drivers/acpi/asus_acpi.c

   1 /*
   2  *  asus_acpi.c - Asus Laptop ACPI Extras
   3  *
   4  *
   5  *  Copyright (C) 2002-2005 Julien Lerouge, 2003-2006 Karol Kozimor
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *
  22  *  The development page for this driver is located at
  23  *  http://sourceforge.net/projects/acpi4asus/
  24  *
  25  *  Credits:
  26  *  Pontus Fuchs   - Helper functions, cleanup
  27  *  Johann Wiesner - Small compile fixes
  28  *  John Belmonte  - ACPI code for Toshiba laptop was a good starting point.
  29  *  �ic Burghard  - LED display support for W1N
  30  *
  31  */
  32
  33 #include <linux/kernel.h>
  34 #include <linux/module.h>
  35 #include <linux/init.h>
  36 #include <linux/types.h>
  37 #include <linux/proc_fs.h>
  38 #include <linux/backlight.h>
  39 #include <acpi/acpi_drivers.h>
  40 #include <acpi/acpi_bus.h>
  41 #include <asm/uaccess.h>
  42
  43 #define ASUS_ACPI_VERSION "0.30"
  44
  45 #define PROC_ASUS       "asus"  //the directory
  46 #define PROC_MLED       "mled"
  47 #define PROC_WLED       "wled"
  48 #define PROC_TLED       "tled"
  49 #define PROC_BT         "bluetooth"
  50 #define PROC_LEDD       "ledd"
  51 #define PROC_INFO       "info"
  52 #define PROC_LCD        "lcd"
  53 #define PROC_BRN        "brn"
  54 #define PROC_DISP       "disp"
  55
  56 #define ACPI_HOTK_NAME          "Asus Laptop ACPI Extras Driver"
  57 #define ACPI_HOTK_CLASS         "hotkey"
  58 #define ACPI_HOTK_DEVICE_NAME   "Hotkey"
  59 #define ACPI_HOTK_HID           "ATK0100"
  60
  61 /*
  62  * Some events we use, same for all Asus
  63  */
  64 #define BR_UP       0x10
  65 #define BR_DOWN     0x20
  66
  67 /*
  68  * Flags for hotk status
  69  */
  70 #define MLED_ON     0x01        //mail LED
  71 #define WLED_ON     0x02        //wireless LED
  72 #define TLED_ON     0x04        //touchpad LED
  73 #define BT_ON       0x08        //internal Bluetooth
  74
  75 MODULE_AUTHOR("Julien Lerouge, Karol Kozimor");
  76 MODULE_DESCRIPTION(ACPI_HOTK_NAME);
  77 MODULE_LICENSE("GPL");
  78
  79 static uid_t asus_uid;
  80 static gid_t asus_gid;
  81 module_param(asus_uid, uint, 0);
  82 MODULE_PARM_DESC(asus_uid, "UID for entries in /proc/acpi/asus.\n");
  83 module_param(asus_gid, uint, 0);
  84 MODULE_PARM_DESC(asus_gid, "GID for entries in /proc/acpi/asus.\n");
  85
  86 /* For each model, all features implemented,
  87  * those marked with R are relative to HOTK, A for absolute */
  88 struct model_data {
  89         char *name;             //name of the laptop________________A
  90         char *mt_mled;          //method to handle mled_____________R
  91         char *mled_status;      //node to handle mled reading_______A
  92         char *mt_wled;          //method to handle wled_____________R
  93         char *wled_status;      //node to handle wled reading_______A
  94         char *mt_tled;          //method to handle tled_____________R
  95         char *tled_status;      //node to handle tled reading_______A
  96         char *mt_ledd;          //method to handle LED display______R
  97         char *mt_bt_switch;     //method to switch Bluetooth on/off_R
  98         char *bt_status;        //no model currently supports this__?
  99         char *mt_lcd_switch;    //method to turn LCD on/off_________A
 100         char *lcd_status;       //node to read LCD panel state______A
 101         char *brightness_up;    //method to set brightness up_______A
 102         char *brightness_down;  //guess what ?______________________A
 103         char *brightness_set;   //method to set absolute brightness_R
 104         char *brightness_get;   //method to get absolute brightness_R
 105         char *brightness_status;        //node to get brightness____________A
 106         char *display_set;      //method to set video output________R
 107         char *display_get;      //method to get video output________R
 108 };
 109
 110 /*
 111  * This is the main structure, we can use it to store anything interesting
 112  * about the hotk device
 113  */
 114 struct asus_hotk {
 115         struct acpi_device *device;     //the device we are in
 116         acpi_handle handle;     //the handle of the hotk device
 117         char status;            //status of the hotk, for LEDs, ...
 118         u32 ledd_status;        //status of the LED display
 119         struct model_data *methods;     //methods available on the laptop
 120         u8 brightness;          //brightness level
 121         enum {
 122                 A1x = 0,        //A1340D, A1300F
 123                 A2x,            //A2500H
 124                 A4G,            //A4700G
 125                 D1x,            //D1
 126                 L2D,            //L2000D
 127                 L3C,            //L3800C
 128                 L3D,            //L3400D
 129                 L3H,            //L3H, L2000E, L5D
 130                 L4R,            //L4500R
 131                 L5x,            //L5800C
 132                 L8L,            //L8400L
 133                 M1A,            //M1300A
 134                 M2E,            //M2400E, L4400L
 135                 M6N,            //M6800N, W3400N
 136                 M6R,            //M6700R, A3000G
 137                 P30,            //Samsung P30
 138                 S1x,            //S1300A, but also L1400B and M2400A (L84F)
 139                 S2x,            //S200 (J1 reported), Victor MP-XP7210
 140                 W1N,            //W1000N
 141                 W5A,            //W5A
 142                 W3V,            //W3030V
 143                 xxN,            //M2400N, M3700N, M5200N, M6800N, S1300N, S5200N
 144                 //(Centrino)
 145                 END_MODEL
 146         } model;                //Models currently supported
 147         u16 event_count[128];   //count for each event TODO make this better
 148 };
 149
 150 /* Here we go */
 151 #define A1x_PREFIX "\\_SB.PCI0.ISA.EC0."
 152 #define L3C_PREFIX "\\_SB.PCI0.PX40.ECD0."
 153 #define M1A_PREFIX "\\_SB.PCI0.PX40.EC0."
 154 #define P30_PREFIX "\\_SB.PCI0.LPCB.EC0."
 155 #define S1x_PREFIX "\\_SB.PCI0.PX40."
 156 #define S2x_PREFIX A1x_PREFIX
 157 #define xxN_PREFIX "\\_SB.PCI0.SBRG.EC0."
 158
 159 static struct model_data model_conf[END_MODEL] = {
 160         /*
 161          * TODO I have seen a SWBX and AIBX method on some models, like L1400B,
 162          * it seems to be a kind of switch, but what for ?
 163          */
 164
 165         {
 166          .name = "A1x",
 167          .mt_mled = "MLED",
 168          .mled_status = "\\MAIL",
 169          .mt_lcd_switch = A1x_PREFIX "_Q10",
 170          .lcd_status = "\\BKLI",
 171          .brightness_up = A1x_PREFIX "_Q0E",
 172          .brightness_down = A1x_PREFIX "_Q0F"},
 173
 174         {
 175          .name = "A2x",
 176          .mt_mled = "MLED",
 177          .mt_wled = "WLED",
 178          .wled_status = "\\SG66",
 179          .mt_lcd_switch = "\\Q10",
 180          .lcd_status = "\\BAOF",
 181          .brightness_set = "SPLV",
 182          .brightness_get = "GPLV",
 183          .display_set = "SDSP",
 184          .display_get = "\\INFB"},
 185
 186         {
 187          .name = "A4G",
 188          .mt_mled = "MLED",
 189 /* WLED present, but not controlled by ACPI */
 190          .mt_lcd_switch = xxN_PREFIX "_Q10",
 191          .brightness_set = "SPLV",
 192          .brightness_get = "GPLV",
 193          .display_set = "SDSP",
 194          .display_get = "\\ADVG"},
 195
 196         {
 197          .name = "D1x",
 198          .mt_mled = "MLED",
 199          .mt_lcd_switch = "\\Q0D",
 200          .lcd_status = "\\GP11",
 201          .brightness_up = "\\Q0C",
 202          .brightness_down = "\\Q0B",
 203          .brightness_status = "\\BLVL",
 204          .display_set = "SDSP",
 205          .display_get = "\\INFB"},
 206
 207         {
 208          .name = "L2D",
 209          .mt_mled = "MLED",
 210          .mled_status = "\\SGP6",
 211          .mt_wled = "WLED",
 212          .wled_status = "\\RCP3",
 213          .mt_lcd_switch = "\\Q10",
 214          .lcd_status = "\\SGP0",
 215          .brightness_up = "\\Q0E",
 216          .brightness_down = "\\Q0F",
 217          .display_set = "SDSP",
 218          .display_get = "\\INFB"},
 219
 220         {
 221          .name = "L3C",
 222          .mt_mled = "MLED",
 223          .mt_wled = "WLED",
 224          .mt_lcd_switch = L3C_PREFIX "_Q10",
 225          .lcd_status = "\\GL32",
 226          .brightness_set = "SPLV",
 227          .brightness_get = "GPLV",
 228          .display_set = "SDSP",
 229          .display_get = "\\_SB.PCI0.PCI1.VGAC.NMAP"},
 230
 231         {
 232          .name = "L3D",
 233          .mt_mled = "MLED",
 234          .mled_status = "\\MALD",
 235          .mt_wled = "WLED",
 236          .mt_lcd_switch = "\\Q10",
 237          .lcd_status = "\\BKLG",
 238          .brightness_set = "SPLV",
 239          .brightness_get = "GPLV",
 240          .display_set = "SDSP",
 241          .display_get = "\\INFB"},
 242
 243         {
 244          .name = "L3H",
 245          .mt_mled = "MLED",
 246          .mt_wled = "WLED",
 247          .mt_lcd_switch = "EHK",
 248          .lcd_status = "\\_SB.PCI0.PM.PBC",
 249          .brightness_set = "SPLV",
 250          .brightness_get = "GPLV",
 251          .display_set = "SDSP",
 252          .display_get = "\\INFB"},
 253
 254         {
 255          .name = "L4R",
 256          .mt_mled = "MLED",
 257          .mt_wled = "WLED",
 258          .wled_status = "\\_SB.PCI0.SBRG.SG13",
 259          .mt_lcd_switch = xxN_PREFIX "_Q10",
 260          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
 261          .brightness_set = "SPLV",
 262          .brightness_get = "GPLV",
 263          .display_set = "SDSP",
 264          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
 265
 266         {
 267          .name = "L5x",
 268          .mt_mled = "MLED",
 269 /* WLED present, but not controlled by ACPI */
 270          .mt_tled = "TLED",
 271          .mt_lcd_switch = "\\Q0D",
 272          .lcd_status = "\\BAOF",
 273          .brightness_set = "SPLV",
 274          .brightness_get = "GPLV",
 275          .display_set = "SDSP",
 276          .display_get = "\\INFB"},
 277
 278         {
 279          .name = "L8L"
 280 /* No features, but at least support the hotkeys */
 281          },
 282
 283         {
 284          .name = "M1A",
 285          .mt_mled = "MLED",
 286          .mt_lcd_switch = M1A_PREFIX "Q10",
 287          .lcd_status = "\\PNOF",
 288          .brightness_up = M1A_PREFIX "Q0E",
 289          .brightness_down = M1A_PREFIX "Q0F",
 290          .brightness_status = "\\BRIT",
 291          .display_set = "SDSP",
 292          .display_get = "\\INFB"},
 293
 294         {
 295          .name = "M2E",
 296          .mt_mled = "MLED",
 297          .mt_wled = "WLED",
 298          .mt_lcd_switch = "\\Q10",
 299          .lcd_status = "\\GP06",
 300          .brightness_set = "SPLV",
 301          .brightness_get = "GPLV",
 302          .display_set = "SDSP",
 303          .display_get = "\\INFB"},
 304
 305         {
 306          .name = "M6N",
 307          .mt_mled = "MLED",
 308          .mt_wled = "WLED",
 309          .wled_status = "\\_SB.PCI0.SBRG.SG13",
 310          .mt_lcd_switch = xxN_PREFIX "_Q10",
 311          .lcd_status = "\\_SB.BKLT",
 312          .brightness_set = "SPLV",
 313          .brightness_get = "GPLV",
 314          .display_set = "SDSP",
 315          .display_get = "\\SSTE"},
 316
 317         {
 318          .name = "M6R",
 319          .mt_mled = "MLED",
 320          .mt_wled = "WLED",
 321          .mt_lcd_switch = xxN_PREFIX "_Q10",
 322          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
 323          .brightness_set = "SPLV",
 324          .brightness_get = "GPLV",
 325          .display_set = "SDSP",
 326          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
 327
 328         {
 329          .name = "P30",
 330          .mt_wled = "WLED",
 331          .mt_lcd_switch = P30_PREFIX "_Q0E",
 332          .lcd_status = "\\BKLT",
 333          .brightness_up = P30_PREFIX "_Q68",
 334          .brightness_down = P30_PREFIX "_Q69",
 335          .brightness_get = "GPLV",
 336          .display_set = "SDSP",
 337          .display_get = "\\DNXT"},
 338
 339         {
 340          .name = "S1x",
 341          .mt_mled = "MLED",
 342          .mled_status = "\\EMLE",
 343          .mt_wled = "WLED",
 344          .mt_lcd_switch = S1x_PREFIX "Q10",
 345          .lcd_status = "\\PNOF",
 346          .brightness_set = "SPLV",
 347          .brightness_get = "GPLV"},
 348
 349         {
 350          .name = "S2x",
 351          .mt_mled = "MLED",
 352          .mled_status = "\\MAIL",
 353          .mt_lcd_switch = S2x_PREFIX "_Q10",
 354          .lcd_status = "\\BKLI",
 355          .brightness_up = S2x_PREFIX "_Q0B",
 356          .brightness_down = S2x_PREFIX "_Q0A"},
 357
 358         {
 359          .name = "W1N",
 360          .mt_mled = "MLED",
 361          .mt_wled = "WLED",
 362          .mt_ledd = "SLCM",
 363          .mt_lcd_switch = xxN_PREFIX "_Q10",
 364          .lcd_status = "\\BKLT",
 365          .brightness_set = "SPLV",
 366          .brightness_get = "GPLV",
 367          .display_set = "SDSP",
 368          .display_get = "\\ADVG"},
 369
 370         {
 371          .name = "W5A",
 372          .mt_bt_switch = "BLED",
 373          .mt_wled = "WLED",
 374          .mt_lcd_switch = xxN_PREFIX "_Q10",
 375          .brightness_set = "SPLV",
 376          .brightness_get = "GPLV",
 377          .display_set = "SDSP",
 378          .display_get = "\\ADVG"},
 379
 380         {
 381          .name = "W3V",
 382          .mt_mled = "MLED",
 383          .mt_wled = "WLED",
 384          .mt_lcd_switch = xxN_PREFIX "_Q10",
 385          .lcd_status = "\\BKLT",
 386          .brightness_set = "SPLV",
 387          .brightness_get = "GPLV",
 388          .display_set = "SDSP",
 389          .display_get = "\\INFB"},
 390
 391        {
 392          .name = "xxN",
 393          .mt_mled = "MLED",
 394 /* WLED present, but not controlled by ACPI */
 395          .mt_lcd_switch = xxN_PREFIX "_Q10",
 396          .lcd_status = "\\BKLT",
 397          .brightness_set = "SPLV",
 398          .brightness_get = "GPLV",
 399          .display_set = "SDSP",
 400          .display_get = "\\ADVG"}
 401 };
 402
 403 /* procdir we use */
 404 static struct proc_dir_entry *asus_proc_dir;
 405
 406 static struct backlight_device *asus_backlight_device;
 407
 408 /*
 409  * This header is made available to allow proper configuration given model,
 410  * revision number , ... this info cannot go in struct asus_hotk because it is
 411  * available before the hotk
 412  */
 413 static struct acpi_table_header *asus_info;
 414
 415 /* The actual device the driver binds to */
 416 static struct asus_hotk *hotk;
 417
 418 /*
 419  * The hotkey driver declaration
 420  */
 421 static int asus_hotk_add(struct acpi_device *device);
 422 static int asus_hotk_remove(struct acpi_device *device, int type);
 423 static struct acpi_driver asus_hotk_driver = {
 424         .name = ACPI_HOTK_NAME,
 425         .class = ACPI_HOTK_CLASS,
 426         .ids = ACPI_HOTK_HID,
 427         .ops = {
 428                 .add = asus_hotk_add,
 429                 .remove = asus_hotk_remove,
 430                 },
 431 };
 432
 433 /*
 434  * This function evaluates an ACPI method, given an int as parameter, the
 435  * method is searched within the scope of the handle, can be NULL. The output
 436  * of the method is written is output, which can also be NULL
 437  *
 438  * returns 1 if write is successful, 0 else.
 439  */
 440 static int write_acpi_int(acpi_handle handle, const char *method, int val,
 441                           struct acpi_buffer *output)
 442 {
 443         struct acpi_object_list params; //list of input parameters (an int here)
 444         union acpi_object in_obj;       //the only param we use
 445         acpi_status status;
 446
 447         params.count = 1;
 448         params.pointer = &in_obj;
 449         in_obj.type = ACPI_TYPE_INTEGER;
 450         in_obj.integer.value = val;
 451
 452         status = acpi_evaluate_object(handle, (char *)method, &params, output);
 453         return (status == AE_OK);
 454 }
 455
 456 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
 457 {
 458         struct acpi_buffer output;
 459         union acpi_object out_obj;
 460         acpi_status status;
 461
 462         output.length = sizeof(out_obj);
 463         output.pointer = &out_obj;
 464
 465         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
 466         *val = out_obj.integer.value;
 467         return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
 468 }
 469
 470 /*
 471  * We write our info in page, we begin at offset off and cannot write more
 472  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 473  * number of bytes written in page
 474  */
 475 static int
 476 proc_read_info(char *page, char **start, off_t off, int count, int *eof,
 477                void *data)
 478 {
 479         int len = 0;
 480         int temp;
 481         char buf[16];           //enough for all info
 482         /*
 483          * We use the easy way, we don't care of off and count, so we don't set eof
 484          * to 1
 485          */
 486
 487         len += sprintf(page, ACPI_HOTK_NAME " " ASUS_ACPI_VERSION "\n");
 488         len += sprintf(page + len, "Model reference    : %s\n",
 489                        hotk->methods->name);
 490         /*
 491          * The SFUN method probably allows the original driver to get the list
 492          * of features supported by a given model. For now, 0x0100 or 0x0800
 493          * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
 494          * The significance of others is yet to be found.
 495          */
 496         if (read_acpi_int(hotk->handle, "SFUN", &temp))
 497                 len +=
 498                     sprintf(page + len, "SFUN value         : 0x%04x\n", temp);
 499         /*
 500          * Another value for userspace: the ASYM method returns 0x02 for
 501          * battery low and 0x04 for battery critical, its readings tend to be
 502          * more accurate than those provided by _BST.
 503          * Note: since not all the laptops provide this method, errors are
 504          * silently ignored.
 505          */
 506         if (read_acpi_int(hotk->handle, "ASYM", &temp))
 507                 len +=
 508                     sprintf(page + len, "ASYM value         : 0x%04x\n", temp);
 509         if (asus_info) {
 510                 snprintf(buf, 16, "%d", asus_info->length);
 511                 len += sprintf(page + len, "DSDT length        : %s\n", buf);
 512                 snprintf(buf, 16, "%d", asus_info->checksum);
 513                 len += sprintf(page + len, "DSDT checksum      : %s\n", buf);
 514                 snprintf(buf, 16, "%d", asus_info->revision);
 515                 len += sprintf(page + len, "DSDT revision      : %s\n", buf);
 516                 snprintf(buf, 7, "%s", asus_info->oem_id);
 517                 len += sprintf(page + len, "OEM id             : %s\n", buf);
 518                 snprintf(buf, 9, "%s", asus_info->oem_table_id);
 519                 len += sprintf(page + len, "OEM table id       : %s\n", buf);
 520                 snprintf(buf, 16, "%x", asus_info->oem_revision);
 521                 len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);
 522                 snprintf(buf, 5, "%s", asus_info->asl_compiler_id);
 523                 len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
 524                 snprintf(buf, 16, "%x", asus_info->asl_compiler_revision);
 525                 len += sprintf(page + len, "ASL comp revision  : 0x%s\n", buf);
 526         }
 527
 528         return len;
 529 }
 530
 531 /*
 532  * /proc handlers
 533  * We write our info in page, we begin at offset off and cannot write more
 534  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 535  * number of bytes written in page
 536  */
 537
 538 /* Generic LED functions */
 539 static int read_led(const char *ledname, int ledmask)
 540 {
 541         if (ledname) {
 542                 int led_status;
 543
 544                 if (read_acpi_int(NULL, ledname, &led_status))
 545                         return led_status;
 546                 else
 547                         printk(KERN_WARNING "Asus ACPI: Error reading LED "
 548                                "status\n");
 549         }
 550         return (hotk->status & ledmask) ? 1 : 0;
 551 }
 552
 553 static int parse_arg(const char __user * buf, unsigned long count, int *val)
 554 {
 555         char s[32];
 556         if (!count)
 557                 return 0;
 558         if (count > 31)
 559                 return -EINVAL;
 560         if (copy_from_user(s, buf, count))
 561                 return -EFAULT;
 562         s[count] = 0;
 563         if (sscanf(s, "%i", val) != 1)
 564                 return -EINVAL;
 565         return count;
 566 }
 567
 568 /* FIXME: kill extraneous args so it can be called independently */
 569 static int
 570 write_led(const char __user * buffer, unsigned long count,
 571           char *ledname, int ledmask, int invert)
 572 {
 573         int rv, value;
 574         int led_out = 0;
 575
 576         rv = parse_arg(buffer, count, &value);
 577         if (rv > 0)
 578                 led_out = value ? 1 : 0;
 579
 580         hotk->status =
 581             (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);
 582
 583         if (invert)             /* invert target value */
 584                 led_out = !led_out & 0x1;
 585
 586         if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
 587                 printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",
 588                        ledname);
 589
 590         return rv;
 591 }
 592
 593 /*
 594  * Proc handlers for MLED
 595  */
 596 static int
 597 proc_read_mled(char *page, char **start, off_t off, int count, int *eof,
 598                void *data)
 599 {
 600         return sprintf(page, "%d\n",
 601                        read_led(hotk->methods->mled_status, MLED_ON));
 602 }
 603
 604 static int
 605 proc_write_mled(struct file *file, const char __user * buffer,
 606                 unsigned long count, void *data)
 607 {
 608         return write_led(buffer, count, hotk->methods->mt_mled, MLED_ON, 1);
 609 }
 610
 611 /*
 612  * Proc handlers for LED display
 613  */
 614 static int
 615 proc_read_ledd(char *page, char **start, off_t off, int count, int *eof,
 616                void *data)
 617 {
 618         return sprintf(page, "0x%08x\n", hotk->ledd_status);
 619 }
 620
 621 static int
 622 proc_write_ledd(struct file *file, const char __user * buffer,
 623                 unsigned long count, void *data)
 624 {
 625         int rv, value;
 626
 627         rv = parse_arg(buffer, count, &value);
 628         if (rv > 0) {
 629                 if (!write_acpi_int
 630                     (hotk->handle, hotk->methods->mt_ledd, value, NULL))
 631                         printk(KERN_WARNING
 632                                "Asus ACPI: LED display write failed\n");
 633                 else
 634                         hotk->ledd_status = (u32) value;
 635         }
 636         return rv;
 637 }
 638
 639 /*
 640  * Proc handlers for WLED
 641  */
 642 static int
 643 proc_read_wled(char *page, char **start, off_t off, int count, int *eof,
 644                void *data)
 645 {
 646         return sprintf(page, "%d\n",
 647                        read_led(hotk->methods->wled_status, WLED_ON));
 648 }
 649
 650 static int
 651 proc_write_wled(struct file *file, const char __user * buffer,
 652                 unsigned long count, void *data)
 653 {
 654         return write_led(buffer, count, hotk->methods->mt_wled, WLED_ON, 0);
 655 }
 656
 657 /*
 658  * Proc handlers for Bluetooth
 659  */
 660 static int
 661 proc_read_bluetooth(char *page, char **start, off_t off, int count, int *eof,
 662                     void *data)
 663 {
 664         return sprintf(page, "%d\n", read_led(hotk->methods->bt_status, BT_ON));
 665 }
 666
 667 static int
 668 proc_write_bluetooth(struct file *file, const char __user * buffer,
 669                      unsigned long count, void *data)
 670 {
 671         /* Note: mt_bt_switch controls both internal Bluetooth adapter's
 672            presence and its LED */
 673         return write_led(buffer, count, hotk->methods->mt_bt_switch, BT_ON, 0);
 674 }
 675
 676 /*
 677  * Proc handlers for TLED
 678  */
 679 static int
 680 proc_read_tled(char *page, char **start, off_t off, int count, int *eof,
 681                void *data)
 682 {
 683         return sprintf(page, "%d\n",
 684                        read_led(hotk->methods->tled_status, TLED_ON));
 685 }
 686
 687 static int
 688 proc_write_tled(struct file *file, const char __user * buffer,
 689                 unsigned long count, void *data)
 690 {
 691         return write_led(buffer, count, hotk->methods->mt_tled, TLED_ON, 0);
 692 }
 693
 694 static int get_lcd_state(void)
 695 {
 696         int lcd = 0;
 697
 698         if (hotk->model != L3H) {
 699                 /* We don't have to check anything if we are here */
 700                 if (!read_acpi_int(NULL, hotk->methods->lcd_status, &lcd))
 701                         printk(KERN_WARNING
 702                                "Asus ACPI: Error reading LCD status\n");
 703
 704                 if (hotk->model == L2D)
 705                         lcd = ~lcd;
 706         } else {                /* L3H and the like have to be handled differently */
 707                 acpi_status status = 0;
 708                 struct acpi_object_list input;
 709                 union acpi_object mt_params[2];
 710                 struct acpi_buffer output;
 711                 union acpi_object out_obj;
 712
 713                 input.count = 2;
 714                 input.pointer = mt_params;
 715                 /* Note: the following values are partly guessed up, but
 716                    otherwise they seem to work */
 717                 mt_params[0].type = ACPI_TYPE_INTEGER;
 718                 mt_params[0].integer.value = 0x02;
 719                 mt_params[1].type = ACPI_TYPE_INTEGER;
 720                 mt_params[1].integer.value = 0x02;
 721
 722                 output.length = sizeof(out_obj);
 723                 output.pointer = &out_obj;
 724
 725                 status =
 726                     acpi_evaluate_object(NULL, hotk->methods->lcd_status,
 727                                          &input, &output);
 728                 if (status != AE_OK)
 729                         return -1;
 730                 if (out_obj.type == ACPI_TYPE_INTEGER)
 731                         /* That's what the AML code does */
 732                         lcd = out_obj.integer.value >> 8;
 733         }
 734
 735         return (lcd & 1);
 736 }
 737
 738 static int set_lcd_state(int value)
 739 {
 740         int lcd = 0;
 741         acpi_status status = 0;
 742
 743         lcd = value ? 1 : 0;
 744         if (lcd != get_lcd_state()) {
 745                 /* switch */
 746                 if (hotk->model != L3H) {
 747                         status =
 748                             acpi_evaluate_object(NULL,
 749                                                  hotk->methods->mt_lcd_switch,
 750                                                  NULL, NULL);
 751                 } else {        /* L3H and the like have to be handled differently */
 752                         if (!write_acpi_int
 753                             (hotk->handle, hotk->methods->mt_lcd_switch, 0x07,
 754                              NULL))
 755                                 status = AE_ERROR;
 756                         /* L3H's AML executes EHK (0x07) upon Fn+F7 keypress,
 757                            the exact behaviour is simulated here */
 758                 }
 759                 if (ACPI_FAILURE(status))
 760                         printk(KERN_WARNING "Asus ACPI: Error switching LCD\n");
 761         }
 762         return 0;
 763
 764 }
 765
 766 static int
 767 proc_read_lcd(char *page, char **start, off_t off, int count, int *eof,
 768               void *data)
 769 {
 770         return sprintf(page, "%d\n", get_lcd_state());
 771 }
 772
 773 static int
 774 proc_write_lcd(struct file *file, const char __user * buffer,
 775                unsigned long count, void *data)
 776 {
 777         int rv, value;
 778
 779         rv = parse_arg(buffer, count, &value);
 780         if (rv > 0)
 781                 set_lcd_state(value);
 782         return rv;
 783 }
 784
 785 static int read_brightness(struct backlight_device *bd)
 786 {
 787         int value;
 788
 789         if (hotk->methods->brightness_get) {    /* SPLV/GPLV laptop */
 790                 if (!read_acpi_int(hotk->handle, hotk->methods->brightness_get,
 791                                    &value))
 792                         printk(KERN_WARNING
 793                                "Asus ACPI: Error reading brightness\n");
 794         } else if (hotk->methods->brightness_status) {  /* For D1 for example */
 795                 if (!read_acpi_int(NULL, hotk->methods->brightness_status,
 796                                    &value))
 797                         printk(KERN_WARNING
 798                                "Asus ACPI: Error reading brightness\n");
 799         } else                  /* No GPLV method */
 800                 value = hotk->brightness;
 801         return value;
 802 }
 803
 804 /*
 805  * Change the brightness level
 806  */
 807 static int set_brightness(int value)
 808 {
 809         acpi_status status = 0;
 810         int ret = 0;
 811
 812         /* SPLV laptop */
 813         if (hotk->methods->brightness_set) {
 814                 if (!write_acpi_int(hotk->handle, hotk->methods->brightness_set,
 815                                     value, NULL))
 816                         printk(KERN_WARNING
 817                                "Asus ACPI: Error changing brightness\n");
 818                         ret = -EIO;
 819                 goto out;
 820         }
 821
 822         /* No SPLV method if we are here, act as appropriate */
 823         value -= read_brightness(NULL);
 824         while (value != 0) {
 825                 status = acpi_evaluate_object(NULL, (value > 0) ?
 826                                               hotk->methods->brightness_up :
 827                                               hotk->methods->brightness_down,
 828                                               NULL, NULL);
 829                 (value > 0) ? value-- : value++;
 830                 if (ACPI_FAILURE(status))
 831                         printk(KERN_WARNING
 832                                "Asus ACPI: Error changing brightness\n");
 833                         ret = -EIO;
 834         }
 835 out:
 836         return ret;
 837 }
 838
 839 static int set_brightness_status(struct backlight_device *bd)
 840 {
 841         return set_brightness(bd->props->brightness);
 842 }
 843
 844 static int
 845 proc_read_brn(char *page, char **start, off_t off, int count, int *eof,
 846               void *data)
 847 {
 848         return sprintf(page, "%d\n", read_brightness(NULL));
 849 }
 850
 851 static int
 852 proc_write_brn(struct file *file, const char __user * buffer,
 853                unsigned long count, void *data)
 854 {
 855         int rv, value;
 856
 857         rv = parse_arg(buffer, count, &value);
 858         if (rv > 0) {
 859                 value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
 860                 /* 0 <= value <= 15 */
 861                 set_brightness(value);
 862         }
 863         return rv;
 864 }
 865
 866 static void set_display(int value)
 867 {
 868         /* no sanity check needed for now */
 869         if (!write_acpi_int(hotk->handle, hotk->methods->display_set,
 870                             value, NULL))
 871                 printk(KERN_WARNING "Asus ACPI: Error setting display\n");
 872         return;
 873 }
 874
 875 /*
 876  * Now, *this* one could be more user-friendly, but so far, no-one has
 877  * complained. The significance of bits is the same as in proc_write_disp()
 878  */
 879 static int
 880 proc_read_disp(char *page, char **start, off_t off, int count, int *eof,
 881                void *data)
 882 {
 883         int value = 0;
 884
 885         if (!read_acpi_int(hotk->handle, hotk->methods->display_get, &value))
 886                 printk(KERN_WARNING
 887                        "Asus ACPI: Error reading display status\n");
 888         value &= 0x07;          /* needed for some models, shouldn't hurt others */
 889         return sprintf(page, "%d\n", value);
 890 }
 891
 892 /*
 893  * Experimental support for display switching. As of now: 1 should activate
 894  * the LCD output, 2 should do for CRT, and 4 for TV-Out. Any combination
 895  * (bitwise) of these will suffice. I never actually tested 3 displays hooked up
 896  * simultaneously, so be warned. See the acpi4asus README for more info.
 897  */
 898 static int
 899 proc_write_disp(struct file *file, const char __user * buffer,
 900                 unsigned long count, void *data)
 901 {
 902         int rv, value;
 903
 904         rv = parse_arg(buffer, count, &value);
 905         if (rv > 0)
 906                 set_display(value);
 907         return rv;
 908 }
 909
 910 typedef int (proc_readfunc) (char *page, char **start, off_t off, int count,
 911                              int *eof, void *data);
 912 typedef int (proc_writefunc) (struct file * file, const char __user * buffer,
 913                               unsigned long count, void *data);
 914
 915 static int
 916 asus_proc_add(char *name, proc_writefunc * writefunc,
 917                      proc_readfunc * readfunc, mode_t mode,
 918                      struct acpi_device *device)
 919 {
 920         struct proc_dir_entry *proc =
 921             create_proc_entry(name, mode, acpi_device_dir(device));
 922         if (!proc) {
 923                 printk(KERN_WARNING "  Unable to create %s fs entry\n", name);
 924                 return -1;
 925         }
 926         proc->write_proc = writefunc;
 927         proc->read_proc = readfunc;
 928         proc->data = acpi_driver_data(device);
 929         proc->owner = THIS_MODULE;
 930         proc->uid = asus_uid;
 931         proc->gid = asus_gid;
 932         return 0;
 933 }
 934
 935 static int asus_hotk_add_fs(struct acpi_device *device)
 936 {
 937         struct proc_dir_entry *proc;
 938         mode_t mode;
 939
 940         /*
 941          * If parameter uid or gid is not changed, keep the default setting for
 942          * our proc entries (-rw-rw-rw-) else, it means we care about security,
 943          * and then set to -rw-rw----
 944          */
 945
 946         if ((asus_uid == 0) && (asus_gid == 0)) {
 947                 mode = S_IFREG | S_IRUGO | S_IWUGO;
 948         } else {
 949                 mode = S_IFREG | S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
 950                 printk(KERN_WARNING "  asus_uid and asus_gid parameters are "
 951                        "deprecated, use chown and chmod instead!\n");
 952         }
 953
 954         acpi_device_dir(device) = asus_proc_dir;
 955         if (!acpi_device_dir(device))
 956                 return -ENODEV;
 957
 958         proc = create_proc_entry(PROC_INFO, mode, acpi_device_dir(device));
 959         if (proc) {
 960                 proc->read_proc = proc_read_info;
 961                 proc->data = acpi_driver_data(device);
 962                 proc->owner = THIS_MODULE;
 963                 proc->uid = asus_uid;
 964                 proc->gid = asus_gid;
 965         } else {
 966                 printk(KERN_WARNING "  Unable to create " PROC_INFO
 967                        " fs entry\n");
 968         }
 969
 970         if (hotk->methods->mt_wled) {
 971                 asus_proc_add(PROC_WLED, &proc_write_wled, &proc_read_wled,
 972                               mode, device);
 973         }
 974
 975         if (hotk->methods->mt_ledd) {
 976                 asus_proc_add(PROC_LEDD, &proc_write_ledd, &proc_read_ledd,
 977                               mode, device);
 978         }
 979
 980         if (hotk->methods->mt_mled) {
 981                 asus_proc_add(PROC_MLED, &proc_write_mled, &proc_read_mled,
 982                               mode, device);
 983         }
 984
 985         if (hotk->methods->mt_tled) {
 986                 asus_proc_add(PROC_TLED, &proc_write_tled, &proc_read_tled,
 987                               mode, device);
 988         }
 989
 990         if (hotk->methods->mt_bt_switch) {
 991                 asus_proc_add(PROC_BT, &proc_write_bluetooth,
 992                               &proc_read_bluetooth, mode, device);
 993         }
 994
 995         /*
 996          * We need both read node and write method as LCD switch is also accessible
 997          * from keyboard
 998          */
 999         if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status) {
1000                 asus_proc_add(PROC_LCD, &proc_write_lcd, &proc_read_lcd, mode,
1001                               device);
1002         }
1003
1004         if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
1005             (hotk->methods->brightness_get && hotk->methods->brightness_set)) {
1006                 asus_proc_add(PROC_BRN, &proc_write_brn, &proc_read_brn, mode,
1007                               device);
1008         }
1009
1010         if (hotk->methods->display_set) {
1011                 asus_proc_add(PROC_DISP, &proc_write_disp, &proc_read_disp,
1012                               mode, device);
1013         }
1014
1015         return 0;
1016 }
1017
1018 static int asus_hotk_remove_fs(struct acpi_device *device)
1019 {
1020         if (acpi_device_dir(device)) {
1021                 remove_proc_entry(PROC_INFO, acpi_device_dir(device));
1022                 if (hotk->methods->mt_wled)
1023                         remove_proc_entry(PROC_WLED, acpi_device_dir(device));
1024                 if (hotk->methods->mt_mled)
1025                         remove_proc_entry(PROC_MLED, acpi_device_dir(device));
1026                 if (hotk->methods->mt_tled)
1027                         remove_proc_entry(PROC_TLED, acpi_device_dir(device));
1028                 if (hotk->methods->mt_ledd)
1029                         remove_proc_entry(PROC_LEDD, acpi_device_dir(device));
1030                 if (hotk->methods->mt_bt_switch)
1031                         remove_proc_entry(PROC_BT, acpi_device_dir(device));
1032                 if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status)
1033                         remove_proc_entry(PROC_LCD, acpi_device_dir(device));
1034                 if ((hotk->methods->brightness_up
1035                      && hotk->methods->brightness_down)
1036                     || (hotk->methods->brightness_get
1037                         && hotk->methods->brightness_set))
1038                         remove_proc_entry(PROC_BRN, acpi_device_dir(device));
1039                 if (hotk->methods->display_set)
1040                         remove_proc_entry(PROC_DISP, acpi_device_dir(device));
1041         }
1042         return 0;
1043 }
1044
1045 static void asus_hotk_notify(acpi_handle handle, u32 event, void *data)
1046 {
1047         /* TODO Find a better way to handle events count. */
1048         if (!hotk)
1049                 return;
1050
1051         if ((event & ~((u32) BR_UP)) < 16) {
1052                 hotk->brightness = (event & ~((u32) BR_UP));
1053         } else if ((event & ~((u32) BR_DOWN)) < 16) {
1054                 hotk->brightness = (event & ~((u32) BR_DOWN));
1055         }
1056
1057         acpi_bus_generate_event(hotk->device, event,
1058                                 hotk->event_count[event % 128]++);
1059
1060         return;
1061 }
1062
1063 /*
1064  * Match the model string to the list of supported models. Return END_MODEL if
1065  * no match or model is NULL.
1066  */
1067 static int asus_model_match(char *model)
1068 {
1069         if (model == NULL)
1070                 return END_MODEL;
1071
1072         if (strncmp(model, "L3D", 3) == 0)
1073                 return L3D;
1074         else if (strncmp(model, "L2E", 3) == 0 ||
1075                  strncmp(model, "L3H", 3) == 0 || strncmp(model, "L5D", 3) == 0)
1076                 return L3H;
1077         else if (strncmp(model, "L3", 2) == 0 || strncmp(model, "L2B", 3) == 0)
1078                 return L3C;
1079         else if (strncmp(model, "L8L", 3) == 0)
1080                 return L8L;
1081         else if (strncmp(model, "L4R", 3) == 0)
1082                 return L4R;
1083         else if (strncmp(model, "M6N", 3) == 0 || strncmp(model, "W3N", 3) == 0)
1084                 return M6N;
1085         else if (strncmp(model, "M6R", 3) == 0 || strncmp(model, "A3G", 3) == 0)
1086                 return M6R;
1087         else if (strncmp(model, "M2N", 3) == 0 ||
1088                  strncmp(model, "M3N", 3) == 0 ||
1089                  strncmp(model, "M5N", 3) == 0 ||
1090                  strncmp(model, "M6N", 3) == 0 ||
1091                  strncmp(model, "S1N", 3) == 0 ||
1092                  strncmp(model, "S5N", 3) == 0 || strncmp(model, "W1N", 3) == 0)
1093                 return xxN;
1094         else if (strncmp(model, "M1", 2) == 0)
1095                 return M1A;
1096         else if (strncmp(model, "M2", 2) == 0 || strncmp(model, "L4E", 3) == 0)
1097                 return M2E;
1098         else if (strncmp(model, "L2", 2) == 0)
1099                 return L2D;
1100         else if (strncmp(model, "L8", 2) == 0)
1101                 return S1x;
1102         else if (strncmp(model, "D1", 2) == 0)
1103                 return D1x;
1104         else if (strncmp(model, "A1", 2) == 0)
1105                 return A1x;
1106         else if (strncmp(model, "A2", 2) == 0)
1107                 return A2x;
1108         else if (strncmp(model, "J1", 2) == 0)
1109                 return S2x;
1110         else if (strncmp(model, "L5", 2) == 0)
1111                 return L5x;
1112         else if (strncmp(model, "A4G", 3) == 0)
1113                 return A4G;
1114         else if (strncmp(model, "W1N", 3) == 0)
1115                 return W1N;
1116         else if (strncmp(model, "W3V", 3) == 0)
1117                 return W3V;
1118         else if (strncmp(model, "W5A", 3) == 0)
1119                 return W5A;
1120         else
1121                 return END_MODEL;
1122 }
1123
1124 /*
1125  * This function is used to initialize the hotk with right values. In this
1126  * method, we can make all the detection we want, and modify the hotk struct
1127  */
1128 static int asus_hotk_get_info(void)
1129 {
1130         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1131         union acpi_object *model = NULL;
1132         int bsts_result;
1133         char *string = NULL;
1134         acpi_status status;
1135
1136         /*
1137          * Get DSDT headers early enough to allow for differentiating between
1138          * models, but late enough to allow acpi_bus_register_driver() to fail
1139          * before doing anything ACPI-specific. Should we encounter a machine,
1140          * which needs special handling (i.e. its hotkey device has a different
1141          * HID), this bit will be moved. A global variable asus_info contains
1142          * the DSDT header.
1143          */
1144         status = acpi_get_table(ACPI_SIG_DSDT, 1, &asus_info);
1145         if (ACPI_FAILURE(status))
1146                 printk(KERN_WARNING "  Couldn't get the DSDT table header\n");
1147
1148         /* We have to write 0 on init this far for all ASUS models */
1149         if (!write_acpi_int(hotk->handle, "INIT", 0, &buffer)) {
1150                 printk(KERN_ERR "  Hotkey initialization failed\n");
1151                 return -ENODEV;
1152         }
1153
1154         /* This needs to be called for some laptops to init properly */
1155         if (!read_acpi_int(hotk->handle, "BSTS", &bsts_result))
1156                 printk(KERN_WARNING "  Error calling BSTS\n");
1157         else if (bsts_result)
1158                 printk(KERN_NOTICE "  BSTS called, 0x%02x returned\n",
1159                        bsts_result);
1160
1161         /*
1162          * Try to match the object returned by INIT to the specific model.
1163          * Handle every possible object (or the lack of thereof) the DSDT
1164          * writers might throw at us. When in trouble, we pass NULL to
1165          * asus_model_match() and try something completely different.
1166          */
1167         if (buffer.pointer) {
1168                 model = buffer.pointer;
1169                 switch (model->type) {
1170                 case ACPI_TYPE_STRING:
1171                         string = model->string.pointer;
1172                         break;
1173                 case ACPI_TYPE_BUFFER:
1174                         string = model->buffer.pointer;
1175                         break;
1176                 default:
1177                         kfree(model);
1178                         break;
1179                 }
1180         }
1181         hotk->model = asus_model_match(string);
1182         if (hotk->model == END_MODEL) { /* match failed */
1183                 if (asus_info &&
1184                     strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) {
1185                         hotk->model = P30;
1186                         printk(KERN_NOTICE
1187                                "  Samsung P30 detected, supported\n");
1188                 } else {
1189                         hotk->model = M2E;
1190                         printk(KERN_NOTICE "  unsupported model %s, trying "
1191                                "default values\n", string);
1192                         printk(KERN_NOTICE
1193                                "  send /proc/acpi/dsdt to the developers\n");
1194                 }
1195                 hotk->methods = &model_conf[hotk->model];
1196                 return AE_OK;
1197         }
1198         hotk->methods = &model_conf[hotk->model];
1199         printk(KERN_NOTICE "  %s model detected, supported\n", string);
1200
1201         /* Sort of per-model blacklist */
1202         if (strncmp(string, "L2B", 3) == 0)
1203                 hotk->methods->lcd_status = NULL;
1204         /* L2B is similar enough to L3C to use its settings, with this only
1205            exception */
1206         else if (strncmp(string, "A3G", 3) == 0)
1207                 hotk->methods->lcd_status = "\\BLFG";
1208         /* A3G is like M6R */
1209         else if (strncmp(string, "S5N", 3) == 0 ||
1210                  strncmp(string, "M5N", 3) == 0 ||
1211                  strncmp(string, "W3N", 3) == 0)
1212                 hotk->methods->mt_mled = NULL;
1213         /* S5N, M5N and W3N have no MLED */
1214         else if (strncmp(string, "L5D", 3) == 0)
1215                 hotk->methods->mt_wled = NULL;
1216         /* L5D's WLED is not controlled by ACPI */
1217         else if (strncmp(string, "M2N", 3) == 0 ||
1218                  strncmp(string, "W3V", 3) == 0 ||
1219                  strncmp(string, "S1N", 3) == 0)
1220                 hotk->methods->mt_wled = "WLED";
1221         /* M2N, S1N and W3V have a usable WLED */
1222         else if (asus_info) {
1223                 if (strncmp(asus_info->oem_table_id, "L1", 2) == 0)
1224                         hotk->methods->mled_status = NULL;
1225                 /* S1300A reports L84F, but L1400B too, account for that */
1226         }
1227
1228         kfree(model);
1229
1230         return AE_OK;
1231 }
1232
1233 static int asus_hotk_check(void)
1234 {
1235         int result = 0;
1236
1237         result = acpi_bus_get_status(hotk->device);
1238         if (result)
1239                 return result;
1240
1241         if (hotk->device->status.present) {
1242                 result = asus_hotk_get_info();
1243         } else {
1244                 printk(KERN_ERR "  Hotkey device not present, aborting\n");
1245                 return -EINVAL;
1246         }
1247
1248         return result;
1249 }
1250
1251 static int asus_hotk_found;
1252
1253 static int asus_hotk_add(struct acpi_device *device)
1254 {
1255         acpi_status status = AE_OK;
1256         int result;
1257
1258         if (!device)
1259                 return -EINVAL;
1260
1261         printk(KERN_NOTICE "Asus Laptop ACPI Extras version %s\n",
1262                ASUS_ACPI_VERSION);
1263
1264         hotk = kzalloc(sizeof(struct asus_hotk), GFP_KERNEL);
1265         if (!hotk)
1266                 return -ENOMEM;
1267
1268         hotk->handle = device->handle;
1269         strcpy(acpi_device_name(device), ACPI_HOTK_DEVICE_NAME);
1270         strcpy(acpi_device_class(device), ACPI_HOTK_CLASS);
1271         acpi_driver_data(device) = hotk;
1272         hotk->device = device;
1273
1274         result = asus_hotk_check();
1275         if (result)
1276                 goto end;
1277
1278         result = asus_hotk_add_fs(device);
1279         if (result)
1280                 goto end;
1281
1282         /*
1283          * We install the handler, it will receive the hotk in parameter, so, we
1284          * could add other data to the hotk struct
1285          */
1286         status = acpi_install_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1287                                              asus_hotk_notify, hotk);
1288         if (ACPI_FAILURE(status))
1289                 printk(KERN_ERR "  Error installing notify handler\n");
1290
1291         /* For laptops without GPLV: init the hotk->brightness value */
1292         if ((!hotk->methods->brightness_get)
1293             && (!hotk->methods->brightness_status)
1294             && (hotk->methods->brightness_up && hotk->methods->brightness_down)) {
1295                 status =
1296                     acpi_evaluate_object(NULL, hotk->methods->brightness_down,
1297                                          NULL, NULL);
1298                 if (ACPI_FAILURE(status))
1299                         printk(KERN_WARNING "  Error changing brightness\n");
1300                 else {
1301                         status =
1302                             acpi_evaluate_object(NULL,
1303                                                  hotk->methods->brightness_up,
1304                                                  NULL, NULL);
1305                         if (ACPI_FAILURE(status))
1306                                 printk(KERN_WARNING "  Strange, error changing"
1307                                        " brightness\n");
1308                 }
1309         }
1310
1311         asus_hotk_found = 1;
1312
1313         /* LED display is off by default */
1314         hotk->ledd_status = 0xFFF;
1315
1316       end:
1317         if (result) {
1318                 kfree(hotk);
1319         }
1320
1321         return result;
1322 }
1323
1324 static int asus_hotk_remove(struct acpi_device *device, int type)
1325 {
1326         acpi_status status = 0;
1327
1328         if (!device || !acpi_driver_data(device))
1329                 return -EINVAL;
1330
1331         status = acpi_remove_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1332                                             asus_hotk_notify);
1333         if (ACPI_FAILURE(status))
1334                 printk(KERN_ERR "Asus ACPI: Error removing notify handler\n");
1335
1336         asus_hotk_remove_fs(device);
1337
1338         kfree(hotk);
1339
1340         return 0;
1341 }
1342
1343 static struct backlight_properties asus_backlight_data = {
1344         .owner          = THIS_MODULE,
1345         .get_brightness = read_brightness,
1346         .update_status  = set_brightness_status,
1347         .max_brightness = 15,
1348 };
1349
1350 static void __exit asus_acpi_exit(void)
1351 {
1352         if (asus_backlight_device)
1353                 backlight_device_unregister(asus_backlight_device);
1354
1355         acpi_bus_unregister_driver(&asus_hotk_driver);
1356         remove_proc_entry(PROC_ASUS, acpi_root_dir);
1357
1358         return;
1359 }
1360
1361 static int __init asus_acpi_init(void)
1362 {
1363         int result;
1364
1365         if (acpi_disabled)
1366                 return -ENODEV;
1367
1368         if (!acpi_specific_hotkey_enabled) {
1369                 printk(KERN_ERR "Using generic hotkey driver\n");
1370                 return -ENODEV;
1371         }
1372         asus_proc_dir = proc_mkdir(PROC_ASUS, acpi_root_dir);
1373         if (!asus_proc_dir) {
1374                 printk(KERN_ERR "Asus ACPI: Unable to create /proc entry\n");
1375                 return -ENODEV;
1376         }
1377         asus_proc_dir->owner = THIS_MODULE;
1378
1379         result = acpi_bus_register_driver(&asus_hotk_driver);
1380         if (result < 0) {
1381                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1382                 return result;
1383         }
1384
1385         /*
1386          * This is a bit of a kludge.  We only want this module loaded
1387          * for ASUS systems, but there's currently no way to probe the
1388          * ACPI namespace for ASUS HIDs.  So we just return failure if
1389          * we didn't find one, which will cause the module to be
1390          * unloaded.
1391          */
1392         if (!asus_hotk_found) {
1393                 acpi_bus_unregister_driver(&asus_hotk_driver);
1394                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1395                 return result;
1396         }
1397
1398         asus_backlight_device = backlight_device_register("asus",NULL,NULL,
1399                                                           &asus_backlight_data);
1400         if (IS_ERR(asus_backlight_device)) {
1401                 printk(KERN_ERR "Could not register asus backlight device\n");
1402                 asus_backlight_device = NULL;
1403                 asus_acpi_exit();
1404         }
1405
1406         return 0;
1407 }
1408
1409 module_init(asus_acpi_init);
1410 module_exit(asus_acpi_exit);