path: root/drivers/platform/x86/thinkpad_acpi.c

/*
 *  thinkpad_acpi.c - ThinkPad ACPI Extras
 *
 *
 *  Copyright (C) 2004-2005 Borislav Deianov <borislav@users.sf.net>
 *  Copyright (C) 2006-2009 Henrique de Moraes Holschuh <hmh@hmh.eng.br>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 *  02110-1301, USA.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#define TPACPI_VERSION "0.25"
#define TPACPI_SYSFS_VERSION 0x020700

/*
 *  Changelog:
 *  2007-10-20		changelog trimmed down
 *
 *  2007-03-27  0.14	renamed to thinkpad_acpi and moved to
 *  			drivers/misc.
 *
 *  2006-11-22	0.13	new maintainer
 *  			changelog now lives in git commit history, and will
 *  			not be updated further in-file.
 *
 *  2005-03-17	0.11	support for 600e, 770x
 *			    thanks to Jamie Lentin <lentinj@dial.pipex.com>
 *
 *  2005-01-16	0.9	use MODULE_VERSION
 *			    thanks to Henrik Brix Andersen <brix@gentoo.org>
 *			fix parameter passing on module loading
 *			    thanks to Rusty Russell <rusty@rustcorp.com.au>
 *			    thanks to Jim Radford <radford@blackbean.org>
 *  2004-11-08	0.8	fix init error case, don't return from a macro
 *			    thanks to Chris Wright <chrisw@osdl.org>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/nvram.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/sysfs.h>
#include <linux/backlight.h>
#include <linux/fb.h>
#include <linux/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/input.h>
#include <linux/leds.h>
#include <linux/rfkill.h>
#include <linux/dmi.h>
#include <linux/jiffies.h>
#include <linux/workqueue.h>
#include <linux/acpi.h>
#include <linux/pci_ids.h>
#include <linux/thinkpad_acpi.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/initval.h>
#include <asm/uaccess.h>
#include <acpi/video.h>

/* ThinkPad CMOS commands */
#define TP_CMOS_VOLUME_DOWN	0
#define TP_CMOS_VOLUME_UP	1
#define TP_CMOS_VOLUME_MUTE	2
#define TP_CMOS_BRIGHTNESS_UP	4
#define TP_CMOS_BRIGHTNESS_DOWN	5
#define TP_CMOS_THINKLIGHT_ON	12
#define TP_CMOS_THINKLIGHT_OFF	13

/* NVRAM Addresses */
enum tp_nvram_addr {
	TP_NVRAM_ADDR_HK2		= 0x57,
	TP_NVRAM_ADDR_THINKLIGHT	= 0x58,
	TP_NVRAM_ADDR_VIDEO		= 0x59,
	TP_NVRAM_ADDR_BRIGHTNESS	= 0x5e,
	TP_NVRAM_ADDR_MIXER		= 0x60,
};

/* NVRAM bit masks */
enum {
	TP_NVRAM_MASK_HKT_THINKPAD	= 0x08,
	TP_NVRAM_MASK_HKT_ZOOM		= 0x20,
	TP_NVRAM_MASK_HKT_DISPLAY	= 0x40,
	TP_NVRAM_MASK_HKT_HIBERNATE	= 0x80,
	TP_NVRAM_MASK_THINKLIGHT	= 0x10,
	TP_NVRAM_MASK_HKT_DISPEXPND	= 0x30,
	TP_NVRAM_MASK_HKT_BRIGHTNESS	= 0x20,
	TP_NVRAM_MASK_LEVEL_BRIGHTNESS	= 0x0f,
	TP_NVRAM_POS_LEVEL_BRIGHTNESS	= 0,
	TP_NVRAM_MASK_MUTE		= 0x40,
	TP_NVRAM_MASK_HKT_VOLUME	= 0x80,
	TP_NVRAM_MASK_LEVEL_VOLUME	= 0x0f,
	TP_NVRAM_POS_LEVEL_VOLUME	= 0,
};

/* Misc NVRAM-related */
enum {
	TP_NVRAM_LEVEL_VOLUME_MAX = 14,
};

/* ACPI HIDs */
#define TPACPI_ACPI_IBM_HKEY_HID	"IBM0068"
#define TPACPI_ACPI_LENOVO_HKEY_HID	"LEN0068"
#define TPACPI_ACPI_EC_HID		"PNP0C09"

/* Input IDs */
#define TPACPI_HKEY_INPUT_PRODUCT	0x5054 /* "TP" */
#define TPACPI_HKEY_INPUT_VERSION	0x4101

/* ACPI \WGSV commands */
enum {
	TP_ACPI_WGSV_GET_STATE		= 0x01, /* Get state information */
	TP_ACPI_WGSV_PWR_ON_ON_RESUME	= 0x02, /* Resume WWAN powered on */
	TP_ACPI_WGSV_PWR_OFF_ON_RESUME	= 0x03,	/* Resume WWAN powered off */
	TP_ACPI_WGSV_SAVE_STATE		= 0x04, /* Save state for S4/S5 */
};

/* TP_ACPI_WGSV_GET_STATE bits */
enum {
	TP_ACPI_WGSV_STATE_WWANEXIST	= 0x0001, /* WWAN hw available */
	TP_ACPI_WGSV_STATE_WWANPWR	= 0x0002, /* WWAN radio enabled */
	TP_ACPI_WGSV_STATE_WWANPWRRES	= 0x0004, /* WWAN state at resume */
	TP_ACPI_WGSV_STATE_WWANBIOSOFF	= 0x0008, /* WWAN disabled in BIOS */
	TP_ACPI_WGSV_STATE_BLTHEXIST	= 0x0001, /* BLTH hw available */
	TP_ACPI_WGSV_STATE_BLTHPWR	= 0x0002, /* BLTH radio enabled */
	TP_ACPI_WGSV_STATE_BLTHPWRRES	= 0x0004, /* BLTH state at resume */
	TP_ACPI_WGSV_STATE_BLTHBIOSOFF	= 0x0008, /* BLTH disabled in BIOS */
	TP_ACPI_WGSV_STATE_UWBEXIST	= 0x0010, /* UWB hw available */
	TP_ACPI_WGSV_STATE_UWBPWR	= 0x0020, /* UWB radio enabled */
};

/* HKEY events */
enum tpacpi_hkey_event_t {
	/* Hotkey-related */
	TP_HKEY_EV_HOTKEY_BASE		= 0x1001, /* first hotkey (FN+F1) */
	TP_HKEY_EV_BRGHT_UP		= 0x1010, /* Brightness up */
	TP_HKEY_EV_BRGHT_DOWN		= 0x1011, /* Brightness down */
	TP_HKEY_EV_VOL_UP		= 0x1015, /* Volume up or unmute */
	TP_HKEY_EV_VOL_DOWN		= 0x1016, /* Volume down or unmute */
	TP_HKEY_EV_VOL_MUTE		= 0x1017, /* Mixer output mute */

	/* Reasons for waking up from S3/S4 */
	TP_HKEY_EV_WKUP_S3_UNDOCK	= 0x2304, /* undock requested, S3 */
	TP_HKEY_EV_WKUP_S4_UNDOCK	= 0x2404, /* undock requested, S4 */
	TP_HKEY_EV_WKUP_S3_BAYEJ	= 0x2305, /* bay ejection req, S3 */
	TP_HKEY_EV_WKUP_S4_BAYEJ	= 0x2405, /* bay ejection req, S4 */
	TP_HKEY_EV_WKUP_S3_BATLOW	= 0x2313, /* battery empty, S3 */
	TP_HKEY_EV_WKUP_S4_BATLOW	= 0x2413, /* battery empty, S4 */

	/* Auto-sleep after eject request */
	TP_HKEY_EV_BAYEJ_ACK		= 0x3003, /* bay ejection complete */
	TP_HKEY_EV_UNDOCK_ACK		= 0x4003, /* undock complete */

	/* Misc bay events */
	TP_HKEY_EV_OPTDRV_EJ		= 0x3006, /* opt. drive tray ejected */
	TP_HKEY_EV_HOTPLUG_DOCK		= 0x4010, /* docked into hotplug dock
						     or port replicator */
	TP_HKEY_EV_HOTPLUG_UNDOCK	= 0x4011, /* undocked from hotplug
						     dock or port replicator */

	/* User-interface events */
	TP_HKEY_EV_LID_CLOSE		= 0x5001, /* laptop lid closed */
	TP_HKEY_EV_LID_OPEN		= 0x5002, /* laptop lid opened */
	TP_HKEY_EV_TABLET_TABLET	= 0x5009, /* tablet swivel up */
	TP_HKEY_EV_TABLET_NOTEBOOK	= 0x500a, /* tablet swivel down */
	TP_HKEY_EV_PEN_INSERTED		= 0x500b, /* tablet pen inserted */
	TP_HKEY_EV_PEN_REMOVED		= 0x500c, /* tablet pen removed */
	TP_HKEY_EV_BRGHT_CHANGED	= 0x5010, /* backlight control event */

	/* Key-related user-interface events */
	TP_HKEY_EV_KEY_NUMLOCK		= 0x6000, /* NumLock key pressed */
	TP_HKEY_EV_KEY_FN		= 0x6005, /* Fn key pressed? E420 */
	TP_HKEY_EV_KEY_FN_ESC           = 0x6060, /* Fn+Esc key pressed X240 */

	/* Thermal events */
	TP_HKEY_EV_ALARM_BAT_HOT	= 0x6011, /* battery too hot */
	TP_HKEY_EV_ALARM_BAT_XHOT	= 0x6012, /* battery critically hot */
	TP_HKEY_EV_ALARM_SENSOR_HOT	= 0x6021, /* sensor too hot */
	TP_HKEY_EV_ALARM_SENSOR_XHOT	= 0x6022, /* sensor critically hot */
	TP_HKEY_EV_THM_TABLE_CHANGED	= 0x6030, /* thermal table changed */

	/* AC-related events */
	TP_HKEY_EV_AC_CHANGED		= 0x6040, /* AC status changed */

	/* Misc */
	TP_HKEY_EV_RFKILL_CHANGED	= 0x7000, /* rfkill switch changed */
};

/****************************************************************************
 * Main driver
 */

#define TPACPI_NAME "thinkpad"
#define TPACPI_DESC "ThinkPad ACPI Extras"
#define TPACPI_FILE TPACPI_NAME "_acpi"
#define TPACPI_URL "http://ibm-acpi.sf.net/"
#define TPACPI_MAIL "ibm-acpi-devel@lists.sourceforge.net"

#define TPACPI_PROC_DIR "ibm"
#define TPACPI_ACPI_EVENT_PREFIX "ibm"
#define TPACPI_DRVR_NAME TPACPI_FILE
#define TPACPI_DRVR_SHORTNAME "tpacpi"
#define TPACPI_HWMON_DRVR_NAME TPACPI_NAME "_hwmon"

#define TPACPI_NVRAM_KTHREAD_NAME "ktpacpi_nvramd"
#define TPACPI_WORKQUEUE_NAME "ktpacpid"

#define TPACPI_MAX_ACPI_ARGS 3

/* Debugging printk groups */
#define TPACPI_DBG_ALL		0xffff
#define TPACPI_DBG_DISCLOSETASK	0x8000
#define TPACPI_DBG_INIT		0x0001
#define TPACPI_DBG_EXIT		0x0002
#define TPACPI_DBG_RFKILL	0x0004
#define TPACPI_DBG_HKEY		0x0008
#define TPACPI_DBG_FAN		0x0010
#define TPACPI_DBG_BRGHT	0x0020
#define TPACPI_DBG_MIXER	0x0040

#define onoff(status, bit) ((status) & (1 << (bit)) ? "on" : "off")
#define enabled(status, bit) ((status) & (1 << (bit)) ? "enabled" : "disabled")
#define strlencmp(a, b) (strncmp((a), (b), strlen(b)))


/****************************************************************************
 * Driver-wide structs and misc. variables
 */

struct ibm_struct;

struct tp_acpi_drv_struct {
	const struct acpi_device_id *hid;
	struct acpi_driver *driver;

	void (*notify) (struct ibm_struct *, u32);
	acpi_handle *handle;
	u32 type;
	struct acpi_device *device;
};

struct ibm_struct {
	char *name;

	int (*read) (struct seq_file *);
	int (*write) (char *);
	void (*exit) (void);
	void (*resume) (void);
	void (*suspend) (void);
	void (*shutdown) (void);

	struct list_head all_drivers;

	struct tp_acpi_drv_struct *acpi;

	struct {
		u8 acpi_driver_registered:1;
		u8 acpi_notify_installed:1;
		u8 proc_created:1;
		u8 init_called:1;
		u8 experimental:1;
	} flags;
};

struct ibm_init_struct {
	char param[32];

	int (*init) (struct ibm_init_struct *);
	umode_t base_procfs_mode;
	struct ibm_struct *data;
};

static struct {
	u32 bluetooth:1;
	u32 hotkey:1;
	u32 hotkey_mask:1;
	u32 hotkey_wlsw:1;
	u32 hotkey_tablet:1;
	u32 kbdlight:1;
	u32 light:1;
	u32 light_status:1;
	u32 bright_acpimode:1;
	u32 bright_unkfw:1;
	u32 wan:1;
	u32 uwb:1;
	u32 fan_ctrl_status_undef:1;
	u32 second_fan:1;
	u32 beep_needs_two_args:1;
	u32 mixer_no_level_control:1;
	u32 input_device_registered:1;
	u32 platform_drv_registered:1;
	u32 platform_drv_attrs_registered:1;
	u32 sensors_pdrv_registered:1;
	u32 sensors_pdrv_attrs_registered:1;
	u32 sensors_pdev_attrs_registered:1;
	u32 hotkey_poll_active:1;
	u32 has_adaptive_kbd:1;
} tp_features;

static struct {
	u16 hotkey_mask_ff:1;
	u16 volume_ctrl_forbidden:1;
} tp_warned;

struct thinkpad_id_data {
	unsigned int vendor;	/* ThinkPad vendor:
				 * PCI_VENDOR_ID_IBM/PCI_VENDOR_ID_LENOVO */

	char *bios_version_str;	/* Something like 1ZET51WW (1.03z) */
	char *ec_version_str;	/* Something like 1ZHT51WW-1.04a */

	u16 bios_model;		/* 1Y = 0x5931, 0 = unknown */
	u16 ec_model;
	u16 bios_release;	/* 1ZETK1WW = 0x314b, 0 = unknown */
	u16 ec_release;

	char *model_str;	/* ThinkPad T43 */
	char *nummodel_str;	/* 9384A9C for a 9384-A9C model */
};
static struct thinkpad_id_data thinkpad_id;

static enum {
	TPACPI_LIFE_INIT = 0,
	TPACPI_LIFE_RUNNING,
	TPACPI_LIFE_EXITING,
} tpacpi_lifecycle;

static int experimental;
static u32 dbg_level;

static struct workqueue_struct *tpacpi_wq;

enum led_status_t {
	TPACPI_LED_OFF = 0,
	TPACPI_LED_ON,
	TPACPI_LED_BLINK,
};

/* Special LED class that can defer work */
struct tpacpi_led_classdev {
	struct led_classdev led_classdev;
	struct work_struct work;
	enum led_status_t new_state;
	int led;
};

/* brightness level capabilities */
static unsigned int bright_maxlvl;	/* 0 = unknown */

#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
static int dbg_wlswemul;
static bool tpacpi_wlsw_emulstate;
static int dbg_bluetoothemul;
static bool tpacpi_bluetooth_emulstate;
static int dbg_wwanemul;
static bool tpacpi_wwan_emulstate;
static int dbg_uwbemul;
static bool tpacpi_uwb_emulstate;
#endif


/*************************************************************************
 *  Debugging helpers
 */

#define dbg_printk(a_dbg_level, format, arg...)				\
do {									\
	if (dbg_level & (a_dbg_level))					\
		printk(KERN_DEBUG pr_fmt("%s: " format),		\
		       __func__, ##arg);				\
} while (0)

#ifdef CONFIG_THINKPAD_ACPI_DEBUG
#define vdbg_printk dbg_printk
static const char *str_supported(int is_supported);
#else
static inline const char *str_supported(int is_supported) { return ""; }
#define vdbg_printk(a_dbg_level, format, arg...)	\
	do { if (0) no_printk(format, ##arg); } while (0)
#endif

static void tpacpi_log_usertask(const char * const what)
{
	printk(KERN_DEBUG pr_fmt("%s: access by process with PID %d\n"),
	       what, task_tgid_vnr(current));
}

#define tpacpi_disclose_usertask(what, format, arg...)			\
do {									\
	if (unlikely((dbg_level & TPACPI_DBG_DISCLOSETASK) &&		\
		     (tpacpi_lifecycle == TPACPI_LIFE_RUNNING))) {	\
		printk(KERN_DEBUG pr_fmt("%s: PID %d: " format),	\
		       what, task_tgid_vnr(current), ## arg);		\
	}								\
} while (0)

/*
 * Quirk handling helpers
 *
 * ThinkPad IDs and versions seen in the field so far
 * are two-characters from the set [0-9A-Z], i.e. base 36.
 *
 * We use values well outside that range as specials.
 */

#define TPACPI_MATCH_ANY		0xffffU
#define TPACPI_MATCH_UNKNOWN		0U

/* TPID('1', 'Y') == 0x5931 */
#define TPID(__c1, __c2) (((__c2) << 8) | (__c1))

#define TPACPI_Q_IBM(__id1, __id2, __quirk)	\
	{ .vendor = PCI_VENDOR_ID_IBM,		\
	  .bios = TPID(__id1, __id2),		\
	  .ec = TPACPI_MATCH_ANY,		\
	  .quirks = (__quirk) }

#define TPACPI_Q_LNV(__id1, __id2, __quirk)	\
	{ .vendor = PCI_VENDOR_ID_LENOVO,	\
	  .bios = TPID(__id1, __id2),		\
	  .ec = TPACPI_MATCH_ANY,		\
	  .quirks = (__quirk) }

#define TPACPI_QEC_LNV(__id1, __id2, __quirk)	\
	{ .vendor = PCI_VENDOR_ID_LENOVO,	\
	  .bios = TPACPI_MATCH_ANY,		\
	  .ec = TPID(__id1, __id2),		\
	  .quirks = (__quirk) }

struct tpacpi_quirk {
	unsigned int vendor;
	u16 bios;
	u16 ec;
	unsigned long quirks;
};

/**
 * tpacpi_check_quirks() - search BIOS/EC version on a list
 * @qlist:		array of &struct tpacpi_quirk
 * @qlist_size:		number of elements in @qlist
 *
 * Iterates over a quirks list until one is found that matches the
 * ThinkPad's vendor, BIOS and EC model.
 *
 * Returns 0 if nothing matches, otherwise returns the quirks field of
 * the matching &struct tpacpi_quirk entry.
 *
 * The match criteria is: vendor, ec and bios much match.
 */
static unsigned long __init tpacpi_check_quirks(
			const struct tpacpi_quirk *qlist,
			unsigned int qlist_size)
{
	while (qlist_size) {
		if ((qlist->vendor == thinkpad_id.vendor ||
				qlist->vendor == TPACPI_MATCH_ANY) &&
		    (qlist->bios == thinkpad_id.bios_model ||
				qlist->bios == TPACPI_MATCH_ANY) &&
		    (qlist->ec == thinkpad_id.ec_model ||
				qlist->ec == TPACPI_MATCH_ANY))
			return qlist->quirks;

		qlist_size--;
		qlist++;
	}
	return 0;
}

static inline bool __pure __init tpacpi_is_lenovo(void)
{
	return thinkpad_id.vendor == PCI_VENDOR_ID_LENOVO;
}

static inline bool __pure __init tpacpi_is_ibm(void)
{
	return thinkpad_id.vendor == PCI_VENDOR_ID_IBM;
}

/****************************************************************************
 ****************************************************************************
 *
 * ACPI Helpers and device model
 *
 ****************************************************************************
 ****************************************************************************/

/*************************************************************************
 * ACPI basic handles
 */

static acpi_handle root_handle;
static acpi_handle ec_handle;

#define TPACPI_HANDLE(object, parent, paths...)			\
	static acpi_handle  object##_handle;			\
	static const acpi_handle * const object##_parent __initconst =	\
						&parent##_handle; \
	static char *object##_paths[] __initdata = { paths }

TPACPI_HANDLE(ecrd, ec, "ECRD");	/* 570 */
TPACPI_HANDLE(ecwr, ec, "ECWR");	/* 570 */

TPACPI_HANDLE(cmos, root, "\\UCMS",	/* R50, R50e, R50p, R51, */
					/* T4x, X31, X40 */
	   "\\CMOS",		/* A3x, G4x, R32, T23, T30, X22-24, X30 */
	   "\\CMS",		/* R40, R40e */
	   );			/* all others */

TPACPI_HANDLE(hkey, ec, "\\_SB.HKEY",	/* 600e/x, 770e, 770x */
	   "^HKEY",		/* R30, R31 */
	   "HKEY",		/* all others */
	   );			/* 570 */

/*************************************************************************
 * ACPI helpers
 */

static int acpi_evalf(acpi_handle handle,
		      int *res, char *method, char *fmt, ...)
{
	char *fmt0 = fmt;
	struct acpi_object_list params;
	union acpi_object in_objs[TPACPI_MAX_ACPI_ARGS];
	struct acpi_buffer result, *resultp;
	union acpi_object out_obj;
	acpi_status status;
	va_list ap;
	char res_type;
	int success;
	int quiet;

	if (!*fmt) {
		pr_err("acpi_evalf() called with empty format\n");
		return 0;
	}

	if (*fmt == 'q') {
		quiet = 1;
		fmt++;
	} else
		quiet = 0;

	res_type = *(fmt++);

	params.count = 0;
	params.pointer = &in_objs[0];

	va_start(ap, fmt);
	while (*fmt) {
		char c = *(fmt++);
		switch (c) {
		case 'd':	/* int */
			in_objs[params.count].integer.value = va_arg(ap, int);
			in_objs[params.count++].type = ACPI_TYPE_INTEGER;
			break;
			/* add more types as needed */
		default:
			pr_err("acpi_evalf() called "
			       "with invalid format character '%c'\n", c);
			va_end(ap);
			return 0;
		}
	}
	va_end(ap);

	if (res_type != 'v') {
		result.length = sizeof(out_obj);
		result.pointer = &out_obj;
		resultp = &result;
	} else
		resultp = NULL;

	status = acpi_evaluate_object(handle, method, &params, resultp);

	switch (res_type) {
	case 'd':		/* int */
		success = (status == AE_OK &&
			   out_obj.type == ACPI_TYPE_INTEGER);
		if (success && res)
			*res = out_obj.integer.value;
		break;
	case 'v':		/* void */
		success = status == AE_OK;
		break;
		/* add more types as needed */
	default:
		pr_err("acpi_evalf() called "
		       "with invalid format character '%c'\n", res_type);
		return 0;
	}

	if (!success && !quiet)
		pr_err("acpi_evalf(%s, %s, ...) failed: %s\n",
		       method, fmt0, acpi_format_exception(status));

	return success;
}

static int acpi_ec_read(int i, u8 *p)
{
	int v;

	if (ecrd_handle) {
		if (!acpi_evalf(ecrd_handle, &v, NULL, "dd", i))
			return 0;
		*p = v;
	} else {
		if (ec_read(i, p) < 0)
			return 0;
	}

	return 1;
}

static int acpi_ec_write(int i, u8 v)
{
	if (ecwr_handle) {
		if (!acpi_evalf(ecwr_handle, NULL, NULL, "vdd", i, v))
			return 0;
	} else {
		if (ec_write(i, v) < 0)
			return 0;
	}

	return 1;
}

static int issue_thinkpad_cmos_command(int cmos_cmd)
{
	if (!cmos_handle)
		return -ENXIO;

	if (!acpi_evalf(cmos_handle, NULL, NULL, "vd", cmos_cmd))
		return -EIO;

	return 0;
}

/*************************************************************************
 * ACPI device model
 */

#define TPACPI_ACPIHANDLE_INIT(object) \
	drv_acpi_handle_init(#object, &object##_handle, *object##_parent, \
		object##_paths, ARRAY_SIZE(object##_paths))

static void __init drv_acpi_handle_init(const char *name,
			   acpi_handle *handle, const acpi_handle parent,
			   char **paths, const int num_paths)
{
	int i;
	acpi_status status;

	vdbg_printk(TPACPI_DBG_INIT, "trying to locate ACPI handle for %s\n",
		name);

	for (i = 0; i < num_paths; i++) {
		status = acpi_get_handle(parent, paths[i], handle);
		if (ACPI_SUCCESS(status)) {
			dbg_printk(TPACPI_DBG_INIT,
				   "Found ACPI handle %s for %s\n",
				   paths[i], name);
			return;
		}
	}

	vdbg_printk(TPACPI_DBG_INIT, "ACPI handle for %s not found\n",
		    name);
	*handle = NULL;
}

static acpi_status __init tpacpi_acpi_handle_locate_callback(acpi_handle handle,
			u32 level, void *context, void **return_value)
{
	struct acpi_device *dev;
	if (!strcmp(context, "video")) {
		if (acpi_bus_get_device(handle, &dev))
			return AE_OK;
		if (strcmp(ACPI_VIDEO_HID, acpi_device_hid(dev)))
			return AE_OK;
	}

	*(acpi_handle *)return_value = handle;

	return AE_CTRL_TERMINATE;
}

static void __init tpacpi_acpi_handle_locate(const char *name,
		const char *hid,
		acpi_handle *handle)
{
	acpi_status status;
	acpi_handle device_found;

	BUG_ON(!name || !handle);
	vdbg_printk(TPACPI_DBG_INIT,
			"trying to locate ACPI handle for %s, using HID %s\n",
			name, hid ? hid : "NULL");

	memset(&device_found, 0, sizeof(device_found));
	status = acpi_get_devices(hid, tpacpi_acpi_handle_locate_callback,
				  (void *)name, &device_found);

	*handle = NULL;

	if (ACPI_SUCCESS(status)) {
		*handle = device_found;
		dbg_printk(TPACPI_DBG_INIT,
			   "Found ACPI handle for %s\n", name);
	} else {
		vdbg_printk(TPACPI_DBG_INIT,
			    "Could not locate an ACPI handle for %s: %s\n",
			    name, acpi_format_exception(status));
	}
}

static void dispatch_acpi_notify(acpi_handle handle, u32 event, void *data)
{
	struct ibm_struct *ibm = data;

	if (tpacpi_lifecycle != TPACPI_LIFE_RUNNING)
		return;

	if (!ibm || !ibm->acpi || !ibm->acpi->notify)
		return;

	ibm->acpi->notify(ibm, event);
}

static int __init setup_acpi_notify(struct ibm_struct *ibm)
{
	acpi_status status;
	int rc;

	BUG_ON(!ibm->acpi);

	if (!*ibm->acpi->handle)
		return 0;

	vdbg_printk(TPACPI_DBG_INIT,
		"setting up ACPI notify for %s\n", ibm->name);

	rc = acpi_bus_get_device(*ibm->acpi->handle, &ibm->acpi->device);
	if (rc < 0) {
		pr_err("acpi_bus_get_device(%s) failed: %d\n", ibm->name, rc);
		return -ENODEV;
	}

	ibm->acpi->device->driver_data = ibm;
	sprintf(acpi_device_class(ibm->acpi->device), "%s/%s",
		TPACPI_ACPI_EVENT_PREFIX,
		ibm->name);

	status = acpi_install_notify_handler(*ibm->acpi->handle,
			ibm->acpi->type, dispatch_acpi_notify, ibm);
	if (ACPI_FAILURE(status)) {
		if (status == AE_ALREADY_EXISTS) {
			pr_notice("another device driver is already "
				  "handling %s events\n", ibm->name);
		} else {
			pr_err("acpi_install_notify_handler(%s) failed: %s\n",
			       ibm->name, acpi_format_exception(status));
		}
		return -ENODEV;
	}
	ibm->flags.acpi_notify_installed = 1;
	return 0;
}

static int __init tpacpi_device_add(struct acpi_device *device)
{
	return 0;
}

static int __init register_tpacpi_subdriver(struct ibm_struct *ibm)
{
	int rc;

	dbg_printk(TPACPI_DBG_INIT,
		"registering %s as an ACPI driver\n", ibm->name);

	BUG_ON(!ibm->acpi);

	ibm->acpi->driver = kzalloc(sizeof(struct acpi_driver), GFP_KERNEL);
	if (!ibm->acpi->driver) {
		pr_err("failed to allocate memory for ibm->acpi->driver\n");
		return -ENOMEM;
	}

	sprintf(ibm->acpi->driver->name, "%s_%s", TPACPI_NAME, ibm->name);
	ibm->acpi->driver->ids = ibm->acpi->hid;

	ibm->acpi->driver->ops.add = &tpacpi_device_add;

	rc = acpi_bus_register_driver(ibm->acpi->driver);
	if (rc < 0) {
		pr_err("acpi_bus_register_driver(%s) failed: %d\n",
		       ibm->name, rc);
		kfree(ibm->acpi->driver);
		ibm->acpi->driver = NULL;
	} else if (!rc)
		ibm->flags.acpi_driver_registered = 1;

	return rc;
}


/****************************************************************************
 ****************************************************************************
 *
 * Procfs Helpers
 *
 ****************************************************************************
 ****************************************************************************/

static int dispatch_proc_show(struct seq_file *m, void *v)
{
	struct ibm_struct *ibm = m->private;

	if (!ibm || !ibm->read)
		return -EINVAL;
	return ibm->read(m);
}

static int dispatch_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, dispatch_proc_show, PDE_DATA(inode));
}

static ssize_t dispatch_proc_write(struct file *file,
			const char __user *userbuf,
			size_t count, loff_t *pos)
{
	struct ibm_struct *ibm = PDE_DATA(file_inode(file));
	char *kernbuf;
	int ret;

	if (!ibm || !ibm->write)
		return -EINVAL;
	if (count > PAGE_SIZE - 2)
		return -EINVAL;

	kernbuf = kmalloc(count + 2, GFP_KERNEL);
	if (!kernbuf)
		return -ENOMEM;

	if (copy_from_user(kernbuf, userbuf, count)) {
		kfree(kernbuf);
		return -EFAULT;
	}

	kernbuf[count] = 0;
	strcat(kernbuf, ",");
	ret = ibm->write(kernbuf);
	if (ret == 0)
		ret = count;

	kfree(kernbuf);

	return ret;
}

static const struct file_operations dispatch_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= dispatch_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= dispatch_proc_write,
};

static char *next_cmd(char **cmds)
{
	char *start = *cmds;
	char *end;

	while ((end = strchr(start, ',')) && end == start)
		start = end + 1;

	if (!end)
		return NULL;

	*end = 0;
	*cmds = end + 1;
	return start;
}


/****************************************************************************
 ****************************************************************************
 *
 * Device model: input, hwmon and platform
 *
 ****************************************************************************
 ****************************************************************************/

static struct platform_device *tpacpi_pdev;
static struct platform_device *tpacpi_sensors_pdev;
static struct device *tpacpi_hwmon;
static struct input_dev *tpacpi_inputdev;
static struct mutex tpacpi_inputdev_send_mutex;
static LIST_HEAD(tpacpi_all_drivers);

#ifdef CONFIG_PM_SLEEP
static int tpacpi_suspend_handler(struct device *dev)
{
	struct ibm_struct *ibm, *itmp;

	list_for_each_entry_safe(ibm, itmp,
				 &tpacpi_all_drivers,
				 all_drivers) {
		if (ibm->suspend)
			(ibm->suspend)();
	}

	return 0;
}

static int tpacpi_resume_handler(struct device *dev)
{
	struct ibm_struct *ibm, *itmp;

	list_for_each_entry_safe(ibm, itmp,
				 &tpacpi_all_drivers,
				 all_drivers) {
		if (ibm->resume)
			(ibm->resume)();
	}

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(tpacpi_pm,
			 tpacpi_suspend_handler, tpacpi_resume_handler);

static void tpacpi_shutdown_handler(struct platform_device *pdev)
{
	struct ibm_struct *ibm, *itmp;

	list_for_each_entry_safe(ibm, itmp,
				 &tpacpi_all_drivers,
				 all_drivers) {
		if (ibm->shutdown)
			(ibm->shutdown)();
	}
}

static struct platform_driver tpacpi_pdriver = {
	.driver = {
		.name = TPACPI_DRVR_NAME,
		.pm = &tpacpi_pm,
	},
	.shutdown = tpacpi_shutdown_handler,
};

static struct platform_driver tpacpi_hwmon_pdriver = {
	.driver = {
		.name = TPACPI_HWMON_DRVR_NAME,
	},
};

/*************************************************************************
 * sysfs support helpers
 */

struct attribute_set {
	unsigned int members, max_members;
	struct attribute_group group;
};

struct attribute_set_obj {
	struct attribute_set s;
	struct attribute *a;
} __attribute__((packed));

static struct attribute_set *create_attr_set(unsigned int max_members,
						const char *name)
{
	struct attribute_set_obj *sobj;

	if (max_members == 0)
		return NULL;

	/* Allocates space for implicit NULL at the end too */
	sobj = kzalloc(sizeof(struct attribute_set_obj) +
		    max_members * sizeof(struct attribute *),
		    GFP_KERNEL);
	if (!sobj)
		return NULL;
	sobj->s.max_members = max_members;
	sobj->s.group.attrs = &sobj->a;
	sobj->s.group.name = name;

	return &sobj->s;
}

#define destroy_attr_set(_set) \
	kfree(_set);

/* not multi-threaded safe, use it in a single thread per set */
static int add_to_attr_set(struct attribute_set *s, struct attribute *attr)
{
	if (!s || !attr)
		return -EINVAL;

	if (s->members >= s->max_members)
		return -ENOMEM;

	s->group.attrs[s->members] = attr;
	s->members++;

	return 0;
}

static int add_many_to_attr_set(struct attribute_set *s,
			struct attribute **attr,
			unsigned int count)
{
	int i, res;

	for (i = 0; i < count; i++) {
		res = add_to_attr_set(s, attr[i]);
		if (res)
			return res;
	}

	return 0;
}

static void delete_attr_set(struct attribute_set *s, struct kobject *kobj)
{
	sysfs_remove_group(kobj, &s->group);
	destroy_attr_set(s);
}

#define register_attr_set_with_sysfs(_attr_set, _kobj) \
	sysfs_create_group(_kobj, &_attr_set->group)

static int parse_strtoul(const char *buf,
		unsigned long max, unsigned long *value)
{
	char *endp;

	*value = simple_strtoul(skip_spaces(buf), &endp, 0);
	endp = skip_spaces(endp);
	if (*endp || *value > max)
		return -EINVAL;

	return 0;
}

static void tpacpi_disable_brightness_delay(void)
{
	if (acpi_evalf(hkey_handle, NULL, "PWMS", "qvd", 0))
		pr_notice("ACPI backlight control delay disabled\n");
}

static void printk_deprecated_attribute(const char * const what,
					const char * const details)
{
	tpacpi_log_usertask("deprecated sysfs attribute");
	pr_warn("WARNING: sysfs attribute %s is deprecated and "
		"will be removed. %s\n",
		what, details);
}

/*************************************************************************
 * rfkill and radio control support helpers
 */

/*
 * ThinkPad-ACPI firmware handling model:
 *
 * WLSW (master wireless switch) is event-driven, and is common to all
 * firmware-controlled radios.  It cannot be controlled, just monitored,
 * as expected.  It overrides all radio state in firmware
 *
 * The kernel, a masked-off hotkey, and WLSW can change the radio state
 * (TODO: verify how WLSW interacts with the returned radio state).
 *
 * The only time there are shadow radio state changes, is when
 * masked-off hotkeys are used.
 */

/*
 * Internal driver API for radio state:
 *
 * int: < 0 = error, otherwise enum tpacpi_rfkill_state
 * bool: true means radio blocked (off)
 */
enum tpacpi_rfkill_state {
	TPACPI_RFK_RADIO_OFF = 0,
	TPACPI_RFK_RADIO_ON
};

/* rfkill switches */
enum tpacpi_rfk_id {
	TPACPI_RFK_BLUETOOTH_SW_ID = 0,
	TPACPI_RFK_WWAN_SW_ID,
	TPACPI_RFK_UWB_SW_ID,
	TPACPI_RFK_SW_MAX
};

static const char *tpacpi_rfkill_names[] = {
	[TPACPI_RFK_BLUETOOTH_SW_ID] = "bluetooth",
	[TPACPI_RFK_WWAN_SW_ID] = "wwan",
	[TPACPI_RFK_UWB_SW_ID] = "uwb",
	[TPACPI_RFK_SW_MAX] = NULL
};

/* ThinkPad-ACPI rfkill subdriver */
struct tpacpi_rfk {
	struct rfkill *rfkill;
	enum tpacpi_rfk_id id;
	const struct tpacpi_rfk_ops *ops;
};

struct tpacpi_rfk_ops {
	/* firmware interface */
	int (*get_status)(void);
	int (*set_status)(const enum tpacpi_rfkill_state);
};

static struct tpacpi_rfk *tpacpi_rfkill_switches[TPACPI_RFK_SW_MAX];

/* Query FW and update rfkill sw state for a given rfkill switch */
static int tpacpi_rfk_update_swstate(const struct tpacpi_rfk *tp_rfk)
{
	int status;

	if (!tp_rfk)
		return -ENODEV;

	status = (tp_rfk->ops->get_status)();
	if (status < 0)
		return status;

	rfkill_set_sw_state(tp_rfk->rfkill,
			    (status == TPACPI_RFK_RADIO_OFF));

	return status;
}

/* Query FW and update rfkill sw state for all rfkill switches */
static void tpacpi_rfk_update_swstate_all(void)
{
	unsigned int i;

	for (i = 0; i < TPACPI_RFK_SW_MAX; i++)
		tpacpi_rfk_update_swstate(tpacpi_rfkill_switches[i]);
}

/*
 * Sync the HW-blocking state of all rfkill switches,
 * do notice it causes the rfkill core to schedule uevents
 */
static void tpacpi_rfk_update_hwblock_state(bool blocked)
{
	unsigned int i;
	struct tpacpi_rfk *tp_rfk;

	for (i = 0; i < TPACPI_RFK_SW_MAX; i++) {
		tp_rfk = tpacpi_rfkill_switches[i];
		if (tp_rfk) {
			if (rfkill_set_hw_state(tp_rfk->rfkill,
						blocked)) {
				/* ignore -- we track sw block */
			}
		}
	}
}

/* Call to get the WLSW state from the firmware */
static int hotkey_get_wlsw(void);

/* Call to query WLSW state and update all rfkill switches */
static bool tpacpi_rfk_check_hwblock_state(void)
{
	int res = hotkey_get_wlsw();
	int hw_blocked;

	/* When unknown or unsupported, we have to assume it is unblocked */
	if (res < 0)
		return false;

	hw_blocked = (res == TPACPI_RFK_RADIO_OFF);
	tpacpi_rfk_update_hwblock_state(hw_blocked);

	return hw_blocked;
}

static int tpacpi_rfk_hook_set_block(void *data, bool blocked)
{
	struct tpacpi_rfk *tp_rfk = data;
	int res;

	dbg_printk(TPACPI_DBG_RFKILL,
		   "request to change radio state to %s\n",
		   blocked ? "blocked" : "unblocked");

	/* try to set radio state */
	res = (tp_rfk->ops->set_status)(blocked ?
				TPACPI_RFK_RADIO_OFF : TPACPI_RFK_RADIO_ON);

	/* and update the rfkill core with whatever the FW really did */
	tpacpi_rfk_update_swstate(tp_rfk);

	return (res < 0) ? res : 0;
}

static const struct rfkill_ops tpacpi_rfk_rfkill_ops = {
	.set_block = tpacpi_rfk_hook_set_block,
};

static int __init tpacpi_new_rfkill(const enum tpacpi_rfk_id id,
			const struct tpacpi_rfk_ops *tp_rfkops,
			const enum rfkill_type rfktype,
			const char *name,
			const bool set_default)
{
	struct tpacpi_rfk *atp_rfk;
	int res;
	bool sw_state = false;
	bool hw_state;
	int sw_status;

	BUG_ON(id >= TPACPI_RFK_SW_MAX || tpacpi_rfkill_switches[id]);

	atp_rfk = kzalloc(sizeof(struct tpacpi_rfk), GFP_KERNEL);
	if (atp_rfk)
		atp_rfk->rfkill = rfkill_alloc(name,
						&tpacpi_pdev->dev,
						rfktype,
						&tpacpi_rfk_rfkill_ops,
						atp_rfk);
	if (!atp_rfk || !atp_rfk->rfkill) {
		pr_err("failed to allocate memory for rfkill class\n");
		kfree(atp_rfk);
		return -ENOMEM;
	}

	atp_rfk->id = id;
	atp_rfk->ops = tp_rfkops;

	sw_status = (tp_rfkops->get_status)();
	if (sw_status < 0) {
		pr_err("failed to read initial state for %s, error %d\n",
		       name, sw_status);
	} else {
		sw_state = (sw_status == TPACPI_RFK_RADIO_OFF);
		if (set_default) {
			/* try to keep the initial state, since we ask the
			 * firmware to preserve it across S5 in NVRAM */
			rfkill_init_sw_state(atp_rfk->rfkill, sw_state);
		}
	}
	hw_state = tpacpi_rfk_check_hwblock_state();
	rfkill_set_hw_state(atp_rfk->rfkill, hw_state);

	res = rfkill_register(atp_rfk->rfkill);
	if (res < 0) {
		pr_err("failed to register %s rfkill switch: %d\n", name, res);
		rfkill_destroy(atp_rfk->rfkill);
		kfree(atp_rfk);
		return res;
	}

	tpacpi_rfkill_switches[id] = atp_rfk;

	pr_info("rfkill switch %s: radio is %sblocked\n",
		name, (sw_state || hw_state) ? "" : "un");
	return 0;
}

static void tpacpi_destroy_rfkill(const enum tpacpi_rfk_id id)
{
	struct tpacpi_rfk *tp_rfk;

	BUG_ON(id >= TPACPI_RFK_SW_MAX);

	tp_rfk = tpacpi_rfkill_switches[id];
	if (tp_rfk) {
		rfkill_unregister(tp_rfk->rfkill);
		rfkill_destroy(tp_rfk->rfkill);
		tpacpi_rfkill_switches[id] = NULL;
		kfree(tp_rfk);
	}
}

static void printk_deprecated_rfkill_attribute(const char * const what)
{
	printk_deprecated_attribute(what,
			"Please switch to generic rfkill before year 2010");
}

/* sysfs <radio> enable ------------------------------------------------ */
static ssize_t tpacpi_rfk_sysfs_enable_show(const enum tpacpi_rfk_id id,
					    struct device_attribute *attr,
					    char *buf)
{
	int status;

	printk_deprecated_rfkill_attribute(attr->attr.name);

	/* This is in the ABI... */
	if (tpacpi_rfk_check_hwblock_state()) {
		status = TPACPI_RFK_RADIO_OFF;
	} else {
		status = tpacpi_rfk_update_swstate(tpacpi_rfkill_switches[id]);
		if (status < 0)
			return status;
	}

	return snprintf(buf, PAGE_SIZE, "%d\n",
			(status == TPACPI_RFK_RADIO_ON) ? 1 : 0);
}

static ssize_t tpacpi_rfk_sysfs_enable_store(const enum tpacpi_rfk_id id,
			    struct device_attribute *attr,
			    const char *buf, size_t count)
{
	unsigned long t;
	int res;

	printk_deprecated_rfkill_attribute(attr->attr.name);

	if (parse_strtoul(buf, 1, &t))
		return -EINVAL;

	tpacpi_disclose_usertask(attr->attr.name, "set to %ld\n", t);

	/* This is in the ABI... */
	if (tpacpi_rfk_check_hwblock_state() && !!t)
		return -EPERM;

	res = tpacpi_rfkill_switches[id]->ops->set_status((!!t) ?
				TPACPI_RFK_RADIO_ON : TPACPI_RFK_RADIO_OFF);
	tpacpi_rfk_update_swstate(tpacpi_rfkill_switches[id]);

	return (res < 0) ? res : count;
}

/* procfs -------------------------------------------------------------- */
static int tpacpi_rfk_procfs_read(const enum tpacpi_rfk_id id, struct seq_file *m)
{
	if (id >= TPACPI_RFK_SW_MAX)
		seq_printf(m, "status:\t\tnot supported\n");
	else {
		int status;

		/* This is in the ABI... */
		if (tpacpi_rfk_check_hwblock_state()) {
			status = TPACPI_RFK_RADIO_OFF;
		} else {
			status = tpacpi_rfk_update_swstate(
						tpacpi_rfkill_switches[id]);
			if (status < 0)
				return status;
		}

		seq_printf(m, "status:\t\t%s\n",
				(status == TPACPI_RFK_RADIO_ON) ?
					"enabled" : "disabled");
		seq_printf(m, "commands:\tenable, disable\n");
	}

	return 0;
}

static int tpacpi_rfk_procfs_write(const enum tpacpi_rfk_id id, char *buf)
{
	char *cmd;
	int status = -1;
	int res = 0;

	if (id >= TPACPI_RFK_SW_MAX)
		return -ENODEV;

	while ((cmd = next_cmd(&buf))) {
		if (strlencmp(cmd, "enable") == 0)
			status = TPACPI_RFK_RADIO_ON;
		else if (strlencmp(cmd, "disable") == 0)
			status = TPACPI_RFK_RADIO_OFF;
		else
			return -EINVAL;
	}

	if (status != -1) {
		tpacpi_disclose_usertask("procfs", "attempt to %s %s\n",
				(status == TPACPI_RFK_RADIO_ON) ?
						"enable" : "disable",
				tpacpi_rfkill_names[id]);
		res = (tpacpi_rfkill_switches[id]->ops->set_status)(status);
		tpacpi_rfk_update_swstate(tpacpi_rfkill_switches[id]);
	}

	return res;
}

/*************************************************************************
 * thinkpad-acpi driver attributes
 */

/* interface_version --------------------------------------------------- */
static ssize_t tpacpi_driver_interface_version_show(
				struct device_driver *drv,
				char *buf)
{
	return snprintf(buf, PAGE_SIZE, "0x%08x\n", TPACPI_SYSFS_VERSION);
}

static DRIVER_ATTR(interface_version, S_IRUGO,
		tpacpi_driver_interface_version_show, NULL);

/* debug_level --------------------------------------------------------- */
static ssize_t tpacpi_driver_debug_show(struct device_driver *drv,
						char *buf)
{
	return snprintf(buf, PAGE_SIZE, "0x%04x\n", dbg_level);
}

static ssize_t tpacpi_driver_debug_store(struct device_driver *drv,
						const char *buf, size_t count)
{
	unsigned long t;

	if (parse_strtoul(buf, 0xffff, &t))
		return -EINVAL;

	dbg_level = t;

	return count;
}

static DRIVER_ATTR(debug_level, S_IWUSR | S_IRUGO,
		tpacpi_driver_debug_show, tpacpi_driver_debug_store);

/* version ------------------------------------------------------------- */
static ssize_t tpacpi_driver_version_show(struct device_driver *drv,
						char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%s v%s\n",
			TPACPI_DESC, TPACPI_VERSION);
}

static DRIVER_ATTR(version, S_IRUGO,
		tpacpi_driver_version_show, NULL);

/* --------------------------------------------------------------------- */

#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES

/* wlsw_emulstate ------------------------------------------------------ */
static ssize_t tpacpi_driver_wlsw_emulstate_show(struct device_driver *drv,
						char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", !!tpacpi_wlsw_emulstate);
}

static ssize_t tpacpi_driver_wlsw_emulstate_store(struct device_driver *drv,
						const char *buf, size_t count)
{
	unsigned long t;

	if (parse_strtoul(buf, 1, &t))
		return -EINVAL;

	if (tpacpi_wlsw_emulstate != !!t) {
		tpacpi_wlsw_emulstate = !!t;
		tpacpi_rfk_update_hwblock_state(!t);	/* negative logic */
	}

	return count;
}

static DRIVER_ATTR(wlsw_emulstate, S_IWUSR | S_IRUGO,
		tpacpi_driver_wlsw_emulstate_show,
		tpacpi_driver_wlsw_emulstate_store);

/* bluetooth_emulstate ------------------------------------------------- */
static ssize_t tpacpi_driver_bluetooth_emulstate_show(
					struct device_driver *drv,
					char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", !!tpacpi_bluetooth_emulstate);
}

static ssize_t tpacpi_driver_bluetooth_emulstate_store(
					struct device_driver *drv,
					const char *buf, size_t count)
{
	unsigned long t;

	if (parse_strtoul(buf, 1, &t))
		return -EINVAL;

	tpacpi_bluetooth_emulstate = !!t;

	return count;
}

static DRIVER_ATTR(bluetooth_emulstate, S_IWUSR | S_IRUGO,
		tpacpi_driver_bluetooth_emulstate_show,
		tpacpi_driver_bluetooth_emulstate_store);

/* wwan_emulstate ------------------------------------------------- */
static ssize_t tpacpi_driver_wwan_emulstate_show(
					struct device_driver *drv,
					char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", !!tpacpi_wwan_emulstate);
}

static ssize_t tpacpi_driver_wwan_emulstate_store(
					struct device_driver *drv,
					const char *buf, size_t count)
{
	unsigned long t;

	if (parse_strtoul(buf, 1, &t))
		return -EINVAL;

	tpacpi_wwan_emulstate = !!t;

	return count;
}

static DRIVER_ATTR(wwan_emulstate, S_IWUSR | S_IRUGO,
		tpacpi_driver_wwan_emulstate_show,
		tpacpi_driver_wwan_emulstate_store);

/* uwb_emulstate ------------------------------------------------- */
static ssize_t tpacpi_driver_uwb_emulstate_show(
					struct device_driver *drv,
					char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", !!tpacpi_uwb_emulstate);
}

static ssize_t tpacpi_driver_uwb_emulstate_store(
					struct device_driver *drv,
					const char *buf, size_t count)
{
	unsigned long t;

	if (parse_strtoul(buf, 1, &t))
		return -EINVAL;

	tpacpi_uwb_emulstate = !!t;

	return count;
}

static DRIVER_ATTR(uwb_emulstate, S_IWUSR | S_IRUGO,
		tpacpi_driver_uwb_emulstate_show,
		tpacpi_driver_uwb_emulstate_store);
#endif

/* --------------------------------------------------------------------- */

static struct driver_attribute *tpacpi_driver_attributes[] = {
	&driver_attr_debug_level, &driver_attr_version,
	&driver_attr_interface_version,
};

static int __init tpacpi_create_driver_attributes(struct device_driver *drv)
{
	int i, res;

	i = 0;
	res = 0;
	while (!res && i < ARRAY_SIZE(tpacpi_driver_attributes)) {
		res = driver_create_file(drv, tpacpi_driver_attributes[i]);
		i++;
	}

#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
	if (!res && dbg_wlswemul)
		res = driver_create_file(drv, &driver_attr_wlsw_emulstate);
	if (!res && dbg_bluetoothemul)
		res = driver_create_file(drv, &driver_attr_bluetooth_emulstate);
	if (!res && dbg_wwanemul)
		res = driver_create_file(drv, &driver_attr_wwan_emulstate);
	if (!res && dbg_uwbemul)
		res = driver_create_file(drv, &driver_attr_uwb_emulstate);
#endif

	return res;
}

static void tpacpi_remove_driver_attributes(struct device_driver *drv)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(tpacpi_driver_attributes); i++)
		driver_remove_file(drv, tpacpi_driver_attributes[i]);

#ifdef THINKPAD_ACPI_DEBUGFACILITIES
	driver_remove_file(drv, &driver_attr_wlsw_emulstate);
	driver_remove_file(drv, &driver_attr_bluetooth_emulstate);
	driver_remove_file(drv, &driver_attr_wwan_emulstate);
	driver_remove_file(drv, &driver_attr_uwb_emulstate);
#endif
}

/*************************************************************************
 * Firmware Data
 */

/*
 * Table of recommended minimum BIOS versions
 *
 * Reasons for listing:
 *    1. Stable BIOS, listed because the unknown amount of
 *       bugs and bad ACPI behaviour on older versions
 *
 *    2. BIOS or EC fw with known bugs that trigger on Linux
 *
 *    3. BIOS with known reduced functionality in older versions
 *
 *  We recommend the latest BIOS and EC version.
 *  We only support the latest BIOS and EC fw version as a rule.
 *
 *  Sources: IBM ThinkPad Public Web Documents (update changelogs),
 *  Information from users in ThinkWiki
 *
 *  WARNING: we use this table also to detect that the machine is
 *  a ThinkPad in some cases, so don't remove entries lightly.
 */

#define TPV_Q(__v, __id1, __id2, __bv1, __bv2)		\
	{ .vendor	= (__v),			\
	  .bios		= TPID(__id1, __id2),		\
	  .ec		= TPACPI_MATCH_ANY,		\
	  .quirks	= TPACPI_MATCH_ANY << 16	\
			  | (__bv1) << 8 | (__bv2) }

#define TPV_Q_X(__v, __bid1, __bid2, __bv1, __bv2,	\
		__eid, __ev1, __ev2)			\
	{ .vendor	= (__v),			\
	  .bios		= TPID(__bid1, __bid2),		\
	  .ec		= __eid,			\
	  .quirks	= (__ev1) << 24 | (__ev2) << 16 \
			  | (__bv1) << 8 | (__bv2) }

#define TPV_QI0(__id1, __id2, __bv1, __bv2) \
	TPV_Q(PCI_VENDOR_ID_IBM, __id1, __id2, __bv1, __bv2)

/* Outdated IBM BIOSes often lack the EC id string */
#define TPV_QI1(__id1, __id2, __bv1, __bv2, __ev1, __ev2) \
	TPV_Q_X(PCI_VENDOR_ID_IBM, __id1, __id2, 	\
		__bv1, __bv2, TPID(__id1, __id2),	\
		__ev1, __ev2),				\
	TPV_Q_X(PCI_VENDOR_ID_IBM, __id1, __id2, 	\
		__bv1, __bv2, TPACPI_MATCH_UNKNOWN,	\
		__ev1, __ev2)

/* Outdated IBM BIOSes often lack the EC id string */
#define TPV_QI2(__bid1, __bid2, __bv1, __bv2,		\
		__eid1, __eid2, __ev1, __ev2) 		\
	TPV_Q_X(PCI_VENDOR_ID_IBM, __bid1, __bid2, 	\
		__bv1, __bv2, TPID(__eid1, __eid2),	\
		__ev1, __ev2),				\
	TPV_Q_X(PCI_VENDOR_ID_IBM, __bid1, __bid2, 	\
		__bv1, __bv2, TPACPI_MATCH_UNKNOWN,	\
		__ev1, __ev2)

#define TPV_QL0(__id1, __id2, __bv1, __bv2) \
	TPV_Q(PCI_VENDOR_ID_LENOVO, __id1, __id2, __bv1, __bv2)

#define TPV_QL1(__id1, __id2, __bv1, __bv2, __ev1, __ev2) \
	TPV_Q_X(PCI_VENDOR_ID_LENOVO, __id1, __id2, 	\
		__bv1, __bv2, TPID(__id1, __id2),	\
		__ev1, __ev2)

#define TPV_QL2(__bid1, __bid2, __bv1, __bv2,		\
		__eid1, __eid2, __ev1, __ev2) 		\
	TPV_Q_X(PCI_VENDOR_ID_LENOVO, __bid1, __bid2, 	\
		__bv1, __bv2, TPID(__eid1, __eid2),	\
		__ev1, __ev2)

static const struct tpacpi_quirk tpacpi_bios_version_qtable[] __initconst = {
	/*  Numeric models ------------------ */
	/*      FW MODEL   BIOS VERS	      */
	TPV_QI0('I', 'M',  '6', '5'),		 /* 570 */
	TPV_QI0('I', 'U',  '2', '6'),		 /* 570E */
	TPV_QI0('I', 'B',  '5', '4'),		 /* 600 */
	TPV_QI0('I', 'H',  '4', '7'),		 /* 600E */
	TPV_QI0('I', 'N',  '3', '6'),		 /* 600E */
	TPV_QI0('I', 'T',  '5', '5'),		 /* 600X */
	TPV_QI0('I', 'D',  '4', '8'),		 /* 770, 770E, 770ED */
	TPV_QI0('I', 'I',  '4', '2'),		 /* 770X */
	TPV_QI0('I', 'O',  '2', '3'),		 /* 770Z */

	/* A-series ------------------------- */
	/*      FW MODEL   BIOS VERS  EC VERS */
	TPV_QI0('I', 'W',  '5', '9'),		 /* A20m */
	TPV_QI0('I', 'V',  '6', '9'),		 /* A20p */
	TPV_QI0('1', '0',  '2', '6'),		 /* A21e, A22e */
	TPV_QI0('K', 'U',  '3', '6'),		 /* A21e */
	TPV_QI0('K', 'X',  '3', '6'),		 /* A21m, A22m */
	TPV_QI0('K', 'Y',  '3', '8'),		 /* A21p, A22p */
	TPV_QI0('1', 'B',  '1', '7'),		 /* A22e */
	TPV_QI0('1', '3',  '2', '0'),		 /* A22m */
	TPV_QI0('1', 'E',  '7', '3'),		 /* A30/p (0) */
	TPV_QI1('1', 'G',  '4', '1',  '1', '7'), /* A31/p (0) */
	TPV_QI1('1', 'N',  '1', '6',  '0', '7'), /* A31/p (0) */

	/* G-series ------------------------- */
	/*      FW MODEL   BIOS VERS	      */
	TPV_QI0('1', 'T',  'A', '6'),		 /* G40 */
	TPV_QI0('1', 'X',  '5', '7'),		 /* G41 */

	/* R-series, T-series --------------- */
	/*      FW MODEL   BIOS VERS  EC VERS */
	TPV_QI0('1', 'C',  'F', '0'),		 /* R30 */
	TPV_QI0('1', 'F',  'F', '1'),		 /* R31 */
	TPV_QI0('1', 'M',  '9', '7'),		 /* R32 */
	TPV_QI0('1', 'O',  '6', '1'),		 /* R40 */
	TPV_QI0('1', 'P',  '6', '5'),		 /* R40 */
	TPV_QI0('1', 'S',  '7', '0'),		 /* R40e */
	TPV_QI1('1', 'R',  'D', 'R',  '7', '1'), /* R50/p, R51,
						    T40/p, T41/p, T42/p (1) */
	TPV_QI1('1', 'V',  '7', '1',  '2', '8'), /* R50e, R51 (1) */
	TPV_QI1('7', '8',  '7', '1',  '0', '6'), /* R51e (1) */
	TPV_QI1('7', '6',  '6', '9',  '1', '6'), /* R52 (1) */
	TPV_QI1('7', '0',  '6', '9',  '2', '8'), /* R52, T43 (1) */

	TPV_QI0('I', 'Y',  '6', '1'),		 /* T20 */
	TPV_QI0('K', 'Z',  '3', '4'),		 /* T21 */
	TPV_QI0('1', '6',  '3', '2'),		 /* T22 */
	TPV_QI1('1', 'A',  '6', '4',  '2', '3'), /* T23 (0) */
	TPV_QI1('1', 'I',  '7', '1',  '2', '0'), /* T30 (0) */
	TPV_QI1('1', 'Y',  '6', '5',  '2', '9'), /* T43/p (1) */

	TPV_QL1('7', '9',  'E', '3',  '5', '0'), /* T60/p */
	TPV_QL1('7', 'C',  'D', '2',  '2', '2'), /* R60, R60i */
	TPV_QL1('7', 'E',  'D', '0',  '1', '5'), /* R60e, R60i */

	/*      BIOS FW    BIOS VERS  EC FW     EC VERS */
	TPV_QI2('1', 'W',  '9', '0',  '1', 'V', '2', '8'), /* R50e (1) */
	TPV_QL2('7', 'I',  '3', '4',  '7', '9', '5', '0'), /* T60/p wide */

	/* X-series ------------------------- */
	/*      FW MODEL   BIOS VERS  EC VERS */
	TPV_QI0('I', 'Z',  '9', 'D'),		 /* X20, X21 */
	TPV_QI0('1', 'D',  '7', '0'),		 /* X22, X23, X24 */
	TPV_QI1('1', 'K',  '4', '8',  '1', '8'), /* X30 (0) */
	TPV_QI1('1', 'Q',  '9', '7',  '2', '3'), /* X31, X32 (0) */
	TPV_QI1('1', 'U',  'D', '3',  'B',