asus-laptop.c

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/*
 *  asus-laptop.c - Asus Laptop Support
 *
 *
 *  Copyright (C) 2002-2005 Julien Lerouge, 2003-2006 Karol Kozimor
 *  Copyright (C) 2006-2007 Corentin Chary
 *  Copyright (C) 2011 Wind River Systems
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *
 *  The development page for this driver is located at
 *  http://sourceforge.net/projects/acpi4asus/
 *
 *  Credits:
 *  Pontus Fuchs   - Helper functions, cleanup
 *  Johann Wiesner - Small compile fixes
 *  John Belmonte  - ACPI code for Toshiba laptop was a good starting point.
 *  Eric Burghard  - LED display support for W1N
 *  Josh Green     - Light Sens support
 *  Thomas Tuttle  - His first patch for led support was very helpful
 *  Sam Lin        - GPS support
 */

#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/err.h>
#include <linux/proc_fs.h>
#include <linux/backlight.h>
#include <linux/fb.h>
#include <linux/leds.h>
#include <linux/platform_device.h>
#include <linux/uaccess.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/input-polldev.h>
#include <linux/rfkill.h>
#include <linux/slab.h>
#include <linux/dmi.h>
#include <acpi/acpi_drivers.h>
#include <acpi/acpi_bus.h>

#define ASUS_LAPTOP_VERSION "0.42"

#define ASUS_LAPTOP_NAME    "Asus Laptop Support"
#define ASUS_LAPTOP_CLASS   "hotkey"
#define ASUS_LAPTOP_DEVICE_NAME "Hotkey"
#define ASUS_LAPTOP_FILE    KBUILD_MODNAME
#define ASUS_LAPTOP_PREFIX  "\\_SB.ATKD."

MODULE_AUTHOR("Julien Lerouge, Karol Kozimor, Corentin Chary");
MODULE_DESCRIPTION(ASUS_LAPTOP_NAME);
MODULE_LICENSE("GPL");

/*
 * WAPF defines the behavior of the Fn+Fx wlan key
 * The significance of values is yet to be found, but
 * most of the time:
 * Bit | Bluetooth | WLAN
 *  0  | Hardware  | Hardware
 *  1  | Hardware  | Software
 *  4  | Software  | Software
 */
static uint wapf = 1;
module_param(wapf, uint, 0444);
MODULE_PARM_DESC(wapf, "WAPF value");

static char *wled_type = "unknown";
static char *bled_type = "unknown";

module_param(wled_type, charp, 0444);
MODULE_PARM_DESC(wled_type, "Set the wled type on boot "
         "(unknown, led or rfkill). "
         "default is unknown");

module_param(bled_type, charp, 0444);
MODULE_PARM_DESC(bled_type, "Set the bled type on boot "
         "(unknown, led or rfkill). "
         "default is unknown");

static int wlan_status = 1;
static int bluetooth_status = 1;
static int wimax_status = -1;
static int wwan_status = -1;
static int als_status;

module_param(wlan_status, int, 0444);
MODULE_PARM_DESC(wlan_status, "Set the wireless status on boot "
         "(0 = disabled, 1 = enabled, -1 = don't do anything). "
         "default is -1");

module_param(bluetooth_status, int, 0444);
MODULE_PARM_DESC(bluetooth_status, "Set the wireless status on boot "
         "(0 = disabled, 1 = enabled, -1 = don't do anything). "
         "default is -1");

module_param(wimax_status, int, 0444);
MODULE_PARM_DESC(wimax_status, "Set the wireless status on boot "
         "(0 = disabled, 1 = enabled, -1 = don't do anything). "
         "default is -1");

module_param(wwan_status, int, 0444);
MODULE_PARM_DESC(wwan_status, "Set the wireless status on boot "
         "(0 = disabled, 1 = enabled, -1 = don't do anything). "
         "default is -1");

module_param(als_status, int, 0444);
MODULE_PARM_DESC(als_status, "Set the ALS status on boot "
         "(0 = disabled, 1 = enabled). "
         "default is 0");

/*
 * Some events we use, same for all Asus
 */
#define ATKD_BR_UP  0x10    /* (event & ~ATKD_BR_UP) = brightness level */
#define ATKD_BR_DOWN    0x20    /* (event & ~ATKD_BR_DOWN) = britghness level */
#define ATKD_BR_MIN ATKD_BR_UP
#define ATKD_BR_MAX (ATKD_BR_DOWN | 0xF)    /* 0x2f */
#define ATKD_LCD_ON 0x33
#define ATKD_LCD_OFF    0x34

/*
 * Known bits returned by \_SB.ATKD.HWRS
 */
#define WL_HWRS     0x80
#define BT_HWRS     0x100

/*
 * Flags for hotk status
 * WL_ON and BT_ON are also used for wireless_status()
 */
#define WL_RSTS     0x01    /* internal Wifi */
#define BT_RSTS     0x02    /* internal Bluetooth */
#define WM_RSTS     0x08    /* internal wimax */
#define WW_RSTS     0x20    /* internal wwan */

/* WLED and BLED type */
#define TYPE_UNKNOWN    0
#define TYPE_LED    1
#define TYPE_RFKILL 2

/* LED */
#define METHOD_MLED     "MLED"
#define METHOD_TLED     "TLED"
#define METHOD_RLED     "RLED"  /* W1JC */
#define METHOD_PLED     "PLED"  /* A7J */
#define METHOD_GLED     "GLED"  /* G1, G2 (probably) */

/* LEDD */
#define METHOD_LEDD     "SLCM"

/*
 * Bluetooth and WLAN
 * WLED and BLED are not handled like other XLED, because in some dsdt
 * they also control the WLAN/Bluetooth device.
 */
#define METHOD_WLAN     "WLED"
#define METHOD_BLUETOOTH    "BLED"

/* WWAN and WIMAX */
#define METHOD_WWAN     "GSMC"
#define METHOD_WIMAX        "WMXC"

#define METHOD_WL_STATUS    "RSTS"

/* Brightness */
#define METHOD_BRIGHTNESS_SET   "SPLV"
#define METHOD_BRIGHTNESS_GET   "GPLV"

/* Display */
#define METHOD_SWITCH_DISPLAY   "SDSP"

#define METHOD_ALS_CONTROL  "ALSC" /* Z71A Z71V */
#define METHOD_ALS_LEVEL    "ALSL" /* Z71A Z71V */

/* GPS */
/* R2H use different handle for GPS on/off */
#define METHOD_GPS_ON       "SDON"
#define METHOD_GPS_OFF      "SDOF"
#define METHOD_GPS_STATUS   "GPST"

/* Keyboard light */
#define METHOD_KBD_LIGHT_SET    "SLKB"
#define METHOD_KBD_LIGHT_GET    "GLKB"

/* For Pegatron Lucid tablet */
#define DEVICE_NAME_PEGA    "Lucid"

#define METHOD_PEGA_ENABLE  "ENPR"
#define METHOD_PEGA_DISABLE "DAPR"
#define PEGA_WLAN   0x00
#define PEGA_BLUETOOTH  0x01
#define PEGA_WWAN   0x02
#define PEGA_ALS    0x04
#define PEGA_ALS_POWER  0x05

#define METHOD_PEGA_READ    "RDLN"
#define PEGA_READ_ALS_H 0x02
#define PEGA_READ_ALS_L 0x03

#define PEGA_ACCEL_NAME "pega_accel"
#define PEGA_ACCEL_DESC "Pegatron Lucid Tablet Accelerometer"
#define METHOD_XLRX "XLRX"
#define METHOD_XLRY "XLRY"
#define METHOD_XLRZ "XLRZ"
#define PEGA_ACC_CLAMP 512 /* 1G accel is reported as ~256, so clamp to 2G */
#define PEGA_ACC_RETRIES 3

/*
 * Define a specific led structure to keep the main structure clean
 */
struct asus_led {
    int wk;
    struct work_struct work;
    struct led_classdev led;
    struct asus_laptop *asus;
    const char *method;
};

/*
 * Same thing for rfkill
 */
struct asus_rfkill {
    /* type of control. Maps to PEGA_* values or *_RSTS  */
    int control_id;
    struct rfkill *rfkill;
    struct asus_laptop *asus;
};

/*
 * This is the main structure, we can use it to store anything interesting
 * about the hotk device
 */
struct asus_laptop {
    char *name;     /* laptop name */

    struct acpi_table_header *dsdt_info;
    struct platform_device *platform_device;
    struct acpi_device *device;     /* the device we are in */
    struct backlight_device *backlight_device;

    struct input_dev *inputdev;
    struct key_entry *keymap;
    struct input_polled_dev *pega_accel_poll;

    struct asus_led wled;
    struct asus_led bled;
    struct asus_led mled;
    struct asus_led tled;
    struct asus_led rled;
    struct asus_led pled;
    struct asus_led gled;
    struct asus_led kled;
    struct workqueue_struct *led_workqueue;

    int wled_type;
    int bled_type;
    int wireless_status;
    bool have_rsts;
    bool is_pega_lucid;
    bool pega_acc_live;
    int pega_acc_x;
    int pega_acc_y;
    int pega_acc_z;

    struct asus_rfkill wlan;
    struct asus_rfkill bluetooth;
    struct asus_rfkill wwan;
    struct asus_rfkill wimax;
    struct asus_rfkill gps;

    acpi_handle handle; /* the handle of the hotk device */
    u32 ledd_status;    /* status of the LED display */
    u8 light_level;     /* light sensor level */
    u8 light_switch;    /* light sensor switch value */
    u16 event_count[128];   /* count for each event TODO make this better */
};

static const struct key_entry asus_keymap[] = {
    /* Lenovo SL Specific keycodes */
    {KE_KEY, 0x02, { KEY_SCREENLOCK } },
    {KE_KEY, 0x05, { KEY_WLAN } },
    {KE_KEY, 0x08, { KEY_F13 } },
    {KE_KEY, 0x09, { KEY_PROG2 } }, /* Dock */
    {KE_KEY, 0x17, { KEY_ZOOM } },
    {KE_KEY, 0x1f, { KEY_BATTERY } },
    /* End of Lenovo SL Specific keycodes */
    {KE_KEY, 0x30, { KEY_VOLUMEUP } },
    {KE_KEY, 0x31, { KEY_VOLUMEDOWN } },
    {KE_KEY, 0x32, { KEY_MUTE } },
    {KE_KEY, 0x33, { KEY_SWITCHVIDEOMODE } },
    {KE_KEY, 0x34, { KEY_SWITCHVIDEOMODE } },
    {KE_KEY, 0x40, { KEY_PREVIOUSSONG } },
    {KE_KEY, 0x41, { KEY_NEXTSONG } },
    {KE_KEY, 0x43, { KEY_STOPCD } },
    {KE_KEY, 0x45, { KEY_PLAYPAUSE } },
    {KE_KEY, 0x4c, { KEY_MEDIA } },
    {KE_KEY, 0x50, { KEY_EMAIL } },
    {KE_KEY, 0x51, { KEY_WWW } },
    {KE_KEY, 0x55, { KEY_CALC } },
    {KE_KEY, 0x5C, { KEY_SCREENLOCK } },  /* Screenlock */
    {KE_KEY, 0x5D, { KEY_WLAN } },
    {KE_KEY, 0x5E, { KEY_WLAN } },
    {KE_KEY, 0x5F, { KEY_WLAN } },
    {KE_KEY, 0x60, { KEY_SWITCHVIDEOMODE } },
    {KE_KEY, 0x61, { KEY_SWITCHVIDEOMODE } },
    {KE_KEY, 0x62, { KEY_SWITCHVIDEOMODE } },
    {KE_KEY, 0x63, { KEY_SWITCHVIDEOMODE } },
    {KE_KEY, 0x6B, { KEY_F13 } }, /* Lock Touchpad */
    {KE_KEY, 0x6C, { KEY_SLEEP } }, /* Suspend */
    {KE_KEY, 0x6D, { KEY_SLEEP } }, /* Hibernate */
    {KE_KEY, 0x7E, { KEY_BLUETOOTH } },
    {KE_KEY, 0x7D, { KEY_BLUETOOTH } },
    {KE_KEY, 0x82, { KEY_CAMERA } },
    {KE_KEY, 0x88, { KEY_WLAN  } },
    {KE_KEY, 0x8A, { KEY_PROG1 } },
    {KE_KEY, 0x95, { KEY_MEDIA } },
    {KE_KEY, 0x99, { KEY_PHONE } },
    {KE_KEY, 0xc4, { KEY_KBDILLUMUP } },
    {KE_KEY, 0xc5, { KEY_KBDILLUMDOWN } },
    {KE_KEY, 0xb5, { KEY_CALC } },
    {KE_END, 0},
};


/*
 * This function evaluates an ACPI method, given an int as parameter, the
 * method is searched within the scope of the handle, can be NULL. The output
 * of the method is written is output, which can also be NULL
 *
 * returns 0 if write is successful, -1 else.
 */
static int write_acpi_int_ret(acpi_handle handle, const char *method, int val,
                  struct acpi_buffer *output)
{
    struct acpi_object_list params; /* list of input parameters (an int) */
    union acpi_object in_obj;   /* the only param we use */
    acpi_status status;

    if (!handle)
        return -1;

    params.count = 1;
    params.pointer = &in_obj;
    in_obj.type = ACPI_TYPE_INTEGER;
    in_obj.integer.value = val;

    status = acpi_evaluate_object(handle, (char *)method, &params, output);
    if (status == AE_OK)
        return 0;
    else
        return -1;
}

static int write_acpi_int(acpi_handle handle, const char *method, int val)
{
    return write_acpi_int_ret(handle, method, val, NULL);
}

static int acpi_check_handle(acpi_handle handle, const char *method,
                 acpi_handle *ret)
{
    acpi_status status;

    if (method == NULL)
        return -ENODEV;

    if (ret)
        status = acpi_get_handle(handle, (char *)method,
                     ret);
    else {
        acpi_handle dummy;

        status = acpi_get_handle(handle, (char *)method,
                     &dummy);
    }

    if (status != AE_OK) {
        if (ret)
            pr_warn("Error finding %s\n", method);
        return -ENODEV;
    }
    return 0;
}

static bool asus_check_pega_lucid(struct asus_laptop *asus)
{
    return !strcmp(asus->name, DEVICE_NAME_PEGA) &&
       !acpi_check_handle(asus->handle, METHOD_PEGA_ENABLE, NULL) &&
       !acpi_check_handle(asus->handle, METHOD_PEGA_DISABLE, NULL) &&
       !acpi_check_handle(asus->handle, METHOD_PEGA_READ, NULL);
}

static int asus_pega_lucid_set(struct asus_laptop *asus, int unit, bool enable)
{
    char *method = enable ? METHOD_PEGA_ENABLE : METHOD_PEGA_DISABLE;
    return write_acpi_int(asus->handle, method, unit);
}

static int pega_acc_axis(struct asus_laptop *asus, int curr, char *method)
{
    int i, delta;
    unsigned long long val;
    for (i = 0; i < PEGA_ACC_RETRIES; i++) {
        acpi_evaluate_integer(asus->handle, method, NULL, &val);

        /* The output is noisy.  From reading the ASL
         * dissassembly, timeout errors are returned with 1's
         * in the high word, and the lack of locking around
         * thei hi/lo byte reads means that a transition
         * between (for example) -1 and 0 could be read as
         * 0xff00 or 0x00ff. */
        delta = abs(curr - (short)val);
        if (delta < 128 && !(val & ~0xffff))
            break;
    }
    return clamp_val((short)val, -PEGA_ACC_CLAMP, PEGA_ACC_CLAMP);
}

static void pega_accel_poll(struct input_polled_dev *ipd)
{
    struct device *parent = ipd->input->dev.parent;
    struct asus_laptop *asus = dev_get_drvdata(parent);

    /* In some cases, the very first call to poll causes a
     * recursive fault under the polldev worker.  This is
     * apparently related to very early userspace access to the
     * device, and perhaps a firmware bug. Fake the first report. */
    if (!asus->pega_acc_live) {
        asus->pega_acc_live = true;
        input_report_abs(ipd->input, ABS_X, 0);
        input_report_abs(ipd->input, ABS_Y, 0);
        input_report_abs(ipd->input, ABS_Z, 0);
        input_sync(ipd->input);
        return;
    }

    asus->pega_acc_x = pega_acc_axis(asus, asus->pega_acc_x, METHOD_XLRX);
    asus->pega_acc_y = pega_acc_axis(asus, asus->pega_acc_y, METHOD_XLRY);
    asus->pega_acc_z = pega_acc_axis(asus, asus->pega_acc_z, METHOD_XLRZ);

    /* Note transform, convert to "right/up/out" in the native
     * landscape orientation (i.e. the vector is the direction of
     * "real up" in the device's cartiesian coordinates). */
    input_report_abs(ipd->input, ABS_X, -asus->pega_acc_x);
    input_report_abs(ipd->input, ABS_Y, -asus->pega_acc_y);
    input_report_abs(ipd->input, ABS_Z,  asus->pega_acc_z);
    input_sync(ipd->input);
}

static void pega_accel_exit(struct asus_laptop *asus)
{
    if (asus->pega_accel_poll) {
        input_unregister_polled_device(asus->pega_accel_poll);
        input_free_polled_device(asus->pega_accel_poll);
    }
    asus->pega_accel_poll = NULL;
}

static int pega_accel_init(struct asus_laptop *asus)
{
    int err;
    struct input_polled_dev *ipd;

    if (!asus->is_pega_lucid)
        return -ENODEV;

    if (acpi_check_handle(asus->handle, METHOD_XLRX, NULL) ||
        acpi_check_handle(asus->handle, METHOD_XLRY, NULL) ||
        acpi_check_handle(asus->handle, METHOD_XLRZ, NULL))
        return -ENODEV;

    ipd = input_allocate_polled_device();
    if (!ipd)
        return -ENOMEM;

    ipd->poll = pega_accel_poll;
    ipd->poll_interval = 125;
    ipd->poll_interval_min = 50;
    ipd->poll_interval_max = 2000;

    ipd->input->name = PEGA_ACCEL_DESC;
    ipd->input->phys = PEGA_ACCEL_NAME "/input0";
    ipd->input->dev.parent = &asus->platform_device->dev;
    ipd->input->id.bustype = BUS_HOST;

    set_bit(EV_ABS, ipd->input->evbit);
    input_set_abs_params(ipd->input, ABS_X,
                 -PEGA_ACC_CLAMP, PEGA_ACC_CLAMP, 0, 0);
    input_set_abs_params(ipd->input, ABS_Y,
                 -PEGA_ACC_CLAMP, PEGA_ACC_CLAMP, 0, 0);
    input_set_abs_params(ipd->input, ABS_Z,
                 -PEGA_ACC_CLAMP, PEGA_ACC_CLAMP, 0, 0);

    err = input_register_polled_device(ipd);
    if (err)
        goto exit;

    asus->pega_accel_poll = ipd;
    return 0;

exit:
    input_free_polled_device(ipd);
    return err;
}

/* Generic LED function */
static int asus_led_set(struct asus_laptop *asus, const char *method,
             int value)
{
    if (!strcmp(method, METHOD_MLED))
        value = !value;
    else if (!strcmp(method, METHOD_GLED))
        value = !value + 1;
    else
        value = !!value;

    return write_acpi_int(asus->handle, method, value);
}

/*
 * LEDs
 */
/* /sys/class/led handlers */
static void asus_led_cdev_set(struct led_classdev *led_cdev,
             enum led_brightness value)
{
    struct asus_led *led = container_of(led_cdev, struct asus_led, led);
    struct asus_laptop *asus = led->asus;

    led->wk = !!value;
    queue_work(asus->led_workqueue, &led->work);
}

static void asus_led_cdev_update(struct work_struct *work)
{
    struct asus_led *led = container_of(work, struct asus_led, work);
    struct asus_laptop *asus = led->asus;

    asus_led_set(asus, led->method, led->wk);
}

static enum led_brightness asus_led_cdev_get(struct led_classdev *led_cdev)
{
    return led_cdev->brightness;
}

/*
 * Keyboard backlight (also a LED)
 */
static int asus_kled_lvl(struct asus_laptop *asus)
{
    unsigned long long kblv;
    struct acpi_object_list params;
    union acpi_object in_obj;
    acpi_status rv;

    params.count = 1;
    params.pointer = &in_obj;
    in_obj.type = ACPI_TYPE_INTEGER;
    in_obj.integer.value = 2;

    rv = acpi_evaluate_integer(asus->handle, METHOD_KBD_LIGHT_GET,
                   &params, &kblv);
    if (ACPI_FAILURE(rv)) {
        pr_warn("Error reading kled level\n");
        return -ENODEV;
    }
    return kblv;
}

static int asus_kled_set(struct asus_laptop *asus, int kblv)
{
    if (kblv > 0)
        kblv = (1 << 7) | (kblv & 0x7F);
    else
        kblv = 0;

    if (write_acpi_int(asus->handle, METHOD_KBD_LIGHT_SET, kblv)) {
        pr_warn("Keyboard LED display write failed\n");
        return -EINVAL;
    }
    return 0;
}

static void asus_kled_cdev_set(struct led_classdev *led_cdev,
                  enum led_brightness value)
{
    struct asus_led *led = container_of(led_cdev, struct asus_led, led);
    struct asus_laptop *asus = led->asus;

    led->wk = value;
    queue_work(asus->led_workqueue, &led->work);
}

static void asus_kled_cdev_update(struct work_struct *work)
{
    struct asus_led *led = container_of(work, struct asus_led, work);
    struct asus_laptop *asus = led->asus;

    asus_kled_set(asus, led->wk);
}

static enum led_brightness asus_kled_cdev_get(struct led_classdev *led_cdev)
{
    struct asus_led *led = container_of(led_cdev, struct asus_led, led);
    struct asus_laptop *asus = led->asus;

    return asus_kled_lvl(asus);
}

static void asus_led_exit(struct asus_laptop *asus)
{
    if (!IS_ERR_OR_NULL(asus->wled.led.dev))
        led_classdev_unregister(&asus->wled.led);
    if (!IS_ERR_OR_NULL(asus->bled.led.dev))
        led_classdev_unregister(&asus->bled.led);
    if (!IS_ERR_OR_NULL(asus->mled.led.dev))
        led_classdev_unregister(&asus->mled.led);
    if (!IS_ERR_OR_NULL(asus->tled.led.dev))
        led_classdev_unregister(&asus->tled.led);
    if (!IS_ERR_OR_NULL(asus->pled.led.dev))
        led_classdev_unregister(&asus->pled.led);
    if (!IS_ERR_OR_NULL(asus->rled.led.dev))
        led_classdev_unregister(&asus->rled.led);
    if (!IS_ERR_OR_NULL(asus->gled.led.dev))
        led_classdev_unregister(&asus->gled.led);
    if (!IS_ERR_OR_NULL(asus->kled.led.dev))
        led_classdev_unregister(&asus->kled.led);
    if (asus->led_workqueue) {
        destroy_workqueue(asus->led_workqueue);
        asus->led_workqueue = NULL;
    }
}

/*  Ugly macro, need to fix that later */
static int asus_led_register(struct asus_laptop *asus,
                 struct asus_led *led,
                 const char *name, const char *method)
{
    struct led_classdev *led_cdev = &led->led;

    if (!method || acpi_check_handle(asus->handle, method, NULL))
        return 0; /* Led not present */

    led->asus = asus;
    led->method = method;

    INIT_WORK(&led->work, asus_led_cdev_update);
    led_cdev->name = name;
    led_cdev->brightness_set = asus_led_cdev_set;
    led_cdev->brightness_get = asus_led_cdev_get;
    led_cdev->max_brightness = 1;
    return led_classdev_register(&asus->platform_device->dev, led_cdev);
}

static int asus_led_init(struct asus_laptop *asus)
{
    int r = 0;

    /*
     * The Pegatron Lucid has no physical leds, but all methods are
     * available in the DSDT...
     */
    if (asus->is_pega_lucid)
        return 0;

    /*
     * Functions that actually update the LED's are called from a
     * workqueue. By doing this as separate work rather than when the LED
     * subsystem asks, we avoid messing with the Asus ACPI stuff during a
     * potentially bad time, such as a timer interrupt.
     */
    asus->led_workqueue = create_singlethread_workqueue("led_workqueue");
    if (!asus->led_workqueue)
        return -ENOMEM;

    if (asus->wled_type == TYPE_LED)
        r = asus_led_register(asus, &asus->wled, "asus::wlan",
                      METHOD_WLAN);
    if (r)
        goto error;
    if (asus->bled_type == TYPE_LED)
        r = asus_led_register(asus, &asus->bled, "asus::bluetooth",
                      METHOD_BLUETOOTH);
    if (r)
        goto error;
    r = asus_led_register(asus, &asus->mled, "asus::mail", METHOD_MLED);
    if (r)
        goto error;
    r = asus_led_register(asus, &asus->tled, "asus::touchpad", METHOD_TLED);
    if (r)
        goto error;
    r = asus_led_register(asus, &asus->rled, "asus::record", METHOD_RLED);
    if (r)
        goto error;
    r = asus_led_register(asus, &asus->pled, "asus::phone", METHOD_PLED);
    if (r)
        goto error;
    r = asus_led_register(asus, &asus->gled, "asus::gaming", METHOD_GLED);
    if (r)
        goto error;
    if (!acpi_check_handle(asus->handle, METHOD_KBD_LIGHT_SET, NULL) &&
        !acpi_check_handle(asus->handle, METHOD_KBD_LIGHT_GET, NULL)) {
        struct asus_led *led = &asus->kled;
        struct led_classdev *cdev = &led->led;

        led->asus = asus;

        INIT_WORK(&led->work, asus_kled_cdev_update);
        cdev->name = "asus::kbd_backlight";
        cdev->brightness_set = asus_kled_cdev_set;
        cdev->brightness_get = asus_kled_cdev_get;
        cdev->max_brightness = 3;
        r = led_classdev_register(&asus->platform_device->dev, cdev);
    }
error:
    if (r)
        asus_led_exit(asus);
    return r;
}

/*
 * Backlight device
 */
static int asus_read_brightness(struct backlight_device *bd)
{
    struct asus_laptop *asus = bl_get_data(bd);
    unsigned long long value;
    acpi_status rv = AE_OK;

    rv = acpi_evaluate_integer(asus->handle, METHOD_BRIGHTNESS_GET,
                   NULL, &value);
    if (ACPI_FAILURE(rv))
        pr_warn("Error reading brightness\n");

    return value;
}

static int asus_set_brightness(struct backlight_device *bd, int value)
{
    struct asus_laptop *asus = bl_get_data(bd);

    if (write_acpi_int(asus->handle, METHOD_BRIGHTNESS_SET, value)) {
        pr_warn("Error changing brightness\n");
        return -EIO;
    }
    return 0;
}

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

    return asus_set_brightness(bd, value);
}

static const struct backlight_ops asusbl_ops = {
    .get_brightness = asus_read_brightness,
    .update_status = update_bl_status,
};

static int asus_backlight_notify(struct asus_laptop *asus)
{
    struct backlight_device *bd = asus->backlight_device;
    int old = bd->props.brightness;

    backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY);

    return old;
}

static int asus_backlight_init(struct asus_laptop *asus)
{
    struct backlight_device *bd;
    struct backlight_properties props;

    if (acpi_check_handle(asus->handle, METHOD_BRIGHTNESS_GET, NULL) ||
        acpi_check_handle(asus->handle, METHOD_BRIGHTNESS_SET, NULL))
        return 0;

    memset(&props, 0, sizeof(struct backlight_properties));
    props.max_brightness = 15;
    props.type = BACKLIGHT_PLATFORM;

    bd = backlight_device_register(ASUS_LAPTOP_FILE,
                       &asus->platform_device->dev, asus,
                       &asusbl_ops, &props);
    if (IS_ERR(bd)) {
        pr_err("Could not register asus backlight device\n");
        asus->backlight_device = NULL;
        return PTR_ERR(bd);
    }

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

static void asus_backlight_exit(struct asus_laptop *asus)
{
    if (asus->backlight_device)
        backlight_device_unregister(asus->backlight_device);
    asus->backlight_device = NULL;
}

/*
 * Platform device handlers
 */

/*
 * We write our info in page, we begin at offset off and cannot write more
 * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 * number of bytes written in page
 */
static ssize_t show_infos(struct device *dev,
              struct device_attribute *attr, char *page)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);
    int len = 0;
    unsigned long long temp;
    char buf[16];       /* enough for all info */
    acpi_status rv = AE_OK;

    /*
     * We use the easy way, we don't care of off and count,
     * so we don't set eof to 1
     */

    len += sprintf(page, ASUS_LAPTOP_NAME " " ASUS_LAPTOP_VERSION "\n");
    len += sprintf(page + len, "Model reference    : %s\n", asus->name);
    /*
     * The SFUN method probably allows the original driver to get the list
     * of features supported by a given model. For now, 0x0100 or 0x0800
     * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
     * The significance of others is yet to be found.
     */
    rv = acpi_evaluate_integer(asus->handle, "SFUN", NULL, &temp);
    if (!ACPI_FAILURE(rv))
        len += sprintf(page + len, "SFUN value         : %#x\n",
                   (uint) temp);
    /*
     * The HWRS method return informations about the hardware.
     * 0x80 bit is for WLAN, 0x100 for Bluetooth.
     * The significance of others is yet to be found.
     * If we don't find the method, we assume the device are present.
     */
    rv = acpi_evaluate_integer(asus->handle, "HWRS", NULL, &temp);
    if (!ACPI_FAILURE(rv))
        len += sprintf(page + len, "HWRS value         : %#x\n",
                   (uint) temp);
    /*
     * Another value for userspace: the ASYM method returns 0x02 for
     * battery low and 0x04 for battery critical, its readings tend to be
     * more accurate than those provided by _BST.
     * Note: since not all the laptops provide this method, errors are
     * silently ignored.
     */
    rv = acpi_evaluate_integer(asus->handle, "ASYM", NULL, &temp);
    if (!ACPI_FAILURE(rv))
        len += sprintf(page + len, "ASYM value         : %#x\n",
                   (uint) temp);
    if (asus->dsdt_info) {
        snprintf(buf, 16, "%d", asus->dsdt_info->length);
        len += sprintf(page + len, "DSDT length        : %s\n", buf);
        snprintf(buf, 16, "%d", asus->dsdt_info->checksum);
        len += sprintf(page + len, "DSDT checksum      : %s\n", buf);
        snprintf(buf, 16, "%d", asus->dsdt_info->revision);
        len += sprintf(page + len, "DSDT revision      : %s\n", buf);
        snprintf(buf, 7, "%s", asus->dsdt_info->oem_id);
        len += sprintf(page + len, "OEM id             : %s\n", buf);
        snprintf(buf, 9, "%s", asus->dsdt_info->oem_table_id);
        len += sprintf(page + len, "OEM table id       : %s\n", buf);
        snprintf(buf, 16, "%x", asus->dsdt_info->oem_revision);
        len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);
        snprintf(buf, 5, "%s", asus->dsdt_info->asl_compiler_id);
        len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
        snprintf(buf, 16, "%x", asus->dsdt_info->asl_compiler_revision);
        len += sprintf(page + len, "ASL comp revision  : 0x%s\n", buf);
    }

    return len;
}

static int parse_arg(const char *buf, unsigned long count, int *val)
{
    if (!count)
        return 0;
    if (count > 31)
        return -EINVAL;
    if (sscanf(buf, "%i", val) != 1)
        return -EINVAL;
    return count;
}

static ssize_t sysfs_acpi_set(struct asus_laptop *asus,
                  const char *buf, size_t count,
                  const char *method)
{
    int rv, value;
    int out = 0;

    rv = parse_arg(buf, count, &value);
    if (rv > 0)
        out = value ? 1 : 0;

    if (write_acpi_int(asus->handle, method, value))
        return -ENODEV;
    return rv;
}

/*
 * LEDD display
 */
static ssize_t show_ledd(struct device *dev,
             struct device_attribute *attr, char *buf)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);

    return sprintf(buf, "0x%08x\n", asus->ledd_status);
}

static ssize_t store_ledd(struct device *dev, struct device_attribute *attr,
              const char *buf, size_t count)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);
    int rv, value;

    rv = parse_arg(buf, count, &value);
    if (rv > 0) {
        if (write_acpi_int(asus->handle, METHOD_LEDD, value)) {
            pr_warn("LED display write failed\n");
            return -ENODEV;
        }
        asus->ledd_status = (u32) value;
    }
    return rv;
}

/*
 * Wireless
 */
static int asus_wireless_status(struct asus_laptop *asus, int mask)
{
    unsigned long long status;
    acpi_status rv = AE_OK;

    if (!asus->have_rsts)
        return (asus->wireless_status & mask) ? 1 : 0;

    rv = acpi_evaluate_integer(asus->handle, METHOD_WL_STATUS,
                   NULL, &status);
    if (ACPI_FAILURE(rv)) {
        pr_warn("Error reading Wireless status\n");
        return -EINVAL;
    }
    return !!(status & mask);
}

/*
 * WLAN
 */
static int asus_wlan_set(struct asus_laptop *asus, int status)
{
    if (write_acpi_int(asus->handle, METHOD_WLAN, !!status)) {
        pr_warn("Error setting wlan status to %d\n", status);
        return -EIO;
    }
    return 0;
}

static ssize_t show_wlan(struct device *dev,
             struct device_attribute *attr, char *buf)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);

    return sprintf(buf, "%d\n", asus_wireless_status(asus, WL_RSTS));
}

static ssize_t store_wlan(struct device *dev, struct device_attribute *attr,
              const char *buf, size_t count)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);

    return sysfs_acpi_set(asus, buf, count, METHOD_WLAN);
}

/*e
 * Bluetooth
 */
static int asus_bluetooth_set(struct asus_laptop *asus, int status)
{
    if (write_acpi_int(asus->handle, METHOD_BLUETOOTH, !!status)) {
        pr_warn("Error setting bluetooth status to %d\n", status);
        return -EIO;
    }
    return 0;
}

static ssize_t show_bluetooth(struct device *dev,
                  struct device_attribute *attr, char *buf)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);

    return sprintf(buf, "%d\n", asus_wireless_status(asus, BT_RSTS));
}

static ssize_t store_bluetooth(struct device *dev,
                   struct device_attribute *attr, const char *buf,
                   size_t count)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);

    return sysfs_acpi_set(asus, buf, count, METHOD_BLUETOOTH);
}

/*
 * Wimax
 */
static int asus_wimax_set(struct asus_laptop *asus, int status)
{
    if (write_acpi_int(asus->handle, METHOD_WIMAX, !!status)) {
        pr_warn("Error setting wimax status to %d\n", status);
        return -EIO;
    }
    return 0;
}

static ssize_t show_wimax(struct device *dev,
                  struct device_attribute *attr, char *buf)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);

    return sprintf(buf, "%d\n", asus_wireless_status(asus, WM_RSTS));
}

static ssize_t store_wimax(struct device *dev,
                   struct device_attribute *attr, const char *buf,
                   size_t count)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);

    return sysfs_acpi_set(asus, buf, count, METHOD_WIMAX);
}

/*
 * Wwan
 */
static int asus_wwan_set(struct asus_laptop *asus, int status)
{
    if (write_acpi_int(asus->handle, METHOD_WWAN, !!status)) {
        pr_warn("Error setting wwan status to %d\n", status);
        return -EIO;
    }
    return 0;
}

static ssize_t show_wwan(struct device *dev,
                  struct device_attribute *attr, char *buf)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);

    return sprintf(buf, "%d\n", asus_wireless_status(asus, WW_RSTS));
}

static ssize_t store_wwan(struct device *dev,
                   struct device_attribute *attr, const char *buf,
                   size_t count)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);

    return sysfs_acpi_set(asus, buf, count, METHOD_WWAN);
}

/*
 * Display
 */
static void asus_set_display(struct asus_laptop *asus, int value)
{
    /* no sanity check needed for now */
    if (write_acpi_int(asus->handle, METHOD_SWITCH_DISPLAY, value))
        pr_warn("Error setting display\n");
    return;
}

/*
 * Experimental support for display switching. As of now: 1 should activate
 * the LCD output, 2 should do for CRT, 4 for TV-Out and 8 for DVI.
 * Any combination (bitwise) of these will suffice. I never actually tested 4
 * displays hooked up simultaneously, so be warned. See the acpi4asus README
 * for more info.
 */
static ssize_t store_disp(struct device *dev, struct device_attribute *attr,
              const char *buf, size_t count)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);
    int rv, value;

    rv = parse_arg(buf, count, &value);
    if (rv > 0)
        asus_set_display(asus, value);
    return rv;
}

/*
 * Light Sens
 */
static void asus_als_switch(struct asus_laptop *asus, int value)
{
    int ret;

    if (asus->is_pega_lucid) {
        ret = asus_pega_lucid_set(asus, PEGA_ALS, value);
        if (!ret)
            ret = asus_pega_lucid_set(asus, PEGA_ALS_POWER, value);
    } else {
        ret = write_acpi_int(asus->handle, METHOD_ALS_CONTROL, value);
    }
    if (ret)
        pr_warning("Error setting light sensor switch\n");

    asus->light_switch = value;
}

static ssize_t show_lssw(struct device *dev,
             struct device_attribute *attr, char *buf)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);

    return sprintf(buf, "%d\n", asus->light_switch);
}

static ssize_t store_lssw(struct device *dev, struct device_attribute *attr,
              const char *buf, size_t count)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);
    int rv, value;

    rv = parse_arg(buf, count, &value);
    if (rv > 0)
        asus_als_switch(asus, value ? 1 : 0);

    return rv;
}

static void asus_als_level(struct asus_laptop *asus, int value)
{
    if (write_acpi_int(asus->handle, METHOD_ALS_LEVEL, value))
        pr_warn("Error setting light sensor level\n");
    asus->light_level = value;
}

static ssize_t show_lslvl(struct device *dev,
              struct device_attribute *attr, char *buf)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);

    return sprintf(buf, "%d\n", asus->light_level);
}

static ssize_t store_lslvl(struct device *dev, struct device_attribute *attr,
               const char *buf, size_t count)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);
    int rv, value;

    rv = parse_arg(buf, count, &value);
    if (rv > 0) {
        value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
        /* 0 <= value <= 15 */
        asus_als_level(asus, value);
    }

    return rv;
}

static int pega_int_read(struct asus_laptop *asus, int arg, int *result)
{
    struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
    int err = write_acpi_int_ret(asus->handle, METHOD_PEGA_READ, arg,
                     &buffer);
    if (!err) {
        union acpi_object *obj = buffer.pointer;
        if (obj && obj->type == ACPI_TYPE_INTEGER)
            *result = obj->integer.value;
        else
            err = -EIO;
    }
    return err;
}

static ssize_t show_lsvalue(struct device *dev,
                struct device_attribute *attr, char *buf)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);
    int err, hi, lo;

    err = pega_int_read(asus, PEGA_READ_ALS_H, &hi);
    if (!err)
        err = pega_int_read(asus, PEGA_READ_ALS_L, &lo);
    if (!err)
        return sprintf(buf, "%d\n", 10 * hi + lo);
    return err;
}

/*
 * GPS
 */
static int asus_gps_status(struct asus_laptop *asus)
{
    unsigned long long status;
    acpi_status rv = AE_OK;

    rv = acpi_evaluate_integer(asus->handle, METHOD_GPS_STATUS,
                   NULL, &status);
    if (ACPI_FAILURE(rv)) {
        pr_warn("Error reading GPS status\n");
        return -ENODEV;
    }
    return !!status;
}

static int asus_gps_switch(struct asus_laptop *asus, int status)
{
    const char *meth = status ? METHOD_GPS_ON : METHOD_GPS_OFF;

    if (write_acpi_int(asus->handle, meth, 0x02))
        return -ENODEV;
    return 0;
}

static ssize_t show_gps(struct device *dev,
            struct device_attribute *attr, char *buf)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);

    return sprintf(buf, "%d\n", asus_gps_status(asus));
}

static ssize_t store_gps(struct device *dev, struct device_attribute *attr,
             const char *buf, size_t count)
{
    struct asus_laptop *asus = dev_get_drvdata(dev);
    int rv, value;
    int ret;

    rv = parse_arg(buf, count, &value);
    if (rv <= 0)
        return -EINVAL;
    ret = asus_gps_switch(asus, !!value);
    if (ret)
        return ret;
    rfkill_set_sw_state(asus->gps.rfkill, !value);
    return rv;
}

/*
 * rfkill
 */
static int asus_gps_rfkill_set(void *data, bool blocked)
{
    struct asus_laptop *asus = data;

    return asus_gps_switch(asus, !blocked);
}

static const struct rfkill_ops asus_gps_rfkill_ops = {
    .set_block = asus_gps_rfkill_set,
};

static int asus_rfkill_set(void *data, bool blocked)
{
    struct asus_rfkill *rfk = data;
    struct asus_laptop *asus = rfk->asus;

    if (rfk->control_id == WL_RSTS)
        return asus_wlan_set(asus, !blocked);
    else if (rfk->control_id == BT_RSTS)
        return asus_bluetooth_set(asus, !blocked);
    else if (rfk->control_id == WM_RSTS)
        return asus_wimax_set(asus, !blocked);
    else if (rfk->control_id == WW_RSTS)
        return asus_wwan_set(asus, !blocked);

    return -EINVAL;
}

static const struct rfkill_ops asus_rfkill_ops = {
    .set_block = asus_rfkill_set,
};

static void asus_rfkill_terminate(struct asus_rfkill *rfk)
{
    if (!rfk->rfkill)
        return ;

    rfkill_unregister(rfk->rfkill);
    rfkill_destroy(rfk->rfkill);
    rfk->rfkill = NULL;
}

static void asus_rfkill_exit(struct asus_laptop *asus)
{
    asus_rfkill_terminate(&asus->wwan);
    asus_rfkill_terminate(&asus->bluetooth);
    asus_rfkill_terminate(&asus->wlan);
    asus_rfkill_terminate(&asus->gps);
}

static int asus_rfkill_setup(struct asus_laptop *asus, struct asus_rfkill *rfk,
                 const char *name, int control_id, int type,
                 const struct rfkill_ops *ops)
{
    int result;

    rfk->control_id = control_id;
    rfk->asus = asus;
    rfk->rfkill = rfkill_alloc(name, &asus->platform_device->dev,
                   type, ops, rfk);
    if (!rfk->rfkill)
        return -EINVAL;

    result = rfkill_register(rfk->rfkill);
    if (result) {
        rfkill_destroy(rfk->rfkill);
        rfk->rfkill = NULL;
    }

    return result;
}

static int asus_rfkill_init(struct asus_laptop *asus)
{
    int result = 0;

    if (asus->is_pega_lucid)
        return -ENODEV;

    if (!acpi_check_handle(asus->handle, METHOD_GPS_ON, NULL) &&
        !acpi_check_handle(asus->handle, METHOD_GPS_OFF, NULL) &&
        !acpi_check_handle(asus->handle, METHOD_GPS_STATUS, NULL))
        result = asus_rfkill_setup(asus, &asus->gps, "asus-gps",
                       -1, RFKILL_TYPE_GPS,
                       &asus_gps_rfkill_ops);
    if (result)
        goto exit;


    if (!acpi_check_handle(asus->handle, METHOD_WLAN, NULL) &&
        asus->wled_type == TYPE_RFKILL)
        result = asus_rfkill_setup(asus, &asus->wlan, "asus-wlan",
                       WL_RSTS, RFKILL_TYPE_WLAN,
                       &asus_rfkill_ops);
    if (result)
        goto exit;

    if (!acpi_check_handle(asus->handle, METHOD_BLUETOOTH, NULL) &&
        asus->bled_type == TYPE_RFKILL)
        result = asus_rfkill_setup(asus, &asus->bluetooth,
                       "asus-bluetooth", BT_RSTS,
                       RFKILL_TYPE_BLUETOOTH,
                       &asus_rfkill_ops);
    if (result)
        goto exit;

    if (!acpi_check_handle(asus->handle, METHOD_WWAN, NULL))
        result = asus_rfkill_setup(asus, &asus->wwan, "asus-wwan",
                       WW_RSTS, RFKILL_TYPE_WWAN,
                       &asus_rfkill_ops);
    if (result)
        goto exit;

    if (!acpi_check_handle(asus->handle, METHOD_WIMAX, NULL))
        result = asus_rfkill_setup(asus, &asus->wimax, "asus-wimax",
                       WM_RSTS, RFKILL_TYPE_WIMAX,
                       &asus_rfkill_ops);
    if (result)
        goto exit;

exit:
    if (result)
        asus_rfkill_exit(asus);

    return result;
}

static int pega_rfkill_set(void *data, bool blocked)
{
    struct asus_rfkill *rfk = data;

    int ret = asus_pega_lucid_set(rfk->asus, rfk->control_id, !blocked);
    return ret;
}

static const struct rfkill_ops pega_rfkill_ops = {
    .set_block = pega_rfkill_set,
};

static int pega_rfkill_setup(struct asus_laptop *asus, struct asus_rfkill *rfk,
                 const char *name, int controlid, int rfkill_type)
{
    return asus_rfkill_setup(asus, rfk, name, controlid, rfkill_type,
                 &pega_rfkill_ops);
}

static int pega_rfkill_init(struct asus_laptop *asus)
{
    int ret = 0;

    if(!asus->is_pega_lucid)
        return -ENODEV;

    ret = pega_rfkill_setup(asus, &asus->wlan, "pega-wlan",
                PEGA_WLAN, RFKILL_TYPE_WLAN);
    if(ret)
        goto exit;

    ret = pega_rfkill_setup(asus, &asus->bluetooth, "pega-bt",
                PEGA_BLUETOOTH, RFKILL_TYPE_BLUETOOTH);
    if(ret)
        goto exit;

    ret = pega_rfkill_setup(asus, &asus->wwan, "pega-wwan",
                PEGA_WWAN, RFKILL_TYPE_WWAN);

exit:
    if (ret)
        asus_rfkill_exit(asus);

    return ret;
}

/*
 * Input device (i.e. hotkeys)
 */
static void asus_input_notify(struct asus_laptop *asus, int event)
{
    if (!asus->inputdev)
        return ;
    if (!sparse_keymap_report_event(asus->inputdev, event, 1, true))
        pr_info("Unknown key %x pressed\n", event);
}

static int asus_input_init(struct asus_laptop *asus)
{
    struct input_dev *input;
    int error;

    input = input_allocate_device();
    if (!input) {
        pr_warn("Unable to allocate input device\n");
        return -ENOMEM;
    }
    input->name = "Asus Laptop extra buttons";
    input->phys = ASUS_LAPTOP_FILE "/input0";
    input->id.bustype = BUS_HOST;
    input->dev.parent = &asus->platform_device->dev;

    error = sparse_keymap_setup(input, asus_keymap, NULL);
    if (error) {
        pr_err("Unable to setup input device keymap\n");
        goto err_free_dev;
    }
    error = input_register_device(input);
    if (error) {
        pr_warn("Unable to register input device\n");
        goto err_free_keymap;
    }

    asus->inputdev = input;
    return 0;

err_free_keymap:
    sparse_keymap_free(input);
err_free_dev:
    input_free_device(input);
    return error;
}

static void asus_input_exit(struct asus_laptop *asus)
{
    if (asus->inputdev) {
        sparse_keymap_free(asus->inputdev);
        input_unregister_device(asus->inputdev);
    }
    asus->inputdev = NULL;
}

/*
 * ACPI driver
 */
static void asus_acpi_notify(struct acpi_device *device, u32 event)
{
    struct asus_laptop *asus = acpi_driver_data(device);
    u16 count;

    /* TODO Find a better way to handle events count. */
    count = asus->event_count[event % 128]++;
    acpi_bus_generate_proc_event(asus->device, event, count);
    acpi_bus_generate_netlink_event(asus->device->pnp.device_class,
                    dev_name(&asus->device->dev), event,
                    count);

    /* Brightness events are special */
    if (event >= ATKD_BR_MIN && event <= ATKD_BR_MAX) {

        /* Ignore them completely if the acpi video driver is used */
        if (asus->backlight_device != NULL) {
            /* Update the backlight device. */
            asus_backlight_notify(asus);
        }
        return ;
    }

    /* Accelerometer "coarse orientation change" event */
    if (asus->pega_accel_poll && event == 0xEA) {
        kobject_uevent(&asus->pega_accel_poll->input->dev.kobj,
                   KOBJ_CHANGE);
        return ;
    }

    asus_input_notify(asus, event);
}

static DEVICE_ATTR(infos, S_IRUGO, show_infos, NULL);
static DEVICE_ATTR(wlan, S_IRUGO | S_IWUSR, show_wlan, store_wlan);
static DEVICE_ATTR(bluetooth, S_IRUGO | S_IWUSR,
           show_bluetooth, store_bluetooth);
static DEVICE_ATTR(wimax, S_IRUGO | S_IWUSR, show_wimax, store_wimax);
static DEVICE_ATTR(wwan, S_IRUGO | S_IWUSR, show_wwan, store_wwan);
static DEVICE_ATTR(display, S_IWUSR, NULL, store_disp);
static DEVICE_ATTR(ledd, S_IRUGO | S_IWUSR, show_ledd, store_ledd);
static DEVICE_ATTR(ls_value, S_IRUGO, show_lsvalue, NULL);
static DEVICE_ATTR(ls_level, S_IRUGO | S_IWUSR, show_lslvl, store_lslvl);
static DEVICE_ATTR(ls_switch, S_IRUGO | S_IWUSR, show_lssw, store_lssw);
static DEVICE_ATTR(gps, S_IRUGO | S_IWUSR, show_gps, store_gps);

static struct attribute *asus_attributes[] = {
    &dev_attr_infos.attr,
    &dev_attr_wlan.attr,
    &dev_attr_bluetooth.attr,
    &dev_attr_wimax.attr,
    &dev_attr_wwan.attr,
    &dev_attr_display.attr,
    &dev_attr_ledd.attr,
    &dev_attr_ls_value.attr,
    &dev_attr_ls_level.attr,
    &dev_attr_ls_switch.attr,
    &dev_attr_gps.attr,
    NULL
};

static umode_t asus_sysfs_is_visible(struct kobject *kobj,
                    struct attribute *attr,
                    int idx)
{
    struct device *dev = container_of(kobj, struct device, kobj);
    struct platform_device *pdev = to_platform_device(dev);
    struct asus_laptop *asus = platform_get_drvdata(pdev);
    acpi_handle handle = asus->handle;
    bool supported;

    if (asus->is_pega_lucid) {
        /* no ls_level interface on the Lucid */
        if (attr == &dev_attr_ls_switch.attr)
            supported = true;
        else if (attr == &dev_attr_ls_level.attr)
            supported = false;
        else
            goto normal;

        return supported;
    }

normal:
    if (attr == &dev_attr_wlan.attr) {
        supported = !acpi_check_handle(handle, METHOD_WLAN, NULL);

    } else if (attr == &dev_attr_bluetooth.attr) {
        supported = !acpi_check_handle(handle, METHOD_BLUETOOTH, NULL);

    } else if (attr == &dev_attr_display.attr) {
        supported = !acpi_check_handle(handle, METHOD_SWITCH_DISPLAY, NULL);

    } else if (attr == &dev_attr_wimax.attr) {
        supported =
            !acpi_check_handle(asus->handle, METHOD_WIMAX, NULL);

    } else if (attr == &dev_attr_wwan.attr) {
        supported = !acpi_check_handle(asus->handle, METHOD_WWAN, NULL);

    } else if (attr == &dev_attr_ledd.attr) {
        supported = !acpi_check_handle(handle, METHOD_LEDD, NULL);

    } else if (attr == &dev_attr_ls_switch.attr ||
           attr == &dev_attr_ls_level.attr) {
        supported = !acpi_check_handle(handle, METHOD_ALS_CONTROL, NULL) &&
            !acpi_check_handle(handle, METHOD_ALS_LEVEL, NULL);
    } else if (attr == &dev_attr_ls_value.attr) {
        supported = asus->is_pega_lucid;
    } else if (attr == &dev_attr_gps.attr) {
        supported = !acpi_check_handle(handle, METHOD_GPS_ON, NULL) &&
                !acpi_check_handle(handle, METHOD_GPS_OFF, NULL) &&
                !acpi_check_handle(handle, METHOD_GPS_STATUS, NULL);
    } else {
        supported = true;
    }

    return supported ? attr->mode : 0;
}


static const struct attribute_group asus_attr_group = {
    .is_visible = asus_sysfs_is_visible,
    .attrs      = asus_attributes,
};

static int asus_platform_init(struct asus_laptop *asus)
{
    int result;

    asus->platform_device = platform_device_alloc(ASUS_LAPTOP_FILE, -1);
    if (!asus->platform_device)
        return -ENOMEM;
    platform_set_drvdata(asus->platform_device, asus);

    result = platform_device_add(asus->platform_device);
    if (result)
        goto fail_platform_device;

    result = sysfs_create_group(&asus->platform_device->dev.kobj,
                    &asus_attr_group);
    if (result)
        goto fail_sysfs;

    return 0;

fail_sysfs:
    platform_device_del(asus->platform_device);
fail_platform_device:
    platform_device_put(asus->platform_device);
    return result;
}

static void asus_platform_exit(struct asus_laptop *asus)
{
    sysfs_remove_group(&asus->platform_device->dev.kobj, &asus_attr_group);
    platform_device_unregister(asus->platform_device);
}

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

/*
 * This function is used to initialize the context with right values. In this
 * method, we can make all the detection we want, and modify the asus_laptop
 * struct
 */
static int asus_laptop_get_info(struct asus_laptop *asus)
{
    struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
    union acpi_object *model = NULL;
    unsigned long long bsts_result, hwrs_result;
    char *string = NULL;
    acpi_status status;

    /*
     * Get DSDT headers early enough to allow for differentiating between
     * models, but late enough to allow acpi_bus_register_driver() to fail
     * before doing anything ACPI-specific. Should we encounter a machine,
     * which needs special handling (i.e. its hotkey device has a different
     * HID), this bit will be moved.
     */
    status = acpi_get_table(ACPI_SIG_DSDT, 1, &asus->dsdt_info);
    if (ACPI_FAILURE(status))
        pr_warn("Couldn't get the DSDT table header\n");

    /* We have to write 0 on init this far for all ASUS models */
    if (write_acpi_int_ret(asus->handle, "INIT", 0, &buffer)) {
        pr_err("Hotkey initialization failed\n");
        return -ENODEV;
    }

    /* This needs to be called for some laptops to init properly */
    status =
        acpi_evaluate_integer(asus->handle, "BSTS", NULL, &bsts_result);
    if (ACPI_FAILURE(status))
        pr_warn("Error calling BSTS\n");
    else if (bsts_result)
        pr_notice("BSTS called, 0x%02x returned\n",
               (uint) bsts_result);

    /* This too ... */
    if (write_acpi_int(asus->handle, "CWAP", wapf))
        pr_err("Error calling CWAP(%d)\n", wapf);
    /*
     * Try to match the object returned by INIT to the specific model.
     * Handle every possible object (or the lack of thereof) the DSDT
     * writers might throw at us. When in trouble, we pass NULL to
     * asus_model_match() and try something completely different.
     */
    if (buffer.pointer) {
        model = buffer.pointer;
        switch (model->type) {
        case ACPI_TYPE_STRING:
            string = model->string.pointer;
            break;
        case ACPI_TYPE_BUFFER:
            string = model->buffer.pointer;
            break;
        default:
            string = "";
            break;
        }
    }
    asus->name = kstrdup(string, GFP_KERNEL);
    if (!asus->name) {
        kfree(buffer.pointer);
        return -ENOMEM;
    }

    if (*string)
        pr_notice("  %s model detected\n", string);

    /*
     * The HWRS method return informations about the hardware.
     * 0x80 bit is for WLAN, 0x100 for Bluetooth,
     * 0x40 for WWAN, 0x10 for WIMAX.
     * The significance of others is yet to be found.
     */
    status =
        acpi_evaluate_integer(asus->handle, "HWRS", NULL, &hwrs_result);
    if (!ACPI_FAILURE(status))
        pr_notice("  HWRS returned %x", (int)hwrs_result);

    if (!acpi_check_handle(asus->handle, METHOD_WL_STATUS, NULL))
        asus->have_rsts = true;

    kfree(model);

    return AE_OK;
}

static int __devinit asus_acpi_init(struct asus_laptop *asus)
{
    int result = 0;

    result = acpi_bus_get_status(asus->device);
    if (result)
        return result;
    if (!asus->device->status.present) {
        pr_err("Hotkey device not present, aborting\n");
        return -ENODEV;
    }

    result = asus_laptop_get_info(asus);
    if (result)
        return result;

    if (!strcmp(bled_type, "led"))
        asus->bled_type = TYPE_LED;
    else if (!strcmp(bled_type, "rfkill"))
        asus->bled_type = TYPE_RFKILL;

    if (!strcmp(wled_type, "led"))
        asus->wled_type = TYPE_LED;
    else if (!strcmp(wled_type, "rfkill"))
        asus->wled_type = TYPE_RFKILL;

    if (bluetooth_status >= 0)
        asus_bluetooth_set(asus, !!bluetooth_status);

    if (wlan_status >= 0)
        asus_wlan_set(asus, !!wlan_status);

    if (wimax_status >= 0)
        asus_wimax_set(asus, !!wimax_status);

    if (wwan_status >= 0)
        asus_wwan_set(asus, !!wwan_status);

    /* Keyboard Backlight is on by default */
    if (!acpi_check_handle(asus->handle, METHOD_KBD_LIGHT_SET, NULL))
        asus_kled_set(asus, 1);

    /* LED display is off by default */
    asus->ledd_status = 0xFFF;

    /* Set initial values of light sensor and level */
    asus->light_switch = !!als_status;
    asus->light_level = 5;  /* level 5 for sensor sensitivity */

    if (asus->is_pega_lucid) {
        asus_als_switch(asus, asus->light_switch);
    } else if (!acpi_check_handle(asus->handle, METHOD_ALS_CONTROL, NULL) &&
           !acpi_check_handle(asus->handle, METHOD_ALS_LEVEL, NULL)) {
        asus_als_switch(asus, asus->light_switch);
        asus_als_level(asus, asus->light_level);
    }

    return result;
}

static void __devinit asus_dmi_check(void)
{
    const char *model;

    model = dmi_get_system_info(DMI_PRODUCT_NAME);
    if (!model)
        return;

    /* On L1400B WLED control the sound card, don't mess with it ... */
    if (strncmp(model, "L1400B", 6) == 0) {
        wlan_status = -1;
    }
}

static bool asus_device_present;

static int __devinit asus_acpi_add(struct acpi_device *device)
{
    struct asus_laptop *asus;
    int result;

    pr_notice("Asus Laptop Support version %s\n",
          ASUS_LAPTOP_VERSION);
    asus = kzalloc(sizeof(struct asus_laptop), GFP_KERNEL);
    if (!asus)
        return -ENOMEM;
    asus->handle = device->handle;
    strcpy(acpi_device_name(device), ASUS_LAPTOP_DEVICE_NAME);
    strcpy(acpi_device_class(device), ASUS_LAPTOP_CLASS);
    device->driver_data = asus;
    asus->device = device;

    asus_dmi_check();

    result = asus_acpi_init(asus);
    if (result)
        goto fail_platform;

    /*
     * Need platform type detection first, then the platform
     * device.  It is used as a parent for the sub-devices below.
     */
    asus->is_pega_lucid = asus_check_pega_lucid(asus);
    result = asus_platform_init(asus);
    if (result)
        goto fail_platform;

    if (!acpi_video_backlight_support()) {
        result = asus_backlight_init(asus);
        if (result)
            goto fail_backlight;
    } else
        pr_info("Backlight controlled by ACPI video driver\n");

    result = asus_input_init(asus);
    if (result)
        goto fail_input;

    result = asus_led_init(asus);
    if (result)
        goto fail_led;

    result = asus_rfkill_init(asus);
    if (result && result != -ENODEV)
        goto fail_rfkill;

    result = pega_accel_init(asus);
    if (result && result != -ENODEV)
        goto fail_pega_accel;

    result = pega_rfkill_init(asus);
    if (result && result != -ENODEV)
        goto fail_pega_rfkill;

    asus_device_present = true;
    return 0;

fail_pega_rfkill:
    pega_accel_exit(asus);
fail_pega_accel:
    asus_rfkill_exit(asus);
fail_rfkill:
    asus_led_exit(asus);
fail_led:
    asus_input_exit(asus);
fail_input:
    asus_backlight_exit(asus);
fail_backlight:
    asus_platform_exit(asus);
fail_platform:
    kfree(asus->name);
    kfree(asus);

    return result;
}

static int asus_acpi_remove(struct acpi_device *device, int type)
{
    struct asus_laptop *asus = acpi_driver_data(device);

    asus_backlight_exit(asus);
    asus_rfkill_exit(asus);
    asus_led_exit(asus);
    asus_input_exit(asus);
    pega_accel_exit(asus);
    asus_platform_exit(asus);

    kfree(asus->name);
    kfree(asus);
    return 0;
}

static const struct acpi_device_id asus_device_ids[] = {
    {"ATK0100", 0},
    {"ATK0101", 0},
    {"", 0},
};
MODULE_DEVICE_TABLE(acpi, asus_device_ids);

static struct acpi_driver asus_acpi_driver = {
    .name = ASUS_LAPTOP_NAME,
    .class = ASUS_LAPTOP_CLASS,
    .owner = THIS_MODULE,
    .ids = asus_device_ids,
    .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
    .ops = {
        .add = asus_acpi_add,
        .remove = asus_acpi_remove,
        .notify = asus_acpi_notify,
        },
};

static int __init asus_laptop_init(void)
{
    int result;

    result = platform_driver_register(&platform_driver);
    if (result < 0)
        return result;

    result = acpi_bus_register_driver(&asus_acpi_driver);
    if (result < 0)
        goto fail_acpi_driver;
    if (!asus_device_present) {
        result = -ENODEV;
        goto fail_no_device;
    }
    return 0;

fail_no_device:
    acpi_bus_unregister_driver(&asus_acpi_driver);
fail_acpi_driver:
    platform_driver_unregister(&platform_driver);
    return result;
}

static void __exit asus_laptop_exit(void)
{
    acpi_bus_unregister_driver(&asus_acpi_driver);
    platform_driver_unregister(&platform_driver);
}

module_init(asus_laptop_init);
module_exit(asus_laptop_exit);