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