[linux-2.6-block.git] / drivers / platform / x86 / dell-laptop.c

/*
 *  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, void *dummy)
{
	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(void *data, bool blocked)
{
	struct calling_interface_buffer buffer;
	int disable = blocked ? 1 : 0;
	unsigned long radio = (unsigned long)data;

	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 void dell_rfkill_query(struct rfkill *rfkill, void *data)
{
	struct calling_interface_buffer buffer;
	int status;
	int bit = (unsigned long)data + 16;

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

	if (status & BIT(bit))
		rfkill_set_hw_state(rfkill, !!(status & BIT(16)));
}

static const struct rfkill_ops dell_rfkill_ops = {
	.set_block = dell_rfkill_set,
	.query = dell_rfkill_query,
};

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_alloc("dell-wifi", NULL, RFKILL_TYPE_WLAN,
					   &dell_rfkill_ops, (void *) 1);
		if (!wifi_rfkill) {
			ret = -ENOMEM;
			goto err_wifi;
		}
		ret = rfkill_register(wifi_rfkill);
		if (ret)
			goto err_wifi;
	}

	if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
		bluetooth_rfkill = rfkill_alloc("dell-bluetooth", NULL,
						RFKILL_TYPE_BLUETOOTH,
						&dell_rfkill_ops, (void *) 2);
		if (!bluetooth_rfkill) {
			ret = -ENOMEM;
			goto err_bluetooth;
		}
		ret = rfkill_register(bluetooth_rfkill);
		if (ret)
			goto err_bluetooth;
	}

	if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
		wwan_rfkill = rfkill_alloc("dell-wwan", NULL, RFKILL_TYPE_WWAN,
					   &dell_rfkill_ops, (void *) 3);
		if (!wwan_rfkill) {
			ret = -ENOMEM;
			goto err_wwan;
		}
		ret = rfkill_register(wwan_rfkill);
		if (ret)
			goto err_wwan;
	}

	return 0;
err_wwan:
	rfkill_destroy(wwan_rfkill);
	if (bluetooth_rfkill)
		rfkill_unregister(bluetooth_rfkill);
err_bluetooth:
	rfkill_destroy(bluetooth_rfkill);
	if (wifi_rfkill)
		rfkill_unregister(wifi_rfkill);
err_wifi:
	rfkill_destroy(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, NULL);

	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:*");
Commit	Line	Data
ad8f07cc MG	1	/*
	2	* Driver for Dell laptop extras
	3	*
	4	* Copyright (c) Red Hat <mjg@redhat.com>
	5	*
	6	* Based on documentation in the libsmbios package, Copyright (C) 2005 Dell
	7	* Inc.
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/kernel.h>
	16	#include <linux/init.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/backlight.h>
	19	#include <linux/err.h>
	20	#include <linux/dmi.h>
	21	#include <linux/io.h>
	22	#include <linux/rfkill.h>
	23	#include <linux/power_supply.h>
	24	#include <linux/acpi.h>
cad73120	25	#include "../../firmware/dcdbas.h"
ad8f07cc MG	26
	27	#define BRIGHTNESS_TOKEN 0x7d
	28
	29	/* This structure will be modified by the firmware when we enter
	30	* system management mode, hence the volatiles */
	31
	32	struct calling_interface_buffer {
	33	u16 class;
	34	u16 select;
	35	volatile u32 input[4];
	36	volatile u32 output[4];
	37	} __packed;
	38
	39	struct calling_interface_token {
	40	u16 tokenID;
	41	u16 location;
	42	union {
	43	u16 value;
	44	u16 stringlength;
	45	};
	46	};
	47
	48	struct calling_interface_structure {
	49	struct dmi_header header;
	50	u16 cmdIOAddress;
	51	u8 cmdIOCode;
	52	u32 supportedCmds;
	53	struct calling_interface_token tokens[];
	54	} __packed;
	55
	56	static int da_command_address;
	57	static int da_command_code;
	58	static int da_num_tokens;
	59	static struct calling_interface_token *da_tokens;
	60
	61	static struct backlight_device *dell_backlight_device;
	62	static struct rfkill *wifi_rfkill;
	63	static struct rfkill *bluetooth_rfkill;
	64	static struct rfkill *wwan_rfkill;
	65
	66	static const struct dmi_system_id __initdata dell_device_table[] = {
	67	{
	68	.ident = "Dell laptop",
	69	.matches = {
	70	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	71	DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
	72	},
	73	},
	74	{ }
	75	};
	76
	77	static void parse_da_table(const struct dmi_header *dm)
	78	{
	79	/* Final token is a terminator, so we don't want to copy it */
	80	int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
	81	struct calling_interface_structure *table =
	82	container_of(dm, struct calling_interface_structure, header);
	83
	84	/* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
	85	6 bytes of entry */
	86
	87	if (dm->length < 17)
	88	return;
	89
90	da_command_address = table->cmdIOAddress;
91	da_command_code = table->cmdIOCode;
92
93	da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
94	sizeof(struct calling_interface_token),
95	GFP_KERNEL);
96
97	if (!da_tokens)
98	return;
99
100	memcpy(da_tokens+da_num_tokens, table->tokens,
101	sizeof(struct calling_interface_token) * tokens);
102
103	da_num_tokens += tokens;
104	}
105
e7a19c56	106	static void find_tokens(const struct dmi_header dm, void dummy)
ad8f07cc MG	107	{
	108	switch (dm->type) {
	109	case 0xd4: /* Indexed IO */
	110	break;
	111	case 0xd5: /* Protected Area Type 1 */
	112	break;
	113	case 0xd6: /* Protected Area Type 2 */
	114	break;
	115	case 0xda: /* Calling interface */
	116	parse_da_table(dm);
	117	break;
	118	}
	119	}
	120
	121	static int find_token_location(int tokenid)
	122	{
	123	int i;
	124	for (i = 0; i < da_num_tokens; i++) {
	125	if (da_tokens[i].tokenID == tokenid)
	126	return da_tokens[i].location;
	127	}
	128
	129	return -1;
	130	}
	131
	132	static struct calling_interface_buffer *
	133	dell_send_request(struct calling_interface_buffer *buffer, int class,
	134	int select)
	135	{
	136	struct smi_cmd command;
	137
	138	command.magic = SMI_CMD_MAGIC;
	139	command.command_address = da_command_address;
	140	command.command_code = da_command_code;
	141	command.ebx = virt_to_phys(buffer);
	142	command.ecx = 0x42534931;
	143
	144	buffer->class = class;
	145	buffer->select = select;
	146
	147	dcdbas_smi_request(&command);
	148
	149	return buffer;
	150	}
	151
	152	/* Derived from information in DellWirelessCtl.cpp:
	153	Class 17, select 11 is radio control. It returns an array of 32-bit values.
	154
	155	result[0]: return code
	156	result[1]:
	157	Bit 0: Hardware switch supported
	158	Bit 1: Wifi locator supported
	159	Bit 2: Wifi is supported
	160	Bit 3: Bluetooth is supported
	161	Bit 4: WWAN is supported
	162	Bit 5: Wireless keyboard supported
	163	Bits 6-7: Reserved
	164	Bit 8: Wifi is installed
	165	Bit 9: Bluetooth is installed
	166	Bit 10: WWAN is installed
	167	Bits 11-15: Reserved
	168	Bit 16: Hardware switch is on
	169	Bit 17: Wifi is blocked
	170	Bit 18: Bluetooth is blocked
171	Bit 19: WWAN is blocked
172	Bits 20-31: Reserved
173	result[2]: NVRAM size in bytes
174	result[3]: NVRAM format version number
175	*/
176
19d337df	177	static int dell_rfkill_set(void *data, bool blocked)
ad8f07cc MG	178	{
ad8f07cc MG	179	struct calling_interface_buffer buffer;
624f0de4	180	int disable = blocked ? 1 : 0;
19d337df	181	unsigned long radio = (unsigned long)data;
ad8f07cc MG	182
	183	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	184	buffer.input[0] = (1 \| (radio<<8) \| (disable << 16));
	185	dell_send_request(&buffer, 17, 11);
	186
	187	return 0;
	188	}
	189
19d337df	190	static void dell_rfkill_query(struct rfkill rfkill, void data)
ad8f07cc MG	191	{
	192	struct calling_interface_buffer buffer;
	193	int status;
19d337df	194	int bit = (unsigned long)data + 16;
ad8f07cc MG	195
	196	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	197	dell_send_request(&buffer, 17, 11);
	198	status = buffer.output[1];
	199
19d337df JB	200	if (status & BIT(bit))
19d337df JB	201	rfkill_set_hw_state(rfkill, !!(status & BIT(16)));
ad8f07cc MG	202	}
ad8f07cc MG	203
19d337df JB	204	static const struct rfkill_ops dell_rfkill_ops = {
	205	.set_block = dell_rfkill_set,
	206	.query = dell_rfkill_query,
	207	};
ad8f07cc MG	208
	209	static int dell_setup_rfkill(void)
	210	{
	211	struct calling_interface_buffer buffer;
	212	int status;
	213	int ret;
	214
	215	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	216	dell_send_request(&buffer, 17, 11);
	217	status = buffer.output[1];
	218
	219	if ((status & (1<<2\|1<<8)) == (1<<2\|1<<8)) {
19d337df JB	220	wifi_rfkill = rfkill_alloc("dell-wifi", NULL, RFKILL_TYPE_WLAN,
	221	&dell_rfkill_ops, (void *) 1);
	222	if (!wifi_rfkill) {
	223	ret = -ENOMEM;
ad8f07cc	224	goto err_wifi;
19d337df	225	}
ad8f07cc MG	226	ret = rfkill_register(wifi_rfkill);
	227	if (ret)
	228	goto err_wifi;
	229	}
	230
	231	if ((status & (1<<3\|1<<9)) == (1<<3\|1<<9)) {
19d337df JB	232	bluetooth_rfkill = rfkill_alloc("dell-bluetooth", NULL,
	233	RFKILL_TYPE_BLUETOOTH,
	234	&dell_rfkill_ops, (void *) 2);
	235	if (!bluetooth_rfkill) {
	236	ret = -ENOMEM;
ad8f07cc	237	goto err_bluetooth;
19d337df	238	}
ad8f07cc MG	239	ret = rfkill_register(bluetooth_rfkill);
	240	if (ret)
	241	goto err_bluetooth;
	242	}
	243
	244	if ((status & (1<<4\|1<<10)) == (1<<4\|1<<10)) {
19d337df JB	245	wwan_rfkill = rfkill_alloc("dell-wwan", NULL, RFKILL_TYPE_WWAN,
	246	&dell_rfkill_ops, (void *) 3);
	247	if (!wwan_rfkill) {
	248	ret = -ENOMEM;
ad8f07cc	249	goto err_wwan;
19d337df	250	}
ad8f07cc MG	251	ret = rfkill_register(wwan_rfkill);
	252	if (ret)
	253	goto err_wwan;
	254	}
	255
	256	return 0;
	257	err_wwan:
19d337df JB	258	rfkill_destroy(wwan_rfkill);
19d337df JB	259	if (bluetooth_rfkill)
ad8f07cc	260	rfkill_unregister(bluetooth_rfkill);
ad8f07cc	261	err_bluetooth:
19d337df JB	262	rfkill_destroy(bluetooth_rfkill);
19d337df JB	263	if (wifi_rfkill)
ad8f07cc	264	rfkill_unregister(wifi_rfkill);
ad8f07cc	265	err_wifi:
19d337df	266	rfkill_destroy(wifi_rfkill);
ad8f07cc MG	267
	268	return ret;
	269	}
	270
	271	static int dell_send_intensity(struct backlight_device *bd)
	272	{
	273	struct calling_interface_buffer buffer;
	274
	275	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	276	buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
	277	buffer.input[1] = bd->props.brightness;
	278
	279	if (buffer.input[0] == -1)
	280	return -ENODEV;
	281
	282	if (power_supply_is_system_supplied() > 0)
	283	dell_send_request(&buffer, 1, 2);
	284	else
	285	dell_send_request(&buffer, 1, 1);
	286
	287	return 0;
	288	}
	289
	290	static int dell_get_intensity(struct backlight_device *bd)
	291	{
	292	struct calling_interface_buffer buffer;
	293
	294	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	295	buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
	296
	297	if (buffer.input[0] == -1)
	298	return -ENODEV;
	299
	300	if (power_supply_is_system_supplied() > 0)
	301	dell_send_request(&buffer, 0, 2);
	302	else
	303	dell_send_request(&buffer, 0, 1);
	304
	305	return buffer.output[1];
	306	}
	307
	308	static struct backlight_ops dell_ops = {
	309	.get_brightness = dell_get_intensity,
	310	.update_status = dell_send_intensity,
	311	};
	312
	313	static int __init dell_init(void)
	314	{
	315	struct calling_interface_buffer buffer;
	316	int max_intensity = 0;
	317	int ret;
	318
	319	if (!dmi_check_system(dell_device_table))
	320	return -ENODEV;
	321
e7a19c56	322	dmi_walk(find_tokens, NULL);
ad8f07cc MG	323
	324	if (!da_tokens) {
	325	printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n");
	326	return -ENODEV;
	327	}
	328
	329	ret = dell_setup_rfkill();
	330
	331	if (ret) {
	332	printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n");
	333	goto out;
	334	}
	335
	336	#ifdef CONFIG_ACPI
	337	/* In the event of an ACPI backlight being available, don't
	338	* register the platform controller.
	339	*/
	340	if (acpi_video_backlight_support())
	341	return 0;
	342	#endif
	343
	344	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	345	buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
	346
	347	if (buffer.input[0] != -1) {
	348	dell_send_request(&buffer, 0, 2);
	349	max_intensity = buffer.output[3];
	350	}
	351
	352	if (max_intensity) {
	353	dell_backlight_device = backlight_device_register(
	354	"dell_backlight",
	355	NULL, NULL,
	356	&dell_ops);
	357
	358	if (IS_ERR(dell_backlight_device)) {
	359	ret = PTR_ERR(dell_backlight_device);
	360	dell_backlight_device = NULL;
	361	goto out;
	362	}
	363
	364	dell_backlight_device->props.max_brightness = max_intensity;
	365	dell_backlight_device->props.brightness =
	366	dell_get_intensity(dell_backlight_device);
	367	backlight_update_status(dell_backlight_device);
	368	}
	369
	370	return 0;
	371	out:
	372	if (wifi_rfkill)
	373	rfkill_unregister(wifi_rfkill);
	374	if (bluetooth_rfkill)
	375	rfkill_unregister(bluetooth_rfkill);
	376	if (wwan_rfkill)
	377	rfkill_unregister(wwan_rfkill);
	378	kfree(da_tokens);
	379	return ret;
	380	}
	381
	382	static void __exit dell_exit(void)
	383	{
	384	backlight_device_unregister(dell_backlight_device);
	385	if (wifi_rfkill)
	386	rfkill_unregister(wifi_rfkill);
387	if (bluetooth_rfkill)
388	rfkill_unregister(bluetooth_rfkill);
389	if (wwan_rfkill)
390	rfkill_unregister(wwan_rfkill);
391	}
392
393	module_init(dell_init);
394	module_exit(dell_exit);
395
396	MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
397	MODULE_DESCRIPTION("Dell laptop driver");
398	MODULE_LICENSE("GPL");
399	MODULE_ALIAS("dmi:svnDellInc.::ct8:*");