git.oblomov.eu Git - linux-2.6/blob - drivers/platform/x86/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  *  �ic 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 <linux/backlight.h>
  39 #include <acpi/acpi_drivers.h>
  40 #include <acpi/acpi_bus.h>
  41 #include <asm/uaccess.h>
  42
  43 #define ASUS_ACPI_VERSION "0.30"
  44
  45 #define PROC_ASUS       "asus"  /* The directory */
  46 #define PROC_MLED       "mled"
  47 #define PROC_WLED       "wled"
  48 #define PROC_TLED       "tled"
  49 #define PROC_BT         "bluetooth"
  50 #define PROC_LEDD       "ledd"
  51 #define PROC_INFO       "info"
  52 #define PROC_LCD        "lcd"
  53 #define PROC_BRN        "brn"
  54 #define PROC_DISP       "disp"
  55
  56 #define ACPI_HOTK_NAME          "Asus Laptop ACPI Extras Driver"
  57 #define ACPI_HOTK_CLASS         "hotkey"
  58 #define ACPI_HOTK_DEVICE_NAME   "Hotkey"
  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");
  82 module_param(asus_gid, uint, 0);
  83 MODULE_PARM_DESC(asus_gid, "GID for entries in /proc/acpi/asus");
  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;  /* method to set brightness down ____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                 W3V,            /* W3030V */
 142                 xxN,            /* M2400N, M3700N, M5200N, M6800N,
 143                                                          S1300N, S5200N*/
 144                 A4S,            /* Z81sp */
 145                 F3Sa,           /* (Centrino) */
 146                 END_MODEL
 147         } model;                /* Models currently supported */
 148         u16 event_count[128];   /* Count for each event TODO make this better */
 149 };
 150
 151 /* Here we go */
 152 #define A1x_PREFIX "\\_SB.PCI0.ISA.EC0."
 153 #define L3C_PREFIX "\\_SB.PCI0.PX40.ECD0."
 154 #define M1A_PREFIX "\\_SB.PCI0.PX40.EC0."
 155 #define P30_PREFIX "\\_SB.PCI0.LPCB.EC0."
 156 #define S1x_PREFIX "\\_SB.PCI0.PX40."
 157 #define S2x_PREFIX A1x_PREFIX
 158 #define xxN_PREFIX "\\_SB.PCI0.SBRG.EC0."
 159
 160 static struct model_data model_conf[END_MODEL] = {
 161         /*
 162          * TODO I have seen a SWBX and AIBX method on some models, like L1400B,
 163          * it seems to be a kind of switch, but what for ?
 164          */
 165
 166         {
 167          .name = "A1x",
 168          .mt_mled = "MLED",
 169          .mled_status = "\\MAIL",
 170          .mt_lcd_switch = A1x_PREFIX "_Q10",
 171          .lcd_status = "\\BKLI",
 172          .brightness_up = A1x_PREFIX "_Q0E",
 173          .brightness_down = A1x_PREFIX "_Q0F"},
 174
 175         {
 176          .name = "A2x",
 177          .mt_mled = "MLED",
 178          .mt_wled = "WLED",
 179          .wled_status = "\\SG66",
 180          .mt_lcd_switch = "\\Q10",
 181          .lcd_status = "\\BAOF",
 182          .brightness_set = "SPLV",
 183          .brightness_get = "GPLV",
 184          .display_set = "SDSP",
 185          .display_get = "\\INFB"},
 186
 187         {
 188          .name = "A4G",
 189          .mt_mled = "MLED",
 190 /* WLED present, but not controlled by ACPI */
 191          .mt_lcd_switch = xxN_PREFIX "_Q10",
 192          .brightness_set = "SPLV",
 193          .brightness_get = "GPLV",
 194          .display_set = "SDSP",
 195          .display_get = "\\ADVG"},
 196
 197         {
 198          .name = "D1x",
 199          .mt_mled = "MLED",
 200          .mt_lcd_switch = "\\Q0D",
 201          .lcd_status = "\\GP11",
 202          .brightness_up = "\\Q0C",
 203          .brightness_down = "\\Q0B",
 204          .brightness_status = "\\BLVL",
 205          .display_set = "SDSP",
 206          .display_get = "\\INFB"},
 207
 208         {
 209          .name = "L2D",
 210          .mt_mled = "MLED",
 211          .mled_status = "\\SGP6",
 212          .mt_wled = "WLED",
 213          .wled_status = "\\RCP3",
 214          .mt_lcd_switch = "\\Q10",
 215          .lcd_status = "\\SGP0",
 216          .brightness_up = "\\Q0E",
 217          .brightness_down = "\\Q0F",
 218          .display_set = "SDSP",
 219          .display_get = "\\INFB"},
 220
 221         {
 222          .name = "L3C",
 223          .mt_mled = "MLED",
 224          .mt_wled = "WLED",
 225          .mt_lcd_switch = L3C_PREFIX "_Q10",
 226          .lcd_status = "\\GL32",
 227          .brightness_set = "SPLV",
 228          .brightness_get = "GPLV",
 229          .display_set = "SDSP",
 230          .display_get = "\\_SB.PCI0.PCI1.VGAC.NMAP"},
 231
 232         {
 233          .name = "L3D",
 234          .mt_mled = "MLED",
 235          .mled_status = "\\MALD",
 236          .mt_wled = "WLED",
 237          .mt_lcd_switch = "\\Q10",
 238          .lcd_status = "\\BKLG",
 239          .brightness_set = "SPLV",
 240          .brightness_get = "GPLV",
 241          .display_set = "SDSP",
 242          .display_get = "\\INFB"},
 243
 244         {
 245          .name = "L3H",
 246          .mt_mled = "MLED",
 247          .mt_wled = "WLED",
 248          .mt_lcd_switch = "EHK",
 249          .lcd_status = "\\_SB.PCI0.PM.PBC",
 250          .brightness_set = "SPLV",
 251          .brightness_get = "GPLV",
 252          .display_set = "SDSP",
 253          .display_get = "\\INFB"},
 254
 255         {
 256          .name = "L4R",
 257          .mt_mled = "MLED",
 258          .mt_wled = "WLED",
 259          .wled_status = "\\_SB.PCI0.SBRG.SG13",
 260          .mt_lcd_switch = xxN_PREFIX "_Q10",
 261          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
 262          .brightness_set = "SPLV",
 263          .brightness_get = "GPLV",
 264          .display_set = "SDSP",
 265          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
 266
 267         {
 268          .name = "L5x",
 269          .mt_mled = "MLED",
 270 /* WLED present, but not controlled by ACPI */
 271          .mt_tled = "TLED",
 272          .mt_lcd_switch = "\\Q0D",
 273          .lcd_status = "\\BAOF",
 274          .brightness_set = "SPLV",
 275          .brightness_get = "GPLV",
 276          .display_set = "SDSP",
 277          .display_get = "\\INFB"},
 278
 279         {
 280          .name = "L8L"
 281 /* No features, but at least support the hotkeys */
 282          },
 283
 284         {
 285          .name = "M1A",
 286          .mt_mled = "MLED",
 287          .mt_lcd_switch = M1A_PREFIX "Q10",
 288          .lcd_status = "\\PNOF",
 289          .brightness_up = M1A_PREFIX "Q0E",
 290          .brightness_down = M1A_PREFIX "Q0F",
 291          .brightness_status = "\\BRIT",
 292          .display_set = "SDSP",
 293          .display_get = "\\INFB"},
 294
 295         {
 296          .name = "M2E",
 297          .mt_mled = "MLED",
 298          .mt_wled = "WLED",
 299          .mt_lcd_switch = "\\Q10",
 300          .lcd_status = "\\GP06",
 301          .brightness_set = "SPLV",
 302          .brightness_get = "GPLV",
 303          .display_set = "SDSP",
 304          .display_get = "\\INFB"},
 305
 306         {
 307          .name = "M6N",
 308          .mt_mled = "MLED",
 309          .mt_wled = "WLED",
 310          .wled_status = "\\_SB.PCI0.SBRG.SG13",
 311          .mt_lcd_switch = xxN_PREFIX "_Q10",
 312          .lcd_status = "\\_SB.BKLT",
 313          .brightness_set = "SPLV",
 314          .brightness_get = "GPLV",
 315          .display_set = "SDSP",
 316          .display_get = "\\SSTE"},
 317
 318         {
 319          .name = "M6R",
 320          .mt_mled = "MLED",
 321          .mt_wled = "WLED",
 322          .mt_lcd_switch = xxN_PREFIX "_Q10",
 323          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
 324          .brightness_set = "SPLV",
 325          .brightness_get = "GPLV",
 326          .display_set = "SDSP",
 327          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
 328
 329         {
 330          .name = "P30",
 331          .mt_wled = "WLED",
 332          .mt_lcd_switch = P30_PREFIX "_Q0E",
 333          .lcd_status = "\\BKLT",
 334          .brightness_up = P30_PREFIX "_Q68",
 335          .brightness_down = P30_PREFIX "_Q69",
 336          .brightness_get = "GPLV",
 337          .display_set = "SDSP",
 338          .display_get = "\\DNXT"},
 339
 340         {
 341          .name = "S1x",
 342          .mt_mled = "MLED",
 343          .mled_status = "\\EMLE",
 344          .mt_wled = "WLED",
 345          .mt_lcd_switch = S1x_PREFIX "Q10",
 346          .lcd_status = "\\PNOF",
 347          .brightness_set = "SPLV",
 348          .brightness_get = "GPLV"},
 349
 350         {
 351          .name = "S2x",
 352          .mt_mled = "MLED",
 353          .mled_status = "\\MAIL",
 354          .mt_lcd_switch = S2x_PREFIX "_Q10",
 355          .lcd_status = "\\BKLI",
 356          .brightness_up = S2x_PREFIX "_Q0B",
 357          .brightness_down = S2x_PREFIX "_Q0A"},
 358
 359         {
 360          .name = "W1N",
 361          .mt_mled = "MLED",
 362          .mt_wled = "WLED",
 363          .mt_ledd = "SLCM",
 364          .mt_lcd_switch = xxN_PREFIX "_Q10",
 365          .lcd_status = "\\BKLT",
 366          .brightness_set = "SPLV",
 367          .brightness_get = "GPLV",
 368          .display_set = "SDSP",
 369          .display_get = "\\ADVG"},
 370
 371         {
 372          .name = "W5A",
 373          .mt_bt_switch = "BLED",
 374          .mt_wled = "WLED",
 375          .mt_lcd_switch = xxN_PREFIX "_Q10",
 376          .brightness_set = "SPLV",
 377          .brightness_get = "GPLV",
 378          .display_set = "SDSP",
 379          .display_get = "\\ADVG"},
 380
 381         {
 382          .name = "W3V",
 383          .mt_mled = "MLED",
 384          .mt_wled = "WLED",
 385          .mt_lcd_switch = xxN_PREFIX "_Q10",
 386          .lcd_status = "\\BKLT",
 387          .brightness_set = "SPLV",
 388          .brightness_get = "GPLV",
 389          .display_set = "SDSP",
 390          .display_get = "\\INFB"},
 391
 392        {
 393          .name = "xxN",
 394          .mt_mled = "MLED",
 395 /* WLED present, but not controlled by ACPI */
 396          .mt_lcd_switch = xxN_PREFIX "_Q10",
 397          .lcd_status = "\\BKLT",
 398          .brightness_set = "SPLV",
 399          .brightness_get = "GPLV",
 400          .display_set = "SDSP",
 401         .display_get = "\\ADVG"},
 402
 403         {
 404                 .name              = "A4S",
 405                 .brightness_set    = "SPLV",
 406                 .brightness_get    = "GPLV",
 407                 .mt_bt_switch      = "BLED",
 408                 .mt_wled           = "WLED"
 409         },
 410
 411         {
 412                 .name           = "F3Sa",
 413                 .mt_bt_switch   = "BLED",
 414                 .mt_wled        = "WLED",
 415                 .mt_mled        = "MLED",
 416                 .brightness_get = "GPLV",
 417                 .brightness_set = "SPLV",
 418                 .mt_lcd_switch  = "\\_SB.PCI0.SBRG.EC0._Q10",
 419                 .lcd_status     = "\\_SB.PCI0.SBRG.EC0.RPIN",
 420                 .display_get    = "\\ADVG",
 421                 .display_set    = "SDSP",
 422         },
 423
 424 };
 425
 426 /* procdir we use */
 427 static struct proc_dir_entry *asus_proc_dir;
 428
 429 static struct backlight_device *asus_backlight_device;
 430
 431 /*
 432  * This header is made available to allow proper configuration given model,
 433  * revision number , ... this info cannot go in struct asus_hotk because it is
 434  * available before the hotk
 435  */
 436 static struct acpi_table_header *asus_info;
 437
 438 /* The actual device the driver binds to */
 439 static struct asus_hotk *hotk;
 440
 441 /*
 442  * The hotkey driver and autoloading declaration
 443  */
 444 static int asus_hotk_add(struct acpi_device *device);
 445 static int asus_hotk_remove(struct acpi_device *device, int type);
 446 static const struct acpi_device_id asus_device_ids[] = {
 447         {"ATK0100", 0},
 448         {"", 0},
 449 };
 450 MODULE_DEVICE_TABLE(acpi, asus_device_ids);
 451
 452 static struct acpi_driver asus_hotk_driver = {
 453         .name = "asus_acpi",
 454         .class = ACPI_HOTK_CLASS,
 455         .ids = asus_device_ids,
 456         .ops = {
 457                 .add = asus_hotk_add,
 458                 .remove = asus_hotk_remove,
 459                 },
 460 };
 461
 462 /*
 463  * This function evaluates an ACPI method, given an int as parameter, the
 464  * method is searched within the scope of the handle, can be NULL. The output
 465  * of the method is written is output, which can also be NULL
 466  *
 467  * returns 1 if write is successful, 0 else.
 468  */
 469 static int write_acpi_int(acpi_handle handle, const char *method, int val,
 470                           struct acpi_buffer *output)
 471 {
 472         struct acpi_object_list params; /* list of input parameters (int) */
 473         union acpi_object in_obj;       /* the only param we use */
 474         acpi_status status;
 475
 476         params.count = 1;
 477         params.pointer = &in_obj;
 478         in_obj.type = ACPI_TYPE_INTEGER;
 479         in_obj.integer.value = val;
 480
 481         status = acpi_evaluate_object(handle, (char *)method, &params, output);
 482         return (status == AE_OK);
 483 }
 484
 485 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
 486 {
 487         struct acpi_buffer output;
 488         union acpi_object out_obj;
 489         acpi_status status;
 490
 491         output.length = sizeof(out_obj);
 492         output.pointer = &out_obj;
 493
 494         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
 495         *val = out_obj.integer.value;
 496         return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
 497 }
 498
 499 /*
 500  * We write our info in page, we begin at offset off and cannot write more
 501  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 502  * number of bytes written in page
 503  */
 504 static int
 505 proc_read_info(char *page, char **start, off_t off, int count, int *eof,
 506                void *data)
 507 {
 508         int len = 0;
 509         int temp;
 510         char buf[16];           /* enough for all info */
 511         /*
 512          * We use the easy way, we don't care of off and count,
 513          * so we don't set eof to 1
 514          */
 515
 516         len += sprintf(page, ACPI_HOTK_NAME " " ASUS_ACPI_VERSION "\n");
 517         len += sprintf(page + len, "Model reference    : %s\n",
 518                        hotk->methods->name);
 519         /*
 520          * The SFUN method probably allows the original driver to get the list
 521          * of features supported by a given model. For now, 0x0100 or 0x0800
 522          * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
 523          * The significance of others is yet to be found.
 524          */
 525         if (read_acpi_int(hotk->handle, "SFUN", &temp))
 526                 len +=
 527                     sprintf(page + len, "SFUN value         : 0x%04x\n", temp);
 528         /*
 529          * Another value for userspace: the ASYM method returns 0x02 for
 530          * battery low and 0x04 for battery critical, its readings tend to be
 531          * more accurate than those provided by _BST.
 532          * Note: since not all the laptops provide this method, errors are
 533          * silently ignored.
 534          */
 535         if (read_acpi_int(hotk->handle, "ASYM", &temp))
 536                 len +=
 537                     sprintf(page + len, "ASYM value         : 0x%04x\n", temp);
 538         if (asus_info) {
 539                 snprintf(buf, 16, "%d", asus_info->length);
 540                 len += sprintf(page + len, "DSDT length        : %s\n", buf);
 541                 snprintf(buf, 16, "%d", asus_info->checksum);
 542                 len += sprintf(page + len, "DSDT checksum      : %s\n", buf);
 543                 snprintf(buf, 16, "%d", asus_info->revision);
 544                 len += sprintf(page + len, "DSDT revision      : %s\n", buf);
 545                 snprintf(buf, 7, "%s", asus_info->oem_id);
 546                 len += sprintf(page + len, "OEM id             : %s\n", buf);
 547                 snprintf(buf, 9, "%s", asus_info->oem_table_id);
 548                 len += sprintf(page + len, "OEM table id       : %s\n", buf);
 549                 snprintf(buf, 16, "%x", asus_info->oem_revision);
 550                 len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);
 551                 snprintf(buf, 5, "%s", asus_info->asl_compiler_id);
 552                 len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
 553                 snprintf(buf, 16, "%x", asus_info->asl_compiler_revision);
 554                 len += sprintf(page + len, "ASL comp revision  : 0x%s\n", buf);
 555         }
 556
 557         return len;
 558 }
 559
 560 /*
 561  * /proc handlers
 562  * We write our info in page, we begin at offset off and cannot write more
 563  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 564  * number of bytes written in page
 565  */
 566
 567 /* Generic LED functions */
 568 static int read_led(const char *ledname, int ledmask)
 569 {
 570         if (ledname) {
 571                 int led_status;
 572
 573                 if (read_acpi_int(NULL, ledname, &led_status))
 574                         return led_status;
 575                 else
 576                         printk(KERN_WARNING "Asus ACPI: Error reading LED "
 577                                "status\n");
 578         }
 579         return (hotk->status & ledmask) ? 1 : 0;
 580 }
 581
 582 static int parse_arg(const char __user *buf, unsigned long count, int *val)
 583 {
 584         char s[32];
 585         if (!count)
 586                 return 0;
 587         if (count > 31)
 588                 return -EINVAL;
 589         if (copy_from_user(s, buf, count))
 590                 return -EFAULT;
 591         s[count] = 0;
 592         if (sscanf(s, "%i", val) != 1)
 593                 return -EINVAL;
 594         return count;
 595 }
 596
 597 /* FIXME: kill extraneous args so it can be called independently */
 598 static int
 599 write_led(const char __user *buffer, unsigned long count,
 600           char *ledname, int ledmask, int invert)
 601 {
 602         int rv, value;
 603         int led_out = 0;
 604
 605         rv = parse_arg(buffer, count, &value);
 606         if (rv > 0)
 607                 led_out = value ? 1 : 0;
 608
 609         hotk->status =
 610             (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);
 611
 612         if (invert)             /* invert target value */
 613                 led_out = !led_out;
 614
 615         if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
 616                 printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",
 617                        ledname);
 618
 619         return rv;
 620 }
 621
 622 /*
 623  * Proc handlers for MLED
 624  */
 625 static int
 626 proc_read_mled(char *page, char **start, off_t off, int count, int *eof,
 627                void *data)
 628 {
 629         return sprintf(page, "%d\n",
 630                        read_led(hotk->methods->mled_status, MLED_ON));
 631 }
 632
 633 static int
 634 proc_write_mled(struct file *file, const char __user *buffer,
 635                 unsigned long count, void *data)
 636 {
 637         return write_led(buffer, count, hotk->methods->mt_mled, MLED_ON, 1);
 638 }
 639
 640 /*
 641  * Proc handlers for LED display
 642  */
 643 static int
 644 proc_read_ledd(char *page, char **start, off_t off, int count, int *eof,
 645                void *data)
 646 {
 647         return sprintf(page, "0x%08x\n", hotk->ledd_status);
 648 }
 649
 650 static int
 651 proc_write_ledd(struct file *file, const char __user *buffer,
 652                 unsigned long count, void *data)
 653 {
 654         int rv, value;
 655
 656         rv = parse_arg(buffer, count, &value);
 657         if (rv > 0) {
 658                 if (!write_acpi_int
 659                     (hotk->handle, hotk->methods->mt_ledd, value, NULL))
 660                         printk(KERN_WARNING
 661                                "Asus ACPI: LED display write failed\n");
 662                 else
 663                         hotk->ledd_status = (u32) value;
 664         }
 665         return rv;
 666 }
 667
 668 /*
 669  * Proc handlers for WLED
 670  */
 671 static int
 672 proc_read_wled(char *page, char **start, off_t off, int count, int *eof,
 673                void *data)
 674 {
 675         return sprintf(page, "%d\n",
 676                        read_led(hotk->methods->wled_status, WLED_ON));
 677 }
 678
 679 static int
 680 proc_write_wled(struct file *file, const char __user *buffer,
 681                 unsigned long count, void *data)
 682 {
 683         return write_led(buffer, count, hotk->methods->mt_wled, WLED_ON, 0);
 684 }
 685
 686 /*
 687  * Proc handlers for Bluetooth
 688  */
 689 static int
 690 proc_read_bluetooth(char *page, char **start, off_t off, int count, int *eof,
 691                     void *data)
 692 {
 693         return sprintf(page, "%d\n", read_led(hotk->methods->bt_status, BT_ON));
 694 }
 695
 696 static int
 697 proc_write_bluetooth(struct file *file, const char __user *buffer,
 698                      unsigned long count, void *data)
 699 {
 700         /* Note: mt_bt_switch controls both internal Bluetooth adapter's
 701            presence and its LED */
 702         return write_led(buffer, count, hotk->methods->mt_bt_switch, BT_ON, 0);
 703 }
 704
 705 /*
 706  * Proc handlers for TLED
 707  */
 708 static int
 709 proc_read_tled(char *page, char **start, off_t off, int count, int *eof,
 710                void *data)
 711 {
 712         return sprintf(page, "%d\n",
 713                        read_led(hotk->methods->tled_status, TLED_ON));
 714 }
 715
 716 static int
 717 proc_write_tled(struct file *file, const char __user *buffer,
 718                 unsigned long count, void *data)
 719 {
 720         return write_led(buffer, count, hotk->methods->mt_tled, TLED_ON, 0);
 721 }
 722
 723 static int get_lcd_state(void)
 724 {
 725         int lcd = 0;
 726
 727         if (hotk->model == L3H) {
 728                 /* L3H and the like have to be handled differently */
 729                 acpi_status status = 0;
 730                 struct acpi_object_list input;
 731                 union acpi_object mt_params[2];
 732                 struct acpi_buffer output;
 733                 union acpi_object out_obj;
 734
 735                 input.count = 2;
 736                 input.pointer = mt_params;
 737                 /* Note: the following values are partly guessed up, but
 738                    otherwise they seem to work */
 739                 mt_params[0].type = ACPI_TYPE_INTEGER;
 740                 mt_params[0].integer.value = 0x02;
 741                 mt_params[1].type = ACPI_TYPE_INTEGER;
 742                 mt_params[1].integer.value = 0x02;
 743
 744                 output.length = sizeof(out_obj);
 745                 output.pointer = &out_obj;
 746
 747                 status =
 748                     acpi_evaluate_object(NULL, hotk->methods->lcd_status,
 749                                          &input, &output);
 750                 if (status != AE_OK)
 751                         return -1;
 752                 if (out_obj.type == ACPI_TYPE_INTEGER)
 753                         /* That's what the AML code does */
 754                         lcd = out_obj.integer.value >> 8;
 755         } else if (hotk->model == F3Sa) {
 756                 unsigned long long tmp;
 757                 union acpi_object param;
 758                 struct acpi_object_list input;
 759                 acpi_status status;
 760
 761                 /* Read pin 11 */
 762                 param.type = ACPI_TYPE_INTEGER;
 763                 param.integer.value = 0x11;
 764                 input.count = 1;
 765                 input.pointer = &param;
 766
 767                 status = acpi_evaluate_integer(NULL, hotk->methods->lcd_status,
 768                                                 &input, &tmp);
 769                 if (status != AE_OK)
 770                         return -1;
 771
 772                 lcd = tmp;
 773         } else {
 774                 /* We don't have to check anything if we are here */
 775                 if (!read_acpi_int(NULL, hotk->methods->lcd_status, &lcd))
 776                         printk(KERN_WARNING
 777                                "Asus ACPI: Error reading LCD status\n");
 778
 779                 if (hotk->model == L2D)
 780                         lcd = ~lcd;
 781         }
 782
 783         return (lcd & 1);
 784 }
 785
 786 static int set_lcd_state(int value)
 787 {
 788         int lcd = 0;
 789         acpi_status status = 0;
 790
 791         lcd = value ? 1 : 0;
 792         if (lcd != get_lcd_state()) {
 793                 /* switch */
 794                 if (hotk->model != L3H) {
 795                         status =
 796                             acpi_evaluate_object(NULL,
 797                                                  hotk->methods->mt_lcd_switch,
 798                                                  NULL, NULL);
 799                 } else {
 800                         /* L3H and the like must be handled differently */
 801                         if (!write_acpi_int
 802                             (hotk->handle, hotk->methods->mt_lcd_switch, 0x07,
 803                              NULL))
 804                                 status = AE_ERROR;
 805                         /* L3H's AML executes EHK (0x07) upon Fn+F7 keypress,
 806                            the exact behaviour is simulated here */
 807                 }
 808                 if (ACPI_FAILURE(status))
 809                         printk(KERN_WARNING "Asus ACPI: Error switching LCD\n");
 810         }
 811         return 0;
 812
 813 }
 814
 815 static int
 816 proc_read_lcd(char *page, char **start, off_t off, int count, int *eof,
 817               void *data)
 818 {
 819         return sprintf(page, "%d\n", get_lcd_state());
 820 }
 821
 822 static int
 823 proc_write_lcd(struct file *file, const char __user *buffer,
 824                unsigned long count, void *data)
 825 {
 826         int rv, value;
 827
 828         rv = parse_arg(buffer, count, &value);
 829         if (rv > 0)
 830                 set_lcd_state(value);
 831         return rv;
 832 }
 833
 834 static int read_brightness(struct backlight_device *bd)
 835 {
 836         int value;
 837
 838         if (hotk->methods->brightness_get) {    /* SPLV/GPLV laptop */
 839                 if (!read_acpi_int(hotk->handle, hotk->methods->brightness_get,
 840                                    &value))
 841                         printk(KERN_WARNING
 842                                "Asus ACPI: Error reading brightness\n");
 843         } else if (hotk->methods->brightness_status) {  /* For D1 for example */
 844                 if (!read_acpi_int(NULL, hotk->methods->brightness_status,
 845                                    &value))
 846                         printk(KERN_WARNING
 847                                "Asus ACPI: Error reading brightness\n");
 848         } else                  /* No GPLV method */
 849                 value = hotk->brightness;
 850         return value;
 851 }
 852
 853 /*
 854  * Change the brightness level
 855  */
 856 static int set_brightness(int value)
 857 {
 858         acpi_status status = 0;
 859         int ret = 0;
 860
 861         /* SPLV laptop */
 862         if (hotk->methods->brightness_set) {
 863                 if (!write_acpi_int(hotk->handle, hotk->methods->brightness_set,
 864                                     value, NULL))
 865                         printk(KERN_WARNING
 866                                "Asus ACPI: Error changing brightness\n");
 867                         ret = -EIO;
 868                 goto out;
 869         }
 870
 871         /* No SPLV method if we are here, act as appropriate */
 872         value -= read_brightness(NULL);
 873         while (value != 0) {
 874                 status = acpi_evaluate_object(NULL, (value > 0) ?
 875                                               hotk->methods->brightness_up :
 876                                               hotk->methods->brightness_down,
 877                                               NULL, NULL);
 878                 (value > 0) ? value-- : value++;
 879                 if (ACPI_FAILURE(status))
 880                         printk(KERN_WARNING
 881                                "Asus ACPI: Error changing brightness\n");
 882                         ret = -EIO;
 883         }
 884 out:
 885         return ret;
 886 }
 887
 888 static int set_brightness_status(struct backlight_device *bd)
 889 {
 890         return set_brightness(bd->props.brightness);
 891 }
 892
 893 static int
 894 proc_read_brn(char *page, char **start, off_t off, int count, int *eof,
 895               void *data)
 896 {
 897         return sprintf(page, "%d\n", read_brightness(NULL));
 898 }
 899
 900 static int
 901 proc_write_brn(struct file *file, const char __user *buffer,
 902                unsigned long count, void *data)
 903 {
 904         int rv, value;
 905
 906         rv = parse_arg(buffer, count, &value);
 907         if (rv > 0) {
 908                 value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
 909                 /* 0 <= value <= 15 */
 910                 set_brightness(value);
 911         }
 912         return rv;
 913 }
 914
 915 static void set_display(int value)
 916 {
 917         /* no sanity check needed for now */
 918         if (!write_acpi_int(hotk->handle, hotk->methods->display_set,
 919                             value, NULL))
 920                 printk(KERN_WARNING "Asus ACPI: Error setting display\n");
 921         return;
 922 }
 923
 924 /*
 925  * Now, *this* one could be more user-friendly, but so far, no-one has
 926  * complained. The significance of bits is the same as in proc_write_disp()
 927  */
 928 static int
 929 proc_read_disp(char *page, char **start, off_t off, int count, int *eof,
 930                void *data)
 931 {
 932         int value = 0;
 933
 934         if (!read_acpi_int(hotk->handle, hotk->methods->display_get, &value))
 935                 printk(KERN_WARNING
 936                        "Asus ACPI: Error reading display status\n");
 937         value &= 0x07;  /* needed for some models, shouldn't hurt others */
 938         return sprintf(page, "%d\n", value);
 939 }
 940
 941 /*
 942  * Experimental support for display switching. As of now: 1 should activate
 943  * the LCD output, 2 should do for CRT, and 4 for TV-Out. Any combination
 944  * (bitwise) of these will suffice. I never actually tested 3 displays hooked
 945  * up simultaneously, so be warned. See the acpi4asus README for more info.
 946  */
 947 static int
 948 proc_write_disp(struct file *file, const char __user *buffer,
 949                 unsigned long count, void *data)
 950 {
 951         int rv, value;
 952
 953         rv = parse_arg(buffer, count, &value);
 954         if (rv > 0)
 955                 set_display(value);
 956         return rv;
 957 }
 958
 959 typedef int (proc_readfunc) (char *page, char **start, off_t off, int count,
 960                              int *eof, void *data);
 961 typedef int (proc_writefunc) (struct file *file, const char __user *buffer,
 962                               unsigned long count, void *data);
 963
 964 static int
 965 asus_proc_add(char *name, proc_writefunc *writefunc,
 966                      proc_readfunc *readfunc, mode_t mode,
 967                      struct acpi_device *device)
 968 {
 969         struct proc_dir_entry *proc =
 970             create_proc_entry(name, mode, acpi_device_dir(device));
 971         if (!proc) {
 972                 printk(KERN_WARNING "  Unable to create %s fs entry\n", name);
 973                 return -1;
 974         }
 975         proc->write_proc = writefunc;
 976         proc->read_proc = readfunc;
 977         proc->data = acpi_driver_data(device);
 978         proc->owner = THIS_MODULE;
 979         proc->uid = asus_uid;
 980         proc->gid = asus_gid;
 981         return 0;
 982 }
 983
 984 static int asus_hotk_add_fs(struct acpi_device *device)
 985 {
 986         struct proc_dir_entry *proc;
 987         mode_t mode;
 988
 989         /*
 990          * If parameter uid or gid is not changed, keep the default setting for
 991          * our proc entries (-rw-rw-rw-) else, it means we care about security,
 992          * and then set to -rw-rw----
 993          */
 994
 995         if ((asus_uid == 0) && (asus_gid == 0)) {
 996                 mode = S_IFREG | S_IRUGO | S_IWUGO;
 997         } else {
 998                 mode = S_IFREG | S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
 999                 printk(KERN_WARNING "  asus_uid and asus_gid parameters are "
1000                        "deprecated, use chown and chmod instead!\n");
1001         }
1002
1003         acpi_device_dir(device) = asus_proc_dir;
1004         if (!acpi_device_dir(device))
1005                 return -ENODEV;
1006
1007         proc = create_proc_entry(PROC_INFO, mode, acpi_device_dir(device));
1008         if (proc) {
1009                 proc->read_proc = proc_read_info;
1010                 proc->data = acpi_driver_data(device);
1011                 proc->owner = THIS_MODULE;
1012                 proc->uid = asus_uid;
1013                 proc->gid = asus_gid;
1014         } else {
1015                 printk(KERN_WARNING "  Unable to create " PROC_INFO
1016                        " fs entry\n");
1017         }
1018
1019         if (hotk->methods->mt_wled) {
1020                 asus_proc_add(PROC_WLED, &proc_write_wled, &proc_read_wled,
1021                               mode, device);
1022         }
1023
1024         if (hotk->methods->mt_ledd) {
1025                 asus_proc_add(PROC_LEDD, &proc_write_ledd, &proc_read_ledd,
1026                               mode, device);
1027         }
1028
1029         if (hotk->methods->mt_mled) {
1030                 asus_proc_add(PROC_MLED, &proc_write_mled, &proc_read_mled,
1031                               mode, device);
1032         }
1033
1034         if (hotk->methods->mt_tled) {
1035                 asus_proc_add(PROC_TLED, &proc_write_tled, &proc_read_tled,
1036                               mode, device);
1037         }
1038
1039         if (hotk->methods->mt_bt_switch) {
1040                 asus_proc_add(PROC_BT, &proc_write_bluetooth,
1041                               &proc_read_bluetooth, mode, device);
1042         }
1043
1044         /*
1045          * We need both read node and write method as LCD switch is also
1046          * accessible from the keyboard
1047          */
1048         if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status) {
1049                 asus_proc_add(PROC_LCD, &proc_write_lcd, &proc_read_lcd, mode,
1050                               device);
1051         }
1052
1053         if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
1054             (hotk->methods->brightness_get && hotk->methods->brightness_set)) {
1055                 asus_proc_add(PROC_BRN, &proc_write_brn, &proc_read_brn, mode,
1056                               device);
1057         }
1058
1059         if (hotk->methods->display_set) {
1060                 asus_proc_add(PROC_DISP, &proc_write_disp, &proc_read_disp,
1061                               mode, device);
1062         }
1063
1064         return 0;
1065 }
1066
1067 static int asus_hotk_remove_fs(struct acpi_device *device)
1068 {
1069         if (acpi_device_dir(device)) {
1070                 remove_proc_entry(PROC_INFO, acpi_device_dir(device));
1071                 if (hotk->methods->mt_wled)
1072                         remove_proc_entry(PROC_WLED, acpi_device_dir(device));
1073                 if (hotk->methods->mt_mled)
1074                         remove_proc_entry(PROC_MLED, acpi_device_dir(device));
1075                 if (hotk->methods->mt_tled)
1076                         remove_proc_entry(PROC_TLED, acpi_device_dir(device));
1077                 if (hotk->methods->mt_ledd)
1078                         remove_proc_entry(PROC_LEDD, acpi_device_dir(device));
1079                 if (hotk->methods->mt_bt_switch)
1080                         remove_proc_entry(PROC_BT, acpi_device_dir(device));
1081                 if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status)
1082                         remove_proc_entry(PROC_LCD, acpi_device_dir(device));
1083                 if ((hotk->methods->brightness_up
1084                      && hotk->methods->brightness_down)
1085                     || (hotk->methods->brightness_get
1086                         && hotk->methods->brightness_set))
1087                         remove_proc_entry(PROC_BRN, acpi_device_dir(device));
1088                 if (hotk->methods->display_set)
1089                         remove_proc_entry(PROC_DISP, acpi_device_dir(device));
1090         }
1091         return 0;
1092 }
1093
1094 static void asus_hotk_notify(acpi_handle handle, u32 event, void *data)
1095 {
1096         /* TODO Find a better way to handle events count. */
1097         if (!hotk)
1098                 return;
1099
1100         if ((event & ~((u32) BR_UP)) < 16)
1101                 hotk->brightness = (event & ~((u32) BR_UP));
1102         else if ((event & ~((u32) BR_DOWN)) < 16)
1103                 hotk->brightness = (event & ~((u32) BR_DOWN));
1104
1105         acpi_bus_generate_proc_event(hotk->device, event,
1106                                 hotk->event_count[event % 128]++);
1107
1108         return;
1109 }
1110
1111 /*
1112  * Match the model string to the list of supported models. Return END_MODEL if
1113  * no match or model is NULL.
1114  */
1115 static int asus_model_match(char *model)
1116 {
1117         if (model == NULL)
1118                 return END_MODEL;
1119
1120         if (strncmp(model, "L3D", 3) == 0)
1121                 return L3D;
1122         else if (strncmp(model, "L2E", 3) == 0 ||
1123                  strncmp(model, "L3H", 3) == 0 || strncmp(model, "L5D", 3) == 0)
1124                 return L3H;
1125         else if (strncmp(model, "L3", 2) == 0 || strncmp(model, "L2B", 3) == 0)
1126                 return L3C;
1127         else if (strncmp(model, "L8L", 3) == 0)
1128                 return L8L;
1129         else if (strncmp(model, "L4R", 3) == 0)
1130                 return L4R;
1131         else if (strncmp(model, "M6N", 3) == 0 || strncmp(model, "W3N", 3) == 0)
1132                 return M6N;
1133         else if (strncmp(model, "M6R", 3) == 0 || strncmp(model, "A3G", 3) == 0)
1134                 return M6R;
1135         else if (strncmp(model, "M2N", 3) == 0 ||
1136                  strncmp(model, "M3N", 3) == 0 ||
1137                  strncmp(model, "M5N", 3) == 0 ||
1138                  strncmp(model, "M6N", 3) == 0 ||
1139                  strncmp(model, "S1N", 3) == 0 ||
1140                  strncmp(model, "S5N", 3) == 0 || strncmp(model, "W1N", 3) == 0)
1141                 return xxN;
1142         else if (strncmp(model, "M1", 2) == 0)
1143                 return M1A;
1144         else if (strncmp(model, "M2", 2) == 0 || strncmp(model, "L4E", 3) == 0)
1145                 return M2E;
1146         else if (strncmp(model, "L2", 2) == 0)
1147                 return L2D;
1148         else if (strncmp(model, "L8", 2) == 0)
1149                 return S1x;
1150         else if (strncmp(model, "D1", 2) == 0)
1151                 return D1x;
1152         else if (strncmp(model, "A1", 2) == 0)
1153                 return A1x;
1154         else if (strncmp(model, "A2", 2) == 0)
1155                 return A2x;
1156         else if (strncmp(model, "J1", 2) == 0)
1157                 return S2x;
1158         else if (strncmp(model, "L5", 2) == 0)
1159                 return L5x;
1160         else if (strncmp(model, "A4G", 3) == 0)
1161                 return A4G;
1162         else if (strncmp(model, "W1N", 3) == 0)
1163                 return W1N;
1164         else if (strncmp(model, "W3V", 3) == 0)
1165                 return W3V;
1166         else if (strncmp(model, "W5A", 3) == 0)
1167                 return W5A;
1168         else if (strncmp(model, "A4S", 3) == 0)
1169                 return A4S;
1170         else if (strncmp(model, "F3Sa", 4) == 0)
1171                 return F3Sa;
1172         else
1173                 return END_MODEL;
1174 }
1175
1176 /*
1177  * This function is used to initialize the hotk with right values. In this
1178  * method, we can make all the detection we want, and modify the hotk struct
1179  */
1180 static int asus_hotk_get_info(void)
1181 {
1182         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1183         union acpi_object *model = NULL;
1184         int bsts_result;
1185         char *string = NULL;
1186         acpi_status status;
1187
1188         /*
1189          * Get DSDT headers early enough to allow for differentiating between
1190          * models, but late enough to allow acpi_bus_register_driver() to fail
1191          * before doing anything ACPI-specific. Should we encounter a machine,
1192          * which needs special handling (i.e. its hotkey device has a different
1193          * HID), this bit will be moved. A global variable asus_info contains
1194          * the DSDT header.
1195          */
1196         status = acpi_get_table(ACPI_SIG_DSDT, 1, &asus_info);
1197         if (ACPI_FAILURE(status))
1198                 printk(KERN_WARNING "  Couldn't get the DSDT table header\n");
1199
1200         /* We have to write 0 on init this far for all ASUS models */
1201         if (!write_acpi_int(hotk->handle, "INIT", 0, &buffer)) {
1202                 printk(KERN_ERR "  Hotkey initialization failed\n");
1203                 return -ENODEV;
1204         }
1205
1206         /* This needs to be called for some laptops to init properly */
1207         if (!read_acpi_int(hotk->handle, "BSTS", &bsts_result))
1208                 printk(KERN_WARNING "  Error calling BSTS\n");
1209         else if (bsts_result)
1210                 printk(KERN_NOTICE "  BSTS called, 0x%02x returned\n",
1211                        bsts_result);
1212
1213         /*
1214          * Try to match the object returned by INIT to the specific model.
1215          * Handle every possible object (or the lack of thereof) the DSDT
1216          * writers might throw at us. When in trouble, we pass NULL to
1217          * asus_model_match() and try something completely different.
1218          */
1219         if (buffer.pointer) {
1220                 model = buffer.pointer;
1221                 switch (model->type) {
1222                 case ACPI_TYPE_STRING:
1223                         string = model->string.pointer;
1224                         break;
1225                 case ACPI_TYPE_BUFFER:
1226                         string = model->buffer.pointer;
1227                         break;
1228                 default:
1229                         kfree(model);
1230                         model = NULL;
1231                         break;
1232                 }
1233         }
1234         hotk->model = asus_model_match(string);
1235         if (hotk->model == END_MODEL) { /* match failed */
1236                 if (asus_info &&
1237                     strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) {
1238                         hotk->model = P30;
1239                         printk(KERN_NOTICE
1240                                "  Samsung P30 detected, supported\n");
1241                 } else {
1242                         hotk->model = M2E;
1243                         printk(KERN_NOTICE "  unsupported model %s, trying "
1244                                "default values\n", string);
1245                         printk(KERN_NOTICE
1246                                "  send /proc/acpi/dsdt to the developers\n");
1247                         kfree(model);
1248                         return -ENODEV;
1249                 }
1250                 hotk->methods = &model_conf[hotk->model];
1251                 return AE_OK;
1252         }
1253         hotk->methods = &model_conf[hotk->model];
1254         printk(KERN_NOTICE "  %s model detected, supported\n", string);
1255
1256         /* Sort of per-model blacklist */
1257         if (strncmp(string, "L2B", 3) == 0)
1258                 hotk->methods->lcd_status = NULL;
1259         /* L2B is similar enough to L3C to use its settings, with this only
1260            exception */
1261         else if (strncmp(string, "A3G", 3) == 0)
1262                 hotk->methods->lcd_status = "\\BLFG";
1263         /* A3G is like M6R */
1264         else if (strncmp(string, "S5N", 3) == 0 ||
1265                  strncmp(string, "M5N", 3) == 0 ||
1266                  strncmp(string, "W3N", 3) == 0)
1267                 hotk->methods->mt_mled = NULL;
1268         /* S5N, M5N and W3N have no MLED */
1269         else if (strncmp(string, "L5D", 3) == 0)
1270                 hotk->methods->mt_wled = NULL;
1271         /* L5D's WLED is not controlled by ACPI */
1272         else if (strncmp(string, "M2N", 3) == 0 ||
1273                  strncmp(string, "W3V", 3) == 0 ||
1274                  strncmp(string, "S1N", 3) == 0)
1275                 hotk->methods->mt_wled = "WLED";
1276         /* M2N, S1N and W3V have a usable WLED */
1277         else if (asus_info) {
1278                 if (strncmp(asus_info->oem_table_id, "L1", 2) == 0)
1279                         hotk->methods->mled_status = NULL;
1280                 /* S1300A reports L84F, but L1400B too, account for that */
1281         }
1282
1283         kfree(model);
1284
1285         return AE_OK;
1286 }
1287
1288 static int asus_hotk_check(void)
1289 {
1290         int result = 0;
1291
1292         result = acpi_bus_get_status(hotk->device);
1293         if (result)
1294                 return result;
1295
1296         if (hotk->device->status.present) {
1297                 result = asus_hotk_get_info();
1298         } else {
1299                 printk(KERN_ERR "  Hotkey device not present, aborting\n");
1300                 return -EINVAL;
1301         }
1302
1303         return result;
1304 }
1305
1306 static int asus_hotk_found;
1307
1308 static int asus_hotk_add(struct acpi_device *device)
1309 {
1310         acpi_status status = AE_OK;
1311         int result;
1312
1313         if (!device)
1314                 return -EINVAL;
1315
1316         printk(KERN_NOTICE "Asus Laptop ACPI Extras version %s\n",
1317                ASUS_ACPI_VERSION);
1318
1319         hotk = kzalloc(sizeof(struct asus_hotk), GFP_KERNEL);
1320         if (!hotk)
1321                 return -ENOMEM;
1322
1323         hotk->handle = device->handle;
1324         strcpy(acpi_device_name(device), ACPI_HOTK_DEVICE_NAME);
1325         strcpy(acpi_device_class(device), ACPI_HOTK_CLASS);
1326         device->driver_data = hotk;
1327         hotk->device = device;
1328
1329         result = asus_hotk_check();
1330         if (result)
1331                 goto end;
1332
1333         result = asus_hotk_add_fs(device);
1334         if (result)
1335                 goto end;
1336
1337         /*
1338          * We install the handler, it will receive the hotk in parameter, so, we
1339          * could add other data to the hotk struct
1340          */
1341         status = acpi_install_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1342                                              asus_hotk_notify, hotk);
1343         if (ACPI_FAILURE(status))
1344                 printk(KERN_ERR "  Error installing notify handler\n");
1345
1346         /* For laptops without GPLV: init the hotk->brightness value */
1347         if ((!hotk->methods->brightness_get)
1348             && (!hotk->methods->brightness_status)
1349             && (hotk->methods->brightness_up && hotk->methods->brightness_down)) {
1350                 status =
1351                     acpi_evaluate_object(NULL, hotk->methods->brightness_down,
1352                                          NULL, NULL);
1353                 if (ACPI_FAILURE(status))
1354                         printk(KERN_WARNING "  Error changing brightness\n");
1355                 else {
1356                         status =
1357                             acpi_evaluate_object(NULL,
1358                                                  hotk->methods->brightness_up,
1359                                                  NULL, NULL);
1360                         if (ACPI_FAILURE(status))
1361                                 printk(KERN_WARNING "  Strange, error changing"
1362                                        " brightness\n");
1363                 }
1364         }
1365
1366         asus_hotk_found = 1;
1367
1368         /* LED display is off by default */
1369         hotk->ledd_status = 0xFFF;
1370
1371 end:
1372         if (result)
1373                 kfree(hotk);
1374
1375         return result;
1376 }
1377
1378 static int asus_hotk_remove(struct acpi_device *device, int type)
1379 {
1380         acpi_status status = 0;
1381
1382         if (!device || !acpi_driver_data(device))
1383                 return -EINVAL;
1384
1385         status = acpi_remove_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1386                                             asus_hotk_notify);
1387         if (ACPI_FAILURE(status))
1388                 printk(KERN_ERR "Asus ACPI: Error removing notify handler\n");
1389
1390         asus_hotk_remove_fs(device);
1391
1392         kfree(hotk);
1393
1394         return 0;
1395 }
1396
1397 static struct backlight_ops asus_backlight_data = {
1398         .get_brightness = read_brightness,
1399         .update_status  = set_brightness_status,
1400 };
1401
1402 static void asus_acpi_exit(void)
1403 {
1404         if (asus_backlight_device)
1405                 backlight_device_unregister(asus_backlight_device);
1406
1407         acpi_bus_unregister_driver(&asus_hotk_driver);
1408         remove_proc_entry(PROC_ASUS, acpi_root_dir);
1409
1410         return;
1411 }
1412
1413 static int __init asus_acpi_init(void)
1414 {
1415         int result;
1416
1417         if (acpi_disabled)
1418                 return -ENODEV;
1419
1420         asus_proc_dir = proc_mkdir(PROC_ASUS, acpi_root_dir);
1421         if (!asus_proc_dir) {
1422                 printk(KERN_ERR "Asus ACPI: Unable to create /proc entry\n");
1423                 return -ENODEV;
1424         }
1425         asus_proc_dir->owner = THIS_MODULE;
1426
1427         result = acpi_bus_register_driver(&asus_hotk_driver);
1428         if (result < 0) {
1429                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1430                 return result;
1431         }
1432
1433         /*
1434          * This is a bit of a kludge.  We only want this module loaded
1435          * for ASUS systems, but there's currently no way to probe the
1436          * ACPI namespace for ASUS HIDs.  So we just return failure if
1437          * we didn't find one, which will cause the module to be
1438          * unloaded.
1439          */
1440         if (!asus_hotk_found) {
1441                 acpi_bus_unregister_driver(&asus_hotk_driver);
1442                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1443                 return -ENODEV;
1444         }
1445
1446         asus_backlight_device = backlight_device_register("asus", NULL, NULL,
1447                                                           &asus_backlight_data);
1448         if (IS_ERR(asus_backlight_device)) {
1449                 printk(KERN_ERR "Could not register asus backlight device\n");
1450                 asus_backlight_device = NULL;
1451                 asus_acpi_exit();
1452                 return -ENODEV;
1453         }
1454         asus_backlight_device->props.max_brightness = 15;
1455
1456         return 0;
1457 }
1458
1459 module_init(asus_acpi_init);
1460 module_exit(asus_acpi_exit);