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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  34
  35 #include <linux/kernel.h>
  36 #include <linux/module.h>
  37 #include <linux/slab.h>
  38 #include <linux/init.h>
  39 #include <linux/types.h>
  40 #include <linux/proc_fs.h>
  41 #include <linux/seq_file.h>
  42 #include <linux/backlight.h>
  43 #include <acpi/acpi_drivers.h>
  44 #include <acpi/acpi_bus.h>
  45 #include <asm/uaccess.h>
  46
  47 #define ASUS_ACPI_VERSION "0.30"
  48
  49 #define PROC_ASUS       "asus"  /* The directory */
  50 #define PROC_MLED       "mled"
  51 #define PROC_WLED       "wled"
  52 #define PROC_TLED       "tled"
  53 #define PROC_BT         "bluetooth"
  54 #define PROC_LEDD       "ledd"
  55 #define PROC_INFO       "info"
  56 #define PROC_LCD        "lcd"
  57 #define PROC_BRN        "brn"
  58 #define PROC_DISP       "disp"
  59
  60 #define ACPI_HOTK_NAME          "Asus Laptop ACPI Extras Driver"
  61 #define ACPI_HOTK_CLASS         "hotkey"
  62 #define ACPI_HOTK_DEVICE_NAME   "Hotkey"
  63
  64 /*
  65  * Some events we use, same for all Asus
  66  */
  67 #define BR_UP       0x10
  68 #define BR_DOWN     0x20
  69
  70 /*
  71  * Flags for hotk status
  72  */
  73 #define MLED_ON     0x01        /* Mail LED */
  74 #define WLED_ON     0x02        /* Wireless LED */
  75 #define TLED_ON     0x04        /* Touchpad LED */
  76 #define BT_ON       0x08        /* Internal Bluetooth */
  77
  78 MODULE_AUTHOR("Julien Lerouge, Karol Kozimor");
  79 MODULE_DESCRIPTION(ACPI_HOTK_NAME);
  80 MODULE_LICENSE("GPL");
  81
  82 static uid_t asus_uid;
  83 static gid_t asus_gid;
  84 module_param(asus_uid, uint, 0);
  85 MODULE_PARM_DESC(asus_uid, "UID for entries in /proc/acpi/asus");
  86 module_param(asus_gid, uint, 0);
  87 MODULE_PARM_DESC(asus_gid, "GID for entries in /proc/acpi/asus");
  88
  89 /* For each model, all features implemented,
  90  * those marked with R are relative to HOTK, A for absolute */
  91 struct model_data {
  92         char *name;             /* name of the laptop________________A */
  93         char *mt_mled;          /* method to handle mled_____________R */
  94         char *mled_status;      /* node to handle mled reading_______A */
  95         char *mt_wled;          /* method to handle wled_____________R */
  96         char *wled_status;      /* node to handle wled reading_______A */
  97         char *mt_tled;          /* method to handle tled_____________R */
  98         char *tled_status;      /* node to handle tled reading_______A */
  99         char *mt_ledd;          /* method to handle LED display______R */
 100         char *mt_bt_switch;     /* method to switch Bluetooth on/off_R */
 101         char *bt_status;        /* no model currently supports this__? */
 102         char *mt_lcd_switch;    /* method to turn LCD on/off_________A */
 103         char *lcd_status;       /* node to read LCD panel state______A */
 104         char *brightness_up;    /* method to set brightness up_______A */
 105         char *brightness_down;  /* method to set brightness down ____A */
 106         char *brightness_set;   /* method to set absolute brightness_R */
 107         char *brightness_get;   /* method to get absolute brightness_R */
 108         char *brightness_status;/* node to get brightness____________A */
 109         char *display_set;      /* method to set video output________R */
 110         char *display_get;      /* method to get video output________R */
 111 };
 112
 113 /*
 114  * This is the main structure, we can use it to store anything interesting
 115  * about the hotk device
 116  */
 117 struct asus_hotk {
 118         struct acpi_device *device;     /* the device we are in */
 119         acpi_handle handle;             /* the handle of the hotk device */
 120         char status;                    /* status of the hotk, for LEDs */
 121         u32 ledd_status;                /* status of the LED display */
 122         struct model_data *methods;     /* methods available on the laptop */
 123         u8 brightness;                  /* brightness level */
 124         enum {
 125                 A1x = 0,        /* A1340D, A1300F */
 126                 A2x,            /* A2500H */
 127                 A4G,            /* A4700G */
 128                 D1x,            /* D1 */
 129                 L2D,            /* L2000D */
 130                 L3C,            /* L3800C */
 131                 L3D,            /* L3400D */
 132                 L3H,            /* L3H, L2000E, L5D */
 133                 L4R,            /* L4500R */
 134                 L5x,            /* L5800C */
 135                 L8L,            /* L8400L */
 136                 M1A,            /* M1300A */
 137                 M2E,            /* M2400E, L4400L */
 138                 M6N,            /* M6800N, W3400N */
 139                 M6R,            /* M6700R, A3000G */
 140                 P30,            /* Samsung P30 */
 141                 S1x,            /* S1300A, but also L1400B and M2400A (L84F) */
 142                 S2x,            /* S200 (J1 reported), Victor MP-XP7210 */
 143                 W1N,            /* W1000N */
 144                 W5A,            /* W5A */
 145                 W3V,            /* W3030V */
 146                 xxN,            /* M2400N, M3700N, M5200N, M6800N,
 147                                                          S1300N, S5200N*/
 148                 A4S,            /* Z81sp */
 149                 F3Sa,           /* (Centrino) */
 150                 R1F,
 151                 END_MODEL
 152         } model;                /* Models currently supported */
 153         u16 event_count[128];   /* Count for each event TODO make this better */
 154 };
 155
 156 /* Here we go */
 157 #define A1x_PREFIX "\\_SB.PCI0.ISA.EC0."
 158 #define L3C_PREFIX "\\_SB.PCI0.PX40.ECD0."
 159 #define M1A_PREFIX "\\_SB.PCI0.PX40.EC0."
 160 #define P30_PREFIX "\\_SB.PCI0.LPCB.EC0."
 161 #define S1x_PREFIX "\\_SB.PCI0.PX40."
 162 #define S2x_PREFIX A1x_PREFIX
 163 #define xxN_PREFIX "\\_SB.PCI0.SBRG.EC0."
 164
 165 static struct model_data model_conf[END_MODEL] = {
 166         /*
 167          * TODO I have seen a SWBX and AIBX method on some models, like L1400B,
 168          * it seems to be a kind of switch, but what for ?
 169          */
 170
 171         {
 172          .name = "A1x",
 173          .mt_mled = "MLED",
 174          .mled_status = "\\MAIL",
 175          .mt_lcd_switch = A1x_PREFIX "_Q10",
 176          .lcd_status = "\\BKLI",
 177          .brightness_up = A1x_PREFIX "_Q0E",
 178          .brightness_down = A1x_PREFIX "_Q0F"},
 179
 180         {
 181          .name = "A2x",
 182          .mt_mled = "MLED",
 183          .mt_wled = "WLED",
 184          .wled_status = "\\SG66",
 185          .mt_lcd_switch = "\\Q10",
 186          .lcd_status = "\\BAOF",
 187          .brightness_set = "SPLV",
 188          .brightness_get = "GPLV",
 189          .display_set = "SDSP",
 190          .display_get = "\\INFB"},
 191
 192         {
 193          .name = "A4G",
 194          .mt_mled = "MLED",
 195 /* WLED present, but not controlled by ACPI */
 196          .mt_lcd_switch = xxN_PREFIX "_Q10",
 197          .brightness_set = "SPLV",
 198          .brightness_get = "GPLV",
 199          .display_set = "SDSP",
 200          .display_get = "\\ADVG"},
 201
 202         {
 203          .name = "D1x",
 204          .mt_mled = "MLED",
 205          .mt_lcd_switch = "\\Q0D",
 206          .lcd_status = "\\GP11",
 207          .brightness_up = "\\Q0C",
 208          .brightness_down = "\\Q0B",
 209          .brightness_status = "\\BLVL",
 210          .display_set = "SDSP",
 211          .display_get = "\\INFB"},
 212
 213         {
 214          .name = "L2D",
 215          .mt_mled = "MLED",
 216          .mled_status = "\\SGP6",
 217          .mt_wled = "WLED",
 218          .wled_status = "\\RCP3",
 219          .mt_lcd_switch = "\\Q10",
 220          .lcd_status = "\\SGP0",
 221          .brightness_up = "\\Q0E",
 222          .brightness_down = "\\Q0F",
 223          .display_set = "SDSP",
 224          .display_get = "\\INFB"},
 225
 226         {
 227          .name = "L3C",
 228          .mt_mled = "MLED",
 229          .mt_wled = "WLED",
 230          .mt_lcd_switch = L3C_PREFIX "_Q10",
 231          .lcd_status = "\\GL32",
 232          .brightness_set = "SPLV",
 233          .brightness_get = "GPLV",
 234          .display_set = "SDSP",
 235          .display_get = "\\_SB.PCI0.PCI1.VGAC.NMAP"},
 236
 237         {
 238          .name = "L3D",
 239          .mt_mled = "MLED",
 240          .mled_status = "\\MALD",
 241          .mt_wled = "WLED",
 242          .mt_lcd_switch = "\\Q10",
 243          .lcd_status = "\\BKLG",
 244          .brightness_set = "SPLV",
 245          .brightness_get = "GPLV",
 246          .display_set = "SDSP",
 247          .display_get = "\\INFB"},
 248
 249         {
 250          .name = "L3H",
 251          .mt_mled = "MLED",
 252          .mt_wled = "WLED",
 253          .mt_lcd_switch = "EHK",
 254          .lcd_status = "\\_SB.PCI0.PM.PBC",
 255          .brightness_set = "SPLV",
 256          .brightness_get = "GPLV",
 257          .display_set = "SDSP",
 258          .display_get = "\\INFB"},
 259
 260         {
 261          .name = "L4R",
 262          .mt_mled = "MLED",
 263          .mt_wled = "WLED",
 264          .wled_status = "\\_SB.PCI0.SBRG.SG13",
 265          .mt_lcd_switch = xxN_PREFIX "_Q10",
 266          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
 267          .brightness_set = "SPLV",
 268          .brightness_get = "GPLV",
 269          .display_set = "SDSP",
 270          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
 271
 272         {
 273          .name = "L5x",
 274          .mt_mled = "MLED",
 275 /* WLED present, but not controlled by ACPI */
 276          .mt_tled = "TLED",
 277          .mt_lcd_switch = "\\Q0D",
 278          .lcd_status = "\\BAOF",
 279          .brightness_set = "SPLV",
 280          .brightness_get = "GPLV",
 281          .display_set = "SDSP",
 282          .display_get = "\\INFB"},
 283
 284         {
 285          .name = "L8L"
 286 /* No features, but at least support the hotkeys */
 287          },
 288
 289         {
 290          .name = "M1A",
 291          .mt_mled = "MLED",
 292          .mt_lcd_switch = M1A_PREFIX "Q10",
 293          .lcd_status = "\\PNOF",
 294          .brightness_up = M1A_PREFIX "Q0E",
 295          .brightness_down = M1A_PREFIX "Q0F",
 296          .brightness_status = "\\BRIT",
 297          .display_set = "SDSP",
 298          .display_get = "\\INFB"},
 299
 300         {
 301          .name = "M2E",
 302          .mt_mled = "MLED",
 303          .mt_wled = "WLED",
 304          .mt_lcd_switch = "\\Q10",
 305          .lcd_status = "\\GP06",
 306          .brightness_set = "SPLV",
 307          .brightness_get = "GPLV",
 308          .display_set = "SDSP",
 309          .display_get = "\\INFB"},
 310
 311         {
 312          .name = "M6N",
 313          .mt_mled = "MLED",
 314          .mt_wled = "WLED",
 315          .wled_status = "\\_SB.PCI0.SBRG.SG13",
 316          .mt_lcd_switch = xxN_PREFIX "_Q10",
 317          .lcd_status = "\\_SB.BKLT",
 318          .brightness_set = "SPLV",
 319          .brightness_get = "GPLV",
 320          .display_set = "SDSP",
 321          .display_get = "\\SSTE"},
 322
 323         {
 324          .name = "M6R",
 325          .mt_mled = "MLED",
 326          .mt_wled = "WLED",
 327          .mt_lcd_switch = xxN_PREFIX "_Q10",
 328          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
 329          .brightness_set = "SPLV",
 330          .brightness_get = "GPLV",
 331          .display_set = "SDSP",
 332          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
 333
 334         {
 335          .name = "P30",
 336          .mt_wled = "WLED",
 337          .mt_lcd_switch = P30_PREFIX "_Q0E",
 338          .lcd_status = "\\BKLT",
 339          .brightness_up = P30_PREFIX "_Q68",
 340          .brightness_down = P30_PREFIX "_Q69",
 341          .brightness_get = "GPLV",
 342          .display_set = "SDSP",
 343          .display_get = "\\DNXT"},
 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          .name = "S2x",
 357          .mt_mled = "MLED",
 358          .mled_status = "\\MAIL",
 359          .mt_lcd_switch = S2x_PREFIX "_Q10",
 360          .lcd_status = "\\BKLI",
 361          .brightness_up = S2x_PREFIX "_Q0B",
 362          .brightness_down = S2x_PREFIX "_Q0A"},
 363
 364         {
 365          .name = "W1N",
 366          .mt_mled = "MLED",
 367          .mt_wled = "WLED",
 368          .mt_ledd = "SLCM",
 369          .mt_lcd_switch = xxN_PREFIX "_Q10",
 370          .lcd_status = "\\BKLT",
 371          .brightness_set = "SPLV",
 372          .brightness_get = "GPLV",
 373          .display_set = "SDSP",
 374          .display_get = "\\ADVG"},
 375
 376         {
 377          .name = "W5A",
 378          .mt_bt_switch = "BLED",
 379          .mt_wled = "WLED",
 380          .mt_lcd_switch = xxN_PREFIX "_Q10",
 381          .brightness_set = "SPLV",
 382          .brightness_get = "GPLV",
 383          .display_set = "SDSP",
 384          .display_get = "\\ADVG"},
 385
 386         {
 387          .name = "W3V",
 388          .mt_mled = "MLED",
 389          .mt_wled = "WLED",
 390          .mt_lcd_switch = xxN_PREFIX "_Q10",
 391          .lcd_status = "\\BKLT",
 392          .brightness_set = "SPLV",
 393          .brightness_get = "GPLV",
 394          .display_set = "SDSP",
 395          .display_get = "\\INFB"},
 396
 397        {
 398          .name = "xxN",
 399          .mt_mled = "MLED",
 400 /* WLED present, but not controlled by ACPI */
 401          .mt_lcd_switch = xxN_PREFIX "_Q10",
 402          .lcd_status = "\\BKLT",
 403          .brightness_set = "SPLV",
 404          .brightness_get = "GPLV",
 405          .display_set = "SDSP",
 406         .display_get = "\\ADVG"},
 407
 408         {
 409                 .name              = "A4S",
 410                 .brightness_set    = "SPLV",
 411                 .brightness_get    = "GPLV",
 412                 .mt_bt_switch      = "BLED",
 413                 .mt_wled           = "WLED"
 414         },
 415
 416         {
 417                 .name           = "F3Sa",
 418                 .mt_bt_switch   = "BLED",
 419                 .mt_wled        = "WLED",
 420                 .mt_mled        = "MLED",
 421                 .brightness_get = "GPLV",
 422                 .brightness_set = "SPLV",
 423                 .mt_lcd_switch  = "\\_SB.PCI0.SBRG.EC0._Q10",
 424                 .lcd_status     = "\\_SB.PCI0.SBRG.EC0.RPIN",
 425                 .display_get    = "\\ADVG",
 426                 .display_set    = "SDSP",
 427         },
 428         {
 429                 .name = "R1F",
 430                 .mt_bt_switch = "BLED",
 431                 .mt_mled = "MLED",
 432                 .mt_wled = "WLED",
 433                 .mt_lcd_switch = "\\Q10",
 434                 .lcd_status = "\\GP06",
 435                 .brightness_set = "SPLV",
 436                 .brightness_get = "GPLV",
 437                 .display_set = "SDSP",
 438                 .display_get = "\\INFB"
 439         }
 440 };
 441
 442 /* procdir we use */
 443 static struct proc_dir_entry *asus_proc_dir;
 444
 445 static struct backlight_device *asus_backlight_device;
 446
 447 /*
 448  * This header is made available to allow proper configuration given model,
 449  * revision number , ... this info cannot go in struct asus_hotk because it is
 450  * available before the hotk
 451  */
 452 static struct acpi_table_header *asus_info;
 453
 454 /* The actual device the driver binds to */
 455 static struct asus_hotk *hotk;
 456
 457 /*
 458  * The hotkey driver and autoloading declaration
 459  */
 460 static int asus_hotk_add(struct acpi_device *device);
 461 static int asus_hotk_remove(struct acpi_device *device, int type);
 462 static void asus_hotk_notify(struct acpi_device *device, u32 event);
 463
 464 static const struct acpi_device_id asus_device_ids[] = {
 465         {"ATK0100", 0},
 466         {"", 0},
 467 };
 468 MODULE_DEVICE_TABLE(acpi, asus_device_ids);
 469
 470 static struct acpi_driver asus_hotk_driver = {
 471         .name = "asus_acpi",
 472         .class = ACPI_HOTK_CLASS,
 473         .owner = THIS_MODULE,
 474         .ids = asus_device_ids,
 475         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
 476         .ops = {
 477                 .add = asus_hotk_add,
 478                 .remove = asus_hotk_remove,
 479                 .notify = asus_hotk_notify,
 480                 },
 481 };
 482
 483 /*
 484  * This function evaluates an ACPI method, given an int as parameter, the
 485  * method is searched within the scope of the handle, can be NULL. The output
 486  * of the method is written is output, which can also be NULL
 487  *
 488  * returns 1 if write is successful, 0 else.
 489  */
 490 static int write_acpi_int(acpi_handle handle, const char *method, int val,
 491                           struct acpi_buffer *output)
 492 {
 493         struct acpi_object_list params; /* list of input parameters (int) */
 494         union acpi_object in_obj;       /* the only param we use */
 495         acpi_status status;
 496
 497         params.count = 1;
 498         params.pointer = &in_obj;
 499         in_obj.type = ACPI_TYPE_INTEGER;
 500         in_obj.integer.value = val;
 501
 502         status = acpi_evaluate_object(handle, (char *)method, &params, output);
 503         return (status == AE_OK);
 504 }
 505
 506 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
 507 {
 508         struct acpi_buffer output;
 509         union acpi_object out_obj;
 510         acpi_status status;
 511
 512         output.length = sizeof(out_obj);
 513         output.pointer = &out_obj;
 514
 515         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
 516         *val = out_obj.integer.value;
 517         return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
 518 }
 519
 520 static int asus_info_proc_show(struct seq_file *m, void *v)
 521 {
 522         int temp;
 523
 524         seq_printf(m, ACPI_HOTK_NAME " " ASUS_ACPI_VERSION "\n");
 525         seq_printf(m, "Model reference    : %s\n", hotk->methods->name);
 526         /*
 527          * The SFUN method probably allows the original driver to get the list
 528          * of features supported by a given model. For now, 0x0100 or 0x0800
 529          * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
 530          * The significance of others is yet to be found.
 531          */
 532         if (read_acpi_int(hotk->handle, "SFUN", &temp))
 533                 seq_printf(m, "SFUN value         : 0x%04x\n", temp);
 534         /*
 535          * Another value for userspace: the ASYM method returns 0x02 for
 536          * battery low and 0x04 for battery critical, its readings tend to be
 537          * more accurate than those provided by _BST.
 538          * Note: since not all the laptops provide this method, errors are
 539          * silently ignored.
 540          */
 541         if (read_acpi_int(hotk->handle, "ASYM", &temp))
 542                 seq_printf(m, "ASYM value         : 0x%04x\n", temp);
 543         if (asus_info) {
 544                 seq_printf(m, "DSDT length        : %d\n", asus_info->length);
 545                 seq_printf(m, "DSDT checksum      : %d\n", asus_info->checksum);
 546                 seq_printf(m, "DSDT revision      : %d\n", asus_info->revision);
 547                 seq_printf(m, "OEM id             : %.*s\n", ACPI_OEM_ID_SIZE, asus_info->oem_id);
 548                 seq_printf(m, "OEM table id       : %.*s\n", ACPI_OEM_TABLE_ID_SIZE, asus_info->oem_table_id);
 549                 seq_printf(m, "OEM revision       : 0x%x\n", asus_info->oem_revision);
 550                 seq_printf(m, "ASL comp vendor id : %.*s\n", ACPI_NAME_SIZE, asus_info->asl_compiler_id);
 551                 seq_printf(m, "ASL comp revision  : 0x%x\n", asus_info->asl_compiler_revision);
 552         }
 553
 554         return 0;
 555 }
 556
 557 static int asus_info_proc_open(struct inode *inode, struct file *file)
 558 {
 559         return single_open(file, asus_info_proc_show, NULL);
 560 }
 561
 562 static const struct file_operations asus_info_proc_fops = {
 563         .owner          = THIS_MODULE,
 564         .open           = asus_info_proc_open,
 565         .read           = seq_read,
 566         .llseek         = seq_lseek,
 567         .release        = single_release,
 568 };
 569
 570 /*
 571  * /proc handlers
 572  * We write our info in page, we begin at offset off and cannot write more
 573  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 574  * number of bytes written in page
 575  */
 576
 577 /* Generic LED functions */
 578 static int read_led(const char *ledname, int ledmask)
 579 {
 580         if (ledname) {
 581                 int led_status;
 582
 583                 if (read_acpi_int(NULL, ledname, &led_status))
 584                         return led_status;
 585                 else
 586                         pr_warn("Error reading LED status\n");
 587         }
 588         return (hotk->status & ledmask) ? 1 : 0;
 589 }
 590
 591 static int parse_arg(const char __user *buf, unsigned long count, int *val)
 592 {
 593         char s[32];
 594         if (!count)
 595                 return 0;
 596         if (count > 31)
 597                 return -EINVAL;
 598         if (copy_from_user(s, buf, count))
 599                 return -EFAULT;
 600         s[count] = 0;
 601         if (sscanf(s, "%i", val) != 1)
 602                 return -EINVAL;
 603         return count;
 604 }
 605
 606 /* FIXME: kill extraneous args so it can be called independently */
 607 static int
 608 write_led(const char __user *buffer, unsigned long count,
 609           char *ledname, int ledmask, int invert)
 610 {
 611         int rv, value;
 612         int led_out = 0;
 613
 614         rv = parse_arg(buffer, count, &value);
 615         if (rv > 0)
 616                 led_out = value ? 1 : 0;
 617
 618         hotk->status =
 619             (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);
 620
 621         if (invert)             /* invert target value */
 622                 led_out = !led_out;
 623
 624         if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
 625                 pr_warn("LED (%s) write failed\n", ledname);
 626
 627         return rv;
 628 }
 629
 630 /*
 631  * Proc handlers for MLED
 632  */
 633 static int mled_proc_show(struct seq_file *m, void *v)
 634 {
 635         seq_printf(m, "%d\n", read_led(hotk->methods->mled_status, MLED_ON));
 636         return 0;
 637 }
 638
 639 static int mled_proc_open(struct inode *inode, struct file *file)
 640 {
 641         return single_open(file, mled_proc_show, NULL);
 642 }
 643
 644 static ssize_t mled_proc_write(struct file *file, const char __user *buffer,
 645                 size_t count, loff_t *pos)
 646 {
 647         return write_led(buffer, count, hotk->methods->mt_mled, MLED_ON, 1);
 648 }
 649
 650 static const struct file_operations mled_proc_fops = {
 651         .owner          = THIS_MODULE,
 652         .open           = mled_proc_open,
 653         .read           = seq_read,
 654         .llseek         = seq_lseek,
 655         .release        = single_release,
 656         .write          = mled_proc_write,
 657 };
 658
 659 /*
 660  * Proc handlers for LED display
 661  */
 662 static int ledd_proc_show(struct seq_file *m, void *v)
 663 {
 664         seq_printf(m, "0x%08x\n", hotk->ledd_status);
 665         return 0;
 666 }
 667
 668 static int ledd_proc_open(struct inode *inode, struct file *file)
 669 {
 670         return single_open(file, ledd_proc_show, NULL);
 671 }
 672
 673 static ssize_t ledd_proc_write(struct file *file, const char __user *buffer,
 674                 size_t count, loff_t *pos)
 675 {
 676         int rv, value;
 677
 678         rv = parse_arg(buffer, count, &value);
 679         if (rv > 0) {
 680                 if (!write_acpi_int
 681                     (hotk->handle, hotk->methods->mt_ledd, value, NULL))
 682                         pr_warn("LED display write failed\n");
 683                 else
 684                         hotk->ledd_status = (u32) value;
 685         }
 686         return rv;
 687 }
 688
 689 static const struct file_operations ledd_proc_fops = {
 690         .owner          = THIS_MODULE,
 691         .open           = ledd_proc_open,
 692         .read           = seq_read,
 693         .llseek         = seq_lseek,
 694         .release        = single_release,
 695         .write          = ledd_proc_write,
 696 };
 697
 698 /*
 699  * Proc handlers for WLED
 700  */
 701 static int wled_proc_show(struct seq_file *m, void *v)
 702 {
 703         seq_printf(m, "%d\n", read_led(hotk->methods->wled_status, WLED_ON));
 704         return 0;
 705 }
 706
 707 static int wled_proc_open(struct inode *inode, struct file *file)
 708 {
 709         return single_open(file, wled_proc_show, NULL);
 710 }
 711
 712 static ssize_t wled_proc_write(struct file *file, const char __user *buffer,
 713                 size_t count, loff_t *pos)
 714 {
 715         return write_led(buffer, count, hotk->methods->mt_wled, WLED_ON, 0);
 716 }
 717
 718 static const struct file_operations wled_proc_fops = {
 719         .owner          = THIS_MODULE,
 720         .open           = wled_proc_open,
 721         .read           = seq_read,
 722         .llseek         = seq_lseek,
 723         .release        = single_release,
 724         .write          = wled_proc_write,
 725 };
 726
 727 /*
 728  * Proc handlers for Bluetooth
 729  */
 730 static int bluetooth_proc_show(struct seq_file *m, void *v)
 731 {
 732         seq_printf(m, "%d\n", read_led(hotk->methods->bt_status, BT_ON));
 733         return 0;
 734 }
 735
 736 static int bluetooth_proc_open(struct inode *inode, struct file *file)
 737 {
 738         return single_open(file, bluetooth_proc_show, NULL);
 739 }
 740
 741 static ssize_t bluetooth_proc_write(struct file *file,
 742                 const char __user *buffer, size_t count, loff_t *pos)
 743 {
 744         /* Note: mt_bt_switch controls both internal Bluetooth adapter's
 745            presence and its LED */
 746         return write_led(buffer, count, hotk->methods->mt_bt_switch, BT_ON, 0);
 747 }
 748
 749 static const struct file_operations bluetooth_proc_fops = {
 750         .owner          = THIS_MODULE,
 751         .open           = bluetooth_proc_open,
 752         .read           = seq_read,
 753         .llseek         = seq_lseek,
 754         .release        = single_release,
 755         .write          = bluetooth_proc_write,
 756 };
 757
 758 /*
 759  * Proc handlers for TLED
 760  */
 761 static int tled_proc_show(struct seq_file *m, void *v)
 762 {
 763         seq_printf(m, "%d\n", read_led(hotk->methods->tled_status, TLED_ON));
 764         return 0;
 765 }
 766
 767 static int tled_proc_open(struct inode *inode, struct file *file)
 768 {
 769         return single_open(file, tled_proc_show, NULL);
 770 }
 771
 772 static ssize_t tled_proc_write(struct file *file, const char __user *buffer,
 773                 size_t count, loff_t *pos)
 774 {
 775         return write_led(buffer, count, hotk->methods->mt_tled, TLED_ON, 0);
 776 }
 777
 778 static const struct file_operations tled_proc_fops = {
 779         .owner          = THIS_MODULE,
 780         .open           = tled_proc_open,
 781         .read           = seq_read,
 782         .llseek         = seq_lseek,
 783         .release        = single_release,
 784         .write          = tled_proc_write,
 785 };
 786
 787 static int get_lcd_state(void)
 788 {
 789         int lcd = 0;
 790
 791         if (hotk->model == L3H) {
 792                 /* L3H and the like have to be handled differently */
 793                 acpi_status status = 0;
 794                 struct acpi_object_list input;
 795                 union acpi_object mt_params[2];
 796                 struct acpi_buffer output;
 797                 union acpi_object out_obj;
 798
 799                 input.count = 2;
 800                 input.pointer = mt_params;
 801                 /* Note: the following values are partly guessed up, but
 802                    otherwise they seem to work */
 803                 mt_params[0].type = ACPI_TYPE_INTEGER;
 804                 mt_params[0].integer.value = 0x02;
 805                 mt_params[1].type = ACPI_TYPE_INTEGER;
 806                 mt_params[1].integer.value = 0x02;
 807
 808                 output.length = sizeof(out_obj);
 809                 output.pointer = &out_obj;
 810
 811                 status =
 812                     acpi_evaluate_object(NULL, hotk->methods->lcd_status,
 813                                          &input, &output);
 814                 if (status != AE_OK)
 815                         return -1;
 816                 if (out_obj.type == ACPI_TYPE_INTEGER)
 817                         /* That's what the AML code does */
 818                         lcd = out_obj.integer.value >> 8;
 819         } else if (hotk->model == F3Sa) {
 820                 unsigned long long tmp;
 821                 union acpi_object param;
 822                 struct acpi_object_list input;
 823                 acpi_status status;
 824
 825                 /* Read pin 11 */
 826                 param.type = ACPI_TYPE_INTEGER;
 827                 param.integer.value = 0x11;
 828                 input.count = 1;
 829                 input.pointer = &param;
 830
 831                 status = acpi_evaluate_integer(NULL, hotk->methods->lcd_status,
 832                                                 &input, &tmp);
 833                 if (status != AE_OK)
 834                         return -1;
 835
 836                 lcd = tmp;
 837         } else {
 838                 /* We don't have to check anything if we are here */
 839                 if (!read_acpi_int(NULL, hotk->methods->lcd_status, &lcd))
 840                         pr_warn("Error reading LCD status\n");
 841
 842                 if (hotk->model == L2D)
 843                         lcd = ~lcd;
 844         }
 845
 846         return (lcd & 1);
 847 }
 848
 849 static int set_lcd_state(int value)
 850 {
 851         int lcd = 0;
 852         acpi_status status = 0;
 853
 854         lcd = value ? 1 : 0;
 855         if (lcd != get_lcd_state()) {
 856                 /* switch */
 857                 if (hotk->model != L3H) {
 858                         status =
 859                             acpi_evaluate_object(NULL,
 860                                                  hotk->methods->mt_lcd_switch,
 861                                                  NULL, NULL);
 862                 } else {
 863                         /* L3H and the like must be handled differently */
 864                         if (!write_acpi_int
 865                             (hotk->handle, hotk->methods->mt_lcd_switch, 0x07,
 866                              NULL))
 867                                 status = AE_ERROR;
 868                         /* L3H's AML executes EHK (0x07) upon Fn+F7 keypress,
 869                            the exact behaviour is simulated here */
 870                 }
 871                 if (ACPI_FAILURE(status))
 872                         pr_warn("Error switching LCD\n");
 873         }
 874         return 0;
 875
 876 }
 877
 878 static int lcd_proc_show(struct seq_file *m, void *v)
 879 {
 880         seq_printf(m, "%d\n", get_lcd_state());
 881         return 0;
 882 }
 883
 884 static int lcd_proc_open(struct inode *inode, struct file *file)
 885 {
 886         return single_open(file, lcd_proc_show, NULL);
 887 }
 888
 889 static ssize_t lcd_proc_write(struct file *file, const char __user *buffer,
 890                size_t count, loff_t *pos)
 891 {
 892         int rv, value;
 893
 894         rv = parse_arg(buffer, count, &value);
 895         if (rv > 0)
 896                 set_lcd_state(value);
 897         return rv;
 898 }
 899
 900 static const struct file_operations lcd_proc_fops = {
 901         .owner          = THIS_MODULE,
 902         .open           = lcd_proc_open,
 903         .read           = seq_read,
 904         .llseek         = seq_lseek,
 905         .release        = single_release,
 906         .write          = lcd_proc_write,
 907 };
 908
 909 static int read_brightness(struct backlight_device *bd)
 910 {
 911         int value;
 912
 913         if (hotk->methods->brightness_get) {    /* SPLV/GPLV laptop */
 914                 if (!read_acpi_int(hotk->handle, hotk->methods->brightness_get,
 915                                    &value))
 916                         pr_warn("Error reading brightness\n");
 917         } else if (hotk->methods->brightness_status) {  /* For D1 for example */
 918                 if (!read_acpi_int(NULL, hotk->methods->brightness_status,
 919                                    &value))
 920                         pr_warn("Error reading brightness\n");
 921         } else                  /* No GPLV method */
 922                 value = hotk->brightness;
 923         return value;
 924 }
 925
 926 /*
 927  * Change the brightness level
 928  */
 929 static int set_brightness(int value)
 930 {
 931         acpi_status status = 0;
 932         int ret = 0;
 933
 934         /* SPLV laptop */
 935         if (hotk->methods->brightness_set) {
 936                 if (!write_acpi_int(hotk->handle, hotk->methods->brightness_set,
 937                                     value, NULL)) {
 938                         pr_warn("Error changing brightness\n");
 939                         ret = -EIO;
 940                 }
 941                 goto out;
 942         }
 943
 944         /* No SPLV method if we are here, act as appropriate */
 945         value -= read_brightness(NULL);
 946         while (value != 0) {
 947                 status = acpi_evaluate_object(NULL, (value > 0) ?
 948                                               hotk->methods->brightness_up :
 949                                               hotk->methods->brightness_down,
 950                                               NULL, NULL);
 951                 (value > 0) ? value-- : value++;
 952                 if (ACPI_FAILURE(status)) {
 953                         pr_warn("Error changing brightness\n");
 954                         ret = -EIO;
 955                 }
 956         }
 957 out:
 958         return ret;
 959 }
 960
 961 static int set_brightness_status(struct backlight_device *bd)
 962 {
 963         return set_brightness(bd->props.brightness);
 964 }
 965
 966 static int brn_proc_show(struct seq_file *m, void *v)
 967 {
 968         seq_printf(m, "%d\n", read_brightness(NULL));
 969         return 0;
 970 }
 971
 972 static int brn_proc_open(struct inode *inode, struct file *file)
 973 {
 974         return single_open(file, brn_proc_show, NULL);
 975 }
 976
 977 static ssize_t brn_proc_write(struct file *file, const char __user *buffer,
 978                size_t count, loff_t *pos)
 979 {
 980         int rv, value;
 981
 982         rv = parse_arg(buffer, count, &value);
 983         if (rv > 0) {
 984                 value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
 985                 /* 0 <= value <= 15 */
 986                 set_brightness(value);
 987         }
 988         return rv;
 989 }
 990
 991 static const struct file_operations brn_proc_fops = {
 992         .owner          = THIS_MODULE,
 993         .open           = brn_proc_open,
 994         .read           = seq_read,
 995         .llseek         = seq_lseek,
 996         .release        = single_release,
 997         .write          = brn_proc_write,
 998 };
 999
1000 static void set_display(int value)
1001 {
1002         /* no sanity check needed for now */
1003         if (!write_acpi_int(hotk->handle, hotk->methods->display_set,
1004                             value, NULL))
1005                 pr_warn("Error setting display\n");
1006         return;
1007 }
1008
1009 /*
1010  * Now, *this* one could be more user-friendly, but so far, no-one has
1011  * complained. The significance of bits is the same as in proc_write_disp()
1012  */
1013 static int disp_proc_show(struct seq_file *m, void *v)
1014 {
1015         int value = 0;
1016
1017         if (!read_acpi_int(hotk->handle, hotk->methods->display_get, &value))
1018                 pr_warn("Error reading display status\n");
1019         value &= 0x07;  /* needed for some models, shouldn't hurt others */
1020         seq_printf(m, "%d\n", value);
1021         return 0;
1022 }
1023
1024 static int disp_proc_open(struct inode *inode, struct file *file)
1025 {
1026         return single_open(file, disp_proc_show, NULL);
1027 }
1028
1029 /*
1030  * Experimental support for display switching. As of now: 1 should activate
1031  * the LCD output, 2 should do for CRT, and 4 for TV-Out. Any combination
1032  * (bitwise) of these will suffice. I never actually tested 3 displays hooked
1033  * up simultaneously, so be warned. See the acpi4asus README for more info.
1034  */
1035 static ssize_t disp_proc_write(struct file *file, const char __user *buffer,
1036                 size_t count, loff_t *pos)
1037 {
1038         int rv, value;
1039
1040         rv = parse_arg(buffer, count, &value);
1041         if (rv > 0)
1042                 set_display(value);
1043         return rv;
1044 }
1045
1046 static const struct file_operations disp_proc_fops = {
1047         .owner          = THIS_MODULE,
1048         .open           = disp_proc_open,
1049         .read           = seq_read,
1050         .llseek         = seq_lseek,
1051         .release        = single_release,
1052         .write          = disp_proc_write,
1053 };
1054
1055 static int
1056 asus_proc_add(char *name, const struct file_operations *proc_fops, mode_t mode,
1057                      struct acpi_device *device)
1058 {
1059         struct proc_dir_entry *proc;
1060
1061         proc = proc_create_data(name, mode, acpi_device_dir(device),
1062                                 proc_fops, acpi_driver_data(device));
1063         if (!proc) {
1064                 pr_warn("  Unable to create %s fs entry\n", name);
1065                 return -1;
1066         }
1067         proc->uid = asus_uid;
1068         proc->gid = asus_gid;
1069         return 0;
1070 }
1071
1072 static int asus_hotk_add_fs(struct acpi_device *device)
1073 {
1074         struct proc_dir_entry *proc;
1075         mode_t mode;
1076
1077         if ((asus_uid == 0) && (asus_gid == 0)) {
1078                 mode = S_IFREG | S_IRUGO | S_IWUSR | S_IWGRP;
1079         } else {
1080                 mode = S_IFREG | S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
1081                 pr_warn("  asus_uid and asus_gid parameters are "
1082                         "deprecated, use chown and chmod instead!\n");
1083         }
1084
1085         acpi_device_dir(device) = asus_proc_dir;
1086         if (!acpi_device_dir(device))
1087                 return -ENODEV;
1088
1089         proc = proc_create(PROC_INFO, mode, acpi_device_dir(device),
1090                            &asus_info_proc_fops);
1091         if (proc) {
1092                 proc->uid = asus_uid;
1093                 proc->gid = asus_gid;
1094         } else {
1095                 pr_warn("  Unable to create " PROC_INFO " fs entry\n");
1096         }
1097
1098         if (hotk->methods->mt_wled) {
1099                 asus_proc_add(PROC_WLED, &wled_proc_fops, mode, device);
1100         }
1101
1102         if (hotk->methods->mt_ledd) {
1103                 asus_proc_add(PROC_LEDD, &ledd_proc_fops, mode, device);
1104         }
1105
1106         if (hotk->methods->mt_mled) {
1107                 asus_proc_add(PROC_MLED, &mled_proc_fops, mode, device);
1108         }
1109
1110         if (hotk->methods->mt_tled) {
1111                 asus_proc_add(PROC_TLED, &tled_proc_fops, mode, device);
1112         }
1113
1114         if (hotk->methods->mt_bt_switch) {
1115                 asus_proc_add(PROC_BT, &bluetooth_proc_fops, mode, device);
1116         }
1117
1118         /*
1119          * We need both read node and write method as LCD switch is also
1120          * accessible from the keyboard
1121          */
1122         if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status) {
1123                 asus_proc_add(PROC_LCD, &lcd_proc_fops, mode, device);
1124         }
1125
1126         if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
1127             (hotk->methods->brightness_get && hotk->methods->brightness_set)) {
1128                 asus_proc_add(PROC_BRN, &brn_proc_fops, mode, device);
1129         }
1130
1131         if (hotk->methods->display_set) {
1132                 asus_proc_add(PROC_DISP, &disp_proc_fops, mode, device);
1133         }
1134
1135         return 0;
1136 }
1137
1138 static int asus_hotk_remove_fs(struct acpi_device *device)
1139 {
1140         if (acpi_device_dir(device)) {
1141                 remove_proc_entry(PROC_INFO, acpi_device_dir(device));
1142                 if (hotk->methods->mt_wled)
1143                         remove_proc_entry(PROC_WLED, acpi_device_dir(device));
1144                 if (hotk->methods->mt_mled)
1145                         remove_proc_entry(PROC_MLED, acpi_device_dir(device));
1146                 if (hotk->methods->mt_tled)
1147                         remove_proc_entry(PROC_TLED, acpi_device_dir(device));
1148                 if (hotk->methods->mt_ledd)
1149                         remove_proc_entry(PROC_LEDD, acpi_device_dir(device));
1150                 if (hotk->methods->mt_bt_switch)
1151                         remove_proc_entry(PROC_BT, acpi_device_dir(device));
1152                 if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status)
1153                         remove_proc_entry(PROC_LCD, acpi_device_dir(device));
1154                 if ((hotk->methods->brightness_up
1155                      && hotk->methods->brightness_down)
1156                     || (hotk->methods->brightness_get
1157                         && hotk->methods->brightness_set))
1158                         remove_proc_entry(PROC_BRN, acpi_device_dir(device));
1159                 if (hotk->methods->display_set)
1160                         remove_proc_entry(PROC_DISP, acpi_device_dir(device));
1161         }
1162         return 0;
1163 }
1164
1165 static void asus_hotk_notify(struct acpi_device *device, u32 event)
1166 {
1167         /* TODO Find a better way to handle events count. */
1168         if (!hotk)
1169                 return;
1170
1171         /*
1172          * The BIOS *should* be sending us device events, but apparently
1173          * Asus uses system events instead, so just ignore any device
1174          * events we get.
1175          */
1176         if (event > ACPI_MAX_SYS_NOTIFY)
1177                 return;
1178
1179         if ((event & ~((u32) BR_UP)) < 16)
1180                 hotk->brightness = (event & ~((u32) BR_UP));
1181         else if ((event & ~((u32) BR_DOWN)) < 16)
1182                 hotk->brightness = (event & ~((u32) BR_DOWN));
1183
1184         acpi_bus_generate_proc_event(hotk->device, event,
1185                                 hotk->event_count[event % 128]++);
1186
1187         return;
1188 }
1189
1190 /*
1191  * Match the model string to the list of supported models. Return END_MODEL if
1192  * no match or model is NULL.
1193  */
1194 static int asus_model_match(char *model)
1195 {
1196         if (model == NULL)
1197                 return END_MODEL;
1198
1199         if (strncmp(model, "L3D", 3) == 0)
1200                 return L3D;
1201         else if (strncmp(model, "L2E", 3) == 0 ||
1202                  strncmp(model, "L3H", 3) == 0 || strncmp(model, "L5D", 3) == 0)
1203                 return L3H;
1204         else if (strncmp(model, "L3", 2) == 0 || strncmp(model, "L2B", 3) == 0)
1205                 return L3C;
1206         else if (strncmp(model, "L8L", 3) == 0)
1207                 return L8L;
1208         else if (strncmp(model, "L4R", 3) == 0)
1209                 return L4R;
1210         else if (strncmp(model, "M6N", 3) == 0 || strncmp(model, "W3N", 3) == 0)
1211                 return M6N;
1212         else if (strncmp(model, "M6R", 3) == 0 || strncmp(model, "A3G", 3) == 0)
1213                 return M6R;
1214         else if (strncmp(model, "M2N", 3) == 0 ||
1215                  strncmp(model, "M3N", 3) == 0 ||
1216                  strncmp(model, "M5N", 3) == 0 ||
1217                  strncmp(model, "S1N", 3) == 0 ||
1218                  strncmp(model, "S5N", 3) == 0)
1219                 return xxN;
1220         else if (strncmp(model, "M1", 2) == 0)
1221                 return M1A;
1222         else if (strncmp(model, "M2", 2) == 0 || strncmp(model, "L4E", 3) == 0)
1223                 return M2E;
1224         else if (strncmp(model, "L2", 2) == 0)
1225                 return L2D;
1226         else if (strncmp(model, "L8", 2) == 0)
1227                 return S1x;
1228         else if (strncmp(model, "D1", 2) == 0)
1229                 return D1x;
1230         else if (strncmp(model, "A1", 2) == 0)
1231                 return A1x;
1232         else if (strncmp(model, "A2", 2) == 0)
1233                 return A2x;
1234         else if (strncmp(model, "J1", 2) == 0)
1235                 return S2x;
1236         else if (strncmp(model, "L5", 2) == 0)
1237                 return L5x;
1238         else if (strncmp(model, "A4G", 3) == 0)
1239                 return A4G;
1240         else if (strncmp(model, "W1N", 3) == 0)
1241                 return W1N;
1242         else if (strncmp(model, "W3V", 3) == 0)
1243                 return W3V;
1244         else if (strncmp(model, "W5A", 3) == 0)
1245                 return W5A;
1246         else if (strncmp(model, "R1F", 3) == 0)
1247                 return R1F;
1248         else if (strncmp(model, "A4S", 3) == 0)
1249                 return A4S;
1250         else if (strncmp(model, "F3Sa", 4) == 0)
1251                 return F3Sa;
1252         else
1253                 return END_MODEL;
1254 }
1255
1256 /*
1257  * This function is used to initialize the hotk with right values. In this
1258  * method, we can make all the detection we want, and modify the hotk struct
1259  */
1260 static int asus_hotk_get_info(void)
1261 {
1262         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1263         union acpi_object *model = NULL;
1264         int bsts_result;
1265         char *string = NULL;
1266         acpi_status status;
1267
1268         /*
1269          * Get DSDT headers early enough to allow for differentiating between
1270          * models, but late enough to allow acpi_bus_register_driver() to fail
1271          * before doing anything ACPI-specific. Should we encounter a machine,
1272          * which needs special handling (i.e. its hotkey device has a different
1273          * HID), this bit will be moved. A global variable asus_info contains
1274          * the DSDT header.
1275          */
1276         status = acpi_get_table(ACPI_SIG_DSDT, 1, &asus_info);
1277         if (ACPI_FAILURE(status))
1278                 pr_warn("  Couldn't get the DSDT table header\n");
1279
1280         /* We have to write 0 on init this far for all ASUS models */
1281         if (!write_acpi_int(hotk->handle, "INIT", 0, &buffer)) {
1282                 pr_err("  Hotkey initialization failed\n");
1283                 return -ENODEV;
1284         }
1285
1286         /* This needs to be called for some laptops to init properly */
1287         if (!read_acpi_int(hotk->handle, "BSTS", &bsts_result))
1288                 pr_warn("  Error calling BSTS\n");
1289         else if (bsts_result)
1290                 pr_notice("  BSTS called, 0x%02x returned\n", bsts_result);
1291
1292         /*
1293          * Try to match the object returned by INIT to the specific model.
1294          * Handle every possible object (or the lack of thereof) the DSDT
1295          * writers might throw at us. When in trouble, we pass NULL to
1296          * asus_model_match() and try something completely different.
1297          */
1298         if (buffer.pointer) {
1299                 model = buffer.pointer;
1300                 switch (model->type) {
1301                 case ACPI_TYPE_STRING:
1302                         string = model->string.pointer;
1303                         break;
1304                 case ACPI_TYPE_BUFFER:
1305                         string = model->buffer.pointer;
1306                         break;
1307                 default:
1308                         kfree(model);
1309                         model = NULL;
1310                         break;
1311                 }
1312         }
1313         hotk->model = asus_model_match(string);
1314         if (hotk->model == END_MODEL) { /* match failed */
1315                 if (asus_info &&
1316                     strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) {
1317                         hotk->model = P30;
1318                         pr_notice("  Samsung P30 detected, supported\n");
1319                         hotk->methods = &model_conf[hotk->model];
1320                         kfree(model);
1321                         return 0;
1322                 } else {
1323                         hotk->model = M2E;
1324                         pr_notice("  unsupported model %s, trying default values\n",
1325                                   string);
1326                         pr_notice("  send /proc/acpi/dsdt to the developers\n");
1327                         kfree(model);
1328                         return -ENODEV;
1329                 }
1330         }
1331         hotk->methods = &model_conf[hotk->model];
1332         pr_notice("  %s model detected, supported\n", string);
1333
1334         /* Sort of per-model blacklist */
1335         if (strncmp(string, "L2B", 3) == 0)
1336                 hotk->methods->lcd_status = NULL;
1337         /* L2B is similar enough to L3C to use its settings, with this only
1338            exception */
1339         else if (strncmp(string, "A3G", 3) == 0)
1340                 hotk->methods->lcd_status = "\\BLFG";
1341         /* A3G is like M6R */
1342         else if (strncmp(string, "S5N", 3) == 0 ||
1343                  strncmp(string, "M5N", 3) == 0 ||
1344                  strncmp(string, "W3N", 3) == 0)
1345                 hotk->methods->mt_mled = NULL;
1346         /* S5N, M5N and W3N have no MLED */
1347         else if (strncmp(string, "L5D", 3) == 0)
1348                 hotk->methods->mt_wled = NULL;
1349         /* L5D's WLED is not controlled by ACPI */
1350         else if (strncmp(string, "M2N", 3) == 0 ||
1351                  strncmp(string, "W3V", 3) == 0 ||
1352                  strncmp(string, "S1N", 3) == 0)
1353                 hotk->methods->mt_wled = "WLED";
1354         /* M2N, S1N and W3V have a usable WLED */
1355         else if (asus_info) {
1356                 if (strncmp(asus_info->oem_table_id, "L1", 2) == 0)
1357                         hotk->methods->mled_status = NULL;
1358                 /* S1300A reports L84F, but L1400B too, account for that */
1359         }
1360
1361         kfree(model);
1362
1363         return 0;
1364 }
1365
1366 static int asus_hotk_check(void)
1367 {
1368         int result = 0;
1369
1370         result = acpi_bus_get_status(hotk->device);
1371         if (result)
1372                 return result;
1373
1374         if (hotk->device->status.present) {
1375                 result = asus_hotk_get_info();
1376         } else {
1377                 pr_err("  Hotkey device not present, aborting\n");
1378                 return -EINVAL;
1379         }
1380
1381         return result;
1382 }
1383
1384 static int asus_hotk_found;
1385
1386 static int asus_hotk_add(struct acpi_device *device)
1387 {
1388         acpi_status status = AE_OK;
1389         int result;
1390
1391         pr_notice("Asus Laptop ACPI Extras version %s\n", ASUS_ACPI_VERSION);
1392
1393         hotk = kzalloc(sizeof(struct asus_hotk), GFP_KERNEL);
1394         if (!hotk)
1395                 return -ENOMEM;
1396
1397         hotk->handle = device->handle;
1398         strcpy(acpi_device_name(device), ACPI_HOTK_DEVICE_NAME);
1399         strcpy(acpi_device_class(device), ACPI_HOTK_CLASS);
1400         device->driver_data = hotk;
1401         hotk->device = device;
1402
1403         result = asus_hotk_check();
1404         if (result)
1405                 goto end;
1406
1407         result = asus_hotk_add_fs(device);
1408         if (result)
1409                 goto end;
1410
1411         /* For laptops without GPLV: init the hotk->brightness value */
1412         if ((!hotk->methods->brightness_get)
1413             && (!hotk->methods->brightness_status)
1414             && (hotk->methods->brightness_up && hotk->methods->brightness_down)) {
1415                 status =
1416                     acpi_evaluate_object(NULL, hotk->methods->brightness_down,
1417                                          NULL, NULL);
1418                 if (ACPI_FAILURE(status))
1419                         pr_warn("  Error changing brightness\n");
1420                 else {
1421                         status =
1422                             acpi_evaluate_object(NULL,
1423                                                  hotk->methods->brightness_up,
1424                                                  NULL, NULL);
1425                         if (ACPI_FAILURE(status))
1426                                 pr_warn("  Strange, error changing brightness\n");
1427                 }
1428         }
1429
1430         asus_hotk_found = 1;
1431
1432         /* LED display is off by default */
1433         hotk->ledd_status = 0xFFF;
1434
1435 end:
1436         if (result)
1437                 kfree(hotk);
1438
1439         return result;
1440 }
1441
1442 static int asus_hotk_remove(struct acpi_device *device, int type)
1443 {
1444         asus_hotk_remove_fs(device);
1445
1446         kfree(hotk);
1447
1448         return 0;
1449 }
1450
1451 static const struct backlight_ops asus_backlight_data = {
1452         .get_brightness = read_brightness,
1453         .update_status  = set_brightness_status,
1454 };
1455
1456 static void asus_acpi_exit(void)
1457 {
1458         if (asus_backlight_device)
1459                 backlight_device_unregister(asus_backlight_device);
1460
1461         acpi_bus_unregister_driver(&asus_hotk_driver);
1462         remove_proc_entry(PROC_ASUS, acpi_root_dir);
1463
1464         return;
1465 }
1466
1467 static int __init asus_acpi_init(void)
1468 {
1469         struct backlight_properties props;
1470         int result;
1471
1472         result = acpi_bus_register_driver(&asus_hotk_driver);
1473         if (result < 0)
1474                 return result;
1475
1476         asus_proc_dir = proc_mkdir(PROC_ASUS, acpi_root_dir);
1477         if (!asus_proc_dir) {
1478                 pr_err("Unable to create /proc entry\n");
1479                 acpi_bus_unregister_driver(&asus_hotk_driver);
1480                 return -ENODEV;
1481         }
1482
1483         /*
1484          * This is a bit of a kludge.  We only want this module loaded
1485          * for ASUS systems, but there's currently no way to probe the
1486          * ACPI namespace for ASUS HIDs.  So we just return failure if
1487          * we didn't find one, which will cause the module to be
1488          * unloaded.
1489          */
1490         if (!asus_hotk_found) {
1491                 acpi_bus_unregister_driver(&asus_hotk_driver);
1492                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1493                 return -ENODEV;
1494         }
1495
1496         memset(&props, 0, sizeof(struct backlight_properties));
1497         props.type = BACKLIGHT_PLATFORM;
1498         props.max_brightness = 15;
1499         asus_backlight_device = backlight_device_register("asus", NULL, NULL,
1500                                                           &asus_backlight_data,
1501                                                           &props);
1502         if (IS_ERR(asus_backlight_device)) {
1503                 pr_err("Could not register asus backlight device\n");
1504                 asus_backlight_device = NULL;
1505                 asus_acpi_exit();
1506                 return -ENODEV;
1507         }
1508
1509         return 0;
1510 }
1511
1512 module_init(asus_acpi_init);
1513 module_exit(asus_acpi_exit);