drivers/acpi/asus_acpi.c

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