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