drivers/acpi/asus_acpi.c

   1 /*
   2  *  asus_acpi.c - Asus Laptop ACPI Extras
   3  *
   4  *
   5  *  Copyright (C) 2002-2005 Julien Lerouge, 2003-2006 Karol Kozimor
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *
  22  *  The development page for this driver is located at
  23  *  http://sourceforge.net/projects/acpi4asus/
  24  *
  25  *  Credits:
  26  *  Pontus Fuchs   - Helper functions, cleanup
  27  *  Johann Wiesner - Small compile fixes
  28  *  John Belmonte  - ACPI code for Toshiba laptop was a good starting point.
  29  *  �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.\n");
  82 module_param(asus_gid, uint, 0);
  83 MODULE_PARM_DESC(asus_gid, "GID for entries in /proc/acpi/asus.\n");
  84
  85 /* For each model, all features implemented,
  86  * those marked with R are relative to HOTK, A for absolute */
  87 struct model_data {
  88         char *name;             //name of the laptop________________A
  89         char *mt_mled;          //method to handle mled_____________R
  90         char *mled_status;      //node to handle mled reading_______A
  91         char *mt_wled;          //method to handle wled_____________R
  92         char *wled_status;      //node to handle wled reading_______A
  93         char *mt_tled;          //method to handle tled_____________R
  94         char *tled_status;      //node to handle tled reading_______A
  95         char *mt_ledd;          //method to handle LED display______R
  96         char *mt_bt_switch;     //method to switch Bluetooth on/off_R
  97         char *bt_status;        //no model currently supports this__?
  98         char *mt_lcd_switch;    //method to turn LCD on/off_________A
  99         char *lcd_status;       //node to read LCD panel state______A
 100         char *brightness_up;    //method to set brightness up_______A
 101         char *brightness_down;  //guess what ?______________________A
 102         char *brightness_set;   //method to set absolute brightness_R
 103         char *brightness_get;   //method to get absolute brightness_R
 104         char *brightness_status;        //node to get brightness____________A
 105         char *display_set;      //method to set video output________R
 106         char *display_get;      //method to get video output________R
 107 };
 108
 109 /*
 110  * This is the main structure, we can use it to store anything interesting
 111  * about the hotk device
 112  */
 113 struct asus_hotk {
 114         struct acpi_device *device;     //the device we are in
 115         acpi_handle handle;     //the handle of the hotk device
 116         char status;            //status of the hotk, for LEDs, ...
 117         u32 ledd_status;        //status of the LED display
 118         struct model_data *methods;     //methods available on the laptop
 119         u8 brightness;          //brightness level
 120         enum {
 121                 A1x = 0,        //A1340D, A1300F
 122                 A2x,            //A2500H
 123                 A4G,            //A4700G
 124                 D1x,            //D1
 125                 L2D,            //L2000D
 126                 L3C,            //L3800C
 127                 L3D,            //L3400D
 128                 L3H,            //L3H, L2000E, L5D
 129                 L4R,            //L4500R
 130                 L5x,            //L5800C
 131                 L8L,            //L8400L
 132                 M1A,            //M1300A
 133                 M2E,            //M2400E, L4400L
 134                 M6N,            //M6800N, W3400N
 135                 M6R,            //M6700R, A3000G
 136                 P30,            //Samsung P30
 137                 S1x,            //S1300A, but also L1400B and M2400A (L84F)
 138                 S2x,            //S200 (J1 reported), Victor MP-XP7210
 139                 W1N,            //W1000N
 140                 W5A,            //W5A
 141                 W3V,            //W3030V
 142                 xxN,            //M2400N, M3700N, M5200N, M6800N, S1300N, S5200N
 143                 A4S,            //Z81sp
 144                 //(Centrino)
 145                 END_MODEL
 146         } model;                //Models currently supported
 147         u16 event_count[128];   //count for each event TODO make this better
 148 };
 149
 150 /* Here we go */
 151 #define A1x_PREFIX "\\_SB.PCI0.ISA.EC0."
 152 #define L3C_PREFIX "\\_SB.PCI0.PX40.ECD0."
 153 #define M1A_PREFIX "\\_SB.PCI0.PX40.EC0."
 154 #define P30_PREFIX "\\_SB.PCI0.LPCB.EC0."
 155 #define S1x_PREFIX "\\_SB.PCI0.PX40."
 156 #define S2x_PREFIX A1x_PREFIX
 157 #define xxN_PREFIX "\\_SB.PCI0.SBRG.EC0."
 158
 159 static struct model_data model_conf[END_MODEL] = {
 160         /*
 161          * TODO I have seen a SWBX and AIBX method on some models, like L1400B,
 162          * it seems to be a kind of switch, but what for ?
 163          */
 164
 165         {
 166          .name = "A1x",
 167          .mt_mled = "MLED",
 168          .mled_status = "\\MAIL",
 169          .mt_lcd_switch = A1x_PREFIX "_Q10",
 170          .lcd_status = "\\BKLI",
 171          .brightness_up = A1x_PREFIX "_Q0E",
 172          .brightness_down = A1x_PREFIX "_Q0F"},
 173
 174         {
 175          .name = "A2x",
 176          .mt_mled = "MLED",
 177          .mt_wled = "WLED",
 178          .wled_status = "\\SG66",
 179          .mt_lcd_switch = "\\Q10",
 180          .lcd_status = "\\BAOF",
 181          .brightness_set = "SPLV",
 182          .brightness_get = "GPLV",
 183          .display_set = "SDSP",
 184          .display_get = "\\INFB"},
 185
 186         {
 187          .name = "A4G",
 188          .mt_mled = "MLED",
 189 /* WLED present, but not controlled by ACPI */
 190          .mt_lcd_switch = xxN_PREFIX "_Q10",
 191          .brightness_set = "SPLV",
 192          .brightness_get = "GPLV",
 193          .display_set = "SDSP",
 194          .display_get = "\\ADVG"},
 195
 196         {
 197          .name = "D1x",
 198          .mt_mled = "MLED",
 199          .mt_lcd_switch = "\\Q0D",
 200          .lcd_status = "\\GP11",
 201          .brightness_up = "\\Q0C",
 202          .brightness_down = "\\Q0B",
 203          .brightness_status = "\\BLVL",
 204          .display_set = "SDSP",
 205          .display_get = "\\INFB"},
 206
 207         {
 208          .name = "L2D",
 209          .mt_mled = "MLED",
 210          .mled_status = "\\SGP6",
 211          .mt_wled = "WLED",
 212          .wled_status = "\\RCP3",
 213          .mt_lcd_switch = "\\Q10",
 214          .lcd_status = "\\SGP0",
 215          .brightness_up = "\\Q0E",
 216          .brightness_down = "\\Q0F",
 217          .display_set = "SDSP",
 218          .display_get = "\\INFB"},
 219
 220         {
 221          .name = "L3C",
 222          .mt_mled = "MLED",
 223          .mt_wled = "WLED",
 224          .mt_lcd_switch = L3C_PREFIX "_Q10",
 225          .lcd_status = "\\GL32",
 226          .brightness_set = "SPLV",
 227          .brightness_get = "GPLV",
 228          .display_set = "SDSP",
 229          .display_get = "\\_SB.PCI0.PCI1.VGAC.NMAP"},
 230
 231         {
 232          .name = "L3D",
 233          .mt_mled = "MLED",
 234          .mled_status = "\\MALD",
 235          .mt_wled = "WLED",
 236          .mt_lcd_switch = "\\Q10",
 237          .lcd_status = "\\BKLG",
 238          .brightness_set = "SPLV",
 239          .brightness_get = "GPLV",
 240          .display_set = "SDSP",
 241          .display_get = "\\INFB"},
 242
 243         {
 244          .name = "L3H",
 245          .mt_mled = "MLED",
 246          .mt_wled = "WLED",
 247          .mt_lcd_switch = "EHK",
 248          .lcd_status = "\\_SB.PCI0.PM.PBC",
 249          .brightness_set = "SPLV",
 250          .brightness_get = "GPLV",
 251          .display_set = "SDSP",
 252          .display_get = "\\INFB"},
 253
 254         {
 255          .name = "L4R",
 256          .mt_mled = "MLED",
 257          .mt_wled = "WLED",
 258          .wled_status = "\\_SB.PCI0.SBRG.SG13",
 259          .mt_lcd_switch = xxN_PREFIX "_Q10",
 260          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
 261          .brightness_set = "SPLV",
 262          .brightness_get = "GPLV",
 263          .display_set = "SDSP",
 264          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
 265
 266         {
 267          .name = "L5x",
 268          .mt_mled = "MLED",
 269 /* WLED present, but not controlled by ACPI */
 270          .mt_tled = "TLED",
 271          .mt_lcd_switch = "\\Q0D",
 272          .lcd_status = "\\BAOF",
 273          .brightness_set = "SPLV",
 274          .brightness_get = "GPLV",
 275          .display_set = "SDSP",
 276          .display_get = "\\INFB"},
 277
 278         {
 279          .name = "L8L"
 280 /* No features, but at least support the hotkeys */
 281          },
 282
 283         {
 284          .name = "M1A",
 285          .mt_mled = "MLED",
 286          .mt_lcd_switch = M1A_PREFIX "Q10",
 287          .lcd_status = "\\PNOF",
 288          .brightness_up = M1A_PREFIX "Q0E",
 289          .brightness_down = M1A_PREFIX "Q0F",
 290          .brightness_status = "\\BRIT",
 291          .display_set = "SDSP",
 292          .display_get = "\\INFB"},
 293
 294         {
 295          .name = "M2E",
 296          .mt_mled = "MLED",
 297          .mt_wled = "WLED",
 298          .mt_lcd_switch = "\\Q10",
 299          .lcd_status = "\\GP06",
 300          .brightness_set = "SPLV",
 301          .brightness_get = "GPLV",
 302          .display_set = "SDSP",
 303          .display_get = "\\INFB"},
 304
 305         {
 306          .name = "M6N",
 307          .mt_mled = "MLED",
 308          .mt_wled = "WLED",
 309          .wled_status = "\\_SB.PCI0.SBRG.SG13",
 310          .mt_lcd_switch = xxN_PREFIX "_Q10",
 311          .lcd_status = "\\_SB.BKLT",
 312          .brightness_set = "SPLV",
 313          .brightness_get = "GPLV",
 314          .display_set = "SDSP",
 315          .display_get = "\\SSTE"},
 316
 317         {
 318          .name = "M6R",
 319          .mt_mled = "MLED",
 320          .mt_wled = "WLED",
 321          .mt_lcd_switch = xxN_PREFIX "_Q10",
 322          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
 323          .brightness_set = "SPLV",
 324          .brightness_get = "GPLV",
 325          .display_set = "SDSP",
 326          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
 327
 328         {
 329          .name = "P30",
 330          .mt_wled = "WLED",
 331          .mt_lcd_switch = P30_PREFIX "_Q0E",
 332          .lcd_status = "\\BKLT",
 333          .brightness_up = P30_PREFIX "_Q68",
 334          .brightness_down = P30_PREFIX "_Q69",
 335          .brightness_get = "GPLV",
 336          .display_set = "SDSP",
 337          .display_get = "\\DNXT"},
 338
 339         {
 340          .name = "S1x",
 341          .mt_mled = "MLED",
 342          .mled_status = "\\EMLE",
 343          .mt_wled = "WLED",
 344          .mt_lcd_switch = S1x_PREFIX "Q10",
 345          .lcd_status = "\\PNOF",
 346          .brightness_set = "SPLV",
 347          .brightness_get = "GPLV"},
 348
 349         {
 350          .name = "S2x",
 351          .mt_mled = "MLED",
 352          .mled_status = "\\MAIL",
 353          .mt_lcd_switch = S2x_PREFIX "_Q10",
 354          .lcd_status = "\\BKLI",
 355          .brightness_up = S2x_PREFIX "_Q0B",
 356          .brightness_down = S2x_PREFIX "_Q0A"},
 357
 358         {
 359          .name = "W1N",
 360          .mt_mled = "MLED",
 361          .mt_wled = "WLED",
 362          .mt_ledd = "SLCM",
 363          .mt_lcd_switch = xxN_PREFIX "_Q10",
 364          .lcd_status = "\\BKLT",
 365          .brightness_set = "SPLV",
 366          .brightness_get = "GPLV",
 367          .display_set = "SDSP",
 368          .display_get = "\\ADVG"},
 369
 370         {
 371          .name = "W5A",
 372          .mt_bt_switch = "BLED",
 373          .mt_wled = "WLED",
 374          .mt_lcd_switch = xxN_PREFIX "_Q10",
 375          .brightness_set = "SPLV",
 376          .brightness_get = "GPLV",
 377          .display_set = "SDSP",
 378          .display_get = "\\ADVG"},
 379
 380         {
 381          .name = "W3V",
 382          .mt_mled = "MLED",
 383          .mt_wled = "WLED",
 384          .mt_lcd_switch = xxN_PREFIX "_Q10",
 385          .lcd_status = "\\BKLT",
 386          .brightness_set = "SPLV",
 387          .brightness_get = "GPLV",
 388          .display_set = "SDSP",
 389          .display_get = "\\INFB"},
 390
 391        {
 392          .name = "xxN",
 393          .mt_mled = "MLED",
 394 /* WLED present, but not controlled by ACPI */
 395          .mt_lcd_switch = xxN_PREFIX "_Q10",
 396          .lcd_status = "\\BKLT",
 397          .brightness_set = "SPLV",
 398          .brightness_get = "GPLV",
 399          .display_set = "SDSP",
 400         .display_get = "\\ADVG"},
 401
 402         {
 403                 .name              = "A4S",
 404                 .brightness_set    = "SPLV",
 405                 .brightness_get    = "GPLV",
 406                 .mt_bt_switch      = "BLED",
 407                 .mt_wled           = "WLED"
 408         }
 409
 410 };
 411
 412 /* procdir we use */
 413 static struct proc_dir_entry *asus_proc_dir;
 414
 415 static struct backlight_device *asus_backlight_device;
 416
 417 /*
 418  * This header is made available to allow proper configuration given model,
 419  * revision number , ... this info cannot go in struct asus_hotk because it is
 420  * available before the hotk
 421  */
 422 static struct acpi_table_header *asus_info;
 423
 424 /* The actual device the driver binds to */
 425 static struct asus_hotk *hotk;
 426
 427 /*
 428  * The hotkey driver and autoloading declaration
 429  */
 430 static int asus_hotk_add(struct acpi_device *device);
 431 static int asus_hotk_remove(struct acpi_device *device, int type);
 432 static const struct acpi_device_id asus_device_ids[] = {
 433         {"ATK0100", 0},
 434         {"", 0},
 435 };
 436 MODULE_DEVICE_TABLE(acpi, asus_device_ids);
 437
 438 static struct acpi_driver asus_hotk_driver = {
 439         .name = "asus_acpi",
 440         .class = ACPI_HOTK_CLASS,
 441         .ids = asus_device_ids,
 442         .ops = {
 443                 .add = asus_hotk_add,
 444                 .remove = asus_hotk_remove,
 445                 },
 446 };
 447
 448 /*
 449  * This function evaluates an ACPI method, given an int as parameter, the
 450  * method is searched within the scope of the handle, can be NULL. The output
 451  * of the method is written is output, which can also be NULL
 452  *
 453  * returns 1 if write is successful, 0 else.
 454  */
 455 static int write_acpi_int(acpi_handle handle, const char *method, int val,
 456                           struct acpi_buffer *output)
 457 {
 458         struct acpi_object_list params; //list of input parameters (an int here)
 459         union acpi_object in_obj;       //the only param we use
 460         acpi_status status;
 461
 462         params.count = 1;
 463         params.pointer = &in_obj;
 464         in_obj.type = ACPI_TYPE_INTEGER;
 465         in_obj.integer.value = val;
 466
 467         status = acpi_evaluate_object(handle, (char *)method, &params, output);
 468         return (status == AE_OK);
 469 }
 470
 471 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
 472 {
 473         struct acpi_buffer output;
 474         union acpi_object out_obj;
 475         acpi_status status;
 476
 477         output.length = sizeof(out_obj);
 478         output.pointer = &out_obj;
 479
 480         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
 481         *val = out_obj.integer.value;
 482         return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
 483 }
 484
 485 /*
 486  * We write our info in page, we begin at offset off and cannot write more
 487  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 488  * number of bytes written in page
 489  */
 490 static int
 491 proc_read_info(char *page, char **start, off_t off, int count, int *eof,
 492                void *data)
 493 {
 494         int len = 0;
 495         int temp;
 496         char buf[16];           //enough for all info
 497         /*
 498          * We use the easy way, we don't care of off and count, so we don't set eof
 499          * to 1
 500          */
 501
 502         len += sprintf(page, ACPI_HOTK_NAME " " ASUS_ACPI_VERSION "\n");
 503         len += sprintf(page + len, "Model reference    : %s\n",
 504                        hotk->methods->name);
 505         /*
 506          * The SFUN method probably allows the original driver to get the list
 507          * of features supported by a given model. For now, 0x0100 or 0x0800
 508          * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
 509          * The significance of others is yet to be found.
 510          */
 511         if (read_acpi_int(hotk->handle, "SFUN", &temp))
 512                 len +=
 513                     sprintf(page + len, "SFUN value         : 0x%04x\n", temp);
 514         /*
 515          * Another value for userspace: the ASYM method returns 0x02 for
 516          * battery low and 0x04 for battery critical, its readings tend to be
 517          * more accurate than those provided by _BST.
 518          * Note: since not all the laptops provide this method, errors are
 519          * silently ignored.
 520          */
 521         if (read_acpi_int(hotk->handle, "ASYM", &temp))
 522                 len +=
 523                     sprintf(page + len, "ASYM value         : 0x%04x\n", temp);
 524         if (asus_info) {
 525                 snprintf(buf, 16, "%d", asus_info->length);
 526                 len += sprintf(page + len, "DSDT length        : %s\n", buf);
 527                 snprintf(buf, 16, "%d", asus_info->checksum);
 528                 len += sprintf(page + len, "DSDT checksum      : %s\n", buf);
 529                 snprintf(buf, 16, "%d", asus_info->revision);
 530                 len += sprintf(page + len, "DSDT revision      : %s\n", buf);
 531                 snprintf(buf, 7, "%s", asus_info->oem_id);
 532                 len += sprintf(page + len, "OEM id             : %s\n", buf);
 533                 snprintf(buf, 9, "%s", asus_info->oem_table_id);
 534                 len += sprintf(page + len, "OEM table id       : %s\n", buf);
 535                 snprintf(buf, 16, "%x", asus_info->oem_revision);
 536                 len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);
 537                 snprintf(buf, 5, "%s", asus_info->asl_compiler_id);
 538                 len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
 539                 snprintf(buf, 16, "%x", asus_info->asl_compiler_revision);
 540                 len += sprintf(page + len, "ASL comp revision  : 0x%s\n", buf);
 541         }
 542
 543         return len;
 544 }
 545
 546 /*
 547  * /proc handlers
 548  * We write our info in page, we begin at offset off and cannot write more
 549  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 550  * number of bytes written in page
 551  */
 552
 553 /* Generic LED functions */
 554 static int read_led(const char *ledname, int ledmask)
 555 {
 556         if (ledname) {
 557                 int led_status;
 558
 559                 if (read_acpi_int(NULL, ledname, &led_status))
 560                         return led_status;
 561                 else
 562                         printk(KERN_WARNING "Asus ACPI: Error reading LED "
 563                                "status\n");
 564         }
 565         return (hotk->status & ledmask) ? 1 : 0;
 566 }
 567
 568 static int parse_arg(const char __user * buf, unsigned long count, int *val)
 569 {
 570         char s[32];
 571         if (!count)
 572                 return 0;
 573         if (count > 31)
 574                 return -EINVAL;
 575         if (copy_from_user(s, buf, count))
 576                 return -EFAULT;
 577         s[count] = 0;
 578         if (sscanf(s, "%i", val) != 1)
 579                 return -EINVAL;
 580         return count;
 581 }
 582
 583 /* FIXME: kill extraneous args so it can be called independently */
 584 static int
 585 write_led(const char __user * buffer, unsigned long count,
 586           char *ledname, int ledmask, int invert)
 587 {
 588         int rv, value;
 589         int led_out = 0;
 590
 591         rv = parse_arg(buffer, count, &value);
 592         if (rv > 0)
 593                 led_out = value ? 1 : 0;
 594
 595         hotk->status =
 596             (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);
 597
 598         if (invert)             /* invert target value */
 599                 led_out = !led_out & 0x1;
 600
 601         if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
 602                 printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",
 603                        ledname);
 604
 605         return rv;
 606 }
 607
 608 /*
 609  * Proc handlers for MLED
 610  */
 611 static int
 612 proc_read_mled(char *page, char **start, off_t off, int count, int *eof,
 613                void *data)
 614 {
 615         return sprintf(page, "%d\n",
 616                        read_led(hotk->methods->mled_status, MLED_ON));
 617 }
 618
 619 static int
 620 proc_write_mled(struct file *file, const char __user * buffer,
 621                 unsigned long count, void *data)
 622 {
 623         return write_led(buffer, count, hotk->methods->mt_mled, MLED_ON, 1);
 624 }
 625
 626 /*
 627  * Proc handlers for LED display
 628  */
 629 static int
 630 proc_read_ledd(char *page, char **start, off_t off, int count, int *eof,
 631                void *data)
 632 {
 633         return sprintf(page, "0x%08x\n", hotk->ledd_status);
 634 }
 635
 636 static int
 637 proc_write_ledd(struct file *file, const char __user * buffer,
 638                 unsigned long count, void *data)
 639 {
 640         int rv, value;
 641
 642         rv = parse_arg(buffer, count, &value);
 643         if (rv > 0) {
 644                 if (!write_acpi_int
 645                     (hotk->handle, hotk->methods->mt_ledd, value, NULL))
 646                         printk(KERN_WARNING
 647                                "Asus ACPI: LED display write failed\n");
 648                 else
 649                         hotk->ledd_status = (u32) value;
 650         }
 651         return rv;
 652 }
 653
 654 /*
 655  * Proc handlers for WLED
 656  */
 657 static int
 658 proc_read_wled(char *page, char **start, off_t off, int count, int *eof,
 659                void *data)
 660 {
 661         return sprintf(page, "%d\n",
 662                        read_led(hotk->methods->wled_status, WLED_ON));
 663 }
 664
 665 static int
 666 proc_write_wled(struct file *file, const char __user * buffer,
 667                 unsigned long count, void *data)
 668 {
 669         return write_led(buffer, count, hotk->methods->mt_wled, WLED_ON, 0);
 670 }
 671
 672 /*
 673  * Proc handlers for Bluetooth
 674  */
 675 static int
 676 proc_read_bluetooth(char *page, char **start, off_t off, int count, int *eof,
 677                     void *data)
 678 {
 679         return sprintf(page, "%d\n", read_led(hotk->methods->bt_status, BT_ON));
 680 }
 681
 682 static int
 683 proc_write_bluetooth(struct file *file, const char __user * buffer,
 684                      unsigned long count, void *data)
 685 {
 686         /* Note: mt_bt_switch controls both internal Bluetooth adapter's
 687            presence and its LED */
 688         return write_led(buffer, count, hotk->methods->mt_bt_switch, BT_ON, 0);
 689 }
 690
 691 /*
 692  * Proc handlers for TLED
 693  */
 694 static int
 695 proc_read_tled(char *page, char **start, off_t off, int count, int *eof,
 696                void *data)
 697 {
 698         return sprintf(page, "%d\n",
 699                        read_led(hotk->methods->tled_status, TLED_ON));
 700 }
 701
 702 static int
 703 proc_write_tled(struct file *file, const char __user * buffer,
 704                 unsigned long count, void *data)
 705 {
 706         return write_led(buffer, count, hotk->methods->mt_tled, TLED_ON, 0);
 707 }
 708
 709 static int get_lcd_state(void)
 710 {
 711         int lcd = 0;
 712
 713         if (hotk->model != L3H) {
 714                 /* We don't have to check anything if we are here */
 715                 if (!read_acpi_int(NULL, hotk->methods->lcd_status, &lcd))
 716                         printk(KERN_WARNING
 717                                "Asus ACPI: Error reading LCD status\n");
 718
 719                 if (hotk->model == L2D)
 720                         lcd = ~lcd;
 721         } else {                /* L3H and the like have to be handled differently */
 722                 acpi_status status = 0;
 723                 struct acpi_object_list input;
 724                 union acpi_object mt_params[2];
 725                 struct acpi_buffer output;
 726                 union acpi_object out_obj;
 727
 728                 input.count = 2;
 729                 input.pointer = mt_params;
 730                 /* Note: the following values are partly guessed up, but
 731                    otherwise they seem to work */
 732                 mt_params[0].type = ACPI_TYPE_INTEGER;
 733                 mt_params[0].integer.value = 0x02;
 734                 mt_params[1].type = ACPI_TYPE_INTEGER;
 735                 mt_params[1].integer.value = 0x02;
 736
 737                 output.length = sizeof(out_obj);
 738                 output.pointer = &out_obj;
 739
 740                 status =
 741                     acpi_evaluate_object(NULL, hotk->methods->lcd_status,
 742                                          &input, &output);
 743                 if (status != AE_OK)
 744                         return -1;
 745                 if (out_obj.type == ACPI_TYPE_INTEGER)
 746                         /* That's what the AML code does */
 747                         lcd = out_obj.integer.value >> 8;
 748         }
 749
 750         return (lcd & 1);
 751 }
 752
 753 static int set_lcd_state(int value)
 754 {
 755         int lcd = 0;
 756         acpi_status status = 0;
 757
 758         lcd = value ? 1 : 0;
 759         if (lcd != get_lcd_state()) {
 760                 /* switch */
 761                 if (hotk->model != L3H) {
 762                         status =
 763                             acpi_evaluate_object(NULL,
 764                                                  hotk->methods->mt_lcd_switch,
 765                                                  NULL, NULL);
 766                 } else {        /* L3H and the like have to be handled differently */
 767                         if (!write_acpi_int
 768                             (hotk->handle, hotk->methods->mt_lcd_switch, 0x07,
 769                              NULL))
 770                                 status = AE_ERROR;
 771                         /* L3H's AML executes EHK (0x07) upon Fn+F7 keypress,
 772                            the exact behaviour is simulated here */
 773                 }
 774                 if (ACPI_FAILURE(status))
 775                         printk(KERN_WARNING "Asus ACPI: Error switching LCD\n");
 776         }
 777         return 0;
 778
 779 }
 780
 781 static int
 782 proc_read_lcd(char *page, char **start, off_t off, int count, int *eof,
 783               void *data)
 784 {
 785         return sprintf(page, "%d\n", get_lcd_state());
 786 }
 787
 788 static int
 789 proc_write_lcd(struct file *file, const char __user * buffer,
 790                unsigned long count, void *data)
 791 {
 792         int rv, value;
 793
 794         rv = parse_arg(buffer, count, &value);
 795         if (rv > 0)
 796                 set_lcd_state(value);
 797         return rv;
 798 }
 799
 800 static int read_brightness(struct backlight_device *bd)
 801 {
 802         int value;
 803
 804         if (hotk->methods->brightness_get) {    /* SPLV/GPLV laptop */
 805                 if (!read_acpi_int(hotk->handle, hotk->methods->brightness_get,
 806                                    &value))
 807                         printk(KERN_WARNING
 808                                "Asus ACPI: Error reading brightness\n");
 809         } else if (hotk->methods->brightness_status) {  /* For D1 for example */
 810                 if (!read_acpi_int(NULL, hotk->methods->brightness_status,
 811                                    &value))
 812                         printk(KERN_WARNING
 813                                "Asus ACPI: Error reading brightness\n");
 814         } else                  /* No GPLV method */
 815                 value = hotk->brightness;
 816         return value;
 817 }
 818
 819 /*
 820  * Change the brightness level
 821  */
 822 static int set_brightness(int value)
 823 {
 824         acpi_status status = 0;
 825         int ret = 0;
 826
 827         /* SPLV laptop */
 828         if (hotk->methods->brightness_set) {
 829                 if (!write_acpi_int(hotk->handle, hotk->methods->brightness_set,
 830                                     value, NULL))
 831                         printk(KERN_WARNING
 832                                "Asus ACPI: Error changing brightness\n");
 833                         ret = -EIO;
 834                 goto out;
 835         }
 836
 837         /* No SPLV method if we are here, act as appropriate */
 838         value -= read_brightness(NULL);
 839         while (value != 0) {
 840                 status = acpi_evaluate_object(NULL, (value > 0) ?
 841                                               hotk->methods->brightness_up :
 842                                               hotk->methods->brightness_down,
 843                                               NULL, NULL);
 844                 (value > 0) ? value-- : value++;
 845                 if (ACPI_FAILURE(status))
 846                         printk(KERN_WARNING
 847                                "Asus ACPI: Error changing brightness\n");
 848                         ret = -EIO;
 849         }
 850 out:
 851         return ret;
 852 }
 853
 854 static int set_brightness_status(struct backlight_device *bd)
 855 {
 856         return set_brightness(bd->props.brightness);
 857 }
 858
 859 static int
 860 proc_read_brn(char *page, char **start, off_t off, int count, int *eof,
 861               void *data)
 862 {
 863         return sprintf(page, "%d\n", read_brightness(NULL));
 864 }
 865
 866 static int
 867 proc_write_brn(struct file *file, const char __user * buffer,
 868                unsigned long count, void *data)
 869 {
 870         int rv, value;
 871
 872         rv = parse_arg(buffer, count, &value);
 873         if (rv > 0) {
 874                 value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
 875                 /* 0 <= value <= 15 */
 876                 set_brightness(value);
 877         }
 878         return rv;
 879 }
 880
 881 static void set_display(int value)
 882 {
 883         /* no sanity check needed for now */
 884         if (!write_acpi_int(hotk->handle, hotk->methods->display_set,
 885                             value, NULL))
 886                 printk(KERN_WARNING "Asus ACPI: Error setting display\n");
 887         return;
 888 }
 889
 890 /*
 891  * Now, *this* one could be more user-friendly, but so far, no-one has
 892  * complained. The significance of bits is the same as in proc_write_disp()
 893  */
 894 static int
 895 proc_read_disp(char *page, char **start, off_t off, int count, int *eof,
 896                void *data)
 897 {
 898         int value = 0;
 899
 900         if (!read_acpi_int(hotk->handle, hotk->methods->display_get, &value))
 901                 printk(KERN_WARNING
 902                        "Asus ACPI: Error reading display status\n");
 903         value &= 0x07;          /* needed for some models, shouldn't hurt others */
 904         return sprintf(page, "%d\n", value);
 905 }
 906
 907 /*
 908  * Experimental support for display switching. As of now: 1 should activate
 909  * the LCD output, 2 should do for CRT, and 4 for TV-Out. Any combination
 910  * (bitwise) of these will suffice. I never actually tested 3 displays hooked up
 911  * simultaneously, so be warned. See the acpi4asus README for more info.
 912  */
 913 static int
 914 proc_write_disp(struct file *file, const char __user * buffer,
 915                 unsigned long count, void *data)
 916 {
 917         int rv, value;
 918
 919         rv = parse_arg(buffer, count, &value);
 920         if (rv > 0)
 921                 set_display(value);
 922         return rv;
 923 }
 924
 925 typedef int (proc_readfunc) (char *page, char **start, off_t off, int count,
 926                              int *eof, void *data);
 927 typedef int (proc_writefunc) (struct file * file, const char __user * buffer,
 928                               unsigned long count, void *data);
 929
 930 static int
 931 asus_proc_add(char *name, proc_writefunc * writefunc,
 932                      proc_readfunc * readfunc, mode_t mode,
 933                      struct acpi_device *device)
 934 {
 935         struct proc_dir_entry *proc =
 936             create_proc_entry(name, mode, acpi_device_dir(device));
 937         if (!proc) {
 938                 printk(KERN_WARNING "  Unable to create %s fs entry\n", name);
 939                 return -1;
 940         }
 941         proc->write_proc = writefunc;
 942         proc->read_proc = readfunc;
 943         proc->data = acpi_driver_data(device);
 944         proc->owner = THIS_MODULE;
 945         proc->uid = asus_uid;
 946         proc->gid = asus_gid;
 947         return 0;
 948 }
 949
 950 static int asus_hotk_add_fs(struct acpi_device *device)
 951 {
 952         struct proc_dir_entry *proc;
 953         mode_t mode;
 954
 955         /*
 956          * If parameter uid or gid is not changed, keep the default setting for
 957          * our proc entries (-rw-rw-rw-) else, it means we care about security,
 958          * and then set to -rw-rw----
 959          */
 960
 961         if ((asus_uid == 0) && (asus_gid == 0)) {
 962                 mode = S_IFREG | S_IRUGO | S_IWUGO;
 963         } else {
 964                 mode = S_IFREG | S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
 965                 printk(KERN_WARNING "  asus_uid and asus_gid parameters are "
 966                        "deprecated, use chown and chmod instead!\n");
 967         }
 968
 969         acpi_device_dir(device) = asus_proc_dir;
 970         if (!acpi_device_dir(device))
 971                 return -ENODEV;
 972
 973         proc = create_proc_entry(PROC_INFO, mode, acpi_device_dir(device));
 974         if (proc) {
 975                 proc->read_proc = proc_read_info;
 976                 proc->data = acpi_driver_data(device);
 977                 proc->owner = THIS_MODULE;
 978                 proc->uid = asus_uid;
 979                 proc->gid = asus_gid;
 980         } else {
 981                 printk(KERN_WARNING "  Unable to create " PROC_INFO
 982                        " fs entry\n");
 983         }
 984
 985         if (hotk->methods->mt_wled) {
 986                 asus_proc_add(PROC_WLED, &proc_write_wled, &proc_read_wled,
 987                               mode, device);
 988         }
 989
 990         if (hotk->methods->mt_ledd) {
 991                 asus_proc_add(PROC_LEDD, &proc_write_ledd, &proc_read_ledd,
 992                               mode, device);
 993         }
 994
 995         if (hotk->methods->mt_mled) {
 996                 asus_proc_add(PROC_MLED, &proc_write_mled, &proc_read_mled,
 997                               mode, device);
 998         }
 999
1000         if (hotk->methods->mt_tled) {
1001                 asus_proc_add(PROC_TLED, &proc_write_tled, &proc_read_tled,
1002                               mode, device);
1003         }
1004
1005         if (hotk->methods->mt_bt_switch) {
1006                 asus_proc_add(PROC_BT, &proc_write_bluetooth,
1007                               &proc_read_bluetooth, mode, device);
1008         }
1009
1010         /*
1011          * We need both read node and write method as LCD switch is also accessible
1012          * from keyboard
1013          */
1014         if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status) {
1015                 asus_proc_add(PROC_LCD, &proc_write_lcd, &proc_read_lcd, mode,
1016                               device);
1017         }
1018
1019         if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
1020             (hotk->methods->brightness_get && hotk->methods->brightness_set)) {
1021                 asus_proc_add(PROC_BRN, &proc_write_brn, &proc_read_brn, mode,
1022                               device);
1023         }
1024
1025         if (hotk->methods->display_set) {
1026                 asus_proc_add(PROC_DISP, &proc_write_disp, &proc_read_disp,
1027                               mode, device);
1028         }
1029
1030         return 0;
1031 }
1032
1033 static int asus_hotk_remove_fs(struct acpi_device *device)
1034 {
1035         if (acpi_device_dir(device)) {
1036                 remove_proc_entry(PROC_INFO, acpi_device_dir(device));
1037                 if (hotk->methods->mt_wled)
1038                         remove_proc_entry(PROC_WLED, acpi_device_dir(device));
1039                 if (hotk->methods->mt_mled)
1040                         remove_proc_entry(PROC_MLED, acpi_device_dir(device));
1041                 if (hotk->methods->mt_tled)
1042                         remove_proc_entry(PROC_TLED, acpi_device_dir(device));
1043                 if (hotk->methods->mt_ledd)
1044                         remove_proc_entry(PROC_LEDD, acpi_device_dir(device));
1045                 if (hotk->methods->mt_bt_switch)
1046                         remove_proc_entry(PROC_BT, acpi_device_dir(device));
1047                 if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status)
1048                         remove_proc_entry(PROC_LCD, acpi_device_dir(device));
1049                 if ((hotk->methods->brightness_up
1050                      && hotk->methods->brightness_down)
1051                     || (hotk->methods->brightness_get
1052                         && hotk->methods->brightness_set))
1053                         remove_proc_entry(PROC_BRN, acpi_device_dir(device));
1054                 if (hotk->methods->display_set)
1055                         remove_proc_entry(PROC_DISP, acpi_device_dir(device));
1056         }
1057         return 0;
1058 }
1059
1060 static void asus_hotk_notify(acpi_handle handle, u32 event, void *data)
1061 {
1062         /* TODO Find a better way to handle events count. */
1063         if (!hotk)
1064                 return;
1065
1066         if ((event & ~((u32) BR_UP)) < 16) {
1067                 hotk->brightness = (event & ~((u32) BR_UP));
1068         } else if ((event & ~((u32) BR_DOWN)) < 16) {
1069                 hotk->brightness = (event & ~((u32) BR_DOWN));
1070         }
1071
1072         acpi_bus_generate_event(hotk->device, event,
1073                                 hotk->event_count[event % 128]++);
1074
1075         return;
1076 }
1077
1078 /*
1079  * Match the model string to the list of supported models. Return END_MODEL if
1080  * no match or model is NULL.
1081  */
1082 static int asus_model_match(char *model)
1083 {
1084         if (model == NULL)
1085                 return END_MODEL;
1086
1087         if (strncmp(model, "L3D", 3) == 0)
1088                 return L3D;
1089         else if (strncmp(model, "L2E", 3) == 0 ||
1090                  strncmp(model, "L3H", 3) == 0 || strncmp(model, "L5D", 3) == 0)
1091                 return L3H;
1092         else if (strncmp(model, "L3", 2) == 0 || strncmp(model, "L2B", 3) == 0)
1093                 return L3C;
1094         else if (strncmp(model, "L8L", 3) == 0)
1095                 return L8L;
1096         else if (strncmp(model, "L4R", 3) == 0)
1097                 return L4R;
1098         else if (strncmp(model, "M6N", 3) == 0 || strncmp(model, "W3N", 3) == 0)
1099                 return M6N;
1100         else if (strncmp(model, "M6R", 3) == 0 || strncmp(model, "A3G", 3) == 0)
1101                 return M6R;
1102         else if (strncmp(model, "M2N", 3) == 0 ||
1103                  strncmp(model, "M3N", 3) == 0 ||
1104                  strncmp(model, "M5N", 3) == 0 ||
1105                  strncmp(model, "M6N", 3) == 0 ||
1106                  strncmp(model, "S1N", 3) == 0 ||
1107                  strncmp(model, "S5N", 3) == 0 || strncmp(model, "W1N", 3) == 0)
1108                 return xxN;
1109         else if (strncmp(model, "M1", 2) == 0)
1110                 return M1A;
1111         else if (strncmp(model, "M2", 2) == 0 || strncmp(model, "L4E", 3) == 0)
1112                 return M2E;
1113         else if (strncmp(model, "L2", 2) == 0)
1114                 return L2D;
1115         else if (strncmp(model, "L8", 2) == 0)
1116                 return S1x;
1117         else if (strncmp(model, "D1", 2) == 0)
1118                 return D1x;
1119         else if (strncmp(model, "A1", 2) == 0)
1120                 return A1x;
1121         else if (strncmp(model, "A2", 2) == 0)
1122                 return A2x;
1123         else if (strncmp(model, "J1", 2) == 0)
1124                 return S2x;
1125         else if (strncmp(model, "L5", 2) == 0)
1126                 return L5x;
1127         else if (strncmp(model, "A4G", 3) == 0)
1128                 return A4G;
1129         else if (strncmp(model, "W1N", 3) == 0)
1130                 return W1N;
1131         else if (strncmp(model, "W3V", 3) == 0)
1132                 return W3V;
1133         else if (strncmp(model, "W5A", 3) == 0)
1134                 return W5A;
1135         else if (strncmp(model, "A4S", 3) == 0)
1136                 return A4S;
1137         else
1138                 return END_MODEL;
1139 }
1140
1141 /*
1142  * This function is used to initialize the hotk with right values. In this
1143  * method, we can make all the detection we want, and modify the hotk struct
1144  */
1145 static int asus_hotk_get_info(void)
1146 {
1147         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1148         union acpi_object *model = NULL;
1149         int bsts_result;
1150         char *string = NULL;
1151         acpi_status status;
1152
1153         /*
1154          * Get DSDT headers early enough to allow for differentiating between
1155          * models, but late enough to allow acpi_bus_register_driver() to fail
1156          * before doing anything ACPI-specific. Should we encounter a machine,
1157          * which needs special handling (i.e. its hotkey device has a different
1158          * HID), this bit will be moved. A global variable asus_info contains
1159          * the DSDT header.
1160          */
1161         status = acpi_get_table(ACPI_SIG_DSDT, 1, &asus_info);
1162         if (ACPI_FAILURE(status))
1163                 printk(KERN_WARNING "  Couldn't get the DSDT table header\n");
1164
1165         /* We have to write 0 on init this far for all ASUS models */
1166         if (!write_acpi_int(hotk->handle, "INIT", 0, &buffer)) {
1167                 printk(KERN_ERR "  Hotkey initialization failed\n");
1168                 return -ENODEV;
1169         }
1170
1171         /* This needs to be called for some laptops to init properly */
1172         if (!read_acpi_int(hotk->handle, "BSTS", &bsts_result))
1173                 printk(KERN_WARNING "  Error calling BSTS\n");
1174         else if (bsts_result)
1175                 printk(KERN_NOTICE "  BSTS called, 0x%02x returned\n",
1176                        bsts_result);
1177
1178         /*
1179          * Try to match the object returned by INIT to the specific model.
1180          * Handle every possible object (or the lack of thereof) the DSDT
1181          * writers might throw at us. When in trouble, we pass NULL to
1182          * asus_model_match() and try something completely different.
1183          */
1184         if (buffer.pointer) {
1185                 model = buffer.pointer;
1186                 switch (model->type) {
1187                 case ACPI_TYPE_STRING:
1188                         string = model->string.pointer;
1189                         break;
1190                 case ACPI_TYPE_BUFFER:
1191                         string = model->buffer.pointer;
1192                         break;
1193                 default:
1194                         kfree(model);
1195                         break;
1196                 }
1197         }
1198         hotk->model = asus_model_match(string);
1199         if (hotk->model == END_MODEL) { /* match failed */
1200                 if (asus_info &&
1201                     strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) {
1202                         hotk->model = P30;
1203                         printk(KERN_NOTICE
1204                                "  Samsung P30 detected, supported\n");
1205                 } else {
1206                         hotk->model = M2E;
1207                         printk(KERN_NOTICE "  unsupported model %s, trying "
1208                                "default values\n", string);
1209                         printk(KERN_NOTICE
1210                                "  send /proc/acpi/dsdt to the developers\n");
1211                 }
1212                 hotk->methods = &model_conf[hotk->model];
1213                 return AE_OK;
1214         }
1215         hotk->methods = &model_conf[hotk->model];
1216         printk(KERN_NOTICE "  %s model detected, supported\n", string);
1217
1218         /* Sort of per-model blacklist */
1219         if (strncmp(string, "L2B", 3) == 0)
1220                 hotk->methods->lcd_status = NULL;
1221         /* L2B is similar enough to L3C to use its settings, with this only
1222            exception */
1223         else if (strncmp(string, "A3G", 3) == 0)
1224                 hotk->methods->lcd_status = "\\BLFG";
1225         /* A3G is like M6R */
1226         else if (strncmp(string, "S5N", 3) == 0 ||
1227                  strncmp(string, "M5N", 3) == 0 ||
1228                  strncmp(string, "W3N", 3) == 0)
1229                 hotk->methods->mt_mled = NULL;
1230         /* S5N, M5N and W3N have no MLED */
1231         else if (strncmp(string, "L5D", 3) == 0)
1232                 hotk->methods->mt_wled = NULL;
1233         /* L5D's WLED is not controlled by ACPI */
1234         else if (strncmp(string, "M2N", 3) == 0 ||
1235                  strncmp(string, "W3V", 3) == 0 ||
1236                  strncmp(string, "S1N", 3) == 0)
1237                 hotk->methods->mt_wled = "WLED";
1238         /* M2N, S1N and W3V have a usable WLED */
1239         else if (asus_info) {
1240                 if (strncmp(asus_info->oem_table_id, "L1", 2) == 0)
1241                         hotk->methods->mled_status = NULL;
1242                 /* S1300A reports L84F, but L1400B too, account for that */
1243         }
1244
1245         kfree(model);
1246
1247         return AE_OK;
1248 }
1249
1250 static int asus_hotk_check(void)
1251 {
1252         int result = 0;
1253
1254         result = acpi_bus_get_status(hotk->device);
1255         if (result)
1256                 return result;
1257
1258         if (hotk->device->status.present) {
1259                 result = asus_hotk_get_info();
1260         } else {
1261                 printk(KERN_ERR "  Hotkey device not present, aborting\n");
1262                 return -EINVAL;
1263         }
1264
1265         return result;
1266 }
1267
1268 static int asus_hotk_found;
1269
1270 static int asus_hotk_add(struct acpi_device *device)
1271 {
1272         acpi_status status = AE_OK;
1273         int result;
1274
1275         if (!device)
1276                 return -EINVAL;
1277
1278         printk(KERN_NOTICE "Asus Laptop ACPI Extras version %s\n",
1279                ASUS_ACPI_VERSION);
1280
1281         hotk = kzalloc(sizeof(struct asus_hotk), GFP_KERNEL);
1282         if (!hotk)
1283                 return -ENOMEM;
1284
1285         hotk->handle = device->handle;
1286         strcpy(acpi_device_name(device), ACPI_HOTK_DEVICE_NAME);
1287         strcpy(acpi_device_class(device), ACPI_HOTK_CLASS);
1288         acpi_driver_data(device) = hotk;
1289         hotk->device = device;
1290
1291         result = asus_hotk_check();
1292         if (result)
1293                 goto end;
1294
1295         result = asus_hotk_add_fs(device);
1296         if (result)
1297                 goto end;
1298
1299         /*
1300          * We install the handler, it will receive the hotk in parameter, so, we
1301          * could add other data to the hotk struct
1302          */
1303         status = acpi_install_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1304                                              asus_hotk_notify, hotk);
1305         if (ACPI_FAILURE(status))
1306                 printk(KERN_ERR "  Error installing notify handler\n");
1307
1308         /* For laptops without GPLV: init the hotk->brightness value */
1309         if ((!hotk->methods->brightness_get)
1310             && (!hotk->methods->brightness_status)
1311             && (hotk->methods->brightness_up && hotk->methods->brightness_down)) {
1312                 status =
1313                     acpi_evaluate_object(NULL, hotk->methods->brightness_down,
1314                                          NULL, NULL);
1315                 if (ACPI_FAILURE(status))
1316                         printk(KERN_WARNING "  Error changing brightness\n");
1317                 else {
1318                         status =
1319                             acpi_evaluate_object(NULL,
1320                                                  hotk->methods->brightness_up,
1321                                                  NULL, NULL);
1322                         if (ACPI_FAILURE(status))
1323                                 printk(KERN_WARNING "  Strange, error changing"
1324                                        " brightness\n");
1325                 }
1326         }
1327
1328         asus_hotk_found = 1;
1329
1330         /* LED display is off by default */
1331         hotk->ledd_status = 0xFFF;
1332
1333       end:
1334         if (result) {
1335                 kfree(hotk);
1336         }
1337
1338         return result;
1339 }
1340
1341 static int asus_hotk_remove(struct acpi_device *device, int type)
1342 {
1343         acpi_status status = 0;
1344
1345         if (!device || !acpi_driver_data(device))
1346                 return -EINVAL;
1347
1348         status = acpi_remove_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1349                                             asus_hotk_notify);
1350         if (ACPI_FAILURE(status))
1351                 printk(KERN_ERR "Asus ACPI: Error removing notify handler\n");
1352
1353         asus_hotk_remove_fs(device);
1354
1355         kfree(hotk);
1356
1357         return 0;
1358 }
1359
1360 static struct backlight_ops asus_backlight_data = {
1361         .get_brightness = read_brightness,
1362         .update_status  = set_brightness_status,
1363 };
1364
1365 static void asus_acpi_exit(void)
1366 {
1367         if (asus_backlight_device)
1368                 backlight_device_unregister(asus_backlight_device);
1369
1370         acpi_bus_unregister_driver(&asus_hotk_driver);
1371         remove_proc_entry(PROC_ASUS, acpi_root_dir);
1372
1373         return;
1374 }
1375
1376 static int __init asus_acpi_init(void)
1377 {
1378         int result;
1379
1380         if (acpi_disabled)
1381                 return -ENODEV;
1382
1383         asus_proc_dir = proc_mkdir(PROC_ASUS, acpi_root_dir);
1384         if (!asus_proc_dir) {
1385                 printk(KERN_ERR "Asus ACPI: Unable to create /proc entry\n");
1386                 return -ENODEV;
1387         }
1388         asus_proc_dir->owner = THIS_MODULE;
1389
1390         result = acpi_bus_register_driver(&asus_hotk_driver);
1391         if (result < 0) {
1392                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1393                 return result;
1394         }
1395
1396         /*
1397          * This is a bit of a kludge.  We only want this module loaded
1398          * for ASUS systems, but there's currently no way to probe the
1399          * ACPI namespace for ASUS HIDs.  So we just return failure if
1400          * we didn't find one, which will cause the module to be
1401          * unloaded.
1402          */
1403         if (!asus_hotk_found) {
1404                 acpi_bus_unregister_driver(&asus_hotk_driver);
1405                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1406                 return -ENODEV;
1407         }
1408
1409         asus_backlight_device = backlight_device_register("asus",NULL,NULL,
1410                                                           &asus_backlight_data);
1411         if (IS_ERR(asus_backlight_device)) {
1412                 printk(KERN_ERR "Could not register asus backlight device\n");
1413                 asus_backlight_device = NULL;
1414                 asus_acpi_exit();
1415                 return -ENODEV;
1416         }
1417         asus_backlight_device->props.max_brightness = 15;
1418
1419         return 0;
1420 }
1421
1422 module_init(asus_acpi_init);
1423 module_exit(asus_acpi_exit);