text: /*
   *  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 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 */
  
  /* 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_pega_rfkill {
  	int control_id;		/* type of control. Maps to PEGA_* values */
  	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 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 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 rfkill *gps_rfkill;
  
  	struct asus_pega_rfkill wlanrfk;
  	struct asus_pega_rfkill btrfk;
  	struct asus_pega_rfkill wwanrfk;
  
  	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, 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, 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->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;
  
  	/*
  	 * 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;
  
  	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, "HRWS", NULL, &temp);
  	if (!ACPI_FAILURE(rv))
  		len += sprintf(page + len, "HRWS 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);
  }
  
  /*
   * 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 void asus_rfkill_exit(struct asus_laptop *asus)
  {
  	if (asus->gps_rfkill) {
  		rfkill_unregister(asus->gps_rfkill);
  		rfkill_destroy(asus->gps_rfkill);
  		asus->gps_rfkill = NULL;
  	}
  }
  
  static int asus_rfkill_init(struct asus_laptop *asus)
  {
  	int result;
  
  	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))
  		return 0;
  
  	asus->gps_rfkill = rfkill_alloc("asus-gps", &asus->platform_device->dev,
  					RFKILL_TYPE_GPS,
  					&asus_gps_rfkill_ops, asus);
  	if (!asus->gps_rfkill)
  		return -EINVAL;
  
  	result = rfkill_register(asus->gps_rfkill);
  	if (result) {
  		rfkill_destroy(asus->gps_rfkill);
  		asus->gps_rfkill = NULL;
  	}
  
  	return result;
  }
  
  static int pega_rfkill_set(void *data, bool blocked)
  {
  	struct asus_pega_rfkill *pega_rfk = data;
  
  	int ret = asus_pega_lucid_set(pega_rfk->asus, pega_rfk->control_id, !blocked);
  	pr_warn("Setting rfkill %d, to %d; returned %d\n", pega_rfk->control_id, !blocked, ret);
  
  	return ret;
  }
  
  static const struct rfkill_ops pega_rfkill_ops = {
  	.set_block = pega_rfkill_set,
  };
  
  static void pega_rfkill_terminate(struct asus_pega_rfkill *pega_rfk)
  {
  	pr_warn("Terminating %d\n", pega_rfk->control_id);
  	if (pega_rfk->rfkill) {
  		rfkill_unregister(pega_rfk->rfkill);
  		rfkill_destroy(pega_rfk->rfkill);
  		pega_rfk->rfkill = NULL;
  	}
  }
  
  static void pega_rfkill_exit(struct asus_laptop *asus)
  {
  	pega_rfkill_terminate(&asus->wwanrfk);
  	pega_rfkill_terminate(&asus->btrfk);
  	pega_rfkill_terminate(&asus->wlanrfk);
  }
  
  static int pega_rfkill_setup(struct asus_laptop *asus, struct asus_pega_rfkill *pega_rfk,
  		const char *name, int controlid, int rfkill_type)
  {
  	int result;
  
  	pr_warn("Setting up rfk %s, control %d, type %d\n", name, controlid, rfkill_type);
  	pega_rfk->control_id = controlid;
  	pega_rfk->asus = asus;
  	pega_rfk->rfkill = rfkill_alloc(name, &asus->platform_device->dev,
  					rfkill_type, &pega_rfkill_ops, pega_rfk);
  	if (!pega_rfk->rfkill)
  		return -EINVAL;
  
  	result = rfkill_register(pega_rfk->rfkill);
  	if (result) {
  		rfkill_destroy(pega_rfk->rfkill);
  		pega_rfk->rfkill = NULL;
  	}
  
  	return result;
  }
  
  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->wlanrfk, "pega-wlan", PEGA_WLAN, RFKILL_TYPE_WLAN);
  	if(ret)
  		return ret;
  	ret = pega_rfkill_setup(asus, &asus->btrfk, "pega-bt", PEGA_BLUETOOTH, RFKILL_TYPE_BLUETOOTH);
  	if(ret)
  		goto err_btrfk;
  	ret = pega_rfkill_setup(asus, &asus->wwanrfk, "pega-wwan", PEGA_WWAN, RFKILL_TYPE_WWAN);
  	if(ret)
  		goto err_wwanrfk;
  
  	pr_warn("Pega rfkill init succeeded\n");
  	return 0;
  err_wwanrfk:
  	pega_rfkill_terminate(&asus->btrfk);
  err_btrfk:
  	pega_rfkill_terminate(&asus->wlanrfk);
  
  	return ret;
  }
  
  /*
   * Input device (i.e. hotkeys)
   */
  static void asus_input_notify(struct asus_laptop *asus, int event)
  {
  	if (asus->inputdev)
  		sparse_keymap_report_event(asus->inputdev, event, 1, true);
  }
  
  static int asus_input_init(struct asus_laptop *asus)
  {
  	struct input_dev *input;
  	int error;
  
  	input = input_allocate_device();
  	if (!input) {
  		pr_info("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_info("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, "HRWS", NULL, &hwrs_result);
  	if (!ACPI_FAILURE(status))
  		pr_notice("  HRWS 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;
  
  	/* WLED and BLED are on by default */
  	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)
  		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);
  	pega_rfkill_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);
  