// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Acer WMI Laptop Extras
 *
 *  Copyright (C) 2007-2009     Carlos Corbacho <carlos@strangeworlds.co.uk>
 *
 *  Based on acer_acpi:
 *    Copyright (C) 2005-2007   E.M. Smith
 *    Copyright (C) 2007-2008   Carlos Corbacho <cathectic@gmail.com>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/dmi.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/leds.h>
#include <linux/platform_device.h>
#include <linux/acpi.h>
#include <linux/i8042.h>
#include <linux/rfkill.h>
#include <linux/workqueue.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <acpi/video.h>

MODULE_AUTHOR("Carlos Corbacho");
MODULE_DESCRIPTION("Acer Laptop WMI Extras Driver");
MODULE_LICENSE("GPL");

/*
 * Magic Number
 * Meaning is unknown - this number is required for writing to ACPI for AMW0
 * (it's also used in acerhk when directly accessing the BIOS)
 */
#define ACER_AMW0_WRITE 0x9610

/*
 * Bit masks for the AMW0 interface
 */
#define ACER_AMW0_WIRELESS_MASK  0x35
#define ACER_AMW0_BLUETOOTH_MASK 0x34
#define ACER_AMW0_MAILLED_MASK   0x31

/*
 * Method IDs for WMID interface
 */
#define ACER_WMID_GET_WIRELESS_METHODID         1
#define ACER_WMID_GET_BLUETOOTH_METHODID        2
#define ACER_WMID_GET_BRIGHTNESS_METHODID       3
#define ACER_WMID_SET_WIRELESS_METHODID         4
#define ACER_WMID_SET_BLUETOOTH_METHODID        5
#define ACER_WMID_SET_BRIGHTNESS_METHODID       6
#define ACER_WMID_GET_THREEG_METHODID           10
#define ACER_WMID_SET_THREEG_METHODID           11

/*
 * Acer ACPI method GUIDs
 */
#define AMW0_GUID1              "67C3371D-95A3-4C37-BB61-DD47B491DAAB"
#define AMW0_GUID2              "431F16ED-0C2B-444C-B267-27DEB140CF9C"
#define WMID_GUID1              "6AF4F258-B401-42FD-BE91-3D4AC2D7C0D3"
#define WMID_GUID2              "95764E09-FB56-4E83-B31A-37761F60994A"
#define WMID_GUID3              "61EF69EA-865C-4BC3-A502-A0DEBA0CB531"

/*
 * Acer ACPI event GUIDs
 */
#define ACERWMID_EVENT_GUID "676AA15E-6A47-4D9F-A2CC-1E6D18D14026"

MODULE_ALIAS("wmi:67C3371D-95A3-4C37-BB61-DD47B491DAAB");
MODULE_ALIAS("wmi:6AF4F258-B401-42FD-BE91-3D4AC2D7C0D3");
MODULE_ALIAS("wmi:676AA15E-6A47-4D9F-A2CC-1E6D18D14026");

enum acer_wmi_event_ids {
        WMID_HOTKEY_EVENT = 0x1,
        WMID_ACCEL_EVENT = 0x5,
};

static const struct key_entry acer_wmi_keymap[] __initconst = {
        {KE_KEY, 0x01, {KEY_WLAN} },     /* WiFi */
        {KE_KEY, 0x03, {KEY_WLAN} },     /* WiFi */
        {KE_KEY, 0x04, {KEY_WLAN} },     /* WiFi */
        {KE_KEY, 0x12, {KEY_BLUETOOTH} },       /* BT */
        {KE_KEY, 0x21, {KEY_PROG1} },    /* Backup */
        {KE_KEY, 0x22, {KEY_PROG2} },    /* Arcade */
        {KE_KEY, 0x23, {KEY_PROG3} },    /* P_Key */
        {KE_KEY, 0x24, {KEY_PROG4} },    /* Social networking_Key */
        {KE_KEY, 0x29, {KEY_PROG3} },    /* P_Key for TM8372 */
        {KE_IGNORE, 0x41, {KEY_MUTE} },
        {KE_IGNORE, 0x42, {KEY_PREVIOUSSONG} },
        {KE_IGNORE, 0x4d, {KEY_PREVIOUSSONG} },
        {KE_IGNORE, 0x43, {KEY_NEXTSONG} },
        {KE_IGNORE, 0x4e, {KEY_NEXTSONG} },
        {KE_IGNORE, 0x44, {KEY_PLAYPAUSE} },
        {KE_IGNORE, 0x4f, {KEY_PLAYPAUSE} },
        {KE_IGNORE, 0x45, {KEY_STOP} },
        {KE_IGNORE, 0x50, {KEY_STOP} },
        {KE_IGNORE, 0x48, {KEY_VOLUMEUP} },
        {KE_IGNORE, 0x49, {KEY_VOLUMEDOWN} },
        {KE_IGNORE, 0x4a, {KEY_VOLUMEDOWN} },
        {KE_IGNORE, 0x61, {KEY_SWITCHVIDEOMODE} },
        {KE_IGNORE, 0x62, {KEY_BRIGHTNESSUP} },
        {KE_IGNORE, 0x63, {KEY_BRIGHTNESSDOWN} },
        {KE_KEY, 0x64, {KEY_SWITCHVIDEOMODE} }, /* Display Switch */
        {KE_IGNORE, 0x81, {KEY_SLEEP} },
        {KE_KEY, 0x82, {KEY_TOUCHPAD_TOGGLE} }, /* Touch Pad Toggle */
        {KE_IGNORE, 0x84, {KEY_KBDILLUMTOGGLE} }, /* Automatic Keyboard background light toggle */
        {KE_KEY, KEY_TOUCHPAD_ON, {KEY_TOUCHPAD_ON} },
        {KE_KEY, KEY_TOUCHPAD_OFF, {KEY_TOUCHPAD_OFF} },
        {KE_IGNORE, 0x83, {KEY_TOUCHPAD_TOGGLE} },
        {KE_KEY, 0x85, {KEY_TOUCHPAD_TOGGLE} },
        {KE_KEY, 0x86, {KEY_WLAN} },
        {KE_KEY, 0x87, {KEY_POWER} },
        {KE_END, 0}
};

static struct input_dev *acer_wmi_input_dev;
static struct input_dev *acer_wmi_accel_dev;

struct event_return_value {
        u8 function;
        u8 key_num;
        u16 device_state;
        u32 reserved;
} __attribute__((packed));

/*
 * GUID3 Get Device Status device flags
 */
#define ACER_WMID3_GDS_WIRELESS         (1<<0)  /* WiFi */
#define ACER_WMID3_GDS_THREEG           (1<<6)  /* 3G */
#define ACER_WMID3_GDS_WIMAX            (1<<7)  /* WiMAX */
#define ACER_WMID3_GDS_BLUETOOTH        (1<<11) /* BT */
#define ACER_WMID3_GDS_RFBTN            (1<<14) /* RF Button */

#define ACER_WMID3_GDS_TOUCHPAD         (1<<1)  /* Touchpad */

/* Hotkey Customized Setting and Acer Application Status.
 * Set Device Default Value and Report Acer Application Status.
 * When Acer Application starts, it will run this method to inform
 * BIOS/EC that Acer Application is on.
 * App Status
 *      Bit[0]: Launch Manager Status
 *      Bit[1]: ePM Status
 *      Bit[2]: Device Control Status
 *      Bit[3]: Acer Power Button Utility Status
 *      Bit[4]: RF Button Status
 *      Bit[5]: ODD PM Status
 *      Bit[6]: Device Default Value Control
 *      Bit[7]: Hall Sensor Application Status
 */
struct func_input_params {
        u8 function_num;        /* Function Number */
        u16 commun_devices;     /* Communication type devices default status */
        u16 devices;            /* Other type devices default status */
        u8 app_status;          /* Acer Device Status. LM, ePM, RF Button... */
        u8 app_mask;            /* Bit mask to app_status */
        u8 reserved;
} __attribute__((packed));

struct func_return_value {
        u8 error_code;          /* Error Code */
        u8 ec_return_value;     /* EC Return Value */
        u16 reserved;
} __attribute__((packed));

struct wmid3_gds_set_input_param {     /* Set Device Status input parameter */
        u8 function_num;        /* Function Number */
        u8 hotkey_number;       /* Hotkey Number */
        u16 devices;            /* Set Device */
        u8 volume_value;        /* Volume Value */
} __attribute__((packed));

struct wmid3_gds_get_input_param {     /* Get Device Status input parameter */
        u8 function_num;        /* Function Number */
        u8 hotkey_number;       /* Hotkey Number */
        u16 devices;            /* Get Device */
} __attribute__((packed));

struct wmid3_gds_return_value { /* Get Device Status return value*/
        u8 error_code;          /* Error Code */
        u8 ec_return_value;     /* EC Return Value */
        u16 devices;            /* Current Device Status */
        u32 reserved;
} __attribute__((packed));

struct hotkey_function_type_aa {
        u8 type;
        u8 length;
        u16 handle;
        u16 commun_func_bitmap;
        u16 application_func_bitmap;
        u16 media_func_bitmap;
        u16 display_func_bitmap;
        u16 others_func_bitmap;
        u8 commun_fn_key_number;
} __attribute__((packed));

/*
 * Interface capability flags
 */
#define ACER_CAP_MAILLED                (1<<0)
#define ACER_CAP_WIRELESS               (1<<1)
#define ACER_CAP_BLUETOOTH              (1<<2)
#define ACER_CAP_BRIGHTNESS             (1<<3)
#define ACER_CAP_THREEG                 (1<<4)
#define ACER_CAP_ACCEL                  (1<<5)
#define ACER_CAP_RFBTN                  (1<<6)
#define ACER_CAP_ANY                    (0xFFFFFFFF)

/*
 * Interface type flags
 */
enum interface_flags {
        ACER_AMW0,
        ACER_AMW0_V2,
        ACER_WMID,
        ACER_WMID_v2,
};

#define ACER_DEFAULT_WIRELESS  0
#define ACER_DEFAULT_BLUETOOTH 0
#define ACER_DEFAULT_MAILLED   0
#define ACER_DEFAULT_THREEG    0

static int max_brightness = 0xF;

static int mailled = -1;
static int brightness = -1;
static int threeg = -1;
static int force_series;
static bool ec_raw_mode;
static bool has_type_aa;
static u16 commun_func_bitmap;
static u8 commun_fn_key_number;

module_param(mailled, int, 0444);
module_param(brightness, int, 0444);
module_param(threeg, int, 0444);
module_param(force_series, int, 0444);
module_param(ec_raw_mode, bool, 0444);
MODULE_PARM_DESC(mailled, "Set initial state of Mail LED");
MODULE_PARM_DESC(brightness, "Set initial LCD backlight brightness");
MODULE_PARM_DESC(threeg, "Set initial state of 3G hardware");
MODULE_PARM_DESC(force_series, "Force a different laptop series");
MODULE_PARM_DESC(ec_raw_mode, "Enable EC raw mode");

struct acer_data {
        int mailled;
        int threeg;
        int brightness;
};

struct acer_debug {
        struct dentry *root;
        u32 wmid_devices;
};

static struct rfkill *wireless_rfkill;
static struct rfkill *bluetooth_rfkill;
static struct rfkill *threeg_rfkill;
static bool rfkill_inited;

/* Each low-level interface must define at least some of the following */
struct wmi_interface {
        /* The WMI device type */
        u32 type;

        /* The capabilities this interface provides */
        u32 capability;

        /* Private data for the current interface */
        struct acer_data data;

        /* debugfs entries associated with this interface */
        struct acer_debug debug;
};

/* The static interface pointer, points to the currently detected interface */
static struct wmi_interface *interface;

/*
 * Embedded Controller quirks
 * Some laptops require us to directly access the EC to either enable or query
 * features that are not available through WMI.
 */

struct quirk_entry {
        u8 wireless;
        u8 mailled;
        s8 brightness;
        u8 bluetooth;
};

static struct quirk_entry *quirks;

static void __init set_quirks(void)
{
        if (!interface)
                return;

        if (quirks->mailled)
                interface->capability |= ACER_CAP_MAILLED;

        if (quirks->brightness)
                interface->capability |= ACER_CAP_BRIGHTNESS;
}

static int __init dmi_matched(const struct dmi_system_id *dmi)
{
        quirks = dmi->driver_data;
        return 1;
}

static struct quirk_entry quirk_unknown = {
};

static struct quirk_entry quirk_acer_aspire_1520 = {
        .brightness = -1,
};

static struct quirk_entry quirk_acer_travelmate_2490 = {
        .mailled = 1,
};

/* This AMW0 laptop has no bluetooth */
static struct quirk_entry quirk_medion_md_98300 = {
        .wireless = 1,
};

static struct quirk_entry quirk_fujitsu_amilo_li_1718 = {
        .wireless = 2,
};

static struct quirk_entry quirk_lenovo_ideapad_s205 = {
        .wireless = 3,
};

/* The Aspire One has a dummy ACPI-WMI interface - disable it */
static const struct dmi_system_id acer_blacklist[] __initconst = {
        {
                .ident = "Acer Aspire One (SSD)",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
                },
        },
        {
                .ident = "Acer Aspire One (HDD)",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "AOA150"),
                },
        },
        {}
};

static const struct dmi_system_id amw0_whitelist[] __initconst = {
        {
                .ident = "Acer",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                },
        },
        {
                .ident = "Gateway",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Gateway"),
                },
        },
        {
                .ident = "Packard Bell",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"),
                },
        },
        {}
};

/*
 * This quirk table is only for Acer/Gateway/Packard Bell family
 * that those machines are supported by acer-wmi driver.
 */
static const struct dmi_system_id acer_quirks[] __initconst = {
        {
                .callback = dmi_matched,
                .ident = "Acer Aspire 1360",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 1360"),
                },
                .driver_data = &quirk_acer_aspire_1520,
        },
        {
                .callback = dmi_matched,
                .ident = "Acer Aspire 1520",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 1520"),
                },
                .driver_data = &quirk_acer_aspire_1520,
        },
        {
                .callback = dmi_matched,
                .ident = "Acer Aspire 3100",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3100"),
                },
                .driver_data = &quirk_acer_travelmate_2490,
        },
        {
                .callback = dmi_matched,
                .ident = "Acer Aspire 3610",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3610"),
                },
                .driver_data = &quirk_acer_travelmate_2490,
        },
        {
                .callback = dmi_matched,
                .ident = "Acer Aspire 5100",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5100"),
                },
                .driver_data = &quirk_acer_travelmate_2490,
        },
        {
                .callback = dmi_matched,
                .ident = "Acer Aspire 5610",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5610"),
                },
                .driver_data = &quirk_acer_travelmate_2490,
        },
        {
                .callback = dmi_matched,
                .ident = "Acer Aspire 5630",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5630"),
                },
                .driver_data = &quirk_acer_travelmate_2490,
        },
        {
                .callback = dmi_matched,
                .ident = "Acer Aspire 5650",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5650"),
                },
                .driver_data = &quirk_acer_travelmate_2490,
        },
        {
                .callback = dmi_matched,
                .ident = "Acer Aspire 5680",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5680"),
                },
                .driver_data = &quirk_acer_travelmate_2490,
        },
        {
                .callback = dmi_matched,
                .ident = "Acer Aspire 9110",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 9110"),
                },
                .driver_data = &quirk_acer_travelmate_2490,
        },
        {
                .callback = dmi_matched,
                .ident = "Acer TravelMate 2490",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 2490"),
                },
                .driver_data = &quirk_acer_travelmate_2490,
        },
        {
                .callback = dmi_matched,
                .ident = "Acer TravelMate 4200",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4200"),
                },
                .driver_data = &quirk_acer_travelmate_2490,
        },
        {}
};

/*
 * This quirk list is for those non-acer machines that have AMW0_GUID1
 * but supported by acer-wmi in past days. Keeping this quirk list here
 * is only for backward compatible. Please do not add new machine to
 * here anymore. Those non-acer machines should be supported by
 * appropriate wmi drivers.
 */
static const struct dmi_system_id non_acer_quirks[] __initconst = {
        {
                .callback = dmi_matched,
                .ident = "Fujitsu Siemens Amilo Li 1718",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "AMILO Li 1718"),
                },
                .driver_data = &quirk_fujitsu_amilo_li_1718,
        },
        {
                .callback = dmi_matched,
                .ident = "Medion MD 98300",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "WAM2030"),
                },
                .driver_data = &quirk_medion_md_98300,
        },
        {
                .callback = dmi_matched,
                .ident = "Lenovo Ideapad S205",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "10382LG"),
                },
                .driver_data = &quirk_lenovo_ideapad_s205,
        },
        {
                .callback = dmi_matched,
                .ident = "Lenovo Ideapad S205 (Brazos)",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Brazos"),
                },
                .driver_data = &quirk_lenovo_ideapad_s205,
        },
        {
                .callback = dmi_matched,
                .ident = "Lenovo 3000 N200",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "0687A31"),
                },
                .driver_data = &quirk_fujitsu_amilo_li_1718,
        },
        {
                .callback = dmi_matched,
                .ident = "Lenovo Ideapad S205-10382JG",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "10382JG"),
                },
                .driver_data = &quirk_lenovo_ideapad_s205,
        },
        {
                .callback = dmi_matched,
                .ident = "Lenovo Ideapad S205-1038DPG",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "1038DPG"),
                },
                .driver_data = &quirk_lenovo_ideapad_s205,
        },
        {}
};

static int __init
video_set_backlight_video_vendor(const struct dmi_system_id *d)
{
        interface->capability &= ~ACER_CAP_BRIGHTNESS;
        pr_info("Brightness must be controlled by generic video driver\n");
        return 0;
}

static const struct dmi_system_id video_vendor_dmi_table[] __initconst = {
        {
                .callback = video_set_backlight_video_vendor,
                .ident = "Acer TravelMate 4750",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
                },
        },
        {
                .callback = video_set_backlight_video_vendor,
                .ident = "Acer Extensa 5235",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
                },
        },
        {
                .callback = video_set_backlight_video_vendor,
                .ident = "Acer TravelMate 5760",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
                },
        },
        {
                .callback = video_set_backlight_video_vendor,
                .ident = "Acer Aspire 5750",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
                },
        },
        {
                .callback = video_set_backlight_video_vendor,
                .ident = "Acer Aspire 5741",
                .matches = {
                        DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
                },
        },
        {
                /*
                 * Note no video_set_backlight_video_vendor, we must use the
                 * acer interface, as there is no native backlight interface.
                 */
                .ident = "Acer KAV80",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
                },
        },
        {}
};

/* Find which quirks are needed for a particular vendor/ model pair */
static void __init find_quirks(void)
{
        if (!force_series) {
                dmi_check_system(acer_quirks);
                dmi_check_system(non_acer_quirks);
        } else if (force_series == 2490) {
                quirks = &quirk_acer_travelmate_2490;
        }

        if (quirks == NULL)
                quirks = &quirk_unknown;

        set_quirks();
}

/*
 * General interface convenience methods
 */

static bool has_cap(u32 cap)
{
        return interface->capability & cap;
}

/*
 * AMW0 (V1) interface
 */
struct wmab_args {
        u32 eax;
        u32 ebx;
        u32 ecx;
        u32 edx;
};

struct wmab_ret {
        u32 eax;
        u32 ebx;
        u32 ecx;
        u32 edx;
        u32 eex;
};

static acpi_status wmab_execute(struct wmab_args *regbuf,
struct acpi_buffer *result)
{
        struct acpi_buffer input;
        acpi_status status;
        input.length = sizeof(struct wmab_args);
        input.pointer = (u8 *)regbuf;

        status = wmi_evaluate_method(AMW0_GUID1, 0, 1, &input, result);

        return status;
}

static acpi_status AMW0_get_u32(u32 *value, u32 cap)
{
        int err;
        u8 result;

        switch (cap) {
        case ACER_CAP_MAILLED:
                switch (quirks->mailled) {
                default:
                        err = ec_read(0xA, &result);
                        if (err)
                                return AE_ERROR;
                        *value = (result >> 7) & 0x1;
                        return AE_OK;
                }
                break;
        case ACER_CAP_WIRELESS:
                switch (quirks->wireless) {
                case 1:
                        err = ec_read(0x7B, &result);
                        if (err)
                                return AE_ERROR;
                        *value = result & 0x1;
                        return AE_OK;
                case 2:
                        err = ec_read(0x71, &result);
                        if (err)
                                return AE_ERROR;
                        *value = result & 0x1;
                        return AE_OK;
                case 3:
                        err = ec_read(0x78, &result);
                        if (err)
                                return AE_ERROR;
                        *value = result & 0x1;
                        return AE_OK;
                default:
                        err = ec_read(0xA, &result);
                        if (err)
                                return AE_ERROR;
                        *value = (result >> 2) & 0x1;
                        return AE_OK;
                }
                break;
        case ACER_CAP_BLUETOOTH:
                switch (quirks->bluetooth) {
                default:
                        err = ec_read(0xA, &result);
                        if (err)
                                return AE_ERROR;
                        *value = (result >> 4) & 0x1;
                        return AE_OK;
                }
                break;
        case ACER_CAP_BRIGHTNESS:
                switch (quirks->brightness) {
                default:
                        err = ec_read(0x83, &result);
                        if (err)
                                return AE_ERROR;
                        *value = result;
                        return AE_OK;
                }
                break;
        default:
                return AE_ERROR;
        }
        return AE_OK;
}

static acpi_status AMW0_set_u32(u32 value, u32 cap)
{
        struct wmab_args args;

        args.eax = ACER_AMW0_WRITE;
        args.ebx = value ? (1<<8) : 0;
        args.ecx = args.edx = 0;

        switch (cap) {
        case ACER_CAP_MAILLED:
                if (value > 1)
                        return AE_BAD_PARAMETER;
                args.ebx |= ACER_AMW0_MAILLED_MASK;
                break;
        case ACER_CAP_WIRELESS:
                if (value > 1)
                        return AE_BAD_PARAMETER;
                args.ebx |= ACER_AMW0_WIRELESS_MASK;
                break;
        case ACER_CAP_BLUETOOTH:
                if (value > 1)
                        return AE_BAD_PARAMETER;
                args.ebx |= ACER_AMW0_BLUETOOTH_MASK;
                break;
        case ACER_CAP_BRIGHTNESS:
                if (value > max_brightness)
                        return AE_BAD_PARAMETER;
                switch (quirks->brightness) {
                default:
                        return ec_write(0x83, value);
                        break;
                }
        default:
                return AE_ERROR;
        }

        /* Actually do the set */
        return wmab_execute(&args, NULL);
}

static acpi_status __init AMW0_find_mailled(void)
{
        struct wmab_args args;
        struct wmab_ret ret;
        acpi_status status = AE_OK;
        struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
        union acpi_object *obj;

        args.eax = 0x86;
        args.ebx = args.ecx = args.edx = 0;

        status = wmab_execute(&args, &out);
        if (ACPI_FAILURE(status))
                return status;

        obj = (union acpi_object *) out.pointer;
        if (obj && obj->type == ACPI_TYPE_BUFFER &&
        obj->buffer.length == sizeof(struct wmab_ret)) {
                ret = *((struct wmab_ret *) obj->buffer.pointer);
        } else {
                kfree(out.pointer);
                return AE_ERROR;
        }

        if (ret.eex & 0x1)
                interface->capability |= ACER_CAP_MAILLED;

        kfree(out.pointer);

        return AE_OK;
}

static const struct acpi_device_id norfkill_ids[] __initconst = {
        { "VPC2004", 0},
        { "IBM0068", 0},
        { "LEN0068", 0},
        { "SNY5001", 0},        /* sony-laptop in charge */
        { "HPQ6601", 0},
        { "", 0},
};

static int __init AMW0_set_cap_acpi_check_device(void)
{
        const struct acpi_device_id *id;

        for (id = norfkill_ids; id->id[0]; id++)
                if (acpi_dev_found(id->id))
                        return true;

        return false;
}

static acpi_status __init AMW0_set_capabilities(void)
{
        struct wmab_args args;
        struct wmab_ret ret;
        acpi_status status;
        struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
        union acpi_object *obj;

        /*
         * On laptops with this strange GUID (non Acer), normal probing doesn't
         * work.
         */
        if (wmi_has_guid(AMW0_GUID2)) {
                if ((quirks != &quirk_unknown) ||
                    !AMW0_set_cap_acpi_check_device())
                        interface->capability |= ACER_CAP_WIRELESS;
                return AE_OK;
        }

        args.eax = ACER_AMW0_WRITE;
        args.ecx = args.edx = 0;

        args.ebx = 0xa2 << 8;
        args.ebx |= ACER_AMW0_WIRELESS_MASK;

        status = wmab_execute(&args, &out);
        if (ACPI_FAILURE(status))
                return status;

        obj = out.pointer;
        if (obj && obj->type == ACPI_TYPE_BUFFER &&
        obj->buffer.length == sizeof(struct wmab_ret)) {
                ret = *((struct wmab_ret *) obj->buffer.pointer);
        } else {
                status = AE_ERROR;
                goto out;
        }

        if (ret.eax & 0x1)
                interface->capability |= ACER_CAP_WIRELESS;

        args.ebx = 2 << 8;
        args.ebx |= ACER_AMW0_BLUETOOTH_MASK;

        /*
         * It's ok to use existing buffer for next wmab_execute call.
         * But we need to kfree(out.pointer) if next wmab_execute fail.
         */
        status = wmab_execute(&args, &out);
        if (ACPI_FAILURE(status))
                goto out;

        obj = (union acpi_object *) out.pointer;
        if (obj && obj->type == ACPI_TYPE_BUFFER
        && obj->buffer.length == sizeof(struct wmab_ret)) {
                ret = *((struct wmab_ret *) obj->buffer.pointer);
        } else {
                status = AE_ERROR;
                goto out;
        }

        if (ret.eax & 0x1)
                interface->capability |= ACER_CAP_BLUETOOTH;

        /*
         * This appears to be safe to enable, since all Wistron based laptops
         * appear to use the same EC register for brightness, even if they
         * differ for wireless, etc
         */
        if (quirks->brightness >= 0)
                interface->capability |= ACER_CAP_BRIGHTNESS;

        status = AE_OK;
out:
        kfree(out.pointer);
        return status;
}

static struct wmi_interface AMW0_interface = {
        .type = ACER_AMW0,
};

static struct wmi_interface AMW0_V2_interface = {
        .type = ACER_AMW0_V2,
};

/*
 * New interface (The WMID interface)
 */
static acpi_status
WMI_execute_u32(u32 method_id, u32 in, u32 *out)
{
        struct acpi_buffer input = { (acpi_size) sizeof(u32), (void *)(&in) };
        struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
        union acpi_object *obj;
        u32 tmp = 0;
        acpi_status status;

        status = wmi_evaluate_method(WMID_GUID1, 0, method_id, &input, &result);

        if (ACPI_FAILURE(status))
                return status;

        obj = (union acpi_object *) result.pointer;
        if (obj) {
                if (obj->type == ACPI_TYPE_BUFFER &&
                        (obj->buffer.length == sizeof(u32) ||
                        obj->buffer.length == sizeof(u64))) {
                        tmp = *((u32 *) obj->buffer.pointer);
                } else if (obj->type == ACPI_TYPE_INTEGER) {
                        tmp = (u32) obj->integer.value;
                }
        }

        if (out)
                *out = tmp;

        kfree(result.pointer);

        return status;
}

static acpi_status WMID_get_u32(u32 *value, u32 cap)
{
        acpi_status status;
        u8 tmp;
        u32 result, method_id = 0;

        switch (cap) {
        case ACER_CAP_WIRELESS:
                method_id = ACER_WMID_GET_WIRELESS_METHODID;
                break;
        case ACER_CAP_BLUETOOTH:
                method_id = ACER_WMID_GET_BLUETOOTH_METHODID;
                break;
        case ACER_CAP_BRIGHTNESS:
                method_id = ACER_WMID_GET_BRIGHTNESS_METHODID;
                break;
        case ACER_CAP_THREEG:
                method_id = ACER_WMID_GET_THREEG_METHODID;
                break;
        case ACER_CAP_MAILLED:
                if (quirks->mailled == 1) {

                        ec_read(0x9f, &tmp);
                        *value = tmp & 0x1;
                        return 0;
                }
                fallthrough;
        default:
                return AE_ERROR;
        }
        status = WMI_execute_u32(method_id, 0, &result);

        if (ACPI_SUCCESS(status))
                *value = (u8)result;

        return status;
}

static acpi_status WMID_set_u32(u32 value, u32 cap)
{
        u32 method_id = 0;
        char param;

        switch (cap) {
        case ACER_CAP_BRIGHTNESS:
                if (value > max_brightness)
                        return AE_BAD_PARAMETER;
                method_id = ACER_WMID_SET_BRIGHTNESS_METHODID;
                break;
        case ACER_CAP_WIRELESS:
                if (value > 1)
                        return AE_BAD_PARAMETER;
                method_id = ACER_WMID_SET_WIRELESS_METHODID;
                break;
        case ACER_CAP_BLUETOOTH:
                if (value > 1)
                        return AE_BAD_PARAMETER;
                method_id = ACER_WMID_SET_BLUETOOTH_METHODID;
                break;
        case ACER_CAP_THREEG:
                if (value > 1)
                        return AE_BAD_PARAMETER;
                method_id = ACER_WMID_SET_THREEG_METHODID;
                break;
        case ACER_CAP_MAILLED:
                if (value > 1)
                        return AE_BAD_PARAMETER;
                if (quirks->mailled == 1) {
                        param = value ? 0x92 : 0x93;
                        i8042_lock_chip();
                        i8042_command(&param, 0x1059);
                        i8042_unlock_chip();
                        return 0;
                }
                break;
        default:
                return AE_ERROR;
        }
        return WMI_execute_u32(method_id, (u32)value, NULL);
}

static acpi_status wmid3_get_device_status(u32 *value, u16 device)
{
        struct wmid3_gds_return_value return_value;
        acpi_status status;
        union acpi_object *obj;
        struct wmid3_gds_get_input_param params = {
                .function_num = 0x1,
                .hotkey_number = commun_fn_key_number,
                .devices = device,
        };
        struct acpi_buffer input = {
                sizeof(struct wmid3_gds_get_input_param),
                &params
        };
        struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };

        status = wmi_evaluate_method(WMID_GUID3, 0, 0x2, &input, &output);
        if (ACPI_FAILURE(status))
                return status;

        obj = output.pointer;

        if (!obj)
                return AE_ERROR;
        else if (obj->type != ACPI_TYPE_BUFFER) {
                kfree(obj);
                return AE_ERROR;
        }
        if (obj->buffer.length != 8) {
                pr_warn("Unknown buffer length %d\n", obj->buffer.length);
                kfree(obj);
                return AE_ERROR;
        }

        return_value = *((struct wmid3_gds_return_value *)obj->buffer.pointer);
        kfree(obj);

        if (return_value.error_code || return_value.ec_return_value)
                pr_warn("Get 0x%x Device Status failed: 0x%x - 0x%x\n",
                        device,
                        return_value.error_code,
                        return_value.ec_return_value);
        else
                *value = !!(return_value.devices & device);

        return status;
}

static acpi_status wmid_v2_get_u32(u32 *value, u32 cap)
{
        u16 device;

        switch (cap) {
        case ACER_CAP_WIRELESS:
                device = ACER_WMID3_GDS_WIRELESS;
                break;
        case ACER_CAP_BLUETOOTH:
                device = ACER_WMID3_GDS_BLUETOOTH;
                break;
        case ACER_CAP_THREEG:
                device = ACER_WMID3_GDS_THREEG;
                break;
        default:
                return AE_ERROR;
        }
        return wmid3_get_device_status(value, device);
}

static acpi_status wmid3_set_device_status(u32 value, u16 device)
{
        struct wmid3_gds_return_value return_value;
        acpi_status status;
        union acpi_object *obj;
        u16 devices;
        struct wmid3_gds_get_input_param get_params = {
                .function_num = 0x1,
                .hotkey_number = commun_fn_key_number,
                .devices = commun_func_bitmap,
        };
        struct acpi_buffer get_input = {
                sizeof(struct wmid3_gds_get_input_param),
                &get_params
        };
        struct wmid3_gds_set_input_param set_params = {
                .function_num = 0x2,
                .hotkey_number = commun_fn_key_number,
                .devices = commun_func_bitmap,
        };
        struct acpi_buffer set_input = {
                sizeof(struct wmid3_gds_set_input_param),
                &set_params
        };
        struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
        struct acpi_buffer output2 = { ACPI_ALLOCATE_BUFFER, NULL };

        status = wmi_evaluate_method(WMID_GUID3, 0, 0x2, &get_input, &output);
        if (ACPI_FAILURE(status))
                return status;

        obj = output.pointer;

        if (!obj)
                return AE_ERROR;
        else if (obj->type != ACPI_TYPE_BUFFER) {
                kfree(obj);
                return AE_ERROR;
        }
        if (obj->buffer.length != 8) {
                pr_warn("Unknown buffer length %d\n", obj->buffer.length);
                kfree(obj);
                return AE_ERROR;
        }

        return_value = *((struct wmid3_gds_return_value *)obj->buffer.pointer);
        kfree(obj);

        if (return_value.error_code || return_value.ec_return_value) {
                pr_warn("Get Current Device Status failed: 0x%x - 0x%x\n",
                        return_value.error_code,
                        return_value.ec_return_value);
                return status;
        }

        devices = return_value.devices;
        set_params.devices = (value) ? (devices | device) : (devices & ~device);

        status = wmi_evaluate_method(WMID_GUID3, 0, 0x1, &set_input, &output2);
        if (ACPI_FAILURE(status))
                return status;

        obj = output2.pointer;

        if (!obj)
                return AE_ERROR;
        else if (obj->type != ACPI_TYPE_BUFFER) {
                kfree(obj);
                return AE_ERROR;
        }
        if (obj->buffer.length != 4) {
                pr_warn("Unknown buffer length %d\n", obj->buffer.length);
                kfree(obj);
                return AE_ERROR;
        }

        return_value = *((struct wmid3_gds_return_value *)obj->buffer.pointer);
        kfree(obj);

        if (return_value.error_code || return_value.ec_return_value)
                pr_warn("Set Device Status failed: 0x%x - 0x%x\n",
                        return_value.error_code,
                        return_value.ec_return_value);

        return status;
}

static acpi_status wmid_v2_set_u32(u32 value, u32 cap)
{
        u16 device;

        switch (cap) {
        case ACER_CAP_WIRELESS:
                device = ACER_WMID3_GDS_WIRELESS;
                break;
        case ACER_CAP_BLUETOOTH:
                device = ACER_WMID3_GDS_BLUETOOTH;
                break;
        case ACER_CAP_THREEG:
                device = ACER_WMID3_GDS_THREEG;
                break;
        default:
                return AE_ERROR;
        }
        return wmid3_set_device_status(value, device);
}

static void __init type_aa_dmi_decode(const struct dmi_header *header, void *d)
{
        struct hotkey_function_type_aa *type_aa;

        /* We are looking for OEM-specific Type AAh */
        if (header->type != 0xAA)
                return;

        has_type_aa = true;
        type_aa = (struct hotkey_function_type_aa *) header;

        pr_info("Function bitmap for Communication Button: 0x%x\n",
                type_aa->commun_func_bitmap);
        commun_func_bitmap = type_aa->commun_func_bitmap;

        if (type_aa->commun_func_bitmap & ACER_WMID3_GDS_WIRELESS)
                interface->capability |= ACER_CAP_WIRELESS;
        if (type_aa->commun_func_bitmap & ACER_WMID3_GDS_THREEG)
                interface->capability |= ACER_CAP_THREEG;
        if (type_aa->commun_func_bitmap & ACER_WMID3_GDS_BLUETOOTH)
                interface->capability |= ACER_CAP_BLUETOOTH;
        if (type_aa->commun_func_bitmap & ACER_WMID3_GDS_RFBTN) {
                interface->capability |= ACER_CAP_RFBTN;
                commun_func_bitmap &= ~ACER_WMID3_GDS_RFBTN;
        }

        commun_fn_key_number = type_aa->commun_fn_key_number;
}

static acpi_status __init WMID_set_capabilities(void)
{
        struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
        union acpi_object *obj;
        acpi_status status;
        u32 devices;

        status = wmi_query_block(WMID_GUID2, 0, &out);
        if (ACPI_FAILURE(status))
                return status;

        obj = (union acpi_object *) out.pointer;
        if (obj) {
                if (obj->type == ACPI_TYPE_BUFFER &&
                        (obj->buffer.length == sizeof(u32) ||
                        obj->buffer.length == sizeof(u64))) {
                        devices = *((u32 *) obj->buffer.pointer);
                } else if (obj->type == ACPI_TYPE_INTEGER) {
                        devices = (u32) obj->integer.value;
                } else {
                        kfree(out.pointer);
                        return AE_ERROR;
                }
        } else {
                kfree(out.pointer);
                return AE_ERROR;
        }

        pr_info("Function bitmap for Communication Device: 0x%x\n", devices);
        if (devices & 0x07)
                interface->capability |= ACER_CAP_WIRELESS;
        if (devices & 0x40)
                interface->capability |= ACER_CAP_THREEG;
        if (devices & 0x10)
                interface->capability |= ACER_CAP_BLUETOOTH;

        if (!(devices & 0x20))
                max_brightness = 0x9;

        kfree(out.pointer);
        return status;
}

static struct wmi_interface wmid_interface = {
        .type = ACER_WMID,
};

static struct wmi_interface wmid_v2_interface = {
        .type = ACER_WMID_v2,
};

/*
 * Generic Device (interface-independent)
 */

static acpi_status get_u32(u32 *value, u32 cap)
{
        acpi_status status = AE_ERROR;

        switch (interface->type) {
        case ACER_AMW0:
                status = AMW0_get_u32(value, cap);
                break;
        case ACER_AMW0_V2:
                if (cap == ACER_CAP_MAILLED) {
                        status = AMW0_get_u32(value, cap);
                        break;
                }
                fallthrough;
        case ACER_WMID:
                status = WMID_get_u32(value, cap);
                break;
        case ACER_WMID_v2:
                if (cap & (ACER_CAP_WIRELESS |
                           ACER_CAP_BLUETOOTH |
                           ACER_CAP_THREEG))
                        status = wmid_v2_get_u32(value, cap);
                else if (wmi_has_guid(WMID_GUID2))
                        status = WMID_get_u32(value, cap);
                break;
        }

        return status;
}

static acpi_status set_u32(u32 value, u32 cap)
{
        acpi_status status;

        if (interface->capability & cap) {
                switch (interface->type) {
                case ACER_AMW0:
                        return AMW0_set_u32(value, cap);
                case ACER_AMW0_V2:
                        if (cap == ACER_CAP_MAILLED)
                                return AMW0_set_u32(value, cap);

                        /*
                         * On some models, some WMID methods don't toggle
                         * properly. For those cases, we want to run the AMW0
                         * method afterwards to be certain we've really toggled
                         * the device state.
                         */
                        if (cap == ACER_CAP_WIRELESS ||
                                cap == ACER_CAP_BLUETOOTH) {
                                status = WMID_set_u32(value, cap);
                                if (ACPI_FAILURE(status))
                                        return status;

                                return AMW0_set_u32(value, cap);
                        }
                        fallthrough;
                case ACER_WMID:
                        return WMID_set_u32(value, cap);
                case ACER_WMID_v2:
                        if (cap & (ACER_CAP_WIRELESS |
                                   ACER_CAP_BLUETOOTH |
                                   ACER_CAP_THREEG))
                                return wmid_v2_set_u32(value, cap);
                        else if (wmi_has_guid(WMID_GUID2))
                                return WMID_set_u32(value, cap);
                        fallthrough;
                default:
                        return AE_BAD_PARAMETER;
                }
        }
        return AE_BAD_PARAMETER;
}

static void __init acer_commandline_init(void)
{
        /*
         * These will all fail silently if the value given is invalid, or the
         * capability isn't available on the given interface
         */
        if (mailled >= 0)
                set_u32(mailled, ACER_CAP_MAILLED);
        if (!has_type_aa && threeg >= 0)
                set_u32(threeg, ACER_CAP_THREEG);
        if (brightness >= 0)
                set_u32(brightness, ACER_CAP_BRIGHTNESS);
}

/*
 * LED device (Mail LED only, no other LEDs known yet)
 */
static void mail_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
        set_u32(value, ACER_CAP_MAILLED);
}

static struct led_classdev mail_led = {
        .name = "acer-wmi::mail",
        .brightness_set = mail_led_set,
};

static int acer_led_init(struct device *dev)
{
        return led_classdev_register(dev, &mail_led);
}

static void acer_led_exit(void)
{
        set_u32(LED_OFF, ACER_CAP_MAILLED);
        led_classdev_unregister(&mail_led);
}

/*
 * Backlight device
 */
static struct backlight_device *acer_backlight_device;

static int read_brightness(struct backlight_device *bd)
{
        u32 value;
        get_u32(&value, ACER_CAP_BRIGHTNESS);
        return value;
}

static int update_bl_status(struct backlight_device *bd)
{
        int intensity = bd->props.brightness;

        if (bd->props.power != FB_BLANK_UNBLANK)
                intensity = 0;
        if (bd->props.fb_blank != FB_BLANK_UNBLANK)
                intensity = 0;

        set_u32(intensity, ACER_CAP_BRIGHTNESS);

        return 0;
}

static const struct backlight_ops acer_bl_ops = {
        .get_brightness = read_brightness,
        .update_status = update_bl_status,
};

static int acer_backlight_init(struct device *dev)
{
        struct backlight_properties props;
        struct backlight_device *bd;

        memset(&props, 0, sizeof(struct backlight_properties));
        props.type = BACKLIGHT_PLATFORM;
        props.max_brightness = max_brightness;
        bd = backlight_device_register("acer-wmi", dev, NULL, &acer_bl_ops,
                                       &props);
        if (IS_ERR(bd)) {
                pr_err("Could not register Acer backlight device\n");
                acer_backlight_device = NULL;
                return PTR_ERR(bd);
        }

        acer_backlight_device = bd;

        bd->props.power = FB_BLANK_UNBLANK;
        bd->props.brightness = read_brightness(bd);
        backlight_update_status(bd);
        return 0;
}

static void acer_backlight_exit(void)
{
        backlight_device_unregister(acer_backlight_device);
}

/*
 * Accelerometer device
 */
static acpi_handle gsensor_handle;

static int acer_gsensor_init(void)
{
        acpi_status status;
        struct acpi_buffer output;
        union acpi_object out_obj;

        output.length = sizeof(out_obj);
        output.pointer = &out_obj;
        status = acpi_evaluate_object(gsensor_handle, "_INI", NULL, &output);
        if (ACPI_FAILURE(status))
                return -1;

        return 0;
}

static int acer_gsensor_open(struct input_dev *input)
{
        return acer_gsensor_init();
}

static int acer_gsensor_event(void)
{
        acpi_status status;
        struct acpi_buffer output;
        union acpi_object out_obj[5];

        if (!has_cap(ACER_CAP_ACCEL))
                return -1;

        output.length = sizeof(out_obj);
        output.pointer = out_obj;

        status = acpi_evaluate_object(gsensor_handle, "RDVL", NULL, &output);
        if (ACPI_FAILURE(status))
                return -1;

        if (out_obj->package.count != 4)
                return -1;

        input_report_abs(acer_wmi_accel_dev, ABS_X,
                (s16)out_obj->package.elements[0].integer.value);
        input_report_abs(acer_wmi_accel_dev, ABS_Y,
                (s16)out_obj->package.elements[1].integer.value);
        input_report_abs(acer_wmi_accel_dev, ABS_Z,
                (s16)out_obj->package.elements[2].integer.value);
        input_sync(acer_wmi_accel_dev);
        return 0;
}

/*
 * Rfkill devices
 */
static void acer_rfkill_update(struct work_struct *ignored);
static DECLARE_DELAYED_WORK(acer_rfkill_work, acer_rfkill_update);
static void acer_rfkill_update(struct work_struct *ignored)
{
        u32 state;
        acpi_status status;

        if (has_cap(ACER_CAP_WIRELESS)) {
                status = get_u32(&state, ACER_CAP_WIRELESS);
                if (ACPI_SUCCESS(status)) {
                        if (quirks->wireless == 3)
                                rfkill_set_hw_state(wireless_rfkill, !state);
                        else
                                rfkill_set_sw_state(wireless_rfkill, !state);
                }
        }

        if (has_cap(ACER_CAP_BLUETOOTH)) {
                status = get_u32(&state, ACER_CAP_BLUETOOTH);
                if (ACPI_SUCCESS(status))
                        rfkill_set_sw_state(bluetooth_rfkill, !state);
        }

        if (has_cap(ACER_CAP_THREEG) && wmi_has_guid(WMID_GUID3)) {
                status = get_u32(&state, ACER_WMID3_GDS_THREEG);
                if (ACPI_SUCCESS(status))
                        rfkill_set_sw_state(threeg_rfkill, !state);
        }

        schedule_delayed_work(&acer_rfkill_work, round_jiffies_relative(HZ));
}

static int acer_rfkill_set(void *data, bool blocked)
{
        acpi_status status;
        u32 cap = (unsigned long)data;

        if (rfkill_inited) {
                status = set_u32(!blocked, cap);
                if (ACPI_FAILURE(status))
                        return -ENODEV;
        }

        return 0;
}

static const struct rfkill_ops acer_rfkill_ops = {
        .set_block = acer_rfkill_set,
};

static struct rfkill *acer_rfkill_register(struct device *dev,
                                           enum rfkill_type type,
                                           char *name, u32 cap)
{
        int err;
        struct rfkill *rfkill_dev;
        u32 state;
        acpi_status status;

        rfkill_dev = rfkill_alloc(name, dev, type,
                                  &acer_rfkill_ops,
                                  (void *)(unsigned long)cap);
        if (!rfkill_dev)
                return ERR_PTR(-ENOMEM);

        status = get_u32(&state, cap);

        err = rfkill_register(rfkill_dev);
        if (err) {
                rfkill_destroy(rfkill_dev);
                return ERR_PTR(err);
        }

        if (ACPI_SUCCESS(status))
                rfkill_set_sw_state(rfkill_dev, !state);

        return rfkill_dev;
}

static int acer_rfkill_init(struct device *dev)
{
        int err;

        if (has_cap(ACER_CAP_WIRELESS)) {
                wireless_rfkill = acer_rfkill_register(dev, RFKILL_TYPE_WLAN,
                        "acer-wireless", ACER_CAP_WIRELESS);
                if (IS_ERR(wireless_rfkill)) {
                        err = PTR_ERR(wireless_rfkill);
                        goto error_wireless;
                }
        }

        if (has_cap(ACER_CAP_BLUETOOTH)) {
                bluetooth_rfkill = acer_rfkill_register(dev,
                        RFKILL_TYPE_BLUETOOTH, "acer-bluetooth",
                        ACER_CAP_BLUETOOTH);
                if (IS_ERR(bluetooth_rfkill)) {
                        err = PTR_ERR(bluetooth_rfkill);
                        goto error_bluetooth;
                }
        }

        if (has_cap(ACER_CAP_THREEG)) {
                threeg_rfkill = acer_rfkill_register(dev,
                        RFKILL_TYPE_WWAN, "acer-threeg",
                        ACER_CAP_THREEG);
                if (IS_ERR(threeg_rfkill)) {
                        err = PTR_ERR(threeg_rfkill);
                        goto error_threeg;
                }
        }

        rfkill_inited = true;

        if ((ec_raw_mode || !wmi_has_guid(ACERWMID_EVENT_GUID)) &&
            has_cap(ACER_CAP_WIRELESS | ACER_CAP_BLUETOOTH | ACER_CAP_THREEG))
                schedule_delayed_work(&acer_rfkill_work,
                        round_jiffies_relative(HZ));

        return 0;

error_threeg:
        if (has_cap(ACER_CAP_BLUETOOTH)) {
                rfkill_unregister(bluetooth_rfkill);
                rfkill_destroy(bluetooth_rfkill);
        }
error_bluetooth:
        if (has_cap(ACER_CAP_WIRELESS)) {
                rfkill_unregister(wireless_rfkill);
                rfkill_destroy(wireless_rfkill);
        }
error_wireless:
        return err;
}

static void acer_rfkill_exit(void)
{
        if ((ec_raw_mode || !wmi_has_guid(ACERWMID_EVENT_GUID)) &&
            has_cap(ACER_CAP_WIRELESS | ACER_CAP_BLUETOOTH | ACER_CAP_THREEG))
                cancel_delayed_work_sync(&acer_rfkill_work);

        if (has_cap(ACER_CAP_WIRELESS)) {
                rfkill_unregister(wireless_rfkill);
                rfkill_destroy(wireless_rfkill);
        }

        if (has_cap(ACER_CAP_BLUETOOTH)) {
                rfkill_unregister(bluetooth_rfkill);
                rfkill_destroy(bluetooth_rfkill);
        }

        if (has_cap(ACER_CAP_THREEG)) {
                rfkill_unregister(threeg_rfkill);
                rfkill_destroy(threeg_rfkill);
        }
        return;
}

static void acer_wmi_notify(u32 value, void *context)
{
        struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
        union acpi_object *obj;
        struct event_return_value return_value;
        acpi_status status;
        u16 device_state;
        const struct key_entry *key;
        u32 scancode;

        status = wmi_get_event_data(value, &response);
        if (status != AE_OK) {
                pr_warn("bad event status 0x%x\n", status);
                return;
        }

        obj = (union acpi_object *)response.pointer;

        if (!obj)
                return;
        if (obj->type != ACPI_TYPE_BUFFER) {
                pr_warn("Unknown response received %d\n", obj->type);
                kfree(obj);
                return;
        }
        if (obj->buffer.length != 8) {
                pr_warn("Unknown buffer length %d\n", obj->buffer.length);
                kfree(obj);
                return;
        }

        return_value = *((struct event_return_value *)obj->buffer.pointer);
        kfree(obj);

        switch (return_value.function) {
        case WMID_HOTKEY_EVENT:
                device_state = return_value.device_state;
                pr_debug("device state: 0x%x\n", device_state);

                key = sparse_keymap_entry_from_scancode(acer_wmi_input_dev,
                                                        return_value.key_num);
                if (!key) {
                        pr_warn("Unknown key number - 0x%x\n",
                                return_value.key_num);
                } else {
                        scancode = return_value.key_num;
                        switch (key->keycode) {
                        case KEY_WLAN:
                        case KEY_BLUETOOTH:
                                if (has_cap(ACER_CAP_WIRELESS))
                                        rfkill_set_sw_state(wireless_rfkill,
                                                !(device_state & ACER_WMID3_GDS_WIRELESS));
                                if (has_cap(ACER_CAP_THREEG))
                                        rfkill_set_sw_state(threeg_rfkill,
                                                !(device_state & ACER_WMID3_GDS_THREEG));
                                if (has_cap(ACER_CAP_BLUETOOTH))
                                        rfkill_set_sw_state(bluetooth_rfkill,
                                                !(device_state & ACER_WMID3_GDS_BLUETOOTH));
                                break;
                        case KEY_TOUCHPAD_TOGGLE:
                                scancode = (device_state & ACER_WMID3_GDS_TOUCHPAD) ?
                                                KEY_TOUCHPAD_ON : KEY_TOUCHPAD_OFF;
                        }
                        sparse_keymap_report_event(acer_wmi_input_dev, scancode, 1, true);
                }
                break;
        case WMID_ACCEL_EVENT:
                acer_gsensor_event();
                break;
        default:
                pr_warn("Unknown function number - %d - %d\n",
                        return_value.function, return_value.key_num);
                break;
        }
}

static acpi_status __init
wmid3_set_function_mode(struct func_input_params *params,
                        struct func_return_value *return_value)
{
        acpi_status status;
        union acpi_object *obj;

        struct acpi_buffer input = { sizeof(struct func_input_params), params };
        struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };

        status = wmi_evaluate_method(WMID_GUID3, 0, 0x1, &input, &output);
        if (ACPI_FAILURE(status))
                return status;

        obj = output.pointer;

        if (!obj)
                return AE_ERROR;
        else if (obj->type != ACPI_TYPE_BUFFER) {
                kfree(obj);
                return AE_ERROR;
        }
        if (obj->buffer.length != 4) {
                pr_warn("Unknown buffer length %d\n", obj->buffer.length);
                kfree(obj);
                return AE_ERROR;
        }

        *return_value = *((struct func_return_value *)obj->buffer.pointer);
        kfree(obj);

        return status;
}

static int __init acer_wmi_enable_ec_raw(void)
{
        struct func_return_value return_value;
        acpi_status status;
        struct func_input_params params = {
                .function_num = 0x1,
                .commun_devices = 0xFFFF,
                .devices = 0xFFFF,
                .app_status = 0x00,             /* Launch Manager Deactive */
                .app_mask = 0x01,
        };

        status = wmid3_set_function_mode(&params, &return_value);

        if (return_value.error_code || return_value.ec_return_value)
                pr_warn("Enabling EC raw mode failed: 0x%x - 0x%x\n",
                        return_value.error_code,
                        return_value.ec_return_value);
        else
                pr_info("Enabled EC raw mode\n");

        return status;
}

static int __init acer_wmi_enable_lm(void)
{
        struct func_return_value return_value;
        acpi_status status;
        struct func_input_params params = {
                .function_num = 0x1,
                .commun_devices = 0xFFFF,
                .devices = 0xFFFF,
                .app_status = 0x01,            /* Launch Manager Active */
                .app_mask = 0x01,
        };

        status = wmid3_set_function_mode(&params, &return_value);

        if (return_value.error_code || return_value.ec_return_value)
                pr_warn("Enabling Launch Manager failed: 0x%x - 0x%x\n",
                        return_value.error_code,
                        return_value.ec_return_value);

        return status;
}

static int __init acer_wmi_enable_rf_button(void)
{
        struct func_return_value return_value;
        acpi_status status;
        struct func_input_params params = {
                .function_num = 0x1,
                .commun_devices = 0xFFFF,
                .devices = 0xFFFF,
                .app_status = 0x10,            /* RF Button Active */
                .app_mask = 0x10,
        };

        status = wmid3_set_function_mode(&params, &return_value);

        if (return_value.error_code || return_value.ec_return_value)
                pr_warn("Enabling RF Button failed: 0x%x - 0x%x\n",
                        return_value.error_code,
                        return_value.ec_return_value);

        return status;
}

static int __init acer_wmi_accel_setup(void)
{
        struct acpi_device *adev;
        int err;

        adev = acpi_dev_get_first_match_dev("BST0001", NULL, -1);
        if (!adev)
                return -ENODEV;

        gsensor_handle = acpi_device_handle(adev);
        acpi_dev_put(adev);

        interface->capability |= ACER_CAP_ACCEL;

        acer_wmi_accel_dev = input_allocate_device();
        if (!acer_wmi_accel_dev)
                return -ENOMEM;

        acer_wmi_accel_dev->open = acer_gsensor_open;

        acer_wmi_accel_dev->name = "Acer BMA150 accelerometer";
        acer_wmi_accel_dev->phys = "wmi/input1";
        acer_wmi_accel_dev->id.bustype = BUS_HOST;
        acer_wmi_accel_dev->evbit[0] = BIT_MASK(EV_ABS);
        input_set_abs_params(acer_wmi_accel_dev, ABS_X, -16384, 16384, 0, 0);
        input_set_abs_params(acer_wmi_accel_dev, ABS_Y, -16384, 16384, 0, 0);
        input_set_abs_params(acer_wmi_accel_dev, ABS_Z, -16384, 16384, 0, 0);

        err = input_register_device(acer_wmi_accel_dev);
        if (err)
                goto err_free_dev;

        return 0;

err_free_dev:
        input_free_device(acer_wmi_accel_dev);
        return err;
}

static void acer_wmi_accel_destroy(void)
{
        input_unregister_device(acer_wmi_accel_dev);
}

static int __init acer_wmi_input_setup(void)
{
        acpi_status status;
        int err;

        acer_wmi_input_dev = input_allocate_device();
        if (!acer_wmi_input_dev)
                return -ENOMEM;

        acer_wmi_input_dev->name = "Acer WMI hotkeys";
        acer_wmi_input_dev->phys = "wmi/input0";
        acer_wmi_input_dev->id.bustype = BUS_HOST;

        err = sparse_keymap_setup(acer_wmi_input_dev, acer_wmi_keymap, NULL);
        if (err)
                goto err_free_dev;

        status = wmi_install_notify_handler(ACERWMID_EVENT_GUID,
                                                acer_wmi_notify, NULL);
        if (ACPI_FAILURE(status)) {
                err = -EIO;
                goto err_free_dev;
        }

        err = input_register_device(acer_wmi_input_dev);
        if (err)
                goto err_uninstall_notifier;

        return 0;

err_uninstall_notifier:
        wmi_remove_notify_handler(ACERWMID_EVENT_GUID);
err_free_dev:
        input_free_device(acer_wmi_input_dev);
        return err;
}

static void acer_wmi_input_destroy(void)
{
        wmi_remove_notify_handler(ACERWMID_EVENT_GUID);
        input_unregister_device(acer_wmi_input_dev);
}

/*
 * debugfs functions
 */
static u32 get_wmid_devices(void)
{
        struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
        union acpi_object *obj;
        acpi_status status;
        u32 devices = 0;

        status = wmi_query_block(WMID_GUID2, 0, &out);
        if (ACPI_FAILURE(status))
                return 0;

        obj = (union acpi_object *) out.pointer;
        if (obj) {
                if (obj->type == ACPI_TYPE_BUFFER &&
                        (obj->buffer.length == sizeof(u32) ||
                        obj->buffer.length == sizeof(u64))) {
                        devices = *((u32 *) obj->buffer.pointer);
                } else if (obj->type == ACPI_TYPE_INTEGER) {
                        devices = (u32) obj->integer.value;
                }
        }

        kfree(out.pointer);
        return devices;
}

/*
 * Platform device
 */
static int acer_platform_probe(struct platform_device *device)
{
        int err;

        if (has_cap(ACER_CAP_MAILLED)) {
                err = acer_led_init(&device->dev);
                if (err)
                        goto error_mailled;
        }

        if (has_cap(ACER_CAP_BRIGHTNESS)) {
                err = acer_backlight_init(&device->dev);
                if (err)
                        goto error_brightness;
        }

        err = acer_rfkill_init(&device->dev);
        if (err)
                goto error_rfkill;

        return err;

error_rfkill:
        if (has_cap(ACER_CAP_BRIGHTNESS))
                acer_backlight_exit();
error_brightness:
        if (has_cap(ACER_CAP_MAILLED))
                acer_led_exit();
error_mailled:
        return err;
}

static int acer_platform_remove(struct platform_device *device)
{
        if (has_cap(ACER_CAP_MAILLED))
                acer_led_exit();
        if (has_cap(ACER_CAP_BRIGHTNESS))
                acer_backlight_exit();

        acer_rfkill_exit();
        return 0;
}

#ifdef CONFIG_PM_SLEEP
static int acer_suspend(struct device *dev)
{
        u32 value;
        struct acer_data *data = &interface->data;

        if (!data)
                return -ENOMEM;

        if (has_cap(ACER_CAP_MAILLED)) {
                get_u32(&value, ACER_CAP_MAILLED);
                set_u32(LED_OFF, ACER_CAP_MAILLED);
                data->mailled = value;
        }

        if (has_cap(ACER_CAP_BRIGHTNESS)) {
                get_u32(&value, ACER_CAP_BRIGHTNESS);
                data->brightness = value;
        }

        return 0;
}

static int acer_resume(struct device *dev)
{
        struct acer_data *data = &interface->data;

        if (!data)
                return -ENOMEM;

        if (has_cap(ACER_CAP_MAILLED))
                set_u32(data->mailled, ACER_CAP_MAILLED);

        if (has_cap(ACER_CAP_BRIGHTNESS))
                set_u32(data->brightness, ACER_CAP_BRIGHTNESS);

        if (has_cap(ACER_CAP_ACCEL))
                acer_gsensor_init();

        return 0;
}
#else
#define acer_suspend    NULL
#define acer_resume     NULL
#endif

static SIMPLE_DEV_PM_OPS(acer_pm, acer_suspend, acer_resume);

static void acer_platform_shutdown(struct platform_device *device)
{
        struct acer_data *data = &interface->data;

        if (!data)
                return;

        if (has_cap(ACER_CAP_MAILLED))
                set_u32(LED_OFF, ACER_CAP_MAILLED);
}

static struct platform_driver acer_platform_driver = {
        .driver = {
                .name = "acer-wmi",
                .pm = &acer_pm,
        },
        .probe = acer_platform_probe,
        .remove = acer_platform_remove,
        .shutdown = acer_platform_shutdown,
};

static struct platform_device *acer_platform_device;

static void remove_debugfs(void)
{
        debugfs_remove_recursive(interface->debug.root);
}

static void __init create_debugfs(void)
{
        interface->debug.root = debugfs_create_dir("acer-wmi", NULL);

        debugfs_create_u32("devices", S_IRUGO, interface->debug.root,
                           &interface->debug.wmid_devices);
}

static int __init acer_wmi_init(void)
{
        int err;

        pr_info("Acer Laptop ACPI-WMI Extras\n");

        if (dmi_check_system(acer_blacklist)) {
                pr_info("Blacklisted hardware detected - not loading\n");
                return -ENODEV;
        }

        find_quirks();

        /*
         * The AMW0_GUID1 wmi is not only found on Acer family but also other
         * machines like Lenovo, Fujitsu and Medion. In the past days,
         * acer-wmi driver handled those non-Acer machines by quirks list.
         * But actually acer-wmi driver was loaded on any machines that have
         * AMW0_GUID1. This behavior is strange because those machines should
         * be supported by appropriate wmi drivers. e.g. fujitsu-laptop,
         * ideapad-laptop. So, here checks the machine that has AMW0_GUID1
         * should be in Acer/Gateway/Packard Bell white list, or it's already
         * in the past quirk list.
         */
        if (wmi_has_guid(AMW0_GUID1) &&
            !dmi_check_system(amw0_whitelist) &&
            quirks == &quirk_unknown) {
                pr_debug("Unsupported machine has AMW0_GUID1, unable to load\n");
                return -ENODEV;
        }

        /*
         * Detect which ACPI-WMI interface we're using.
         */
        if (wmi_has_guid(AMW0_GUID1) && wmi_has_guid(WMID_GUID1))
                interface = &AMW0_V2_interface;

        if (!wmi_has_guid(AMW0_GUID1) && wmi_has_guid(WMID_GUID1))
                interface = &wmid_interface;

        if (wmi_has_guid(WMID_GUID3))
                interface = &wmid_v2_interface;

        if (interface)
                dmi_walk(type_aa_dmi_decode, NULL);

        if (wmi_has_guid(WMID_GUID2) && interface) {
                if (!has_type_aa && ACPI_FAILURE(WMID_set_capabilities())) {
                        pr_err("Unable to detect available WMID devices\n");
                        return -ENODEV;
                }
                /* WMID always provides brightness methods */
                interface->capability |= ACER_CAP_BRIGHTNESS;
        } else if (!wmi_has_guid(WMID_GUID2) && interface && !has_type_aa) {
                pr_err("No WMID device detection method found\n");
                return -ENODEV;
        }

        if (wmi_has_guid(AMW0_GUID1) && !wmi_has_guid(WMID_GUID1)) {
                interface = &AMW0_interface;

                if (ACPI_FAILURE(AMW0_set_capabilities())) {
                        pr_err("Unable to detect available AMW0 devices\n");
                        return -ENODEV;
                }
        }

        if (wmi_has_guid(AMW0_GUID1))
                AMW0_find_mailled();

        if (!interface) {
                pr_err("No or unsupported WMI interface, unable to load\n");
                return -ENODEV;
        }

        set_quirks();

        if (dmi_check_system(video_vendor_dmi_table))
                acpi_video_set_dmi_backlight_type(acpi_backlight_vendor);

        if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
                interface->capability &= ~ACER_CAP_BRIGHTNESS;

        if (wmi_has_guid(WMID_GUID3)) {
                if (ACPI_FAILURE(acer_wmi_enable_rf_button()))
                        pr_warn("Cannot enable RF Button Driver\n");

                if (ec_raw_mode) {
                        if (ACPI_FAILURE(acer_wmi_enable_ec_raw())) {
                                pr_err("Cannot enable EC raw mode\n");
                                return -ENODEV;
                        }
                } else if (ACPI_FAILURE(acer_wmi_enable_lm())) {
                        pr_err("Cannot enable Launch Manager mode\n");
                        return -ENODEV;
                }
        } else if (ec_raw_mode) {
                pr_info("No WMID EC raw mode enable method\n");
        }

        if (wmi_has_guid(ACERWMID_EVENT_GUID)) {
                err = acer_wmi_input_setup();
                if (err)
                        return err;
                err = acer_wmi_accel_setup();
                if (err && err != -ENODEV)
                        pr_warn("Cannot enable accelerometer\n");
        }

        err = platform_driver_register(&acer_platform_driver);
        if (err) {
                pr_err("Unable to register platform driver\n");
                goto error_platform_register;
        }

        acer_platform_device = platform_device_alloc("acer-wmi", -1);
        if (!acer_platform_device) {
                err = -ENOMEM;
                goto error_device_alloc;
        }

        err = platform_device_add(acer_platform_device);
        if (err)
                goto error_device_add;

        if (wmi_has_guid(WMID_GUID2)) {
                interface->debug.wmid_devices = get_wmid_devices();
                create_debugfs();
        }

        /* Override any initial settings with values from the commandline */
        acer_commandline_init();

        return 0;

error_device_add:
        platform_device_put(acer_platform_device);
error_device_alloc:
        platform_driver_unregister(&acer_platform_driver);
error_platform_register:
        if (wmi_has_guid(ACERWMID_EVENT_GUID))
                acer_wmi_input_destroy();
        if (has_cap(ACER_CAP_ACCEL))
                acer_wmi_accel_destroy();

        return err;
}

static void __exit acer_wmi_exit(void)
{
        if (wmi_has_guid(ACERWMID_EVENT_GUID))
                acer_wmi_input_destroy();

        if (has_cap(ACER_CAP_ACCEL))
                acer_wmi_accel_destroy();

        remove_debugfs();
        platform_device_unregister(acer_platform_device);
        platform_driver_unregister(&acer_platform_driver);

        pr_info("Acer Laptop WMI Extras unloaded\n");
        return;
}

module_init(acer_wmi_init);
module_exit(acer_wmi_exit);