SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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/proc_fs.h>
  33 #include <linux/seq_file.h>
  34 #include <linux/input.h>
  35 #include <linux/backlight.h>
  36 #include <linux/video_output.h>
  37 #include <asm/uaccess.h>
  38
  39 #include <acpi/acpi_bus.h>
  40 #include <acpi/acpi_drivers.h>
  41
  42 #define ACPI_VIDEO_COMPONENT            0x08000000
  43 #define ACPI_VIDEO_CLASS                "video"
  44 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  45 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  46 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  47 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  48 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  49 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  50 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  51
  52 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  53 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  54 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  55 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  56 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  57
  58 #define ACPI_VIDEO_HEAD_INVALID         (~0u - 1)
  59 #define ACPI_VIDEO_HEAD_END             (~0u)
  60 #define MAX_NAME_LEN    20
  61
  62 #define ACPI_VIDEO_DISPLAY_CRT  1
  63 #define ACPI_VIDEO_DISPLAY_TV   2
  64 #define ACPI_VIDEO_DISPLAY_DVI  3
  65 #define ACPI_VIDEO_DISPLAY_LCD  4
  66
  67 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  68 ACPI_MODULE_NAME("video");
  69
  70 MODULE_AUTHOR("Bruno Ducrot");
  71 MODULE_DESCRIPTION("ACPI Video Driver");
  72 MODULE_LICENSE("GPL");
  73
  74 static int acpi_video_bus_add(struct acpi_device *device);
  75 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  76
  77 static const struct acpi_device_id video_device_ids[] = {
  78         {ACPI_VIDEO_HID, 0},
  79         {"", 0},
  80 };
  81 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  82
  83 static struct acpi_driver acpi_video_bus = {
  84         .name = "video",
  85         .class = ACPI_VIDEO_CLASS,
  86         .ids = video_device_ids,
  87         .ops = {
  88                 .add = acpi_video_bus_add,
  89                 .remove = acpi_video_bus_remove,
  90                 },
  91 };
  92
  93 struct acpi_video_bus_flags {
  94         u8 multihead:1;         /* can switch video heads */
  95         u8 rom:1;               /* can retrieve a video rom */
  96         u8 post:1;              /* can configure the head to */
  97         u8 reserved:5;
  98 };
  99
 100 struct acpi_video_bus_cap {
 101         u8 _DOS:1;              /*Enable/Disable output switching */
 102         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 103         u8 _ROM:1;              /*Get ROM Data */
 104         u8 _GPD:1;              /*Get POST Device */
 105         u8 _SPD:1;              /*Set POST Device */
 106         u8 _VPO:1;              /*Video POST Options */
 107         u8 reserved:2;
 108 };
 109
 110 struct acpi_video_device_attrib {
 111         u32 display_index:4;    /* A zero-based instance of the Display */
 112         u32 display_port_attachment:4;  /*This field differentiates the display type */
 113         u32 display_type:4;     /*Describe the specific type in use */
 114         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 115         u32 bios_can_detect:1;  /*BIOS can detect the device */
 116         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 117                                    the VGA device. */
 118         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 119         u32 reserved:10;        /*Must be 0 */
 120         u32 device_id_scheme:1; /*Device ID Scheme */
 121 };
 122
 123 struct acpi_video_enumerated_device {
 124         union {
 125                 u32 int_val;
 126                 struct acpi_video_device_attrib attrib;
 127         } value;
 128         struct acpi_video_device *bind_info;
 129 };
 130
 131 struct acpi_video_bus {
 132         struct acpi_device *device;
 133         u8 dos_setting;
 134         struct acpi_video_enumerated_device *attached_array;
 135         u8 attached_count;
 136         struct acpi_video_bus_cap cap;
 137         struct acpi_video_bus_flags flags;
 138         struct semaphore sem;
 139         struct list_head video_device_list;
 140         struct proc_dir_entry *dir;
 141         struct input_dev *input;
 142         char phys[32];  /* for input device */
 143 };
 144
 145 struct acpi_video_device_flags {
 146         u8 crt:1;
 147         u8 lcd:1;
 148         u8 tvout:1;
 149         u8 dvi:1;
 150         u8 bios:1;
 151         u8 unknown:1;
 152         u8 reserved:2;
 153 };
 154
 155 struct acpi_video_device_cap {
 156         u8 _ADR:1;              /*Return the unique ID */
 157         u8 _BCL:1;              /*Query list of brightness control levels supported */
 158         u8 _BCM:1;              /*Set the brightness level */
 159         u8 _BQC:1;              /* Get current brightness level */
 160         u8 _DDC:1;              /*Return the EDID for this device */
 161         u8 _DCS:1;              /*Return status of output device */
 162         u8 _DGS:1;              /*Query graphics state */
 163         u8 _DSS:1;              /*Device state set */
 164 };
 165
 166 struct acpi_video_device_brightness {
 167         int curr;
 168         int count;
 169         int *levels;
 170 };
 171
 172 struct acpi_video_device {
 173         unsigned long device_id;
 174         struct acpi_video_device_flags flags;
 175         struct acpi_video_device_cap cap;
 176         struct list_head entry;
 177         struct acpi_video_bus *video;
 178         struct acpi_device *dev;
 179         struct acpi_video_device_brightness *brightness;
 180         struct backlight_device *backlight;
 181         struct output_device *output_dev;
 182 };
 183
 184 /* bus */
 185 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 186 static struct file_operations acpi_video_bus_info_fops = {
 187         .open = acpi_video_bus_info_open_fs,
 188         .read = seq_read,
 189         .llseek = seq_lseek,
 190         .release = single_release,
 191 };
 192
 193 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 194 static struct file_operations acpi_video_bus_ROM_fops = {
 195         .open = acpi_video_bus_ROM_open_fs,
 196         .read = seq_read,
 197         .llseek = seq_lseek,
 198         .release = single_release,
 199 };
 200
 201 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 202                                             struct file *file);
 203 static struct file_operations acpi_video_bus_POST_info_fops = {
 204         .open = acpi_video_bus_POST_info_open_fs,
 205         .read = seq_read,
 206         .llseek = seq_lseek,
 207         .release = single_release,
 208 };
 209
 210 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 211 static struct file_operations acpi_video_bus_POST_fops = {
 212         .open = acpi_video_bus_POST_open_fs,
 213         .read = seq_read,
 214         .llseek = seq_lseek,
 215         .release = single_release,
 216 };
 217
 218 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 219 static struct file_operations acpi_video_bus_DOS_fops = {
 220         .open = acpi_video_bus_DOS_open_fs,
 221         .read = seq_read,
 222         .llseek = seq_lseek,
 223         .release = single_release,
 224 };
 225
 226 /* device */
 227 static int acpi_video_device_info_open_fs(struct inode *inode,
 228                                           struct file *file);
 229 static struct file_operations acpi_video_device_info_fops = {
 230         .open = acpi_video_device_info_open_fs,
 231         .read = seq_read,
 232         .llseek = seq_lseek,
 233         .release = single_release,
 234 };
 235
 236 static int acpi_video_device_state_open_fs(struct inode *inode,
 237                                            struct file *file);
 238 static struct file_operations acpi_video_device_state_fops = {
 239         .open = acpi_video_device_state_open_fs,
 240         .read = seq_read,
 241         .llseek = seq_lseek,
 242         .release = single_release,
 243 };
 244
 245 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 246                                                 struct file *file);
 247 static struct file_operations acpi_video_device_brightness_fops = {
 248         .open = acpi_video_device_brightness_open_fs,
 249         .read = seq_read,
 250         .llseek = seq_lseek,
 251         .release = single_release,
 252 };
 253
 254 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 255                                           struct file *file);
 256 static struct file_operations acpi_video_device_EDID_fops = {
 257         .open = acpi_video_device_EDID_open_fs,
 258         .read = seq_read,
 259         .llseek = seq_lseek,
 260         .release = single_release,
 261 };
 262
 263 static char device_decode[][30] = {
 264         "motherboard VGA device",
 265         "PCI VGA device",
 266         "AGP VGA device",
 267         "UNKNOWN",
 268 };
 269
 270 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 271 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 272 static void acpi_video_device_bind(struct acpi_video_bus *video,
 273                                    struct acpi_video_device *device);
 274 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 275 static int acpi_video_switch_output(struct acpi_video_bus *video, int event);
 276 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 277                         int level);
 278 static int acpi_video_device_lcd_get_level_current(
 279                         struct acpi_video_device *device,
 280                         unsigned long *level);
 281 static int acpi_video_get_next_level(struct acpi_video_device *device,
 282                                      u32 level_current, u32 event);
 283 static void acpi_video_switch_brightness(struct acpi_video_device *device,
 284                                          int event);
 285 static int acpi_video_device_get_state(struct acpi_video_device *device,
 286                             unsigned long *state);
 287 static int acpi_video_output_get(struct output_device *od);
 288 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 289
 290 /*backlight device sysfs support*/
 291 static int acpi_video_get_brightness(struct backlight_device *bd)
 292 {
 293         unsigned long cur_level;
 294         struct acpi_video_device *vd =
 295                 (struct acpi_video_device *)bl_get_data(bd);
 296         acpi_video_device_lcd_get_level_current(vd, &cur_level);
 297         return (int) cur_level;
 298 }
 299
 300 static int acpi_video_set_brightness(struct backlight_device *bd)
 301 {
 302         int request_level = bd->props.brightness;
 303         struct acpi_video_device *vd =
 304                 (struct acpi_video_device *)bl_get_data(bd);
 305         acpi_video_device_lcd_set_level(vd, request_level);
 306         return 0;
 307 }
 308
 309 static struct backlight_ops acpi_backlight_ops = {
 310         .get_brightness = acpi_video_get_brightness,
 311         .update_status  = acpi_video_set_brightness,
 312 };
 313
 314 /*video output device sysfs support*/
 315 static int acpi_video_output_get(struct output_device *od)
 316 {
 317         unsigned long state;
 318         struct acpi_video_device *vd =
 319                 (struct acpi_video_device *)class_get_devdata(&od->class_dev);
 320         acpi_video_device_get_state(vd, &state);
 321         return (int)state;
 322 }
 323
 324 static int acpi_video_output_set(struct output_device *od)
 325 {
 326         unsigned long state = od->request_state;
 327         struct acpi_video_device *vd=
 328                 (struct acpi_video_device *)class_get_devdata(&od->class_dev);
 329         return acpi_video_device_set_state(vd, state);
 330 }
 331
 332 static struct output_properties acpi_output_properties = {
 333         .set_state = acpi_video_output_set,
 334         .get_status = acpi_video_output_get,
 335 };
 336 /* --------------------------------------------------------------------------
 337                                Video Management
 338    -------------------------------------------------------------------------- */
 339
 340 /* device */
 341
 342 static int
 343 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
 344 {
 345         int status;
 346
 347         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 348
 349         return status;
 350 }
 351
 352 static int
 353 acpi_video_device_get_state(struct acpi_video_device *device,
 354                             unsigned long *state)
 355 {
 356         int status;
 357
 358         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 359
 360         return status;
 361 }
 362
 363 static int
 364 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 365 {
 366         int status;
 367         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 368         struct acpi_object_list args = { 1, &arg0 };
 369         unsigned long ret;
 370
 371
 372         arg0.integer.value = state;
 373         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 374
 375         return status;
 376 }
 377
 378 static int
 379 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 380                                    union acpi_object **levels)
 381 {
 382         int status;
 383         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 384         union acpi_object *obj;
 385
 386
 387         *levels = NULL;
 388
 389         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 390         if (!ACPI_SUCCESS(status))
 391                 return status;
 392         obj = (union acpi_object *)buffer.pointer;
 393         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 394                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 395                 status = -EFAULT;
 396                 goto err;
 397         }
 398
 399         *levels = obj;
 400
 401         return 0;
 402
 403       err:
 404         kfree(buffer.pointer);
 405
 406         return status;
 407 }
 408
 409 static int
 410 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 411 {
 412         int status;
 413         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 414         struct acpi_object_list args = { 1, &arg0 };
 415
 416
 417         arg0.integer.value = level;
 418         status = acpi_evaluate_object(device->dev->handle, "_BCM", &args, NULL);
 419
 420         printk(KERN_DEBUG "set_level status: %x\n", status);
 421         return status;
 422 }
 423
 424 static int
 425 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 426                                         unsigned long *level)
 427 {
 428         int status;
 429
 430         status = acpi_evaluate_integer(device->dev->handle, "_BQC", NULL, level);
 431
 432         return status;
 433 }
 434
 435 static int
 436 acpi_video_device_EDID(struct acpi_video_device *device,
 437                        union acpi_object **edid, ssize_t length)
 438 {
 439         int status;
 440         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 441         union acpi_object *obj;
 442         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 443         struct acpi_object_list args = { 1, &arg0 };
 444
 445
 446         *edid = NULL;
 447
 448         if (!device)
 449                 return -ENODEV;
 450         if (length == 128)
 451                 arg0.integer.value = 1;
 452         else if (length == 256)
 453                 arg0.integer.value = 2;
 454         else
 455                 return -EINVAL;
 456
 457         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 458         if (ACPI_FAILURE(status))
 459                 return -ENODEV;
 460
 461         obj = buffer.pointer;
 462
 463         if (obj && obj->type == ACPI_TYPE_BUFFER)
 464                 *edid = obj;
 465         else {
 466                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 467                 status = -EFAULT;
 468                 kfree(obj);
 469         }
 470
 471         return status;
 472 }
 473
 474 /* bus */
 475
 476 static int
 477 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 478 {
 479         int status;
 480         unsigned long tmp;
 481         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 482         struct acpi_object_list args = { 1, &arg0 };
 483
 484
 485         arg0.integer.value = option;
 486
 487         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 488         if (ACPI_SUCCESS(status))
 489                 status = tmp ? (-EINVAL) : (AE_OK);
 490
 491         return status;
 492 }
 493
 494 static int
 495 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
 496 {
 497         int status;
 498
 499         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 500
 501         return status;
 502 }
 503
 504 static int
 505 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 506                             unsigned long *options)
 507 {
 508         int status;
 509
 510         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 511         *options &= 3;
 512
 513         return status;
 514 }
 515
 516 /*
 517  *  Arg:
 518  *      video           : video bus device pointer
 519  *      bios_flag       :
 520  *              0.      The system BIOS should NOT automatically switch(toggle)
 521  *                      the active display output.
 522  *              1.      The system BIOS should automatically switch (toggle) the
 523  *                      active display output. No switch event.
 524  *              2.      The _DGS value should be locked.
 525  *              3.      The system BIOS should not automatically switch (toggle) the
 526  *                      active display output, but instead generate the display switch
 527  *                      event notify code.
 528  *      lcd_flag        :
 529  *              0.      The system BIOS should automatically control the brightness level
 530  *                      of the LCD when the power changes from AC to DC
 531  *              1.      The system BIOS should NOT automatically control the brightness
 532  *                      level of the LCD when the power changes from AC to DC.
 533  * Return Value:
 534  *              -1      wrong arg.
 535  */
 536
 537 static int
 538 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 539 {
 540         acpi_integer status = 0;
 541         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 542         struct acpi_object_list args = { 1, &arg0 };
 543
 544
 545         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 546                 status = -1;
 547                 goto Failed;
 548         }
 549         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 550         video->dos_setting = arg0.integer.value;
 551         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 552
 553       Failed:
 554         return status;
 555 }
 556
 557 /*
 558  *  Arg:
 559  *      device  : video output device (LCD, CRT, ..)
 560  *
 561  *  Return Value:
 562  *      None
 563  *
 564  *  Find out all required AML methods defined under the output
 565  *  device.
 566  */
 567
 568 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 569 {
 570         acpi_handle h_dummy1;
 571         int i;
 572         u32 max_level = 0;
 573         union acpi_object *obj = NULL;
 574         struct acpi_video_device_brightness *br = NULL;
 575
 576
 577         memset(&device->cap, 0, 4);
 578
 579         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 580                 device->cap._ADR = 1;
 581         }
 582         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 583                 device->cap._BCL = 1;
 584         }
 585         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 586                 device->cap._BCM = 1;
 587         }
 588         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 589                 device->cap._BQC = 1;
 590         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 591                 device->cap._DDC = 1;
 592         }
 593         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 594                 device->cap._DCS = 1;
 595         }
 596         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 597                 device->cap._DGS = 1;
 598         }
 599         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 600                 device->cap._DSS = 1;
 601         }
 602
 603         if (ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 604
 605                 if (obj->package.count >= 2) {
 606                         int count = 0;
 607                         union acpi_object *o;
 608
 609                         br = kzalloc(sizeof(*br), GFP_KERNEL);
 610                         if (!br) {
 611                                 printk(KERN_ERR "can't allocate memory\n");
 612                         } else {
 613                                 br->levels = kmalloc(obj->package.count *
 614                                                      sizeof *(br->levels), GFP_KERNEL);
 615                                 if (!br->levels)
 616                                         goto out;
 617
 618                                 for (i = 0; i < obj->package.count; i++) {
 619                                         o = (union acpi_object *)&obj->package.
 620                                             elements[i];
 621                                         if (o->type != ACPI_TYPE_INTEGER) {
 622                                                 printk(KERN_ERR PREFIX "Invalid data\n");
 623                                                 continue;
 624                                         }
 625                                         br->levels[count] = (u32) o->integer.value;
 626
 627                                         if (br->levels[count] > max_level)
 628                                                 max_level = br->levels[count];
 629                                         count++;
 630                                 }
 631                               out:
 632                                 if (count < 2) {
 633                                         kfree(br->levels);
 634                                         kfree(br);
 635                                 } else {
 636                                         br->count = count;
 637                                         device->brightness = br;
 638                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 639                                                           "found %d brightness levels\n",
 640                                                           count));
 641                                 }
 642                         }
 643                 }
 644
 645         } else {
 646                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available LCD brightness level\n"));
 647         }
 648
 649         kfree(obj);
 650
 651         if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
 652                 unsigned long tmp;
 653                 static int count = 0;
 654                 char *name;
 655                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 656                 if (!name)
 657                         return;
 658
 659                 sprintf(name, "acpi_video%d", count++);
 660                 acpi_video_device_lcd_get_level_current(device, &tmp);
 661                 device->backlight = backlight_device_register(name,
 662                         NULL, device, &acpi_backlight_ops);
 663                 device->backlight->props.max_brightness = max_level;
 664                 device->backlight->props.brightness = (int)tmp;
 665                 backlight_update_status(device->backlight);
 666
 667                 kfree(name);
 668         }
 669         if (device->cap._DCS && device->cap._DSS){
 670                 static int count = 0;
 671                 char *name;
 672                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 673                 if (!name)
 674                         return;
 675                 sprintf(name, "acpi_video%d", count++);
 676                 device->output_dev = video_output_register(name,
 677                                 NULL, device, &acpi_output_properties);
 678                 kfree(name);
 679         }
 680         return;
 681 }
 682
 683 /*
 684  *  Arg:
 685  *      device  : video output device (VGA)
 686  *
 687  *  Return Value:
 688  *      None
 689  *
 690  *  Find out all required AML methods defined under the video bus device.
 691  */
 692
 693 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 694 {
 695         acpi_handle h_dummy1;
 696
 697         memset(&video->cap, 0, 4);
 698         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 699                 video->cap._DOS = 1;
 700         }
 701         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 702                 video->cap._DOD = 1;
 703         }
 704         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 705                 video->cap._ROM = 1;
 706         }
 707         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 708                 video->cap._GPD = 1;
 709         }
 710         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 711                 video->cap._SPD = 1;
 712         }
 713         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 714                 video->cap._VPO = 1;
 715         }
 716 }
 717
 718 /*
 719  * Check whether the video bus device has required AML method to
 720  * support the desired features
 721  */
 722
 723 static int acpi_video_bus_check(struct acpi_video_bus *video)
 724 {
 725         acpi_status status = -ENOENT;
 726
 727
 728         if (!video)
 729                 return -EINVAL;
 730
 731         /* Since there is no HID, CID and so on for VGA driver, we have
 732          * to check well known required nodes.
 733          */
 734
 735         /* Does this device support video switching? */
 736         if (video->cap._DOS) {
 737                 video->flags.multihead = 1;
 738                 status = 0;
 739         }
 740
 741         /* Does this device support retrieving a video ROM? */
 742         if (video->cap._ROM) {
 743                 video->flags.rom = 1;
 744                 status = 0;
 745         }
 746
 747         /* Does this device support configuring which video device to POST? */
 748         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 749                 video->flags.post = 1;
 750                 status = 0;
 751         }
 752
 753         return status;
 754 }
 755
 756 /* --------------------------------------------------------------------------
 757                               FS Interface (/proc)
 758    -------------------------------------------------------------------------- */
 759
 760 static struct proc_dir_entry *acpi_video_dir;
 761
 762 /* video devices */
 763
 764 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 765 {
 766         struct acpi_video_device *dev = seq->private;
 767
 768
 769         if (!dev)
 770                 goto end;
 771
 772         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 773         seq_printf(seq, "type:         ");
 774         if (dev->flags.crt)
 775                 seq_printf(seq, "CRT\n");
 776         else if (dev->flags.lcd)
 777                 seq_printf(seq, "LCD\n");
 778         else if (dev->flags.tvout)
 779                 seq_printf(seq, "TVOUT\n");
 780         else if (dev->flags.dvi)
 781                 seq_printf(seq, "DVI\n");
 782         else
 783                 seq_printf(seq, "UNKNOWN\n");
 784
 785         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 786
 787       end:
 788         return 0;
 789 }
 790
 791 static int
 792 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 793 {
 794         return single_open(file, acpi_video_device_info_seq_show,
 795                            PDE(inode)->data);
 796 }
 797
 798 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 799 {
 800         int status;
 801         struct acpi_video_device *dev = seq->private;
 802         unsigned long state;
 803
 804
 805         if (!dev)
 806                 goto end;
 807
 808         status = acpi_video_device_get_state(dev, &state);
 809         seq_printf(seq, "state:     ");
 810         if (ACPI_SUCCESS(status))
 811                 seq_printf(seq, "0x%02lx\n", state);
 812         else
 813                 seq_printf(seq, "<not supported>\n");
 814
 815         status = acpi_video_device_query(dev, &state);
 816         seq_printf(seq, "query:     ");
 817         if (ACPI_SUCCESS(status))
 818                 seq_printf(seq, "0x%02lx\n", state);
 819         else
 820                 seq_printf(seq, "<not supported>\n");
 821
 822       end:
 823         return 0;
 824 }
 825
 826 static int
 827 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 828 {
 829         return single_open(file, acpi_video_device_state_seq_show,
 830                            PDE(inode)->data);
 831 }
 832
 833 static ssize_t
 834 acpi_video_device_write_state(struct file *file,
 835                               const char __user * buffer,
 836                               size_t count, loff_t * data)
 837 {
 838         int status;
 839         struct seq_file *m = file->private_data;
 840         struct acpi_video_device *dev = m->private;
 841         char str[12] = { 0 };
 842         u32 state = 0;
 843
 844
 845         if (!dev || count + 1 > sizeof str)
 846                 return -EINVAL;
 847
 848         if (copy_from_user(str, buffer, count))
 849                 return -EFAULT;
 850
 851         str[count] = 0;
 852         state = simple_strtoul(str, NULL, 0);
 853         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
 854
 855         status = acpi_video_device_set_state(dev, state);
 856
 857         if (status)
 858                 return -EFAULT;
 859
 860         return count;
 861 }
 862
 863 static int
 864 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
 865 {
 866         struct acpi_video_device *dev = seq->private;
 867         int i;
 868
 869
 870         if (!dev || !dev->brightness) {
 871                 seq_printf(seq, "<not supported>\n");
 872                 return 0;
 873         }
 874
 875         seq_printf(seq, "levels: ");
 876         for (i = 0; i < dev->brightness->count; i++)
 877                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 878         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 879
 880         return 0;
 881 }
 882
 883 static int
 884 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
 885 {
 886         return single_open(file, acpi_video_device_brightness_seq_show,
 887                            PDE(inode)->data);
 888 }
 889
 890 static ssize_t
 891 acpi_video_device_write_brightness(struct file *file,
 892                                    const char __user * buffer,
 893                                    size_t count, loff_t * data)
 894 {
 895         struct seq_file *m = file->private_data;
 896         struct acpi_video_device *dev = m->private;
 897         char str[4] = { 0 };
 898         unsigned int level = 0;
 899         int i;
 900
 901
 902         if (!dev || !dev->brightness || count + 1 > sizeof str)
 903                 return -EINVAL;
 904
 905         if (copy_from_user(str, buffer, count))
 906                 return -EFAULT;
 907
 908         str[count] = 0;
 909         level = simple_strtoul(str, NULL, 0);
 910
 911         if (level > 100)
 912                 return -EFAULT;
 913
 914         /* validate through the list of available levels */
 915         for (i = 0; i < dev->brightness->count; i++)
 916                 if (level == dev->brightness->levels[i]) {
 917                         if (ACPI_SUCCESS
 918                             (acpi_video_device_lcd_set_level(dev, level)))
 919                                 dev->brightness->curr = level;
 920                         break;
 921                 }
 922
 923         return count;
 924 }
 925
 926 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
 927 {
 928         struct acpi_video_device *dev = seq->private;
 929         int status;
 930         int i;
 931         union acpi_object *edid = NULL;
 932
 933
 934         if (!dev)
 935                 goto out;
 936
 937         status = acpi_video_device_EDID(dev, &edid, 128);
 938         if (ACPI_FAILURE(status)) {
 939                 status = acpi_video_device_EDID(dev, &edid, 256);
 940         }
 941
 942         if (ACPI_FAILURE(status)) {
 943                 goto out;
 944         }
 945
 946         if (edid && edid->type == ACPI_TYPE_BUFFER) {
 947                 for (i = 0; i < edid->buffer.length; i++)
 948                         seq_putc(seq, edid->buffer.pointer[i]);
 949         }
 950
 951       out:
 952         if (!edid)
 953                 seq_printf(seq, "<not supported>\n");
 954         else
 955                 kfree(edid);
 956
 957         return 0;
 958 }
 959
 960 static int
 961 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
 962 {
 963         return single_open(file, acpi_video_device_EDID_seq_show,
 964                            PDE(inode)->data);
 965 }
 966
 967 static int acpi_video_device_add_fs(struct acpi_device *device)
 968 {
 969         struct proc_dir_entry *entry = NULL;
 970         struct acpi_video_device *vid_dev;
 971
 972
 973         if (!device)
 974                 return -ENODEV;
 975
 976         vid_dev = acpi_driver_data(device);
 977         if (!vid_dev)
 978                 return -ENODEV;
 979
 980         if (!acpi_device_dir(device)) {
 981                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 982                                                      vid_dev->video->dir);
 983                 if (!acpi_device_dir(device))
 984                         return -ENODEV;
 985                 acpi_device_dir(device)->owner = THIS_MODULE;
 986         }
 987
 988         /* 'info' [R] */
 989         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
 990         if (!entry)
 991                 return -ENODEV;
 992         else {
 993                 entry->proc_fops = &acpi_video_device_info_fops;
 994                 entry->data = acpi_driver_data(device);
 995                 entry->owner = THIS_MODULE;
 996         }
 997
 998         /* 'state' [R/W] */
 999         entry =
1000             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
1001                               acpi_device_dir(device));
1002         if (!entry)
1003                 return -ENODEV;
1004         else {
1005                 acpi_video_device_state_fops.write = acpi_video_device_write_state;
1006                 entry->proc_fops = &acpi_video_device_state_fops;
1007                 entry->data = acpi_driver_data(device);
1008                 entry->owner = THIS_MODULE;
1009         }
1010
1011         /* 'brightness' [R/W] */
1012         entry =
1013             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1014                               acpi_device_dir(device));
1015         if (!entry)
1016                 return -ENODEV;
1017         else {
1018                 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
1019                 entry->proc_fops = &acpi_video_device_brightness_fops;
1020                 entry->data = acpi_driver_data(device);
1021                 entry->owner = THIS_MODULE;
1022         }
1023
1024         /* 'EDID' [R] */
1025         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
1026         if (!entry)
1027                 return -ENODEV;
1028         else {
1029                 entry->proc_fops = &acpi_video_device_EDID_fops;
1030                 entry->data = acpi_driver_data(device);
1031                 entry->owner = THIS_MODULE;
1032         }
1033
1034         return 0;
1035 }
1036
1037 static int acpi_video_device_remove_fs(struct acpi_device *device)
1038 {
1039         struct acpi_video_device *vid_dev;
1040
1041         vid_dev = acpi_driver_data(device);
1042         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1043                 return -ENODEV;
1044
1045         if (acpi_device_dir(device)) {
1046                 remove_proc_entry("info", acpi_device_dir(device));
1047                 remove_proc_entry("state", acpi_device_dir(device));
1048                 remove_proc_entry("brightness", acpi_device_dir(device));
1049                 remove_proc_entry("EDID", acpi_device_dir(device));
1050                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1051                 acpi_device_dir(device) = NULL;
1052         }
1053
1054         return 0;
1055 }
1056
1057 /* video bus */
1058 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1059 {
1060         struct acpi_video_bus *video = seq->private;
1061
1062
1063         if (!video)
1064                 goto end;
1065
1066         seq_printf(seq, "Switching heads:              %s\n",
1067                    video->flags.multihead ? "yes" : "no");
1068         seq_printf(seq, "Video ROM:                    %s\n",
1069                    video->flags.rom ? "yes" : "no");
1070         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1071                    video->flags.post ? "yes" : "no");
1072
1073       end:
1074         return 0;
1075 }
1076
1077 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1078 {
1079         return single_open(file, acpi_video_bus_info_seq_show,
1080                            PDE(inode)->data);
1081 }
1082
1083 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1084 {
1085         struct acpi_video_bus *video = seq->private;
1086
1087
1088         if (!video)
1089                 goto end;
1090
1091         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
1092         seq_printf(seq, "<TODO>\n");
1093
1094       end:
1095         return 0;
1096 }
1097
1098 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1099 {
1100         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1101 }
1102
1103 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1104 {
1105         struct acpi_video_bus *video = seq->private;
1106         unsigned long options;
1107         int status;
1108
1109
1110         if (!video)
1111                 goto end;
1112
1113         status = acpi_video_bus_POST_options(video, &options);
1114         if (ACPI_SUCCESS(status)) {
1115                 if (!(options & 1)) {
1116                         printk(KERN_WARNING PREFIX
1117                                "The motherboard VGA device is not listed as a possible POST device.\n");
1118                         printk(KERN_WARNING PREFIX
1119                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1120                 }
1121                 printk("%lx\n", options);
1122                 seq_printf(seq, "can POST: <integrated video>");
1123                 if (options & 2)
1124                         seq_printf(seq, " <PCI video>");
1125                 if (options & 4)
1126                         seq_printf(seq, " <AGP video>");
1127                 seq_putc(seq, '\n');
1128         } else
1129                 seq_printf(seq, "<not supported>\n");
1130       end:
1131         return 0;
1132 }
1133
1134 static int
1135 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1136 {
1137         return single_open(file, acpi_video_bus_POST_info_seq_show,
1138                            PDE(inode)->data);
1139 }
1140
1141 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1142 {
1143         struct acpi_video_bus *video = seq->private;
1144         int status;
1145         unsigned long id;
1146
1147
1148         if (!video)
1149                 goto end;
1150
1151         status = acpi_video_bus_get_POST(video, &id);
1152         if (!ACPI_SUCCESS(status)) {
1153                 seq_printf(seq, "<not supported>\n");
1154                 goto end;
1155         }
1156         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1157
1158       end:
1159         return 0;
1160 }
1161
1162 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1163 {
1164         struct acpi_video_bus *video = seq->private;
1165
1166
1167         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1168
1169         return 0;
1170 }
1171
1172 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1173 {
1174         return single_open(file, acpi_video_bus_POST_seq_show,
1175                            PDE(inode)->data);
1176 }
1177
1178 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1179 {
1180         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1181 }
1182
1183 static ssize_t
1184 acpi_video_bus_write_POST(struct file *file,
1185                           const char __user * buffer,
1186                           size_t count, loff_t * data)
1187 {
1188         int status;
1189         struct seq_file *m = file->private_data;
1190         struct acpi_video_bus *video = m->private;
1191         char str[12] = { 0 };
1192         unsigned long opt, options;
1193
1194
1195         if (!video || count + 1 > sizeof str)
1196                 return -EINVAL;
1197
1198         status = acpi_video_bus_POST_options(video, &options);
1199         if (!ACPI_SUCCESS(status))
1200                 return -EINVAL;
1201
1202         if (copy_from_user(str, buffer, count))
1203                 return -EFAULT;
1204
1205         str[count] = 0;
1206         opt = strtoul(str, NULL, 0);
1207         if (opt > 3)
1208                 return -EFAULT;
1209
1210         /* just in case an OEM 'forgot' the motherboard... */
1211         options |= 1;
1212
1213         if (options & (1ul << opt)) {
1214                 status = acpi_video_bus_set_POST(video, opt);
1215                 if (!ACPI_SUCCESS(status))
1216                         return -EFAULT;
1217
1218         }
1219
1220         return count;
1221 }
1222
1223 static ssize_t
1224 acpi_video_bus_write_DOS(struct file *file,
1225                          const char __user * buffer,
1226                          size_t count, loff_t * data)
1227 {
1228         int status;
1229         struct seq_file *m = file->private_data;
1230         struct acpi_video_bus *video = m->private;
1231         char str[12] = { 0 };
1232         unsigned long opt;
1233
1234
1235         if (!video || count + 1 > sizeof str)
1236                 return -EINVAL;
1237
1238         if (copy_from_user(str, buffer, count))
1239                 return -EFAULT;
1240
1241         str[count] = 0;
1242         opt = strtoul(str, NULL, 0);
1243         if (opt > 7)
1244                 return -EFAULT;
1245
1246         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1247
1248         if (!ACPI_SUCCESS(status))
1249                 return -EFAULT;
1250
1251         return count;
1252 }
1253
1254 static int acpi_video_bus_add_fs(struct acpi_device *device)
1255 {
1256         struct proc_dir_entry *entry = NULL;
1257         struct acpi_video_bus *video;
1258
1259
1260         video = acpi_driver_data(device);
1261
1262         if (!acpi_device_dir(device)) {
1263                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1264                                                      acpi_video_dir);
1265                 if (!acpi_device_dir(device))
1266                         return -ENODEV;
1267                 video->dir = acpi_device_dir(device);
1268                 acpi_device_dir(device)->owner = THIS_MODULE;
1269         }
1270
1271         /* 'info' [R] */
1272         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1273         if (!entry)
1274                 return -ENODEV;
1275         else {
1276                 entry->proc_fops = &acpi_video_bus_info_fops;
1277                 entry->data = acpi_driver_data(device);
1278                 entry->owner = THIS_MODULE;
1279         }
1280
1281         /* 'ROM' [R] */
1282         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1283         if (!entry)
1284                 return -ENODEV;
1285         else {
1286                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1287                 entry->data = acpi_driver_data(device);
1288                 entry->owner = THIS_MODULE;
1289         }
1290
1291         /* 'POST_info' [R] */
1292         entry =
1293             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1294         if (!entry)
1295                 return -ENODEV;
1296         else {
1297                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1298                 entry->data = acpi_driver_data(device);
1299                 entry->owner = THIS_MODULE;
1300         }
1301
1302         /* 'POST' [R/W] */
1303         entry =
1304             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1305                               acpi_device_dir(device));
1306         if (!entry)
1307                 return -ENODEV;
1308         else {
1309                 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1310                 entry->proc_fops = &acpi_video_bus_POST_fops;
1311                 entry->data = acpi_driver_data(device);
1312                 entry->owner = THIS_MODULE;
1313         }
1314
1315         /* 'DOS' [R/W] */
1316         entry =
1317             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1318                               acpi_device_dir(device));
1319         if (!entry)
1320                 return -ENODEV;
1321         else {
1322                 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1323                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1324                 entry->data = acpi_driver_data(device);
1325                 entry->owner = THIS_MODULE;
1326         }
1327
1328         return 0;
1329 }
1330
1331 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1332 {
1333         struct acpi_video_bus *video;
1334
1335
1336         video = acpi_driver_data(device);
1337
1338         if (acpi_device_dir(device)) {
1339                 remove_proc_entry("info", acpi_device_dir(device));
1340                 remove_proc_entry("ROM", acpi_device_dir(device));
1341                 remove_proc_entry("POST_info", acpi_device_dir(device));
1342                 remove_proc_entry("POST", acpi_device_dir(device));
1343                 remove_proc_entry("DOS", acpi_device_dir(device));
1344                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1345                 acpi_device_dir(device) = NULL;
1346         }
1347
1348         return 0;
1349 }
1350
1351 /* --------------------------------------------------------------------------
1352                                  Driver Interface
1353    -------------------------------------------------------------------------- */
1354
1355 /* device interface */
1356 static struct acpi_video_device_attrib*
1357 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1358 {
1359         int count;
1360
1361         for(count = 0; count < video->attached_count; count++)
1362                 if((video->attached_array[count].value.int_val & 0xffff) == device_id)
1363                         return &(video->attached_array[count].value.attrib);
1364         return NULL;
1365 }
1366
1367 static int
1368 acpi_video_bus_get_one_device(struct acpi_device *device,
1369                               struct acpi_video_bus *video)
1370 {
1371         unsigned long device_id;
1372         int status;
1373         struct acpi_video_device *data;
1374         struct acpi_video_device_attrib* attribute;
1375
1376         if (!device || !video)
1377                 return -EINVAL;
1378
1379         status =
1380             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1381         if (ACPI_SUCCESS(status)) {
1382
1383                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1384                 if (!data)
1385                         return -ENOMEM;
1386
1387                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1388                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1389                 acpi_driver_data(device) = data;
1390
1391                 data->device_id = device_id;
1392                 data->video = video;
1393                 data->dev = device;
1394
1395                 attribute = acpi_video_get_device_attr(video, device_id);
1396
1397                 if((attribute != NULL) && attribute->device_id_scheme) {
1398                         switch (attribute->display_type) {
1399                         case ACPI_VIDEO_DISPLAY_CRT:
1400                                 data->flags.crt = 1;
1401                                 break;
1402                         case ACPI_VIDEO_DISPLAY_TV:
1403                                 data->flags.tvout = 1;
1404                                 break;
1405                         case ACPI_VIDEO_DISPLAY_DVI:
1406                                 data->flags.dvi = 1;
1407                                 break;
1408                         case ACPI_VIDEO_DISPLAY_LCD:
1409                                 data->flags.lcd = 1;
1410                                 break;
1411                         default:
1412                                 data->flags.unknown = 1;
1413                                 break;
1414                         }
1415                         if(attribute->bios_can_detect)
1416                                 data->flags.bios = 1;
1417                 } else
1418                         data->flags.unknown = 1;
1419
1420                 acpi_video_device_bind(video, data);
1421                 acpi_video_device_find_cap(data);
1422
1423                 status = acpi_install_notify_handler(device->handle,
1424                                                      ACPI_DEVICE_NOTIFY,
1425                                                      acpi_video_device_notify,
1426                                                      data);
1427                 if (ACPI_FAILURE(status)) {
1428                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1429                                           "Error installing notify handler\n"));
1430                         if(data->brightness)
1431                                 kfree(data->brightness->levels);
1432                         kfree(data->brightness);
1433                         kfree(data);
1434                         return -ENODEV;
1435                 }
1436
1437                 down(&video->sem);
1438                 list_add_tail(&data->entry, &video->video_device_list);
1439                 up(&video->sem);
1440
1441                 acpi_video_device_add_fs(device);
1442
1443                 return 0;
1444         }
1445
1446         return -ENOENT;
1447 }
1448
1449 /*
1450  *  Arg:
1451  *      video   : video bus device
1452  *
1453  *  Return:
1454  *      none
1455  *
1456  *  Enumerate the video device list of the video bus,
1457  *  bind the ids with the corresponding video devices
1458  *  under the video bus.
1459  */
1460
1461 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1462 {
1463         struct list_head *node, *next;
1464         list_for_each_safe(node, next, &video->video_device_list) {
1465                 struct acpi_video_device *dev =
1466                     container_of(node, struct acpi_video_device, entry);
1467                 acpi_video_device_bind(video, dev);
1468         }
1469 }
1470
1471 /*
1472  *  Arg:
1473  *      video   : video bus device
1474  *      device  : video output device under the video
1475  *              bus
1476  *
1477  *  Return:
1478  *      none
1479  *
1480  *  Bind the ids with the corresponding video devices
1481  *  under the video bus.
1482  */
1483
1484 static void
1485 acpi_video_device_bind(struct acpi_video_bus *video,
1486                        struct acpi_video_device *device)
1487 {
1488         int i;
1489
1490 #define IDS_VAL(i) video->attached_array[i].value.int_val
1491 #define IDS_BIND(i) video->attached_array[i].bind_info
1492
1493         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1494              i < video->attached_count; i++) {
1495                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1496                         IDS_BIND(i) = device;
1497                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1498                 }
1499         }
1500 #undef IDS_VAL
1501 #undef IDS_BIND
1502 }
1503
1504 /*
1505  *  Arg:
1506  *      video   : video bus device
1507  *
1508  *  Return:
1509  *      < 0     : error
1510  *
1511  *  Call _DOD to enumerate all devices attached to display adapter
1512  *
1513  */
1514
1515 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1516 {
1517         int status;
1518         int count;
1519         int i;
1520         struct acpi_video_enumerated_device *active_device_list;
1521         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1522         union acpi_object *dod = NULL;
1523         union acpi_object *obj;
1524
1525         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1526         if (!ACPI_SUCCESS(status)) {
1527                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1528                 return status;
1529         }
1530
1531         dod = buffer.pointer;
1532         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1533                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1534                 status = -EFAULT;
1535                 goto out;
1536         }
1537
1538         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1539                           dod->package.count));
1540
1541         active_device_list = kmalloc((1 +
1542                                       dod->package.count) *
1543                                      sizeof(struct
1544                                             acpi_video_enumerated_device),
1545                                      GFP_KERNEL);
1546
1547         if (!active_device_list) {
1548                 status = -ENOMEM;
1549                 goto out;
1550         }
1551
1552         count = 0;
1553         for (i = 0; i < dod->package.count; i++) {
1554                 obj = &dod->package.elements[i];
1555
1556                 if (obj->type != ACPI_TYPE_INTEGER) {
1557                         printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1558                         active_device_list[i].value.int_val =
1559                             ACPI_VIDEO_HEAD_INVALID;
1560                 }
1561                 active_device_list[i].value.int_val = obj->integer.value;
1562                 active_device_list[i].bind_info = NULL;
1563                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1564                                   (int)obj->integer.value));
1565                 count++;
1566         }
1567         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1568
1569         kfree(video->attached_array);
1570
1571         video->attached_array = active_device_list;
1572         video->attached_count = count;
1573       out:
1574         kfree(buffer.pointer);
1575         return status;
1576 }
1577
1578 /*
1579  *  Arg:
1580  *      video   : video bus device
1581  *      event   : notify event
1582  *
1583  *  Return:
1584  *      < 0     : error
1585  *
1586  *      1. Find out the current active output device.
1587  *      2. Identify the next output device to switch to.
1588  *      3. call _DSS to do actual switch.
1589  */
1590
1591 static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
1592 {
1593         struct list_head *node, *next;
1594         struct acpi_video_device *dev = NULL;
1595         struct acpi_video_device *dev_next = NULL;
1596         struct acpi_video_device *dev_prev = NULL;
1597         unsigned long state;
1598         int status = 0;
1599
1600
1601         list_for_each_safe(node, next, &video->video_device_list) {
1602                 dev = container_of(node, struct acpi_video_device, entry);
1603                 status = acpi_video_device_get_state(dev, &state);
1604                 if (state & 0x2) {
1605                         dev_next =
1606                             container_of(node->next, struct acpi_video_device,
1607                                          entry);
1608                         dev_prev =
1609                             container_of(node->prev, struct acpi_video_device,
1610                                          entry);
1611                         goto out;
1612                 }
1613         }
1614         dev_next = container_of(node->next, struct acpi_video_device, entry);
1615         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1616       out:
1617         switch (event) {
1618         case ACPI_VIDEO_NOTIFY_CYCLE:
1619         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
1620                 acpi_video_device_set_state(dev, 0);
1621                 acpi_video_device_set_state(dev_next, 0x80000001);
1622                 break;
1623         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
1624                 acpi_video_device_set_state(dev, 0);
1625                 acpi_video_device_set_state(dev_prev, 0x80000001);
1626         default:
1627                 break;
1628         }
1629
1630         return status;
1631 }
1632
1633 static int
1634 acpi_video_get_next_level(struct acpi_video_device *device,
1635                           u32 level_current, u32 event)
1636 {
1637         int min, max, min_above, max_below, i, l;
1638         max = max_below = 0;
1639         min = min_above = 255;
1640         for (i = 0; i < device->brightness->count; i++) {
1641                 l = device->brightness->levels[i];
1642                 if (l < min)
1643                         min = l;
1644                 if (l > max)
1645                         max = l;
1646                 if (l < min_above && l > level_current)
1647                         min_above = l;
1648                 if (l > max_below && l < level_current)
1649                         max_below = l;
1650         }
1651
1652         switch (event) {
1653         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1654                 return (level_current < max) ? min_above : min;
1655         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1656                 return (level_current < max) ? min_above : max;
1657         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1658                 return (level_current > min) ? max_below : min;
1659         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1660         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1661                 return 0;
1662         default:
1663                 return level_current;
1664         }
1665 }
1666
1667 static void
1668 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1669 {
1670         unsigned long level_current, level_next;
1671         acpi_video_device_lcd_get_level_current(device, &level_current);
1672         level_next = acpi_video_get_next_level(device, level_current, event);
1673         acpi_video_device_lcd_set_level(device, level_next);
1674 }
1675
1676 static int
1677 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1678                            struct acpi_device *device)
1679 {
1680         int status = 0;
1681         struct list_head *node, *next;
1682
1683
1684         acpi_video_device_enumerate(video);
1685
1686         list_for_each_safe(node, next, &device->children) {
1687                 struct acpi_device *dev =
1688                     list_entry(node, struct acpi_device, node);
1689
1690                 if (!dev)
1691                         continue;
1692
1693                 status = acpi_video_bus_get_one_device(dev, video);
1694                 if (ACPI_FAILURE(status)) {
1695                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1696                         continue;
1697                 }
1698
1699         }
1700         return status;
1701 }
1702
1703 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1704 {
1705         acpi_status status;
1706         struct acpi_video_bus *video;
1707
1708
1709         if (!device || !device->video)
1710                 return -ENOENT;
1711
1712         video = device->video;
1713
1714         down(&video->sem);
1715         list_del(&device->entry);
1716         up(&video->sem);
1717         acpi_video_device_remove_fs(device->dev);
1718
1719         status = acpi_remove_notify_handler(device->dev->handle,
1720                                             ACPI_DEVICE_NOTIFY,
1721                                             acpi_video_device_notify);
1722         backlight_device_unregister(device->backlight);
1723         video_output_unregister(device->output_dev);
1724         return 0;
1725 }
1726
1727 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1728 {
1729         int status;
1730         struct list_head *node, *next;
1731
1732
1733         list_for_each_safe(node, next, &video->video_device_list) {
1734                 struct acpi_video_device *data =
1735                     list_entry(node, struct acpi_video_device, entry);
1736                 if (!data)
1737                         continue;
1738
1739                 status = acpi_video_bus_put_one_device(data);
1740                 if (ACPI_FAILURE(status))
1741                         printk(KERN_WARNING PREFIX
1742                                "hhuuhhuu bug in acpi video driver.\n");
1743
1744                 if (data->brightness)
1745                         kfree(data->brightness->levels);
1746                 kfree(data->brightness);
1747                 kfree(data);
1748         }
1749
1750         return 0;
1751 }
1752
1753 /* acpi_video interface */
1754
1755 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1756 {
1757         return acpi_video_bus_DOS(video, 0, 0);
1758 }
1759
1760 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1761 {
1762         return acpi_video_bus_DOS(video, 0, 1);
1763 }
1764
1765 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1766 {
1767         struct acpi_video_bus *video = data;
1768         struct acpi_device *device = NULL;
1769         struct input_dev *input;
1770         int keycode;
1771
1772
1773         printk("video bus notify\n");
1774
1775         if (!video)
1776                 return;
1777
1778         device = video->device;
1779         input = video->input;
1780
1781         switch (event) {
1782         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1783                                          * most likely via hotkey. */
1784                 acpi_bus_generate_proc_event(device, event, 0);
1785                 keycode = KEY_SWITCHVIDEOMODE;
1786                 break;
1787
1788         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1789                                          * connector. */
1790                 acpi_video_device_enumerate(video);
1791                 acpi_video_device_rebind(video);
1792                 acpi_video_switch_output(video, event);
1793                 acpi_bus_generate_proc_event(device, event, 0);
1794                 keycode = KEY_SWITCHVIDEOMODE;
1795                 break;
1796
1797         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1798                 acpi_video_switch_output(video, event);
1799                 acpi_bus_generate_proc_event(device, event, 0);
1800                 keycode = KEY_SWITCHVIDEOMODE;
1801                 break;
1802         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1803                 acpi_video_switch_output(video, event);
1804                 acpi_bus_generate_proc_event(device, event, 0);
1805                 keycode = KEY_VIDEO_NEXT;
1806                 break;
1807         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1808                 acpi_video_switch_output(video, event);
1809                 acpi_bus_generate_proc_event(device, event, 0);
1810                 keycode = KEY_VIDEO_PREV;
1811                 break;
1812
1813         default:
1814                 keycode = KEY_UNKNOWN;
1815                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1816                                   "Unsupported event [0x%x]\n", event));
1817                 break;
1818         }
1819
1820         input_report_key(input, keycode, 1);
1821         input_sync(input);
1822         input_report_key(input, keycode, 0);
1823         input_sync(input);
1824
1825         return;
1826 }
1827
1828 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1829 {
1830         struct acpi_video_device *video_device = data;
1831         struct acpi_device *device = NULL;
1832         struct acpi_video_bus *bus;
1833         struct input_dev *input;
1834         int keycode;
1835
1836         if (!video_device)
1837                 return;
1838
1839         device = video_device->dev;
1840         bus = video_device->video;
1841         input = bus->input;
1842
1843         switch (event) {
1844         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1845                 acpi_video_switch_brightness(video_device, event);
1846                 acpi_bus_generate_proc_event(device, event, 0);
1847                 keycode = KEY_BRIGHTNESS_CYCLE;
1848                 break;
1849         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1850                 acpi_video_switch_brightness(video_device, event);
1851                 acpi_bus_generate_proc_event(device, event, 0);
1852                 keycode = KEY_BRIGHTNESSUP;
1853                 break;
1854         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1855                 acpi_video_switch_brightness(video_device, event);
1856                 acpi_bus_generate_proc_event(device, event, 0);
1857                 keycode = KEY_BRIGHTNESSDOWN;
1858                 break;
1859         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1860                 acpi_video_switch_brightness(video_device, event);
1861                 acpi_bus_generate_proc_event(device, event, 0);
1862                 keycode = KEY_BRIGHTNESS_ZERO;
1863                 break;
1864         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1865                 acpi_video_switch_brightness(video_device, event);
1866                 acpi_bus_generate_proc_event(device, event, 0);
1867                 keycode = KEY_DISPLAY_OFF;
1868                 break;
1869         default:
1870                 keycode = KEY_UNKNOWN;
1871                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1872                                   "Unsupported event [0x%x]\n", event));
1873                 break;
1874         }
1875
1876         input_report_key(input, keycode, 1);
1877         input_sync(input);
1878         input_report_key(input, keycode, 0);
1879         input_sync(input);
1880
1881         return;
1882 }
1883
1884 static int instance;
1885 static int acpi_video_bus_add(struct acpi_device *device)
1886 {
1887         int result = 0;
1888         acpi_status status = 0;
1889         struct acpi_video_bus *video = NULL;
1890         struct input_dev *input;
1891
1892
1893         if (!device)
1894                 return -EINVAL;
1895
1896         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1897         if (!video)
1898                 return -ENOMEM;
1899
1900         /* a hack to fix the duplicate name "VID" problem on T61 */
1901         if (!strcmp(device->pnp.bus_id, "VID")) {
1902                 if (instance)
1903                         device->pnp.bus_id[3] = '0' + instance;
1904                 instance ++;
1905         }
1906
1907         video->device = device;
1908         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1909         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1910         acpi_driver_data(device) = video;
1911
1912         acpi_video_bus_find_cap(video);
1913         result = acpi_video_bus_check(video);
1914         if (result)
1915                 goto end;
1916
1917         result = acpi_video_bus_add_fs(device);
1918         if (result)
1919                 goto end;
1920
1921         init_MUTEX(&video->sem);
1922         INIT_LIST_HEAD(&video->video_device_list);
1923
1924         acpi_video_bus_get_devices(video, device);
1925         acpi_video_bus_start_devices(video);
1926
1927         status = acpi_install_notify_handler(device->handle,
1928                                              ACPI_DEVICE_NOTIFY,
1929                                              acpi_video_bus_notify, video);
1930         if (ACPI_FAILURE(status)) {
1931                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1932                                   "Error installing notify handler\n"));
1933                 acpi_video_bus_stop_devices(video);
1934                 acpi_video_bus_put_devices(video);
1935                 kfree(video->attached_array);
1936                 acpi_video_bus_remove_fs(device);
1937                 result = -ENODEV;
1938                 goto end;
1939         }
1940
1941
1942         video->input = input = input_allocate_device();
1943
1944         snprintf(video->phys, sizeof(video->phys),
1945                 "%s/video/input0", acpi_device_hid(video->device));
1946
1947         input->name = acpi_device_name(video->device);
1948         input->phys = video->phys;
1949         input->id.bustype = BUS_HOST;
1950         input->id.product = 0x06;
1951         input->evbit[0] = BIT(EV_KEY);
1952         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1953         set_bit(KEY_VIDEO_NEXT, input->keybit);
1954         set_bit(KEY_VIDEO_PREV, input->keybit);
1955         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1956         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1957         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1958         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1959         set_bit(KEY_DISPLAY_OFF, input->keybit);
1960         set_bit(KEY_UNKNOWN, input->keybit);
1961         result = input_register_device(input);
1962         if (result) {
1963                 acpi_remove_notify_handler(video->device->handle,
1964                                                 ACPI_DEVICE_NOTIFY,
1965                                                 acpi_video_bus_notify);
1966                 acpi_video_bus_stop_devices(video);
1967                 acpi_video_bus_put_devices(video);
1968                 kfree(video->attached_array);
1969                 acpi_video_bus_remove_fs(device);
1970                 goto end;
1971         }
1972
1973
1974         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1975                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1976                video->flags.multihead ? "yes" : "no",
1977                video->flags.rom ? "yes" : "no",
1978                video->flags.post ? "yes" : "no");
1979
1980       end:
1981         if (result)
1982                 kfree(video);
1983
1984         return result;
1985 }
1986
1987 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1988 {
1989         acpi_status status = 0;
1990         struct acpi_video_bus *video = NULL;
1991
1992
1993         if (!device || !acpi_driver_data(device))
1994                 return -EINVAL;
1995
1996         video = acpi_driver_data(device);
1997
1998         acpi_video_bus_stop_devices(video);
1999
2000         status = acpi_remove_notify_handler(video->device->handle,
2001                                             ACPI_DEVICE_NOTIFY,
2002                                             acpi_video_bus_notify);
2003
2004         acpi_video_bus_put_devices(video);
2005         acpi_video_bus_remove_fs(device);
2006
2007         input_unregister_device(video->input);
2008         kfree(video->attached_array);
2009         kfree(video);
2010
2011         return 0;
2012 }
2013
2014 static int __init acpi_video_init(void)
2015 {
2016         int result = 0;
2017
2018
2019         /*
2020            acpi_dbg_level = 0xFFFFFFFF;
2021            acpi_dbg_layer = 0x08000000;
2022          */
2023
2024         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2025         if (!acpi_video_dir)
2026                 return -ENODEV;
2027         acpi_video_dir->owner = THIS_MODULE;
2028
2029         result = acpi_bus_register_driver(&acpi_video_bus);
2030         if (result < 0) {
2031                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2032                 return -ENODEV;
2033         }
2034
2035         return 0;
2036 }
2037
2038 static void __exit acpi_video_exit(void)
2039 {
2040
2041         acpi_bus_unregister_driver(&acpi_video_bus);
2042
2043         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2044
2045         return;
2046 }
2047
2048 module_init(acpi_video_init);
2049 module_exit(acpi_video_exit);