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 ACPI_VIDEO_HEAD_INVALID         (~0u - 1)
  61 #define ACPI_VIDEO_HEAD_END             (~0u)
  62 #define MAX_NAME_LEN    20
  63
  64 #define ACPI_VIDEO_DISPLAY_CRT  1
  65 #define ACPI_VIDEO_DISPLAY_TV   2
  66 #define ACPI_VIDEO_DISPLAY_DVI  3
  67 #define ACPI_VIDEO_DISPLAY_LCD  4
  68
  69 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  70 ACPI_MODULE_NAME("video");
  71
  72 MODULE_AUTHOR("Bruno Ducrot");
  73 MODULE_DESCRIPTION("ACPI Video Driver");
  74 MODULE_LICENSE("GPL");
  75
  76 static int brightness_switch_enabled = 1;
  77 module_param(brightness_switch_enabled, bool, 0644);
  78
  79 static int acpi_video_bus_add(struct acpi_device *device);
  80 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  81 static int acpi_video_resume(struct acpi_device *device);
  82
  83 static const struct acpi_device_id video_device_ids[] = {
  84         {ACPI_VIDEO_HID, 0},
  85         {"", 0},
  86 };
  87 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  88
  89 static struct acpi_driver acpi_video_bus = {
  90         .name = "video",
  91         .class = ACPI_VIDEO_CLASS,
  92         .ids = video_device_ids,
  93         .ops = {
  94                 .add = acpi_video_bus_add,
  95                 .remove = acpi_video_bus_remove,
  96                 .resume = acpi_video_resume,
  97                 },
  98 };
  99
 100 struct acpi_video_bus_flags {
 101         u8 multihead:1;         /* can switch video heads */
 102         u8 rom:1;               /* can retrieve a video rom */
 103         u8 post:1;              /* can configure the head to */
 104         u8 reserved:5;
 105 };
 106
 107 struct acpi_video_bus_cap {
 108         u8 _DOS:1;              /*Enable/Disable output switching */
 109         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 110         u8 _ROM:1;              /*Get ROM Data */
 111         u8 _GPD:1;              /*Get POST Device */
 112         u8 _SPD:1;              /*Set POST Device */
 113         u8 _VPO:1;              /*Video POST Options */
 114         u8 reserved:2;
 115 };
 116
 117 struct acpi_video_device_attrib {
 118         u32 display_index:4;    /* A zero-based instance of the Display */
 119         u32 display_port_attachment:4;  /*This field differentiates the display type */
 120         u32 display_type:4;     /*Describe the specific type in use */
 121         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 122         u32 bios_can_detect:1;  /*BIOS can detect the device */
 123         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 124                                    the VGA device. */
 125         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 126         u32 reserved:10;        /*Must be 0 */
 127         u32 device_id_scheme:1; /*Device ID Scheme */
 128 };
 129
 130 struct acpi_video_enumerated_device {
 131         union {
 132                 u32 int_val;
 133                 struct acpi_video_device_attrib attrib;
 134         } value;
 135         struct acpi_video_device *bind_info;
 136 };
 137
 138 struct acpi_video_bus {
 139         struct acpi_device *device;
 140         u8 dos_setting;
 141         struct acpi_video_enumerated_device *attached_array;
 142         u8 attached_count;
 143         struct acpi_video_bus_cap cap;
 144         struct acpi_video_bus_flags flags;
 145         struct list_head video_device_list;
 146         struct mutex device_list_lock;  /* protects video_device_list */
 147         struct proc_dir_entry *dir;
 148         struct input_dev *input;
 149         char phys[32];  /* for input device */
 150 };
 151
 152 struct acpi_video_device_flags {
 153         u8 crt:1;
 154         u8 lcd:1;
 155         u8 tvout:1;
 156         u8 dvi:1;
 157         u8 bios:1;
 158         u8 unknown:1;
 159         u8 reserved:2;
 160 };
 161
 162 struct acpi_video_device_cap {
 163         u8 _ADR:1;              /*Return the unique ID */
 164         u8 _BCL:1;              /*Query list of brightness control levels supported */
 165         u8 _BCM:1;              /*Set the brightness level */
 166         u8 _BQC:1;              /* Get current brightness level */
 167         u8 _DDC:1;              /*Return the EDID for this device */
 168         u8 _DCS:1;              /*Return status of output device */
 169         u8 _DGS:1;              /*Query graphics state */
 170         u8 _DSS:1;              /*Device state set */
 171 };
 172
 173 struct acpi_video_device_brightness {
 174         int curr;
 175         int count;
 176         int *levels;
 177 };
 178
 179 struct acpi_video_device {
 180         unsigned long device_id;
 181         struct acpi_video_device_flags flags;
 182         struct acpi_video_device_cap cap;
 183         struct list_head entry;
 184         struct acpi_video_bus *video;
 185         struct acpi_device *dev;
 186         struct acpi_video_device_brightness *brightness;
 187         struct backlight_device *backlight;
 188         struct thermal_cooling_device *cdev;
 189         struct output_device *output_dev;
 190 };
 191
 192 /* bus */
 193 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 194 static struct file_operations acpi_video_bus_info_fops = {
 195         .open = acpi_video_bus_info_open_fs,
 196         .read = seq_read,
 197         .llseek = seq_lseek,
 198         .release = single_release,
 199 };
 200
 201 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 202 static struct file_operations acpi_video_bus_ROM_fops = {
 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         .open = acpi_video_bus_POST_info_open_fs,
 213         .read = seq_read,
 214         .llseek = seq_lseek,
 215         .release = single_release,
 216 };
 217
 218 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 219 static struct file_operations acpi_video_bus_POST_fops = {
 220         .open = acpi_video_bus_POST_open_fs,
 221         .read = seq_read,
 222         .llseek = seq_lseek,
 223         .release = single_release,
 224 };
 225
 226 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 227 static struct file_operations acpi_video_bus_DOS_fops = {
 228         .open = acpi_video_bus_DOS_open_fs,
 229         .read = seq_read,
 230         .llseek = seq_lseek,
 231         .release = single_release,
 232 };
 233
 234 /* device */
 235 static int acpi_video_device_info_open_fs(struct inode *inode,
 236                                           struct file *file);
 237 static struct file_operations acpi_video_device_info_fops = {
 238         .open = acpi_video_device_info_open_fs,
 239         .read = seq_read,
 240         .llseek = seq_lseek,
 241         .release = single_release,
 242 };
 243
 244 static int acpi_video_device_state_open_fs(struct inode *inode,
 245                                            struct file *file);
 246 static struct file_operations acpi_video_device_state_fops = {
 247         .open = acpi_video_device_state_open_fs,
 248         .read = seq_read,
 249         .llseek = seq_lseek,
 250         .release = single_release,
 251 };
 252
 253 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 254                                                 struct file *file);
 255 static struct file_operations acpi_video_device_brightness_fops = {
 256         .open = acpi_video_device_brightness_open_fs,
 257         .read = seq_read,
 258         .llseek = seq_lseek,
 259         .release = single_release,
 260 };
 261
 262 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 263                                           struct file *file);
 264 static struct file_operations acpi_video_device_EDID_fops = {
 265         .open = acpi_video_device_EDID_open_fs,
 266         .read = seq_read,
 267         .llseek = seq_lseek,
 268         .release = single_release,
 269 };
 270
 271 static char device_decode[][30] = {
 272         "motherboard VGA device",
 273         "PCI VGA device",
 274         "AGP VGA device",
 275         "UNKNOWN",
 276 };
 277
 278 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 279 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 280 static void acpi_video_device_bind(struct acpi_video_bus *video,
 281                                    struct acpi_video_device *device);
 282 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 283 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 284                         int level);
 285 static int acpi_video_device_lcd_get_level_current(
 286                         struct acpi_video_device *device,
 287                         unsigned long *level);
 288 static int acpi_video_get_next_level(struct acpi_video_device *device,
 289                                      u32 level_current, u32 event);
 290 static void acpi_video_switch_brightness(struct acpi_video_device *device,
 291                                          int event);
 292 static int acpi_video_device_get_state(struct acpi_video_device *device,
 293                             unsigned long *state);
 294 static int acpi_video_output_get(struct output_device *od);
 295 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 296
 297 /*backlight device sysfs support*/
 298 static int acpi_video_get_brightness(struct backlight_device *bd)
 299 {
 300         unsigned long cur_level;
 301         int i;
 302         struct acpi_video_device *vd =
 303                 (struct acpi_video_device *)bl_get_data(bd);
 304         acpi_video_device_lcd_get_level_current(vd, &cur_level);
 305         for (i = 2; i < vd->brightness->count; i++) {
 306                 if (vd->brightness->levels[i] == cur_level)
 307                         /* The first two entries are special - see page 575
 308                            of the ACPI spec 3.0 */
 309                         return i-2;
 310         }
 311         return 0;
 312 }
 313
 314 static int acpi_video_set_brightness(struct backlight_device *bd)
 315 {
 316         int request_level = bd->props.brightness+2;
 317         struct acpi_video_device *vd =
 318                 (struct acpi_video_device *)bl_get_data(bd);
 319         acpi_video_device_lcd_set_level(vd,
 320                                         vd->brightness->levels[request_level]);
 321         return 0;
 322 }
 323
 324 static struct backlight_ops acpi_backlight_ops = {
 325         .get_brightness = acpi_video_get_brightness,
 326         .update_status  = acpi_video_set_brightness,
 327 };
 328
 329 /*video output device sysfs support*/
 330 static int acpi_video_output_get(struct output_device *od)
 331 {
 332         unsigned long state;
 333         struct acpi_video_device *vd =
 334                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 335         acpi_video_device_get_state(vd, &state);
 336         return (int)state;
 337 }
 338
 339 static int acpi_video_output_set(struct output_device *od)
 340 {
 341         unsigned long state = od->request_state;
 342         struct acpi_video_device *vd=
 343                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 344         return acpi_video_device_set_state(vd, state);
 345 }
 346
 347 static struct output_properties acpi_output_properties = {
 348         .set_state = acpi_video_output_set,
 349         .get_status = acpi_video_output_get,
 350 };
 351
 352
 353 /* thermal cooling device callbacks */
 354 static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
 355 {
 356         struct acpi_device *device = cdev->devdata;
 357         struct acpi_video_device *video = acpi_driver_data(device);
 358
 359         return sprintf(buf, "%d\n", video->brightness->count - 3);
 360 }
 361
 362 static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
 363 {
 364         struct acpi_device *device = cdev->devdata;
 365         struct acpi_video_device *video = acpi_driver_data(device);
 366         unsigned long level;
 367         int state;
 368
 369         acpi_video_device_lcd_get_level_current(video, &level);
 370         for (state = 2; state < video->brightness->count; state++)
 371                 if (level == video->brightness->levels[state])
 372                         return sprintf(buf, "%d\n",
 373                                        video->brightness->count - state - 1);
 374
 375         return -EINVAL;
 376 }
 377
 378 static int
 379 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
 380 {
 381         struct acpi_device *device = cdev->devdata;
 382         struct acpi_video_device *video = acpi_driver_data(device);
 383         int level;
 384
 385         if ( state >= video->brightness->count - 2)
 386                 return -EINVAL;
 387
 388         state = video->brightness->count - state;
 389         level = video->brightness->levels[state -1];
 390         return acpi_video_device_lcd_set_level(video, level);
 391 }
 392
 393 static struct thermal_cooling_device_ops video_cooling_ops = {
 394         .get_max_state = video_get_max_state,
 395         .get_cur_state = video_get_cur_state,
 396         .set_cur_state = video_set_cur_state,
 397 };
 398
 399 /* --------------------------------------------------------------------------
 400                                Video Management
 401    -------------------------------------------------------------------------- */
 402
 403 /* device */
 404
 405 static int
 406 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
 407 {
 408         int status;
 409
 410         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 411
 412         return status;
 413 }
 414
 415 static int
 416 acpi_video_device_get_state(struct acpi_video_device *device,
 417                             unsigned long *state)
 418 {
 419         int status;
 420
 421         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 422
 423         return status;
 424 }
 425
 426 static int
 427 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 428 {
 429         int status;
 430         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 431         struct acpi_object_list args = { 1, &arg0 };
 432         unsigned long ret;
 433
 434
 435         arg0.integer.value = state;
 436         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 437
 438         return status;
 439 }
 440
 441 static int
 442 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 443                                    union acpi_object **levels)
 444 {
 445         int status;
 446         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 447         union acpi_object *obj;
 448
 449
 450         *levels = NULL;
 451
 452         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 453         if (!ACPI_SUCCESS(status))
 454                 return status;
 455         obj = (union acpi_object *)buffer.pointer;
 456         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 457                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 458                 status = -EFAULT;
 459                 goto err;
 460         }
 461
 462         *levels = obj;
 463
 464         return 0;
 465
 466       err:
 467         kfree(buffer.pointer);
 468
 469         return status;
 470 }
 471
 472 static int
 473 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 474 {
 475         int status = AE_OK;
 476         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 477         struct acpi_object_list args = { 1, &arg0 };
 478
 479
 480         arg0.integer.value = level;
 481
 482         if (device->cap._BCM)
 483                 status = acpi_evaluate_object(device->dev->handle, "_BCM",
 484                                               &args, NULL);
 485         device->brightness->curr = level;
 486         return status;
 487 }
 488
 489 static int
 490 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 491                                         unsigned long *level)
 492 {
 493         if (device->cap._BQC)
 494                 return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
 495                                              level);
 496         *level = device->brightness->curr;
 497         return AE_OK;
 498 }
 499
 500 static int
 501 acpi_video_device_EDID(struct acpi_video_device *device,
 502                        union acpi_object **edid, ssize_t length)
 503 {
 504         int status;
 505         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 506         union acpi_object *obj;
 507         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 508         struct acpi_object_list args = { 1, &arg0 };
 509
 510
 511         *edid = NULL;
 512
 513         if (!device)
 514                 return -ENODEV;
 515         if (length == 128)
 516                 arg0.integer.value = 1;
 517         else if (length == 256)
 518                 arg0.integer.value = 2;
 519         else
 520                 return -EINVAL;
 521
 522         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 523         if (ACPI_FAILURE(status))
 524                 return -ENODEV;
 525
 526         obj = buffer.pointer;
 527
 528         if (obj && obj->type == ACPI_TYPE_BUFFER)
 529                 *edid = obj;
 530         else {
 531                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 532                 status = -EFAULT;
 533                 kfree(obj);
 534         }
 535
 536         return status;
 537 }
 538
 539 /* bus */
 540
 541 static int
 542 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 543 {
 544         int status;
 545         unsigned long tmp;
 546         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 547         struct acpi_object_list args = { 1, &arg0 };
 548
 549
 550         arg0.integer.value = option;
 551
 552         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 553         if (ACPI_SUCCESS(status))
 554                 status = tmp ? (-EINVAL) : (AE_OK);
 555
 556         return status;
 557 }
 558
 559 static int
 560 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
 561 {
 562         int status;
 563
 564         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 565
 566         return status;
 567 }
 568
 569 static int
 570 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 571                             unsigned long *options)
 572 {
 573         int status;
 574
 575         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 576         *options &= 3;
 577
 578         return status;
 579 }
 580
 581 /*
 582  *  Arg:
 583  *      video           : video bus device pointer
 584  *      bios_flag       :
 585  *              0.      The system BIOS should NOT automatically switch(toggle)
 586  *                      the active display output.
 587  *              1.      The system BIOS should automatically switch (toggle) the
 588  *                      active display output. No switch event.
 589  *              2.      The _DGS value should be locked.
 590  *              3.      The system BIOS should not automatically switch (toggle) the
 591  *                      active display output, but instead generate the display switch
 592  *                      event notify code.
 593  *      lcd_flag        :
 594  *              0.      The system BIOS should automatically control the brightness level
 595  *                      of the LCD when the power changes from AC to DC
 596  *              1.      The system BIOS should NOT automatically control the brightness
 597  *                      level of the LCD when the power changes from AC to DC.
 598  * Return Value:
 599  *              -1      wrong arg.
 600  */
 601
 602 static int
 603 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 604 {
 605         acpi_integer status = 0;
 606         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 607         struct acpi_object_list args = { 1, &arg0 };
 608
 609
 610         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 611                 status = -1;
 612                 goto Failed;
 613         }
 614         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 615         video->dos_setting = arg0.integer.value;
 616         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 617
 618       Failed:
 619         return status;
 620 }
 621
 622 /*
 623  *  Arg:
 624  *      device  : video output device (LCD, CRT, ..)
 625  *
 626  *  Return Value:
 627  *      None
 628  *
 629  *  Find out all required AML methods defined under the output
 630  *  device.
 631  */
 632
 633 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 634 {
 635         acpi_handle h_dummy1;
 636         int i;
 637         u32 max_level = 0;
 638         union acpi_object *obj = NULL;
 639         struct acpi_video_device_brightness *br = NULL;
 640
 641
 642         memset(&device->cap, 0, sizeof(device->cap));
 643
 644         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 645                 device->cap._ADR = 1;
 646         }
 647         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 648                 device->cap._BCL = 1;
 649         }
 650         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 651                 device->cap._BCM = 1;
 652         }
 653         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 654                 device->cap._BQC = 1;
 655         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 656                 device->cap._DDC = 1;
 657         }
 658         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 659                 device->cap._DCS = 1;
 660         }
 661         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 662                 device->cap._DGS = 1;
 663         }
 664         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 665                 device->cap._DSS = 1;
 666         }
 667
 668         if (ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 669
 670                 if (obj->package.count >= 2) {
 671                         int count = 0;
 672                         union acpi_object *o;
 673
 674                         br = kzalloc(sizeof(*br), GFP_KERNEL);
 675                         if (!br) {
 676                                 printk(KERN_ERR "can't allocate memory\n");
 677                         } else {
 678                                 br->levels = kmalloc(obj->package.count *
 679                                                      sizeof *(br->levels), GFP_KERNEL);
 680                                 if (!br->levels)
 681                                         goto out;
 682
 683                                 for (i = 0; i < obj->package.count; i++) {
 684                                         o = (union acpi_object *)&obj->package.
 685                                             elements[i];
 686                                         if (o->type != ACPI_TYPE_INTEGER) {
 687                                                 printk(KERN_ERR PREFIX "Invalid data\n");
 688                                                 continue;
 689                                         }
 690                                         br->levels[count] = (u32) o->integer.value;
 691
 692                                         if (br->levels[count] > max_level)
 693                                                 max_level = br->levels[count];
 694                                         count++;
 695                                 }
 696                               out:
 697                                 if (count < 2) {
 698                                         kfree(br->levels);
 699                                         kfree(br);
 700                                 } else {
 701                                         br->count = count;
 702                                         device->brightness = br;
 703                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 704                                                           "found %d brightness levels\n",
 705                                                           count));
 706                                 }
 707                         }
 708                 }
 709
 710         } else {
 711                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available LCD brightness level\n"));
 712         }
 713
 714         kfree(obj);
 715
 716         if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
 717                 int result;
 718                 static int count = 0;
 719                 char *name;
 720                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 721                 if (!name)
 722                         return;
 723
 724                 sprintf(name, "acpi_video%d", count++);
 725                 device->backlight = backlight_device_register(name,
 726                         NULL, device, &acpi_backlight_ops);
 727                 device->backlight->props.max_brightness = device->brightness->count-3;
 728                 device->backlight->props.brightness = acpi_video_get_brightness(device->backlight);
 729                 backlight_update_status(device->backlight);
 730                 kfree(name);
 731
 732                 device->cdev = thermal_cooling_device_register("LCD",
 733                                         device->dev, &video_cooling_ops);
 734                 if (IS_ERR(device->cdev))
 735                         return;
 736
 737                 if (device->cdev) {
 738                         printk(KERN_INFO PREFIX
 739                                 "%s is registered as cooling_device%d\n",
 740                                 device->dev->dev.bus_id, device->cdev->id);
 741                         result = sysfs_create_link(&device->dev->dev.kobj,
 742                                           &device->cdev->device.kobj,
 743                                           "thermal_cooling");
 744                         if (result)
 745                                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 746                         result = sysfs_create_link(&device->cdev->device.kobj,
 747                                           &device->dev->dev.kobj,
 748                                           "device");
 749                         if (result)
 750                                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 751                 }
 752         }
 753         if (device->cap._DCS && device->cap._DSS){
 754                 static int count = 0;
 755                 char *name;
 756                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 757                 if (!name)
 758                         return;
 759                 sprintf(name, "acpi_video%d", count++);
 760                 device->output_dev = video_output_register(name,
 761                                 NULL, device, &acpi_output_properties);
 762                 kfree(name);
 763         }
 764         return;
 765 }
 766
 767 /*
 768  *  Arg:
 769  *      device  : video output device (VGA)
 770  *
 771  *  Return Value:
 772  *      None
 773  *
 774  *  Find out all required AML methods defined under the video bus device.
 775  */
 776
 777 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 778 {
 779         acpi_handle h_dummy1;
 780
 781         memset(&video->cap, 0, sizeof(video->cap));
 782         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 783                 video->cap._DOS = 1;
 784         }
 785         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 786                 video->cap._DOD = 1;
 787         }
 788         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 789                 video->cap._ROM = 1;
 790         }
 791         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 792                 video->cap._GPD = 1;
 793         }
 794         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 795                 video->cap._SPD = 1;
 796         }
 797         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 798                 video->cap._VPO = 1;
 799         }
 800 }
 801
 802 /*
 803  * Check whether the video bus device has required AML method to
 804  * support the desired features
 805  */
 806
 807 static int acpi_video_bus_check(struct acpi_video_bus *video)
 808 {
 809         acpi_status status = -ENOENT;
 810         long device_id;
 811         struct device *dev;
 812         struct acpi_device *device;
 813
 814         if (!video)
 815                 return -EINVAL;
 816
 817         device = video->device;
 818
 819         status =
 820             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
 821
 822         if (!ACPI_SUCCESS(status))
 823                 return -ENODEV;
 824
 825         /* We need to attempt to determine whether the _ADR refers to a
 826            PCI device or not. There's no terribly good way to do this,
 827            so the best we can hope for is to assume that there'll never
 828            be a video device in the host bridge */
 829         if (device_id >= 0x10000) {
 830                 /* It looks like a PCI device. Does it exist? */
 831                 dev = acpi_get_physical_device(device->handle);
 832         } else {
 833                 /* It doesn't look like a PCI device. Does its parent
 834                    exist? */
 835                 acpi_handle phandle;
 836                 if (acpi_get_parent(device->handle, &phandle))
 837                         return -ENODEV;
 838                 dev = acpi_get_physical_device(phandle);
 839         }
 840         if (!dev)
 841                 return -ENODEV;
 842         put_device(dev);
 843
 844         /* Since there is no HID, CID and so on for VGA driver, we have
 845          * to check well known required nodes.
 846          */
 847
 848         /* Does this device support video switching? */
 849         if (video->cap._DOS) {
 850                 video->flags.multihead = 1;
 851                 status = 0;
 852         }
 853
 854         /* Does this device support retrieving a video ROM? */
 855         if (video->cap._ROM) {
 856                 video->flags.rom = 1;
 857                 status = 0;
 858         }
 859
 860         /* Does this device support configuring which video device to POST? */
 861         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 862                 video->flags.post = 1;
 863                 status = 0;
 864         }
 865
 866         return status;
 867 }
 868
 869 /* --------------------------------------------------------------------------
 870                               FS Interface (/proc)
 871    -------------------------------------------------------------------------- */
 872
 873 static struct proc_dir_entry *acpi_video_dir;
 874
 875 /* video devices */
 876
 877 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 878 {
 879         struct acpi_video_device *dev = seq->private;
 880
 881
 882         if (!dev)
 883                 goto end;
 884
 885         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 886         seq_printf(seq, "type:         ");
 887         if (dev->flags.crt)
 888                 seq_printf(seq, "CRT\n");
 889         else if (dev->flags.lcd)
 890                 seq_printf(seq, "LCD\n");
 891         else if (dev->flags.tvout)
 892                 seq_printf(seq, "TVOUT\n");
 893         else if (dev->flags.dvi)
 894                 seq_printf(seq, "DVI\n");
 895         else
 896                 seq_printf(seq, "UNKNOWN\n");
 897
 898         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 899
 900       end:
 901         return 0;
 902 }
 903
 904 static int
 905 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 906 {
 907         return single_open(file, acpi_video_device_info_seq_show,
 908                            PDE(inode)->data);
 909 }
 910
 911 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 912 {
 913         int status;
 914         struct acpi_video_device *dev = seq->private;
 915         unsigned long state;
 916
 917
 918         if (!dev)
 919                 goto end;
 920
 921         status = acpi_video_device_get_state(dev, &state);
 922         seq_printf(seq, "state:     ");
 923         if (ACPI_SUCCESS(status))
 924                 seq_printf(seq, "0x%02lx\n", state);
 925         else
 926                 seq_printf(seq, "<not supported>\n");
 927
 928         status = acpi_video_device_query(dev, &state);
 929         seq_printf(seq, "query:     ");
 930         if (ACPI_SUCCESS(status))
 931                 seq_printf(seq, "0x%02lx\n", state);
 932         else
 933                 seq_printf(seq, "<not supported>\n");
 934
 935       end:
 936         return 0;
 937 }
 938
 939 static int
 940 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 941 {
 942         return single_open(file, acpi_video_device_state_seq_show,
 943                            PDE(inode)->data);
 944 }
 945
 946 static ssize_t
 947 acpi_video_device_write_state(struct file *file,
 948                               const char __user * buffer,
 949                               size_t count, loff_t * data)
 950 {
 951         int status;
 952         struct seq_file *m = file->private_data;
 953         struct acpi_video_device *dev = m->private;
 954         char str[12] = { 0 };
 955         u32 state = 0;
 956
 957
 958         if (!dev || count + 1 > sizeof str)
 959                 return -EINVAL;
 960
 961         if (copy_from_user(str, buffer, count))
 962                 return -EFAULT;
 963
 964         str[count] = 0;
 965         state = simple_strtoul(str, NULL, 0);
 966         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
 967
 968         status = acpi_video_device_set_state(dev, state);
 969
 970         if (status)
 971                 return -EFAULT;
 972
 973         return count;
 974 }
 975
 976 static int
 977 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
 978 {
 979         struct acpi_video_device *dev = seq->private;
 980         int i;
 981
 982
 983         if (!dev || !dev->brightness) {
 984                 seq_printf(seq, "<not supported>\n");
 985                 return 0;
 986         }
 987
 988         seq_printf(seq, "levels: ");
 989         for (i = 0; i < dev->brightness->count; i++)
 990                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 991         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 992
 993         return 0;
 994 }
 995
 996 static int
 997 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
 998 {
 999         return single_open(file, acpi_video_device_brightness_seq_show,
1000                            PDE(inode)->data);
1001 }
1002
1003 static ssize_t
1004 acpi_video_device_write_brightness(struct file *file,
1005                                    const char __user * buffer,
1006                                    size_t count, loff_t * data)
1007 {
1008         struct seq_file *m = file->private_data;
1009         struct acpi_video_device *dev = m->private;
1010         char str[5] = { 0 };
1011         unsigned int level = 0;
1012         int i;
1013
1014
1015         if (!dev || !dev->brightness || count + 1 > sizeof str)
1016                 return -EINVAL;
1017
1018         if (copy_from_user(str, buffer, count))
1019                 return -EFAULT;
1020
1021         str[count] = 0;
1022         level = simple_strtoul(str, NULL, 0);
1023
1024         if (level > 100)
1025                 return -EFAULT;
1026
1027         /* validate through the list of available levels */
1028         for (i = 0; i < dev->brightness->count; i++)
1029                 if (level == dev->brightness->levels[i]) {
1030                         if (ACPI_SUCCESS
1031                             (acpi_video_device_lcd_set_level(dev, level)))
1032                                 dev->brightness->curr = level;
1033                         break;
1034                 }
1035
1036         return count;
1037 }
1038
1039 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1040 {
1041         struct acpi_video_device *dev = seq->private;
1042         int status;
1043         int i;
1044         union acpi_object *edid = NULL;
1045
1046
1047         if (!dev)
1048                 goto out;
1049
1050         status = acpi_video_device_EDID(dev, &edid, 128);
1051         if (ACPI_FAILURE(status)) {
1052                 status = acpi_video_device_EDID(dev, &edid, 256);
1053         }
1054
1055         if (ACPI_FAILURE(status)) {
1056                 goto out;
1057         }
1058
1059         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1060                 for (i = 0; i < edid->buffer.length; i++)
1061                         seq_putc(seq, edid->buffer.pointer[i]);
1062         }
1063
1064       out:
1065         if (!edid)
1066                 seq_printf(seq, "<not supported>\n");
1067         else
1068                 kfree(edid);
1069
1070         return 0;
1071 }
1072
1073 static int
1074 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1075 {
1076         return single_open(file, acpi_video_device_EDID_seq_show,
1077                            PDE(inode)->data);
1078 }
1079
1080 static int acpi_video_device_add_fs(struct acpi_device *device)
1081 {
1082         struct proc_dir_entry *entry = NULL;
1083         struct acpi_video_device *vid_dev;
1084
1085
1086         if (!device)
1087                 return -ENODEV;
1088
1089         vid_dev = acpi_driver_data(device);
1090         if (!vid_dev)
1091                 return -ENODEV;
1092
1093         if (!acpi_device_dir(device)) {
1094                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1095                                                      vid_dev->video->dir);
1096                 if (!acpi_device_dir(device))
1097                         return -ENODEV;
1098                 acpi_device_dir(device)->owner = THIS_MODULE;
1099         }
1100
1101         /* 'info' [R] */
1102         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1103         if (!entry)
1104                 return -ENODEV;
1105         else {
1106                 entry->proc_fops = &acpi_video_device_info_fops;
1107                 entry->data = acpi_driver_data(device);
1108                 entry->owner = THIS_MODULE;
1109         }
1110
1111         /* 'state' [R/W] */
1112         entry =
1113             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
1114                               acpi_device_dir(device));
1115         if (!entry)
1116                 return -ENODEV;
1117         else {
1118                 acpi_video_device_state_fops.write = acpi_video_device_write_state;
1119                 entry->proc_fops = &acpi_video_device_state_fops;
1120                 entry->data = acpi_driver_data(device);
1121                 entry->owner = THIS_MODULE;
1122         }
1123
1124         /* 'brightness' [R/W] */
1125         entry =
1126             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1127                               acpi_device_dir(device));
1128         if (!entry)
1129                 return -ENODEV;
1130         else {
1131                 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
1132                 entry->proc_fops = &acpi_video_device_brightness_fops;
1133                 entry->data = acpi_driver_data(device);
1134                 entry->owner = THIS_MODULE;
1135         }
1136
1137         /* 'EDID' [R] */
1138         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
1139         if (!entry)
1140                 return -ENODEV;
1141         else {
1142                 entry->proc_fops = &acpi_video_device_EDID_fops;
1143                 entry->data = acpi_driver_data(device);
1144                 entry->owner = THIS_MODULE;
1145         }
1146
1147         return 0;
1148 }
1149
1150 static int acpi_video_device_remove_fs(struct acpi_device *device)
1151 {
1152         struct acpi_video_device *vid_dev;
1153
1154         vid_dev = acpi_driver_data(device);
1155         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1156                 return -ENODEV;
1157
1158         if (acpi_device_dir(device)) {
1159                 remove_proc_entry("info", acpi_device_dir(device));
1160                 remove_proc_entry("state", acpi_device_dir(device));
1161                 remove_proc_entry("brightness", acpi_device_dir(device));
1162                 remove_proc_entry("EDID", acpi_device_dir(device));
1163                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1164                 acpi_device_dir(device) = NULL;
1165         }
1166
1167         return 0;
1168 }
1169
1170 /* video bus */
1171 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1172 {
1173         struct acpi_video_bus *video = seq->private;
1174
1175
1176         if (!video)
1177                 goto end;
1178
1179         seq_printf(seq, "Switching heads:              %s\n",
1180                    video->flags.multihead ? "yes" : "no");
1181         seq_printf(seq, "Video ROM:                    %s\n",
1182                    video->flags.rom ? "yes" : "no");
1183         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1184                    video->flags.post ? "yes" : "no");
1185
1186       end:
1187         return 0;
1188 }
1189
1190 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1191 {
1192         return single_open(file, acpi_video_bus_info_seq_show,
1193                            PDE(inode)->data);
1194 }
1195
1196 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1197 {
1198         struct acpi_video_bus *video = seq->private;
1199
1200
1201         if (!video)
1202                 goto end;
1203
1204         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
1205         seq_printf(seq, "<TODO>\n");
1206
1207       end:
1208         return 0;
1209 }
1210
1211 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1212 {
1213         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1214 }
1215
1216 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1217 {
1218         struct acpi_video_bus *video = seq->private;
1219         unsigned long options;
1220         int status;
1221
1222
1223         if (!video)
1224                 goto end;
1225
1226         status = acpi_video_bus_POST_options(video, &options);
1227         if (ACPI_SUCCESS(status)) {
1228                 if (!(options & 1)) {
1229                         printk(KERN_WARNING PREFIX
1230                                "The motherboard VGA device is not listed as a possible POST device.\n");
1231                         printk(KERN_WARNING PREFIX
1232                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1233                 }
1234                 printk("%lx\n", options);
1235                 seq_printf(seq, "can POST: <integrated video>");
1236                 if (options & 2)
1237                         seq_printf(seq, " <PCI video>");
1238                 if (options & 4)
1239                         seq_printf(seq, " <AGP video>");
1240                 seq_putc(seq, '\n');
1241         } else
1242                 seq_printf(seq, "<not supported>\n");
1243       end:
1244         return 0;
1245 }
1246
1247 static int
1248 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1249 {
1250         return single_open(file, acpi_video_bus_POST_info_seq_show,
1251                            PDE(inode)->data);
1252 }
1253
1254 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1255 {
1256         struct acpi_video_bus *video = seq->private;
1257         int status;
1258         unsigned long id;
1259
1260
1261         if (!video)
1262                 goto end;
1263
1264         status = acpi_video_bus_get_POST(video, &id);
1265         if (!ACPI_SUCCESS(status)) {
1266                 seq_printf(seq, "<not supported>\n");
1267                 goto end;
1268         }
1269         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1270
1271       end:
1272         return 0;
1273 }
1274
1275 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1276 {
1277         struct acpi_video_bus *video = seq->private;
1278
1279
1280         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1281
1282         return 0;
1283 }
1284
1285 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1286 {
1287         return single_open(file, acpi_video_bus_POST_seq_show,
1288                            PDE(inode)->data);
1289 }
1290
1291 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1292 {
1293         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1294 }
1295
1296 static ssize_t
1297 acpi_video_bus_write_POST(struct file *file,
1298                           const char __user * buffer,
1299                           size_t count, loff_t * data)
1300 {
1301         int status;
1302         struct seq_file *m = file->private_data;
1303         struct acpi_video_bus *video = m->private;
1304         char str[12] = { 0 };
1305         unsigned long opt, options;
1306
1307
1308         if (!video || count + 1 > sizeof str)
1309                 return -EINVAL;
1310
1311         status = acpi_video_bus_POST_options(video, &options);
1312         if (!ACPI_SUCCESS(status))
1313                 return -EINVAL;
1314
1315         if (copy_from_user(str, buffer, count))
1316                 return -EFAULT;
1317
1318         str[count] = 0;
1319         opt = strtoul(str, NULL, 0);
1320         if (opt > 3)
1321                 return -EFAULT;
1322
1323         /* just in case an OEM 'forgot' the motherboard... */
1324         options |= 1;
1325
1326         if (options & (1ul << opt)) {
1327                 status = acpi_video_bus_set_POST(video, opt);
1328                 if (!ACPI_SUCCESS(status))
1329                         return -EFAULT;
1330
1331         }
1332
1333         return count;
1334 }
1335
1336 static ssize_t
1337 acpi_video_bus_write_DOS(struct file *file,
1338                          const char __user * buffer,
1339                          size_t count, loff_t * data)
1340 {
1341         int status;
1342         struct seq_file *m = file->private_data;
1343         struct acpi_video_bus *video = m->private;
1344         char str[12] = { 0 };
1345         unsigned long opt;
1346
1347
1348         if (!video || count + 1 > sizeof str)
1349                 return -EINVAL;
1350
1351         if (copy_from_user(str, buffer, count))
1352                 return -EFAULT;
1353
1354         str[count] = 0;
1355         opt = strtoul(str, NULL, 0);
1356         if (opt > 7)
1357                 return -EFAULT;
1358
1359         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1360
1361         if (!ACPI_SUCCESS(status))
1362                 return -EFAULT;
1363
1364         return count;
1365 }
1366
1367 static int acpi_video_bus_add_fs(struct acpi_device *device)
1368 {
1369         long device_id;
1370         int status;
1371         struct proc_dir_entry *entry = NULL;
1372         struct acpi_video_bus *video;
1373         struct device *dev;
1374
1375         status =
1376             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1377
1378         if (!ACPI_SUCCESS(status))
1379                 return -ENODEV;
1380
1381         /* We need to attempt to determine whether the _ADR refers to a
1382            PCI device or not. There's no terribly good way to do this,
1383            so the best we can hope for is to assume that there'll never
1384            be a video device in the host bridge */
1385         if (device_id >= 0x10000) {
1386                 /* It looks like a PCI device. Does it exist? */
1387                 dev = acpi_get_physical_device(device->handle);
1388         } else {
1389                 /* It doesn't look like a PCI device. Does its parent
1390                    exist? */
1391                 acpi_handle phandle;
1392                 if (acpi_get_parent(device->handle, &phandle))
1393                         return -ENODEV;
1394                 dev = acpi_get_physical_device(phandle);
1395         }
1396         if (!dev)
1397                 return -ENODEV;
1398         put_device(dev);
1399
1400
1401
1402         video = acpi_driver_data(device);
1403
1404         if (!acpi_device_dir(device)) {
1405                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1406                                                      acpi_video_dir);
1407                 if (!acpi_device_dir(device))
1408                         return -ENODEV;
1409                 video->dir = acpi_device_dir(device);
1410                 acpi_device_dir(device)->owner = THIS_MODULE;
1411         }
1412
1413         /* 'info' [R] */
1414         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1415         if (!entry)
1416                 return -ENODEV;
1417         else {
1418                 entry->proc_fops = &acpi_video_bus_info_fops;
1419                 entry->data = acpi_driver_data(device);
1420                 entry->owner = THIS_MODULE;
1421         }
1422
1423         /* 'ROM' [R] */
1424         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1425         if (!entry)
1426                 return -ENODEV;
1427         else {
1428                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1429                 entry->data = acpi_driver_data(device);
1430                 entry->owner = THIS_MODULE;
1431         }
1432
1433         /* 'POST_info' [R] */
1434         entry =
1435             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1436         if (!entry)
1437                 return -ENODEV;
1438         else {
1439                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1440                 entry->data = acpi_driver_data(device);
1441                 entry->owner = THIS_MODULE;
1442         }
1443
1444         /* 'POST' [R/W] */
1445         entry =
1446             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1447                               acpi_device_dir(device));
1448         if (!entry)
1449                 return -ENODEV;
1450         else {
1451                 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1452                 entry->proc_fops = &acpi_video_bus_POST_fops;
1453                 entry->data = acpi_driver_data(device);
1454                 entry->owner = THIS_MODULE;
1455         }
1456
1457         /* 'DOS' [R/W] */
1458         entry =
1459             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1460                               acpi_device_dir(device));
1461         if (!entry)
1462                 return -ENODEV;
1463         else {
1464                 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1465                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1466                 entry->data = acpi_driver_data(device);
1467                 entry->owner = THIS_MODULE;
1468         }
1469
1470         return 0;
1471 }
1472
1473 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1474 {
1475         struct acpi_video_bus *video;
1476
1477
1478         video = acpi_driver_data(device);
1479
1480         if (acpi_device_dir(device)) {
1481                 remove_proc_entry("info", acpi_device_dir(device));
1482                 remove_proc_entry("ROM", acpi_device_dir(device));
1483                 remove_proc_entry("POST_info", acpi_device_dir(device));
1484                 remove_proc_entry("POST", acpi_device_dir(device));
1485                 remove_proc_entry("DOS", acpi_device_dir(device));
1486                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1487                 acpi_device_dir(device) = NULL;
1488         }
1489
1490         return 0;
1491 }
1492
1493 /* --------------------------------------------------------------------------
1494                                  Driver Interface
1495    -------------------------------------------------------------------------- */
1496
1497 /* device interface */
1498 static struct acpi_video_device_attrib*
1499 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1500 {
1501         int count;
1502
1503         for(count = 0; count < video->attached_count; count++)
1504                 if((video->attached_array[count].value.int_val & 0xffff) == device_id)
1505                         return &(video->attached_array[count].value.attrib);
1506         return NULL;
1507 }
1508
1509 static int
1510 acpi_video_bus_get_one_device(struct acpi_device *device,
1511                               struct acpi_video_bus *video)
1512 {
1513         unsigned long device_id;
1514         int status;
1515         struct acpi_video_device *data;
1516         struct acpi_video_device_attrib* attribute;
1517
1518         if (!device || !video)
1519                 return -EINVAL;
1520
1521         status =
1522             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1523         if (ACPI_SUCCESS(status)) {
1524
1525                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1526                 if (!data)
1527                         return -ENOMEM;
1528
1529                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1530                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1531                 acpi_driver_data(device) = data;
1532
1533                 data->device_id = device_id;
1534                 data->video = video;
1535                 data->dev = device;
1536
1537                 attribute = acpi_video_get_device_attr(video, device_id);
1538
1539                 if((attribute != NULL) && attribute->device_id_scheme) {
1540                         switch (attribute->display_type) {
1541                         case ACPI_VIDEO_DISPLAY_CRT:
1542                                 data->flags.crt = 1;
1543                                 break;
1544                         case ACPI_VIDEO_DISPLAY_TV:
1545                                 data->flags.tvout = 1;
1546                                 break;
1547                         case ACPI_VIDEO_DISPLAY_DVI:
1548                                 data->flags.dvi = 1;
1549                                 break;
1550                         case ACPI_VIDEO_DISPLAY_LCD:
1551                                 data->flags.lcd = 1;
1552                                 break;
1553                         default:
1554                                 data->flags.unknown = 1;
1555                                 break;
1556                         }
1557                         if(attribute->bios_can_detect)
1558                                 data->flags.bios = 1;
1559                 } else
1560                         data->flags.unknown = 1;
1561
1562                 acpi_video_device_bind(video, data);
1563                 acpi_video_device_find_cap(data);
1564
1565                 status = acpi_install_notify_handler(device->handle,
1566                                                      ACPI_DEVICE_NOTIFY,
1567                                                      acpi_video_device_notify,
1568                                                      data);
1569                 if (ACPI_FAILURE(status)) {
1570                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1571                                           "Error installing notify handler\n"));
1572                         if(data->brightness)
1573                                 kfree(data->brightness->levels);
1574                         kfree(data->brightness);
1575                         kfree(data);
1576                         return -ENODEV;
1577                 }
1578
1579                 mutex_lock(&video->device_list_lock);
1580                 list_add_tail(&data->entry, &video->video_device_list);
1581                 mutex_unlock(&video->device_list_lock);
1582
1583                 acpi_video_device_add_fs(device);
1584
1585                 return 0;
1586         }
1587
1588         return -ENOENT;
1589 }
1590
1591 /*
1592  *  Arg:
1593  *      video   : video bus device
1594  *
1595  *  Return:
1596  *      none
1597  *
1598  *  Enumerate the video device list of the video bus,
1599  *  bind the ids with the corresponding video devices
1600  *  under the video bus.
1601  */
1602
1603 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1604 {
1605         struct acpi_video_device *dev;
1606
1607         mutex_lock(&video->device_list_lock);
1608
1609         list_for_each_entry(dev, &video->video_device_list, entry)
1610                 acpi_video_device_bind(video, dev);
1611
1612         mutex_unlock(&video->device_list_lock);
1613 }
1614
1615 /*
1616  *  Arg:
1617  *      video   : video bus device
1618  *      device  : video output device under the video
1619  *              bus
1620  *
1621  *  Return:
1622  *      none
1623  *
1624  *  Bind the ids with the corresponding video devices
1625  *  under the video bus.
1626  */
1627
1628 static void
1629 acpi_video_device_bind(struct acpi_video_bus *video,
1630                        struct acpi_video_device *device)
1631 {
1632         int i;
1633
1634 #define IDS_VAL(i) video->attached_array[i].value.int_val
1635 #define IDS_BIND(i) video->attached_array[i].bind_info
1636
1637         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1638              i < video->attached_count; i++) {
1639                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1640                         IDS_BIND(i) = device;
1641                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1642                 }
1643         }
1644 #undef IDS_VAL
1645 #undef IDS_BIND
1646 }
1647
1648 /*
1649  *  Arg:
1650  *      video   : video bus device
1651  *
1652  *  Return:
1653  *      < 0     : error
1654  *
1655  *  Call _DOD to enumerate all devices attached to display adapter
1656  *
1657  */
1658
1659 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1660 {
1661         int status;
1662         int count;
1663         int i;
1664         struct acpi_video_enumerated_device *active_device_list;
1665         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1666         union acpi_object *dod = NULL;
1667         union acpi_object *obj;
1668
1669         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1670         if (!ACPI_SUCCESS(status)) {
1671                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1672                 return status;
1673         }
1674
1675         dod = buffer.pointer;
1676         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1677                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1678                 status = -EFAULT;
1679                 goto out;
1680         }
1681
1682         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1683                           dod->package.count));
1684
1685         active_device_list = kmalloc((1 +
1686                                       dod->package.count) *
1687                                      sizeof(struct
1688                                             acpi_video_enumerated_device),
1689                                      GFP_KERNEL);
1690
1691         if (!active_device_list) {
1692                 status = -ENOMEM;
1693                 goto out;
1694         }
1695
1696         count = 0;
1697         for (i = 0; i < dod->package.count; i++) {
1698                 obj = &dod->package.elements[i];
1699
1700                 if (obj->type != ACPI_TYPE_INTEGER) {
1701                         printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1702                         active_device_list[i].value.int_val =
1703                             ACPI_VIDEO_HEAD_INVALID;
1704                 }
1705                 active_device_list[i].value.int_val = obj->integer.value;
1706                 active_device_list[i].bind_info = NULL;
1707                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1708                                   (int)obj->integer.value));
1709                 count++;
1710         }
1711         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1712
1713         kfree(video->attached_array);
1714
1715         video->attached_array = active_device_list;
1716         video->attached_count = count;
1717       out:
1718         kfree(buffer.pointer);
1719         return status;
1720 }
1721
1722 static int
1723 acpi_video_get_next_level(struct acpi_video_device *device,
1724                           u32 level_current, u32 event)
1725 {
1726         int min, max, min_above, max_below, i, l, delta = 255;
1727         max = max_below = 0;
1728         min = min_above = 255;
1729         /* Find closest level to level_current */
1730         for (i = 0; i < device->brightness->count; i++) {
1731                 l = device->brightness->levels[i];
1732                 if (abs(l - level_current) < abs(delta)) {
1733                         delta = l - level_current;
1734                         if (!delta)
1735                                 break;
1736                 }
1737         }
1738         /* Ajust level_current to closest available level */
1739         level_current += delta;
1740         for (i = 0; i < device->brightness->count; i++) {
1741                 l = device->brightness->levels[i];
1742                 if (l < min)
1743                         min = l;
1744                 if (l > max)
1745                         max = l;
1746                 if (l < min_above && l > level_current)
1747                         min_above = l;
1748                 if (l > max_below && l < level_current)
1749                         max_below = l;
1750         }
1751
1752         switch (event) {
1753         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1754                 return (level_current < max) ? min_above : min;
1755         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1756                 return (level_current < max) ? min_above : max;
1757         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1758                 return (level_current > min) ? max_below : min;
1759         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1760         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1761                 return 0;
1762         default:
1763                 return level_current;
1764         }
1765 }
1766
1767 static void
1768 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1769 {
1770         unsigned long level_current, level_next;
1771         acpi_video_device_lcd_get_level_current(device, &level_current);
1772         level_next = acpi_video_get_next_level(device, level_current, event);
1773         acpi_video_device_lcd_set_level(device, level_next);
1774 }
1775
1776 static int
1777 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1778                            struct acpi_device *device)
1779 {
1780         int status = 0;
1781         struct acpi_device *dev;
1782
1783         acpi_video_device_enumerate(video);
1784
1785         list_for_each_entry(dev, &device->children, node) {
1786
1787                 status = acpi_video_bus_get_one_device(dev, video);
1788                 if (ACPI_FAILURE(status)) {
1789                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1790                         continue;
1791                 }
1792         }
1793         return status;
1794 }
1795
1796 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1797 {
1798         acpi_status status;
1799         struct acpi_video_bus *video;
1800
1801
1802         if (!device || !device->video)
1803                 return -ENOENT;
1804
1805         video = device->video;
1806
1807         acpi_video_device_remove_fs(device->dev);
1808
1809         status = acpi_remove_notify_handler(device->dev->handle,
1810                                             ACPI_DEVICE_NOTIFY,
1811                                             acpi_video_device_notify);
1812         backlight_device_unregister(device->backlight);
1813         if (device->cdev) {
1814                 sysfs_remove_link(&device->dev->dev.kobj,
1815                                   "thermal_cooling");
1816                 sysfs_remove_link(&device->cdev->device.kobj,
1817                                   "device");
1818                 thermal_cooling_device_unregister(device->cdev);
1819                 device->cdev = NULL;
1820         }
1821         video_output_unregister(device->output_dev);
1822
1823         return 0;
1824 }
1825
1826 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1827 {
1828         int status;
1829         struct acpi_video_device *dev, *next;
1830
1831         mutex_lock(&video->device_list_lock);
1832
1833         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1834
1835                 status = acpi_video_bus_put_one_device(dev);
1836                 if (ACPI_FAILURE(status))
1837                         printk(KERN_WARNING PREFIX
1838                                "hhuuhhuu bug in acpi video driver.\n");
1839
1840                 if (dev->brightness) {
1841                         kfree(dev->brightness->levels);
1842                         kfree(dev->brightness);
1843                 }
1844                 list_del(&dev->entry);
1845                 kfree(dev);
1846         }
1847
1848         mutex_unlock(&video->device_list_lock);
1849
1850         return 0;
1851 }
1852
1853 /* acpi_video interface */
1854
1855 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1856 {
1857         return acpi_video_bus_DOS(video, 0, 0);
1858 }
1859
1860 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1861 {
1862         return acpi_video_bus_DOS(video, 0, 1);
1863 }
1864
1865 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1866 {
1867         struct acpi_video_bus *video = data;
1868         struct acpi_device *device = NULL;
1869         struct input_dev *input;
1870         int keycode;
1871
1872         if (!video)
1873                 return;
1874
1875         device = video->device;
1876         input = video->input;
1877
1878         switch (event) {
1879         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1880                                          * most likely via hotkey. */
1881                 acpi_bus_generate_proc_event(device, event, 0);
1882                 keycode = KEY_SWITCHVIDEOMODE;
1883                 break;
1884
1885         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1886                                          * connector. */
1887                 acpi_video_device_enumerate(video);
1888                 acpi_video_device_rebind(video);
1889                 acpi_bus_generate_proc_event(device, event, 0);
1890                 keycode = KEY_SWITCHVIDEOMODE;
1891                 break;
1892
1893         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1894                 acpi_bus_generate_proc_event(device, event, 0);
1895                 keycode = KEY_SWITCHVIDEOMODE;
1896                 break;
1897         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1898                 acpi_bus_generate_proc_event(device, event, 0);
1899                 keycode = KEY_VIDEO_NEXT;
1900                 break;
1901         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1902                 acpi_bus_generate_proc_event(device, event, 0);
1903                 keycode = KEY_VIDEO_PREV;
1904                 break;
1905
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 void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1923 {
1924         struct acpi_video_device *video_device = data;
1925         struct acpi_device *device = NULL;
1926         struct acpi_video_bus *bus;
1927         struct input_dev *input;
1928         int keycode;
1929
1930         if (!video_device)
1931                 return;
1932
1933         device = video_device->dev;
1934         bus = video_device->video;
1935         input = bus->input;
1936
1937         switch (event) {
1938         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1939                 if (brightness_switch_enabled)
1940                         acpi_video_switch_brightness(video_device, event);
1941                 acpi_bus_generate_proc_event(device, event, 0);
1942                 keycode = KEY_BRIGHTNESS_CYCLE;
1943                 break;
1944         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1945                 if (brightness_switch_enabled)
1946                         acpi_video_switch_brightness(video_device, event);
1947                 acpi_bus_generate_proc_event(device, event, 0);
1948                 keycode = KEY_BRIGHTNESSUP;
1949                 break;
1950         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1951                 if (brightness_switch_enabled)
1952                         acpi_video_switch_brightness(video_device, event);
1953                 acpi_bus_generate_proc_event(device, event, 0);
1954                 keycode = KEY_BRIGHTNESSDOWN;
1955                 break;
1956         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1957                 if (brightness_switch_enabled)
1958                         acpi_video_switch_brightness(video_device, event);
1959                 acpi_bus_generate_proc_event(device, event, 0);
1960                 keycode = KEY_BRIGHTNESS_ZERO;
1961                 break;
1962         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1963                 if (brightness_switch_enabled)
1964                         acpi_video_switch_brightness(video_device, event);
1965                 acpi_bus_generate_proc_event(device, event, 0);
1966                 keycode = KEY_DISPLAY_OFF;
1967                 break;
1968         default:
1969                 keycode = KEY_UNKNOWN;
1970                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1971                                   "Unsupported event [0x%x]\n", event));
1972                 break;
1973         }
1974
1975         acpi_notifier_call_chain(device, event, 0);
1976         input_report_key(input, keycode, 1);
1977         input_sync(input);
1978         input_report_key(input, keycode, 0);
1979         input_sync(input);
1980
1981         return;
1982 }
1983
1984 static int instance;
1985 static int acpi_video_resume(struct acpi_device *device)
1986 {
1987         struct acpi_video_bus *video;
1988         struct acpi_video_device *video_device;
1989         int i;
1990
1991         if (!device || !acpi_driver_data(device))
1992                 return -EINVAL;
1993
1994         video = acpi_driver_data(device);
1995
1996         for (i = 0; i < video->attached_count; i++) {
1997                 video_device = video->attached_array[i].bind_info;
1998                 if (video_device && video_device->backlight)
1999                         acpi_video_set_brightness(video_device->backlight);
2000         }
2001         return AE_OK;
2002 }
2003
2004 static int acpi_video_bus_add(struct acpi_device *device)
2005 {
2006         acpi_status status;
2007         struct acpi_video_bus *video;
2008         struct input_dev *input;
2009         int error;
2010
2011         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2012         if (!video)
2013                 return -ENOMEM;
2014
2015         /* a hack to fix the duplicate name "VID" problem on T61 */
2016         if (!strcmp(device->pnp.bus_id, "VID")) {
2017                 if (instance)
2018                         device->pnp.bus_id[3] = '0' + instance;
2019                 instance ++;
2020         }
2021
2022         video->device = device;
2023         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2024         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2025         acpi_driver_data(device) = video;
2026
2027         acpi_video_bus_find_cap(video);
2028         error = acpi_video_bus_check(video);
2029         if (error)
2030                 goto err_free_video;
2031
2032         error = acpi_video_bus_add_fs(device);
2033         if (error)
2034                 goto err_free_video;
2035
2036         mutex_init(&video->device_list_lock);
2037         INIT_LIST_HEAD(&video->video_device_list);
2038
2039         acpi_video_bus_get_devices(video, device);
2040         acpi_video_bus_start_devices(video);
2041
2042         status = acpi_install_notify_handler(device->handle,
2043                                              ACPI_DEVICE_NOTIFY,
2044                                              acpi_video_bus_notify, video);
2045         if (ACPI_FAILURE(status)) {
2046                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
2047                                   "Error installing notify handler\n"));
2048                 error = -ENODEV;
2049                 goto err_stop_video;
2050         }
2051
2052         video->input = input = input_allocate_device();
2053         if (!input) {
2054                 error = -ENOMEM;
2055                 goto err_uninstall_notify;
2056         }
2057
2058         snprintf(video->phys, sizeof(video->phys),
2059                 "%s/video/input0", acpi_device_hid(video->device));
2060
2061         input->name = acpi_device_name(video->device);
2062         input->phys = video->phys;
2063         input->id.bustype = BUS_HOST;
2064         input->id.product = 0x06;
2065         input->dev.parent = &device->dev;
2066         input->evbit[0] = BIT(EV_KEY);
2067         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2068         set_bit(KEY_VIDEO_NEXT, input->keybit);
2069         set_bit(KEY_VIDEO_PREV, input->keybit);
2070         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2071         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2072         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2073         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2074         set_bit(KEY_DISPLAY_OFF, input->keybit);
2075         set_bit(KEY_UNKNOWN, input->keybit);
2076
2077         error = input_register_device(input);
2078         if (error)
2079                 goto err_free_input_dev;
2080
2081         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2082                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2083                video->flags.multihead ? "yes" : "no",
2084                video->flags.rom ? "yes" : "no",
2085                video->flags.post ? "yes" : "no");
2086
2087         return 0;
2088
2089  err_free_input_dev:
2090         input_free_device(input);
2091  err_uninstall_notify:
2092         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2093                                    acpi_video_bus_notify);
2094  err_stop_video:
2095         acpi_video_bus_stop_devices(video);
2096         acpi_video_bus_put_devices(video);
2097         kfree(video->attached_array);
2098         acpi_video_bus_remove_fs(device);
2099  err_free_video:
2100         kfree(video);
2101         acpi_driver_data(device) = NULL;
2102
2103         return error;
2104 }
2105
2106 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2107 {
2108         acpi_status status = 0;
2109         struct acpi_video_bus *video = NULL;
2110
2111
2112         if (!device || !acpi_driver_data(device))
2113                 return -EINVAL;
2114
2115         video = acpi_driver_data(device);
2116
2117         acpi_video_bus_stop_devices(video);
2118
2119         status = acpi_remove_notify_handler(video->device->handle,
2120                                             ACPI_DEVICE_NOTIFY,
2121                                             acpi_video_bus_notify);
2122
2123         acpi_video_bus_put_devices(video);
2124         acpi_video_bus_remove_fs(device);
2125
2126         input_unregister_device(video->input);
2127         kfree(video->attached_array);
2128         kfree(video);
2129
2130         return 0;
2131 }
2132
2133 static int __init acpi_video_init(void)
2134 {
2135         int result = 0;
2136
2137
2138         /*
2139            acpi_dbg_level = 0xFFFFFFFF;
2140            acpi_dbg_layer = 0x08000000;
2141          */
2142
2143         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2144         if (!acpi_video_dir)
2145                 return -ENODEV;
2146         acpi_video_dir->owner = THIS_MODULE;
2147
2148         result = acpi_bus_register_driver(&acpi_video_bus);
2149         if (result < 0) {
2150                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2151                 return -ENODEV;
2152         }
2153
2154         return 0;
2155 }
2156
2157 static void __exit acpi_video_exit(void)
2158 {
2159
2160         acpi_bus_unregister_driver(&acpi_video_bus);
2161
2162         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2163
2164         return;
2165 }
2166
2167 module_init(acpi_video_init);
2168 module_exit(acpi_video_exit);