Pull asus into test branch

4 files changed, 1198 insertions, 5 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 5c087a5bddf8..2ac2922be1bf 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -207,19 +207,22 @@ config ACPI_ASUS
 
 	  Note: display switching code is currently considered EXPERIMENTAL,
 	  toying with these values may even lock your machine.
-          
+
           All settings are changed via /proc/acpi/asus directory entries. Owner
           and group for these entries can be set with asus_uid and asus_gid
           parameters.
-          
+
           More information and a userspace daemon for handling the extra buttons
           at <http://sourceforge.net/projects/acpi4asus/>.
-          
+
           If you have an ACPI-compatible ASUS laptop, say Y or M here. This
           driver is still under development, so if your laptop is unsupported or
           something works not quite as expected, please use the mailing list
-          available on the above page (acpi4asus-user@lists.sourceforge.net)
-          
+          available on the above page (acpi4asus-user@lists.sourceforge.net).
+
+	  NOTE: This driver is deprecated and will probably be removed soon,
+	  use asus-laptop instead.
+
 config ACPI_IBM
 	tristate "IBM ThinkPad Laptop Extras"
 	depends on X86
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 00db31c314e0..89bba277da5f 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -69,6 +69,25 @@ config TIFM_7XX1
           To compile this driver as a module, choose M here: the module will
 	  be called tifm_7xx1.
 
+config ASUS_LAPTOP
+        tristate "Asus Laptop Extras (EXPERIMENTAL)"
+        depends on X86
+        depends on ACPI
+	depends on EXPERIMENTAL && !ACPI_ASUS
+	depends on LEDS_CLASS
+	depends on BACKLIGHT_CLASS_DEVICE
+        ---help---
+	  This is the new Linux driver for Asus laptops. It may also support some
+	  MEDION, JVC or VICTOR laptops. It makes all the extra buttons generate
+	  standard ACPI events that go through /proc/acpi/events. It also adds
+	  support for video output switching, LCD backlight control, Bluetooth and
+	  Wlan control, and most importantly, allows you to blink those fancy LEDs.
+
+	  For more information and a userspace daemon for handling the extra
+	  buttons see <http://acpi4asus.sf.net/>.
+
+	  If you have an ACPI-compatible ASUS laptop, say Y or M here.
+
 config MSI_LAPTOP
         tristate "MSI Laptop Extras"
         depends on X86
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index c9e98ab021c5..35da53c409c0 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -6,6 +6,7 @@ obj- := misc.o	# Dummy rule to force built-in.o to be made
 obj-$(CONFIG_IBM_ASM)		+= ibmasm/
 obj-$(CONFIG_HDPU_FEATURES)	+= hdpuftrs/
 obj-$(CONFIG_MSI_LAPTOP)     += msi-laptop.o
+obj-$(CONFIG_ASUS_LAPTOP)     += asus-laptop.o
 obj-$(CONFIG_LKDTM)		+= lkdtm.o
 obj-$(CONFIG_TIFM_CORE)       	+= tifm_core.o
 obj-$(CONFIG_TIFM_7XX1)       	+= tifm_7xx1.o
diff --git a/drivers/misc/asus-laptop.c b/drivers/misc/asus-laptop.c
new file mode 100644
index 000000000000..b6243506add8
--- /dev/null
+++ b/drivers/misc/asus-laptop.c
@@ -0,0 +1,1170 @@
+/*
+ *  asus-laptop.c - Asus Laptop Support
+ *
+ *
+ *  Copyright (C) 2002-2005 Julien Lerouge, 2003-2006 Karol Kozimor
+ *  Copyright (C) 2006 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
+ *
+ */
+
+#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 "0.40"
+
+#define ASUS_HOTK_NAME          "Asus Laptop Support"
+#define ASUS_HOTK_CLASS         "hotkey"
+#define ASUS_HOTK_DEVICE_NAME   "Hotkey"
+#define ASUS_HOTK_HID           "ATK0100"
+#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 LCD_ON      0x40	//LCD backlight
+
+#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");
+
+#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 */
+
+/* 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 */
+	    "\\_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 */
+
+/*
+ * 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 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_HOTK_HID,
+	.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_properties asusbl_data = {
+	.owner = THIS_MODULE,
+	.get_brightness = read_brightness,
+	.update_status = update_bl_status,
+	.max_brightness = 15,
+};
+
+/* 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;					\
+	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");
+
+/*
+ * 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_acpi_int(acpi_handle handle, const char *method, int *val,
+			 struct acpi_object_list *params)
+{
+	struct acpi_buffer output;
+	union acpi_object out_obj;
+	acpi_status status;
+
+	output.length = sizeof(out_obj);
+	output.pointer = &out_obj;
+
+	status = acpi_evaluate_object(handle, (char *)method, params, &output);
+	*val = out_obj.integer.value;
+	return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
+}
+
+static int read_wireless_status(int mask)
+{
+	int status;
+
+	if (!wireless_status_handle)
+		return (hotk->status & mask) ? 1 : 0;
+
+	if (read_acpi_int(wireless_status_handle, NULL, &status, NULL)) {
+		return (status & mask) ? 1 : 0;
+	} else
+		printk(ASUS_WARNING "Error reading Wireless status\n");
+
+	return (hotk->status & mask) ? 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);
+
+	return (hotk->status & mask) ? 1 : 0;
+}
+
+static void write_status(acpi_handle handle, int out, int mask, int invert)
+{
+	hotk->status = (out) ? (hotk->status | mask) : (hotk->status & ~mask);
+
+	if (invert)		/* invert target value */
+		out = !out & 0x1;
+
+	if (handle && !write_acpi_int(handle, NULL, out, NULL))
+		printk(ASUS_WARNING " write failed\n");
+}
+
+/* /sys/class/led handlers */
+#define ASUS_LED_HANDLER(object, mask, invert)				\
+	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), (invert)); \
+	}
+
+ASUS_LED_HANDLER(mled, MLED_ON, 1);
+ASUS_LED_HANDLER(pled, PLED_ON, 0);
+ASUS_LED_HANDLER(rled, RLED_ON, 0);
+ASUS_LED_HANDLER(tled, TLED_ON, 0);
+
+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, 0);
+	return 0;
+}
+
+static void lcd_blank(int blank)
+{
+	struct backlight_device *bd = asus_backlight_device;
+
+	if (bd) {
+		down(&bd->sem);
+		if (likely(bd->props)) {
+			bd->props->power = blank;
+			if (likely(bd->props->update_status))
+				bd->props->update_status(bd);
+		}
+		up(&bd->sem);
+	}
+}
+
+static int read_brightness(struct backlight_device *bd)
+{
+	int value;
+
+	if (!read_acpi_int(brightness_get_handle, NULL, &value, NULL))
+		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;
+	int temp;
+	char buf[16];		//enough for all info
+	/*
+	 * 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.
+	 */
+	if (read_acpi_int(hotk->handle, "SFUN", &temp, NULL))
+		len +=
+		    sprintf(page + len, "SFUN value         : 0x%04x\n", 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.
+	 */
+	if (read_acpi_int(hotk->handle, "ASYM", &temp, NULL))
+		len +=
+		    sprintf(page + len, "ASYM value         : 0x%04x\n", 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 invert)
+{
+	int rv, value;
+	int out = 0;
+
+	rv = parse_arg(buf, count, &value);
+	if (rv > 0)
+		out = value ? 1 : 0;
+
+	write_status(handle, out, mask, invert);
+
+	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, 0);
+}
+
+/*
+ * 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, 0);
+}
+
+/*
+ * 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)
+{
+	int value = 0;
+
+	/* In most of the case, we know how to set the display, but sometime
+	   we can't read it */
+	if (display_get_handle) {
+		if (!read_acpi_int(display_get_handle, NULL, &value, NULL))
+			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;
+}
+
+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, 0);
+		lcd_blank(FB_BLANK_UNBLANK);
+	} else if (event == ATKD_LCD_OFF) {
+		write_status(NULL, 0, LCD_ON, 0);
+		lcd_blank(FB_BLANK_POWERDOWN);
+	}
+
+	acpi_bus_generate_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,					\
+			.owner = THIS_MODULE },				\
+		.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 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,
+	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);
+	}
+}
+
+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 };
+	struct acpi_buffer dsdt = { ACPI_ALLOCATE_BUFFER, NULL };
+	union acpi_object *model = NULL;
+	int 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_TABLE_ID_DSDT, 1, &dsdt);
+	if (ACPI_FAILURE(status))
+		printk(ASUS_WARNING "Couldn't get the DSDT table header\n");
+	else
+		asus_info = dsdt.pointer;
+
+	/* 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 */
+	if (!read_acpi_int(hotk->handle, "BSTS", &bsts_result, NULL))
+		printk(ASUS_WARNING "Error calling BSTS\n");
+	else if (bsts_result)
+		printk(ASUS_NOTICE "BSTS called, 0x%02x returned\n",
+		       bsts_result);
+
+	/*
+	 * 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(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.
+	 */
+	if (!read_acpi_int(hotk->handle, "HRWS", &hwrs_result, NULL))
+		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);
+
+	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 = kmalloc(sizeof(struct asus_hotk), GFP_KERNEL);
+	if (!hotk)
+		return -ENOMEM;
+	memset(hotk, 0, sizeof(struct asus_hotk));
+
+	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_SYSTEM_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, 0);
+	write_status(wl_switch_handle, 1, WL_ON, 0);
+
+	/* LCD Backlight is on by default */
+	write_status(NULL, 1, LCD_ON, 0);
+
+	/* 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);
+
+      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_SYSTEM_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.class_dev				\
+	   && !IS_ERR(object##_led.class_dev))			\
+		led_classdev_unregister(&object##_led)
+
+static void asus_led_exit(void)
+{
+	ASUS_LED_UNREGISTER(mled);
+	ASUS_LED_UNREGISTER(tled);
+	ASUS_LED_UNREGISTER(pled);
+	ASUS_LED_UNREGISTER(rled);
+
+	destroy_workqueue(led_workqueue);
+}
+
+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);
+
+	kfree(asus_info);
+}
+
+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_data);
+		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;
+
+		down(&bd->sem);
+		if (likely(bd->props)) {
+			bd->props->brightness = read_brightness(NULL);
+			bd->props->power = FB_BLANK_UNBLANK;
+			if (likely(bd->props->update_status))
+				bd->props->update_status(bd);
+		}
+		up(&bd->sem);
+	}
+	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)
+		return rv;
+
+	rv = ASUS_LED_REGISTER(tled, dev);
+	if (rv)
+		return rv;
+
+	rv = ASUS_LED_REGISTER(rled, dev);
+	if (rv)
+		return rv;
+
+	rv = ASUS_LED_REGISTER(pled, dev);
+	if (rv)
+		return rv;
+
+	led_workqueue = create_singlethread_workqueue("led_workqueue");
+	if (!led_workqueue)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static int __init asus_laptop_init(void)
+{
+	struct device *dev;
+	int result;
+
+	if (acpi_disabled)
+		return -ENODEV;
+
+	if (!acpi_specific_hotkey_enabled) {
+		printk(ASUS_ERR "Using generic hotkey driver\n");
+		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);