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

/*
 *  Driver for Dell laptop extras
 *
 *  Copyright (c) Red Hat <[email protected]>
 *
 *  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 platform_driver platform_driver = {
	.driver = {
		.name = "dell-laptop",
		.owner = THIS_MODULE,
	}
};

static struct platform_device *platform_device;
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 __init 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 __init 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];

	rfkill_set_sw_state(rfkill, !!(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 __init 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", &platform_device->dev,
					   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",
						&platform_device->dev,
						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",
					   &platform_device->dev,
					   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 void dell_cleanup_rfkill(void)
{
	if (wifi_rfkill) {
		rfkill_unregister(wifi_rfkill);
		rfkill_destroy(wifi_rfkill);
	}
	if (bluetooth_rfkill) {
		rfkill_unregister(bluetooth_rfkill);
		rfkill_destroy(bluetooth_rfkill);
	}
	if (wwan_rfkill) {
		rfkill_unregister(wwan_rfkill);
		rfkill_destroy(wwan_rfkill);
	}
}

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 = platform_driver_register(&platform_driver);
	if (ret)
		goto fail_platform_driver;
	platform_device = platform_device_alloc("dell-laptop", -1);
	if (!platform_device) {
		ret = -ENOMEM;
		goto fail_platform_device1;
	}
	ret = platform_device_add(platform_device);
	if (ret)
		goto fail_platform_device2;

	ret = dell_setup_rfkill();

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

#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",
			&platform_device->dev, NULL,
			&dell_ops);

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

		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;

fail_backlight:
	dell_cleanup_rfkill();
fail_rfkill:
	platform_device_del(platform_device);
fail_platform_device2:
	platform_device_put(platform_device);
fail_platform_device1:
	platform_driver_unregister(&platform_driver);
fail_platform_driver:
	kfree(da_tokens);
	return ret;
}

static void __exit dell_exit(void)
{
	backlight_device_unregister(dell_backlight_device);
	dell_cleanup_rfkill();
}

module_init(dell_init);
module_exit(dell_exit);

MODULE_AUTHOR("Matthew Garrett <[email protected]>");
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 <[email protected]>
	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
ada3248a AJ	61	static struct platform_driver platform_driver = {
	62	.driver = {
	63	.name = "dell-laptop",
	64	.owner = THIS_MODULE,
	65	}
	66	};
	67
	68	static struct platform_device *platform_device;
ad8f07cc MG	69	static struct backlight_device *dell_backlight_device;
	70	static struct rfkill *wifi_rfkill;
	71	static struct rfkill *bluetooth_rfkill;
	72	static struct rfkill *wwan_rfkill;
	73
	74	static const struct dmi_system_id __initdata dell_device_table[] = {
	75	{
	76	.ident = "Dell laptop",
	77	.matches = {
	78	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	79	DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
	80	},
	81	},
	82	{ }
	83	};
	84
4788df4c	85	static void __init parse_da_table(const struct dmi_header *dm)
ad8f07cc MG	86	{
	87	/* Final token is a terminator, so we don't want to copy it */
	88	int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
	89	struct calling_interface_structure *table =
	90	container_of(dm, struct calling_interface_structure, header);
	91
	92	/* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
	93	6 bytes of entry */
	94
	95	if (dm->length < 17)
	96	return;
	97
	98	da_command_address = table->cmdIOAddress;
	99	da_command_code = table->cmdIOCode;
	100
	101	da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
	102	sizeof(struct calling_interface_token),
	103	GFP_KERNEL);
	104
	105	if (!da_tokens)
	106	return;
	107
	108	memcpy(da_tokens+da_num_tokens, table->tokens,
	109	sizeof(struct calling_interface_token) * tokens);
	110
	111	da_num_tokens += tokens;
	112	}
	113
4788df4c	114	static void __init find_tokens(const struct dmi_header dm, void dummy)
ad8f07cc MG	115	{
	116	switch (dm->type) {
	117	case 0xd4: /* Indexed IO */
	118	break;
	119	case 0xd5: /* Protected Area Type 1 */
	120	break;
	121	case 0xd6: /* Protected Area Type 2 */
	122	break;
	123	case 0xda: /* Calling interface */
	124	parse_da_table(dm);
	125	break;
	126	}
	127	}
	128
	129	static int find_token_location(int tokenid)
	130	{
	131	int i;
	132	for (i = 0; i < da_num_tokens; i++) {
	133	if (da_tokens[i].tokenID == tokenid)
	134	return da_tokens[i].location;
	135	}
	136
	137	return -1;
	138	}
	139
	140	static struct calling_interface_buffer *
	141	dell_send_request(struct calling_interface_buffer *buffer, int class,
	142	int select)
	143	{
	144	struct smi_cmd command;
	145
	146	command.magic = SMI_CMD_MAGIC;
	147	command.command_address = da_command_address;
	148	command.command_code = da_command_code;
	149	command.ebx = virt_to_phys(buffer);
	150	command.ecx = 0x42534931;
	151
	152	buffer->class = class;
	153	buffer->select = select;
	154
	155	dcdbas_smi_request(&command);
	156
	157	return buffer;
	158	}
	159
	160	/* Derived from information in DellWirelessCtl.cpp:
	161	Class 17, select 11 is radio control. It returns an array of 32-bit values.
	162
	163	result[0]: return code
	164	result[1]:
	165	Bit 0: Hardware switch supported
	166	Bit 1: Wifi locator supported
	167	Bit 2: Wifi is supported
	168	Bit 3: Bluetooth is supported
	169	Bit 4: WWAN is supported
	170	Bit 5: Wireless keyboard supported
	171	Bits 6-7: Reserved
	172	Bit 8: Wifi is installed
	173	Bit 9: Bluetooth is installed
	174	Bit 10: WWAN is installed
	175	Bits 11-15: Reserved
	176	Bit 16: Hardware switch is on
	177	Bit 17: Wifi is blocked
	178	Bit 18: Bluetooth is blocked
179	Bit 19: WWAN is blocked
180	Bits 20-31: Reserved
181	result[2]: NVRAM size in bytes
182	result[3]: NVRAM format version number
183	*/
184
19d337df	185	static int dell_rfkill_set(void *data, bool blocked)
ad8f07cc MG	186	{
ad8f07cc MG	187	struct calling_interface_buffer buffer;
624f0de4	188	int disable = blocked ? 1 : 0;
19d337df	189	unsigned long radio = (unsigned long)data;
ad8f07cc MG	190
	191	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	192	buffer.input[0] = (1 \| (radio<<8) \| (disable << 16));
	193	dell_send_request(&buffer, 17, 11);
	194
	195	return 0;
	196	}
	197
19d337df	198	static void dell_rfkill_query(struct rfkill rfkill, void data)
ad8f07cc MG	199	{
	200	struct calling_interface_buffer buffer;
	201	int status;
19d337df	202	int bit = (unsigned long)data + 16;
ad8f07cc MG	203
	204	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	205	dell_send_request(&buffer, 17, 11);
	206	status = buffer.output[1];
	207
e1fbf346 MG	208	rfkill_set_sw_state(rfkill, !!(status & BIT(bit)));
e1fbf346 MG	209	rfkill_set_hw_state(rfkill, !(status & BIT(16)));
ad8f07cc MG	210	}
ad8f07cc MG	211
19d337df JB	212	static const struct rfkill_ops dell_rfkill_ops = {
	213	.set_block = dell_rfkill_set,
	214	.query = dell_rfkill_query,
	215	};
ad8f07cc	216
4788df4c	217	static int __init dell_setup_rfkill(void)
ad8f07cc MG	218	{
	219	struct calling_interface_buffer buffer;
	220	int status;
	221	int ret;
	222
	223	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	224	dell_send_request(&buffer, 17, 11);
	225	status = buffer.output[1];
	226
	227	if ((status & (1<<2\|1<<8)) == (1<<2\|1<<8)) {
ada3248a AJ	228	wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
ada3248a AJ	229	RFKILL_TYPE_WLAN,
19d337df JB	230	&dell_rfkill_ops, (void *) 1);
	231	if (!wifi_rfkill) {
	232	ret = -ENOMEM;
ad8f07cc	233	goto err_wifi;
19d337df	234	}
ad8f07cc MG	235	ret = rfkill_register(wifi_rfkill);
	236	if (ret)
	237	goto err_wifi;
	238	}
	239
	240	if ((status & (1<<3\|1<<9)) == (1<<3\|1<<9)) {
ada3248a AJ	241	bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
ada3248a AJ	242	&platform_device->dev,
19d337df JB	243	RFKILL_TYPE_BLUETOOTH,
	244	&dell_rfkill_ops, (void *) 2);
	245	if (!bluetooth_rfkill) {
	246	ret = -ENOMEM;
ad8f07cc	247	goto err_bluetooth;
19d337df	248	}
ad8f07cc MG	249	ret = rfkill_register(bluetooth_rfkill);
	250	if (ret)
	251	goto err_bluetooth;
	252	}
	253
	254	if ((status & (1<<4\|1<<10)) == (1<<4\|1<<10)) {
ada3248a AJ	255	wwan_rfkill = rfkill_alloc("dell-wwan",
	256	&platform_device->dev,
	257	RFKILL_TYPE_WWAN,
19d337df JB	258	&dell_rfkill_ops, (void *) 3);
	259	if (!wwan_rfkill) {
	260	ret = -ENOMEM;
ad8f07cc	261	goto err_wwan;
19d337df	262	}
ad8f07cc MG	263	ret = rfkill_register(wwan_rfkill);
	264	if (ret)
	265	goto err_wwan;
	266	}
	267
	268	return 0;
	269	err_wwan:
19d337df JB	270	rfkill_destroy(wwan_rfkill);
19d337df JB	271	if (bluetooth_rfkill)
ad8f07cc	272	rfkill_unregister(bluetooth_rfkill);
ad8f07cc	273	err_bluetooth:
19d337df JB	274	rfkill_destroy(bluetooth_rfkill);
19d337df JB	275	if (wifi_rfkill)
ad8f07cc	276	rfkill_unregister(wifi_rfkill);
ad8f07cc	277	err_wifi:
19d337df	278	rfkill_destroy(wifi_rfkill);
ad8f07cc MG	279
	280	return ret;
	281	}
	282
4311bb23 AJ	283	static void dell_cleanup_rfkill(void)
	284	{
	285	if (wifi_rfkill) {
	286	rfkill_unregister(wifi_rfkill);
	287	rfkill_destroy(wifi_rfkill);
	288	}
	289	if (bluetooth_rfkill) {
	290	rfkill_unregister(bluetooth_rfkill);
	291	rfkill_destroy(bluetooth_rfkill);
	292	}
	293	if (wwan_rfkill) {
	294	rfkill_unregister(wwan_rfkill);
	295	rfkill_destroy(wwan_rfkill);
	296	}
	297	}
	298
ad8f07cc MG	299	static int dell_send_intensity(struct backlight_device *bd)
	300	{
	301	struct calling_interface_buffer buffer;
	302
	303	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	304	buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
	305	buffer.input[1] = bd->props.brightness;
	306
	307	if (buffer.input[0] == -1)
	308	return -ENODEV;
	309
	310	if (power_supply_is_system_supplied() > 0)
	311	dell_send_request(&buffer, 1, 2);
	312	else
	313	dell_send_request(&buffer, 1, 1);
	314
	315	return 0;
	316	}
	317
	318	static int dell_get_intensity(struct backlight_device *bd)
	319	{
	320	struct calling_interface_buffer buffer;
	321
	322	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	323	buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
	324
	325	if (buffer.input[0] == -1)
	326	return -ENODEV;
	327
	328	if (power_supply_is_system_supplied() > 0)
	329	dell_send_request(&buffer, 0, 2);
	330	else
	331	dell_send_request(&buffer, 0, 1);
	332
	333	return buffer.output[1];
	334	}
	335
	336	static struct backlight_ops dell_ops = {
	337	.get_brightness = dell_get_intensity,
	338	.update_status = dell_send_intensity,
	339	};
	340
	341	static int __init dell_init(void)
	342	{
	343	struct calling_interface_buffer buffer;
	344	int max_intensity = 0;
	345	int ret;
	346
	347	if (!dmi_check_system(dell_device_table))
	348	return -ENODEV;
	349
e7a19c56	350	dmi_walk(find_tokens, NULL);
ad8f07cc MG	351
	352	if (!da_tokens) {
	353	printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n");
	354	return -ENODEV;
	355	}
	356
ada3248a AJ	357	ret = platform_driver_register(&platform_driver);
	358	if (ret)
	359	goto fail_platform_driver;
	360	platform_device = platform_device_alloc("dell-laptop", -1);
	361	if (!platform_device) {
	362	ret = -ENOMEM;
	363	goto fail_platform_device1;
	364	}
	365	ret = platform_device_add(platform_device);
	366	if (ret)
	367	goto fail_platform_device2;
	368
ad8f07cc MG	369	ret = dell_setup_rfkill();
	370
	371	if (ret) {
	372	printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n");
71e9dc73	373	goto fail_rfkill;
ad8f07cc MG	374	}
	375
	376	#ifdef CONFIG_ACPI
	377	/* In the event of an ACPI backlight being available, don't
	378	* register the platform controller.
	379	*/
	380	if (acpi_video_backlight_support())
	381	return 0;
	382	#endif
	383
	384	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
	385	buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
	386
	387	if (buffer.input[0] != -1) {
	388	dell_send_request(&buffer, 0, 2);
	389	max_intensity = buffer.output[3];
	390	}
	391
	392	if (max_intensity) {
	393	dell_backlight_device = backlight_device_register(
	394	"dell_backlight",
ada3248a	395	&platform_device->dev, NULL,
ad8f07cc MG	396	&dell_ops);
	397
	398	if (IS_ERR(dell_backlight_device)) {
	399	ret = PTR_ERR(dell_backlight_device);
	400	dell_backlight_device = NULL;
71e9dc73	401	goto fail_backlight;
ad8f07cc MG	402	}
	403
	404	dell_backlight_device->props.max_brightness = max_intensity;
	405	dell_backlight_device->props.brightness =
	406	dell_get_intensity(dell_backlight_device);
	407	backlight_update_status(dell_backlight_device);
	408	}
	409
	410	return 0;
71e9dc73 AJ	411
71e9dc73 AJ	412	fail_backlight:
4311bb23	413	dell_cleanup_rfkill();
71e9dc73	414	fail_rfkill:
ada3248a AJ	415	platform_device_del(platform_device);
	416	fail_platform_device2:
	417	platform_device_put(platform_device);
	418	fail_platform_device1:
	419	platform_driver_unregister(&platform_driver);
	420	fail_platform_driver:
ad8f07cc MG	421	kfree(da_tokens);
	422	return ret;
	423	}
	424
	425	static void __exit dell_exit(void)
	426	{
	427	backlight_device_unregister(dell_backlight_device);
4311bb23	428	dell_cleanup_rfkill();
ad8f07cc MG	429	}
	430
	431	module_init(dell_init);
	432	module_exit(dell_exit);
	433
	434	MODULE_AUTHOR("Matthew Garrett <[email protected]>");
	435	MODULE_DESCRIPTION("Dell laptop driver");
	436	MODULE_LICENSE("GPL");
	437	MODULE_ALIAS("dmi:svnDellInc.::ct8:*");