		}
  		kfree(output.pointer);
  	} else {
  		status = wmi_evaluate_method(WMAX_CONTROL_GUID, 0,
  					     command, &input, NULL);
  	}
  	return status;
  }
  
  /*
   *	The HDMI mux sysfs node indicates the status of the HDMI input mux.
   *	It can toggle between standard system GPU output and HDMI input.
   */
  static ssize_t show_hdmi_cable(struct device *dev,
  			       struct device_attribute *attr, char *buf)
  {
  	acpi_status status;
  	u32 out_data;
  	struct wmax_basic_args in_args = {
  		.arg = 0,
  	};
  	status =
  	    alienware_wmax_command(&in_args, WMAX_METHOD_HDMI_CABLE,
  				   (u32 *) &out_data);
  	if (ACPI_SUCCESS(status)) {
  		if (out_data == 0)
  			return scnprintf(buf, PAGE_SIZE,
  					 "[unconnected] connected unknown\n");
  		else if (out_data == 1)
  			return scnprintf(buf, PAGE_SIZE,
  					 "unconnected [connected] unknown\n");
  	}
  	pr_err("alienware-wmi: unknown HDMI cable status: %d\n", status);
  	return scnprintf(buf, PAGE_SIZE, "unconnected connected [unknown]\n");
  }
  
  static ssize_t show_hdmi_source(struct device *dev,
  				struct device_attribute *attr, char *buf)
  {
  	acpi_status status;
  	u32 out_data;
  	struct wmax_basic_args in_args = {
  		.arg = 0,
  	};
  	status =
  	    alienware_wmax_command(&in_args, WMAX_METHOD_HDMI_STATUS,
  				   (u32 *) &out_data);
  
  	if (ACPI_SUCCESS(status)) {
  		if (out_data == 1)
  			return scnprintf(buf, PAGE_SIZE,
  					 "[input] gpu unknown\n");
  		else if (out_data == 2)
  			return scnprintf(buf, PAGE_SIZE,
  					 "input [gpu] unknown\n");
  	}
  	pr_err("alienware-wmi: unknown HDMI source status: %u\n", status);
  	return scnprintf(buf, PAGE_SIZE, "input gpu [unknown]\n");
  }
  
  static ssize_t toggle_hdmi_source(struct device *dev,
  				  struct device_attribute *attr,
  				  const char *buf, size_t count)
  {
  	acpi_status status;
  	struct wmax_basic_args args;
  	if (strcmp(buf, "gpu\n") == 0)
  		args.arg = 1;
  	else if (strcmp(buf, "input\n") == 0)
  		args.arg = 2;
  	else
  		args.arg = 3;
  	pr_debug("alienware-wmi: setting hdmi to %d : %s", args.arg, buf);
  
  	status = alienware_wmax_command(&args, WMAX_METHOD_HDMI_SOURCE, NULL);
  
  	if (ACPI_FAILURE(status))
  		pr_err("alienware-wmi: HDMI toggle failed: results: %u\n",
  		       status);
  	return count;
  }
  
  static DEVICE_ATTR(cable, S_IRUGO, show_hdmi_cable, NULL);
  static DEVICE_ATTR(source, S_IRUGO | S_IWUSR, show_hdmi_source,
  		   toggle_hdmi_source);
  
  static struct attribute *hdmi_attrs[] = {
  	&dev_attr_cable.attr,
  	&dev_attr_source.attr,
  	NULL,
  };
  
  static const struct attribute_group hdmi_attribute_group = {
  	.name = "hdmi",
  	.attrs = hdmi_attrs,
  };
  
  static void remove_hdmi(struct platform_device *dev)
  {
  	if (quirks->hdmi_mux > 0)
  		sysfs_remove_group(&dev->dev.kobj, &hdmi_attribute_group);
  }
  
  static int create_hdmi(struct platform_device *dev)
  {
  	int ret;
  
  	ret = sysfs_create_group(&dev->dev.kobj, &hdmi_attribute_group);
  	if (ret)
  		remove_hdmi(dev);
  	return ret;
  }
  
  /*
   * Alienware GFX amplifier support
   * - Currently supports reading cable status
   * - Leaving expansion room to possibly support dock/undock events later
   */
  static ssize_t show_amplifier_status(struct device *dev,
  				     struct device_attribute *attr, char *buf)
  {
  	acpi_status status;
  	u32 out_data;
  	struct wmax_basic_args in_args = {
  		.arg = 0,
  	};
  	status =
  	    alienware_wmax_command(&in_args, WMAX_METHOD_AMPLIFIER_CABLE,
  				   (u32 *) &out_data);
  	if (ACPI_SUCCESS(status)) {
  		if (out_data == 0)
  			return scnprintf(buf, PAGE_SIZE,
  					 "[unconnected] connected unknown\n");
  		else if (out_data == 1)
  			return scnprintf(buf, PAGE_SIZE,
  					 "unconnected [connected] unknown\n");
  	}
  	pr_err("alienware-wmi: unknown amplifier cable status: %d\n", status);
  	return scnprintf(buf, PAGE_SIZE, "unconnected connected [unknown]\n");
  }
  
  static DEVICE_ATTR(status, S_IRUGO, show_amplifier_status, NULL);
  
  static struct attribute *amplifier_attrs[] = {
  	&dev_attr_status.attr,
  	NULL,
  };
  
  static const struct attribute_group amplifier_attribute_group = {
  	.name = "amplifier",
  	.attrs = amplifier_attrs,
  };
  
  static void remove_amplifier(struct platform_device *dev)
  {
  	if (quirks->amplifier > 0)
  		sysfs_remove_group(&dev->dev.kobj, &amplifier_attribute_group);
  }
  
  static int create_amplifier(struct platform_device *dev)
  {
  	int ret;
  
  	ret = sysfs_create_group(&dev->dev.kobj, &amplifier_attribute_group);
  	if (ret)
  		remove_amplifier(dev);
  	return ret;
  }
  
  /*
   * Deep Sleep Control support
   * - Modifies BIOS setting for deep sleep control allowing extra wakeup events
   */
  static ssize_t show_deepsleep_status(struct device *dev,
  				     struct device_attribute *attr, char *buf)
  {
  	acpi_status status;
  	u32 out_data;
  	struct wmax_basic_args in_args = {
  		.arg = 0,
  	};
  	status = alienware_wmax_command(&in_args, WMAX_METHOD_DEEP_SLEEP_STATUS,
  					(u32 *) &out_data);
  	if (ACPI_SUCCESS(status)) {
  		if (out_data == 0)
  			return scnprintf(buf, PAGE_SIZE,
  					 "[disabled] s5 s5_s4\n");
  		else if (out_data == 1)
  			return scnprintf(buf, PAGE_SIZE,
  					 "disabled [s5] s5_s4\n");
  		else if (out_data == 2)
  			return scnprintf(buf, PAGE_SIZE,
  					 "disabled s5 [s5_s4]\n");
  	}
  	pr_err("alienware-wmi: unknown deep sleep status: %d\n", status);
  	return scnprintf(buf, PAGE_SIZE, "disabled s5 s5_s4 [unknown]\n");
  }
  
  static ssize_t toggle_deepsleep(struct device *dev,
  				struct device_attribute *attr,
  				const char *buf, size_t count)
  {
  	acpi_status status;
  	struct wmax_basic_args args;
  
  	if (strcmp(buf, "disabled\n") == 0)
  		args.arg = 0;
  	else if (strcmp(buf, "s5\n") == 0)
  		args.arg = 1;
  	else
  		args.arg = 2;
  	pr_debug("alienware-wmi: setting deep sleep to %d : %s", args.arg, buf);
  
  	status = alienware_wmax_command(&args, WMAX_METHOD_DEEP_SLEEP_CONTROL,
  					NULL);
  
  	if (ACPI_FAILURE(status))
  		pr_err("alienware-wmi: deep sleep control failed: results: %u\n",
  			status);
  	return count;
  }
  
  static DEVICE_ATTR(deepsleep, S_IRUGO | S_IWUSR, show_deepsleep_status, toggle_deepsleep);
  
  static struct attribute *deepsleep_attrs[] = {
  	&dev_attr_deepsleep.attr,
  	NULL,
  };
  
  static const struct attribute_group deepsleep_attribute_group = {
  	.name = "deepsleep",
  	.attrs = deepsleep_attrs,
  };
  
  static void remove_deepsleep(struct platform_device *dev)
  {
  	if (quirks->deepslp > 0)
  		sysfs_remove_group(&dev->dev.kobj, &deepsleep_attribute_group);
  }
  
  static int create_deepsleep(struct platform_device *dev)
  {
  	int ret;
  
  	ret = sysfs_create_group(&dev->dev.kobj, &deepsleep_attribute_group);
  	if (ret)
  		remove_deepsleep(dev);
  	return ret;
  }
  
  static int __init alienware_wmi_init(void)
  {
  	int ret;
  
  	if (wmi_has_guid(LEGACY_CONTROL_GUID))
  		interface = LEGACY;
  	else if (wmi_has_guid(WMAX_CONTROL_GUID))
  		interface = WMAX;
  	else {
  		pr_warn("alienware-wmi: No known WMI GUID found\n");
  		return -ENODEV;
  	}
  
  	dmi_check_system(alienware_quirks);
  	if (quirks == NULL)
  		quirks = &quirk_unknown;
  
  	ret = platform_driver_register(&platform_driver);
  	if (ret)
  		goto fail_platform_driver;
  	platform_device = platform_device_alloc("alienware-wmi", -1);
  	if (!platform_device) {
  		ret = -ENOMEM;
  		goto fail_platform_device1;
  	}
  	ret = platform_device_add(platform_device);
  	if (ret)
  		goto fail_platform_device2;
  
  	if (quirks->hdmi_mux > 0) {
  		ret = create_hdmi(platform_device);
  		if (ret)
  			goto fail_prep_hdmi;
  	}
  
  	if (quirks->amplifier > 0) {
  		ret = create_amplifier(platform_device);
  		if (ret)
  			goto fail_prep_amplifier;
  	}
  
  	if (quirks->deepslp > 0) {
  		ret = create_deepsleep(platform_device);
  		if (ret)
  			goto fail_prep_deepsleep;
  	}
  
  	ret = alienware_zone_init(platform_device);
  	if (ret)
  		goto fail_prep_zones;
  
  	return 0;
  
  fail_prep_zones:
  	alienware_zone_exit(platform_device);
  fail_prep_deepsleep:
  fail_prep_amplifier:
  fail_prep_hdmi:
  	platform_device_del(platform_device);
  fail_platform_device2:
  	platform_device_put(platform_device);
  fail_platform_device1:
  	platform_driver_unregister(&platform_driver);
  fail_platform_driver:
  	return ret;
  }
  
  module_init(alienware_wmi_init);
  
  static void __exit alienware_wmi_exit(void)
  {
  	if (platform_device) {
  		alienware_zone_exit(platform_device);
  		remove_hdmi(platform_device);
  		platform_device_unregister(platform_device);
  		platform_driver_unregister(&platform_driver);
  	}
  }
  
  module_exit(alienware_wmi_exit);
  