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 <linux/sort.h>
  40 #include <asm/uaccess.h>
  41
  42 #include <acpi/acpi_bus.h>
  43 #include <acpi/acpi_drivers.h>
  44
  45 #define ACPI_VIDEO_CLASS                "video"
  46 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  47 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  48 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  49 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  50 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  51 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  52 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  53
  54 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  55 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  56 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  57 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  58 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  59
  60 #define MAX_NAME_LEN    20
  61
  62 #define ACPI_VIDEO_DISPLAY_CRT  1
  63 #define ACPI_VIDEO_DISPLAY_TV   2
  64 #define ACPI_VIDEO_DISPLAY_DVI  3
  65 #define ACPI_VIDEO_DISPLAY_LCD  4
  66
  67 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  68 ACPI_MODULE_NAME("video");
  69
  70 MODULE_AUTHOR("Bruno Ducrot");
  71 MODULE_DESCRIPTION("ACPI Video Driver");
  72 MODULE_LICENSE("GPL");
  73
  74 static int brightness_switch_enabled = 1;
  75 module_param(brightness_switch_enabled, bool, 0644);
  76
  77 static int acpi_video_bus_add(struct acpi_device *device);
  78 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  79 static int acpi_video_resume(struct acpi_device *device);
  80
  81 static const struct acpi_device_id video_device_ids[] = {
  82         {ACPI_VIDEO_HID, 0},
  83         {"", 0},
  84 };
  85 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  86
  87 static struct acpi_driver acpi_video_bus = {
  88         .name = "video",
  89         .class = ACPI_VIDEO_CLASS,
  90         .ids = video_device_ids,
  91         .ops = {
  92                 .add = acpi_video_bus_add,
  93                 .remove = acpi_video_bus_remove,
  94                 .resume = acpi_video_resume,
  95                 },
  96 };
  97
  98 struct acpi_video_bus_flags {
  99         u8 multihead:1;         /* can switch video heads */
 100         u8 rom:1;               /* can retrieve a video rom */
 101         u8 post:1;              /* can configure the head to */
 102         u8 reserved:5;
 103 };
 104
 105 struct acpi_video_bus_cap {
 106         u8 _DOS:1;              /*Enable/Disable output switching */
 107         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 108         u8 _ROM:1;              /*Get ROM Data */
 109         u8 _GPD:1;              /*Get POST Device */
 110         u8 _SPD:1;              /*Set POST Device */
 111         u8 _VPO:1;              /*Video POST Options */
 112         u8 reserved:2;
 113 };
 114
 115 struct acpi_video_device_attrib {
 116         u32 display_index:4;    /* A zero-based instance of the Display */
 117         u32 display_port_attachment:4;  /*This field differentiates the display type */
 118         u32 display_type:4;     /*Describe the specific type in use */
 119         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 120         u32 bios_can_detect:1;  /*BIOS can detect the device */
 121         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 122                                    the VGA device. */
 123         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 124         u32 reserved:10;        /*Must be 0 */
 125         u32 device_id_scheme:1; /*Device ID Scheme */
 126 };
 127
 128 struct acpi_video_enumerated_device {
 129         union {
 130                 u32 int_val;
 131                 struct acpi_video_device_attrib attrib;
 132         } value;
 133         struct acpi_video_device *bind_info;
 134 };
 135
 136 struct acpi_video_bus {
 137         struct acpi_device *device;
 138         u8 dos_setting;
 139         struct acpi_video_enumerated_device *attached_array;
 140         u8 attached_count;
 141         struct acpi_video_bus_cap cap;
 142         struct acpi_video_bus_flags flags;
 143         struct list_head video_device_list;
 144         struct mutex device_list_lock;  /* protects video_device_list */
 145         struct proc_dir_entry *dir;
 146         struct input_dev *input;
 147         char phys[32];  /* for input device */
 148 };
 149
 150 struct acpi_video_device_flags {
 151         u8 crt:1;
 152         u8 lcd:1;
 153         u8 tvout:1;
 154         u8 dvi:1;
 155         u8 bios:1;
 156         u8 unknown:1;
 157         u8 reserved:2;
 158 };
 159
 160 struct acpi_video_device_cap {
 161         u8 _ADR:1;              /*Return the unique ID */
 162         u8 _BCL:1;              /*Query list of brightness control levels supported */
 163         u8 _BCM:1;              /*Set the brightness level */
 164         u8 _BQC:1;              /* Get current brightness level */
 165         u8 _DDC:1;              /*Return the EDID for this device */
 166         u8 _DCS:1;              /*Return status of output device */
 167         u8 _DGS:1;              /*Query graphics state */
 168         u8 _DSS:1;              /*Device state set */
 169 };
 170
 171 struct acpi_video_device_brightness {
 172         int curr;
 173         int count;
 174         int *levels;
 175 };
 176
 177 struct acpi_video_device {
 178         unsigned long device_id;
 179         struct acpi_video_device_flags flags;
 180         struct acpi_video_device_cap cap;
 181         struct list_head entry;
 182         struct acpi_video_bus *video;
 183         struct acpi_device *dev;
 184         struct acpi_video_device_brightness *brightness;
 185         struct backlight_device *backlight;
 186         struct thermal_cooling_device *cdev;
 187         struct output_device *output_dev;
 188 };
 189
 190 /* bus */
 191 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 192 static struct file_operations acpi_video_bus_info_fops = {
 193         .owner = THIS_MODULE,
 194         .open = acpi_video_bus_info_open_fs,
 195         .read = seq_read,
 196         .llseek = seq_lseek,
 197         .release = single_release,
 198 };
 199
 200 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 201 static struct file_operations acpi_video_bus_ROM_fops = {
 202         .owner = THIS_MODULE,
 203         .open = acpi_video_bus_ROM_open_fs,
 204         .read = seq_read,
 205         .llseek = seq_lseek,
 206         .release = single_release,
 207 };
 208
 209 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 210                                             struct file *file);
 211 static struct file_operations acpi_video_bus_POST_info_fops = {
 212         .owner = THIS_MODULE,
 213         .open = acpi_video_bus_POST_info_open_fs,
 214         .read = seq_read,
 215         .llseek = seq_lseek,
 216         .release = single_release,
 217 };
 218
 219 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 220 static struct file_operations acpi_video_bus_POST_fops = {
 221         .owner = THIS_MODULE,
 222         .open = acpi_video_bus_POST_open_fs,
 223         .read = seq_read,
 224         .llseek = seq_lseek,
 225         .release = single_release,
 226 };
 227
 228 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 229 static struct file_operations acpi_video_bus_DOS_fops = {
 230         .owner = THIS_MODULE,
 231         .open = acpi_video_bus_DOS_open_fs,
 232         .read = seq_read,
 233         .llseek = seq_lseek,
 234         .release = single_release,
 235 };
 236
 237 /* device */
 238 static int acpi_video_device_info_open_fs(struct inode *inode,
 239                                           struct file *file);
 240 static struct file_operations acpi_video_device_info_fops = {
 241         .owner = THIS_MODULE,
 242         .open = acpi_video_device_info_open_fs,
 243         .read = seq_read,
 244         .llseek = seq_lseek,
 245         .release = single_release,
 246 };
 247
 248 static int acpi_video_device_state_open_fs(struct inode *inode,
 249                                            struct file *file);
 250 static struct file_operations acpi_video_device_state_fops = {
 251         .owner = THIS_MODULE,
 252         .open = acpi_video_device_state_open_fs,
 253         .read = seq_read,
 254         .llseek = seq_lseek,
 255         .release = single_release,
 256 };
 257
 258 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 259                                                 struct file *file);
 260 static struct file_operations acpi_video_device_brightness_fops = {
 261         .owner = THIS_MODULE,
 262         .open = acpi_video_device_brightness_open_fs,
 263         .read = seq_read,
 264         .llseek = seq_lseek,
 265         .release = single_release,
 266 };
 267
 268 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 269                                           struct file *file);
 270 static struct file_operations acpi_video_device_EDID_fops = {
 271         .owner = THIS_MODULE,
 272         .open = acpi_video_device_EDID_open_fs,
 273         .read = seq_read,
 274         .llseek = seq_lseek,
 275         .release = single_release,
 276 };
 277
 278 static char device_decode[][30] = {
 279         "motherboard VGA device",
 280         "PCI VGA device",
 281         "AGP VGA device",
 282         "UNKNOWN",
 283 };
 284
 285 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 286 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 287 static void acpi_video_device_bind(struct acpi_video_bus *video,
 288                                    struct acpi_video_device *device);
 289 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 290 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 291                         int level);
 292 static int acpi_video_device_lcd_get_level_current(
 293                         struct acpi_video_device *device,
 294                         unsigned long long *level);
 295 static int acpi_video_get_next_level(struct acpi_video_device *device,
 296                                      u32 level_current, u32 event);
 297 static int acpi_video_switch_brightness(struct acpi_video_device *device,
 298                                          int event);
 299 static int acpi_video_device_get_state(struct acpi_video_device *device,
 300                             unsigned long long *state);
 301 static int acpi_video_output_get(struct output_device *od);
 302 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 303
 304 /*backlight device sysfs support*/
 305 static int acpi_video_get_brightness(struct backlight_device *bd)
 306 {
 307         unsigned long long cur_level;
 308         int i;
 309         struct acpi_video_device *vd =
 310                 (struct acpi_video_device *)bl_get_data(bd);
 311
 312         if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
 313                 return -EINVAL;
 314         for (i = 2; i < vd->brightness->count; i++) {
 315                 if (vd->brightness->levels[i] == cur_level)
 316                         /* The first two entries are special - see page 575
 317                            of the ACPI spec 3.0 */
 318                         return i-2;
 319         }
 320         return 0;
 321 }
 322
 323 static int acpi_video_set_brightness(struct backlight_device *bd)
 324 {
 325         int request_level = bd->props.brightness + 2;
 326         struct acpi_video_device *vd =
 327                 (struct acpi_video_device *)bl_get_data(bd);
 328
 329         return acpi_video_device_lcd_set_level(vd,
 330                                 vd->brightness->levels[request_level]);
 331 }
 332
 333 static struct backlight_ops acpi_backlight_ops = {
 334         .get_brightness = acpi_video_get_brightness,
 335         .update_status  = acpi_video_set_brightness,
 336 };
 337
 338 /*video output device sysfs support*/
 339 static int acpi_video_output_get(struct output_device *od)
 340 {
 341         unsigned long long state;
 342         struct acpi_video_device *vd =
 343                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 344         acpi_video_device_get_state(vd, &state);
 345         return (int)state;
 346 }
 347
 348 static int acpi_video_output_set(struct output_device *od)
 349 {
 350         unsigned long state = od->request_state;
 351         struct acpi_video_device *vd=
 352                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 353         return acpi_video_device_set_state(vd, state);
 354 }
 355
 356 static struct output_properties acpi_output_properties = {
 357         .set_state = acpi_video_output_set,
 358         .get_status = acpi_video_output_get,
 359 };
 360
 361
 362 /* thermal cooling device callbacks */
 363 static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
 364 {
 365         struct acpi_device *device = cdev->devdata;
 366         struct acpi_video_device *video = acpi_driver_data(device);
 367
 368         return sprintf(buf, "%d\n", video->brightness->count - 3);
 369 }
 370
 371 static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
 372 {
 373         struct acpi_device *device = cdev->devdata;
 374         struct acpi_video_device *video = acpi_driver_data(device);
 375         unsigned long long level;
 376         int state;
 377
 378         if (acpi_video_device_lcd_get_level_current(video, &level))
 379                 return -EINVAL;
 380         for (state = 2; state < video->brightness->count; state++)
 381                 if (level == video->brightness->levels[state])
 382                         return sprintf(buf, "%d\n",
 383                                        video->brightness->count - state - 1);
 384
 385         return -EINVAL;
 386 }
 387
 388 static int
 389 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
 390 {
 391         struct acpi_device *device = cdev->devdata;
 392         struct acpi_video_device *video = acpi_driver_data(device);
 393         int level;
 394
 395         if ( state >= video->brightness->count - 2)
 396                 return -EINVAL;
 397
 398         state = video->brightness->count - state;
 399         level = video->brightness->levels[state -1];
 400         return acpi_video_device_lcd_set_level(video, level);
 401 }
 402
 403 static struct thermal_cooling_device_ops video_cooling_ops = {
 404         .get_max_state = video_get_max_state,
 405         .get_cur_state = video_get_cur_state,
 406         .set_cur_state = video_set_cur_state,
 407 };
 408
 409 /* --------------------------------------------------------------------------
 410                                Video Management
 411    -------------------------------------------------------------------------- */
 412
 413 /* device */
 414
 415 static int
 416 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
 417 {
 418         int status;
 419
 420         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 421
 422         return status;
 423 }
 424
 425 static int
 426 acpi_video_device_get_state(struct acpi_video_device *device,
 427                             unsigned long long *state)
 428 {
 429         int status;
 430
 431         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 432
 433         return status;
 434 }
 435
 436 static int
 437 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 438 {
 439         int status;
 440         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 441         struct acpi_object_list args = { 1, &arg0 };
 442         unsigned long long ret;
 443
 444
 445         arg0.integer.value = state;
 446         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 447
 448         return status;
 449 }
 450
 451 static int
 452 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 453                                    union acpi_object **levels)
 454 {
 455         int status;
 456         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 457         union acpi_object *obj;
 458
 459
 460         *levels = NULL;
 461
 462         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 463         if (!ACPI_SUCCESS(status))
 464                 return status;
 465         obj = (union acpi_object *)buffer.pointer;
 466         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 467                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 468                 status = -EFAULT;
 469                 goto err;
 470         }
 471
 472         *levels = obj;
 473
 474         return 0;
 475
 476       err:
 477         kfree(buffer.pointer);
 478
 479         return status;
 480 }
 481
 482 static int
 483 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 484 {
 485         int status;
 486         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 487         struct acpi_object_list args = { 1, &arg0 };
 488         int state;
 489
 490         arg0.integer.value = level;
 491
 492         status = acpi_evaluate_object(device->dev->handle, "_BCM",
 493                                       &args, NULL);
 494         if (ACPI_FAILURE(status)) {
 495                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 496                 return -EIO;
 497         }
 498
 499         device->brightness->curr = level;
 500         for (state = 2; state < device->brightness->count; state++)
 501                 if (level == device->brightness->levels[state]) {
 502                         device->backlight->props.brightness = state - 2;
 503                         return 0;
 504                 }
 505
 506         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 507         return -EINVAL;
 508 }
 509
 510 static int
 511 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 512                                         unsigned long long *level)
 513 {
 514         acpi_status status = AE_OK;
 515
 516         if (device->cap._BQC) {
 517                 status = acpi_evaluate_integer(device->dev->handle, "_BQC",
 518                                                 NULL, level);
 519                 if (ACPI_SUCCESS(status)) {
 520                         device->brightness->curr = *level;
 521                         return 0;
 522                 } else {
 523                         /* Fixme:
 524                          * should we return an error or ignore this failure?
 525                          * dev->brightness->curr is a cached value which stores
 526                          * the correct current backlight level in most cases.
 527                          * ACPI video backlight still works w/ buggy _BQC.
 528                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 529                          */
 530                         ACPI_WARNING((AE_INFO, "Evaluating _BQC failed"));
 531                         device->cap._BQC = 0;
 532                 }
 533         }
 534
 535         *level = device->brightness->curr;
 536         return 0;
 537 }
 538
 539 static int
 540 acpi_video_device_EDID(struct acpi_video_device *device,
 541                        union acpi_object **edid, ssize_t length)
 542 {
 543         int status;
 544         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 545         union acpi_object *obj;
 546         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 547         struct acpi_object_list args = { 1, &arg0 };
 548
 549
 550         *edid = NULL;
 551
 552         if (!device)
 553                 return -ENODEV;
 554         if (length == 128)
 555                 arg0.integer.value = 1;
 556         else if (length == 256)
 557                 arg0.integer.value = 2;
 558         else
 559                 return -EINVAL;
 560
 561         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 562         if (ACPI_FAILURE(status))
 563                 return -ENODEV;
 564
 565         obj = buffer.pointer;
 566
 567         if (obj && obj->type == ACPI_TYPE_BUFFER)
 568                 *edid = obj;
 569         else {
 570                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 571                 status = -EFAULT;
 572                 kfree(obj);
 573         }
 574
 575         return status;
 576 }
 577
 578 /* bus */
 579
 580 static int
 581 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 582 {
 583         int status;
 584         unsigned long long tmp;
 585         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 586         struct acpi_object_list args = { 1, &arg0 };
 587
 588
 589         arg0.integer.value = option;
 590
 591         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 592         if (ACPI_SUCCESS(status))
 593                 status = tmp ? (-EINVAL) : (AE_OK);
 594
 595         return status;
 596 }
 597
 598 static int
 599 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
 600 {
 601         int status;
 602
 603         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 604
 605         return status;
 606 }
 607
 608 static int
 609 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 610                             unsigned long long *options)
 611 {
 612         int status;
 613
 614         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 615         *options &= 3;
 616
 617         return status;
 618 }
 619
 620 /*
 621  *  Arg:
 622  *      video           : video bus device pointer
 623  *      bios_flag       :
 624  *              0.      The system BIOS should NOT automatically switch(toggle)
 625  *                      the active display output.
 626  *              1.      The system BIOS should automatically switch (toggle) the
 627  *                      active display output. No switch event.
 628  *              2.      The _DGS value should be locked.
 629  *              3.      The system BIOS should not automatically switch (toggle) the
 630  *                      active display output, but instead generate the display switch
 631  *                      event notify code.
 632  *      lcd_flag        :
 633  *              0.      The system BIOS should automatically control the brightness level
 634  *                      of the LCD when the power changes from AC to DC
 635  *              1.      The system BIOS should NOT automatically control the brightness
 636  *                      level of the LCD when the power changes from AC to DC.
 637  * Return Value:
 638  *              -1      wrong arg.
 639  */
 640
 641 static int
 642 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 643 {
 644         acpi_integer status = 0;
 645         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 646         struct acpi_object_list args = { 1, &arg0 };
 647
 648
 649         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 650                 status = -1;
 651                 goto Failed;
 652         }
 653         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 654         video->dos_setting = arg0.integer.value;
 655         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 656
 657       Failed:
 658         return status;
 659 }
 660
 661 /*
 662  * Simple comparison function used to sort backlight levels.
 663  */
 664
 665 static int
 666 acpi_video_cmp_level(const void *a, const void *b)
 667 {
 668         return *(int *)a - *(int *)b;
 669 }
 670
 671 /*
 672  *  Arg:
 673  *      device  : video output device (LCD, CRT, ..)
 674  *
 675  *  Return Value:
 676  *      Maximum brightness level
 677  *
 678  *  Allocate and initialize device->brightness.
 679  */
 680
 681 static int
 682 acpi_video_init_brightness(struct acpi_video_device *device)
 683 {
 684         union acpi_object *obj = NULL;
 685         int i, max_level = 0, count = 0;
 686         union acpi_object *o;
 687         struct acpi_video_device_brightness *br = NULL;
 688
 689         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 690                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 691                                                 "LCD brightness level\n"));
 692                 goto out;
 693         }
 694
 695         if (obj->package.count < 2)
 696                 goto out;
 697
 698         br = kzalloc(sizeof(*br), GFP_KERNEL);
 699         if (!br) {
 700                 printk(KERN_ERR "can't allocate memory\n");
 701                 goto out;
 702         }
 703
 704         br->levels = kmalloc(obj->package.count * sizeof *(br->levels),
 705                                 GFP_KERNEL);
 706         if (!br->levels)
 707                 goto out_free;
 708
 709         for (i = 0; i < obj->package.count; i++) {
 710                 o = (union acpi_object *)&obj->package.elements[i];
 711                 if (o->type != ACPI_TYPE_INTEGER) {
 712                         printk(KERN_ERR PREFIX "Invalid data\n");
 713                         continue;
 714                 }
 715                 br->levels[count] = (u32) o->integer.value;
 716
 717                 if (br->levels[count] > max_level)
 718                         max_level = br->levels[count];
 719                 count++;
 720         }
 721
 722         /* don't sort the first two brightness levels */
 723         sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 724                 acpi_video_cmp_level, NULL);
 725
 726         if (count < 2)
 727                 goto out_free_levels;
 728
 729         br->count = count;
 730         device->brightness = br;
 731         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "found %d brightness levels\n", count));
 732         kfree(obj);
 733         return max_level;
 734
 735 out_free_levels:
 736         kfree(br->levels);
 737 out_free:
 738         kfree(br);
 739 out:
 740         device->brightness = NULL;
 741         kfree(obj);
 742         return 0;
 743 }
 744
 745 /*
 746  *  Arg:
 747  *      device  : video output device (LCD, CRT, ..)
 748  *
 749  *  Return Value:
 750  *      None
 751  *
 752  *  Find out all required AML methods defined under the output
 753  *  device.
 754  */
 755
 756 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 757 {
 758         acpi_handle h_dummy1;
 759         u32 max_level = 0;
 760
 761
 762         memset(&device->cap, 0, sizeof(device->cap));
 763
 764         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 765                 device->cap._ADR = 1;
 766         }
 767         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 768                 device->cap._BCL = 1;
 769         }
 770         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 771                 device->cap._BCM = 1;
 772         }
 773         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 774                 device->cap._BQC = 1;
 775         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 776                 device->cap._DDC = 1;
 777         }
 778         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 779                 device->cap._DCS = 1;
 780         }
 781         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 782                 device->cap._DGS = 1;
 783         }
 784         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 785                 device->cap._DSS = 1;
 786         }
 787
 788         if (acpi_video_backlight_support())
 789                 max_level = acpi_video_init_brightness(device);
 790
 791         if (device->cap._BCL && device->cap._BCM && max_level > 0) {
 792                 int result;
 793                 static int count = 0;
 794                 char *name;
 795                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 796                 if (!name)
 797                         return;
 798
 799                 sprintf(name, "acpi_video%d", count++);
 800                 device->backlight = backlight_device_register(name,
 801                         NULL, device, &acpi_backlight_ops);
 802                 device->backlight->props.max_brightness = device->brightness->count-3;
 803                 /*
 804                  * If there exists the _BQC object, the _BQC object will be
 805                  * called to get the current backlight brightness. Otherwise
 806                  * the brightness will be set to the maximum.
 807                  */
 808                 if (device->cap._BQC)
 809                         device->backlight->props.brightness =
 810                                 acpi_video_get_brightness(device->backlight);
 811                 else
 812                         device->backlight->props.brightness =
 813                                 device->backlight->props.max_brightness;
 814                 backlight_update_status(device->backlight);
 815                 kfree(name);
 816
 817                 device->cdev = thermal_cooling_device_register("LCD",
 818                                         device->dev, &video_cooling_ops);
 819                 if (IS_ERR(device->cdev))
 820                         return;
 821
 822                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 823                          device->cdev->id);
 824                 result = sysfs_create_link(&device->dev->dev.kobj,
 825                                 &device->cdev->device.kobj,
 826                                 "thermal_cooling");
 827                 if (result)
 828                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 829                 result = sysfs_create_link(&device->cdev->device.kobj,
 830                                 &device->dev->dev.kobj, "device");
 831                 if (result)
 832                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 833
 834         }
 835
 836         if (acpi_video_display_switch_support()) {
 837
 838                 if (device->cap._DCS && device->cap._DSS) {
 839                         static int count;
 840                         char *name;
 841                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 842                         if (!name)
 843                                 return;
 844                         sprintf(name, "acpi_video%d", count++);
 845                         device->output_dev = video_output_register(name,
 846                                         NULL, device, &acpi_output_properties);
 847                         kfree(name);
 848                 }
 849         }
 850 }
 851
 852 /*
 853  *  Arg:
 854  *      device  : video output device (VGA)
 855  *
 856  *  Return Value:
 857  *      None
 858  *
 859  *  Find out all required AML methods defined under the video bus device.
 860  */
 861
 862 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 863 {
 864         acpi_handle h_dummy1;
 865
 866         memset(&video->cap, 0, sizeof(video->cap));
 867         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 868                 video->cap._DOS = 1;
 869         }
 870         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 871                 video->cap._DOD = 1;
 872         }
 873         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 874                 video->cap._ROM = 1;
 875         }
 876         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 877                 video->cap._GPD = 1;
 878         }
 879         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 880                 video->cap._SPD = 1;
 881         }
 882         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 883                 video->cap._VPO = 1;
 884         }
 885 }
 886
 887 /*
 888  * Check whether the video bus device has required AML method to
 889  * support the desired features
 890  */
 891
 892 static int acpi_video_bus_check(struct acpi_video_bus *video)
 893 {
 894         acpi_status status = -ENOENT;
 895         struct device *dev;
 896
 897         if (!video)
 898                 return -EINVAL;
 899
 900         dev = acpi_get_physical_pci_device(video->device->handle);
 901         if (!dev)
 902                 return -ENODEV;
 903         put_device(dev);
 904
 905         /* Since there is no HID, CID and so on for VGA driver, we have
 906          * to check well known required nodes.
 907          */
 908
 909         /* Does this device support video switching? */
 910         if (video->cap._DOS) {
 911                 video->flags.multihead = 1;
 912                 status = 0;
 913         }
 914
 915         /* Does this device support retrieving a video ROM? */
 916         if (video->cap._ROM) {
 917                 video->flags.rom = 1;
 918                 status = 0;
 919         }
 920
 921         /* Does this device support configuring which video device to POST? */
 922         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 923                 video->flags.post = 1;
 924                 status = 0;
 925         }
 926
 927         return status;
 928 }
 929
 930 /* --------------------------------------------------------------------------
 931                               FS Interface (/proc)
 932    -------------------------------------------------------------------------- */
 933
 934 static struct proc_dir_entry *acpi_video_dir;
 935
 936 /* video devices */
 937
 938 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 939 {
 940         struct acpi_video_device *dev = seq->private;
 941
 942
 943         if (!dev)
 944                 goto end;
 945
 946         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 947         seq_printf(seq, "type:         ");
 948         if (dev->flags.crt)
 949                 seq_printf(seq, "CRT\n");
 950         else if (dev->flags.lcd)
 951                 seq_printf(seq, "LCD\n");
 952         else if (dev->flags.tvout)
 953                 seq_printf(seq, "TVOUT\n");
 954         else if (dev->flags.dvi)
 955                 seq_printf(seq, "DVI\n");
 956         else
 957                 seq_printf(seq, "UNKNOWN\n");
 958
 959         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 960
 961       end:
 962         return 0;
 963 }
 964
 965 static int
 966 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 967 {
 968         return single_open(file, acpi_video_device_info_seq_show,
 969                            PDE(inode)->data);
 970 }
 971
 972 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 973 {
 974         int status;
 975         struct acpi_video_device *dev = seq->private;
 976         unsigned long long state;
 977
 978
 979         if (!dev)
 980                 goto end;
 981
 982         status = acpi_video_device_get_state(dev, &state);
 983         seq_printf(seq, "state:     ");
 984         if (ACPI_SUCCESS(status))
 985                 seq_printf(seq, "0x%02llx\n", state);
 986         else
 987                 seq_printf(seq, "<not supported>\n");
 988
 989         status = acpi_video_device_query(dev, &state);
 990         seq_printf(seq, "query:     ");
 991         if (ACPI_SUCCESS(status))
 992                 seq_printf(seq, "0x%02llx\n", state);
 993         else
 994                 seq_printf(seq, "<not supported>\n");
 995
 996       end:
 997         return 0;
 998 }
 999
1000 static int
1001 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1002 {
1003         return single_open(file, acpi_video_device_state_seq_show,
1004                            PDE(inode)->data);
1005 }
1006
1007 static ssize_t
1008 acpi_video_device_write_state(struct file *file,
1009                               const char __user * buffer,
1010                               size_t count, loff_t * data)
1011 {
1012         int status;
1013         struct seq_file *m = file->private_data;
1014         struct acpi_video_device *dev = m->private;
1015         char str[12] = { 0 };
1016         u32 state = 0;
1017
1018
1019         if (!dev || count + 1 > sizeof str)
1020                 return -EINVAL;
1021
1022         if (copy_from_user(str, buffer, count))
1023                 return -EFAULT;
1024
1025         str[count] = 0;
1026         state = simple_strtoul(str, NULL, 0);
1027         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1028
1029         status = acpi_video_device_set_state(dev, state);
1030
1031         if (status)
1032                 return -EFAULT;
1033
1034         return count;
1035 }
1036
1037 static int
1038 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1039 {
1040         struct acpi_video_device *dev = seq->private;
1041         int i;
1042
1043
1044         if (!dev || !dev->brightness) {
1045                 seq_printf(seq, "<not supported>\n");
1046                 return 0;
1047         }
1048
1049         seq_printf(seq, "levels: ");
1050         for (i = 2; i < dev->brightness->count; i++)
1051                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1052         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1053
1054         return 0;
1055 }
1056
1057 static int
1058 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1059 {
1060         return single_open(file, acpi_video_device_brightness_seq_show,
1061                            PDE(inode)->data);
1062 }
1063
1064 static ssize_t
1065 acpi_video_device_write_brightness(struct file *file,
1066                                    const char __user * buffer,
1067                                    size_t count, loff_t * data)
1068 {
1069         struct seq_file *m = file->private_data;
1070         struct acpi_video_device *dev = m->private;
1071         char str[5] = { 0 };
1072         unsigned int level = 0;
1073         int i;
1074
1075
1076         if (!dev || !dev->brightness || count + 1 > sizeof str)
1077                 return -EINVAL;
1078
1079         if (copy_from_user(str, buffer, count))
1080                 return -EFAULT;
1081
1082         str[count] = 0;
1083         level = simple_strtoul(str, NULL, 0);
1084
1085         if (level > 100)
1086                 return -EFAULT;
1087
1088         /* validate through the list of available levels */
1089         for (i = 2; i < dev->brightness->count; i++)
1090                 if (level == dev->brightness->levels[i]) {
1091                         if (!acpi_video_device_lcd_set_level(dev, level))
1092                                 return count;
1093                         break;
1094                 }
1095
1096         return -EINVAL;
1097 }
1098
1099 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1100 {
1101         struct acpi_video_device *dev = seq->private;
1102         int status;
1103         int i;
1104         union acpi_object *edid = NULL;
1105
1106
1107         if (!dev)
1108                 goto out;
1109
1110         status = acpi_video_device_EDID(dev, &edid, 128);
1111         if (ACPI_FAILURE(status)) {
1112                 status = acpi_video_device_EDID(dev, &edid, 256);
1113         }
1114
1115         if (ACPI_FAILURE(status)) {
1116                 goto out;
1117         }
1118
1119         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1120                 for (i = 0; i < edid->buffer.length; i++)
1121                         seq_putc(seq, edid->buffer.pointer[i]);
1122         }
1123
1124       out:
1125         if (!edid)
1126                 seq_printf(seq, "<not supported>\n");
1127         else
1128                 kfree(edid);
1129
1130         return 0;
1131 }
1132
1133 static int
1134 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1135 {
1136         return single_open(file, acpi_video_device_EDID_seq_show,
1137                            PDE(inode)->data);
1138 }
1139
1140 static int acpi_video_device_add_fs(struct acpi_device *device)
1141 {
1142         struct proc_dir_entry *entry, *device_dir;
1143         struct acpi_video_device *vid_dev;
1144
1145         vid_dev = acpi_driver_data(device);
1146         if (!vid_dev)
1147                 return -ENODEV;
1148
1149         device_dir = proc_mkdir(acpi_device_bid(device),
1150                                 vid_dev->video->dir);
1151         if (!device_dir)
1152                 return -ENOMEM;
1153
1154         device_dir->owner = THIS_MODULE;
1155
1156         /* 'info' [R] */
1157         entry = proc_create_data("info", S_IRUGO, device_dir,
1158                         &acpi_video_device_info_fops, acpi_driver_data(device));
1159         if (!entry)
1160                 goto err_remove_dir;
1161
1162         /* 'state' [R/W] */
1163         acpi_video_device_state_fops.write = acpi_video_device_write_state;
1164         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1165                                  device_dir,
1166                                  &acpi_video_device_state_fops,
1167                                  acpi_driver_data(device));
1168         if (!entry)
1169                 goto err_remove_info;
1170
1171         /* 'brightness' [R/W] */
1172         acpi_video_device_brightness_fops.write =
1173                 acpi_video_device_write_brightness;
1174         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1175                                  device_dir,
1176                                  &acpi_video_device_brightness_fops,
1177                                  acpi_driver_data(device));
1178         if (!entry)
1179                 goto err_remove_state;
1180
1181         /* 'EDID' [R] */
1182         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1183                                  &acpi_video_device_EDID_fops,
1184                                  acpi_driver_data(device));
1185         if (!entry)
1186                 goto err_remove_brightness;
1187
1188         acpi_device_dir(device) = device_dir;
1189
1190         return 0;
1191
1192  err_remove_brightness:
1193         remove_proc_entry("brightness", device_dir);
1194  err_remove_state:
1195         remove_proc_entry("state", device_dir);
1196  err_remove_info:
1197         remove_proc_entry("info", device_dir);
1198  err_remove_dir:
1199         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1200         return -ENOMEM;
1201 }
1202
1203 static int acpi_video_device_remove_fs(struct acpi_device *device)
1204 {
1205         struct acpi_video_device *vid_dev;
1206         struct proc_dir_entry *device_dir;
1207
1208         vid_dev = acpi_driver_data(device);
1209         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1210                 return -ENODEV;
1211
1212         device_dir = acpi_device_dir(device);
1213         if (device_dir) {
1214                 remove_proc_entry("info", device_dir);
1215                 remove_proc_entry("state", device_dir);
1216                 remove_proc_entry("brightness", device_dir);
1217                 remove_proc_entry("EDID", device_dir);
1218                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1219                 acpi_device_dir(device) = NULL;
1220         }
1221
1222         return 0;
1223 }
1224
1225 /* video bus */
1226 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1227 {
1228         struct acpi_video_bus *video = seq->private;
1229
1230
1231         if (!video)
1232                 goto end;
1233
1234         seq_printf(seq, "Switching heads:              %s\n",
1235                    video->flags.multihead ? "yes" : "no");
1236         seq_printf(seq, "Video ROM:                    %s\n",
1237                    video->flags.rom ? "yes" : "no");
1238         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1239                    video->flags.post ? "yes" : "no");
1240
1241       end:
1242         return 0;
1243 }
1244
1245 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1246 {
1247         return single_open(file, acpi_video_bus_info_seq_show,
1248                            PDE(inode)->data);
1249 }
1250
1251 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1252 {
1253         struct acpi_video_bus *video = seq->private;
1254
1255
1256         if (!video)
1257                 goto end;
1258
1259         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1260         seq_printf(seq, "<TODO>\n");
1261
1262       end:
1263         return 0;
1264 }
1265
1266 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1267 {
1268         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1269 }
1270
1271 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1272 {
1273         struct acpi_video_bus *video = seq->private;
1274         unsigned long long options;
1275         int status;
1276
1277
1278         if (!video)
1279                 goto end;
1280
1281         status = acpi_video_bus_POST_options(video, &options);
1282         if (ACPI_SUCCESS(status)) {
1283                 if (!(options & 1)) {
1284                         printk(KERN_WARNING PREFIX
1285                                "The motherboard VGA device is not listed as a possible POST device.\n");
1286                         printk(KERN_WARNING PREFIX
1287                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1288                 }
1289                 printk(KERN_WARNING "%llx\n", options);
1290                 seq_printf(seq, "can POST: <integrated video>");
1291                 if (options & 2)
1292                         seq_printf(seq, " <PCI video>");
1293                 if (options & 4)
1294                         seq_printf(seq, " <AGP video>");
1295                 seq_putc(seq, '\n');
1296         } else
1297                 seq_printf(seq, "<not supported>\n");
1298       end:
1299         return 0;
1300 }
1301
1302 static int
1303 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1304 {
1305         return single_open(file, acpi_video_bus_POST_info_seq_show,
1306                            PDE(inode)->data);
1307 }
1308
1309 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1310 {
1311         struct acpi_video_bus *video = seq->private;
1312         int status;
1313         unsigned long long id;
1314
1315
1316         if (!video)
1317                 goto end;
1318
1319         status = acpi_video_bus_get_POST(video, &id);
1320         if (!ACPI_SUCCESS(status)) {
1321                 seq_printf(seq, "<not supported>\n");
1322                 goto end;
1323         }
1324         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1325
1326       end:
1327         return 0;
1328 }
1329
1330 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1331 {
1332         struct acpi_video_bus *video = seq->private;
1333
1334
1335         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1336
1337         return 0;
1338 }
1339
1340 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1341 {
1342         return single_open(file, acpi_video_bus_POST_seq_show,
1343                            PDE(inode)->data);
1344 }
1345
1346 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1347 {
1348         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1349 }
1350
1351 static ssize_t
1352 acpi_video_bus_write_POST(struct file *file,
1353                           const char __user * buffer,
1354                           size_t count, loff_t * data)
1355 {
1356         int status;
1357         struct seq_file *m = file->private_data;
1358         struct acpi_video_bus *video = m->private;
1359         char str[12] = { 0 };
1360         unsigned long long opt, options;
1361
1362
1363         if (!video || count + 1 > sizeof str)
1364                 return -EINVAL;
1365
1366         status = acpi_video_bus_POST_options(video, &options);
1367         if (!ACPI_SUCCESS(status))
1368                 return -EINVAL;
1369
1370         if (copy_from_user(str, buffer, count))
1371                 return -EFAULT;
1372
1373         str[count] = 0;
1374         opt = strtoul(str, NULL, 0);
1375         if (opt > 3)
1376                 return -EFAULT;
1377
1378         /* just in case an OEM 'forgot' the motherboard... */
1379         options |= 1;
1380
1381         if (options & (1ul << opt)) {
1382                 status = acpi_video_bus_set_POST(video, opt);
1383                 if (!ACPI_SUCCESS(status))
1384                         return -EFAULT;
1385
1386         }
1387
1388         return count;
1389 }
1390
1391 static ssize_t
1392 acpi_video_bus_write_DOS(struct file *file,
1393                          const char __user * buffer,
1394                          size_t count, loff_t * data)
1395 {
1396         int status;
1397         struct seq_file *m = file->private_data;
1398         struct acpi_video_bus *video = m->private;
1399         char str[12] = { 0 };
1400         unsigned long opt;
1401
1402
1403         if (!video || count + 1 > sizeof str)
1404                 return -EINVAL;
1405
1406         if (copy_from_user(str, buffer, count))
1407                 return -EFAULT;
1408
1409         str[count] = 0;
1410         opt = strtoul(str, NULL, 0);
1411         if (opt > 7)
1412                 return -EFAULT;
1413
1414         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1415
1416         if (!ACPI_SUCCESS(status))
1417                 return -EFAULT;
1418
1419         return count;
1420 }
1421
1422 static int acpi_video_bus_add_fs(struct acpi_device *device)
1423 {
1424         struct acpi_video_bus *video = acpi_driver_data(device);
1425         struct proc_dir_entry *device_dir;
1426         struct proc_dir_entry *entry;
1427
1428         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1429         if (!device_dir)
1430                 return -ENOMEM;
1431
1432         device_dir->owner = THIS_MODULE;
1433
1434         /* 'info' [R] */
1435         entry = proc_create_data("info", S_IRUGO, device_dir,
1436                                  &acpi_video_bus_info_fops,
1437                                  acpi_driver_data(device));
1438         if (!entry)
1439                 goto err_remove_dir;
1440
1441         /* 'ROM' [R] */
1442         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1443                                  &acpi_video_bus_ROM_fops,
1444                                  acpi_driver_data(device));
1445         if (!entry)
1446                 goto err_remove_info;
1447
1448         /* 'POST_info' [R] */
1449         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1450                                  &acpi_video_bus_POST_info_fops,
1451                                  acpi_driver_data(device));
1452         if (!entry)
1453                 goto err_remove_rom;
1454
1455         /* 'POST' [R/W] */
1456         acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1457         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1458                                  device_dir,
1459                                  &acpi_video_bus_POST_fops,
1460                                  acpi_driver_data(device));
1461         if (!entry)
1462                 goto err_remove_post_info;
1463
1464         /* 'DOS' [R/W] */
1465         acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1466         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1467                                  device_dir,
1468                                  &acpi_video_bus_DOS_fops,
1469                                  acpi_driver_data(device));
1470         if (!entry)
1471                 goto err_remove_post;
1472
1473         video->dir = acpi_device_dir(device) = device_dir;
1474         return 0;
1475
1476  err_remove_post:
1477         remove_proc_entry("POST", device_dir);
1478  err_remove_post_info:
1479         remove_proc_entry("POST_info", device_dir);
1480  err_remove_rom:
1481         remove_proc_entry("ROM", device_dir);
1482  err_remove_info:
1483         remove_proc_entry("info", device_dir);
1484  err_remove_dir:
1485         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1486         return -ENOMEM;
1487 }
1488
1489 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1490 {
1491         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1492
1493         if (device_dir) {
1494                 remove_proc_entry("info", device_dir);
1495                 remove_proc_entry("ROM", device_dir);
1496                 remove_proc_entry("POST_info", device_dir);
1497                 remove_proc_entry("POST", device_dir);
1498                 remove_proc_entry("DOS", device_dir);
1499                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1500                 acpi_device_dir(device) = NULL;
1501         }
1502
1503         return 0;
1504 }
1505
1506 /* --------------------------------------------------------------------------
1507                                  Driver Interface
1508    -------------------------------------------------------------------------- */
1509
1510 /* device interface */
1511 static struct acpi_video_device_attrib*
1512 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1513 {
1514         struct acpi_video_enumerated_device *ids;
1515         int i;
1516
1517         for (i = 0; i < video->attached_count; i++) {
1518                 ids = &video->attached_array[i];
1519                 if ((ids->value.int_val & 0xffff) == device_id)
1520                         return &ids->value.attrib;
1521         }
1522
1523         return NULL;
1524 }
1525
1526 static int
1527 acpi_video_bus_get_one_device(struct acpi_device *device,
1528                               struct acpi_video_bus *video)
1529 {
1530         unsigned long long device_id;
1531         int status;
1532         struct acpi_video_device *data;
1533         struct acpi_video_device_attrib* attribute;
1534
1535         if (!device || !video)
1536                 return -EINVAL;
1537
1538         status =
1539             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1540         if (ACPI_SUCCESS(status)) {
1541
1542                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1543                 if (!data)
1544                         return -ENOMEM;
1545
1546                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1547                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1548                 device->driver_data = data;
1549
1550                 data->device_id = device_id;
1551                 data->video = video;
1552                 data->dev = device;
1553
1554                 attribute = acpi_video_get_device_attr(video, device_id);
1555
1556                 if((attribute != NULL) && attribute->device_id_scheme) {
1557                         switch (attribute->display_type) {
1558                         case ACPI_VIDEO_DISPLAY_CRT:
1559                                 data->flags.crt = 1;
1560                                 break;
1561                         case ACPI_VIDEO_DISPLAY_TV:
1562                                 data->flags.tvout = 1;
1563                                 break;
1564                         case ACPI_VIDEO_DISPLAY_DVI:
1565                                 data->flags.dvi = 1;
1566                                 break;
1567                         case ACPI_VIDEO_DISPLAY_LCD:
1568                                 data->flags.lcd = 1;
1569                                 break;
1570                         default:
1571                                 data->flags.unknown = 1;
1572                                 break;
1573                         }
1574                         if(attribute->bios_can_detect)
1575                                 data->flags.bios = 1;
1576                 } else
1577                         data->flags.unknown = 1;
1578
1579                 acpi_video_device_bind(video, data);
1580                 acpi_video_device_find_cap(data);
1581
1582                 status = acpi_install_notify_handler(device->handle,
1583                                                      ACPI_DEVICE_NOTIFY,
1584                                                      acpi_video_device_notify,
1585                                                      data);
1586                 if (ACPI_FAILURE(status)) {
1587                         printk(KERN_ERR PREFIX
1588                                           "Error installing notify handler\n");
1589                         if(data->brightness)
1590                                 kfree(data->brightness->levels);
1591                         kfree(data->brightness);
1592                         kfree(data);
1593                         return -ENODEV;
1594                 }
1595
1596                 mutex_lock(&video->device_list_lock);
1597                 list_add_tail(&data->entry, &video->video_device_list);
1598                 mutex_unlock(&video->device_list_lock);
1599
1600                 acpi_video_device_add_fs(device);
1601
1602                 return 0;
1603         }
1604
1605         return -ENOENT;
1606 }
1607
1608 /*
1609  *  Arg:
1610  *      video   : video bus device
1611  *
1612  *  Return:
1613  *      none
1614  *
1615  *  Enumerate the video device list of the video bus,
1616  *  bind the ids with the corresponding video devices
1617  *  under the video bus.
1618  */
1619
1620 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1621 {
1622         struct acpi_video_device *dev;
1623
1624         mutex_lock(&video->device_list_lock);
1625
1626         list_for_each_entry(dev, &video->video_device_list, entry)
1627                 acpi_video_device_bind(video, dev);
1628
1629         mutex_unlock(&video->device_list_lock);
1630 }
1631
1632 /*
1633  *  Arg:
1634  *      video   : video bus device
1635  *      device  : video output device under the video
1636  *              bus
1637  *
1638  *  Return:
1639  *      none
1640  *
1641  *  Bind the ids with the corresponding video devices
1642  *  under the video bus.
1643  */
1644
1645 static void
1646 acpi_video_device_bind(struct acpi_video_bus *video,
1647                        struct acpi_video_device *device)
1648 {
1649         struct acpi_video_enumerated_device *ids;
1650         int i;
1651
1652         for (i = 0; i < video->attached_count; i++) {
1653                 ids = &video->attached_array[i];
1654                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1655                         ids->bind_info = device;
1656                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1657                 }
1658         }
1659 }
1660
1661 /*
1662  *  Arg:
1663  *      video   : video bus device
1664  *
1665  *  Return:
1666  *      < 0     : error
1667  *
1668  *  Call _DOD to enumerate all devices attached to display adapter
1669  *
1670  */
1671
1672 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1673 {
1674         int status;
1675         int count;
1676         int i;
1677         struct acpi_video_enumerated_device *active_list;
1678         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1679         union acpi_object *dod = NULL;
1680         union acpi_object *obj;
1681
1682         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1683         if (!ACPI_SUCCESS(status)) {
1684                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1685                 return status;
1686         }
1687
1688         dod = buffer.pointer;
1689         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1690                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1691                 status = -EFAULT;
1692                 goto out;
1693         }
1694
1695         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1696                           dod->package.count));
1697
1698         active_list = kcalloc(1 + dod->package.count,
1699                               sizeof(struct acpi_video_enumerated_device),
1700                               GFP_KERNEL);
1701         if (!active_list) {
1702                 status = -ENOMEM;
1703                 goto out;
1704         }
1705
1706         count = 0;
1707         for (i = 0; i < dod->package.count; i++) {
1708                 obj = &dod->package.elements[i];
1709
1710                 if (obj->type != ACPI_TYPE_INTEGER) {
1711                         printk(KERN_ERR PREFIX
1712                                 "Invalid _DOD data in element %d\n", i);
1713                         continue;
1714                 }
1715
1716                 active_list[count].value.int_val = obj->integer.value;
1717                 active_list[count].bind_info = NULL;
1718                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1719                                   (int)obj->integer.value));
1720                 count++;
1721         }
1722
1723         kfree(video->attached_array);
1724
1725         video->attached_array = active_list;
1726         video->attached_count = count;
1727
1728  out:
1729         kfree(buffer.pointer);
1730         return status;
1731 }
1732
1733 static int
1734 acpi_video_get_next_level(struct acpi_video_device *device,
1735                           u32 level_current, u32 event)
1736 {
1737         int min, max, min_above, max_below, i, l, delta = 255;
1738         max = max_below = 0;
1739         min = min_above = 255;
1740         /* Find closest level to level_current */
1741         for (i = 2; i < device->brightness->count; i++) {
1742                 l = device->brightness->levels[i];
1743                 if (abs(l - level_current) < abs(delta)) {
1744                         delta = l - level_current;
1745                         if (!delta)
1746                                 break;
1747                 }
1748         }
1749         /* Ajust level_current to closest available level */
1750         level_current += delta;
1751         for (i = 2; i < device->brightness->count; i++) {
1752                 l = device->brightness->levels[i];
1753                 if (l < min)
1754                         min = l;
1755                 if (l > max)
1756                         max = l;
1757                 if (l < min_above && l > level_current)
1758                         min_above = l;
1759                 if (l > max_below && l < level_current)
1760                         max_below = l;
1761         }
1762
1763         switch (event) {
1764         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1765                 return (level_current < max) ? min_above : min;
1766         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1767                 return (level_current < max) ? min_above : max;
1768         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1769                 return (level_current > min) ? max_below : min;
1770         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1771         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1772                 return 0;
1773         default:
1774                 return level_current;
1775         }
1776 }
1777
1778 static int
1779 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1780 {
1781         unsigned long long level_current, level_next;
1782         int result = -EINVAL;
1783
1784         if (!device->brightness)
1785                 goto out;
1786
1787         result = acpi_video_device_lcd_get_level_current(device,
1788                                                          &level_current);
1789         if (result)
1790                 goto out;
1791
1792         level_next = acpi_video_get_next_level(device, level_current, event);
1793
1794         result = acpi_video_device_lcd_set_level(device, level_next);
1795
1796 out:
1797         if (result)
1798                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1799
1800         return result;
1801 }
1802
1803 static int
1804 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1805                            struct acpi_device *device)
1806 {
1807         int status = 0;
1808         struct acpi_device *dev;
1809
1810         acpi_video_device_enumerate(video);
1811
1812         list_for_each_entry(dev, &device->children, node) {
1813
1814                 status = acpi_video_bus_get_one_device(dev, video);
1815                 if (ACPI_FAILURE(status)) {
1816                         printk(KERN_WARNING PREFIX
1817                                         "Cant attach device");
1818                         continue;
1819                 }
1820         }
1821         return status;
1822 }
1823
1824 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1825 {
1826         acpi_status status;
1827         struct acpi_video_bus *video;
1828
1829
1830         if (!device || !device->video)
1831                 return -ENOENT;
1832
1833         video = device->video;
1834
1835         acpi_video_device_remove_fs(device->dev);
1836
1837         status = acpi_remove_notify_handler(device->dev->handle,
1838                                             ACPI_DEVICE_NOTIFY,
1839                                             acpi_video_device_notify);
1840         backlight_device_unregister(device->backlight);
1841         if (device->cdev) {
1842                 sysfs_remove_link(&device->dev->dev.kobj,
1843                                   "thermal_cooling");
1844                 sysfs_remove_link(&device->cdev->device.kobj,
1845                                   "device");
1846                 thermal_cooling_device_unregister(device->cdev);
1847                 device->cdev = NULL;
1848         }
1849         video_output_unregister(device->output_dev);
1850
1851         return 0;
1852 }
1853
1854 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1855 {
1856         int status;
1857         struct acpi_video_device *dev, *next;
1858
1859         mutex_lock(&video->device_list_lock);
1860
1861         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1862
1863                 status = acpi_video_bus_put_one_device(dev);
1864                 if (ACPI_FAILURE(status))
1865                         printk(KERN_WARNING PREFIX
1866                                "hhuuhhuu bug in acpi video driver.\n");
1867
1868                 if (dev->brightness) {
1869                         kfree(dev->brightness->levels);
1870                         kfree(dev->brightness);
1871                 }
1872                 list_del(&dev->entry);
1873                 kfree(dev);
1874         }
1875
1876         mutex_unlock(&video->device_list_lock);
1877
1878         return 0;
1879 }
1880
1881 /* acpi_video interface */
1882
1883 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1884 {
1885         return acpi_video_bus_DOS(video, 0, 0);
1886 }
1887
1888 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1889 {
1890         return acpi_video_bus_DOS(video, 0, 1);
1891 }
1892
1893 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1894 {
1895         struct acpi_video_bus *video = data;
1896         struct acpi_device *device = NULL;
1897         struct input_dev *input;
1898         int keycode;
1899
1900         if (!video)
1901                 return;
1902
1903         device = video->device;
1904         input = video->input;
1905
1906         switch (event) {
1907         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1908                                          * most likely via hotkey. */
1909                 acpi_bus_generate_proc_event(device, event, 0);
1910                 keycode = KEY_SWITCHVIDEOMODE;
1911                 break;
1912
1913         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1914                                          * connector. */
1915                 acpi_video_device_enumerate(video);
1916                 acpi_video_device_rebind(video);
1917                 acpi_bus_generate_proc_event(device, event, 0);
1918                 keycode = KEY_SWITCHVIDEOMODE;
1919                 break;
1920
1921         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1922                 acpi_bus_generate_proc_event(device, event, 0);
1923                 keycode = KEY_SWITCHVIDEOMODE;
1924                 break;
1925         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1926                 acpi_bus_generate_proc_event(device, event, 0);
1927                 keycode = KEY_VIDEO_NEXT;
1928                 break;
1929         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1930                 acpi_bus_generate_proc_event(device, event, 0);
1931                 keycode = KEY_VIDEO_PREV;
1932                 break;
1933
1934         default:
1935                 keycode = KEY_UNKNOWN;
1936                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1937                                   "Unsupported event [0x%x]\n", event));
1938                 break;
1939         }
1940
1941         acpi_notifier_call_chain(device, event, 0);
1942         input_report_key(input, keycode, 1);
1943         input_sync(input);
1944         input_report_key(input, keycode, 0);
1945         input_sync(input);
1946
1947         return;
1948 }
1949
1950 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1951 {
1952         struct acpi_video_device *video_device = data;
1953         struct acpi_device *device = NULL;
1954         struct acpi_video_bus *bus;
1955         struct input_dev *input;
1956         int keycode;
1957
1958         if (!video_device)
1959                 return;
1960
1961         device = video_device->dev;
1962         bus = video_device->video;
1963         input = bus->input;
1964
1965         switch (event) {
1966         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1967                 if (brightness_switch_enabled)
1968                         acpi_video_switch_brightness(video_device, event);
1969                 acpi_bus_generate_proc_event(device, event, 0);
1970                 keycode = KEY_BRIGHTNESS_CYCLE;
1971                 break;
1972         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1973                 if (brightness_switch_enabled)
1974                         acpi_video_switch_brightness(video_device, event);
1975                 acpi_bus_generate_proc_event(device, event, 0);
1976                 keycode = KEY_BRIGHTNESSUP;
1977                 break;
1978         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1979                 if (brightness_switch_enabled)
1980                         acpi_video_switch_brightness(video_device, event);
1981                 acpi_bus_generate_proc_event(device, event, 0);
1982                 keycode = KEY_BRIGHTNESSDOWN;
1983                 break;
1984         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1985                 if (brightness_switch_enabled)
1986                         acpi_video_switch_brightness(video_device, event);
1987                 acpi_bus_generate_proc_event(device, event, 0);
1988                 keycode = KEY_BRIGHTNESS_ZERO;
1989                 break;
1990         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1991                 if (brightness_switch_enabled)
1992                         acpi_video_switch_brightness(video_device, event);
1993                 acpi_bus_generate_proc_event(device, event, 0);
1994                 keycode = KEY_DISPLAY_OFF;
1995                 break;
1996         default:
1997                 keycode = KEY_UNKNOWN;
1998                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1999                                   "Unsupported event [0x%x]\n", event));
2000                 break;
2001         }
2002
2003         acpi_notifier_call_chain(device, event, 0);
2004         input_report_key(input, keycode, 1);
2005         input_sync(input);
2006         input_report_key(input, keycode, 0);
2007         input_sync(input);
2008
2009         return;
2010 }
2011
2012 static int instance;
2013 static int acpi_video_resume(struct acpi_device *device)
2014 {
2015         struct acpi_video_bus *video;
2016         struct acpi_video_device *video_device;
2017         int i;
2018
2019         if (!device || !acpi_driver_data(device))
2020                 return -EINVAL;
2021
2022         video = acpi_driver_data(device);
2023
2024         for (i = 0; i < video->attached_count; i++) {
2025                 video_device = video->attached_array[i].bind_info;
2026                 if (video_device && video_device->backlight)
2027                         acpi_video_set_brightness(video_device->backlight);
2028         }
2029         return AE_OK;
2030 }
2031
2032 static int acpi_video_bus_add(struct acpi_device *device)
2033 {
2034         acpi_status status;
2035         struct acpi_video_bus *video;
2036         struct input_dev *input;
2037         int error;
2038
2039         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2040         if (!video)
2041                 return -ENOMEM;
2042
2043         /* a hack to fix the duplicate name "VID" problem on T61 */
2044         if (!strcmp(device->pnp.bus_id, "VID")) {
2045                 if (instance)
2046                         device->pnp.bus_id[3] = '0' + instance;
2047                 instance ++;
2048         }
2049         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2050         if (!strcmp(device->pnp.bus_id, "VGA")) {
2051                 if (instance)
2052                         device->pnp.bus_id[3] = '0' + instance;
2053                 instance++;
2054         }
2055
2056         video->device = device;
2057         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2058         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2059         device->driver_data = video;
2060
2061         acpi_video_bus_find_cap(video);
2062         error = acpi_video_bus_check(video);
2063         if (error)
2064                 goto err_free_video;
2065
2066         error = acpi_video_bus_add_fs(device);
2067         if (error)
2068                 goto err_free_video;
2069
2070         mutex_init(&video->device_list_lock);
2071         INIT_LIST_HEAD(&video->video_device_list);
2072
2073         acpi_video_bus_get_devices(video, device);
2074         acpi_video_bus_start_devices(video);
2075
2076         status = acpi_install_notify_handler(device->handle,
2077                                              ACPI_DEVICE_NOTIFY,
2078                                              acpi_video_bus_notify, video);
2079         if (ACPI_FAILURE(status)) {
2080                 printk(KERN_ERR PREFIX
2081                                   "Error installing notify handler\n");
2082                 error = -ENODEV;
2083                 goto err_stop_video;
2084         }
2085
2086         video->input = input = input_allocate_device();
2087         if (!input) {
2088                 error = -ENOMEM;
2089                 goto err_uninstall_notify;
2090         }
2091
2092         snprintf(video->phys, sizeof(video->phys),
2093                 "%s/video/input0", acpi_device_hid(video->device));
2094
2095         input->name = acpi_device_name(video->device);
2096         input->phys = video->phys;
2097         input->id.bustype = BUS_HOST;
2098         input->id.product = 0x06;
2099         input->dev.parent = &device->dev;
2100         input->evbit[0] = BIT(EV_KEY);
2101         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2102         set_bit(KEY_VIDEO_NEXT, input->keybit);
2103         set_bit(KEY_VIDEO_PREV, input->keybit);
2104         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2105         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2106         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2107         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2108         set_bit(KEY_DISPLAY_OFF, input->keybit);
2109         set_bit(KEY_UNKNOWN, input->keybit);
2110
2111         error = input_register_device(input);
2112         if (error)
2113                 goto err_free_input_dev;
2114
2115         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2116                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2117                video->flags.multihead ? "yes" : "no",
2118                video->flags.rom ? "yes" : "no",
2119                video->flags.post ? "yes" : "no");
2120
2121         return 0;
2122
2123  err_free_input_dev:
2124         input_free_device(input);
2125  err_uninstall_notify:
2126         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2127                                    acpi_video_bus_notify);
2128  err_stop_video:
2129         acpi_video_bus_stop_devices(video);
2130         acpi_video_bus_put_devices(video);
2131         kfree(video->attached_array);
2132         acpi_video_bus_remove_fs(device);
2133  err_free_video:
2134         kfree(video);
2135         device->driver_data = NULL;
2136
2137         return error;
2138 }
2139
2140 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2141 {
2142         acpi_status status = 0;
2143         struct acpi_video_bus *video = NULL;
2144
2145
2146         if (!device || !acpi_driver_data(device))
2147                 return -EINVAL;
2148
2149         video = acpi_driver_data(device);
2150
2151         acpi_video_bus_stop_devices(video);
2152
2153         status = acpi_remove_notify_handler(video->device->handle,
2154                                             ACPI_DEVICE_NOTIFY,
2155                                             acpi_video_bus_notify);
2156
2157         acpi_video_bus_put_devices(video);
2158         acpi_video_bus_remove_fs(device);
2159
2160         input_unregister_device(video->input);
2161         kfree(video->attached_array);
2162         kfree(video);
2163
2164         return 0;
2165 }
2166
2167 static int __init acpi_video_init(void)
2168 {
2169         int result = 0;
2170
2171         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2172         if (!acpi_video_dir)
2173                 return -ENODEV;
2174         acpi_video_dir->owner = THIS_MODULE;
2175
2176         result = acpi_bus_register_driver(&acpi_video_bus);
2177         if (result < 0) {
2178                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2179                 return -ENODEV;
2180         }
2181
2182         return 0;
2183 }
2184
2185 static void __exit acpi_video_exit(void)
2186 {
2187
2188         acpi_bus_unregister_driver(&acpi_video_bus);
2189
2190         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2191
2192         return;
2193 }
2194
2195 module_init(acpi_video_init);
2196 module_exit(acpi_video_exit);