drivers/acpi/asus_acpi.c

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