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         .owner = THIS_MODULE,
 470         .ids = asus_device_ids,
 471         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
 472         .ops = {
 473                 .add = asus_hotk_add,
 474                 .remove = asus_hotk_remove,
 475                 .notify = asus_hotk_notify,
 476                 },
 477 };
 478
 479 /*
 480  * This function evaluates an ACPI method, given an int as parameter, the
 481  * method is searched within the scope of the handle, can be NULL. The output
 482  * of the method is written is output, which can also be NULL
 483  *
 484  * returns 1 if write is successful, 0 else.
 485  */
 486 static int write_acpi_int(acpi_handle handle, const char *method, int val,
 487                           struct acpi_buffer *output)
 488 {
 489         struct acpi_object_list params; /* list of input parameters (int) */
 490         union acpi_object in_obj;       /* the only param we use */
 491         acpi_status status;
 492
 493         params.count = 1;
 494         params.pointer = &in_obj;
 495         in_obj.type = ACPI_TYPE_INTEGER;
 496         in_obj.integer.value = val;
 497
 498         status = acpi_evaluate_object(handle, (char *)method, &params, output);
 499         return (status == AE_OK);
 500 }
 501
 502 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
 503 {
 504         struct acpi_buffer output;
 505         union acpi_object out_obj;
 506         acpi_status status;
 507
 508         output.length = sizeof(out_obj);
 509         output.pointer = &out_obj;
 510
 511         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
 512         *val = out_obj.integer.value;
 513         return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
 514 }
 515
 516 /*
 517  * We write our info in page, we begin at offset off and cannot write more
 518  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 519  * number of bytes written in page
 520  */
 521 static int
 522 proc_read_info(char *page, char **start, off_t off, int count, int *eof,
 523                void *data)
 524 {
 525         int len = 0;
 526         int temp;
 527         char buf[16];           /* enough for all info */
 528         /*
 529          * We use the easy way, we don't care of off and count,
 530          * so we don't set eof to 1
 531          */
 532
 533         len += sprintf(page, ACPI_HOTK_NAME " " ASUS_ACPI_VERSION "\n");
 534         len += sprintf(page + len, "Model reference    : %s\n",
 535                        hotk->methods->name);
 536         /*
 537          * The SFUN method probably allows the original driver to get the list
 538          * of features supported by a given model. For now, 0x0100 or 0x0800
 539          * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
 540          * The significance of others is yet to be found.
 541          */
 542         if (read_acpi_int(hotk->handle, "SFUN", &temp))
 543                 len +=
 544                     sprintf(page + len, "SFUN value         : 0x%04x\n", temp);
 545         /*
 546          * Another value for userspace: the ASYM method returns 0x02 for
 547          * battery low and 0x04 for battery critical, its readings tend to be
 548          * more accurate than those provided by _BST.
 549          * Note: since not all the laptops provide this method, errors are
 550          * silently ignored.
 551          */
 552         if (read_acpi_int(hotk->handle, "ASYM", &temp))
 553                 len +=
 554                     sprintf(page + len, "ASYM value         : 0x%04x\n", temp);
 555         if (asus_info) {
 556                 snprintf(buf, 16, "%d", asus_info->length);
 557                 len += sprintf(page + len, "DSDT length        : %s\n", buf);
 558                 snprintf(buf, 16, "%d", asus_info->checksum);
 559                 len += sprintf(page + len, "DSDT checksum      : %s\n", buf);
 560                 snprintf(buf, 16, "%d", asus_info->revision);
 561                 len += sprintf(page + len, "DSDT revision      : %s\n", buf);
 562                 snprintf(buf, 7, "%s", asus_info->oem_id);
 563                 len += sprintf(page + len, "OEM id             : %s\n", buf);
 564                 snprintf(buf, 9, "%s", asus_info->oem_table_id);
 565                 len += sprintf(page + len, "OEM table id       : %s\n", buf);
 566                 snprintf(buf, 16, "%x", asus_info->oem_revision);
 567                 len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);
 568                 snprintf(buf, 5, "%s", asus_info->asl_compiler_id);
 569                 len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
 570                 snprintf(buf, 16, "%x", asus_info->asl_compiler_revision);
 571                 len += sprintf(page + len, "ASL comp revision  : 0x%s\n", buf);
 572         }
 573
 574         return len;
 575 }
 576
 577 /*
 578  * /proc handlers
 579  * We write our info in page, we begin at offset off and cannot write more
 580  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 581  * number of bytes written in page
 582  */
 583
 584 /* Generic LED functions */
 585 static int read_led(const char *ledname, int ledmask)
 586 {
 587         if (ledname) {
 588                 int led_status;
 589
 590                 if (read_acpi_int(NULL, ledname, &led_status))
 591                         return led_status;
 592                 else
 593                         printk(KERN_WARNING "Asus ACPI: Error reading LED "
 594                                "status\n");
 595         }
 596         return (hotk->status & ledmask) ? 1 : 0;
 597 }
 598
 599 static int parse_arg(const char __user *buf, unsigned long count, int *val)
 600 {
 601         char s[32];
 602         if (!count)
 603                 return 0;
 604         if (count > 31)
 605                 return -EINVAL;
 606         if (copy_from_user(s, buf, count))
 607                 return -EFAULT;
 608         s[count] = 0;
 609         if (sscanf(s, "%i", val) != 1)
 610                 return -EINVAL;
 611         return count;
 612 }
 613
 614 /* FIXME: kill extraneous args so it can be called independently */
 615 static int
 616 write_led(const char __user *buffer, unsigned long count,
 617           char *ledname, int ledmask, int invert)
 618 {
 619         int rv, value;
 620         int led_out = 0;
 621
 622         rv = parse_arg(buffer, count, &value);
 623         if (rv > 0)
 624                 led_out = value ? 1 : 0;
 625
 626         hotk->status =
 627             (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);
 628
 629         if (invert)             /* invert target value */
 630                 led_out = !led_out;
 631
 632         if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
 633                 printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",
 634                        ledname);
 635
 636         return rv;
 637 }
 638
 639 /*
 640  * Proc handlers for MLED
 641  */
 642 static int
 643 proc_read_mled(char *page, char **start, off_t off, int count, int *eof,
 644                void *data)
 645 {
 646         return sprintf(page, "%d\n",
 647                        read_led(hotk->methods->mled_status, MLED_ON));
 648 }
 649
 650 static int
 651 proc_write_mled(struct file *file, const char __user *buffer,
 652                 unsigned long count, void *data)
 653 {
 654         return write_led(buffer, count, hotk->methods->mt_mled, MLED_ON, 1);
 655 }
 656
 657 /*
 658  * Proc handlers for LED display
 659  */
 660 static int
 661 proc_read_ledd(char *page, char **start, off_t off, int count, int *eof,
 662                void *data)
 663 {
 664         return sprintf(page, "0x%08x\n", hotk->ledd_status);
 665 }
 666
 667 static int
 668 proc_write_ledd(struct file *file, const char __user *buffer,
 669                 unsigned long count, void *data)
 670 {
 671         int rv, value;
 672
 673         rv = parse_arg(buffer, count, &value);
 674         if (rv > 0) {
 675                 if (!write_acpi_int
 676                     (hotk->handle, hotk->methods->mt_ledd, value, NULL))
 677                         printk(KERN_WARNING
 678                                "Asus ACPI: LED display write failed\n");
 679                 else
 680                         hotk->ledd_status = (u32) value;
 681         }
 682         return rv;
 683 }
 684
 685 /*
 686  * Proc handlers for WLED
 687  */
 688 static int
 689 proc_read_wled(char *page, char **start, off_t off, int count, int *eof,
 690                void *data)
 691 {
 692         return sprintf(page, "%d\n",
 693                        read_led(hotk->methods->wled_status, WLED_ON));
 694 }
 695
 696 static int
 697 proc_write_wled(struct file *file, const char __user *buffer,
 698                 unsigned long count, void *data)
 699 {
 700         return write_led(buffer, count, hotk->methods->mt_wled, WLED_ON, 0);
 701 }
 702
 703 /*
 704  * Proc handlers for Bluetooth
 705  */
 706 static int
 707 proc_read_bluetooth(char *page, char **start, off_t off, int count, int *eof,
 708                     void *data)
 709 {
 710         return sprintf(page, "%d\n", read_led(hotk->methods->bt_status, BT_ON));
 711 }
 712
 713 static int
 714 proc_write_bluetooth(struct file *file, const char __user *buffer,
 715                      unsigned long count, void *data)
 716 {
 717         /* Note: mt_bt_switch controls both internal Bluetooth adapter's
 718            presence and its LED */
 719         return write_led(buffer, count, hotk->methods->mt_bt_switch, BT_ON, 0);
 720 }
 721
 722 /*
 723  * Proc handlers for TLED
 724  */
 725 static int
 726 proc_read_tled(char *page, char **start, off_t off, int count, int *eof,
 727                void *data)
 728 {
 729         return sprintf(page, "%d\n",
 730                        read_led(hotk->methods->tled_status, TLED_ON));
 731 }
 732
 733 static int
 734 proc_write_tled(struct file *file, const char __user *buffer,
 735                 unsigned long count, void *data)
 736 {
 737         return write_led(buffer, count, hotk->methods->mt_tled, TLED_ON, 0);
 738 }
 739
 740 static int get_lcd_state(void)
 741 {
 742         int lcd = 0;
 743
 744         if (hotk->model == L3H) {
 745                 /* L3H and the like have to be handled differently */
 746                 acpi_status status = 0;
 747                 struct acpi_object_list input;
 748                 union acpi_object mt_params[2];
 749                 struct acpi_buffer output;
 750                 union acpi_object out_obj;
 751
 752                 input.count = 2;
 753                 input.pointer = mt_params;
 754                 /* Note: the following values are partly guessed up, but
 755                    otherwise they seem to work */
 756                 mt_params[0].type = ACPI_TYPE_INTEGER;
 757                 mt_params[0].integer.value = 0x02;
 758                 mt_params[1].type = ACPI_TYPE_INTEGER;
 759                 mt_params[1].integer.value = 0x02;
 760
 761                 output.length = sizeof(out_obj);
 762                 output.pointer = &out_obj;
 763
 764                 status =
 765                     acpi_evaluate_object(NULL, hotk->methods->lcd_status,
 766                                          &input, &output);
 767                 if (status != AE_OK)
 768                         return -1;
 769                 if (out_obj.type == ACPI_TYPE_INTEGER)
 770                         /* That's what the AML code does */
 771                         lcd = out_obj.integer.value >> 8;
 772         } else if (hotk->model == F3Sa) {
 773                 unsigned long long tmp;
 774                 union acpi_object param;
 775                 struct acpi_object_list input;
 776                 acpi_status status;
 777
 778                 /* Read pin 11 */
 779                 param.type = ACPI_TYPE_INTEGER;
 780                 param.integer.value = 0x11;
 781                 input.count = 1;
 782                 input.pointer = &param;
 783
 784                 status = acpi_evaluate_integer(NULL, hotk->methods->lcd_status,
 785                                                 &input, &tmp);
 786                 if (status != AE_OK)
 787                         return -1;
 788
 789                 lcd = tmp;
 790         } else {
 791                 /* We don't have to check anything if we are here */
 792                 if (!read_acpi_int(NULL, hotk->methods->lcd_status, &lcd))
 793                         printk(KERN_WARNING
 794                                "Asus ACPI: Error reading LCD status\n");
 795
 796                 if (hotk->model == L2D)
 797                         lcd = ~lcd;
 798         }
 799
 800         return (lcd & 1);
 801 }
 802
 803 static int set_lcd_state(int value)
 804 {
 805         int lcd = 0;
 806         acpi_status status = 0;
 807
 808         lcd = value ? 1 : 0;
 809         if (lcd != get_lcd_state()) {
 810                 /* switch */
 811                 if (hotk->model != L3H) {
 812                         status =
 813                             acpi_evaluate_object(NULL,
 814                                                  hotk->methods->mt_lcd_switch,
 815                                                  NULL, NULL);
 816                 } else {
 817                         /* L3H and the like must be handled differently */
 818                         if (!write_acpi_int
 819                             (hotk->handle, hotk->methods->mt_lcd_switch, 0x07,
 820                              NULL))
 821                                 status = AE_ERROR;
 822                         /* L3H's AML executes EHK (0x07) upon Fn+F7 keypress,
 823                            the exact behaviour is simulated here */
 824                 }
 825                 if (ACPI_FAILURE(status))
 826                         printk(KERN_WARNING "Asus ACPI: Error switching LCD\n");
 827         }
 828         return 0;
 829
 830 }
 831
 832 static int
 833 proc_read_lcd(char *page, char **start, off_t off, int count, int *eof,
 834               void *data)
 835 {
 836         return sprintf(page, "%d\n", get_lcd_state());
 837 }
 838
 839 static int
 840 proc_write_lcd(struct file *file, const char __user *buffer,
 841                unsigned long count, void *data)
 842 {
 843         int rv, value;
 844
 845         rv = parse_arg(buffer, count, &value);
 846         if (rv > 0)
 847                 set_lcd_state(value);
 848         return rv;
 849 }
 850
 851 static int read_brightness(struct backlight_device *bd)
 852 {
 853         int value;
 854
 855         if (hotk->methods->brightness_get) {    /* SPLV/GPLV laptop */
 856                 if (!read_acpi_int(hotk->handle, hotk->methods->brightness_get,
 857                                    &value))
 858                         printk(KERN_WARNING
 859                                "Asus ACPI: Error reading brightness\n");
 860         } else if (hotk->methods->brightness_status) {  /* For D1 for example */
 861                 if (!read_acpi_int(NULL, hotk->methods->brightness_status,
 862                                    &value))
 863                         printk(KERN_WARNING
 864                                "Asus ACPI: Error reading brightness\n");
 865         } else                  /* No GPLV method */
 866                 value = hotk->brightness;
 867         return value;
 868 }
 869
 870 /*
 871  * Change the brightness level
 872  */
 873 static int set_brightness(int value)
 874 {
 875         acpi_status status = 0;
 876         int ret = 0;
 877
 878         /* SPLV laptop */
 879         if (hotk->methods->brightness_set) {
 880                 if (!write_acpi_int(hotk->handle, hotk->methods->brightness_set,
 881                                     value, NULL))
 882                         printk(KERN_WARNING
 883                                "Asus ACPI: Error changing brightness\n");
 884                         ret = -EIO;
 885                 goto out;
 886         }
 887
 888         /* No SPLV method if we are here, act as appropriate */
 889         value -= read_brightness(NULL);
 890         while (value != 0) {
 891                 status = acpi_evaluate_object(NULL, (value > 0) ?
 892                                               hotk->methods->brightness_up :
 893                                               hotk->methods->brightness_down,
 894                                               NULL, NULL);
 895                 (value > 0) ? value-- : value++;
 896                 if (ACPI_FAILURE(status))
 897                         printk(KERN_WARNING
 898                                "Asus ACPI: Error changing brightness\n");
 899                         ret = -EIO;
 900         }
 901 out:
 902         return ret;
 903 }
 904
 905 static int set_brightness_status(struct backlight_device *bd)
 906 {
 907         return set_brightness(bd->props.brightness);
 908 }
 909
 910 static int
 911 proc_read_brn(char *page, char **start, off_t off, int count, int *eof,
 912               void *data)
 913 {
 914         return sprintf(page, "%d\n", read_brightness(NULL));
 915 }
 916
 917 static int
 918 proc_write_brn(struct file *file, const char __user *buffer,
 919                unsigned long count, void *data)
 920 {
 921         int rv, value;
 922
 923         rv = parse_arg(buffer, count, &value);
 924         if (rv > 0) {
 925                 value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
 926                 /* 0 <= value <= 15 */
 927                 set_brightness(value);
 928         }
 929         return rv;
 930 }
 931
 932 static void set_display(int value)
 933 {
 934         /* no sanity check needed for now */
 935         if (!write_acpi_int(hotk->handle, hotk->methods->display_set,
 936                             value, NULL))
 937                 printk(KERN_WARNING "Asus ACPI: Error setting display\n");
 938         return;
 939 }
 940
 941 /*
 942  * Now, *this* one could be more user-friendly, but so far, no-one has
 943  * complained. The significance of bits is the same as in proc_write_disp()
 944  */
 945 static int
 946 proc_read_disp(char *page, char **start, off_t off, int count, int *eof,
 947                void *data)
 948 {
 949         int value = 0;
 950
 951         if (!read_acpi_int(hotk->handle, hotk->methods->display_get, &value))
 952                 printk(KERN_WARNING
 953                        "Asus ACPI: Error reading display status\n");
 954         value &= 0x07;  /* needed for some models, shouldn't hurt others */
 955         return sprintf(page, "%d\n", value);
 956 }
 957
 958 /*
 959  * Experimental support for display switching. As of now: 1 should activate
 960  * the LCD output, 2 should do for CRT, and 4 for TV-Out. Any combination
 961  * (bitwise) of these will suffice. I never actually tested 3 displays hooked
 962  * up simultaneously, so be warned. See the acpi4asus README for more info.
 963  */
 964 static int
 965 proc_write_disp(struct file *file, const char __user *buffer,
 966                 unsigned long count, void *data)
 967 {
 968         int rv, value;
 969
 970         rv = parse_arg(buffer, count, &value);
 971         if (rv > 0)
 972                 set_display(value);
 973         return rv;
 974 }
 975
 976 typedef int (proc_readfunc) (char *page, char **start, off_t off, int count,
 977                              int *eof, void *data);
 978 typedef int (proc_writefunc) (struct file *file, const char __user *buffer,
 979                               unsigned long count, void *data);
 980
 981 static int
 982 asus_proc_add(char *name, proc_writefunc *writefunc,
 983                      proc_readfunc *readfunc, mode_t mode,
 984                      struct acpi_device *device)
 985 {
 986         struct proc_dir_entry *proc =
 987             create_proc_entry(name, mode, acpi_device_dir(device));
 988         if (!proc) {
 989                 printk(KERN_WARNING "  Unable to create %s fs entry\n", name);
 990                 return -1;
 991         }
 992         proc->write_proc = writefunc;
 993         proc->read_proc = readfunc;
 994         proc->data = acpi_driver_data(device);
 995         proc->uid = asus_uid;
 996         proc->gid = asus_gid;
 997         return 0;
 998 }
 999
1000 static int asus_hotk_add_fs(struct acpi_device *device)
1001 {
1002         struct proc_dir_entry *proc;
1003         mode_t mode;
1004
1005         /*
1006          * If parameter uid or gid is not changed, keep the default setting for
1007          * our proc entries (-rw-rw-rw-) else, it means we care about security,
1008          * and then set to -rw-rw----
1009          */
1010
1011         if ((asus_uid == 0) && (asus_gid == 0)) {
1012                 mode = S_IFREG | S_IRUGO | S_IWUGO;
1013         } else {
1014                 mode = S_IFREG | S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
1015                 printk(KERN_WARNING "  asus_uid and asus_gid parameters are "
1016                        "deprecated, use chown and chmod instead!\n");
1017         }
1018
1019         acpi_device_dir(device) = asus_proc_dir;
1020         if (!acpi_device_dir(device))
1021                 return -ENODEV;
1022
1023         proc = create_proc_entry(PROC_INFO, mode, acpi_device_dir(device));
1024         if (proc) {
1025                 proc->read_proc = proc_read_info;
1026                 proc->data = acpi_driver_data(device);
1027                 proc->uid = asus_uid;
1028                 proc->gid = asus_gid;
1029         } else {
1030                 printk(KERN_WARNING "  Unable to create " PROC_INFO
1031                        " fs entry\n");
1032         }
1033
1034         if (hotk->methods->mt_wled) {
1035                 asus_proc_add(PROC_WLED, &proc_write_wled, &proc_read_wled,
1036                               mode, device);
1037         }
1038
1039         if (hotk->methods->mt_ledd) {
1040                 asus_proc_add(PROC_LEDD, &proc_write_ledd, &proc_read_ledd,
1041                               mode, device);
1042         }
1043
1044         if (hotk->methods->mt_mled) {
1045                 asus_proc_add(PROC_MLED, &proc_write_mled, &proc_read_mled,
1046                               mode, device);
1047         }
1048
1049         if (hotk->methods->mt_tled) {
1050                 asus_proc_add(PROC_TLED, &proc_write_tled, &proc_read_tled,
1051                               mode, device);
1052         }
1053
1054         if (hotk->methods->mt_bt_switch) {
1055                 asus_proc_add(PROC_BT, &proc_write_bluetooth,
1056                               &proc_read_bluetooth, mode, device);
1057         }
1058
1059         /*
1060          * We need both read node and write method as LCD switch is also
1061          * accessible from the keyboard
1062          */
1063         if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status) {
1064                 asus_proc_add(PROC_LCD, &proc_write_lcd, &proc_read_lcd, mode,
1065                               device);
1066         }
1067
1068         if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
1069             (hotk->methods->brightness_get && hotk->methods->brightness_set)) {
1070                 asus_proc_add(PROC_BRN, &proc_write_brn, &proc_read_brn, mode,
1071                               device);
1072         }
1073
1074         if (hotk->methods->display_set) {
1075                 asus_proc_add(PROC_DISP, &proc_write_disp, &proc_read_disp,
1076                               mode, device);
1077         }
1078
1079         return 0;
1080 }
1081
1082 static int asus_hotk_remove_fs(struct acpi_device *device)
1083 {
1084         if (acpi_device_dir(device)) {
1085                 remove_proc_entry(PROC_INFO, acpi_device_dir(device));
1086                 if (hotk->methods->mt_wled)
1087                         remove_proc_entry(PROC_WLED, acpi_device_dir(device));
1088                 if (hotk->methods->mt_mled)
1089                         remove_proc_entry(PROC_MLED, acpi_device_dir(device));
1090                 if (hotk->methods->mt_tled)
1091                         remove_proc_entry(PROC_TLED, acpi_device_dir(device));
1092                 if (hotk->methods->mt_ledd)
1093                         remove_proc_entry(PROC_LEDD, acpi_device_dir(device));
1094                 if (hotk->methods->mt_bt_switch)
1095                         remove_proc_entry(PROC_BT, acpi_device_dir(device));
1096                 if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status)
1097                         remove_proc_entry(PROC_LCD, acpi_device_dir(device));
1098                 if ((hotk->methods->brightness_up
1099                      && hotk->methods->brightness_down)
1100                     || (hotk->methods->brightness_get
1101                         && hotk->methods->brightness_set))
1102                         remove_proc_entry(PROC_BRN, acpi_device_dir(device));
1103                 if (hotk->methods->display_set)
1104                         remove_proc_entry(PROC_DISP, acpi_device_dir(device));
1105         }
1106         return 0;
1107 }
1108
1109 static void asus_hotk_notify(struct acpi_device *device, u32 event)
1110 {
1111         /* TODO Find a better way to handle events count. */
1112         if (!hotk)
1113                 return;
1114
1115         /*
1116          * The BIOS *should* be sending us device events, but apparently
1117          * Asus uses system events instead, so just ignore any device
1118          * events we get.
1119          */
1120         if (event > ACPI_MAX_SYS_NOTIFY)
1121                 return;
1122
1123         if ((event & ~((u32) BR_UP)) < 16)
1124                 hotk->brightness = (event & ~((u32) BR_UP));
1125         else if ((event & ~((u32) BR_DOWN)) < 16)
1126                 hotk->brightness = (event & ~((u32) BR_DOWN));
1127
1128         acpi_bus_generate_proc_event(hotk->device, event,
1129                                 hotk->event_count[event % 128]++);
1130
1131         return;
1132 }
1133
1134 /*
1135  * Match the model string to the list of supported models. Return END_MODEL if
1136  * no match or model is NULL.
1137  */
1138 static int asus_model_match(char *model)
1139 {
1140         if (model == NULL)
1141                 return END_MODEL;
1142
1143         if (strncmp(model, "L3D", 3) == 0)
1144                 return L3D;
1145         else if (strncmp(model, "L2E", 3) == 0 ||
1146                  strncmp(model, "L3H", 3) == 0 || strncmp(model, "L5D", 3) == 0)
1147                 return L3H;
1148         else if (strncmp(model, "L3", 2) == 0 || strncmp(model, "L2B", 3) == 0)
1149                 return L3C;
1150         else if (strncmp(model, "L8L", 3) == 0)
1151                 return L8L;
1152         else if (strncmp(model, "L4R", 3) == 0)
1153                 return L4R;
1154         else if (strncmp(model, "M6N", 3) == 0 || strncmp(model, "W3N", 3) == 0)
1155                 return M6N;
1156         else if (strncmp(model, "M6R", 3) == 0 || strncmp(model, "A3G", 3) == 0)
1157                 return M6R;
1158         else if (strncmp(model, "M2N", 3) == 0 ||
1159                  strncmp(model, "M3N", 3) == 0 ||
1160                  strncmp(model, "M5N", 3) == 0 ||
1161                  strncmp(model, "M6N", 3) == 0 ||
1162                  strncmp(model, "S1N", 3) == 0 ||
1163                  strncmp(model, "S5N", 3) == 0 || strncmp(model, "W1N", 3) == 0)
1164                 return xxN;
1165         else if (strncmp(model, "M1", 2) == 0)
1166                 return M1A;
1167         else if (strncmp(model, "M2", 2) == 0 || strncmp(model, "L4E", 3) == 0)
1168                 return M2E;
1169         else if (strncmp(model, "L2", 2) == 0)
1170                 return L2D;
1171         else if (strncmp(model, "L8", 2) == 0)
1172                 return S1x;
1173         else if (strncmp(model, "D1", 2) == 0)
1174                 return D1x;
1175         else if (strncmp(model, "A1", 2) == 0)
1176                 return A1x;
1177         else if (strncmp(model, "A2", 2) == 0)
1178                 return A2x;
1179         else if (strncmp(model, "J1", 2) == 0)
1180                 return S2x;
1181         else if (strncmp(model, "L5", 2) == 0)
1182                 return L5x;
1183         else if (strncmp(model, "A4G", 3) == 0)
1184                 return A4G;
1185         else if (strncmp(model, "W1N", 3) == 0)
1186                 return W1N;
1187         else if (strncmp(model, "W3V", 3) == 0)
1188                 return W3V;
1189         else if (strncmp(model, "W5A", 3) == 0)
1190                 return W5A;
1191         else if (strncmp(model, "R1F", 3) == 0)
1192                 return R1F;
1193         else if (strncmp(model, "A4S", 3) == 0)
1194                 return A4S;
1195         else if (strncmp(model, "F3Sa", 4) == 0)
1196                 return F3Sa;
1197         else
1198                 return END_MODEL;
1199 }
1200
1201 /*
1202  * This function is used to initialize the hotk with right values. In this
1203  * method, we can make all the detection we want, and modify the hotk struct
1204  */
1205 static int asus_hotk_get_info(void)
1206 {
1207         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1208         union acpi_object *model = NULL;
1209         int bsts_result;
1210         char *string = NULL;
1211         acpi_status status;
1212
1213         /*
1214          * Get DSDT headers early enough to allow for differentiating between
1215          * models, but late enough to allow acpi_bus_register_driver() to fail
1216          * before doing anything ACPI-specific. Should we encounter a machine,
1217          * which needs special handling (i.e. its hotkey device has a different
1218          * HID), this bit will be moved. A global variable asus_info contains
1219          * the DSDT header.
1220          */
1221         status = acpi_get_table(ACPI_SIG_DSDT, 1, &asus_info);
1222         if (ACPI_FAILURE(status))
1223                 printk(KERN_WARNING "  Couldn't get the DSDT table header\n");
1224
1225         /* We have to write 0 on init this far for all ASUS models */
1226         if (!write_acpi_int(hotk->handle, "INIT", 0, &buffer)) {
1227                 printk(KERN_ERR "  Hotkey initialization failed\n");
1228                 return -ENODEV;
1229         }
1230
1231         /* This needs to be called for some laptops to init properly */
1232         if (!read_acpi_int(hotk->handle, "BSTS", &bsts_result))
1233                 printk(KERN_WARNING "  Error calling BSTS\n");
1234         else if (bsts_result)
1235                 printk(KERN_NOTICE "  BSTS called, 0x%02x returned\n",
1236                        bsts_result);
1237
1238         /*
1239          * Try to match the object returned by INIT to the specific model.
1240          * Handle every possible object (or the lack of thereof) the DSDT
1241          * writers might throw at us. When in trouble, we pass NULL to
1242          * asus_model_match() and try something completely different.
1243          */
1244         if (buffer.pointer) {
1245                 model = buffer.pointer;
1246                 switch (model->type) {
1247                 case ACPI_TYPE_STRING:
1248                         string = model->string.pointer;
1249                         break;
1250                 case ACPI_TYPE_BUFFER:
1251                         string = model->buffer.pointer;
1252                         break;
1253                 default:
1254                         kfree(model);
1255                         model = NULL;
1256                         break;
1257                 }
1258         }
1259         hotk->model = asus_model_match(string);
1260         if (hotk->model == END_MODEL) { /* match failed */
1261                 if (asus_info &&
1262                     strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) {
1263                         hotk->model = P30;
1264                         printk(KERN_NOTICE
1265                                "  Samsung P30 detected, supported\n");
1266                 } else {
1267                         hotk->model = M2E;
1268                         printk(KERN_NOTICE "  unsupported model %s, trying "
1269                                "default values\n", string);
1270                         printk(KERN_NOTICE
1271                                "  send /proc/acpi/dsdt to the developers\n");
1272                         kfree(model);
1273                         return -ENODEV;
1274                 }
1275                 hotk->methods = &model_conf[hotk->model];
1276                 return AE_OK;
1277         }
1278         hotk->methods = &model_conf[hotk->model];
1279         printk(KERN_NOTICE "  %s model detected, supported\n", string);
1280
1281         /* Sort of per-model blacklist */
1282         if (strncmp(string, "L2B", 3) == 0)
1283                 hotk->methods->lcd_status = NULL;
1284         /* L2B is similar enough to L3C to use its settings, with this only
1285            exception */
1286         else if (strncmp(string, "A3G", 3) == 0)
1287                 hotk->methods->lcd_status = "\\BLFG";
1288         /* A3G is like M6R */
1289         else if (strncmp(string, "S5N", 3) == 0 ||
1290                  strncmp(string, "M5N", 3) == 0 ||
1291                  strncmp(string, "W3N", 3) == 0)
1292                 hotk->methods->mt_mled = NULL;
1293         /* S5N, M5N and W3N have no MLED */
1294         else if (strncmp(string, "L5D", 3) == 0)
1295                 hotk->methods->mt_wled = NULL;
1296         /* L5D's WLED is not controlled by ACPI */
1297         else if (strncmp(string, "M2N", 3) == 0 ||
1298                  strncmp(string, "W3V", 3) == 0 ||
1299                  strncmp(string, "S1N", 3) == 0)
1300                 hotk->methods->mt_wled = "WLED";
1301         /* M2N, S1N and W3V have a usable WLED */
1302         else if (asus_info) {
1303                 if (strncmp(asus_info->oem_table_id, "L1", 2) == 0)
1304                         hotk->methods->mled_status = NULL;
1305                 /* S1300A reports L84F, but L1400B too, account for that */
1306         }
1307
1308         kfree(model);
1309
1310         return AE_OK;
1311 }
1312
1313 static int asus_hotk_check(void)
1314 {
1315         int result = 0;
1316
1317         result = acpi_bus_get_status(hotk->device);
1318         if (result)
1319                 return result;
1320
1321         if (hotk->device->status.present) {
1322                 result = asus_hotk_get_info();
1323         } else {
1324                 printk(KERN_ERR "  Hotkey device not present, aborting\n");
1325                 return -EINVAL;
1326         }
1327
1328         return result;
1329 }
1330
1331 static int asus_hotk_found;
1332
1333 static int asus_hotk_add(struct acpi_device *device)
1334 {
1335         acpi_status status = AE_OK;
1336         int result;
1337
1338         printk(KERN_NOTICE "Asus Laptop ACPI Extras version %s\n",
1339                ASUS_ACPI_VERSION);
1340
1341         hotk = kzalloc(sizeof(struct asus_hotk), GFP_KERNEL);
1342         if (!hotk)
1343                 return -ENOMEM;
1344
1345         hotk->handle = device->handle;
1346         strcpy(acpi_device_name(device), ACPI_HOTK_DEVICE_NAME);
1347         strcpy(acpi_device_class(device), ACPI_HOTK_CLASS);
1348         device->driver_data = hotk;
1349         hotk->device = device;
1350
1351         result = asus_hotk_check();
1352         if (result)
1353                 goto end;
1354
1355         result = asus_hotk_add_fs(device);
1356         if (result)
1357                 goto end;
1358
1359         /* For laptops without GPLV: init the hotk->brightness value */
1360         if ((!hotk->methods->brightness_get)
1361             && (!hotk->methods->brightness_status)
1362             && (hotk->methods->brightness_up && hotk->methods->brightness_down)) {
1363                 status =
1364                     acpi_evaluate_object(NULL, hotk->methods->brightness_down,
1365                                          NULL, NULL);
1366                 if (ACPI_FAILURE(status))
1367                         printk(KERN_WARNING "  Error changing brightness\n");
1368                 else {
1369                         status =
1370                             acpi_evaluate_object(NULL,
1371                                                  hotk->methods->brightness_up,
1372                                                  NULL, NULL);
1373                         if (ACPI_FAILURE(status))
1374                                 printk(KERN_WARNING "  Strange, error changing"
1375                                        " brightness\n");
1376                 }
1377         }
1378
1379         asus_hotk_found = 1;
1380
1381         /* LED display is off by default */
1382         hotk->ledd_status = 0xFFF;
1383
1384 end:
1385         if (result)
1386                 kfree(hotk);
1387
1388         return result;
1389 }
1390
1391 static int asus_hotk_remove(struct acpi_device *device, int type)
1392 {
1393         asus_hotk_remove_fs(device);
1394
1395         kfree(hotk);
1396
1397         return 0;
1398 }
1399
1400 static struct backlight_ops asus_backlight_data = {
1401         .get_brightness = read_brightness,
1402         .update_status  = set_brightness_status,
1403 };
1404
1405 static void asus_acpi_exit(void)
1406 {
1407         if (asus_backlight_device)
1408                 backlight_device_unregister(asus_backlight_device);
1409
1410         acpi_bus_unregister_driver(&asus_hotk_driver);
1411         remove_proc_entry(PROC_ASUS, acpi_root_dir);
1412
1413         return;
1414 }
1415
1416 static int __init asus_acpi_init(void)
1417 {
1418         int result;
1419
1420         result = acpi_bus_register_driver(&asus_hotk_driver);
1421         if (result < 0)
1422                 return result;
1423
1424         asus_proc_dir = proc_mkdir(PROC_ASUS, acpi_root_dir);
1425         if (!asus_proc_dir) {
1426                 printk(KERN_ERR "Asus ACPI: Unable to create /proc entry\n");
1427                 acpi_bus_unregister_driver(&asus_hotk_driver);
1428                 return -ENODEV;
1429         }
1430
1431         /*
1432          * This is a bit of a kludge.  We only want this module loaded
1433          * for ASUS systems, but there's currently no way to probe the
1434          * ACPI namespace for ASUS HIDs.  So we just return failure if
1435          * we didn't find one, which will cause the module to be
1436          * unloaded.
1437          */
1438         if (!asus_hotk_found) {
1439                 acpi_bus_unregister_driver(&asus_hotk_driver);
1440                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1441                 return -ENODEV;
1442         }
1443
1444         asus_backlight_device = backlight_device_register("asus", NULL, NULL,
1445                                                           &asus_backlight_data);
1446         if (IS_ERR(asus_backlight_device)) {
1447                 printk(KERN_ERR "Could not register asus backlight device\n");
1448                 asus_backlight_device = NULL;
1449                 asus_acpi_exit();
1450                 return -ENODEV;
1451         }
1452         asus_backlight_device->props.max_brightness = 15;
1453
1454         return 0;
1455 }
1456
1457 module_init(asus_acpi_init);
1458 module_exit(asus_acpi_exit);