// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  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>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#define TPACPI_VERSION "0.26"
#define TPACPI_SYSFS_VERSION 0x030000

/*
 *  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/sched/signal.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/bitops.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.h>
#include <linux/power_supply.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/initval.h>
#include <linux/uaccess.h>
#include <acpi/battery.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_LENOVO_HKEY_V2_HID  "LEN0268"
#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_KBD_LIGHT            = 0x1012, /* Thinklight/kbd backlight */
        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_TABLET_CHANGED       = 0x60c0, /* X1 Yoga (2016):
                                                   * enter/leave tablet mode
                                                   */
        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, /* windows; thermal table changed */
        TP_HKEY_EV_THM_CSM_COMPLETED    = 0x6032, /* windows; thermal control set
                                                   * command completed. Related to
                                                   * AML DYTC */
        TP_HKEY_EV_THM_TRANSFM_CHANGED  = 0x60F0, /* windows; thermal transformation
                                                   * changed. Related to AML GMTS */

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

        /* Further user-interface events */
        TP_HKEY_EV_PALM_DETECTED        = 0x60b0, /* palm hoveres keyboard */
        TP_HKEY_EV_PALM_UNDETECTED      = 0x60b1, /* palm removed */

        /* 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;
        enum {
                TP_HOTKEY_TABLET_NONE = 0,
                TP_HOTKEY_TABLET_USES_MHKG,
                TP_HOTKEY_TABLET_USES_GMMS,
        } hotkey_tablet;
        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 battery_force_primary: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 */

        u32 bios_model;         /* 1Y = 0x3159, 0 = unknown */
        u32 ec_model;
        u16 bios_release;       /* 1ZETK1WW = 0x4b31, 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,
};

/* tpacpi LED class */
struct tpacpi_led_classdev {
        struct led_classdev led_classdev;
        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 or three characters from the set [0-9A-Z], i.e. base 36.
 *
 * We use values well outside that range as specials.
 */

#define TPACPI_MATCH_ANY                0xffffffffU
#define TPACPI_MATCH_ANY_VERSION        0xffffU
#define TPACPI_MATCH_UNKNOWN            0U

/* TPID('1', 'Y') == 0x3159 */
#define TPID(__c1, __c2)        (((__c1) << 8) | (__c2))
#define TPID3(__c1, __c2, __c3) (((__c1) << 16) | ((__c2) << 8) | (__c3))
#define TPVER TPID

#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_Q_LNV3(__id1, __id2, __id3, __quirk) \
        { .vendor = PCI_VENDOR_ID_LENOVO,       \
          .bios = TPID3(__id1, __id2, __id3),   \
          .ec = TPACPI_MATCH_ANY,               \
          .quirks = (__quirk) }

#define TPACPI_QEC_IBM(__id1, __id2, __quirk)   \
        { .vendor = PCI_VENDOR_ID_IBM,          \
          .bios = TPACPI_MATCH_ANY,             \
          .ec = TPID(__id1, __id2),             \
          .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;
        u32 bios;
        u32 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 proc_ops dispatch_proc_ops = {
        .proc_open      = dispatch_proc_open,
        .proc_read      = seq_read,
        .proc_lseek     = seq_lseek,
        .proc_release   = single_release,
        .proc_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 interface_version_show(struct device_driver *drv, char *buf)
{
        return snprintf(buf, PAGE_SIZE, "0x%08x\n", TPACPI_SYSFS_VERSION);
}
static DRIVER_ATTR_RO(interface_version);

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

static ssize_t debug_level_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_RW(debug_level);

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

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

#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES

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

static ssize_t 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_RW(wlsw_emulstate);

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

static ssize_t 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_RW(bluetooth_emulstate);

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

static ssize_t 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_RW(wwan_emulstate);

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

static ssize_t 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_RW(uwb_emulstate);
#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_VERSION << 16 \
                          | TPVER(__bv1, __bv2) }

#define TPV_Q_X(__v, __bid1, __bid2, __bv1, __bv2,      \
                __eid, __ev1, __ev2)                    \
        { .vendor       = (__v),                        \
          .bios         = TPID(__bid1, __bid2),         \
          .ec           = __eid,                        \
          .quirks       = TPVER(__ev1, __ev2) << 16     \
                          | TPVER(__bv1, __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', '2'), /* X40 (0) */
        TPV_QI1('7', '4',  '6', '4',  '2', '7'), /* X41 (0) */
        TPV_QI1('7', '5',  '6', '0',  '2', '0'), /* X41t (0) */

        TPV_QL1('7', 'B',  'D', '7',  '4', '0'), /* X60/s */
        TPV_QL1('7', 'J',  '3', '0',  '1', '3'), /* X60t */

        /* (0) - older versions lack DMI EC fw string and functionality */
        /* (1) - older versions known to lack functionality */
};

#undef TPV_QL1
#undef TPV_QL0
#undef TPV_QI2
#undef TPV_QI1
#undef TPV_QI0
#undef TPV_Q_X
#undef TPV_Q

static void __init tpacpi_check_outdated_fw(void)
{
        unsigned long fwvers;
        u16 ec_version, bios_version;

        fwvers = tpacpi_check_quirks(tpacpi_bios_version_qtable,
                                ARRAY_SIZE(tpacpi_bios_version_qtable));

        if (!fwvers)
                return;

        bios_version = fwvers & 0xffffU;
        ec_version = (fwvers >> 16) & 0xffffU;

        /* note that unknown versions are set to 0x0000 and we use that */
        if ((bios_version > thinkpad_id.bios_release) ||
            (ec_version > thinkpad_id.ec_release &&
                                ec_version != TPACPI_MATCH_ANY_VERSION)) {
                /*
                 * The changelogs would let us track down the exact
                 * reason, but it is just too much of a pain to track
                 * it.  We only list BIOSes that are either really
                 * broken, or really stable to begin with, so it is
                 * best if the user upgrades the firmware anyway.
                 */
                pr_warn("WARNING: Outdated ThinkPad BIOS/EC firmware\n");
                pr_warn("WARNING: This firmware may be missing critical bug fixes and/or important features\n");
        }
}

static bool __init tpacpi_is_fw_known(void)
{
        return tpacpi_check_quirks(tpacpi_bios_version_qtable,
                        ARRAY_SIZE(tpacpi_bios_version_qtable)) != 0;
}

/****************************************************************************
 ****************************************************************************
 *
 * Subdrivers
 *
 ****************************************************************************
 ****************************************************************************/

/*************************************************************************
 * thinkpad-acpi metadata subdriver
 */

static int thinkpad_acpi_driver_read(struct seq_file *m)
{
        seq_printf(m, "driver:\t\t%s\n", TPACPI_DESC);
        seq_printf(m, "version:\t%s\n", TPACPI_VERSION);
        return 0;
}

static struct ibm_struct thinkpad_acpi_driver_data = {
        .name = "driver",
        .read = thinkpad_acpi_driver_read,
};

/*************************************************************************
 * Hotkey subdriver
 */

/*
 * ThinkPad firmware event model
 *
 * The ThinkPad firmware has two main event interfaces: normal ACPI
 * notifications (which follow the ACPI standard), and a private event
 * interface.
 *
 * The private event interface also issues events for the hotkeys.  As
 * the driver gained features, the event handling code ended up being
 * built around the hotkey subdriver.  This will need to be refactored
 * to a more formal event API eventually.
 *
 * Some "hotkeys" are actually supposed to be used as event reports,
 * such as "brightness has changed", "volume has changed", depending on
 * the ThinkPad model and how the firmware is operating.
 *
 * Unlike other classes, hotkey-class events have mask/unmask control on
 * non-ancient firmware.  However, how it behaves changes a lot with the
 * firmware model and version.
 */

enum {  /* hot key scan codes (derived from ACPI DSDT) */
        TP_ACPI_HOTKEYSCAN_FNF1         = 0,
        TP_ACPI_HOTKEYSCAN_FNF2,
        TP_ACPI_HOTKEYSCAN_FNF3,
        TP_ACPI_HOTKEYSCAN_FNF4,
        TP_ACPI_HOTKEYSCAN_FNF5,
        TP_ACPI_HOTKEYSCAN_FNF6,
        TP_ACPI_HOTKEYSCAN_FNF7,
        TP_ACPI_HOTKEYSCAN_FNF8,
        TP_ACPI_HOTKEYSCAN_FNF9,
        TP_ACPI_HOTKEYSCAN_FNF10,
        TP_ACPI_HOTKEYSCAN_FNF11,
        TP_ACPI_HOTKEYSCAN_FNF12,
        TP_ACPI_HOTKEYSCAN_FNBACKSPACE,
        TP_ACPI_HOTKEYSCAN_FNINSERT,
        TP_ACPI_HOTKEYSCAN_FNDELETE,
        TP_ACPI_HOTKEYSCAN_FNHOME,
        TP_ACPI_HOTKEYSCAN_FNEND,
        TP_ACPI_HOTKEYSCAN_FNPAGEUP,
        TP_ACPI_HOTKEYSCAN_FNPAGEDOWN,
        TP_ACPI_HOTKEYSCAN_FNSPACE,
        TP_ACPI_HOTKEYSCAN_VOLUMEUP,
        TP_ACPI_HOTKEYSCAN_VOLUMEDOWN,
        TP_ACPI_HOTKEYSCAN_MUTE,
        TP_ACPI_HOTKEYSCAN_THINKPAD,
        TP_ACPI_HOTKEYSCAN_UNK1,
        TP_ACPI_HOTKEYSCAN_UNK2,
        TP_ACPI_HOTKEYSCAN_UNK3,
        TP_ACPI_HOTKEYSCAN_UNK4,
        TP_ACPI_HOTKEYSCAN_UNK5,
        TP_ACPI_HOTKEYSCAN_UNK6,
        TP_ACPI_HOTKEYSCAN_UNK7,
        TP_ACPI_HOTKEYSCAN_UNK8,

        /* Adaptive keyboard keycodes */
        TP_ACPI_HOTKEYSCAN_ADAPTIVE_START,
        TP_ACPI_HOTKEYSCAN_MUTE2        = TP_ACPI_HOTKEYSCAN_ADAPTIVE_START,
        TP_ACPI_HOTKEYSCAN_BRIGHTNESS_ZERO,
        TP_ACPI_HOTKEYSCAN_CLIPPING_TOOL,
        TP_ACPI_HOTKEYSCAN_CLOUD,
        TP_ACPI_HOTKEYSCAN_UNK9,
        TP_ACPI_HOTKEYSCAN_VOICE,
        TP_ACPI_HOTKEYSCAN_UNK10,
        TP_ACPI_HOTKEYSCAN_GESTURES,
        TP_ACPI_HOTKEYSCAN_UNK11,
        TP_ACPI_HOTKEYSCAN_UNK12,
        TP_ACPI_HOTKEYSCAN_UNK13,
        TP_ACPI_HOTKEYSCAN_CONFIG,
        TP_ACPI_HOTKEYSCAN_NEW_TAB,
        TP_ACPI_HOTKEYSCAN_RELOAD,
        TP_ACPI_HOTKEYSCAN_BACK,
        TP_ACPI_HOTKEYSCAN_MIC_DOWN,
        TP_ACPI_HOTKEYSCAN_MIC_UP,
        TP_ACPI_HOTKEYSCAN_MIC_CANCELLATION,
        TP_ACPI_HOTKEYSCAN_CAMERA_MODE,
        TP_ACPI_HOTKEYSCAN_ROTATE_DISPLAY,

        /* Lenovo extended keymap, starting at 0x1300 */
        TP_ACPI_HOTKEYSCAN_EXTENDED_START,
        /* first new observed key (star, favorites) is 0x1311 */
        TP_ACPI_HOTKEYSCAN_STAR = 69,
        TP_ACPI_HOTKEYSCAN_CLIPPING_TOOL2,
        TP_ACPI_HOTKEYSCAN_CALCULATOR,
        TP_ACPI_HOTKEYSCAN_BLUETOOTH,
        TP_ACPI_HOTKEYSCAN_KEYBOARD,

        /* Hotkey keymap size */
        TPACPI_HOTKEY_MAP_LEN
};

enum {  /* Keys/events available through NVRAM polling */
        TPACPI_HKEY_NVRAM_KNOWN_MASK = 0x00fb88c0U,
        TPACPI_HKEY_NVRAM_GOOD_MASK  = 0x00fb8000U,
};

enum {  /* Positions of some of the keys in hotkey masks */
        TP_ACPI_HKEY_DISPSWTCH_MASK     = 1 << TP_ACPI_HOTKEYSCAN_FNF7,
        TP_ACPI_HKEY_DISPXPAND_MASK     = 1 << TP_ACPI_HOTKEYSCAN_FNF8,
        TP_ACPI_HKEY_HIBERNATE_MASK     = 1 << TP_ACPI_HOTKEYSCAN_FNF12,
        TP_ACPI_HKEY_BRGHTUP_MASK       = 1 << TP_ACPI_HOTKEYSCAN_FNHOME,
        TP_ACPI_HKEY_BRGHTDWN_MASK      = 1 << TP_ACPI_HOTKEYSCAN_FNEND,
        TP_ACPI_HKEY_KBD_LIGHT_MASK     = 1 << TP_ACPI_HOTKEYSCAN_FNPAGEUP,
        TP_ACPI_HKEY_ZOOM_MASK          = 1 << TP_ACPI_HOTKEYSCAN_FNSPACE,
        TP_ACPI_HKEY_VOLUP_MASK         = 1 << TP_ACPI_HOTKEYSCAN_VOLUMEUP,
        TP_ACPI_HKEY_VOLDWN_MASK        = 1 << TP_ACPI_HOTKEYSCAN_VOLUMEDOWN,
        TP_ACPI_HKEY_MUTE_MASK          = 1 << TP_ACPI_HOTKEYSCAN_MUTE,
        TP_ACPI_HKEY_THINKPAD_MASK      = 1 << TP_ACPI_HOTKEYSCAN_THINKPAD,
};

enum {  /* NVRAM to ACPI HKEY group map */
        TP_NVRAM_HKEY_GROUP_HK2         = TP_ACPI_HKEY_THINKPAD_MASK |
                                          TP_ACPI_HKEY_ZOOM_MASK |
                                          TP_ACPI_HKEY_DISPSWTCH_MASK |
                                          TP_ACPI_HKEY_HIBERNATE_MASK,
        TP_NVRAM_HKEY_GROUP_BRIGHTNESS  = TP_ACPI_HKEY_BRGHTUP_MASK |
                                          TP_ACPI_HKEY_BRGHTDWN_MASK,
        TP_NVRAM_HKEY_GROUP_VOLUME      = TP_ACPI_HKEY_VOLUP_MASK |
                                          TP_ACPI_HKEY_VOLDWN_MASK |
                                          TP_ACPI_HKEY_MUTE_MASK,
};

#ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
struct tp_nvram_state {
       u16 thinkpad_toggle:1;
       u16 zoom_toggle:1;
       u16 display_toggle:1;
       u16 thinklight_toggle:1;
       u16 hibernate_toggle:1;
       u16 displayexp_toggle:1;
       u16 display_state:1;
       u16 brightness_toggle:1;
       u16 volume_toggle:1;
       u16 mute:1;

       u8 brightness_level;
       u8 volume_level;
};

/* kthread for the hotkey poller */
static struct task_struct *tpacpi_hotkey_task;

/*
 * Acquire mutex to write poller control variables as an
 * atomic block.
 *
 * Increment hotkey_config_change when changing them if you
 * want the kthread to forget old state.
 *
 * See HOTKEY_CONFIG_CRITICAL_START/HOTKEY_CONFIG_CRITICAL_END
 */
static struct mutex hotkey_thread_data_mutex;
static unsigned int hotkey_config_change;

/*
 * hotkey poller control variables
 *
 * Must be atomic or readers will also need to acquire mutex
 *
 * HOTKEY_CONFIG_CRITICAL_START/HOTKEY_CONFIG_CRITICAL_END
 * should be used only when the changes need to be taken as
 * a block, OR when one needs to force the kthread to forget
 * old state.
 */
static u32 hotkey_source_mask;          /* bit mask 0=ACPI,1=NVRAM */
static unsigned int hotkey_poll_freq = 10; /* Hz */

#define HOTKEY_CONFIG_CRITICAL_START \
        do { \
                mutex_lock(&hotkey_thread_data_mutex); \
                hotkey_config_change++; \
        } while (0);
#define HOTKEY_CONFIG_CRITICAL_END \
        mutex_unlock(&hotkey_thread_data_mutex);

#else /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */

#define hotkey_source_mask 0U
#define HOTKEY_CONFIG_CRITICAL_START
#define HOTKEY_CONFIG_CRITICAL_END

#endif /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */

static struct mutex hotkey_mutex;

static enum {   /* Reasons for waking up */
        TP_ACPI_WAKEUP_NONE = 0,        /* None or unknown */
        TP_ACPI_WAKEUP_BAYEJ,           /* Bay ejection request */
        TP_ACPI_WAKEUP_UNDOCK,          /* Undock request */
} hotkey_wakeup_reason;

static int hotkey_autosleep_ack;

static u32 hotkey_orig_mask;            /* events the BIOS had enabled */
static u32 hotkey_all_mask;             /* all events supported in fw */
static u32 hotkey_adaptive_all_mask;    /* all adaptive events supported in fw */
static u32 hotkey_reserved_mask;        /* events better left disabled */
static u32 hotkey_driver_mask;          /* events needed by the driver */
static u32 hotkey_user_mask;            /* events visible to userspace */
static u32 hotkey_acpi_mask;            /* events enabled in firmware */

static u16 *hotkey_keycode_map;

static struct attribute_set *hotkey_dev_attributes;

static void tpacpi_driver_event(const unsigned int hkey_event);
static void hotkey_driver_event(const unsigned int scancode);
static void hotkey_poll_setup(const bool may_warn);

/* HKEY.MHKG() return bits */
#define TP_HOTKEY_TABLET_MASK (1 << 3)
enum {
        TP_ACPI_MULTI_MODE_INVALID      = 0,
        TP_ACPI_MULTI_MODE_UNKNOWN      = 1 << 0,
        TP_ACPI_MULTI_MODE_LAPTOP       = 1 << 1,
        TP_ACPI_MULTI_MODE_TABLET       = 1 << 2,
        TP_ACPI_MULTI_MODE_FLAT         = 1 << 3,
        TP_ACPI_MULTI_MODE_STAND        = 1 << 4,
        TP_ACPI_MULTI_MODE_TENT         = 1 << 5,
        TP_ACPI_MULTI_MODE_STAND_TENT   = 1 << 6,
};

enum {
        /* The following modes are considered tablet mode for the purpose of
         * reporting the status to userspace. i.e. in all these modes it makes
         * sense to disable the laptop input devices such as touchpad and
         * keyboard.
         */
        TP_ACPI_MULTI_MODE_TABLET_LIKE  = TP_ACPI_MULTI_MODE_TABLET |
                                          TP_ACPI_MULTI_MODE_STAND |
                                          TP_ACPI_MULTI_MODE_TENT |
                                          TP_ACPI_MULTI_MODE_STAND_TENT,
};

static int hotkey_get_wlsw(void)
{
        int status;

        if (!tp_features.hotkey_wlsw)
                return -ENODEV;

#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
        if (dbg_wlswemul)
                return (tpacpi_wlsw_emulstate) ?
                                TPACPI_RFK_RADIO_ON : TPACPI_RFK_RADIO_OFF;
#endif

        if (!acpi_evalf(hkey_handle, &status, "WLSW", "d"))
                return -EIO;

        return (status) ? TPACPI_RFK_RADIO_ON : TPACPI_RFK_RADIO_OFF;
}

static int hotkey_gmms_get_tablet_mode(int s, int *has_tablet_mode)
{
        int type = (s >> 16) & 0xffff;
        int value = s & 0xffff;
        int mode = TP_ACPI_MULTI_MODE_INVALID;
        int valid_modes = 0;

        if (has_tablet_mode)
                *has_tablet_mode = 0;

        switch (type) {
        case 1:
                valid_modes = TP_ACPI_MULTI_MODE_LAPTOP |
                              TP_ACPI_MULTI_MODE_TABLET |
                              TP_ACPI_MULTI_MODE_STAND_TENT;
                break;
        case 2:
                valid_modes = TP_ACPI_MULTI_MODE_LAPTOP |
                              TP_ACPI_MULTI_MODE_FLAT |
                              TP_ACPI_MULTI_MODE_TABLET |
                              TP_ACPI_MULTI_MODE_STAND |
                              TP_ACPI_MULTI_MODE_TENT;
                break;
        case 3:
                valid_modes = TP_ACPI_MULTI_MODE_LAPTOP |
                              TP_ACPI_MULTI_MODE_FLAT;
                break;
        case 4:
        case 5:
                /* In mode 4, FLAT is not specified as a valid mode. However,
                 * it can be seen at least on the X1 Yoga 2nd Generation.
                 */
                valid_modes = TP_ACPI_MULTI_MODE_LAPTOP |
                              TP_ACPI_MULTI_MODE_FLAT |
                              TP_ACPI_MULTI_MODE_TABLET |
                              TP_ACPI_MULTI_MODE_STAND |
                              TP_ACPI_MULTI_MODE_TENT;
                break;
        default:
                pr_err("Unknown multi mode status type %d with value 0x%04X, please report this to %s\n",
                       type, value, TPACPI_MAIL);
                return 0;
        }

        if (has_tablet_mode && (valid_modes & TP_ACPI_MULTI_MODE_TABLET_LIKE))
                *has_tablet_mode = 1;

        switch (value) {
        case 1:
                mode = TP_ACPI_MULTI_MODE_LAPTOP;
                break;
        case 2:
                mode = TP_ACPI_MULTI_MODE_FLAT;
                break;
        case 3:
                mode = TP_ACPI_MULTI_MODE_TABLET;
                break;
        case 4:
                if (type == 1)
                        mode = TP_ACPI_MULTI_MODE_STAND_TENT;
                else
                        mode = TP_ACPI_MULTI_MODE_STAND;
                break;
        case 5:
                mode = TP_ACPI_MULTI_MODE_TENT;
                break;
        default:
                if (type == 5 && value == 0xffff) {
                        pr_warn("Multi mode status is undetected, assuming laptop\n");
                        return 0;
                }
        }

        if (!(mode & valid_modes)) {
                pr_err("Unknown/reserved multi mode value 0x%04X for type %d, please report this to %s\n",
                       value, type, TPACPI_MAIL);
                return 0;
        }

        return !!(mode & TP_ACPI_MULTI_MODE_TABLET_LIKE);
}

static int hotkey_get_tablet_mode(int *status)
{
        int s;

        switch (tp_features.hotkey_tablet) {
        case TP_HOTKEY_TABLET_USES_MHKG:
                if (!acpi_evalf(hkey_handle, &s, "MHKG", "d"))
                        return -EIO;

                *status = ((s & TP_HOTKEY_TABLET_MASK) != 0);
                break;
        case TP_HOTKEY_TABLET_USES_GMMS:
                if (!acpi_evalf(hkey_handle, &s, "GMMS", "dd", 0))
                        return -EIO;

                *status = hotkey_gmms_get_tablet_mode(s, NULL);
                break;
        default:
                break;
        }

        return 0;
}

/*
 * Reads current event mask from firmware, and updates
 * hotkey_acpi_mask accordingly.  Also resets any bits
 * from hotkey_user_mask that are unavailable to be
 * delivered (shadow requirement of the userspace ABI).
 *
 * Call with hotkey_mutex held
 */
static int hotkey_mask_get(void)
{
        if (tp_features.hotkey_mask) {
                u32 m = 0;

                if (!acpi_evalf(hkey_handle, &m, "DHKN", "d"))
                        return -EIO;

                hotkey_acpi_mask = m;
        } else {
                /* no mask support doesn't mean no event support... */
                hotkey_acpi_mask = hotkey_all_mask;
        }

        /* sync userspace-visible mask */
        hotkey_user_mask &= (hotkey_acpi_mask | hotkey_source_mask);

        return 0;
}

static void hotkey_mask_warn_incomplete_mask(void)
{
        /* log only what the user can fix... */
        const u32 wantedmask = hotkey_driver_mask &
                ~(hotkey_acpi_mask | hotkey_source_mask) &
                (hotkey_all_mask | TPACPI_HKEY_NVRAM_KNOWN_MASK);

        if (wantedmask)
                pr_notice("required events 0x%08x not enabled!\n", wantedmask);
}

/*
 * Set the firmware mask when supported
 *
 * Also calls hotkey_mask_get to update hotkey_acpi_mask.
 *
 * NOTE: does not set bits in hotkey_user_mask, but may reset them.
 *
 * Call with hotkey_mutex held
 */
static int hotkey_mask_set(u32 mask)
{
        int i;
        int rc = 0;

        const u32 fwmask = mask & ~hotkey_source_mask;

        if (tp_features.hotkey_mask) {
                for (i = 0; i < 32; i++) {
                        if (!acpi_evalf(hkey_handle,
                                        NULL, "MHKM", "vdd", i + 1,
                                        !!(mask & (1 << i)))) {
                                rc = -EIO;
                                break;
                        }
                }
        }

        /*
         * We *must* make an inconditional call to hotkey_mask_get to
         * refresh hotkey_acpi_mask and update hotkey_user_mask
         *
         * Take the opportunity to also log when we cannot _enable_
         * a given event.
         */
        if (!hotkey_mask_get() && !rc && (fwmask & ~hotkey_acpi_mask)) {
                pr_notice("asked for hotkey mask 0x%08x, but firmware forced it to 0x%08x\n",
                          fwmask, hotkey_acpi_mask);
        }

        if (tpacpi_lifecycle != TPACPI_LIFE_EXITING)
                hotkey_mask_warn_incomplete_mask();

        return rc;
}

/*
 * Sets hotkey_user_mask and tries to set the firmware mask
 *
 * Call with hotkey_mutex held
 */
static int hotkey_user_mask_set(const u32 mask)
{
        int rc;

        /* Give people a chance to notice they are doing something that
         * is bound to go boom on their users sooner or later */
        if (!tp_warned.hotkey_mask_ff &&
            (mask == 0xffff || mask == 0xffffff ||
             mask == 0xffffffff)) {
                tp_warned.hotkey_mask_ff = 1;
                pr_notice("setting the hotkey mask to 0x%08x is likely not the best way to go about it\n",
                          mask);
                pr_notice("please consider using the driver defaults, and refer to up-to-date thinkpad-acpi documentation\n");
        }

        /* Try to enable what the user asked for, plus whatever we need.
         * this syncs everything but won't enable bits in hotkey_user_mask */
        rc = hotkey_mask_set((mask | hotkey_driver_mask) & ~hotkey_source_mask);

        /* Enable the available bits in hotkey_user_mask */
        hotkey_user_mask = mask & (hotkey_acpi_mask | hotkey_source_mask);

        return rc;
}

/*
 * Sets the driver hotkey mask.
 *
 * Can be called even if the hotkey subdriver is inactive
 */
static int tpacpi_hotkey_driver_mask_set(const u32 mask)
{
        int rc;

        /* Do the right thing if hotkey_init has not been called yet */
        if (!tp_features.hotkey) {
                hotkey_driver_mask = mask;
                return 0;
        }

        mutex_lock(&hotkey_mutex);

        HOTKEY_CONFIG_CRITICAL_START
        hotkey_driver_mask = mask;
#ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
        hotkey_source_mask |= (mask & ~hotkey_all_mask);
#endif
        HOTKEY_CONFIG_CRITICAL_END

        rc = hotkey_mask_set((hotkey_acpi_mask | hotkey_driver_mask) &
                                                        ~hotkey_source_mask);
        hotkey_poll_setup(true);

        mutex_unlock(&hotkey_mutex);

        return rc;
}

static int hotkey_status_get(int *status)
{
        if (!acpi_evalf(hkey_handle, status, "DHKC", "d"))
                return -EIO;

        return 0;
}

static int hotkey_status_set(bool enable)
{
        if (!acpi_evalf(hkey_handle, NULL, "MHKC", "vd", enable ? 1 : 0))
                return -EIO;

        return 0;
}

static void tpacpi_input_send_tabletsw(void)
{
        int state;

        if (tp_features.hotkey_tablet &&
            !hotkey_get_tablet_mode(&state)) {
                mutex_lock(&tpacpi_inputdev_send_mutex);

                input_report_switch(tpacpi_inputdev,
                                    SW_TABLET_MODE, !!state);
                input_sync(tpacpi_inputdev);

                mutex_unlock(&tpacpi_inputdev_send_mutex);
        }
}

/* Do NOT call without validating scancode first */
static void tpacpi_input_send_key(const unsigned int scancode)
{
        const unsigned int keycode = hotkey_keycode_map[scancode];

        if (keycode != KEY_RESERVED) {
                mutex_lock(&tpacpi_inputdev_send_mutex);

                input_event(tpacpi_inputdev, EV_MSC, MSC_SCAN, scancode);
                input_report_key(tpacpi_inputdev, keycode, 1);
                input_sync(tpacpi_inputdev);

                input_event(tpacpi_inputdev, EV_MSC, MSC_SCAN, scancode);
                input_report_key(tpacpi_inputdev, keycode, 0);
                input_sync(tpacpi_inputdev);

                mutex_unlock(&tpacpi_inputdev_send_mutex);
        }
}

/* Do NOT call without validating scancode first */
static void tpacpi_input_send_key_masked(const unsigned int scancode)
{
        hotkey_driver_event(scancode);
        if (hotkey_user_mask & (1 << scancode))
                tpacpi_input_send_key(scancode);
}

#ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
static struct tp_acpi_drv_struct ibm_hotkey_acpidriver;

/* Do NOT call without validating scancode first */
static void tpacpi_hotkey_send_key(unsigned int scancode)
{
        tpacpi_input_send_key_masked(scancode);
}

static void hotkey_read_nvram(struct tp_nvram_state *n, const u32 m)
{
        u8 d;

        if (m & TP_NVRAM_HKEY_GROUP_HK2) {
                d = nvram_read_byte(TP_NVRAM_ADDR_HK2);
                n->thinkpad_toggle = !!(d & TP_NVRAM_MASK_HKT_THINKPAD);
                n->zoom_toggle = !!(d & TP_NVRAM_MASK_HKT_ZOOM);
                n->display_toggle = !!(d & TP_NVRAM_MASK_HKT_DISPLAY);
                n->hibernate_toggle = !!(d & TP_NVRAM_MASK_HKT_HIBERNATE);
        }
        if (m & TP_ACPI_HKEY_KBD_LIGHT_MASK) {
                d = nvram_read_byte(TP_NVRAM_ADDR_THINKLIGHT);
                n->thinklight_toggle = !!(d & TP_NVRAM_MASK_THINKLIGHT);
        }
        if (m & TP_ACPI_HKEY_DISPXPAND_MASK) {
                d = nvram_read_byte(TP_NVRAM_ADDR_VIDEO);
                n->displayexp_toggle =
                                !!(d & TP_NVRAM_MASK_HKT_DISPEXPND);
        }
        if (m & TP_NVRAM_HKEY_GROUP_BRIGHTNESS) {
                d = nvram_read_byte(TP_NVRAM_ADDR_BRIGHTNESS);
                n->brightness_level = (d & TP_NVRAM_MASK_LEVEL_BRIGHTNESS)
                                >> TP_NVRAM_POS_LEVEL_BRIGHTNESS;
                n->brightness_toggle =
                                !!(d & TP_NVRAM_MASK_HKT_BRIGHTNESS);
        }
        if (m & TP_NVRAM_HKEY_GROUP_VOLUME) {
                d = nvram_read_byte(TP_NVRAM_ADDR_MIXER);
                n->volume_level = (d & TP_NVRAM_MASK_LEVEL_VOLUME)
                                >> TP_NVRAM_POS_LEVEL_VOLUME;
                n->mute = !!(d & TP_NVRAM_MASK_MUTE);
                n->volume_toggle = !!(d & TP_NVRAM_MASK_HKT_VOLUME);
        }
}

#define TPACPI_COMPARE_KEY(__scancode, __member) \
do { \
        if ((event_mask & (1 << __scancode)) && \
            oldn->__member != newn->__member) \
                tpacpi_hotkey_send_key(__scancode); \
} while (0)

#define TPACPI_MAY_SEND_KEY(__scancode) \
do { \
        if (event_mask & (1 << __scancode)) \
                tpacpi_hotkey_send_key(__scancode); \
} while (0)

static void issue_volchange(const unsigned int oldvol,
                            const unsigned int newvol,
                            const u32 event_mask)
{
        unsigned int i = oldvol;

        while (i > newvol) {
                TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_VOLUMEDOWN);
                i--;
        }
        while (i < newvol) {
                TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_VOLUMEUP);
                i++;
        }
}

static void issue_brightnesschange(const unsigned int oldbrt,
                                   const unsigned int newbrt,
                                   const u32 event_mask)
{
        unsigned int i = oldbrt;

        while (i > newbrt) {
                TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_FNEND);
                i--;
        }
        while (i < newbrt) {
                TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_FNHOME);
                i++;
        }
}

static void hotkey_compare_and_issue_event(struct tp_nvram_state *oldn,
                                           struct tp_nvram_state *newn,
                                           const u32 event_mask)
{

        TPACPI_COMPARE_KEY(TP_ACPI_HOTKEYSCAN_THINKPAD, thinkpad_toggle);
        TPACPI_COMPARE_KEY(TP_ACPI_HOTKEYSCAN_FNSPACE, zoom_toggle);
        TPACPI_COMPARE_KEY(TP_ACPI_HOTKEYSCAN_FNF7, display_toggle);
        TPACPI_COMPARE_KEY(TP_ACPI_HOTKEYSCAN_FNF12, hibernate_toggle);

        TPACPI_COMPARE_KEY(TP_ACPI_HOTKEYSCAN_FNPAGEUP, thinklight_toggle);

        TPACPI_COMPARE_KEY(TP_ACPI_HOTKEYSCAN_FNF8, displayexp_toggle);

        /*
         * Handle volume
         *
         * This code is supposed to duplicate the IBM firmware behaviour:
         * - Pressing MUTE issues mute hotkey message, even when already mute
         * - Pressing Volume up/down issues volume up/down hotkey messages,
         *   even when already at maximum or minimum volume
         * - The act of unmuting issues volume up/down notification,
         *   depending which key was used to unmute
         *
         * We are constrained to what the NVRAM can tell us, which is not much
         * and certainly not enough if more than one volume hotkey was pressed
         * since the last poll cycle.
         *
         * Just to make our life interesting, some newer Lenovo ThinkPads have
         * bugs in the BIOS and may fail to update volume_toggle properly.
         */
        if (newn->mute) {
                /* muted */
                if (!oldn->mute ||
                    oldn->volume_toggle != newn->volume_toggle ||
                    oldn->volume_level != newn->volume_level) {
                        /* recently muted, or repeated mute keypress, or
                         * multiple presses ending in mute */
                        issue_volchange(oldn->volume_level, newn->volume_level,
                                event_mask);
                        TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_MUTE);
                }
        } else {
                /* unmute */
                if (oldn->mute) {
                        /* recently unmuted, issue 'unmute' keypress */
                        TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_VOLUMEUP);
                }
                if (oldn->volume_level != newn->volume_level) {
                        issue_volchange(oldn->volume_level, newn->volume_level,
                                event_mask);
                } else if (oldn->volume_toggle != newn->volume_toggle) {
                        /* repeated vol up/down keypress at end of scale ? */
                        if (newn->volume_level == 0)
                                TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_VOLUMEDOWN);
                        else if (newn->volume_level >= TP_NVRAM_LEVEL_VOLUME_MAX)
                                TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_VOLUMEUP);
                }
        }

        /* handle brightness */
        if (oldn->brightness_level != newn->brightness_level) {
                issue_brightnesschange(oldn->brightness_level,
                                       newn->brightness_level, event_mask);
        } else if (oldn->brightness_toggle != newn->brightness_toggle) {
                /* repeated key presses that didn't change state */
                if (newn->brightness_level == 0)
                        TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_FNEND);
                else if (newn->brightness_level >= bright_maxlvl
                                && !tp_features.bright_unkfw)
                        TPACPI_MAY_SEND_KEY(TP_ACPI_HOTKEYSCAN_FNHOME);
        }

#undef TPACPI_COMPARE_KEY
#undef TPACPI_MAY_SEND_KEY
}

/*
 * Polling driver
 *
 * We track all events in hotkey_source_mask all the time, since
 * most of them are edge-based.  We only issue those requested by
 * hotkey_user_mask or hotkey_driver_mask, though.
 */
static int hotkey_kthread(void *data)
{
        struct tp_nvram_state s[2];
        u32 poll_mask, event_mask;
        unsigned int si, so;
        unsigned long t;
        unsigned int change_detector;
        unsigned int poll_freq;
        bool was_frozen;

        if (tpacpi_lifecycle == TPACPI_LIFE_EXITING)
                goto exit;

        set_freezable();

        so = 0;
        si = 1;
        t = 0;

        /* Initial state for compares */
        mutex_lock(&hotkey_thread_data_mutex);
        change_detector = hotkey_config_change;
        poll_mask = hotkey_source_mask;
        event_mask = hotkey_source_mask &
                        (hotkey_driver_mask | hotkey_user_mask);
        poll_freq = hotkey_poll_freq;
        mutex_unlock(&hotkey_thread_data_mutex);
        hotkey_read_nvram(&s[so], poll_mask);

        while (!kthread_should_stop()) {
                if (t == 0) {
                        if (likely(poll_freq))
                                t = 1000/poll_freq;
                        else
                                t = 100;        /* should never happen... */
                }
                t = msleep_interruptible(t);
                if (unlikely(kthread_freezable_should_stop(&was_frozen)))
                        break;

                if (t > 0 && !was_frozen)
                        continue;

                mutex_lock(&hotkey_thread_data_mutex);
                if (was_frozen || hotkey_config_change != change_detector) {
                        /* forget old state on thaw or config change */
                        si = so;
                        t = 0;
                        change_detector = hotkey_config_change;
                }
                poll_mask = hotkey_source_mask;
                event_mask = hotkey_source_mask &
                                (hotkey_driver_mask | hotkey_user_mask);
                poll_freq = hotkey_poll_freq;
                mutex_unlock(&hotkey_thread_data_mutex);

                if (likely(poll_mask)) {
                        hotkey_read_nvram(&s[si], poll_mask);
                        if (likely(si != so)) {
                                hotkey_compare_and_issue_event(&s[so], &s[si],
                                                                event_mask);
                        }
                }

                so = si;
                si ^= 1;
        }

exit:
        return 0;
}

/* call with hotkey_mutex held */
static void hotkey_poll_stop_sync(void)
{
        if (tpacpi_hotkey_task) {
                kthread_stop(tpacpi_hotkey_task);
                tpacpi_hotkey_task = NULL;
        }
}

/* call with hotkey_mutex held */
static void hotkey_poll_setup(const bool may_warn)
{
        const u32 poll_driver_mask = hotkey_driver_mask & hotkey_source_mask;
        const u32 poll_user_mask = hotkey_user_mask & hotkey_source_mask;

        if (hotkey_poll_freq > 0 &&
            (poll_driver_mask ||
             (poll_user_mask && tpacpi_inputdev->users > 0))) {
                if (!tpacpi_hotkey_task) {
                        tpacpi_hotkey_task = kthread_run(hotkey_kthread,
                                        NULL, TPACPI_NVRAM_KTHREAD_NAME);
                        if (IS_ERR(tpacpi_hotkey_task)) {
                                tpacpi_hotkey_task = NULL;
                                pr_err("could not create kernel thread for hotkey polling\n");
                        }
                }
        } else {
                hotkey_poll_stop_sync();
                if (may_warn && (poll_driver_mask || poll_user_mask) &&
                    hotkey_poll_freq == 0) {
                        pr_notice("hot keys 0x%08x and/or events 0x%08x require polling, which is currently disabled\n",
                                  poll_user_mask, poll_driver_mask);
                }
        }
}

static void hotkey_poll_setup_safe(const bool may_warn)
{
        mutex_lock(&hotkey_mutex);
        hotkey_poll_setup(may_warn);
        mutex_unlock(&hotkey_mutex);
}

/* call with hotkey_mutex held */
static void hotkey_poll_set_freq(unsigned int freq)
{
        if (!freq)
                hotkey_poll_stop_sync();

        hotkey_poll_freq = freq;
}

#else /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */

static void hotkey_poll_setup(const bool __unused)
{
}

static void hotkey_poll_setup_safe(const bool __unused)
{
}

#endif /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */

static int hotkey_inputdev_open(struct input_dev *dev)
{
        switch (tpacpi_lifecycle) {
        case TPACPI_LIFE_INIT:
        case TPACPI_LIFE_RUNNING:
                hotkey_poll_setup_safe(false);
                return 0;
        case TPACPI_LIFE_EXITING:
                return -EBUSY;
        }

        /* Should only happen if tpacpi_lifecycle is corrupt */
        BUG();
        return -EBUSY;
}

static void hotkey_inputdev_close(struct input_dev *dev)
{
        /* disable hotkey polling when possible */
        if (tpacpi_lifecycle != TPACPI_LIFE_EXITING &&
            !(hotkey_source_mask & hotkey_driver_mask))
                hotkey_poll_setup_safe(false);
}

/* sysfs hotkey enable ------------------------------------------------- */
static ssize_t hotkey_enable_show(struct device *dev,
                           struct device_attribute *attr,
                           char *buf)
{
        int res, status;

        printk_deprecated_attribute("hotkey_enable",
                        "Hotkey reporting is always enabled");

        res = hotkey_status_get(&status);
        if (res)
                return res;

        return snprintf(buf, PAGE_SIZE, "%d\n", status);
}

static ssize_t hotkey_enable_store(struct device *dev,
                            struct device_attribute *attr,
                            const char *buf, size_t count)
{
        unsigned long t;

        printk_deprecated_attribute("hotkey_enable",
                        "Hotkeys can be disabled through hotkey_mask");

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

        if (t == 0)
                return -EPERM;

        return count;
}

static DEVICE_ATTR_RW(hotkey_enable);

/* sysfs hotkey mask --------------------------------------------------- */
static ssize_t hotkey_mask_show(struct device *dev,
                           struct device_attribute *attr,
                           char *buf)
{
        return snprintf(buf, PAGE_SIZE, "0x%08x\n", hotkey_user_mask);
}

static ssize_t hotkey_mask_store(struct device *dev,
                            struct device_attribute *attr,
                            const char *buf, size_t count)
{
        unsigned long t;
        int res;

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

        if (mutex_lock_killable(&hotkey_mutex))
                return -ERESTARTSYS;

        res = hotkey_user_mask_set(t);

#ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
        hotkey_poll_setup(true);
#endif

        mutex_unlock(&hotkey_mutex);

        tpacpi_disclose_usertask("hotkey_mask", "set to 0x%08lx\n", t);

        return (res) ? res : count;
}

static DEVICE_ATTR_RW(hotkey_mask);

/* sysfs hotkey bios_enabled ------------------------------------------- */
static ssize_t hotkey_bios_enabled_show(struct device *dev,
                           struct device_attribute *attr,
                           char *buf)
{
        return sprintf(buf, "0\n");
}

static DEVICE_ATTR_RO(hotkey_bios_enabled);

/* sysfs hotkey bios_mask ---------------------------------------------- */
static ssize_t hotkey_bios_mask_show(struct device *dev,
                           struct device_attribute *attr,
                           char *buf)
{
        printk_deprecated_attribute("hotkey_bios_mask",
                        "This attribute is useless.");
        return snprintf(buf, PAGE_SIZE, "0x%08x\n", hotkey_orig_mask);
}

static DEVICE_ATTR_RO(hotkey_bios_mask);

/* sysfs hotkey all_mask ----------------------------------------------- */
static ssize_t hotkey_all_mask_show(struct device *dev,
                           struct device_attribute *attr,
                           char *buf)
{
        return snprintf(buf, PAGE_SIZE, "0x%08x\n",
                                hotkey_all_mask | hotkey_source_mask);
}

static DEVICE_ATTR_RO(hotkey_all_mask);

/* sysfs hotkey all_mask ----------------------------------------------- */
static ssize_t hotkey_adaptive_all_mask_show(struct device *dev,
                           struct device_attribute *attr,
                           char *buf)
{
        return snprintf(buf, PAGE_SIZE, "0x%08x\n",
                        hotkey_adaptive_all_mask | hotkey_source_mask);
}

static DEVICE_ATTR_RO(hotkey_adaptive_all_mask);

/* sysfs hotkey recommended_mask --------------------------------------- */
static ssize_t hotkey_recommended_mask_show(struct device *dev,
                                            struct device_attribute *attr,
                                            char *buf)
{
        return snprintf(buf, PAGE_SIZE, "0x%08x\n",
                        (hotkey_all_mask | hotkey_source_mask)
                        & ~hotkey_reserved_mask);
}

static DEVICE_ATTR_RO(hotkey_recommended_mask);

#ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL

/* sysfs hotkey hotkey_source_mask ------------------------------------- */
static ssize_t hotkey_source_mask_show(struct device *dev,
                           struct device_attribute *attr,
                           char *buf)
{
        return snprintf(buf, PAGE_SIZE, "0x%08x\n", hotkey_source_mask);
}

static ssize_t hotkey_source_mask_store(struct device *dev,
                            struct device_attribute *attr,
                            const char *buf, size_t count)
{
        unsigned long t;
        u32 r_ev;
        int rc;

        if (parse_strtoul(buf, 0xffffffffUL, &t) ||
                ((t & ~TPACPI_HKEY_NVRAM_KNOWN_MASK) != 0))
                return -EINVAL;

        if (mutex_lock_killable(&hotkey_mutex))
                return -ERESTARTSYS;

        HOTKEY_CONFIG_CRITICAL_START
        hotkey_source_mask = t;
        HOTKEY_CONFIG_CRITICAL_END

        rc = hotkey_mask_set((hotkey_user_mask | hotkey_driver_mask) &
                        ~hotkey_source_mask);
        hotkey_poll_setup(true);

        /* check if events needed by the driver got disabled */
        r_ev = hotkey_driver_mask & ~(hotkey_acpi_mask & hotkey_all_mask)
                & ~hotkey_source_mask & TPACPI_HKEY_NVRAM_KNOWN_MASK;

        mutex_unlock(&hotkey_mutex);

        if (rc < 0)
                pr_err("hotkey_source_mask: failed to update the firmware event mask!\n");

        if (r_ev)
                pr_notice("hotkey_source_mask: some important events were disabled: 0x%04x\n",
                          r_ev);

        tpacpi_disclose_usertask("hotkey_source_mask", "set to 0x%08lx\n", t);

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

static DEVICE_ATTR_RW(hotkey_source_mask);

/* sysfs hotkey hotkey_poll_freq --------------------------------------- */
static ssize_t hotkey_poll_freq_show(struct device *dev,
                           struct device_attribute *attr,
                           char *buf)
{
        return snprintf(buf, PAGE_SIZE, "%d\n", hotkey_poll_freq);
}

static ssize_t hotkey_poll_freq_store(struct device *dev,
                            struct device_attribute *attr,
                            const char *buf, size_t count)
{
        unsigned long t;

        if (parse_strtoul(buf, 25, &t))
                return -EINVAL;

        if (mutex_lock_killable(&hotkey_mutex))
                return -ERESTARTSYS;

        hotkey_poll_set_freq(t);
        hotkey_poll_setup(true);

        mutex_unlock(&hotkey_mutex);

        tpacpi_disclose_usertask("hotkey_poll_freq", "set to %lu\n", t);

        return count;
}

static DEVICE_ATTR_RW(hotkey_poll_freq);

#endif /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */

/* sysfs hotkey radio_sw (pollable) ------------------------------------ */
static ssize_t hotkey_radio_sw_show(struct device *dev,
                           struct device_attribute *attr,
                           char *buf)
{
        int res;
        res = hotkey_get_wlsw();
        if (res < 0)
                return res;

        /* Opportunistic update */
        tpacpi_rfk_update_hwblock_state((res == TPACPI_RFK_RADIO_OFF));

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

static DEVICE_ATTR_RO(hotkey_radio_sw);

static void hotkey_radio_sw_notify_change(void)
{
        if (tp_features.hotkey_wlsw)
                sysfs_notify(&tpacpi_pdev->dev.kobj, NULL,
                             "hotkey_radio_sw");
}

/* sysfs hotkey tablet mode (pollable) --------------------------------- */
static ssize_t hotkey_tablet_mode_show(struct device *dev,
                           struct device_attribute *attr,
                           char *buf)
{
        int res, s;
        res = hotkey_get_tablet_mode(&s);
        if (res < 0)
                return res;

        return snprintf(buf, PAGE_SIZE, "%d\n", !!s);
}

static DEVICE_ATTR_RO(hotkey_tablet_mode);

static void hotkey_tablet_mode_notify_change(void)
{
        if (tp_features.hotkey_tablet)
                sysfs_notify(&tpacpi_pdev->dev.kobj, NULL,
                             "hotkey_tablet_mode");
}

/* sysfs wakeup reason (pollable) -------------------------------------- */
static ssize_t hotkey_wakeup_reason_show(struct device *dev,
                           struct device_attribute *attr,
                           char *buf)
{
        return snprintf(buf, PAGE_SIZE, "%d\n", hotkey_wakeup_reason);
}

static DEVICE_ATTR(wakeup_reason, S_IRUGO, hotkey_wakeup_reason_show, NULL);

static void hotkey_wakeup_reason_notify_change(void)
{
        sysfs_notify(&tpacpi_pdev->dev.kobj, NULL,
                     "wakeup_reason");
}

/* sysfs wakeup hotunplug_complete (pollable) -------------------------- */
static ssize_t hotkey_wakeup_hotunplug_complete_show(struct device *dev,
                           struct device_attribute *attr,
                           char *buf)
{
        return snprintf(buf, PAGE_SIZE, "%d\n", hotkey_autosleep_ack);
}

static DEVICE_ATTR(wakeup_hotunplug_complete, S_IRUGO,
                   hotkey_wakeup_hotunplug_complete_show, NULL);

static void hotkey_wakeup_hotunplug_complete_notify_change(void)
{
        sysfs_notify(&tpacpi_pdev->dev.kobj, NULL,
                     "wakeup_hotunplug_complete");
}

/* sysfs adaptive kbd mode --------------------------------------------- */

static int adaptive_keyboard_get_mode(void);
static int adaptive_keyboard_set_mode(int new_mode);

enum ADAPTIVE_KEY_MODE {
        HOME_MODE,
        WEB_BROWSER_MODE,
        WEB_CONFERENCE_MODE,
        FUNCTION_MODE,
        LAYFLAT_MODE
};

static ssize_t adaptive_kbd_mode_show(struct device *dev,
                           struct device_attribute *attr,
                           char *buf)
{
        int current_mode;

        current_mode = adaptive_keyboard_get_mode();
        if (current_mode < 0)
                return current_mode;

        return snprintf(buf, PAGE_SIZE, "%d\n", current_mode);
}

static ssize_t adaptive_kbd_mode_store(struct device *dev,
                            struct device_attribute *attr,
                            const char *buf, size_t count)
{
        unsigned long t;
        int res;

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

        res = adaptive_keyboard_set_mode(t);
        return (res < 0) ? res : count;
}

static DEVICE_ATTR_RW(adaptive_kbd_mode);

static struct attribute *adaptive_kbd_attributes[] = {
        &dev_attr_adaptive_kbd_mode.attr,
        NULL
};

static const struct attribute_group adaptive_kbd_attr_group = {
        .attrs = adaptive_kbd_attributes,
};

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

static struct attribute *hotkey_attributes[] __initdata = {
        &dev_attr_hotkey_enable.attr,
        &dev_attr_hotkey_bios_enabled.attr,
        &dev_attr_hotkey_bios_mask.attr,
        &dev_attr_wakeup_reason.attr,
        &dev_attr_wakeup_hotunplug_complete.attr,
        &dev_attr_hotkey_mask.attr,
        &dev_attr_hotkey_all_mask.attr,
        &dev_attr_hotkey_adaptive_all_mask.attr,
        &dev_attr_hotkey_recommended_mask.attr,
#ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
        &dev_attr_hotkey_source_mask.attr,
        &dev_attr_hotkey_poll_freq.attr,
#endif
};

/*
 * Sync both the hw and sw blocking state of all switches
 */
static void tpacpi_send_radiosw_update(void)
{
        int wlsw;

        /*
         * We must sync all rfkill controllers *before* issuing any
         * rfkill input events, or we will race the rfkill core input
         * handler.
         *
         * tpacpi_inputdev_send_mutex works as a synchronization point
         * for the above.
         *
         * We optimize to avoid numerous calls to hotkey_get_wlsw.
         */

        wlsw = hotkey_get_wlsw();

        /* Sync hw blocking state first if it is hw-blocked */
        if (wlsw == TPACPI_RFK_RADIO_OFF)
                tpacpi_rfk_update_hwblock_state(true);

        /* Sync sw blocking state */
        tpacpi_rfk_update_swstate_all();

        /* Sync hw blocking state last if it is hw-unblocked */
        if (wlsw == TPACPI_RFK_RADIO_ON)
                tpacpi_rfk_update_hwblock_state(false);

        /* Issue rfkill input event for WLSW switch */
        if (!(wlsw < 0)) {
                mutex_lock(&tpacpi_inputdev_send_mutex);

                input_report_switch(tpacpi_inputdev,
                                    SW_RFKILL_ALL, (wlsw > 0));
                input_sync(tpacpi_inputdev);

                mutex_unlock(&tpacpi_inputdev_send_mutex);
        }

        /*
         * this can be unconditional, as we will poll state again
         * if userspace uses the notify to read data
         */
        hotkey_radio_sw_notify_change();
}

static void hotkey_exit(void)
{
#ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
        mutex_lock(&hotkey_mutex);
        hotkey_poll_stop_sync();
        mutex_unlock(&hotkey_mutex);
#endif

        if (hotkey_dev_attributes)
                delete_attr_set(hotkey_dev_attributes, &tpacpi_pdev->dev.kobj);

        dbg_printk(TPACPI_DBG_EXIT | TPACPI_DBG_HKEY,
                   "restoring original HKEY status and mask\n");
        /* yes, there is a bitwise or below, we want the
         * functions to be called even if one of them fail */
        if (((tp_features.hotkey_mask &&
              hotkey_mask_set(hotkey_orig_mask)) |
             hotkey_status_set(false)) != 0)
                pr_err("failed to restore hot key mask to BIOS defaults\n");
}

static void __init hotkey_unmap(const unsigned int scancode)
{
        if (hotkey_keycode_map[scancode] != KEY_RESERVED) {
                clear_bit(hotkey_keycode_map[scancode],
                          tpacpi_inputdev->keybit);
                hotkey_keycode_map[scancode] = KEY_RESERVED;
        }
}

/*
 * HKEY quirks:
 *   TPACPI_HK_Q_INIMASK:       Supports FN+F3,FN+F4,FN+F12
 */

#define TPACPI_HK_Q_INIMASK     0x0001

static const struct tpacpi_quirk tpacpi_hotkey_qtable[] __initconst = {
        TPACPI_Q_IBM('I', 'H', TPACPI_HK_Q_INIMASK), /* 600E */
        TPACPI_Q_IBM('I', 'N', TPACPI_HK_Q_INIMASK), /* 600E */
        TPACPI_Q_IBM('I', 'D', TPACPI_HK_Q_INIMASK), /* 770, 770E, 770ED */
        TPACPI_Q_IBM('I', 'W', TPACPI_HK_Q_INIMASK), /* A20m */
        TPACPI_Q_IBM('I', 'V', TPACPI_HK_Q_INIMASK), /* A20p */
        TPACPI_Q_IBM('1', '0', TPACPI_HK_Q_INIMASK), /* A21e, A22e */
        TPACPI_Q_IBM('K', 'U', TPACPI_HK_Q_INIMASK), /* A21e */
        TPACPI_Q_IBM('K', 'X', TPACPI_HK_Q_INIMASK), /* A21m, A22m */
        TPACPI_Q_IBM('K', 'Y', TPACPI_HK_Q_INIMASK), /* A21p, A22p */
        TPACPI_Q_IBM('1', 'B', TPACPI_HK_Q_INIMASK), /* A22e */
        TPACPI_Q_IBM('1', '3', TPACPI_HK_Q_INIMASK), /* A22m */
        TPACPI_Q_IBM('1', 'E', TPACPI_HK_Q_INIMASK), /* A30/p (0) */
        TPACPI_Q_IBM('1', 'C', TPACPI_HK_Q_INIMASK), /* R30 */
        TPACPI_Q_IBM('1', 'F', TPACPI_HK_Q_INIMASK), /* R31 */
        TPACPI_Q_IBM('I', 'Y', TPACPI_HK_Q_INIMASK), /* T20 */
        TPACPI_Q_IBM('K', 'Z', TPACPI_HK_Q_INIMASK), /* T21 */
        TPACPI_Q_IBM('1', '6', TPACPI_HK_Q_INIMASK), /* T22 */
        TPACPI_Q_IBM('I', 'Z', TPACPI_HK_Q_INIMASK), /* X20, X21 */
        TPACPI_Q_IBM('1', 'D', TPACPI_HK_Q_INIMASK), /* X22, X23, X24 */
};

typedef u16 tpacpi_keymap_entry_t;
typedef tpacpi_keymap_entry_t tpacpi_keymap_t[TPACPI_HOTKEY_MAP_LEN];

static int hotkey_init_tablet_mode(void)
{
        int in_tablet_mode = 0, res;
        char *type = NULL;

        if (acpi_evalf(hkey_handle, &res, "GMMS", "qdd", 0)) {
                int has_tablet_mode;

                in_tablet_mode = hotkey_gmms_get_tablet_mode(res,
                                                             &has_tablet_mode);
                if (has_tablet_mode)
                        tp_features.hotkey_tablet = TP_HOTKEY_TABLET_USES_GMMS;
                type = "GMMS";
        } else if (acpi_evalf(hkey_handle, &res, "MHKG", "qd")) {
                /* For X41t, X60t, X61t Tablets... */
                tp_features.hotkey_tablet = TP_HOTKEY_TABLET_USES_MHKG;
                in_tablet_mode = !!(res & TP_HOTKEY_TABLET_MASK);
                type = "MHKG";
        }

        if (!tp_features.hotkey_tablet)
                return 0;

        pr_info("Tablet mode switch found (type: %s), currently in %s mode\n",
                type, in_tablet_mode ? "tablet" : "laptop");

        res = add_to_attr_set(hotkey_dev_attributes,
                              &dev_attr_hotkey_tablet_mode.attr);
        if (res)
                return -1;

        return in_tablet_mode;
}

static int __init hotkey_init(struct ibm_init_struct *iibm)
{
        /* Requirements for changing the default keymaps:
         *
         * 1. Many of the keys are mapped to KEY_RESERVED for very
         *    good reasons.  Do not change them unless you have deep
         *    knowledge on the IBM and Lenovo ThinkPad firmware for
         *    the various ThinkPad models.  The driver behaves
         *    differently for KEY_RESERVED: such keys have their
         *    hot key mask *unset* in mask_recommended, and also
         *    in the initial hot key mask programmed into the
         *    firmware at driver load time, which means the firm-
         *    ware may react very differently if you change them to
         *    something else;
         *
         * 2. You must be subscribed to the linux-thinkpad and
         *    ibm-acpi-devel mailing lists, and you should read the
         *    list archives since 2007 if you want to change the
         *    keymaps.  This requirement exists so that you will
         *    know the past history of problems with the thinkpad-
         *    acpi driver keymaps, and also that you will be
         *    listening to any bug reports;
         *
         * 3. Do not send thinkpad-acpi specific patches directly to
         *    for merging, *ever*.  Send them to the linux-acpi
         *    mailinglist for comments.  Merging is to be done only
         *    through acpi-test and the ACPI maintainer.
         *
         * If the above is too much to ask, don't change the keymap.
         * Ask the thinkpad-acpi maintainer to do it, instead.
         */

        enum keymap_index {
                TPACPI_KEYMAP_IBM_GENERIC = 0,
                TPACPI_KEYMAP_LENOVO_GENERIC,
        };

        static const tpacpi_keymap_t tpacpi_keymaps[] __initconst = {
        /* Generic keymap for IBM ThinkPads */
        [TPACPI_KEYMAP_IBM_GENERIC] = {
                /* Scan Codes 0x00 to 0x0B: ACPI HKEY FN+F1..F12 */
                KEY_FN_F1,      KEY_BATTERY,    KEY_COFFEE,     KEY_SLEEP,
                KEY_WLAN,       KEY_FN_F6, KEY_SWITCHVIDEOMODE, KEY_FN_F8,
                KEY_FN_F9,      KEY_FN_F10,     KEY_FN_F11,     KEY_SUSPEND,

                /* Scan codes 0x0C to 0x1F: Other ACPI HKEY hot keys */
                KEY_UNKNOWN,    /* 0x0C: FN+BACKSPACE */
                KEY_UNKNOWN,    /* 0x0D: FN+INSERT */
                KEY_UNKNOWN,    /* 0x0E: FN+DELETE */

                /* brightness: firmware always reacts to them */
                KEY_RESERVED,   /* 0x0F: FN+HOME (brightness up) */
                KEY_RESERVED,   /* 0x10: FN+END (brightness down) */

                /* Thinklight: firmware always react to it */
                KEY_RESERVED,   /* 0x11: FN+PGUP (thinklight toggle) */

                KEY_UNKNOWN,    /* 0x12: FN+PGDOWN */
                KEY_ZOOM,       /* 0x13: FN+SPACE (zoom) */

                /* Volume: firmware always react to it and reprograms
                 * the built-in *extra* mixer.  Never map it to control
                 * another mixer by default. */
                KEY_RESERVED,   /* 0x14: VOLUME UP */
                KEY_RESERVED,   /* 0x15: VOLUME DOWN */
                KEY_RESERVED,   /* 0x16: MUTE */

                KEY_VENDOR,     /* 0x17: Thinkpad/AccessIBM/Lenovo */

                /* (assignments unknown, please report if found) */
                KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
                KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,

                /* No assignments, only used for Adaptive keyboards. */
                KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
                KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
                KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
                KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
                KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,

                /* No assignment, used for newer Lenovo models */
                KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
                KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
                KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
                KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
                KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
                KEY_UNKNOWN, KEY_UNKNOWN

                },

        /* Generic keymap for Lenovo ThinkPads */
        [TPACPI_KEYMAP_LENOVO_GENERIC] = {
                /* Scan Codes 0x00 to 0x0B: ACPI HKEY FN+F1..F12 */
                KEY_FN_F1,      KEY_COFFEE,     KEY_BATTERY,    KEY_SLEEP,
                KEY_WLAN,       KEY_CAMERA, KEY_SWITCHVIDEOMODE, KEY_FN_F8,
                KEY_FN_F9,      KEY_FN_F10,     KEY_FN_F11,     KEY_SUSPEND,

                /* Scan codes 0x0C to 0x1F: Other ACPI HKEY hot keys */
                KEY_UNKNOWN,    /* 0x0C: FN+BACKSPACE */
                KEY_UNKNOWN,    /* 0x0D: FN+INSERT */
                KEY_UNKNOWN,    /* 0x0E: FN+DELETE */

                /* These should be enabled --only-- when ACPI video
                 * is disabled (i.e. in "vendor" mode), and are handled
                 * in a special way by the init code */
                KEY_BRIGHTNESSUP,       /* 0x0F: FN+HOME (brightness up) */
                KEY_BRIGHTNESSDOWN,     /* 0x10: FN+END (brightness down) */

                KEY_RESERVED,   /* 0x11: FN+PGUP (thinklight toggle) */

                KEY_UNKNOWN,    /* 0x12: FN+PGDOWN */
                KEY_ZOOM,       /* 0x13: FN+SPACE (zoom) */

                /* Volume: z60/z61, T60 (BIOS version?): firmware always
                 * react to it and reprograms the built-in *extra* mixer.
                 * Never map it to control another mixer by default.
                 *
                 * T60?, T61, R60?, R61: firmware and EC tries to send
                 * these over the regular keyboard, so these are no-ops,
                 * but there are still weird bugs re. MUTE, so do not
                 * change unless you get test reports from all Lenovo
                 * models.  May cause the BIOS to interfere with the
                 * HDA mixer.
                 */
                KEY_RESERVED,   /* 0x14: VOLUME UP */
                KEY_RESERVED,   /* 0x15: VOLUME DOWN */
                KEY_RESERVED,   /* 0x16: MUTE */

                KEY_VENDOR,     /* 0x17: Thinkpad/AccessIBM/Lenovo */

                /* (assignments unknown, please report if found) */
                KEY_UNKNOWN, KEY_UNKNOWN,

                /*
                 * The mic mute button only sends 0x1a.  It does not
                 * automatically mute the mic or change the mute light.
                 */
                KEY_MICMUTE,    /* 0x1a: Mic mute (since ?400 or so) */

                /* (assignments unknown, please report if found) */
                KEY_UNKNOWN,

                /* Extra keys in use since the X240 / T440 / T540 */
                KEY_CONFIG, KEY_SEARCH, KEY_SCALE, KEY_FILE,

                /*
                 * These are the adaptive keyboard keycodes for Carbon X1 2014.
                 * The first item in this list is the Mute button which is
                 * emitted with 0x103 through
                 * adaptive_keyboard_hotkey_notify_hotkey() when the sound
                 * symbol is held.
                 * We'll need to offset those by 0x20.
                 */
                KEY_RESERVED,        /* Mute held, 0x103 */
                KEY_BRIGHTNESS_MIN,  /* Backlight off */
                KEY_RESERVED,        /* Clipping tool */
                KEY_RESERVED,        /* Cloud */
                KEY_RESERVED,
                KEY_VOICECOMMAND,    /* Voice */
                KEY_RESERVED,
                KEY_RESERVED,        /* Gestures */
                KEY_RESERVED,
                KEY_RESERVED,
                KEY_RESERVED,
                KEY_CONFIG,          /* Settings */
                KEY_RESERVED,        /* New tab */
                KEY_REFRESH,         /* Reload */
                KEY_BACK,            /* Back */
                KEY_RESERVED,        /* Microphone down */
                KEY_RESERVED,        /* Microphone up */
                KEY_RESERVED,        /* Microphone cancellation */
                KEY_RESERVED,        /* Camera mode */
                KEY_RESERVED,        /* Rotate display, 0x116 */

                /*
                 * These are found in 2017 models (e.g. T470s, X270).
                 * The lowest known value is 0x311, which according to
                 * the manual should launch a user defined favorite
                 * application.
                 *
                 * The offset for these is TP_ACPI_HOTKEYSCAN_EXTENDED_START,
                 * corresponding to 0x34.
                 */

                /* (assignments unknown, please report if found) */
                KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
                KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
                KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
                KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
                KEY_UNKNOWN,

                KEY_BOOKMARKS,       /* Favorite app, 0x311 */
                KEY_RESERVED,        /* Clipping tool */
                KEY_CALC,            /* Calculator (above numpad, P52) */
                KEY_BLUETOOTH,       /* Bluetooth */
                KEY_KEYBOARD         /* Keyboard, 0x315 */
                },
        };

        static const struct tpacpi_quirk tpacpi_keymap_qtable[] __initconst = {
                /* Generic maps (fallback) */
                {
                  .vendor = PCI_VENDOR_ID_IBM,
                  .bios = TPACPI_MATCH_ANY, .ec = TPACPI_MATCH_ANY,
                  .quirks = TPACPI_KEYMAP_IBM_GENERIC,
                },
                {
                  .vendor = PCI_VENDOR_ID_LENOVO,
                  .bios = TPACPI_MATCH_ANY, .ec = TPACPI_MATCH_ANY,
                  .quirks = TPACPI_KEYMAP_LENOVO_GENERIC,
                },
        };

#define TPACPI_HOTKEY_MAP_SIZE          sizeof(tpacpi_keymap_t)
#define TPACPI_HOTKEY_MAP_TYPESIZE      sizeof(tpacpi_keymap_entry_t)

        int res, i;
        int status;
        int hkeyv;
        bool radiosw_state  = false;
        bool tabletsw_state = false;

        unsigned long quirks;
        unsigned long keymap_id;

        vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
                        "initializing hotkey subdriver\n");

        BUG_ON(!tpacpi_inputdev);
        BUG_ON(tpacpi_inputdev->open != NULL ||
               tpacpi_inputdev->close != NULL);

        TPACPI_ACPIHANDLE_INIT(hkey);
        mutex_init(&hotkey_mutex);

#ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
        mutex_init(&hotkey_thread_data_mutex);
#endif

        /* hotkey not supported on 570 */
        tp_features.hotkey = hkey_handle != NULL;

        vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
                "hotkeys are %s\n",
                str_supported(tp_features.hotkey));

        if (!tp_features.hotkey)
                return 1;

        quirks = tpacpi_check_quirks(tpacpi_hotkey_qtable,
                                     ARRAY_SIZE(tpacpi_hotkey_qtable));

        tpacpi_disable_brightness_delay();

        /* MUST have enough space for all attributes to be added to
         * hotkey_dev_attributes */
        hotkey_dev_attributes = create_attr_set(
                                        ARRAY_SIZE(hotkey_attributes) + 2,
                                        NULL);
        if (!hotkey_dev_attributes)
                return -ENOMEM;
        res = add_many_to_attr_set(hotkey_dev_attributes,
                        hotkey_attributes,
                        ARRAY_SIZE(hotkey_attributes));
        if (res)
                goto err_exit;

        /* mask not supported on 600e/x, 770e, 770x, A21e, A2xm/p,
           A30, R30, R31, T20-22, X20-21, X22-24.  Detected by checking
           for HKEY interface version 0x100 */
        if (acpi_evalf(hkey_handle, &hkeyv, "MHKV", "qd")) {
                vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
                            "firmware HKEY interface version: 0x%x\n",
                            hkeyv);

                switch (hkeyv >> 8) {
                case 1:
                        /*
                         * MHKV 0x100 in A31, R40, R40e,
                         * T4x, X31, and later
                         */

                        /* Paranoia check AND init hotkey_all_mask */
                        if (!acpi_evalf(hkey_handle, &hotkey_all_mask,
                                        "MHKA", "qd")) {
                                pr_err("missing MHKA handler, please report this to %s\n",
                                       TPACPI_MAIL);
                                /* Fallback: pre-init for FN+F3,F4,F12 */
                                hotkey_all_mask = 0x080cU;
                        } else {
                                tp_features.hotkey_mask = 1;
                        }
                        break;

                case 2:
                        /*
                         * MHKV 0x200 in X1, T460s, X260, T560, X1 Tablet (2016)
                         */

                        /* Paranoia check AND init hotkey_all_mask */
                        if (!acpi_evalf(hkey_handle, &hotkey_all_mask,
                                        "MHKA", "dd", 1)) {
                                pr_err("missing MHKA handler, please report this to %s\n",
                                       TPACPI_MAIL);
                                /* Fallback: pre-init for FN+F3,F4,F12 */
                                hotkey_all_mask = 0x080cU;
                        } else {
                                tp_features.hotkey_mask = 1;
                        }

                        /*
                         * Check if we have an adaptive keyboard, like on the
                         * Lenovo Carbon X1 2014 (2nd Gen).
                         */
                        if (acpi_evalf(hkey_handle, &hotkey_adaptive_all_mask,
                                       "MHKA", "dd", 2)) {
                                if (hotkey_adaptive_all_mask != 0) {
                                        tp_features.has_adaptive_kbd = true;
                                        res = sysfs_create_group(
                                                &tpacpi_pdev->dev.kobj,
                                                &adaptive_kbd_attr_group);
                                        if (res)
                                                goto err_exit;
                                }
                        } else {
                                tp_features.has_adaptive_kbd = false;
                                hotkey_adaptive_all_mask = 0x0U;
                        }
                        break;

                default:
                        pr_err("unknown version of the HKEY interface: 0x%x\n",
                               hkeyv);
                        pr_err("please report this to %s\n", TPACPI_MAIL);
                        break;
                }
        }

        vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
                "hotkey masks are %s\n",
                str_supported(tp_features.hotkey_mask));

        /* Init hotkey_all_mask if not initialized yet */
        if (!tp_features.hotkey_mask && !hotkey_all_mask &&
            (quirks & TPACPI_HK_Q_INIMASK))
                hotkey_all_mask = 0x080cU;  /* FN+F12, FN+F4, FN+F3 */

        /* Init hotkey_acpi_mask and hotkey_orig_mask */
        if (tp_features.hotkey_mask) {
                /* hotkey_source_mask *must* be zero for
                 * the first hotkey_mask_get to return hotkey_orig_mask */
                res = hotkey_mask_get();
                if (res)
                        goto err_exit;

                hotkey_orig_mask = hotkey_acpi_mask;
        } else {
                hotkey_orig_mask = hotkey_all_mask;
                hotkey_acpi_mask = hotkey_all_mask;
        }

#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
        if (dbg_wlswemul) {
                tp_features.hotkey_wlsw = 1;
                radiosw_state = !!tpacpi_wlsw_emulstate;
                pr_info("radio switch emulation enabled\n");
        } else
#endif
        /* Not all thinkpads have a hardware radio switch */
        if (acpi_evalf(hkey_handle, &status, "WLSW", "qd")) {
                tp_features.hotkey_wlsw = 1;
                radiosw_state = !!status;
                pr_info("radio switch found; radios are %s\n",
                        enabled(status, 0));
        }
        if (tp_features.hotkey_wlsw)
                res = add_to_attr_set(hotkey_dev_attributes,
                                &dev_attr_hotkey_radio_sw.attr);

        res = hotkey_init_tablet_mode();
        if (res < 0)
                goto err_exit;

        tabletsw_state = res;

        res = register_attr_set_with_sysfs(hotkey_dev_attributes,
                                           &tpacpi_pdev->dev.kobj);
        if (res)
                goto err_exit;

        /* Set up key map */
        keymap_id = tpacpi_check_quirks(tpacpi_keymap_qtable,
                                        ARRAY_SIZE(tpacpi_keymap_qtable));
        BUG_ON(keymap_id >= ARRAY_SIZE(tpacpi_keymaps));
        dbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
                   "using keymap number %lu\n", keymap_id);

        hotkey_keycode_map = kmemdup(&tpacpi_keymaps[keymap_id],
                        TPACPI_HOTKEY_MAP_SIZE, GFP_KERNEL);
        if (!hotkey_keycode_map) {
                pr_err("failed to allocate memory for key map\n");
                res = -ENOMEM;
                goto err_exit;
        }

        input_set_capability(tpacpi_inputdev, EV_MSC, MSC_SCAN);
        tpacpi_inputdev->keycodesize = TPACPI_HOTKEY_MAP_TYPESIZE;
        tpacpi_inputdev->keycodemax = TPACPI_HOTKEY_MAP_LEN;
        tpacpi_inputdev->keycode = hotkey_keycode_map;
        for (i = 0; i < TPACPI_HOTKEY_MAP_LEN; i++) {
                if (hotkey_keycode_map[i] != KEY_RESERVED) {
                        input_set_capability(tpacpi_inputdev, EV_KEY,
                                                hotkey_keycode_map[i]);
                } else {
                        if (i < sizeof(hotkey_reserved_mask)*8)
                                hotkey_reserved_mask |= 1 << i;
                }
        }

        if (tp_features.hotkey_wlsw) {
                input_set_capability(tpacpi_inputdev, EV_SW, SW_RFKILL_ALL);
                input_report_switch(tpacpi_inputdev,
                                    SW_RFKILL_ALL, radiosw_state);
        }
        if (tp_features.hotkey_tablet) {
                input_set_capability(tpacpi_inputdev, EV_SW, SW_TABLET_MODE);
                input_report_switch(tpacpi_inputdev,
                                    SW_TABLET_MODE, tabletsw_state);
        }

        /* Do not issue duplicate brightness change events to
         * userspace. tpacpi_detect_brightness_capabilities() must have
         * been called before this point  */
        if (acpi_video_get_backlight_type() != acpi_backlight_vendor) {
                pr_info("This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver\n");
                pr_notice("Disabling thinkpad-acpi brightness events by default...\n");

                /* Disable brightness up/down on Lenovo thinkpads when
                 * ACPI is handling them, otherwise it is plain impossible
                 * for userspace to do something even remotely sane */
                hotkey_reserved_mask |=
                        (1 << TP_ACPI_HOTKEYSCAN_FNHOME)
                        | (1 << TP_ACPI_HOTKEYSCAN_FNEND);
                hotkey_unmap(TP_ACPI_HOTKEYSCAN_FNHOME);
                hotkey_unmap(TP_ACPI_HOTKEYSCAN_FNEND);
        }

#ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
        hotkey_source_mask = TPACPI_HKEY_NVRAM_GOOD_MASK
                                & ~hotkey_all_mask
                                & ~hotkey_reserved_mask;

        vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
                    "hotkey source mask 0x%08x, polling freq %u\n",
                    hotkey_source_mask, hotkey_poll_freq);
#endif

        dbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
                        "enabling firmware HKEY event interface...\n");
        res = hotkey_status_set(true);
        if (res) {
                hotkey_exit();
                return res;
        }
        res = hotkey_mask_set(((hotkey_all_mask & ~hotkey_reserved_mask)
                               | hotkey_driver_mask)
                              & ~hotkey_source_mask);
        if (res < 0 && res != -ENXIO) {
                hotkey_exit();
                return res;
        }
        hotkey_user_mask = (hotkey_acpi_mask | hotkey_source_mask)
                                & ~hotkey_reserved_mask;
        vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
                "initial masks: user=0x%08x, fw=0x%08x, poll=0x%08x\n",
                hotkey_user_mask, hotkey_acpi_mask, hotkey_source_mask);

        tpacpi_inputdev->open = &hotkey_inputdev_open;
        tpacpi_inputdev->close = &hotkey_inputdev_close;

        hotkey_poll_setup_safe(true);

        return 0;

err_exit:
        delete_attr_set(hotkey_dev_attributes, &tpacpi_pdev->dev.kobj);
        sysfs_remove_group(&tpacpi_pdev->dev.kobj,
                        &adaptive_kbd_attr_group);

        hotkey_dev_attributes = NULL;

        return (res < 0) ? res : 1;
}

/* Thinkpad X1 Carbon support 5 modes including Home mode, Web browser
 * mode, Web conference mode, Function mode and Lay-flat mode.
 * We support Home mode and Function mode currently.
 *
 * Will consider support rest of modes in future.
 *
 */
static const int adaptive_keyboard_modes[] = {
        HOME_MODE,
/*      WEB_BROWSER_MODE = 2,
        WEB_CONFERENCE_MODE = 3, */
        FUNCTION_MODE
};

#define DFR_CHANGE_ROW                  0x101
#define DFR_SHOW_QUICKVIEW_ROW          0x102
#define FIRST_ADAPTIVE_KEY              0x103

/* press Fn key a while second, it will switch to Function Mode. Then
 * release Fn key, previous mode be restored.
 */
static bool adaptive_keyboard_mode_is_saved;
static int adaptive_keyboard_prev_mode;

static int adaptive_keyboard_get_mode(void)
{
        int mode = 0;

        if (!acpi_evalf(hkey_handle, &mode, "GTRW", "dd", 0)) {
                pr_err("Cannot read adaptive keyboard mode\n");
                return -EIO;
        }

        return mode;
}

static int adaptive_keyboard_set_mode(int new_mode)
{
        if (new_mode < 0 ||
                new_mode > LAYFLAT_MODE)
                return -EINVAL;

        if (!acpi_evalf(hkey_handle, NULL, "STRW", "vd", new_mode)) {
                pr_err("Cannot set adaptive keyboard mode\n");
                return -EIO;
        }

        return 0;
}

static int adaptive_keyboard_get_next_mode(int mode)
{
        size_t i;
        size_t max_mode = ARRAY_SIZE(adaptive_keyboard_modes) - 1;

        for (i = 0; i <= max_mode; i++) {
                if (adaptive_keyboard_modes[i] == mode)
                        break;
        }

        if (i >= max_mode)
                i = 0;
        else
                i++;

        return adaptive_keyboard_modes[i];
}

static bool adaptive_keyboard_hotkey_notify_hotkey(unsigned int scancode)
{
        int current_mode = 0;
        int new_mode = 0;
        int keycode;

        switch (scancode) {
        case DFR_CHANGE_ROW:
                if (adaptive_keyboard_mode_is_saved) {
                        new_mode = adaptive_keyboard_prev_mode;
                        adaptive_keyboard_mode_is_saved = false;
                } else {
                        current_mode = adaptive_keyboard_get_mode();
                        if (current_mode < 0)
                                return false;
                        new_mode = adaptive_keyboard_get_next_mode(
                                        current_mode);
                }

                if (adaptive_keyboard_set_mode(new_mode) < 0)
                        return false;

                return true;

        case DFR_SHOW_QUICKVIEW_ROW:
                current_mode = adaptive_keyboard_get_mode();
                if (current_mode < 0)
                        return false;

                adaptive_keyboard_prev_mode = current_mode;
                adaptive_keyboard_mode_is_saved = true;

                if (adaptive_keyboard_set_mode (FUNCTION_MODE) < 0)
                        return false;
                return true;

        default:
                if (scancode < FIRST_ADAPTIVE_KEY ||
                    scancode >= FIRST_ADAPTIVE_KEY +
                    TP_ACPI_HOTKEYSCAN_EXTENDED_START -
                    TP_ACPI_HOTKEYSCAN_ADAPTIVE_START) {
                        pr_info("Unhandled adaptive keyboard key: 0x%x\n",
                                scancode);
                        return false;
                }
                keycode = hotkey_keycode_map[scancode - FIRST_ADAPTIVE_KEY +
                                             TP_ACPI_HOTKEYSCAN_ADAPTIVE_START];
                if (keycode != KEY_RESERVED) {
                        mutex_lock(&tpacpi_inputdev_send_mutex);

                        input_report_key(tpacpi_inputdev, keycode, 1);
                        input_sync(tpacpi_inputdev);

                        input_report_key(tpacpi_inputdev, keycode, 0);
                        input_sync(tpacpi_inputdev);

                        mutex_unlock(&tpacpi_inputdev_send_mutex);
                }
                return true;
        }
}

static bool hotkey_notify_hotkey(const u32 hkey,
                                 bool *send_acpi_ev,
                                 bool *ignore_acpi_ev)
{
        /* 0x1000-0x1FFF: key presses */
        unsigned int scancode = hkey & 0xfff;
        *send_acpi_ev = true;
        *ignore_acpi_ev = false;

        /*
         * Original events are in the 0x10XX range, the adaptive keyboard
         * found in 2014 X1 Carbon emits events are of 0x11XX. In 2017
         * models, additional keys are emitted through 0x13XX.
         */
        switch ((hkey >> 8) & 0xf) {
        case 0:
                if (scancode > 0 &&
                    scancode <= TP_ACPI_HOTKEYSCAN_ADAPTIVE_START) {
                        /* HKEY event 0x1001 is scancode 0x00 */
                        scancode--;
                        if (!(hotkey_source_mask & (1 << scancode))) {
                                tpacpi_input_send_key_masked(scancode);
                                *send_acpi_ev = false;
                        } else {
                                *ignore_acpi_ev = true;
                        }
                        return true;
                }
                break;

        case 1:
                return adaptive_keyboard_hotkey_notify_hotkey(scancode);

        case 3:
                /* Extended keycodes start at 0x300 and our offset into the map
                 * TP_ACPI_HOTKEYSCAN_EXTENDED_START. The calculated scancode
                 * will be positive, but might not be in the correct range.
                 */
                scancode -= (0x300 - TP_ACPI_HOTKEYSCAN_EXTENDED_START);
                if (scancode >= TP_ACPI_HOTKEYSCAN_EXTENDED_START &&
                    scancode < TPACPI_HOTKEY_MAP_LEN) {
                        tpacpi_input_send_key(scancode);
                        return true;
                }
                break;
        }

        return false;
}

static bool hotkey_notify_wakeup(const u32 hkey,
                                 bool *send_acpi_ev,
                                 bool *ignore_acpi_ev)
{
        /* 0x2000-0x2FFF: Wakeup reason */
        *send_acpi_ev = true;
        *ignore_acpi_ev = false;

        switch (hkey) {
        case TP_HKEY_EV_WKUP_S3_UNDOCK: /* suspend, undock */
        case TP_HKEY_EV_WKUP_S4_UNDOCK: /* hibernation, undock */
                hotkey_wakeup_reason = TP_ACPI_WAKEUP_UNDOCK;
                *ignore_acpi_ev = true;
                break;

        case TP_HKEY_EV_WKUP_S3_BAYEJ: /* suspend, bay eject */
        case TP_HKEY_EV_WKUP_S4_BAYEJ: /* hibernation, bay eject */
                hotkey_wakeup_reason = TP_ACPI_WAKEUP_BAYEJ;
                *ignore_acpi_ev = true;
                break;

        case TP_HKEY_EV_WKUP_S3_BATLOW: /* Battery on critical low level/S3 */
        case TP_HKEY_EV_WKUP_S4_BATLOW: /* Battery on critical low level/S4 */
                pr_alert("EMERGENCY WAKEUP: battery almost empty\n");
                /* how to auto-heal: */
                /* 2313: woke up from S3, go to S4/S5 */
                /* 2413: woke up from S4, go to S5 */
                break;

        default:
                return false;
        }

        if (hotkey_wakeup_reason != TP_ACPI_WAKEUP_NONE) {
                pr_info("woke up due to a hot-unplug request...\n");
                hotkey_wakeup_reason_notify_change();
        }
        return true;
}

static bool hotkey_notify_dockevent(const u32 hkey,
                                 bool *send_acpi_ev,
                                 bool *ignore_acpi_ev)
{
        /* 0x4000-0x4FFF: dock-related events */
        *send_acpi_ev = true;
        *ignore_acpi_ev = false;

        switch (hkey) {
        case TP_HKEY_EV_UNDOCK_ACK:
                /* ACPI undock operation completed after wakeup */
                hotkey_autosleep_ack = 1;
                pr_info("undocked\n");
                hotkey_wakeup_hotunplug_complete_notify_change();
                return true;

        case TP_HKEY_EV_HOTPLUG_DOCK: /* docked to port replicator */
                pr_info("docked into hotplug port replicator\n");
                return true;
        case TP_HKEY_EV_HOTPLUG_UNDOCK: /* undocked from port replicator */
                pr_info("undocked from hotplug port replicator\n");
                return true;

        default:
                return false;
        }
}

static bool hotkey_notify_usrevent(const u32 hkey,