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   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/list.h>
  32 #include <linux/mutex.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/input.h>
  36 #include <linux/backlight.h>
  37 #include <linux/thermal.h>
  38 #include <linux/video_output.h>
  39 #include <asm/uaccess.h>
  40
  41 #include <acpi/acpi_bus.h>
  42 #include <acpi/acpi_drivers.h>
  43
  44 #define ACPI_VIDEO_COMPONENT            0x08000000
  45 #define ACPI_VIDEO_CLASS                "video"
  46 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  47 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  48 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  49 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  50 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  51 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  52 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  53
  54 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  55 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  56 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  57 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  58 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  59
  60 #define MAX_NAME_LEN    20
  61
  62 #define ACPI_VIDEO_DISPLAY_CRT  1
  63 #define ACPI_VIDEO_DISPLAY_TV   2
  64 #define ACPI_VIDEO_DISPLAY_DVI  3
  65 #define ACPI_VIDEO_DISPLAY_LCD  4
  66
  67 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  68 ACPI_MODULE_NAME("video");
  69
  70 MODULE_AUTHOR("Bruno Ducrot");
  71 MODULE_DESCRIPTION("ACPI Video Driver");
  72 MODULE_LICENSE("GPL");
  73
  74 static int brightness_switch_enabled = 1;
  75 module_param(brightness_switch_enabled, bool, 0644);
  76
  77 static int acpi_video_bus_add(struct acpi_device *device);
  78 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  79 static int acpi_video_resume(struct acpi_device *device);
  80
  81 static const struct acpi_device_id video_device_ids[] = {
  82         {ACPI_VIDEO_HID, 0},
  83         {"", 0},
  84 };
  85 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  86
  87 static struct acpi_driver acpi_video_bus = {
  88         .name = "video",
  89         .class = ACPI_VIDEO_CLASS,
  90         .ids = video_device_ids,
  91         .ops = {
  92                 .add = acpi_video_bus_add,
  93                 .remove = acpi_video_bus_remove,
  94                 .resume = acpi_video_resume,
  95                 },
  96 };
  97
  98 struct acpi_video_bus_flags {
  99         u8 multihead:1;         /* can switch video heads */
 100         u8 rom:1;               /* can retrieve a video rom */
 101         u8 post:1;              /* can configure the head to */
 102         u8 reserved:5;
 103 };
 104
 105 struct acpi_video_bus_cap {
 106         u8 _DOS:1;              /*Enable/Disable output switching */
 107         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 108         u8 _ROM:1;              /*Get ROM Data */
 109         u8 _GPD:1;              /*Get POST Device */
 110         u8 _SPD:1;              /*Set POST Device */
 111         u8 _VPO:1;              /*Video POST Options */
 112         u8 reserved:2;
 113 };
 114
 115 struct acpi_video_device_attrib {
 116         u32 display_index:4;    /* A zero-based instance of the Display */
 117         u32 display_port_attachment:4;  /*This field differentiates the display type */
 118         u32 display_type:4;     /*Describe the specific type in use */
 119         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 120         u32 bios_can_detect:1;  /*BIOS can detect the device */
 121         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 122                                    the VGA device. */
 123         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 124         u32 reserved:10;        /*Must be 0 */
 125         u32 device_id_scheme:1; /*Device ID Scheme */
 126 };
 127
 128 struct acpi_video_enumerated_device {
 129         union {
 130                 u32 int_val;
 131                 struct acpi_video_device_attrib attrib;
 132         } value;
 133         struct acpi_video_device *bind_info;
 134 };
 135
 136 struct acpi_video_bus {
 137         struct acpi_device *device;
 138         u8 dos_setting;
 139         struct acpi_video_enumerated_device *attached_array;
 140         u8 attached_count;
 141         struct acpi_video_bus_cap cap;
 142         struct acpi_video_bus_flags flags;
 143         struct list_head video_device_list;
 144         struct mutex device_list_lock;  /* protects video_device_list */
 145         struct proc_dir_entry *dir;
 146         struct input_dev *input;
 147         char phys[32];  /* for input device */
 148 };
 149
 150 struct acpi_video_device_flags {
 151         u8 crt:1;
 152         u8 lcd:1;
 153         u8 tvout:1;
 154         u8 dvi:1;
 155         u8 bios:1;
 156         u8 unknown:1;
 157         u8 reserved:2;
 158 };
 159
 160 struct acpi_video_device_cap {
 161         u8 _ADR:1;              /*Return the unique ID */
 162         u8 _BCL:1;              /*Query list of brightness control levels supported */
 163         u8 _BCM:1;              /*Set the brightness level */
 164         u8 _BQC:1;              /* Get current brightness level */
 165         u8 _DDC:1;              /*Return the EDID for this device */
 166         u8 _DCS:1;              /*Return status of output device */
 167         u8 _DGS:1;              /*Query graphics state */
 168         u8 _DSS:1;              /*Device state set */
 169 };
 170
 171 struct acpi_video_device_brightness {
 172         int curr;
 173         int count;
 174         int *levels;
 175 };
 176
 177 struct acpi_video_device {
 178         unsigned long device_id;
 179         struct acpi_video_device_flags flags;
 180         struct acpi_video_device_cap cap;
 181         struct list_head entry;
 182         struct acpi_video_bus *video;
 183         struct acpi_device *dev;
 184         struct acpi_video_device_brightness *brightness;
 185         struct backlight_device *backlight;
 186         struct thermal_cooling_device *cdev;
 187         struct output_device *output_dev;
 188 };
 189
 190 /* bus */
 191 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 192 static struct file_operations acpi_video_bus_info_fops = {
 193         .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 *level);
 295 static int acpi_video_get_next_level(struct acpi_video_device *device,
 296                                      u32 level_current, u32 event);
 297 static void 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 *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 cur_level;
 308         int i;
 309         struct acpi_video_device *vd =
 310                 (struct acpi_video_device *)bl_get_data(bd);
 311         acpi_video_device_lcd_get_level_current(vd, &cur_level);
 312         for (i = 2; i < vd->brightness->count; i++) {
 313                 if (vd->brightness->levels[i] == cur_level)
 314                         /* The first two entries are special - see page 575
 315                            of the ACPI spec 3.0 */
 316                         return i-2;
 317         }
 318         return 0;
 319 }
 320
 321 static int acpi_video_set_brightness(struct backlight_device *bd)
 322 {
 323         int request_level = bd->props.brightness+2;
 324         struct acpi_video_device *vd =
 325                 (struct acpi_video_device *)bl_get_data(bd);
 326         acpi_video_device_lcd_set_level(vd,
 327                                         vd->brightness->levels[request_level]);
 328         return 0;
 329 }
 330
 331 static struct backlight_ops acpi_backlight_ops = {
 332         .get_brightness = acpi_video_get_brightness,
 333         .update_status  = acpi_video_set_brightness,
 334 };
 335
 336 /*video output device sysfs support*/
 337 static int acpi_video_output_get(struct output_device *od)
 338 {
 339         unsigned long state;
 340         struct acpi_video_device *vd =
 341                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 342         acpi_video_device_get_state(vd, &state);
 343         return (int)state;
 344 }
 345
 346 static int acpi_video_output_set(struct output_device *od)
 347 {
 348         unsigned long state = od->request_state;
 349         struct acpi_video_device *vd=
 350                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 351         return acpi_video_device_set_state(vd, state);
 352 }
 353
 354 static struct output_properties acpi_output_properties = {
 355         .set_state = acpi_video_output_set,
 356         .get_status = acpi_video_output_get,
 357 };
 358
 359
 360 /* thermal cooling device callbacks */
 361 static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
 362 {
 363         struct acpi_device *device = cdev->devdata;
 364         struct acpi_video_device *video = acpi_driver_data(device);
 365
 366         return sprintf(buf, "%d\n", video->brightness->count - 3);
 367 }
 368
 369 static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
 370 {
 371         struct acpi_device *device = cdev->devdata;
 372         struct acpi_video_device *video = acpi_driver_data(device);
 373         unsigned long level;
 374         int state;
 375
 376         acpi_video_device_lcd_get_level_current(video, &level);
 377         for (state = 2; state < video->brightness->count; state++)
 378                 if (level == video->brightness->levels[state])
 379                         return sprintf(buf, "%d\n",
 380                                        video->brightness->count - state - 1);
 381
 382         return -EINVAL;
 383 }
 384
 385 static int
 386 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
 387 {
 388         struct acpi_device *device = cdev->devdata;
 389         struct acpi_video_device *video = acpi_driver_data(device);
 390         int level;
 391
 392         if ( state >= video->brightness->count - 2)
 393                 return -EINVAL;
 394
 395         state = video->brightness->count - state;
 396         level = video->brightness->levels[state -1];
 397         return acpi_video_device_lcd_set_level(video, level);
 398 }
 399
 400 static struct thermal_cooling_device_ops video_cooling_ops = {
 401         .get_max_state = video_get_max_state,
 402         .get_cur_state = video_get_cur_state,
 403         .set_cur_state = video_set_cur_state,
 404 };
 405
 406 /* --------------------------------------------------------------------------
 407                                Video Management
 408    -------------------------------------------------------------------------- */
 409
 410 /* device */
 411
 412 static int
 413 acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
 414 {
 415         int status;
 416
 417         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 418
 419         return status;
 420 }
 421
 422 static int
 423 acpi_video_device_get_state(struct acpi_video_device *device,
 424                             unsigned long *state)
 425 {
 426         int status;
 427
 428         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 429
 430         return status;
 431 }
 432
 433 static int
 434 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 435 {
 436         int status;
 437         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 438         struct acpi_object_list args = { 1, &arg0 };
 439         unsigned long ret;
 440
 441
 442         arg0.integer.value = state;
 443         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 444
 445         return status;
 446 }
 447
 448 static int
 449 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 450                                    union acpi_object **levels)
 451 {
 452         int status;
 453         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 454         union acpi_object *obj;
 455
 456
 457         *levels = NULL;
 458
 459         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 460         if (!ACPI_SUCCESS(status))
 461                 return status;
 462         obj = (union acpi_object *)buffer.pointer;
 463         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 464                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 465                 status = -EFAULT;
 466                 goto err;
 467         }
 468
 469         *levels = obj;
 470
 471         return 0;
 472
 473       err:
 474         kfree(buffer.pointer);
 475
 476         return status;
 477 }
 478
 479 static int
 480 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 481 {
 482         int status = AE_OK;
 483         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 484         struct acpi_object_list args = { 1, &arg0 };
 485
 486
 487         arg0.integer.value = level;
 488
 489         if (device->cap._BCM)
 490                 status = acpi_evaluate_object(device->dev->handle, "_BCM",
 491                                               &args, NULL);
 492         device->brightness->curr = level;
 493         return status;
 494 }
 495
 496 static int
 497 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 498                                         unsigned long *level)
 499 {
 500         if (device->cap._BQC)
 501                 return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
 502                                              level);
 503         *level = device->brightness->curr;
 504         return AE_OK;
 505 }
 506
 507 static int
 508 acpi_video_device_EDID(struct acpi_video_device *device,
 509                        union acpi_object **edid, ssize_t length)
 510 {
 511         int status;
 512         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 513         union acpi_object *obj;
 514         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 515         struct acpi_object_list args = { 1, &arg0 };
 516
 517
 518         *edid = NULL;
 519
 520         if (!device)
 521                 return -ENODEV;
 522         if (length == 128)
 523                 arg0.integer.value = 1;
 524         else if (length == 256)
 525                 arg0.integer.value = 2;
 526         else
 527                 return -EINVAL;
 528
 529         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 530         if (ACPI_FAILURE(status))
 531                 return -ENODEV;
 532
 533         obj = buffer.pointer;
 534
 535         if (obj && obj->type == ACPI_TYPE_BUFFER)
 536                 *edid = obj;
 537         else {
 538                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 539                 status = -EFAULT;
 540                 kfree(obj);
 541         }
 542
 543         return status;
 544 }
 545
 546 /* bus */
 547
 548 static int
 549 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 550 {
 551         int status;
 552         unsigned long tmp;
 553         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 554         struct acpi_object_list args = { 1, &arg0 };
 555
 556
 557         arg0.integer.value = option;
 558
 559         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 560         if (ACPI_SUCCESS(status))
 561                 status = tmp ? (-EINVAL) : (AE_OK);
 562
 563         return status;
 564 }
 565
 566 static int
 567 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
 568 {
 569         int status;
 570
 571         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 572
 573         return status;
 574 }
 575
 576 static int
 577 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 578                             unsigned long *options)
 579 {
 580         int status;
 581
 582         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 583         *options &= 3;
 584
 585         return status;
 586 }
 587
 588 /*
 589  *  Arg:
 590  *      video           : video bus device pointer
 591  *      bios_flag       :
 592  *              0.      The system BIOS should NOT automatically switch(toggle)
 593  *                      the active display output.
 594  *              1.      The system BIOS should automatically switch (toggle) the
 595  *                      active display output. No switch event.
 596  *              2.      The _DGS value should be locked.
 597  *              3.      The system BIOS should not automatically switch (toggle) the
 598  *                      active display output, but instead generate the display switch
 599  *                      event notify code.
 600  *      lcd_flag        :
 601  *              0.      The system BIOS should automatically control the brightness level
 602  *                      of the LCD when the power changes from AC to DC
 603  *              1.      The system BIOS should NOT automatically control the brightness
 604  *                      level of the LCD when the power changes from AC to DC.
 605  * Return Value:
 606  *              -1      wrong arg.
 607  */
 608
 609 static int
 610 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 611 {
 612         acpi_integer status = 0;
 613         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 614         struct acpi_object_list args = { 1, &arg0 };
 615
 616
 617         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 618                 status = -1;
 619                 goto Failed;
 620         }
 621         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 622         video->dos_setting = arg0.integer.value;
 623         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 624
 625       Failed:
 626         return status;
 627 }
 628
 629 /*
 630  *  Arg:
 631  *      device  : video output device (LCD, CRT, ..)
 632  *
 633  *  Return Value:
 634  *      Maximum brightness level
 635  *
 636  *  Allocate and initialize device->brightness.
 637  */
 638
 639 static int
 640 acpi_video_init_brightness(struct acpi_video_device *device)
 641 {
 642         union acpi_object *obj = NULL;
 643         int i, max_level = 0, count = 0;
 644         union acpi_object *o;
 645         struct acpi_video_device_brightness *br = NULL;
 646
 647         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 648                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 649                                                 "LCD brightness level\n"));
 650                 goto out;
 651         }
 652
 653         if (obj->package.count < 2)
 654                 goto out;
 655
 656         br = kzalloc(sizeof(*br), GFP_KERNEL);
 657         if (!br) {
 658                 printk(KERN_ERR "can't allocate memory\n");
 659                 goto out;
 660         }
 661
 662         br->levels = kmalloc(obj->package.count * sizeof *(br->levels),
 663                                 GFP_KERNEL);
 664         if (!br->levels)
 665                 goto out_free;
 666
 667         for (i = 0; i < obj->package.count; i++) {
 668                 o = (union acpi_object *)&obj->package.elements[i];
 669                 if (o->type != ACPI_TYPE_INTEGER) {
 670                         printk(KERN_ERR PREFIX "Invalid data\n");
 671                         continue;
 672                 }
 673                 br->levels[count] = (u32) o->integer.value;
 674
 675                 if (br->levels[count] > max_level)
 676                         max_level = br->levels[count];
 677                 count++;
 678         }
 679
 680         if (count < 2)
 681                 goto out_free_levels;
 682
 683         br->count = count;
 684         device->brightness = br;
 685         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "found %d brightness levels\n", count));
 686         kfree(obj);
 687         return max_level;
 688
 689 out_free_levels:
 690         kfree(br->levels);
 691 out_free:
 692         kfree(br);
 693 out:
 694         device->brightness = NULL;
 695         kfree(obj);
 696         return 0;
 697 }
 698
 699 /*
 700  *  Arg:
 701  *      device  : video output device (LCD, CRT, ..)
 702  *
 703  *  Return Value:
 704  *      None
 705  *
 706  *  Find out all required AML methods defined under the output
 707  *  device.
 708  */
 709
 710 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 711 {
 712         acpi_handle h_dummy1;
 713         u32 max_level = 0;
 714
 715
 716         memset(&device->cap, 0, sizeof(device->cap));
 717
 718         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 719                 device->cap._ADR = 1;
 720         }
 721         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 722                 device->cap._BCL = 1;
 723         }
 724         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 725                 device->cap._BCM = 1;
 726         }
 727         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 728                 device->cap._BQC = 1;
 729         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 730                 device->cap._DDC = 1;
 731         }
 732         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 733                 device->cap._DCS = 1;
 734         }
 735         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 736                 device->cap._DGS = 1;
 737         }
 738         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 739                 device->cap._DSS = 1;
 740         }
 741
 742         max_level = acpi_video_init_brightness(device);
 743
 744         if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
 745                 int result;
 746                 static int count = 0;
 747                 char *name;
 748                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 749                 if (!name)
 750                         return;
 751
 752                 sprintf(name, "acpi_video%d", count++);
 753                 device->backlight = backlight_device_register(name,
 754                         NULL, device, &acpi_backlight_ops);
 755                 device->backlight->props.max_brightness = device->brightness->count-3;
 756                 device->backlight->props.brightness = acpi_video_get_brightness(device->backlight);
 757                 backlight_update_status(device->backlight);
 758                 kfree(name);
 759
 760                 device->cdev = thermal_cooling_device_register("LCD",
 761                                         device->dev, &video_cooling_ops);
 762                 if (IS_ERR(device->cdev))
 763                         return;
 764
 765                 printk(KERN_INFO PREFIX
 766                         "%s is registered as cooling_device%d\n",
 767                         device->dev->dev.bus_id, device->cdev->id);
 768                 result = sysfs_create_link(&device->dev->dev.kobj,
 769                                 &device->cdev->device.kobj,
 770                                 "thermal_cooling");
 771                 if (result)
 772                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 773                 result = sysfs_create_link(&device->cdev->device.kobj,
 774                                 &device->dev->dev.kobj, "device");
 775                 if (result)
 776                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 777
 778         }
 779         if (device->cap._DCS && device->cap._DSS){
 780                 static int count = 0;
 781                 char *name;
 782                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 783                 if (!name)
 784                         return;
 785                 sprintf(name, "acpi_video%d", count++);
 786                 device->output_dev = video_output_register(name,
 787                                 NULL, device, &acpi_output_properties);
 788                 kfree(name);
 789         }
 790         return;
 791 }
 792
 793 /*
 794  *  Arg:
 795  *      device  : video output device (VGA)
 796  *
 797  *  Return Value:
 798  *      None
 799  *
 800  *  Find out all required AML methods defined under the video bus device.
 801  */
 802
 803 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 804 {
 805         acpi_handle h_dummy1;
 806
 807         memset(&video->cap, 0, sizeof(video->cap));
 808         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 809                 video->cap._DOS = 1;
 810         }
 811         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 812                 video->cap._DOD = 1;
 813         }
 814         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 815                 video->cap._ROM = 1;
 816         }
 817         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 818                 video->cap._GPD = 1;
 819         }
 820         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 821                 video->cap._SPD = 1;
 822         }
 823         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 824                 video->cap._VPO = 1;
 825         }
 826 }
 827
 828 /*
 829  * Check whether the video bus device has required AML method to
 830  * support the desired features
 831  */
 832
 833 static int acpi_video_bus_check(struct acpi_video_bus *video)
 834 {
 835         acpi_status status = -ENOENT;
 836
 837
 838         if (!video)
 839                 return -EINVAL;
 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, *device_dir;
1080         struct acpi_video_device *vid_dev;
1081
1082         vid_dev = acpi_driver_data(device);
1083         if (!vid_dev)
1084                 return -ENODEV;
1085
1086         device_dir = proc_mkdir(acpi_device_bid(device),
1087                                 vid_dev->video->dir);
1088         if (!device_dir)
1089                 return -ENOMEM;
1090
1091         device_dir->owner = THIS_MODULE;
1092
1093         /* 'info' [R] */
1094         entry = proc_create_data("info", S_IRUGO, device_dir,
1095                         &acpi_video_device_info_fops, acpi_driver_data(device));
1096         if (!entry)
1097                 goto err_remove_dir;
1098
1099         /* 'state' [R/W] */
1100         acpi_video_device_state_fops.write = acpi_video_device_write_state;
1101         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1102                                  device_dir,
1103                                  &acpi_video_device_state_fops,
1104                                  acpi_driver_data(device));
1105         if (!entry)
1106                 goto err_remove_info;
1107
1108         /* 'brightness' [R/W] */
1109         acpi_video_device_brightness_fops.write =
1110                 acpi_video_device_write_brightness;
1111         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1112                                  device_dir,
1113                                  &acpi_video_device_brightness_fops,
1114                                  acpi_driver_data(device));
1115         if (!entry)
1116                 goto err_remove_state;
1117
1118         /* 'EDID' [R] */
1119         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1120                                  &acpi_video_device_EDID_fops,
1121                                  acpi_driver_data(device));
1122         if (!entry)
1123                 goto err_remove_brightness;
1124
1125         acpi_device_dir(device) = device_dir;
1126
1127         return 0;
1128
1129  err_remove_brightness:
1130         remove_proc_entry("brightness", device_dir);
1131  err_remove_state:
1132         remove_proc_entry("state", device_dir);
1133  err_remove_info:
1134         remove_proc_entry("info", device_dir);
1135  err_remove_dir:
1136         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1137         return -ENOMEM;
1138 }
1139
1140 static int acpi_video_device_remove_fs(struct acpi_device *device)
1141 {
1142         struct acpi_video_device *vid_dev;
1143         struct proc_dir_entry *device_dir;
1144
1145         vid_dev = acpi_driver_data(device);
1146         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1147                 return -ENODEV;
1148
1149         device_dir = acpi_device_dir(device);
1150         if (device_dir) {
1151                 remove_proc_entry("info", device_dir);
1152                 remove_proc_entry("state", device_dir);
1153                 remove_proc_entry("brightness", device_dir);
1154                 remove_proc_entry("EDID", device_dir);
1155                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1156                 acpi_device_dir(device) = NULL;
1157         }
1158
1159         return 0;
1160 }
1161
1162 /* video bus */
1163 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1164 {
1165         struct acpi_video_bus *video = seq->private;
1166
1167
1168         if (!video)
1169                 goto end;
1170
1171         seq_printf(seq, "Switching heads:              %s\n",
1172                    video->flags.multihead ? "yes" : "no");
1173         seq_printf(seq, "Video ROM:                    %s\n",
1174                    video->flags.rom ? "yes" : "no");
1175         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1176                    video->flags.post ? "yes" : "no");
1177
1178       end:
1179         return 0;
1180 }
1181
1182 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1183 {
1184         return single_open(file, acpi_video_bus_info_seq_show,
1185                            PDE(inode)->data);
1186 }
1187
1188 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1189 {
1190         struct acpi_video_bus *video = seq->private;
1191
1192
1193         if (!video)
1194                 goto end;
1195
1196         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1197         seq_printf(seq, "<TODO>\n");
1198
1199       end:
1200         return 0;
1201 }
1202
1203 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1204 {
1205         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1206 }
1207
1208 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1209 {
1210         struct acpi_video_bus *video = seq->private;
1211         unsigned long options;
1212         int status;
1213
1214
1215         if (!video)
1216                 goto end;
1217
1218         status = acpi_video_bus_POST_options(video, &options);
1219         if (ACPI_SUCCESS(status)) {
1220                 if (!(options & 1)) {
1221                         printk(KERN_WARNING PREFIX
1222                                "The motherboard VGA device is not listed as a possible POST device.\n");
1223                         printk(KERN_WARNING PREFIX
1224                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1225                 }
1226                 printk("%lx\n", options);
1227                 seq_printf(seq, "can POST: <integrated video>");
1228                 if (options & 2)
1229                         seq_printf(seq, " <PCI video>");
1230                 if (options & 4)
1231                         seq_printf(seq, " <AGP video>");
1232                 seq_putc(seq, '\n');
1233         } else
1234                 seq_printf(seq, "<not supported>\n");
1235       end:
1236         return 0;
1237 }
1238
1239 static int
1240 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1241 {
1242         return single_open(file, acpi_video_bus_POST_info_seq_show,
1243                            PDE(inode)->data);
1244 }
1245
1246 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1247 {
1248         struct acpi_video_bus *video = seq->private;
1249         int status;
1250         unsigned long id;
1251
1252
1253         if (!video)
1254                 goto end;
1255
1256         status = acpi_video_bus_get_POST(video, &id);
1257         if (!ACPI_SUCCESS(status)) {
1258                 seq_printf(seq, "<not supported>\n");
1259                 goto end;
1260         }
1261         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1262
1263       end:
1264         return 0;
1265 }
1266
1267 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1268 {
1269         struct acpi_video_bus *video = seq->private;
1270
1271
1272         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1273
1274         return 0;
1275 }
1276
1277 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1278 {
1279         return single_open(file, acpi_video_bus_POST_seq_show,
1280                            PDE(inode)->data);
1281 }
1282
1283 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1284 {
1285         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1286 }
1287
1288 static ssize_t
1289 acpi_video_bus_write_POST(struct file *file,
1290                           const char __user * buffer,
1291                           size_t count, loff_t * data)
1292 {
1293         int status;
1294         struct seq_file *m = file->private_data;
1295         struct acpi_video_bus *video = m->private;
1296         char str[12] = { 0 };
1297         unsigned long opt, options;
1298
1299
1300         if (!video || count + 1 > sizeof str)
1301                 return -EINVAL;
1302
1303         status = acpi_video_bus_POST_options(video, &options);
1304         if (!ACPI_SUCCESS(status))
1305                 return -EINVAL;
1306
1307         if (copy_from_user(str, buffer, count))
1308                 return -EFAULT;
1309
1310         str[count] = 0;
1311         opt = strtoul(str, NULL, 0);
1312         if (opt > 3)
1313                 return -EFAULT;
1314
1315         /* just in case an OEM 'forgot' the motherboard... */
1316         options |= 1;
1317
1318         if (options & (1ul << opt)) {
1319                 status = acpi_video_bus_set_POST(video, opt);
1320                 if (!ACPI_SUCCESS(status))
1321                         return -EFAULT;
1322
1323         }
1324
1325         return count;
1326 }
1327
1328 static ssize_t
1329 acpi_video_bus_write_DOS(struct file *file,
1330                          const char __user * buffer,
1331                          size_t count, loff_t * data)
1332 {
1333         int status;
1334         struct seq_file *m = file->private_data;
1335         struct acpi_video_bus *video = m->private;
1336         char str[12] = { 0 };
1337         unsigned long opt;
1338
1339
1340         if (!video || count + 1 > sizeof str)
1341                 return -EINVAL;
1342
1343         if (copy_from_user(str, buffer, count))
1344                 return -EFAULT;
1345
1346         str[count] = 0;
1347         opt = strtoul(str, NULL, 0);
1348         if (opt > 7)
1349                 return -EFAULT;
1350
1351         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1352
1353         if (!ACPI_SUCCESS(status))
1354                 return -EFAULT;
1355
1356         return count;
1357 }
1358
1359 static int acpi_video_bus_add_fs(struct acpi_device *device)
1360 {
1361         struct acpi_video_bus *video = acpi_driver_data(device);
1362         struct proc_dir_entry *device_dir;
1363         struct proc_dir_entry *entry;
1364
1365         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1366         if (!device_dir)
1367                 return -ENOMEM;
1368
1369         device_dir->owner = THIS_MODULE;
1370
1371         /* 'info' [R] */
1372         entry = proc_create_data("info", S_IRUGO, device_dir,
1373                                  &acpi_video_bus_info_fops,
1374                                  acpi_driver_data(device));
1375         if (!entry)
1376                 goto err_remove_dir;
1377
1378         /* 'ROM' [R] */
1379         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1380                                  &acpi_video_bus_ROM_fops,
1381                                  acpi_driver_data(device));
1382         if (!entry)
1383                 goto err_remove_info;
1384
1385         /* 'POST_info' [R] */
1386         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1387                                  &acpi_video_bus_POST_info_fops,
1388                                  acpi_driver_data(device));
1389         if (!entry)
1390                 goto err_remove_rom;
1391
1392         /* 'POST' [R/W] */
1393         acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1394         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1395                                  device_dir,
1396                                  &acpi_video_bus_POST_fops,
1397                                  acpi_driver_data(device));
1398         if (!entry)
1399                 goto err_remove_post_info;
1400
1401         /* 'DOS' [R/W] */
1402         acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1403         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1404                                  device_dir,
1405                                  &acpi_video_bus_DOS_fops,
1406                                  acpi_driver_data(device));
1407         if (!entry)
1408                 goto err_remove_post;
1409
1410         video->dir = acpi_device_dir(device) = device_dir;
1411         return 0;
1412
1413  err_remove_post:
1414         remove_proc_entry("POST", device_dir);
1415  err_remove_post_info:
1416         remove_proc_entry("POST_info", device_dir);
1417  err_remove_rom:
1418         remove_proc_entry("ROM", device_dir);
1419  err_remove_info:
1420         remove_proc_entry("info", device_dir);
1421  err_remove_dir:
1422         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1423         return -ENOMEM;
1424 }
1425
1426 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1427 {
1428         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1429
1430         if (device_dir) {
1431                 remove_proc_entry("info", device_dir);
1432                 remove_proc_entry("ROM", device_dir);
1433                 remove_proc_entry("POST_info", device_dir);
1434                 remove_proc_entry("POST", device_dir);
1435                 remove_proc_entry("DOS", device_dir);
1436                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1437                 acpi_device_dir(device) = NULL;
1438         }
1439
1440         return 0;
1441 }
1442
1443 /* --------------------------------------------------------------------------
1444                                  Driver Interface
1445    -------------------------------------------------------------------------- */
1446
1447 /* device interface */
1448 static struct acpi_video_device_attrib*
1449 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1450 {
1451         struct acpi_video_enumerated_device *ids;
1452         int i;
1453
1454         for (i = 0; i < video->attached_count; i++) {
1455                 ids = &video->attached_array[i];
1456                 if ((ids->value.int_val & 0xffff) == device_id)
1457                         return &ids->value.attrib;
1458         }
1459
1460         return NULL;
1461 }
1462
1463 static int
1464 acpi_video_bus_get_one_device(struct acpi_device *device,
1465                               struct acpi_video_bus *video)
1466 {
1467         unsigned long device_id;
1468         int status;
1469         struct acpi_video_device *data;
1470         struct acpi_video_device_attrib* attribute;
1471
1472         if (!device || !video)
1473                 return -EINVAL;
1474
1475         status =
1476             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1477         if (ACPI_SUCCESS(status)) {
1478
1479                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1480                 if (!data)
1481                         return -ENOMEM;
1482
1483                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1484                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1485                 acpi_driver_data(device) = data;
1486
1487                 data->device_id = device_id;
1488                 data->video = video;
1489                 data->dev = device;
1490
1491                 attribute = acpi_video_get_device_attr(video, device_id);
1492
1493                 if((attribute != NULL) && attribute->device_id_scheme) {
1494                         switch (attribute->display_type) {
1495                         case ACPI_VIDEO_DISPLAY_CRT:
1496                                 data->flags.crt = 1;
1497                                 break;
1498                         case ACPI_VIDEO_DISPLAY_TV:
1499                                 data->flags.tvout = 1;
1500                                 break;
1501                         case ACPI_VIDEO_DISPLAY_DVI:
1502                                 data->flags.dvi = 1;
1503                                 break;
1504                         case ACPI_VIDEO_DISPLAY_LCD:
1505                                 data->flags.lcd = 1;
1506                                 break;
1507                         default:
1508                                 data->flags.unknown = 1;
1509                                 break;
1510                         }
1511                         if(attribute->bios_can_detect)
1512                                 data->flags.bios = 1;
1513                 } else
1514                         data->flags.unknown = 1;
1515
1516                 acpi_video_device_bind(video, data);
1517                 acpi_video_device_find_cap(data);
1518
1519                 status = acpi_install_notify_handler(device->handle,
1520                                                      ACPI_DEVICE_NOTIFY,
1521                                                      acpi_video_device_notify,
1522                                                      data);
1523                 if (ACPI_FAILURE(status)) {
1524                         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1525                                           "Error installing notify handler\n"));
1526                         if(data->brightness)
1527                                 kfree(data->brightness->levels);
1528                         kfree(data->brightness);
1529                         kfree(data);
1530                         return -ENODEV;
1531                 }
1532
1533                 mutex_lock(&video->device_list_lock);
1534                 list_add_tail(&data->entry, &video->video_device_list);
1535                 mutex_unlock(&video->device_list_lock);
1536
1537                 acpi_video_device_add_fs(device);
1538
1539                 return 0;
1540         }
1541
1542         return -ENOENT;
1543 }
1544
1545 /*
1546  *  Arg:
1547  *      video   : video bus device
1548  *
1549  *  Return:
1550  *      none
1551  *
1552  *  Enumerate the video device list of the video bus,
1553  *  bind the ids with the corresponding video devices
1554  *  under the video bus.
1555  */
1556
1557 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1558 {
1559         struct acpi_video_device *dev;
1560
1561         mutex_lock(&video->device_list_lock);
1562
1563         list_for_each_entry(dev, &video->video_device_list, entry)
1564                 acpi_video_device_bind(video, dev);
1565
1566         mutex_unlock(&video->device_list_lock);
1567 }
1568
1569 /*
1570  *  Arg:
1571  *      video   : video bus device
1572  *      device  : video output device under the video
1573  *              bus
1574  *
1575  *  Return:
1576  *      none
1577  *
1578  *  Bind the ids with the corresponding video devices
1579  *  under the video bus.
1580  */
1581
1582 static void
1583 acpi_video_device_bind(struct acpi_video_bus *video,
1584                        struct acpi_video_device *device)
1585 {
1586         struct acpi_video_enumerated_device *ids;
1587         int i;
1588
1589         for (i = 0; i < video->attached_count; i++) {
1590                 ids = &video->attached_array[i];
1591                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1592                         ids->bind_info = device;
1593                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1594                 }
1595         }
1596 }
1597
1598 /*
1599  *  Arg:
1600  *      video   : video bus device
1601  *
1602  *  Return:
1603  *      < 0     : error
1604  *
1605  *  Call _DOD to enumerate all devices attached to display adapter
1606  *
1607  */
1608
1609 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1610 {
1611         int status;
1612         int count;
1613         int i;
1614         struct acpi_video_enumerated_device *active_list;
1615         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1616         union acpi_object *dod = NULL;
1617         union acpi_object *obj;
1618
1619         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1620         if (!ACPI_SUCCESS(status)) {
1621                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1622                 return status;
1623         }
1624
1625         dod = buffer.pointer;
1626         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1627                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1628                 status = -EFAULT;
1629                 goto out;
1630         }
1631
1632         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1633                           dod->package.count));
1634
1635         active_list = kcalloc(1 + dod->package.count,
1636                               sizeof(struct acpi_video_enumerated_device),
1637                               GFP_KERNEL);
1638         if (!active_list) {
1639                 status = -ENOMEM;
1640                 goto out;
1641         }
1642
1643         count = 0;
1644         for (i = 0; i < dod->package.count; i++) {
1645                 obj = &dod->package.elements[i];
1646
1647                 if (obj->type != ACPI_TYPE_INTEGER) {
1648                         printk(KERN_ERR PREFIX
1649                                 "Invalid _DOD data in element %d\n", i);
1650                         continue;
1651                 }
1652
1653                 active_list[count].value.int_val = obj->integer.value;
1654                 active_list[count].bind_info = NULL;
1655                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1656                                   (int)obj->integer.value));
1657                 count++;
1658         }
1659
1660         kfree(video->attached_array);
1661
1662         video->attached_array = active_list;
1663         video->attached_count = count;
1664
1665  out:
1666         kfree(buffer.pointer);
1667         return status;
1668 }
1669
1670 static int
1671 acpi_video_get_next_level(struct acpi_video_device *device,
1672                           u32 level_current, u32 event)
1673 {
1674         int min, max, min_above, max_below, i, l, delta = 255;
1675         max = max_below = 0;
1676         min = min_above = 255;
1677         /* Find closest level to level_current */
1678         for (i = 0; i < device->brightness->count; i++) {
1679                 l = device->brightness->levels[i];
1680                 if (abs(l - level_current) < abs(delta)) {
1681                         delta = l - level_current;
1682                         if (!delta)
1683                                 break;
1684                 }
1685         }
1686         /* Ajust level_current to closest available level */
1687         level_current += delta;
1688         for (i = 0; i < device->brightness->count; i++) {
1689                 l = device->brightness->levels[i];
1690                 if (l < min)
1691                         min = l;
1692                 if (l > max)
1693                         max = l;
1694                 if (l < min_above && l > level_current)
1695                         min_above = l;
1696                 if (l > max_below && l < level_current)
1697                         max_below = l;
1698         }
1699
1700         switch (event) {
1701         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1702                 return (level_current < max) ? min_above : min;
1703         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1704                 return (level_current < max) ? min_above : max;
1705         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1706                 return (level_current > min) ? max_below : min;
1707         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1708         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1709                 return 0;
1710         default:
1711                 return level_current;
1712         }
1713 }
1714
1715 static void
1716 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1717 {
1718         unsigned long level_current, level_next;
1719         if (!device->brightness)
1720                 return;
1721         acpi_video_device_lcd_get_level_current(device, &level_current);
1722         level_next = acpi_video_get_next_level(device, level_current, event);
1723         acpi_video_device_lcd_set_level(device, level_next);
1724 }
1725
1726 static int
1727 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1728                            struct acpi_device *device)
1729 {
1730         int status = 0;
1731         struct acpi_device *dev;
1732
1733         acpi_video_device_enumerate(video);
1734
1735         list_for_each_entry(dev, &device->children, node) {
1736
1737                 status = acpi_video_bus_get_one_device(dev, video);
1738                 if (ACPI_FAILURE(status)) {
1739                         ACPI_DEBUG_PRINT((ACPI_DB_WARN,
1740                                         "Cant attach device"));
1741                         continue;
1742                 }
1743         }
1744         return status;
1745 }
1746
1747 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1748 {
1749         acpi_status status;
1750         struct acpi_video_bus *video;
1751
1752
1753         if (!device || !device->video)
1754                 return -ENOENT;
1755
1756         video = device->video;
1757
1758         acpi_video_device_remove_fs(device->dev);
1759
1760         status = acpi_remove_notify_handler(device->dev->handle,
1761                                             ACPI_DEVICE_NOTIFY,
1762                                             acpi_video_device_notify);
1763         backlight_device_unregister(device->backlight);
1764         if (device->cdev) {
1765                 sysfs_remove_link(&device->dev->dev.kobj,
1766                                   "thermal_cooling");
1767                 sysfs_remove_link(&device->cdev->device.kobj,
1768                                   "device");
1769                 thermal_cooling_device_unregister(device->cdev);
1770                 device->cdev = NULL;
1771         }
1772         video_output_unregister(device->output_dev);
1773
1774         return 0;
1775 }
1776
1777 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1778 {
1779         int status;
1780         struct acpi_video_device *dev, *next;
1781
1782         mutex_lock(&video->device_list_lock);
1783
1784         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1785
1786                 status = acpi_video_bus_put_one_device(dev);
1787                 if (ACPI_FAILURE(status))
1788                         printk(KERN_WARNING PREFIX
1789                                "hhuuhhuu bug in acpi video driver.\n");
1790
1791                 if (dev->brightness) {
1792                         kfree(dev->brightness->levels);
1793                         kfree(dev->brightness);
1794                 }
1795                 list_del(&dev->entry);
1796                 kfree(dev);
1797         }
1798
1799         mutex_unlock(&video->device_list_lock);
1800
1801         return 0;
1802 }
1803
1804 /* acpi_video interface */
1805
1806 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1807 {
1808         return acpi_video_bus_DOS(video, 0, 0);
1809 }
1810
1811 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1812 {
1813         return acpi_video_bus_DOS(video, 0, 1);
1814 }
1815
1816 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1817 {
1818         struct acpi_video_bus *video = data;
1819         struct acpi_device *device = NULL;
1820         struct input_dev *input;
1821         int keycode;
1822
1823         if (!video)
1824                 return;
1825
1826         device = video->device;
1827         input = video->input;
1828
1829         switch (event) {
1830         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1831                                          * most likely via hotkey. */
1832                 acpi_bus_generate_proc_event(device, event, 0);
1833                 keycode = KEY_SWITCHVIDEOMODE;
1834                 break;
1835
1836         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1837                                          * connector. */
1838                 acpi_video_device_enumerate(video);
1839                 acpi_video_device_rebind(video);
1840                 acpi_bus_generate_proc_event(device, event, 0);
1841                 keycode = KEY_SWITCHVIDEOMODE;
1842                 break;
1843
1844         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1845                 acpi_bus_generate_proc_event(device, event, 0);
1846                 keycode = KEY_SWITCHVIDEOMODE;
1847                 break;
1848         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1849                 acpi_bus_generate_proc_event(device, event, 0);
1850                 keycode = KEY_VIDEO_NEXT;
1851                 break;
1852         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1853                 acpi_bus_generate_proc_event(device, event, 0);
1854                 keycode = KEY_VIDEO_PREV;
1855                 break;
1856
1857         default:
1858                 keycode = KEY_UNKNOWN;
1859                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1860                                   "Unsupported event [0x%x]\n", event));
1861                 break;
1862         }
1863
1864         acpi_notifier_call_chain(device, event, 0);
1865         input_report_key(input, keycode, 1);
1866         input_sync(input);
1867         input_report_key(input, keycode, 0);
1868         input_sync(input);
1869
1870         return;
1871 }
1872
1873 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1874 {
1875         struct acpi_video_device *video_device = data;
1876         struct acpi_device *device = NULL;
1877         struct acpi_video_bus *bus;
1878         struct input_dev *input;
1879         int keycode;
1880
1881         if (!video_device)
1882                 return;
1883
1884         device = video_device->dev;
1885         bus = video_device->video;
1886         input = bus->input;
1887
1888         switch (event) {
1889         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1890                 if (brightness_switch_enabled)
1891                         acpi_video_switch_brightness(video_device, event);
1892                 acpi_bus_generate_proc_event(device, event, 0);
1893                 keycode = KEY_BRIGHTNESS_CYCLE;
1894                 break;
1895         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1896                 if (brightness_switch_enabled)
1897                         acpi_video_switch_brightness(video_device, event);
1898                 acpi_bus_generate_proc_event(device, event, 0);
1899                 keycode = KEY_BRIGHTNESSUP;
1900                 break;
1901         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1902                 if (brightness_switch_enabled)
1903                         acpi_video_switch_brightness(video_device, event);
1904                 acpi_bus_generate_proc_event(device, event, 0);
1905                 keycode = KEY_BRIGHTNESSDOWN;
1906                 break;
1907         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1908                 if (brightness_switch_enabled)
1909                         acpi_video_switch_brightness(video_device, event);
1910                 acpi_bus_generate_proc_event(device, event, 0);
1911                 keycode = KEY_BRIGHTNESS_ZERO;
1912                 break;
1913         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1914                 if (brightness_switch_enabled)
1915                         acpi_video_switch_brightness(video_device, event);
1916                 acpi_bus_generate_proc_event(device, event, 0);
1917                 keycode = KEY_DISPLAY_OFF;
1918                 break;
1919         default:
1920                 keycode = KEY_UNKNOWN;
1921                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1922                                   "Unsupported event [0x%x]\n", event));
1923                 break;
1924         }
1925
1926         acpi_notifier_call_chain(device, event, 0);
1927         input_report_key(input, keycode, 1);
1928         input_sync(input);
1929         input_report_key(input, keycode, 0);
1930         input_sync(input);
1931
1932         return;
1933 }
1934
1935 static int instance;
1936 static int acpi_video_resume(struct acpi_device *device)
1937 {
1938         struct acpi_video_bus *video;
1939         struct acpi_video_device *video_device;
1940         int i;
1941
1942         if (!device || !acpi_driver_data(device))
1943                 return -EINVAL;
1944
1945         video = acpi_driver_data(device);
1946
1947         for (i = 0; i < video->attached_count; i++) {
1948                 video_device = video->attached_array[i].bind_info;
1949                 if (video_device && video_device->backlight)
1950                         acpi_video_set_brightness(video_device->backlight);
1951         }
1952         return AE_OK;
1953 }
1954
1955 static int acpi_video_bus_add(struct acpi_device *device)
1956 {
1957         acpi_status status;
1958         struct acpi_video_bus *video;
1959         struct input_dev *input;
1960         int error;
1961
1962         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1963         if (!video)
1964                 return -ENOMEM;
1965
1966         /* a hack to fix the duplicate name "VID" problem on T61 */
1967         if (!strcmp(device->pnp.bus_id, "VID")) {
1968                 if (instance)
1969                         device->pnp.bus_id[3] = '0' + instance;
1970                 instance ++;
1971         }
1972
1973         video->device = device;
1974         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1975         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1976         acpi_driver_data(device) = video;
1977
1978         acpi_video_bus_find_cap(video);
1979         error = acpi_video_bus_check(video);
1980         if (error)
1981                 goto err_free_video;
1982
1983         error = acpi_video_bus_add_fs(device);
1984         if (error)
1985                 goto err_free_video;
1986
1987         mutex_init(&video->device_list_lock);
1988         INIT_LIST_HEAD(&video->video_device_list);
1989
1990         acpi_video_bus_get_devices(video, device);
1991         acpi_video_bus_start_devices(video);
1992
1993         status = acpi_install_notify_handler(device->handle,
1994                                              ACPI_DEVICE_NOTIFY,
1995                                              acpi_video_bus_notify, video);
1996         if (ACPI_FAILURE(status)) {
1997                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1998                                   "Error installing notify handler\n"));
1999                 error = -ENODEV;
2000                 goto err_stop_video;
2001         }
2002
2003         video->input = input = input_allocate_device();
2004         if (!input) {
2005                 error = -ENOMEM;
2006                 goto err_uninstall_notify;
2007         }
2008
2009         snprintf(video->phys, sizeof(video->phys),
2010                 "%s/video/input0", acpi_device_hid(video->device));
2011
2012         input->name = acpi_device_name(video->device);
2013         input->phys = video->phys;
2014         input->id.bustype = BUS_HOST;
2015         input->id.product = 0x06;
2016         input->dev.parent = &device->dev;
2017         input->evbit[0] = BIT(EV_KEY);
2018         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2019         set_bit(KEY_VIDEO_NEXT, input->keybit);
2020         set_bit(KEY_VIDEO_PREV, input->keybit);
2021         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2022         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2023         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2024         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2025         set_bit(KEY_DISPLAY_OFF, input->keybit);
2026         set_bit(KEY_UNKNOWN, input->keybit);
2027
2028         error = input_register_device(input);
2029         if (error)
2030                 goto err_free_input_dev;
2031
2032         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2033                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2034                video->flags.multihead ? "yes" : "no",
2035                video->flags.rom ? "yes" : "no",
2036                video->flags.post ? "yes" : "no");
2037
2038         return 0;
2039
2040  err_free_input_dev:
2041         input_free_device(input);
2042  err_uninstall_notify:
2043         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2044                                    acpi_video_bus_notify);
2045  err_stop_video:
2046         acpi_video_bus_stop_devices(video);
2047         acpi_video_bus_put_devices(video);
2048         kfree(video->attached_array);
2049         acpi_video_bus_remove_fs(device);
2050  err_free_video:
2051         kfree(video);
2052         acpi_driver_data(device) = NULL;
2053
2054         return error;
2055 }
2056
2057 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2058 {
2059         acpi_status status = 0;
2060         struct acpi_video_bus *video = NULL;
2061
2062
2063         if (!device || !acpi_driver_data(device))
2064                 return -EINVAL;
2065
2066         video = acpi_driver_data(device);
2067
2068         acpi_video_bus_stop_devices(video);
2069
2070         status = acpi_remove_notify_handler(video->device->handle,
2071                                             ACPI_DEVICE_NOTIFY,
2072                                             acpi_video_bus_notify);
2073
2074         acpi_video_bus_put_devices(video);
2075         acpi_video_bus_remove_fs(device);
2076
2077         input_unregister_device(video->input);
2078         kfree(video->attached_array);
2079         kfree(video);
2080
2081         return 0;
2082 }
2083
2084 static int __init acpi_video_init(void)
2085 {
2086         int result = 0;
2087
2088
2089         /*
2090            acpi_dbg_level = 0xFFFFFFFF;
2091            acpi_dbg_layer = 0x08000000;
2092          */
2093
2094         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2095         if (!acpi_video_dir)
2096                 return -ENODEV;
2097         acpi_video_dir->owner = THIS_MODULE;
2098
2099         result = acpi_bus_register_driver(&acpi_video_bus);
2100         if (result < 0) {
2101                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2102                 return -ENODEV;
2103         }
2104
2105         return 0;
2106 }
2107
2108 static void __exit acpi_video_exit(void)
2109 {
2110
2111         acpi_bus_unregister_driver(&acpi_video_bus);
2112
2113         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2114
2115         return;
2116 }
2117
2118 module_init(acpi_video_init);
2119 module_exit(acpi_video_exit);