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 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 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         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 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 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 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 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 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         int state;
 486
 487
 488         arg0.integer.value = level;
 489
 490         if (device->cap._BCM)
 491                 status = acpi_evaluate_object(device->dev->handle, "_BCM",
 492                                               &args, NULL);
 493         device->brightness->curr = level;
 494         for (state = 2; state < device->brightness->count; state++)
 495                 if (level == device->brightness->levels[state])
 496                         device->backlight->props.brightness = state - 2;
 497
 498         return status;
 499 }
 500
 501 static int
 502 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 503                                         unsigned long long *level)
 504 {
 505         if (device->cap._BQC)
 506                 return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
 507                                              level);
 508         *level = device->brightness->curr;
 509         return AE_OK;
 510 }
 511
 512 static int
 513 acpi_video_device_EDID(struct acpi_video_device *device,
 514                        union acpi_object **edid, ssize_t length)
 515 {
 516         int status;
 517         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 518         union acpi_object *obj;
 519         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 520         struct acpi_object_list args = { 1, &arg0 };
 521
 522
 523         *edid = NULL;
 524
 525         if (!device)
 526                 return -ENODEV;
 527         if (length == 128)
 528                 arg0.integer.value = 1;
 529         else if (length == 256)
 530                 arg0.integer.value = 2;
 531         else
 532                 return -EINVAL;
 533
 534         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 535         if (ACPI_FAILURE(status))
 536                 return -ENODEV;
 537
 538         obj = buffer.pointer;
 539
 540         if (obj && obj->type == ACPI_TYPE_BUFFER)
 541                 *edid = obj;
 542         else {
 543                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 544                 status = -EFAULT;
 545                 kfree(obj);
 546         }
 547
 548         return status;
 549 }
 550
 551 /* bus */
 552
 553 static int
 554 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 555 {
 556         int status;
 557         unsigned long long tmp;
 558         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 559         struct acpi_object_list args = { 1, &arg0 };
 560
 561
 562         arg0.integer.value = option;
 563
 564         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 565         if (ACPI_SUCCESS(status))
 566                 status = tmp ? (-EINVAL) : (AE_OK);
 567
 568         return status;
 569 }
 570
 571 static int
 572 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
 573 {
 574         int status;
 575
 576         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 577
 578         return status;
 579 }
 580
 581 static int
 582 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 583                             unsigned long long *options)
 584 {
 585         int status;
 586
 587         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 588         *options &= 3;
 589
 590         return status;
 591 }
 592
 593 /*
 594  *  Arg:
 595  *      video           : video bus device pointer
 596  *      bios_flag       :
 597  *              0.      The system BIOS should NOT automatically switch(toggle)
 598  *                      the active display output.
 599  *              1.      The system BIOS should automatically switch (toggle) the
 600  *                      active display output. No switch event.
 601  *              2.      The _DGS value should be locked.
 602  *              3.      The system BIOS should not automatically switch (toggle) the
 603  *                      active display output, but instead generate the display switch
 604  *                      event notify code.
 605  *      lcd_flag        :
 606  *              0.      The system BIOS should automatically control the brightness level
 607  *                      of the LCD when the power changes from AC to DC
 608  *              1.      The system BIOS should NOT automatically control the brightness
 609  *                      level of the LCD when the power changes from AC to DC.
 610  * Return Value:
 611  *              -1      wrong arg.
 612  */
 613
 614 static int
 615 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 616 {
 617         acpi_integer status = 0;
 618         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 619         struct acpi_object_list args = { 1, &arg0 };
 620
 621
 622         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 623                 status = -1;
 624                 goto Failed;
 625         }
 626         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 627         video->dos_setting = arg0.integer.value;
 628         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 629
 630       Failed:
 631         return status;
 632 }
 633
 634 /*
 635  * Simple comparison function used to sort backlight levels.
 636  */
 637
 638 static int
 639 acpi_video_cmp_level(const void *a, const void *b)
 640 {
 641         return *(int *)a - *(int *)b;
 642 }
 643
 644 /*
 645  *  Arg:
 646  *      device  : video output device (LCD, CRT, ..)
 647  *
 648  *  Return Value:
 649  *      Maximum brightness level
 650  *
 651  *  Allocate and initialize device->brightness.
 652  */
 653
 654 static int
 655 acpi_video_init_brightness(struct acpi_video_device *device)
 656 {
 657         union acpi_object *obj = NULL;
 658         int i, max_level = 0, count = 0;
 659         union acpi_object *o;
 660         struct acpi_video_device_brightness *br = NULL;
 661
 662         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 663                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 664                                                 "LCD brightness level\n"));
 665                 goto out;
 666         }
 667
 668         if (obj->package.count < 2)
 669                 goto out;
 670
 671         br = kzalloc(sizeof(*br), GFP_KERNEL);
 672         if (!br) {
 673                 printk(KERN_ERR "can't allocate memory\n");
 674                 goto out;
 675         }
 676
 677         br->levels = kmalloc(obj->package.count * sizeof *(br->levels),
 678                                 GFP_KERNEL);
 679         if (!br->levels)
 680                 goto out_free;
 681
 682         for (i = 0; i < obj->package.count; i++) {
 683                 o = (union acpi_object *)&obj->package.elements[i];
 684                 if (o->type != ACPI_TYPE_INTEGER) {
 685                         printk(KERN_ERR PREFIX "Invalid data\n");
 686                         continue;
 687                 }
 688                 br->levels[count] = (u32) o->integer.value;
 689
 690                 if (br->levels[count] > max_level)
 691                         max_level = br->levels[count];
 692                 count++;
 693         }
 694
 695         /* don't sort the first two brightness levels */
 696         sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 697                 acpi_video_cmp_level, NULL);
 698
 699         if (count < 2)
 700                 goto out_free_levels;
 701
 702         br->count = count;
 703         device->brightness = br;
 704         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "found %d brightness levels\n", count));
 705         kfree(obj);
 706         return max_level;
 707
 708 out_free_levels:
 709         kfree(br->levels);
 710 out_free:
 711         kfree(br);
 712 out:
 713         device->brightness = NULL;
 714         kfree(obj);
 715         return 0;
 716 }
 717
 718 /*
 719  *  Arg:
 720  *      device  : video output device (LCD, CRT, ..)
 721  *
 722  *  Return Value:
 723  *      None
 724  *
 725  *  Find out all required AML methods defined under the output
 726  *  device.
 727  */
 728
 729 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 730 {
 731         acpi_handle h_dummy1;
 732         u32 max_level = 0;
 733
 734
 735         memset(&device->cap, 0, sizeof(device->cap));
 736
 737         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 738                 device->cap._ADR = 1;
 739         }
 740         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 741                 device->cap._BCL = 1;
 742         }
 743         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 744                 device->cap._BCM = 1;
 745         }
 746         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 747                 device->cap._BQC = 1;
 748         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 749                 device->cap._DDC = 1;
 750         }
 751         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 752                 device->cap._DCS = 1;
 753         }
 754         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 755                 device->cap._DGS = 1;
 756         }
 757         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 758                 device->cap._DSS = 1;
 759         }
 760
 761         if (acpi_video_backlight_support())
 762                 max_level = acpi_video_init_brightness(device);
 763
 764         if (device->cap._BCL && device->cap._BCM && max_level > 0) {
 765                 int result;
 766                 static int count = 0;
 767                 char *name;
 768                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 769                 if (!name)
 770                         return;
 771
 772                 sprintf(name, "acpi_video%d", count++);
 773                 device->backlight = backlight_device_register(name,
 774                         NULL, device, &acpi_backlight_ops);
 775                 device->backlight->props.max_brightness = device->brightness->count-3;
 776                 /*
 777                  * If there exists the _BQC object, the _BQC object will be
 778                  * called to get the current backlight brightness. Otherwise
 779                  * the brightness will be set to the maximum.
 780                  */
 781                 if (device->cap._BQC)
 782                         device->backlight->props.brightness =
 783                                 acpi_video_get_brightness(device->backlight);
 784                 else
 785                         device->backlight->props.brightness =
 786                                 device->backlight->props.max_brightness;
 787                 backlight_update_status(device->backlight);
 788                 kfree(name);
 789
 790                 device->cdev = thermal_cooling_device_register("LCD",
 791                                         device->dev, &video_cooling_ops);
 792                 if (IS_ERR(device->cdev))
 793                         return;
 794
 795                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 796                          device->cdev->id);
 797                 result = sysfs_create_link(&device->dev->dev.kobj,
 798                                 &device->cdev->device.kobj,
 799                                 "thermal_cooling");
 800                 if (result)
 801                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 802                 result = sysfs_create_link(&device->cdev->device.kobj,
 803                                 &device->dev->dev.kobj, "device");
 804                 if (result)
 805                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 806
 807         }
 808
 809         if (acpi_video_display_switch_support()) {
 810
 811                 if (device->cap._DCS && device->cap._DSS) {
 812                         static int count;
 813                         char *name;
 814                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 815                         if (!name)
 816                                 return;
 817                         sprintf(name, "acpi_video%d", count++);
 818                         device->output_dev = video_output_register(name,
 819                                         NULL, device, &acpi_output_properties);
 820                         kfree(name);
 821                 }
 822         }
 823 }
 824
 825 /*
 826  *  Arg:
 827  *      device  : video output device (VGA)
 828  *
 829  *  Return Value:
 830  *      None
 831  *
 832  *  Find out all required AML methods defined under the video bus device.
 833  */
 834
 835 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 836 {
 837         acpi_handle h_dummy1;
 838
 839         memset(&video->cap, 0, sizeof(video->cap));
 840         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 841                 video->cap._DOS = 1;
 842         }
 843         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 844                 video->cap._DOD = 1;
 845         }
 846         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 847                 video->cap._ROM = 1;
 848         }
 849         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 850                 video->cap._GPD = 1;
 851         }
 852         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 853                 video->cap._SPD = 1;
 854         }
 855         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 856                 video->cap._VPO = 1;
 857         }
 858 }
 859
 860 /*
 861  * Check whether the video bus device has required AML method to
 862  * support the desired features
 863  */
 864
 865 static int acpi_video_bus_check(struct acpi_video_bus *video)
 866 {
 867         acpi_status status = -ENOENT;
 868         struct device *dev;
 869
 870         if (!video)
 871                 return -EINVAL;
 872
 873         dev = acpi_get_physical_pci_device(video->device->handle);
 874         if (!dev)
 875                 return -ENODEV;
 876         put_device(dev);
 877
 878         /* Since there is no HID, CID and so on for VGA driver, we have
 879          * to check well known required nodes.
 880          */
 881
 882         /* Does this device support video switching? */
 883         if (video->cap._DOS) {
 884                 video->flags.multihead = 1;
 885                 status = 0;
 886         }
 887
 888         /* Does this device support retrieving a video ROM? */
 889         if (video->cap._ROM) {
 890                 video->flags.rom = 1;
 891                 status = 0;
 892         }
 893
 894         /* Does this device support configuring which video device to POST? */
 895         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 896                 video->flags.post = 1;
 897                 status = 0;
 898         }
 899
 900         return status;
 901 }
 902
 903 /* --------------------------------------------------------------------------
 904                               FS Interface (/proc)
 905    -------------------------------------------------------------------------- */
 906
 907 static struct proc_dir_entry *acpi_video_dir;
 908
 909 /* video devices */
 910
 911 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 912 {
 913         struct acpi_video_device *dev = seq->private;
 914
 915
 916         if (!dev)
 917                 goto end;
 918
 919         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 920         seq_printf(seq, "type:         ");
 921         if (dev->flags.crt)
 922                 seq_printf(seq, "CRT\n");
 923         else if (dev->flags.lcd)
 924                 seq_printf(seq, "LCD\n");
 925         else if (dev->flags.tvout)
 926                 seq_printf(seq, "TVOUT\n");
 927         else if (dev->flags.dvi)
 928                 seq_printf(seq, "DVI\n");
 929         else
 930                 seq_printf(seq, "UNKNOWN\n");
 931
 932         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 933
 934       end:
 935         return 0;
 936 }
 937
 938 static int
 939 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 940 {
 941         return single_open(file, acpi_video_device_info_seq_show,
 942                            PDE(inode)->data);
 943 }
 944
 945 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 946 {
 947         int status;
 948         struct acpi_video_device *dev = seq->private;
 949         unsigned long long state;
 950
 951
 952         if (!dev)
 953                 goto end;
 954
 955         status = acpi_video_device_get_state(dev, &state);
 956         seq_printf(seq, "state:     ");
 957         if (ACPI_SUCCESS(status))
 958                 seq_printf(seq, "0x%02llx\n", state);
 959         else
 960                 seq_printf(seq, "<not supported>\n");
 961
 962         status = acpi_video_device_query(dev, &state);
 963         seq_printf(seq, "query:     ");
 964         if (ACPI_SUCCESS(status))
 965                 seq_printf(seq, "0x%02llx\n", state);
 966         else
 967                 seq_printf(seq, "<not supported>\n");
 968
 969       end:
 970         return 0;
 971 }
 972
 973 static int
 974 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 975 {
 976         return single_open(file, acpi_video_device_state_seq_show,
 977                            PDE(inode)->data);
 978 }
 979
 980 static ssize_t
 981 acpi_video_device_write_state(struct file *file,
 982                               const char __user * buffer,
 983                               size_t count, loff_t * data)
 984 {
 985         int status;
 986         struct seq_file *m = file->private_data;
 987         struct acpi_video_device *dev = m->private;
 988         char str[12] = { 0 };
 989         u32 state = 0;
 990
 991
 992         if (!dev || count + 1 > sizeof str)
 993                 return -EINVAL;
 994
 995         if (copy_from_user(str, buffer, count))
 996                 return -EFAULT;
 997
 998         str[count] = 0;
 999         state = simple_strtoul(str, NULL, 0);
1000         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1001
1002         status = acpi_video_device_set_state(dev, state);
1003
1004         if (status)
1005                 return -EFAULT;
1006
1007         return count;
1008 }
1009
1010 static int
1011 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1012 {
1013         struct acpi_video_device *dev = seq->private;
1014         int i;
1015
1016
1017         if (!dev || !dev->brightness) {
1018                 seq_printf(seq, "<not supported>\n");
1019                 return 0;
1020         }
1021
1022         seq_printf(seq, "levels: ");
1023         for (i = 2; i < dev->brightness->count; i++)
1024                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1025         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1026
1027         return 0;
1028 }
1029
1030 static int
1031 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1032 {
1033         return single_open(file, acpi_video_device_brightness_seq_show,
1034                            PDE(inode)->data);
1035 }
1036
1037 static ssize_t
1038 acpi_video_device_write_brightness(struct file *file,
1039                                    const char __user * buffer,
1040                                    size_t count, loff_t * data)
1041 {
1042         struct seq_file *m = file->private_data;
1043         struct acpi_video_device *dev = m->private;
1044         char str[5] = { 0 };
1045         unsigned int level = 0;
1046         int i;
1047
1048
1049         if (!dev || !dev->brightness || count + 1 > sizeof str)
1050                 return -EINVAL;
1051
1052         if (copy_from_user(str, buffer, count))
1053                 return -EFAULT;
1054
1055         str[count] = 0;
1056         level = simple_strtoul(str, NULL, 0);
1057
1058         if (level > 100)
1059                 return -EFAULT;
1060
1061         /* validate through the list of available levels */
1062         for (i = 2; i < dev->brightness->count; i++)
1063                 if (level == dev->brightness->levels[i]) {
1064                         if (ACPI_SUCCESS
1065                             (acpi_video_device_lcd_set_level(dev, level)))
1066                                 dev->brightness->curr = level;
1067                         break;
1068                 }
1069
1070         return count;
1071 }
1072
1073 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1074 {
1075         struct acpi_video_device *dev = seq->private;
1076         int status;
1077         int i;
1078         union acpi_object *edid = NULL;
1079
1080
1081         if (!dev)
1082                 goto out;
1083
1084         status = acpi_video_device_EDID(dev, &edid, 128);
1085         if (ACPI_FAILURE(status)) {
1086                 status = acpi_video_device_EDID(dev, &edid, 256);
1087         }
1088
1089         if (ACPI_FAILURE(status)) {
1090                 goto out;
1091         }
1092
1093         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1094                 for (i = 0; i < edid->buffer.length; i++)
1095                         seq_putc(seq, edid->buffer.pointer[i]);
1096         }
1097
1098       out:
1099         if (!edid)
1100                 seq_printf(seq, "<not supported>\n");
1101         else
1102                 kfree(edid);
1103
1104         return 0;
1105 }
1106
1107 static int
1108 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1109 {
1110         return single_open(file, acpi_video_device_EDID_seq_show,
1111                            PDE(inode)->data);
1112 }
1113
1114 static int acpi_video_device_add_fs(struct acpi_device *device)
1115 {
1116         struct proc_dir_entry *entry, *device_dir;
1117         struct acpi_video_device *vid_dev;
1118
1119         vid_dev = acpi_driver_data(device);
1120         if (!vid_dev)
1121                 return -ENODEV;
1122
1123         device_dir = proc_mkdir(acpi_device_bid(device),
1124                                 vid_dev->video->dir);
1125         if (!device_dir)
1126                 return -ENOMEM;
1127
1128         device_dir->owner = THIS_MODULE;
1129
1130         /* 'info' [R] */
1131         entry = proc_create_data("info", S_IRUGO, device_dir,
1132                         &acpi_video_device_info_fops, acpi_driver_data(device));
1133         if (!entry)
1134                 goto err_remove_dir;
1135
1136         /* 'state' [R/W] */
1137         acpi_video_device_state_fops.write = acpi_video_device_write_state;
1138         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1139                                  device_dir,
1140                                  &acpi_video_device_state_fops,
1141                                  acpi_driver_data(device));
1142         if (!entry)
1143                 goto err_remove_info;
1144
1145         /* 'brightness' [R/W] */
1146         acpi_video_device_brightness_fops.write =
1147                 acpi_video_device_write_brightness;
1148         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1149                                  device_dir,
1150                                  &acpi_video_device_brightness_fops,
1151                                  acpi_driver_data(device));
1152         if (!entry)
1153                 goto err_remove_state;
1154
1155         /* 'EDID' [R] */
1156         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1157                                  &acpi_video_device_EDID_fops,
1158                                  acpi_driver_data(device));
1159         if (!entry)
1160                 goto err_remove_brightness;
1161
1162         acpi_device_dir(device) = device_dir;
1163
1164         return 0;
1165
1166  err_remove_brightness:
1167         remove_proc_entry("brightness", device_dir);
1168  err_remove_state:
1169         remove_proc_entry("state", device_dir);
1170  err_remove_info:
1171         remove_proc_entry("info", device_dir);
1172  err_remove_dir:
1173         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1174         return -ENOMEM;
1175 }
1176
1177 static int acpi_video_device_remove_fs(struct acpi_device *device)
1178 {
1179         struct acpi_video_device *vid_dev;
1180         struct proc_dir_entry *device_dir;
1181
1182         vid_dev = acpi_driver_data(device);
1183         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1184                 return -ENODEV;
1185
1186         device_dir = acpi_device_dir(device);
1187         if (device_dir) {
1188                 remove_proc_entry("info", device_dir);
1189                 remove_proc_entry("state", device_dir);
1190                 remove_proc_entry("brightness", device_dir);
1191                 remove_proc_entry("EDID", device_dir);
1192                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1193                 acpi_device_dir(device) = NULL;
1194         }
1195
1196         return 0;
1197 }
1198
1199 /* video bus */
1200 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1201 {
1202         struct acpi_video_bus *video = seq->private;
1203
1204
1205         if (!video)
1206                 goto end;
1207
1208         seq_printf(seq, "Switching heads:              %s\n",
1209                    video->flags.multihead ? "yes" : "no");
1210         seq_printf(seq, "Video ROM:                    %s\n",
1211                    video->flags.rom ? "yes" : "no");
1212         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1213                    video->flags.post ? "yes" : "no");
1214
1215       end:
1216         return 0;
1217 }
1218
1219 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1220 {
1221         return single_open(file, acpi_video_bus_info_seq_show,
1222                            PDE(inode)->data);
1223 }
1224
1225 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1226 {
1227         struct acpi_video_bus *video = seq->private;
1228
1229
1230         if (!video)
1231                 goto end;
1232
1233         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1234         seq_printf(seq, "<TODO>\n");
1235
1236       end:
1237         return 0;
1238 }
1239
1240 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1241 {
1242         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1243 }
1244
1245 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1246 {
1247         struct acpi_video_bus *video = seq->private;
1248         unsigned long long options;
1249         int status;
1250
1251
1252         if (!video)
1253                 goto end;
1254
1255         status = acpi_video_bus_POST_options(video, &options);
1256         if (ACPI_SUCCESS(status)) {
1257                 if (!(options & 1)) {
1258                         printk(KERN_WARNING PREFIX
1259                                "The motherboard VGA device is not listed as a possible POST device.\n");
1260                         printk(KERN_WARNING PREFIX
1261                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1262                 }
1263                 printk(KERN_WARNING "%llx\n", options);
1264                 seq_printf(seq, "can POST: <integrated video>");
1265                 if (options & 2)
1266                         seq_printf(seq, " <PCI video>");
1267                 if (options & 4)
1268                         seq_printf(seq, " <AGP video>");
1269                 seq_putc(seq, '\n');
1270         } else
1271                 seq_printf(seq, "<not supported>\n");
1272       end:
1273         return 0;
1274 }
1275
1276 static int
1277 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1278 {
1279         return single_open(file, acpi_video_bus_POST_info_seq_show,
1280                            PDE(inode)->data);
1281 }
1282
1283 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1284 {
1285         struct acpi_video_bus *video = seq->private;
1286         int status;
1287         unsigned long long id;
1288
1289
1290         if (!video)
1291                 goto end;
1292
1293         status = acpi_video_bus_get_POST(video, &id);
1294         if (!ACPI_SUCCESS(status)) {
1295                 seq_printf(seq, "<not supported>\n");
1296                 goto end;
1297         }
1298         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1299
1300       end:
1301         return 0;
1302 }
1303
1304 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1305 {
1306         struct acpi_video_bus *video = seq->private;
1307
1308
1309         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1310
1311         return 0;
1312 }
1313
1314 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1315 {
1316         return single_open(file, acpi_video_bus_POST_seq_show,
1317                            PDE(inode)->data);
1318 }
1319
1320 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1321 {
1322         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1323 }
1324
1325 static ssize_t
1326 acpi_video_bus_write_POST(struct file *file,
1327                           const char __user * buffer,
1328                           size_t count, loff_t * data)
1329 {
1330         int status;
1331         struct seq_file *m = file->private_data;
1332         struct acpi_video_bus *video = m->private;
1333         char str[12] = { 0 };
1334         unsigned long long opt, options;
1335
1336
1337         if (!video || count + 1 > sizeof str)
1338                 return -EINVAL;
1339
1340         status = acpi_video_bus_POST_options(video, &options);
1341         if (!ACPI_SUCCESS(status))
1342                 return -EINVAL;
1343
1344         if (copy_from_user(str, buffer, count))
1345                 return -EFAULT;
1346
1347         str[count] = 0;
1348         opt = strtoul(str, NULL, 0);
1349         if (opt > 3)
1350                 return -EFAULT;
1351
1352         /* just in case an OEM 'forgot' the motherboard... */
1353         options |= 1;
1354
1355         if (options & (1ul << opt)) {
1356                 status = acpi_video_bus_set_POST(video, opt);
1357                 if (!ACPI_SUCCESS(status))
1358                         return -EFAULT;
1359
1360         }
1361
1362         return count;
1363 }
1364
1365 static ssize_t
1366 acpi_video_bus_write_DOS(struct file *file,
1367                          const char __user * buffer,
1368                          size_t count, loff_t * data)
1369 {
1370         int status;
1371         struct seq_file *m = file->private_data;
1372         struct acpi_video_bus *video = m->private;
1373         char str[12] = { 0 };
1374         unsigned long opt;
1375
1376
1377         if (!video || count + 1 > sizeof str)
1378                 return -EINVAL;
1379
1380         if (copy_from_user(str, buffer, count))
1381                 return -EFAULT;
1382
1383         str[count] = 0;
1384         opt = strtoul(str, NULL, 0);
1385         if (opt > 7)
1386                 return -EFAULT;
1387
1388         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1389
1390         if (!ACPI_SUCCESS(status))
1391                 return -EFAULT;
1392
1393         return count;
1394 }
1395
1396 static int acpi_video_bus_add_fs(struct acpi_device *device)
1397 {
1398         struct acpi_video_bus *video = acpi_driver_data(device);
1399         struct proc_dir_entry *device_dir;
1400         struct proc_dir_entry *entry;
1401
1402         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1403         if (!device_dir)
1404                 return -ENOMEM;
1405
1406         device_dir->owner = THIS_MODULE;
1407
1408         /* 'info' [R] */
1409         entry = proc_create_data("info", S_IRUGO, device_dir,
1410                                  &acpi_video_bus_info_fops,
1411                                  acpi_driver_data(device));
1412         if (!entry)
1413                 goto err_remove_dir;
1414
1415         /* 'ROM' [R] */
1416         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1417                                  &acpi_video_bus_ROM_fops,
1418                                  acpi_driver_data(device));
1419         if (!entry)
1420                 goto err_remove_info;
1421
1422         /* 'POST_info' [R] */
1423         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1424                                  &acpi_video_bus_POST_info_fops,
1425                                  acpi_driver_data(device));
1426         if (!entry)
1427                 goto err_remove_rom;
1428
1429         /* 'POST' [R/W] */
1430         acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1431         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1432                                  device_dir,
1433                                  &acpi_video_bus_POST_fops,
1434                                  acpi_driver_data(device));
1435         if (!entry)
1436                 goto err_remove_post_info;
1437
1438         /* 'DOS' [R/W] */
1439         acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1440         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1441                                  device_dir,
1442                                  &acpi_video_bus_DOS_fops,
1443                                  acpi_driver_data(device));
1444         if (!entry)
1445                 goto err_remove_post;
1446
1447         video->dir = acpi_device_dir(device) = device_dir;
1448         return 0;
1449
1450  err_remove_post:
1451         remove_proc_entry("POST", device_dir);
1452  err_remove_post_info:
1453         remove_proc_entry("POST_info", device_dir);
1454  err_remove_rom:
1455         remove_proc_entry("ROM", device_dir);
1456  err_remove_info:
1457         remove_proc_entry("info", device_dir);
1458  err_remove_dir:
1459         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1460         return -ENOMEM;
1461 }
1462
1463 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1464 {
1465         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1466
1467         if (device_dir) {
1468                 remove_proc_entry("info", device_dir);
1469                 remove_proc_entry("ROM", device_dir);
1470                 remove_proc_entry("POST_info", device_dir);
1471                 remove_proc_entry("POST", device_dir);
1472                 remove_proc_entry("DOS", device_dir);
1473                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1474                 acpi_device_dir(device) = NULL;
1475         }
1476
1477         return 0;
1478 }
1479
1480 /* --------------------------------------------------------------------------
1481                                  Driver Interface
1482    -------------------------------------------------------------------------- */
1483
1484 /* device interface */
1485 static struct acpi_video_device_attrib*
1486 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1487 {
1488         struct acpi_video_enumerated_device *ids;
1489         int i;
1490
1491         for (i = 0; i < video->attached_count; i++) {
1492                 ids = &video->attached_array[i];
1493                 if ((ids->value.int_val & 0xffff) == device_id)
1494                         return &ids->value.attrib;
1495         }
1496
1497         return NULL;
1498 }
1499
1500 static int
1501 acpi_video_bus_get_one_device(struct acpi_device *device,
1502                               struct acpi_video_bus *video)
1503 {
1504         unsigned long long device_id;
1505         int status;
1506         struct acpi_video_device *data;
1507         struct acpi_video_device_attrib* attribute;
1508
1509         if (!device || !video)
1510                 return -EINVAL;
1511
1512         status =
1513             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1514         if (ACPI_SUCCESS(status)) {
1515
1516                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1517                 if (!data)
1518                         return -ENOMEM;
1519
1520                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1521                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1522                 device->driver_data = data;
1523
1524                 data->device_id = device_id;
1525                 data->video = video;
1526                 data->dev = device;
1527
1528                 attribute = acpi_video_get_device_attr(video, device_id);
1529
1530                 if((attribute != NULL) && attribute->device_id_scheme) {
1531                         switch (attribute->display_type) {
1532                         case ACPI_VIDEO_DISPLAY_CRT:
1533                                 data->flags.crt = 1;
1534                                 break;
1535                         case ACPI_VIDEO_DISPLAY_TV:
1536                                 data->flags.tvout = 1;
1537                                 break;
1538                         case ACPI_VIDEO_DISPLAY_DVI:
1539                                 data->flags.dvi = 1;
1540                                 break;
1541                         case ACPI_VIDEO_DISPLAY_LCD:
1542                                 data->flags.lcd = 1;
1543                                 break;
1544                         default:
1545                                 data->flags.unknown = 1;
1546                                 break;
1547                         }
1548                         if(attribute->bios_can_detect)
1549                                 data->flags.bios = 1;
1550                 } else
1551                         data->flags.unknown = 1;
1552
1553                 acpi_video_device_bind(video, data);
1554                 acpi_video_device_find_cap(data);
1555
1556                 status = acpi_install_notify_handler(device->handle,
1557                                                      ACPI_DEVICE_NOTIFY,
1558                                                      acpi_video_device_notify,
1559                                                      data);
1560                 if (ACPI_FAILURE(status)) {
1561                         printk(KERN_ERR PREFIX
1562                                           "Error installing notify handler\n");
1563                         if(data->brightness)
1564                                 kfree(data->brightness->levels);
1565                         kfree(data->brightness);
1566                         kfree(data);
1567                         return -ENODEV;
1568                 }
1569
1570                 mutex_lock(&video->device_list_lock);
1571                 list_add_tail(&data->entry, &video->video_device_list);
1572                 mutex_unlock(&video->device_list_lock);
1573
1574                 acpi_video_device_add_fs(device);
1575
1576                 return 0;
1577         }
1578
1579         return -ENOENT;
1580 }
1581
1582 /*
1583  *  Arg:
1584  *      video   : video bus device
1585  *
1586  *  Return:
1587  *      none
1588  *
1589  *  Enumerate the video device list of the video bus,
1590  *  bind the ids with the corresponding video devices
1591  *  under the video bus.
1592  */
1593
1594 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1595 {
1596         struct acpi_video_device *dev;
1597
1598         mutex_lock(&video->device_list_lock);
1599
1600         list_for_each_entry(dev, &video->video_device_list, entry)
1601                 acpi_video_device_bind(video, dev);
1602
1603         mutex_unlock(&video->device_list_lock);
1604 }
1605
1606 /*
1607  *  Arg:
1608  *      video   : video bus device
1609  *      device  : video output device under the video
1610  *              bus
1611  *
1612  *  Return:
1613  *      none
1614  *
1615  *  Bind the ids with the corresponding video devices
1616  *  under the video bus.
1617  */
1618
1619 static void
1620 acpi_video_device_bind(struct acpi_video_bus *video,
1621                        struct acpi_video_device *device)
1622 {
1623         struct acpi_video_enumerated_device *ids;
1624         int i;
1625
1626         for (i = 0; i < video->attached_count; i++) {
1627                 ids = &video->attached_array[i];
1628                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1629                         ids->bind_info = device;
1630                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1631                 }
1632         }
1633 }
1634
1635 /*
1636  *  Arg:
1637  *      video   : video bus device
1638  *
1639  *  Return:
1640  *      < 0     : error
1641  *
1642  *  Call _DOD to enumerate all devices attached to display adapter
1643  *
1644  */
1645
1646 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1647 {
1648         int status;
1649         int count;
1650         int i;
1651         struct acpi_video_enumerated_device *active_list;
1652         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1653         union acpi_object *dod = NULL;
1654         union acpi_object *obj;
1655
1656         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1657         if (!ACPI_SUCCESS(status)) {
1658                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1659                 return status;
1660         }
1661
1662         dod = buffer.pointer;
1663         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1664                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1665                 status = -EFAULT;
1666                 goto out;
1667         }
1668
1669         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1670                           dod->package.count));
1671
1672         active_list = kcalloc(1 + dod->package.count,
1673                               sizeof(struct acpi_video_enumerated_device),
1674                               GFP_KERNEL);
1675         if (!active_list) {
1676                 status = -ENOMEM;
1677                 goto out;
1678         }
1679
1680         count = 0;
1681         for (i = 0; i < dod->package.count; i++) {
1682                 obj = &dod->package.elements[i];
1683
1684                 if (obj->type != ACPI_TYPE_INTEGER) {
1685                         printk(KERN_ERR PREFIX
1686                                 "Invalid _DOD data in element %d\n", i);
1687                         continue;
1688                 }
1689
1690                 active_list[count].value.int_val = obj->integer.value;
1691                 active_list[count].bind_info = NULL;
1692                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1693                                   (int)obj->integer.value));
1694                 count++;
1695         }
1696
1697         kfree(video->attached_array);
1698
1699         video->attached_array = active_list;
1700         video->attached_count = count;
1701
1702  out:
1703         kfree(buffer.pointer);
1704         return status;
1705 }
1706
1707 static int
1708 acpi_video_get_next_level(struct acpi_video_device *device,
1709                           u32 level_current, u32 event)
1710 {
1711         int min, max, min_above, max_below, i, l, delta = 255;
1712         max = max_below = 0;
1713         min = min_above = 255;
1714         /* Find closest level to level_current */
1715         for (i = 2; i < device->brightness->count; i++) {
1716                 l = device->brightness->levels[i];
1717                 if (abs(l - level_current) < abs(delta)) {
1718                         delta = l - level_current;
1719                         if (!delta)
1720                                 break;
1721                 }
1722         }
1723         /* Ajust level_current to closest available level */
1724         level_current += delta;
1725         for (i = 2; i < device->brightness->count; i++) {
1726                 l = device->brightness->levels[i];
1727                 if (l < min)
1728                         min = l;
1729                 if (l > max)
1730                         max = l;
1731                 if (l < min_above && l > level_current)
1732                         min_above = l;
1733                 if (l > max_below && l < level_current)
1734                         max_below = l;
1735         }
1736
1737         switch (event) {
1738         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1739                 return (level_current < max) ? min_above : min;
1740         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1741                 return (level_current < max) ? min_above : max;
1742         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1743                 return (level_current > min) ? max_below : min;
1744         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1745         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1746                 return 0;
1747         default:
1748                 return level_current;
1749         }
1750 }
1751
1752 static void
1753 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1754 {
1755         unsigned long long level_current, level_next;
1756         if (!device->brightness)
1757                 return;
1758         acpi_video_device_lcd_get_level_current(device, &level_current);
1759         level_next = acpi_video_get_next_level(device, level_current, event);
1760         acpi_video_device_lcd_set_level(device, level_next);
1761 }
1762
1763 static int
1764 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1765                            struct acpi_device *device)
1766 {
1767         int status = 0;
1768         struct acpi_device *dev;
1769
1770         acpi_video_device_enumerate(video);
1771
1772         list_for_each_entry(dev, &device->children, node) {
1773
1774                 status = acpi_video_bus_get_one_device(dev, video);
1775                 if (ACPI_FAILURE(status)) {
1776                         printk(KERN_WARNING PREFIX
1777                                         "Cant attach device");
1778                         continue;
1779                 }
1780         }
1781         return status;
1782 }
1783
1784 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1785 {
1786         acpi_status status;
1787         struct acpi_video_bus *video;
1788
1789
1790         if (!device || !device->video)
1791                 return -ENOENT;
1792
1793         video = device->video;
1794
1795         acpi_video_device_remove_fs(device->dev);
1796
1797         status = acpi_remove_notify_handler(device->dev->handle,
1798                                             ACPI_DEVICE_NOTIFY,
1799                                             acpi_video_device_notify);
1800         backlight_device_unregister(device->backlight);
1801         if (device->cdev) {
1802                 sysfs_remove_link(&device->dev->dev.kobj,
1803                                   "thermal_cooling");
1804                 sysfs_remove_link(&device->cdev->device.kobj,
1805                                   "device");
1806                 thermal_cooling_device_unregister(device->cdev);
1807                 device->cdev = NULL;
1808         }
1809         video_output_unregister(device->output_dev);
1810
1811         return 0;
1812 }
1813
1814 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1815 {
1816         int status;
1817         struct acpi_video_device *dev, *next;
1818
1819         mutex_lock(&video->device_list_lock);
1820
1821         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1822
1823                 status = acpi_video_bus_put_one_device(dev);
1824                 if (ACPI_FAILURE(status))
1825                         printk(KERN_WARNING PREFIX
1826                                "hhuuhhuu bug in acpi video driver.\n");
1827
1828                 if (dev->brightness) {
1829                         kfree(dev->brightness->levels);
1830                         kfree(dev->brightness);
1831                 }
1832                 list_del(&dev->entry);
1833                 kfree(dev);
1834         }
1835
1836         mutex_unlock(&video->device_list_lock);
1837
1838         return 0;
1839 }
1840
1841 /* acpi_video interface */
1842
1843 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1844 {
1845         return acpi_video_bus_DOS(video, 0, 0);
1846 }
1847
1848 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1849 {
1850         return acpi_video_bus_DOS(video, 0, 1);
1851 }
1852
1853 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1854 {
1855         struct acpi_video_bus *video = data;
1856         struct acpi_device *device = NULL;
1857         struct input_dev *input;
1858         int keycode;
1859
1860         if (!video)
1861                 return;
1862
1863         device = video->device;
1864         input = video->input;
1865
1866         switch (event) {
1867         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1868                                          * most likely via hotkey. */
1869                 acpi_bus_generate_proc_event(device, event, 0);
1870                 keycode = KEY_SWITCHVIDEOMODE;
1871                 break;
1872
1873         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1874                                          * connector. */
1875                 acpi_video_device_enumerate(video);
1876                 acpi_video_device_rebind(video);
1877                 acpi_bus_generate_proc_event(device, event, 0);
1878                 keycode = KEY_SWITCHVIDEOMODE;
1879                 break;
1880
1881         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1882                 acpi_bus_generate_proc_event(device, event, 0);
1883                 keycode = KEY_SWITCHVIDEOMODE;
1884                 break;
1885         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1886                 acpi_bus_generate_proc_event(device, event, 0);
1887                 keycode = KEY_VIDEO_NEXT;
1888                 break;
1889         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1890                 acpi_bus_generate_proc_event(device, event, 0);
1891                 keycode = KEY_VIDEO_PREV;
1892                 break;
1893
1894         default:
1895                 keycode = KEY_UNKNOWN;
1896                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1897                                   "Unsupported event [0x%x]\n", event));
1898                 break;
1899         }
1900
1901         acpi_notifier_call_chain(device, event, 0);
1902         input_report_key(input, keycode, 1);
1903         input_sync(input);
1904         input_report_key(input, keycode, 0);
1905         input_sync(input);
1906
1907         return;
1908 }
1909
1910 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1911 {
1912         struct acpi_video_device *video_device = data;
1913         struct acpi_device *device = NULL;
1914         struct acpi_video_bus *bus;
1915         struct input_dev *input;
1916         int keycode;
1917
1918         if (!video_device)
1919                 return;
1920
1921         device = video_device->dev;
1922         bus = video_device->video;
1923         input = bus->input;
1924
1925         switch (event) {
1926         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1927                 if (brightness_switch_enabled)
1928                         acpi_video_switch_brightness(video_device, event);
1929                 acpi_bus_generate_proc_event(device, event, 0);
1930                 keycode = KEY_BRIGHTNESS_CYCLE;
1931                 break;
1932         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1933                 if (brightness_switch_enabled)
1934                         acpi_video_switch_brightness(video_device, event);
1935                 acpi_bus_generate_proc_event(device, event, 0);
1936                 keycode = KEY_BRIGHTNESSUP;
1937                 break;
1938         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1939                 if (brightness_switch_enabled)
1940                         acpi_video_switch_brightness(video_device, event);
1941                 acpi_bus_generate_proc_event(device, event, 0);
1942                 keycode = KEY_BRIGHTNESSDOWN;
1943                 break;
1944         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1945                 if (brightness_switch_enabled)
1946                         acpi_video_switch_brightness(video_device, event);
1947                 acpi_bus_generate_proc_event(device, event, 0);
1948                 keycode = KEY_BRIGHTNESS_ZERO;
1949                 break;
1950         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1951                 if (brightness_switch_enabled)
1952                         acpi_video_switch_brightness(video_device, event);
1953                 acpi_bus_generate_proc_event(device, event, 0);
1954                 keycode = KEY_DISPLAY_OFF;
1955                 break;
1956         default:
1957                 keycode = KEY_UNKNOWN;
1958                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1959                                   "Unsupported event [0x%x]\n", event));
1960                 break;
1961         }
1962
1963         acpi_notifier_call_chain(device, event, 0);
1964         input_report_key(input, keycode, 1);
1965         input_sync(input);
1966         input_report_key(input, keycode, 0);
1967         input_sync(input);
1968
1969         return;
1970 }
1971
1972 static int instance;
1973 static int acpi_video_resume(struct acpi_device *device)
1974 {
1975         struct acpi_video_bus *video;
1976         struct acpi_video_device *video_device;
1977         int i;
1978
1979         if (!device || !acpi_driver_data(device))
1980                 return -EINVAL;
1981
1982         video = acpi_driver_data(device);
1983
1984         for (i = 0; i < video->attached_count; i++) {
1985                 video_device = video->attached_array[i].bind_info;
1986                 if (video_device && video_device->backlight)
1987                         acpi_video_set_brightness(video_device->backlight);
1988         }
1989         return AE_OK;
1990 }
1991
1992 static int acpi_video_bus_add(struct acpi_device *device)
1993 {
1994         acpi_status status;
1995         struct acpi_video_bus *video;
1996         struct input_dev *input;
1997         int error;
1998
1999         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2000         if (!video)
2001                 return -ENOMEM;
2002
2003         /* a hack to fix the duplicate name "VID" problem on T61 */
2004         if (!strcmp(device->pnp.bus_id, "VID")) {
2005                 if (instance)
2006                         device->pnp.bus_id[3] = '0' + instance;
2007                 instance ++;
2008         }
2009         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2010         if (!strcmp(device->pnp.bus_id, "VGA")) {
2011                 if (instance)
2012                         device->pnp.bus_id[3] = '0' + instance;
2013                 instance++;
2014         }
2015
2016         video->device = device;
2017         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2018         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2019         device->driver_data = video;
2020
2021         acpi_video_bus_find_cap(video);
2022         error = acpi_video_bus_check(video);
2023         if (error)
2024                 goto err_free_video;
2025
2026         error = acpi_video_bus_add_fs(device);
2027         if (error)
2028                 goto err_free_video;
2029
2030         mutex_init(&video->device_list_lock);
2031         INIT_LIST_HEAD(&video->video_device_list);
2032
2033         acpi_video_bus_get_devices(video, device);
2034         acpi_video_bus_start_devices(video);
2035
2036         status = acpi_install_notify_handler(device->handle,
2037                                              ACPI_DEVICE_NOTIFY,
2038                                              acpi_video_bus_notify, video);
2039         if (ACPI_FAILURE(status)) {
2040                 printk(KERN_ERR PREFIX
2041                                   "Error installing notify handler\n");
2042                 error = -ENODEV;
2043                 goto err_stop_video;
2044         }
2045
2046         video->input = input = input_allocate_device();
2047         if (!input) {
2048                 error = -ENOMEM;
2049                 goto err_uninstall_notify;
2050         }
2051
2052         snprintf(video->phys, sizeof(video->phys),
2053                 "%s/video/input0", acpi_device_hid(video->device));
2054
2055         input->name = acpi_device_name(video->device);
2056         input->phys = video->phys;
2057         input->id.bustype = BUS_HOST;
2058         input->id.product = 0x06;
2059         input->dev.parent = &device->dev;
2060         input->evbit[0] = BIT(EV_KEY);
2061         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2062         set_bit(KEY_VIDEO_NEXT, input->keybit);
2063         set_bit(KEY_VIDEO_PREV, input->keybit);
2064         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2065         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2066         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2067         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2068         set_bit(KEY_DISPLAY_OFF, input->keybit);
2069         set_bit(KEY_UNKNOWN, input->keybit);
2070
2071         error = input_register_device(input);
2072         if (error)
2073                 goto err_free_input_dev;
2074
2075         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2076                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2077                video->flags.multihead ? "yes" : "no",
2078                video->flags.rom ? "yes" : "no",
2079                video->flags.post ? "yes" : "no");
2080
2081         return 0;
2082
2083  err_free_input_dev:
2084         input_free_device(input);
2085  err_uninstall_notify:
2086         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2087                                    acpi_video_bus_notify);
2088  err_stop_video:
2089         acpi_video_bus_stop_devices(video);
2090         acpi_video_bus_put_devices(video);
2091         kfree(video->attached_array);
2092         acpi_video_bus_remove_fs(device);
2093  err_free_video:
2094         kfree(video);
2095         device->driver_data = NULL;
2096
2097         return error;
2098 }
2099
2100 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2101 {
2102         acpi_status status = 0;
2103         struct acpi_video_bus *video = NULL;
2104
2105
2106         if (!device || !acpi_driver_data(device))
2107                 return -EINVAL;
2108
2109         video = acpi_driver_data(device);
2110
2111         acpi_video_bus_stop_devices(video);
2112
2113         status = acpi_remove_notify_handler(video->device->handle,
2114                                             ACPI_DEVICE_NOTIFY,
2115                                             acpi_video_bus_notify);
2116
2117         acpi_video_bus_put_devices(video);
2118         acpi_video_bus_remove_fs(device);
2119
2120         input_unregister_device(video->input);
2121         kfree(video->attached_array);
2122         kfree(video);
2123
2124         return 0;
2125 }
2126
2127 static int __init acpi_video_init(void)
2128 {
2129         int result = 0;
2130
2131         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2132         if (!acpi_video_dir)
2133                 return -ENODEV;
2134         acpi_video_dir->owner = THIS_MODULE;
2135
2136         result = acpi_bus_register_driver(&acpi_video_bus);
2137         if (result < 0) {
2138                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2139                 return -ENODEV;
2140         }
2141
2142         return 0;
2143 }
2144
2145 static void __exit acpi_video_exit(void)
2146 {
2147
2148         acpi_bus_unregister_driver(&acpi_video_bus);
2149
2150         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2151
2152         return;
2153 }
2154
2155 module_init(acpi_video_init);
2156 module_exit(acpi_video_exit);