Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1236 insertions, 0 deletions

diff --git a/drivers/acpi/asus_acpi.c b/drivers/acpi/asus_acpi.c
new file mode 100644
index 000000000000..a75cb565caeb
--- /dev/null
+++ b/drivers/acpi/asus_acpi.c
@@ -0,0 +1,1236 @@
+/*
+ *  asus_acpi.c - Asus Laptop ACPI Extras
+ *
+ *
+ *  Copyright (C) 2002, 2003, 2004 Julien Lerouge, Karol Kozimor
+ *
+ *  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.
+ *
+ *  TODO:
+ *  add Fn key status
+ *  Add mode selection on module loading (parameter) -> still necessary?
+ *  Complete display switching -- may require dirty hacks or calling _DOS?
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/proc_fs.h>
+#include <acpi/acpi_drivers.h>
+#include <acpi/acpi_bus.h>
+#include <asm/uaccess.h>
+
+#define ASUS_ACPI_VERSION "0.29"
+
+#define PROC_ASUS       "asus"	//the directory
+#define PROC_MLED       "mled"
+#define PROC_WLED       "wled"
+#define PROC_TLED       "tled"
+#define PROC_INFO       "info"
+#define PROC_LCD        "lcd"
+#define PROC_BRN        "brn"
+#define PROC_DISP       "disp"
+
+#define ACPI_HOTK_NAME          "Asus Laptop ACPI Extras Driver"
+#define ACPI_HOTK_CLASS         "hotkey"
+#define ACPI_HOTK_DEVICE_NAME   "Hotkey"
+#define ACPI_HOTK_HID           "ATK0100"
+
+/*
+ * Some events we use, same for all Asus
+ */
+#define BR_UP       0x10      		
+#define BR_DOWN     0x20
+
+/*
+ * Flags for hotk status
+ */
+#define MLED_ON     0x01	//is MLED ON ?
+#define WLED_ON     0x02
+#define TLED_ON     0x04
+
+MODULE_AUTHOR("Julien Lerouge, Karol Kozimor");
+MODULE_DESCRIPTION(ACPI_HOTK_NAME);
+MODULE_LICENSE("GPL");
+
+
+static uid_t asus_uid;
+static gid_t asus_gid;
+module_param(asus_uid, uint, 0);
+MODULE_PARM_DESC(uid, "UID for entries in /proc/acpi/asus.\n");
+module_param(asus_gid, uint, 0);
+MODULE_PARM_DESC(gid, "GID for entries in /proc/acpi/asus.\n");
+
+
+/* For each model, all features implemented, 
+ * those marked with R are relative to HOTK, A for absolute */
+struct model_data {
+	char *name;              //name of the laptop________________A
+	char *mt_mled;           //method to handle mled_____________R
+	char *mled_status;       //node to handle mled reading_______A
+	char *mt_wled;           //method to handle wled_____________R
+	char *wled_status;       //node to handle wled reading_______A
+ 	char *mt_tled;           //method to handle tled_____________R
+ 	char *tled_status;       //node to handle tled reading_______A
+	char *mt_lcd_switch;     //method to turn LCD ON/OFF_________A
+	char *lcd_status;        //node to read LCD panel state______A
+	char *brightness_up;     //method to set brightness up_______A
+	char *brightness_down;   //guess what ?______________________A
+	char *brightness_set;    //method to set absolute brightness_R
+	char *brightness_get;    //method to get absolute brightness_R
+	char *brightness_status; //node to get brightness____________A
+	char *display_set;       //method to set video output________R
+	char *display_get;       //method to get video output________R
+};
+
+/*
+ * This is the main structure, we can use it to store anything interesting
+ * about the hotk device
+ */
+struct asus_hotk {
+	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, ...
+	struct model_data *methods; //methods available on the laptop
+	u8 brightness;              //brightness level
+	enum {
+		A1x = 0,  //A1340D, A1300F
+		A2x,      //A2500H
+		D1x,      //D1
+		L2D,      //L2000D
+		L3C,      //L3800C
+		L3D,      //L3400D
+		L3H,      //L3H, but also L2000E
+		L4R,      //L4500R
+		L5x,      //L5800C 
+		L8L,      //L8400L
+		M1A,      //M1300A
+		M2E,      //M2400E, L4400L
+		M6N,      //M6800N
+		M6R,      //M6700R
+		P30,	  //Samsung P30
+		S1x,      //S1300A, but also L1400B and M2400A (L84F)
+		S2x,      //S200 (J1 reported), Victor MP-XP7210
+		xxN,      //M2400N, M3700N, M5200N, S1300N, S5200N, W1OOON
+			  //(Centrino)
+		END_MODEL
+	} model;              //Models currently supported
+	u16 event_count[128]; //count for each event TODO make this better
+};
+
+/* Here we go */
+#define A1x_PREFIX "\\_SB.PCI0.ISA.EC0."
+#define L3C_PREFIX "\\_SB.PCI0.PX40.ECD0."
+#define M1A_PREFIX "\\_SB.PCI0.PX40.EC0."
+#define P30_PREFIX "\\_SB.PCI0.LPCB.EC0."
+#define S1x_PREFIX "\\_SB.PCI0.PX40."
+#define S2x_PREFIX A1x_PREFIX
+#define xxN_PREFIX "\\_SB.PCI0.SBRG.EC0."
+
+static struct model_data model_conf[END_MODEL] = {
+        /*
+	 * Those pathnames are relative to the HOTK / ATKD device :
+	 *       - mt_mled
+	 *       - mt_wled
+	 *       - brightness_set
+	 *       - brightness_get
+	 *       - display_set
+	 *       - display_get
+	 *
+	 * TODO I have seen a SWBX and AIBX method on some models, like L1400B,
+	 * it seems to be a kind of switch, but what for ?
+	 *
+	 */
+
+	{
+		.name              = "A1x",
+		.mt_mled           = "MLED",
+		.mled_status       = "\\MAIL",
+		.mt_lcd_switch     = A1x_PREFIX "_Q10",
+		.lcd_status        = "\\BKLI",
+		.brightness_up     = A1x_PREFIX "_Q0E",
+		.brightness_down   = A1x_PREFIX "_Q0F"
+	},
+
+	{
+		.name              = "A2x",
+		.mt_mled           = "MLED",
+		.mt_wled           = "WLED",
+		.wled_status       = "\\SG66",
+		.mt_lcd_switch     = "\\Q10",
+		.lcd_status        = "\\BAOF",
+		.brightness_set    = "SPLV",
+		.brightness_get    = "GPLV",
+		.display_set       = "SDSP",
+		.display_get       = "\\INFB"
+	},
+
+	{
+		.name              = "D1x",
+		.mt_mled           = "MLED",
+		.mt_lcd_switch     = "\\Q0D",
+		.lcd_status        = "\\GP11",
+		.brightness_up     = "\\Q0C",
+		.brightness_down   = "\\Q0B",
+		.brightness_status = "\\BLVL",
+		.display_set       = "SDSP",
+		.display_get       = "\\INFB"
+	},
+
+	{
+		.name              = "L2D",
+		.mt_mled           = "MLED",
+		.mled_status       = "\\SGP6",
+		.mt_wled           = "WLED",
+		.wled_status       = "\\RCP3",
+		.mt_lcd_switch     = "\\Q10",
+		.lcd_status        = "\\SGP0",
+		.brightness_up     = "\\Q0E",
+		.brightness_down   = "\\Q0F",
+		.display_set       = "SDSP",
+		.display_get       = "\\INFB"
+	},
+
+	{
+		.name              = "L3C",
+		.mt_mled           = "MLED",
+		.mt_wled           = "WLED",
+		.mt_lcd_switch     = L3C_PREFIX "_Q10",
+		.lcd_status        = "\\GL32",
+		.brightness_set    = "SPLV",
+		.brightness_get    = "GPLV",
+		.display_set       = "SDSP",
+		.display_get       = "\\_SB.PCI0.PCI1.VGAC.NMAP"
+	},
+
+	{
+		.name              = "L3D",
+		.mt_mled           = "MLED",
+		.mled_status       = "\\MALD",
+		.mt_wled           = "WLED",
+		.mt_lcd_switch     = "\\Q10",
+		.lcd_status        = "\\BKLG",
+		.brightness_set    = "SPLV",
+		.brightness_get    = "GPLV",
+		.display_set       = "SDSP",
+		.display_get       = "\\INFB"
+	},
+
+	{
+		.name              = "L3H",
+		.mt_mled           = "MLED",
+		.mt_wled           = "WLED",
+		.mt_lcd_switch     = "EHK",
+		.lcd_status        = "\\_SB.PCI0.PM.PBC",
+		.brightness_set    = "SPLV",
+		.brightness_get    = "GPLV",
+		.display_set       = "SDSP",
+		.display_get       = "\\INFB"
+	},
+
+	{
+		.name              = "L4R",
+		.mt_mled           = "MLED",
+		.mt_wled           = "WLED",
+		.wled_status       = "\\_SB.PCI0.SBRG.SG13",
+		.mt_lcd_switch     = xxN_PREFIX "_Q10",
+		.lcd_status        = "\\_SB.PCI0.SBSM.SEO4",
+		.brightness_set    = "SPLV",
+		.brightness_get    = "GPLV", 
+		.display_set       = "SDSP",
+		.display_get       = "\\_SB.PCI0.P0P1.VGA.GETD"
+	},
+
+	{
+		.name              = "L5x",
+		.mt_mled           = "MLED",
+/* WLED present, but not controlled by ACPI */
+		.mt_tled           = "TLED",
+		.mt_lcd_switch     = "\\Q0D",
+		.lcd_status        = "\\BAOF",
+		.brightness_set    = "SPLV",
+		.brightness_get    = "GPLV",
+		.display_set       = "SDSP",
+		.display_get       = "\\INFB"
+	},
+
+	{
+		.name              = "L8L"
+/* No features, but at least support the hotkeys */
+	},
+
+	{
+		.name              = "M1A",
+		.mt_mled           = "MLED",
+		.mt_lcd_switch     = M1A_PREFIX "Q10",
+		.lcd_status        = "\\PNOF",
+		.brightness_up     = M1A_PREFIX "Q0E",
+		.brightness_down   = M1A_PREFIX "Q0F",
+		.brightness_status = "\\BRIT",
+		.display_set       = "SDSP",
+		.display_get       = "\\INFB"
+	},
+
+	{
+		.name              = "M2E",
+		.mt_mled           = "MLED",
+		.mt_wled           = "WLED",
+		.mt_lcd_switch     = "\\Q10",
+		.lcd_status        = "\\GP06",
+		.brightness_set    = "SPLV",
+		.brightness_get    = "GPLV",
+		.display_set       = "SDSP",
+		.display_get       = "\\INFB"
+	},
+
+	{
+		.name              = "M6N",
+		.mt_mled           = "MLED",
+		.mt_wled           = "WLED",
+		.wled_status       = "\\_SB.PCI0.SBRG.SG13",
+		.mt_lcd_switch     = xxN_PREFIX "_Q10",
+		.lcd_status        = "\\_SB.BKLT",
+		.brightness_set    = "SPLV",
+		.brightness_get    = "GPLV",
+		.display_set       = "SDSP",
+		.display_get       = "\\SSTE"
+	},
+	{
+		.name              = "M6R",
+		.mt_mled           = "MLED",
+		.mt_wled           = "WLED",
+		.mt_lcd_switch     = xxN_PREFIX "_Q10",
+		.lcd_status        = "\\_SB.PCI0.SBSM.SEO4",
+		.brightness_set    = "SPLV",
+		.brightness_get    = "GPLV",
+		.display_set       = "SDSP",
+		.display_get       = "\\SSTE"
+	},
+
+
+	{
+		.name              = "P30",
+		.mt_wled           = "WLED",
+		.mt_lcd_switch     = P30_PREFIX "_Q0E",
+		.lcd_status        = "\\BKLT",
+		.brightness_up     = P30_PREFIX "_Q68",
+		.brightness_down   = P30_PREFIX "_Q69",
+		.brightness_get    = "GPLV",
+		.display_set       = "SDSP",
+		.display_get       = "\\DNXT"
+	},
+
+	{
+		.name              = "S1x",
+		.mt_mled           = "MLED",
+		.mled_status       = "\\EMLE",
+		.mt_wled           = "WLED",
+		.mt_lcd_switch     = S1x_PREFIX "Q10" ,
+		.lcd_status        = "\\PNOF",
+		.brightness_set    = "SPLV",
+		.brightness_get    = "GPLV"
+	},
+
+	{
+		.name              = "S2x",
+		.mt_mled           = "MLED",
+		.mled_status       = "\\MAIL",
+		.mt_lcd_switch     = S2x_PREFIX "_Q10",
+		.lcd_status        = "\\BKLI",
+		.brightness_up     = S2x_PREFIX "_Q0B",
+		.brightness_down   = S2x_PREFIX "_Q0A"
+	},
+
+	{
+		.name              = "xxN",
+		.mt_mled           = "MLED",
+/* WLED present, but not controlled by ACPI */
+		.mt_lcd_switch     = xxN_PREFIX "_Q10",
+		.lcd_status        = "\\BKLT",
+		.brightness_set    = "SPLV",
+		.brightness_get    = "GPLV",
+		.display_set       = "SDSP",
+		.display_get       = "\\ADVG"
+	}
+};
+
+/* procdir we use */
+static struct proc_dir_entry *asus_proc_dir;
+
+/*
+ * 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 = 	ACPI_HOTK_NAME,
+	.class = 	ACPI_HOTK_CLASS,
+	.ids = 		ACPI_HOTK_HID,
+	.ops = 		{
+				.add = 		asus_hotk_add,
+				.remove = 	asus_hotk_remove,
+			},
+};
+
+/* 
+ * 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_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, NULL, &output);
+	*val = out_obj.integer.value;
+	return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
+}
+
+/*
+ * 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 int
+proc_read_info(char *page, char **start, off_t off, int count, int *eof,
+		void *data)
+{
+	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, ACPI_HOTK_NAME " " ASUS_ACPI_VERSION "\n");
+	len += sprintf(page + len, "Model reference    : %s\n", 
+		       hotk->methods->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))
+		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))
+		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;
+}
+
+
+/*
+ * /proc 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
+ */
+
+/* Generic LED functions */
+static int
+read_led(const char *ledname, int ledmask)
+{
+	if (ledname) {
+		int led_status;
+
+		if (read_acpi_int(NULL, ledname, &led_status))
+			return led_status;
+		else
+			printk(KERN_WARNING "Asus ACPI: Error reading LED "
+			       "status\n");
+	}
+	return (hotk->status & ledmask) ? 1 : 0;
+}
+
+static int parse_arg(const char __user *buf, unsigned long count, int *val)
+{
+	char s[32];
+	if (!count)
+		return 0;
+	if (count > 31)
+		return -EINVAL;
+	if (copy_from_user(s, buf, count))
+		return -EFAULT;
+	s[count] = 0;
+	if (sscanf(s, "%i", val) != 1)
+		return -EINVAL;
+	return count;
+}
+
+/* FIXME: kill extraneous args so it can be called independently */
+static int
+write_led(const char __user *buffer, unsigned long count,
+          char *ledname, int ledmask, int invert)
+{
+	int value;
+	int led_out = 0;
+
+	count = parse_arg(buffer, count, &value);
+	if (count > 0)
+		led_out = value ? 1 : 0;
+
+	hotk->status =
+	    (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);
+
+	if (invert) /* invert target value */
+		led_out = !led_out & 0x1;
+
+	if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
+		printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n", ledname);
+
+	return count;
+}
+
+
+/*
+ * Proc handlers for MLED
+ */
+static int
+proc_read_mled(char *page, char **start, off_t off, int count, int *eof,
+	       void *data)
+{
+	return sprintf(page, "%d\n", read_led(hotk->methods->mled_status, MLED_ON));
+}
+
+
+static int
+proc_write_mled(struct file *file, const char __user *buffer,
+		unsigned long count, void *data)
+{
+	return write_led(buffer, count, hotk->methods->mt_mled, MLED_ON, 1);
+}
+
+/*
+ * Proc handlers for WLED
+ */
+static int
+proc_read_wled(char *page, char **start, off_t off, int count, int *eof,
+	       void *data)
+{
+	return sprintf(page, "%d\n", read_led(hotk->methods->wled_status, WLED_ON));
+}
+
+static int
+proc_write_wled(struct file *file, const char __user *buffer,
+		unsigned long count, void *data)
+{
+	return write_led(buffer, count, hotk->methods->mt_wled, WLED_ON, 0);
+}
+
+/*
+ * Proc handlers for TLED
+ */
+static int
+proc_read_tled(char *page, char **start, off_t off, int count, int *eof,
+	       void *data)
+{
+	return sprintf(page, "%d\n", read_led(hotk->methods->tled_status, TLED_ON));
+}
+
+static int
+proc_write_tled(struct file *file, const char __user *buffer,
+		unsigned long count, void *data)
+{
+	return write_led(buffer, count, hotk->methods->mt_tled, TLED_ON, 0);
+}
+
+
+static int get_lcd_state(void)
+{
+	int lcd = 0;
+
+	if (hotk->model != L3H) {
+	/* We don't have to check anything if we are here */
+		if (!read_acpi_int(NULL, hotk->methods->lcd_status, &lcd))
+			printk(KERN_WARNING "Asus ACPI: Error reading LCD status\n");
+	
+		if (hotk->model == L2D)
+			lcd = ~lcd;
+	} else { /* L3H and the like have to be handled differently */
+		acpi_status status = 0;
+		struct acpi_object_list input;
+		union acpi_object mt_params[2];
+		struct acpi_buffer output;
+		union acpi_object out_obj;
+		
+		input.count = 2;
+		input.pointer = mt_params;
+		/* Note: the following values are partly guessed up, but 
+		   otherwise they seem to work */
+		mt_params[0].type = ACPI_TYPE_INTEGER;
+		mt_params[0].integer.value = 0x02;
+		mt_params[1].type = ACPI_TYPE_INTEGER;
+		mt_params[1].integer.value = 0x02;
+
+		output.length = sizeof(out_obj);
+		output.pointer = &out_obj;
+		
+		status = acpi_evaluate_object(NULL, hotk->methods->lcd_status, &input, &output);
+		if (status != AE_OK)
+			return -1;
+		if (out_obj.type == ACPI_TYPE_INTEGER)
+			/* That's what the AML code does */
+			lcd = out_obj.integer.value >> 8;
+	}
+	
+	return (lcd & 1);
+}
+
+static int set_lcd_state(int value)
+{
+	int lcd = 0;
+	acpi_status status = 0;
+
+	lcd = value ? 1 : 0;
+	if (lcd != get_lcd_state()) {
+		/* switch */
+		if (hotk->model != L3H) {
+			status =
+			    acpi_evaluate_object(NULL, hotk->methods->mt_lcd_switch,
+						 NULL, NULL);
+		} else { /* L3H and the like have to be handled differently */
+			if (!write_acpi_int(hotk->handle, hotk->methods->mt_lcd_switch, 0x07, NULL))
+				status = AE_ERROR;
+			/* L3H's AML executes EHK (0x07) upon Fn+F7 keypress, 
+			   the exact behaviour is simulated here */
+		}
+		if (ACPI_FAILURE(status))
+			printk(KERN_WARNING "Asus ACPI: Error switching LCD\n");
+	}
+	return 0;
+
+}
+
+static int
+proc_read_lcd(char *page, char **start, off_t off, int count, int *eof,
+	      void *data)
+{
+	return sprintf(page, "%d\n", get_lcd_state());
+}
+
+
+static int
+proc_write_lcd(struct file *file, const char __user *buffer,
+	       unsigned long count, void *data)
+{
+	int value;
+	
+	count = parse_arg(buffer, count, &value);
+	if (count > 0)
+		set_lcd_state(value);
+	return count;
+}
+
+
+static int read_brightness(void)
+{
+	int value;
+	
+	if(hotk->methods->brightness_get) { /* SPLV/GPLV laptop */
+		if (!read_acpi_int(hotk->handle, hotk->methods->brightness_get, 
+				   &value))
+			printk(KERN_WARNING "Asus ACPI: Error reading brightness\n");
+	} else if (hotk->methods->brightness_status) { /* For D1 for example */
+		if (!read_acpi_int(NULL, hotk->methods->brightness_status, 
+				   &value))
+			printk(KERN_WARNING "Asus ACPI: Error reading brightness\n");
+	} else /* No GPLV method */
+		value = hotk->brightness;
+	return value;
+}
+
+/*
+ * Change the brightness level
+ */
+static void set_brightness(int value)
+{
+	acpi_status status = 0;
+
+	/* SPLV laptop */
+	if(hotk->methods->brightness_set) {
+		if (!write_acpi_int(hotk->handle, hotk->methods->brightness_set, 
+				    value, NULL))
+			printk(KERN_WARNING "Asus ACPI: Error changing brightness\n");
+		return;
+	}
+
+	/* No SPLV method if we are here, act as appropriate */
+	value -= read_brightness();
+	while (value != 0) {
+		status = acpi_evaluate_object(NULL, (value > 0) ? 
+					      hotk->methods->brightness_up : 
+					      hotk->methods->brightness_down,
+					      NULL, NULL);
+		(value > 0) ? value-- : value++;
+		if (ACPI_FAILURE(status))
+			printk(KERN_WARNING "Asus ACPI: Error changing brightness\n");
+	}
+	return;
+}
+
+static int
+proc_read_brn(char *page, char **start, off_t off, int count, int *eof,
+	      void *data)
+{
+	return sprintf(page, "%d\n", read_brightness());
+}
+
+static int
+proc_write_brn(struct file *file, const char __user *buffer,
+	       unsigned long count, void *data)
+{
+	int value;
+
+	count = parse_arg(buffer, count, &value);
+	if (count > 0) {
+		value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
+			/* 0 <= value <= 15 */
+		set_brightness(value);
+	} else if (count < 0) {
+		printk(KERN_WARNING "Asus ACPI: Error reading user input\n");
+	}
+
+	return count;
+}
+
+static void set_display(int value)
+{
+	/* no sanity check needed for now */
+	if (!write_acpi_int(hotk->handle, hotk->methods->display_set, 
+			    value, NULL))
+		printk(KERN_WARNING "Asus ACPI: Error setting display\n");
+	return;
+}
+
+/*
+ * Now, *this* one could be more user-friendly, but so far, no-one has 
+ * complained. The significance of bits is the same as in proc_write_disp()
+ */
+static int
+proc_read_disp(char *page, char **start, off_t off, int count, int *eof,
+	      void *data)
+{
+	int value = 0;
+	
+	if (!read_acpi_int(hotk->handle, hotk->methods->display_get, &value))
+		printk(KERN_WARNING "Asus ACPI: Error reading display status\n");
+	value &= 0x07; /* needed for some models, shouldn't hurt others */
+	return sprintf(page, "%d\n", value);
+}
+
+/*
+ * Experimental support for display switching. As of now: 1 should activate 
+ * the LCD output, 2 should do for CRT, and 4 for TV-Out. Any combination 
+ * (bitwise) of these will suffice. I never actually tested 3 displays hooked up 
+ * simultaneously, so be warned. See the acpi4asus README for more info.
+ */
+static int
+proc_write_disp(struct file *file, const char __user *buffer,
+	       unsigned long count, void *data)
+{
+	int value;
+
+	count = parse_arg(buffer, count, &value);
+	if (count > 0)
+		set_display(value);
+	else if (count < 0)
+		printk(KERN_WARNING "Asus ACPI: Error reading user input\n");
+
+	return count;
+}
+
+
+typedef int (proc_readfunc)(char *page, char **start, off_t off, int count,
+	                     int *eof, void *data);
+typedef int (proc_writefunc)(struct file *file, const char __user *buffer,
+	                      unsigned long count, void *data);
+
+static int
+__init asus_proc_add(char *name, proc_writefunc *writefunc,
+	             proc_readfunc *readfunc, mode_t mode,
+	             struct acpi_device *device)
+{
+	struct proc_dir_entry *proc = create_proc_entry(name, mode, acpi_device_dir(device));
+	if(!proc) {
+		printk(KERN_WARNING "  Unable to create %s fs entry\n", name);
+		return -1;
+	}
+	proc->write_proc = writefunc;
+	proc->read_proc = readfunc;
+	proc->data = acpi_driver_data(device);
+	proc->owner = THIS_MODULE;
+	proc->uid = asus_uid;
+	proc->gid = asus_gid;
+	return 0;
+}
+
+static int __init asus_hotk_add_fs(struct acpi_device *device)
+{
+	struct proc_dir_entry *proc;
+	mode_t mode;
+	
+	/*
+	 * If parameter uid or gid is not changed, keep the default setting for
+	 * our proc entries (-rw-rw-rw-) else, it means we care about security,
+	 * and then set to -rw-rw----
+	 */
+
+	if ((asus_uid == 0) && (asus_gid == 0)){
+		mode = S_IFREG | S_IRUGO | S_IWUGO;
+	} else {
+		mode = S_IFREG | S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
+	}
+
+	acpi_device_dir(device) = asus_proc_dir;
+	if (!acpi_device_dir(device))
+		return -ENODEV;
+
+	proc = create_proc_entry(PROC_INFO, mode, acpi_device_dir(device));
+	if (proc) {
+		proc->read_proc = proc_read_info;
+		proc->data = acpi_driver_data(device);
+		proc->owner = THIS_MODULE;
+		proc->uid = asus_uid;
+		proc->gid = asus_gid;
+	} else {
+		printk(KERN_WARNING "  Unable to create " PROC_INFO
+		       " fs entry\n");
+	}
+
+	if (hotk->methods->mt_wled) {
+		asus_proc_add(PROC_WLED, &proc_write_wled, &proc_read_wled, mode, device);
+	}
+
+	if (hotk->methods->mt_mled) {
+		asus_proc_add(PROC_MLED, &proc_write_mled, &proc_read_mled, mode, device);
+	}
+
+	if (hotk->methods->mt_tled) {
+		asus_proc_add(PROC_TLED, &proc_write_tled, &proc_read_tled, mode, device);
+	}
+
+	/* 
+	 * We need both read node and write method as LCD switch is also accessible
+	 * from keyboard 
+	 */
+	if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status) {
+		asus_proc_add(PROC_LCD, &proc_write_lcd, &proc_read_lcd, mode, device);
+	}
+	
+	if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
+	    (hotk->methods->brightness_get && hotk->methods->brightness_set)) {
+		asus_proc_add(PROC_BRN, &proc_write_brn, &proc_read_brn, mode, device);
+	}
+
+	if (hotk->methods->display_set) {
+		asus_proc_add(PROC_DISP, &proc_write_disp, &proc_read_disp, mode, device);
+	}
+
+	return 0;
+}
+
+static int asus_hotk_remove_fs(struct acpi_device* device)
+{
+	if(acpi_device_dir(device)) {
+		remove_proc_entry(PROC_INFO,acpi_device_dir(device));
+		if (hotk->methods->mt_wled)
+			remove_proc_entry(PROC_WLED,acpi_device_dir(device));
+		if (hotk->methods->mt_mled)
+			remove_proc_entry(PROC_MLED,acpi_device_dir(device));
+		if (hotk->methods->mt_tled)
+			remove_proc_entry(PROC_TLED,acpi_device_dir(device));
+		if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status)
+			remove_proc_entry(PROC_LCD, acpi_device_dir(device));
+		if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
+		    (hotk->methods->brightness_get && hotk->methods->brightness_set))
+			remove_proc_entry(PROC_BRN, acpi_device_dir(device));
+		if (hotk->methods->display_set)
+			remove_proc_entry(PROC_DISP, acpi_device_dir(device));
+	}
+	return 0;
+}
+
+
+static void asus_hotk_notify(acpi_handle handle, u32 event, void *data)
+{
+	/* TODO Find a better way to handle events count.*/
+	if (!hotk)
+		return;
+
+	if ((event & ~((u32) BR_UP)) < 16) {
+		hotk->brightness = (event & ~((u32) BR_UP));
+	} else if ((event & ~((u32) BR_DOWN)) < 16 ) {
+		hotk->brightness = (event & ~((u32) BR_DOWN));
+	}
+
+	acpi_bus_generate_event(hotk->device, event,
+				hotk->event_count[event % 128]++);
+
+	return;
+}
+
+/*
+ * 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 __init 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;
+	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_DSDT, 1, &dsdt);
+	if (ACPI_FAILURE(status))
+		printk(KERN_WARNING "  Couldn't get the DSDT table header\n");
+	else
+		asus_info = (struct acpi_table_header *) 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(KERN_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))
+		printk(KERN_WARNING "  Error calling BSTS\n");
+	else if (bsts_result)
+		printk(KERN_NOTICE "  BSTS called, 0x%02x returned\n", bsts_result);
+
+	/* Samsung P30 has a device with a valid _HID whose INIT does not 
+	 * return anything. Catch this one and any similar here */
+	if (buffer.pointer == NULL) {
+		if (asus_info && /* Samsung P30 */
+		    strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) {
+			hotk->model = P30;
+			printk(KERN_NOTICE "  Samsung P30 detected, supported\n");
+		} else {
+			hotk->model = M2E;
+			printk(KERN_WARNING "  no string returned by INIT\n");
+			printk(KERN_WARNING "  trying default values, supply "
+			       "the developers with your DSDT\n");
+		}
+		hotk->methods = &model_conf[hotk->model];
+		return AE_OK;
+	}
+	
+	model = (union acpi_object *) buffer.pointer;
+	if (model->type == ACPI_TYPE_STRING) {
+		printk(KERN_NOTICE "  %s model detected, ", model->string.pointer);
+	}
+
+	hotk->model = END_MODEL;
+	if (strncmp(model->string.pointer, "L3D", 3) == 0)
+		hotk->model = L3D;
+	else if (strncmp(model->string.pointer, "L3H", 3) == 0 ||
+		 strncmp(model->string.pointer, "L2E", 3) == 0)
+		hotk->model = L3H;
+	else if (strncmp(model->string.pointer, "L3", 2) == 0 ||
+		 strncmp(model->string.pointer, "L2B", 3) == 0)
+		hotk->model = L3C;
+	else if (strncmp(model->string.pointer, "L8L", 3) == 0)
+		hotk->model = L8L;
+	else if (strncmp(model->string.pointer, "L4R", 3) == 0)
+		hotk->model = L4R;
+	else if (strncmp(model->string.pointer, "M6N", 3) == 0)
+		hotk->model = M6N;
+	else if (strncmp(model->string.pointer, "M6R", 3) == 0)
+		hotk->model = M6R;
+	else if (strncmp(model->string.pointer, "M2N", 3) == 0 ||
+		 strncmp(model->string.pointer, "M3N", 3) == 0 ||
+		 strncmp(model->string.pointer, "M5N", 3) == 0 ||
+		 strncmp(model->string.pointer, "M6N", 3) == 0 ||
+		 strncmp(model->string.pointer, "S1N", 3) == 0 ||
+		 strncmp(model->string.pointer, "S5N", 3) == 0 ||
+                 strncmp(model->string.pointer, "W1N", 3) == 0)
+		hotk->model = xxN;
+	else if (strncmp(model->string.pointer, "M1", 2) == 0)
+		hotk->model = M1A;
+	else if (strncmp(model->string.pointer, "M2", 2) == 0 ||
+		 strncmp(model->string.pointer, "L4E", 3) == 0)
+		hotk->model = M2E;
+	else if (strncmp(model->string.pointer, "L2", 2) == 0)
+		hotk->model = L2D;
+	else if (strncmp(model->string.pointer, "L8", 2) == 0)
+		hotk->model = S1x;
+	else if (strncmp(model->string.pointer, "D1", 2) == 0)
+		hotk->model = D1x;
+	else if (strncmp(model->string.pointer, "A1", 2) == 0)
+		hotk->model = A1x;
+	else if (strncmp(model->string.pointer, "A2", 2) == 0)
+		hotk->model = A2x;
+	else if (strncmp(model->string.pointer, "J1", 2) == 0)
+		hotk->model = S2x;
+	else if (strncmp(model->string.pointer, "L5", 2) == 0)
+		hotk->model = L5x;
+
+	if (hotk->model == END_MODEL) {
+		printk("unsupported, trying default values, supply the "
+		       "developers with your DSDT\n");
+		hotk->model = M2E;
+	} else {
+		printk("supported\n");
+	}
+
+	hotk->methods = &model_conf[hotk->model];
+
+	/* Sort of per-model blacklist */
+	if (strncmp(model->string.pointer, "L2B", 3) == 0)
+		hotk->methods->lcd_status = NULL; 
+	/* L2B is similar enough to L3C to use its settings, with this only 
+	   exception */
+	else if (strncmp(model->string.pointer, "S5N", 3) == 0 ||
+		 strncmp(model->string.pointer, "M5N", 3) == 0)
+		hotk->methods->mt_mled = NULL; 
+	/* S5N and M5N have no MLED */
+	else if (strncmp(model->string.pointer, "M2N", 3) == 0 ||
+		 strncmp(model->string.pointer, "W1N", 3) == 0)
+		hotk->methods->mt_wled = "WLED"; 
+	/* M2N and W1N have a usable WLED */
+	else if (asus_info) {
+		if (strncmp(asus_info->oem_table_id, "L1", 2) == 0)
+			hotk->methods->mled_status = NULL;
+	/* S1300A reports L84F, but L1400B too, account for that */
+	}
+
+	acpi_os_free(model);
+
+	return AE_OK;
+}
+
+
+static int __init 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(KERN_ERR "  Hotkey device not present, aborting\n");
+		return -EINVAL;
+	}
+
+	return result;
+}
+
+
+static int __init asus_hotk_add(struct acpi_device *device)
+{
+	acpi_status status = AE_OK;
+	int result;
+
+	if (!device)
+		return -EINVAL;
+
+	printk(KERN_NOTICE "Asus Laptop ACPI Extras version %s\n",
+	       ASUS_ACPI_VERSION);
+
+	hotk =
+	    (struct asus_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), ACPI_HOTK_DEVICE_NAME);
+	strcpy(acpi_device_class(device), ACPI_HOTK_CLASS);
+	acpi_driver_data(device) = hotk;
+	hotk->device = device;
+
+
+	result = asus_hotk_check();
+	if (result)
+		goto end;
+
+	result = asus_hotk_add_fs(device);
+	if (result)
+		goto end;
+
+	/*
+	 * 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(KERN_ERR "  Error installing notify handler\n");
+
+	/* For laptops without GPLV: init the hotk->brightness value */
+	if ((!hotk->methods->brightness_get) && (!hotk->methods->brightness_status) &&
+	    (hotk->methods->brightness_up && hotk->methods->brightness_down)) {
+		status = acpi_evaluate_object(NULL, hotk->methods->brightness_down,
+					      NULL, NULL);
+		if (ACPI_FAILURE(status))
+			printk(KERN_WARNING "  Error changing brightness\n");
+		else {
+			status = acpi_evaluate_object(NULL, hotk->methods->brightness_up,
+						      NULL, NULL);
+			if (ACPI_FAILURE(status))
+				printk(KERN_WARNING "  Strange, error changing" 
+				       " brightness\n");
+		}
+	}
+
+      end:
+	if (result) {
+		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(KERN_ERR "Asus ACPI: Error removing notify handler\n");
+
+	asus_hotk_remove_fs(device);
+
+	kfree(hotk);
+
+	return 0;
+}
+
+
+static int __init asus_acpi_init(void)
+{
+	int result;
+
+	if (acpi_disabled)
+		return -ENODEV;
+
+	asus_proc_dir = proc_mkdir(PROC_ASUS, acpi_root_dir);
+	if (!asus_proc_dir) {
+		printk(KERN_ERR "Asus ACPI: Unable to create /proc entry\n");
+		return -ENODEV;
+	}
+	asus_proc_dir->owner = THIS_MODULE;
+
+	result = acpi_bus_register_driver(&asus_hotk_driver);
+	if (result < 1) {
+		acpi_bus_unregister_driver(&asus_hotk_driver);
+		remove_proc_entry(PROC_ASUS, acpi_root_dir);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+
+static void __exit asus_acpi_exit(void)
+{
+	acpi_bus_unregister_driver(&asus_hotk_driver);
+	remove_proc_entry(PROC_ASUS, acpi_root_dir);
+
+	acpi_os_free(asus_info);
+
+	return;
+}
+
+module_init(asus_acpi_init);
+module_exit(asus_acpi_exit);