SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 acpi_video_bus_add(struct acpi_device *device);
  77 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  78
  79 static const struct acpi_device_id video_device_ids[] = {
  80         {ACPI_VIDEO_HID, 0},
  81         {"", 0},
  82 };
  83 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  84
  85 static struct acpi_driver acpi_video_bus = {
  86         .name = "video",
  87         .class = ACPI_VIDEO_CLASS,
  88         .ids = video_device_ids,
  89         .ops = {
  90                 .add = acpi_video_bus_add,
  91                 .remove = acpi_video_bus_remove,
  92                 },
  93 };
  94
  95 struct acpi_video_bus_flags {
  96         u8 multihead:1;         /* can switch video heads */
  97         u8 rom:1;               /* can retrieve a video rom */
  98         u8 post:1;              /* can configure the head to */
  99         u8 reserved:5;
 100 };
 101
 102 struct acpi_video_bus_cap {
 103         u8 _DOS:1;              /*Enable/Disable output switching */
 104         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 105         u8 _ROM:1;              /*Get ROM Data */
 106         u8 _GPD:1;              /*Get POST Device */
 107         u8 _SPD:1;              /*Set POST Device */
 108         u8 _VPO:1;              /*Video POST Options */
 109         u8 reserved:2;
 110 };
 111
 112 struct acpi_video_device_attrib {
 113         u32 display_index:4;    /* A zero-based instance of the Display */
 114         u32 display_port_attachment:4;  /*This field differentiates the display type */
 115         u32 display_type:4;     /*Describe the specific type in use */
 116         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 117         u32 bios_can_detect:1;  /*BIOS can detect the device */
 118         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 119                                    the VGA device. */
 120         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 121         u32 reserved:10;        /*Must be 0 */
 122         u32 device_id_scheme:1; /*Device ID Scheme */
 123 };
 124
 125 struct acpi_video_enumerated_device {
 126         union {
 127                 u32 int_val;
 128                 struct acpi_video_device_attrib attrib;
 129         } value;
 130         struct acpi_video_device *bind_info;
 131 };
 132
 133 struct acpi_video_bus {
 134         struct acpi_device *device;
 135         u8 dos_setting;
 136         struct acpi_video_enumerated_device *attached_array;
 137         u8 attached_count;
 138         struct acpi_video_bus_cap cap;
 139         struct acpi_video_bus_flags flags;
 140         struct list_head video_device_list;
 141         struct mutex device_list_lock;  /* protects video_device_list */
 142         struct proc_dir_entry *dir;
 143         struct input_dev *input;
 144         char phys[32];  /* for input device */
 145 };
 146
 147 struct acpi_video_device_flags {
 148         u8 crt:1;
 149         u8 lcd:1;
 150         u8 tvout:1;
 151         u8 dvi:1;
 152         u8 bios:1;
 153         u8 unknown:1;
 154         u8 reserved:2;
 155 };
 156
 157 struct acpi_video_device_cap {
 158         u8 _ADR:1;              /*Return the unique ID */
 159         u8 _BCL:1;              /*Query list of brightness control levels supported */
 160         u8 _BCM:1;              /*Set the brightness level */
 161         u8 _BQC:1;              /* Get current brightness level */
 162         u8 _DDC:1;              /*Return the EDID for this device */
 163         u8 _DCS:1;              /*Return status of output device */
 164         u8 _DGS:1;              /*Query graphics state */
 165         u8 _DSS:1;              /*Device state set */
 166 };
 167
 168 struct acpi_video_device_brightness {
 169         int curr;
 170         int count;
 171         int *levels;
 172 };
 173
 174 struct acpi_video_device {
 175         unsigned long device_id;
 176         struct acpi_video_device_flags flags;
 177         struct acpi_video_device_cap cap;
 178         struct list_head entry;
 179         struct acpi_video_bus *video;
 180         struct acpi_device *dev;
 181         struct acpi_video_device_brightness *brightness;
 182         struct backlight_device *backlight;
 183         struct thermal_cooling_device *cdev;
 184         struct output_device *output_dev;
 185 };
 186
 187 /* bus */
 188 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 189 static struct file_operations acpi_video_bus_info_fops = {
 190         .open = acpi_video_bus_info_open_fs,
 191         .read = seq_read,
 192         .llseek = seq_lseek,
 193         .release = single_release,
 194 };
 195
 196 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 197 static struct file_operations acpi_video_bus_ROM_fops = {
 198         .open = acpi_video_bus_ROM_open_fs,
 199         .read = seq_read,
 200         .llseek = seq_lseek,
 201         .release = single_release,
 202 };
 203
 204 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 205                                             struct file *file);
 206 static struct file_operations acpi_video_bus_POST_info_fops = {
 207         .open = acpi_video_bus_POST_info_open_fs,
 208         .read = seq_read,
 209         .llseek = seq_lseek,
 210         .release = single_release,
 211 };
 212
 213 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 214 static struct file_operations acpi_video_bus_POST_fops = {
 215         .open = acpi_video_bus_POST_open_fs,
 216         .read = seq_read,
 217         .llseek = seq_lseek,
 218         .release = single_release,
 219 };
 220
 221 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 222 static struct file_operations acpi_video_bus_DOS_fops = {
 223         .open = acpi_video_bus_DOS_open_fs,
 224         .read = seq_read,
 225         .llseek = seq_lseek,
 226         .release = single_release,
 227 };
 228
 229 /* device */
 230 static int acpi_video_device_info_open_fs(struct inode *inode,
 231                                           struct file *file);
 232 static struct file_operations acpi_video_device_info_fops = {
 233         .open = acpi_video_device_info_open_fs,
 234         .read = seq_read,
 235         .llseek = seq_lseek,
 236         .release = single_release,
 237 };
 238
 239 static int acpi_video_device_state_open_fs(struct inode *inode,
 240                                            struct file *file);
 241 static struct file_operations acpi_video_device_state_fops = {
 242         .open = acpi_video_device_state_open_fs,
 243         .read = seq_read,
 244         .llseek = seq_lseek,
 245         .release = single_release,
 246 };
 247
 248 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 249                                                 struct file *file);
 250 static struct file_operations acpi_video_device_brightness_fops = {
 251         .open = acpi_video_device_brightness_open_fs,
 252         .read = seq_read,
 253         .llseek = seq_lseek,
 254         .release = single_release,
 255 };
 256
 257 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 258                                           struct file *file);
 259 static struct file_operations acpi_video_device_EDID_fops = {
 260         .open = acpi_video_device_EDID_open_fs,
 261         .read = seq_read,
 262         .llseek = seq_lseek,
 263         .release = single_release,
 264 };
 265
 266 static char device_decode[][30] = {
 267         "motherboard VGA device",
 268         "PCI VGA device",
 269         "AGP VGA device",
 270         "UNKNOWN",
 271 };
 272
 273 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 274 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 275 static void acpi_video_device_bind(struct acpi_video_bus *video,
 276                                    struct acpi_video_device *device);
 277 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 278 static int acpi_video_switch_output(struct acpi_video_bus *video, int event);
 279 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 280                         int level);
 281 static int acpi_video_device_lcd_get_level_current(
 282                         struct acpi_video_device *device,
 283                         unsigned long *level);
 284 static int acpi_video_get_next_level(struct acpi_video_device *device,
 285                                      u32 level_current, u32 event);
 286 static void acpi_video_switch_brightness(struct acpi_video_device *device,
 287                                          int event);
 288 static int acpi_video_device_get_state(struct acpi_video_device *device,
 289                             unsigned long *state);
 290 static int acpi_video_output_get(struct output_device *od);
 291 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 292
 293 /*backlight device sysfs support*/
 294 static int acpi_video_get_brightness(struct backlight_device *bd)
 295 {
 296         unsigned long cur_level;
 297         int i;
 298         struct acpi_video_device *vd =
 299                 (struct acpi_video_device *)bl_get_data(bd);
 300         acpi_video_device_lcd_get_level_current(vd, &cur_level);
 301         for (i = 2; i < vd->brightness->count; i++) {
 302                 if (vd->brightness->levels[i] == cur_level)
 303                         /* The first two entries are special - see page 575
 304                            of the ACPI spec 3.0 */
 305                         return i-2;
 306         }
 307         return 0;
 308 }
 309
 310 static int acpi_video_set_brightness(struct backlight_device *bd)
 311 {
 312         int request_level = bd->props.brightness+2;
 313         struct acpi_video_device *vd =
 314                 (struct acpi_video_device *)bl_get_data(bd);
 315         acpi_video_device_lcd_set_level(vd,
 316                                         vd->brightness->levels[request_level]);
 317         return 0;
 318 }
 319
 320 static struct backlight_ops acpi_backlight_ops = {
 321         .get_brightness = acpi_video_get_brightness,
 322         .update_status  = acpi_video_set_brightness,
 323 };
 324
 325 /*video output device sysfs support*/
 326 static int acpi_video_output_get(struct output_device *od)
 327 {
 328         unsigned long state;
 329         struct acpi_video_device *vd =
 330                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 331         acpi_video_device_get_state(vd, &state);
 332         return (int)state;
 333 }
 334
 335 static int acpi_video_output_set(struct output_device *od)
 336 {
 337         unsigned long state = od->request_state;
 338         struct acpi_video_device *vd=
 339                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 340         return acpi_video_device_set_state(vd, state);
 341 }
 342
 343 static struct output_properties acpi_output_properties = {
 344         .set_state = acpi_video_output_set,
 345         .get_status = acpi_video_output_get,
 346 };
 347
 348
 349 /* thermal cooling device callbacks */
 350 static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
 351 {
 352         struct acpi_device *device = cdev->devdata;
 353         struct acpi_video_device *video = acpi_driver_data(device);
 354
 355         return sprintf(buf, "%d\n", video->brightness->count - 3);
 356 }
 357
 358 static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
 359 {
 360         struct acpi_device *device = cdev->devdata;
 361         struct acpi_video_device *video = acpi_driver_data(device);
 362         unsigned long level;
 363         int state;
 364
 365         acpi_video_device_lcd_get_level_current(video, &level);
 366         for (state = 2; state < video->brightness->count; state++)
 367                 if (level == video->brightness->levels[state])
 368                         return sprintf(buf, "%d\n",
 369                                        video->brightness->count - state - 1);
 370
 371         return -EINVAL;
 372 }
 373
 374 static int
 375 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
 376 {
 377         struct acpi_device *device = cdev->devdata;
 378         struct acpi_video_device *video = acpi_driver_data(device);
 379         int level;
 380
 381         if ( state >= video->brightness->count - 2)
 382                 return -EINVAL;
 383
 384         state = video->brightness->count - state;
 385         level = video->brightness->levels[state -1];
 386         return acpi_video_device_lcd_set_level(video, level);
 387 }
 388
 389 static struct thermal_cooling_device_ops video_cooling_ops = {
 390         .get_max_state = video_get_max_state,
 391         .get_cur_state = video_get_cur_state,
 392         .set_cur_state = video_set_cur_state,
 393 };
 394
 395 /* --------------------------------------------------------------------------
 396                                Video Management
 397    -------------------------------------------------------------------------- */
 398
 399 /* device */
 400
 401 static int
 402 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
 403 {
 404         int status;
 405
 406         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 407
 408         return status;
 409 }
 410
 411 static int
 412 acpi_video_device_get_state(struct acpi_video_device *device,
 413                             unsigned long *state)
 414 {
 415         int status;
 416
 417         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 418
 419         return status;
 420 }
 421
 422 static int
 423 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 424 {
 425         int status;
 426         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 427         struct acpi_object_list args = { 1, &arg0 };
 428         unsigned long ret;
 429
 430
 431         arg0.integer.value = state;
 432         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 433
 434         return status;
 435 }
 436
 437 static int
 438 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 439                                    union acpi_object **levels)
 440 {
 441         int status;
 442         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 443         union acpi_object *obj;
 444
 445
 446         *levels = NULL;
 447
 448         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 449         if (!ACPI_SUCCESS(status))
 450                 return status;
 451         obj = (union acpi_object *)buffer.pointer;
 452         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 453                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 454                 status = -EFAULT;
 455                 goto err;
 456         }
 457
 458         *levels = obj;
 459
 460         return 0;
 461
 462       err:
 463         kfree(buffer.pointer);
 464
 465         return status;
 466 }
 467
 468 static int
 469 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 470 {
 471         int status = AE_OK;
 472         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 473         struct acpi_object_list args = { 1, &arg0 };
 474
 475
 476         arg0.integer.value = level;
 477
 478         if (device->cap._BCM)
 479                 status = acpi_evaluate_object(device->dev->handle, "_BCM",
 480                                               &args, NULL);
 481         device->brightness->curr = level;
 482         return status;
 483 }
 484
 485 static int
 486 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 487                                         unsigned long *level)
 488 {
 489         if (device->cap._BQC)
 490                 return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
 491                                              level);
 492         *level = device->brightness->curr;
 493         return AE_OK;
 494 }
 495
 496 static int
 497 acpi_video_device_EDID(struct acpi_video_device *device,
 498                        union acpi_object **edid, ssize_t length)
 499 {
 500         int status;
 501         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 502         union acpi_object *obj;
 503         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 504         struct acpi_object_list args = { 1, &arg0 };
 505
 506
 507         *edid = NULL;
 508
 509         if (!device)
 510                 return -ENODEV;
 511         if (length == 128)
 512                 arg0.integer.value = 1;
 513         else if (length == 256)
 514                 arg0.integer.value = 2;
 515         else
 516                 return -EINVAL;
 517
 518         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 519         if (ACPI_FAILURE(status))
 520                 return -ENODEV;
 521
 522         obj = buffer.pointer;
 523
 524         if (obj && obj->type == ACPI_TYPE_BUFFER)
 525                 *edid = obj;
 526         else {
 527                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 528                 status = -EFAULT;
 529                 kfree(obj);
 530         }
 531
 532         return status;
 533 }
 534
 535 /* bus */
 536
 537 static int
 538 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 539 {
 540         int status;
 541         unsigned long tmp;
 542         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 543         struct acpi_object_list args = { 1, &arg0 };
 544
 545
 546         arg0.integer.value = option;
 547
 548         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 549         if (ACPI_SUCCESS(status))
 550                 status = tmp ? (-EINVAL) : (AE_OK);
 551
 552         return status;
 553 }
 554
 555 static int
 556 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
 557 {
 558         int status;
 559
 560         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 561
 562         return status;
 563 }
 564
 565 static int
 566 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 567                             unsigned long *options)
 568 {
 569         int status;
 570
 571         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 572         *options &= 3;
 573
 574         return status;
 575 }
 576
 577 /*
 578  *  Arg:
 579  *      video           : video bus device pointer
 580  *      bios_flag       :
 581  *              0.      The system BIOS should NOT automatically switch(toggle)
 582  *                      the active display output.
 583  *              1.      The system BIOS should automatically switch (toggle) the
 584  *                      active display output. No switch event.
 585  *              2.      The _DGS value should be locked.
 586  *              3.      The system BIOS should not automatically switch (toggle) the
 587  *                      active display output, but instead generate the display switch
 588  *                      event notify code.
 589  *      lcd_flag        :
 590  *              0.      The system BIOS should automatically control the brightness level
 591  *                      of the LCD when the power changes from AC to DC
 592  *              1.      The system BIOS should NOT automatically control the brightness
 593  *                      level of the LCD when the power changes from AC to DC.
 594  * Return Value:
 595  *              -1      wrong arg.
 596  */
 597
 598 static int
 599 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 600 {
 601         acpi_integer status = 0;
 602         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 603         struct acpi_object_list args = { 1, &arg0 };
 604
 605
 606         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 607                 status = -1;
 608                 goto Failed;
 609         }
 610         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 611         video->dos_setting = arg0.integer.value;
 612         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 613
 614       Failed:
 615         return status;
 616 }
 617
 618 /*
 619  *  Arg:
 620  *      device  : video output device (LCD, CRT, ..)
 621  *
 622  *  Return Value:
 623  *      None
 624  *
 625  *  Find out all required AML methods defined under the output
 626  *  device.
 627  */
 628
 629 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 630 {
 631         acpi_handle h_dummy1;
 632         int i;
 633         u32 max_level = 0;
 634         union acpi_object *obj = NULL;
 635         struct acpi_video_device_brightness *br = NULL;
 636
 637
 638         memset(&device->cap, 0, sizeof(device->cap));
 639
 640         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 641                 device->cap._ADR = 1;
 642         }
 643         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 644                 device->cap._BCL = 1;
 645         }
 646         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 647                 device->cap._BCM = 1;
 648         }
 649         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 650                 device->cap._BQC = 1;
 651         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 652                 device->cap._DDC = 1;
 653         }
 654         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 655                 device->cap._DCS = 1;
 656         }
 657         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 658                 device->cap._DGS = 1;
 659         }
 660         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 661                 device->cap._DSS = 1;
 662         }
 663
 664         if (ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 665
 666                 if (obj->package.count >= 2) {
 667                         int count = 0;
 668                         union acpi_object *o;
 669
 670                         br = kzalloc(sizeof(*br), GFP_KERNEL);
 671                         if (!br) {
 672                                 printk(KERN_ERR "can't allocate memory\n");
 673                         } else {
 674                                 br->levels = kmalloc(obj->package.count *
 675                                                      sizeof *(br->levels), GFP_KERNEL);
 676                                 if (!br->levels)
 677                                         goto out;
 678
 679                                 for (i = 0; i < obj->package.count; i++) {
 680                                         o = (union acpi_object *)&obj->package.
 681                                             elements[i];
 682                                         if (o->type != ACPI_TYPE_INTEGER) {
 683                                                 printk(KERN_ERR PREFIX "Invalid data\n");
 684                                                 continue;
 685                                         }
 686                                         br->levels[count] = (u32) o->integer.value;
 687
 688                                         if (br->levels[count] > max_level)
 689                                                 max_level = br->levels[count];
 690                                         count++;
 691                                 }
 692                               out:
 693                                 if (count < 2) {
 694                                         kfree(br->levels);
 695                                         kfree(br);
 696                                 } else {
 697                                         br->count = count;
 698                                         device->brightness = br;
 699                                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 700                                                           "found %d brightness levels\n",
 701                                                           count));
 702                                 }
 703                         }
 704                 }
 705
 706         } else {
 707                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available LCD brightness level\n"));
 708         }
 709
 710         kfree(obj);
 711
 712         if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
 713                 int result;
 714                 static int count = 0;
 715                 char *name;
 716                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 717                 if (!name)
 718                         return;
 719
 720                 sprintf(name, "acpi_video%d", count++);
 721                 device->backlight = backlight_device_register(name,
 722                         NULL, device, &acpi_backlight_ops);
 723                 device->backlight->props.max_brightness = device->brightness->count-3;
 724                 device->backlight->props.brightness = acpi_video_get_brightness(device->backlight);
 725                 backlight_update_status(device->backlight);
 726                 kfree(name);
 727
 728                 device->cdev = thermal_cooling_device_register("LCD",
 729                                         device->dev, &video_cooling_ops);
 730                 if (device->cdev) {
 731                         printk(KERN_INFO PREFIX
 732                                 "%s is registered as cooling_device%d\n",
 733                                 device->dev->dev.bus_id, device->cdev->id);
 734                         result = sysfs_create_link(&device->dev->dev.kobj,
 735                                           &device->cdev->device.kobj,
 736                                           "thermal_cooling");
 737                         if (result)
 738                                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 739                         result = sysfs_create_link(&device->cdev->device.kobj,
 740                                           &device->dev->dev.kobj,
 741                                           "device");
 742                         if (result)
 743                                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 744                 }
 745         }
 746         if (device->cap._DCS && device->cap._DSS){
 747                 static int count = 0;
 748                 char *name;
 749                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 750                 if (!name)
 751                         return;
 752                 sprintf(name, "acpi_video%d", count++);
 753                 device->output_dev = video_output_register(name,
 754                                 NULL, device, &acpi_output_properties);
 755                 kfree(name);
 756         }
 757         return;
 758 }
 759
 760 /*
 761  *  Arg:
 762  *      device  : video output device (VGA)
 763  *
 764  *  Return Value:
 765  *      None
 766  *
 767  *  Find out all required AML methods defined under the video bus device.
 768  */
 769
 770 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 771 {
 772         acpi_handle h_dummy1;
 773
 774         memset(&video->cap, 0, sizeof(video->cap));
 775         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 776                 video->cap._DOS = 1;
 777         }
 778         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 779                 video->cap._DOD = 1;
 780         }
 781         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 782                 video->cap._ROM = 1;
 783         }
 784         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 785                 video->cap._GPD = 1;
 786         }
 787         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 788                 video->cap._SPD = 1;
 789         }
 790         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 791                 video->cap._VPO = 1;
 792         }
 793 }
 794
 795 /*
 796  * Check whether the video bus device has required AML method to
 797  * support the desired features
 798  */
 799
 800 static int acpi_video_bus_check(struct acpi_video_bus *video)
 801 {
 802         acpi_status status = -ENOENT;
 803
 804
 805         if (!video)
 806                 return -EINVAL;
 807
 808         /* Since there is no HID, CID and so on for VGA driver, we have
 809          * to check well known required nodes.
 810          */
 811
 812         /* Does this device support video switching? */
 813         if (video->cap._DOS) {
 814                 video->flags.multihead = 1;
 815                 status = 0;
 816         }
 817
 818         /* Does this device support retrieving a video ROM? */
 819         if (video->cap._ROM) {
 820                 video->flags.rom = 1;
 821                 status = 0;
 822         }
 823
 824         /* Does this device support configuring which video device to POST? */
 825         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 826                 video->flags.post = 1;
 827                 status = 0;
 828         }
 829
 830         return status;
 831 }
 832
 833 /* --------------------------------------------------------------------------
 834                               FS Interface (/proc)
 835    -------------------------------------------------------------------------- */
 836
 837 static struct proc_dir_entry *acpi_video_dir;
 838
 839 /* video devices */
 840
 841 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 842 {
 843         struct acpi_video_device *dev = seq->private;
 844
 845
 846         if (!dev)
 847                 goto end;
 848
 849         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 850         seq_printf(seq, "type:         ");
 851         if (dev->flags.crt)
 852                 seq_printf(seq, "CRT\n");
 853         else if (dev->flags.lcd)
 854                 seq_printf(seq, "LCD\n");
 855         else if (dev->flags.tvout)
 856                 seq_printf(seq, "TVOUT\n");
 857         else if (dev->flags.dvi)
 858                 seq_printf(seq, "DVI\n");
 859         else
 860                 seq_printf(seq, "UNKNOWN\n");
 861
 862         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 863
 864       end:
 865         return 0;
 866 }
 867
 868 static int
 869 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 870 {
 871         return single_open(file, acpi_video_device_info_seq_show,
 872                            PDE(inode)->data);
 873 }
 874
 875 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 876 {
 877         int status;
 878         struct acpi_video_device *dev = seq->private;
 879         unsigned long state;
 880
 881
 882         if (!dev)
 883                 goto end;
 884
 885         status = acpi_video_device_get_state(dev, &state);
 886         seq_printf(seq, "state:     ");
 887         if (ACPI_SUCCESS(status))
 888                 seq_printf(seq, "0x%02lx\n", state);
 889         else
 890                 seq_printf(seq, "<not supported>\n");
 891
 892         status = acpi_video_device_query(dev, &state);
 893         seq_printf(seq, "query:     ");
 894         if (ACPI_SUCCESS(status))
 895                 seq_printf(seq, "0x%02lx\n", state);
 896         else
 897                 seq_printf(seq, "<not supported>\n");
 898
 899       end:
 900         return 0;
 901 }
 902
 903 static int
 904 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 905 {
 906         return single_open(file, acpi_video_device_state_seq_show,
 907                            PDE(inode)->data);
 908 }
 909
 910 static ssize_t
 911 acpi_video_device_write_state(struct file *file,
 912                               const char __user * buffer,
 913                               size_t count, loff_t * data)
 914 {
 915         int status;
 916         struct seq_file *m = file->private_data;
 917         struct acpi_video_device *dev = m->private;
 918         char str[12] = { 0 };
 919         u32 state = 0;
 920
 921
 922         if (!dev || count + 1 > sizeof str)
 923                 return -EINVAL;
 924
 925         if (copy_from_user(str, buffer, count))
 926                 return -EFAULT;
 927
 928         str[count] = 0;
 929         state = simple_strtoul(str, NULL, 0);
 930         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
 931
 932         status = acpi_video_device_set_state(dev, state);
 933
 934         if (status)
 935                 return -EFAULT;
 936
 937         return count;
 938 }
 939
 940 static int
 941 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
 942 {
 943         struct acpi_video_device *dev = seq->private;
 944         int i;
 945
 946
 947         if (!dev || !dev->brightness) {
 948                 seq_printf(seq, "<not supported>\n");
 949                 return 0;
 950         }
 951
 952         seq_printf(seq, "levels: ");
 953         for (i = 0; i < dev->brightness->count; i++)
 954                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 955         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 956
 957         return 0;
 958 }
 959
 960 static int
 961 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
 962 {
 963         return single_open(file, acpi_video_device_brightness_seq_show,
 964                            PDE(inode)->data);
 965 }
 966
 967 static ssize_t
 968 acpi_video_device_write_brightness(struct file *file,
 969                                    const char __user * buffer,
 970                                    size_t count, loff_t * data)
 971 {
 972         struct seq_file *m = file->private_data;
 973         struct acpi_video_device *dev = m->private;
 974         char str[5] = { 0 };
 975         unsigned int level = 0;
 976         int i;
 977
 978
 979         if (!dev || !dev->brightness || count + 1 > sizeof str)
 980                 return -EINVAL;
 981
 982         if (copy_from_user(str, buffer, count))
 983                 return -EFAULT;
 984
 985         str[count] = 0;
 986         level = simple_strtoul(str, NULL, 0);
 987
 988         if (level > 100)
 989                 return -EFAULT;
 990
 991         /* validate through the list of available levels */
 992         for (i = 0; i < dev->brightness->count; i++)
 993                 if (level == dev->brightness->levels[i]) {
 994                         if (ACPI_SUCCESS
 995                             (acpi_video_device_lcd_set_level(dev, level)))
 996                                 dev->brightness->curr = level;
 997                         break;
 998                 }
 999
1000         return count;
1001 }
1002
1003 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1004 {
1005         struct acpi_video_device *dev = seq->private;
1006         int status;
1007         int i;
1008         union acpi_object *edid = NULL;
1009
1010
1011         if (!dev)
1012                 goto out;
1013
1014         status = acpi_video_device_EDID(dev, &edid, 128);
1015         if (ACPI_FAILURE(status)) {
1016                 status = acpi_video_device_EDID(dev, &edid, 256);
1017         }
1018
1019         if (ACPI_FAILURE(status)) {
1020                 goto out;
1021         }
1022
1023         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1024                 for (i = 0; i < edid->buffer.length; i++)
1025                         seq_putc(seq, edid->buffer.pointer[i]);
1026         }
1027
1028       out:
1029         if (!edid)
1030                 seq_printf(seq, "<not supported>\n");
1031         else
1032                 kfree(edid);
1033
1034         return 0;
1035 }
1036
1037 static int
1038 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1039 {
1040         return single_open(file, acpi_video_device_EDID_seq_show,
1041                            PDE(inode)->data);
1042 }
1043
1044 static int acpi_video_device_add_fs(struct acpi_device *device)
1045 {
1046         struct proc_dir_entry *entry = NULL;
1047         struct acpi_video_device *vid_dev;
1048
1049
1050         if (!device)
1051                 return -ENODEV;
1052
1053         vid_dev = acpi_driver_data(device);
1054         if (!vid_dev)
1055                 return -ENODEV;
1056
1057         if (!acpi_device_dir(device)) {
1058                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1059                                                      vid_dev->video->dir);
1060                 if (!acpi_device_dir(device))
1061                         return -ENODEV;
1062                 acpi_device_dir(device)->owner = THIS_MODULE;
1063         }
1064
1065         /* 'info' [R] */
1066         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1067         if (!entry)
1068                 return -ENODEV;
1069         else {
1070                 entry->proc_fops = &acpi_video_device_info_fops;
1071                 entry->data = acpi_driver_data(device);
1072                 entry->owner = THIS_MODULE;
1073         }
1074
1075         /* 'state' [R/W] */
1076         entry =
1077             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
1078                               acpi_device_dir(device));
1079         if (!entry)
1080                 return -ENODEV;
1081         else {
1082                 acpi_video_device_state_fops.write = acpi_video_device_write_state;
1083                 entry->proc_fops = &acpi_video_device_state_fops;
1084                 entry->data = acpi_driver_data(device);
1085                 entry->owner = THIS_MODULE;
1086         }
1087
1088         /* 'brightness' [R/W] */
1089         entry =
1090             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1091                               acpi_device_dir(device));
1092         if (!entry)
1093                 return -ENODEV;
1094         else {
1095                 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
1096                 entry->proc_fops = &acpi_video_device_brightness_fops;
1097                 entry->data = acpi_driver_data(device);
1098                 entry->owner = THIS_MODULE;
1099         }
1100
1101         /* 'EDID' [R] */
1102         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
1103         if (!entry)
1104                 return -ENODEV;
1105         else {
1106                 entry->proc_fops = &acpi_video_device_EDID_fops;
1107                 entry->data = acpi_driver_data(device);
1108                 entry->owner = THIS_MODULE;
1109         }
1110
1111         return 0;
1112 }
1113
1114 static int acpi_video_device_remove_fs(struct acpi_device *device)
1115 {
1116         struct acpi_video_device *vid_dev;
1117
1118         vid_dev = acpi_driver_data(device);
1119         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1120                 return -ENODEV;
1121
1122         if (acpi_device_dir(device)) {
1123                 remove_proc_entry("info", acpi_device_dir(device));
1124                 remove_proc_entry("state", acpi_device_dir(device));
1125                 remove_proc_entry("brightness", acpi_device_dir(device));
1126                 remove_proc_entry("EDID", acpi_device_dir(device));
1127                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1128                 acpi_device_dir(device) = NULL;
1129         }
1130
1131         return 0;
1132 }
1133
1134 /* video bus */
1135 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1136 {
1137         struct acpi_video_bus *video = seq->private;
1138
1139
1140         if (!video)
1141                 goto end;
1142
1143         seq_printf(seq, "Switching heads:              %s\n",
1144                    video->flags.multihead ? "yes" : "no");
1145         seq_printf(seq, "Video ROM:                    %s\n",
1146                    video->flags.rom ? "yes" : "no");
1147         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1148                    video->flags.post ? "yes" : "no");
1149
1150       end:
1151         return 0;
1152 }
1153
1154 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1155 {
1156         return single_open(file, acpi_video_bus_info_seq_show,
1157                            PDE(inode)->data);
1158 }
1159
1160 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1161 {
1162         struct acpi_video_bus *video = seq->private;
1163
1164
1165         if (!video)
1166                 goto end;
1167
1168         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
1169         seq_printf(seq, "<TODO>\n");
1170
1171       end:
1172         return 0;
1173 }
1174
1175 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1176 {
1177         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1178 }
1179
1180 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1181 {
1182         struct acpi_video_bus *video = seq->private;
1183         unsigned long options;
1184         int status;
1185
1186
1187         if (!video)
1188                 goto end;
1189
1190         status = acpi_video_bus_POST_options(video, &options);
1191         if (ACPI_SUCCESS(status)) {
1192                 if (!(options & 1)) {
1193                         printk(KERN_WARNING PREFIX
1194                                "The motherboard VGA device is not listed as a possible POST device.\n");
1195                         printk(KERN_WARNING PREFIX
1196                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1197                 }
1198                 printk("%lx\n", options);
1199                 seq_printf(seq, "can POST: <integrated video>");
1200                 if (options & 2)
1201                         seq_printf(seq, " <PCI video>");
1202                 if (options & 4)
1203                         seq_printf(seq, " <AGP video>");
1204                 seq_putc(seq, '\n');
1205         } else
1206                 seq_printf(seq, "<not supported>\n");
1207       end:
1208         return 0;
1209 }
1210
1211 static int
1212 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1213 {
1214         return single_open(file, acpi_video_bus_POST_info_seq_show,
1215                            PDE(inode)->data);
1216 }
1217
1218 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1219 {
1220         struct acpi_video_bus *video = seq->private;
1221         int status;
1222         unsigned long id;
1223
1224
1225         if (!video)
1226                 goto end;
1227
1228         status = acpi_video_bus_get_POST(video, &id);
1229         if (!ACPI_SUCCESS(status)) {
1230                 seq_printf(seq, "<not supported>\n");
1231                 goto end;
1232         }
1233         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1234
1235       end:
1236         return 0;
1237 }
1238
1239 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1240 {
1241         struct acpi_video_bus *video = seq->private;
1242
1243
1244         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1245
1246         return 0;
1247 }
1248
1249 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1250 {
1251         return single_open(file, acpi_video_bus_POST_seq_show,
1252                            PDE(inode)->data);
1253 }
1254
1255 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1256 {
1257         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1258 }
1259
1260 static ssize_t
1261 acpi_video_bus_write_POST(struct file *file,
1262                           const char __user * buffer,
1263                           size_t count, loff_t * data)
1264 {
1265         int status;
1266         struct seq_file *m = file->private_data;
1267         struct acpi_video_bus *video = m->private;
1268         char str[12] = { 0 };
1269         unsigned long opt, options;
1270
1271
1272         if (!video || count + 1 > sizeof str)
1273                 return -EINVAL;
1274
1275         status = acpi_video_bus_POST_options(video, &options);
1276         if (!ACPI_SUCCESS(status))
1277                 return -EINVAL;
1278
1279         if (copy_from_user(str, buffer, count))
1280                 return -EFAULT;
1281
1282         str[count] = 0;
1283         opt = strtoul(str, NULL, 0);
1284         if (opt > 3)
1285                 return -EFAULT;
1286
1287         /* just in case an OEM 'forgot' the motherboard... */
1288         options |= 1;
1289
1290         if (options & (1ul << opt)) {
1291                 status = acpi_video_bus_set_POST(video, opt);
1292                 if (!ACPI_SUCCESS(status))
1293                         return -EFAULT;
1294
1295         }
1296
1297         return count;
1298 }
1299
1300 static ssize_t
1301 acpi_video_bus_write_DOS(struct file *file,
1302                          const char __user * buffer,
1303                          size_t count, loff_t * data)
1304 {
1305         int status;
1306         struct seq_file *m = file->private_data;
1307         struct acpi_video_bus *video = m->private;
1308         char str[12] = { 0 };
1309         unsigned long opt;
1310
1311
1312         if (!video || count + 1 > sizeof str)
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 > 7)
1321                 return -EFAULT;
1322
1323         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1324
1325         if (!ACPI_SUCCESS(status))
1326                 return -EFAULT;
1327
1328         return count;
1329 }
1330
1331 static int acpi_video_bus_add_fs(struct acpi_device *device)
1332 {
1333         long device_id;
1334         int status;
1335         struct proc_dir_entry *entry = NULL;
1336         struct acpi_video_bus *video;
1337         struct device *dev;
1338
1339         status =
1340             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1341
1342         if (!ACPI_SUCCESS(status))
1343                 return -ENODEV;
1344
1345         /* We need to attempt to determine whether the _ADR refers to a
1346            PCI device or not. There's no terribly good way to do this,
1347            so the best we can hope for is to assume that there'll never
1348            be a video device in the host bridge */
1349         if (device_id >= 0x10000) {
1350                 /* It looks like a PCI device. Does it exist? */
1351                 dev = acpi_get_physical_device(device->handle);
1352         } else {
1353                 /* It doesn't look like a PCI device. Does its parent
1354                    exist? */
1355                 acpi_handle phandle;
1356                 if (acpi_get_parent(device->handle, &phandle))
1357                         return -ENODEV;
1358                 dev = acpi_get_physical_device(phandle);
1359         }
1360         if (!dev)
1361                 return -ENODEV;
1362         put_device(dev);
1363
1364
1365
1366         video = acpi_driver_data(device);
1367
1368         if (!acpi_device_dir(device)) {
1369                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1370                                                      acpi_video_dir);
1371                 if (!acpi_device_dir(device))
1372                         return -ENODEV;
1373                 video->dir = acpi_device_dir(device);
1374                 acpi_device_dir(device)->owner = THIS_MODULE;
1375         }
1376
1377         /* 'info' [R] */
1378         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1379         if (!entry)
1380                 return -ENODEV;
1381         else {
1382                 entry->proc_fops = &acpi_video_bus_info_fops;
1383                 entry->data = acpi_driver_data(device);
1384                 entry->owner = THIS_MODULE;
1385         }
1386
1387         /* 'ROM' [R] */
1388         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1389         if (!entry)
1390                 return -ENODEV;
1391         else {
1392                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1393                 entry->data = acpi_driver_data(device);
1394                 entry->owner = THIS_MODULE;
1395         }
1396
1397         /* 'POST_info' [R] */
1398         entry =
1399             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1400         if (!entry)
1401                 return -ENODEV;
1402         else {
1403                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1404                 entry->data = acpi_driver_data(device);
1405                 entry->owner = THIS_MODULE;
1406         }
1407
1408         /* 'POST' [R/W] */
1409         entry =
1410             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1411                               acpi_device_dir(device));
1412         if (!entry)
1413                 return -ENODEV;
1414         else {
1415                 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1416                 entry->proc_fops = &acpi_video_bus_POST_fops;
1417                 entry->data = acpi_driver_data(device);
1418                 entry->owner = THIS_MODULE;
1419         }
1420
1421         /* 'DOS' [R/W] */
1422         entry =
1423             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1424                               acpi_device_dir(device));
1425         if (!entry)
1426                 return -ENODEV;
1427         else {
1428                 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1429                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1430                 entry->data = acpi_driver_data(device);
1431                 entry->owner = THIS_MODULE;
1432         }
1433
1434         return 0;
1435 }
1436
1437 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1438 {
1439         struct acpi_video_bus *video;
1440
1441
1442         video = acpi_driver_data(device);
1443
1444         if (acpi_device_dir(device)) {
1445                 remove_proc_entry("info", acpi_device_dir(device));
1446                 remove_proc_entry("ROM", acpi_device_dir(device));
1447                 remove_proc_entry("POST_info", acpi_device_dir(device));
1448                 remove_proc_entry("POST", acpi_device_dir(device));
1449                 remove_proc_entry("DOS", acpi_device_dir(device));
1450                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1451                 acpi_device_dir(device) = NULL;
1452         }
1453
1454         return 0;
1455 }
1456
1457 /* --------------------------------------------------------------------------
1458                                  Driver Interface
1459    -------------------------------------------------------------------------- */
1460
1461 /* device interface */
1462 static struct acpi_video_device_attrib*
1463 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1464 {
1465         int count;
1466
1467         for(count = 0; count < video->attached_count; count++)
1468                 if((video->attached_array[count].value.int_val & 0xffff) == device_id)
1469                         return &(video->attached_array[count].value.attrib);
1470         return NULL;
1471 }
1472
1473 static int
1474 acpi_video_bus_get_one_device(struct acpi_device *device,
1475                               struct acpi_video_bus *video)
1476 {
1477         unsigned long device_id;
1478         int status;
1479         struct acpi_video_device *data;
1480         struct acpi_video_device_attrib* attribute;
1481
1482         if (!device || !video)
1483                 return -EINVAL;
1484
1485         status =
1486             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1487         if (ACPI_SUCCESS(status)) {
1488
1489                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1490                 if (!data)
1491                         return -ENOMEM;
1492
1493                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1494                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1495                 acpi_driver_data(device) = data;
1496
1497                 data->device_id = device_id;
1498                 data->video = video;
1499                 data->dev = device;
1500
1501                 attribute = acpi_video_get_device_attr(video, device_id);
1502
1503                 if((attribute != NULL) && attribute->device_id_scheme) {
1504                         switch (attribute->display_type) {
1505                         case ACPI_VIDEO_DISPLAY_CRT:
1506                                 data->flags.crt = 1;
1507                                 break;
1508                         case ACPI_VIDEO_DISPLAY_TV:
1509                                 data->flags.tvout = 1;
1510                                 break;
1511                         case ACPI_VIDEO_DISPLAY_DVI:
1512                                 data->flags.dvi = 1;
1513                                 break;
1514                         case ACPI_VIDEO_DISPLAY_LCD:
1515                                 data->flags.lcd = 1;
1516                                 break;
1517                         default:
1518                                 data->flags.unknown = 1;
1519                                 break;
1520                         }
1521                         if(attribute->bios_can_detect)
1522                                 data->flags.bios = 1;
1523                 } else
1524                         data->flags.unknown = 1;
1525
1526                 acpi_video_device_bind(video, data);
1527                 acpi_video_device_find_cap(data);
1528
1529                 status = acpi_install_notify_handler(device->handle,
1530                                                      ACPI_DEVICE_NOTIFY,
1531                                                      acpi_video_device_notify,
1532                                                      data);
1533                 if (ACPI_FAILURE(status)) {
1534                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1535                                           "Error installing notify handler\n"));
1536                         if(data->brightness)
1537                                 kfree(data->brightness->levels);
1538                         kfree(data->brightness);
1539                         kfree(data);
1540                         return -ENODEV;
1541                 }
1542
1543                 mutex_lock(&video->device_list_lock);
1544                 list_add_tail(&data->entry, &video->video_device_list);
1545                 mutex_unlock(&video->device_list_lock);
1546
1547                 acpi_video_device_add_fs(device);
1548
1549                 return 0;
1550         }
1551
1552         return -ENOENT;
1553 }
1554
1555 /*
1556  *  Arg:
1557  *      video   : video bus device
1558  *
1559  *  Return:
1560  *      none
1561  *
1562  *  Enumerate the video device list of the video bus,
1563  *  bind the ids with the corresponding video devices
1564  *  under the video bus.
1565  */
1566
1567 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1568 {
1569         struct acpi_video_device *dev;
1570
1571         mutex_lock(&video->device_list_lock);
1572
1573         list_for_each_entry(dev, &video->video_device_list, entry)
1574                 acpi_video_device_bind(video, dev);
1575
1576         mutex_unlock(&video->device_list_lock);
1577 }
1578
1579 /*
1580  *  Arg:
1581  *      video   : video bus device
1582  *      device  : video output device under the video
1583  *              bus
1584  *
1585  *  Return:
1586  *      none
1587  *
1588  *  Bind the ids with the corresponding video devices
1589  *  under the video bus.
1590  */
1591
1592 static void
1593 acpi_video_device_bind(struct acpi_video_bus *video,
1594                        struct acpi_video_device *device)
1595 {
1596         int i;
1597
1598 #define IDS_VAL(i) video->attached_array[i].value.int_val
1599 #define IDS_BIND(i) video->attached_array[i].bind_info
1600
1601         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1602              i < video->attached_count; i++) {
1603                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1604                         IDS_BIND(i) = device;
1605                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1606                 }
1607         }
1608 #undef IDS_VAL
1609 #undef IDS_BIND
1610 }
1611
1612 /*
1613  *  Arg:
1614  *      video   : video bus device
1615  *
1616  *  Return:
1617  *      < 0     : error
1618  *
1619  *  Call _DOD to enumerate all devices attached to display adapter
1620  *
1621  */
1622
1623 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1624 {
1625         int status;
1626         int count;
1627         int i;
1628         struct acpi_video_enumerated_device *active_device_list;
1629         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1630         union acpi_object *dod = NULL;
1631         union acpi_object *obj;
1632
1633         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1634         if (!ACPI_SUCCESS(status)) {
1635                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1636                 return status;
1637         }
1638
1639         dod = buffer.pointer;
1640         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1641                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1642                 status = -EFAULT;
1643                 goto out;
1644         }
1645
1646         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1647                           dod->package.count));
1648
1649         active_device_list = kmalloc((1 +
1650                                       dod->package.count) *
1651                                      sizeof(struct
1652                                             acpi_video_enumerated_device),
1653                                      GFP_KERNEL);
1654
1655         if (!active_device_list) {
1656                 status = -ENOMEM;
1657                 goto out;
1658         }
1659
1660         count = 0;
1661         for (i = 0; i < dod->package.count; i++) {
1662                 obj = &dod->package.elements[i];
1663
1664                 if (obj->type != ACPI_TYPE_INTEGER) {
1665                         printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1666                         active_device_list[i].value.int_val =
1667                             ACPI_VIDEO_HEAD_INVALID;
1668                 }
1669                 active_device_list[i].value.int_val = obj->integer.value;
1670                 active_device_list[i].bind_info = NULL;
1671                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1672                                   (int)obj->integer.value));
1673                 count++;
1674         }
1675         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1676
1677         kfree(video->attached_array);
1678
1679         video->attached_array = active_device_list;
1680         video->attached_count = count;
1681       out:
1682         kfree(buffer.pointer);
1683         return status;
1684 }
1685
1686 /*
1687  *  Arg:
1688  *      video   : video bus device
1689  *      event   : notify event
1690  *
1691  *  Return:
1692  *      < 0     : error
1693  *
1694  *      1. Find out the current active output device.
1695  *      2. Identify the next output device to switch to.
1696  *      3. call _DSS to do actual switch.
1697  */
1698
1699 static int acpi_video_switch_output(struct acpi_video_bus *video, int event)
1700 {
1701         struct list_head *node;
1702         struct acpi_video_device *dev = NULL;
1703         struct acpi_video_device *dev_next = NULL;
1704         struct acpi_video_device *dev_prev = NULL;
1705         unsigned long state;
1706         int status = 0;
1707
1708         mutex_lock(&video->device_list_lock);
1709
1710         list_for_each(node, &video->video_device_list) {
1711                 dev = container_of(node, struct acpi_video_device, entry);
1712                 status = acpi_video_device_get_state(dev, &state);
1713                 if (state & 0x2) {
1714                         dev_next = container_of(node->next,
1715                                         struct acpi_video_device, entry);
1716                         dev_prev = container_of(node->prev,
1717                                         struct acpi_video_device, entry);
1718                         goto out;
1719                 }
1720         }
1721
1722         dev_next = container_of(node->next, struct acpi_video_device, entry);
1723         dev_prev = container_of(node->prev, struct acpi_video_device, entry);
1724
1725  out:
1726         mutex_unlock(&video->device_list_lock);
1727
1728         switch (event) {
1729         case ACPI_VIDEO_NOTIFY_CYCLE:
1730         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:
1731                 acpi_video_device_set_state(dev, 0);
1732                 acpi_video_device_set_state(dev_next, 0x80000001);
1733                 break;
1734         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:
1735                 acpi_video_device_set_state(dev, 0);
1736                 acpi_video_device_set_state(dev_prev, 0x80000001);
1737         default:
1738                 break;
1739         }
1740
1741         return status;
1742 }
1743
1744 static int
1745 acpi_video_get_next_level(struct acpi_video_device *device,
1746                           u32 level_current, u32 event)
1747 {
1748         int min, max, min_above, max_below, i, l, delta = 255;
1749         max = max_below = 0;
1750         min = min_above = 255;
1751         /* Find closest level to level_current */
1752         for (i = 0; i < device->brightness->count; i++) {
1753                 l = device->brightness->levels[i];
1754                 if (abs(l - level_current) < abs(delta)) {
1755                         delta = l - level_current;
1756                         if (!delta)
1757                                 break;
1758                 }
1759         }
1760         /* Ajust level_current to closest available level */
1761         level_current += delta;
1762         for (i = 0; i < device->brightness->count; i++) {
1763                 l = device->brightness->levels[i];
1764                 if (l < min)
1765                         min = l;
1766                 if (l > max)
1767                         max = l;
1768                 if (l < min_above && l > level_current)
1769                         min_above = l;
1770                 if (l > max_below && l < level_current)
1771                         max_below = l;
1772         }
1773
1774         switch (event) {
1775         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1776                 return (level_current < max) ? min_above : min;
1777         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1778                 return (level_current < max) ? min_above : max;
1779         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1780                 return (level_current > min) ? max_below : min;
1781         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1782         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1783                 return 0;
1784         default:
1785                 return level_current;
1786         }
1787 }
1788
1789 static void
1790 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1791 {
1792         unsigned long level_current, level_next;
1793         acpi_video_device_lcd_get_level_current(device, &level_current);
1794         level_next = acpi_video_get_next_level(device, level_current, event);
1795         acpi_video_device_lcd_set_level(device, level_next);
1796 }
1797
1798 static int
1799 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1800                            struct acpi_device *device)
1801 {
1802         int status = 0;
1803         struct acpi_device *dev;
1804
1805         acpi_video_device_enumerate(video);
1806
1807         list_for_each_entry(dev, &device->children, node) {
1808
1809                 status = acpi_video_bus_get_one_device(dev, video);
1810                 if (ACPI_FAILURE(status)) {
1811                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1812                         continue;
1813                 }
1814         }
1815         return status;
1816 }
1817
1818 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1819 {
1820         acpi_status status;
1821         struct acpi_video_bus *video;
1822
1823
1824         if (!device || !device->video)
1825                 return -ENOENT;
1826
1827         video = device->video;
1828
1829         acpi_video_device_remove_fs(device->dev);
1830
1831         status = acpi_remove_notify_handler(device->dev->handle,
1832                                             ACPI_DEVICE_NOTIFY,
1833                                             acpi_video_device_notify);
1834         backlight_device_unregister(device->backlight);
1835         if (device->cdev) {
1836                 sysfs_remove_link(&device->dev->dev.kobj,
1837                                   "thermal_cooling");
1838                 sysfs_remove_link(&device->cdev->device.kobj,
1839                                   "device");
1840                 thermal_cooling_device_unregister(device->cdev);
1841                 device->cdev = NULL;
1842         }
1843         video_output_unregister(device->output_dev);
1844
1845         return 0;
1846 }
1847
1848 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1849 {
1850         int status;
1851         struct acpi_video_device *dev, *next;
1852
1853         mutex_lock(&video->device_list_lock);
1854
1855         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1856
1857                 status = acpi_video_bus_put_one_device(dev);
1858                 if (ACPI_FAILURE(status))
1859                         printk(KERN_WARNING PREFIX
1860                                "hhuuhhuu bug in acpi video driver.\n");
1861
1862                 if (dev->brightness) {
1863                         kfree(dev->brightness->levels);
1864                         kfree(dev->brightness);
1865                 }
1866                 list_del(&dev->entry);
1867                 kfree(dev);
1868         }
1869
1870         mutex_unlock(&video->device_list_lock);
1871
1872         return 0;
1873 }
1874
1875 /* acpi_video interface */
1876
1877 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1878 {
1879         return acpi_video_bus_DOS(video, 0, 0);
1880 }
1881
1882 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1883 {
1884         return acpi_video_bus_DOS(video, 0, 1);
1885 }
1886
1887 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1888 {
1889         struct acpi_video_bus *video = data;
1890         struct acpi_device *device = NULL;
1891         struct input_dev *input;
1892         int keycode;
1893
1894         if (!video)
1895                 return;
1896
1897         device = video->device;
1898         input = video->input;
1899
1900         switch (event) {
1901         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1902                                          * most likely via hotkey. */
1903                 acpi_bus_generate_proc_event(device, event, 0);
1904                 keycode = KEY_SWITCHVIDEOMODE;
1905                 break;
1906
1907         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1908                                          * connector. */
1909                 acpi_video_device_enumerate(video);
1910                 acpi_video_device_rebind(video);
1911                 acpi_video_switch_output(video, event);
1912                 acpi_bus_generate_proc_event(device, event, 0);
1913                 keycode = KEY_SWITCHVIDEOMODE;
1914                 break;
1915
1916         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1917                 acpi_video_switch_output(video, event);
1918                 acpi_bus_generate_proc_event(device, event, 0);
1919                 keycode = KEY_SWITCHVIDEOMODE;
1920                 break;
1921         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1922                 acpi_video_switch_output(video, event);
1923                 acpi_bus_generate_proc_event(device, event, 0);
1924                 keycode = KEY_VIDEO_NEXT;
1925                 break;
1926         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1927                 acpi_video_switch_output(video, event);
1928                 acpi_bus_generate_proc_event(device, event, 0);
1929                 keycode = KEY_VIDEO_PREV;
1930                 break;
1931
1932         default:
1933                 keycode = KEY_UNKNOWN;
1934                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1935                                   "Unsupported event [0x%x]\n", event));
1936                 break;
1937         }
1938
1939         input_report_key(input, keycode, 1);
1940         input_sync(input);
1941         input_report_key(input, keycode, 0);
1942         input_sync(input);
1943
1944         return;
1945 }
1946
1947 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1948 {
1949         struct acpi_video_device *video_device = data;
1950         struct acpi_device *device = NULL;
1951         struct acpi_video_bus *bus;
1952         struct input_dev *input;
1953         int keycode;
1954
1955         if (!video_device)
1956                 return;
1957
1958         device = video_device->dev;
1959         bus = video_device->video;
1960         input = bus->input;
1961
1962         switch (event) {
1963         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1964                 acpi_video_switch_brightness(video_device, event);
1965                 acpi_bus_generate_proc_event(device, event, 0);
1966                 keycode = KEY_BRIGHTNESS_CYCLE;
1967                 break;
1968         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1969                 acpi_video_switch_brightness(video_device, event);
1970                 acpi_bus_generate_proc_event(device, event, 0);
1971                 keycode = KEY_BRIGHTNESSUP;
1972                 break;
1973         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1974                 acpi_video_switch_brightness(video_device, event);
1975                 acpi_bus_generate_proc_event(device, event, 0);
1976                 keycode = KEY_BRIGHTNESSDOWN;
1977                 break;
1978         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1979                 acpi_video_switch_brightness(video_device, event);
1980                 acpi_bus_generate_proc_event(device, event, 0);
1981                 keycode = KEY_BRIGHTNESS_ZERO;
1982                 break;
1983         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1984                 acpi_video_switch_brightness(video_device, event);
1985                 acpi_bus_generate_proc_event(device, event, 0);
1986                 keycode = KEY_DISPLAY_OFF;
1987                 break;
1988         default:
1989                 keycode = KEY_UNKNOWN;
1990                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1991                                   "Unsupported event [0x%x]\n", event));
1992                 break;
1993         }
1994
1995         input_report_key(input, keycode, 1);
1996         input_sync(input);
1997         input_report_key(input, keycode, 0);
1998         input_sync(input);
1999
2000         return;
2001 }
2002
2003 static int instance;
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);