drivers/acpi/asus_acpi.c

   1 /*
   2  *  asus_acpi.c - Asus Laptop ACPI Extras
   3  *
   4  *
   5  *  Copyright (C) 2002, 2003, 2004 Julien Lerouge, 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  *
  30  *  TODO:
  31  *  add Fn key status
  32  *  Add mode selection on module loading (parameter) -> still necessary?
  33  *  Complete display switching -- may require dirty hacks or calling _DOS?
  34  */
  35
  36 #include <linux/kernel.h>
  37 #include <linux/module.h>
  38 #include <linux/init.h>
  39 #include <linux/types.h>
  40 #include <linux/proc_fs.h>
  41 #include <acpi/acpi_drivers.h>
  42 #include <acpi/acpi_bus.h>
  43 #include <asm/uaccess.h>
  44
  45 #define ASUS_ACPI_VERSION "0.29"
  46
  47 #define PROC_ASUS       "asus"  //the directory
  48 #define PROC_MLED       "mled"
  49 #define PROC_WLED       "wled"
  50 #define PROC_TLED       "tled"
  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        //is MLED ON ?
  71 #define WLED_ON     0x02
  72 #define TLED_ON     0x04
  73
  74 MODULE_AUTHOR("Julien Lerouge, Karol Kozimor");
  75 MODULE_DESCRIPTION(ACPI_HOTK_NAME);
  76 MODULE_LICENSE("GPL");
  77
  78
  79 static uid_t asus_uid;
  80 static gid_t asus_gid;
  81 module_param(asus_uid, uint, 0);
  82 MODULE_PARM_DESC(uid, "UID for entries in /proc/acpi/asus.\n");
  83 module_param(asus_gid, uint, 0);
  84 MODULE_PARM_DESC(gid, "GID for entries in /proc/acpi/asus.\n");
  85
  86
  87 /* For each model, all features implemented,
  88  * those marked with R are relative to HOTK, A for absolute */
  89 struct model_data {
  90         char *name;              //name of the laptop________________A
  91         char *mt_mled;           //method to handle mled_____________R
  92         char *mled_status;       //node to handle mled reading_______A
  93         char *mt_wled;           //method to handle wled_____________R
  94         char *wled_status;       //node to handle wled reading_______A
  95         char *mt_tled;           //method to handle tled_____________R
  96         char *tled_status;       //node to handle tled reading_______A
  97         char *mt_lcd_switch;     //method to turn LCD ON/OFF_________A
  98         char *lcd_status;        //node to read LCD panel state______A
  99         char *brightness_up;     //method to set brightness up_______A
 100         char *brightness_down;   //guess what ?______________________A
 101         char *brightness_set;    //method to set absolute brightness_R
 102         char *brightness_get;    //method to get absolute brightness_R
 103         char *brightness_status; //node to get brightness____________A
 104         char *display_set;       //method to set video output________R
 105         char *display_get;       //method to get video output________R
 106 };
 107
 108 /*
 109  * This is the main structure, we can use it to store anything interesting
 110  * about the hotk device
 111  */
 112 struct asus_hotk {
 113         struct acpi_device *device; //the device we are in
 114         acpi_handle handle;         //the handle of the hotk device
 115         char status;                //status of the hotk, for LEDs, ...
 116         struct model_data *methods; //methods available on the laptop
 117         u8 brightness;              //brightness level
 118         enum {
 119                 A1x = 0,  //A1340D, A1300F
 120                 A2x,      //A2500H
 121                 D1x,      //D1
 122                 L2D,      //L2000D
 123                 L3C,      //L3800C
 124                 L3D,      //L3400D
 125                 L3H,      //L3H, but also L2000E
 126                 L4R,      //L4500R
 127                 L5x,      //L5800C
 128                 L8L,      //L8400L
 129                 M1A,      //M1300A
 130                 M2E,      //M2400E, L4400L
 131                 M6N,      //M6800N
 132                 M6R,      //M6700R
 133                 P30,      //Samsung P30
 134                 S1x,      //S1300A, but also L1400B and M2400A (L84F)
 135                 S2x,      //S200 (J1 reported), Victor MP-XP7210
 136                 xxN,      //M2400N, M3700N, M5200N, S1300N, S5200N, W1OOON
 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          * Those pathnames are relative to the HOTK / ATKD device :
 155          *       - mt_mled
 156          *       - mt_wled
 157          *       - brightness_set
 158          *       - brightness_get
 159          *       - display_set
 160          *       - display_get
 161          *
 162          * TODO I have seen a SWBX and AIBX method on some models, like L1400B,
 163          * it seems to be a kind of switch, but what for ?
 164          *
 165          */
 166
 167         {
 168                 .name              = "A1x",
 169                 .mt_mled           = "MLED",
 170                 .mled_status       = "\\MAIL",
 171                 .mt_lcd_switch     = A1x_PREFIX "_Q10",
 172                 .lcd_status        = "\\BKLI",
 173                 .brightness_up     = A1x_PREFIX "_Q0E",
 174                 .brightness_down   = A1x_PREFIX "_Q0F"
 175         },
 176
 177         {
 178                 .name              = "A2x",
 179                 .mt_mled           = "MLED",
 180                 .mt_wled           = "WLED",
 181                 .wled_status       = "\\SG66",
 182                 .mt_lcd_switch     = "\\Q10",
 183                 .lcd_status        = "\\BAOF",
 184                 .brightness_set    = "SPLV",
 185                 .brightness_get    = "GPLV",
 186                 .display_set       = "SDSP",
 187                 .display_get       = "\\INFB"
 188         },
 189
 190         {
 191                 .name              = "D1x",
 192                 .mt_mled           = "MLED",
 193                 .mt_lcd_switch     = "\\Q0D",
 194                 .lcd_status        = "\\GP11",
 195                 .brightness_up     = "\\Q0C",
 196                 .brightness_down   = "\\Q0B",
 197                 .brightness_status = "\\BLVL",
 198                 .display_set       = "SDSP",
 199                 .display_get       = "\\INFB"
 200         },
 201
 202         {
 203                 .name              = "L2D",
 204                 .mt_mled           = "MLED",
 205                 .mled_status       = "\\SGP6",
 206                 .mt_wled           = "WLED",
 207                 .wled_status       = "\\RCP3",
 208                 .mt_lcd_switch     = "\\Q10",
 209                 .lcd_status        = "\\SGP0",
 210                 .brightness_up     = "\\Q0E",
 211                 .brightness_down   = "\\Q0F",
 212                 .display_set       = "SDSP",
 213                 .display_get       = "\\INFB"
 214         },
 215
 216         {
 217                 .name              = "L3C",
 218                 .mt_mled           = "MLED",
 219                 .mt_wled           = "WLED",
 220                 .mt_lcd_switch     = L3C_PREFIX "_Q10",
 221                 .lcd_status        = "\\GL32",
 222                 .brightness_set    = "SPLV",
 223                 .brightness_get    = "GPLV",
 224                 .display_set       = "SDSP",
 225                 .display_get       = "\\_SB.PCI0.PCI1.VGAC.NMAP"
 226         },
 227
 228         {
 229                 .name              = "L3D",
 230                 .mt_mled           = "MLED",
 231                 .mled_status       = "\\MALD",
 232                 .mt_wled           = "WLED",
 233                 .mt_lcd_switch     = "\\Q10",
 234                 .lcd_status        = "\\BKLG",
 235                 .brightness_set    = "SPLV",
 236                 .brightness_get    = "GPLV",
 237                 .display_set       = "SDSP",
 238                 .display_get       = "\\INFB"
 239         },
 240
 241         {
 242                 .name              = "L3H",
 243                 .mt_mled           = "MLED",
 244                 .mt_wled           = "WLED",
 245                 .mt_lcd_switch     = "EHK",
 246                 .lcd_status        = "\\_SB.PCI0.PM.PBC",
 247                 .brightness_set    = "SPLV",
 248                 .brightness_get    = "GPLV",
 249                 .display_set       = "SDSP",
 250                 .display_get       = "\\INFB"
 251         },
 252
 253         {
 254                 .name              = "L4R",
 255                 .mt_mled           = "MLED",
 256                 .mt_wled           = "WLED",
 257                 .wled_status       = "\\_SB.PCI0.SBRG.SG13",
 258                 .mt_lcd_switch     = xxN_PREFIX "_Q10",
 259                 .lcd_status        = "\\_SB.PCI0.SBSM.SEO4",
 260                 .brightness_set    = "SPLV",
 261                 .brightness_get    = "GPLV",
 262                 .display_set       = "SDSP",
 263                 .display_get       = "\\_SB.PCI0.P0P1.VGA.GETD"
 264         },
 265
 266         {
 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         {
 280                 .name              = "L8L"
 281 /* No features, but at least support the hotkeys */
 282         },
 283
 284         {
 285                 .name              = "M1A",
 286                 .mt_mled           = "MLED",
 287                 .mt_lcd_switch     = M1A_PREFIX "Q10",
 288                 .lcd_status        = "\\PNOF",
 289                 .brightness_up     = M1A_PREFIX "Q0E",
 290                 .brightness_down   = M1A_PREFIX "Q0F",
 291                 .brightness_status = "\\BRIT",
 292                 .display_set       = "SDSP",
 293                 .display_get       = "\\INFB"
 294         },
 295
 296         {
 297                 .name              = "M2E",
 298                 .mt_mled           = "MLED",
 299                 .mt_wled           = "WLED",
 300                 .mt_lcd_switch     = "\\Q10",
 301                 .lcd_status        = "\\GP06",
 302                 .brightness_set    = "SPLV",
 303                 .brightness_get    = "GPLV",
 304                 .display_set       = "SDSP",
 305                 .display_get       = "\\INFB"
 306         },
 307
 308         {
 309                 .name              = "M6N",
 310                 .mt_mled           = "MLED",
 311                 .mt_wled           = "WLED",
 312                 .wled_status       = "\\_SB.PCI0.SBRG.SG13",
 313                 .mt_lcd_switch     = xxN_PREFIX "_Q10",
 314                 .lcd_status        = "\\_SB.BKLT",
 315                 .brightness_set    = "SPLV",
 316                 .brightness_get    = "GPLV",
 317                 .display_set       = "SDSP",
 318                 .display_get       = "\\SSTE"
 319         },
 320         {
 321                 .name              = "M6R",
 322                 .mt_mled           = "MLED",
 323                 .mt_wled           = "WLED",
 324                 .mt_lcd_switch     = xxN_PREFIX "_Q10",
 325                 .lcd_status        = "\\_SB.PCI0.SBSM.SEO4",
 326                 .brightness_set    = "SPLV",
 327                 .brightness_get    = "GPLV",
 328                 .display_set       = "SDSP",
 329                 .display_get       = "\\SSTE"
 330         },
 331
 332
 333         {
 334                 .name              = "P30",
 335                 .mt_wled           = "WLED",
 336                 .mt_lcd_switch     = P30_PREFIX "_Q0E",
 337                 .lcd_status        = "\\BKLT",
 338                 .brightness_up     = P30_PREFIX "_Q68",
 339                 .brightness_down   = P30_PREFIX "_Q69",
 340                 .brightness_get    = "GPLV",
 341                 .display_set       = "SDSP",
 342                 .display_get       = "\\DNXT"
 343         },
 344
 345         {
 346                 .name              = "S1x",
 347                 .mt_mled           = "MLED",
 348                 .mled_status       = "\\EMLE",
 349                 .mt_wled           = "WLED",
 350                 .mt_lcd_switch     = S1x_PREFIX "Q10" ,
 351                 .lcd_status        = "\\PNOF",
 352                 .brightness_set    = "SPLV",
 353                 .brightness_get    = "GPLV"
 354         },
 355
 356         {
 357                 .name              = "S2x",
 358                 .mt_mled           = "MLED",
 359                 .mled_status       = "\\MAIL",
 360                 .mt_lcd_switch     = S2x_PREFIX "_Q10",
 361                 .lcd_status        = "\\BKLI",
 362                 .brightness_up     = S2x_PREFIX "_Q0B",
 363                 .brightness_down   = S2x_PREFIX "_Q0A"
 364         },
 365
 366         {
 367                 .name              = "xxN",
 368                 .mt_mled           = "MLED",
 369 /* WLED present, but not controlled by ACPI */
 370                 .mt_lcd_switch     = xxN_PREFIX "_Q10",
 371                 .lcd_status        = "\\BKLT",
 372                 .brightness_set    = "SPLV",
 373                 .brightness_get    = "GPLV",
 374                 .display_set       = "SDSP",
 375                 .display_get       = "\\ADVG"
 376         }
 377 };
 378
 379 /* procdir we use */
 380 static struct proc_dir_entry *asus_proc_dir;
 381
 382 /*
 383  * This header is made available to allow proper configuration given model,
 384  * revision number , ... this info cannot go in struct asus_hotk because it is
 385  * available before the hotk
 386  */
 387 static struct acpi_table_header *asus_info;
 388
 389 /* The actual device the driver binds to */
 390 static struct asus_hotk *hotk;
 391
 392 /*
 393  * The hotkey driver declaration
 394  */
 395 static int asus_hotk_add(struct acpi_device *device);
 396 static int asus_hotk_remove(struct acpi_device *device, int type);
 397 static struct acpi_driver asus_hotk_driver = {
 398         .name =         ACPI_HOTK_NAME,
 399         .class =        ACPI_HOTK_CLASS,
 400         .ids =          ACPI_HOTK_HID,
 401         .ops =          {
 402                                 .add =          asus_hotk_add,
 403                                 .remove =       asus_hotk_remove,
 404                         },
 405 };
 406
 407 /*
 408  * This function evaluates an ACPI method, given an int as parameter, the
 409  * method is searched within the scope of the handle, can be NULL. The output
 410  * of the method is written is output, which can also be NULL
 411  *
 412  * returns 1 if write is successful, 0 else.
 413  */
 414 static int write_acpi_int(acpi_handle handle, const char *method, int val,
 415                           struct acpi_buffer *output)
 416 {
 417         struct acpi_object_list params; //list of input parameters (an int here)
 418         union acpi_object in_obj;       //the only param we use
 419         acpi_status status;
 420
 421         params.count = 1;
 422         params.pointer = &in_obj;
 423         in_obj.type = ACPI_TYPE_INTEGER;
 424         in_obj.integer.value = val;
 425
 426         status = acpi_evaluate_object(handle, (char *) method, &params, output);
 427         return (status == AE_OK);
 428 }
 429
 430
 431 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
 432 {
 433         struct acpi_buffer output;
 434         union acpi_object out_obj;
 435         acpi_status status;
 436
 437         output.length = sizeof(out_obj);
 438         output.pointer = &out_obj;
 439
 440         status = acpi_evaluate_object(handle, (char *) method, NULL, &output);
 441         *val = out_obj.integer.value;
 442         return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
 443 }
 444
 445 /*
 446  * We write our info in page, we begin at offset off and cannot write more
 447  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 448  * number of bytes written in page
 449  */
 450 static int
 451 proc_read_info(char *page, char **start, off_t off, int count, int *eof,
 452                 void *data)
 453 {
 454         int len = 0;
 455         int temp;
 456         char buf[16];           //enough for all info
 457         /*
 458          * We use the easy way, we don't care of off and count, so we don't set eof
 459          * to 1
 460          */
 461
 462         len += sprintf(page, ACPI_HOTK_NAME " " ASUS_ACPI_VERSION "\n");
 463         len += sprintf(page + len, "Model reference    : %s\n",
 464                        hotk->methods->name);
 465         /*
 466          * The SFUN method probably allows the original driver to get the list
 467          * of features supported by a given model. For now, 0x0100 or 0x0800
 468          * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
 469          * The significance of others is yet to be found.
 470          */
 471         if (read_acpi_int(hotk->handle, "SFUN", &temp))
 472                 len += sprintf(page + len, "SFUN value         : 0x%04x\n", temp);
 473         /*
 474          * Another value for userspace: the ASYM method returns 0x02 for
 475          * battery low and 0x04 for battery critical, its readings tend to be
 476          * more accurate than those provided by _BST.
 477          * Note: since not all the laptops provide this method, errors are
 478          * silently ignored.
 479          */
 480         if (read_acpi_int(hotk->handle, "ASYM", &temp))
 481                 len += sprintf(page + len, "ASYM value         : 0x%04x\n", temp);
 482         if (asus_info) {
 483                 snprintf(buf, 16, "%d", asus_info->length);
 484                 len += sprintf(page + len, "DSDT length        : %s\n", buf);
 485                 snprintf(buf, 16, "%d", asus_info->checksum);
 486                 len += sprintf(page + len, "DSDT checksum      : %s\n", buf);
 487                 snprintf(buf, 16, "%d", asus_info->revision);
 488                 len += sprintf(page + len, "DSDT revision      : %s\n", buf);
 489                 snprintf(buf, 7, "%s", asus_info->oem_id);
 490                 len += sprintf(page + len, "OEM id             : %s\n", buf);
 491                 snprintf(buf, 9, "%s", asus_info->oem_table_id);
 492                 len += sprintf(page + len, "OEM table id       : %s\n", buf);
 493                 snprintf(buf, 16, "%x", asus_info->oem_revision);
 494                 len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);
 495                 snprintf(buf, 5, "%s", asus_info->asl_compiler_id);
 496                 len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
 497                 snprintf(buf, 16, "%x", asus_info->asl_compiler_revision);
 498                 len += sprintf(page + len, "ASL comp revision  : 0x%s\n", buf);
 499         }
 500
 501         return len;
 502 }
 503
 504
 505 /*
 506  * /proc handlers
 507  * We write our info in page, we begin at offset off and cannot write more
 508  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 509  * number of bytes written in page
 510  */
 511
 512 /* Generic LED functions */
 513 static int
 514 read_led(const char *ledname, int ledmask)
 515 {
 516         if (ledname) {
 517                 int led_status;
 518
 519                 if (read_acpi_int(NULL, ledname, &led_status))
 520                         return led_status;
 521                 else
 522                         printk(KERN_WARNING "Asus ACPI: Error reading LED "
 523                                "status\n");
 524         }
 525         return (hotk->status & ledmask) ? 1 : 0;
 526 }
 527
 528 static int parse_arg(const char __user *buf, unsigned long count, int *val)
 529 {
 530         char s[32];
 531         if (!count)
 532                 return 0;
 533         if (count > 31)
 534                 return -EINVAL;
 535         if (copy_from_user(s, buf, count))
 536                 return -EFAULT;
 537         s[count] = 0;
 538         if (sscanf(s, "%i", val) != 1)
 539                 return -EINVAL;
 540         return count;
 541 }
 542
 543 /* FIXME: kill extraneous args so it can be called independently */
 544 static int
 545 write_led(const char __user *buffer, unsigned long count,
 546           char *ledname, int ledmask, int invert)
 547 {
 548         int value;
 549         int led_out = 0;
 550
 551         count = parse_arg(buffer, count, &value);
 552         if (count > 0)
 553                 led_out = value ? 1 : 0;
 554
 555         hotk->status =
 556             (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);
 557
 558         if (invert) /* invert target value */
 559                 led_out = !led_out & 0x1;
 560
 561         if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
 562                 printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n", ledname);
 563
 564         return count;
 565 }
 566
 567
 568 /*
 569  * Proc handlers for MLED
 570  */
 571 static int
 572 proc_read_mled(char *page, char **start, off_t off, int count, int *eof,
 573                void *data)
 574 {
 575         return sprintf(page, "%d\n", read_led(hotk->methods->mled_status, MLED_ON));
 576 }
 577
 578
 579 static int
 580 proc_write_mled(struct file *file, const char __user *buffer,
 581                 unsigned long count, void *data)
 582 {
 583         return write_led(buffer, count, hotk->methods->mt_mled, MLED_ON, 1);
 584 }
 585
 586 /*
 587  * Proc handlers for WLED
 588  */
 589 static int
 590 proc_read_wled(char *page, char **start, off_t off, int count, int *eof,
 591                void *data)
 592 {
 593         return sprintf(page, "%d\n", read_led(hotk->methods->wled_status, WLED_ON));
 594 }
 595
 596 static int
 597 proc_write_wled(struct file *file, const char __user *buffer,
 598                 unsigned long count, void *data)
 599 {
 600         return write_led(buffer, count, hotk->methods->mt_wled, WLED_ON, 0);
 601 }
 602
 603 /*
 604  * Proc handlers for TLED
 605  */
 606 static int
 607 proc_read_tled(char *page, char **start, off_t off, int count, int *eof,
 608                void *data)
 609 {
 610         return sprintf(page, "%d\n", read_led(hotk->methods->tled_status, TLED_ON));
 611 }
 612
 613 static int
 614 proc_write_tled(struct file *file, const char __user *buffer,
 615                 unsigned long count, void *data)
 616 {
 617         return write_led(buffer, count, hotk->methods->mt_tled, TLED_ON, 0);
 618 }
 619
 620
 621 static int get_lcd_state(void)
 622 {
 623         int lcd = 0;
 624
 625         if (hotk->model != L3H) {
 626         /* We don't have to check anything if we are here */
 627                 if (!read_acpi_int(NULL, hotk->methods->lcd_status, &lcd))
 628                         printk(KERN_WARNING "Asus ACPI: Error reading LCD status\n");
 629
 630                 if (hotk->model == L2D)
 631                         lcd = ~lcd;
 632         } else { /* L3H and the like have to be handled differently */
 633                 acpi_status status = 0;
 634                 struct acpi_object_list input;
 635                 union acpi_object mt_params[2];
 636                 struct acpi_buffer output;
 637                 union acpi_object out_obj;
 638
 639                 input.count = 2;
 640                 input.pointer = mt_params;
 641                 /* Note: the following values are partly guessed up, but
 642                    otherwise they seem to work */
 643                 mt_params[0].type = ACPI_TYPE_INTEGER;
 644                 mt_params[0].integer.value = 0x02;
 645                 mt_params[1].type = ACPI_TYPE_INTEGER;
 646                 mt_params[1].integer.value = 0x02;
 647
 648                 output.length = sizeof(out_obj);
 649                 output.pointer = &out_obj;
 650
 651                 status = acpi_evaluate_object(NULL, hotk->methods->lcd_status, &input, &output);
 652                 if (status != AE_OK)
 653                         return -1;
 654                 if (out_obj.type == ACPI_TYPE_INTEGER)
 655                         /* That's what the AML code does */
 656                         lcd = out_obj.integer.value >> 8;
 657         }
 658
 659         return (lcd & 1);
 660 }
 661
 662 static int set_lcd_state(int value)
 663 {
 664         int lcd = 0;
 665         acpi_status status = 0;
 666
 667         lcd = value ? 1 : 0;
 668         if (lcd != get_lcd_state()) {
 669                 /* switch */
 670                 if (hotk->model != L3H) {
 671                         status =
 672                             acpi_evaluate_object(NULL, hotk->methods->mt_lcd_switch,
 673                                                  NULL, NULL);
 674                 } else { /* L3H and the like have to be handled differently */
 675                         if (!write_acpi_int(hotk->handle, hotk->methods->mt_lcd_switch, 0x07, NULL))
 676                                 status = AE_ERROR;
 677                         /* L3H's AML executes EHK (0x07) upon Fn+F7 keypress,
 678                            the exact behaviour is simulated here */
 679                 }
 680                 if (ACPI_FAILURE(status))
 681                         printk(KERN_WARNING "Asus ACPI: Error switching LCD\n");
 682         }
 683         return 0;
 684
 685 }
 686
 687 static int
 688 proc_read_lcd(char *page, char **start, off_t off, int count, int *eof,
 689               void *data)
 690 {
 691         return sprintf(page, "%d\n", get_lcd_state());
 692 }
 693
 694
 695 static int
 696 proc_write_lcd(struct file *file, const char __user *buffer,
 697                unsigned long count, void *data)
 698 {
 699         int value;
 700
 701         count = parse_arg(buffer, count, &value);
 702         if (count > 0)
 703                 set_lcd_state(value);
 704         return count;
 705 }
 706
 707
 708 static int read_brightness(void)
 709 {
 710         int value;
 711
 712         if(hotk->methods->brightness_get) { /* SPLV/GPLV laptop */
 713                 if (!read_acpi_int(hotk->handle, hotk->methods->brightness_get,
 714                                    &value))
 715                         printk(KERN_WARNING "Asus ACPI: Error reading brightness\n");
 716         } else if (hotk->methods->brightness_status) { /* For D1 for example */
 717                 if (!read_acpi_int(NULL, hotk->methods->brightness_status,
 718                                    &value))
 719                         printk(KERN_WARNING "Asus ACPI: Error reading brightness\n");
 720         } else /* No GPLV method */
 721                 value = hotk->brightness;
 722         return value;
 723 }
 724
 725 /*
 726  * Change the brightness level
 727  */
 728 static void set_brightness(int value)
 729 {
 730         acpi_status status = 0;
 731
 732         /* SPLV laptop */
 733         if(hotk->methods->brightness_set) {
 734                 if (!write_acpi_int(hotk->handle, hotk->methods->brightness_set,
 735                                     value, NULL))
 736                         printk(KERN_WARNING "Asus ACPI: Error changing brightness\n");
 737                 return;
 738         }
 739
 740         /* No SPLV method if we are here, act as appropriate */
 741         value -= read_brightness();
 742         while (value != 0) {
 743                 status = acpi_evaluate_object(NULL, (value > 0) ?
 744                                               hotk->methods->brightness_up :
 745                                               hotk->methods->brightness_down,
 746                                               NULL, NULL);
 747                 (value > 0) ? value-- : value++;
 748                 if (ACPI_FAILURE(status))
 749                         printk(KERN_WARNING "Asus ACPI: Error changing brightness\n");
 750         }
 751         return;
 752 }
 753
 754 static int
 755 proc_read_brn(char *page, char **start, off_t off, int count, int *eof,
 756               void *data)
 757 {
 758         return sprintf(page, "%d\n", read_brightness());
 759 }
 760
 761 static int
 762 proc_write_brn(struct file *file, const char __user *buffer,
 763                unsigned long count, void *data)
 764 {
 765         int value;
 766
 767         count = parse_arg(buffer, count, &value);
 768         if (count > 0) {
 769                 value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
 770                         /* 0 <= value <= 15 */
 771                 set_brightness(value);
 772         } else if (count < 0) {
 773                 printk(KERN_WARNING "Asus ACPI: Error reading user input\n");
 774         }
 775
 776         return count;
 777 }
 778
 779 static void set_display(int value)
 780 {
 781         /* no sanity check needed for now */
 782         if (!write_acpi_int(hotk->handle, hotk->methods->display_set,
 783                             value, NULL))
 784                 printk(KERN_WARNING "Asus ACPI: Error setting display\n");
 785         return;
 786 }
 787
 788 /*
 789  * Now, *this* one could be more user-friendly, but so far, no-one has
 790  * complained. The significance of bits is the same as in proc_write_disp()
 791  */
 792 static int
 793 proc_read_disp(char *page, char **start, off_t off, int count, int *eof,
 794               void *data)
 795 {
 796         int value = 0;
 797
 798         if (!read_acpi_int(hotk->handle, hotk->methods->display_get, &value))
 799                 printk(KERN_WARNING "Asus ACPI: Error reading display status\n");
 800         value &= 0x07; /* needed for some models, shouldn't hurt others */
 801         return sprintf(page, "%d\n", value);
 802 }
 803
 804 /*
 805  * Experimental support for display switching. As of now: 1 should activate
 806  * the LCD output, 2 should do for CRT, and 4 for TV-Out. Any combination
 807  * (bitwise) of these will suffice. I never actually tested 3 displays hooked up
 808  * simultaneously, so be warned. See the acpi4asus README for more info.
 809  */
 810 static int
 811 proc_write_disp(struct file *file, const char __user *buffer,
 812                unsigned long count, void *data)
 813 {
 814         int value;
 815
 816         count = parse_arg(buffer, count, &value);
 817         if (count > 0)
 818                 set_display(value);
 819         else if (count < 0)
 820                 printk(KERN_WARNING "Asus ACPI: Error reading user input\n");
 821
 822         return count;
 823 }
 824
 825
 826 typedef int (proc_readfunc)(char *page, char **start, off_t off, int count,
 827                              int *eof, void *data);
 828 typedef int (proc_writefunc)(struct file *file, const char __user *buffer,
 829                               unsigned long count, void *data);
 830
 831 static int
 832 __init asus_proc_add(char *name, proc_writefunc *writefunc,
 833                      proc_readfunc *readfunc, mode_t mode,
 834                      struct acpi_device *device)
 835 {
 836         struct proc_dir_entry *proc = create_proc_entry(name, mode, acpi_device_dir(device));
 837         if(!proc) {
 838                 printk(KERN_WARNING "  Unable to create %s fs entry\n", name);
 839                 return -1;
 840         }
 841         proc->write_proc = writefunc;
 842         proc->read_proc = readfunc;
 843         proc->data = acpi_driver_data(device);
 844         proc->owner = THIS_MODULE;
 845         proc->uid = asus_uid;
 846         proc->gid = asus_gid;
 847         return 0;
 848 }
 849
 850 static int __init asus_hotk_add_fs(struct acpi_device *device)
 851 {
 852         struct proc_dir_entry *proc;
 853         mode_t mode;
 854
 855         /*
 856          * If parameter uid or gid is not changed, keep the default setting for
 857          * our proc entries (-rw-rw-rw-) else, it means we care about security,
 858          * and then set to -rw-rw----
 859          */
 860
 861         if ((asus_uid == 0) && (asus_gid == 0)){
 862                 mode = S_IFREG | S_IRUGO | S_IWUGO;
 863         } else {
 864                 mode = S_IFREG | S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
 865         }
 866
 867         acpi_device_dir(device) = asus_proc_dir;
 868         if (!acpi_device_dir(device))
 869                 return -ENODEV;
 870
 871         proc = create_proc_entry(PROC_INFO, mode, acpi_device_dir(device));
 872         if (proc) {
 873                 proc->read_proc = proc_read_info;
 874                 proc->data = acpi_driver_data(device);
 875                 proc->owner = THIS_MODULE;
 876                 proc->uid = asus_uid;
 877                 proc->gid = asus_gid;
 878         } else {
 879                 printk(KERN_WARNING "  Unable to create " PROC_INFO
 880                        " fs entry\n");
 881         }
 882
 883         if (hotk->methods->mt_wled) {
 884                 asus_proc_add(PROC_WLED, &proc_write_wled, &proc_read_wled, mode, device);
 885         }
 886
 887         if (hotk->methods->mt_mled) {
 888                 asus_proc_add(PROC_MLED, &proc_write_mled, &proc_read_mled, mode, device);
 889         }
 890
 891         if (hotk->methods->mt_tled) {
 892                 asus_proc_add(PROC_TLED, &proc_write_tled, &proc_read_tled, mode, device);
 893         }
 894
 895         /*
 896          * We need both read node and write method as LCD switch is also accessible
 897          * from keyboard
 898          */
 899         if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status) {
 900                 asus_proc_add(PROC_LCD, &proc_write_lcd, &proc_read_lcd, mode, device);
 901         }
 902
 903         if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
 904             (hotk->methods->brightness_get && hotk->methods->brightness_set)) {
 905                 asus_proc_add(PROC_BRN, &proc_write_brn, &proc_read_brn, mode, device);
 906         }
 907
 908         if (hotk->methods->display_set) {
 909                 asus_proc_add(PROC_DISP, &proc_write_disp, &proc_read_disp, mode, device);
 910         }
 911
 912         return 0;
 913 }
 914
 915 static int asus_hotk_remove_fs(struct acpi_device* device)
 916 {
 917         if(acpi_device_dir(device)) {
 918                 remove_proc_entry(PROC_INFO,acpi_device_dir(device));
 919                 if (hotk->methods->mt_wled)
 920                         remove_proc_entry(PROC_WLED,acpi_device_dir(device));
 921                 if (hotk->methods->mt_mled)
 922                         remove_proc_entry(PROC_MLED,acpi_device_dir(device));
 923                 if (hotk->methods->mt_tled)
 924                         remove_proc_entry(PROC_TLED,acpi_device_dir(device));
 925                 if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status)
 926                         remove_proc_entry(PROC_LCD, acpi_device_dir(device));
 927                 if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
 928                     (hotk->methods->brightness_get && hotk->methods->brightness_set))
 929                         remove_proc_entry(PROC_BRN, acpi_device_dir(device));
 930                 if (hotk->methods->display_set)
 931                         remove_proc_entry(PROC_DISP, acpi_device_dir(device));
 932         }
 933         return 0;
 934 }
 935
 936
 937 static void asus_hotk_notify(acpi_handle handle, u32 event, void *data)
 938 {
 939         /* TODO Find a better way to handle events count.*/
 940         if (!hotk)
 941                 return;
 942
 943         if ((event & ~((u32) BR_UP)) < 16) {
 944                 hotk->brightness = (event & ~((u32) BR_UP));
 945         } else if ((event & ~((u32) BR_DOWN)) < 16 ) {
 946                 hotk->brightness = (event & ~((u32) BR_DOWN));
 947         }
 948
 949         acpi_bus_generate_event(hotk->device, event,
 950                                 hotk->event_count[event % 128]++);
 951
 952         return;
 953 }
 954
 955 /*
 956  * This function is used to initialize the hotk with right values. In this
 957  * method, we can make all the detection we want, and modify the hotk struct
 958  */
 959 static int __init asus_hotk_get_info(void)
 960 {
 961         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 962         struct acpi_buffer dsdt = { ACPI_ALLOCATE_BUFFER, NULL };
 963         union acpi_object *model = NULL;
 964         int bsts_result;
 965         acpi_status status;
 966
 967         /*
 968          * Get DSDT headers early enough to allow for differentiating between
 969          * models, but late enough to allow acpi_bus_register_driver() to fail
 970          * before doing anything ACPI-specific. Should we encounter a machine,
 971          * which needs special handling (i.e. its hotkey device has a different
 972          * HID), this bit will be moved. A global variable asus_info contains
 973          * the DSDT header.
 974          */
 975         status = acpi_get_table(ACPI_TABLE_DSDT, 1, &dsdt);
 976         if (ACPI_FAILURE(status))
 977                 printk(KERN_WARNING "  Couldn't get the DSDT table header\n");
 978         else
 979                 asus_info = (struct acpi_table_header *) dsdt.pointer;
 980
 981         /* We have to write 0 on init this far for all ASUS models */
 982         if (!write_acpi_int(hotk->handle, "INIT", 0, &buffer)) {
 983                 printk(KERN_ERR "  Hotkey initialization failed\n");
 984                 return -ENODEV;
 985         }
 986
 987         /* This needs to be called for some laptops to init properly */
 988         if (!read_acpi_int(hotk->handle, "BSTS", &bsts_result))
 989                 printk(KERN_WARNING "  Error calling BSTS\n");
 990         else if (bsts_result)
 991                 printk(KERN_NOTICE "  BSTS called, 0x%02x returned\n", bsts_result);
 992
 993         /* Samsung P30 has a device with a valid _HID whose INIT does not
 994          * return anything. Catch this one and any similar here */
 995         if (buffer.pointer == NULL) {
 996                 if (asus_info && /* Samsung P30 */
 997                     strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) {
 998                         hotk->model = P30;
 999                         printk(KERN_NOTICE "  Samsung P30 detected, supported\n");
1000                 } else {
1001                         hotk->model = M2E;
1002                         printk(KERN_WARNING "  no string returned by INIT\n");
1003                         printk(KERN_WARNING "  trying default values, supply "
1004                                "the developers with your DSDT\n");
1005                 }
1006                 hotk->methods = &model_conf[hotk->model];
1007                 return AE_OK;
1008         }
1009
1010         model = (union acpi_object *) buffer.pointer;
1011         if (model->type == ACPI_TYPE_STRING) {
1012                 printk(KERN_NOTICE "  %s model detected, ", model->string.pointer);
1013         }
1014
1015         hotk->model = END_MODEL;
1016         if (strncmp(model->string.pointer, "L3D", 3) == 0)
1017                 hotk->model = L3D;
1018         else if (strncmp(model->string.pointer, "L3H", 3) == 0 ||
1019                  strncmp(model->string.pointer, "L2E", 3) == 0)
1020                 hotk->model = L3H;
1021         else if (strncmp(model->string.pointer, "L3", 2) == 0 ||
1022                  strncmp(model->string.pointer, "L2B", 3) == 0)
1023                 hotk->model = L3C;
1024         else if (strncmp(model->string.pointer, "L8L", 3) == 0)
1025                 hotk->model = L8L;
1026         else if (strncmp(model->string.pointer, "L4R", 3) == 0)
1027                 hotk->model = L4R;
1028         else if (strncmp(model->string.pointer, "M6N", 3) == 0)
1029                 hotk->model = M6N;
1030         else if (strncmp(model->string.pointer, "M6R", 3) == 0)
1031                 hotk->model = M6R;
1032         else if (strncmp(model->string.pointer, "M2N", 3) == 0 ||
1033                  strncmp(model->string.pointer, "M3N", 3) == 0 ||
1034                  strncmp(model->string.pointer, "M5N", 3) == 0 ||
1035                  strncmp(model->string.pointer, "M6N", 3) == 0 ||
1036                  strncmp(model->string.pointer, "S1N", 3) == 0 ||
1037                  strncmp(model->string.pointer, "S5N", 3) == 0 ||
1038                  strncmp(model->string.pointer, "W1N", 3) == 0)
1039                 hotk->model = xxN;
1040         else if (strncmp(model->string.pointer, "M1", 2) == 0)
1041                 hotk->model = M1A;
1042         else if (strncmp(model->string.pointer, "M2", 2) == 0 ||
1043                  strncmp(model->string.pointer, "L4E", 3) == 0)
1044                 hotk->model = M2E;
1045         else if (strncmp(model->string.pointer, "L2", 2) == 0)
1046                 hotk->model = L2D;
1047         else if (strncmp(model->string.pointer, "L8", 2) == 0)
1048                 hotk->model = S1x;
1049         else if (strncmp(model->string.pointer, "D1", 2) == 0)
1050                 hotk->model = D1x;
1051         else if (strncmp(model->string.pointer, "A1", 2) == 0)
1052                 hotk->model = A1x;
1053         else if (strncmp(model->string.pointer, "A2", 2) == 0)
1054                 hotk->model = A2x;
1055         else if (strncmp(model->string.pointer, "J1", 2) == 0)
1056                 hotk->model = S2x;
1057         else if (strncmp(model->string.pointer, "L5", 2) == 0)
1058                 hotk->model = L5x;
1059
1060         if (hotk->model == END_MODEL) {
1061                 printk("unsupported, trying default values, supply the "
1062                        "developers with your DSDT\n");
1063                 hotk->model = M2E;
1064         } else {
1065                 printk("supported\n");
1066         }
1067
1068         hotk->methods = &model_conf[hotk->model];
1069
1070         /* Sort of per-model blacklist */
1071         if (strncmp(model->string.pointer, "L2B", 3) == 0)
1072                 hotk->methods->lcd_status = NULL;
1073         /* L2B is similar enough to L3C to use its settings, with this only
1074            exception */
1075         else if (strncmp(model->string.pointer, "S5N", 3) == 0 ||
1076                  strncmp(model->string.pointer, "M5N", 3) == 0)
1077                 hotk->methods->mt_mled = NULL;
1078         /* S5N and M5N have no MLED */
1079         else if (strncmp(model->string.pointer, "M2N", 3) == 0 ||
1080                  strncmp(model->string.pointer, "W1N", 3) == 0)
1081                 hotk->methods->mt_wled = "WLED";
1082         /* M2N and W1N have a usable WLED */
1083         else if (asus_info) {
1084                 if (strncmp(asus_info->oem_table_id, "L1", 2) == 0)
1085                         hotk->methods->mled_status = NULL;
1086         /* S1300A reports L84F, but L1400B too, account for that */
1087         }
1088
1089         acpi_os_free(model);
1090
1091         return AE_OK;
1092 }
1093
1094
1095 static int __init asus_hotk_check(void)
1096 {
1097         int result = 0;
1098
1099         result = acpi_bus_get_status(hotk->device);
1100         if (result)
1101                 return result;
1102
1103         if (hotk->device->status.present) {
1104                 result = asus_hotk_get_info();
1105         } else {
1106                 printk(KERN_ERR "  Hotkey device not present, aborting\n");
1107                 return -EINVAL;
1108         }
1109
1110         return result;
1111 }
1112
1113
1114 static int __init asus_hotk_add(struct acpi_device *device)
1115 {
1116         acpi_status status = AE_OK;
1117         int result;
1118
1119         if (!device)
1120                 return -EINVAL;
1121
1122         printk(KERN_NOTICE "Asus Laptop ACPI Extras version %s\n",
1123                ASUS_ACPI_VERSION);
1124
1125         hotk =
1126             (struct asus_hotk *) kmalloc(sizeof(struct asus_hotk), GFP_KERNEL);
1127         if (!hotk)
1128                 return -ENOMEM;
1129         memset(hotk, 0, sizeof(struct asus_hotk));
1130
1131         hotk->handle = device->handle;
1132         strcpy(acpi_device_name(device), ACPI_HOTK_DEVICE_NAME);
1133         strcpy(acpi_device_class(device), ACPI_HOTK_CLASS);
1134         acpi_driver_data(device) = hotk;
1135         hotk->device = device;
1136
1137
1138         result = asus_hotk_check();
1139         if (result)
1140                 goto end;
1141
1142         result = asus_hotk_add_fs(device);
1143         if (result)
1144                 goto end;
1145
1146         /*
1147          * We install the handler, it will receive the hotk in parameter, so, we
1148          * could add other data to the hotk struct
1149          */
1150         status = acpi_install_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1151                                              asus_hotk_notify, hotk);
1152         if (ACPI_FAILURE(status))
1153                 printk(KERN_ERR "  Error installing notify handler\n");
1154
1155         /* For laptops without GPLV: init the hotk->brightness value */
1156         if ((!hotk->methods->brightness_get) && (!hotk->methods->brightness_status) &&
1157             (hotk->methods->brightness_up && hotk->methods->brightness_down)) {
1158                 status = acpi_evaluate_object(NULL, hotk->methods->brightness_down,
1159                                               NULL, NULL);
1160                 if (ACPI_FAILURE(status))
1161                         printk(KERN_WARNING "  Error changing brightness\n");
1162                 else {
1163                         status = acpi_evaluate_object(NULL, hotk->methods->brightness_up,
1164                                                       NULL, NULL);
1165                         if (ACPI_FAILURE(status))
1166                                 printk(KERN_WARNING "  Strange, error changing"
1167                                        " brightness\n");
1168                 }
1169         }
1170
1171       end:
1172         if (result) {
1173                 kfree(hotk);
1174         }
1175
1176         return result;
1177 }
1178
1179
1180 static int asus_hotk_remove(struct acpi_device *device, int type)
1181 {
1182         acpi_status status = 0;
1183
1184         if (!device || !acpi_driver_data(device))
1185                 return -EINVAL;
1186
1187         status = acpi_remove_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1188                                             asus_hotk_notify);
1189         if (ACPI_FAILURE(status))
1190                 printk(KERN_ERR "Asus ACPI: Error removing notify handler\n");
1191
1192         asus_hotk_remove_fs(device);
1193
1194         kfree(hotk);
1195
1196         return 0;
1197 }
1198
1199
1200 static int __init asus_acpi_init(void)
1201 {
1202         int result;
1203
1204         if (acpi_disabled)
1205                 return -ENODEV;
1206
1207         if (!acpi_specific_hotkey_enabled){
1208                 printk(KERN_ERR "Using generic hotkey driver\n");
1209                 return -ENODEV;
1210         }
1211         asus_proc_dir = proc_mkdir(PROC_ASUS, acpi_root_dir);
1212         if (!asus_proc_dir) {
1213                 printk(KERN_ERR "Asus ACPI: Unable to create /proc entry\n");
1214                 return -ENODEV;
1215         }
1216         asus_proc_dir->owner = THIS_MODULE;
1217
1218         result = acpi_bus_register_driver(&asus_hotk_driver);
1219         if (result < 1) {
1220                 acpi_bus_unregister_driver(&asus_hotk_driver);
1221                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1222                 return -ENODEV;
1223         }
1224
1225         return 0;
1226 }
1227
1228
1229 static void __exit asus_acpi_exit(void)
1230 {
1231         acpi_bus_unregister_driver(&asus_hotk_driver);
1232         remove_proc_entry(PROC_ASUS, acpi_root_dir);
1233
1234         acpi_os_free(asus_info);
1235
1236         return;
1237 }
1238
1239 module_init(asus_acpi_init);
1240 module_exit(asus_acpi_exit);