drivers/acpi/video.c

   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/list.h>
  32 #include <linux/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         .open = acpi_video_bus_info_open_fs,
 194         .read = seq_read,
 195         .llseek = seq_lseek,
 196         .release = single_release,
 197 };
 198
 199 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 200 static struct file_operations acpi_video_bus_ROM_fops = {
 201         .open = acpi_video_bus_ROM_open_fs,
 202         .read = seq_read,
 203         .llseek = seq_lseek,
 204         .release = single_release,
 205 };
 206
 207 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 208                                             struct file *file);
 209 static struct file_operations acpi_video_bus_POST_info_fops = {
 210         .open = acpi_video_bus_POST_info_open_fs,
 211         .read = seq_read,
 212         .llseek = seq_lseek,
 213         .release = single_release,
 214 };
 215
 216 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 217 static struct file_operations acpi_video_bus_POST_fops = {
 218         .open = acpi_video_bus_POST_open_fs,
 219         .read = seq_read,
 220         .llseek = seq_lseek,
 221         .release = single_release,
 222 };
 223
 224 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 225 static struct file_operations acpi_video_bus_DOS_fops = {
 226         .open = acpi_video_bus_DOS_open_fs,
 227         .read = seq_read,
 228         .llseek = seq_lseek,
 229         .release = single_release,
 230 };
 231
 232 /* device */
 233 static int acpi_video_device_info_open_fs(struct inode *inode,
 234                                           struct file *file);
 235 static struct file_operations acpi_video_device_info_fops = {
 236         .open = acpi_video_device_info_open_fs,
 237         .read = seq_read,
 238         .llseek = seq_lseek,
 239         .release = single_release,
 240 };
 241
 242 static int acpi_video_device_state_open_fs(struct inode *inode,
 243                                            struct file *file);
 244 static struct file_operations acpi_video_device_state_fops = {
 245         .open = acpi_video_device_state_open_fs,
 246         .read = seq_read,
 247         .llseek = seq_lseek,
 248         .release = single_release,
 249 };
 250
 251 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 252                                                 struct file *file);
 253 static struct file_operations acpi_video_device_brightness_fops = {
 254         .open = acpi_video_device_brightness_open_fs,
 255         .read = seq_read,
 256         .llseek = seq_lseek,
 257         .release = single_release,
 258 };
 259
 260 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 261                                           struct file *file);
 262 static struct file_operations acpi_video_device_EDID_fops = {
 263         .open = acpi_video_device_EDID_open_fs,
 264         .read = seq_read,
 265         .llseek = seq_lseek,
 266         .release = single_release,
 267 };
 268
 269 static char device_decode[][30] = {
 270         "motherboard VGA device",
 271         "PCI VGA device",
 272         "AGP VGA device",
 273         "UNKNOWN",
 274 };
 275
 276 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 277 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 278 static void acpi_video_device_bind(struct acpi_video_bus *video,
 279                                    struct acpi_video_device *device);
 280 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 281 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 282                         int level);
 283 static int acpi_video_device_lcd_get_level_current(
 284                         struct acpi_video_device *device,
 285                         unsigned long *level);
 286 static int acpi_video_get_next_level(struct acpi_video_device *device,
 287                                      u32 level_current, u32 event);
 288 static void acpi_video_switch_brightness(struct acpi_video_device *device,
 289                                          int event);
 290 static int acpi_video_device_get_state(struct acpi_video_device *device,
 291                             unsigned long *state);
 292 static int acpi_video_output_get(struct output_device *od);
 293 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 294
 295 /*backlight device sysfs support*/
 296 static int acpi_video_get_brightness(struct backlight_device *bd)
 297 {
 298         unsigned long cur_level;
 299         int i;
 300         struct acpi_video_device *vd =
 301                 (struct acpi_video_device *)bl_get_data(bd);
 302         acpi_video_device_lcd_get_level_current(vd, &cur_level);
 303         for (i = 2; i < vd->brightness->count; i++) {
 304                 if (vd->brightness->levels[i] == cur_level)
 305                         /* The first two entries are special - see page 575
 306                            of the ACPI spec 3.0 */
 307                         return i-2;
 308         }
 309         return 0;
 310 }
 311
 312 static int acpi_video_set_brightness(struct backlight_device *bd)
 313 {
 314         int request_level = bd->props.brightness+2;
 315         struct acpi_video_device *vd =
 316                 (struct acpi_video_device *)bl_get_data(bd);
 317         acpi_video_device_lcd_set_level(vd,
 318                                         vd->brightness->levels[request_level]);
 319         return 0;
 320 }
 321
 322 static struct backlight_ops acpi_backlight_ops = {
 323         .get_brightness = acpi_video_get_brightness,
 324         .update_status  = acpi_video_set_brightness,
 325 };
 326
 327 /*video output device sysfs support*/
 328 static int acpi_video_output_get(struct output_device *od)
 329 {
 330         unsigned long state;
 331         struct acpi_video_device *vd =
 332                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 333         acpi_video_device_get_state(vd, &state);
 334         return (int)state;
 335 }
 336
 337 static int acpi_video_output_set(struct output_device *od)
 338 {
 339         unsigned long state = od->request_state;
 340         struct acpi_video_device *vd=
 341                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 342         return acpi_video_device_set_state(vd, state);
 343 }
 344
 345 static struct output_properties acpi_output_properties = {
 346         .set_state = acpi_video_output_set,
 347         .get_status = acpi_video_output_get,
 348 };
 349
 350
 351 /* thermal cooling device callbacks */
 352 static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
 353 {
 354         struct acpi_device *device = cdev->devdata;
 355         struct acpi_video_device *video = acpi_driver_data(device);
 356
 357         return sprintf(buf, "%d\n", video->brightness->count - 3);
 358 }
 359
 360 static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
 361 {
 362         struct acpi_device *device = cdev->devdata;
 363         struct acpi_video_device *video = acpi_driver_data(device);
 364         unsigned long level;
 365         int state;
 366
 367         acpi_video_device_lcd_get_level_current(video, &level);
 368         for (state = 2; state < video->brightness->count; state++)
 369                 if (level == video->brightness->levels[state])
 370                         return sprintf(buf, "%d\n",
 371                                        video->brightness->count - state - 1);
 372
 373         return -EINVAL;
 374 }
 375
 376 static int
 377 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
 378 {
 379         struct acpi_device *device = cdev->devdata;
 380         struct acpi_video_device *video = acpi_driver_data(device);
 381         int level;
 382
 383         if ( state >= video->brightness->count - 2)
 384                 return -EINVAL;
 385
 386         state = video->brightness->count - state;
 387         level = video->brightness->levels[state -1];
 388         return acpi_video_device_lcd_set_level(video, level);
 389 }
 390
 391 static struct thermal_cooling_device_ops video_cooling_ops = {
 392         .get_max_state = video_get_max_state,
 393         .get_cur_state = video_get_cur_state,
 394         .set_cur_state = video_set_cur_state,
 395 };
 396
 397 /* --------------------------------------------------------------------------
 398                                Video Management
 399    -------------------------------------------------------------------------- */
 400
 401 /* device */
 402
 403 static int
 404 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
 405 {
 406         int status;
 407
 408         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 409
 410         return status;
 411 }
 412
 413 static int
 414 acpi_video_device_get_state(struct acpi_video_device *device,
 415                             unsigned long *state)
 416 {
 417         int status;
 418
 419         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 420
 421         return status;
 422 }
 423
 424 static int
 425 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 426 {
 427         int status;
 428         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 429         struct acpi_object_list args = { 1, &arg0 };
 430         unsigned long ret;
 431
 432
 433         arg0.integer.value = state;
 434         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 435
 436         return status;
 437 }
 438
 439 static int
 440 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 441                                    union acpi_object **levels)
 442 {
 443         int status;
 444         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 445         union acpi_object *obj;
 446
 447
 448         *levels = NULL;
 449
 450         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 451         if (!ACPI_SUCCESS(status))
 452                 return status;
 453         obj = (union acpi_object *)buffer.pointer;
 454         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 455                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 456                 status = -EFAULT;
 457                 goto err;
 458         }
 459
 460         *levels = obj;
 461
 462         return 0;
 463
 464       err:
 465         kfree(buffer.pointer);
 466
 467         return status;
 468 }
 469
 470 static int
 471 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 472 {
 473         int status = AE_OK;
 474         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 475         struct acpi_object_list args = { 1, &arg0 };
 476
 477
 478         arg0.integer.value = level;
 479
 480         if (device->cap._BCM)
 481                 status = acpi_evaluate_object(device->dev->handle, "_BCM",
 482                                               &args, NULL);
 483         device->brightness->curr = level;
 484         return status;
 485 }
 486
 487 static int
 488 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 489                                         unsigned long *level)
 490 {
 491         if (device->cap._BQC)
 492                 return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
 493                                              level);
 494         *level = device->brightness->curr;
 495         return AE_OK;
 496 }
 497
 498 static int
 499 acpi_video_device_EDID(struct acpi_video_device *device,
 500                        union acpi_object **edid, ssize_t length)
 501 {
 502         int status;
 503         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 504         union acpi_object *obj;
 505         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 506         struct acpi_object_list args = { 1, &arg0 };
 507
 508
 509         *edid = NULL;
 510
 511         if (!device)
 512                 return -ENODEV;
 513         if (length == 128)
 514                 arg0.integer.value = 1;
 515         else if (length == 256)
 516                 arg0.integer.value = 2;
 517         else
 518                 return -EINVAL;
 519
 520         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 521         if (ACPI_FAILURE(status))
 522                 return -ENODEV;
 523
 524         obj = buffer.pointer;
 525
 526         if (obj && obj->type == ACPI_TYPE_BUFFER)
 527                 *edid = obj;
 528         else {
 529                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 530                 status = -EFAULT;
 531                 kfree(obj);
 532         }
 533
 534         return status;
 535 }
 536
 537 /* bus */
 538
 539 static int
 540 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 541 {
 542         int status;
 543         unsigned long tmp;
 544         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 545         struct acpi_object_list args = { 1, &arg0 };
 546
 547
 548         arg0.integer.value = option;
 549
 550         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 551         if (ACPI_SUCCESS(status))
 552                 status = tmp ? (-EINVAL) : (AE_OK);
 553
 554         return status;
 555 }
 556
 557 static int
 558 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
 559 {
 560         int status;
 561
 562         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 563
 564         return status;
 565 }
 566
 567 static int
 568 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 569                             unsigned long *options)
 570 {
 571         int status;
 572
 573         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 574         *options &= 3;
 575
 576         return status;
 577 }
 578
 579 /*
 580  *  Arg:
 581  *      video           : video bus device pointer
 582  *      bios_flag       :
 583  *              0.      The system BIOS should NOT automatically switch(toggle)
 584  *                      the active display output.
 585  *              1.      The system BIOS should automatically switch (toggle) the
 586  *                      active display output. No switch event.
 587  *              2.      The _DGS value should be locked.
 588  *              3.      The system BIOS should not automatically switch (toggle) the
 589  *                      active display output, but instead generate the display switch
 590  *                      event notify code.
 591  *      lcd_flag        :
 592  *              0.      The system BIOS should automatically control the brightness level
 593  *                      of the LCD when the power changes from AC to DC
 594  *              1.      The system BIOS should NOT automatically control the brightness
 595  *                      level of the LCD when the power changes from AC to DC.
 596  * Return Value:
 597  *              -1      wrong arg.
 598  */
 599
 600 static int
 601 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 602 {
 603         acpi_integer status = 0;
 604         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 605         struct acpi_object_list args = { 1, &arg0 };
 606
 607
 608         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 609                 status = -1;
 610                 goto Failed;
 611         }
 612         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 613         video->dos_setting = arg0.integer.value;
 614         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 615
 616       Failed:
 617         return status;
 618 }
 619
 620 /*
 621  *  Arg:
 622  *      device  : video output device (LCD, CRT, ..)
 623  *
 624  *  Return Value:
 625  *      None
 626  *
 627  *  Find out all required AML methods defined under the output
 628  *  device.
 629  */
 630
 631 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 632 {
 633         acpi_handle h_dummy1;
 634         int i;
 635         u32 max_level = 0;
 636         union acpi_object *obj = NULL;
 637         struct acpi_video_device_brightness *br = NULL;
 638
 639
 640         memset(&device->cap, 0, sizeof(device->cap));
 641
 642         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 643                 device->cap._ADR = 1;
 644         }
 645         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 646                 device->cap._BCL = 1;
 647         }
 648         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 649                 device->cap._BCM = 1;
 650         }
 651         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 652                 device->cap._BQC = 1;
 653         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 654                 device->cap._DDC = 1;
 655         }
 656         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 657                 device->cap._DCS = 1;
 658         }
 659         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 660                 device->cap._DGS = 1;
 661         }
 662         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 663                 device->cap._DSS = 1;
 664         }
 665
 666         if (ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 667
 668                 if (obj->package.count >= 2) {
 669                         int count = 0;
 670                         union acpi_object *o;
 671
 672                         br = kzalloc(sizeof(*br), GFP_KERNEL);
 673                         if (!br) {
 674                                 printk(KERN_ERR "can't allocate memory\n");
 675                         } else {
 676                                 br->levels = kmalloc(obj->package.count *
 677                                                      sizeof *(br->levels), GFP_KERNEL);
 678                                 if (!br->levels)
 679                                         goto out;
 680
 681                                 for (i = 0; i < obj->package.count; i++) {
 682                                         o = (union acpi_object *)&obj->package.
 683                                             elements[i];
 684                                         if (o->type != ACPI_TYPE_INTEGER) {
 685                                                 printk(KERN_ERR PREFIX "Invalid data\n");
 686                                                 continue;
 687                                         }
 688                                         br->levels[count] = (u32) o->integer.value;
 689
 690                                         if (br->levels[count] > max_level)
 691                                                 max_level = br->levels[count];
 692                                         count++;
 693                                 }
 694                               out:
 695                                 if (count < 2) {
 696                                         kfree(br->levels);
 697                                         kfree(br);
 698                                 } else {
 699                                         br->count = count;
 700                                         device->brightness = br;
 701                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 702                                                           "found %d brightness levels\n",
 703                                                           count));
 704                                 }
 705                         }
 706                 }
 707
 708         } else {
 709                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available LCD brightness level\n"));
 710         }
 711
 712         kfree(obj);
 713
 714         if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
 715                 int result;
 716                 static int count = 0;
 717                 char *name;
 718                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 719                 if (!name)
 720                         return;
 721
 722                 sprintf(name, "acpi_video%d", count++);
 723                 device->backlight = backlight_device_register(name,
 724                         NULL, device, &acpi_backlight_ops);
 725                 device->backlight->props.max_brightness = device->brightness->count-3;
 726                 device->backlight->props.brightness = acpi_video_get_brightness(device->backlight);
 727                 backlight_update_status(device->backlight);
 728                 kfree(name);
 729
 730                 device->cdev = thermal_cooling_device_register("LCD",
 731                                         device->dev, &video_cooling_ops);
 732                 if (IS_ERR(device->cdev))
 733                         return;
 734
 735                 if (device->cdev) {
 736                         printk(KERN_INFO PREFIX
 737                                 "%s is registered as cooling_device%d\n",
 738                                 device->dev->dev.bus_id, device->cdev->id);
 739                         result = sysfs_create_link(&device->dev->dev.kobj,
 740                                           &device->cdev->device.kobj,
 741                                           "thermal_cooling");
 742                         if (result)
 743                                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 744                         result = sysfs_create_link(&device->cdev->device.kobj,
 745                                           &device->dev->dev.kobj,
 746                                           "device");
 747                         if (result)
 748                                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 749                 }
 750         }
 751         if (device->cap._DCS && device->cap._DSS){
 752                 static int count = 0;
 753                 char *name;
 754                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 755                 if (!name)
 756                         return;
 757                 sprintf(name, "acpi_video%d", count++);
 758                 device->output_dev = video_output_register(name,
 759                                 NULL, device, &acpi_output_properties);
 760                 kfree(name);
 761         }
 762         return;
 763 }
 764
 765 /*
 766  *  Arg:
 767  *      device  : video output device (VGA)
 768  *
 769  *  Return Value:
 770  *      None
 771  *
 772  *  Find out all required AML methods defined under the video bus device.
 773  */
 774
 775 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 776 {
 777         acpi_handle h_dummy1;
 778
 779         memset(&video->cap, 0, sizeof(video->cap));
 780         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 781                 video->cap._DOS = 1;
 782         }
 783         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 784                 video->cap._DOD = 1;
 785         }
 786         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 787                 video->cap._ROM = 1;
 788         }
 789         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 790                 video->cap._GPD = 1;
 791         }
 792         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 793                 video->cap._SPD = 1;
 794         }
 795         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 796                 video->cap._VPO = 1;
 797         }
 798 }
 799
 800 /*
 801  * Check whether the video bus device has required AML method to
 802  * support the desired features
 803  */
 804
 805 static int acpi_video_bus_check(struct acpi_video_bus *video)
 806 {
 807         acpi_status status = -ENOENT;
 808
 809
 810         if (!video)
 811                 return -EINVAL;
 812
 813         /* Since there is no HID, CID and so on for VGA driver, we have
 814          * to check well known required nodes.
 815          */
 816
 817         /* Does this device support video switching? */
 818         if (video->cap._DOS) {
 819                 video->flags.multihead = 1;
 820                 status = 0;
 821         }
 822
 823         /* Does this device support retrieving a video ROM? */
 824         if (video->cap._ROM) {
 825                 video->flags.rom = 1;
 826                 status = 0;
 827         }
 828
 829         /* Does this device support configuring which video device to POST? */
 830         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 831                 video->flags.post = 1;
 832                 status = 0;
 833         }
 834
 835         return status;
 836 }
 837
 838 /* --------------------------------------------------------------------------
 839                               FS Interface (/proc)
 840    -------------------------------------------------------------------------- */
 841
 842 static struct proc_dir_entry *acpi_video_dir;
 843
 844 /* video devices */
 845
 846 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 847 {
 848         struct acpi_video_device *dev = seq->private;
 849
 850
 851         if (!dev)
 852                 goto end;
 853
 854         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 855         seq_printf(seq, "type:         ");
 856         if (dev->flags.crt)
 857                 seq_printf(seq, "CRT\n");
 858         else if (dev->flags.lcd)
 859                 seq_printf(seq, "LCD\n");
 860         else if (dev->flags.tvout)
 861                 seq_printf(seq, "TVOUT\n");
 862         else if (dev->flags.dvi)
 863                 seq_printf(seq, "DVI\n");
 864         else
 865                 seq_printf(seq, "UNKNOWN\n");
 866
 867         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 868
 869       end:
 870         return 0;
 871 }
 872
 873 static int
 874 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 875 {
 876         return single_open(file, acpi_video_device_info_seq_show,
 877                            PDE(inode)->data);
 878 }
 879
 880 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 881 {
 882         int status;
 883         struct acpi_video_device *dev = seq->private;
 884         unsigned long state;
 885
 886
 887         if (!dev)
 888                 goto end;
 889
 890         status = acpi_video_device_get_state(dev, &state);
 891         seq_printf(seq, "state:     ");
 892         if (ACPI_SUCCESS(status))
 893                 seq_printf(seq, "0x%02lx\n", state);
 894         else
 895                 seq_printf(seq, "<not supported>\n");
 896
 897         status = acpi_video_device_query(dev, &state);
 898         seq_printf(seq, "query:     ");
 899         if (ACPI_SUCCESS(status))
 900                 seq_printf(seq, "0x%02lx\n", state);
 901         else
 902                 seq_printf(seq, "<not supported>\n");
 903
 904       end:
 905         return 0;
 906 }
 907
 908 static int
 909 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 910 {
 911         return single_open(file, acpi_video_device_state_seq_show,
 912                            PDE(inode)->data);
 913 }
 914
 915 static ssize_t
 916 acpi_video_device_write_state(struct file *file,
 917                               const char __user * buffer,
 918                               size_t count, loff_t * data)
 919 {
 920         int status;
 921         struct seq_file *m = file->private_data;
 922         struct acpi_video_device *dev = m->private;
 923         char str[12] = { 0 };
 924         u32 state = 0;
 925
 926
 927         if (!dev || count + 1 > sizeof str)
 928                 return -EINVAL;
 929
 930         if (copy_from_user(str, buffer, count))
 931                 return -EFAULT;
 932
 933         str[count] = 0;
 934         state = simple_strtoul(str, NULL, 0);
 935         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
 936
 937         status = acpi_video_device_set_state(dev, state);
 938
 939         if (status)
 940                 return -EFAULT;
 941
 942         return count;
 943 }
 944
 945 static int
 946 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
 947 {
 948         struct acpi_video_device *dev = seq->private;
 949         int i;
 950
 951
 952         if (!dev || !dev->brightness) {
 953                 seq_printf(seq, "<not supported>\n");
 954                 return 0;
 955         }
 956
 957         seq_printf(seq, "levels: ");
 958         for (i = 0; i < dev->brightness->count; i++)
 959                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 960         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 961
 962         return 0;
 963 }
 964
 965 static int
 966 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
 967 {
 968         return single_open(file, acpi_video_device_brightness_seq_show,
 969                            PDE(inode)->data);
 970 }
 971
 972 static ssize_t
 973 acpi_video_device_write_brightness(struct file *file,
 974                                    const char __user * buffer,
 975                                    size_t count, loff_t * data)
 976 {
 977         struct seq_file *m = file->private_data;
 978         struct acpi_video_device *dev = m->private;
 979         char str[5] = { 0 };
 980         unsigned int level = 0;
 981         int i;
 982
 983
 984         if (!dev || !dev->brightness || count + 1 > sizeof str)
 985                 return -EINVAL;
 986
 987         if (copy_from_user(str, buffer, count))
 988                 return -EFAULT;
 989
 990         str[count] = 0;
 991         level = simple_strtoul(str, NULL, 0);
 992
 993         if (level > 100)
 994                 return -EFAULT;
 995
 996         /* validate through the list of available levels */
 997         for (i = 0; i < dev->brightness->count; i++)
 998                 if (level == dev->brightness->levels[i]) {
 999                         if (ACPI_SUCCESS
1000                             (acpi_video_device_lcd_set_level(dev, level)))
1001                                 dev->brightness->curr = level;
1002                         break;
1003                 }
1004
1005         return count;
1006 }
1007
1008 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1009 {
1010         struct acpi_video_device *dev = seq->private;
1011         int status;
1012         int i;
1013         union acpi_object *edid = NULL;
1014
1015
1016         if (!dev)
1017                 goto out;
1018
1019         status = acpi_video_device_EDID(dev, &edid, 128);
1020         if (ACPI_FAILURE(status)) {
1021                 status = acpi_video_device_EDID(dev, &edid, 256);
1022         }
1023
1024         if (ACPI_FAILURE(status)) {
1025                 goto out;
1026         }
1027
1028         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1029                 for (i = 0; i < edid->buffer.length; i++)
1030                         seq_putc(seq, edid->buffer.pointer[i]);
1031         }
1032
1033       out:
1034         if (!edid)
1035                 seq_printf(seq, "<not supported>\n");
1036         else
1037                 kfree(edid);
1038
1039         return 0;
1040 }
1041
1042 static int
1043 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1044 {
1045         return single_open(file, acpi_video_device_EDID_seq_show,
1046                            PDE(inode)->data);
1047 }
1048
1049 static int acpi_video_device_add_fs(struct acpi_device *device)
1050 {
1051         struct proc_dir_entry *entry, *device_dir;
1052         struct acpi_video_device *vid_dev;
1053
1054         vid_dev = acpi_driver_data(device);
1055         if (!vid_dev)
1056                 return -ENODEV;
1057
1058         device_dir = proc_mkdir(acpi_device_bid(device),
1059                                 vid_dev->video->dir);
1060         if (!device_dir)
1061                 return -ENOMEM;
1062
1063         device_dir->owner = THIS_MODULE;
1064
1065         /* 'info' [R] */
1066         entry = create_proc_entry("info", S_IRUGO, device_dir);
1067         if (!entry)
1068                 goto err_remove_dir;
1069
1070         entry->proc_fops = &acpi_video_device_info_fops;
1071         entry->data = acpi_driver_data(device);
1072         entry->owner = THIS_MODULE;
1073
1074         /* 'state' [R/W] */
1075         entry = create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
1076                                   device_dir);
1077         if (!entry)
1078                 goto err_remove_info;
1079
1080         acpi_video_device_state_fops.write = acpi_video_device_write_state;
1081         entry->proc_fops = &acpi_video_device_state_fops;
1082         entry->data = acpi_driver_data(device);
1083         entry->owner = THIS_MODULE;
1084
1085         /* 'brightness' [R/W] */
1086         entry = create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1087                                   device_dir);
1088         if (!entry)
1089                 goto err_remove_state;
1090
1091         acpi_video_device_brightness_fops.write =
1092                         acpi_video_device_write_brightness;
1093         entry->proc_fops = &acpi_video_device_brightness_fops;
1094         entry->data = acpi_driver_data(device);
1095         entry->owner = THIS_MODULE;
1096
1097         /* 'EDID' [R] */
1098         entry = create_proc_entry("EDID", S_IRUGO, device_dir);
1099         if (!entry)
1100                 goto err_remove_brightness;
1101
1102         entry->proc_fops = &acpi_video_device_EDID_fops;
1103         entry->data = acpi_driver_data(device);
1104         entry->owner = THIS_MODULE;
1105
1106         acpi_device_dir(device) = device_dir;
1107         return 0;
1108
1109  err_remove_brightness:
1110         remove_proc_entry("brightness", device_dir);
1111  err_remove_state:
1112         remove_proc_entry("state", device_dir);
1113  err_remove_info:
1114         remove_proc_entry("info", device_dir);
1115  err_remove_dir:
1116         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1117         return -ENOMEM;
1118 }
1119
1120 static int acpi_video_device_remove_fs(struct acpi_device *device)
1121 {
1122         struct acpi_video_device *vid_dev;
1123         struct proc_dir_entry *device_dir;
1124
1125         vid_dev = acpi_driver_data(device);
1126         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1127                 return -ENODEV;
1128
1129         device_dir = acpi_device_dir(device);
1130         if (device_dir) {
1131                 remove_proc_entry("info", device_dir);
1132                 remove_proc_entry("state", device_dir);
1133                 remove_proc_entry("brightness", device_dir);
1134                 remove_proc_entry("EDID", device_dir);
1135                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1136                 acpi_device_dir(device) = NULL;
1137         }
1138
1139         return 0;
1140 }
1141
1142 /* video bus */
1143 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1144 {
1145         struct acpi_video_bus *video = seq->private;
1146
1147
1148         if (!video)
1149                 goto end;
1150
1151         seq_printf(seq, "Switching heads:              %s\n",
1152                    video->flags.multihead ? "yes" : "no");
1153         seq_printf(seq, "Video ROM:                    %s\n",
1154                    video->flags.rom ? "yes" : "no");
1155         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1156                    video->flags.post ? "yes" : "no");
1157
1158       end:
1159         return 0;
1160 }
1161
1162 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1163 {
1164         return single_open(file, acpi_video_bus_info_seq_show,
1165                            PDE(inode)->data);
1166 }
1167
1168 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1169 {
1170         struct acpi_video_bus *video = seq->private;
1171
1172
1173         if (!video)
1174                 goto end;
1175
1176         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1177         seq_printf(seq, "<TODO>\n");
1178
1179       end:
1180         return 0;
1181 }
1182
1183 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1184 {
1185         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1186 }
1187
1188 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1189 {
1190         struct acpi_video_bus *video = seq->private;
1191         unsigned long options;
1192         int status;
1193
1194
1195         if (!video)
1196                 goto end;
1197
1198         status = acpi_video_bus_POST_options(video, &options);
1199         if (ACPI_SUCCESS(status)) {
1200                 if (!(options & 1)) {
1201                         printk(KERN_WARNING PREFIX
1202                                "The motherboard VGA device is not listed as a possible POST device.\n");
1203                         printk(KERN_WARNING PREFIX
1204                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1205                 }
1206                 printk("%lx\n", options);
1207                 seq_printf(seq, "can POST: <integrated video>");
1208                 if (options & 2)
1209                         seq_printf(seq, " <PCI video>");
1210                 if (options & 4)
1211                         seq_printf(seq, " <AGP video>");
1212                 seq_putc(seq, '\n');
1213         } else
1214                 seq_printf(seq, "<not supported>\n");
1215       end:
1216         return 0;
1217 }
1218
1219 static int
1220 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1221 {
1222         return single_open(file, acpi_video_bus_POST_info_seq_show,
1223                            PDE(inode)->data);
1224 }
1225
1226 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1227 {
1228         struct acpi_video_bus *video = seq->private;
1229         int status;
1230         unsigned long id;
1231
1232
1233         if (!video)
1234                 goto end;
1235
1236         status = acpi_video_bus_get_POST(video, &id);
1237         if (!ACPI_SUCCESS(status)) {
1238                 seq_printf(seq, "<not supported>\n");
1239                 goto end;
1240         }
1241         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1242
1243       end:
1244         return 0;
1245 }
1246
1247 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1248 {
1249         struct acpi_video_bus *video = seq->private;
1250
1251
1252         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1253
1254         return 0;
1255 }
1256
1257 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1258 {
1259         return single_open(file, acpi_video_bus_POST_seq_show,
1260                            PDE(inode)->data);
1261 }
1262
1263 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1264 {
1265         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1266 }
1267
1268 static ssize_t
1269 acpi_video_bus_write_POST(struct file *file,
1270                           const char __user * buffer,
1271                           size_t count, loff_t * data)
1272 {
1273         int status;
1274         struct seq_file *m = file->private_data;
1275         struct acpi_video_bus *video = m->private;
1276         char str[12] = { 0 };
1277         unsigned long opt, options;
1278
1279
1280         if (!video || count + 1 > sizeof str)
1281                 return -EINVAL;
1282
1283         status = acpi_video_bus_POST_options(video, &options);
1284         if (!ACPI_SUCCESS(status))
1285                 return -EINVAL;
1286
1287         if (copy_from_user(str, buffer, count))
1288                 return -EFAULT;
1289
1290         str[count] = 0;
1291         opt = strtoul(str, NULL, 0);
1292         if (opt > 3)
1293                 return -EFAULT;
1294
1295         /* just in case an OEM 'forgot' the motherboard... */
1296         options |= 1;
1297
1298         if (options & (1ul << opt)) {
1299                 status = acpi_video_bus_set_POST(video, opt);
1300                 if (!ACPI_SUCCESS(status))
1301                         return -EFAULT;
1302
1303         }
1304
1305         return count;
1306 }
1307
1308 static ssize_t
1309 acpi_video_bus_write_DOS(struct file *file,
1310                          const char __user * buffer,
1311                          size_t count, loff_t * data)
1312 {
1313         int status;
1314         struct seq_file *m = file->private_data;
1315         struct acpi_video_bus *video = m->private;
1316         char str[12] = { 0 };
1317         unsigned long opt;
1318
1319
1320         if (!video || count + 1 > sizeof str)
1321                 return -EINVAL;
1322
1323         if (copy_from_user(str, buffer, count))
1324                 return -EFAULT;
1325
1326         str[count] = 0;
1327         opt = strtoul(str, NULL, 0);
1328         if (opt > 7)
1329                 return -EFAULT;
1330
1331         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1332
1333         if (!ACPI_SUCCESS(status))
1334                 return -EFAULT;
1335
1336         return count;
1337 }
1338
1339 static int acpi_video_bus_add_fs(struct acpi_device *device)
1340 {
1341         struct acpi_video_bus *video = acpi_driver_data(device);
1342         struct proc_dir_entry *device_dir;
1343         struct proc_dir_entry *entry;
1344
1345         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1346         if (!device_dir)
1347                 return -ENOMEM;
1348
1349         device_dir->owner = THIS_MODULE;
1350
1351         /* 'info' [R] */
1352         entry = create_proc_entry("info", S_IRUGO, device_dir);
1353         if (!entry)
1354                 goto err_remove_dir;
1355
1356         entry->proc_fops = &acpi_video_bus_info_fops;
1357         entry->data = acpi_driver_data(device);
1358         entry->owner = THIS_MODULE;
1359
1360         /* 'ROM' [R] */
1361         entry = create_proc_entry("ROM", S_IRUGO, device_dir);
1362         if (!entry)
1363                 goto err_remove_info;
1364
1365         entry->proc_fops = &acpi_video_bus_ROM_fops;
1366         entry->data = acpi_driver_data(device);
1367         entry->owner = THIS_MODULE;
1368
1369         /* 'POST_info' [R] */
1370         entry = create_proc_entry("POST_info", S_IRUGO, device_dir);
1371         if (!entry)
1372                 goto err_remove_rom;
1373
1374         entry->proc_fops = &acpi_video_bus_POST_info_fops;
1375         entry->data = acpi_driver_data(device);
1376         entry->owner = THIS_MODULE;
1377
1378         /* 'POST' [R/W] */
1379         entry = create_proc_entry("POST", S_IFREG | S_IRUGO | S_IWUSR,
1380                                   device_dir);
1381         if (!entry)
1382                 goto err_remove_post_info;
1383
1384         acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1385         entry->proc_fops = &acpi_video_bus_POST_fops;
1386         entry->data = acpi_driver_data(device);
1387         entry->owner = THIS_MODULE;
1388
1389         /* 'DOS' [R/W] */
1390         entry = create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1391                               device_dir);
1392         if (!entry)
1393                 goto err_remove_post;
1394
1395         acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1396         entry->proc_fops = &acpi_video_bus_DOS_fops;
1397         entry->data = acpi_driver_data(device);
1398         entry->owner = THIS_MODULE;
1399
1400         video->dir = acpi_device_dir(device) = device_dir;
1401         return 0;
1402
1403  err_remove_post:
1404         remove_proc_entry("POST", device_dir);
1405  err_remove_post_info:
1406         remove_proc_entry("POST_info", device_dir);
1407  err_remove_rom:
1408         remove_proc_entry("ROM", device_dir);
1409  err_remove_info:
1410         remove_proc_entry("info", device_dir);
1411  err_remove_dir:
1412         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1413         return -ENOMEM;
1414 }
1415
1416 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1417 {
1418         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1419
1420         if (device_dir) {
1421                 remove_proc_entry("info", device_dir);
1422                 remove_proc_entry("ROM", device_dir);
1423                 remove_proc_entry("POST_info", device_dir);
1424                 remove_proc_entry("POST", device_dir);
1425                 remove_proc_entry("DOS", device_dir);
1426                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1427                 acpi_device_dir(device) = NULL;
1428         }
1429
1430         return 0;
1431 }
1432
1433 /* --------------------------------------------------------------------------
1434                                  Driver Interface
1435    -------------------------------------------------------------------------- */
1436
1437 /* device interface */
1438 static struct acpi_video_device_attrib*
1439 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1440 {
1441         struct acpi_video_enumerated_device *ids;
1442         int i;
1443
1444         for (i = 0; i < video->attached_count; i++) {
1445                 ids = &video->attached_array[i];
1446                 if ((ids->value.int_val & 0xffff) == device_id)
1447                         return &ids->value.attrib;
1448         }
1449
1450         return NULL;
1451 }
1452
1453 static int
1454 acpi_video_bus_get_one_device(struct acpi_device *device,
1455                               struct acpi_video_bus *video)
1456 {
1457         unsigned long device_id;
1458         int status;
1459         struct acpi_video_device *data;
1460         struct acpi_video_device_attrib* attribute;
1461
1462         if (!device || !video)
1463                 return -EINVAL;
1464
1465         status =
1466             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1467         if (ACPI_SUCCESS(status)) {
1468
1469                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1470                 if (!data)
1471                         return -ENOMEM;
1472
1473                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1474                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1475                 acpi_driver_data(device) = data;
1476
1477                 data->device_id = device_id;
1478                 data->video = video;
1479                 data->dev = device;
1480
1481                 attribute = acpi_video_get_device_attr(video, device_id);
1482
1483                 if((attribute != NULL) && attribute->device_id_scheme) {
1484                         switch (attribute->display_type) {
1485                         case ACPI_VIDEO_DISPLAY_CRT:
1486                                 data->flags.crt = 1;
1487                                 break;
1488                         case ACPI_VIDEO_DISPLAY_TV:
1489                                 data->flags.tvout = 1;
1490                                 break;
1491                         case ACPI_VIDEO_DISPLAY_DVI:
1492                                 data->flags.dvi = 1;
1493                                 break;
1494                         case ACPI_VIDEO_DISPLAY_LCD:
1495                                 data->flags.lcd = 1;
1496                                 break;
1497                         default:
1498                                 data->flags.unknown = 1;
1499                                 break;
1500                         }
1501                         if(attribute->bios_can_detect)
1502                                 data->flags.bios = 1;
1503                 } else
1504                         data->flags.unknown = 1;
1505
1506                 acpi_video_device_bind(video, data);
1507                 acpi_video_device_find_cap(data);
1508
1509                 status = acpi_install_notify_handler(device->handle,
1510                                                      ACPI_DEVICE_NOTIFY,
1511                                                      acpi_video_device_notify,
1512                                                      data);
1513                 if (ACPI_FAILURE(status)) {
1514                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1515                                           "Error installing notify handler\n"));
1516                         if(data->brightness)
1517                                 kfree(data->brightness->levels);
1518                         kfree(data->brightness);
1519                         kfree(data);
1520                         return -ENODEV;
1521                 }
1522
1523                 mutex_lock(&video->device_list_lock);
1524                 list_add_tail(&data->entry, &video->video_device_list);
1525                 mutex_unlock(&video->device_list_lock);
1526
1527                 acpi_video_device_add_fs(device);
1528
1529                 return 0;
1530         }
1531
1532         return -ENOENT;
1533 }
1534
1535 /*
1536  *  Arg:
1537  *      video   : video bus device
1538  *
1539  *  Return:
1540  *      none
1541  *
1542  *  Enumerate the video device list of the video bus,
1543  *  bind the ids with the corresponding video devices
1544  *  under the video bus.
1545  */
1546
1547 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1548 {
1549         struct acpi_video_device *dev;
1550
1551         mutex_lock(&video->device_list_lock);
1552
1553         list_for_each_entry(dev, &video->video_device_list, entry)
1554                 acpi_video_device_bind(video, dev);
1555
1556         mutex_unlock(&video->device_list_lock);
1557 }
1558
1559 /*
1560  *  Arg:
1561  *      video   : video bus device
1562  *      device  : video output device under the video
1563  *              bus
1564  *
1565  *  Return:
1566  *      none
1567  *
1568  *  Bind the ids with the corresponding video devices
1569  *  under the video bus.
1570  */
1571
1572 static void
1573 acpi_video_device_bind(struct acpi_video_bus *video,
1574                        struct acpi_video_device *device)
1575 {
1576         struct acpi_video_enumerated_device *ids;
1577         int i;
1578
1579         for (i = 0; i < video->attached_count; i++) {
1580                 ids = &video->attached_array[i];
1581                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1582                         ids->bind_info = device;
1583                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1584                 }
1585         }
1586 }
1587
1588 /*
1589  *  Arg:
1590  *      video   : video bus device
1591  *
1592  *  Return:
1593  *      < 0     : error
1594  *
1595  *  Call _DOD to enumerate all devices attached to display adapter
1596  *
1597  */
1598
1599 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1600 {
1601         int status;
1602         int count;
1603         int i;
1604         struct acpi_video_enumerated_device *active_list;
1605         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1606         union acpi_object *dod = NULL;
1607         union acpi_object *obj;
1608
1609         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1610         if (!ACPI_SUCCESS(status)) {
1611                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1612                 return status;
1613         }
1614
1615         dod = buffer.pointer;
1616         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1617                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1618                 status = -EFAULT;
1619                 goto out;
1620         }
1621
1622         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1623                           dod->package.count));
1624
1625         active_list = kcalloc(1 + dod->package.count,
1626                               sizeof(struct acpi_video_enumerated_device),
1627                               GFP_KERNEL);
1628         if (!active_list) {
1629                 status = -ENOMEM;
1630                 goto out;
1631         }
1632
1633         count = 0;
1634         for (i = 0; i < dod->package.count; i++) {
1635                 obj = &dod->package.elements[i];
1636
1637                 if (obj->type != ACPI_TYPE_INTEGER) {
1638                         printk(KERN_ERR PREFIX
1639                                 "Invalid _DOD data in element %d\n", i);
1640                         continue;
1641                 }
1642
1643                 active_list[count].value.int_val = obj->integer.value;
1644                 active_list[count].bind_info = NULL;
1645                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1646                                   (int)obj->integer.value));
1647                 count++;
1648         }
1649
1650         kfree(video->attached_array);
1651
1652         video->attached_array = active_list;
1653         video->attached_count = count;
1654
1655  out:
1656         kfree(buffer.pointer);
1657         return status;
1658 }
1659
1660 static int
1661 acpi_video_get_next_level(struct acpi_video_device *device,
1662                           u32 level_current, u32 event)
1663 {
1664         int min, max, min_above, max_below, i, l, delta = 255;
1665         max = max_below = 0;
1666         min = min_above = 255;
1667         /* Find closest level to level_current */
1668         for (i = 0; i < device->brightness->count; i++) {
1669                 l = device->brightness->levels[i];
1670                 if (abs(l - level_current) < abs(delta)) {
1671                         delta = l - level_current;
1672                         if (!delta)
1673                                 break;
1674                 }
1675         }
1676         /* Ajust level_current to closest available level */
1677         level_current += delta;
1678         for (i = 0; i < device->brightness->count; i++) {
1679                 l = device->brightness->levels[i];
1680                 if (l < min)
1681                         min = l;
1682                 if (l > max)
1683                         max = l;
1684                 if (l < min_above && l > level_current)
1685                         min_above = l;
1686                 if (l > max_below && l < level_current)
1687                         max_below = l;
1688         }
1689
1690         switch (event) {
1691         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1692                 return (level_current < max) ? min_above : min;
1693         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1694                 return (level_current < max) ? min_above : max;
1695         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1696                 return (level_current > min) ? max_below : min;
1697         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1698         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1699                 return 0;
1700         default:
1701                 return level_current;
1702         }
1703 }
1704
1705 static void
1706 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1707 {
1708         unsigned long level_current, level_next;
1709         acpi_video_device_lcd_get_level_current(device, &level_current);
1710         level_next = acpi_video_get_next_level(device, level_current, event);
1711         acpi_video_device_lcd_set_level(device, level_next);
1712 }
1713
1714 static int
1715 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1716                            struct acpi_device *device)
1717 {
1718         int status = 0;
1719         struct acpi_device *dev;
1720
1721         acpi_video_device_enumerate(video);
1722
1723         list_for_each_entry(dev, &device->children, node) {
1724
1725                 status = acpi_video_bus_get_one_device(dev, video);
1726                 if (ACPI_FAILURE(status)) {
1727                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1728                         continue;
1729                 }
1730         }
1731         return status;
1732 }
1733
1734 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1735 {
1736         acpi_status status;
1737         struct acpi_video_bus *video;
1738
1739
1740         if (!device || !device->video)
1741                 return -ENOENT;
1742
1743         video = device->video;
1744
1745         acpi_video_device_remove_fs(device->dev);
1746
1747         status = acpi_remove_notify_handler(device->dev->handle,
1748                                             ACPI_DEVICE_NOTIFY,
1749                                             acpi_video_device_notify);
1750         backlight_device_unregister(device->backlight);
1751         if (device->cdev) {
1752                 sysfs_remove_link(&device->dev->dev.kobj,
1753                                   "thermal_cooling");
1754                 sysfs_remove_link(&device->cdev->device.kobj,
1755                                   "device");
1756                 thermal_cooling_device_unregister(device->cdev);
1757                 device->cdev = NULL;
1758         }
1759         video_output_unregister(device->output_dev);
1760
1761         return 0;
1762 }
1763
1764 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1765 {
1766         int status;
1767         struct acpi_video_device *dev, *next;
1768
1769         mutex_lock(&video->device_list_lock);
1770
1771         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1772
1773                 status = acpi_video_bus_put_one_device(dev);
1774                 if (ACPI_FAILURE(status))
1775                         printk(KERN_WARNING PREFIX
1776                                "hhuuhhuu bug in acpi video driver.\n");
1777
1778                 if (dev->brightness) {
1779                         kfree(dev->brightness->levels);
1780                         kfree(dev->brightness);
1781                 }
1782                 list_del(&dev->entry);
1783                 kfree(dev);
1784         }
1785
1786         mutex_unlock(&video->device_list_lock);
1787
1788         return 0;
1789 }
1790
1791 /* acpi_video interface */
1792
1793 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1794 {
1795         return acpi_video_bus_DOS(video, 0, 0);
1796 }
1797
1798 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1799 {
1800         return acpi_video_bus_DOS(video, 0, 1);
1801 }
1802
1803 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1804 {
1805         struct acpi_video_bus *video = data;
1806         struct acpi_device *device = NULL;
1807         struct input_dev *input;
1808         int keycode;
1809
1810         if (!video)
1811                 return;
1812
1813         device = video->device;
1814         input = video->input;
1815
1816         switch (event) {
1817         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1818                                          * most likely via hotkey. */
1819                 acpi_bus_generate_proc_event(device, event, 0);
1820                 keycode = KEY_SWITCHVIDEOMODE;
1821                 break;
1822
1823         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1824                                          * connector. */
1825                 acpi_video_device_enumerate(video);
1826                 acpi_video_device_rebind(video);
1827                 acpi_bus_generate_proc_event(device, event, 0);
1828                 keycode = KEY_SWITCHVIDEOMODE;
1829                 break;
1830
1831         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1832                 acpi_bus_generate_proc_event(device, event, 0);
1833                 keycode = KEY_SWITCHVIDEOMODE;
1834                 break;
1835         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1836                 acpi_bus_generate_proc_event(device, event, 0);
1837                 keycode = KEY_VIDEO_NEXT;
1838                 break;
1839         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1840                 acpi_bus_generate_proc_event(device, event, 0);
1841                 keycode = KEY_VIDEO_PREV;
1842                 break;
1843
1844         default:
1845                 keycode = KEY_UNKNOWN;
1846                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1847                                   "Unsupported event [0x%x]\n", event));
1848                 break;
1849         }
1850
1851         acpi_notifier_call_chain(device, event, 0);
1852         input_report_key(input, keycode, 1);
1853         input_sync(input);
1854         input_report_key(input, keycode, 0);
1855         input_sync(input);
1856
1857         return;
1858 }
1859
1860 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1861 {
1862         struct acpi_video_device *video_device = data;
1863         struct acpi_device *device = NULL;
1864         struct acpi_video_bus *bus;
1865         struct input_dev *input;
1866         int keycode;
1867
1868         if (!video_device)
1869                 return;
1870
1871         device = video_device->dev;
1872         bus = video_device->video;
1873         input = bus->input;
1874
1875         switch (event) {
1876         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1877                 if (brightness_switch_enabled)
1878                         acpi_video_switch_brightness(video_device, event);
1879                 acpi_bus_generate_proc_event(device, event, 0);
1880                 keycode = KEY_BRIGHTNESS_CYCLE;
1881                 break;
1882         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1883                 if (brightness_switch_enabled)
1884                         acpi_video_switch_brightness(video_device, event);
1885                 acpi_bus_generate_proc_event(device, event, 0);
1886                 keycode = KEY_BRIGHTNESSUP;
1887                 break;
1888         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1889                 if (brightness_switch_enabled)
1890                         acpi_video_switch_brightness(video_device, event);
1891                 acpi_bus_generate_proc_event(device, event, 0);
1892                 keycode = KEY_BRIGHTNESSDOWN;
1893                 break;
1894         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1895                 if (brightness_switch_enabled)
1896                         acpi_video_switch_brightness(video_device, event);
1897                 acpi_bus_generate_proc_event(device, event, 0);
1898                 keycode = KEY_BRIGHTNESS_ZERO;
1899                 break;
1900         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1901                 if (brightness_switch_enabled)
1902                         acpi_video_switch_brightness(video_device, event);
1903                 acpi_bus_generate_proc_event(device, event, 0);
1904                 keycode = KEY_DISPLAY_OFF;
1905                 break;
1906         default:
1907                 keycode = KEY_UNKNOWN;
1908                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1909                                   "Unsupported event [0x%x]\n", event));
1910                 break;
1911         }
1912
1913         acpi_notifier_call_chain(device, event, 0);
1914         input_report_key(input, keycode, 1);
1915         input_sync(input);
1916         input_report_key(input, keycode, 0);
1917         input_sync(input);
1918
1919         return;
1920 }
1921
1922 static int instance;
1923 static int acpi_video_resume(struct acpi_device *device)
1924 {
1925         struct acpi_video_bus *video;
1926         struct acpi_video_device *video_device;
1927         int i;
1928
1929         if (!device || !acpi_driver_data(device))
1930                 return -EINVAL;
1931
1932         video = acpi_driver_data(device);
1933
1934         for (i = 0; i < video->attached_count; i++) {
1935                 video_device = video->attached_array[i].bind_info;
1936                 if (video_device && video_device->backlight)
1937                         acpi_video_set_brightness(video_device->backlight);
1938         }
1939         return AE_OK;
1940 }
1941
1942 static int acpi_video_bus_add(struct acpi_device *device)
1943 {
1944         acpi_status status;
1945         struct acpi_video_bus *video;
1946         struct input_dev *input;
1947         int error;
1948
1949         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1950         if (!video)
1951                 return -ENOMEM;
1952
1953         /* a hack to fix the duplicate name "VID" problem on T61 */
1954         if (!strcmp(device->pnp.bus_id, "VID")) {
1955                 if (instance)
1956                         device->pnp.bus_id[3] = '0' + instance;
1957                 instance ++;
1958         }
1959
1960         video->device = device;
1961         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1962         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1963         acpi_driver_data(device) = video;
1964
1965         acpi_video_bus_find_cap(video);
1966         error = acpi_video_bus_check(video);
1967         if (error)
1968                 goto err_free_video;
1969
1970         error = acpi_video_bus_add_fs(device);
1971         if (error)
1972                 goto err_free_video;
1973
1974         mutex_init(&video->device_list_lock);
1975         INIT_LIST_HEAD(&video->video_device_list);
1976
1977         acpi_video_bus_get_devices(video, device);
1978         acpi_video_bus_start_devices(video);
1979
1980         status = acpi_install_notify_handler(device->handle,
1981                                              ACPI_DEVICE_NOTIFY,
1982                                              acpi_video_bus_notify, video);
1983         if (ACPI_FAILURE(status)) {
1984                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1985                                   "Error installing notify handler\n"));
1986                 error = -ENODEV;
1987                 goto err_stop_video;
1988         }
1989
1990         video->input = input = input_allocate_device();
1991         if (!input) {
1992                 error = -ENOMEM;
1993                 goto err_uninstall_notify;
1994         }
1995
1996         snprintf(video->phys, sizeof(video->phys),
1997                 "%s/video/input0", acpi_device_hid(video->device));
1998
1999         input->name = acpi_device_name(video->device);
2000         input->phys = video->phys;
2001         input->id.bustype = BUS_HOST;
2002         input->id.product = 0x06;
2003         input->dev.parent = &device->dev;
2004         input->evbit[0] = BIT(EV_KEY);
2005         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2006         set_bit(KEY_VIDEO_NEXT, input->keybit);
2007         set_bit(KEY_VIDEO_PREV, input->keybit);
2008         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2009         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2010         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2011         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2012         set_bit(KEY_DISPLAY_OFF, input->keybit);
2013         set_bit(KEY_UNKNOWN, input->keybit);
2014
2015         error = input_register_device(input);
2016         if (error)
2017                 goto err_free_input_dev;
2018
2019         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2020                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2021                video->flags.multihead ? "yes" : "no",
2022                video->flags.rom ? "yes" : "no",
2023                video->flags.post ? "yes" : "no");
2024
2025         return 0;
2026
2027  err_free_input_dev:
2028         input_free_device(input);
2029  err_uninstall_notify:
2030         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2031                                    acpi_video_bus_notify);
2032  err_stop_video:
2033         acpi_video_bus_stop_devices(video);
2034         acpi_video_bus_put_devices(video);
2035         kfree(video->attached_array);
2036         acpi_video_bus_remove_fs(device);
2037  err_free_video:
2038         kfree(video);
2039         acpi_driver_data(device) = NULL;
2040
2041         return error;
2042 }
2043
2044 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2045 {
2046         acpi_status status = 0;
2047         struct acpi_video_bus *video = NULL;
2048
2049
2050         if (!device || !acpi_driver_data(device))
2051                 return -EINVAL;
2052
2053         video = acpi_driver_data(device);
2054
2055         acpi_video_bus_stop_devices(video);
2056
2057         status = acpi_remove_notify_handler(video->device->handle,
2058                                             ACPI_DEVICE_NOTIFY,
2059                                             acpi_video_bus_notify);
2060
2061         acpi_video_bus_put_devices(video);
2062         acpi_video_bus_remove_fs(device);
2063
2064         input_unregister_device(video->input);
2065         kfree(video->attached_array);
2066         kfree(video);
2067
2068         return 0;
2069 }
2070
2071 static int __init acpi_video_init(void)
2072 {
2073         int result = 0;
2074
2075
2076         /*
2077            acpi_dbg_level = 0xFFFFFFFF;
2078            acpi_dbg_layer = 0x08000000;
2079          */
2080
2081         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2082         if (!acpi_video_dir)
2083                 return -ENODEV;
2084         acpi_video_dir->owner = THIS_MODULE;
2085
2086         result = acpi_bus_register_driver(&acpi_video_bus);
2087         if (result < 0) {
2088                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2089                 return -ENODEV;
2090         }
2091
2092         return 0;
2093 }
2094
2095 static void __exit acpi_video_exit(void)
2096 {
2097
2098         acpi_bus_unregister_driver(&acpi_video_bus);
2099
2100         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2101
2102         return;
2103 }
2104
2105 module_init(acpi_video_init);
2106 module_exit(acpi_video_exit);