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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/thermal.h>
  38 #include <linux/video_output.h>
  39 #include <asm/uaccess.h>
  40
  41 #include <acpi/acpi_bus.h>
  42 #include <acpi/acpi_drivers.h>
  43
  44 #define ACPI_VIDEO_COMPONENT            0x08000000
  45 #define ACPI_VIDEO_CLASS                "video"
  46 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  47 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  48 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  49 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  50 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  51 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  52 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  53
  54 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  55 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  56 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  57 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  58 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  59
  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 brightness_switch_enabled = 1;
  75 module_param(brightness_switch_enabled, bool, 0644);
  76
  77 static int acpi_video_bus_add(struct acpi_device *device);
  78 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  79 static int acpi_video_resume(struct acpi_device *device);
  80
  81 static const struct acpi_device_id video_device_ids[] = {
  82         {ACPI_VIDEO_HID, 0},
  83         {"", 0},
  84 };
  85 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  86
  87 static struct acpi_driver acpi_video_bus = {
  88         .name = "video",
  89         .class = ACPI_VIDEO_CLASS,
  90         .ids = video_device_ids,
  91         .ops = {
  92                 .add = acpi_video_bus_add,
  93                 .remove = acpi_video_bus_remove,
  94                 .resume = acpi_video_resume,
  95                 },
  96 };
  97
  98 struct acpi_video_bus_flags {
  99         u8 multihead:1;         /* can switch video heads */
 100         u8 rom:1;               /* can retrieve a video rom */
 101         u8 post:1;              /* can configure the head to */
 102         u8 reserved:5;
 103 };
 104
 105 struct acpi_video_bus_cap {
 106         u8 _DOS:1;              /*Enable/Disable output switching */
 107         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 108         u8 _ROM:1;              /*Get ROM Data */
 109         u8 _GPD:1;              /*Get POST Device */
 110         u8 _SPD:1;              /*Set POST Device */
 111         u8 _VPO:1;              /*Video POST Options */
 112         u8 reserved:2;
 113 };
 114
 115 struct acpi_video_device_attrib {
 116         u32 display_index:4;    /* A zero-based instance of the Display */
 117         u32 display_port_attachment:4;  /*This field differentiates the display type */
 118         u32 display_type:4;     /*Describe the specific type in use */
 119         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 120         u32 bios_can_detect:1;  /*BIOS can detect the device */
 121         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 122                                    the VGA device. */
 123         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 124         u32 reserved:10;        /*Must be 0 */
 125         u32 device_id_scheme:1; /*Device ID Scheme */
 126 };
 127
 128 struct acpi_video_enumerated_device {
 129         union {
 130                 u32 int_val;
 131                 struct acpi_video_device_attrib attrib;
 132         } value;
 133         struct acpi_video_device *bind_info;
 134 };
 135
 136 struct acpi_video_bus {
 137         struct acpi_device *device;
 138         u8 dos_setting;
 139         struct acpi_video_enumerated_device *attached_array;
 140         u8 attached_count;
 141         struct acpi_video_bus_cap cap;
 142         struct acpi_video_bus_flags flags;
 143         struct list_head video_device_list;
 144         struct mutex device_list_lock;  /* protects video_device_list */
 145         struct proc_dir_entry *dir;
 146         struct input_dev *input;
 147         char phys[32];  /* for input device */
 148 };
 149
 150 struct acpi_video_device_flags {
 151         u8 crt:1;
 152         u8 lcd:1;
 153         u8 tvout:1;
 154         u8 dvi:1;
 155         u8 bios:1;
 156         u8 unknown:1;
 157         u8 reserved:2;
 158 };
 159
 160 struct acpi_video_device_cap {
 161         u8 _ADR:1;              /*Return the unique ID */
 162         u8 _BCL:1;              /*Query list of brightness control levels supported */
 163         u8 _BCM:1;              /*Set the brightness level */
 164         u8 _BQC:1;              /* Get current brightness level */
 165         u8 _DDC:1;              /*Return the EDID for this device */
 166         u8 _DCS:1;              /*Return status of output device */
 167         u8 _DGS:1;              /*Query graphics state */
 168         u8 _DSS:1;              /*Device state set */
 169 };
 170
 171 struct acpi_video_device_brightness {
 172         int curr;
 173         int count;
 174         int *levels;
 175 };
 176
 177 struct acpi_video_device {
 178         unsigned long device_id;
 179         struct acpi_video_device_flags flags;
 180         struct acpi_video_device_cap cap;
 181         struct list_head entry;
 182         struct acpi_video_bus *video;
 183         struct acpi_device *dev;
 184         struct acpi_video_device_brightness *brightness;
 185         struct backlight_device *backlight;
 186         struct thermal_cooling_device *cdev;
 187         struct output_device *output_dev;
 188 };
 189
 190 /* bus */
 191 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 192 static struct file_operations acpi_video_bus_info_fops = {
 193         .owner = THIS_MODULE,
 194         .open = acpi_video_bus_info_open_fs,
 195         .read = seq_read,
 196         .llseek = seq_lseek,
 197         .release = single_release,
 198 };
 199
 200 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 201 static struct file_operations acpi_video_bus_ROM_fops = {
 202         .owner = THIS_MODULE,
 203         .open = acpi_video_bus_ROM_open_fs,
 204         .read = seq_read,
 205         .llseek = seq_lseek,
 206         .release = single_release,
 207 };
 208
 209 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 210                                             struct file *file);
 211 static struct file_operations acpi_video_bus_POST_info_fops = {
 212         .owner = THIS_MODULE,
 213         .open = acpi_video_bus_POST_info_open_fs,
 214         .read = seq_read,
 215         .llseek = seq_lseek,
 216         .release = single_release,
 217 };
 218
 219 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 220 static struct file_operations acpi_video_bus_POST_fops = {
 221         .owner = THIS_MODULE,
 222         .open = acpi_video_bus_POST_open_fs,
 223         .read = seq_read,
 224         .llseek = seq_lseek,
 225         .release = single_release,
 226 };
 227
 228 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 229 static struct file_operations acpi_video_bus_DOS_fops = {
 230         .owner = THIS_MODULE,
 231         .open = acpi_video_bus_DOS_open_fs,
 232         .read = seq_read,
 233         .llseek = seq_lseek,
 234         .release = single_release,
 235 };
 236
 237 /* device */
 238 static int acpi_video_device_info_open_fs(struct inode *inode,
 239                                           struct file *file);
 240 static struct file_operations acpi_video_device_info_fops = {
 241         .owner = THIS_MODULE,
 242         .open = acpi_video_device_info_open_fs,
 243         .read = seq_read,
 244         .llseek = seq_lseek,
 245         .release = single_release,
 246 };
 247
 248 static int acpi_video_device_state_open_fs(struct inode *inode,
 249                                            struct file *file);
 250 static struct file_operations acpi_video_device_state_fops = {
 251         .owner = THIS_MODULE,
 252         .open = acpi_video_device_state_open_fs,
 253         .read = seq_read,
 254         .llseek = seq_lseek,
 255         .release = single_release,
 256 };
 257
 258 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 259                                                 struct file *file);
 260 static struct file_operations acpi_video_device_brightness_fops = {
 261         .owner = THIS_MODULE,
 262         .open = acpi_video_device_brightness_open_fs,
 263         .read = seq_read,
 264         .llseek = seq_lseek,
 265         .release = single_release,
 266 };
 267
 268 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 269                                           struct file *file);
 270 static struct file_operations acpi_video_device_EDID_fops = {
 271         .owner = THIS_MODULE,
 272         .open = acpi_video_device_EDID_open_fs,
 273         .read = seq_read,
 274         .llseek = seq_lseek,
 275         .release = single_release,
 276 };
 277
 278 static char device_decode[][30] = {
 279         "motherboard VGA device",
 280         "PCI VGA device",
 281         "AGP VGA device",
 282         "UNKNOWN",
 283 };
 284
 285 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 286 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 287 static void acpi_video_device_bind(struct acpi_video_bus *video,
 288                                    struct acpi_video_device *device);
 289 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 290 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 291                         int level);
 292 static int acpi_video_device_lcd_get_level_current(
 293                         struct acpi_video_device *device,
 294                         unsigned long *level);
 295 static int acpi_video_get_next_level(struct acpi_video_device *device,
 296                                      u32 level_current, u32 event);
 297 static void acpi_video_switch_brightness(struct acpi_video_device *device,
 298                                          int event);
 299 static int acpi_video_device_get_state(struct acpi_video_device *device,
 300                             unsigned long *state);
 301 static int acpi_video_output_get(struct output_device *od);
 302 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 303
 304 /*backlight device sysfs support*/
 305 static int acpi_video_get_brightness(struct backlight_device *bd)
 306 {
 307         unsigned long cur_level;
 308         int i;
 309         struct acpi_video_device *vd =
 310                 (struct acpi_video_device *)bl_get_data(bd);
 311         acpi_video_device_lcd_get_level_current(vd, &cur_level);
 312         for (i = 2; i < vd->brightness->count; i++) {
 313                 if (vd->brightness->levels[i] == cur_level)
 314                         /* The first two entries are special - see page 575
 315                            of the ACPI spec 3.0 */
 316                         return i-2;
 317         }
 318         return 0;
 319 }
 320
 321 static int acpi_video_set_brightness(struct backlight_device *bd)
 322 {
 323         int request_level = bd->props.brightness+2;
 324         struct acpi_video_device *vd =
 325                 (struct acpi_video_device *)bl_get_data(bd);
 326         acpi_video_device_lcd_set_level(vd,
 327                                         vd->brightness->levels[request_level]);
 328         return 0;
 329 }
 330
 331 static struct backlight_ops acpi_backlight_ops = {
 332         .get_brightness = acpi_video_get_brightness,
 333         .update_status  = acpi_video_set_brightness,
 334 };
 335
 336 /*video output device sysfs support*/
 337 static int acpi_video_output_get(struct output_device *od)
 338 {
 339         unsigned long state;
 340         struct acpi_video_device *vd =
 341                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 342         acpi_video_device_get_state(vd, &state);
 343         return (int)state;
 344 }
 345
 346 static int acpi_video_output_set(struct output_device *od)
 347 {
 348         unsigned long state = od->request_state;
 349         struct acpi_video_device *vd=
 350                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 351         return acpi_video_device_set_state(vd, state);
 352 }
 353
 354 static struct output_properties acpi_output_properties = {
 355         .set_state = acpi_video_output_set,
 356         .get_status = acpi_video_output_get,
 357 };
 358
 359
 360 /* thermal cooling device callbacks */
 361 static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
 362 {
 363         struct acpi_device *device = cdev->devdata;
 364         struct acpi_video_device *video = acpi_driver_data(device);
 365
 366         return sprintf(buf, "%d\n", video->brightness->count - 3);
 367 }
 368
 369 static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
 370 {
 371         struct acpi_device *device = cdev->devdata;
 372         struct acpi_video_device *video = acpi_driver_data(device);
 373         unsigned long level;
 374         int state;
 375
 376         acpi_video_device_lcd_get_level_current(video, &level);
 377         for (state = 2; state < video->brightness->count; state++)
 378                 if (level == video->brightness->levels[state])
 379                         return sprintf(buf, "%d\n",
 380                                        video->brightness->count - state - 1);
 381
 382         return -EINVAL;
 383 }
 384
 385 static int
 386 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
 387 {
 388         struct acpi_device *device = cdev->devdata;
 389         struct acpi_video_device *video = acpi_driver_data(device);
 390         int level;
 391
 392         if ( state >= video->brightness->count - 2)
 393                 return -EINVAL;
 394
 395         state = video->brightness->count - state;
 396         level = video->brightness->levels[state -1];
 397         return acpi_video_device_lcd_set_level(video, level);
 398 }
 399
 400 static struct thermal_cooling_device_ops video_cooling_ops = {
 401         .get_max_state = video_get_max_state,
 402         .get_cur_state = video_get_cur_state,
 403         .set_cur_state = video_set_cur_state,
 404 };
 405
 406 /* --------------------------------------------------------------------------
 407                                Video Management
 408    -------------------------------------------------------------------------- */
 409
 410 /* device */
 411
 412 static int
 413 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
 414 {
 415         int status;
 416
 417         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 418
 419         return status;
 420 }
 421
 422 static int
 423 acpi_video_device_get_state(struct acpi_video_device *device,
 424                             unsigned long *state)
 425 {
 426         int status;
 427
 428         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 429
 430         return status;
 431 }
 432
 433 static int
 434 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 435 {
 436         int status;
 437         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 438         struct acpi_object_list args = { 1, &arg0 };
 439         unsigned long ret;
 440
 441
 442         arg0.integer.value = state;
 443         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 444
 445         return status;
 446 }
 447
 448 static int
 449 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 450                                    union acpi_object **levels)
 451 {
 452         int status;
 453         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 454         union acpi_object *obj;
 455
 456
 457         *levels = NULL;
 458
 459         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 460         if (!ACPI_SUCCESS(status))
 461                 return status;
 462         obj = (union acpi_object *)buffer.pointer;
 463         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 464                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 465                 status = -EFAULT;
 466                 goto err;
 467         }
 468
 469         *levels = obj;
 470
 471         return 0;
 472
 473       err:
 474         kfree(buffer.pointer);
 475
 476         return status;
 477 }
 478
 479 static int
 480 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 481 {
 482         int status = AE_OK;
 483         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 484         struct acpi_object_list args = { 1, &arg0 };
 485
 486
 487         arg0.integer.value = level;
 488
 489         if (device->cap._BCM)
 490                 status = acpi_evaluate_object(device->dev->handle, "_BCM",
 491                                               &args, NULL);
 492         device->brightness->curr = level;
 493         return status;
 494 }
 495
 496 static int
 497 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 498                                         unsigned long *level)
 499 {
 500         if (device->cap._BQC)
 501                 return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
 502                                              level);
 503         *level = device->brightness->curr;
 504         return AE_OK;
 505 }
 506
 507 static int
 508 acpi_video_device_EDID(struct acpi_video_device *device,
 509                        union acpi_object **edid, ssize_t length)
 510 {
 511         int status;
 512         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 513         union acpi_object *obj;
 514         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 515         struct acpi_object_list args = { 1, &arg0 };
 516
 517
 518         *edid = NULL;
 519
 520         if (!device)
 521                 return -ENODEV;
 522         if (length == 128)
 523                 arg0.integer.value = 1;
 524         else if (length == 256)
 525                 arg0.integer.value = 2;
 526         else
 527                 return -EINVAL;
 528
 529         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 530         if (ACPI_FAILURE(status))
 531                 return -ENODEV;
 532
 533         obj = buffer.pointer;
 534
 535         if (obj && obj->type == ACPI_TYPE_BUFFER)
 536                 *edid = obj;
 537         else {
 538                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 539                 status = -EFAULT;
 540                 kfree(obj);
 541         }
 542
 543         return status;
 544 }
 545
 546 /* bus */
 547
 548 static int
 549 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 550 {
 551         int status;
 552         unsigned long tmp;
 553         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 554         struct acpi_object_list args = { 1, &arg0 };
 555
 556
 557         arg0.integer.value = option;
 558
 559         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 560         if (ACPI_SUCCESS(status))
 561                 status = tmp ? (-EINVAL) : (AE_OK);
 562
 563         return status;
 564 }
 565
 566 static int
 567 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
 568 {
 569         int status;
 570
 571         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 572
 573         return status;
 574 }
 575
 576 static int
 577 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 578                             unsigned long *options)
 579 {
 580         int status;
 581
 582         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 583         *options &= 3;
 584
 585         return status;
 586 }
 587
 588 /*
 589  *  Arg:
 590  *      video           : video bus device pointer
 591  *      bios_flag       :
 592  *              0.      The system BIOS should NOT automatically switch(toggle)
 593  *                      the active display output.
 594  *              1.      The system BIOS should automatically switch (toggle) the
 595  *                      active display output. No switch event.
 596  *              2.      The _DGS value should be locked.
 597  *              3.      The system BIOS should not automatically switch (toggle) the
 598  *                      active display output, but instead generate the display switch
 599  *                      event notify code.
 600  *      lcd_flag        :
 601  *              0.      The system BIOS should automatically control the brightness level
 602  *                      of the LCD when the power changes from AC to DC
 603  *              1.      The system BIOS should NOT automatically control the brightness
 604  *                      level of the LCD when the power changes from AC to DC.
 605  * Return Value:
 606  *              -1      wrong arg.
 607  */
 608
 609 static int
 610 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 611 {
 612         acpi_integer status = 0;
 613         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 614         struct acpi_object_list args = { 1, &arg0 };
 615
 616
 617         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 618                 status = -1;
 619                 goto Failed;
 620         }
 621         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 622         video->dos_setting = arg0.integer.value;
 623         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 624
 625       Failed:
 626         return status;
 627 }
 628
 629 /*
 630  *  Arg:
 631  *      device  : video output device (LCD, CRT, ..)
 632  *
 633  *  Return Value:
 634  *      None
 635  *
 636  *  Find out all required AML methods defined under the output
 637  *  device.
 638  */
 639
 640 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 641 {
 642         acpi_handle h_dummy1;
 643         int i;
 644         u32 max_level = 0;
 645         union acpi_object *obj = NULL;
 646         struct acpi_video_device_brightness *br = NULL;
 647
 648
 649         memset(&device->cap, 0, sizeof(device->cap));
 650
 651         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 652                 device->cap._ADR = 1;
 653         }
 654         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 655                 device->cap._BCL = 1;
 656         }
 657         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 658                 device->cap._BCM = 1;
 659         }
 660         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 661                 device->cap._BQC = 1;
 662         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 663                 device->cap._DDC = 1;
 664         }
 665         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 666                 device->cap._DCS = 1;
 667         }
 668         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 669                 device->cap._DGS = 1;
 670         }
 671         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 672                 device->cap._DSS = 1;
 673         }
 674
 675         if (ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 676
 677                 if (obj->package.count >= 2) {
 678                         int count = 0;
 679                         union acpi_object *o;
 680
 681                         br = kzalloc(sizeof(*br), GFP_KERNEL);
 682                         if (!br) {
 683                                 printk(KERN_ERR "can't allocate memory\n");
 684                         } else {
 685                                 br->levels = kmalloc(obj->package.count *
 686                                                      sizeof *(br->levels), GFP_KERNEL);
 687                                 if (!br->levels)
 688                                         goto out;
 689
 690                                 for (i = 0; i < obj->package.count; i++) {
 691                                         o = (union acpi_object *)&obj->package.
 692                                             elements[i];
 693                                         if (o->type != ACPI_TYPE_INTEGER) {
 694                                                 printk(KERN_ERR PREFIX "Invalid data\n");
 695                                                 continue;
 696                                         }
 697                                         br->levels[count] = (u32) o->integer.value;
 698
 699                                         if (br->levels[count] > max_level)
 700                                                 max_level = br->levels[count];
 701                                         count++;
 702                                 }
 703                               out:
 704                                 if (count < 2) {
 705                                         kfree(br->levels);
 706                                         kfree(br);
 707                                 } else {
 708                                         br->count = count;
 709                                         device->brightness = br;
 710                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 711                                                           "found %d brightness levels\n",
 712                                                           count));
 713                                 }
 714                         }
 715                 }
 716
 717         } else {
 718                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available LCD brightness level\n"));
 719         }
 720
 721         kfree(obj);
 722
 723         if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
 724                 int result;
 725                 static int count = 0;
 726                 char *name;
 727                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 728                 if (!name)
 729                         return;
 730
 731                 sprintf(name, "acpi_video%d", count++);
 732                 device->backlight = backlight_device_register(name,
 733                         NULL, device, &acpi_backlight_ops);
 734                 device->backlight->props.max_brightness = device->brightness->count-3;
 735                 device->backlight->props.brightness = acpi_video_get_brightness(device->backlight);
 736                 backlight_update_status(device->backlight);
 737                 kfree(name);
 738
 739                 device->cdev = thermal_cooling_device_register("LCD",
 740                                         device->dev, &video_cooling_ops);
 741                 if (IS_ERR(device->cdev))
 742                         return;
 743
 744                 printk(KERN_INFO PREFIX
 745                         "%s is registered as cooling_device%d\n",
 746                         device->dev->dev.bus_id, device->cdev->id);
 747                 result = sysfs_create_link(&device->dev->dev.kobj,
 748                                 &device->cdev->device.kobj,
 749                                 "thermal_cooling");
 750                 if (result)
 751                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 752                 result = sysfs_create_link(&device->cdev->device.kobj,
 753                                 &device->dev->dev.kobj, "device");
 754                 if (result)
 755                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 756
 757         }
 758         if (device->cap._DCS && device->cap._DSS){
 759                 static int count = 0;
 760                 char *name;
 761                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 762                 if (!name)
 763                         return;
 764                 sprintf(name, "acpi_video%d", count++);
 765                 device->output_dev = video_output_register(name,
 766                                 NULL, device, &acpi_output_properties);
 767                 kfree(name);
 768         }
 769         return;
 770 }
 771
 772 /*
 773  *  Arg:
 774  *      device  : video output device (VGA)
 775  *
 776  *  Return Value:
 777  *      None
 778  *
 779  *  Find out all required AML methods defined under the video bus device.
 780  */
 781
 782 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 783 {
 784         acpi_handle h_dummy1;
 785
 786         memset(&video->cap, 0, sizeof(video->cap));
 787         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 788                 video->cap._DOS = 1;
 789         }
 790         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 791                 video->cap._DOD = 1;
 792         }
 793         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 794                 video->cap._ROM = 1;
 795         }
 796         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 797                 video->cap._GPD = 1;
 798         }
 799         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 800                 video->cap._SPD = 1;
 801         }
 802         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 803                 video->cap._VPO = 1;
 804         }
 805 }
 806
 807 /*
 808  * Check whether the video bus device has required AML method to
 809  * support the desired features
 810  */
 811
 812 static int acpi_video_bus_check(struct acpi_video_bus *video)
 813 {
 814         acpi_status status = -ENOENT;
 815
 816
 817         if (!video)
 818                 return -EINVAL;
 819
 820         /* Since there is no HID, CID and so on for VGA driver, we have
 821          * to check well known required nodes.
 822          */
 823
 824         /* Does this device support video switching? */
 825         if (video->cap._DOS) {
 826                 video->flags.multihead = 1;
 827                 status = 0;
 828         }
 829
 830         /* Does this device support retrieving a video ROM? */
 831         if (video->cap._ROM) {
 832                 video->flags.rom = 1;
 833                 status = 0;
 834         }
 835
 836         /* Does this device support configuring which video device to POST? */
 837         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 838                 video->flags.post = 1;
 839                 status = 0;
 840         }
 841
 842         return status;
 843 }
 844
 845 /* --------------------------------------------------------------------------
 846                               FS Interface (/proc)
 847    -------------------------------------------------------------------------- */
 848
 849 static struct proc_dir_entry *acpi_video_dir;
 850
 851 /* video devices */
 852
 853 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 854 {
 855         struct acpi_video_device *dev = seq->private;
 856
 857
 858         if (!dev)
 859                 goto end;
 860
 861         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 862         seq_printf(seq, "type:         ");
 863         if (dev->flags.crt)
 864                 seq_printf(seq, "CRT\n");
 865         else if (dev->flags.lcd)
 866                 seq_printf(seq, "LCD\n");
 867         else if (dev->flags.tvout)
 868                 seq_printf(seq, "TVOUT\n");
 869         else if (dev->flags.dvi)
 870                 seq_printf(seq, "DVI\n");
 871         else
 872                 seq_printf(seq, "UNKNOWN\n");
 873
 874         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 875
 876       end:
 877         return 0;
 878 }
 879
 880 static int
 881 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 882 {
 883         return single_open(file, acpi_video_device_info_seq_show,
 884                            PDE(inode)->data);
 885 }
 886
 887 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 888 {
 889         int status;
 890         struct acpi_video_device *dev = seq->private;
 891         unsigned long state;
 892
 893
 894         if (!dev)
 895                 goto end;
 896
 897         status = acpi_video_device_get_state(dev, &state);
 898         seq_printf(seq, "state:     ");
 899         if (ACPI_SUCCESS(status))
 900                 seq_printf(seq, "0x%02lx\n", state);
 901         else
 902                 seq_printf(seq, "<not supported>\n");
 903
 904         status = acpi_video_device_query(dev, &state);
 905         seq_printf(seq, "query:     ");
 906         if (ACPI_SUCCESS(status))
 907                 seq_printf(seq, "0x%02lx\n", state);
 908         else
 909                 seq_printf(seq, "<not supported>\n");
 910
 911       end:
 912         return 0;
 913 }
 914
 915 static int
 916 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 917 {
 918         return single_open(file, acpi_video_device_state_seq_show,
 919                            PDE(inode)->data);
 920 }
 921
 922 static ssize_t
 923 acpi_video_device_write_state(struct file *file,
 924                               const char __user * buffer,
 925                               size_t count, loff_t * data)
 926 {
 927         int status;
 928         struct seq_file *m = file->private_data;
 929         struct acpi_video_device *dev = m->private;
 930         char str[12] = { 0 };
 931         u32 state = 0;
 932
 933
 934         if (!dev || count + 1 > sizeof str)
 935                 return -EINVAL;
 936
 937         if (copy_from_user(str, buffer, count))
 938                 return -EFAULT;
 939
 940         str[count] = 0;
 941         state = simple_strtoul(str, NULL, 0);
 942         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
 943
 944         status = acpi_video_device_set_state(dev, state);
 945
 946         if (status)
 947                 return -EFAULT;
 948
 949         return count;
 950 }
 951
 952 static int
 953 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
 954 {
 955         struct acpi_video_device *dev = seq->private;
 956         int i;
 957
 958
 959         if (!dev || !dev->brightness) {
 960                 seq_printf(seq, "<not supported>\n");
 961                 return 0;
 962         }
 963
 964         seq_printf(seq, "levels: ");
 965         for (i = 0; i < dev->brightness->count; i++)
 966                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 967         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 968
 969         return 0;
 970 }
 971
 972 static int
 973 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
 974 {
 975         return single_open(file, acpi_video_device_brightness_seq_show,
 976                            PDE(inode)->data);
 977 }
 978
 979 static ssize_t
 980 acpi_video_device_write_brightness(struct file *file,
 981                                    const char __user * buffer,
 982                                    size_t count, loff_t * data)
 983 {
 984         struct seq_file *m = file->private_data;
 985         struct acpi_video_device *dev = m->private;
 986         char str[5] = { 0 };
 987         unsigned int level = 0;
 988         int i;
 989
 990
 991         if (!dev || !dev->brightness || count + 1 > sizeof str)
 992                 return -EINVAL;
 993
 994         if (copy_from_user(str, buffer, count))
 995                 return -EFAULT;
 996
 997         str[count] = 0;
 998         level = simple_strtoul(str, NULL, 0);
 999
1000         if (level > 100)
1001                 return -EFAULT;
1002
1003         /* validate through the list of available levels */
1004         for (i = 0; i < dev->brightness->count; i++)
1005                 if (level == dev->brightness->levels[i]) {
1006                         if (ACPI_SUCCESS
1007                             (acpi_video_device_lcd_set_level(dev, level)))
1008                                 dev->brightness->curr = level;
1009                         break;
1010                 }
1011
1012         return count;
1013 }
1014
1015 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1016 {
1017         struct acpi_video_device *dev = seq->private;
1018         int status;
1019         int i;
1020         union acpi_object *edid = NULL;
1021
1022
1023         if (!dev)
1024                 goto out;
1025
1026         status = acpi_video_device_EDID(dev, &edid, 128);
1027         if (ACPI_FAILURE(status)) {
1028                 status = acpi_video_device_EDID(dev, &edid, 256);
1029         }
1030
1031         if (ACPI_FAILURE(status)) {
1032                 goto out;
1033         }
1034
1035         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1036                 for (i = 0; i < edid->buffer.length; i++)
1037                         seq_putc(seq, edid->buffer.pointer[i]);
1038         }
1039
1040       out:
1041         if (!edid)
1042                 seq_printf(seq, "<not supported>\n");
1043         else
1044                 kfree(edid);
1045
1046         return 0;
1047 }
1048
1049 static int
1050 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1051 {
1052         return single_open(file, acpi_video_device_EDID_seq_show,
1053                            PDE(inode)->data);
1054 }
1055
1056 static int acpi_video_device_add_fs(struct acpi_device *device)
1057 {
1058         struct proc_dir_entry *entry, *device_dir;
1059         struct acpi_video_device *vid_dev;
1060
1061         vid_dev = acpi_driver_data(device);
1062         if (!vid_dev)
1063                 return -ENODEV;
1064
1065         device_dir = proc_mkdir(acpi_device_bid(device),
1066                                 vid_dev->video->dir);
1067         if (!device_dir)
1068                 return -ENOMEM;
1069
1070         device_dir->owner = THIS_MODULE;
1071
1072         /* 'info' [R] */
1073         entry = proc_create_data("info", S_IRUGO, device_dir,
1074                         &acpi_video_device_info_fops, acpi_driver_data(device));
1075         if (!entry)
1076                 goto err_remove_dir;
1077
1078         /* 'state' [R/W] */
1079         acpi_video_device_state_fops.write = acpi_video_device_write_state;
1080         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1081                                  device_dir,
1082                                  &acpi_video_device_state_fops,
1083                                  acpi_driver_data(device));
1084         if (!entry)
1085                 goto err_remove_info;
1086
1087         /* 'brightness' [R/W] */
1088         acpi_video_device_brightness_fops.write =
1089                 acpi_video_device_write_brightness;
1090         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1091                                  device_dir,
1092                                  &acpi_video_device_brightness_fops,
1093                                  acpi_driver_data(device));
1094         if (!entry)
1095                 goto err_remove_state;
1096
1097         /* 'EDID' [R] */
1098         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1099                                  &acpi_video_device_EDID_fops,
1100                                  acpi_driver_data(device));
1101         if (!entry)
1102                 goto err_remove_brightness;
1103
1104         acpi_device_dir(device) = device_dir;
1105
1106         return 0;
1107
1108  err_remove_brightness:
1109         remove_proc_entry("brightness", device_dir);
1110  err_remove_state:
1111         remove_proc_entry("state", device_dir);
1112  err_remove_info:
1113         remove_proc_entry("info", device_dir);
1114  err_remove_dir:
1115         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1116         return -ENOMEM;
1117 }
1118
1119 static int acpi_video_device_remove_fs(struct acpi_device *device)
1120 {
1121         struct acpi_video_device *vid_dev;
1122         struct proc_dir_entry *device_dir;
1123
1124         vid_dev = acpi_driver_data(device);
1125         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1126                 return -ENODEV;
1127
1128         device_dir = acpi_device_dir(device);
1129         if (device_dir) {
1130                 remove_proc_entry("info", device_dir);
1131                 remove_proc_entry("state", device_dir);
1132                 remove_proc_entry("brightness", device_dir);
1133                 remove_proc_entry("EDID", device_dir);
1134                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1135                 acpi_device_dir(device) = NULL;
1136         }
1137
1138         return 0;
1139 }
1140
1141 /* video bus */
1142 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1143 {
1144         struct acpi_video_bus *video = seq->private;
1145
1146
1147         if (!video)
1148                 goto end;
1149
1150         seq_printf(seq, "Switching heads:              %s\n",
1151                    video->flags.multihead ? "yes" : "no");
1152         seq_printf(seq, "Video ROM:                    %s\n",
1153                    video->flags.rom ? "yes" : "no");
1154         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1155                    video->flags.post ? "yes" : "no");
1156
1157       end:
1158         return 0;
1159 }
1160
1161 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1162 {
1163         return single_open(file, acpi_video_bus_info_seq_show,
1164                            PDE(inode)->data);
1165 }
1166
1167 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1168 {
1169         struct acpi_video_bus *video = seq->private;
1170
1171
1172         if (!video)
1173                 goto end;
1174
1175         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1176         seq_printf(seq, "<TODO>\n");
1177
1178       end:
1179         return 0;
1180 }
1181
1182 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1183 {
1184         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1185 }
1186
1187 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1188 {
1189         struct acpi_video_bus *video = seq->private;
1190         unsigned long options;
1191         int status;
1192
1193
1194         if (!video)
1195                 goto end;
1196
1197         status = acpi_video_bus_POST_options(video, &options);
1198         if (ACPI_SUCCESS(status)) {
1199                 if (!(options & 1)) {
1200                         printk(KERN_WARNING PREFIX
1201                                "The motherboard VGA device is not listed as a possible POST device.\n");
1202                         printk(KERN_WARNING PREFIX
1203                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1204                 }
1205                 printk("%lx\n", options);
1206                 seq_printf(seq, "can POST: <integrated video>");
1207                 if (options & 2)
1208                         seq_printf(seq, " <PCI video>");
1209                 if (options & 4)
1210                         seq_printf(seq, " <AGP video>");
1211                 seq_putc(seq, '\n');
1212         } else
1213                 seq_printf(seq, "<not supported>\n");
1214       end:
1215         return 0;
1216 }
1217
1218 static int
1219 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1220 {
1221         return single_open(file, acpi_video_bus_POST_info_seq_show,
1222                            PDE(inode)->data);
1223 }
1224
1225 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1226 {
1227         struct acpi_video_bus *video = seq->private;
1228         int status;
1229         unsigned long id;
1230
1231
1232         if (!video)
1233                 goto end;
1234
1235         status = acpi_video_bus_get_POST(video, &id);
1236         if (!ACPI_SUCCESS(status)) {
1237                 seq_printf(seq, "<not supported>\n");
1238                 goto end;
1239         }
1240         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1241
1242       end:
1243         return 0;
1244 }
1245
1246 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1247 {
1248         struct acpi_video_bus *video = seq->private;
1249
1250
1251         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1252
1253         return 0;
1254 }
1255
1256 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1257 {
1258         return single_open(file, acpi_video_bus_POST_seq_show,
1259                            PDE(inode)->data);
1260 }
1261
1262 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1263 {
1264         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1265 }
1266
1267 static ssize_t
1268 acpi_video_bus_write_POST(struct file *file,
1269                           const char __user * buffer,
1270                           size_t count, loff_t * data)
1271 {
1272         int status;
1273         struct seq_file *m = file->private_data;
1274         struct acpi_video_bus *video = m->private;
1275         char str[12] = { 0 };
1276         unsigned long opt, options;
1277
1278
1279         if (!video || count + 1 > sizeof str)
1280                 return -EINVAL;
1281
1282         status = acpi_video_bus_POST_options(video, &options);
1283         if (!ACPI_SUCCESS(status))
1284                 return -EINVAL;
1285
1286         if (copy_from_user(str, buffer, count))
1287                 return -EFAULT;
1288
1289         str[count] = 0;
1290         opt = strtoul(str, NULL, 0);
1291         if (opt > 3)
1292                 return -EFAULT;
1293
1294         /* just in case an OEM 'forgot' the motherboard... */
1295         options |= 1;
1296
1297         if (options & (1ul << opt)) {
1298                 status = acpi_video_bus_set_POST(video, opt);
1299                 if (!ACPI_SUCCESS(status))
1300                         return -EFAULT;
1301
1302         }
1303
1304         return count;
1305 }
1306
1307 static ssize_t
1308 acpi_video_bus_write_DOS(struct file *file,
1309                          const char __user * buffer,
1310                          size_t count, loff_t * data)
1311 {
1312         int status;
1313         struct seq_file *m = file->private_data;
1314         struct acpi_video_bus *video = m->private;
1315         char str[12] = { 0 };
1316         unsigned long opt;
1317
1318
1319         if (!video || count + 1 > sizeof str)
1320                 return -EINVAL;
1321
1322         if (copy_from_user(str, buffer, count))
1323                 return -EFAULT;
1324
1325         str[count] = 0;
1326         opt = strtoul(str, NULL, 0);
1327         if (opt > 7)
1328                 return -EFAULT;
1329
1330         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1331
1332         if (!ACPI_SUCCESS(status))
1333                 return -EFAULT;
1334
1335         return count;
1336 }
1337
1338 static int acpi_video_bus_add_fs(struct acpi_device *device)
1339 {
1340         struct acpi_video_bus *video = acpi_driver_data(device);
1341         struct proc_dir_entry *device_dir;
1342         struct proc_dir_entry *entry;
1343
1344         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1345         if (!device_dir)
1346                 return -ENOMEM;
1347
1348         device_dir->owner = THIS_MODULE;
1349
1350         /* 'info' [R] */
1351         entry = proc_create_data("info", S_IRUGO, device_dir,
1352                                  &acpi_video_bus_info_fops,
1353                                  acpi_driver_data(device));
1354         if (!entry)
1355                 goto err_remove_dir;
1356
1357         /* 'ROM' [R] */
1358         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1359                                  &acpi_video_bus_ROM_fops,
1360                                  acpi_driver_data(device));
1361         if (!entry)
1362                 goto err_remove_info;
1363
1364         /* 'POST_info' [R] */
1365         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1366                                  &acpi_video_bus_POST_info_fops,
1367                                  acpi_driver_data(device));
1368         if (!entry)
1369                 goto err_remove_rom;
1370
1371         /* 'POST' [R/W] */
1372         acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1373         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1374                                  device_dir,
1375                                  &acpi_video_bus_POST_fops,
1376                                  acpi_driver_data(device));
1377         if (!entry)
1378                 goto err_remove_post_info;
1379
1380         /* 'DOS' [R/W] */
1381         acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1382         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1383                                  device_dir,
1384                                  &acpi_video_bus_DOS_fops,
1385                                  acpi_driver_data(device));
1386         if (!entry)
1387                 goto err_remove_post;
1388
1389         video->dir = acpi_device_dir(device) = device_dir;
1390         return 0;
1391
1392  err_remove_post:
1393         remove_proc_entry("POST", device_dir);
1394  err_remove_post_info:
1395         remove_proc_entry("POST_info", device_dir);
1396  err_remove_rom:
1397         remove_proc_entry("ROM", device_dir);
1398  err_remove_info:
1399         remove_proc_entry("info", device_dir);
1400  err_remove_dir:
1401         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1402         return -ENOMEM;
1403 }
1404
1405 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1406 {
1407         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1408
1409         if (device_dir) {
1410                 remove_proc_entry("info", device_dir);
1411                 remove_proc_entry("ROM", device_dir);
1412                 remove_proc_entry("POST_info", device_dir);
1413                 remove_proc_entry("POST", device_dir);
1414                 remove_proc_entry("DOS", device_dir);
1415                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1416                 acpi_device_dir(device) = NULL;
1417         }
1418
1419         return 0;
1420 }
1421
1422 /* --------------------------------------------------------------------------
1423                                  Driver Interface
1424    -------------------------------------------------------------------------- */
1425
1426 /* device interface */
1427 static struct acpi_video_device_attrib*
1428 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1429 {
1430         struct acpi_video_enumerated_device *ids;
1431         int i;
1432
1433         for (i = 0; i < video->attached_count; i++) {
1434                 ids = &video->attached_array[i];
1435                 if ((ids->value.int_val & 0xffff) == device_id)
1436                         return &ids->value.attrib;
1437         }
1438
1439         return NULL;
1440 }
1441
1442 static int
1443 acpi_video_bus_get_one_device(struct acpi_device *device,
1444                               struct acpi_video_bus *video)
1445 {
1446         unsigned long device_id;
1447         int status;
1448         struct acpi_video_device *data;
1449         struct acpi_video_device_attrib* attribute;
1450
1451         if (!device || !video)
1452                 return -EINVAL;
1453
1454         status =
1455             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1456         if (ACPI_SUCCESS(status)) {
1457
1458                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1459                 if (!data)
1460                         return -ENOMEM;
1461
1462                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1463                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1464                 acpi_driver_data(device) = data;
1465
1466                 data->device_id = device_id;
1467                 data->video = video;
1468                 data->dev = device;
1469
1470                 attribute = acpi_video_get_device_attr(video, device_id);
1471
1472                 if((attribute != NULL) && attribute->device_id_scheme) {
1473                         switch (attribute->display_type) {
1474                         case ACPI_VIDEO_DISPLAY_CRT:
1475                                 data->flags.crt = 1;
1476                                 break;
1477                         case ACPI_VIDEO_DISPLAY_TV:
1478                                 data->flags.tvout = 1;
1479                                 break;
1480                         case ACPI_VIDEO_DISPLAY_DVI:
1481                                 data->flags.dvi = 1;
1482                                 break;
1483                         case ACPI_VIDEO_DISPLAY_LCD:
1484                                 data->flags.lcd = 1;
1485                                 break;
1486                         default:
1487                                 data->flags.unknown = 1;
1488                                 break;
1489                         }
1490                         if(attribute->bios_can_detect)
1491                                 data->flags.bios = 1;
1492                 } else
1493                         data->flags.unknown = 1;
1494
1495                 acpi_video_device_bind(video, data);
1496                 acpi_video_device_find_cap(data);
1497
1498                 status = acpi_install_notify_handler(device->handle,
1499                                                      ACPI_DEVICE_NOTIFY,
1500                                                      acpi_video_device_notify,
1501                                                      data);
1502                 if (ACPI_FAILURE(status)) {
1503                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1504                                           "Error installing notify handler\n"));
1505                         if(data->brightness)
1506                                 kfree(data->brightness->levels);
1507                         kfree(data->brightness);
1508                         kfree(data);
1509                         return -ENODEV;
1510                 }
1511
1512                 mutex_lock(&video->device_list_lock);
1513                 list_add_tail(&data->entry, &video->video_device_list);
1514                 mutex_unlock(&video->device_list_lock);
1515
1516                 acpi_video_device_add_fs(device);
1517
1518                 return 0;
1519         }
1520
1521         return -ENOENT;
1522 }
1523
1524 /*
1525  *  Arg:
1526  *      video   : video bus device
1527  *
1528  *  Return:
1529  *      none
1530  *
1531  *  Enumerate the video device list of the video bus,
1532  *  bind the ids with the corresponding video devices
1533  *  under the video bus.
1534  */
1535
1536 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1537 {
1538         struct acpi_video_device *dev;
1539
1540         mutex_lock(&video->device_list_lock);
1541
1542         list_for_each_entry(dev, &video->video_device_list, entry)
1543                 acpi_video_device_bind(video, dev);
1544
1545         mutex_unlock(&video->device_list_lock);
1546 }
1547
1548 /*
1549  *  Arg:
1550  *      video   : video bus device
1551  *      device  : video output device under the video
1552  *              bus
1553  *
1554  *  Return:
1555  *      none
1556  *
1557  *  Bind the ids with the corresponding video devices
1558  *  under the video bus.
1559  */
1560
1561 static void
1562 acpi_video_device_bind(struct acpi_video_bus *video,
1563                        struct acpi_video_device *device)
1564 {
1565         struct acpi_video_enumerated_device *ids;
1566         int i;
1567
1568         for (i = 0; i < video->attached_count; i++) {
1569                 ids = &video->attached_array[i];
1570                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1571                         ids->bind_info = device;
1572                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1573                 }
1574         }
1575 }
1576
1577 /*
1578  *  Arg:
1579  *      video   : video bus device
1580  *
1581  *  Return:
1582  *      < 0     : error
1583  *
1584  *  Call _DOD to enumerate all devices attached to display adapter
1585  *
1586  */
1587
1588 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1589 {
1590         int status;
1591         int count;
1592         int i;
1593         struct acpi_video_enumerated_device *active_list;
1594         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1595         union acpi_object *dod = NULL;
1596         union acpi_object *obj;
1597
1598         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1599         if (!ACPI_SUCCESS(status)) {
1600                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1601                 return status;
1602         }
1603
1604         dod = buffer.pointer;
1605         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1606                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1607                 status = -EFAULT;
1608                 goto out;
1609         }
1610
1611         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1612                           dod->package.count));
1613
1614         active_list = kcalloc(1 + dod->package.count,
1615                               sizeof(struct acpi_video_enumerated_device),
1616                               GFP_KERNEL);
1617         if (!active_list) {
1618                 status = -ENOMEM;
1619                 goto out;
1620         }
1621
1622         count = 0;
1623         for (i = 0; i < dod->package.count; i++) {
1624                 obj = &dod->package.elements[i];
1625
1626                 if (obj->type != ACPI_TYPE_INTEGER) {
1627                         printk(KERN_ERR PREFIX
1628                                 "Invalid _DOD data in element %d\n", i);
1629                         continue;
1630                 }
1631
1632                 active_list[count].value.int_val = obj->integer.value;
1633                 active_list[count].bind_info = NULL;
1634                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1635                                   (int)obj->integer.value));
1636                 count++;
1637         }
1638
1639         kfree(video->attached_array);
1640
1641         video->attached_array = active_list;
1642         video->attached_count = count;
1643
1644  out:
1645         kfree(buffer.pointer);
1646         return status;
1647 }
1648
1649 static int
1650 acpi_video_get_next_level(struct acpi_video_device *device,
1651                           u32 level_current, u32 event)
1652 {
1653         int min, max, min_above, max_below, i, l, delta = 255;
1654         max = max_below = 0;
1655         min = min_above = 255;
1656         /* Find closest level to level_current */
1657         for (i = 0; i < device->brightness->count; i++) {
1658                 l = device->brightness->levels[i];
1659                 if (abs(l - level_current) < abs(delta)) {
1660                         delta = l - level_current;
1661                         if (!delta)
1662                                 break;
1663                 }
1664         }
1665         /* Ajust level_current to closest available level */
1666         level_current += delta;
1667         for (i = 0; i < device->brightness->count; i++) {
1668                 l = device->brightness->levels[i];
1669                 if (l < min)
1670                         min = l;
1671                 if (l > max)
1672                         max = l;
1673                 if (l < min_above && l > level_current)
1674                         min_above = l;
1675                 if (l > max_below && l < level_current)
1676                         max_below = l;
1677         }
1678
1679         switch (event) {
1680         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1681                 return (level_current < max) ? min_above : min;
1682         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1683                 return (level_current < max) ? min_above : max;
1684         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1685                 return (level_current > min) ? max_below : min;
1686         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1687         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1688                 return 0;
1689         default:
1690                 return level_current;
1691         }
1692 }
1693
1694 static void
1695 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1696 {
1697         unsigned long level_current, level_next;
1698         acpi_video_device_lcd_get_level_current(device, &level_current);
1699         level_next = acpi_video_get_next_level(device, level_current, event);
1700         acpi_video_device_lcd_set_level(device, level_next);
1701 }
1702
1703 static int
1704 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1705                            struct acpi_device *device)
1706 {
1707         int status = 0;
1708         struct acpi_device *dev;
1709
1710         acpi_video_device_enumerate(video);
1711
1712         list_for_each_entry(dev, &device->children, node) {
1713
1714                 status = acpi_video_bus_get_one_device(dev, video);
1715                 if (ACPI_FAILURE(status)) {
1716                         ACPI_DEBUG_PRINT((ACPI_DB_WARN,
1717                                         "Cant attach device"));
1718                         continue;
1719                 }
1720         }
1721         return status;
1722 }
1723
1724 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1725 {
1726         acpi_status status;
1727         struct acpi_video_bus *video;
1728
1729
1730         if (!device || !device->video)
1731                 return -ENOENT;
1732
1733         video = device->video;
1734
1735         acpi_video_device_remove_fs(device->dev);
1736
1737         status = acpi_remove_notify_handler(device->dev->handle,
1738                                             ACPI_DEVICE_NOTIFY,
1739                                             acpi_video_device_notify);
1740         backlight_device_unregister(device->backlight);
1741         if (device->cdev) {
1742                 sysfs_remove_link(&device->dev->dev.kobj,
1743                                   "thermal_cooling");
1744                 sysfs_remove_link(&device->cdev->device.kobj,
1745                                   "device");
1746                 thermal_cooling_device_unregister(device->cdev);
1747                 device->cdev = NULL;
1748         }
1749         video_output_unregister(device->output_dev);
1750
1751         return 0;
1752 }
1753
1754 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1755 {
1756         int status;
1757         struct acpi_video_device *dev, *next;
1758
1759         mutex_lock(&video->device_list_lock);
1760
1761         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1762
1763                 status = acpi_video_bus_put_one_device(dev);
1764                 if (ACPI_FAILURE(status))
1765                         printk(KERN_WARNING PREFIX
1766                                "hhuuhhuu bug in acpi video driver.\n");
1767
1768                 if (dev->brightness) {
1769                         kfree(dev->brightness->levels);
1770                         kfree(dev->brightness);
1771                 }
1772                 list_del(&dev->entry);
1773                 kfree(dev);
1774         }
1775
1776         mutex_unlock(&video->device_list_lock);
1777
1778         return 0;
1779 }
1780
1781 /* acpi_video interface */
1782
1783 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1784 {
1785         return acpi_video_bus_DOS(video, 0, 0);
1786 }
1787
1788 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1789 {
1790         return acpi_video_bus_DOS(video, 0, 1);
1791 }
1792
1793 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1794 {
1795         struct acpi_video_bus *video = data;
1796         struct acpi_device *device = NULL;
1797         struct input_dev *input;
1798         int keycode;
1799
1800         if (!video)
1801                 return;
1802
1803         device = video->device;
1804         input = video->input;
1805
1806         switch (event) {
1807         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1808                                          * most likely via hotkey. */
1809                 acpi_bus_generate_proc_event(device, event, 0);
1810                 keycode = KEY_SWITCHVIDEOMODE;
1811                 break;
1812
1813         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1814                                          * connector. */
1815                 acpi_video_device_enumerate(video);
1816                 acpi_video_device_rebind(video);
1817                 acpi_bus_generate_proc_event(device, event, 0);
1818                 keycode = KEY_SWITCHVIDEOMODE;
1819                 break;
1820
1821         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1822                 acpi_bus_generate_proc_event(device, event, 0);
1823                 keycode = KEY_SWITCHVIDEOMODE;
1824                 break;
1825         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1826                 acpi_bus_generate_proc_event(device, event, 0);
1827                 keycode = KEY_VIDEO_NEXT;
1828                 break;
1829         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1830                 acpi_bus_generate_proc_event(device, event, 0);
1831                 keycode = KEY_VIDEO_PREV;
1832                 break;
1833
1834         default:
1835                 keycode = KEY_UNKNOWN;
1836                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1837                                   "Unsupported event [0x%x]\n", event));
1838                 break;
1839         }
1840
1841         acpi_notifier_call_chain(device, event, 0);
1842         input_report_key(input, keycode, 1);
1843         input_sync(input);
1844         input_report_key(input, keycode, 0);
1845         input_sync(input);
1846
1847         return;
1848 }
1849
1850 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1851 {
1852         struct acpi_video_device *video_device = data;
1853         struct acpi_device *device = NULL;
1854         struct acpi_video_bus *bus;
1855         struct input_dev *input;
1856         int keycode;
1857
1858         if (!video_device)
1859                 return;
1860
1861         device = video_device->dev;
1862         bus = video_device->video;
1863         input = bus->input;
1864
1865         switch (event) {
1866         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1867                 if (brightness_switch_enabled)
1868                         acpi_video_switch_brightness(video_device, event);
1869                 acpi_bus_generate_proc_event(device, event, 0);
1870                 keycode = KEY_BRIGHTNESS_CYCLE;
1871                 break;
1872         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1873                 if (brightness_switch_enabled)
1874                         acpi_video_switch_brightness(video_device, event);
1875                 acpi_bus_generate_proc_event(device, event, 0);
1876                 keycode = KEY_BRIGHTNESSUP;
1877                 break;
1878         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1879                 if (brightness_switch_enabled)
1880                         acpi_video_switch_brightness(video_device, event);
1881                 acpi_bus_generate_proc_event(device, event, 0);
1882                 keycode = KEY_BRIGHTNESSDOWN;
1883                 break;
1884         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1885                 if (brightness_switch_enabled)
1886                         acpi_video_switch_brightness(video_device, event);
1887                 acpi_bus_generate_proc_event(device, event, 0);
1888                 keycode = KEY_BRIGHTNESS_ZERO;
1889                 break;
1890         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1891                 if (brightness_switch_enabled)
1892                         acpi_video_switch_brightness(video_device, event);
1893                 acpi_bus_generate_proc_event(device, event, 0);
1894                 keycode = KEY_DISPLAY_OFF;
1895                 break;
1896         default:
1897                 keycode = KEY_UNKNOWN;
1898                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1899                                   "Unsupported event [0x%x]\n", event));
1900                 break;
1901         }
1902
1903         acpi_notifier_call_chain(device, event, 0);
1904         input_report_key(input, keycode, 1);
1905         input_sync(input);
1906         input_report_key(input, keycode, 0);
1907         input_sync(input);
1908
1909         return;
1910 }
1911
1912 static int instance;
1913 static int acpi_video_resume(struct acpi_device *device)
1914 {
1915         struct acpi_video_bus *video;
1916         struct acpi_video_device *video_device;
1917         int i;
1918
1919         if (!device || !acpi_driver_data(device))
1920                 return -EINVAL;
1921
1922         video = acpi_driver_data(device);
1923
1924         for (i = 0; i < video->attached_count; i++) {
1925                 video_device = video->attached_array[i].bind_info;
1926                 if (video_device && video_device->backlight)
1927                         acpi_video_set_brightness(video_device->backlight);
1928         }
1929         return AE_OK;
1930 }
1931
1932 static int acpi_video_bus_add(struct acpi_device *device)
1933 {
1934         acpi_status status;
1935         struct acpi_video_bus *video;
1936         struct input_dev *input;
1937         int error;
1938
1939         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1940         if (!video)
1941                 return -ENOMEM;
1942
1943         /* a hack to fix the duplicate name "VID" problem on T61 */
1944         if (!strcmp(device->pnp.bus_id, "VID")) {
1945                 if (instance)
1946                         device->pnp.bus_id[3] = '0' + instance;
1947                 instance ++;
1948         }
1949
1950         video->device = device;
1951         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1952         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1953         acpi_driver_data(device) = video;
1954
1955         acpi_video_bus_find_cap(video);
1956         error = acpi_video_bus_check(video);
1957         if (error)
1958                 goto err_free_video;
1959
1960         error = acpi_video_bus_add_fs(device);
1961         if (error)
1962                 goto err_free_video;
1963
1964         mutex_init(&video->device_list_lock);
1965         INIT_LIST_HEAD(&video->video_device_list);
1966
1967         acpi_video_bus_get_devices(video, device);
1968         acpi_video_bus_start_devices(video);
1969
1970         status = acpi_install_notify_handler(device->handle,
1971                                              ACPI_DEVICE_NOTIFY,
1972                                              acpi_video_bus_notify, video);
1973         if (ACPI_FAILURE(status)) {
1974                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1975                                   "Error installing notify handler\n"));
1976                 error = -ENODEV;
1977                 goto err_stop_video;
1978         }
1979
1980         video->input = input = input_allocate_device();
1981         if (!input) {
1982                 error = -ENOMEM;
1983                 goto err_uninstall_notify;
1984         }
1985
1986         snprintf(video->phys, sizeof(video->phys),
1987                 "%s/video/input0", acpi_device_hid(video->device));
1988
1989         input->name = acpi_device_name(video->device);
1990         input->phys = video->phys;
1991         input->id.bustype = BUS_HOST;
1992         input->id.product = 0x06;
1993         input->dev.parent = &device->dev;
1994         input->evbit[0] = BIT(EV_KEY);
1995         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1996         set_bit(KEY_VIDEO_NEXT, input->keybit);
1997         set_bit(KEY_VIDEO_PREV, input->keybit);
1998         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1999         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2000         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2001         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2002         set_bit(KEY_DISPLAY_OFF, input->keybit);
2003         set_bit(KEY_UNKNOWN, input->keybit);
2004
2005         error = input_register_device(input);
2006         if (error)
2007                 goto err_free_input_dev;
2008
2009         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2010                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2011                video->flags.multihead ? "yes" : "no",
2012                video->flags.rom ? "yes" : "no",
2013                video->flags.post ? "yes" : "no");
2014
2015         return 0;
2016
2017  err_free_input_dev:
2018         input_free_device(input);
2019  err_uninstall_notify:
2020         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2021                                    acpi_video_bus_notify);
2022  err_stop_video:
2023         acpi_video_bus_stop_devices(video);
2024         acpi_video_bus_put_devices(video);
2025         kfree(video->attached_array);
2026         acpi_video_bus_remove_fs(device);
2027  err_free_video:
2028         kfree(video);
2029         acpi_driver_data(device) = NULL;
2030
2031         return error;
2032 }
2033
2034 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2035 {
2036         acpi_status status = 0;
2037         struct acpi_video_bus *video = NULL;
2038
2039
2040         if (!device || !acpi_driver_data(device))
2041                 return -EINVAL;
2042
2043         video = acpi_driver_data(device);
2044
2045         acpi_video_bus_stop_devices(video);
2046
2047         status = acpi_remove_notify_handler(video->device->handle,
2048                                             ACPI_DEVICE_NOTIFY,
2049                                             acpi_video_bus_notify);
2050
2051         acpi_video_bus_put_devices(video);
2052         acpi_video_bus_remove_fs(device);
2053
2054         input_unregister_device(video->input);
2055         kfree(video->attached_array);
2056         kfree(video);
2057
2058         return 0;
2059 }
2060
2061 static int __init acpi_video_init(void)
2062 {
2063         int result = 0;
2064
2065
2066         /*
2067            acpi_dbg_level = 0xFFFFFFFF;
2068            acpi_dbg_layer = 0x08000000;
2069          */
2070
2071         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2072         if (!acpi_video_dir)
2073                 return -ENODEV;
2074         acpi_video_dir->owner = THIS_MODULE;
2075
2076         result = acpi_bus_register_driver(&acpi_video_bus);
2077         if (result < 0) {
2078                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2079                 return -ENODEV;
2080         }
2081
2082         return 0;
2083 }
2084
2085 static void __exit acpi_video_exit(void)
2086 {
2087
2088         acpi_bus_unregister_driver(&acpi_video_bus);
2089
2090         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2091
2092         return;
2093 }
2094
2095 module_init(acpi_video_init);
2096 module_exit(acpi_video_exit);