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asus-laptop.c

/*
 *  asus-laptop.c - Asus Laptop Support
 *
 *
 *  Copyright (C) 2002-2005 Julien Lerouge, 2003-2006 Karol Kozimor
 *  Copyright (C) 2006-2007 Corentin Chary
 *
 *  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 helpfull
 *  Sam Lin        - GPS support
 */

#include <linux/autoconf.h>
#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 <acpi/acpi_drivers.h>
#include <acpi/acpi_bus.h>
#include <asm/uaccess.h>

#define ASUS_LAPTOP_VERSION "0.42"

#define ASUS_HOTK_NAME          "Asus Laptop Support"
#define ASUS_HOTK_CLASS         "hotkey"
#define ASUS_HOTK_DEVICE_NAME   "Hotkey"
#define ASUS_HOTK_FILE          "asus-laptop"
#define ASUS_HOTK_PREFIX        "\\_SB.ATKD."

/*
 * Some events we use, same for all Asus
 */
#define ATKD_BR_UP       0x10
#define ATKD_BR_DOWN     0x20
#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_ON       0x01      //internal Wifi
#define BT_ON       0x02      //internal Bluetooth
#define MLED_ON     0x04      //mail LED
#define TLED_ON     0x08      //touchpad LED
#define RLED_ON     0x10      //Record LED
#define PLED_ON     0x20      //Phone LED
#define GLED_ON     0x40      //Gaming LED
#define LCD_ON      0x80      //LCD backlight
#define GPS_ON      0x100     //GPS

#define ASUS_LOG    ASUS_HOTK_FILE ": "
#define ASUS_ERR    KERN_ERR    ASUS_LOG
#define ASUS_WARNING    KERN_WARNING    ASUS_LOG
#define ASUS_NOTICE KERN_NOTICE ASUS_LOG
#define ASUS_INFO   KERN_INFO   ASUS_LOG
#define ASUS_DEBUG  KERN_DEBUG  ASUS_LOG

MODULE_AUTHOR("Julien Lerouge, Karol Kozimor, Corentin Chary");
MODULE_DESCRIPTION(ASUS_HOTK_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:
 * 0x0 will do nothing
 * 0x1 will allow to control the device with Fn+Fx key.
 * 0x4 will send an ACPI event (0x88) while pressing the Fn+Fx key
 * 0x5 like 0x1 or 0x4
 * So, if something doesn't work as you want, just try other values =)
 */
static uint wapf = 1;
module_param(wapf, uint, 0644);
MODULE_PARM_DESC(wapf, "WAPF value");

#define ASUS_HANDLE(object, paths...)                             \
      static acpi_handle  object##_handle = NULL;                 \
      static char *object##_paths[] = { paths }

/* LED */
ASUS_HANDLE(mled_set, ASUS_HOTK_PREFIX "MLED");
ASUS_HANDLE(tled_set, ASUS_HOTK_PREFIX "TLED");
ASUS_HANDLE(rled_set, ASUS_HOTK_PREFIX "RLED"); /* W1JC */
ASUS_HANDLE(pled_set, ASUS_HOTK_PREFIX "PLED"); /* A7J */
ASUS_HANDLE(gled_set, ASUS_HOTK_PREFIX "GLED"); /* G1, G2 (probably) */

/* LEDD */
ASUS_HANDLE(ledd_set, ASUS_HOTK_PREFIX "SLCM");

/* Bluetooth and WLAN
 * WLED and BLED are not handled like other XLED, because in some dsdt
 * they also control the WLAN/Bluetooth device.
 */
ASUS_HANDLE(wl_switch, ASUS_HOTK_PREFIX "WLED");
ASUS_HANDLE(bt_switch, ASUS_HOTK_PREFIX "BLED");
ASUS_HANDLE(wireless_status, ASUS_HOTK_PREFIX "RSTS");      /* All new models */

/* Brightness */
ASUS_HANDLE(brightness_set, ASUS_HOTK_PREFIX "SPLV");
ASUS_HANDLE(brightness_get, ASUS_HOTK_PREFIX "GPLV");

/* Backlight */
ASUS_HANDLE(lcd_switch, "\\_SB.PCI0.SBRG.EC0._Q10",   /* All new models */
          "\\_SB.PCI0.ISA.EC0._Q10",      /* A1x */
          "\\_SB.PCI0.PX40.ECD0._Q10",    /* L3C */
          "\\_SB.PCI0.PX40.EC0.Q10",      /* M1A */
          "\\_SB.PCI0.LPCB.EC0._Q10",     /* P30 */
          "\\_SB.PCI0.PX40.Q10",    /* S1x */
          "\\Q10");           /* A2x, L2D, L3D, M2E */

/* Display */
ASUS_HANDLE(display_set, ASUS_HOTK_PREFIX "SDSP");
ASUS_HANDLE(display_get, "\\_SB.PCI0.P0P1.VGA.GETD",  /*  A6B, A6K A6R A7D F3JM L4R M6R A3G
                                             M6A M6V VX-1 V6J V6V W3Z */
          "\\_SB.PCI0.P0P2.VGA.GETD",     /* A3E A4K, A4D A4L A6J A7J A8J Z71V M9V
                                 S5A M5A z33A W1Jc W2V G1 */
          "\\_SB.PCI0.P0P3.VGA.GETD",     /* A6V A6Q */
          "\\_SB.PCI0.P0PA.VGA.GETD",     /* A6T, A6M */
          "\\_SB.PCI0.PCI1.VGAC.NMAP",    /* L3C */
          "\\_SB.PCI0.VGA.GETD",    /* Z96F */
          "\\ACTD",           /* A2D */
          "\\ADVG",           /* A4G Z71A W1N W5A W5F M2N M3N M5N M6N S1N S5N */
          "\\DNXT",           /* P30 */
          "\\INFB",           /* A2H D1 L2D L3D L3H L2E L5D L5C M1A M2E L4L W3V */
          "\\SSTE");          /* A3F A6F A3N A3L M6N W3N W6A */

ASUS_HANDLE(ls_switch, ASUS_HOTK_PREFIX "ALSC");      /* Z71A Z71V */
ASUS_HANDLE(ls_level, ASUS_HOTK_PREFIX "ALSL"); /* Z71A Z71V */

/* GPS */
/* R2H use different handle for GPS on/off */
ASUS_HANDLE(gps_on, ASUS_HOTK_PREFIX "SDON");   /* R2H */
ASUS_HANDLE(gps_off, ASUS_HOTK_PREFIX "SDOF");  /* R2H */
ASUS_HANDLE(gps_status, ASUS_HOTK_PREFIX "GPST");

/*
 * This is the main structure, we can use it to store anything interesting
 * about the hotk device
 */
struct asus_hotk {
      char *name;       //laptop name
      struct acpi_device *device;   //the device we are in
      acpi_handle handle;     //the handle of the hotk device
      char status;            //status of the hotk, for LEDs, ...
      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
};

/*
 * This header is made available to allow proper configuration given model,
 * revision number , ... this info cannot go in struct asus_hotk because it is
 * available before the hotk
 */
static struct acpi_table_header *asus_info;

/* The actual device the driver binds to */
static struct asus_hotk *hotk;

/*
 * The hotkey driver declaration
 */
static const struct acpi_device_id asus_device_ids[] = {
      {"ATK0100", 0},
      {"", 0},
};
MODULE_DEVICE_TABLE(acpi, asus_device_ids);

static int asus_hotk_add(struct acpi_device *device);
static int asus_hotk_remove(struct acpi_device *device, int type);
static struct acpi_driver asus_hotk_driver = {
      .name = ASUS_HOTK_NAME,
      .class = ASUS_HOTK_CLASS,
      .ids = asus_device_ids,
      .ops = {
            .add = asus_hotk_add,
            .remove = asus_hotk_remove,
            },
};

/* The backlight device /sys/class/backlight */
static struct backlight_device *asus_backlight_device;

/*
 * The backlight class declaration
 */
static int read_brightness(struct backlight_device *bd);
static int update_bl_status(struct backlight_device *bd);
static struct backlight_ops asusbl_ops = {
      .get_brightness = read_brightness,
      .update_status = update_bl_status,
};

/* These functions actually update the LED's, and 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. */
static struct workqueue_struct *led_workqueue;

#define ASUS_LED(object, ledname)                           \
      static void object##_led_set(struct led_classdev *led_cdev, \
                             enum led_brightness value);    \
      static void object##_led_update(struct work_struct *ignored);     \
      static int object##_led_wk;                           \
      static DECLARE_WORK(object##_led_work, object##_led_update);      \
      static struct led_classdev object##_led = {                 \
            .name           = "asus:" ledname,              \
            .brightness_set = object##_led_set,             \
      }

ASUS_LED(mled, "mail");
ASUS_LED(tled, "touchpad");
ASUS_LED(rled, "record");
ASUS_LED(pled, "phone");
ASUS_LED(gled, "gaming");

/*
 * 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 1 if write is successful, 0 else.
 */
static int write_acpi_int(acpi_handle handle, const char *method, int val,
                    struct acpi_buffer *output)
{
      struct acpi_object_list params;     //list of input parameters (an int here)
      union acpi_object in_obj;     //the only param we use
      acpi_status status;

      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);
      return (status == AE_OK);
}

static int read_wireless_status(int mask)
{
      ulong status;
      acpi_status rv = AE_OK;

      if (!wireless_status_handle)
            return (hotk->status & mask) ? 1 : 0;

      rv = acpi_evaluate_integer(wireless_status_handle, NULL, NULL, &status);
      if (ACPI_FAILURE(rv))
            printk(ASUS_WARNING "Error reading Wireless status\n");
      else
            return (status & mask) ? 1 : 0;

      return (hotk->status & mask) ? 1 : 0;
}

static int read_gps_status(void)
{
      ulong status;
      acpi_status rv = AE_OK;

      rv = acpi_evaluate_integer(gps_status_handle, NULL, NULL, &status);
      if (ACPI_FAILURE(rv))
            printk(ASUS_WARNING "Error reading GPS status\n");
      else
            return status ? 1 : 0;

      return (hotk->status & GPS_ON) ? 1 : 0;
}

/* Generic LED functions */
static int read_status(int mask)
{
      /* There is a special method for both wireless devices */
      if (mask == BT_ON || mask == WL_ON)
            return read_wireless_status(mask);
      else if (mask == GPS_ON)
            return read_gps_status();

      return (hotk->status & mask) ? 1 : 0;
}

static void write_status(acpi_handle handle, int out, int mask)
{
      hotk->status = (out) ? (hotk->status | mask) : (hotk->status & ~mask);

      switch (mask) {
      case MLED_ON:
            out = !out & 0x1;
            break;
      case GLED_ON:
            out = (out & 0x1) + 1;
            break;
      case GPS_ON:
            handle = (out) ? gps_on_handle : gps_off_handle;
            out = 0x02;
            break;
      default:
            out &= 0x1;
            break;
      }

      if (handle && !write_acpi_int(handle, NULL, out, NULL))
            printk(ASUS_WARNING " write failed %x\n", mask);
}

/* /sys/class/led handlers */
#define ASUS_LED_HANDLER(object, mask)                            \
      static void object##_led_set(struct led_classdev *led_cdev, \
                             enum led_brightness value)           \
      {                                               \
            object##_led_wk = value;                        \
            queue_work(led_workqueue, &object##_led_work);        \
      }                                               \
      static void object##_led_update(struct work_struct *ignored)      \
      {                                               \
            int value = object##_led_wk;                    \
            write_status(object##_set_handle, value, (mask));     \
      }

ASUS_LED_HANDLER(mled, MLED_ON);
ASUS_LED_HANDLER(pled, PLED_ON);
ASUS_LED_HANDLER(rled, RLED_ON);
ASUS_LED_HANDLER(tled, TLED_ON);
ASUS_LED_HANDLER(gled, GLED_ON);

static int get_lcd_state(void)
{
      return read_status(LCD_ON);
}

static int set_lcd_state(int value)
{
      int lcd = 0;
      acpi_status status = 0;

      lcd = value ? 1 : 0;

      if (lcd == get_lcd_state())
            return 0;

      if (lcd_switch_handle) {
            status = acpi_evaluate_object(lcd_switch_handle,
                                    NULL, NULL, NULL);

            if (ACPI_FAILURE(status))
                  printk(ASUS_WARNING "Error switching LCD\n");
      }

      write_status(NULL, lcd, LCD_ON);
      return 0;
}

static void lcd_blank(int blank)
{
      struct backlight_device *bd = asus_backlight_device;

      if (bd) {
            bd->props.power = blank;
            backlight_update_status(bd);
      }
}

static int read_brightness(struct backlight_device *bd)
{
      ulong value;
      acpi_status rv = AE_OK;

      rv = acpi_evaluate_integer(brightness_get_handle, NULL, NULL, &value);
      if (ACPI_FAILURE(rv))
            printk(ASUS_WARNING "Error reading brightness\n");

      return value;
}

static int set_brightness(struct backlight_device *bd, int value)
{
      int ret = 0;

      value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
      /* 0 <= value <= 15 */

      if (!write_acpi_int(brightness_set_handle, NULL, value, NULL)) {
            printk(ASUS_WARNING "Error changing brightness\n");
            ret = -EIO;
      }

      return ret;
}

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

      rv = set_brightness(bd, value);
      if (rv)
            return rv;

      value = (bd->props.power == FB_BLANK_UNBLANK) ? 1 : 0;
      return set_lcd_state(value);
}

/*
 * 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)
{
      int len = 0;
      ulong 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_HOTK_NAME " " ASUS_LAPTOP_VERSION "\n");
      len += sprintf(page + len, "Model reference    : %s\n", hotk->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(hotk->handle, "SFUN", NULL, &temp);
      if (!ACPI_FAILURE(rv))
            len += sprintf(page + len, "SFUN value         : 0x%04x\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(hotk->handle, "ASYM", NULL, &temp);
      if (!ACPI_FAILURE(rv))
            len += sprintf(page + len, "ASYM value         : 0x%04x\n",
                         (uint) temp);
      if (asus_info) {
            snprintf(buf, 16, "%d", asus_info->length);
            len += sprintf(page + len, "DSDT length        : %s\n", buf);
            snprintf(buf, 16, "%d", asus_info->checksum);
            len += sprintf(page + len, "DSDT checksum      : %s\n", buf);
            snprintf(buf, 16, "%d", asus_info->revision);
            len += sprintf(page + len, "DSDT revision      : %s\n", buf);
            snprintf(buf, 7, "%s", asus_info->oem_id);
            len += sprintf(page + len, "OEM id             : %s\n", buf);
            snprintf(buf, 9, "%s", asus_info->oem_table_id);
            len += sprintf(page + len, "OEM table id       : %s\n", buf);
            snprintf(buf, 16, "%x", asus_info->oem_revision);
            len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);
            snprintf(buf, 5, "%s", asus_info->asl_compiler_id);
            len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
            snprintf(buf, 16, "%x", asus_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 store_status(const char *buf, size_t count,
                      acpi_handle handle, int mask)
{
      int rv, value;
      int out = 0;

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

      write_status(handle, out, mask);

      return rv;
}

/*
 * LEDD display
 */
static ssize_t show_ledd(struct device *dev,
                   struct device_attribute *attr, char *buf)
{
      return sprintf(buf, "0x%08x\n", hotk->ledd_status);
}

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

      rv = parse_arg(buf, count, &value);
      if (rv > 0) {
            if (!write_acpi_int(ledd_set_handle, NULL, value, NULL))
                  printk(ASUS_WARNING "LED display write failed\n");
            else
                  hotk->ledd_status = (u32) value;
      }
      return rv;
}

/*
 * WLAN
 */
static ssize_t show_wlan(struct device *dev,
                   struct device_attribute *attr, char *buf)
{
      return sprintf(buf, "%d\n", read_status(WL_ON));
}

static ssize_t store_wlan(struct device *dev, struct device_attribute *attr,
                    const char *buf, size_t count)
{
      return store_status(buf, count, wl_switch_handle, WL_ON);
}

/*
 * Bluetooth
 */
static ssize_t show_bluetooth(struct device *dev,
                        struct device_attribute *attr, char *buf)
{
      return sprintf(buf, "%d\n", read_status(BT_ON));
}

static ssize_t store_bluetooth(struct device *dev,
                         struct device_attribute *attr, const char *buf,
                         size_t count)
{
      return store_status(buf, count, bt_switch_handle, BT_ON);
}

/*
 * Display
 */
static void set_display(int value)
{
      /* no sanity check needed for now */
      if (!write_acpi_int(display_set_handle, NULL, value, NULL))
            printk(ASUS_WARNING "Error setting display\n");
      return;
}

static int read_display(void)
{
      ulong value = 0;
      acpi_status rv = AE_OK;

      /* In most of the case, we know how to set the display, but sometime
         we can't read it */
      if (display_get_handle) {
            rv = acpi_evaluate_integer(display_get_handle, NULL,
                                 NULL, &value);
            if (ACPI_FAILURE(rv))
                  printk(ASUS_WARNING "Error reading display status\n");
      }

      value &= 0x0F;          /* needed for some models, shouldn't hurt others */

      return value;
}

/*
 * Now, *this* one could be more user-friendly, but so far, no-one has
 * complained. The significance of bits is the same as in store_disp()
 */
static ssize_t show_disp(struct device *dev,
                   struct device_attribute *attr, char *buf)
{
      return sprintf(buf, "%d\n", read_display());
}

/*
 * 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)
{
      int rv, value;

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

/*
 * Light Sens
 */
static void set_light_sens_switch(int value)
{
      if (!write_acpi_int(ls_switch_handle, NULL, value, NULL))
            printk(ASUS_WARNING "Error setting light sensor switch\n");
      hotk->light_switch = value;
}

static ssize_t show_lssw(struct device *dev,
                   struct device_attribute *attr, char *buf)
{
      return sprintf(buf, "%d\n", hotk->light_switch);
}

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

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

      return rv;
}

static void set_light_sens_level(int value)
{
      if (!write_acpi_int(ls_level_handle, NULL, value, NULL))
            printk(ASUS_WARNING "Error setting light sensor level\n");
      hotk->light_level = value;
}

static ssize_t show_lslvl(struct device *dev,
                    struct device_attribute *attr, char *buf)
{
      return sprintf(buf, "%d\n", hotk->light_level);
}

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

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

      return rv;
}

/*
 * GPS
 */
static ssize_t show_gps(struct device *dev,
                  struct device_attribute *attr, char *buf)
{
      return sprintf(buf, "%d\n", read_status(GPS_ON));
}

static ssize_t store_gps(struct device *dev, struct device_attribute *attr,
                   const char *buf, size_t count)
{
      return store_status(buf, count, NULL, GPS_ON);
}

static void asus_hotk_notify(acpi_handle handle, u32 event, void *data)
{
      /* TODO Find a better way to handle events count. */
      if (!hotk)
            return;

      /*
       * We need to tell the backlight device when the backlight power is
       * switched
       */
      if (event == ATKD_LCD_ON) {
            write_status(NULL, 1, LCD_ON);
            lcd_blank(FB_BLANK_UNBLANK);
      } else if (event == ATKD_LCD_OFF) {
            write_status(NULL, 0, LCD_ON);
            lcd_blank(FB_BLANK_POWERDOWN);
      }

      acpi_bus_generate_proc_event(hotk->device, event,
                        hotk->event_count[event % 128]++);

      return;
}

#define ASUS_CREATE_DEVICE_ATTR(_name)                            \
      struct device_attribute dev_attr_##_name = {                \
            .attr = {                                 \
                  .name = __stringify(_name),               \
                  .mode = 0 },                              \
            .show   = NULL,                                 \
            .store  = NULL,                                 \
      }

#define ASUS_SET_DEVICE_ATTR(_name, _mode, _show, _store)         \
      do {                                            \
            dev_attr_##_name.attr.mode = _mode;             \
            dev_attr_##_name.show = _show;                        \
            dev_attr_##_name.store = _store;                \
      } while(0)

static ASUS_CREATE_DEVICE_ATTR(infos);
static ASUS_CREATE_DEVICE_ATTR(wlan);
static ASUS_CREATE_DEVICE_ATTR(bluetooth);
static ASUS_CREATE_DEVICE_ATTR(display);
static ASUS_CREATE_DEVICE_ATTR(ledd);
static ASUS_CREATE_DEVICE_ATTR(ls_switch);
static ASUS_CREATE_DEVICE_ATTR(ls_level);
static ASUS_CREATE_DEVICE_ATTR(gps);

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

static struct attribute_group asuspf_attribute_group = {
      .attrs = asuspf_attributes
};

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

static struct platform_device *asuspf_device;

static void asus_hotk_add_fs(void)
{
      ASUS_SET_DEVICE_ATTR(infos, 0444, show_infos, NULL);

      if (wl_switch_handle)
            ASUS_SET_DEVICE_ATTR(wlan, 0644, show_wlan, store_wlan);

      if (bt_switch_handle)
            ASUS_SET_DEVICE_ATTR(bluetooth, 0644,
                             show_bluetooth, store_bluetooth);

      if (display_set_handle && display_get_handle)
            ASUS_SET_DEVICE_ATTR(display, 0644, show_disp, store_disp);
      else if (display_set_handle)
            ASUS_SET_DEVICE_ATTR(display, 0200, NULL, store_disp);

      if (ledd_set_handle)
            ASUS_SET_DEVICE_ATTR(ledd, 0644, show_ledd, store_ledd);

      if (ls_switch_handle && ls_level_handle) {
            ASUS_SET_DEVICE_ATTR(ls_level, 0644, show_lslvl, store_lslvl);
            ASUS_SET_DEVICE_ATTR(ls_switch, 0644, show_lssw, store_lssw);
      }

      if (gps_status_handle && gps_on_handle && gps_off_handle)
            ASUS_SET_DEVICE_ATTR(gps, 0644, show_gps, store_gps);
}

static int asus_handle_init(char *name, acpi_handle * handle,
                      char **paths, int num_paths)
{
      int i;
      acpi_status status;

      for (i = 0; i < num_paths; i++) {
            status = acpi_get_handle(NULL, paths[i], handle);
            if (ACPI_SUCCESS(status))
                  return 0;
      }

      *handle = NULL;
      return -ENODEV;
}

#define ASUS_HANDLE_INIT(object)                            \
      asus_handle_init(#object, &object##_handle, object##_paths, \
                   ARRAY_SIZE(object##_paths))

/*
 * This function is used to initialize the hotk with right values. In this
 * method, we can make all the detection we want, and modify the hotk struct
 */
static int asus_hotk_get_info(void)
{
      struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
      union acpi_object *model = NULL;
      ulong 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. A global variable asus_info contains
       * the DSDT header.
       */
      status = acpi_get_table(ACPI_SIG_DSDT, 1, &asus_info);
      if (ACPI_FAILURE(status))
            printk(ASUS_WARNING "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(hotk->handle, "INIT", 0, &buffer)) {
            printk(ASUS_ERR "Hotkey initialization failed\n");
            return -ENODEV;
      }

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

      /* This too ... */
      write_acpi_int(hotk->handle, "CWAP", wapf, NULL);

      /*
       * 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;
            }
      }
      hotk->name = kstrdup(string, GFP_KERNEL);
      if (!hotk->name)
            return -ENOMEM;

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

      ASUS_HANDLE_INIT(mled_set);
      ASUS_HANDLE_INIT(tled_set);
      ASUS_HANDLE_INIT(rled_set);
      ASUS_HANDLE_INIT(pled_set);
      ASUS_HANDLE_INIT(gled_set);

      ASUS_HANDLE_INIT(ledd_set);

      /*
       * 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.
       */
      status =
          acpi_evaluate_integer(hotk->handle, "HRWS", NULL, &hwrs_result);
      if (ACPI_FAILURE(status))
            hwrs_result = WL_HWRS | BT_HWRS;

      if (hwrs_result & WL_HWRS)
            ASUS_HANDLE_INIT(wl_switch);
      if (hwrs_result & BT_HWRS)
            ASUS_HANDLE_INIT(bt_switch);

      ASUS_HANDLE_INIT(wireless_status);

      ASUS_HANDLE_INIT(brightness_set);
      ASUS_HANDLE_INIT(brightness_get);

      ASUS_HANDLE_INIT(lcd_switch);

      ASUS_HANDLE_INIT(display_set);
      ASUS_HANDLE_INIT(display_get);

      /* There is a lot of models with "ALSL", but a few get
         a real light sens, so we need to check it. */
      if (!ASUS_HANDLE_INIT(ls_switch))
            ASUS_HANDLE_INIT(ls_level);

      ASUS_HANDLE_INIT(gps_on);
      ASUS_HANDLE_INIT(gps_off);
      ASUS_HANDLE_INIT(gps_status);

      kfree(model);

      return AE_OK;
}

static int asus_hotk_check(void)
{
      int result = 0;

      result = acpi_bus_get_status(hotk->device);
      if (result)
            return result;

      if (hotk->device->status.present) {
            result = asus_hotk_get_info();
      } else {
            printk(ASUS_ERR "Hotkey device not present, aborting\n");
            return -EINVAL;
      }

      return result;
}

static int asus_hotk_found;

static int asus_hotk_add(struct acpi_device *device)
{
      acpi_status status = AE_OK;
      int result;

      if (!device)
            return -EINVAL;

      printk(ASUS_NOTICE "Asus Laptop Support version %s\n",
             ASUS_LAPTOP_VERSION);

      hotk = kzalloc(sizeof(struct asus_hotk), GFP_KERNEL);
      if (!hotk)
            return -ENOMEM;

      hotk->handle = device->handle;
      strcpy(acpi_device_name(device), ASUS_HOTK_DEVICE_NAME);
      strcpy(acpi_device_class(device), ASUS_HOTK_CLASS);
      acpi_driver_data(device) = hotk;
      hotk->device = device;

      result = asus_hotk_check();
      if (result)
            goto end;

      asus_hotk_add_fs();

      /*
       * We install the handler, it will receive the hotk in parameter, so, we
       * could add other data to the hotk struct
       */
      status = acpi_install_notify_handler(hotk->handle, ACPI_ALL_NOTIFY,
                                   asus_hotk_notify, hotk);
      if (ACPI_FAILURE(status))
            printk(ASUS_ERR "Error installing notify handler\n");

      asus_hotk_found = 1;

      /* WLED and BLED are on by default */
      write_status(bt_switch_handle, 1, BT_ON);
      write_status(wl_switch_handle, 1, WL_ON);

      /* If the h/w switch is off, we need to check the real status */
      write_status(NULL, read_status(BT_ON), BT_ON);
      write_status(NULL, read_status(WL_ON), WL_ON);

      /* LCD Backlight is on by default */
      write_status(NULL, 1, LCD_ON);

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

      /* Set initial values of light sensor and level */
      hotk->light_switch = 1; /* Default to light sensor disabled */
      hotk->light_level = 0;  /* level 5 for sensor sensitivity */

      if (ls_switch_handle)
            set_light_sens_switch(hotk->light_switch);

      if (ls_level_handle)
            set_light_sens_level(hotk->light_level);

      /* GPS is on by default */
      write_status(NULL, 1, GPS_ON);

      end:
      if (result) {
            kfree(hotk->name);
            kfree(hotk);
      }

      return result;
}

static int asus_hotk_remove(struct acpi_device *device, int type)
{
      acpi_status status = 0;

      if (!device || !acpi_driver_data(device))
            return -EINVAL;

      status = acpi_remove_notify_handler(hotk->handle, ACPI_ALL_NOTIFY,
                                  asus_hotk_notify);
      if (ACPI_FAILURE(status))
            printk(ASUS_ERR "Error removing notify handler\n");

      kfree(hotk->name);
      kfree(hotk);

      return 0;
}

static void asus_backlight_exit(void)
{
      if (asus_backlight_device)
            backlight_device_unregister(asus_backlight_device);
}

#define  ASUS_LED_UNREGISTER(object)                        \
      if (object##_led.dev)                           \
            led_classdev_unregister(&object##_led)

static void asus_led_exit(void)
{
      destroy_workqueue(led_workqueue);
      ASUS_LED_UNREGISTER(mled);
      ASUS_LED_UNREGISTER(tled);
      ASUS_LED_UNREGISTER(pled);
      ASUS_LED_UNREGISTER(rled);
      ASUS_LED_UNREGISTER(gled);
}

static void __exit asus_laptop_exit(void)
{
      asus_backlight_exit();
      asus_led_exit();

      acpi_bus_unregister_driver(&asus_hotk_driver);
      sysfs_remove_group(&asuspf_device->dev.kobj, &asuspf_attribute_group);
      platform_device_unregister(asuspf_device);
      platform_driver_unregister(&asuspf_driver);
}

static int asus_backlight_init(struct device *dev)
{
      struct backlight_device *bd;

      if (brightness_set_handle && lcd_switch_handle) {
            bd = backlight_device_register(ASUS_HOTK_FILE, dev,
                                     NULL, &asusbl_ops);
            if (IS_ERR(bd)) {
                  printk(ASUS_ERR
                         "Could not register asus backlight device\n");
                  asus_backlight_device = NULL;
                  return PTR_ERR(bd);
            }

            asus_backlight_device = bd;

            bd->props.max_brightness = 15;
            bd->props.brightness = read_brightness(NULL);
            bd->props.power = FB_BLANK_UNBLANK;
            backlight_update_status(bd);
      }
      return 0;
}

static int asus_led_register(acpi_handle handle,
                       struct led_classdev *ldev, struct device *dev)
{
      if (!handle)
            return 0;

      return led_classdev_register(dev, ldev);
}

#define ASUS_LED_REGISTER(object, device)                   \
      asus_led_register(object##_set_handle, &object##_led, device)

static int asus_led_init(struct device *dev)
{
      int rv;

      rv = ASUS_LED_REGISTER(mled, dev);
      if (rv)
            goto out;

      rv = ASUS_LED_REGISTER(tled, dev);
      if (rv)
            goto out1;

      rv = ASUS_LED_REGISTER(rled, dev);
      if (rv)
            goto out2;

      rv = ASUS_LED_REGISTER(pled, dev);
      if (rv)
            goto out3;

      rv = ASUS_LED_REGISTER(gled, dev);
      if (rv)
            goto out4;

      led_workqueue = create_singlethread_workqueue("led_workqueue");
      if (!led_workqueue)
            goto out5;

      return 0;
out5:
      rv = -ENOMEM;
      ASUS_LED_UNREGISTER(gled);
out4:
      ASUS_LED_UNREGISTER(pled);
out3:
      ASUS_LED_UNREGISTER(rled);
out2:
      ASUS_LED_UNREGISTER(tled);
out1:
      ASUS_LED_UNREGISTER(mled);
out:
      return rv;
}

static int __init asus_laptop_init(void)
{
      struct device *dev;
      int result;

      if (acpi_disabled)
            return -ENODEV;

      result = acpi_bus_register_driver(&asus_hotk_driver);
      if (result < 0)
            return result;

      /*
       * This is a bit of a kludge.  We only want this module loaded
       * for ASUS systems, but there's currently no way to probe the
       * ACPI namespace for ASUS HIDs.  So we just return failure if
       * we didn't find one, which will cause the module to be
       * unloaded.
       */
      if (!asus_hotk_found) {
            acpi_bus_unregister_driver(&asus_hotk_driver);
            return -ENODEV;
      }

      dev = acpi_get_physical_device(hotk->device->handle);

      result = asus_backlight_init(dev);
      if (result)
            goto fail_backlight;

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

      /* Register platform stuff */
      result = platform_driver_register(&asuspf_driver);
      if (result)
            goto fail_platform_driver;

      asuspf_device = platform_device_alloc(ASUS_HOTK_FILE, -1);
      if (!asuspf_device) {
            result = -ENOMEM;
            goto fail_platform_device1;
      }

      result = platform_device_add(asuspf_device);
      if (result)
            goto fail_platform_device2;

      result = sysfs_create_group(&asuspf_device->dev.kobj,
                            &asuspf_attribute_group);
      if (result)
            goto fail_sysfs;

      return 0;

      fail_sysfs:
      platform_device_del(asuspf_device);

      fail_platform_device2:
      platform_device_put(asuspf_device);

      fail_platform_device1:
      platform_driver_unregister(&asuspf_driver);

      fail_platform_driver:
      asus_led_exit();

      fail_led:
      asus_backlight_exit();

      fail_backlight:

      return result;
}

module_init(asus_laptop_init);
module_exit(asus_laptop_exit);

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