git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/asus_acpi.c

   1 /*
   2  *  asus_acpi.c - Asus Laptop ACPI Extras
   3  *
   4  *
   5  *  Copyright (C) 2002-2005 Julien Lerouge, 2003-2006 Karol Kozimor
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *
  22  *  The development page for this driver is located at
  23  *  http://sourceforge.net/projects/acpi4asus/
  24  *
  25  *  Credits:
  26  *  Pontus Fuchs   - Helper functions, cleanup
  27  *  Johann Wiesner - Small compile fixes
  28  *  John Belmonte  - ACPI code for Toshiba laptop was a good starting point.
  29  *  Éric Burghard  - LED display support for W1N
  30  *
  31  */
  32
  33 #include <linux/kernel.h>
  34 #include <linux/module.h>
  35 #include <linux/init.h>
  36 #include <linux/types.h>
  37 #include <linux/proc_fs.h>
  38 #include <acpi/acpi_drivers.h>
  39 #include <acpi/acpi_bus.h>
  40 #include <asm/uaccess.h>
  41
  42 #define ASUS_ACPI_VERSION "0.30"
  43
  44 #define PROC_ASUS       "asus"  //the directory
  45 #define PROC_MLED       "mled"
  46 #define PROC_WLED       "wled"
  47 #define PROC_TLED       "tled"
  48 #define PROC_BT         "bluetooth"
  49 #define PROC_LEDD       "ledd"
  50 #define PROC_INFO       "info"
  51 #define PROC_LCD        "lcd"
  52 #define PROC_BRN        "brn"
  53 #define PROC_DISP       "disp"
  54
  55 #define ACPI_HOTK_NAME          "Asus Laptop ACPI Extras Driver"
  56 #define ACPI_HOTK_CLASS         "hotkey"
  57 #define ACPI_HOTK_DEVICE_NAME   "Hotkey"
  58 #define ACPI_HOTK_HID           "ATK0100"
  59
  60 /*
  61  * Some events we use, same for all Asus
  62  */
  63 #define BR_UP       0x10
  64 #define BR_DOWN     0x20
  65
  66 /*
  67  * Flags for hotk status
  68  */
  69 #define MLED_ON     0x01        //mail LED
  70 #define WLED_ON     0x02        //wireless LED
  71 #define TLED_ON     0x04        //touchpad LED
  72 #define BT_ON       0x08        //internal Bluetooth
  73
  74 MODULE_AUTHOR("Julien Lerouge, Karol Kozimor");
  75 MODULE_DESCRIPTION(ACPI_HOTK_NAME);
  76 MODULE_LICENSE("GPL");
  77
  78 static uid_t asus_uid;
  79 static gid_t asus_gid;
  80 module_param(asus_uid, uint, 0);
  81 MODULE_PARM_DESC(asus_uid, "UID for entries in /proc/acpi/asus.\n");
  82 module_param(asus_gid, uint, 0);
  83 MODULE_PARM_DESC(asus_gid, "GID for entries in /proc/acpi/asus.\n");
  84
  85 /* For each model, all features implemented,
  86  * those marked with R are relative to HOTK, A for absolute */
  87 struct model_data {
  88         char *name;             //name of the laptop________________A
  89         char *mt_mled;          //method to handle mled_____________R
  90         char *mled_status;      //node to handle mled reading_______A
  91         char *mt_wled;          //method to handle wled_____________R
  92         char *wled_status;      //node to handle wled reading_______A
  93         char *mt_tled;          //method to handle tled_____________R
  94         char *tled_status;      //node to handle tled reading_______A
  95         char *mt_ledd;          //method to handle LED display______R
  96         char *mt_bt_switch;     //method to switch Bluetooth on/off_R
  97         char *bt_status;        //no model currently supports this__?
  98         char *mt_lcd_switch;    //method to turn LCD on/off_________A
  99         char *lcd_status;       //node to read LCD panel state______A
 100         char *brightness_up;    //method to set brightness up_______A
 101         char *brightness_down;  //guess what ?______________________A
 102         char *brightness_set;   //method to set absolute brightness_R
 103         char *brightness_get;   //method to get absolute brightness_R
 104         char *brightness_status;        //node to get brightness____________A
 105         char *display_set;      //method to set video output________R
 106         char *display_get;      //method to get video output________R
 107 };
 108
 109 /*
 110  * This is the main structure, we can use it to store anything interesting
 111  * about the hotk device
 112  */
 113 struct asus_hotk {
 114         struct acpi_device *device;     //the device we are in
 115         acpi_handle handle;     //the handle of the hotk device
 116         char status;            //status of the hotk, for LEDs, ...
 117         u32 ledd_status;        //status of the LED display
 118         struct model_data *methods;     //methods available on the laptop
 119         u8 brightness;          //brightness level
 120         enum {
 121                 A1x = 0,        //A1340D, A1300F
 122                 A2x,            //A2500H
 123                 A4G,            //A4700G
 124                 D1x,            //D1
 125                 L2D,            //L2000D
 126                 L3C,            //L3800C
 127                 L3D,            //L3400D
 128                 L3H,            //L3H, L2000E, L5D
 129                 L4R,            //L4500R
 130                 L5x,            //L5800C
 131                 L8L,            //L8400L
 132                 M1A,            //M1300A
 133                 M2E,            //M2400E, L4400L
 134                 M6N,            //M6800N, W3400N
 135                 M6R,            //M6700R, A3000G
 136                 P30,            //Samsung P30
 137                 S1x,            //S1300A, but also L1400B and M2400A (L84F)
 138                 S2x,            //S200 (J1 reported), Victor MP-XP7210
 139                 W1N,            //W1000N
 140                 W5A,            //W5A
 141                 xxN,            //M2400N, M3700N, M5200N, M6800N, S1300N, S5200N
 142                 //(Centrino)
 143                 END_MODEL
 144         } model;                //Models currently supported
 145         u16 event_count[128];   //count for each event TODO make this better
 146 };
 147
 148 /* Here we go */
 149 #define A1x_PREFIX "\\_SB.PCI0.ISA.EC0."
 150 #define L3C_PREFIX "\\_SB.PCI0.PX40.ECD0."
 151 #define M1A_PREFIX "\\_SB.PCI0.PX40.EC0."
 152 #define P30_PREFIX "\\_SB.PCI0.LPCB.EC0."
 153 #define S1x_PREFIX "\\_SB.PCI0.PX40."
 154 #define S2x_PREFIX A1x_PREFIX
 155 #define xxN_PREFIX "\\_SB.PCI0.SBRG.EC0."
 156
 157 static struct model_data model_conf[END_MODEL] = {
 158         /*
 159          * TODO I have seen a SWBX and AIBX method on some models, like L1400B,
 160          * it seems to be a kind of switch, but what for ?
 161          */
 162
 163         {
 164          .name = "A1x",
 165          .mt_mled = "MLED",
 166          .mled_status = "\\MAIL",
 167          .mt_lcd_switch = A1x_PREFIX "_Q10",
 168          .lcd_status = "\\BKLI",
 169          .brightness_up = A1x_PREFIX "_Q0E",
 170          .brightness_down = A1x_PREFIX "_Q0F"},
 171
 172         {
 173          .name = "A2x",
 174          .mt_mled = "MLED",
 175          .mt_wled = "WLED",
 176          .wled_status = "\\SG66",
 177          .mt_lcd_switch = "\\Q10",
 178          .lcd_status = "\\BAOF",
 179          .brightness_set = "SPLV",
 180          .brightness_get = "GPLV",
 181          .display_set = "SDSP",
 182          .display_get = "\\INFB"},
 183
 184         {
 185          .name = "A4G",
 186          .mt_mled = "MLED",
 187 /* WLED present, but not controlled by ACPI */
 188          .mt_lcd_switch = xxN_PREFIX "_Q10",
 189          .brightness_set = "SPLV",
 190          .brightness_get = "GPLV",
 191          .display_set = "SDSP",
 192          .display_get = "\\ADVG"},
 193
 194         {
 195          .name = "D1x",
 196          .mt_mled = "MLED",
 197          .mt_lcd_switch = "\\Q0D",
 198          .lcd_status = "\\GP11",
 199          .brightness_up = "\\Q0C",
 200          .brightness_down = "\\Q0B",
 201          .brightness_status = "\\BLVL",
 202          .display_set = "SDSP",
 203          .display_get = "\\INFB"},
 204
 205         {
 206          .name = "L2D",
 207          .mt_mled = "MLED",
 208          .mled_status = "\\SGP6",
 209          .mt_wled = "WLED",
 210          .wled_status = "\\RCP3",
 211          .mt_lcd_switch = "\\Q10",
 212          .lcd_status = "\\SGP0",
 213          .brightness_up = "\\Q0E",
 214          .brightness_down = "\\Q0F",
 215          .display_set = "SDSP",
 216          .display_get = "\\INFB"},
 217
 218         {
 219          .name = "L3C",
 220          .mt_mled = "MLED",
 221          .mt_wled = "WLED",
 222          .mt_lcd_switch = L3C_PREFIX "_Q10",
 223          .lcd_status = "\\GL32",
 224          .brightness_set = "SPLV",
 225          .brightness_get = "GPLV",
 226          .display_set = "SDSP",
 227          .display_get = "\\_SB.PCI0.PCI1.VGAC.NMAP"},
 228
 229         {
 230          .name = "L3D",
 231          .mt_mled = "MLED",
 232          .mled_status = "\\MALD",
 233          .mt_wled = "WLED",
 234          .mt_lcd_switch = "\\Q10",
 235          .lcd_status = "\\BKLG",
 236          .brightness_set = "SPLV",
 237          .brightness_get = "GPLV",
 238          .display_set = "SDSP",
 239          .display_get = "\\INFB"},
 240
 241         {
 242          .name = "L3H",
 243          .mt_mled = "MLED",
 244          .mt_wled = "WLED",
 245          .mt_lcd_switch = "EHK",
 246          .lcd_status = "\\_SB.PCI0.PM.PBC",
 247          .brightness_set = "SPLV",
 248          .brightness_get = "GPLV",
 249          .display_set = "SDSP",
 250          .display_get = "\\INFB"},
 251
 252         {
 253          .name = "L4R",
 254          .mt_mled = "MLED",
 255          .mt_wled = "WLED",
 256          .wled_status = "\\_SB.PCI0.SBRG.SG13",
 257          .mt_lcd_switch = xxN_PREFIX "_Q10",
 258          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
 259          .brightness_set = "SPLV",
 260          .brightness_get = "GPLV",
 261          .display_set = "SDSP",
 262          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
 263
 264         {
 265          .name = "L5x",
 266          .mt_mled = "MLED",
 267 /* WLED present, but not controlled by ACPI */
 268          .mt_tled = "TLED",
 269          .mt_lcd_switch = "\\Q0D",
 270          .lcd_status = "\\BAOF",
 271          .brightness_set = "SPLV",
 272          .brightness_get = "GPLV",
 273          .display_set = "SDSP",
 274          .display_get = "\\INFB"},
 275
 276         {
 277          .name = "L8L"
 278 /* No features, but at least support the hotkeys */
 279          },
 280
 281         {
 282          .name = "M1A",
 283          .mt_mled = "MLED",
 284          .mt_lcd_switch = M1A_PREFIX "Q10",
 285          .lcd_status = "\\PNOF",
 286          .brightness_up = M1A_PREFIX "Q0E",
 287          .brightness_down = M1A_PREFIX "Q0F",
 288          .brightness_status = "\\BRIT",
 289          .display_set = "SDSP",
 290          .display_get = "\\INFB"},
 291
 292         {
 293          .name = "M2E",
 294          .mt_mled = "MLED",
 295          .mt_wled = "WLED",
 296          .mt_lcd_switch = "\\Q10",
 297          .lcd_status = "\\GP06",
 298          .brightness_set = "SPLV",
 299          .brightness_get = "GPLV",
 300          .display_set = "SDSP",
 301          .display_get = "\\INFB"},
 302
 303         {
 304          .name = "M6N",
 305          .mt_mled = "MLED",
 306          .mt_wled = "WLED",
 307          .wled_status = "\\_SB.PCI0.SBRG.SG13",
 308          .mt_lcd_switch = xxN_PREFIX "_Q10",
 309          .lcd_status = "\\_SB.BKLT",
 310          .brightness_set = "SPLV",
 311          .brightness_get = "GPLV",
 312          .display_set = "SDSP",
 313          .display_get = "\\SSTE"},
 314
 315         {
 316          .name = "M6R",
 317          .mt_mled = "MLED",
 318          .mt_wled = "WLED",
 319          .mt_lcd_switch = xxN_PREFIX "_Q10",
 320          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
 321          .brightness_set = "SPLV",
 322          .brightness_get = "GPLV",
 323          .display_set = "SDSP",
 324          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
 325
 326         {
 327          .name = "P30",
 328          .mt_wled = "WLED",
 329          .mt_lcd_switch = P30_PREFIX "_Q0E",
 330          .lcd_status = "\\BKLT",
 331          .brightness_up = P30_PREFIX "_Q68",
 332          .brightness_down = P30_PREFIX "_Q69",
 333          .brightness_get = "GPLV",
 334          .display_set = "SDSP",
 335          .display_get = "\\DNXT"},
 336
 337         {
 338          .name = "S1x",
 339          .mt_mled = "MLED",
 340          .mled_status = "\\EMLE",
 341          .mt_wled = "WLED",
 342          .mt_lcd_switch = S1x_PREFIX "Q10",
 343          .lcd_status = "\\PNOF",
 344          .brightness_set = "SPLV",
 345          .brightness_get = "GPLV"},
 346
 347         {
 348          .name = "S2x",
 349          .mt_mled = "MLED",
 350          .mled_status = "\\MAIL",
 351          .mt_lcd_switch = S2x_PREFIX "_Q10",
 352          .lcd_status = "\\BKLI",
 353          .brightness_up = S2x_PREFIX "_Q0B",
 354          .brightness_down = S2x_PREFIX "_Q0A"},
 355
 356         {
 357          .name = "W1N",
 358          .mt_mled = "MLED",
 359          .mt_wled = "WLED",
 360          .mt_ledd = "SLCM",
 361          .mt_lcd_switch = xxN_PREFIX "_Q10",
 362          .lcd_status = "\\BKLT",
 363          .brightness_set = "SPLV",
 364          .brightness_get = "GPLV",
 365          .display_set = "SDSP",
 366          .display_get = "\\ADVG"},
 367
 368         {
 369          .name = "W5A",
 370          .mt_bt_switch = "BLED",
 371          .mt_wled = "WLED",
 372          .mt_lcd_switch = xxN_PREFIX "_Q10",
 373          .brightness_set = "SPLV",
 374          .brightness_get = "GPLV",
 375          .display_set = "SDSP",
 376          .display_get = "\\ADVG"},
 377
 378         {
 379          .name = "xxN",
 380          .mt_mled = "MLED",
 381 /* WLED present, but not controlled by ACPI */
 382          .mt_lcd_switch = xxN_PREFIX "_Q10",
 383          .lcd_status = "\\BKLT",
 384          .brightness_set = "SPLV",
 385          .brightness_get = "GPLV",
 386          .display_set = "SDSP",
 387          .display_get = "\\ADVG"}
 388 };
 389
 390 /* procdir we use */
 391 static struct proc_dir_entry *asus_proc_dir;
 392
 393 /*
 394  * This header is made available to allow proper configuration given model,
 395  * revision number , ... this info cannot go in struct asus_hotk because it is
 396  * available before the hotk
 397  */
 398 static struct acpi_table_header *asus_info;
 399
 400 /* The actual device the driver binds to */
 401 static struct asus_hotk *hotk;
 402
 403 /*
 404  * The hotkey driver declaration
 405  */
 406 static int asus_hotk_add(struct acpi_device *device);
 407 static int asus_hotk_remove(struct acpi_device *device, int type);
 408 static struct acpi_driver asus_hotk_driver = {
 409         .name = ACPI_HOTK_NAME,
 410         .class = ACPI_HOTK_CLASS,
 411         .ids = ACPI_HOTK_HID,
 412         .ops = {
 413                 .add = asus_hotk_add,
 414                 .remove = asus_hotk_remove,
 415                 },
 416 };
 417
 418 /*
 419  * This function evaluates an ACPI method, given an int as parameter, the
 420  * method is searched within the scope of the handle, can be NULL. The output
 421  * of the method is written is output, which can also be NULL
 422  *
 423  * returns 1 if write is successful, 0 else.
 424  */
 425 static int write_acpi_int(acpi_handle handle, const char *method, int val,
 426                           struct acpi_buffer *output)
 427 {
 428         struct acpi_object_list params; //list of input parameters (an int here)
 429         union acpi_object in_obj;       //the only param we use
 430         acpi_status status;
 431
 432         params.count = 1;
 433         params.pointer = &in_obj;
 434         in_obj.type = ACPI_TYPE_INTEGER;
 435         in_obj.integer.value = val;
 436
 437         status = acpi_evaluate_object(handle, (char *)method, &params, output);
 438         return (status == AE_OK);
 439 }
 440
 441 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
 442 {
 443         struct acpi_buffer output;
 444         union acpi_object out_obj;
 445         acpi_status status;
 446
 447         output.length = sizeof(out_obj);
 448         output.pointer = &out_obj;
 449
 450         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
 451         *val = out_obj.integer.value;
 452         return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
 453 }
 454
 455 /*
 456  * We write our info in page, we begin at offset off and cannot write more
 457  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 458  * number of bytes written in page
 459  */
 460 static int
 461 proc_read_info(char *page, char **start, off_t off, int count, int *eof,
 462                void *data)
 463 {
 464         int len = 0;
 465         int temp;
 466         char buf[16];           //enough for all info
 467         /*
 468          * We use the easy way, we don't care of off and count, so we don't set eof
 469          * to 1
 470          */
 471
 472         len += sprintf(page, ACPI_HOTK_NAME " " ASUS_ACPI_VERSION "\n");
 473         len += sprintf(page + len, "Model reference    : %s\n",
 474                        hotk->methods->name);
 475         /*
 476          * The SFUN method probably allows the original driver to get the list
 477          * of features supported by a given model. For now, 0x0100 or 0x0800
 478          * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
 479          * The significance of others is yet to be found.
 480          */
 481         if (read_acpi_int(hotk->handle, "SFUN", &temp))
 482                 len +=
 483                     sprintf(page + len, "SFUN value         : 0x%04x\n", temp);
 484         /*
 485          * Another value for userspace: the ASYM method returns 0x02 for
 486          * battery low and 0x04 for battery critical, its readings tend to be
 487          * more accurate than those provided by _BST.
 488          * Note: since not all the laptops provide this method, errors are
 489          * silently ignored.
 490          */
 491         if (read_acpi_int(hotk->handle, "ASYM", &temp))
 492                 len +=
 493                     sprintf(page + len, "ASYM value         : 0x%04x\n", temp);
 494         if (asus_info) {
 495                 snprintf(buf, 16, "%d", asus_info->length);
 496                 len += sprintf(page + len, "DSDT length        : %s\n", buf);
 497                 snprintf(buf, 16, "%d", asus_info->checksum);
 498                 len += sprintf(page + len, "DSDT checksum      : %s\n", buf);
 499                 snprintf(buf, 16, "%d", asus_info->revision);
 500                 len += sprintf(page + len, "DSDT revision      : %s\n", buf);
 501                 snprintf(buf, 7, "%s", asus_info->oem_id);
 502                 len += sprintf(page + len, "OEM id             : %s\n", buf);
 503                 snprintf(buf, 9, "%s", asus_info->oem_table_id);
 504                 len += sprintf(page + len, "OEM table id       : %s\n", buf);
 505                 snprintf(buf, 16, "%x", asus_info->oem_revision);
 506                 len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);
 507                 snprintf(buf, 5, "%s", asus_info->asl_compiler_id);
 508                 len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
 509                 snprintf(buf, 16, "%x", asus_info->asl_compiler_revision);
 510                 len += sprintf(page + len, "ASL comp revision  : 0x%s\n", buf);
 511         }
 512
 513         return len;
 514 }
 515
 516 /*
 517  * /proc handlers
 518  * We write our info in page, we begin at offset off and cannot write more
 519  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 520  * number of bytes written in page
 521  */
 522
 523 /* Generic LED functions */
 524 static int read_led(const char *ledname, int ledmask)
 525 {
 526         if (ledname) {
 527                 int led_status;
 528
 529                 if (read_acpi_int(NULL, ledname, &led_status))
 530                         return led_status;
 531                 else
 532                         printk(KERN_WARNING "Asus ACPI: Error reading LED "
 533                                "status\n");
 534         }
 535         return (hotk->status & ledmask) ? 1 : 0;
 536 }
 537
 538 static int parse_arg(const char __user * buf, unsigned long count, int *val)
 539 {
 540         char s[32];
 541         if (!count)
 542                 return 0;
 543         if (count > 31)
 544                 return -EINVAL;
 545         if (copy_from_user(s, buf, count))
 546                 return -EFAULT;
 547         s[count] = 0;
 548         if (sscanf(s, "%i", val) != 1)
 549                 return -EINVAL;
 550         return count;
 551 }
 552
 553 /* FIXME: kill extraneous args so it can be called independently */
 554 static int
 555 write_led(const char __user * buffer, unsigned long count,
 556           char *ledname, int ledmask, int invert)
 557 {
 558         int value;
 559         int led_out = 0;
 560
 561         count = parse_arg(buffer, count, &value);
 562         if (count > 0)
 563                 led_out = value ? 1 : 0;
 564
 565         hotk->status =
 566             (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);
 567
 568         if (invert)             /* invert target value */
 569                 led_out = !led_out & 0x1;
 570
 571         if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
 572                 printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",
 573                        ledname);
 574
 575         return count;
 576 }
 577
 578 /*
 579  * Proc handlers for MLED
 580  */
 581 static int
 582 proc_read_mled(char *page, char **start, off_t off, int count, int *eof,
 583                void *data)
 584 {
 585         return sprintf(page, "%d\n",
 586                        read_led(hotk->methods->mled_status, MLED_ON));
 587 }
 588
 589 static int
 590 proc_write_mled(struct file *file, const char __user * buffer,
 591                 unsigned long count, void *data)
 592 {
 593         return write_led(buffer, count, hotk->methods->mt_mled, MLED_ON, 1);
 594 }
 595
 596 /*
 597  * Proc handlers for LED display
 598  */
 599 static int
 600 proc_read_ledd(char *page, char **start, off_t off, int count, int *eof,
 601                void *data)
 602 {
 603         return sprintf(page, "0x%08x\n", hotk->ledd_status);
 604 }
 605
 606 static int
 607 proc_write_ledd(struct file *file, const char __user * buffer,
 608                 unsigned long count, void *data)
 609 {
 610         int value;
 611
 612         count = parse_arg(buffer, count, &value);
 613         if (count > 0) {
 614                 if (!write_acpi_int
 615                     (hotk->handle, hotk->methods->mt_ledd, value, NULL))
 616                         printk(KERN_WARNING
 617                                "Asus ACPI: LED display write failed\n");
 618                 else
 619                         hotk->ledd_status = (u32) value;
 620         } else if (count < 0)
 621                 printk(KERN_WARNING "Asus ACPI: Error reading user input\n");
 622
 623         return count;
 624 }
 625
 626 /*
 627  * Proc handlers for WLED
 628  */
 629 static int
 630 proc_read_wled(char *page, char **start, off_t off, int count, int *eof,
 631                void *data)
 632 {
 633         return sprintf(page, "%d\n",
 634                        read_led(hotk->methods->wled_status, WLED_ON));
 635 }
 636
 637 static int
 638 proc_write_wled(struct file *file, const char __user * buffer,
 639                 unsigned long count, void *data)
 640 {
 641         return write_led(buffer, count, hotk->methods->mt_wled, WLED_ON, 0);
 642 }
 643
 644 /*
 645  * Proc handlers for Bluetooth
 646  */
 647 static int
 648 proc_read_bluetooth(char *page, char **start, off_t off, int count, int *eof,
 649                     void *data)
 650 {
 651         return sprintf(page, "%d\n", read_led(hotk->methods->bt_status, BT_ON));
 652 }
 653
 654 static int
 655 proc_write_bluetooth(struct file *file, const char __user * buffer,
 656                      unsigned long count, void *data)
 657 {
 658         /* Note: mt_bt_switch controls both internal Bluetooth adapter's
 659            presence and its LED */
 660         return write_led(buffer, count, hotk->methods->mt_bt_switch, BT_ON, 0);
 661 }
 662
 663 /*
 664  * Proc handlers for TLED
 665  */
 666 static int
 667 proc_read_tled(char *page, char **start, off_t off, int count, int *eof,
 668                void *data)
 669 {
 670         return sprintf(page, "%d\n",
 671                        read_led(hotk->methods->tled_status, TLED_ON));
 672 }
 673
 674 static int
 675 proc_write_tled(struct file *file, const char __user * buffer,
 676                 unsigned long count, void *data)
 677 {
 678         return write_led(buffer, count, hotk->methods->mt_tled, TLED_ON, 0);
 679 }
 680
 681 static int get_lcd_state(void)
 682 {
 683         int lcd = 0;
 684
 685         if (hotk->model != L3H) {
 686                 /* We don't have to check anything if we are here */
 687                 if (!read_acpi_int(NULL, hotk->methods->lcd_status, &lcd))
 688                         printk(KERN_WARNING
 689                                "Asus ACPI: Error reading LCD status\n");
 690
 691                 if (hotk->model == L2D)
 692                         lcd = ~lcd;
 693         } else {                /* L3H and the like have to be handled differently */
 694                 acpi_status status = 0;
 695                 struct acpi_object_list input;
 696                 union acpi_object mt_params[2];
 697                 struct acpi_buffer output;
 698                 union acpi_object out_obj;
 699
 700                 input.count = 2;
 701                 input.pointer = mt_params;
 702                 /* Note: the following values are partly guessed up, but
 703                    otherwise they seem to work */
 704                 mt_params[0].type = ACPI_TYPE_INTEGER;
 705                 mt_params[0].integer.value = 0x02;
 706                 mt_params[1].type = ACPI_TYPE_INTEGER;
 707                 mt_params[1].integer.value = 0x02;
 708
 709                 output.length = sizeof(out_obj);
 710                 output.pointer = &out_obj;
 711
 712                 status =
 713                     acpi_evaluate_object(NULL, hotk->methods->lcd_status,
 714                                          &input, &output);
 715                 if (status != AE_OK)
 716                         return -1;
 717                 if (out_obj.type == ACPI_TYPE_INTEGER)
 718                         /* That's what the AML code does */
 719                         lcd = out_obj.integer.value >> 8;
 720         }
 721
 722         return (lcd & 1);
 723 }
 724
 725 static int set_lcd_state(int value)
 726 {
 727         int lcd = 0;
 728         acpi_status status = 0;
 729
 730         lcd = value ? 1 : 0;
 731         if (lcd != get_lcd_state()) {
 732                 /* switch */
 733                 if (hotk->model != L3H) {
 734                         status =
 735                             acpi_evaluate_object(NULL,
 736                                                  hotk->methods->mt_lcd_switch,
 737                                                  NULL, NULL);
 738                 } else {        /* L3H and the like have to be handled differently */
 739                         if (!write_acpi_int
 740                             (hotk->handle, hotk->methods->mt_lcd_switch, 0x07,
 741                              NULL))
 742                                 status = AE_ERROR;
 743                         /* L3H's AML executes EHK (0x07) upon Fn+F7 keypress,
 744                            the exact behaviour is simulated here */
 745                 }
 746                 if (ACPI_FAILURE(status))
 747                         printk(KERN_WARNING "Asus ACPI: Error switching LCD\n");
 748         }
 749         return 0;
 750
 751 }
 752
 753 static int
 754 proc_read_lcd(char *page, char **start, off_t off, int count, int *eof,
 755               void *data)
 756 {
 757         return sprintf(page, "%d\n", get_lcd_state());
 758 }
 759
 760 static int
 761 proc_write_lcd(struct file *file, const char __user * buffer,
 762                unsigned long count, void *data)
 763 {
 764         int value;
 765
 766         count = parse_arg(buffer, count, &value);
 767         if (count > 0)
 768                 set_lcd_state(value);
 769         return count;
 770 }
 771
 772 static int read_brightness(void)
 773 {
 774         int value;
 775
 776         if (hotk->methods->brightness_get) {    /* SPLV/GPLV laptop */
 777                 if (!read_acpi_int(hotk->handle, hotk->methods->brightness_get,
 778                                    &value))
 779                         printk(KERN_WARNING
 780                                "Asus ACPI: Error reading brightness\n");
 781         } else if (hotk->methods->brightness_status) {  /* For D1 for example */
 782                 if (!read_acpi_int(NULL, hotk->methods->brightness_status,
 783                                    &value))
 784                         printk(KERN_WARNING
 785                                "Asus ACPI: Error reading brightness\n");
 786         } else                  /* No GPLV method */
 787                 value = hotk->brightness;
 788         return value;
 789 }
 790
 791 /*
 792  * Change the brightness level
 793  */
 794 static void set_brightness(int value)
 795 {
 796         acpi_status status = 0;
 797
 798         /* SPLV laptop */
 799         if (hotk->methods->brightness_set) {
 800                 if (!write_acpi_int(hotk->handle, hotk->methods->brightness_set,
 801                                     value, NULL))
 802                         printk(KERN_WARNING
 803                                "Asus ACPI: Error changing brightness\n");
 804                 return;
 805         }
 806
 807         /* No SPLV method if we are here, act as appropriate */
 808         value -= read_brightness();
 809         while (value != 0) {
 810                 status = acpi_evaluate_object(NULL, (value > 0) ?
 811                                               hotk->methods->brightness_up :
 812                                               hotk->methods->brightness_down,
 813                                               NULL, NULL);
 814                 (value > 0) ? value-- : value++;
 815                 if (ACPI_FAILURE(status))
 816                         printk(KERN_WARNING
 817                                "Asus ACPI: Error changing brightness\n");
 818         }
 819         return;
 820 }
 821
 822 static int
 823 proc_read_brn(char *page, char **start, off_t off, int count, int *eof,
 824               void *data)
 825 {
 826         return sprintf(page, "%d\n", read_brightness());
 827 }
 828
 829 static int
 830 proc_write_brn(struct file *file, const char __user * buffer,
 831                unsigned long count, void *data)
 832 {
 833         int value;
 834
 835         count = parse_arg(buffer, count, &value);
 836         if (count > 0) {
 837                 value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
 838                 /* 0 <= value <= 15 */
 839                 set_brightness(value);
 840         } else if (count < 0) {
 841                 printk(KERN_WARNING "Asus ACPI: Error reading user input\n");
 842         }
 843
 844         return count;
 845 }
 846
 847 static void set_display(int value)
 848 {
 849         /* no sanity check needed for now */
 850         if (!write_acpi_int(hotk->handle, hotk->methods->display_set,
 851                             value, NULL))
 852                 printk(KERN_WARNING "Asus ACPI: Error setting display\n");
 853         return;
 854 }
 855
 856 /*
 857  * Now, *this* one could be more user-friendly, but so far, no-one has
 858  * complained. The significance of bits is the same as in proc_write_disp()
 859  */
 860 static int
 861 proc_read_disp(char *page, char **start, off_t off, int count, int *eof,
 862                void *data)
 863 {
 864         int value = 0;
 865
 866         if (!read_acpi_int(hotk->handle, hotk->methods->display_get, &value))
 867                 printk(KERN_WARNING
 868                        "Asus ACPI: Error reading display status\n");
 869         value &= 0x07;          /* needed for some models, shouldn't hurt others */
 870         return sprintf(page, "%d\n", value);
 871 }
 872
 873 /*
 874  * Experimental support for display switching. As of now: 1 should activate
 875  * the LCD output, 2 should do for CRT, and 4 for TV-Out. Any combination
 876  * (bitwise) of these will suffice. I never actually tested 3 displays hooked up
 877  * simultaneously, so be warned. See the acpi4asus README for more info.
 878  */
 879 static int
 880 proc_write_disp(struct file *file, const char __user * buffer,
 881                 unsigned long count, void *data)
 882 {
 883         int value;
 884
 885         count = parse_arg(buffer, count, &value);
 886         if (count > 0)
 887                 set_display(value);
 888         else if (count < 0)
 889                 printk(KERN_WARNING "Asus ACPI: Error reading user input\n");
 890
 891         return count;
 892 }
 893
 894 typedef int (proc_readfunc) (char *page, char **start, off_t off, int count,
 895                              int *eof, void *data);
 896 typedef int (proc_writefunc) (struct file * file, const char __user * buffer,
 897                               unsigned long count, void *data);
 898
 899 static int
 900 asus_proc_add(char *name, proc_writefunc * writefunc,
 901                      proc_readfunc * readfunc, mode_t mode,
 902                      struct acpi_device *device)
 903 {
 904         struct proc_dir_entry *proc =
 905             create_proc_entry(name, mode, acpi_device_dir(device));
 906         if (!proc) {
 907                 printk(KERN_WARNING "  Unable to create %s fs entry\n", name);
 908                 return -1;
 909         }
 910         proc->write_proc = writefunc;
 911         proc->read_proc = readfunc;
 912         proc->data = acpi_driver_data(device);
 913         proc->owner = THIS_MODULE;
 914         proc->uid = asus_uid;
 915         proc->gid = asus_gid;
 916         return 0;
 917 }
 918
 919 static int asus_hotk_add_fs(struct acpi_device *device)
 920 {
 921         struct proc_dir_entry *proc;
 922         mode_t mode;
 923
 924         /*
 925          * If parameter uid or gid is not changed, keep the default setting for
 926          * our proc entries (-rw-rw-rw-) else, it means we care about security,
 927          * and then set to -rw-rw----
 928          */
 929
 930         if ((asus_uid == 0) && (asus_gid == 0)) {
 931                 mode = S_IFREG | S_IRUGO | S_IWUGO;
 932         } else {
 933                 mode = S_IFREG | S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
 934                 printk(KERN_WARNING "  asus_uid and asus_gid parameters are "
 935                        "deprecated, use chown and chmod instead!\n");
 936         }
 937
 938         acpi_device_dir(device) = asus_proc_dir;
 939         if (!acpi_device_dir(device))
 940                 return -ENODEV;
 941
 942         proc = create_proc_entry(PROC_INFO, mode, acpi_device_dir(device));
 943         if (proc) {
 944                 proc->read_proc = proc_read_info;
 945                 proc->data = acpi_driver_data(device);
 946                 proc->owner = THIS_MODULE;
 947                 proc->uid = asus_uid;
 948                 proc->gid = asus_gid;
 949         } else {
 950                 printk(KERN_WARNING "  Unable to create " PROC_INFO
 951                        " fs entry\n");
 952         }
 953
 954         if (hotk->methods->mt_wled) {
 955                 asus_proc_add(PROC_WLED, &proc_write_wled, &proc_read_wled,
 956                               mode, device);
 957         }
 958
 959         if (hotk->methods->mt_ledd) {
 960                 asus_proc_add(PROC_LEDD, &proc_write_ledd, &proc_read_ledd,
 961                               mode, device);
 962         }
 963
 964         if (hotk->methods->mt_mled) {
 965                 asus_proc_add(PROC_MLED, &proc_write_mled, &proc_read_mled,
 966                               mode, device);
 967         }
 968
 969         if (hotk->methods->mt_tled) {
 970                 asus_proc_add(PROC_TLED, &proc_write_tled, &proc_read_tled,
 971                               mode, device);
 972         }
 973
 974         if (hotk->methods->mt_bt_switch) {
 975                 asus_proc_add(PROC_BT, &proc_write_bluetooth,
 976                               &proc_read_bluetooth, mode, device);
 977         }
 978
 979         /*
 980          * We need both read node and write method as LCD switch is also accessible
 981          * from keyboard
 982          */
 983         if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status) {
 984                 asus_proc_add(PROC_LCD, &proc_write_lcd, &proc_read_lcd, mode,
 985                               device);
 986         }
 987
 988         if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
 989             (hotk->methods->brightness_get && hotk->methods->brightness_set)) {
 990                 asus_proc_add(PROC_BRN, &proc_write_brn, &proc_read_brn, mode,
 991                               device);
 992         }
 993
 994         if (hotk->methods->display_set) {
 995                 asus_proc_add(PROC_DISP, &proc_write_disp, &proc_read_disp,
 996                               mode, device);
 997         }
 998
 999         return 0;
1000 }
1001
1002 static int asus_hotk_remove_fs(struct acpi_device *device)
1003 {
1004         if (acpi_device_dir(device)) {
1005                 remove_proc_entry(PROC_INFO, acpi_device_dir(device));
1006                 if (hotk->methods->mt_wled)
1007                         remove_proc_entry(PROC_WLED, acpi_device_dir(device));
1008                 if (hotk->methods->mt_mled)
1009                         remove_proc_entry(PROC_MLED, acpi_device_dir(device));
1010                 if (hotk->methods->mt_tled)
1011                         remove_proc_entry(PROC_TLED, acpi_device_dir(device));
1012                 if (hotk->methods->mt_ledd)
1013                         remove_proc_entry(PROC_LEDD, acpi_device_dir(device));
1014                 if (hotk->methods->mt_bt_switch)
1015                         remove_proc_entry(PROC_BT, acpi_device_dir(device));
1016                 if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status)
1017                         remove_proc_entry(PROC_LCD, acpi_device_dir(device));
1018                 if ((hotk->methods->brightness_up
1019                      && hotk->methods->brightness_down)
1020                     || (hotk->methods->brightness_get
1021                         && hotk->methods->brightness_set))
1022                         remove_proc_entry(PROC_BRN, acpi_device_dir(device));
1023                 if (hotk->methods->display_set)
1024                         remove_proc_entry(PROC_DISP, acpi_device_dir(device));
1025         }
1026         return 0;
1027 }
1028
1029 static void asus_hotk_notify(acpi_handle handle, u32 event, void *data)
1030 {
1031         /* TODO Find a better way to handle events count. */
1032         if (!hotk)
1033                 return;
1034
1035         if ((event & ~((u32) BR_UP)) < 16) {
1036                 hotk->brightness = (event & ~((u32) BR_UP));
1037         } else if ((event & ~((u32) BR_DOWN)) < 16) {
1038                 hotk->brightness = (event & ~((u32) BR_DOWN));
1039         }
1040
1041         acpi_bus_generate_event(hotk->device, event,
1042                                 hotk->event_count[event % 128]++);
1043
1044         return;
1045 }
1046
1047 /*
1048  * Match the model string to the list of supported models. Return END_MODEL if
1049  * no match or model is NULL.
1050  */
1051 static int asus_model_match(char *model)
1052 {
1053         if (model == NULL)
1054                 return END_MODEL;
1055
1056         if (strncmp(model, "L3D", 3) == 0)
1057                 return L3D;
1058         else if (strncmp(model, "L2E", 3) == 0 ||
1059                  strncmp(model, "L3H", 3) == 0 || strncmp(model, "L5D", 3) == 0)
1060                 return L3H;
1061         else if (strncmp(model, "L3", 2) == 0 || strncmp(model, "L2B", 3) == 0)
1062                 return L3C;
1063         else if (strncmp(model, "L8L", 3) == 0)
1064                 return L8L;
1065         else if (strncmp(model, "L4R", 3) == 0)
1066                 return L4R;
1067         else if (strncmp(model, "M6N", 3) == 0 || strncmp(model, "W3N", 3) == 0)
1068                 return M6N;
1069         else if (strncmp(model, "M6R", 3) == 0 || strncmp(model, "A3G", 3) == 0)
1070                 return M6R;
1071         else if (strncmp(model, "M2N", 3) == 0 ||
1072                  strncmp(model, "M3N", 3) == 0 ||
1073                  strncmp(model, "M5N", 3) == 0 ||
1074                  strncmp(model, "M6N", 3) == 0 ||
1075                  strncmp(model, "S1N", 3) == 0 ||
1076                  strncmp(model, "S5N", 3) == 0 || strncmp(model, "W1N", 3) == 0)
1077                 return xxN;
1078         else if (strncmp(model, "M1", 2) == 0)
1079                 return M1A;
1080         else if (strncmp(model, "M2", 2) == 0 || strncmp(model, "L4E", 3) == 0)
1081                 return M2E;
1082         else if (strncmp(model, "L2", 2) == 0)
1083                 return L2D;
1084         else if (strncmp(model, "L8", 2) == 0)
1085                 return S1x;
1086         else if (strncmp(model, "D1", 2) == 0)
1087                 return D1x;
1088         else if (strncmp(model, "A1", 2) == 0)
1089                 return A1x;
1090         else if (strncmp(model, "A2", 2) == 0)
1091                 return A2x;
1092         else if (strncmp(model, "J1", 2) == 0)
1093                 return S2x;
1094         else if (strncmp(model, "L5", 2) == 0)
1095                 return L5x;
1096         else if (strncmp(model, "A4G", 3) == 0)
1097                 return A4G;
1098         else if (strncmp(model, "W1N", 3) == 0)
1099                 return W1N;
1100         else if (strncmp(model, "W5A", 3) == 0)
1101                 return W5A;
1102         else
1103                 return END_MODEL;
1104 }
1105
1106 /*
1107  * This function is used to initialize the hotk with right values. In this
1108  * method, we can make all the detection we want, and modify the hotk struct
1109  */
1110 static int asus_hotk_get_info(void)
1111 {
1112         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1113         struct acpi_buffer dsdt = { ACPI_ALLOCATE_BUFFER, NULL };
1114         union acpi_object *model = NULL;
1115         int bsts_result;
1116         char *string = NULL;
1117         acpi_status status;
1118
1119         /*
1120          * Get DSDT headers early enough to allow for differentiating between
1121          * models, but late enough to allow acpi_bus_register_driver() to fail
1122          * before doing anything ACPI-specific. Should we encounter a machine,
1123          * which needs special handling (i.e. its hotkey device has a different
1124          * HID), this bit will be moved. A global variable asus_info contains
1125          * the DSDT header.
1126          */
1127         status = acpi_get_table(ACPI_TABLE_ID_DSDT, 1, &dsdt);
1128         if (ACPI_FAILURE(status))
1129                 printk(KERN_WARNING "  Couldn't get the DSDT table header\n");
1130         else
1131                 asus_info = (struct acpi_table_header *)dsdt.pointer;
1132
1133         /* We have to write 0 on init this far for all ASUS models */
1134         if (!write_acpi_int(hotk->handle, "INIT", 0, &buffer)) {
1135                 printk(KERN_ERR "  Hotkey initialization failed\n");
1136                 return -ENODEV;
1137         }
1138
1139         /* This needs to be called for some laptops to init properly */
1140         if (!read_acpi_int(hotk->handle, "BSTS", &bsts_result))
1141                 printk(KERN_WARNING "  Error calling BSTS\n");
1142         else if (bsts_result)
1143                 printk(KERN_NOTICE "  BSTS called, 0x%02x returned\n",
1144                        bsts_result);
1145
1146         /*
1147          * Try to match the object returned by INIT to the specific model.
1148          * Handle every possible object (or the lack of thereof) the DSDT
1149          * writers might throw at us. When in trouble, we pass NULL to
1150          * asus_model_match() and try something completely different.
1151          */
1152         if (buffer.pointer) {
1153                 model = (union acpi_object *)buffer.pointer;
1154                 switch (model->type) {
1155                 case ACPI_TYPE_STRING:
1156                         string = model->string.pointer;
1157                         break;
1158                 case ACPI_TYPE_BUFFER:
1159                         string = model->buffer.pointer;
1160                         break;
1161                 default:
1162                         kfree(model);
1163                         break;
1164                 }
1165         }
1166         hotk->model = asus_model_match(string);
1167         if (hotk->model == END_MODEL) { /* match failed */
1168                 if (asus_info &&
1169                     strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) {
1170                         hotk->model = P30;
1171                         printk(KERN_NOTICE
1172                                "  Samsung P30 detected, supported\n");
1173                 } else {
1174                         hotk->model = M2E;
1175                         printk(KERN_NOTICE "  unsupported model %s, trying "
1176                                "default values\n", string);
1177                         printk(KERN_NOTICE
1178                                "  send /proc/acpi/dsdt to the developers\n");
1179                 }
1180                 hotk->methods = &model_conf[hotk->model];
1181                 return AE_OK;
1182         }
1183         hotk->methods = &model_conf[hotk->model];
1184         printk(KERN_NOTICE "  %s model detected, supported\n", string);
1185
1186         /* Sort of per-model blacklist */
1187         if (strncmp(string, "L2B", 3) == 0)
1188                 hotk->methods->lcd_status = NULL;
1189         /* L2B is similar enough to L3C to use its settings, with this only
1190            exception */
1191         else if (strncmp(string, "A3G", 3) == 0)
1192                 hotk->methods->lcd_status = "\\BLFG";
1193         /* A3G is like M6R */
1194         else if (strncmp(string, "S5N", 3) == 0 ||
1195                  strncmp(string, "M5N", 3) == 0 ||
1196                  strncmp(string, "W3N", 3) == 0)
1197                 hotk->methods->mt_mled = NULL;
1198         /* S5N, M5N and W3N have no MLED */
1199         else if (strncmp(string, "L5D", 3) == 0)
1200                 hotk->methods->mt_wled = NULL;
1201         /* L5D's WLED is not controlled by ACPI */
1202         else if (strncmp(string, "M2N", 3) == 0 ||
1203                  strncmp(string, "S1N", 3) == 0)
1204                 hotk->methods->mt_wled = "WLED";
1205         /* M2N and S1N have a usable WLED */
1206         else if (asus_info) {
1207                 if (strncmp(asus_info->oem_table_id, "L1", 2) == 0)
1208                         hotk->methods->mled_status = NULL;
1209                 /* S1300A reports L84F, but L1400B too, account for that */
1210         }
1211
1212         kfree(model);
1213
1214         return AE_OK;
1215 }
1216
1217 static int asus_hotk_check(void)
1218 {
1219         int result = 0;
1220
1221         result = acpi_bus_get_status(hotk->device);
1222         if (result)
1223                 return result;
1224
1225         if (hotk->device->status.present) {
1226                 result = asus_hotk_get_info();
1227         } else {
1228                 printk(KERN_ERR "  Hotkey device not present, aborting\n");
1229                 return -EINVAL;
1230         }
1231
1232         return result;
1233 }
1234
1235 static int asus_hotk_found;
1236
1237 static int asus_hotk_add(struct acpi_device *device)
1238 {
1239         acpi_status status = AE_OK;
1240         int result;
1241
1242         if (!device)
1243                 return -EINVAL;
1244
1245         printk(KERN_NOTICE "Asus Laptop ACPI Extras version %s\n",
1246                ASUS_ACPI_VERSION);
1247
1248         hotk =
1249             (struct asus_hotk *)kmalloc(sizeof(struct asus_hotk), GFP_KERNEL);
1250         if (!hotk)
1251                 return -ENOMEM;
1252         memset(hotk, 0, sizeof(struct asus_hotk));
1253
1254         hotk->handle = device->handle;
1255         strcpy(acpi_device_name(device), ACPI_HOTK_DEVICE_NAME);
1256         strcpy(acpi_device_class(device), ACPI_HOTK_CLASS);
1257         acpi_driver_data(device) = hotk;
1258         hotk->device = device;
1259
1260         result = asus_hotk_check();
1261         if (result)
1262                 goto end;
1263
1264         result = asus_hotk_add_fs(device);
1265         if (result)
1266                 goto end;
1267
1268         /*
1269          * We install the handler, it will receive the hotk in parameter, so, we
1270          * could add other data to the hotk struct
1271          */
1272         status = acpi_install_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1273                                              asus_hotk_notify, hotk);
1274         if (ACPI_FAILURE(status))
1275                 printk(KERN_ERR "  Error installing notify handler\n");
1276
1277         /* For laptops without GPLV: init the hotk->brightness value */
1278         if ((!hotk->methods->brightness_get)
1279             && (!hotk->methods->brightness_status)
1280             && (hotk->methods->brightness_up && hotk->methods->brightness_down)) {
1281                 status =
1282                     acpi_evaluate_object(NULL, hotk->methods->brightness_down,
1283                                          NULL, NULL);
1284                 if (ACPI_FAILURE(status))
1285                         printk(KERN_WARNING "  Error changing brightness\n");
1286                 else {
1287                         status =
1288                             acpi_evaluate_object(NULL,
1289                                                  hotk->methods->brightness_up,
1290                                                  NULL, NULL);
1291                         if (ACPI_FAILURE(status))
1292                                 printk(KERN_WARNING "  Strange, error changing"
1293                                        " brightness\n");
1294                 }
1295         }
1296
1297         asus_hotk_found = 1;
1298
1299         /* LED display is off by default */
1300         hotk->ledd_status = 0xFFF;
1301
1302       end:
1303         if (result) {
1304                 kfree(hotk);
1305         }
1306
1307         return result;
1308 }
1309
1310 static int asus_hotk_remove(struct acpi_device *device, int type)
1311 {
1312         acpi_status status = 0;
1313
1314         if (!device || !acpi_driver_data(device))
1315                 return -EINVAL;
1316
1317         status = acpi_remove_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1318                                             asus_hotk_notify);
1319         if (ACPI_FAILURE(status))
1320                 printk(KERN_ERR "Asus ACPI: Error removing notify handler\n");
1321
1322         asus_hotk_remove_fs(device);
1323
1324         kfree(hotk);
1325
1326         return 0;
1327 }
1328
1329 static int __init asus_acpi_init(void)
1330 {
1331         int result;
1332
1333         if (acpi_disabled)
1334                 return -ENODEV;
1335
1336         if (!acpi_specific_hotkey_enabled) {
1337                 printk(KERN_ERR "Using generic hotkey driver\n");
1338                 return -ENODEV;
1339         }
1340         asus_proc_dir = proc_mkdir(PROC_ASUS, acpi_root_dir);
1341         if (!asus_proc_dir) {
1342                 printk(KERN_ERR "Asus ACPI: Unable to create /proc entry\n");
1343                 return -ENODEV;
1344         }
1345         asus_proc_dir->owner = THIS_MODULE;
1346
1347         result = acpi_bus_register_driver(&asus_hotk_driver);
1348         if (result < 0) {
1349                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1350                 return result;
1351         }
1352
1353         /*
1354          * This is a bit of a kludge.  We only want this module loaded
1355          * for ASUS systems, but there's currently no way to probe the
1356          * ACPI namespace for ASUS HIDs.  So we just return failure if
1357          * we didn't find one, which will cause the module to be
1358          * unloaded.
1359          */
1360         if (!asus_hotk_found) {
1361                 acpi_bus_unregister_driver(&asus_hotk_driver);
1362                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1363                 return result;
1364         }
1365
1366         return 0;
1367 }
1368
1369 static void __exit asus_acpi_exit(void)
1370 {
1371         acpi_bus_unregister_driver(&asus_hotk_driver);
1372         remove_proc_entry(PROC_ASUS, acpi_root_dir);
1373
1374         kfree(asus_info);
1375
1376         return;
1377 }
1378
1379 module_init(asus_acpi_init);
1380 module_exit(asus_acpi_exit);