[deliverable/linux.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 <linux/mm.h>
#include <linux/i8042.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"),
		},
	},
	{
		.ident = "Dell Computer Corporation",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
			DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
		},
	},
	{ }
};

static struct dmi_system_id __devinitdata dell_blacklist[] = {
	/* Supported by compal-laptop */
	{
		.ident = "Dell Mini 9",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 910"),
		},
	},
	{
		.ident = "Dell Mini 10",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1010"),
		},
	},
	{
		.ident = "Dell Mini 10v",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1011"),
		},
	},
	{
		.ident = "Dell Inspiron 11z",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1110"),
		},
	},
	{
		.ident = "Dell Mini 12",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1210"),
		},
	},
	{}
};

static struct calling_interface_buffer *buffer;
static struct page *bufferpage;
static DEFINE_MUTEX(buffer_mutex);

static int hwswitch_state;

static void get_buffer(void)
{
	mutex_lock(&buffer_mutex);
	memset(buffer, 0, sizeof(struct calling_interface_buffer));
}

static void release_buffer(void)
{
	mutex_unlock(&buffer_mutex);
}

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.

   Input byte 0 = 0: Wireless information

   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

   Input byte 0 = 2: Wireless switch configuration
   result[0]: return code
   result[1]:
     Bit 0:      Wifi controlled by switch
     Bit 1:      Bluetooth controlled by switch
     Bit 2:      WWAN controlled by switch
     Bits 3-6:   Reserved
     Bit 7:      Wireless switch config locked
     Bit 8:      Wifi locator enabled
     Bits 9-14:  Reserved
     Bit 15:     Wifi locator setting locked
     Bits 16-31: Reserved
*/

static int dell_rfkill_set(void *data, bool blocked)
{
	int disable = blocked ? 1 : 0;
	unsigned long radio = (unsigned long)data;
	int hwswitch_bit = (unsigned long)data - 1;
	int ret = 0;

	get_buffer();
	dell_send_request(buffer, 17, 11);

	/* If the hardware switch controls this radio, and the hardware
	   switch is disabled, don't allow changing the software state */
	if ((hwswitch_state & BIT(hwswitch_bit)) &&
	    !(buffer->output[1] & BIT(16))) {
		ret = -EINVAL;
		goto out;
	}

	buffer->input[0] = (1 | (radio<<8) | (disable << 16));
	dell_send_request(buffer, 17, 11);

out:
	release_buffer();
	return ret;
}

static void dell_rfkill_query(struct rfkill *rfkill, void *data)
{
	int status;
	int bit = (unsigned long)data + 16;
	int hwswitch_bit = (unsigned long)data - 1;

	get_buffer();
	dell_send_request(buffer, 17, 11);
	status = buffer->output[1];
	release_buffer();

	rfkill_set_sw_state(rfkill, !!(status & BIT(bit)));

	if (hwswitch_state & (BIT(hwswitch_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 void dell_update_rfkill(struct work_struct *ignored)
{
	if (wifi_rfkill)
		dell_rfkill_query(wifi_rfkill, (void *)1);
	if (bluetooth_rfkill)
		dell_rfkill_query(bluetooth_rfkill, (void *)2);
	if (wwan_rfkill)
		dell_rfkill_query(wwan_rfkill, (void *)3);
}
static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);


static int __init dell_setup_rfkill(void)
{
	int status;
	int ret;

	if (dmi_check_system(dell_blacklist)) {
		printk(KERN_INFO "dell-laptop: Blacklisted hardware detected - "
				"not enabling rfkill\n");
		return 0;
	}

	get_buffer();
	dell_send_request(buffer, 17, 11);
	status = buffer->output[1];
	buffer->input[0] = 0x2;
	dell_send_request(buffer, 17, 11);
	hwswitch_state = buffer->output[1];
	release_buffer();

	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)
{
	int ret = 0;

	get_buffer();
	buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
	buffer->input[1] = bd->props.brightness;

	if (buffer->input[0] == -1) {
		ret = -ENODEV;
		goto out;
	}

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

out:
	release_buffer();
	return 0;
}

static int dell_get_intensity(struct backlight_device *bd)
{
	int ret = 0;

	get_buffer();
	buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);

	if (buffer->input[0] == -1) {
		ret = -ENODEV;
		goto out;
	}

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

out:
	release_buffer();
	if (ret)
		return ret;
	return buffer->output[1];
}

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

bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
			      struct serio *port)
{
	static bool extended;

	if (str & 0x20)
		return false;

	if (unlikely(data == 0xe0)) {
		extended = true;
		return false;
	} else if (unlikely(extended)) {
		switch (data) {
		case 0x8:
			schedule_delayed_work(&dell_rfkill_work,
					      round_jiffies_relative(HZ));
			break;
		}
		extended = false;
	}

	return false;
}

static int __init dell_init(void)
{
	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;

	/*
	 * Allocate buffer below 4GB for SMI data--only 32-bit physical addr
	 * is passed to SMI handler.
	 */
	bufferpage = alloc_page(GFP_KERNEL | GFP_DMA32);

	if (!bufferpage)
		goto fail_buffer;
	buffer = page_address(bufferpage);
	mutex_init(&buffer_mutex);

	ret = dell_setup_rfkill();

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

	ret = i8042_install_filter(dell_laptop_i8042_filter);
	if (ret) {
		printk(KERN_WARNING
		       "dell-laptop: Unable to install key filter\n");
		goto fail_filter;
	}

#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

	get_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];
	}
	release_buffer();

	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:
	i8042_remove_filter(dell_laptop_i8042_filter);
fail_filter:
	dell_cleanup_rfkill();
fail_rfkill:
	free_page((unsigned long)bufferpage);
fail_buffer:
	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)
{
	cancel_delayed_work_sync(&dell_rfkill_work);
	i8042_remove_filter(dell_laptop_i8042_filter);
	backlight_device_unregister(dell_backlight_device);
	dell_cleanup_rfkill();
	if (platform_device) {
		platform_device_del(platform_device);
		platform_driver_unregister(&platform_driver);
	}
	kfree(da_tokens);
	free_page((unsigned long)buffer);
}

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:*");
MODULE_ALIAS("dmi:*svnDellComputerCorporation.:*: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>
116ee77b	25	#include <linux/mm.h>
814cb8ad	26	#include <linux/i8042.h>
cad73120	27	#include "../../firmware/dcdbas.h"
ad8f07cc MG	28
	29	#define BRIGHTNESS_TOKEN 0x7d
	30
	31	/* This structure will be modified by the firmware when we enter
	32	* system management mode, hence the volatiles */
	33
	34	struct calling_interface_buffer {
	35	u16 class;
	36	u16 select;
	37	volatile u32 input[4];
	38	volatile u32 output[4];
	39	} __packed;
	40
	41	struct calling_interface_token {
	42	u16 tokenID;
	43	u16 location;
	44	union {
	45	u16 value;
	46	u16 stringlength;
	47	};
	48	};
	49
	50	struct calling_interface_structure {
	51	struct dmi_header header;
	52	u16 cmdIOAddress;
	53	u8 cmdIOCode;
	54	u32 supportedCmds;
	55	struct calling_interface_token tokens[];
	56	} __packed;
	57
	58	static int da_command_address;
	59	static int da_command_code;
	60	static int da_num_tokens;
	61	static struct calling_interface_token *da_tokens;
	62
ada3248a AJ	63	static struct platform_driver platform_driver = {
	64	.driver = {
	65	.name = "dell-laptop",
	66	.owner = THIS_MODULE,
	67	}
	68	};
	69
	70	static struct platform_device *platform_device;
ad8f07cc MG	71	static struct backlight_device *dell_backlight_device;
	72	static struct rfkill *wifi_rfkill;
	73	static struct rfkill *bluetooth_rfkill;
	74	static struct rfkill *wwan_rfkill;
	75
	76	static const struct dmi_system_id __initdata dell_device_table[] = {
	77	{
	78	.ident = "Dell laptop",
	79	.matches = {
	80	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	81	DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
	82	},
	83	},
cb6a7937 EA	84	{
	85	.ident = "Dell Computer Corporation",
	86	.matches = {
	87	DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
	88	DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
	89	},
	90	},
ad8f07cc MG	91	{ }
	92	};
	93
e5fefd0c ML	94	static struct dmi_system_id __devinitdata dell_blacklist[] = {
	95	/* Supported by compal-laptop */
	96	{
	97	.ident = "Dell Mini 9",
	98	.matches = {
	99	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	100	DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 910"),
	101	},
	102	},
	103	{
	104	.ident = "Dell Mini 10",
	105	.matches = {
	106	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	107	DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1010"),
	108	},
	109	},
	110	{
	111	.ident = "Dell Mini 10v",
	112	.matches = {
	113	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	114	DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1011"),
	115	},
	116	},
	117	{
	118	.ident = "Dell Inspiron 11z",
	119	.matches = {
	120	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	121	DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1110"),
	122	},
	123	},
	124	{
	125	.ident = "Dell Mini 12",
	126	.matches = {
	127	DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
	128	DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1210"),
	129	},
	130	},
	131	{}
	132	};
	133
116ee77b	134	static struct calling_interface_buffer *buffer;
94d8f785 IM	135	static struct page *bufferpage;
94d8f785 IM	136	static DEFINE_MUTEX(buffer_mutex);
116ee77b	137
c6760ac4 MG	138	static int hwswitch_state;
c6760ac4 MG	139
116ee77b SH	140	static void get_buffer(void)
	141	{
	142	mutex_lock(&buffer_mutex);
	143	memset(buffer, 0, sizeof(struct calling_interface_buffer));
	144	}
	145
	146	static void release_buffer(void)
	147	{
	148	mutex_unlock(&buffer_mutex);
	149	}
	150
4788df4c	151	static void __init parse_da_table(const struct dmi_header *dm)
ad8f07cc MG	152	{
	153	/* Final token is a terminator, so we don't want to copy it */
	154	int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
	155	struct calling_interface_structure *table =
	156	container_of(dm, struct calling_interface_structure, header);
	157
	158	/* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
	159	6 bytes of entry */
	160
	161	if (dm->length < 17)
	162	return;
	163
	164	da_command_address = table->cmdIOAddress;
	165	da_command_code = table->cmdIOCode;
	166
	167	da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
	168	sizeof(struct calling_interface_token),
	169	GFP_KERNEL);
	170
	171	if (!da_tokens)
	172	return;
	173
	174	memcpy(da_tokens+da_num_tokens, table->tokens,
	175	sizeof(struct calling_interface_token) * tokens);
	176
	177	da_num_tokens += tokens;
	178	}
	179
4788df4c	180	static void __init find_tokens(const struct dmi_header dm, void dummy)
ad8f07cc MG	181	{
	182	switch (dm->type) {
	183	case 0xd4: /* Indexed IO */
	184	break;
	185	case 0xd5: /* Protected Area Type 1 */
	186	break;
	187	case 0xd6: /* Protected Area Type 2 */
	188	break;
	189	case 0xda: /* Calling interface */
	190	parse_da_table(dm);
	191	break;
	192	}
	193	}
	194
	195	static int find_token_location(int tokenid)
	196	{
	197	int i;
	198	for (i = 0; i < da_num_tokens; i++) {
	199	if (da_tokens[i].tokenID == tokenid)
	200	return da_tokens[i].location;
	201	}
	202
	203	return -1;
	204	}
	205
	206	static struct calling_interface_buffer *
	207	dell_send_request(struct calling_interface_buffer *buffer, int class,
	208	int select)
	209	{
	210	struct smi_cmd command;
	211
	212	command.magic = SMI_CMD_MAGIC;
	213	command.command_address = da_command_address;
	214	command.command_code = da_command_code;
	215	command.ebx = virt_to_phys(buffer);
	216	command.ecx = 0x42534931;
	217
	218	buffer->class = class;
	219	buffer->select = select;
	220
	221	dcdbas_smi_request(&command);
	222
	223	return buffer;
	224	}
	225
	226	/* Derived from information in DellWirelessCtl.cpp:
	227	Class 17, select 11 is radio control. It returns an array of 32-bit values.
	228
c6760ac4 MG	229	Input byte 0 = 0: Wireless information
c6760ac4 MG	230
ad8f07cc MG	231	result[0]: return code
	232	result[1]:
	233	Bit 0: Hardware switch supported
	234	Bit 1: Wifi locator supported
	235	Bit 2: Wifi is supported
	236	Bit 3: Bluetooth is supported
	237	Bit 4: WWAN is supported
	238	Bit 5: Wireless keyboard supported
	239	Bits 6-7: Reserved
	240	Bit 8: Wifi is installed
	241	Bit 9: Bluetooth is installed
	242	Bit 10: WWAN is installed
	243	Bits 11-15: Reserved
	244	Bit 16: Hardware switch is on
	245	Bit 17: Wifi is blocked
	246	Bit 18: Bluetooth is blocked
	247	Bit 19: WWAN is blocked
	248	Bits 20-31: Reserved
	249	result[2]: NVRAM size in bytes
	250	result[3]: NVRAM format version number
c6760ac4 MG	251
	252	Input byte 0 = 2: Wireless switch configuration
	253	result[0]: return code
	254	result[1]:
	255	Bit 0: Wifi controlled by switch
	256	Bit 1: Bluetooth controlled by switch
	257	Bit 2: WWAN controlled by switch
	258	Bits 3-6: Reserved
	259	Bit 7: Wireless switch config locked
	260	Bit 8: Wifi locator enabled
	261	Bits 9-14: Reserved
	262	Bit 15: Wifi locator setting locked
	263	Bits 16-31: Reserved
ad8f07cc MG	264	*/
ad8f07cc MG	265
19d337df	266	static int dell_rfkill_set(void *data, bool blocked)
ad8f07cc	267	{
624f0de4	268	int disable = blocked ? 1 : 0;
19d337df	269	unsigned long radio = (unsigned long)data;
c6760ac4	270	int hwswitch_bit = (unsigned long)data - 1;
116ee77b	271	int ret = 0;
ad8f07cc	272
116ee77b SH	273	get_buffer();
116ee77b SH	274	dell_send_request(buffer, 17, 11);
ec1722a2	275
c6760ac4 MG	276	/* If the hardware switch controls this radio, and the hardware
	277	switch is disabled, don't allow changing the software state */
	278	if ((hwswitch_state & BIT(hwswitch_bit)) &&
	279	!(buffer->output[1] & BIT(16))) {
116ee77b SH	280	ret = -EINVAL;
	281	goto out;
	282	}
ad8f07cc	283
116ee77b SH	284	buffer->input[0] = (1 \| (radio<<8) \| (disable << 16));
	285	dell_send_request(buffer, 17, 11);
	286
	287	out:
	288	release_buffer();
	289	return ret;
ad8f07cc MG	290	}
ad8f07cc MG	291
19d337df	292	static void dell_rfkill_query(struct rfkill rfkill, void data)
ad8f07cc	293	{
ad8f07cc	294	int status;
19d337df	295	int bit = (unsigned long)data + 16;
c6760ac4	296	int hwswitch_bit = (unsigned long)data - 1;
ad8f07cc	297
116ee77b SH	298	get_buffer();
	299	dell_send_request(buffer, 17, 11);
	300	status = buffer->output[1];
	301	release_buffer();
ad8f07cc	302
e1fbf346	303	rfkill_set_sw_state(rfkill, !!(status & BIT(bit)));
c6760ac4 MG	304
	305	if (hwswitch_state & (BIT(hwswitch_bit)))
	306	rfkill_set_hw_state(rfkill, !(status & BIT(16)));
ad8f07cc MG	307	}
ad8f07cc MG	308
19d337df JB	309	static const struct rfkill_ops dell_rfkill_ops = {
	310	.set_block = dell_rfkill_set,
	311	.query = dell_rfkill_query,
	312	};
ad8f07cc	313
814cb8ad MG	314	static void dell_update_rfkill(struct work_struct *ignored)
	315	{
	316	if (wifi_rfkill)
	317	dell_rfkill_query(wifi_rfkill, (void *)1);
	318	if (bluetooth_rfkill)
	319	dell_rfkill_query(bluetooth_rfkill, (void *)2);
	320	if (wwan_rfkill)
	321	dell_rfkill_query(wwan_rfkill, (void *)3);
	322	}
	323	static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
	324
	325
4788df4c	326	static int __init dell_setup_rfkill(void)
ad8f07cc	327	{
ad8f07cc MG	328	int status;
	329	int ret;
	330
e5fefd0c ML	331	if (dmi_check_system(dell_blacklist)) {
	332	printk(KERN_INFO "dell-laptop: Blacklisted hardware detected - "
	333	"not enabling rfkill\n");
	334	return 0;
	335	}
	336
116ee77b SH	337	get_buffer();
	338	dell_send_request(buffer, 17, 11);
	339	status = buffer->output[1];
c6760ac4 MG	340	buffer->input[0] = 0x2;
	341	dell_send_request(buffer, 17, 11);
	342	hwswitch_state = buffer->output[1];
116ee77b	343	release_buffer();
ad8f07cc MG	344
ad8f07cc MG	345	if ((status & (1<<2\|1<<8)) == (1<<2\|1<<8)) {
ada3248a AJ	346	wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
ada3248a AJ	347	RFKILL_TYPE_WLAN,
19d337df JB	348	&dell_rfkill_ops, (void *) 1);
	349	if (!wifi_rfkill) {
	350	ret = -ENOMEM;
ad8f07cc	351	goto err_wifi;
19d337df	352	}
ad8f07cc MG	353	ret = rfkill_register(wifi_rfkill);
	354	if (ret)
	355	goto err_wifi;
	356	}
	357
	358	if ((status & (1<<3\|1<<9)) == (1<<3\|1<<9)) {
ada3248a AJ	359	bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
ada3248a AJ	360	&platform_device->dev,
19d337df JB	361	RFKILL_TYPE_BLUETOOTH,
	362	&dell_rfkill_ops, (void *) 2);
	363	if (!bluetooth_rfkill) {
	364	ret = -ENOMEM;
ad8f07cc	365	goto err_bluetooth;
19d337df	366	}
ad8f07cc MG	367	ret = rfkill_register(bluetooth_rfkill);
	368	if (ret)
	369	goto err_bluetooth;
	370	}
	371
	372	if ((status & (1<<4\|1<<10)) == (1<<4\|1<<10)) {
ada3248a AJ	373	wwan_rfkill = rfkill_alloc("dell-wwan",
	374	&platform_device->dev,
	375	RFKILL_TYPE_WWAN,
19d337df JB	376	&dell_rfkill_ops, (void *) 3);
	377	if (!wwan_rfkill) {
	378	ret = -ENOMEM;
ad8f07cc	379	goto err_wwan;
19d337df	380	}
ad8f07cc MG	381	ret = rfkill_register(wwan_rfkill);
	382	if (ret)
	383	goto err_wwan;
	384	}
	385
	386	return 0;
	387	err_wwan:
19d337df JB	388	rfkill_destroy(wwan_rfkill);
19d337df JB	389	if (bluetooth_rfkill)
ad8f07cc	390	rfkill_unregister(bluetooth_rfkill);
ad8f07cc	391	err_bluetooth:
19d337df JB	392	rfkill_destroy(bluetooth_rfkill);
19d337df JB	393	if (wifi_rfkill)
ad8f07cc	394	rfkill_unregister(wifi_rfkill);
ad8f07cc	395	err_wifi:
19d337df	396	rfkill_destroy(wifi_rfkill);
ad8f07cc MG	397
	398	return ret;
	399	}
	400
4311bb23 AJ	401	static void dell_cleanup_rfkill(void)
	402	{
	403	if (wifi_rfkill) {
	404	rfkill_unregister(wifi_rfkill);
	405	rfkill_destroy(wifi_rfkill);
	406	}
	407	if (bluetooth_rfkill) {
	408	rfkill_unregister(bluetooth_rfkill);
	409	rfkill_destroy(bluetooth_rfkill);
	410	}
	411	if (wwan_rfkill) {
	412	rfkill_unregister(wwan_rfkill);
	413	rfkill_destroy(wwan_rfkill);
	414	}
	415	}
	416
ad8f07cc MG	417	static int dell_send_intensity(struct backlight_device *bd)
ad8f07cc MG	418	{
116ee77b	419	int ret = 0;
ad8f07cc	420
116ee77b SH	421	get_buffer();
	422	buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
	423	buffer->input[1] = bd->props.brightness;
ad8f07cc	424
116ee77b SH	425	if (buffer->input[0] == -1) {
	426	ret = -ENODEV;
	427	goto out;
	428	}
ad8f07cc MG	429
ad8f07cc MG	430	if (power_supply_is_system_supplied() > 0)
116ee77b	431	dell_send_request(buffer, 1, 2);
ad8f07cc	432	else
116ee77b	433	dell_send_request(buffer, 1, 1);
ad8f07cc	434
116ee77b SH	435	out:
116ee77b SH	436	release_buffer();
ad8f07cc MG	437	return 0;
	438	}
	439
	440	static int dell_get_intensity(struct backlight_device *bd)
	441	{
116ee77b	442	int ret = 0;
ad8f07cc	443
116ee77b SH	444	get_buffer();
116ee77b SH	445	buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
ad8f07cc	446
116ee77b SH	447	if (buffer->input[0] == -1) {
	448	ret = -ENODEV;
	449	goto out;
	450	}
ad8f07cc MG	451
ad8f07cc MG	452	if (power_supply_is_system_supplied() > 0)
116ee77b	453	dell_send_request(buffer, 0, 2);
ad8f07cc	454	else
116ee77b	455	dell_send_request(buffer, 0, 1);
ad8f07cc	456
116ee77b SH	457	out:
	458	release_buffer();
	459	if (ret)
	460	return ret;
	461	return buffer->output[1];
ad8f07cc MG	462	}
	463
	464	static struct backlight_ops dell_ops = {
	465	.get_brightness = dell_get_intensity,
	466	.update_status = dell_send_intensity,
	467	};
	468
814cb8ad MG	469	bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
	470	struct serio *port)
	471	{
	472	static bool extended;
	473
	474	if (str & 0x20)
	475	return false;
	476
	477	if (unlikely(data == 0xe0)) {
	478	extended = true;
	479	return false;
	480	} else if (unlikely(extended)) {
	481	switch (data) {
	482	case 0x8:
	483	schedule_delayed_work(&dell_rfkill_work,
	484	round_jiffies_relative(HZ));
	485	break;
	486	}
	487	extended = false;
	488	}
	489
	490	return false;
	491	}
	492
ad8f07cc MG	493	static int __init dell_init(void)
ad8f07cc MG	494	{
ad8f07cc MG	495	int max_intensity = 0;
	496	int ret;
	497
	498	if (!dmi_check_system(dell_device_table))
	499	return -ENODEV;
	500
e7a19c56	501	dmi_walk(find_tokens, NULL);
ad8f07cc MG	502
	503	if (!da_tokens) {
	504	printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n");
	505	return -ENODEV;
	506	}
	507
ada3248a AJ	508	ret = platform_driver_register(&platform_driver);
	509	if (ret)
	510	goto fail_platform_driver;
	511	platform_device = platform_device_alloc("dell-laptop", -1);
	512	if (!platform_device) {
	513	ret = -ENOMEM;
	514	goto fail_platform_device1;
	515	}
	516	ret = platform_device_add(platform_device);
	517	if (ret)
	518	goto fail_platform_device2;
	519
116ee77b SH	520	/*
	521	* Allocate buffer below 4GB for SMI data--only 32-bit physical addr
	522	* is passed to SMI handler.
	523	*/
	524	bufferpage = alloc_page(GFP_KERNEL \| GFP_DMA32);
	525
	526	if (!bufferpage)
	527	goto fail_buffer;
	528	buffer = page_address(bufferpage);
	529	mutex_init(&buffer_mutex);
	530
ad8f07cc MG	531	ret = dell_setup_rfkill();
	532
	533	if (ret) {
	534	printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n");
71e9dc73	535	goto fail_rfkill;
ad8f07cc MG	536	}
ad8f07cc MG	537
814cb8ad MG	538	ret = i8042_install_filter(dell_laptop_i8042_filter);
	539	if (ret) {
	540	printk(KERN_WARNING
	541	"dell-laptop: Unable to install key filter\n");
	542	goto fail_filter;
	543	}
	544
ad8f07cc MG	545	#ifdef CONFIG_ACPI
	546	/* In the event of an ACPI backlight being available, don't
	547	* register the platform controller.
	548	*/
	549	if (acpi_video_backlight_support())
	550	return 0;
	551	#endif
	552
116ee77b SH	553	get_buffer();
	554	buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
	555	if (buffer->input[0] != -1) {
	556	dell_send_request(buffer, 0, 2);
	557	max_intensity = buffer->output[3];
ad8f07cc	558	}
116ee77b	559	release_buffer();
ad8f07cc MG	560
	561	if (max_intensity) {
	562	dell_backlight_device = backlight_device_register(
	563	"dell_backlight",
ada3248a	564	&platform_device->dev, NULL,
ad8f07cc MG	565	&dell_ops);
	566
	567	if (IS_ERR(dell_backlight_device)) {
	568	ret = PTR_ERR(dell_backlight_device);
	569	dell_backlight_device = NULL;
71e9dc73	570	goto fail_backlight;
ad8f07cc MG	571	}
	572
	573	dell_backlight_device->props.max_brightness = max_intensity;
	574	dell_backlight_device->props.brightness =
	575	dell_get_intensity(dell_backlight_device);
	576	backlight_update_status(dell_backlight_device);
	577	}
	578
	579	return 0;
71e9dc73 AJ	580
71e9dc73 AJ	581	fail_backlight:
814cb8ad MG	582	i8042_remove_filter(dell_laptop_i8042_filter);
814cb8ad MG	583	fail_filter:
4311bb23	584	dell_cleanup_rfkill();
71e9dc73	585	fail_rfkill:
116ee77b SH	586	free_page((unsigned long)bufferpage);
116ee77b SH	587	fail_buffer:
ada3248a AJ	588	platform_device_del(platform_device);
	589	fail_platform_device2:
	590	platform_device_put(platform_device);
	591	fail_platform_device1:
	592	platform_driver_unregister(&platform_driver);
	593	fail_platform_driver:
ad8f07cc MG	594	kfree(da_tokens);
	595	return ret;
	596	}
	597
	598	static void __exit dell_exit(void)
	599	{
814cb8ad MG	600	cancel_delayed_work_sync(&dell_rfkill_work);
814cb8ad MG	601	i8042_remove_filter(dell_laptop_i8042_filter);
ad8f07cc	602	backlight_device_unregister(dell_backlight_device);
4311bb23	603	dell_cleanup_rfkill();
facd61d7 MG	604	if (platform_device) {
	605	platform_device_del(platform_device);
	606	platform_driver_unregister(&platform_driver);
	607	}
e551260b	608	kfree(da_tokens);
116ee77b	609	free_page((unsigned long)buffer);
ad8f07cc MG	610	}
	611
	612	module_init(dell_init);
	613	module_exit(dell_exit);
	614
	615	MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
	616	MODULE_DESCRIPTION("Dell laptop driver");
	617	MODULE_LICENSE("GPL");
	618	MODULE_ALIAS("dmi:svnDellInc.::ct8:*");
cb6a7937	619	MODULE_ALIAS("dmi:svnDellComputerCorporation.::ct8:*");