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