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   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 *)dev_get_drvdata(&od->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 *)dev_get_drvdata(&od->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 = AE_OK;
 413         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 414         struct acpi_object_list args = { 1, &arg0 };
 415
 416
 417         arg0.integer.value = level;
 418
 419         if (device->cap._BCM)
 420                 status = acpi_evaluate_object(device->dev->handle, "_BCM",
 421                                               &args, NULL);
 422         device->brightness->curr = level;
 423         return status;
 424 }
 425
 426 static int
 427 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 428                                         unsigned long *level)
 429 {
 430         if (device->cap._BQC)
 431                 return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
 432                                              level);
 433         *level = device->brightness->curr;
 434         return AE_OK;
 435 }
 436
 437 static int
 438 acpi_video_device_EDID(struct acpi_video_device *device,
 439                        union acpi_object **edid, ssize_t length)
 440 {
 441         int status;
 442         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 443         union acpi_object *obj;
 444         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 445         struct acpi_object_list args = { 1, &arg0 };
 446
 447
 448         *edid = NULL;
 449
 450         if (!device)
 451                 return -ENODEV;
 452         if (length == 128)
 453                 arg0.integer.value = 1;
 454         else if (length == 256)
 455                 arg0.integer.value = 2;
 456         else
 457                 return -EINVAL;
 458
 459         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 460         if (ACPI_FAILURE(status))
 461                 return -ENODEV;
 462
 463         obj = buffer.pointer;
 464
 465         if (obj && obj->type == ACPI_TYPE_BUFFER)
 466                 *edid = obj;
 467         else {
 468                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 469                 status = -EFAULT;
 470                 kfree(obj);
 471         }
 472
 473         return status;
 474 }
 475
 476 /* bus */
 477
 478 static int
 479 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 480 {
 481         int status;
 482         unsigned long tmp;
 483         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 484         struct acpi_object_list args = { 1, &arg0 };
 485
 486
 487         arg0.integer.value = option;
 488
 489         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 490         if (ACPI_SUCCESS(status))
 491                 status = tmp ? (-EINVAL) : (AE_OK);
 492
 493         return status;
 494 }
 495
 496 static int
 497 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
 498 {
 499         int status;
 500
 501         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 502
 503         return status;
 504 }
 505
 506 static int
 507 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 508                             unsigned long *options)
 509 {
 510         int status;
 511
 512         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 513         *options &= 3;
 514
 515         return status;
 516 }
 517
 518 /*
 519  *  Arg:
 520  *      video           : video bus device pointer
 521  *      bios_flag       :
 522  *              0.      The system BIOS should NOT automatically switch(toggle)
 523  *                      the active display output.
 524  *              1.      The system BIOS should automatically switch (toggle) the
 525  *                      active display output. No switch event.
 526  *              2.      The _DGS value should be locked.
 527  *              3.      The system BIOS should not automatically switch (toggle) the
 528  *                      active display output, but instead generate the display switch
 529  *                      event notify code.
 530  *      lcd_flag        :
 531  *              0.      The system BIOS should automatically control the brightness level
 532  *                      of the LCD when the power changes from AC to DC
 533  *              1.      The system BIOS should NOT automatically control the brightness
 534  *                      level of the LCD when the power changes from AC to DC.
 535  * Return Value:
 536  *              -1      wrong arg.
 537  */
 538
 539 static int
 540 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 541 {
 542         acpi_integer status = 0;
 543         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 544         struct acpi_object_list args = { 1, &arg0 };
 545
 546
 547         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 548                 status = -1;
 549                 goto Failed;
 550         }
 551         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 552         video->dos_setting = arg0.integer.value;
 553         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 554
 555       Failed:
 556         return status;
 557 }
 558
 559 /*
 560  *  Arg:
 561  *      device  : video output device (LCD, CRT, ..)
 562  *
 563  *  Return Value:
 564  *      None
 565  *
 566  *  Find out all required AML methods defined under the output
 567  *  device.
 568  */
 569
 570 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 571 {
 572         acpi_handle h_dummy1;
 573         int i;
 574         u32 max_level = 0;
 575         union acpi_object *obj = NULL;
 576         struct acpi_video_device_brightness *br = NULL;
 577
 578
 579         memset(&device->cap, 0, 4);
 580
 581         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 582                 device->cap._ADR = 1;
 583         }
 584         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 585                 device->cap._BCL = 1;
 586         }
 587         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 588                 device->cap._BCM = 1;
 589         }
 590         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 591                 device->cap._BQC = 1;
 592         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 593                 device->cap._DDC = 1;
 594         }
 595         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 596                 device->cap._DCS = 1;
 597         }
 598         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 599                 device->cap._DGS = 1;
 600         }
 601         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 602                 device->cap._DSS = 1;
 603         }
 604
 605         if (ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 606
 607                 if (obj->package.count >= 2) {
 608                         int count = 0;
 609                         union acpi_object *o;
 610
 611                         br = kzalloc(sizeof(*br), GFP_KERNEL);
 612                         if (!br) {
 613                                 printk(KERN_ERR "can't allocate memory\n");
 614                         } else {
 615                                 br->levels = kmalloc(obj->package.count *
 616                                                      sizeof *(br->levels), GFP_KERNEL);
 617                                 if (!br->levels)
 618                                         goto out;
 619
 620                                 for (i = 0; i < obj->package.count; i++) {
 621                                         o = (union acpi_object *)&obj->package.
 622                                             elements[i];
 623                                         if (o->type != ACPI_TYPE_INTEGER) {
 624                                                 printk(KERN_ERR PREFIX "Invalid data\n");
 625                                                 continue;
 626                                         }
 627                                         br->levels[count] = (u32) o->integer.value;
 628
 629                                         if (br->levels[count] > max_level)
 630                                                 max_level = br->levels[count];
 631                                         count++;
 632                                 }
 633                               out:
 634                                 if (count < 2) {
 635                                         kfree(br->levels);
 636                                         kfree(br);
 637                                 } else {
 638                                         br->count = count;
 639                                         device->brightness = br;
 640                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 641                                                           "found %d brightness levels\n",
 642                                                           count));
 643                                 }
 644                         }
 645                 }
 646
 647         } else {
 648                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available LCD brightness level\n"));
 649         }
 650
 651         kfree(obj);
 652
 653         if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
 654                 unsigned long tmp;
 655                 static int count = 0;
 656                 char *name;
 657                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 658                 if (!name)
 659                         return;
 660
 661                 sprintf(name, "acpi_video%d", count++);
 662                 acpi_video_device_lcd_get_level_current(device, &tmp);
 663                 device->backlight = backlight_device_register(name,
 664                         NULL, device, &acpi_backlight_ops);
 665                 device->backlight->props.max_brightness = max_level;
 666                 device->backlight->props.brightness = (int)tmp;
 667                 backlight_update_status(device->backlight);
 668
 669                 kfree(name);
 670         }
 671         if (device->cap._DCS && device->cap._DSS){
 672                 static int count = 0;
 673                 char *name;
 674                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 675                 if (!name)
 676                         return;
 677                 sprintf(name, "acpi_video%d", count++);
 678                 device->output_dev = video_output_register(name,
 679                                 NULL, device, &acpi_output_properties);
 680                 kfree(name);
 681         }
 682         return;
 683 }
 684
 685 /*
 686  *  Arg:
 687  *      device  : video output device (VGA)
 688  *
 689  *  Return Value:
 690  *      None
 691  *
 692  *  Find out all required AML methods defined under the video bus device.
 693  */
 694
 695 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 696 {
 697         acpi_handle h_dummy1;
 698
 699         memset(&video->cap, 0, 4);
 700         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 701                 video->cap._DOS = 1;
 702         }
 703         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 704                 video->cap._DOD = 1;
 705         }
 706         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 707                 video->cap._ROM = 1;
 708         }
 709         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 710                 video->cap._GPD = 1;
 711         }
 712         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 713                 video->cap._SPD = 1;
 714         }
 715         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 716                 video->cap._VPO = 1;
 717         }
 718 }
 719
 720 /*
 721  * Check whether the video bus device has required AML method to
 722  * support the desired features
 723  */
 724
 725 static int acpi_video_bus_check(struct acpi_video_bus *video)
 726 {
 727         acpi_status status = -ENOENT;
 728
 729
 730         if (!video)
 731                 return -EINVAL;
 732
 733         /* Since there is no HID, CID and so on for VGA driver, we have
 734          * to check well known required nodes.
 735          */
 736
 737         /* Does this device support video switching? */
 738         if (video->cap._DOS) {
 739                 video->flags.multihead = 1;
 740                 status = 0;
 741         }
 742
 743         /* Does this device support retrieving a video ROM? */
 744         if (video->cap._ROM) {
 745                 video->flags.rom = 1;
 746                 status = 0;
 747         }
 748
 749         /* Does this device support configuring which video device to POST? */
 750         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 751                 video->flags.post = 1;
 752                 status = 0;
 753         }
 754
 755         return status;
 756 }
 757
 758 /* --------------------------------------------------------------------------
 759                               FS Interface (/proc)
 760    -------------------------------------------------------------------------- */
 761
 762 static struct proc_dir_entry *acpi_video_dir;
 763
 764 /* video devices */
 765
 766 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 767 {
 768         struct acpi_video_device *dev = seq->private;
 769
 770
 771         if (!dev)
 772                 goto end;
 773
 774         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 775         seq_printf(seq, "type:         ");
 776         if (dev->flags.crt)
 777                 seq_printf(seq, "CRT\n");
 778         else if (dev->flags.lcd)
 779                 seq_printf(seq, "LCD\n");
 780         else if (dev->flags.tvout)
 781                 seq_printf(seq, "TVOUT\n");
 782         else if (dev->flags.dvi)
 783                 seq_printf(seq, "DVI\n");
 784         else
 785                 seq_printf(seq, "UNKNOWN\n");
 786
 787         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 788
 789       end:
 790         return 0;
 791 }
 792
 793 static int
 794 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 795 {
 796         return single_open(file, acpi_video_device_info_seq_show,
 797                            PDE(inode)->data);
 798 }
 799
 800 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 801 {
 802         int status;
 803         struct acpi_video_device *dev = seq->private;
 804         unsigned long state;
 805
 806
 807         if (!dev)
 808                 goto end;
 809
 810         status = acpi_video_device_get_state(dev, &state);
 811         seq_printf(seq, "state:     ");
 812         if (ACPI_SUCCESS(status))
 813                 seq_printf(seq, "0x%02lx\n", state);
 814         else
 815                 seq_printf(seq, "<not supported>\n");
 816
 817         status = acpi_video_device_query(dev, &state);
 818         seq_printf(seq, "query:     ");
 819         if (ACPI_SUCCESS(status))
 820                 seq_printf(seq, "0x%02lx\n", state);
 821         else
 822                 seq_printf(seq, "<not supported>\n");
 823
 824       end:
 825         return 0;
 826 }
 827
 828 static int
 829 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 830 {
 831         return single_open(file, acpi_video_device_state_seq_show,
 832                            PDE(inode)->data);
 833 }
 834
 835 static ssize_t
 836 acpi_video_device_write_state(struct file *file,
 837                               const char __user * buffer,
 838                               size_t count, loff_t * data)
 839 {
 840         int status;
 841         struct seq_file *m = file->private_data;
 842         struct acpi_video_device *dev = m->private;
 843         char str[12] = { 0 };
 844         u32 state = 0;
 845
 846
 847         if (!dev || count + 1 > sizeof str)
 848                 return -EINVAL;
 849
 850         if (copy_from_user(str, buffer, count))
 851                 return -EFAULT;
 852
 853         str[count] = 0;
 854         state = simple_strtoul(str, NULL, 0);
 855         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
 856
 857         status = acpi_video_device_set_state(dev, state);
 858
 859         if (status)
 860                 return -EFAULT;
 861
 862         return count;
 863 }
 864
 865 static int
 866 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
 867 {
 868         struct acpi_video_device *dev = seq->private;
 869         int i;
 870
 871
 872         if (!dev || !dev->brightness) {
 873                 seq_printf(seq, "<not supported>\n");
 874                 return 0;
 875         }
 876
 877         seq_printf(seq, "levels: ");
 878         for (i = 0; i < dev->brightness->count; i++)
 879                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 880         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 881
 882         return 0;
 883 }
 884
 885 static int
 886 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
 887 {
 888         return single_open(file, acpi_video_device_brightness_seq_show,
 889                            PDE(inode)->data);
 890 }
 891
 892 static ssize_t
 893 acpi_video_device_write_brightness(struct file *file,
 894                                    const char __user * buffer,
 895                                    size_t count, loff_t * data)
 896 {
 897         struct seq_file *m = file->private_data;
 898         struct acpi_video_device *dev = m->private;
 899         char str[4] = { 0 };
 900         unsigned int level = 0;
 901         int i;
 902
 903
 904         if (!dev || !dev->brightness || count + 1 > sizeof str)
 905                 return -EINVAL;
 906
 907         if (copy_from_user(str, buffer, count))
 908                 return -EFAULT;
 909
 910         str[count] = 0;
 911         level = simple_strtoul(str, NULL, 0);
 912
 913         if (level > 100)
 914                 return -EFAULT;
 915
 916         /* validate through the list of available levels */
 917         for (i = 0; i < dev->brightness->count; i++)
 918                 if (level == dev->brightness->levels[i]) {
 919                         if (ACPI_SUCCESS
 920                             (acpi_video_device_lcd_set_level(dev, level)))
 921                                 dev->brightness->curr = level;
 922                         break;
 923                 }
 924
 925         return count;
 926 }
 927
 928 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
 929 {
 930         struct acpi_video_device *dev = seq->private;
 931         int status;
 932         int i;
 933         union acpi_object *edid = NULL;
 934
 935
 936         if (!dev)
 937                 goto out;
 938
 939         status = acpi_video_device_EDID(dev, &edid, 128);
 940         if (ACPI_FAILURE(status)) {
 941                 status = acpi_video_device_EDID(dev, &edid, 256);
 942         }
 943
 944         if (ACPI_FAILURE(status)) {
 945                 goto out;
 946         }
 947
 948         if (edid && edid->type == ACPI_TYPE_BUFFER) {
 949                 for (i = 0; i < edid->buffer.length; i++)
 950                         seq_putc(seq, edid->buffer.pointer[i]);
 951         }
 952
 953       out:
 954         if (!edid)
 955                 seq_printf(seq, "<not supported>\n");
 956         else
 957                 kfree(edid);
 958
 959         return 0;
 960 }
 961
 962 static int
 963 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
 964 {
 965         return single_open(file, acpi_video_device_EDID_seq_show,
 966                            PDE(inode)->data);
 967 }
 968
 969 static int acpi_video_device_add_fs(struct acpi_device *device)
 970 {
 971         struct proc_dir_entry *entry = NULL;
 972         struct acpi_video_device *vid_dev;
 973
 974
 975         if (!device)
 976                 return -ENODEV;
 977
 978         vid_dev = acpi_driver_data(device);
 979         if (!vid_dev)
 980                 return -ENODEV;
 981
 982         if (!acpi_device_dir(device)) {
 983                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 984                                                      vid_dev->video->dir);
 985                 if (!acpi_device_dir(device))
 986                         return -ENODEV;
 987                 acpi_device_dir(device)->owner = THIS_MODULE;
 988         }
 989
 990         /* 'info' [R] */
 991         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
 992         if (!entry)
 993                 return -ENODEV;
 994         else {
 995                 entry->proc_fops = &acpi_video_device_info_fops;
 996                 entry->data = acpi_driver_data(device);
 997                 entry->owner = THIS_MODULE;
 998         }
 999
1000         /* 'state' [R/W] */
1001         entry =
1002             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
1003                               acpi_device_dir(device));
1004         if (!entry)
1005                 return -ENODEV;
1006         else {
1007                 acpi_video_device_state_fops.write = acpi_video_device_write_state;
1008                 entry->proc_fops = &acpi_video_device_state_fops;
1009                 entry->data = acpi_driver_data(device);
1010                 entry->owner = THIS_MODULE;
1011         }
1012
1013         /* 'brightness' [R/W] */
1014         entry =
1015             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1016                               acpi_device_dir(device));
1017         if (!entry)
1018                 return -ENODEV;
1019         else {
1020                 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
1021                 entry->proc_fops = &acpi_video_device_brightness_fops;
1022                 entry->data = acpi_driver_data(device);
1023                 entry->owner = THIS_MODULE;
1024         }
1025
1026         /* 'EDID' [R] */
1027         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
1028         if (!entry)
1029                 return -ENODEV;
1030         else {
1031                 entry->proc_fops = &acpi_video_device_EDID_fops;
1032                 entry->data = acpi_driver_data(device);
1033                 entry->owner = THIS_MODULE;
1034         }
1035
1036         return 0;
1037 }
1038
1039 static int acpi_video_device_remove_fs(struct acpi_device *device)
1040 {
1041         struct acpi_video_device *vid_dev;
1042
1043         vid_dev = acpi_driver_data(device);
1044         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1045                 return -ENODEV;
1046
1047         if (acpi_device_dir(device)) {
1048                 remove_proc_entry("info", acpi_device_dir(device));
1049                 remove_proc_entry("state", acpi_device_dir(device));
1050                 remove_proc_entry("brightness", acpi_device_dir(device));
1051                 remove_proc_entry("EDID", acpi_device_dir(device));
1052                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1053                 acpi_device_dir(device) = NULL;
1054         }
1055
1056         return 0;
1057 }
1058
1059 /* video bus */
1060 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1061 {
1062         struct acpi_video_bus *video = seq->private;
1063
1064
1065         if (!video)
1066                 goto end;
1067
1068         seq_printf(seq, "Switching heads:              %s\n",
1069                    video->flags.multihead ? "yes" : "no");
1070         seq_printf(seq, "Video ROM:                    %s\n",
1071                    video->flags.rom ? "yes" : "no");
1072         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1073                    video->flags.post ? "yes" : "no");
1074
1075       end:
1076         return 0;
1077 }
1078
1079 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1080 {
1081         return single_open(file, acpi_video_bus_info_seq_show,
1082                            PDE(inode)->data);
1083 }
1084
1085 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1086 {
1087         struct acpi_video_bus *video = seq->private;
1088
1089
1090         if (!video)
1091                 goto end;
1092
1093         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
1094         seq_printf(seq, "<TODO>\n");
1095
1096       end:
1097         return 0;
1098 }
1099
1100 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1101 {
1102         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1103 }
1104
1105 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1106 {
1107         struct acpi_video_bus *video = seq->private;
1108         unsigned long options;
1109         int status;
1110
1111
1112         if (!video)
1113                 goto end;
1114
1115         status = acpi_video_bus_POST_options(video, &options);
1116         if (ACPI_SUCCESS(status)) {
1117                 if (!(options & 1)) {
1118                         printk(KERN_WARNING PREFIX
1119                                "The motherboard VGA device is not listed as a possible POST device.\n");
1120                         printk(KERN_WARNING PREFIX
1121                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1122                 }
1123                 printk("%lx\n", options);
1124                 seq_printf(seq, "can POST: <integrated video>");
1125                 if (options & 2)
1126                         seq_printf(seq, " <PCI video>");
1127                 if (options & 4)
1128                         seq_printf(seq, " <AGP video>");
1129                 seq_putc(seq, '\n');
1130         } else
1131                 seq_printf(seq, "<not supported>\n");
1132       end:
1133         return 0;
1134 }
1135
1136 static int
1137 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1138 {
1139         return single_open(file, acpi_video_bus_POST_info_seq_show,
1140                            PDE(inode)->data);
1141 }
1142
1143 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1144 {
1145         struct acpi_video_bus *video = seq->private;
1146         int status;
1147         unsigned long id;
1148
1149
1150         if (!video)
1151                 goto end;
1152
1153         status = acpi_video_bus_get_POST(video, &id);
1154         if (!ACPI_SUCCESS(status)) {
1155                 seq_printf(seq, "<not supported>\n");
1156                 goto end;
1157         }
1158         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1159
1160       end:
1161         return 0;
1162 }
1163
1164 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1165 {
1166         struct acpi_video_bus *video = seq->private;
1167
1168
1169         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1170
1171         return 0;
1172 }
1173
1174 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1175 {
1176         return single_open(file, acpi_video_bus_POST_seq_show,
1177                            PDE(inode)->data);
1178 }
1179
1180 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1181 {
1182         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1183 }
1184
1185 static ssize_t
1186 acpi_video_bus_write_POST(struct file *file,
1187                           const char __user * buffer,
1188                           size_t count, loff_t * data)
1189 {
1190         int status;
1191         struct seq_file *m = file->private_data;
1192         struct acpi_video_bus *video = m->private;
1193         char str[12] = { 0 };
1194         unsigned long opt, options;
1195
1196
1197         if (!video || count + 1 > sizeof str)
1198                 return -EINVAL;
1199
1200         status = acpi_video_bus_POST_options(video, &options);
1201         if (!ACPI_SUCCESS(status))
1202                 return -EINVAL;
1203
1204         if (copy_from_user(str, buffer, count))
1205                 return -EFAULT;
1206
1207         str[count] = 0;
1208         opt = strtoul(str, NULL, 0);
1209         if (opt > 3)
1210                 return -EFAULT;
1211
1212         /* just in case an OEM 'forgot' the motherboard... */
1213         options |= 1;
1214
1215         if (options & (1ul << opt)) {
1216                 status = acpi_video_bus_set_POST(video, opt);
1217                 if (!ACPI_SUCCESS(status))
1218                         return -EFAULT;
1219
1220         }
1221
1222         return count;
1223 }
1224
1225 static ssize_t
1226 acpi_video_bus_write_DOS(struct file *file,
1227                          const char __user * buffer,
1228                          size_t count, loff_t * data)
1229 {
1230         int status;
1231         struct seq_file *m = file->private_data;
1232         struct acpi_video_bus *video = m->private;
1233         char str[12] = { 0 };
1234         unsigned long opt;
1235
1236
1237         if (!video || count + 1 > sizeof str)
1238                 return -EINVAL;
1239
1240         if (copy_from_user(str, buffer, count))
1241                 return -EFAULT;
1242
1243         str[count] = 0;
1244         opt = strtoul(str, NULL, 0);
1245         if (opt > 7)
1246                 return -EFAULT;
1247
1248         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1249
1250         if (!ACPI_SUCCESS(status))
1251                 return -EFAULT;
1252
1253         return count;
1254 }
1255
1256 static int acpi_video_bus_add_fs(struct acpi_device *device)
1257 {
1258         struct proc_dir_entry *entry = NULL;
1259         struct acpi_video_bus *video;
1260
1261
1262         video = acpi_driver_data(device);
1263
1264         if (!acpi_device_dir(device)) {
1265                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1266                                                      acpi_video_dir);
1267                 if (!acpi_device_dir(device))
1268                         return -ENODEV;
1269                 video->dir = acpi_device_dir(device);
1270                 acpi_device_dir(device)->owner = THIS_MODULE;
1271         }
1272
1273         /* 'info' [R] */
1274         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1275         if (!entry)
1276                 return -ENODEV;
1277         else {
1278                 entry->proc_fops = &acpi_video_bus_info_fops;
1279                 entry->data = acpi_driver_data(device);
1280                 entry->owner = THIS_MODULE;
1281         }
1282
1283         /* 'ROM' [R] */
1284         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1285         if (!entry)
1286                 return -ENODEV;
1287         else {
1288                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1289                 entry->data = acpi_driver_data(device);
1290                 entry->owner = THIS_MODULE;
1291         }
1292
1293         /* 'POST_info' [R] */
1294         entry =
1295             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1296         if (!entry)
1297                 return -ENODEV;
1298         else {
1299                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1300                 entry->data = acpi_driver_data(device);
1301                 entry->owner = THIS_MODULE;
1302         }
1303
1304         /* 'POST' [R/W] */
1305         entry =
1306             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1307                               acpi_device_dir(device));
1308         if (!entry)
1309                 return -ENODEV;
1310         else {
1311                 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1312                 entry->proc_fops = &acpi_video_bus_POST_fops;
1313                 entry->data = acpi_driver_data(device);
1314                 entry->owner = THIS_MODULE;
1315         }
1316
1317         /* 'DOS' [R/W] */
1318         entry =
1319             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1320                               acpi_device_dir(device));
1321         if (!entry)
1322                 return -ENODEV;
1323         else {
1324                 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1325                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1326                 entry->data = acpi_driver_data(device);
1327                 entry->owner = THIS_MODULE;
1328         }
1329
1330         return 0;
1331 }
1332
1333 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1334 {
1335         struct acpi_video_bus *video;
1336
1337
1338         video = acpi_driver_data(device);
1339
1340         if (acpi_device_dir(device)) {
1341                 remove_proc_entry("info", acpi_device_dir(device));
1342                 remove_proc_entry("ROM", acpi_device_dir(device));
1343                 remove_proc_entry("POST_info", acpi_device_dir(device));
1344                 remove_proc_entry("POST", acpi_device_dir(device));
1345                 remove_proc_entry("DOS", acpi_device_dir(device));
1346                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1347                 acpi_device_dir(device) = NULL;
1348         }
1349
1350         return 0;
1351 }
1352
1353 /* --------------------------------------------------------------------------
1354                                  Driver Interface
1355    -------------------------------------------------------------------------- */
1356
1357 /* device interface */
1358 static struct acpi_video_device_attrib*
1359 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1360 {
1361         int count;
1362
1363         for(count = 0; count < video->attached_count; count++)
1364                 if((video->attached_array[count].value.int_val & 0xffff) == device_id)
1365                         return &(video->attached_array[count].value.attrib);
1366         return NULL;
1367 }
1368
1369 static int
1370 acpi_video_bus_get_one_device(struct acpi_device *device,
1371                               struct acpi_video_bus *video)
1372 {
1373         unsigned long device_id;
1374         int status;
1375         struct acpi_video_device *data;
1376         struct acpi_video_device_attrib* attribute;
1377
1378         if (!device || !video)
1379                 return -EINVAL;
1380
1381         status =
1382             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1383         if (ACPI_SUCCESS(status)) {
1384
1385                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1386                 if (!data)
1387                         return -ENOMEM;
1388
1389                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1390                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1391                 acpi_driver_data(device) = data;
1392
1393                 data->device_id = device_id;
1394                 data->video = video;
1395                 data->dev = device;
1396
1397                 attribute = acpi_video_get_device_attr(video, device_id);
1398
1399                 if((attribute != NULL) && attribute->device_id_scheme) {
1400                         switch (attribute->display_type) {
1401                         case ACPI_VIDEO_DISPLAY_CRT:
1402                                 data->flags.crt = 1;
1403                                 break;
1404                         case ACPI_VIDEO_DISPLAY_TV:
1405                                 data->flags.tvout = 1;
1406                                 break;
1407                         case ACPI_VIDEO_DISPLAY_DVI:
1408                                 data->flags.dvi = 1;
1409                                 break;
1410                         case ACPI_VIDEO_DISPLAY_LCD:
1411                                 data->flags.lcd = 1;
1412                                 break;
1413                         default:
1414                                 data->flags.unknown = 1;
1415                                 break;
1416                         }
1417                         if(attribute->bios_can_detect)
1418                                 data->flags.bios = 1;
1419                 } else
1420                         data->flags.unknown = 1;
1421
1422                 acpi_video_device_bind(video, data);
1423                 acpi_video_device_find_cap(data);
1424
1425                 status = acpi_install_notify_handler(device->handle,
1426                                                      ACPI_DEVICE_NOTIFY,
1427                                                      acpi_video_device_notify,
1428                                                      data);
1429                 if (ACPI_FAILURE(status)) {
1430                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1431                                           "Error installing notify handler\n"));
1432                         if(data->brightness)
1433                                 kfree(data->brightness->levels);
1434                         kfree(data->brightness);
1435                         kfree(data);
1436                         return -ENODEV;
1437                 }
1438
1439                 down(&video->sem);
1440                 list_add_tail(&data->entry, &video->video_device_list);
1441                 up(&video->sem);
1442
1443                 acpi_video_device_add_fs(device);
1444
1445                 return 0;
1446         }
1447
1448         return -ENOENT;
1449 }
1450
1451 /*
1452  *  Arg:
1453  *      video   : video bus device
1454  *
1455  *  Return:
1456  *      none
1457  *
1458  *  Enumerate the video device list of the video bus,
1459  *  bind the ids with the corresponding video devices
1460  *  under the video bus.
1461  */
1462
1463 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1464 {
1465         struct list_head *node, *next;
1466         list_for_each_safe(node, next, &video->video_device_list) {
1467                 struct acpi_video_device *dev =
1468                     container_of(node, struct acpi_video_device, entry);
1469                 acpi_video_device_bind(video, dev);
1470         }
1471 }
1472
1473 /*
1474  *  Arg:
1475  *      video   : video bus device
1476  *      device  : video output device under the video
1477  *              bus
1478  *
1479  *  Return:
1480  *      none
1481  *
1482  *  Bind the ids with the corresponding video devices
1483  *  under the video bus.
1484  */
1485
1486 static void
1487 acpi_video_device_bind(struct acpi_video_bus *video,
1488                        struct acpi_video_device *device)
1489 {
1490         int i;
1491
1492 #define IDS_VAL(i) video->attached_array[i].value.int_val
1493 #define IDS_BIND(i) video->attached_array[i].bind_info
1494
1495         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1496              i < video->attached_count; i++) {
1497                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1498                         IDS_BIND(i) = device;
1499                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1500                 }
1501         }
1502 #undef IDS_VAL
1503 #undef IDS_BIND
1504 }
1505
1506 /*
1507  *  Arg:
1508  *      video   : video bus device
1509  *
1510  *  Return:
1511  *      < 0     : error
1512  *
1513  *  Call _DOD to enumerate all devices attached to display adapter
1514  *
1515  */
1516
1517 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1518 {
1519         int status;
1520         int count;
1521         int i;
1522         struct acpi_video_enumerated_device *active_device_list;
1523         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1524         union acpi_object *dod = NULL;
1525         union acpi_object *obj;
1526
1527         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1528         if (!ACPI_SUCCESS(status)) {
1529                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1530                 return status;
1531         }
1532
1533         dod = buffer.pointer;
1534         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1535                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1536                 status = -EFAULT;
1537                 goto out;
1538         }
1539
1540         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1541                           dod->package.count));
1542
1543         active_device_list = kmalloc((1 +
1544                                       dod->package.count) *
1545                                      sizeof(struct
1546                                             acpi_video_enumerated_device),
1547                                      GFP_KERNEL);
1548
1549         if (!active_device_list) {
1550                 status = -ENOMEM;
1551                 goto out;
1552         }
1553
1554         count = 0;
1555         for (i = 0; i < dod->package.count; i++) {
1556                 obj = &dod->package.elements[i];
1557
1558                 if (obj->type != ACPI_TYPE_INTEGER) {
1559                         printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1560                         active_device_list[i].value.int_val =
1561                             ACPI_VIDEO_HEAD_INVALID;
1562                 }
1563                 active_device_list[i].value.int_val = obj->integer.value;
1564                 active_device_list[i].bind_info = NULL;
1565                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1566                                   (int)obj->integer.value));
1567                 count++;
1568         }
1569         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1570
1571         kfree(video->attached_array);
1572
1573         video->attached_array = active_device_list;
1574         video->attached_count = count;
1575       out:
1576         kfree(buffer.pointer);
1577         return status;
1578 }
1579
1580 /*
1581  *  Arg:
1582  *      video   : video bus device
1583  *      event   : notify event
1584  *
1585  *  Return:
1586  *      < 0     : error
1587  *
1588  *      1. Find out the current active output device.
1589  *      2. Identify the next output device to switch to.
1590  *      3. call _DSS to do actual switch.
1591  */
1592
1593 static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
1594 {
1595         struct list_head *node, *next;
1596         struct acpi_video_device *dev = NULL;
1597         struct acpi_video_device *dev_next = NULL;
1598         struct acpi_video_device *dev_prev = NULL;
1599         unsigned long state;
1600         int status = 0;
1601
1602
1603         list_for_each_safe(node, next, &video->video_device_list) {
1604                 dev = container_of(node, struct acpi_video_device, entry);
1605                 status = acpi_video_device_get_state(dev, &state);
1606                 if (state & 0x2) {
1607                         dev_next =
1608                             container_of(node->next, struct acpi_video_device,
1609                                          entry);
1610                         dev_prev =
1611                             container_of(node->prev, struct acpi_video_device,
1612                                          entry);
1613                         goto out;
1614                 }
1615         }
1616         dev_next = container_of(node->next, struct acpi_video_device, entry);
1617         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1618       out:
1619         switch (event) {
1620         case ACPI_VIDEO_NOTIFY_CYCLE:
1621         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
1622                 acpi_video_device_set_state(dev, 0);
1623                 acpi_video_device_set_state(dev_next, 0x80000001);
1624                 break;
1625         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
1626                 acpi_video_device_set_state(dev, 0);
1627                 acpi_video_device_set_state(dev_prev, 0x80000001);
1628         default:
1629                 break;
1630         }
1631
1632         return status;
1633 }
1634
1635 static int
1636 acpi_video_get_next_level(struct acpi_video_device *device,
1637                           u32 level_current, u32 event)
1638 {
1639         int min, max, min_above, max_below, i, l, delta = 255;
1640         max = max_below = 0;
1641         min = min_above = 255;
1642         /* Find closest level to level_current */
1643         for (i = 0; i < device->brightness->count; i++) {
1644                 l = device->brightness->levels[i];
1645                 if (abs(l - level_current) < abs(delta)) {
1646                         delta = l - level_current;
1647                         if (!delta)
1648                                 break;
1649                 }
1650         }
1651         /* Ajust level_current to closest available level */
1652         level_current += delta;
1653         for (i = 0; i < device->brightness->count; i++) {
1654                 l = device->brightness->levels[i];
1655                 if (l < min)
1656                         min = l;
1657                 if (l > max)
1658                         max = l;
1659                 if (l < min_above && l > level_current)
1660                         min_above = l;
1661                 if (l > max_below && l < level_current)
1662                         max_below = l;
1663         }
1664
1665         switch (event) {
1666         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1667                 return (level_current < max) ? min_above : min;
1668         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1669                 return (level_current < max) ? min_above : max;
1670         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1671                 return (level_current > min) ? max_below : min;
1672         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1673         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1674                 return 0;
1675         default:
1676                 return level_current;
1677         }
1678 }
1679
1680 static void
1681 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1682 {
1683         unsigned long level_current, level_next;
1684         acpi_video_device_lcd_get_level_current(device, &level_current);
1685         level_next = acpi_video_get_next_level(device, level_current, event);
1686         acpi_video_device_lcd_set_level(device, level_next);
1687 }
1688
1689 static int
1690 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1691                            struct acpi_device *device)
1692 {
1693         int status = 0;
1694         struct list_head *node, *next;
1695
1696
1697         acpi_video_device_enumerate(video);
1698
1699         list_for_each_safe(node, next, &device->children) {
1700                 struct acpi_device *dev =
1701                     list_entry(node, struct acpi_device, node);
1702
1703                 if (!dev)
1704                         continue;
1705
1706                 status = acpi_video_bus_get_one_device(dev, video);
1707                 if (ACPI_FAILURE(status)) {
1708                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1709                         continue;
1710                 }
1711
1712         }
1713         return status;
1714 }
1715
1716 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1717 {
1718         acpi_status status;
1719         struct acpi_video_bus *video;
1720
1721
1722         if (!device || !device->video)
1723                 return -ENOENT;
1724
1725         video = device->video;
1726
1727         down(&video->sem);
1728         list_del(&device->entry);
1729         up(&video->sem);
1730         acpi_video_device_remove_fs(device->dev);
1731
1732         status = acpi_remove_notify_handler(device->dev->handle,
1733                                             ACPI_DEVICE_NOTIFY,
1734                                             acpi_video_device_notify);
1735         backlight_device_unregister(device->backlight);
1736         video_output_unregister(device->output_dev);
1737         return 0;
1738 }
1739
1740 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1741 {
1742         int status;
1743         struct list_head *node, *next;
1744
1745
1746         list_for_each_safe(node, next, &video->video_device_list) {
1747                 struct acpi_video_device *data =
1748                     list_entry(node, struct acpi_video_device, entry);
1749                 if (!data)
1750                         continue;
1751
1752                 status = acpi_video_bus_put_one_device(data);
1753                 if (ACPI_FAILURE(status))
1754                         printk(KERN_WARNING PREFIX
1755                                "hhuuhhuu bug in acpi video driver.\n");
1756
1757                 if (data->brightness)
1758                         kfree(data->brightness->levels);
1759                 kfree(data->brightness);
1760                 kfree(data);
1761         }
1762
1763         return 0;
1764 }
1765
1766 /* acpi_video interface */
1767
1768 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1769 {
1770         return acpi_video_bus_DOS(video, 0, 0);
1771 }
1772
1773 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1774 {
1775         return acpi_video_bus_DOS(video, 0, 1);
1776 }
1777
1778 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1779 {
1780         struct acpi_video_bus *video = data;
1781         struct acpi_device *device = NULL;
1782         struct input_dev *input;
1783         int keycode;
1784
1785
1786         printk("video bus notify\n");
1787
1788         if (!video)
1789                 return;
1790
1791         device = video->device;
1792         input = video->input;
1793
1794         switch (event) {
1795         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1796                                          * most likely via hotkey. */
1797                 acpi_bus_generate_proc_event(device, event, 0);
1798                 keycode = KEY_SWITCHVIDEOMODE;
1799                 break;
1800
1801         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1802                                          * connector. */
1803                 acpi_video_device_enumerate(video);
1804                 acpi_video_device_rebind(video);
1805                 acpi_video_switch_output(video, event);
1806                 acpi_bus_generate_proc_event(device, event, 0);
1807                 keycode = KEY_SWITCHVIDEOMODE;
1808                 break;
1809
1810         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1811                 acpi_video_switch_output(video, event);
1812                 acpi_bus_generate_proc_event(device, event, 0);
1813                 keycode = KEY_SWITCHVIDEOMODE;
1814                 break;
1815         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1816                 acpi_video_switch_output(video, event);
1817                 acpi_bus_generate_proc_event(device, event, 0);
1818                 keycode = KEY_VIDEO_NEXT;
1819                 break;
1820         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1821                 acpi_video_switch_output(video, event);
1822                 acpi_bus_generate_proc_event(device, event, 0);
1823                 keycode = KEY_VIDEO_PREV;
1824                 break;
1825
1826         default:
1827                 keycode = KEY_UNKNOWN;
1828                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1829                                   "Unsupported event [0x%x]\n", event));
1830                 break;
1831         }
1832
1833         input_report_key(input, keycode, 1);
1834         input_sync(input);
1835         input_report_key(input, keycode, 0);
1836         input_sync(input);
1837
1838         return;
1839 }
1840
1841 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1842 {
1843         struct acpi_video_device *video_device = data;
1844         struct acpi_device *device = NULL;
1845         struct acpi_video_bus *bus;
1846         struct input_dev *input;
1847         int keycode;
1848
1849         if (!video_device)
1850                 return;
1851
1852         device = video_device->dev;
1853         bus = video_device->video;
1854         input = bus->input;
1855
1856         switch (event) {
1857         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1858                 acpi_video_switch_brightness(video_device, event);
1859                 acpi_bus_generate_proc_event(device, event, 0);
1860                 keycode = KEY_BRIGHTNESS_CYCLE;
1861                 break;
1862         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1863                 acpi_video_switch_brightness(video_device, event);
1864                 acpi_bus_generate_proc_event(device, event, 0);
1865                 keycode = KEY_BRIGHTNESSUP;
1866                 break;
1867         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1868                 acpi_video_switch_brightness(video_device, event);
1869                 acpi_bus_generate_proc_event(device, event, 0);
1870                 keycode = KEY_BRIGHTNESSDOWN;
1871                 break;
1872         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1873                 acpi_video_switch_brightness(video_device, event);
1874                 acpi_bus_generate_proc_event(device, event, 0);
1875                 keycode = KEY_BRIGHTNESS_ZERO;
1876                 break;
1877         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1878                 acpi_video_switch_brightness(video_device, event);
1879                 acpi_bus_generate_proc_event(device, event, 0);
1880                 keycode = KEY_DISPLAY_OFF;
1881                 break;
1882         default:
1883                 keycode = KEY_UNKNOWN;
1884                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1885                                   "Unsupported event [0x%x]\n", event));
1886                 break;
1887         }
1888
1889         input_report_key(input, keycode, 1);
1890         input_sync(input);
1891         input_report_key(input, keycode, 0);
1892         input_sync(input);
1893
1894         return;
1895 }
1896
1897 static int instance;
1898 static int acpi_video_bus_add(struct acpi_device *device)
1899 {
1900         int result = 0;
1901         acpi_status status = 0;
1902         struct acpi_video_bus *video = NULL;
1903         struct input_dev *input;
1904
1905
1906         if (!device)
1907                 return -EINVAL;
1908
1909         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1910         if (!video)
1911                 return -ENOMEM;
1912
1913         /* a hack to fix the duplicate name "VID" problem on T61 */
1914         if (!strcmp(device->pnp.bus_id, "VID")) {
1915                 if (instance)
1916                         device->pnp.bus_id[3] = '0' + instance;
1917                 instance ++;
1918         }
1919
1920         video->device = device;
1921         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1922         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1923         acpi_driver_data(device) = video;
1924
1925         acpi_video_bus_find_cap(video);
1926         result = acpi_video_bus_check(video);
1927         if (result)
1928                 goto end;
1929
1930         result = acpi_video_bus_add_fs(device);
1931         if (result)
1932                 goto end;
1933
1934         init_MUTEX(&video->sem);
1935         INIT_LIST_HEAD(&video->video_device_list);
1936
1937         acpi_video_bus_get_devices(video, device);
1938         acpi_video_bus_start_devices(video);
1939
1940         status = acpi_install_notify_handler(device->handle,
1941                                              ACPI_DEVICE_NOTIFY,
1942                                              acpi_video_bus_notify, video);
1943         if (ACPI_FAILURE(status)) {
1944                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1945                                   "Error installing notify handler\n"));
1946                 acpi_video_bus_stop_devices(video);
1947                 acpi_video_bus_put_devices(video);
1948                 kfree(video->attached_array);
1949                 acpi_video_bus_remove_fs(device);
1950                 result = -ENODEV;
1951                 goto end;
1952         }
1953
1954
1955         video->input = input = input_allocate_device();
1956
1957         snprintf(video->phys, sizeof(video->phys),
1958                 "%s/video/input0", acpi_device_hid(video->device));
1959
1960         input->name = acpi_device_name(video->device);
1961         input->phys = video->phys;
1962         input->id.bustype = BUS_HOST;
1963         input->id.product = 0x06;
1964         input->evbit[0] = BIT(EV_KEY);
1965         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1966         set_bit(KEY_VIDEO_NEXT, input->keybit);
1967         set_bit(KEY_VIDEO_PREV, input->keybit);
1968         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1969         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1970         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1971         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1972         set_bit(KEY_DISPLAY_OFF, input->keybit);
1973         set_bit(KEY_UNKNOWN, input->keybit);
1974         result = input_register_device(input);
1975         if (result) {
1976                 acpi_remove_notify_handler(video->device->handle,
1977                                                 ACPI_DEVICE_NOTIFY,
1978                                                 acpi_video_bus_notify);
1979                 acpi_video_bus_stop_devices(video);
1980                 acpi_video_bus_put_devices(video);
1981                 kfree(video->attached_array);
1982                 acpi_video_bus_remove_fs(device);
1983                 goto end;
1984         }
1985
1986
1987         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1988                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1989                video->flags.multihead ? "yes" : "no",
1990                video->flags.rom ? "yes" : "no",
1991                video->flags.post ? "yes" : "no");
1992
1993       end:
1994         if (result)
1995                 kfree(video);
1996
1997         return result;
1998 }
1999
2000 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2001 {
2002         acpi_status status = 0;
2003         struct acpi_video_bus *video = NULL;
2004
2005
2006         if (!device || !acpi_driver_data(device))
2007                 return -EINVAL;
2008
2009         video = acpi_driver_data(device);
2010
2011         acpi_video_bus_stop_devices(video);
2012
2013         status = acpi_remove_notify_handler(video->device->handle,
2014                                             ACPI_DEVICE_NOTIFY,
2015                                             acpi_video_bus_notify);
2016
2017         acpi_video_bus_put_devices(video);
2018         acpi_video_bus_remove_fs(device);
2019
2020         input_unregister_device(video->input);
2021         kfree(video->attached_array);
2022         kfree(video);
2023
2024         return 0;
2025 }
2026
2027 static int __init acpi_video_init(void)
2028 {
2029         int result = 0;
2030
2031
2032         /*
2033            acpi_dbg_level = 0xFFFFFFFF;
2034            acpi_dbg_layer = 0x08000000;
2035          */
2036
2037         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2038         if (!acpi_video_dir)
2039                 return -ENODEV;
2040         acpi_video_dir->owner = THIS_MODULE;
2041
2042         result = acpi_bus_register_driver(&acpi_video_bus);
2043         if (result < 0) {
2044                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2045                 return -ENODEV;
2046         }
2047
2048         return 0;
2049 }
2050
2051 static void __exit acpi_video_exit(void)
2052 {
2053
2054         acpi_bus_unregister_driver(&acpi_video_bus);
2055
2056         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2057
2058         return;
2059 }
2060
2061 module_init(acpi_video_init);
2062 module_exit(acpi_video_exit);