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);