drivers/acpi/asus_acpi.c

   1 /*
   2  *  asus_acpi.c - Asus Laptop ACPI Extras
   3  *
   4  *
   5  *  Copyright (C) 2002-2005 Julien Lerouge, 2003-2006 Karol Kozimor
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *
  22  *  The development page for this driver is located at
  23  *  http://sourceforge.net/projects/acpi4asus/
  24  *
  25  *  Credits:
  26  *  Pontus Fuchs   - Helper functions, cleanup
  27  *  Johann Wiesner - Small compile fixes
  28  *  John Belmonte  - ACPI code for Toshiba laptop was a good starting point.
  29  *  �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 #define ACPI_HOTK_HID           "ATK0100"
  60
  61 /*
  62  * Some events we use, same for all Asus
  63  */
  64 #define BR_UP       0x10
  65 #define BR_DOWN     0x20
  66
  67 /*
  68  * Flags for hotk status
  69  */
  70 #define MLED_ON     0x01        //mail LED
  71 #define WLED_ON     0x02        //wireless LED
  72 #define TLED_ON     0x04        //touchpad LED
  73 #define BT_ON       0x08        //internal Bluetooth
  74
  75 MODULE_AUTHOR("Julien Lerouge, Karol Kozimor");
  76 MODULE_DESCRIPTION(ACPI_HOTK_NAME);
  77 MODULE_LICENSE("GPL");
  78
  79 static uid_t asus_uid;
  80 static gid_t asus_gid;
  81 module_param(asus_uid, uint, 0);
  82 MODULE_PARM_DESC(asus_uid, "UID for entries in /proc/acpi/asus.\n");
  83 module_param(asus_gid, uint, 0);
  84 MODULE_PARM_DESC(asus_gid, "GID for entries in /proc/acpi/asus.\n");
  85
  86 /* For each model, all features implemented,
  87  * those marked with R are relative to HOTK, A for absolute */
  88 struct model_data {
  89         char *name;             //name of the laptop________________A
  90         char *mt_mled;          //method to handle mled_____________R
  91         char *mled_status;      //node to handle mled reading_______A
  92         char *mt_wled;          //method to handle wled_____________R
  93         char *wled_status;      //node to handle wled reading_______A
  94         char *mt_tled;          //method to handle tled_____________R
  95         char *tled_status;      //node to handle tled reading_______A
  96         char *mt_ledd;          //method to handle LED display______R
  97         char *mt_bt_switch;     //method to switch Bluetooth on/off_R
  98         char *bt_status;        //no model currently supports this__?
  99         char *mt_lcd_switch;    //method to turn LCD on/off_________A
 100         char *lcd_status;       //node to read LCD panel state______A
 101         char *brightness_up;    //method to set brightness up_______A
 102         char *brightness_down;  //guess what ?______________________A
 103         char *brightness_set;   //method to set absolute brightness_R
 104         char *brightness_get;   //method to get absolute brightness_R
 105         char *brightness_status;        //node to get brightness____________A
 106         char *display_set;      //method to set video output________R
 107         char *display_get;      //method to get video output________R
 108 };
 109
 110 /*
 111  * This is the main structure, we can use it to store anything interesting
 112  * about the hotk device
 113  */
 114 struct asus_hotk {
 115         struct acpi_device *device;     //the device we are in
 116         acpi_handle handle;     //the handle of the hotk device
 117         char status;            //status of the hotk, for LEDs, ...
 118         u32 ledd_status;        //status of the LED display
 119         struct model_data *methods;     //methods available on the laptop
 120         u8 brightness;          //brightness level
 121         enum {
 122                 A1x = 0,        //A1340D, A1300F
 123                 A2x,            //A2500H
 124                 A4G,            //A4700G
 125                 D1x,            //D1
 126                 L2D,            //L2000D
 127                 L3C,            //L3800C
 128                 L3D,            //L3400D
 129                 L3H,            //L3H, L2000E, L5D
 130                 L4R,            //L4500R
 131                 L5x,            //L5800C
 132                 L8L,            //L8400L
 133                 M1A,            //M1300A
 134                 M2E,            //M2400E, L4400L
 135                 M6N,            //M6800N, W3400N
 136                 M6R,            //M6700R, A3000G
 137                 P30,            //Samsung P30
 138                 S1x,            //S1300A, but also L1400B and M2400A (L84F)
 139                 S2x,            //S200 (J1 reported), Victor MP-XP7210
 140                 W1N,            //W1000N
 141                 W5A,            //W5A
 142                 W3V,            //W3030V
 143                 xxN,            //M2400N, M3700N, M5200N, M6800N, S1300N, S5200N
 144                 A4S,            //Z81sp
 145                 //(Centrino)
 146                 END_MODEL
 147         } model;                //Models currently supported
 148         u16 event_count[128];   //count for each event TODO make this better
 149 };
 150
 151 /* Here we go */
 152 #define A1x_PREFIX "\\_SB.PCI0.ISA.EC0."
 153 #define L3C_PREFIX "\\_SB.PCI0.PX40.ECD0."
 154 #define M1A_PREFIX "\\_SB.PCI0.PX40.EC0."
 155 #define P30_PREFIX "\\_SB.PCI0.LPCB.EC0."
 156 #define S1x_PREFIX "\\_SB.PCI0.PX40."
 157 #define S2x_PREFIX A1x_PREFIX
 158 #define xxN_PREFIX "\\_SB.PCI0.SBRG.EC0."
 159
 160 static struct model_data model_conf[END_MODEL] = {
 161         /*
 162          * TODO I have seen a SWBX and AIBX method on some models, like L1400B,
 163          * it seems to be a kind of switch, but what for ?
 164          */
 165
 166         {
 167          .name = "A1x",
 168          .mt_mled = "MLED",
 169          .mled_status = "\\MAIL",
 170          .mt_lcd_switch = A1x_PREFIX "_Q10",
 171          .lcd_status = "\\BKLI",
 172          .brightness_up = A1x_PREFIX "_Q0E",
 173          .brightness_down = A1x_PREFIX "_Q0F"},
 174
 175         {
 176          .name = "A2x",
 177          .mt_mled = "MLED",
 178          .mt_wled = "WLED",
 179          .wled_status = "\\SG66",
 180          .mt_lcd_switch = "\\Q10",
 181          .lcd_status = "\\BAOF",
 182          .brightness_set = "SPLV",
 183          .brightness_get = "GPLV",
 184          .display_set = "SDSP",
 185          .display_get = "\\INFB"},
 186
 187         {
 188          .name = "A4G",
 189          .mt_mled = "MLED",
 190 /* WLED present, but not controlled by ACPI */
 191          .mt_lcd_switch = xxN_PREFIX "_Q10",
 192          .brightness_set = "SPLV",
 193          .brightness_get = "GPLV",
 194          .display_set = "SDSP",
 195          .display_get = "\\ADVG"},
 196
 197         {
 198          .name = "D1x",
 199          .mt_mled = "MLED",
 200          .mt_lcd_switch = "\\Q0D",
 201          .lcd_status = "\\GP11",
 202          .brightness_up = "\\Q0C",
 203          .brightness_down = "\\Q0B",
 204          .brightness_status = "\\BLVL",
 205          .display_set = "SDSP",
 206          .display_get = "\\INFB"},
 207
 208         {
 209          .name = "L2D",
 210          .mt_mled = "MLED",
 211          .mled_status = "\\SGP6",
 212          .mt_wled = "WLED",
 213          .wled_status = "\\RCP3",
 214          .mt_lcd_switch = "\\Q10",
 215          .lcd_status = "\\SGP0",
 216          .brightness_up = "\\Q0E",
 217          .brightness_down = "\\Q0F",
 218          .display_set = "SDSP",
 219          .display_get = "\\INFB"},
 220
 221         {
 222          .name = "L3C",
 223          .mt_mled = "MLED",
 224          .mt_wled = "WLED",
 225          .mt_lcd_switch = L3C_PREFIX "_Q10",
 226          .lcd_status = "\\GL32",
 227          .brightness_set = "SPLV",
 228          .brightness_get = "GPLV",
 229          .display_set = "SDSP",
 230          .display_get = "\\_SB.PCI0.PCI1.VGAC.NMAP"},
 231
 232         {
 233          .name = "L3D",
 234          .mt_mled = "MLED",
 235          .mled_status = "\\MALD",
 236          .mt_wled = "WLED",
 237          .mt_lcd_switch = "\\Q10",
 238          .lcd_status = "\\BKLG",
 239          .brightness_set = "SPLV",
 240          .brightness_get = "GPLV",
 241          .display_set = "SDSP",
 242          .display_get = "\\INFB"},
 243
 244         {
 245          .name = "L3H",
 246          .mt_mled = "MLED",
 247          .mt_wled = "WLED",
 248          .mt_lcd_switch = "EHK",
 249          .lcd_status = "\\_SB.PCI0.PM.PBC",
 250          .brightness_set = "SPLV",
 251          .brightness_get = "GPLV",
 252          .display_set = "SDSP",
 253          .display_get = "\\INFB"},
 254
 255         {
 256          .name = "L4R",
 257          .mt_mled = "MLED",
 258          .mt_wled = "WLED",
 259          .wled_status = "\\_SB.PCI0.SBRG.SG13",
 260          .mt_lcd_switch = xxN_PREFIX "_Q10",
 261          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
 262          .brightness_set = "SPLV",
 263          .brightness_get = "GPLV",
 264          .display_set = "SDSP",
 265          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
 266
 267         {
 268          .name = "L5x",
 269          .mt_mled = "MLED",
 270 /* WLED present, but not controlled by ACPI */
 271          .mt_tled = "TLED",
 272          .mt_lcd_switch = "\\Q0D",
 273          .lcd_status = "\\BAOF",
 274          .brightness_set = "SPLV",
 275          .brightness_get = "GPLV",
 276          .display_set = "SDSP",
 277          .display_get = "\\INFB"},
 278
 279         {
 280          .name = "L8L"
 281 /* No features, but at least support the hotkeys */
 282          },
 283
 284         {
 285          .name = "M1A",
 286          .mt_mled = "MLED",
 287          .mt_lcd_switch = M1A_PREFIX "Q10",
 288          .lcd_status = "\\PNOF",
 289          .brightness_up = M1A_PREFIX "Q0E",
 290          .brightness_down = M1A_PREFIX "Q0F",
 291          .brightness_status = "\\BRIT",
 292          .display_set = "SDSP",
 293          .display_get = "\\INFB"},
 294
 295         {
 296          .name = "M2E",
 297          .mt_mled = "MLED",
 298          .mt_wled = "WLED",
 299          .mt_lcd_switch = "\\Q10",
 300          .lcd_status = "\\GP06",
 301          .brightness_set = "SPLV",
 302          .brightness_get = "GPLV",
 303          .display_set = "SDSP",
 304          .display_get = "\\INFB"},
 305
 306         {
 307          .name = "M6N",
 308          .mt_mled = "MLED",
 309          .mt_wled = "WLED",
 310          .wled_status = "\\_SB.PCI0.SBRG.SG13",
 311          .mt_lcd_switch = xxN_PREFIX "_Q10",
 312          .lcd_status = "\\_SB.BKLT",
 313          .brightness_set = "SPLV",
 314          .brightness_get = "GPLV",
 315          .display_set = "SDSP",
 316          .display_get = "\\SSTE"},
 317
 318         {
 319          .name = "M6R",
 320          .mt_mled = "MLED",
 321          .mt_wled = "WLED",
 322          .mt_lcd_switch = xxN_PREFIX "_Q10",
 323          .lcd_status = "\\_SB.PCI0.SBSM.SEO4",
 324          .brightness_set = "SPLV",
 325          .brightness_get = "GPLV",
 326          .display_set = "SDSP",
 327          .display_get = "\\_SB.PCI0.P0P1.VGA.GETD"},
 328
 329         {
 330          .name = "P30",
 331          .mt_wled = "WLED",
 332          .mt_lcd_switch = P30_PREFIX "_Q0E",
 333          .lcd_status = "\\BKLT",
 334          .brightness_up = P30_PREFIX "_Q68",
 335          .brightness_down = P30_PREFIX "_Q69",
 336          .brightness_get = "GPLV",
 337          .display_set = "SDSP",
 338          .display_get = "\\DNXT"},
 339
 340         {
 341          .name = "S1x",
 342          .mt_mled = "MLED",
 343          .mled_status = "\\EMLE",
 344          .mt_wled = "WLED",
 345          .mt_lcd_switch = S1x_PREFIX "Q10",
 346          .lcd_status = "\\PNOF",
 347          .brightness_set = "SPLV",
 348          .brightness_get = "GPLV"},
 349
 350         {
 351          .name = "S2x",
 352          .mt_mled = "MLED",
 353          .mled_status = "\\MAIL",
 354          .mt_lcd_switch = S2x_PREFIX "_Q10",
 355          .lcd_status = "\\BKLI",
 356          .brightness_up = S2x_PREFIX "_Q0B",
 357          .brightness_down = S2x_PREFIX "_Q0A"},
 358
 359         {
 360          .name = "W1N",
 361          .mt_mled = "MLED",
 362          .mt_wled = "WLED",
 363          .mt_ledd = "SLCM",
 364          .mt_lcd_switch = xxN_PREFIX "_Q10",
 365          .lcd_status = "\\BKLT",
 366          .brightness_set = "SPLV",
 367          .brightness_get = "GPLV",
 368          .display_set = "SDSP",
 369          .display_get = "\\ADVG"},
 370
 371         {
 372          .name = "W5A",
 373          .mt_bt_switch = "BLED",
 374          .mt_wled = "WLED",
 375          .mt_lcd_switch = xxN_PREFIX "_Q10",
 376          .brightness_set = "SPLV",
 377          .brightness_get = "GPLV",
 378          .display_set = "SDSP",
 379          .display_get = "\\ADVG"},
 380
 381         {
 382          .name = "W3V",
 383          .mt_mled = "MLED",
 384          .mt_wled = "WLED",
 385          .mt_lcd_switch = xxN_PREFIX "_Q10",
 386          .lcd_status = "\\BKLT",
 387          .brightness_set = "SPLV",
 388          .brightness_get = "GPLV",
 389          .display_set = "SDSP",
 390          .display_get = "\\INFB"},
 391
 392        {
 393          .name = "xxN",
 394          .mt_mled = "MLED",
 395 /* WLED present, but not controlled by ACPI */
 396          .mt_lcd_switch = xxN_PREFIX "_Q10",
 397          .lcd_status = "\\BKLT",
 398          .brightness_set = "SPLV",
 399          .brightness_get = "GPLV",
 400          .display_set = "SDSP",
 401         .display_get = "\\ADVG"},
 402
 403         {
 404                 .name              = "A4S",
 405                 .brightness_set    = "SPLV",
 406                 .brightness_get    = "GPLV",
 407                 .mt_bt_switch      = "BLED",
 408                 .mt_wled           = "WLED"
 409         }
 410
 411 };
 412
 413 /* procdir we use */
 414 static struct proc_dir_entry *asus_proc_dir;
 415
 416 static struct backlight_device *asus_backlight_device;
 417
 418 /*
 419  * This header is made available to allow proper configuration given model,
 420  * revision number , ... this info cannot go in struct asus_hotk because it is
 421  * available before the hotk
 422  */
 423 static struct acpi_table_header *asus_info;
 424
 425 /* The actual device the driver binds to */
 426 static struct asus_hotk *hotk;
 427
 428 /*
 429  * The hotkey driver declaration
 430  */
 431 static int asus_hotk_add(struct acpi_device *device);
 432 static int asus_hotk_remove(struct acpi_device *device, int type);
 433 static struct acpi_driver asus_hotk_driver = {
 434         .name = "asus_acpi",
 435         .class = ACPI_HOTK_CLASS,
 436         .ids = ACPI_HOTK_HID,
 437         .ops = {
 438                 .add = asus_hotk_add,
 439                 .remove = asus_hotk_remove,
 440                 },
 441 };
 442
 443 /*
 444  * This function evaluates an ACPI method, given an int as parameter, the
 445  * method is searched within the scope of the handle, can be NULL. The output
 446  * of the method is written is output, which can also be NULL
 447  *
 448  * returns 1 if write is successful, 0 else.
 449  */
 450 static int write_acpi_int(acpi_handle handle, const char *method, int val,
 451                           struct acpi_buffer *output)
 452 {
 453         struct acpi_object_list params; //list of input parameters (an int here)
 454         union acpi_object in_obj;       //the only param we use
 455         acpi_status status;
 456
 457         params.count = 1;
 458         params.pointer = &in_obj;
 459         in_obj.type = ACPI_TYPE_INTEGER;
 460         in_obj.integer.value = val;
 461
 462         status = acpi_evaluate_object(handle, (char *)method, &params, output);
 463         return (status == AE_OK);
 464 }
 465
 466 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
 467 {
 468         struct acpi_buffer output;
 469         union acpi_object out_obj;
 470         acpi_status status;
 471
 472         output.length = sizeof(out_obj);
 473         output.pointer = &out_obj;
 474
 475         status = acpi_evaluate_object(handle, (char *)method, NULL, &output);
 476         *val = out_obj.integer.value;
 477         return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
 478 }
 479
 480 /*
 481  * We write our info in page, we begin at offset off and cannot write more
 482  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 483  * number of bytes written in page
 484  */
 485 static int
 486 proc_read_info(char *page, char **start, off_t off, int count, int *eof,
 487                void *data)
 488 {
 489         int len = 0;
 490         int temp;
 491         char buf[16];           //enough for all info
 492         /*
 493          * We use the easy way, we don't care of off and count, so we don't set eof
 494          * to 1
 495          */
 496
 497         len += sprintf(page, ACPI_HOTK_NAME " " ASUS_ACPI_VERSION "\n");
 498         len += sprintf(page + len, "Model reference    : %s\n",
 499                        hotk->methods->name);
 500         /*
 501          * The SFUN method probably allows the original driver to get the list
 502          * of features supported by a given model. For now, 0x0100 or 0x0800
 503          * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
 504          * The significance of others is yet to be found.
 505          */
 506         if (read_acpi_int(hotk->handle, "SFUN", &temp))
 507                 len +=
 508                     sprintf(page + len, "SFUN value         : 0x%04x\n", temp);
 509         /*
 510          * Another value for userspace: the ASYM method returns 0x02 for
 511          * battery low and 0x04 for battery critical, its readings tend to be
 512          * more accurate than those provided by _BST.
 513          * Note: since not all the laptops provide this method, errors are
 514          * silently ignored.
 515          */
 516         if (read_acpi_int(hotk->handle, "ASYM", &temp))
 517                 len +=
 518                     sprintf(page + len, "ASYM value         : 0x%04x\n", temp);
 519         if (asus_info) {
 520                 snprintf(buf, 16, "%d", asus_info->length);
 521                 len += sprintf(page + len, "DSDT length        : %s\n", buf);
 522                 snprintf(buf, 16, "%d", asus_info->checksum);
 523                 len += sprintf(page + len, "DSDT checksum      : %s\n", buf);
 524                 snprintf(buf, 16, "%d", asus_info->revision);
 525                 len += sprintf(page + len, "DSDT revision      : %s\n", buf);
 526                 snprintf(buf, 7, "%s", asus_info->oem_id);
 527                 len += sprintf(page + len, "OEM id             : %s\n", buf);
 528                 snprintf(buf, 9, "%s", asus_info->oem_table_id);
 529                 len += sprintf(page + len, "OEM table id       : %s\n", buf);
 530                 snprintf(buf, 16, "%x", asus_info->oem_revision);
 531                 len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);
 532                 snprintf(buf, 5, "%s", asus_info->asl_compiler_id);
 533                 len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
 534                 snprintf(buf, 16, "%x", asus_info->asl_compiler_revision);
 535                 len += sprintf(page + len, "ASL comp revision  : 0x%s\n", buf);
 536         }
 537
 538         return len;
 539 }
 540
 541 /*
 542  * /proc handlers
 543  * We write our info in page, we begin at offset off and cannot write more
 544  * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 545  * number of bytes written in page
 546  */
 547
 548 /* Generic LED functions */
 549 static int read_led(const char *ledname, int ledmask)
 550 {
 551         if (ledname) {
 552                 int led_status;
 553
 554                 if (read_acpi_int(NULL, ledname, &led_status))
 555                         return led_status;
 556                 else
 557                         printk(KERN_WARNING "Asus ACPI: Error reading LED "
 558                                "status\n");
 559         }
 560         return (hotk->status & ledmask) ? 1 : 0;
 561 }
 562
 563 static int parse_arg(const char __user * buf, unsigned long count, int *val)
 564 {
 565         char s[32];
 566         if (!count)
 567                 return 0;
 568         if (count > 31)
 569                 return -EINVAL;
 570         if (copy_from_user(s, buf, count))
 571                 return -EFAULT;
 572         s[count] = 0;
 573         if (sscanf(s, "%i", val) != 1)
 574                 return -EINVAL;
 575         return count;
 576 }
 577
 578 /* FIXME: kill extraneous args so it can be called independently */
 579 static int
 580 write_led(const char __user * buffer, unsigned long count,
 581           char *ledname, int ledmask, int invert)
 582 {
 583         int rv, value;
 584         int led_out = 0;
 585
 586         rv = parse_arg(buffer, count, &value);
 587         if (rv > 0)
 588                 led_out = value ? 1 : 0;
 589
 590         hotk->status =
 591             (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);
 592
 593         if (invert)             /* invert target value */
 594                 led_out = !led_out & 0x1;
 595
 596         if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
 597                 printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",
 598                        ledname);
 599
 600         return rv;
 601 }
 602
 603 /*
 604  * Proc handlers for MLED
 605  */
 606 static int
 607 proc_read_mled(char *page, char **start, off_t off, int count, int *eof,
 608                void *data)
 609 {
 610         return sprintf(page, "%d\n",
 611                        read_led(hotk->methods->mled_status, MLED_ON));
 612 }
 613
 614 static int
 615 proc_write_mled(struct file *file, const char __user * buffer,
 616                 unsigned long count, void *data)
 617 {
 618         return write_led(buffer, count, hotk->methods->mt_mled, MLED_ON, 1);
 619 }
 620
 621 /*
 622  * Proc handlers for LED display
 623  */
 624 static int
 625 proc_read_ledd(char *page, char **start, off_t off, int count, int *eof,
 626                void *data)
 627 {
 628         return sprintf(page, "0x%08x\n", hotk->ledd_status);
 629 }
 630
 631 static int
 632 proc_write_ledd(struct file *file, const char __user * buffer,
 633                 unsigned long count, void *data)
 634 {
 635         int rv, value;
 636
 637         rv = parse_arg(buffer, count, &value);
 638         if (rv > 0) {
 639                 if (!write_acpi_int
 640                     (hotk->handle, hotk->methods->mt_ledd, value, NULL))
 641                         printk(KERN_WARNING
 642                                "Asus ACPI: LED display write failed\n");
 643                 else
 644                         hotk->ledd_status = (u32) value;
 645         }
 646         return rv;
 647 }
 648
 649 /*
 650  * Proc handlers for WLED
 651  */
 652 static int
 653 proc_read_wled(char *page, char **start, off_t off, int count, int *eof,
 654                void *data)
 655 {
 656         return sprintf(page, "%d\n",
 657                        read_led(hotk->methods->wled_status, WLED_ON));
 658 }
 659
 660 static int
 661 proc_write_wled(struct file *file, const char __user * buffer,
 662                 unsigned long count, void *data)
 663 {
 664         return write_led(buffer, count, hotk->methods->mt_wled, WLED_ON, 0);
 665 }
 666
 667 /*
 668  * Proc handlers for Bluetooth
 669  */
 670 static int
 671 proc_read_bluetooth(char *page, char **start, off_t off, int count, int *eof,
 672                     void *data)
 673 {
 674         return sprintf(page, "%d\n", read_led(hotk->methods->bt_status, BT_ON));
 675 }
 676
 677 static int
 678 proc_write_bluetooth(struct file *file, const char __user * buffer,
 679                      unsigned long count, void *data)
 680 {
 681         /* Note: mt_bt_switch controls both internal Bluetooth adapter's
 682            presence and its LED */
 683         return write_led(buffer, count, hotk->methods->mt_bt_switch, BT_ON, 0);
 684 }
 685
 686 /*
 687  * Proc handlers for TLED
 688  */
 689 static int
 690 proc_read_tled(char *page, char **start, off_t off, int count, int *eof,
 691                void *data)
 692 {
 693         return sprintf(page, "%d\n",
 694                        read_led(hotk->methods->tled_status, TLED_ON));
 695 }
 696
 697 static int
 698 proc_write_tled(struct file *file, const char __user * buffer,
 699                 unsigned long count, void *data)
 700 {
 701         return write_led(buffer, count, hotk->methods->mt_tled, TLED_ON, 0);
 702 }
 703
 704 static int get_lcd_state(void)
 705 {
 706         int lcd = 0;
 707
 708         if (hotk->model != L3H) {
 709                 /* We don't have to check anything if we are here */
 710                 if (!read_acpi_int(NULL, hotk->methods->lcd_status, &lcd))
 711                         printk(KERN_WARNING
 712                                "Asus ACPI: Error reading LCD status\n");
 713
 714                 if (hotk->model == L2D)
 715                         lcd = ~lcd;
 716         } else {                /* L3H and the like have to be handled differently */
 717                 acpi_status status = 0;
 718                 struct acpi_object_list input;
 719                 union acpi_object mt_params[2];
 720                 struct acpi_buffer output;
 721                 union acpi_object out_obj;
 722
 723                 input.count = 2;
 724                 input.pointer = mt_params;
 725                 /* Note: the following values are partly guessed up, but
 726                    otherwise they seem to work */
 727                 mt_params[0].type = ACPI_TYPE_INTEGER;
 728                 mt_params[0].integer.value = 0x02;
 729                 mt_params[1].type = ACPI_TYPE_INTEGER;
 730                 mt_params[1].integer.value = 0x02;
 731
 732                 output.length = sizeof(out_obj);
 733                 output.pointer = &out_obj;
 734
 735                 status =
 736                     acpi_evaluate_object(NULL, hotk->methods->lcd_status,
 737                                          &input, &output);
 738                 if (status != AE_OK)
 739                         return -1;
 740                 if (out_obj.type == ACPI_TYPE_INTEGER)
 741                         /* That's what the AML code does */
 742                         lcd = out_obj.integer.value >> 8;
 743         }
 744
 745         return (lcd & 1);
 746 }
 747
 748 static int set_lcd_state(int value)
 749 {
 750         int lcd = 0;
 751         acpi_status status = 0;
 752
 753         lcd = value ? 1 : 0;
 754         if (lcd != get_lcd_state()) {
 755                 /* switch */
 756                 if (hotk->model != L3H) {
 757                         status =
 758                             acpi_evaluate_object(NULL,
 759                                                  hotk->methods->mt_lcd_switch,
 760                                                  NULL, NULL);
 761                 } else {        /* L3H and the like have to be handled differently */
 762                         if (!write_acpi_int
 763                             (hotk->handle, hotk->methods->mt_lcd_switch, 0x07,
 764                              NULL))
 765                                 status = AE_ERROR;
 766                         /* L3H's AML executes EHK (0x07) upon Fn+F7 keypress,
 767                            the exact behaviour is simulated here */
 768                 }
 769                 if (ACPI_FAILURE(status))
 770                         printk(KERN_WARNING "Asus ACPI: Error switching LCD\n");
 771         }
 772         return 0;
 773
 774 }
 775
 776 static int
 777 proc_read_lcd(char *page, char **start, off_t off, int count, int *eof,
 778               void *data)
 779 {
 780         return sprintf(page, "%d\n", get_lcd_state());
 781 }
 782
 783 static int
 784 proc_write_lcd(struct file *file, const char __user * buffer,
 785                unsigned long count, void *data)
 786 {
 787         int rv, value;
 788
 789         rv = parse_arg(buffer, count, &value);
 790         if (rv > 0)
 791                 set_lcd_state(value);
 792         return rv;
 793 }
 794
 795 static int read_brightness(struct backlight_device *bd)
 796 {
 797         int value;
 798
 799         if (hotk->methods->brightness_get) {    /* SPLV/GPLV laptop */
 800                 if (!read_acpi_int(hotk->handle, hotk->methods->brightness_get,
 801                                    &value))
 802                         printk(KERN_WARNING
 803                                "Asus ACPI: Error reading brightness\n");
 804         } else if (hotk->methods->brightness_status) {  /* For D1 for example */
 805                 if (!read_acpi_int(NULL, hotk->methods->brightness_status,
 806                                    &value))
 807                         printk(KERN_WARNING
 808                                "Asus ACPI: Error reading brightness\n");
 809         } else                  /* No GPLV method */
 810                 value = hotk->brightness;
 811         return value;
 812 }
 813
 814 /*
 815  * Change the brightness level
 816  */
 817 static int set_brightness(int value)
 818 {
 819         acpi_status status = 0;
 820         int ret = 0;
 821
 822         /* SPLV laptop */
 823         if (hotk->methods->brightness_set) {
 824                 if (!write_acpi_int(hotk->handle, hotk->methods->brightness_set,
 825                                     value, NULL))
 826                         printk(KERN_WARNING
 827                                "Asus ACPI: Error changing brightness\n");
 828                         ret = -EIO;
 829                 goto out;
 830         }
 831
 832         /* No SPLV method if we are here, act as appropriate */
 833         value -= read_brightness(NULL);
 834         while (value != 0) {
 835                 status = acpi_evaluate_object(NULL, (value > 0) ?
 836                                               hotk->methods->brightness_up :
 837                                               hotk->methods->brightness_down,
 838                                               NULL, NULL);
 839                 (value > 0) ? value-- : value++;
 840                 if (ACPI_FAILURE(status))
 841                         printk(KERN_WARNING
 842                                "Asus ACPI: Error changing brightness\n");
 843                         ret = -EIO;
 844         }
 845 out:
 846         return ret;
 847 }
 848
 849 static int set_brightness_status(struct backlight_device *bd)
 850 {
 851         return set_brightness(bd->props->brightness);
 852 }
 853
 854 static int
 855 proc_read_brn(char *page, char **start, off_t off, int count, int *eof,
 856               void *data)
 857 {
 858         return sprintf(page, "%d\n", read_brightness(NULL));
 859 }
 860
 861 static int
 862 proc_write_brn(struct file *file, const char __user * buffer,
 863                unsigned long count, void *data)
 864 {
 865         int rv, value;
 866
 867         rv = parse_arg(buffer, count, &value);
 868         if (rv > 0) {
 869                 value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
 870                 /* 0 <= value <= 15 */
 871                 set_brightness(value);
 872         }
 873         return rv;
 874 }
 875
 876 static void set_display(int value)
 877 {
 878         /* no sanity check needed for now */
 879         if (!write_acpi_int(hotk->handle, hotk->methods->display_set,
 880                             value, NULL))
 881                 printk(KERN_WARNING "Asus ACPI: Error setting display\n");
 882         return;
 883 }
 884
 885 /*
 886  * Now, *this* one could be more user-friendly, but so far, no-one has
 887  * complained. The significance of bits is the same as in proc_write_disp()
 888  */
 889 static int
 890 proc_read_disp(char *page, char **start, off_t off, int count, int *eof,
 891                void *data)
 892 {
 893         int value = 0;
 894
 895         if (!read_acpi_int(hotk->handle, hotk->methods->display_get, &value))
 896                 printk(KERN_WARNING
 897                        "Asus ACPI: Error reading display status\n");
 898         value &= 0x07;          /* needed for some models, shouldn't hurt others */
 899         return sprintf(page, "%d\n", value);
 900 }
 901
 902 /*
 903  * Experimental support for display switching. As of now: 1 should activate
 904  * the LCD output, 2 should do for CRT, and 4 for TV-Out. Any combination
 905  * (bitwise) of these will suffice. I never actually tested 3 displays hooked up
 906  * simultaneously, so be warned. See the acpi4asus README for more info.
 907  */
 908 static int
 909 proc_write_disp(struct file *file, const char __user * buffer,
 910                 unsigned long count, void *data)
 911 {
 912         int rv, value;
 913
 914         rv = parse_arg(buffer, count, &value);
 915         if (rv > 0)
 916                 set_display(value);
 917         return rv;
 918 }
 919
 920 typedef int (proc_readfunc) (char *page, char **start, off_t off, int count,
 921                              int *eof, void *data);
 922 typedef int (proc_writefunc) (struct file * file, const char __user * buffer,
 923                               unsigned long count, void *data);
 924
 925 static int
 926 asus_proc_add(char *name, proc_writefunc * writefunc,
 927                      proc_readfunc * readfunc, mode_t mode,
 928                      struct acpi_device *device)
 929 {
 930         struct proc_dir_entry *proc =
 931             create_proc_entry(name, mode, acpi_device_dir(device));
 932         if (!proc) {
 933                 printk(KERN_WARNING "  Unable to create %s fs entry\n", name);
 934                 return -1;
 935         }
 936         proc->write_proc = writefunc;
 937         proc->read_proc = readfunc;
 938         proc->data = acpi_driver_data(device);
 939         proc->owner = THIS_MODULE;
 940         proc->uid = asus_uid;
 941         proc->gid = asus_gid;
 942         return 0;
 943 }
 944
 945 static int asus_hotk_add_fs(struct acpi_device *device)
 946 {
 947         struct proc_dir_entry *proc;
 948         mode_t mode;
 949
 950         /*
 951          * If parameter uid or gid is not changed, keep the default setting for
 952          * our proc entries (-rw-rw-rw-) else, it means we care about security,
 953          * and then set to -rw-rw----
 954          */
 955
 956         if ((asus_uid == 0) && (asus_gid == 0)) {
 957                 mode = S_IFREG | S_IRUGO | S_IWUGO;
 958         } else {
 959                 mode = S_IFREG | S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
 960                 printk(KERN_WARNING "  asus_uid and asus_gid parameters are "
 961                        "deprecated, use chown and chmod instead!\n");
 962         }
 963
 964         acpi_device_dir(device) = asus_proc_dir;
 965         if (!acpi_device_dir(device))
 966                 return -ENODEV;
 967
 968         proc = create_proc_entry(PROC_INFO, mode, acpi_device_dir(device));
 969         if (proc) {
 970                 proc->read_proc = proc_read_info;
 971                 proc->data = acpi_driver_data(device);
 972                 proc->owner = THIS_MODULE;
 973                 proc->uid = asus_uid;
 974                 proc->gid = asus_gid;
 975         } else {
 976                 printk(KERN_WARNING "  Unable to create " PROC_INFO
 977                        " fs entry\n");
 978         }
 979
 980         if (hotk->methods->mt_wled) {
 981                 asus_proc_add(PROC_WLED, &proc_write_wled, &proc_read_wled,
 982                               mode, device);
 983         }
 984
 985         if (hotk->methods->mt_ledd) {
 986                 asus_proc_add(PROC_LEDD, &proc_write_ledd, &proc_read_ledd,
 987                               mode, device);
 988         }
 989
 990         if (hotk->methods->mt_mled) {
 991                 asus_proc_add(PROC_MLED, &proc_write_mled, &proc_read_mled,
 992                               mode, device);
 993         }
 994
 995         if (hotk->methods->mt_tled) {
 996                 asus_proc_add(PROC_TLED, &proc_write_tled, &proc_read_tled,
 997                               mode, device);
 998         }
 999
1000         if (hotk->methods->mt_bt_switch) {
1001                 asus_proc_add(PROC_BT, &proc_write_bluetooth,
1002                               &proc_read_bluetooth, mode, device);
1003         }
1004
1005         /*
1006          * We need both read node and write method as LCD switch is also accessible
1007          * from keyboard
1008          */
1009         if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status) {
1010                 asus_proc_add(PROC_LCD, &proc_write_lcd, &proc_read_lcd, mode,
1011                               device);
1012         }
1013
1014         if ((hotk->methods->brightness_up && hotk->methods->brightness_down) ||
1015             (hotk->methods->brightness_get && hotk->methods->brightness_set)) {
1016                 asus_proc_add(PROC_BRN, &proc_write_brn, &proc_read_brn, mode,
1017                               device);
1018         }
1019
1020         if (hotk->methods->display_set) {
1021                 asus_proc_add(PROC_DISP, &proc_write_disp, &proc_read_disp,
1022                               mode, device);
1023         }
1024
1025         return 0;
1026 }
1027
1028 static int asus_hotk_remove_fs(struct acpi_device *device)
1029 {
1030         if (acpi_device_dir(device)) {
1031                 remove_proc_entry(PROC_INFO, acpi_device_dir(device));
1032                 if (hotk->methods->mt_wled)
1033                         remove_proc_entry(PROC_WLED, acpi_device_dir(device));
1034                 if (hotk->methods->mt_mled)
1035                         remove_proc_entry(PROC_MLED, acpi_device_dir(device));
1036                 if (hotk->methods->mt_tled)
1037                         remove_proc_entry(PROC_TLED, acpi_device_dir(device));
1038                 if (hotk->methods->mt_ledd)
1039                         remove_proc_entry(PROC_LEDD, acpi_device_dir(device));
1040                 if (hotk->methods->mt_bt_switch)
1041                         remove_proc_entry(PROC_BT, acpi_device_dir(device));
1042                 if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status)
1043                         remove_proc_entry(PROC_LCD, acpi_device_dir(device));
1044                 if ((hotk->methods->brightness_up
1045                      && hotk->methods->brightness_down)
1046                     || (hotk->methods->brightness_get
1047                         && hotk->methods->brightness_set))
1048                         remove_proc_entry(PROC_BRN, acpi_device_dir(device));
1049                 if (hotk->methods->display_set)
1050                         remove_proc_entry(PROC_DISP, acpi_device_dir(device));
1051         }
1052         return 0;
1053 }
1054
1055 static void asus_hotk_notify(acpi_handle handle, u32 event, void *data)
1056 {
1057         /* TODO Find a better way to handle events count. */
1058         if (!hotk)
1059                 return;
1060
1061         if ((event & ~((u32) BR_UP)) < 16) {
1062                 hotk->brightness = (event & ~((u32) BR_UP));
1063         } else if ((event & ~((u32) BR_DOWN)) < 16) {
1064                 hotk->brightness = (event & ~((u32) BR_DOWN));
1065         }
1066
1067         acpi_bus_generate_event(hotk->device, event,
1068                                 hotk->event_count[event % 128]++);
1069
1070         return;
1071 }
1072
1073 /*
1074  * Match the model string to the list of supported models. Return END_MODEL if
1075  * no match or model is NULL.
1076  */
1077 static int asus_model_match(char *model)
1078 {
1079         if (model == NULL)
1080                 return END_MODEL;
1081
1082         if (strncmp(model, "L3D", 3) == 0)
1083                 return L3D;
1084         else if (strncmp(model, "L2E", 3) == 0 ||
1085                  strncmp(model, "L3H", 3) == 0 || strncmp(model, "L5D", 3) == 0)
1086                 return L3H;
1087         else if (strncmp(model, "L3", 2) == 0 || strncmp(model, "L2B", 3) == 0)
1088                 return L3C;
1089         else if (strncmp(model, "L8L", 3) == 0)
1090                 return L8L;
1091         else if (strncmp(model, "L4R", 3) == 0)
1092                 return L4R;
1093         else if (strncmp(model, "M6N", 3) == 0 || strncmp(model, "W3N", 3) == 0)
1094                 return M6N;
1095         else if (strncmp(model, "M6R", 3) == 0 || strncmp(model, "A3G", 3) == 0)
1096                 return M6R;
1097         else if (strncmp(model, "M2N", 3) == 0 ||
1098                  strncmp(model, "M3N", 3) == 0 ||
1099                  strncmp(model, "M5N", 3) == 0 ||
1100                  strncmp(model, "M6N", 3) == 0 ||
1101                  strncmp(model, "S1N", 3) == 0 ||
1102                  strncmp(model, "S5N", 3) == 0 || strncmp(model, "W1N", 3) == 0)
1103                 return xxN;
1104         else if (strncmp(model, "M1", 2) == 0)
1105                 return M1A;
1106         else if (strncmp(model, "M2", 2) == 0 || strncmp(model, "L4E", 3) == 0)
1107                 return M2E;
1108         else if (strncmp(model, "L2", 2) == 0)
1109                 return L2D;
1110         else if (strncmp(model, "L8", 2) == 0)
1111                 return S1x;
1112         else if (strncmp(model, "D1", 2) == 0)
1113                 return D1x;
1114         else if (strncmp(model, "A1", 2) == 0)
1115                 return A1x;
1116         else if (strncmp(model, "A2", 2) == 0)
1117                 return A2x;
1118         else if (strncmp(model, "J1", 2) == 0)
1119                 return S2x;
1120         else if (strncmp(model, "L5", 2) == 0)
1121                 return L5x;
1122         else if (strncmp(model, "A4G", 3) == 0)
1123                 return A4G;
1124         else if (strncmp(model, "W1N", 3) == 0)
1125                 return W1N;
1126         else if (strncmp(model, "W3V", 3) == 0)
1127                 return W3V;
1128         else if (strncmp(model, "W5A", 3) == 0)
1129                 return W5A;
1130         else if (strncmp(model, "A4S", 3) == 0)
1131                 return A4S;
1132         else
1133                 return END_MODEL;
1134 }
1135
1136 /*
1137  * This function is used to initialize the hotk with right values. In this
1138  * method, we can make all the detection we want, and modify the hotk struct
1139  */
1140 static int asus_hotk_get_info(void)
1141 {
1142         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1143         union acpi_object *model = NULL;
1144         int bsts_result;
1145         char *string = NULL;
1146         acpi_status status;
1147
1148         /*
1149          * Get DSDT headers early enough to allow for differentiating between
1150          * models, but late enough to allow acpi_bus_register_driver() to fail
1151          * before doing anything ACPI-specific. Should we encounter a machine,
1152          * which needs special handling (i.e. its hotkey device has a different
1153          * HID), this bit will be moved. A global variable asus_info contains
1154          * the DSDT header.
1155          */
1156         status = acpi_get_table(ACPI_SIG_DSDT, 1, &asus_info);
1157         if (ACPI_FAILURE(status))
1158                 printk(KERN_WARNING "  Couldn't get the DSDT table header\n");
1159
1160         /* We have to write 0 on init this far for all ASUS models */
1161         if (!write_acpi_int(hotk->handle, "INIT", 0, &buffer)) {
1162                 printk(KERN_ERR "  Hotkey initialization failed\n");
1163                 return -ENODEV;
1164         }
1165
1166         /* This needs to be called for some laptops to init properly */
1167         if (!read_acpi_int(hotk->handle, "BSTS", &bsts_result))
1168                 printk(KERN_WARNING "  Error calling BSTS\n");
1169         else if (bsts_result)
1170                 printk(KERN_NOTICE "  BSTS called, 0x%02x returned\n",
1171                        bsts_result);
1172
1173         /*
1174          * Try to match the object returned by INIT to the specific model.
1175          * Handle every possible object (or the lack of thereof) the DSDT
1176          * writers might throw at us. When in trouble, we pass NULL to
1177          * asus_model_match() and try something completely different.
1178          */
1179         if (buffer.pointer) {
1180                 model = buffer.pointer;
1181                 switch (model->type) {
1182                 case ACPI_TYPE_STRING:
1183                         string = model->string.pointer;
1184                         break;
1185                 case ACPI_TYPE_BUFFER:
1186                         string = model->buffer.pointer;
1187                         break;
1188                 default:
1189                         kfree(model);
1190                         break;
1191                 }
1192         }
1193         hotk->model = asus_model_match(string);
1194         if (hotk->model == END_MODEL) { /* match failed */
1195                 if (asus_info &&
1196                     strncmp(asus_info->oem_table_id, "ODEM", 4) == 0) {
1197                         hotk->model = P30;
1198                         printk(KERN_NOTICE
1199                                "  Samsung P30 detected, supported\n");
1200                 } else {
1201                         hotk->model = M2E;
1202                         printk(KERN_NOTICE "  unsupported model %s, trying "
1203                                "default values\n", string);
1204                         printk(KERN_NOTICE
1205                                "  send /proc/acpi/dsdt to the developers\n");
1206                 }
1207                 hotk->methods = &model_conf[hotk->model];
1208                 return AE_OK;
1209         }
1210         hotk->methods = &model_conf[hotk->model];
1211         printk(KERN_NOTICE "  %s model detected, supported\n", string);
1212
1213         /* Sort of per-model blacklist */
1214         if (strncmp(string, "L2B", 3) == 0)
1215                 hotk->methods->lcd_status = NULL;
1216         /* L2B is similar enough to L3C to use its settings, with this only
1217            exception */
1218         else if (strncmp(string, "A3G", 3) == 0)
1219                 hotk->methods->lcd_status = "\\BLFG";
1220         /* A3G is like M6R */
1221         else if (strncmp(string, "S5N", 3) == 0 ||
1222                  strncmp(string, "M5N", 3) == 0 ||
1223                  strncmp(string, "W3N", 3) == 0)
1224                 hotk->methods->mt_mled = NULL;
1225         /* S5N, M5N and W3N have no MLED */
1226         else if (strncmp(string, "L5D", 3) == 0)
1227                 hotk->methods->mt_wled = NULL;
1228         /* L5D's WLED is not controlled by ACPI */
1229         else if (strncmp(string, "M2N", 3) == 0 ||
1230                  strncmp(string, "W3V", 3) == 0 ||
1231                  strncmp(string, "S1N", 3) == 0)
1232                 hotk->methods->mt_wled = "WLED";
1233         /* M2N, S1N and W3V have a usable WLED */
1234         else if (asus_info) {
1235                 if (strncmp(asus_info->oem_table_id, "L1", 2) == 0)
1236                         hotk->methods->mled_status = NULL;
1237                 /* S1300A reports L84F, but L1400B too, account for that */
1238         }
1239
1240         kfree(model);
1241
1242         return AE_OK;
1243 }
1244
1245 static int asus_hotk_check(void)
1246 {
1247         int result = 0;
1248
1249         result = acpi_bus_get_status(hotk->device);
1250         if (result)
1251                 return result;
1252
1253         if (hotk->device->status.present) {
1254                 result = asus_hotk_get_info();
1255         } else {
1256                 printk(KERN_ERR "  Hotkey device not present, aborting\n");
1257                 return -EINVAL;
1258         }
1259
1260         return result;
1261 }
1262
1263 static int asus_hotk_found;
1264
1265 static int asus_hotk_add(struct acpi_device *device)
1266 {
1267         acpi_status status = AE_OK;
1268         int result;
1269
1270         if (!device)
1271                 return -EINVAL;
1272
1273         printk(KERN_NOTICE "Asus Laptop ACPI Extras version %s\n",
1274                ASUS_ACPI_VERSION);
1275
1276         hotk = kzalloc(sizeof(struct asus_hotk), GFP_KERNEL);
1277         if (!hotk)
1278                 return -ENOMEM;
1279
1280         hotk->handle = device->handle;
1281         strcpy(acpi_device_name(device), ACPI_HOTK_DEVICE_NAME);
1282         strcpy(acpi_device_class(device), ACPI_HOTK_CLASS);
1283         acpi_driver_data(device) = hotk;
1284         hotk->device = device;
1285
1286         result = asus_hotk_check();
1287         if (result)
1288                 goto end;
1289
1290         result = asus_hotk_add_fs(device);
1291         if (result)
1292                 goto end;
1293
1294         /*
1295          * We install the handler, it will receive the hotk in parameter, so, we
1296          * could add other data to the hotk struct
1297          */
1298         status = acpi_install_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1299                                              asus_hotk_notify, hotk);
1300         if (ACPI_FAILURE(status))
1301                 printk(KERN_ERR "  Error installing notify handler\n");
1302
1303         /* For laptops without GPLV: init the hotk->brightness value */
1304         if ((!hotk->methods->brightness_get)
1305             && (!hotk->methods->brightness_status)
1306             && (hotk->methods->brightness_up && hotk->methods->brightness_down)) {
1307                 status =
1308                     acpi_evaluate_object(NULL, hotk->methods->brightness_down,
1309                                          NULL, NULL);
1310                 if (ACPI_FAILURE(status))
1311                         printk(KERN_WARNING "  Error changing brightness\n");
1312                 else {
1313                         status =
1314                             acpi_evaluate_object(NULL,
1315                                                  hotk->methods->brightness_up,
1316                                                  NULL, NULL);
1317                         if (ACPI_FAILURE(status))
1318                                 printk(KERN_WARNING "  Strange, error changing"
1319                                        " brightness\n");
1320                 }
1321         }
1322
1323         asus_hotk_found = 1;
1324
1325         /* LED display is off by default */
1326         hotk->ledd_status = 0xFFF;
1327
1328       end:
1329         if (result) {
1330                 kfree(hotk);
1331         }
1332
1333         return result;
1334 }
1335
1336 static int asus_hotk_remove(struct acpi_device *device, int type)
1337 {
1338         acpi_status status = 0;
1339
1340         if (!device || !acpi_driver_data(device))
1341                 return -EINVAL;
1342
1343         status = acpi_remove_notify_handler(hotk->handle, ACPI_SYSTEM_NOTIFY,
1344                                             asus_hotk_notify);
1345         if (ACPI_FAILURE(status))
1346                 printk(KERN_ERR "Asus ACPI: Error removing notify handler\n");
1347
1348         asus_hotk_remove_fs(device);
1349
1350         kfree(hotk);
1351
1352         return 0;
1353 }
1354
1355 static struct backlight_properties asus_backlight_data = {
1356         .owner          = THIS_MODULE,
1357         .get_brightness = read_brightness,
1358         .update_status  = set_brightness_status,
1359         .max_brightness = 15,
1360 };
1361
1362 static void __exit asus_acpi_exit(void)
1363 {
1364         if (asus_backlight_device)
1365                 backlight_device_unregister(asus_backlight_device);
1366
1367         acpi_bus_unregister_driver(&asus_hotk_driver);
1368         remove_proc_entry(PROC_ASUS, acpi_root_dir);
1369
1370         return;
1371 }
1372
1373 static int __init asus_acpi_init(void)
1374 {
1375         int result;
1376
1377         if (acpi_disabled)
1378                 return -ENODEV;
1379
1380         asus_proc_dir = proc_mkdir(PROC_ASUS, acpi_root_dir);
1381         if (!asus_proc_dir) {
1382                 printk(KERN_ERR "Asus ACPI: Unable to create /proc entry\n");
1383                 return -ENODEV;
1384         }
1385         asus_proc_dir->owner = THIS_MODULE;
1386
1387         result = acpi_bus_register_driver(&asus_hotk_driver);
1388         if (result < 0) {
1389                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1390                 return result;
1391         }
1392
1393         /*
1394          * This is a bit of a kludge.  We only want this module loaded
1395          * for ASUS systems, but there's currently no way to probe the
1396          * ACPI namespace for ASUS HIDs.  So we just return failure if
1397          * we didn't find one, which will cause the module to be
1398          * unloaded.
1399          */
1400         if (!asus_hotk_found) {
1401                 acpi_bus_unregister_driver(&asus_hotk_driver);
1402                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
1403                 return result;
1404         }
1405
1406         asus_backlight_device = backlight_device_register("asus",NULL,NULL,
1407                                                           &asus_backlight_data);
1408         if (IS_ERR(asus_backlight_device)) {
1409                 printk(KERN_ERR "Could not register asus backlight device\n");
1410                 asus_backlight_device = NULL;
1411                 asus_acpi_exit();
1412         }
1413
1414         return 0;
1415 }
1416
1417 module_init(asus_acpi_init);
1418 module_exit(asus_acpi_exit);