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                 R1F,
 147                 END_MODEL
 148         } model;                /* Models currently supported */
 149         u16 event_count[128];   /* Count for each event TODO make this better */
 150 };
 151
 152 /* Here we go */
 153 #define A1x_PREFIX "\\_SB.PCI0.ISA.EC0."
 154 #define L3C_PREFIX "\\_SB.PCI0.PX40.ECD0."
 155 #define M1A_PREFIX "\\_SB.PCI0.PX40.EC0."
 156 #define P30_PREFIX "\\_SB.PCI0.LPCB.EC0."
 157 #define S1x_PREFIX "\\_SB.PCI0.PX40."
 158 #define S2x_PREFIX A1x_PREFIX
 159 #define xxN_PREFIX "\\_SB.PCI0.SBRG.EC0."
 160
 161 static struct model_data model_conf[END_MODEL] = {
 162         /*
 163          * TODO I have seen a SWBX and AIBX method on some models, like L1400B,
 164          * it seems to be a kind of switch, but what for ?
 165          */
 166
 167         {
 168          .name = "A1x",
 169          .mt_mled = "MLED",
 170          .mled_status = "\\MAIL",
 171          .mt_lcd_switch = A1x_PREFIX "_Q10",
 172          .lcd_status = "\\BKLI",
 173          .brightness_up = A1x_PREFIX "_Q0E",
 174          .brightness_down = A1x_PREFIX "_Q0F"},
 175
 176         {
 177          .name = "A2x",
 178          .mt_mled = "MLED",
 179          .mt_wled = "WLED",
 180          .wled_status = "\\SG66",
 181          .mt_lcd_switch = "\\Q10",
 182          .lcd_status = "\\BAOF",
 183          .brightness_set = "SPLV",
 184          .brightness_get = "GPLV",
 185          .display_set = "SDSP",
 186          .display_get = "\\INFB"},
 187
 188         {
 189          .name = "A4G",
 190          .mt_mled = "MLED",
 191 /* WLED present, but not controlled by ACPI */
 192          .mt_lcd_switch = xxN_PREFIX "_Q10",
 193          .brightness_set = "SPLV",
 194          .brightness_get = "GPLV",
 195          .display_set = "SDSP",
 196          .display_get = "\\ADVG"},
 197
 198         {
 199          .name = "D1x",
 200          .mt_mled = "MLED",
 201          .mt_lcd_switch = "\\Q0D",
 202          .lcd_status = "\\GP11",
 203          .brightness_up = "\\Q0C",
 204          .brightness_down = "\\Q0B",
 205          .brightness_status = "\\BLVL",
 206          .display_set = "SDSP",
 207          .display_get = "\\INFB"},
 208
 209         {
 210          .name = "L2D",
 211          .mt_mled = "MLED",
 212          .mled_status = "\\SGP6",
 213          .mt_wled = "WLED",
 214          .wled_status = "\\RCP3",
 215          .mt_lcd_switch = "\\Q10",
 216          .lcd_status = "\\SGP0",
 217          .brightness_up = "\\Q0E",
 218          .brightness_down = "\\Q0F",
 219          .display_set = "SDSP",
 220          .display_get = "\\INFB"},
 221
 222         {
 223          .name = "L3C",
 224          .mt_mled = "MLED",
 225          .mt_wled = "WLED",
 226          .mt_lcd_switch = L3C_PREFIX "_Q10",
 227          .lcd_status = "\\GL32",
 228          .brightness_set = "SPLV",
 229          .brightness_get = "GPLV",
 230          .display_set = "SDSP",
 231          .display_get = "\\_SB.PCI0.PCI1.VGAC.NMAP"},
 232
 233         {
 234          .name = "L3D",
 235          .mt_mled = "MLED",
 236          .mled_status = "\\MALD",
 237          .mt_wled = "WLED",
 238          .mt_lcd_switch = "\\Q10",
 239          .lcd_status = "\\BKLG",
 240          .brightness_set = "SPLV",
 241          .brightness_get = "GPLV",
 242          .display_set = "SDSP",
 243          .display_get = "\\INFB"},
 244
 245         {
 246          .name = "L3H",
 247          .mt_mled = "MLED",
 248          .mt_wled = "WLED",
 249          .mt_lcd_switch = "EHK",
 250          .lcd_status = "\\_SB.PCI0.PM.PBC",
 251          .brightness_set = "SPLV",
 252          .brightness_get = "GPLV",
 253          .display_set = "SDSP",
 254          .display_get = "\\INFB"},
 255
 256         {
 257          .name = "L4R",
 258          .mt_mled = "MLED",
 259          .mt_wled = "WLED",
 260          .wled_status = "\\_SB.PCI0.SBRG.SG13",
 261          .mt_lcd_switch = xxN_PREFIX "_Q10",
 262          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
 263          .brightness_set = "SPLV",
 264          .brightness_get = "GPLV",
 265          .display_set = "SDSP",
 266          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
 267
 268         {
 269          .name = "L5x",
 270          .mt_mled = "MLED",
 271 /* WLED present, but not controlled by ACPI */
 272          .mt_tled = "TLED",
 273          .mt_lcd_switch = "\\Q0D",
 274          .lcd_status = "\\BAOF",
 275          .brightness_set = "SPLV",
 276          .brightness_get = "GPLV",
 277          .display_set = "SDSP",
 278          .display_get = "\\INFB"},
 279
 280         {
 281          .name = "L8L"
 282 /* No features, but at least support the hotkeys */
 283          },
 284
 285         {
 286          .name = "M1A",
 287          .mt_mled = "MLED",
 288          .mt_lcd_switch = M1A_PREFIX "Q10",
 289          .lcd_status = "\\PNOF",
 290          .brightness_up = M1A_PREFIX "Q0E",
 291          .brightness_down = M1A_PREFIX "Q0F",
 292          .brightness_status = "\\BRIT",
 293          .display_set = "SDSP",
 294          .display_get = "\\INFB"},
 295
 296         {
 297          .name = "M2E",
 298          .mt_mled = "MLED",
 299          .mt_wled = "WLED",
 300          .mt_lcd_switch = "\\Q10",
 301          .lcd_status = "\\GP06",
 302          .brightness_set = "SPLV",
 303          .brightness_get = "GPLV",
 304          .display_set = "SDSP",
 305          .display_get = "\\INFB"},
 306
 307         {
 308          .name = "M6N",
 309          .mt_mled = "MLED",
 310          .mt_wled = "WLED",
 311          .wled_status = "\\_SB.PCI0.SBRG.SG13",
 312          .mt_lcd_switch = xxN_PREFIX "_Q10",
 313          .lcd_status = "\\_SB.BKLT",
 314          .brightness_set = "SPLV",
 315          .brightness_get = "GPLV",
 316          .display_set = "SDSP",
 317          .display_get = "\\SSTE"},
 318
 319         {
 320          .name = "M6R",
 321          .mt_mled = "MLED",
 322          .mt_wled = "WLED",
 323          .mt_lcd_switch = xxN_PREFIX "_Q10",
 324          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
 325          .brightness_set = "SPLV",
 326          .brightness_get = "GPLV",
 327          .display_set = "SDSP",
 328          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
 329
 330         {
 331          .name = "P30",
 332          .mt_wled = "WLED",
 333          .mt_lcd_switch = P30_PREFIX "_Q0E",
 334          .lcd_status = "\\BKLT",
 335          .brightness_up = P30_PREFIX "_Q68",
 336          .brightness_down = P30_PREFIX "_Q69",
 337          .brightness_get = "GPLV",
 338          .display_set = "SDSP",
 339          .display_get = "\\DNXT"},
 340
 341         {
 342          .name = "S1x",
 343          .mt_mled = "MLED",
 344          .mled_status = "\\EMLE",
 345          .mt_wled = "WLED",
 346          .mt_lcd_switch = S1x_PREFIX "Q10",
 347          .lcd_status = "\\PNOF",
 348          .brightness_set = "SPLV",
 349          .brightness_get = "GPLV"},
 350
 351         {
 352          .name = "S2x",
 353          .mt_mled = "MLED",
 354          .mled_status = "\\MAIL",
 355          .mt_lcd_switch = S2x_PREFIX "_Q10",
 356          .lcd_status = "\\BKLI",
 357          .brightness_up = S2x_PREFIX "_Q0B",
 358          .brightness_down = S2x_PREFIX "_Q0A"},
 359
 360         {
 361          .name = "W1N",
 362          .mt_mled = "MLED",
 363          .mt_wled = "WLED",
 364          .mt_ledd = "SLCM",
 365          .mt_lcd_switch = xxN_PREFIX "_Q10",
 366          .lcd_status = "\\BKLT",
 367          .brightness_set = "SPLV",
 368          .brightness_get = "GPLV",
 369          .display_set = "SDSP",
 370          .display_get = "\\ADVG"},
 371
 372         {
 373          .name = "W5A",
 374          .mt_bt_switch = "BLED",
 375          .mt_wled = "WLED",
 376          .mt_lcd_switch = xxN_PREFIX "_Q10",
 377          .brightness_set = "SPLV",
 378          .brightness_get = "GPLV",
 379          .display_set = "SDSP",
 380          .display_get = "\\ADVG"},
 381
 382         {
 383          .name = "W3V",
 384          .mt_mled = "MLED",
 385          .mt_wled = "WLED",
 386          .mt_lcd_switch = xxN_PREFIX "_Q10",
 387          .lcd_status = "\\BKLT",
 388          .brightness_set = "SPLV",
 389          .brightness_get = "GPLV",
 390          .display_set = "SDSP",
 391          .display_get = "\\INFB"},
 392
 393        {
 394          .name = "xxN",
 395          .mt_mled = "MLED",
 396 /* WLED present, but not controlled by ACPI */
 397          .mt_lcd_switch = xxN_PREFIX "_Q10",
 398          .lcd_status = "\\BKLT",
 399          .brightness_set = "SPLV",
 400          .brightness_get = "GPLV",
 401          .display_set = "SDSP",
 402         .display_get = "\\ADVG"},
 403
 404         {
 405                 .name              = "A4S",
 406                 .brightness_set    = "SPLV",
 407                 .brightness_get    = "GPLV",
 408                 .mt_bt_switch      = "BLED",
 409                 .mt_wled           = "WLED"
 410         },
 411
 412         {
 413                 .name           = "F3Sa",
 414                 .mt_bt_switch   = "BLED",
 415                 .mt_wled        = "WLED",
 416                 .mt_mled        = "MLED",
 417                 .brightness_get = "GPLV",
 418                 .brightness_set = "SPLV",
 419                 .mt_lcd_switch  = "\\_SB.PCI0.SBRG.EC0._Q10",
 420                 .lcd_status     = "\\_SB.PCI0.SBRG.EC0.RPIN",
 421                 .display_get    = "\\ADVG",
 422                 .display_set    = "SDSP",
 423         },
 424         {
 425                 .name = "R1F",
 426                 .mt_bt_switch = "BLED",
 427                 .mt_mled = "MLED",
 428                 .mt_wled = "WLED",
 429                 .mt_lcd_switch = "\\Q10",
 430                 .lcd_status = "\\GP06",
 431                 .brightness_set = "SPLV",
 432                 .brightness_get = "GPLV",
 433                 .display_set = "SDSP",
 434                 .display_get = "\\INFB"
 435         }
 436 };
 437
 438 /* procdir we use */
 439 static struct proc_dir_entry *asus_proc_dir;
 440
 441 static struct backlight_device *asus_backlight_device;
 442
 443 /*
 444  * This header is made available to allow proper configuration given model,
 445  * revision number , ... this info cannot go in struct asus_hotk because it is
 446  * available before the hotk
 447  */
 448 static struct acpi_table_header *asus_info;
 449
 450 /* The actual device the driver binds to */
 451 static struct asus_hotk *hotk;
 452
 453 /*
 454  * The hotkey driver and autoloading declaration
 455  */
 456 static int asus_hotk_add(struct acpi_device *device);
 457 static int asus_hotk_remove(struct acpi_device *device, int type);
 458 static const struct acpi_device_id asus_device_ids[] = {
 459         {"ATK0100", 0},
 460         {"", 0},
 461 };
 462 MODULE_DEVICE_TABLE(acpi, asus_device_ids);
 463
 464 static struct acpi_driver asus_hotk_driver = {
 465         .name = "asus_acpi",
 466         .class = ACPI_HOTK_CLASS,
 467         .ids = asus_device_ids,
 468         .ops = {
 469                 .add = asus_hotk_add,
 470                 .remove = asus_hotk_remove,
 471                 },
 472 };
 473
 474 /*
 475  * This function evaluates an ACPI method, given an int as parameter, the
 476  * method is searched within the scope of the handle, can be NULL. The output
 477  * of the method is written is output, which can also be NULL
 478  *
 479  * returns 1 if write is successful, 0 else.
 480  */
 481 static int write_acpi_int(acpi_handle handle, const char *method, int val,
 482                           struct acpi_buffer *output)
 483 {
 484         struct acpi_object_list params; /* list of input parameters (int) */
 485         union acpi_object in_obj;       /* the only param we use */
 486         acpi_status status;
 487
 488         params.count = 1;
 489         params.pointer = &in_obj;
 490         in_obj.type = ACPI_TYPE_INTEGER;
 491         in_obj.integer.value = val;
 492
 493         status = acpi_evaluate_object(handle, (char *)method, &params, output);
 494         return (status == AE_OK);
 495 }
 496
 497 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
 498 {
 499         struct acpi_buffer output;
 500         union acpi_object out_obj;
 501         acpi_status status;
 502
 503         output.length = sizeof(out_obj);
 504         output.pointer = &out_obj;
 505
 506         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
 507         *val = out_obj.integer.value;
 508         return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
 509 }
 510
 511 /*
 512  * We write our info in page, we begin at offset off and cannot write more
 513  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 514  * number of bytes written in page
 515  */
 516 static int
 517 proc_read_info(char *page, char **start, off_t off, int count, int *eof,
 518                void *data)
 519 {
 520         int len = 0;
 521         int temp;
 522         char buf[16];           /* enough for all info */
 523         /*
 524          * We use the easy way, we don't care of off and count,
 525          * so we don't set eof to 1
 526          */
 527
 528         len += sprintf(page, ACPI_HOTK_NAME " " ASUS_ACPI_VERSION "\n");
 529         len += sprintf(page + len, "Model reference    : %s\n",
 530                        hotk->methods->name);
 531         /*
 532          * The SFUN method probably allows the original driver to get the list
 533          * of features supported by a given model. For now, 0x0100 or 0x0800
 534          * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
 535          * The significance of others is yet to be found.
 536          */
 537         if (read_acpi_int(hotk->handle, "SFUN", &temp))
 538                 len +=
 539                     sprintf(page + len, "SFUN value         : 0x%04x\n", temp);
 540         /*
 541          * Another value for userspace: the ASYM method returns 0x02 for
 542          * battery low and 0x04 for battery critical, its readings tend to be
 543          * more accurate than those provided by _BST.
 544          * Note: since not all the laptops provide this method, errors are
 545          * silently ignored.
 546          */
 547         if (read_acpi_int(hotk->handle, "ASYM", &temp))
 548                 len +=
 549                     sprintf(page + len, "ASYM value         : 0x%04x\n", temp);
 550         if (asus_info) {
 551                 snprintf(buf, 16, "%d", asus_info->length);
 552                 len += sprintf(page + len, "DSDT length        : %s\n", buf);
 553                 snprintf(buf, 16, "%d", asus_info->checksum);
 554                 len += sprintf(page + len, "DSDT checksum      : %s\n", buf);
 555                 snprintf(buf, 16, "%d", asus_info->revision);
 556                 len += sprintf(page + len, "DSDT revision      : %s\n", buf);
 557                 snprintf(buf, 7, "%s", asus_info->oem_id);
 558                 len += sprintf(page + len, "OEM id             : %s\n", buf);
 559                 snprintf(buf, 9, "%s", asus_info->oem_table_id);
 560                 len += sprintf(page + len, "OEM table id       : %s\n", buf);
 561                 snprintf(buf, 16, "%x", asus_info->oem_revision);
 562                 len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);
 563                 snprintf(buf, 5, "%s", asus_info->asl_compiler_id);
 564                 len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
 565                 snprintf(buf, 16, "%x", asus_info->asl_compiler_revision);
 566                 len += sprintf(page + len, "ASL comp revision  : 0x%s\n", buf);
 567         }
 568
 569         return len;
 570 }
 571
 572 /*
 573  * /proc handlers
 574  * We write our info in page, we begin at offset off and cannot write more
 575  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 576  * number of bytes written in page
 577  */
 578
 579 /* Generic LED functions */
 580 static int read_led(const char *ledname, int ledmask)
 581 {
 582         if (ledname) {
 583                 int led_status;
 584
 585                 if (read_acpi_int(NULL, ledname, &led_status))
 586                         return led_status;
 587                 else
 588                         printk(KERN_WARNING "Asus ACPI: Error reading LED "
 589                                "status\n");
 590         }
 591         return (hotk->status & ledmask) ? 1 : 0;
 592 }
 593
 594 static int parse_arg(const char __user *buf, unsigned long count, int *val)
 595 {
 596         char s[32];
 597         if (!count)
 598                 return 0;
 599         if (count > 31)
 600                 return -EINVAL;
 601         if (copy_from_user(s, buf, count))
 602                 return -EFAULT;
 603         s[count] = 0;
 604         if (sscanf(s, "%i", val) != 1)
 605                 return -EINVAL;
 606         return count;
 607 }
 608
 609 /* FIXME: kill extraneous args so it can be called independently */
 610 static int
 611 write_led(const char __user *buffer, unsigned long count,
 612           char *ledname, int ledmask, int invert)
 613 {
 614         int rv, value;
 615         int led_out = 0;
 616
 617         rv = parse_arg(buffer, count, &value);
 618         if (rv > 0)
 619                 led_out = value ? 1 : 0;
 620
 621         hotk->status =
 622             (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);
 623
 624         if (invert)             /* invert target value */
 625                 led_out = !led_out;
 626
 627         if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
 628                 printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",
 629                        ledname);
 630
 631         return rv;
 632 }
 633
 634 /*
 635  * Proc handlers for MLED
 636  */
 637 static int
 638 proc_read_mled(char *page, char **start, off_t off, int count, int *eof,
 639                void *data)
 640 {
 641         return sprintf(page, "%d\n",
 642                        read_led(hotk->methods->mled_status, MLED_ON));
 643 }
 644
 645 static int
 646 proc_write_mled(struct file *file, const char __user *buffer,
 647                 unsigned long count, void *data)
 648 {
 649         return write_led(buffer, count, hotk->methods->mt_mled, MLED_ON, 1);
 650 }
 651
 652 /*
 653  * Proc handlers for LED display
 654  */
 655 static int
 656 proc_read_ledd(char *page, char **start, off_t off, int count, int *eof,
 657                void *data)
 658 {
 659         return sprintf(page, "0x%08x\n", hotk->ledd_status);
 660 }
 661
 662 static int
 663 proc_write_ledd(struct file *file, const char __user *buffer,
 664                 unsigned long count, void *data)
 665 {
 666         int rv, value;
 667
 668         rv = parse_arg(buffer, count, &value);
 669         if (rv > 0) {
 670                 if (!write_acpi_int
 671                     (hotk->handle, hotk->methods->mt_ledd, value, NULL))
 672                         printk(KERN_WARNING
 673                                "Asus ACPI: LED display write failed\n");
 674                 else
 675                         hotk->ledd_status = (u32) value;
 676         }
 677         return rv;
 678 }
 679
 680 /*
 681  * Proc handlers for WLED
 682  */
 683 static int
 684 proc_read_wled(char *page, char **start, off_t off, int count, int *eof,
 685                void *data)
 686 {
 687         return sprintf(page, "%d\n",
 688                        read_led(hotk->methods->wled_status, WLED_ON));
 689 }
 690
 691 static int
 692 proc_write_wled(struct file *file, const char __user *buffer,
 693                 unsigned long count, void *data)
 694 {
 695         return write_led(buffer, count, hotk->methods->mt_wled, WLED_ON, 0);
 696 }
 697
 698 /*
 699  * Proc handlers for Bluetooth
 700  */
 701 static int
 702 proc_read_bluetooth(char *page, char **start, off_t off, int count, int *eof,
 703                     void *data)
 704 {
 705         return sprintf(page, "%d\n", read_led(hotk->methods->bt_status, BT_ON));
 706 }
 707
 708 static int
 709 proc_write_bluetooth(struct file *file, const char __user *buffer,
 710                      unsigned long count, void *data)
 711 {
 712         /* Note: mt_bt_switch controls both internal Bluetooth adapter's
 713            presence and its LED */
 714         return write_led(buffer, count, hotk->methods->mt_bt_switch, BT_ON, 0);
 715 }
 716
 717 /*
 718  * Proc handlers for TLED
 719  */
 720 static int
 721 proc_read_tled(char *page, char **start, off_t off, int count, int *eof,
 722                void *data)
 723 {
 724         return sprintf(page, "%d\n",
 725                        read_led(hotk->methods->tled_status, TLED_ON));
 726 }
 727
 728 static int
 729 proc_write_tled(struct file *file, const char __user *buffer,
 730                 unsigned long count, void *data)
 731 {
 732         return write_led(buffer, count, hotk->methods->mt_tled, TLED_ON, 0);
 733 }
 734
 735 static int get_lcd_state(void)
 736 {
 737         int lcd = 0;
 738
 739         if (hotk->model == L3H) {
 740                 /* L3H and the like have to be handled differently */
 741                 acpi_status status = 0;
 742                 struct acpi_object_list input;
 743                 union acpi_object mt_params[2];
 744                 struct acpi_buffer output;
 745                 union acpi_object out_obj;
 746
 747                 input.count = 2;
 748                 input.pointer = mt_params;
 749                 /* Note: the following values are partly guessed up, but
 750                    otherwise they seem to work */
 751                 mt_params[0].type = ACPI_TYPE_INTEGER;
 752                 mt_params[0].integer.value = 0x02;
 753                 mt_params[1].type = ACPI_TYPE_INTEGER;
 754                 mt_params[1].integer.value = 0x02;
 755
 756                 output.length = sizeof(out_obj);
 757                 output.pointer = &out_obj;
 758
 759                 status =
 760                     acpi_evaluate_object(NULL, hotk->methods->lcd_status,
 761                                          &input, &output);
 762                 if (status != AE_OK)
 763                         return -1;
 764                 if (out_obj.type == ACPI_TYPE_INTEGER)
 765                         /* That's what the AML code does */
 766                         lcd = out_obj.integer.value >> 8;
 767         } else if (hotk->model == F3Sa) {
 768                 unsigned long long tmp;
 769                 union acpi_object param;
 770                 struct acpi_object_list input;
 771                 acpi_status status;
 772
 773                 /* Read pin 11 */
 774                 param.type = ACPI_TYPE_INTEGER;
 775                 param.integer.value = 0x11;
 776                 input.count = 1;
 777                 input.pointer = &param;
 778
 779                 status = acpi_evaluate_integer(NULL, hotk->methods->lcd_status,
 780                                                 &input, &tmp);
 781                 if (status != AE_OK)
 782                         return -1;
 783
 784                 lcd = tmp;
 785         } else {
 786                 /* We don't have to check anything if we are here */
 787                 if (!read_acpi_int(NULL, hotk->methods->lcd_status, &lcd))
 788                         printk(KERN_WARNING
 789                                "Asus ACPI: Error reading LCD status\n");
 790
 791                 if (hotk->model == L2D)
 792                         lcd = ~lcd;
 793         }
 794
 795         return (lcd & 1);
 796 }
 797
 798 static int set_lcd_state(int value)
 799 {
 800         int lcd = 0;
 801         acpi_status status = 0;
 802
 803         lcd = value ? 1 : 0;
 804         if (lcd != get_lcd_state()) {
 805                 /* switch */
 806                 if (hotk->model != L3H) {
 807                         status =
 808                             acpi_evaluate_object(NULL,
 809                                                  hotk->methods->mt_lcd_switch,
 810                                                  NULL, NULL);
 811                 } else {
 812                         /* L3H and the like must be handled differently */
 813                         if (!write_acpi_int
 814                             (hotk->handle, hotk->methods->mt_lcd_switch, 0x07,
 815                              NULL))
 816                                 status = AE_ERROR;
 817                         /* L3H's AML executes EHK (0x07) upon Fn+F7 keypress,
 818                            the exact behaviour is simulated here */
 819                 }
 820                 if (ACPI_FAILURE(status))
 821                         printk(KERN_WARNING "Asus ACPI: Error switching LCD\n");
 822         }
 823         return 0;
 824
 825 }
 826
 827 static int
 828 proc_read_lcd(char *page, char **start, off_t off, int count, int *eof,
 829               void *data)
 830 {
 831         return sprintf(page, "%d\n", get_lcd_state());
 832 }
 833
 834 static int
 835 proc_write_lcd(struct file *file, const char __user *buffer,
 836                unsigned long count, void *data)
 837 {
 838         int rv, value;
 839
 840         rv = parse_arg(buffer, count, &value);
 841         if (rv > 0)
 842                 set_lcd_state(value);
 843         return rv;
 844 }
 845
 846 static int read_brightness(struct backlight_device *bd)
 847 {
 848         int value;
 849
 850         if (hotk->methods->brightness_get) {    /* SPLV/GPLV laptop */
 851                 if (!read_acpi_int(hotk->handle, hotk->methods->brightness_get,
 852                                    &value))
 853                         printk(KERN_WARNING
 854                                "Asus ACPI: Error reading brightness\n");
 855         } else if (hotk->methods->brightness_status) {  /* For D1 for example */
 856                 if (!read_acpi_int(NULL, hotk->methods->brightness_status,
 857                                    &value))
 858                         printk(KERN_WARNING
 859                                "Asus ACPI: Error reading brightness\n");
 860         } else                  /* No GPLV method */
 861                 value = hotk->brightness;
 862         return value;
 863 }
 864
 865 /*
 866  * Change the brightness level
 867  */
 868 static int set_brightness(int value)
 869 {
 870         acpi_status status = 0;
 871         int ret = 0;
 872
 873         /* SPLV laptop */
 874         if (hotk->methods->brightness_set) {
 875                 if (!write_acpi_int(hotk->handle, hotk->methods->brightness_set,
 876                                     value, NULL))
 877                         printk(KERN_WARNING
 878                                "Asus ACPI: Error changing brightness\n");
 879                         ret = -EIO;
 880                 goto out;
 881         }
 882
 883         /* No SPLV method if we are here, act as appropriate */
 884         value -= read_brightness(NULL);
 885         while (value != 0) {
 886                 status = acpi_evaluate_object(NULL, (value > 0) ?
 887                                               hotk->methods->brightness_up :
 888                                               hotk->methods->brightness_down,
 889                                               NULL, NULL);
 890                 (value > 0) ? value-- : value++;
 891                 if (ACPI_FAILURE(status))
 892                         printk(KERN_WARNING
 893                                "Asus ACPI: Error changing brightness\n");
 894                         ret = -EIO;
 895         }
 896 out:
 897         return ret;
 898 }
 899
 900 static int set_brightness_status(struct backlight_device *bd)
 901 {
 902         return set_brightness(bd->props.brightness);
 903 }
 904
 905 static int
 906 proc_read_brn(char *page, char **start, off_t off, int count, int *eof,
 907               void *data)
 908 {
 909         return sprintf(page, "%d\n", read_brightness(NULL));
 910 }
 911
 912 static int
 913 proc_write_brn(struct file *file, const char __user *buffer,
 914                unsigned long count, void *data)
 915 {
 916         int rv, value;
 917
 918         rv = parse_arg(buffer, count, &value);
 919         if (rv > 0) {
 920                 value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
 921                 /* 0 <= value <= 15 */
 922                 set_brightness(value);
 923         }
 924         return rv;
 925 }
 926
 927 static void set_display(int value)
 928 {
 929         /* no sanity check needed for now */
 930         if (!write_acpi_int(hotk->handle, hotk->methods->display_set,
 931                             value, NULL))
 932                 printk(KERN_WARNING "Asus ACPI: Error setting display\n");
 933         return;
 934 }
 935
 936 /*
 937  * Now, *this* one could be more user-friendly, but so far, no-one has
 938  * complained. The significance of bits is the same as in proc_write_disp()
 939  */
 940 static int
 941 proc_read_disp(char *page, char **start, off_t off, int count, int *eof,
 942                void *data)
 943 {
 944         int value = 0;
 945
 946         if (!read_acpi_int(hotk->handle, hotk->methods->display_get, &value))
 947                 printk(KERN_WARNING
 948                        "Asus ACPI: Error reading display status\n");
 949         value &= 0x07;  /* needed for some models, shouldn't hurt others */
 950         return sprintf(page, "%d\n", value);
 951 }
 952
 953 /*
 954  * Experimental support for display switching. As of now: 1 should activate
 955  * the LCD output, 2 should do for CRT, and 4 for TV-Out. Any combination
 956  * (bitwise) of these will suffice. I never actually tested 3 displays hooked
 957  * up simultaneously, so be warned. See the acpi4asus README for more info.
 958  */
 959 static int
 960 proc_write_disp(struct file *file, const char __user *buffer,
 961                 unsigned long count, void *data)
 962 {
 963         int rv, value;
 964
 965         rv = parse_arg(buffer, count, &value);
 966         if (rv > 0)
 967                 set_display(value);
 968         return rv;
 969 }
 970
 971 typedef int (proc_readfunc) (char *page, char **start, off_t off, int count,
 972                              int *eof, void *data);
 973 typedef int (proc_writefunc) (struct file *file, const char __user *buffer,
 974                               unsigned long count, void *data);
 975
 976 static int
 977 asus_proc_add(char *name, proc_writefunc *writefunc,
 978                      proc_readfunc *readfunc, mode_t mode,
 979                      struct acpi_device *device)
 980 {
 981         struct proc_dir_entry *proc =
 982             create_proc_entry(name, mode, acpi_device_dir(device));
 983         if (!proc) {
 984                 printk(KERN_WARNING "  Unable to create %s fs entry\n", name);
 985                 return -1;
 986         }
 987         proc->write_proc = writefunc;
 988         proc->read_proc = readfunc;
 989         proc->data = acpi_driver_data(device);
 990         proc->owner = THIS_MODULE;
 991         proc->uid = asus_uid;
 992         proc->gid = asus_gid;
 993         return 0;
 994 }
 995
 996 static int asus_hotk_add_fs(struct acpi_device *device)
 997 {
 998         struct proc_dir_entry *proc;
 999         mode_t mode;
1000
1001         /*
1002          * If parameter uid or gid is not changed, keep the default setting for
1003          * our proc entries (-rw-rw-rw-) else, it means we care about security,
1004          * and then set to -rw-rw----
1005          */
1006
1007         if ((asus_uid == 0) && (asus_gid == 0)) {
1008                 mode = S_IFREG | S_IRUGO | S_IWUGO;
1009         } else {
1010                 mode = S_IFREG | S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
1011                 printk(KERN_WARNING "  asus_uid and asus_gid parameters are "
1012                        "deprecated, use chown and chmod instead!\n");
1013         }
1014
1015         acpi_device_dir(device) = asus_proc_dir;
1016         if (!acpi_device_dir(device))
1017                 return -ENODEV;
1018
1019         proc = create_proc_entry(PROC_INFO, mode, acpi_device_dir(device));
1020         if (proc) {
1021                 proc->read_proc = proc_read_info;
1022                 proc->data = acpi_driver_data(device);
1023                 proc->owner = THIS_MODULE;
1024                 proc->uid = asus_uid;
1025                 proc->gid = asus_gid;
1026         } else {
1027                 printk(KERN_WARNING "  Unable to create " PROC_INFO
1028                        " fs entry\n");
1029         }
1030
1031         if (hotk->methods->mt_wled) {
1032                 asus_proc_add(PROC_WLED, &proc_write_wled, &proc_read_wled,
1033                               mode, device);
1034         }
1035
1036         if (hotk->methods->mt_ledd) {
1037                 asus_proc_add(PROC_LEDD, &proc_write_ledd, &proc_read_ledd,
1038                               mode, device);
1039         }
1040
1041         if (hotk->methods->mt_mled) {
1042                 asus_proc_add(PROC_MLED, &proc_write_mled, &proc_read_mled,
1043                               mode, device);
1044         }
1045
1046         if (hotk->methods->mt_tled) {
1047                 asus_proc_add(PROC_TLED, &proc_write_tled, &proc_read_tled,
1048                               mode, device);
1049         }
1050
1051         if (hotk->methods->mt_bt_switch) {
1052                 asus_proc_add(PROC_BT, &proc_write_bluetooth,
1053                               &proc_read_bluetooth, mode, device);
1054         }
1055
1056         /*
1057          * We need both read node and write method as LCD switch is also
1058          * accessible from the keyboard
1059          */
1060         if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status) {
1061                 asus_proc_add(PROC_LCD, &proc_write_lcd, &proc_read_lcd, mode,
1062                               device);
1063         }
1064
1065         if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
1066             (hotk->methods->brightness_get && hotk->methods->brightness_set)) {
1067                 asus_proc_add(PROC_BRN, &proc_write_brn, &proc_read_brn, mode,
1068                               device);
1069         }
1070
1071         if (hotk->methods->display_set) {
1072                 asus_proc_add(PROC_DISP, &proc_write_disp, &proc_read_disp,
1073                               mode, device);
1074         }
1075
1076         return 0;
1077 }
1078
1079 static int asus_hotk_remove_fs(struct acpi_device *device)
1080 {
1081         if (acpi_device_dir(device)) {
1082                 remove_proc_entry(PROC_INFO, acpi_device_dir(device));
1083                 if (hotk->methods->mt_wled)
1084                         remove_proc_entry(PROC_WLED, acpi_device_dir(device));
1085                 if (hotk->methods->mt_mled)
1086                         remove_proc_entry(PROC_MLED, acpi_device_dir(device));
1087                 if (hotk->methods->mt_tled)
1088                         remove_proc_entry(PROC_TLED, acpi_device_dir(device));
1089                 if (hotk->methods->mt_ledd)
1090                         remove_proc_entry(PROC_LEDD, acpi_device_dir(device));
1091                 if (hotk->methods->mt_bt_switch)
1092                         remove_proc_entry(PROC_BT, acpi_device_dir(device));
1093                 if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status)
1094                         remove_proc_entry(PROC_LCD, acpi_device_dir(device));
1095                 if ((hotk->methods->brightness_up
1096                      && hotk->methods->brightness_down)
1097                     || (hotk->methods->brightness_get
1098                         && hotk->methods->brightness_set))
1099                         remove_proc_entry(PROC_BRN, acpi_device_dir(device));
1100                 if (hotk->methods->display_set)
1101                         remove_proc_entry(PROC_DISP, acpi_device_dir(device));
1102         }
1103         return 0;
1104 }
1105
1106 static void asus_hotk_notify(acpi_handle handle, u32 event, void *data)
1107 {
1108         /* TODO Find a better way to handle events count. */
1109         if (!hotk)
1110                 return;
1111
1112         if ((event & ~((u32) BR_UP)) < 16)
1113                 hotk->brightness = (event & ~((u32) BR_UP));
1114         else if ((event & ~((u32) BR_DOWN)) < 16)
1115                 hotk->brightness = (event & ~((u32) BR_DOWN));
1116
1117         acpi_bus_generate_proc_event(hotk->device, event,
1118                                 hotk->event_count[event % 128]++);
1119
1120         return;
1121 }
1122
1123 /*
1124  * Match the model string to the list of supported models. Return END_MODEL if
1125  * no match or model is NULL.
1126  */
1127 static int asus_model_match(char *model)
1128 {
1129         if (model == NULL)
1130                 return END_MODEL;
1131
1132         if (strncmp(model, "L3D", 3) == 0)
1133                 return L3D;
1134         else if (strncmp(model, "L2E", 3) == 0 ||
1135                  strncmp(model, "L3H", 3) == 0 || strncmp(model, "L5D", 3) == 0)
1136                 return L3H;
1137         else if (strncmp(model, "L3", 2) == 0 || strncmp(model, "L2B", 3) == 0)
1138                 return L3C;
1139         else if (strncmp(model, "L8L", 3) == 0)
1140                 return L8L;
1141         else if (strncmp(model, "L4R", 3) == 0)
1142                 return L4R;
1143         else if (strncmp(model, "M6N", 3) == 0 || strncmp(model, "W3N", 3) == 0)
1144                 return M6N;
1145         else if (strncmp(model, "M6R", 3) == 0 || strncmp(model, "A3G", 3) == 0)
1146                 return M6R;
1147         else if (strncmp(model, "M2N", 3) == 0 ||
1148                  strncmp(model, "M3N", 3) == 0 ||
1149                  strncmp(model, "M5N", 3) == 0 ||
1150                  strncmp(model, "M6N", 3) == 0 ||
1151                  strncmp(model, "S1N", 3) == 0 ||
1152                  strncmp(model, "S5N", 3) == 0 || strncmp(model, "W1N", 3) == 0)
1153                 return xxN;
1154         else if (strncmp(model, "M1", 2) == 0)
1155                 return M1A;
1156         else if (strncmp(model, "M2", 2) == 0 || strncmp(model, "L4E", 3) == 0)
1157                 return M2E;
1158         else if (strncmp(model, "L2", 2) == 0)
1159                 return L2D;
1160         else if (strncmp(model, "L8", 2) == 0)
1161                 return S1x;
1162         else if (strncmp(model, "D1", 2) == 0)
1163                 return D1x;
1164         else if (strncmp(model, "A1", 2) == 0)
1165                 return A1x;
1166         else if (strncmp(model, "A2", 2) == 0)
1167                 return A2x;
1168         else if (strncmp(model, "J1", 2) == 0)
1169                 return S2x;
1170         else if (strncmp(model, "L5", 2) == 0)
1171                 return L5x;
1172         else if (strncmp(model, "A4G", 3) == 0)
1173                 return A4G;
1174         else if (strncmp(model, "W1N", 3) == 0)
1175                 return W1N;
1176         else if (strncmp(model, "W3V", 3) == 0)
1177                 return W3V;
1178         else if (strncmp(model, "W5A", 3) == 0)
1179                 return W5A;
1180         else if (strncmp(model, "R1F", 3) == 0)
1181                 return R1F;
1182         else if (strncmp(model, "A4S", 3) == 0)
1183                 return A4S;
1184         else if (strncmp(model, "F3Sa", 4) == 0)
1185                 return F3Sa;
1186         else
1187                 return END_MODEL;
1188 }
1189
1190 /*
1191  * This function is used to initialize the hotk with right values. In this
1192  * method, we can make all the detection we want, and modify the hotk struct
1193  */
1194 static int asus_hotk_get_info(void)
1195 {
1196         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1197         union acpi_object *model = NULL;
1198         int bsts_result;
1199         char *string = NULL;
1200         acpi_status status;
1201
1202         /*
1203          * Get DSDT headers early enough to allow for differentiating between
1204          * models, but late enough to allow acpi_bus_register_driver() to fail
1205          * before doing anything ACPI-specific. Should we encounter a machine,
1206          * which needs special handling (i.e. its hotkey device has a different
1207          * HID), this bit will be moved. A global variable asus_info contains
1208          * the DSDT header.
1209          */
1210         status = acpi_get_table(ACPI_SIG_DSDT, 1, &asus_info);
1211         if (ACPI_FAILURE(status))
1212                 printk(KERN_WARNING "  Couldn't get the DSDT table header\n");
1213
1214         /* We have to write 0 on init this far for all ASUS models */
1215         if (!write_acpi_int(hotk->handle, "INIT", 0, &buffer)) {
1216                 printk(KERN_ERR "  Hotkey initialization failed\n");
1217                 return -ENODEV;
1218         }
1219
1220         /* This needs to be called for some laptops to init properly */
1221         if (!read_acpi_int(hotk->handle, "BSTS", &bsts_result))
1222                 printk(KERN_WARNING "  Error calling BSTS\n");
1223         else if (bsts_result)
1224                 printk(KERN_NOTICE "  BSTS called, 0x%02x returned\n",
1225                        bsts_result);
1226
1227         /*
1228          * Try to match the object returned by INIT to the specific model.
1229          * Handle every possible object (or the lack of thereof) the DSDT
1230          * writers might throw at us. When in trouble, we pass NULL to
1231          * asus_model_match() and try something completely different.
1232          */
1233         if (buffer.pointer) {
1234                 model = buffer.pointer;
1235                 switch (model->type) {
1236                 case ACPI_TYPE_STRING:
1237                         string = model->string.pointer;
1238                         break;
1239                 case ACPI_TYPE_BUFFER:
1240                         string = model->buffer.pointer;
1241                         break;
1242                 default:
1243                         kfree(model);
1244                         model = NULL;
1245                         break;
1246                 }
1247         }
1248         hotk->model = asus_model_match(string);
1249         if (hotk->model == END_MODEL) { /* match failed */
1250                 if (asus_info &&
1251                     strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) {
1252                         hotk->model = P30;
1253                         printk(KERN_NOTICE
1254                                "  Samsung P30 detected, supported\n");
1255                 } else {
1256                         hotk->model = M2E;
1257                         printk(KERN_NOTICE "  unsupported model %s, trying "
1258                                "default values\n", string);
1259                         printk(KERN_NOTICE
1260                                "  send /proc/acpi/dsdt to the developers\n");
1261                         kfree(model);
1262                         return -ENODEV;
1263                 }
1264                 hotk->methods = &model_conf[hotk->model];
1265                 return AE_OK;
1266         }
1267         hotk->methods = &model_conf[hotk->model];
1268         printk(KERN_NOTICE "  %s model detected, supported\n", string);
1269
1270         /* Sort of per-model blacklist */
1271         if (strncmp(string, "L2B", 3) == 0)
1272                 hotk->methods->lcd_status = NULL;
1273         /* L2B is similar enough to L3C to use its settings, with this only
1274            exception */
1275         else if (strncmp(string, "A3G", 3) == 0)
1276                 hotk->methods->lcd_status = "\\BLFG";
1277         /* A3G is like M6R */
1278         else if (strncmp(string, "S5N", 3) == 0 ||
1279                  strncmp(string, "M5N", 3) == 0 ||
1280                  strncmp(string, "W3N", 3) == 0)
1281                 hotk->methods->mt_mled = NULL;
1282         /* S5N, M5N and W3N have no MLED */
1283         else if (strncmp(string, "L5D", 3) == 0)
1284                 hotk->methods->mt_wled = NULL;
1285         /* L5D's WLED is not controlled by ACPI */
1286         else if (strncmp(string, "M2N", 3) == 0 ||
1287                  strncmp(string, "W3V", 3) == 0 ||
1288                  strncmp(string, "S1N", 3) == 0)
1289                 hotk->methods->mt_wled = "WLED";
1290         /* M2N, S1N and W3V have a usable WLED */
1291         else if (asus_info) {
1292                 if (strncmp(asus_info->oem_table_id, "L1", 2) == 0)
1293                         hotk->methods->mled_status = NULL;
1294                 /* S1300A reports L84F, but L1400B too, account for that */
1295         }
1296
1297         kfree(model);
1298
1299         return AE_OK;
1300 }
1301
1302 static int asus_hotk_check(void)
1303 {
1304         int result = 0;
1305
1306         result = acpi_bus_get_status(hotk->device);
1307         if (result)
1308                 return result;
1309
1310         if (hotk->device->status.present) {
1311                 result = asus_hotk_get_info();
1312         } else {
1313                 printk(KERN_ERR "  Hotkey device not present, aborting\n");
1314                 return -EINVAL;
1315         }
1316
1317         return result;
1318 }
1319
1320 static int asus_hotk_found;
1321
1322 static int asus_hotk_add(struct acpi_device *device)
1323 {
1324         acpi_status status = AE_OK;
1325         int result;
1326
1327         if (!device)
1328                 return -EINVAL;
1329
1330         printk(KERN_NOTICE "Asus Laptop ACPI Extras version %s\n",
1331                ASUS_ACPI_VERSION);
1332
1333         hotk = kzalloc(sizeof(struct asus_hotk), GFP_KERNEL);
1334         if (!hotk)
1335                 return -ENOMEM;
1336
1337         hotk->handle = device->handle;
1338         strcpy(acpi_device_name(device), ACPI_HOTK_DEVICE_NAME);
1339         strcpy(acpi_device_class(device), ACPI_HOTK_CLASS);
1340         device->driver_data = hotk;
1341         hotk->device = device;
1342
1343         result = asus_hotk_check();
1344         if (result)
1345                 goto end;
1346
1347         result = asus_hotk_add_fs(device);
1348         if (result)
1349                 goto end;
1350
1351         /*
1352          * We install the handler, it will receive the hotk in parameter, so, we
1353          * could add other data to the hotk struct
1354          */
1355         status = acpi_install_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1356                                              asus_hotk_notify, hotk);
1357         if (ACPI_FAILURE(status))
1358                 printk(KERN_ERR "  Error installing notify handler\n");
1359
1360         /* For laptops without GPLV: init the hotk->brightness value */
1361         if ((!hotk->methods->brightness_get)
1362             && (!hotk->methods->brightness_status)
1363             && (hotk->methods->brightness_up && hotk->methods->brightness_down)) {
1364                 status =
1365                     acpi_evaluate_object(NULL, hotk->methods->brightness_down,
1366                                          NULL, NULL);
1367                 if (ACPI_FAILURE(status))
1368                         printk(KERN_WARNING "  Error changing brightness\n");
1369                 else {
1370                         status =
1371                             acpi_evaluate_object(NULL,
1372                                                  hotk->methods->brightness_up,
1373                                                  NULL, NULL);
1374                         if (ACPI_FAILURE(status))
1375                                 printk(KERN_WARNING "  Strange, error changing"
1376                                        " brightness\n");
1377                 }
1378         }
1379
1380         asus_hotk_found = 1;
1381
1382         /* LED display is off by default */
1383         hotk->ledd_status = 0xFFF;
1384
1385 end:
1386         if (result)
1387                 kfree(hotk);
1388
1389         return result;
1390 }
1391
1392 static int asus_hotk_remove(struct acpi_device *device, int type)
1393 {
1394         acpi_status status = 0;
1395
1396         if (!device || !acpi_driver_data(device))
1397                 return -EINVAL;
1398
1399         status = acpi_remove_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1400                                             asus_hotk_notify);
1401         if (ACPI_FAILURE(status))
1402                 printk(KERN_ERR "Asus ACPI: Error removing notify handler\n");
1403
1404         asus_hotk_remove_fs(device);
1405
1406         kfree(hotk);
1407
1408         return 0;
1409 }
1410
1411 static struct backlight_ops asus_backlight_data = {
1412         .get_brightness = read_brightness,
1413         .update_status  = set_brightness_status,
1414 };
1415
1416 static void asus_acpi_exit(void)
1417 {
1418         if (asus_backlight_device)
1419                 backlight_device_unregister(asus_backlight_device);
1420
1421         acpi_bus_unregister_driver(&asus_hotk_driver);
1422         remove_proc_entry(PROC_ASUS, acpi_root_dir);
1423
1424         return;
1425 }
1426
1427 static int __init asus_acpi_init(void)
1428 {
1429         int result;
1430
1431         if (acpi_disabled)
1432                 return -ENODEV;
1433
1434         asus_proc_dir = proc_mkdir(PROC_ASUS, acpi_root_dir);
1435         if (!asus_proc_dir) {
1436                 printk(KERN_ERR "Asus ACPI: Unable to create /proc entry\n");
1437                 return -ENODEV;
1438         }
1439         asus_proc_dir->owner = THIS_MODULE;
1440
1441         result = acpi_bus_register_driver(&asus_hotk_driver);
1442         if (result < 0) {
1443                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1444                 return result;
1445         }
1446
1447         /*
1448          * This is a bit of a kludge.  We only want this module loaded
1449          * for ASUS systems, but there's currently no way to probe the
1450          * ACPI namespace for ASUS HIDs.  So we just return failure if
1451          * we didn't find one, which will cause the module to be
1452          * unloaded.
1453          */
1454         if (!asus_hotk_found) {
1455                 acpi_bus_unregister_driver(&asus_hotk_driver);
1456                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1457                 return -ENODEV;
1458         }
1459
1460         asus_backlight_device = backlight_device_register("asus", NULL, NULL,
1461                                                           &asus_backlight_data);
1462         if (IS_ERR(asus_backlight_device)) {
1463                 printk(KERN_ERR "Could not register asus backlight device\n");
1464                 asus_backlight_device = NULL;
1465                 asus_acpi_exit();
1466                 return -ENODEV;
1467         }
1468         asus_backlight_device->props.max_brightness = 15;
1469
1470         return 0;
1471 }
1472
1473 module_init(asus_acpi_init);
1474 module_exit(asus_acpi_exit);