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>

/* 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 */

	/* 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 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;
} 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...)	\
	no_printk(format, ##arg)
#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,
		.owner = THIS_MODULE,
		.pm = &tpacpi_pm,
	},
	.shutdown = tpacpi_shutdown_handler,
};

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

/*************************************************************************
 * 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));