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 (device->cdev) {
 735                         printk(KERN_INFO PREFIX
 736                                 "%s is registered as cooling_device%d\n",
 737                                 device->dev->dev.bus_id, device->cdev->id);
 738                         result = sysfs_create_link(&device->dev->dev.kobj,
 739                                           &device->cdev->device.kobj,
 740                                           "thermal_cooling");
 741                         if (result)
 742                                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 743                         result = sysfs_create_link(&device->cdev->device.kobj,
 744                                           &device->dev->dev.kobj,
 745                                           "device");
 746                         if (result)
 747                                 printk(KERN_ERR PREFIX "Create sysfs link\n");
 748                 }
 749         }
 750         if (device->cap._DCS && device->cap._DSS){
 751                 static int count = 0;
 752                 char *name;
 753                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 754                 if (!name)
 755                         return;
 756                 sprintf(name, "acpi_video%d", count++);
 757                 device->output_dev = video_output_register(name,
 758                                 NULL, device, &acpi_output_properties);
 759                 kfree(name);
 760         }
 761         return;
 762 }
 763
 764 /*
 765  *  Arg:
 766  *      device  : video output device (VGA)
 767  *
 768  *  Return Value:
 769  *      None
 770  *
 771  *  Find out all required AML methods defined under the video bus device.
 772  */
 773
 774 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 775 {
 776         acpi_handle h_dummy1;
 777
 778         memset(&video->cap, 0, sizeof(video->cap));
 779         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 780                 video->cap._DOS = 1;
 781         }
 782         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 783                 video->cap._DOD = 1;
 784         }
 785         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 786                 video->cap._ROM = 1;
 787         }
 788         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 789                 video->cap._GPD = 1;
 790         }
 791         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 792                 video->cap._SPD = 1;
 793         }
 794         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 795                 video->cap._VPO = 1;
 796         }
 797 }
 798
 799 /*
 800  * Check whether the video bus device has required AML method to
 801  * support the desired features
 802  */
 803
 804 static int acpi_video_bus_check(struct acpi_video_bus *video)
 805 {
 806         acpi_status status = -ENOENT;
 807         long device_id;
 808         struct device *dev;
 809         struct acpi_device *device;
 810
 811         if (!video)
 812                 return -EINVAL;
 813
 814         device = video->device;
 815
 816         status =
 817             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
 818
 819         if (!ACPI_SUCCESS(status))
 820                 return -ENODEV;
 821
 822         /* We need to attempt to determine whether the _ADR refers to a
 823            PCI device or not. There's no terribly good way to do this,
 824            so the best we can hope for is to assume that there'll never
 825            be a video device in the host bridge */
 826         if (device_id >= 0x10000) {
 827                 /* It looks like a PCI device. Does it exist? */
 828                 dev = acpi_get_physical_device(device->handle);
 829         } else {
 830                 /* It doesn't look like a PCI device. Does its parent
 831                    exist? */
 832                 acpi_handle phandle;
 833                 if (acpi_get_parent(device->handle, &phandle))
 834                         return -ENODEV;
 835                 dev = acpi_get_physical_device(phandle);
 836         }
 837         if (!dev)
 838                 return -ENODEV;
 839         put_device(dev);
 840
 841         /* Since there is no HID, CID and so on for VGA driver, we have
 842          * to check well known required nodes.
 843          */
 844
 845         /* Does this device support video switching? */
 846         if (video->cap._DOS) {
 847                 video->flags.multihead = 1;
 848                 status = 0;
 849         }
 850
 851         /* Does this device support retrieving a video ROM? */
 852         if (video->cap._ROM) {
 853                 video->flags.rom = 1;
 854                 status = 0;
 855         }
 856
 857         /* Does this device support configuring which video device to POST? */
 858         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 859                 video->flags.post = 1;
 860                 status = 0;
 861         }
 862
 863         return status;
 864 }
 865
 866 /* --------------------------------------------------------------------------
 867                               FS Interface (/proc)
 868    -------------------------------------------------------------------------- */
 869
 870 static struct proc_dir_entry *acpi_video_dir;
 871
 872 /* video devices */
 873
 874 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 875 {
 876         struct acpi_video_device *dev = seq->private;
 877
 878
 879         if (!dev)
 880                 goto end;
 881
 882         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 883         seq_printf(seq, "type:         ");
 884         if (dev->flags.crt)
 885                 seq_printf(seq, "CRT\n");
 886         else if (dev->flags.lcd)
 887                 seq_printf(seq, "LCD\n");
 888         else if (dev->flags.tvout)
 889                 seq_printf(seq, "TVOUT\n");
 890         else if (dev->flags.dvi)
 891                 seq_printf(seq, "DVI\n");
 892         else
 893                 seq_printf(seq, "UNKNOWN\n");
 894
 895         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 896
 897       end:
 898         return 0;
 899 }
 900
 901 static int
 902 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 903 {
 904         return single_open(file, acpi_video_device_info_seq_show,
 905                            PDE(inode)->data);
 906 }
 907
 908 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 909 {
 910         int status;
 911         struct acpi_video_device *dev = seq->private;
 912         unsigned long state;
 913
 914
 915         if (!dev)
 916                 goto end;
 917
 918         status = acpi_video_device_get_state(dev, &state);
 919         seq_printf(seq, "state:     ");
 920         if (ACPI_SUCCESS(status))
 921                 seq_printf(seq, "0x%02lx\n", state);
 922         else
 923                 seq_printf(seq, "<not supported>\n");
 924
 925         status = acpi_video_device_query(dev, &state);
 926         seq_printf(seq, "query:     ");
 927         if (ACPI_SUCCESS(status))
 928                 seq_printf(seq, "0x%02lx\n", state);
 929         else
 930                 seq_printf(seq, "<not supported>\n");
 931
 932       end:
 933         return 0;
 934 }
 935
 936 static int
 937 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 938 {
 939         return single_open(file, acpi_video_device_state_seq_show,
 940                            PDE(inode)->data);
 941 }
 942
 943 static ssize_t
 944 acpi_video_device_write_state(struct file *file,
 945                               const char __user * buffer,
 946                               size_t count, loff_t * data)
 947 {
 948         int status;
 949         struct seq_file *m = file->private_data;
 950         struct acpi_video_device *dev = m->private;
 951         char str[12] = { 0 };
 952         u32 state = 0;
 953
 954
 955         if (!dev || count + 1 > sizeof str)
 956                 return -EINVAL;
 957
 958         if (copy_from_user(str, buffer, count))
 959                 return -EFAULT;
 960
 961         str[count] = 0;
 962         state = simple_strtoul(str, NULL, 0);
 963         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
 964
 965         status = acpi_video_device_set_state(dev, state);
 966
 967         if (status)
 968                 return -EFAULT;
 969
 970         return count;
 971 }
 972
 973 static int
 974 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
 975 {
 976         struct acpi_video_device *dev = seq->private;
 977         int i;
 978
 979
 980         if (!dev || !dev->brightness) {
 981                 seq_printf(seq, "<not supported>\n");
 982                 return 0;
 983         }
 984
 985         seq_printf(seq, "levels: ");
 986         for (i = 0; i < dev->brightness->count; i++)
 987                 seq_printf(seq, " %d", dev->brightness->levels[i]);
 988         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
 989
 990         return 0;
 991 }
 992
 993 static int
 994 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
 995 {
 996         return single_open(file, acpi_video_device_brightness_seq_show,
 997                            PDE(inode)->data);
 998 }
 999
1000 static ssize_t
1001 acpi_video_device_write_brightness(struct file *file,
1002                                    const char __user * buffer,
1003                                    size_t count, loff_t * data)
1004 {
1005         struct seq_file *m = file->private_data;
1006         struct acpi_video_device *dev = m->private;
1007         char str[5] = { 0 };
1008         unsigned int level = 0;
1009         int i;
1010
1011
1012         if (!dev || !dev->brightness || count + 1 > sizeof str)
1013                 return -EINVAL;
1014
1015         if (copy_from_user(str, buffer, count))
1016                 return -EFAULT;
1017
1018         str[count] = 0;
1019         level = simple_strtoul(str, NULL, 0);
1020
1021         if (level > 100)
1022                 return -EFAULT;
1023
1024         /* validate through the list of available levels */
1025         for (i = 0; i < dev->brightness->count; i++)
1026                 if (level == dev->brightness->levels[i]) {
1027                         if (ACPI_SUCCESS
1028                             (acpi_video_device_lcd_set_level(dev, level)))
1029                                 dev->brightness->curr = level;
1030                         break;
1031                 }
1032
1033         return count;
1034 }
1035
1036 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1037 {
1038         struct acpi_video_device *dev = seq->private;
1039         int status;
1040         int i;
1041         union acpi_object *edid = NULL;
1042
1043
1044         if (!dev)
1045                 goto out;
1046
1047         status = acpi_video_device_EDID(dev, &edid, 128);
1048         if (ACPI_FAILURE(status)) {
1049                 status = acpi_video_device_EDID(dev, &edid, 256);
1050         }
1051
1052         if (ACPI_FAILURE(status)) {
1053                 goto out;
1054         }
1055
1056         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1057                 for (i = 0; i < edid->buffer.length; i++)
1058                         seq_putc(seq, edid->buffer.pointer[i]);
1059         }
1060
1061       out:
1062         if (!edid)
1063                 seq_printf(seq, "<not supported>\n");
1064         else
1065                 kfree(edid);
1066
1067         return 0;
1068 }
1069
1070 static int
1071 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1072 {
1073         return single_open(file, acpi_video_device_EDID_seq_show,
1074                            PDE(inode)->data);
1075 }
1076
1077 static int acpi_video_device_add_fs(struct acpi_device *device)
1078 {
1079         struct proc_dir_entry *entry = NULL;
1080         struct acpi_video_device *vid_dev;
1081
1082
1083         if (!device)
1084                 return -ENODEV;
1085
1086         vid_dev = acpi_driver_data(device);
1087         if (!vid_dev)
1088                 return -ENODEV;
1089
1090         if (!acpi_device_dir(device)) {
1091                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1092                                                      vid_dev->video->dir);
1093                 if (!acpi_device_dir(device))
1094                         return -ENODEV;
1095                 acpi_device_dir(device)->owner = THIS_MODULE;
1096         }
1097
1098         /* 'info' [R] */
1099         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1100         if (!entry)
1101                 return -ENODEV;
1102         else {
1103                 entry->proc_fops = &acpi_video_device_info_fops;
1104                 entry->data = acpi_driver_data(device);
1105                 entry->owner = THIS_MODULE;
1106         }
1107
1108         /* 'state' [R/W] */
1109         entry =
1110             create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
1111                               acpi_device_dir(device));
1112         if (!entry)
1113                 return -ENODEV;
1114         else {
1115                 acpi_video_device_state_fops.write = acpi_video_device_write_state;
1116                 entry->proc_fops = &acpi_video_device_state_fops;
1117                 entry->data = acpi_driver_data(device);
1118                 entry->owner = THIS_MODULE;
1119         }
1120
1121         /* 'brightness' [R/W] */
1122         entry =
1123             create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1124                               acpi_device_dir(device));
1125         if (!entry)
1126                 return -ENODEV;
1127         else {
1128                 acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
1129                 entry->proc_fops = &acpi_video_device_brightness_fops;
1130                 entry->data = acpi_driver_data(device);
1131                 entry->owner = THIS_MODULE;
1132         }
1133
1134         /* 'EDID' [R] */
1135         entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
1136         if (!entry)
1137                 return -ENODEV;
1138         else {
1139                 entry->proc_fops = &acpi_video_device_EDID_fops;
1140                 entry->data = acpi_driver_data(device);
1141                 entry->owner = THIS_MODULE;
1142         }
1143
1144         return 0;
1145 }
1146
1147 static int acpi_video_device_remove_fs(struct acpi_device *device)
1148 {
1149         struct acpi_video_device *vid_dev;
1150
1151         vid_dev = acpi_driver_data(device);
1152         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1153                 return -ENODEV;
1154
1155         if (acpi_device_dir(device)) {
1156                 remove_proc_entry("info", acpi_device_dir(device));
1157                 remove_proc_entry("state", acpi_device_dir(device));
1158                 remove_proc_entry("brightness", acpi_device_dir(device));
1159                 remove_proc_entry("EDID", acpi_device_dir(device));
1160                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1161                 acpi_device_dir(device) = NULL;
1162         }
1163
1164         return 0;
1165 }
1166
1167 /* video bus */
1168 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1169 {
1170         struct acpi_video_bus *video = seq->private;
1171
1172
1173         if (!video)
1174                 goto end;
1175
1176         seq_printf(seq, "Switching heads:              %s\n",
1177                    video->flags.multihead ? "yes" : "no");
1178         seq_printf(seq, "Video ROM:                    %s\n",
1179                    video->flags.rom ? "yes" : "no");
1180         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1181                    video->flags.post ? "yes" : "no");
1182
1183       end:
1184         return 0;
1185 }
1186
1187 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1188 {
1189         return single_open(file, acpi_video_bus_info_seq_show,
1190                            PDE(inode)->data);
1191 }
1192
1193 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1194 {
1195         struct acpi_video_bus *video = seq->private;
1196
1197
1198         if (!video)
1199                 goto end;
1200
1201         printk(KERN_INFO PREFIX "Please implement %s\n", __FUNCTION__);
1202         seq_printf(seq, "<TODO>\n");
1203
1204       end:
1205         return 0;
1206 }
1207
1208 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1209 {
1210         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1211 }
1212
1213 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1214 {
1215         struct acpi_video_bus *video = seq->private;
1216         unsigned long options;
1217         int status;
1218
1219
1220         if (!video)
1221                 goto end;
1222
1223         status = acpi_video_bus_POST_options(video, &options);
1224         if (ACPI_SUCCESS(status)) {
1225                 if (!(options & 1)) {
1226                         printk(KERN_WARNING PREFIX
1227                                "The motherboard VGA device is not listed as a possible POST device.\n");
1228                         printk(KERN_WARNING PREFIX
1229                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1230                 }
1231                 printk("%lx\n", options);
1232                 seq_printf(seq, "can POST: <integrated video>");
1233                 if (options & 2)
1234                         seq_printf(seq, " <PCI video>");
1235                 if (options & 4)
1236                         seq_printf(seq, " <AGP video>");
1237                 seq_putc(seq, '\n');
1238         } else
1239                 seq_printf(seq, "<not supported>\n");
1240       end:
1241         return 0;
1242 }
1243
1244 static int
1245 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1246 {
1247         return single_open(file, acpi_video_bus_POST_info_seq_show,
1248                            PDE(inode)->data);
1249 }
1250
1251 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1252 {
1253         struct acpi_video_bus *video = seq->private;
1254         int status;
1255         unsigned long id;
1256
1257
1258         if (!video)
1259                 goto end;
1260
1261         status = acpi_video_bus_get_POST(video, &id);
1262         if (!ACPI_SUCCESS(status)) {
1263                 seq_printf(seq, "<not supported>\n");
1264                 goto end;
1265         }
1266         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1267
1268       end:
1269         return 0;
1270 }
1271
1272 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1273 {
1274         struct acpi_video_bus *video = seq->private;
1275
1276
1277         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1278
1279         return 0;
1280 }
1281
1282 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1283 {
1284         return single_open(file, acpi_video_bus_POST_seq_show,
1285                            PDE(inode)->data);
1286 }
1287
1288 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1289 {
1290         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1291 }
1292
1293 static ssize_t
1294 acpi_video_bus_write_POST(struct file *file,
1295                           const char __user * buffer,
1296                           size_t count, loff_t * data)
1297 {
1298         int status;
1299         struct seq_file *m = file->private_data;
1300         struct acpi_video_bus *video = m->private;
1301         char str[12] = { 0 };
1302         unsigned long opt, options;
1303
1304
1305         if (!video || count + 1 > sizeof str)
1306                 return -EINVAL;
1307
1308         status = acpi_video_bus_POST_options(video, &options);
1309         if (!ACPI_SUCCESS(status))
1310                 return -EINVAL;
1311
1312         if (copy_from_user(str, buffer, count))
1313                 return -EFAULT;
1314
1315         str[count] = 0;
1316         opt = strtoul(str, NULL, 0);
1317         if (opt > 3)
1318                 return -EFAULT;
1319
1320         /* just in case an OEM 'forgot' the motherboard... */
1321         options |= 1;
1322
1323         if (options & (1ul << opt)) {
1324                 status = acpi_video_bus_set_POST(video, opt);
1325                 if (!ACPI_SUCCESS(status))
1326                         return -EFAULT;
1327
1328         }
1329
1330         return count;
1331 }
1332
1333 static ssize_t
1334 acpi_video_bus_write_DOS(struct file *file,
1335                          const char __user * buffer,
1336                          size_t count, loff_t * data)
1337 {
1338         int status;
1339         struct seq_file *m = file->private_data;
1340         struct acpi_video_bus *video = m->private;
1341         char str[12] = { 0 };
1342         unsigned long opt;
1343
1344
1345         if (!video || count + 1 > sizeof str)
1346                 return -EINVAL;
1347
1348         if (copy_from_user(str, buffer, count))
1349                 return -EFAULT;
1350
1351         str[count] = 0;
1352         opt = strtoul(str, NULL, 0);
1353         if (opt > 7)
1354                 return -EFAULT;
1355
1356         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1357
1358         if (!ACPI_SUCCESS(status))
1359                 return -EFAULT;
1360
1361         return count;
1362 }
1363
1364 static int acpi_video_bus_add_fs(struct acpi_device *device)
1365 {
1366         long device_id;
1367         int status;
1368         struct proc_dir_entry *entry = NULL;
1369         struct acpi_video_bus *video;
1370         struct device *dev;
1371
1372         status =
1373             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1374
1375         if (!ACPI_SUCCESS(status))
1376                 return -ENODEV;
1377
1378         /* We need to attempt to determine whether the _ADR refers to a
1379            PCI device or not. There's no terribly good way to do this,
1380            so the best we can hope for is to assume that there'll never
1381            be a video device in the host bridge */
1382         if (device_id >= 0x10000) {
1383                 /* It looks like a PCI device. Does it exist? */
1384                 dev = acpi_get_physical_device(device->handle);
1385         } else {
1386                 /* It doesn't look like a PCI device. Does its parent
1387                    exist? */
1388                 acpi_handle phandle;
1389                 if (acpi_get_parent(device->handle, &phandle))
1390                         return -ENODEV;
1391                 dev = acpi_get_physical_device(phandle);
1392         }
1393         if (!dev)
1394                 return -ENODEV;
1395         put_device(dev);
1396
1397
1398
1399         video = acpi_driver_data(device);
1400
1401         if (!acpi_device_dir(device)) {
1402                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1403                                                      acpi_video_dir);
1404                 if (!acpi_device_dir(device))
1405                         return -ENODEV;
1406                 video->dir = acpi_device_dir(device);
1407                 acpi_device_dir(device)->owner = THIS_MODULE;
1408         }
1409
1410         /* 'info' [R] */
1411         entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
1412         if (!entry)
1413                 return -ENODEV;
1414         else {
1415                 entry->proc_fops = &acpi_video_bus_info_fops;
1416                 entry->data = acpi_driver_data(device);
1417                 entry->owner = THIS_MODULE;
1418         }
1419
1420         /* 'ROM' [R] */
1421         entry = create_proc_entry("ROM", S_IRUGO, acpi_device_dir(device));
1422         if (!entry)
1423                 return -ENODEV;
1424         else {
1425                 entry->proc_fops = &acpi_video_bus_ROM_fops;
1426                 entry->data = acpi_driver_data(device);
1427                 entry->owner = THIS_MODULE;
1428         }
1429
1430         /* 'POST_info' [R] */
1431         entry =
1432             create_proc_entry("POST_info", S_IRUGO, acpi_device_dir(device));
1433         if (!entry)
1434                 return -ENODEV;
1435         else {
1436                 entry->proc_fops = &acpi_video_bus_POST_info_fops;
1437                 entry->data = acpi_driver_data(device);
1438                 entry->owner = THIS_MODULE;
1439         }
1440
1441         /* 'POST' [R/W] */
1442         entry =
1443             create_proc_entry("POST", S_IFREG | S_IRUGO | S_IRUSR,
1444                               acpi_device_dir(device));
1445         if (!entry)
1446                 return -ENODEV;
1447         else {
1448                 acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1449                 entry->proc_fops = &acpi_video_bus_POST_fops;
1450                 entry->data = acpi_driver_data(device);
1451                 entry->owner = THIS_MODULE;
1452         }
1453
1454         /* 'DOS' [R/W] */
1455         entry =
1456             create_proc_entry("DOS", S_IFREG | S_IRUGO | S_IRUSR,
1457                               acpi_device_dir(device));
1458         if (!entry)
1459                 return -ENODEV;
1460         else {
1461                 acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1462                 entry->proc_fops = &acpi_video_bus_DOS_fops;
1463                 entry->data = acpi_driver_data(device);
1464                 entry->owner = THIS_MODULE;
1465         }
1466
1467         return 0;
1468 }
1469
1470 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1471 {
1472         struct acpi_video_bus *video;
1473
1474
1475         video = acpi_driver_data(device);
1476
1477         if (acpi_device_dir(device)) {
1478                 remove_proc_entry("info", acpi_device_dir(device));
1479                 remove_proc_entry("ROM", acpi_device_dir(device));
1480                 remove_proc_entry("POST_info", acpi_device_dir(device));
1481                 remove_proc_entry("POST", acpi_device_dir(device));
1482                 remove_proc_entry("DOS", acpi_device_dir(device));
1483                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1484                 acpi_device_dir(device) = NULL;
1485         }
1486
1487         return 0;
1488 }
1489
1490 /* --------------------------------------------------------------------------
1491                                  Driver Interface
1492    -------------------------------------------------------------------------- */
1493
1494 /* device interface */
1495 static struct acpi_video_device_attrib*
1496 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1497 {
1498         int count;
1499
1500         for(count = 0; count < video->attached_count; count++)
1501                 if((video->attached_array[count].value.int_val & 0xffff) == device_id)
1502                         return &(video->attached_array[count].value.attrib);
1503         return NULL;
1504 }
1505
1506 static int
1507 acpi_video_bus_get_one_device(struct acpi_device *device,
1508                               struct acpi_video_bus *video)
1509 {
1510         unsigned long device_id;
1511         int status;
1512         struct acpi_video_device *data;
1513         struct acpi_video_device_attrib* attribute;
1514
1515         if (!device || !video)
1516                 return -EINVAL;
1517
1518         status =
1519             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1520         if (ACPI_SUCCESS(status)) {
1521
1522                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1523                 if (!data)
1524                         return -ENOMEM;
1525
1526                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1527                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1528                 acpi_driver_data(device) = data;
1529
1530                 data->device_id = device_id;
1531                 data->video = video;
1532                 data->dev = device;
1533
1534                 attribute = acpi_video_get_device_attr(video, device_id);
1535
1536                 if((attribute != NULL) && attribute->device_id_scheme) {
1537                         switch (attribute->display_type) {
1538                         case ACPI_VIDEO_DISPLAY_CRT:
1539                                 data->flags.crt = 1;
1540                                 break;
1541                         case ACPI_VIDEO_DISPLAY_TV:
1542                                 data->flags.tvout = 1;
1543                                 break;
1544                         case ACPI_VIDEO_DISPLAY_DVI:
1545                                 data->flags.dvi = 1;
1546                                 break;
1547                         case ACPI_VIDEO_DISPLAY_LCD:
1548                                 data->flags.lcd = 1;
1549                                 break;
1550                         default:
1551                                 data->flags.unknown = 1;
1552                                 break;
1553                         }
1554                         if(attribute->bios_can_detect)
1555                                 data->flags.bios = 1;
1556                 } else
1557                         data->flags.unknown = 1;
1558
1559                 acpi_video_device_bind(video, data);
1560                 acpi_video_device_find_cap(data);
1561
1562                 status = acpi_install_notify_handler(device->handle,
1563                                                      ACPI_DEVICE_NOTIFY,
1564                                                      acpi_video_device_notify,
1565                                                      data);
1566                 if (ACPI_FAILURE(status)) {
1567                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1568                                           "Error installing notify handler\n"));
1569                         if(data->brightness)
1570                                 kfree(data->brightness->levels);
1571                         kfree(data->brightness);
1572                         kfree(data);
1573                         return -ENODEV;
1574                 }
1575
1576                 mutex_lock(&video->device_list_lock);
1577                 list_add_tail(&data->entry, &video->video_device_list);
1578                 mutex_unlock(&video->device_list_lock);
1579
1580                 acpi_video_device_add_fs(device);
1581
1582                 return 0;
1583         }
1584
1585         return -ENOENT;
1586 }
1587
1588 /*
1589  *  Arg:
1590  *      video   : video bus device
1591  *
1592  *  Return:
1593  *      none
1594  *
1595  *  Enumerate the video device list of the video bus,
1596  *  bind the ids with the corresponding video devices
1597  *  under the video bus.
1598  */
1599
1600 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1601 {
1602         struct acpi_video_device *dev;
1603
1604         mutex_lock(&video->device_list_lock);
1605
1606         list_for_each_entry(dev, &video->video_device_list, entry)
1607                 acpi_video_device_bind(video, dev);
1608
1609         mutex_unlock(&video->device_list_lock);
1610 }
1611
1612 /*
1613  *  Arg:
1614  *      video   : video bus device
1615  *      device  : video output device under the video
1616  *              bus
1617  *
1618  *  Return:
1619  *      none
1620  *
1621  *  Bind the ids with the corresponding video devices
1622  *  under the video bus.
1623  */
1624
1625 static void
1626 acpi_video_device_bind(struct acpi_video_bus *video,
1627                        struct acpi_video_device *device)
1628 {
1629         int i;
1630
1631 #define IDS_VAL(i) video->attached_array[i].value.int_val
1632 #define IDS_BIND(i) video->attached_array[i].bind_info
1633
1634         for (i = 0; IDS_VAL(i) != ACPI_VIDEO_HEAD_INVALID &&
1635              i < video->attached_count; i++) {
1636                 if (device->device_id == (IDS_VAL(i) & 0xffff)) {
1637                         IDS_BIND(i) = device;
1638                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1639                 }
1640         }
1641 #undef IDS_VAL
1642 #undef IDS_BIND
1643 }
1644
1645 /*
1646  *  Arg:
1647  *      video   : video bus device
1648  *
1649  *  Return:
1650  *      < 0     : error
1651  *
1652  *  Call _DOD to enumerate all devices attached to display adapter
1653  *
1654  */
1655
1656 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1657 {
1658         int status;
1659         int count;
1660         int i;
1661         struct acpi_video_enumerated_device *active_device_list;
1662         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1663         union acpi_object *dod = NULL;
1664         union acpi_object *obj;
1665
1666         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1667         if (!ACPI_SUCCESS(status)) {
1668                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1669                 return status;
1670         }
1671
1672         dod = buffer.pointer;
1673         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1674                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1675                 status = -EFAULT;
1676                 goto out;
1677         }
1678
1679         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1680                           dod->package.count));
1681
1682         active_device_list = kmalloc((1 +
1683                                       dod->package.count) *
1684                                      sizeof(struct
1685                                             acpi_video_enumerated_device),
1686                                      GFP_KERNEL);
1687
1688         if (!active_device_list) {
1689                 status = -ENOMEM;
1690                 goto out;
1691         }
1692
1693         count = 0;
1694         for (i = 0; i < dod->package.count; i++) {
1695                 obj = &dod->package.elements[i];
1696
1697                 if (obj->type != ACPI_TYPE_INTEGER) {
1698                         printk(KERN_ERR PREFIX "Invalid _DOD data\n");
1699                         active_device_list[i].value.int_val =
1700                             ACPI_VIDEO_HEAD_INVALID;
1701                 }
1702                 active_device_list[i].value.int_val = obj->integer.value;
1703                 active_device_list[i].bind_info = NULL;
1704                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1705                                   (int)obj->integer.value));
1706                 count++;
1707         }
1708         active_device_list[count].value.int_val = ACPI_VIDEO_HEAD_END;
1709
1710         kfree(video->attached_array);
1711
1712         video->attached_array = active_device_list;
1713         video->attached_count = count;
1714       out:
1715         kfree(buffer.pointer);
1716         return status;
1717 }
1718
1719 static int
1720 acpi_video_get_next_level(struct acpi_video_device *device,
1721                           u32 level_current, u32 event)
1722 {
1723         int min, max, min_above, max_below, i, l, delta = 255;
1724         max = max_below = 0;
1725         min = min_above = 255;
1726         /* Find closest level to level_current */
1727         for (i = 0; i < device->brightness->count; i++) {
1728                 l = device->brightness->levels[i];
1729                 if (abs(l - level_current) < abs(delta)) {
1730                         delta = l - level_current;
1731                         if (!delta)
1732                                 break;
1733                 }
1734         }
1735         /* Ajust level_current to closest available level */
1736         level_current += delta;
1737         for (i = 0; i < device->brightness->count; i++) {
1738                 l = device->brightness->levels[i];
1739                 if (l < min)
1740                         min = l;
1741                 if (l > max)
1742                         max = l;
1743                 if (l < min_above && l > level_current)
1744                         min_above = l;
1745                 if (l > max_below && l < level_current)
1746                         max_below = l;
1747         }
1748
1749         switch (event) {
1750         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1751                 return (level_current < max) ? min_above : min;
1752         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1753                 return (level_current < max) ? min_above : max;
1754         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1755                 return (level_current > min) ? max_below : min;
1756         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1757         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1758                 return 0;
1759         default:
1760                 return level_current;
1761         }
1762 }
1763
1764 static void
1765 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1766 {
1767         unsigned long level_current, level_next;
1768         acpi_video_device_lcd_get_level_current(device, &level_current);
1769         level_next = acpi_video_get_next_level(device, level_current, event);
1770         acpi_video_device_lcd_set_level(device, level_next);
1771 }
1772
1773 static int
1774 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1775                            struct acpi_device *device)
1776 {
1777         int status = 0;
1778         struct acpi_device *dev;
1779
1780         acpi_video_device_enumerate(video);
1781
1782         list_for_each_entry(dev, &device->children, node) {
1783
1784                 status = acpi_video_bus_get_one_device(dev, video);
1785                 if (ACPI_FAILURE(status)) {
1786                         ACPI_EXCEPTION((AE_INFO, status, "Cant attach device"));
1787                         continue;
1788                 }
1789         }
1790         return status;
1791 }
1792
1793 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1794 {
1795         acpi_status status;
1796         struct acpi_video_bus *video;
1797
1798
1799         if (!device || !device->video)
1800                 return -ENOENT;
1801
1802         video = device->video;
1803
1804         acpi_video_device_remove_fs(device->dev);
1805
1806         status = acpi_remove_notify_handler(device->dev->handle,
1807                                             ACPI_DEVICE_NOTIFY,
1808                                             acpi_video_device_notify);
1809         backlight_device_unregister(device->backlight);
1810         if (device->cdev) {
1811                 sysfs_remove_link(&device->dev->dev.kobj,
1812                                   "thermal_cooling");
1813                 sysfs_remove_link(&device->cdev->device.kobj,
1814                                   "device");
1815                 thermal_cooling_device_unregister(device->cdev);
1816                 device->cdev = NULL;
1817         }
1818         video_output_unregister(device->output_dev);
1819
1820         return 0;
1821 }
1822
1823 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1824 {
1825         int status;
1826         struct acpi_video_device *dev, *next;
1827
1828         mutex_lock(&video->device_list_lock);
1829
1830         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1831
1832                 status = acpi_video_bus_put_one_device(dev);
1833                 if (ACPI_FAILURE(status))
1834                         printk(KERN_WARNING PREFIX
1835                                "hhuuhhuu bug in acpi video driver.\n");
1836
1837                 if (dev->brightness) {
1838                         kfree(dev->brightness->levels);
1839                         kfree(dev->brightness);
1840                 }
1841                 list_del(&dev->entry);
1842                 kfree(dev);
1843         }
1844
1845         mutex_unlock(&video->device_list_lock);
1846
1847         return 0;
1848 }
1849
1850 /* acpi_video interface */
1851
1852 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1853 {
1854         return acpi_video_bus_DOS(video, 0, 0);
1855 }
1856
1857 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1858 {
1859         return acpi_video_bus_DOS(video, 0, 1);
1860 }
1861
1862 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1863 {
1864         struct acpi_video_bus *video = data;
1865         struct acpi_device *device = NULL;
1866         struct input_dev *input;
1867         int keycode;
1868
1869         if (!video)
1870                 return;
1871
1872         device = video->device;
1873         input = video->input;
1874
1875         switch (event) {
1876         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1877                                          * most likely via hotkey. */
1878                 acpi_bus_generate_proc_event(device, event, 0);
1879                 keycode = KEY_SWITCHVIDEOMODE;
1880                 break;
1881
1882         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1883                                          * connector. */
1884                 acpi_video_device_enumerate(video);
1885                 acpi_video_device_rebind(video);
1886                 acpi_bus_generate_proc_event(device, event, 0);
1887                 keycode = KEY_SWITCHVIDEOMODE;
1888                 break;
1889
1890         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1891                 acpi_bus_generate_proc_event(device, event, 0);
1892                 keycode = KEY_SWITCHVIDEOMODE;
1893                 break;
1894         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1895                 acpi_bus_generate_proc_event(device, event, 0);
1896                 keycode = KEY_VIDEO_NEXT;
1897                 break;
1898         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1899                 acpi_bus_generate_proc_event(device, event, 0);
1900                 keycode = KEY_VIDEO_PREV;
1901                 break;
1902
1903         default:
1904                 keycode = KEY_UNKNOWN;
1905                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1906                                   "Unsupported event [0x%x]\n", event));
1907                 break;
1908         }
1909
1910         acpi_notifier_call_chain(device, event, 0);
1911         input_report_key(input, keycode, 1);
1912         input_sync(input);
1913         input_report_key(input, keycode, 0);
1914         input_sync(input);
1915
1916         return;
1917 }
1918
1919 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1920 {
1921         struct acpi_video_device *video_device = data;
1922         struct acpi_device *device = NULL;
1923         struct acpi_video_bus *bus;
1924         struct input_dev *input;
1925         int keycode;
1926
1927         if (!video_device)
1928                 return;
1929
1930         device = video_device->dev;
1931         bus = video_device->video;
1932         input = bus->input;
1933
1934         switch (event) {
1935         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1936                 if (brightness_switch_enabled)
1937                         acpi_video_switch_brightness(video_device, event);
1938                 acpi_bus_generate_proc_event(device, event, 0);
1939                 keycode = KEY_BRIGHTNESS_CYCLE;
1940                 break;
1941         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1942                 if (brightness_switch_enabled)
1943                         acpi_video_switch_brightness(video_device, event);
1944                 acpi_bus_generate_proc_event(device, event, 0);
1945                 keycode = KEY_BRIGHTNESSUP;
1946                 break;
1947         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1948                 if (brightness_switch_enabled)
1949                         acpi_video_switch_brightness(video_device, event);
1950                 acpi_bus_generate_proc_event(device, event, 0);
1951                 keycode = KEY_BRIGHTNESSDOWN;
1952                 break;
1953         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1954                 if (brightness_switch_enabled)
1955                         acpi_video_switch_brightness(video_device, event);
1956                 acpi_bus_generate_proc_event(device, event, 0);
1957                 keycode = KEY_BRIGHTNESS_ZERO;
1958                 break;
1959         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1960                 if (brightness_switch_enabled)
1961                         acpi_video_switch_brightness(video_device, event);
1962                 acpi_bus_generate_proc_event(device, event, 0);
1963                 keycode = KEY_DISPLAY_OFF;
1964                 break;
1965         default:
1966                 keycode = KEY_UNKNOWN;
1967                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1968                                   "Unsupported event [0x%x]\n", event));
1969                 break;
1970         }
1971
1972         acpi_notifier_call_chain(device, event, 0);
1973         input_report_key(input, keycode, 1);
1974         input_sync(input);
1975         input_report_key(input, keycode, 0);
1976         input_sync(input);
1977
1978         return;
1979 }
1980
1981 static int instance;
1982 static int acpi_video_resume(struct acpi_device *device)
1983 {
1984         struct acpi_video_bus *video;
1985         struct acpi_video_device *video_device;
1986         int i;
1987
1988         if (!device || !acpi_driver_data(device))
1989                 return -EINVAL;
1990
1991         video = acpi_driver_data(device);
1992
1993         for (i = 0; i < video->attached_count; i++) {
1994                 video_device = video->attached_array[i].bind_info;
1995                 if (video_device && video_device->backlight)
1996                         acpi_video_set_brightness(video_device->backlight);
1997         }
1998         return AE_OK;
1999 }
2000
2001 static int acpi_video_bus_add(struct acpi_device *device)
2002 {
2003         acpi_status status;
2004         struct acpi_video_bus *video;
2005         struct input_dev *input;
2006         int error;
2007
2008         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2009         if (!video)
2010                 return -ENOMEM;
2011
2012         /* a hack to fix the duplicate name "VID" problem on T61 */
2013         if (!strcmp(device->pnp.bus_id, "VID")) {
2014                 if (instance)
2015                         device->pnp.bus_id[3] = '0' + instance;
2016                 instance ++;
2017         }
2018
2019         video->device = device;
2020         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2021         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2022         acpi_driver_data(device) = video;
2023
2024         acpi_video_bus_find_cap(video);
2025         error = acpi_video_bus_check(video);
2026         if (error)
2027                 goto err_free_video;
2028
2029         error = acpi_video_bus_add_fs(device);
2030         if (error)
2031                 goto err_free_video;
2032
2033         mutex_init(&video->device_list_lock);
2034         INIT_LIST_HEAD(&video->video_device_list);
2035
2036         acpi_video_bus_get_devices(video, device);
2037         acpi_video_bus_start_devices(video);
2038
2039         status = acpi_install_notify_handler(device->handle,
2040                                              ACPI_DEVICE_NOTIFY,
2041                                              acpi_video_bus_notify, video);
2042         if (ACPI_FAILURE(status)) {
2043                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
2044                                   "Error installing notify handler\n"));
2045                 error = -ENODEV;
2046                 goto err_stop_video;
2047         }
2048
2049         video->input = input = input_allocate_device();
2050         if (!input) {
2051                 error = -ENOMEM;
2052                 goto err_uninstall_notify;
2053         }
2054
2055         snprintf(video->phys, sizeof(video->phys),
2056                 "%s/video/input0", acpi_device_hid(video->device));
2057
2058         input->name = acpi_device_name(video->device);
2059         input->phys = video->phys;
2060         input->id.bustype = BUS_HOST;
2061         input->id.product = 0x06;
2062         input->dev.parent = &device->dev;
2063         input->evbit[0] = BIT(EV_KEY);
2064         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2065         set_bit(KEY_VIDEO_NEXT, input->keybit);
2066         set_bit(KEY_VIDEO_PREV, input->keybit);
2067         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2068         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2069         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2070         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2071         set_bit(KEY_DISPLAY_OFF, input->keybit);
2072         set_bit(KEY_UNKNOWN, input->keybit);
2073
2074         error = input_register_device(input);
2075         if (error)
2076                 goto err_free_input_dev;
2077
2078         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2079                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2080                video->flags.multihead ? "yes" : "no",
2081                video->flags.rom ? "yes" : "no",
2082                video->flags.post ? "yes" : "no");
2083
2084         return 0;
2085
2086  err_free_input_dev:
2087         input_free_device(input);
2088  err_uninstall_notify:
2089         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2090                                    acpi_video_bus_notify);
2091  err_stop_video:
2092         acpi_video_bus_stop_devices(video);
2093         acpi_video_bus_put_devices(video);
2094         kfree(video->attached_array);
2095         acpi_video_bus_remove_fs(device);
2096  err_free_video:
2097         kfree(video);
2098         acpi_driver_data(device) = NULL;
2099
2100         return error;
2101 }
2102
2103 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2104 {
2105         acpi_status status = 0;
2106         struct acpi_video_bus *video = NULL;
2107
2108
2109         if (!device || !acpi_driver_data(device))
2110                 return -EINVAL;
2111
2112         video = acpi_driver_data(device);
2113
2114         acpi_video_bus_stop_devices(video);
2115
2116         status = acpi_remove_notify_handler(video->device->handle,
2117                                             ACPI_DEVICE_NOTIFY,
2118                                             acpi_video_bus_notify);
2119
2120         acpi_video_bus_put_devices(video);
2121         acpi_video_bus_remove_fs(device);
2122
2123         input_unregister_device(video->input);
2124         kfree(video->attached_array);
2125         kfree(video);
2126
2127         return 0;
2128 }
2129
2130 static int __init acpi_video_init(void)
2131 {
2132         int result = 0;
2133
2134
2135         /*
2136            acpi_dbg_level = 0xFFFFFFFF;
2137            acpi_dbg_layer = 0x08000000;
2138          */
2139
2140         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2141         if (!acpi_video_dir)
2142                 return -ENODEV;
2143         acpi_video_dir->owner = THIS_MODULE;
2144
2145         result = acpi_bus_register_driver(&acpi_video_bus);
2146         if (result < 0) {
2147                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2148                 return -ENODEV;
2149         }
2150
2151         return 0;
2152 }
2153
2154 static void __exit acpi_video_exit(void)
2155 {
2156
2157         acpi_bus_unregister_driver(&acpi_video_bus);
2158
2159         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2160
2161         return;
2162 }
2163
2164 module_init(acpi_video_init);
2165 module_exit(acpi_video_exit);