drivers/misc/dell-laptop.c - kernel/msm-4.9 - Gitiles

 /*
  *  Driver for Dell laptop extras
  *
  *  Copyright (c) Red Hat <mjg@redhat.com>
  *
  *  Based on documentation in the libsmbios package, Copyright (C) 2005 Dell
  *  Inc.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2 as
  *  published by the Free Software Foundation.
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/backlight.h>
 #include <linux/err.h>
 #include <linux/dmi.h>
 #include <linux/io.h>
 #include <linux/rfkill.h>
 #include <linux/power_supply.h>
 #include <linux/acpi.h>
 #include "../firmware/dcdbas.h"

 #define BRIGHTNESS_TOKEN 0x7d

 /* This structure will be modified by the firmware when we enter
  * system management mode, hence the volatiles */

 struct calling_interface_buffer {
 	u16 class;
 	u16 select;
 	volatile u32 input[4];
 	volatile u32 output[4];
 } __packed;

 struct calling_interface_token {
 	u16 tokenID;
 	u16 location;
 	union {
 		u16 value;
 		u16 stringlength;
 	};
 };

 struct calling_interface_structure {
 	struct dmi_header header;
 	u16 cmdIOAddress;
 	u8 cmdIOCode;
 	u32 supportedCmds;
 	struct calling_interface_token tokens[];
 } __packed;

 static int da_command_address;
 static int da_command_code;
 static int da_num_tokens;
 static struct calling_interface_token *da_tokens;

 static struct backlight_device *dell_backlight_device;
 static struct rfkill *wifi_rfkill;
 static struct rfkill *bluetooth_rfkill;
 static struct rfkill *wwan_rfkill;

 static const struct dmi_system_id __initdata dell_device_table[] = {
 	{
 		.ident = "Dell laptop",
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 			DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
 		},
 	},
 	{ }
 };

 static void parse_da_table(const struct dmi_header *dm)
 {
 	/* Final token is a terminator, so we don't want to copy it */
 	int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
 	struct calling_interface_structure *table =
 		container_of(dm, struct calling_interface_structure, header);

 	/* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
 	   6 bytes of entry */

 	if (dm->length < 17)
 		return;

 	da_command_address = table->cmdIOAddress;
 	da_command_code = table->cmdIOCode;

 	da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
 			     sizeof(struct calling_interface_token),
 			     GFP_KERNEL);

 	if (!da_tokens)
 		return;

 	memcpy(da_tokens+da_num_tokens, table->tokens,
 	       sizeof(struct calling_interface_token) * tokens);

 	da_num_tokens += tokens;
 }

 static void find_tokens(const struct dmi_header *dm)
 {
 	switch (dm->type) {
 	case 0xd4: /* Indexed IO */
 		break;
 	case 0xd5: /* Protected Area Type 1 */
 		break;
 	case 0xd6: /* Protected Area Type 2 */
 		break;
 	case 0xda: /* Calling interface */
 		parse_da_table(dm);
 		break;
 	}
 }

 static int find_token_location(int tokenid)
 {
 	int i;
 	for (i = 0; i < da_num_tokens; i++) {
 		if (da_tokens[i].tokenID == tokenid)
 			return da_tokens[i].location;
 	}

 	return -1;
 }

 static struct calling_interface_buffer *
 dell_send_request(struct calling_interface_buffer *buffer, int class,
 		  int select)
 {
 	struct smi_cmd command;

 	command.magic = SMI_CMD_MAGIC;
 	command.command_address = da_command_address;
 	command.command_code = da_command_code;
 	command.ebx = virt_to_phys(buffer);
 	command.ecx = 0x42534931;

 	buffer->class = class;
 	buffer->select = select;

 	dcdbas_smi_request(&command);

 	return buffer;
 }

 /* Derived from information in DellWirelessCtl.cpp:
    Class 17, select 11 is radio control. It returns an array of 32-bit values.

    result[0]: return code
    result[1]:
      Bit 0:      Hardware switch supported
      Bit 1:      Wifi locator supported
      Bit 2:      Wifi is supported
      Bit 3:      Bluetooth is supported
      Bit 4:      WWAN is supported
      Bit 5:      Wireless keyboard supported
      Bits 6-7:   Reserved
      Bit 8:      Wifi is installed
      Bit 9:      Bluetooth is installed
      Bit 10:     WWAN is installed
      Bits 11-15: Reserved
      Bit 16:     Hardware switch is on
      Bit 17:     Wifi is blocked
      Bit 18:     Bluetooth is blocked
      Bit 19:     WWAN is blocked
      Bits 20-31: Reserved
    result[2]: NVRAM size in bytes
    result[3]: NVRAM format version number
 */

 static int dell_rfkill_set(int radio, enum rfkill_state state)
 {
 	struct calling_interface_buffer buffer;
 	int disable = (state == RFKILL_STATE_UNBLOCKED) ? 0 : 1;

 	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 	buffer.input[0] = (1 | (radio<<8) | (disable << 16));
 	dell_send_request(&buffer, 17, 11);

 	return 0;
 }

 static int dell_wifi_set(void *data, enum rfkill_state state)
 {
 	return dell_rfkill_set(1, state);
 }

 static int dell_bluetooth_set(void *data, enum rfkill_state state)
 {
 	return dell_rfkill_set(2, state);
 }

 static int dell_wwan_set(void *data, enum rfkill_state state)
 {
 	return dell_rfkill_set(3, state);
 }

 static int dell_rfkill_get(int bit, enum rfkill_state *state)
 {
 	struct calling_interface_buffer buffer;
 	int status;
 	int new_state = RFKILL_STATE_HARD_BLOCKED;

 	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 	dell_send_request(&buffer, 17, 11);
 	status = buffer.output[1];

 	if (status & (1<<16))
 		new_state = RFKILL_STATE_SOFT_BLOCKED;

 	if (status & (1<<bit))
 		*state = new_state;
 	else
 		*state = RFKILL_STATE_UNBLOCKED;

 	return 0;
 }

 static int dell_wifi_get(void *data, enum rfkill_state *state)
 {
 	return dell_rfkill_get(17, state);
 }

 static int dell_bluetooth_get(void *data, enum rfkill_state *state)
 {
 	return dell_rfkill_get(18, state);
 }

 static int dell_wwan_get(void *data, enum rfkill_state *state)
 {
 	return dell_rfkill_get(19, state);
 }

 static int dell_setup_rfkill(void)
 {
 	struct calling_interface_buffer buffer;
 	int status;
 	int ret;

 	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 	dell_send_request(&buffer, 17, 11);
 	status = buffer.output[1];

 	if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 		wifi_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_WLAN);
 		if (!wifi_rfkill)
 			goto err_wifi;
 		wifi_rfkill->name = "dell-wifi";
 		wifi_rfkill->toggle_radio = dell_wifi_set;
 		wifi_rfkill->get_state = dell_wifi_get;
 		ret = rfkill_register(wifi_rfkill);
 		if (ret)
 			goto err_wifi;
 	}

 	if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 		bluetooth_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_BLUETOOTH);
 		if (!bluetooth_rfkill)
 			goto err_bluetooth;
 		bluetooth_rfkill->name = "dell-bluetooth";
 		bluetooth_rfkill->toggle_radio = dell_bluetooth_set;
 		bluetooth_rfkill->get_state = dell_bluetooth_get;
 		ret = rfkill_register(bluetooth_rfkill);
 		if (ret)
 			goto err_bluetooth;
 	}

 	if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 		wwan_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_WWAN);
 		if (!wwan_rfkill)
 			goto err_wwan;
 		wwan_rfkill->name = "dell-wwan";
 		wwan_rfkill->toggle_radio = dell_wwan_set;
 		wwan_rfkill->get_state = dell_wwan_get;
 		ret = rfkill_register(wwan_rfkill);
 		if (ret)
 			goto err_wwan;
 	}

 	return 0;
 err_wwan:
 	if (wwan_rfkill)
 		rfkill_free(wwan_rfkill);
 	if (bluetooth_rfkill) {
 		rfkill_unregister(bluetooth_rfkill);
 		bluetooth_rfkill = NULL;
 	}
 err_bluetooth:
 	if (bluetooth_rfkill)
 		rfkill_free(bluetooth_rfkill);
 	if (wifi_rfkill) {
 		rfkill_unregister(wifi_rfkill);
 		wifi_rfkill = NULL;
 	}
 err_wifi:
 	if (wifi_rfkill)
 		rfkill_free(wifi_rfkill);

 	return ret;
 }

 static int dell_send_intensity(struct backlight_device *bd)
 {
 	struct calling_interface_buffer buffer;

 	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 	buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
 	buffer.input[1] = bd->props.brightness;

 	if (buffer.input[0] == -1)
 		return -ENODEV;

 	if (power_supply_is_system_supplied() > 0)
 		dell_send_request(&buffer, 1, 2);
 	else
 		dell_send_request(&buffer, 1, 1);

 	return 0;
 }

 static int dell_get_intensity(struct backlight_device *bd)
 {
 	struct calling_interface_buffer buffer;

 	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 	buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);

 	if (buffer.input[0] == -1)
 		return -ENODEV;

 	if (power_supply_is_system_supplied() > 0)
 		dell_send_request(&buffer, 0, 2);
 	else
 		dell_send_request(&buffer, 0, 1);

 	return buffer.output[1];
 }

 static struct backlight_ops dell_ops = {
 	.get_brightness = dell_get_intensity,
 	.update_status  = dell_send_intensity,
 };

 static int __init dell_init(void)
 {
 	struct calling_interface_buffer buffer;
 	int max_intensity = 0;
 	int ret;

 	if (!dmi_check_system(dell_device_table))
 		return -ENODEV;

 	dmi_walk(find_tokens);

 	if (!da_tokens)  {
 		printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n");
 		return -ENODEV;
 	}

 	ret = dell_setup_rfkill();

 	if (ret) {
 		printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n");
 		goto out;
 	}

 #ifdef CONFIG_ACPI
 	/* In the event of an ACPI backlight being available, don't
 	 * register the platform controller.
 	 */
 	if (acpi_video_backlight_support())
 		return 0;
 #endif

 	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 	buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);

 	if (buffer.input[0] != -1) {
 		dell_send_request(&buffer, 0, 2);
 		max_intensity = buffer.output[3];
 	}

 	if (max_intensity) {
 		dell_backlight_device = backlight_device_register(
 			"dell_backlight",
 			NULL, NULL,
 			&dell_ops);

 		if (IS_ERR(dell_backlight_device)) {
 			ret = PTR_ERR(dell_backlight_device);
 			dell_backlight_device = NULL;
 			goto out;
 		}

 		dell_backlight_device->props.max_brightness = max_intensity;
 		dell_backlight_device->props.brightness =
 			dell_get_intensity(dell_backlight_device);
 		backlight_update_status(dell_backlight_device);
 	}

 	return 0;
 out:
 	if (wifi_rfkill)
 		rfkill_unregister(wifi_rfkill);
 	if (bluetooth_rfkill)
 		rfkill_unregister(bluetooth_rfkill);
 	if (wwan_rfkill)
 		rfkill_unregister(wwan_rfkill);
 	kfree(da_tokens);
 	return ret;
 }

 static void __exit dell_exit(void)
 {
 	backlight_device_unregister(dell_backlight_device);
 	if (wifi_rfkill)
 		rfkill_unregister(wifi_rfkill);
 	if (bluetooth_rfkill)
 		rfkill_unregister(bluetooth_rfkill);
 	if (wwan_rfkill)
 		rfkill_unregister(wwan_rfkill);
 }

 module_init(dell_init);
 module_exit(dell_exit);

 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
 MODULE_DESCRIPTION("Dell laptop driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");
	/*
	* Driver for Dell laptop extras
	*
	* Copyright (c) Red Hat <mjg@redhat.com>
	*
	* Based on documentation in the libsmbios package, Copyright (C) 2005 Dell
	* Inc.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/platform_device.h>
	#include <linux/backlight.h>
	#include <linux/err.h>
	#include <linux/dmi.h>
	#include <linux/io.h>
	#include <linux/rfkill.h>
	#include <linux/power_supply.h>
	#include <linux/acpi.h>
	#include "../firmware/dcdbas.h"

	#define BRIGHTNESS_TOKEN 0x7d

	/* This structure will be modified by the firmware when we enter
	* system management mode, hence the volatiles */

	struct calling_interface_buffer {
	u16 class;
	u16 select;
	volatile u32 input[4];
	volatile u32 output[4];
	} __packed;

	struct calling_interface_token {
	u16 tokenID;
	u16 location;
	union {
	u16 value;
	u16 stringlength;
	};
	};

	struct calling_interface_structure {
	struct dmi_header header;
	u16 cmdIOAddress;
	u8 cmdIOCode;
	u32 supportedCmds;
	struct calling_interface_token tokens[];
	} __packed;

	static int da_command_address;
	static int da_command_code;
	static int da_num_tokens;
	static struct calling_interface_token *da_tokens;

	static struct backlight_device *dell_backlight_device;
	static struct rfkill *wifi_rfkill;
	static struct rfkill *bluetooth_rfkill;
	static struct rfkill *wwan_rfkill;

	static const struct dmi_system_id __initdata dell_device_table[] = {
	{
	.ident = "Dell laptop",
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
	},
	},
	{ }
	};

	static void parse_da_table(const struct dmi_header *dm)
	{
	/* Final token is a terminator, so we don't want to copy it */
	int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
	struct calling_interface_structure *table =
	container_of(dm, struct calling_interface_structure, header);

	/* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
	6 bytes of entry */

	if (dm->length < 17)
	return;

	da_command_address = table->cmdIOAddress;
	da_command_code = table->cmdIOCode;

	da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
	sizeof(struct calling_interface_token),
	GFP_KERNEL);

	if (!da_tokens)
	return;

	memcpy(da_tokens+da_num_tokens, table->tokens,
	sizeof(struct calling_interface_token) * tokens);

	da_num_tokens += tokens;
	}

	static void find_tokens(const struct dmi_header *dm)
	{
	switch (dm->type) {
	case 0xd4: /* Indexed IO */
	break;
	case 0xd5: /* Protected Area Type 1 */
	break;
	case 0xd6: /* Protected Area Type 2 */
	break;
	case 0xda: /* Calling interface */
	parse_da_table(dm);
	break;
	}
	}

	static int find_token_location(int tokenid)
	{
	int i;
	for (i = 0; i < da_num_tokens; i++) {
	if (da_tokens[i].tokenID == tokenid)
	return da_tokens[i].location;
	}

	return -1;
	}

	static struct calling_interface_buffer *
	dell_send_request(struct calling_interface_buffer *buffer, int class,
	int select)
	{
	struct smi_cmd command;

	command.magic = SMI_CMD_MAGIC;
	command.command_address = da_command_address;
	command.command_code = da_command_code;
	command.ebx = virt_to_phys(buffer);
	command.ecx = 0x42534931;

	buffer->class = class;
	buffer->select = select;

	dcdbas_smi_request(&command);

	return buffer;
	}

	/* Derived from information in DellWirelessCtl.cpp:
	Class 17, select 11 is radio control. It returns an array of 32-bit values.

	result[0]: return code
	result[1]:
	Bit 0: Hardware switch supported
	Bit 1: Wifi locator supported
	Bit 2: Wifi is supported
	Bit 3: Bluetooth is supported
	Bit 4: WWAN is supported
	Bit 5: Wireless keyboard supported
	Bits 6-7: Reserved
	Bit 8: Wifi is installed
	Bit 9: Bluetooth is installed
	Bit 10: WWAN is installed
	Bits 11-15: Reserved
	Bit 16: Hardware switch is on
	Bit 17: Wifi is blocked
	Bit 18: Bluetooth is blocked
	Bit 19: WWAN is blocked
	Bits 20-31: Reserved
	result[2]: NVRAM size in bytes
	result[3]: NVRAM format version number
	*/

	static int dell_rfkill_set(int radio, enum rfkill_state state)
	{
	struct calling_interface_buffer buffer;
	int disable = (state == RFKILL_STATE_UNBLOCKED) ? 0 : 1;

	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	buffer.input[0] = (1 \| (radio<<8) \| (disable << 16));
	dell_send_request(&buffer, 17, 11);

	return 0;
	}

	static int dell_wifi_set(void *data, enum rfkill_state state)
	{
	return dell_rfkill_set(1, state);
	}

	static int dell_bluetooth_set(void *data, enum rfkill_state state)
	{
	return dell_rfkill_set(2, state);
	}

	static int dell_wwan_set(void *data, enum rfkill_state state)
	{
	return dell_rfkill_set(3, state);
	}

	static int dell_rfkill_get(int bit, enum rfkill_state *state)
	{
	struct calling_interface_buffer buffer;
	int status;
	int new_state = RFKILL_STATE_HARD_BLOCKED;

	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	dell_send_request(&buffer, 17, 11);
	status = buffer.output[1];

	if (status & (1<<16))
	new_state = RFKILL_STATE_SOFT_BLOCKED;

	if (status & (1<<bit))
	*state = new_state;
	else
	*state = RFKILL_STATE_UNBLOCKED;

	return 0;
	}

	static int dell_wifi_get(void data, enum rfkill_state state)
	{
	return dell_rfkill_get(17, state);
	}

	static int dell_bluetooth_get(void data, enum rfkill_state state)
	{
	return dell_rfkill_get(18, state);
	}

	static int dell_wwan_get(void data, enum rfkill_state state)
	{
	return dell_rfkill_get(19, state);
	}

	static int dell_setup_rfkill(void)
	{
	struct calling_interface_buffer buffer;
	int status;
	int ret;

	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	dell_send_request(&buffer, 17, 11);
	status = buffer.output[1];

	if ((status & (1<<2\|1<<8)) == (1<<2\|1<<8)) {
	wifi_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_WLAN);
	if (!wifi_rfkill)
	goto err_wifi;
	wifi_rfkill->name = "dell-wifi";
	wifi_rfkill->toggle_radio = dell_wifi_set;
	wifi_rfkill->get_state = dell_wifi_get;
	ret = rfkill_register(wifi_rfkill);
	if (ret)
	goto err_wifi;
	}

	if ((status & (1<<3\|1<<9)) == (1<<3\|1<<9)) {
	bluetooth_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_BLUETOOTH);
	if (!bluetooth_rfkill)
	goto err_bluetooth;
	bluetooth_rfkill->name = "dell-bluetooth";
	bluetooth_rfkill->toggle_radio = dell_bluetooth_set;
	bluetooth_rfkill->get_state = dell_bluetooth_get;
	ret = rfkill_register(bluetooth_rfkill);
	if (ret)
	goto err_bluetooth;
	}

	if ((status & (1<<4\|1<<10)) == (1<<4\|1<<10)) {
	wwan_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_WWAN);
	if (!wwan_rfkill)
	goto err_wwan;
	wwan_rfkill->name = "dell-wwan";
	wwan_rfkill->toggle_radio = dell_wwan_set;
	wwan_rfkill->get_state = dell_wwan_get;
	ret = rfkill_register(wwan_rfkill);
	if (ret)
	goto err_wwan;
	}

	return 0;
	err_wwan:
	if (wwan_rfkill)
	rfkill_free(wwan_rfkill);
	if (bluetooth_rfkill) {
	rfkill_unregister(bluetooth_rfkill);
	bluetooth_rfkill = NULL;
	}
	err_bluetooth:
	if (bluetooth_rfkill)
	rfkill_free(bluetooth_rfkill);
	if (wifi_rfkill) {
	rfkill_unregister(wifi_rfkill);
	wifi_rfkill = NULL;
	}
	err_wifi:
	if (wifi_rfkill)
	rfkill_free(wifi_rfkill);

	return ret;
	}

	static int dell_send_intensity(struct backlight_device *bd)
	{
	struct calling_interface_buffer buffer;

	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
	buffer.input[1] = bd->props.brightness;

	if (buffer.input[0] == -1)
	return -ENODEV;

	if (power_supply_is_system_supplied() > 0)
	dell_send_request(&buffer, 1, 2);
	else
	dell_send_request(&buffer, 1, 1);

	return 0;
	}

	static int dell_get_intensity(struct backlight_device *bd)
	{
	struct calling_interface_buffer buffer;

	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);

	if (buffer.input[0] == -1)
	return -ENODEV;

	if (power_supply_is_system_supplied() > 0)
	dell_send_request(&buffer, 0, 2);
	else
	dell_send_request(&buffer, 0, 1);

	return buffer.output[1];
	}

	static struct backlight_ops dell_ops = {
	.get_brightness = dell_get_intensity,
	.update_status = dell_send_intensity,
	};

	static int __init dell_init(void)
	{
	struct calling_interface_buffer buffer;
	int max_intensity = 0;
	int ret;

	if (!dmi_check_system(dell_device_table))
	return -ENODEV;

	dmi_walk(find_tokens);

	if (!da_tokens) {
	printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n");
	return -ENODEV;
	}

	ret = dell_setup_rfkill();

	if (ret) {
	printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n");
	goto out;
	}

	#ifdef CONFIG_ACPI
	/* In the event of an ACPI backlight being available, don't
	* register the platform controller.
	*/
	if (acpi_video_backlight_support())
	return 0;
	#endif

	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);

	if (buffer.input[0] != -1) {
	dell_send_request(&buffer, 0, 2);
	max_intensity = buffer.output[3];
	}

	if (max_intensity) {
	dell_backlight_device = backlight_device_register(
	"dell_backlight",
	NULL, NULL,
	&dell_ops);

	if (IS_ERR(dell_backlight_device)) {
	ret = PTR_ERR(dell_backlight_device);
	dell_backlight_device = NULL;
	goto out;
	}

	dell_backlight_device->props.max_brightness = max_intensity;
	dell_backlight_device->props.brightness =
	dell_get_intensity(dell_backlight_device);
	backlight_update_status(dell_backlight_device);
	}

	return 0;
	out:
	if (wifi_rfkill)
	rfkill_unregister(wifi_rfkill);
	if (bluetooth_rfkill)
	rfkill_unregister(bluetooth_rfkill);
	if (wwan_rfkill)
	rfkill_unregister(wwan_rfkill);
	kfree(da_tokens);
	return ret;
	}

	static void __exit dell_exit(void)
	{
	backlight_device_unregister(dell_backlight_device);
	if (wifi_rfkill)
	rfkill_unregister(wifi_rfkill);
	if (bluetooth_rfkill)
	rfkill_unregister(bluetooth_rfkill);
	if (wwan_rfkill)
	rfkill_unregister(wwan_rfkill);
	}

	module_init(dell_init);
	module_exit(dell_exit);

	MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
	MODULE_DESCRIPTION("Dell laptop driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("dmi:svnDellInc.::ct8:*");