drivers/acpi/video.c

   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/list.h>
  32 #include <linux/mutex.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/input.h>
  36 #include <linux/backlight.h>
  37 #include <linux/video_output.h>
  38 #include <asm/uaccess.h>
  39
  40 #include <acpi/acpi_bus.h>
  41 #include <acpi/acpi_drivers.h>
  42
  43 #define ACPI_VIDEO_COMPONENT            0x08000000
  44 #define ACPI_VIDEO_CLASS                "video"
  45 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  46 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  47 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  48 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  49 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  50 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  51 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  52
  53 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  54 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  55 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  56 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  57 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  58
  59 #define ACPI_VIDEO_HEAD_INVALID         (~0u - 1)
  60 #define ACPI_VIDEO_HEAD_END             (~0u)
  61 #define MAX_NAME_LEN    20
  62
  63 #define ACPI_VIDEO_DISPLAY_CRT  1
  64 #define ACPI_VIDEO_DISPLAY_TV   2
  65 #define ACPI_VIDEO_DISPLAY_DVI  3
  66 #define ACPI_VIDEO_DISPLAY_LCD  4
  67
  68 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  69 ACPI_MODULE_NAME("video");
  70
  71 MODULE_AUTHOR("Bruno Ducrot");
  72 MODULE_DESCRIPTION("ACPI Video Driver");
  73 MODULE_LICENSE("GPL");
  74
  75 static int acpi_video_bus_add(struct acpi_device *device);
  76 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  77
  78 static const struct acpi_device_id video_device_ids[] = {
  79         {ACPI_VIDEO_HID, 0},
  80         {"", 0},
  81 };
  82 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  83
  84 static struct acpi_driver acpi_video_bus = {
  85         .name = "video",
  86         .class = ACPI_VIDEO_CLASS,
  87         .ids = video_device_ids,
  88         .ops = {
  89                 .add = acpi_video_bus_add,
  90                 .remove = acpi_video_bus_remove,
  91                 },
  92 };
  93
  94 struct acpi_video_bus_flags {
  95         u8 multihead:1;         /* can switch video heads */
  96         u8 rom:1;               /* can retrieve a video rom */
  97         u8 post:1;              /* can configure the head to */
  98         u8 reserved:5;
  99 };
 100
 101 struct acpi_video_bus_cap {
 102         u8 _DOS:1;              /*Enable/Disable output switching */
 103         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 104         u8 _ROM:1;              /*Get ROM Data */
 105         u8 _GPD:1;              /*Get POST Device */
 106         u8 _SPD:1;              /*Set POST Device */
 107         u8 _VPO:1;              /*Video POST Options */
 108         u8 reserved:2;
 109 };
 110
 111 struct acpi_video_device_attrib {
 112         u32 display_index:4;    /* A zero-based instance of the Display */
 113         u32 display_port_attachment:4;  /*This field differentiates the display type */
 114         u32 display_type:4;     /*Describe the specific type in use */
 115         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 116         u32 bios_can_detect:1;  /*BIOS can detect the device */
 117         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 118                                    the VGA device. */
 119         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 120         u32 reserved:10;        /*Must be 0 */
 121         u32 device_id_scheme:1; /*Device ID Scheme */
 122 };
 123
 124 struct acpi_video_enumerated_device {
 125         union {
 126                 u32 int_val;
 127                 struct acpi_video_device_attrib attrib;
 128         } value;
 129         struct acpi_video_device *bind_info;
 130 };
 131
 132 struct acpi_video_bus {
 133         struct acpi_device *device;
 134         u8 dos_setting;
 135         struct acpi_video_enumerated_device *attached_array;
 136         u8 attached_count;
 137         struct acpi_video_bus_cap cap;
 138         struct acpi_video_bus_flags flags;
 139         struct list_head video_device_list;
 140         struct mutex device_list_lock;  /* protects video_device_list */
 141         struct proc_dir_entry *dir;
 142         struct input_dev *input;
 143         char phys[32];  /* for input device */
 144 };
 145
 146 struct acpi_video_device_flags {
 147         u8 crt:1;
 148         u8 lcd:1;
 149         u8 tvout:1;
 150         u8 dvi:1;
 151         u8 bios:1;
 152         u8 unknown:1;
 153         u8 reserved:2;
 154 };
 155
 156 struct acpi_video_device_cap {
 157         u8 _ADR:1;              /*Return the unique ID */
 158         u8 _BCL:1;              /*Query list of brightness control levels supported */
 159         u8 _BCM:1;              /*Set the brightness level */
 160         u8 _BQC:1;              /* Get current brightness level */
 161         u8 _DDC:1;              /*Return the EDID for this device */
 162         u8 _DCS:1;              /*Return status of output device */
 163         u8 _DGS:1;              /*Query graphics state */
 164         u8 _DSS:1;              /*Device state set */
 165 };
 166
 167 struct acpi_video_device_brightness {
 168         int curr;
 169         int count;
 170         int *levels;
 171 };
 172
 173 struct acpi_video_device {
 174         unsigned long device_id;
 175         struct acpi_video_device_flags flags;
 176         struct acpi_video_device_cap cap;
 177         struct list_head entry;
 178         struct acpi_video_bus *video;
 179         struct acpi_device *dev;
 180         struct acpi_video_device_brightness *brightness;
 181         struct backlight_device *backlight;
 182         struct output_device *output_dev;
 183 };
 184
 185 /* bus */
 186 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 187 static struct file_operations acpi_video_bus_info_fops = {
 188         .open = acpi_video_bus_info_open_fs,
 189         .read = seq_read,
 190         .llseek = seq_lseek,
 191         .release = single_release,
 192 };
 193
 194 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 195 static struct file_operations acpi_video_bus_ROM_fops = {
 196         .open = acpi_video_bus_ROM_open_fs,
 197         .read = seq_read,
 198         .llseek = seq_lseek,
 199         .release = single_release,
 200 };
 201
 202 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 203                                             struct file *file);
 204 static struct file_operations acpi_video_bus_POST_info_fops = {
 205         .open = acpi_video_bus_POST_info_open_fs,
 206         .read = seq_read,
 207         .llseek = seq_lseek,
 208         .release = single_release,
 209 };
 210
 211 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 212 static struct file_operations acpi_video_bus_POST_fops = {
 213         .open = acpi_video_bus_POST_open_fs,
 214         .read = seq_read,
 215         .llseek = seq_lseek,
 216         .release = single_release,
 217 };
 218
 219 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 220 static struct file_operations acpi_video_bus_DOS_fops = {
 221         .open = acpi_video_bus_DOS_open_fs,
 222         .read = seq_read,
 223         .llseek = seq_lseek,
 224         .release = single_release,
 225 };
 226
 227 /* device */
 228 static int acpi_video_device_info_open_fs(struct inode *inode,
 229                                           struct file *file);
 230 static struct file_operations acpi_video_device_info_fops = {
 231         .open = acpi_video_device_info_open_fs,
 232         .read = seq_read,
 233         .llseek = seq_lseek,
 234         .release = single_release,
 235 };
 236
 237 static int acpi_video_device_state_open_fs(struct inode *inode,
 238                                            struct file *file);
 239 static struct file_operations acpi_video_device_state_fops = {
 240         .open = acpi_video_device_state_open_fs,
 241         .read = seq_read,
 242         .llseek = seq_lseek,
 243         .release = single_release,
 244 };
 245
 246 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 247                                                 struct file *file);
 248 static struct file_operations acpi_video_device_brightness_fops = {
 249         .open = acpi_video_device_brightness_open_fs,
 250         .read = seq_read,
 251         .llseek = seq_lseek,
 252         .release = single_release,
 253 };
 254
 255 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 256                                           struct file *file);
 257 static struct file_operations acpi_video_device_EDID_fops = {
 258         .open = acpi_video_device_EDID_open_fs,
 259         .read = seq_read,
 260         .llseek = seq_lseek,
 261         .release = single_release,
 262 };
 263
 264 static char device_decode[][30] = {
 265         "motherboard VGA device",
 266         "PCI VGA device",
 267         "AGP VGA device",
 268         "UNKNOWN",
 269 };
 270
 271 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 272 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 273 static void acpi_video_device_bind(struct acpi_video_bus *video,
 274                                    struct acpi_video_device *device);
 275 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 276 static int acpi_video_switch_output(struct acpi_video_bus *video, int event);
 277 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 278                         int level);
 279 static int acpi_video_device_lcd_get_level_current(
 280                         struct acpi_video_device *device,
 281                         unsigned long *level);
 282 static int acpi_video_get_next_level(struct acpi_video_device *device,
 283                                      u32 level_current, u32 event);
 284 static void acpi_video_switch_brightness(struct acpi_video_device *device,
 285                                          int event);
 286 static int acpi_video_device_get_state(struct acpi_video_device *device,
 287                             unsigned long *state);
 288 static int acpi_video_output_get(struct output_device *od);
 289 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 290
 291 /*backlight device sysfs support*/
 292 static int acpi_video_get_brightness(struct backlight_device *bd)
 293 {
 294         unsigned long cur_level;
 295         int i;
 296         struct acpi_video_device *vd =
 297                 (struct acpi_video_device *)bl_get_data(bd);
 298         acpi_video_device_lcd_get_level_current(vd, &cur_level);
 299         for (i = 2; i < vd->brightness->count; i++) {
 300                 if (vd->brightness->levels[i] == cur_level)
 301                         /* The first two entries are special - see page 575
 302                            of the ACPI spec 3.0 */
 303                         return i-2;
 304         }
 305         return 0;
 306 }
 307
 308 static int acpi_video_set_brightness(struct backlight_device *bd)
 309 {
 310         int request_level = bd->props.brightness+2;
 311         struct acpi_video_device *vd =
 312                 (struct acpi_video_device *)bl_get_data(bd);
 313         acpi_video_device_lcd_set_level(vd,
 314                                         vd->brightness->levels[request_level]);
 315         return 0;
 316 }
 317
 318 static struct backlight_ops acpi_backlight_ops = {
 319         .get_brightness = acpi_video_get_brightness,
 320         .update_status  = acpi_video_set_brightness,
 321 };
 322
 323 /*video output device sysfs support*/
 324 static int acpi_video_output_get(struct output_device *od)
 325 {
 326         unsigned long state;
 327         struct acpi_video_device *vd =
 328                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 329         acpi_video_device_get_state(vd, &state);
 330         return (int)state;
 331 }
 332
 333 static int acpi_video_output_set(struct output_device *od)
 334 {
 335         unsigned long state = od->request_state;
 336         struct acpi_video_device *vd=
 337                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 338         return acpi_video_device_set_state(vd, state);
 339 }
 340
 341 static struct output_properties acpi_output_properties = {
 342         .set_state = acpi_video_output_set,
 343         .get_status = acpi_video_output_get,
 344 };
 345 /* --------------------------------------------------------------------------
 346                                Video Management
 347    -------------------------------------------------------------------------- */
 348
 349 /* device */
 350
 351 static int
 352 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
 353 {
 354         int status;
 355
 356         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 357
 358         return status;
 359 }
 360
 361 static int
 362 acpi_video_device_get_state(struct acpi_video_device *device,
 363                             unsigned long *state)
 364 {
 365         int status;
 366
 367         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 368
 369         return status;
 370 }
 371
 372 static int
 373 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 374 {
 375         int status;
 376         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 377         struct acpi_object_list args = { 1, &arg0 };
 378         unsigned long ret;
 379
 380
 381         arg0.integer.value = state;
 382         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 383
 384         return status;
 385 }
 386
 387 static int
 388 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 389                                    union acpi_object **levels)
 390 {
 391         int status;
 392         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 393         union acpi_object *obj;
 394
 395
 396         *levels = NULL;
 397
 398         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 399         if (!ACPI_SUCCESS(status))
 400                 return status;
 401         obj = (union acpi_object *)buffer.pointer;
 402         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 403                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 404                 status = -EFAULT;
 405                 goto err;
 406         }
 407
 408         *levels = obj;
 409
 410         return 0;
 411
 412       err:
 413         kfree(buffer.pointer);
 414
 415         return status;
 416 }
 417
 418 static int
 419 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 420 {
 421         int status = AE_OK;
 422         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 423         struct acpi_object_list args = { 1, &arg0 };
 424
 425
 426         arg0.integer.value = level;
 427
 428         if (device->cap._BCM)
 429                 status = acpi_evaluate_object(device->dev->handle, "_BCM",
 430                                               &args, NULL);
 431         device->brightness->curr = level;
 432         return status;
 433 }
 434
 435 static int
 436 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 437                                         unsigned long *level)
 438 {
 439         if (device->cap._BQC)
 440                 return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
 441                                              level);
 442         *level = device->brightness->curr;
 443         return AE_OK;
 444 }
 445
 446 static int
 447 acpi_video_device_EDID(struct acpi_video_device *device,
 448                        union acpi_object **edid, ssize_t length)
 449 {
 450         int status;
 451         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 452         union acpi_object *obj;
 453         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 454         struct acpi_object_list args = { 1, &arg0 };
 455
 456
 457         *edid = NULL;
 458
 459         if (!device)
 460                 return -ENODEV;
 461         if (length == 128)
 462                 arg0.integer.value = 1;
 463         else if (length == 256)
 464                 arg0.integer.value = 2;
 465         else
 466                 return -EINVAL;
 467
 468         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 469         if (ACPI_FAILURE(status))
 470                 return -ENODEV;
 471
 472         obj = buffer.pointer;
 473
 474         if (obj && obj->type == ACPI_TYPE_BUFFER)
 475                 *edid = obj;
 476         else {
 477                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 478                 status = -EFAULT;
 479                 kfree(obj);
 480         }
 481
 482         return status;
 483 }
 484
 485 /* bus */
 486
 487 static int
 488 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 489 {
 490         int status;
 491         unsigned long tmp;
 492         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 493         struct acpi_object_list args = { 1, &arg0 };
 494
 495
 496         arg0.integer.value = option;
 497
 498         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 499         if (ACPI_SUCCESS(status))
 500                 status = tmp ? (-EINVAL) : (AE_OK);
 501
 502         return status;
 503 }
 504
 505 static int
 506 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
 507 {
 508         int status;
 509
 510         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 511
 512         return status;
 513 }
 514
 515 static int
 516 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 517                             unsigned long *options)
 518 {
 519         int status;
 520
 521         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 522         *options &= 3;
 523
 524         return status;
 525 }
 526
 527 /*
 528  *  Arg:
 529  *      video           : video bus device pointer
 530  *      bios_flag       :
 531  *              0.      The system BIOS should NOT automatically switch(toggle)
 532  *                      the active display output.
 533  *              1.      The system BIOS should automatically switch (toggle) the
 534  *                      active display output. No switch event.
 535  *              2.      The _DGS value should be locked.
 536  *              3.      The system BIOS should not automatically switch (toggle) the
 537  *                      active display output, but instead generate the display switch
 538  *                      event notify code.
 539  *      lcd_flag        :
 540  *              0.      The system BIOS should automatically control the brightness level
 541  *                      of the LCD when the power changes from AC to DC
 542  *              1.      The system BIOS should NOT automatically control the brightness
 543  *                      level of the LCD when the power changes from AC to DC.
 544  * Return Value:
 545  *              -1      wrong arg.
 546  */
 547
 548 static int
 549 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 550 {
 551         acpi_integer status = 0;
 552         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 553         struct acpi_object_list args = { 1, &arg0 };
 554
 555
 556         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 557                 status = -1;
 558                 goto Failed;
 559         }
 560         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 561         video->dos_setting = arg0.integer.value;
 562         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 563
 564       Failed:
 565         return status;
 566 }
 567
 568 /*
 569  *  Arg:
 570  *      device  : video output device (LCD, CRT, ..)
 571  *
 572  *  Return Value:
 573  *      None
 574  *
 575  *  Find out all required AML methods defined under the output
 576  *  device.
 577  */
 578
 579 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 580 {
 581         acpi_handle h_dummy1;
 582         int i;
 583         u32 max_level = 0;
 584         union acpi_object *obj = NULL;
 585         struct acpi_video_device_brightness *br = NULL;
 586
 587
 588         memset(&device->cap, 0, sizeof(device->cap));
 589
 590         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 591                 device->cap._ADR = 1;
 592         }
 593         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 594                 device->cap._BCL = 1;
 595         }
 596         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 597                 device->cap._BCM = 1;
 598         }
 599         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 600                 device->cap._BQC = 1;
 601         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 602                 device->cap._DDC = 1;
 603         }
 604         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 605                 device->cap._DCS = 1;
 606         }
 607         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 608                 device->cap._DGS = 1;
 609         }
 610         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 611                 device->cap._DSS = 1;
 612         }
 613
 614         if (ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 615
 616                 if (obj->package.count >= 2) {
 617                         int count = 0;
 618                         union acpi_object *o;
 619
 620                         br = kzalloc(sizeof(*br), GFP_KERNEL);
 621                         if (!br) {
 622                                 printk(KERN_ERR "can't allocate memory\n");
 623                         } else {
 624                                 br->levels = kmalloc(obj->package.count *
 625                                                      sizeof *(br->levels), GFP_KERNEL);
 626                                 if (!br->levels)
 627                                         goto out;
 628
 629                                 for (i = 0; i < obj->package.count; i++) {
 630                                         o = (union acpi_object *)&obj->package.
 631                                             elements[i];
 632                                         if (o->type != ACPI_TYPE_INTEGER) {
 633                                                 printk(KERN_ERR PREFIX "Invalid data\n");
 634                                                 continue;
 635                                         }
 636                                         br->levels[count] = (u32) o->integer.value;
 637
 638                                         if (br->levels[count] > max_level)
 639                                                 max_level = br->levels[count];
 640                                         count++;
 641                                 }
 642                               out:
 643                                 if (count < 2) {
 644                                         kfree(br->levels);
 645                                         kfree(br);
 646                                 } else {
 647                                         br->count = count;
 648                                         device->brightness = br;
 649                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 650                                                           "found %d brightness levels\n",
 651                                                           count));
 652                                 }
 653                         }
 654                 }
 655
 656         } else {
 657                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available LCD brightness level\n"));
 658         }
 659
 660         kfree(obj);
 661
 662         if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
 663                 static int count = 0;
 664                 char *name;
 665                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 666                 if (!name)
 667                         return;
 668
 669                 sprintf(name, "acpi_video%d", count++);
 670                 device->backlight = backlight_device_register(name,
 671                         NULL, device, &acpi_backlight_ops);
 672                 device->backlight->props.max_brightness = device->brightness->count-3;
 673                 device->backlight->props.brightness = acpi_video_get_brightness(device->backlight);
 674                 backlight_update_status(device->backlight);
 675
 676                 kfree(name);
 677         }
 678         if (device->cap._DCS && device->cap._DSS){
 679                 static int count = 0;
 680                 char *name;
 681                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 682                 if (!name)
 683                         return;
 684                 sprintf(name, "acpi_video%d", count++);
 685                 device->output_dev = video_output_register(name,
 686                                 NULL, device, &acpi_output_properties);
 687                 kfree(name);
 688         }
 689         return;
 690 }
 691
 692 /*
 693  *  Arg:
 694  *      device  : video output device (VGA)
 695  *
 696  *  Return Value:
 697  *      None
 698  *
 699  *  Find out all required AML methods defined under the video bus device.
 700  */
 701
 702 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 703 {
 704         acpi_handle h_dummy1;
 705
 706         memset(&video->cap, 0, sizeof(video->cap));
 707         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 708                 video->cap._DOS = 1;
 709         }
 710         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 711                 video->cap._DOD = 1;
 712         }
 713         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 714                 video->cap._ROM = 1;
 715         }
 716         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 717                 video->cap._GPD = 1;
 718         }
 719         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 720                 video->cap._SPD = 1;
 721         }
 722         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 723                 video->cap._VPO = 1;
 724         }
 725 }
 726
 727 /*
 728  * Check whether the video bus device has required AML method to
 729  * support the desired features
 730  */
 731
 732 static int acpi_video_bus_check(struct acpi_video_bus *video)
 733 {
 734         acpi_status status = -ENOENT;
 735
 736
 737         if (!video)
 738                 return -EINVAL;
 739
 740         /* Since there is no HID, CID and so on for VGA driver, we have
 741          * to check well known required nodes.
 742          */
 743
 744         /* Does this device support video switching? */
 745         if (video->cap._DOS) {
 746                 video->flags.multihead = 1;
 747                 status = 0;
 748         }
 749
 750         /* Does this device support retrieving a video ROM? */
 751         if (video->cap._ROM) {
 752                 video->flags.rom = 1;
 753                 status = 0;
 754         }
 755
 756         /* Does this device support configuring which video device to POST? */
 757         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 758                 video->flags.post = 1;
 759                 status = 0;
 760         }
 761
 762         return status;
 763 }
 764
 765 /* --------------------------------------------------------------------------
 766                               FS Interface (/proc)
 767    -------------------------------------------------------------------------- */
 768
 769 static struct proc_dir_entry *acpi_video_dir;
 770
 771 /* video devices */
 772
 773 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 774 {
 775         struct acpi_video_device *dev = seq->private;
 776
 777
 778         if (!dev)
 779                 goto end;
 780
 781         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 782         seq_printf(seq, "type:         ");
 783         if (dev->flags.crt)
 784                 seq_printf(seq, "CRT\n");
 785         else if (dev->flags.lcd)
 786                 seq_printf(seq, "LCD\n");
 787         else if (dev->flags.tvout)
 788                 seq_printf(seq, "TVOUT\n");
 789         else if (dev->flags.dvi)
 790                 seq_printf(seq, "DVI\n");
 791         else
 792                 seq_printf(seq, "UNKNOWN\n");
 793
 794         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 795
 796       end:
 797         return 0;
 798 }
 799
 800 static int
 801 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 802 {
 803         return single_open(file, acpi_video_device_info_seq_show,
 804                            PDE(inode)->data);
 805 }
 806
 807 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 808 {
 809         int status;
 810         struct acpi_video_device *dev = seq->private;
 811         unsigned long state;
 812
 813
 814         if (!dev)
 815                 goto end;
 816
 817         status = acpi_video_device_get_state(dev, &state);
 818         seq_printf(seq, "state:     ");
 819         if (ACPI_SUCCESS(status))
 820                 seq_printf(seq, "0x%02lx\n", state);
 821         else
 822                 seq_printf(seq, "<not supported>\n");
 823
 824         status = acpi_video_device_query(dev, &state);
 825         seq_printf(seq, "query:     ");
 826         if (ACPI_SUCCESS(status))
 827                 seq_printf(seq, "0x%02lx\n", state);
 828         else
 829                 seq_printf(seq, "<not supported>\n");
 830
 831       end:
 832         return 0;
 833 }
 834
 835 static int
 836 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 837 {
 838         return single_open(file, acpi_video_device_state_seq_show,
 839                            PDE(inode)->data);
 840 }
 841
 842 static ssize_t
 843 acpi_video_device_write_state(struct file *file,
 844                               const char __user * buffer,
 845                               size_t count, loff_t * data)
 846 {
 847         int status;
 848         struct seq_file *m = file->private_data;
 849         struct acpi_video_device *dev = m->private;
 850         char str[12] = { 0 };
 851         u32 state = 0;
 852
 853
 854         if (!dev || count + 1 > sizeof str)
 855                 return -EINVAL;
 856
 857         if (copy_from_user(str, buffer, count))
 858                 return -EFAULT;
 859
 860         str[count] = 0;
 861         state = simple_strtoul(str, NULL, 0);
 862         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
 863
 864         status = acpi_video_device_set_state(dev, state);
 865
 866         if (status)
 867                 return -EFAULT;
 868
 869         return count;
 870 }
 871
 872 static int
 873 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
 874 {
 875         struct acpi_video_device *dev = seq->private;
 876         int i;
 877
 878
 879         if (!dev || !dev->brightness) {
 880                 seq_printf(seq, "<not supported>\n");
 881                 return 0;
 882         }
 883
 884         seq_printf(seq, "levels: ");
 885         for (i = 0; i < dev->brightness->count; i++)
 886                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 887         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 888
 889         return 0;
 890 }
 891
 892 static int
 893 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
 894 {
 895         return single_open(file, acpi_video_device_brightness_seq_show,
 896                            PDE(inode)->data);
 897 }
 898
 899 static ssize_t
 900 acpi_video_device_write_brightness(struct file *file,
 901                                    const char __user * buffer,
 902                                    size_t count, loff_t * data)
 903 {
 904         struct seq_file *m = file->private_data;
 905         struct acpi_video_device *dev = m->private;
 906         char str[5] = { 0 };
 907         unsigned int level = 0;
 908         int i;
 909
 910
 911         if (!dev || !dev->brightness || count + 1 > sizeof str)
 912                 return -EINVAL;
 913
 914         if (copy_from_user(str, buffer, count))
 915                 return -EFAULT;
 916
 917         str[count] = 0;
 918         level = simple_strtoul(str, NULL, 0);
 919
 920         if (level > 100)
 921                 return -EFAULT;
 922
 923         /* validate through the list of available levels */
 924         for (i = 0; i < dev->brightness->count; i++)
 925                 if (level == dev->brightness->levels[i]) {
 926                         if (ACPI_SUCCESS
 927                             (acpi_video_device_lcd_set_level(dev, level)))
 928                                 dev->brightness->curr = level;
 929                         break;
 930                 }
 931
 932         return count;
 933 }
 934
 935 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
 936 {
 937         struct acpi_video_device *dev = seq->private;
 938         int status;
 939         int i;
 940         union acpi_object *edid = NULL;
 941
 942
 943         if (!dev)
 944                 goto out;
 945
 946         status = acpi_video_device_EDID(dev, &edid, 128);
 947         if (ACPI_FAILURE(status)) {
 948                 status = acpi_video_device_EDID(dev, &edid, 256);
 949         }
 950
 951         if (ACPI_FAILURE(status)) {
 952                 goto out;
 953         }
 954
 955         if (edid && edid->type == ACPI_TYPE_BUFFER) {
 956                 for (i = 0; i < edid->buffer.length; i++)
 957                         seq_putc(seq, edid->buffer.pointer[i]);
 958         }
 959
 960       out:
 961         if (!edid)
 962                 seq_printf(seq, "<not supported>\n");
 963         else
 964                 kfree(edid);
 965
 966         return 0;
 967 }
 968
 969 static int
 970 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
 971 {
 972         return single_open(file, acpi_video_device_EDID_seq_show,
 973                            PDE(inode)->data);
 974 }
 975
 976 static int acpi_video_device_add_fs(struct acpi_device *device)
 977 {
 978         struct proc_dir_entry *entry = NULL;
 979         struct acpi_video_device *vid_dev;
 980
 981
 982         if (!device)
 983                 return -ENODEV;
 984
 985         vid_dev = acpi_driver_data(device);
 986         if (!vid_dev)
 987                 return -ENODEV;
 988
 989         if (!acpi_device_dir(device)) {
 990                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 991                                                      vid_dev->video->dir);
 992                 if (!acpi_device_dir(device))
 993                         return -ENODEV;
 994                 acpi_device_dir(device)->owner = THIS_MODULE;
 995         }
 996
 997         /* 'info' [R] */
 998         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
 999         if (!entry)
1000                 return -ENODEV;
1001         else {
1002                 entry->proc_fops = &acpi_video_device_info_fops;
1003                 entry->data = acpi_driver_data(device);
1004                 entry->owner = THIS_MODULE;
1005         }
1006
1007         /* 'state' [R/W] */
1008         entry =
1009             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
1010                               acpi_device_dir(device));
1011         if (!entry)
1012                 return -ENODEV;
1013         else {
1014                 acpi_video_device_state_fops.write = acpi_video_device_write_state;
1015                 entry->proc_fops = &acpi_video_device_state_fops;
1016                 entry->data = acpi_driver_data(device);
1017                 entry->owner = THIS_MODULE;
1018         }
1019
1020         /* 'brightness' [R/W] */
1021         entry =
1022             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1023                               acpi_device_dir(device));
1024         if (!entry)
1025                 return -ENODEV;
1026         else {
1027                 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
1028                 entry->proc_fops = &acpi_video_device_brightness_fops;
1029                 entry->data = acpi_driver_data(device);
1030                 entry->owner = THIS_MODULE;
1031         }
1032
1033         /* 'EDID' [R] */
1034         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
1035         if (!entry)
1036                 return -ENODEV;
1037         else {
1038                 entry->proc_fops = &acpi_video_device_EDID_fops;
1039                 entry->data = acpi_driver_data(device);
1040                 entry->owner = THIS_MODULE;
1041         }
1042
1043         return 0;
1044 }
1045
1046 static int acpi_video_device_remove_fs(struct acpi_device *device)
1047 {
1048         struct acpi_video_device *vid_dev;
1049
1050         vid_dev = acpi_driver_data(device);
1051         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1052                 return -ENODEV;
1053
1054         if (acpi_device_dir(device)) {
1055                 remove_proc_entry("info", acpi_device_dir(device));
1056                 remove_proc_entry("state", acpi_device_dir(device));
1057                 remove_proc_entry("brightness", acpi_device_dir(device));
1058                 remove_proc_entry("EDID", acpi_device_dir(device));
1059                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1060                 acpi_device_dir(device) = NULL;
1061         }
1062
1063         return 0;
1064 }
1065
1066 /* video bus */
1067 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1068 {
1069         struct acpi_video_bus *video = seq->private;
1070
1071
1072         if (!video)
1073                 goto end;
1074
1075         seq_printf(seq, "Switching heads:              %s\n",
1076                    video->flags.multihead ? "yes" : "no");
1077         seq_printf(seq, "Video ROM:                    %s\n",
1078                    video->flags.rom ? "yes" : "no");
1079         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1080                    video->flags.post ? "yes" : "no");
1081
1082       end:
1083         return 0;
1084 }
1085
1086 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1087 {
1088         return single_open(file, acpi_video_bus_info_seq_show,
1089                            PDE(inode)->data);
1090 }
1091
1092 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1093 {
1094         struct acpi_video_bus *video = seq->private;
1095
1096
1097         if (!video)
1098                 goto end;
1099
1100         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
1101         seq_printf(seq, "<TODO>\n");
1102
1103       end:
1104         return 0;
1105 }
1106
1107 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1108 {
1109         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1110 }
1111
1112 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1113 {
1114         struct acpi_video_bus *video = seq->private;
1115         unsigned long options;
1116         int status;
1117
1118
1119         if (!video)
1120                 goto end;
1121
1122         status = acpi_video_bus_POST_options(video, &options);
1123         if (ACPI_SUCCESS(status)) {
1124                 if (!(options & 1)) {
1125                         printk(KERN_WARNING PREFIX
1126                                "The motherboard VGA device is not listed as a possible POST device.\n");
1127                         printk(KERN_WARNING PREFIX
1128                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1129                 }
1130                 printk("%lx\n", options);
1131                 seq_printf(seq, "can POST: <integrated video>");
1132                 if (options & 2)
1133                         seq_printf(seq, " <PCI video>");
1134                 if (options & 4)
1135                         seq_printf(seq, " <AGP video>");
1136                 seq_putc(seq, '\n');
1137         } else
1138                 seq_printf(seq, "<not supported>\n");
1139       end:
1140         return 0;
1141 }
1142
1143 static int
1144 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1145 {
1146         return single_open(file, acpi_video_bus_POST_info_seq_show,
1147                            PDE(inode)->data);
1148 }
1149
1150 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1151 {
1152         struct acpi_video_bus *video = seq->private;
1153         int status;
1154         unsigned long id;
1155
1156
1157         if (!video)
1158                 goto end;
1159
1160         status = acpi_video_bus_get_POST(video, &id);
1161         if (!ACPI_SUCCESS(status)) {
1162                 seq_printf(seq, "<not supported>\n");
1163                 goto end;
1164         }
1165         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1166
1167       end:
1168         return 0;
1169 }
1170
1171 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1172 {
1173         struct acpi_video_bus *video = seq->private;
1174
1175
1176         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1177
1178         return 0;
1179 }
1180
1181 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1182 {
1183         return single_open(file, acpi_video_bus_POST_seq_show,
1184                            PDE(inode)->data);
1185 }
1186
1187 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1188 {
1189         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1190 }
1191
1192 static ssize_t
1193 acpi_video_bus_write_POST(struct file *file,
1194                           const char __user * buffer,
1195                           size_t count, loff_t * data)
1196 {
1197         int status;
1198         struct seq_file *m = file->private_data;
1199         struct acpi_video_bus *video = m->private;
1200         char str[12] = { 0 };
1201         unsigned long opt, options;
1202
1203
1204         if (!video || count + 1 > sizeof str)
1205                 return -EINVAL;
1206
1207         status = acpi_video_bus_POST_options(video, &options);
1208         if (!ACPI_SUCCESS(status))
1209                 return -EINVAL;
1210
1211         if (copy_from_user(str, buffer, count))
1212                 return -EFAULT;
1213
1214         str[count] = 0;
1215         opt = strtoul(str, NULL, 0);
1216         if (opt > 3)
1217                 return -EFAULT;
1218
1219         /* just in case an OEM 'forgot' the motherboard... */
1220         options |= 1;
1221
1222         if (options & (1ul << opt)) {
1223                 status = acpi_video_bus_set_POST(video, opt);
1224                 if (!ACPI_SUCCESS(status))
1225                         return -EFAULT;
1226
1227         }
1228
1229         return count;
1230 }
1231
1232 static ssize_t
1233 acpi_video_bus_write_DOS(struct file *file,
1234                          const char __user * buffer,
1235                          size_t count, loff_t * data)
1236 {
1237         int status;
1238         struct seq_file *m = file->private_data;
1239         struct acpi_video_bus *video = m->private;
1240         char str[12] = { 0 };
1241         unsigned long opt;
1242
1243
1244         if (!video || count + 1 > sizeof str)
1245                 return -EINVAL;
1246
1247         if (copy_from_user(str, buffer, count))
1248                 return -EFAULT;
1249
1250         str[count] = 0;
1251         opt = strtoul(str, NULL, 0);
1252         if (opt > 7)
1253                 return -EFAULT;
1254
1255         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1256
1257         if (!ACPI_SUCCESS(status))
1258                 return -EFAULT;
1259
1260         return count;
1261 }
1262
1263 static int acpi_video_bus_add_fs(struct acpi_device *device)
1264 {
1265         long device_id;
1266         int status;
1267         struct proc_dir_entry *entry = NULL;
1268         struct acpi_video_bus *video;
1269         struct device *dev;
1270
1271         status =
1272             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1273
1274         if (!ACPI_SUCCESS(status))
1275                 return -ENODEV;
1276
1277         /* We need to attempt to determine whether the _ADR refers to a
1278            PCI device or not. There's no terribly good way to do this,
1279            so the best we can hope for is to assume that there'll never
1280            be a video device in the host bridge */
1281         if (device_id >= 0x10000) {
1282                 /* It looks like a PCI device. Does it exist? */
1283                 dev = acpi_get_physical_device(device->handle);
1284         } else {
1285                 /* It doesn't look like a PCI device. Does its parent
1286                    exist? */
1287                 acpi_handle phandle;
1288                 if (acpi_get_parent(device->handle, &phandle))
1289                         return -ENODEV;
1290                 dev = acpi_get_physical_device(phandle);
1291         }
1292         if (!dev)
1293                 return -ENODEV;
1294         put_device(dev);
1295
1296
1297
1298         video = acpi_driver_data(device);
1299
1300         if (!acpi_device_dir(device)) {
1301                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1302                                                      acpi_video_dir);
1303                 if (!acpi_device_dir(device))
1304                         return -ENODEV;
1305                 video->dir = acpi_device_dir(device);
1306                 acpi_device_dir(device)->owner = THIS_MODULE;
1307         }
1308
1309         /* 'info' [R] */
1310         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1311         if (!entry)
1312                 return -ENODEV;
1313         else {
1314                 entry->proc_fops = &acpi_video_bus_info_fops;
1315                 entry->data = acpi_driver_data(device);
1316                 entry->owner = THIS_MODULE;
1317         }
1318
1319         /* 'ROM' [R] */
1320         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1321         if (!entry)
1322                 return -ENODEV;
1323         else {
1324                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1325                 entry->data = acpi_driver_data(device);
1326                 entry->owner = THIS_MODULE;
1327         }
1328
1329         /* 'POST_info' [R] */
1330         entry =
1331             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1332         if (!entry)
1333                 return -ENODEV;
1334         else {
1335                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1336                 entry->data = acpi_driver_data(device);
1337                 entry->owner = THIS_MODULE;
1338         }
1339
1340         /* 'POST' [R/W] */
1341         entry =
1342             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1343                               acpi_device_dir(device));
1344         if (!entry)
1345                 return -ENODEV;
1346         else {
1347                 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1348                 entry->proc_fops = &acpi_video_bus_POST_fops;
1349                 entry->data = acpi_driver_data(device);
1350                 entry->owner = THIS_MODULE;
1351         }
1352
1353         /* 'DOS' [R/W] */
1354         entry =
1355             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1356                               acpi_device_dir(device));
1357         if (!entry)
1358                 return -ENODEV;
1359         else {
1360                 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1361                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1362                 entry->data = acpi_driver_data(device);
1363                 entry->owner = THIS_MODULE;
1364         }
1365
1366         return 0;
1367 }
1368
1369 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1370 {
1371         struct acpi_video_bus *video;
1372
1373
1374         video = acpi_driver_data(device);
1375
1376         if (acpi_device_dir(device)) {
1377                 remove_proc_entry("info", acpi_device_dir(device));
1378                 remove_proc_entry("ROM", acpi_device_dir(device));
1379                 remove_proc_entry("POST_info", acpi_device_dir(device));
1380                 remove_proc_entry("POST", acpi_device_dir(device));
1381                 remove_proc_entry("DOS", acpi_device_dir(device));
1382                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1383                 acpi_device_dir(device) = NULL;
1384         }
1385
1386         return 0;
1387 }
1388
1389 /* --------------------------------------------------------------------------
1390                                  Driver Interface
1391    -------------------------------------------------------------------------- */
1392
1393 /* device interface */
1394 static struct acpi_video_device_attrib*
1395 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1396 {
1397         int count;
1398
1399         for(count = 0; count < video->attached_count; count++)
1400                 if((video->attached_array[count].value.int_val & 0xffff) == device_id)
1401                         return &(video->attached_array[count].value.attrib);
1402         return NULL;
1403 }
1404
1405 static int
1406 acpi_video_bus_get_one_device(struct acpi_device *device,
1407                               struct acpi_video_bus *video)
1408 {
1409         unsigned long device_id;
1410         int status;
1411         struct acpi_video_device *data;
1412         struct acpi_video_device_attrib* attribute;
1413
1414         if (!device || !video)
1415                 return -EINVAL;
1416
1417         status =
1418             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1419         if (ACPI_SUCCESS(status)) {
1420
1421                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1422                 if (!data)
1423                         return -ENOMEM;
1424
1425                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1426                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1427                 acpi_driver_data(device) = data;
1428
1429                 data->device_id = device_id;
1430                 data->video = video;
1431                 data->dev = device;
1432
1433                 attribute = acpi_video_get_device_attr(video, device_id);
1434
1435                 if((attribute != NULL) && attribute->device_id_scheme) {
1436                         switch (attribute->display_type) {
1437                         case ACPI_VIDEO_DISPLAY_CRT:
1438                                 data->flags.crt = 1;
1439                                 break;
1440                         case ACPI_VIDEO_DISPLAY_TV:
1441                                 data->flags.tvout = 1;
1442                                 break;
1443                         case ACPI_VIDEO_DISPLAY_DVI:
1444                                 data->flags.dvi = 1;
1445                                 break;
1446                         case ACPI_VIDEO_DISPLAY_LCD:
1447                                 data->flags.lcd = 1;
1448                                 break;
1449                         default:
1450                                 data->flags.unknown = 1;
1451                                 break;
1452                         }
1453                         if(attribute->bios_can_detect)
1454                                 data->flags.bios = 1;
1455                 } else
1456                         data->flags.unknown = 1;
1457
1458                 acpi_video_device_bind(video, data);
1459                 acpi_video_device_find_cap(data);
1460
1461                 status = acpi_install_notify_handler(device->handle,
1462                                                      ACPI_DEVICE_NOTIFY,
1463                                                      acpi_video_device_notify,
1464                                                      data);
1465                 if (ACPI_FAILURE(status)) {
1466                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1467                                           "Error installing notify handler\n"));
1468                         if(data->brightness)
1469                                 kfree(data->brightness->levels);
1470                         kfree(data->brightness);
1471                         kfree(data);
1472                         return -ENODEV;
1473                 }
1474
1475                 mutex_lock(&video->device_list_lock);
1476                 list_add_tail(&data->entry, &video->video_device_list);
1477                 mutex_unlock(&video->device_list_lock);
1478
1479                 acpi_video_device_add_fs(device);
1480
1481                 return 0;
1482         }
1483
1484         return -ENOENT;
1485 }
1486
1487 /*
1488  *  Arg:
1489  *      video   : video bus device
1490  *
1491  *  Return:
1492  *      none
1493  *
1494  *  Enumerate the video device list of the video bus,
1495  *  bind the ids with the corresponding video devices
1496  *  under the video bus.
1497  */
1498
1499 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1500 {
1501         struct acpi_video_device *dev;
1502
1503         mutex_lock(&video->device_list_lock);
1504
1505         list_for_each_entry(dev, &video->video_device_list, entry)
1506                 acpi_video_device_bind(video, dev);
1507
1508         mutex_unlock(&video->device_list_lock);
1509 }
1510
1511 /*
1512  *  Arg:
1513  *      video   : video bus device
1514  *      device  : video output device under the video
1515  *              bus
1516  *
1517  *  Return:
1518  *      none
1519  *
1520  *  Bind the ids with the corresponding video devices
1521  *  under the video bus.
1522  */
1523
1524 static void
1525 acpi_video_device_bind(struct acpi_video_bus *video,
1526                        struct acpi_video_device *device)
1527 {
1528         int i;
1529
1530 #define IDS_VAL(i) video->attached_array[i].value.int_val
1531 #define IDS_BIND(i) video->attached_array[i].bind_info
1532
1533         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1534              i < video->attached_count; i++) {
1535                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1536                         IDS_BIND(i) = device;
1537                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1538                 }
1539         }
1540 #undef IDS_VAL
1541 #undef IDS_BIND
1542 }
1543
1544 /*
1545  *  Arg:
1546  *      video   : video bus device
1547  *
1548  *  Return:
1549  *      < 0     : error
1550  *
1551  *  Call _DOD to enumerate all devices attached to display adapter
1552  *
1553  */
1554
1555 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1556 {
1557         int status;
1558         int count;
1559         int i;
1560         struct acpi_video_enumerated_device *active_device_list;
1561         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1562         union acpi_object *dod = NULL;
1563         union acpi_object *obj;
1564
1565         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1566         if (!ACPI_SUCCESS(status)) {
1567                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1568                 return status;
1569         }
1570
1571         dod = buffer.pointer;
1572         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1573                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1574                 status = -EFAULT;
1575                 goto out;
1576         }
1577
1578         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1579                           dod->package.count));
1580
1581         active_device_list = kmalloc((1 +
1582                                       dod->package.count) *
1583                                      sizeof(struct
1584                                             acpi_video_enumerated_device),
1585                                      GFP_KERNEL);
1586
1587         if (!active_device_list) {
1588                 status = -ENOMEM;
1589                 goto out;
1590         }
1591
1592         count = 0;
1593         for (i = 0; i < dod->package.count; i++) {
1594                 obj = &dod->package.elements[i];
1595
1596                 if (obj->type != ACPI_TYPE_INTEGER) {
1597                         printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1598                         active_device_list[i].value.int_val =
1599                             ACPI_VIDEO_HEAD_INVALID;
1600                 }
1601                 active_device_list[i].value.int_val = obj->integer.value;
1602                 active_device_list[i].bind_info = NULL;
1603                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1604                                   (int)obj->integer.value));
1605                 count++;
1606         }
1607         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1608
1609         kfree(video->attached_array);
1610
1611         video->attached_array = active_device_list;
1612         video->attached_count = count;
1613       out:
1614         kfree(buffer.pointer);
1615         return status;
1616 }
1617
1618 /*
1619  *  Arg:
1620  *      video   : video bus device
1621  *      event   : notify event
1622  *
1623  *  Return:
1624  *      < 0     : error
1625  *
1626  *      1. Find out the current active output device.
1627  *      2. Identify the next output device to switch to.
1628  *      3. call _DSS to do actual switch.
1629  */
1630
1631 static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
1632 {
1633         struct list_head *node;
1634         struct acpi_video_device *dev = NULL;
1635         struct acpi_video_device *dev_next = NULL;
1636         struct acpi_video_device *dev_prev = NULL;
1637         unsigned long state;
1638         int status = 0;
1639
1640         mutex_lock(&video->device_list_lock);
1641
1642         list_for_each(node, &video->video_device_list) {
1643                 dev = container_of(node, struct acpi_video_device, entry);
1644                 status = acpi_video_device_get_state(dev, &state);
1645                 if (state & 0x2) {
1646                         dev_next = container_of(node->next,
1647                                         struct acpi_video_device, entry);
1648                         dev_prev = container_of(node->prev,
1649                                         struct acpi_video_device, entry);
1650                         goto out;
1651                 }
1652         }
1653
1654         dev_next = container_of(node->next, struct acpi_video_device, entry);
1655         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1656
1657  out:
1658         mutex_unlock(&video->device_list_lock);
1659
1660         switch (event) {
1661         case ACPI_VIDEO_NOTIFY_CYCLE:
1662         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
1663                 acpi_video_device_set_state(dev, 0);
1664                 acpi_video_device_set_state(dev_next, 0x80000001);
1665                 break;
1666         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
1667                 acpi_video_device_set_state(dev, 0);
1668                 acpi_video_device_set_state(dev_prev, 0x80000001);
1669         default:
1670                 break;
1671         }
1672
1673         return status;
1674 }
1675
1676 static int
1677 acpi_video_get_next_level(struct acpi_video_device *device,
1678                           u32 level_current, u32 event)
1679 {
1680         int min, max, min_above, max_below, i, l, delta = 255;
1681         max = max_below = 0;
1682         min = min_above = 255;
1683         /* Find closest level to level_current */
1684         for (i = 0; i < device->brightness->count; i++) {
1685                 l = device->brightness->levels[i];
1686                 if (abs(l - level_current) < abs(delta)) {
1687                         delta = l - level_current;
1688                         if (!delta)
1689                                 break;
1690                 }
1691         }
1692         /* Ajust level_current to closest available level */
1693         level_current += delta;
1694         for (i = 0; i < device->brightness->count; i++) {
1695                 l = device->brightness->levels[i];
1696                 if (l < min)
1697                         min = l;
1698                 if (l > max)
1699                         max = l;
1700                 if (l < min_above && l > level_current)
1701                         min_above = l;
1702                 if (l > max_below && l < level_current)
1703                         max_below = l;
1704         }
1705
1706         switch (event) {
1707         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1708                 return (level_current < max) ? min_above : min;
1709         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1710                 return (level_current < max) ? min_above : max;
1711         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1712                 return (level_current > min) ? max_below : min;
1713         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1714         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1715                 return 0;
1716         default:
1717                 return level_current;
1718         }
1719 }
1720
1721 static void
1722 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1723 {
1724         unsigned long level_current, level_next;
1725         acpi_video_device_lcd_get_level_current(device, &level_current);
1726         level_next = acpi_video_get_next_level(device, level_current, event);
1727         acpi_video_device_lcd_set_level(device, level_next);
1728 }
1729
1730 static int
1731 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1732                            struct acpi_device *device)
1733 {
1734         int status = 0;
1735         struct acpi_device *dev;
1736
1737         acpi_video_device_enumerate(video);
1738
1739         list_for_each_entry(dev, &device->children, node) {
1740
1741                 status = acpi_video_bus_get_one_device(dev, video);
1742                 if (ACPI_FAILURE(status)) {
1743                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1744                         continue;
1745                 }
1746         }
1747         return status;
1748 }
1749
1750 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1751 {
1752         acpi_status status;
1753         struct acpi_video_bus *video;
1754
1755
1756         if (!device || !device->video)
1757                 return -ENOENT;
1758
1759         video = device->video;
1760
1761         acpi_video_device_remove_fs(device->dev);
1762
1763         status = acpi_remove_notify_handler(device->dev->handle,
1764                                             ACPI_DEVICE_NOTIFY,
1765                                             acpi_video_device_notify);
1766         backlight_device_unregister(device->backlight);
1767         video_output_unregister(device->output_dev);
1768
1769         return 0;
1770 }
1771
1772 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1773 {
1774         int status;
1775         struct acpi_video_device *dev, *next;
1776
1777         mutex_lock(&video->device_list_lock);
1778
1779         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1780
1781                 status = acpi_video_bus_put_one_device(dev);
1782                 if (ACPI_FAILURE(status))
1783                         printk(KERN_WARNING PREFIX
1784                                "hhuuhhuu bug in acpi video driver.\n");
1785
1786                 if (dev->brightness) {
1787                         kfree(dev->brightness->levels);
1788                         kfree(dev->brightness);
1789                 }
1790                 list_del(&dev->entry);
1791                 kfree(dev);
1792         }
1793
1794         mutex_unlock(&video->device_list_lock);
1795
1796         return 0;
1797 }
1798
1799 /* acpi_video interface */
1800
1801 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1802 {
1803         return acpi_video_bus_DOS(video, 0, 0);
1804 }
1805
1806 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1807 {
1808         return acpi_video_bus_DOS(video, 0, 1);
1809 }
1810
1811 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1812 {
1813         struct acpi_video_bus *video = data;
1814         struct acpi_device *device = NULL;
1815         struct input_dev *input;
1816         int keycode;
1817
1818         if (!video)
1819                 return;
1820
1821         device = video->device;
1822         input = video->input;
1823
1824         switch (event) {
1825         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1826                                          * most likely via hotkey. */
1827                 acpi_bus_generate_proc_event(device, event, 0);
1828                 keycode = KEY_SWITCHVIDEOMODE;
1829                 break;
1830
1831         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1832                                          * connector. */
1833                 acpi_video_device_enumerate(video);
1834                 acpi_video_device_rebind(video);
1835                 acpi_video_switch_output(video, event);
1836                 acpi_bus_generate_proc_event(device, event, 0);
1837                 keycode = KEY_SWITCHVIDEOMODE;
1838                 break;
1839
1840         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1841                 acpi_video_switch_output(video, event);
1842                 acpi_bus_generate_proc_event(device, event, 0);
1843                 keycode = KEY_SWITCHVIDEOMODE;
1844                 break;
1845         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1846                 acpi_video_switch_output(video, event);
1847                 acpi_bus_generate_proc_event(device, event, 0);
1848                 keycode = KEY_VIDEO_NEXT;
1849                 break;
1850         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1851                 acpi_video_switch_output(video, event);
1852                 acpi_bus_generate_proc_event(device, event, 0);
1853                 keycode = KEY_VIDEO_PREV;
1854                 break;
1855
1856         default:
1857                 keycode = KEY_UNKNOWN;
1858                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1859                                   "Unsupported event [0x%x]\n", event));
1860                 break;
1861         }
1862
1863         input_report_key(input, keycode, 1);
1864         input_sync(input);
1865         input_report_key(input, keycode, 0);
1866         input_sync(input);
1867
1868         return;
1869 }
1870
1871 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1872 {
1873         struct acpi_video_device *video_device = data;
1874         struct acpi_device *device = NULL;
1875         struct acpi_video_bus *bus;
1876         struct input_dev *input;
1877         int keycode;
1878
1879         if (!video_device)
1880                 return;
1881
1882         device = video_device->dev;
1883         bus = video_device->video;
1884         input = bus->input;
1885
1886         switch (event) {
1887         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1888                 acpi_video_switch_brightness(video_device, event);
1889                 acpi_bus_generate_proc_event(device, event, 0);
1890                 keycode = KEY_BRIGHTNESS_CYCLE;
1891                 break;
1892         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1893                 acpi_video_switch_brightness(video_device, event);
1894                 acpi_bus_generate_proc_event(device, event, 0);
1895                 keycode = KEY_BRIGHTNESSUP;
1896                 break;
1897         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1898                 acpi_video_switch_brightness(video_device, event);
1899                 acpi_bus_generate_proc_event(device, event, 0);
1900                 keycode = KEY_BRIGHTNESSDOWN;
1901                 break;
1902         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1903                 acpi_video_switch_brightness(video_device, event);
1904                 acpi_bus_generate_proc_event(device, event, 0);
1905                 keycode = KEY_BRIGHTNESS_ZERO;
1906                 break;
1907         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1908                 acpi_video_switch_brightness(video_device, event);
1909                 acpi_bus_generate_proc_event(device, event, 0);
1910                 keycode = KEY_DISPLAY_OFF;
1911                 break;
1912         default:
1913                 keycode = KEY_UNKNOWN;
1914                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1915                                   "Unsupported event [0x%x]\n", event));
1916                 break;
1917         }
1918
1919         input_report_key(input, keycode, 1);
1920         input_sync(input);
1921         input_report_key(input, keycode, 0);
1922         input_sync(input);
1923
1924         return;
1925 }
1926
1927 static int instance;
1928 static int acpi_video_bus_add(struct acpi_device *device)
1929 {
1930         acpi_status status;
1931         struct acpi_video_bus *video;
1932         struct input_dev *input;
1933         int error;
1934
1935         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1936         if (!video)
1937                 return -ENOMEM;
1938
1939         /* a hack to fix the duplicate name "VID" problem on T61 */
1940         if (!strcmp(device->pnp.bus_id, "VID")) {
1941                 if (instance)
1942                         device->pnp.bus_id[3] = '0' + instance;
1943                 instance ++;
1944         }
1945
1946         video->device = device;
1947         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1948         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1949         acpi_driver_data(device) = video;
1950
1951         acpi_video_bus_find_cap(video);
1952         error = acpi_video_bus_check(video);
1953         if (error)
1954                 goto err_free_video;
1955
1956         error = acpi_video_bus_add_fs(device);
1957         if (error)
1958                 goto err_free_video;
1959
1960         mutex_init(&video->device_list_lock);
1961         INIT_LIST_HEAD(&video->video_device_list);
1962
1963         acpi_video_bus_get_devices(video, device);
1964         acpi_video_bus_start_devices(video);
1965
1966         status = acpi_install_notify_handler(device->handle,
1967                                              ACPI_DEVICE_NOTIFY,
1968                                              acpi_video_bus_notify, video);
1969         if (ACPI_FAILURE(status)) {
1970                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1971                                   "Error installing notify handler\n"));
1972                 error = -ENODEV;
1973                 goto err_stop_video;
1974         }
1975
1976         video->input = input = input_allocate_device();
1977         if (!input) {
1978                 error = -ENOMEM;
1979                 goto err_uninstall_notify;
1980         }
1981
1982         snprintf(video->phys, sizeof(video->phys),
1983                 "%s/video/input0", acpi_device_hid(video->device));
1984
1985         input->name = acpi_device_name(video->device);
1986         input->phys = video->phys;
1987         input->id.bustype = BUS_HOST;
1988         input->id.product = 0x06;
1989         input->dev.parent = &device->dev;
1990         input->evbit[0] = BIT(EV_KEY);
1991         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1992         set_bit(KEY_VIDEO_NEXT, input->keybit);
1993         set_bit(KEY_VIDEO_PREV, input->keybit);
1994         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1995         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1996         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1997         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1998         set_bit(KEY_DISPLAY_OFF, input->keybit);
1999         set_bit(KEY_UNKNOWN, input->keybit);
2000
2001         error = input_register_device(input);
2002         if (error)
2003                 goto err_free_input_dev;
2004
2005         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2006                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2007                video->flags.multihead ? "yes" : "no",
2008                video->flags.rom ? "yes" : "no",
2009                video->flags.post ? "yes" : "no");
2010
2011         return 0;
2012
2013  err_free_input_dev:
2014         input_free_device(input);
2015  err_uninstall_notify:
2016         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2017                                    acpi_video_bus_notify);
2018  err_stop_video:
2019         acpi_video_bus_stop_devices(video);
2020         acpi_video_bus_put_devices(video);
2021         kfree(video->attached_array);
2022         acpi_video_bus_remove_fs(device);
2023  err_free_video:
2024         kfree(video);
2025         acpi_driver_data(device) = NULL;
2026
2027         return error;
2028 }
2029
2030 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2031 {
2032         acpi_status status = 0;
2033         struct acpi_video_bus *video = NULL;
2034
2035
2036         if (!device || !acpi_driver_data(device))
2037                 return -EINVAL;
2038
2039         video = acpi_driver_data(device);
2040
2041         acpi_video_bus_stop_devices(video);
2042
2043         status = acpi_remove_notify_handler(video->device->handle,
2044                                             ACPI_DEVICE_NOTIFY,
2045                                             acpi_video_bus_notify);
2046
2047         acpi_video_bus_put_devices(video);
2048         acpi_video_bus_remove_fs(device);
2049
2050         input_unregister_device(video->input);
2051         kfree(video->attached_array);
2052         kfree(video);
2053
2054         return 0;
2055 }
2056
2057 static int __init acpi_video_init(void)
2058 {
2059         int result = 0;
2060
2061
2062         /*
2063            acpi_dbg_level = 0xFFFFFFFF;
2064            acpi_dbg_layer = 0x08000000;
2065          */
2066
2067         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2068         if (!acpi_video_dir)
2069                 return -ENODEV;
2070         acpi_video_dir->owner = THIS_MODULE;
2071
2072         result = acpi_bus_register_driver(&acpi_video_bus);
2073         if (result < 0) {
2074                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2075                 return -ENODEV;
2076         }
2077
2078         return 0;
2079 }
2080
2081 static void __exit acpi_video_exit(void)
2082 {
2083
2084         acpi_bus_unregister_driver(&acpi_video_bus);
2085
2086         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2087
2088         return;
2089 }
2090
2091 module_init(acpi_video_init);
2092 module_exit(acpi_video_exit);