drivers/platform/x86/asus_acpi.c

   1 /*
   2  *  asus_acpi.c - Asus Laptop ACPI Extras
   3  *
   4  *
   5  *  Copyright (C) 2002-2005 Julien Lerouge, 2003-2006 Karol Kozimor
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *
  22  *  The development page for this driver is located at
  23  *  http://sourceforge.net/projects/acpi4asus/
  24  *
  25  *  Credits:
  26  *  Pontus Fuchs   - Helper functions, cleanup
  27  *  Johann Wiesner - Small compile fixes
  28  *  John Belmonte  - ACPI code for Toshiba laptop was a good starting point.
  29  *  �ic Burghard  - LED display support for W1N
  30  *
  31  */
  32
  33 #include <linux/kernel.h>
  34 #include <linux/module.h>
  35 #include <linux/init.h>
  36 #include <linux/types.h>
  37 #include <linux/proc_fs.h>
  38 #include <linux/backlight.h>
  39 #include <acpi/acpi_drivers.h>
  40 #include <acpi/acpi_bus.h>
  41 #include <asm/uaccess.h>
  42
  43 #define ASUS_ACPI_VERSION "0.30"
  44
  45 #define PROC_ASUS       "asus"  /* The directory */
  46 #define PROC_MLED       "mled"
  47 #define PROC_WLED       "wled"
  48 #define PROC_TLED       "tled"
  49 #define PROC_BT         "bluetooth"
  50 #define PROC_LEDD       "ledd"
  51 #define PROC_INFO       "info"
  52 #define PROC_LCD        "lcd"
  53 #define PROC_BRN        "brn"
  54 #define PROC_DISP       "disp"
  55
  56 #define ACPI_HOTK_NAME          "Asus Laptop ACPI Extras Driver"
  57 #define ACPI_HOTK_CLASS         "hotkey"
  58 #define ACPI_HOTK_DEVICE_NAME   "Hotkey"
  59
  60 /*
  61  * Some events we use, same for all Asus
  62  */
  63 #define BR_UP       0x10
  64 #define BR_DOWN     0x20
  65
  66 /*
  67  * Flags for hotk status
  68  */
  69 #define MLED_ON     0x01        /* Mail LED */
  70 #define WLED_ON     0x02        /* Wireless LED */
  71 #define TLED_ON     0x04        /* Touchpad LED */
  72 #define BT_ON       0x08        /* Internal Bluetooth */
  73
  74 MODULE_AUTHOR("Julien Lerouge, Karol Kozimor");
  75 MODULE_DESCRIPTION(ACPI_HOTK_NAME);
  76 MODULE_LICENSE("GPL");
  77
  78 static uid_t asus_uid;
  79 static gid_t asus_gid;
  80 module_param(asus_uid, uint, 0);
  81 MODULE_PARM_DESC(asus_uid, "UID for entries in /proc/acpi/asus");
  82 module_param(asus_gid, uint, 0);
  83 MODULE_PARM_DESC(asus_gid, "GID for entries in /proc/acpi/asus");
  84
  85 /* For each model, all features implemented,
  86  * those marked with R are relative to HOTK, A for absolute */
  87 struct model_data {
  88         char *name;             /* name of the laptop________________A */
  89         char *mt_mled;          /* method to handle mled_____________R */
  90         char *mled_status;      /* node to handle mled reading_______A */
  91         char *mt_wled;          /* method to handle wled_____________R */
  92         char *wled_status;      /* node to handle wled reading_______A */
  93         char *mt_tled;          /* method to handle tled_____________R */
  94         char *tled_status;      /* node to handle tled reading_______A */
  95         char *mt_ledd;          /* method to handle LED display______R */
  96         char *mt_bt_switch;     /* method to switch Bluetooth on/off_R */
  97         char *bt_status;        /* no model currently supports this__? */
  98         char *mt_lcd_switch;    /* method to turn LCD on/off_________A */
  99         char *lcd_status;       /* node to read LCD panel state______A */
 100         char *brightness_up;    /* method to set brightness up_______A */
 101         char *brightness_down;  /* method to set brightness down ____A */
 102         char *brightness_set;   /* method to set absolute brightness_R */
 103         char *brightness_get;   /* method to get absolute brightness_R */
 104         char *brightness_status;/* node to get brightness____________A */
 105         char *display_set;      /* method to set video output________R */
 106         char *display_get;      /* method to get video output________R */
 107 };
 108
 109 /*
 110  * This is the main structure, we can use it to store anything interesting
 111  * about the hotk device
 112  */
 113 struct asus_hotk {
 114         struct acpi_device *device;     /* the device we are in */
 115         acpi_handle handle;             /* the handle of the hotk device */
 116         char status;                    /* status of the hotk, for LEDs */
 117         u32 ledd_status;                /* status of the LED display */
 118         struct model_data *methods;     /* methods available on the laptop */
 119         u8 brightness;                  /* brightness level */
 120         enum {
 121                 A1x = 0,        /* A1340D, A1300F */
 122                 A2x,            /* A2500H */
 123                 A4G,            /* A4700G */
 124                 D1x,            /* D1 */
 125                 L2D,            /* L2000D */
 126                 L3C,            /* L3800C */
 127                 L3D,            /* L3400D */
 128                 L3H,            /* L3H, L2000E, L5D */
 129                 L4R,            /* L4500R */
 130                 L5x,            /* L5800C */
 131                 L8L,            /* L8400L */
 132                 M1A,            /* M1300A */
 133                 M2E,            /* M2400E, L4400L */
 134                 M6N,            /* M6800N, W3400N */
 135                 M6R,            /* M6700R, A3000G */
 136                 P30,            /* Samsung P30 */
 137                 S1x,            /* S1300A, but also L1400B and M2400A (L84F) */
 138                 S2x,            /* S200 (J1 reported), Victor MP-XP7210 */
 139                 W1N,            /* W1000N */
 140                 W5A,            /* W5A */
 141                 W3V,            /* W3030V */
 142                 xxN,            /* M2400N, M3700N, M5200N, M6800N,
 143                                                          S1300N, S5200N*/
 144                 A4S,            /* Z81sp */
 145                 F3Sa,           /* (Centrino) */
 146                 R1F,
 147                 END_MODEL
 148         } model;                /* Models currently supported */
 149         u16 event_count[128];   /* Count for each event TODO make this better */
 150 };
 151
 152 /* Here we go */
 153 #define A1x_PREFIX "\\_SB.PCI0.ISA.EC0."
 154 #define L3C_PREFIX "\\_SB.PCI0.PX40.ECD0."
 155 #define M1A_PREFIX "\\_SB.PCI0.PX40.EC0."
 156 #define P30_PREFIX "\\_SB.PCI0.LPCB.EC0."
 157 #define S1x_PREFIX "\\_SB.PCI0.PX40."
 158 #define S2x_PREFIX A1x_PREFIX
 159 #define xxN_PREFIX "\\_SB.PCI0.SBRG.EC0."
 160
 161 static struct model_data model_conf[END_MODEL] = {
 162         /*
 163          * TODO I have seen a SWBX and AIBX method on some models, like L1400B,
 164          * it seems to be a kind of switch, but what for ?
 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          .name = "A2x",
 178          .mt_mled = "MLED",
 179          .mt_wled = "WLED",
 180          .wled_status = "\\SG66",
 181          .mt_lcd_switch = "\\Q10",
 182          .lcd_status = "\\BAOF",
 183          .brightness_set = "SPLV",
 184          .brightness_get = "GPLV",
 185          .display_set = "SDSP",
 186          .display_get = "\\INFB"},
 187
 188         {
 189          .name = "A4G",
 190          .mt_mled = "MLED",
 191 /* WLED present, but not controlled by ACPI */
 192          .mt_lcd_switch = xxN_PREFIX "_Q10",
 193          .brightness_set = "SPLV",
 194          .brightness_get = "GPLV",
 195          .display_set = "SDSP",
 196          .display_get = "\\ADVG"},
 197
 198         {
 199          .name = "D1x",
 200          .mt_mled = "MLED",
 201          .mt_lcd_switch = "\\Q0D",
 202          .lcd_status = "\\GP11",
 203          .brightness_up = "\\Q0C",
 204          .brightness_down = "\\Q0B",
 205          .brightness_status = "\\BLVL",
 206          .display_set = "SDSP",
 207          .display_get = "\\INFB"},
 208
 209         {
 210          .name = "L2D",
 211          .mt_mled = "MLED",
 212          .mled_status = "\\SGP6",
 213          .mt_wled = "WLED",
 214          .wled_status = "\\RCP3",
 215          .mt_lcd_switch = "\\Q10",
 216          .lcd_status = "\\SGP0",
 217          .brightness_up = "\\Q0E",
 218          .brightness_down = "\\Q0F",
 219          .display_set = "SDSP",
 220          .display_get = "\\INFB"},
 221
 222         {
 223          .name = "L3C",
 224          .mt_mled = "MLED",
 225          .mt_wled = "WLED",
 226          .mt_lcd_switch = L3C_PREFIX "_Q10",
 227          .lcd_status = "\\GL32",
 228          .brightness_set = "SPLV",
 229          .brightness_get = "GPLV",
 230          .display_set = "SDSP",
 231          .display_get = "\\_SB.PCI0.PCI1.VGAC.NMAP"},
 232
 233         {
 234          .name = "L3D",
 235          .mt_mled = "MLED",
 236          .mled_status = "\\MALD",
 237          .mt_wled = "WLED",
 238          .mt_lcd_switch = "\\Q10",
 239          .lcd_status = "\\BKLG",
 240          .brightness_set = "SPLV",
 241          .brightness_get = "GPLV",
 242          .display_set = "SDSP",
 243          .display_get = "\\INFB"},
 244
 245         {
 246          .name = "L3H",
 247          .mt_mled = "MLED",
 248          .mt_wled = "WLED",
 249          .mt_lcd_switch = "EHK",
 250          .lcd_status = "\\_SB.PCI0.PM.PBC",
 251          .brightness_set = "SPLV",
 252          .brightness_get = "GPLV",
 253          .display_set = "SDSP",
 254          .display_get = "\\INFB"},
 255
 256         {
 257          .name = "L4R",
 258          .mt_mled = "MLED",
 259          .mt_wled = "WLED",
 260          .wled_status = "\\_SB.PCI0.SBRG.SG13",
 261          .mt_lcd_switch = xxN_PREFIX "_Q10",
 262          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
 263          .brightness_set = "SPLV",
 264          .brightness_get = "GPLV",
 265          .display_set = "SDSP",
 266          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
 267
 268         {
 269          .name = "L5x",
 270          .mt_mled = "MLED",
 271 /* WLED present, but not controlled by ACPI */
 272          .mt_tled = "TLED",
 273          .mt_lcd_switch = "\\Q0D",
 274          .lcd_status = "\\BAOF",
 275          .brightness_set = "SPLV",
 276          .brightness_get = "GPLV",
 277          .display_set = "SDSP",
 278          .display_get = "\\INFB"},
 279
 280         {
 281          .name = "L8L"
 282 /* No features, but at least support the hotkeys */
 283          },
 284
 285         {
 286          .name = "M1A",
 287          .mt_mled = "MLED",
 288          .mt_lcd_switch = M1A_PREFIX "Q10",
 289          .lcd_status = "\\PNOF",
 290          .brightness_up = M1A_PREFIX "Q0E",
 291          .brightness_down = M1A_PREFIX "Q0F",
 292          .brightness_status = "\\BRIT",
 293          .display_set = "SDSP",
 294          .display_get = "\\INFB"},
 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          .name = "M6N",
 309          .mt_mled = "MLED",
 310          .mt_wled = "WLED",
 311          .wled_status = "\\_SB.PCI0.SBRG.SG13",
 312          .mt_lcd_switch = xxN_PREFIX "_Q10",
 313          .lcd_status = "\\_SB.BKLT",
 314          .brightness_set = "SPLV",
 315          .brightness_get = "GPLV",
 316          .display_set = "SDSP",
 317          .display_get = "\\SSTE"},
 318
 319         {
 320          .name = "M6R",
 321          .mt_mled = "MLED",
 322          .mt_wled = "WLED",
 323          .mt_lcd_switch = xxN_PREFIX "_Q10",
 324          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
 325          .brightness_set = "SPLV",
 326          .brightness_get = "GPLV",
 327          .display_set = "SDSP",
 328          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
 329
 330         {
 331          .name = "P30",
 332          .mt_wled = "WLED",
 333          .mt_lcd_switch = P30_PREFIX "_Q0E",
 334          .lcd_status = "\\BKLT",
 335          .brightness_up = P30_PREFIX "_Q68",
 336          .brightness_down = P30_PREFIX "_Q69",
 337          .brightness_get = "GPLV",
 338          .display_set = "SDSP",
 339          .display_get = "\\DNXT"},
 340
 341         {
 342          .name = "S1x",
 343          .mt_mled = "MLED",
 344          .mled_status = "\\EMLE",
 345          .mt_wled = "WLED",
 346          .mt_lcd_switch = S1x_PREFIX "Q10",
 347          .lcd_status = "\\PNOF",
 348          .brightness_set = "SPLV",
 349          .brightness_get = "GPLV"},
 350
 351         {
 352          .name = "S2x",
 353          .mt_mled = "MLED",
 354          .mled_status = "\\MAIL",
 355          .mt_lcd_switch = S2x_PREFIX "_Q10",
 356          .lcd_status = "\\BKLI",
 357          .brightness_up = S2x_PREFIX "_Q0B",
 358          .brightness_down = S2x_PREFIX "_Q0A"},
 359
 360         {
 361          .name = "W1N",
 362          .mt_mled = "MLED",
 363          .mt_wled = "WLED",
 364          .mt_ledd = "SLCM",
 365          .mt_lcd_switch = xxN_PREFIX "_Q10",
 366          .lcd_status = "\\BKLT",
 367          .brightness_set = "SPLV",
 368          .brightness_get = "GPLV",
 369          .display_set = "SDSP",
 370          .display_get = "\\ADVG"},
 371
 372         {
 373          .name = "W5A",
 374          .mt_bt_switch = "BLED",
 375          .mt_wled = "WLED",
 376          .mt_lcd_switch = xxN_PREFIX "_Q10",
 377          .brightness_set = "SPLV",
 378          .brightness_get = "GPLV",
 379          .display_set = "SDSP",
 380          .display_get = "\\ADVG"},
 381
 382         {
 383          .name = "W3V",
 384          .mt_mled = "MLED",
 385          .mt_wled = "WLED",
 386          .mt_lcd_switch = xxN_PREFIX "_Q10",
 387          .lcd_status = "\\BKLT",
 388          .brightness_set = "SPLV",
 389          .brightness_get = "GPLV",
 390          .display_set = "SDSP",
 391          .display_get = "\\INFB"},
 392
 393        {
 394          .name = "xxN",
 395          .mt_mled = "MLED",
 396 /* WLED present, but not controlled by ACPI */
 397          .mt_lcd_switch = xxN_PREFIX "_Q10",
 398          .lcd_status = "\\BKLT",
 399          .brightness_set = "SPLV",
 400          .brightness_get = "GPLV",
 401          .display_set = "SDSP",
 402         .display_get = "\\ADVG"},
 403
 404         {
 405                 .name              = "A4S",
 406                 .brightness_set    = "SPLV",
 407                 .brightness_get    = "GPLV",
 408                 .mt_bt_switch      = "BLED",
 409                 .mt_wled           = "WLED"
 410         },
 411
 412         {
 413                 .name           = "F3Sa",
 414                 .mt_bt_switch   = "BLED",
 415                 .mt_wled        = "WLED",
 416                 .mt_mled        = "MLED",
 417                 .brightness_get = "GPLV",
 418                 .brightness_set = "SPLV",
 419                 .mt_lcd_switch  = "\\_SB.PCI0.SBRG.EC0._Q10",
 420                 .lcd_status     = "\\_SB.PCI0.SBRG.EC0.RPIN",
 421                 .display_get    = "\\ADVG",
 422                 .display_set    = "SDSP",
 423         },
 424         {
 425                 .name = "R1F",
 426                 .mt_bt_switch = "BLED",
 427                 .mt_mled = "MLED",
 428                 .mt_wled = "WLED",
 429                 .mt_lcd_switch = "\\Q10",
 430                 .lcd_status = "\\GP06",
 431                 .brightness_set = "SPLV",
 432                 .brightness_get = "GPLV",
 433                 .display_set = "SDSP",
 434                 .display_get = "\\INFB"
 435         }
 436 };
 437
 438 /* procdir we use */
 439 static struct proc_dir_entry *asus_proc_dir;
 440
 441 static struct backlight_device *asus_backlight_device;
 442
 443 /*
 444  * This header is made available to allow proper configuration given model,
 445  * revision number , ... this info cannot go in struct asus_hotk because it is
 446  * available before the hotk
 447  */
 448 static struct acpi_table_header *asus_info;
 449
 450 /* The actual device the driver binds to */
 451 static struct asus_hotk *hotk;
 452
 453 /*
 454  * The hotkey driver and autoloading declaration
 455  */
 456 static int asus_hotk_add(struct acpi_device *device);
 457 static int asus_hotk_remove(struct acpi_device *device, int type);
 458 static void asus_hotk_notify(struct acpi_device *device, u32 event);
 459
 460 static const struct acpi_device_id asus_device_ids[] = {
 461         {"ATK0100", 0},
 462         {"", 0},
 463 };
 464 MODULE_DEVICE_TABLE(acpi, asus_device_ids);
 465
 466 static struct acpi_driver asus_hotk_driver = {
 467         .name = "asus_acpi",
 468         .class = ACPI_HOTK_CLASS,
 469         .ids = asus_device_ids,
 470         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
 471         .ops = {
 472                 .add = asus_hotk_add,
 473                 .remove = asus_hotk_remove,
 474                 .notify = asus_hotk_notify,
 475                 },
 476 };
 477
 478 /*
 479  * This function evaluates an ACPI method, given an int as parameter, the
 480  * method is searched within the scope of the handle, can be NULL. The output
 481  * of the method is written is output, which can also be NULL
 482  *
 483  * returns 1 if write is successful, 0 else.
 484  */
 485 static int write_acpi_int(acpi_handle handle, const char *method, int val,
 486                           struct acpi_buffer *output)
 487 {
 488         struct acpi_object_list params; /* list of input parameters (int) */
 489         union acpi_object in_obj;       /* the only param we use */
 490         acpi_status status;
 491
 492         params.count = 1;
 493         params.pointer = &in_obj;
 494         in_obj.type = ACPI_TYPE_INTEGER;
 495         in_obj.integer.value = val;
 496
 497         status = acpi_evaluate_object(handle, (char *)method, &params, output);
 498         return (status == AE_OK);
 499 }
 500
 501 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
 502 {
 503         struct acpi_buffer output;
 504         union acpi_object out_obj;
 505         acpi_status status;
 506
 507         output.length = sizeof(out_obj);
 508         output.pointer = &out_obj;
 509
 510         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
 511         *val = out_obj.integer.value;
 512         return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
 513 }
 514
 515 /*
 516  * We write our info in page, we begin at offset off and cannot write more
 517  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 518  * number of bytes written in page
 519  */
 520 static int
 521 proc_read_info(char *page, char **start, off_t off, int count, int *eof,
 522                void *data)
 523 {
 524         int len = 0;
 525         int temp;
 526         char buf[16];           /* enough for all info */
 527         /*
 528          * We use the easy way, we don't care of off and count,
 529          * so we don't set eof to 1
 530          */
 531
 532         len += sprintf(page, ACPI_HOTK_NAME " " ASUS_ACPI_VERSION "\n");
 533         len += sprintf(page + len, "Model reference    : %s\n",
 534                        hotk->methods->name);
 535         /*
 536          * The SFUN method probably allows the original driver to get the list
 537          * of features supported by a given model. For now, 0x0100 or 0x0800
 538          * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
 539          * The significance of others is yet to be found.
 540          */
 541         if (read_acpi_int(hotk->handle, "SFUN", &temp))
 542                 len +=
 543                     sprintf(page + len, "SFUN value         : 0x%04x\n", temp);
 544         /*
 545          * Another value for userspace: the ASYM method returns 0x02 for
 546          * battery low and 0x04 for battery critical, its readings tend to be
 547          * more accurate than those provided by _BST.
 548          * Note: since not all the laptops provide this method, errors are
 549          * silently ignored.
 550          */
 551         if (read_acpi_int(hotk->handle, "ASYM", &temp))
 552                 len +=
 553                     sprintf(page + len, "ASYM value         : 0x%04x\n", temp);
 554         if (asus_info) {
 555                 snprintf(buf, 16, "%d", asus_info->length);
 556                 len += sprintf(page + len, "DSDT length        : %s\n", buf);
 557                 snprintf(buf, 16, "%d", asus_info->checksum);
 558                 len += sprintf(page + len, "DSDT checksum      : %s\n", buf);
 559                 snprintf(buf, 16, "%d", asus_info->revision);
 560                 len += sprintf(page + len, "DSDT revision      : %s\n", buf);
 561                 snprintf(buf, 7, "%s", asus_info->oem_id);
 562                 len += sprintf(page + len, "OEM id             : %s\n", buf);
 563                 snprintf(buf, 9, "%s", asus_info->oem_table_id);
 564                 len += sprintf(page + len, "OEM table id       : %s\n", buf);
 565                 snprintf(buf, 16, "%x", asus_info->oem_revision);
 566                 len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);
 567                 snprintf(buf, 5, "%s", asus_info->asl_compiler_id);
 568                 len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
 569                 snprintf(buf, 16, "%x", asus_info->asl_compiler_revision);
 570                 len += sprintf(page + len, "ASL comp revision  : 0x%s\n", buf);
 571         }
 572
 573         return len;
 574 }
 575
 576 /*
 577  * /proc handlers
 578  * We write our info in page, we begin at offset off and cannot write more
 579  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 580  * number of bytes written in page
 581  */
 582
 583 /* Generic LED functions */
 584 static int read_led(const char *ledname, int ledmask)
 585 {
 586         if (ledname) {
 587                 int led_status;
 588
 589                 if (read_acpi_int(NULL, ledname, &led_status))
 590                         return led_status;
 591                 else
 592                         printk(KERN_WARNING "Asus ACPI: Error reading LED "
 593                                "status\n");
 594         }
 595         return (hotk->status & ledmask) ? 1 : 0;
 596 }
 597
 598 static int parse_arg(const char __user *buf, unsigned long count, int *val)
 599 {
 600         char s[32];
 601         if (!count)
 602                 return 0;
 603         if (count > 31)
 604                 return -EINVAL;
 605         if (copy_from_user(s, buf, count))
 606                 return -EFAULT;
 607         s[count] = 0;
 608         if (sscanf(s, "%i", val) != 1)
 609                 return -EINVAL;
 610         return count;
 611 }
 612
 613 /* FIXME: kill extraneous args so it can be called independently */
 614 static int
 615 write_led(const char __user *buffer, unsigned long count,
 616           char *ledname, int ledmask, int invert)
 617 {
 618         int rv, value;
 619         int led_out = 0;
 620
 621         rv = parse_arg(buffer, count, &value);
 622         if (rv > 0)
 623                 led_out = value ? 1 : 0;
 624
 625         hotk->status =
 626             (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);
 627
 628         if (invert)             /* invert target value */
 629                 led_out = !led_out;
 630
 631         if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
 632                 printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",
 633                        ledname);
 634
 635         return rv;
 636 }
 637
 638 /*
 639  * Proc handlers for MLED
 640  */
 641 static int
 642 proc_read_mled(char *page, char **start, off_t off, int count, int *eof,
 643                void *data)
 644 {
 645         return sprintf(page, "%d\n",
 646                        read_led(hotk->methods->mled_status, MLED_ON));
 647 }
 648
 649 static int
 650 proc_write_mled(struct file *file, const char __user *buffer,
 651                 unsigned long count, void *data)
 652 {
 653         return write_led(buffer, count, hotk->methods->mt_mled, MLED_ON, 1);
 654 }
 655
 656 /*
 657  * Proc handlers for LED display
 658  */
 659 static int
 660 proc_read_ledd(char *page, char **start, off_t off, int count, int *eof,
 661                void *data)
 662 {
 663         return sprintf(page, "0x%08x\n", hotk->ledd_status);
 664 }
 665
 666 static int
 667 proc_write_ledd(struct file *file, const char __user *buffer,
 668                 unsigned long count, void *data)
 669 {
 670         int rv, value;
 671
 672         rv = parse_arg(buffer, count, &value);
 673         if (rv > 0) {
 674                 if (!write_acpi_int
 675                     (hotk->handle, hotk->methods->mt_ledd, value, NULL))
 676                         printk(KERN_WARNING
 677                                "Asus ACPI: LED display write failed\n");
 678                 else
 679                         hotk->ledd_status = (u32) value;
 680         }
 681         return rv;
 682 }
 683
 684 /*
 685  * Proc handlers for WLED
 686  */
 687 static int
 688 proc_read_wled(char *page, char **start, off_t off, int count, int *eof,
 689                void *data)
 690 {
 691         return sprintf(page, "%d\n",
 692                        read_led(hotk->methods->wled_status, WLED_ON));
 693 }
 694
 695 static int
 696 proc_write_wled(struct file *file, const char __user *buffer,
 697                 unsigned long count, void *data)
 698 {
 699         return write_led(buffer, count, hotk->methods->mt_wled, WLED_ON, 0);
 700 }
 701
 702 /*
 703  * Proc handlers for Bluetooth
 704  */
 705 static int
 706 proc_read_bluetooth(char *page, char **start, off_t off, int count, int *eof,
 707                     void *data)
 708 {
 709         return sprintf(page, "%d\n", read_led(hotk->methods->bt_status, BT_ON));
 710 }
 711
 712 static int
 713 proc_write_bluetooth(struct file *file, const char __user *buffer,
 714                      unsigned long count, void *data)
 715 {
 716         /* Note: mt_bt_switch controls both internal Bluetooth adapter's
 717            presence and its LED */
 718         return write_led(buffer, count, hotk->methods->mt_bt_switch, BT_ON, 0);
 719 }
 720
 721 /*
 722  * Proc handlers for TLED
 723  */
 724 static int
 725 proc_read_tled(char *page, char **start, off_t off, int count, int *eof,
 726                void *data)
 727 {
 728         return sprintf(page, "%d\n",
 729                        read_led(hotk->methods->tled_status, TLED_ON));
 730 }
 731
 732 static int
 733 proc_write_tled(struct file *file, const char __user *buffer,
 734                 unsigned long count, void *data)
 735 {
 736         return write_led(buffer, count, hotk->methods->mt_tled, TLED_ON, 0);
 737 }
 738
 739 static int get_lcd_state(void)
 740 {
 741         int lcd = 0;
 742
 743         if (hotk->model == L3H) {
 744                 /* L3H and the like have to be handled differently */
 745                 acpi_status status = 0;
 746                 struct acpi_object_list input;
 747                 union acpi_object mt_params[2];
 748                 struct acpi_buffer output;
 749                 union acpi_object out_obj;
 750
 751                 input.count = 2;
 752                 input.pointer = mt_params;
 753                 /* Note: the following values are partly guessed up, but
 754                    otherwise they seem to work */
 755                 mt_params[0].type = ACPI_TYPE_INTEGER;
 756                 mt_params[0].integer.value = 0x02;
 757                 mt_params[1].type = ACPI_TYPE_INTEGER;
 758                 mt_params[1].integer.value = 0x02;
 759
 760                 output.length = sizeof(out_obj);
 761                 output.pointer = &out_obj;
 762
 763                 status =
 764                     acpi_evaluate_object(NULL, hotk->methods->lcd_status,
 765                                          &input, &output);
 766                 if (status != AE_OK)
 767                         return -1;
 768                 if (out_obj.type == ACPI_TYPE_INTEGER)
 769                         /* That's what the AML code does */
 770                         lcd = out_obj.integer.value >> 8;
 771         } else if (hotk->model == F3Sa) {
 772                 unsigned long long tmp;
 773                 union acpi_object param;
 774                 struct acpi_object_list input;
 775                 acpi_status status;
 776
 777                 /* Read pin 11 */
 778                 param.type = ACPI_TYPE_INTEGER;
 779                 param.integer.value = 0x11;
 780                 input.count = 1;
 781                 input.pointer = &param;
 782
 783                 status = acpi_evaluate_integer(NULL, hotk->methods->lcd_status,
 784                                                 &input, &tmp);
 785                 if (status != AE_OK)
 786                         return -1;
 787
 788                 lcd = tmp;
 789         } else {
 790                 /* We don't have to check anything if we are here */
 791                 if (!read_acpi_int(NULL, hotk->methods->lcd_status, &lcd))
 792                         printk(KERN_WARNING
 793                                "Asus ACPI: Error reading LCD status\n");
 794
 795                 if (hotk->model == L2D)
 796                         lcd = ~lcd;
 797         }
 798
 799         return (lcd & 1);
 800 }
 801
 802 static int set_lcd_state(int value)
 803 {
 804         int lcd = 0;
 805         acpi_status status = 0;
 806
 807         lcd = value ? 1 : 0;
 808         if (lcd != get_lcd_state()) {
 809                 /* switch */
 810                 if (hotk->model != L3H) {
 811                         status =
 812                             acpi_evaluate_object(NULL,
 813                                                  hotk->methods->mt_lcd_switch,
 814                                                  NULL, NULL);
 815                 } else {
 816                         /* L3H and the like must be handled differently */
 817                         if (!write_acpi_int
 818                             (hotk->handle, hotk->methods->mt_lcd_switch, 0x07,
 819                              NULL))
 820                                 status = AE_ERROR;
 821                         /* L3H's AML executes EHK (0x07) upon Fn+F7 keypress,
 822                            the exact behaviour is simulated here */
 823                 }
 824                 if (ACPI_FAILURE(status))
 825                         printk(KERN_WARNING "Asus ACPI: Error switching LCD\n");
 826         }
 827         return 0;
 828
 829 }
 830
 831 static int
 832 proc_read_lcd(char *page, char **start, off_t off, int count, int *eof,
 833               void *data)
 834 {
 835         return sprintf(page, "%d\n", get_lcd_state());
 836 }
 837
 838 static int
 839 proc_write_lcd(struct file *file, const char __user *buffer,
 840                unsigned long count, void *data)
 841 {
 842         int rv, value;
 843
 844         rv = parse_arg(buffer, count, &value);
 845         if (rv > 0)
 846                 set_lcd_state(value);
 847         return rv;
 848 }
 849
 850 static int read_brightness(struct backlight_device *bd)
 851 {
 852         int value;
 853
 854         if (hotk->methods->brightness_get) {    /* SPLV/GPLV laptop */
 855                 if (!read_acpi_int(hotk->handle, hotk->methods->brightness_get,
 856                                    &value))
 857                         printk(KERN_WARNING
 858                                "Asus ACPI: Error reading brightness\n");
 859         } else if (hotk->methods->brightness_status) {  /* For D1 for example */
 860                 if (!read_acpi_int(NULL, hotk->methods->brightness_status,
 861                                    &value))
 862                         printk(KERN_WARNING
 863                                "Asus ACPI: Error reading brightness\n");
 864         } else                  /* No GPLV method */
 865                 value = hotk->brightness;
 866         return value;
 867 }
 868
 869 /*
 870  * Change the brightness level
 871  */
 872 static int set_brightness(int value)
 873 {
 874         acpi_status status = 0;
 875         int ret = 0;
 876
 877         /* SPLV laptop */
 878         if (hotk->methods->brightness_set) {
 879                 if (!write_acpi_int(hotk->handle, hotk->methods->brightness_set,
 880                                     value, NULL))
 881                         printk(KERN_WARNING
 882                                "Asus ACPI: Error changing brightness\n");
 883                         ret = -EIO;
 884                 goto out;
 885         }
 886
 887         /* No SPLV method if we are here, act as appropriate */
 888         value -= read_brightness(NULL);
 889         while (value != 0) {
 890                 status = acpi_evaluate_object(NULL, (value > 0) ?
 891                                               hotk->methods->brightness_up :
 892                                               hotk->methods->brightness_down,
 893                                               NULL, NULL);
 894                 (value > 0) ? value-- : value++;
 895                 if (ACPI_FAILURE(status))
 896                         printk(KERN_WARNING
 897                                "Asus ACPI: Error changing brightness\n");
 898                         ret = -EIO;
 899         }
 900 out:
 901         return ret;
 902 }
 903
 904 static int set_brightness_status(struct backlight_device *bd)
 905 {
 906         return set_brightness(bd->props.brightness);
 907 }
 908
 909 static int
 910 proc_read_brn(char *page, char **start, off_t off, int count, int *eof,
 911               void *data)
 912 {
 913         return sprintf(page, "%d\n", read_brightness(NULL));
 914 }
 915
 916 static int
 917 proc_write_brn(struct file *file, const char __user *buffer,
 918                unsigned long count, void *data)
 919 {
 920         int rv, value;
 921
 922         rv = parse_arg(buffer, count, &value);
 923         if (rv > 0) {
 924                 value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
 925                 /* 0 <= value <= 15 */
 926                 set_brightness(value);
 927         }
 928         return rv;
 929 }
 930
 931 static void set_display(int value)
 932 {
 933         /* no sanity check needed for now */
 934         if (!write_acpi_int(hotk->handle, hotk->methods->display_set,
 935                             value, NULL))
 936                 printk(KERN_WARNING "Asus ACPI: Error setting display\n");
 937         return;
 938 }
 939
 940 /*
 941  * Now, *this* one could be more user-friendly, but so far, no-one has
 942  * complained. The significance of bits is the same as in proc_write_disp()
 943  */
 944 static int
 945 proc_read_disp(char *page, char **start, off_t off, int count, int *eof,
 946                void *data)
 947 {
 948         int value = 0;
 949
 950         if (!read_acpi_int(hotk->handle, hotk->methods->display_get, &value))
 951                 printk(KERN_WARNING
 952                        "Asus ACPI: Error reading display status\n");
 953         value &= 0x07;  /* needed for some models, shouldn't hurt others */
 954         return sprintf(page, "%d\n", value);
 955 }
 956
 957 /*
 958  * Experimental support for display switching. As of now: 1 should activate
 959  * the LCD output, 2 should do for CRT, and 4 for TV-Out. Any combination
 960  * (bitwise) of these will suffice. I never actually tested 3 displays hooked
 961  * up simultaneously, so be warned. See the acpi4asus README for more info.
 962  */
 963 static int
 964 proc_write_disp(struct file *file, const char __user *buffer,
 965                 unsigned long count, void *data)
 966 {
 967         int rv, value;
 968
 969         rv = parse_arg(buffer, count, &value);
 970         if (rv > 0)
 971                 set_display(value);
 972         return rv;
 973 }
 974
 975 typedef int (proc_readfunc) (char *page, char **start, off_t off, int count,
 976                              int *eof, void *data);
 977 typedef int (proc_writefunc) (struct file *file, const char __user *buffer,
 978                               unsigned long count, void *data);
 979
 980 static int
 981 asus_proc_add(char *name, proc_writefunc *writefunc,
 982                      proc_readfunc *readfunc, mode_t mode,
 983                      struct acpi_device *device)
 984 {
 985         struct proc_dir_entry *proc =
 986             create_proc_entry(name, mode, acpi_device_dir(device));
 987         if (!proc) {
 988                 printk(KERN_WARNING "  Unable to create %s fs entry\n", name);
 989                 return -1;
 990         }
 991         proc->write_proc = writefunc;
 992         proc->read_proc = readfunc;
 993         proc->data = acpi_driver_data(device);
 994         proc->uid = asus_uid;
 995         proc->gid = asus_gid;
 996         return 0;
 997 }
 998
 999 static int asus_hotk_add_fs(struct acpi_device *device)
1000 {
1001         struct proc_dir_entry *proc;
1002         mode_t mode;
1003
1004         /*
1005          * If parameter uid or gid is not changed, keep the default setting for
1006          * our proc entries (-rw-rw-rw-) else, it means we care about security,
1007          * and then set to -rw-rw----
1008          */
1009
1010         if ((asus_uid == 0) && (asus_gid == 0)) {
1011                 mode = S_IFREG | S_IRUGO | S_IWUGO;
1012         } else {
1013                 mode = S_IFREG | S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
1014                 printk(KERN_WARNING "  asus_uid and asus_gid parameters are "
1015                        "deprecated, use chown and chmod instead!\n");
1016         }
1017
1018         acpi_device_dir(device) = asus_proc_dir;
1019         if (!acpi_device_dir(device))
1020                 return -ENODEV;
1021
1022         proc = create_proc_entry(PROC_INFO, mode, acpi_device_dir(device));
1023         if (proc) {
1024                 proc->read_proc = proc_read_info;
1025                 proc->data = acpi_driver_data(device);
1026                 proc->uid = asus_uid;
1027                 proc->gid = asus_gid;
1028         } else {
1029                 printk(KERN_WARNING "  Unable to create " PROC_INFO
1030                        " fs entry\n");
1031         }
1032
1033         if (hotk->methods->mt_wled) {
1034                 asus_proc_add(PROC_WLED, &proc_write_wled, &proc_read_wled,
1035                               mode, device);
1036         }
1037
1038         if (hotk->methods->mt_ledd) {
1039                 asus_proc_add(PROC_LEDD, &proc_write_ledd, &proc_read_ledd,
1040                               mode, device);
1041         }
1042
1043         if (hotk->methods->mt_mled) {
1044                 asus_proc_add(PROC_MLED, &proc_write_mled, &proc_read_mled,
1045                               mode, device);
1046         }
1047
1048         if (hotk->methods->mt_tled) {
1049                 asus_proc_add(PROC_TLED, &proc_write_tled, &proc_read_tled,
1050                               mode, device);
1051         }
1052
1053         if (hotk->methods->mt_bt_switch) {
1054                 asus_proc_add(PROC_BT, &proc_write_bluetooth,
1055                               &proc_read_bluetooth, mode, device);
1056         }
1057
1058         /*
1059          * We need both read node and write method as LCD switch is also
1060          * accessible from the keyboard
1061          */
1062         if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status) {
1063                 asus_proc_add(PROC_LCD, &proc_write_lcd, &proc_read_lcd, mode,
1064                               device);
1065         }
1066
1067         if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
1068             (hotk->methods->brightness_get && hotk->methods->brightness_set)) {
1069                 asus_proc_add(PROC_BRN, &proc_write_brn, &proc_read_brn, mode,
1070                               device);
1071         }
1072
1073         if (hotk->methods->display_set) {
1074                 asus_proc_add(PROC_DISP, &proc_write_disp, &proc_read_disp,
1075                               mode, device);
1076         }
1077
1078         return 0;
1079 }
1080
1081 static int asus_hotk_remove_fs(struct acpi_device *device)
1082 {
1083         if (acpi_device_dir(device)) {
1084                 remove_proc_entry(PROC_INFO, acpi_device_dir(device));
1085                 if (hotk->methods->mt_wled)
1086                         remove_proc_entry(PROC_WLED, acpi_device_dir(device));
1087                 if (hotk->methods->mt_mled)
1088                         remove_proc_entry(PROC_MLED, acpi_device_dir(device));
1089                 if (hotk->methods->mt_tled)
1090                         remove_proc_entry(PROC_TLED, acpi_device_dir(device));
1091                 if (hotk->methods->mt_ledd)
1092                         remove_proc_entry(PROC_LEDD, acpi_device_dir(device));
1093                 if (hotk->methods->mt_bt_switch)
1094                         remove_proc_entry(PROC_BT, acpi_device_dir(device));
1095                 if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status)
1096                         remove_proc_entry(PROC_LCD, acpi_device_dir(device));
1097                 if ((hotk->methods->brightness_up
1098                      && hotk->methods->brightness_down)
1099                     || (hotk->methods->brightness_get
1100                         && hotk->methods->brightness_set))
1101                         remove_proc_entry(PROC_BRN, acpi_device_dir(device));
1102                 if (hotk->methods->display_set)
1103                         remove_proc_entry(PROC_DISP, acpi_device_dir(device));
1104         }
1105         return 0;
1106 }
1107
1108 static void asus_hotk_notify(struct acpi_device *device, u32 event)
1109 {
1110         /* TODO Find a better way to handle events count. */
1111         if (!hotk)
1112                 return;
1113
1114         /*
1115          * The BIOS *should* be sending us device events, but apparently
1116          * Asus uses system events instead, so just ignore any device
1117          * events we get.
1118          */
1119         if (event > ACPI_MAX_SYS_NOTIFY)
1120                 return;
1121
1122         if ((event & ~((u32) BR_UP)) < 16)
1123                 hotk->brightness = (event & ~((u32) BR_UP));
1124         else if ((event & ~((u32) BR_DOWN)) < 16)
1125                 hotk->brightness = (event & ~((u32) BR_DOWN));
1126
1127         acpi_bus_generate_proc_event(hotk->device, event,
1128                                 hotk->event_count[event % 128]++);
1129
1130         return;
1131 }
1132
1133 /*
1134  * Match the model string to the list of supported models. Return END_MODEL if
1135  * no match or model is NULL.
1136  */
1137 static int asus_model_match(char *model)
1138 {
1139         if (model == NULL)
1140                 return END_MODEL;
1141
1142         if (strncmp(model, "L3D", 3) == 0)
1143                 return L3D;
1144         else if (strncmp(model, "L2E", 3) == 0 ||
1145                  strncmp(model, "L3H", 3) == 0 || strncmp(model, "L5D", 3) == 0)
1146                 return L3H;
1147         else if (strncmp(model, "L3", 2) == 0 || strncmp(model, "L2B", 3) == 0)
1148                 return L3C;
1149         else if (strncmp(model, "L8L", 3) == 0)
1150                 return L8L;
1151         else if (strncmp(model, "L4R", 3) == 0)
1152                 return L4R;
1153         else if (strncmp(model, "M6N", 3) == 0 || strncmp(model, "W3N", 3) == 0)
1154                 return M6N;
1155         else if (strncmp(model, "M6R", 3) == 0 || strncmp(model, "A3G", 3) == 0)
1156                 return M6R;
1157         else if (strncmp(model, "M2N", 3) == 0 ||
1158                  strncmp(model, "M3N", 3) == 0 ||
1159                  strncmp(model, "M5N", 3) == 0 ||
1160                  strncmp(model, "M6N", 3) == 0 ||
1161                  strncmp(model, "S1N", 3) == 0 ||
1162                  strncmp(model, "S5N", 3) == 0 || strncmp(model, "W1N", 3) == 0)
1163                 return xxN;
1164         else if (strncmp(model, "M1", 2) == 0)
1165                 return M1A;
1166         else if (strncmp(model, "M2", 2) == 0 || strncmp(model, "L4E", 3) == 0)
1167                 return M2E;
1168         else if (strncmp(model, "L2", 2) == 0)
1169                 return L2D;
1170         else if (strncmp(model, "L8", 2) == 0)
1171                 return S1x;
1172         else if (strncmp(model, "D1", 2) == 0)
1173                 return D1x;
1174         else if (strncmp(model, "A1", 2) == 0)
1175                 return A1x;
1176         else if (strncmp(model, "A2", 2) == 0)
1177                 return A2x;
1178         else if (strncmp(model, "J1", 2) == 0)
1179                 return S2x;
1180         else if (strncmp(model, "L5", 2) == 0)
1181                 return L5x;
1182         else if (strncmp(model, "A4G", 3) == 0)
1183                 return A4G;
1184         else if (strncmp(model, "W1N", 3) == 0)
1185                 return W1N;
1186         else if (strncmp(model, "W3V", 3) == 0)
1187                 return W3V;
1188         else if (strncmp(model, "W5A", 3) == 0)
1189                 return W5A;
1190         else if (strncmp(model, "R1F", 3) == 0)
1191                 return R1F;
1192         else if (strncmp(model, "A4S", 3) == 0)
1193                 return A4S;
1194         else if (strncmp(model, "F3Sa", 4) == 0)
1195                 return F3Sa;
1196         else
1197                 return END_MODEL;
1198 }
1199
1200 /*
1201  * This function is used to initialize the hotk with right values. In this
1202  * method, we can make all the detection we want, and modify the hotk struct
1203  */
1204 static int asus_hotk_get_info(void)
1205 {
1206         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1207         union acpi_object *model = NULL;
1208         int bsts_result;
1209         char *string = NULL;
1210         acpi_status status;
1211
1212         /*
1213          * Get DSDT headers early enough to allow for differentiating between
1214          * models, but late enough to allow acpi_bus_register_driver() to fail
1215          * before doing anything ACPI-specific. Should we encounter a machine,
1216          * which needs special handling (i.e. its hotkey device has a different
1217          * HID), this bit will be moved. A global variable asus_info contains
1218          * the DSDT header.
1219          */
1220         status = acpi_get_table(ACPI_SIG_DSDT, 1, &asus_info);
1221         if (ACPI_FAILURE(status))
1222                 printk(KERN_WARNING "  Couldn't get the DSDT table header\n");
1223
1224         /* We have to write 0 on init this far for all ASUS models */
1225         if (!write_acpi_int(hotk->handle, "INIT", 0, &buffer)) {
1226                 printk(KERN_ERR "  Hotkey initialization failed\n");
1227                 return -ENODEV;
1228         }
1229
1230         /* This needs to be called for some laptops to init properly */
1231         if (!read_acpi_int(hotk->handle, "BSTS", &bsts_result))
1232                 printk(KERN_WARNING "  Error calling BSTS\n");
1233         else if (bsts_result)
1234                 printk(KERN_NOTICE "  BSTS called, 0x%02x returned\n",
1235                        bsts_result);
1236
1237         /*
1238          * Try to match the object returned by INIT to the specific model.
1239          * Handle every possible object (or the lack of thereof) the DSDT
1240          * writers might throw at us. When in trouble, we pass NULL to
1241          * asus_model_match() and try something completely different.
1242          */
1243         if (buffer.pointer) {
1244                 model = buffer.pointer;
1245                 switch (model->type) {
1246                 case ACPI_TYPE_STRING:
1247                         string = model->string.pointer;
1248                         break;
1249                 case ACPI_TYPE_BUFFER:
1250                         string = model->buffer.pointer;
1251                         break;
1252                 default:
1253                         kfree(model);
1254                         model = NULL;
1255                         break;
1256                 }
1257         }
1258         hotk->model = asus_model_match(string);
1259         if (hotk->model == END_MODEL) { /* match failed */
1260                 if (asus_info &&
1261                     strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) {
1262                         hotk->model = P30;
1263                         printk(KERN_NOTICE
1264                                "  Samsung P30 detected, supported\n");
1265                 } else {
1266                         hotk->model = M2E;
1267                         printk(KERN_NOTICE "  unsupported model %s, trying "
1268                                "default values\n", string);
1269                         printk(KERN_NOTICE
1270                                "  send /proc/acpi/dsdt to the developers\n");
1271                         kfree(model);
1272                         return -ENODEV;
1273                 }
1274                 hotk->methods = &model_conf[hotk->model];
1275                 return AE_OK;
1276         }
1277         hotk->methods = &model_conf[hotk->model];
1278         printk(KERN_NOTICE "  %s model detected, supported\n", string);
1279
1280         /* Sort of per-model blacklist */
1281         if (strncmp(string, "L2B", 3) == 0)
1282                 hotk->methods->lcd_status = NULL;
1283         /* L2B is similar enough to L3C to use its settings, with this only
1284            exception */
1285         else if (strncmp(string, "A3G", 3) == 0)
1286                 hotk->methods->lcd_status = "\\BLFG";
1287         /* A3G is like M6R */
1288         else if (strncmp(string, "S5N", 3) == 0 ||
1289                  strncmp(string, "M5N", 3) == 0 ||
1290                  strncmp(string, "W3N", 3) == 0)
1291                 hotk->methods->mt_mled = NULL;
1292         /* S5N, M5N and W3N have no MLED */
1293         else if (strncmp(string, "L5D", 3) == 0)
1294                 hotk->methods->mt_wled = NULL;
1295         /* L5D's WLED is not controlled by ACPI */
1296         else if (strncmp(string, "M2N", 3) == 0 ||
1297                  strncmp(string, "W3V", 3) == 0 ||
1298                  strncmp(string, "S1N", 3) == 0)
1299                 hotk->methods->mt_wled = "WLED";
1300         /* M2N, S1N and W3V have a usable WLED */
1301         else if (asus_info) {
1302                 if (strncmp(asus_info->oem_table_id, "L1", 2) == 0)
1303                         hotk->methods->mled_status = NULL;
1304                 /* S1300A reports L84F, but L1400B too, account for that */
1305         }
1306
1307         kfree(model);
1308
1309         return AE_OK;
1310 }
1311
1312 static int asus_hotk_check(void)
1313 {
1314         int result = 0;
1315
1316         result = acpi_bus_get_status(hotk->device);
1317         if (result)
1318                 return result;
1319
1320         if (hotk->device->status.present) {
1321                 result = asus_hotk_get_info();
1322         } else {
1323                 printk(KERN_ERR "  Hotkey device not present, aborting\n");
1324                 return -EINVAL;
1325         }
1326
1327         return result;
1328 }
1329
1330 static int asus_hotk_found;
1331
1332 static int asus_hotk_add(struct acpi_device *device)
1333 {
1334         acpi_status status = AE_OK;
1335         int result;
1336
1337         if (!device)
1338                 return -EINVAL;
1339
1340         printk(KERN_NOTICE "Asus Laptop ACPI Extras version %s\n",
1341                ASUS_ACPI_VERSION);
1342
1343         hotk = kzalloc(sizeof(struct asus_hotk), GFP_KERNEL);
1344         if (!hotk)
1345                 return -ENOMEM;
1346
1347         hotk->handle = device->handle;
1348         strcpy(acpi_device_name(device), ACPI_HOTK_DEVICE_NAME);
1349         strcpy(acpi_device_class(device), ACPI_HOTK_CLASS);
1350         device->driver_data = hotk;
1351         hotk->device = device;
1352
1353         result = asus_hotk_check();
1354         if (result)
1355                 goto end;
1356
1357         result = asus_hotk_add_fs(device);
1358         if (result)
1359                 goto end;
1360
1361         /* For laptops without GPLV: init the hotk->brightness value */
1362         if ((!hotk->methods->brightness_get)
1363             && (!hotk->methods->brightness_status)
1364             && (hotk->methods->brightness_up && hotk->methods->brightness_down)) {
1365                 status =
1366                     acpi_evaluate_object(NULL, hotk->methods->brightness_down,
1367                                          NULL, NULL);
1368                 if (ACPI_FAILURE(status))
1369                         printk(KERN_WARNING "  Error changing brightness\n");
1370                 else {
1371                         status =
1372                             acpi_evaluate_object(NULL,
1373                                                  hotk->methods->brightness_up,
1374                                                  NULL, NULL);
1375                         if (ACPI_FAILURE(status))
1376                                 printk(KERN_WARNING "  Strange, error changing"
1377                                        " brightness\n");
1378                 }
1379         }
1380
1381         asus_hotk_found = 1;
1382
1383         /* LED display is off by default */
1384         hotk->ledd_status = 0xFFF;
1385
1386 end:
1387         if (result)
1388                 kfree(hotk);
1389
1390         return result;
1391 }
1392
1393 static int asus_hotk_remove(struct acpi_device *device, int type)
1394 {
1395         if (!device || !acpi_driver_data(device))
1396                 return -EINVAL;
1397
1398         asus_hotk_remove_fs(device);
1399
1400         kfree(hotk);
1401
1402         return 0;
1403 }
1404
1405 static struct backlight_ops asus_backlight_data = {
1406         .get_brightness = read_brightness,
1407         .update_status  = set_brightness_status,
1408 };
1409
1410 static void asus_acpi_exit(void)
1411 {
1412         if (asus_backlight_device)
1413                 backlight_device_unregister(asus_backlight_device);
1414
1415         acpi_bus_unregister_driver(&asus_hotk_driver);
1416         remove_proc_entry(PROC_ASUS, acpi_root_dir);
1417
1418         return;
1419 }
1420
1421 static int __init asus_acpi_init(void)
1422 {
1423         int result;
1424
1425         if (acpi_disabled)
1426                 return -ENODEV;
1427
1428         asus_proc_dir = proc_mkdir(PROC_ASUS, acpi_root_dir);
1429         if (!asus_proc_dir) {
1430                 printk(KERN_ERR "Asus ACPI: Unable to create /proc entry\n");
1431                 return -ENODEV;
1432         }
1433
1434         result = acpi_bus_register_driver(&asus_hotk_driver);
1435         if (result < 0) {
1436                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1437                 return result;
1438         }
1439
1440         /*
1441          * This is a bit of a kludge.  We only want this module loaded
1442          * for ASUS systems, but there's currently no way to probe the
1443          * ACPI namespace for ASUS HIDs.  So we just return failure if
1444          * we didn't find one, which will cause the module to be
1445          * unloaded.
1446          */
1447         if (!asus_hotk_found) {
1448                 acpi_bus_unregister_driver(&asus_hotk_driver);
1449                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1450                 return -ENODEV;
1451         }
1452
1453         asus_backlight_device = backlight_device_register("asus", NULL, NULL,
1454                                                           &asus_backlight_data);
1455         if (IS_ERR(asus_backlight_device)) {
1456                 printk(KERN_ERR "Could not register asus backlight device\n");
1457                 asus_backlight_device = NULL;
1458                 asus_acpi_exit();
1459                 return -ENODEV;
1460         }
1461         asus_backlight_device->props.max_brightness = 15;
1462
1463         return 0;
1464 }
1465
1466 module_init(asus_acpi_init);
1467 module_exit(asus_acpi_exit);