drivers/acpi/asus_acpi.c

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