git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/video.c

   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/list.h>
  32 #include <linux/mutex.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/input.h>
  36 #include <linux/backlight.h>
  37 #include <linux/thermal.h>
  38 #include <linux/video_output.h>
  39 #include <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         /* 'info' [R] */
1129         entry = proc_create_data("info", S_IRUGO, device_dir,
1130                         &acpi_video_device_info_fops, acpi_driver_data(device));
1131         if (!entry)
1132                 goto err_remove_dir;
1133
1134         /* 'state' [R/W] */
1135         acpi_video_device_state_fops.write = acpi_video_device_write_state;
1136         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1137                                  device_dir,
1138                                  &acpi_video_device_state_fops,
1139                                  acpi_driver_data(device));
1140         if (!entry)
1141                 goto err_remove_info;
1142
1143         /* 'brightness' [R/W] */
1144         acpi_video_device_brightness_fops.write =
1145                 acpi_video_device_write_brightness;
1146         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1147                                  device_dir,
1148                                  &acpi_video_device_brightness_fops,
1149                                  acpi_driver_data(device));
1150         if (!entry)
1151                 goto err_remove_state;
1152
1153         /* 'EDID' [R] */
1154         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1155                                  &acpi_video_device_EDID_fops,
1156                                  acpi_driver_data(device));
1157         if (!entry)
1158                 goto err_remove_brightness;
1159
1160         acpi_device_dir(device) = device_dir;
1161
1162         return 0;
1163
1164  err_remove_brightness:
1165         remove_proc_entry("brightness", device_dir);
1166  err_remove_state:
1167         remove_proc_entry("state", device_dir);
1168  err_remove_info:
1169         remove_proc_entry("info", device_dir);
1170  err_remove_dir:
1171         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1172         return -ENOMEM;
1173 }
1174
1175 static int acpi_video_device_remove_fs(struct acpi_device *device)
1176 {
1177         struct acpi_video_device *vid_dev;
1178         struct proc_dir_entry *device_dir;
1179
1180         vid_dev = acpi_driver_data(device);
1181         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1182                 return -ENODEV;
1183
1184         device_dir = acpi_device_dir(device);
1185         if (device_dir) {
1186                 remove_proc_entry("info", device_dir);
1187                 remove_proc_entry("state", device_dir);
1188                 remove_proc_entry("brightness", device_dir);
1189                 remove_proc_entry("EDID", device_dir);
1190                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1191                 acpi_device_dir(device) = NULL;
1192         }
1193
1194         return 0;
1195 }
1196
1197 /* video bus */
1198 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1199 {
1200         struct acpi_video_bus *video = seq->private;
1201
1202
1203         if (!video)
1204                 goto end;
1205
1206         seq_printf(seq, "Switching heads:              %s\n",
1207                    video->flags.multihead ? "yes" : "no");
1208         seq_printf(seq, "Video ROM:                    %s\n",
1209                    video->flags.rom ? "yes" : "no");
1210         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1211                    video->flags.post ? "yes" : "no");
1212
1213       end:
1214         return 0;
1215 }
1216
1217 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1218 {
1219         return single_open(file, acpi_video_bus_info_seq_show,
1220                            PDE(inode)->data);
1221 }
1222
1223 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1224 {
1225         struct acpi_video_bus *video = seq->private;
1226
1227
1228         if (!video)
1229                 goto end;
1230
1231         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1232         seq_printf(seq, "<TODO>\n");
1233
1234       end:
1235         return 0;
1236 }
1237
1238 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1239 {
1240         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1241 }
1242
1243 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1244 {
1245         struct acpi_video_bus *video = seq->private;
1246         unsigned long long options;
1247         int status;
1248
1249
1250         if (!video)
1251                 goto end;
1252
1253         status = acpi_video_bus_POST_options(video, &options);
1254         if (ACPI_SUCCESS(status)) {
1255                 if (!(options & 1)) {
1256                         printk(KERN_WARNING PREFIX
1257                                "The motherboard VGA device is not listed as a possible POST device.\n");
1258                         printk(KERN_WARNING PREFIX
1259                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1260                 }
1261                 printk(KERN_WARNING "%llx\n", options);
1262                 seq_printf(seq, "can POST: <integrated video>");
1263                 if (options & 2)
1264                         seq_printf(seq, " <PCI video>");
1265                 if (options & 4)
1266                         seq_printf(seq, " <AGP video>");
1267                 seq_putc(seq, '\n');
1268         } else
1269                 seq_printf(seq, "<not supported>\n");
1270       end:
1271         return 0;
1272 }
1273
1274 static int
1275 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1276 {
1277         return single_open(file, acpi_video_bus_POST_info_seq_show,
1278                            PDE(inode)->data);
1279 }
1280
1281 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1282 {
1283         struct acpi_video_bus *video = seq->private;
1284         int status;
1285         unsigned long long id;
1286
1287
1288         if (!video)
1289                 goto end;
1290
1291         status = acpi_video_bus_get_POST(video, &id);
1292         if (!ACPI_SUCCESS(status)) {
1293                 seq_printf(seq, "<not supported>\n");
1294                 goto end;
1295         }
1296         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1297
1298       end:
1299         return 0;
1300 }
1301
1302 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1303 {
1304         struct acpi_video_bus *video = seq->private;
1305
1306
1307         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1308
1309         return 0;
1310 }
1311
1312 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1313 {
1314         return single_open(file, acpi_video_bus_POST_seq_show,
1315                            PDE(inode)->data);
1316 }
1317
1318 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1319 {
1320         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1321 }
1322
1323 static ssize_t
1324 acpi_video_bus_write_POST(struct file *file,
1325                           const char __user * buffer,
1326                           size_t count, loff_t * data)
1327 {
1328         int status;
1329         struct seq_file *m = file->private_data;
1330         struct acpi_video_bus *video = m->private;
1331         char str[12] = { 0 };
1332         unsigned long long opt, options;
1333
1334
1335         if (!video || count + 1 > sizeof str)
1336                 return -EINVAL;
1337
1338         status = acpi_video_bus_POST_options(video, &options);
1339         if (!ACPI_SUCCESS(status))
1340                 return -EINVAL;
1341
1342         if (copy_from_user(str, buffer, count))
1343                 return -EFAULT;
1344
1345         str[count] = 0;
1346         opt = strtoul(str, NULL, 0);
1347         if (opt > 3)
1348                 return -EFAULT;
1349
1350         /* just in case an OEM 'forgot' the motherboard... */
1351         options |= 1;
1352
1353         if (options & (1ul << opt)) {
1354                 status = acpi_video_bus_set_POST(video, opt);
1355                 if (!ACPI_SUCCESS(status))
1356                         return -EFAULT;
1357
1358         }
1359
1360         return count;
1361 }
1362
1363 static ssize_t
1364 acpi_video_bus_write_DOS(struct file *file,
1365                          const char __user * buffer,
1366                          size_t count, loff_t * data)
1367 {
1368         int status;
1369         struct seq_file *m = file->private_data;
1370         struct acpi_video_bus *video = m->private;
1371         char str[12] = { 0 };
1372         unsigned long opt;
1373
1374
1375         if (!video || count + 1 > sizeof str)
1376                 return -EINVAL;
1377
1378         if (copy_from_user(str, buffer, count))
1379                 return -EFAULT;
1380
1381         str[count] = 0;
1382         opt = strtoul(str, NULL, 0);
1383         if (opt > 7)
1384                 return -EFAULT;
1385
1386         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1387
1388         if (!ACPI_SUCCESS(status))
1389                 return -EFAULT;
1390
1391         return count;
1392 }
1393
1394 static int acpi_video_bus_add_fs(struct acpi_device *device)
1395 {
1396         struct acpi_video_bus *video = acpi_driver_data(device);
1397         struct proc_dir_entry *device_dir;
1398         struct proc_dir_entry *entry;
1399
1400         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1401         if (!device_dir)
1402                 return -ENOMEM;
1403
1404         /* 'info' [R] */
1405         entry = proc_create_data("info", S_IRUGO, device_dir,
1406                                  &acpi_video_bus_info_fops,
1407                                  acpi_driver_data(device));
1408         if (!entry)
1409                 goto err_remove_dir;
1410
1411         /* 'ROM' [R] */
1412         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1413                                  &acpi_video_bus_ROM_fops,
1414                                  acpi_driver_data(device));
1415         if (!entry)
1416                 goto err_remove_info;
1417
1418         /* 'POST_info' [R] */
1419         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1420                                  &acpi_video_bus_POST_info_fops,
1421                                  acpi_driver_data(device));
1422         if (!entry)
1423                 goto err_remove_rom;
1424
1425         /* 'POST' [R/W] */
1426         acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1427         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1428                                  device_dir,
1429                                  &acpi_video_bus_POST_fops,
1430                                  acpi_driver_data(device));
1431         if (!entry)
1432                 goto err_remove_post_info;
1433
1434         /* 'DOS' [R/W] */
1435         acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1436         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1437                                  device_dir,
1438                                  &acpi_video_bus_DOS_fops,
1439                                  acpi_driver_data(device));
1440         if (!entry)
1441                 goto err_remove_post;
1442
1443         video->dir = acpi_device_dir(device) = device_dir;
1444         return 0;
1445
1446  err_remove_post:
1447         remove_proc_entry("POST", device_dir);
1448  err_remove_post_info:
1449         remove_proc_entry("POST_info", device_dir);
1450  err_remove_rom:
1451         remove_proc_entry("ROM", device_dir);
1452  err_remove_info:
1453         remove_proc_entry("info", device_dir);
1454  err_remove_dir:
1455         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1456         return -ENOMEM;
1457 }
1458
1459 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1460 {
1461         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1462
1463         if (device_dir) {
1464                 remove_proc_entry("info", device_dir);
1465                 remove_proc_entry("ROM", device_dir);
1466                 remove_proc_entry("POST_info", device_dir);
1467                 remove_proc_entry("POST", device_dir);
1468                 remove_proc_entry("DOS", device_dir);
1469                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1470                 acpi_device_dir(device) = NULL;
1471         }
1472
1473         return 0;
1474 }
1475
1476 /* --------------------------------------------------------------------------
1477                                  Driver Interface
1478    -------------------------------------------------------------------------- */
1479
1480 /* device interface */
1481 static struct acpi_video_device_attrib*
1482 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1483 {
1484         struct acpi_video_enumerated_device *ids;
1485         int i;
1486
1487         for (i = 0; i < video->attached_count; i++) {
1488                 ids = &video->attached_array[i];
1489                 if ((ids->value.int_val & 0xffff) == device_id)
1490                         return &ids->value.attrib;
1491         }
1492
1493         return NULL;
1494 }
1495
1496 static int
1497 acpi_video_bus_get_one_device(struct acpi_device *device,
1498                               struct acpi_video_bus *video)
1499 {
1500         unsigned long long device_id;
1501         int status;
1502         struct acpi_video_device *data;
1503         struct acpi_video_device_attrib* attribute;
1504
1505         if (!device || !video)
1506                 return -EINVAL;
1507
1508         status =
1509             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1510         if (ACPI_SUCCESS(status)) {
1511
1512                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1513                 if (!data)
1514                         return -ENOMEM;
1515
1516                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1517                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1518                 device->driver_data = data;
1519
1520                 data->device_id = device_id;
1521                 data->video = video;
1522                 data->dev = device;
1523
1524                 attribute = acpi_video_get_device_attr(video, device_id);
1525
1526                 if((attribute != NULL) && attribute->device_id_scheme) {
1527                         switch (attribute->display_type) {
1528                         case ACPI_VIDEO_DISPLAY_CRT:
1529                                 data->flags.crt = 1;
1530                                 break;
1531                         case ACPI_VIDEO_DISPLAY_TV:
1532                                 data->flags.tvout = 1;
1533                                 break;
1534                         case ACPI_VIDEO_DISPLAY_DVI:
1535                                 data->flags.dvi = 1;
1536                                 break;
1537                         case ACPI_VIDEO_DISPLAY_LCD:
1538                                 data->flags.lcd = 1;
1539                                 break;
1540                         default:
1541                                 data->flags.unknown = 1;
1542                                 break;
1543                         }
1544                         if(attribute->bios_can_detect)
1545                                 data->flags.bios = 1;
1546                 } else
1547                         data->flags.unknown = 1;
1548
1549                 acpi_video_device_bind(video, data);
1550                 acpi_video_device_find_cap(data);
1551
1552                 status = acpi_install_notify_handler(device->handle,
1553                                                      ACPI_DEVICE_NOTIFY,
1554                                                      acpi_video_device_notify,
1555                                                      data);
1556                 if (ACPI_FAILURE(status)) {
1557                         printk(KERN_ERR PREFIX
1558                                           "Error installing notify handler\n");
1559                         if(data->brightness)
1560                                 kfree(data->brightness->levels);
1561                         kfree(data->brightness);
1562                         kfree(data);
1563                         return -ENODEV;
1564                 }
1565
1566                 mutex_lock(&video->device_list_lock);
1567                 list_add_tail(&data->entry, &video->video_device_list);
1568                 mutex_unlock(&video->device_list_lock);
1569
1570                 acpi_video_device_add_fs(device);
1571
1572                 return 0;
1573         }
1574
1575         return -ENOENT;
1576 }
1577
1578 /*
1579  *  Arg:
1580  *      video   : video bus device
1581  *
1582  *  Return:
1583  *      none
1584  *
1585  *  Enumerate the video device list of the video bus,
1586  *  bind the ids with the corresponding video devices
1587  *  under the video bus.
1588  */
1589
1590 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1591 {
1592         struct acpi_video_device *dev;
1593
1594         mutex_lock(&video->device_list_lock);
1595
1596         list_for_each_entry(dev, &video->video_device_list, entry)
1597                 acpi_video_device_bind(video, dev);
1598
1599         mutex_unlock(&video->device_list_lock);
1600 }
1601
1602 /*
1603  *  Arg:
1604  *      video   : video bus device
1605  *      device  : video output device under the video
1606  *              bus
1607  *
1608  *  Return:
1609  *      none
1610  *
1611  *  Bind the ids with the corresponding video devices
1612  *  under the video bus.
1613  */
1614
1615 static void
1616 acpi_video_device_bind(struct acpi_video_bus *video,
1617                        struct acpi_video_device *device)
1618 {
1619         struct acpi_video_enumerated_device *ids;
1620         int i;
1621
1622         for (i = 0; i < video->attached_count; i++) {
1623                 ids = &video->attached_array[i];
1624                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1625                         ids->bind_info = device;
1626                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1627                 }
1628         }
1629 }
1630
1631 /*
1632  *  Arg:
1633  *      video   : video bus device
1634  *
1635  *  Return:
1636  *      < 0     : error
1637  *
1638  *  Call _DOD to enumerate all devices attached to display adapter
1639  *
1640  */
1641
1642 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1643 {
1644         int status;
1645         int count;
1646         int i;
1647         struct acpi_video_enumerated_device *active_list;
1648         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1649         union acpi_object *dod = NULL;
1650         union acpi_object *obj;
1651
1652         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1653         if (!ACPI_SUCCESS(status)) {
1654                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1655                 return status;
1656         }
1657
1658         dod = buffer.pointer;
1659         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1660                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1661                 status = -EFAULT;
1662                 goto out;
1663         }
1664
1665         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1666                           dod->package.count));
1667
1668         active_list = kcalloc(1 + dod->package.count,
1669                               sizeof(struct acpi_video_enumerated_device),
1670                               GFP_KERNEL);
1671         if (!active_list) {
1672                 status = -ENOMEM;
1673                 goto out;
1674         }
1675
1676         count = 0;
1677         for (i = 0; i < dod->package.count; i++) {
1678                 obj = &dod->package.elements[i];
1679
1680                 if (obj->type != ACPI_TYPE_INTEGER) {
1681                         printk(KERN_ERR PREFIX
1682                                 "Invalid _DOD data in element %d\n", i);
1683                         continue;
1684                 }
1685
1686                 active_list[count].value.int_val = obj->integer.value;
1687                 active_list[count].bind_info = NULL;
1688                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1689                                   (int)obj->integer.value));
1690                 count++;
1691         }
1692
1693         kfree(video->attached_array);
1694
1695         video->attached_array = active_list;
1696         video->attached_count = count;
1697
1698  out:
1699         kfree(buffer.pointer);
1700         return status;
1701 }
1702
1703 static int
1704 acpi_video_get_next_level(struct acpi_video_device *device,
1705                           u32 level_current, u32 event)
1706 {
1707         int min, max, min_above, max_below, i, l, delta = 255;
1708         max = max_below = 0;
1709         min = min_above = 255;
1710         /* Find closest level to level_current */
1711         for (i = 2; i < device->brightness->count; i++) {
1712                 l = device->brightness->levels[i];
1713                 if (abs(l - level_current) < abs(delta)) {
1714                         delta = l - level_current;
1715                         if (!delta)
1716                                 break;
1717                 }
1718         }
1719         /* Ajust level_current to closest available level */
1720         level_current += delta;
1721         for (i = 2; i < device->brightness->count; i++) {
1722                 l = device->brightness->levels[i];
1723                 if (l < min)
1724                         min = l;
1725                 if (l > max)
1726                         max = l;
1727                 if (l < min_above && l > level_current)
1728                         min_above = l;
1729                 if (l > max_below && l < level_current)
1730                         max_below = l;
1731         }
1732
1733         switch (event) {
1734         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1735                 return (level_current < max) ? min_above : min;
1736         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1737                 return (level_current < max) ? min_above : max;
1738         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1739                 return (level_current > min) ? max_below : min;
1740         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1741         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1742                 return 0;
1743         default:
1744                 return level_current;
1745         }
1746 }
1747
1748 static void
1749 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1750 {
1751         unsigned long long level_current, level_next;
1752         if (!device->brightness)
1753                 return;
1754         acpi_video_device_lcd_get_level_current(device, &level_current);
1755         level_next = acpi_video_get_next_level(device, level_current, event);
1756         acpi_video_device_lcd_set_level(device, level_next);
1757 }
1758
1759 static int
1760 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1761                            struct acpi_device *device)
1762 {
1763         int status = 0;
1764         struct acpi_device *dev;
1765
1766         acpi_video_device_enumerate(video);
1767
1768         list_for_each_entry(dev, &device->children, node) {
1769
1770                 status = acpi_video_bus_get_one_device(dev, video);
1771                 if (ACPI_FAILURE(status)) {
1772                         printk(KERN_WARNING PREFIX
1773                                         "Cant attach device");
1774                         continue;
1775                 }
1776         }
1777         return status;
1778 }
1779
1780 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1781 {
1782         acpi_status status;
1783         struct acpi_video_bus *video;
1784
1785
1786         if (!device || !device->video)
1787                 return -ENOENT;
1788
1789         video = device->video;
1790
1791         acpi_video_device_remove_fs(device->dev);
1792
1793         status = acpi_remove_notify_handler(device->dev->handle,
1794                                             ACPI_DEVICE_NOTIFY,
1795                                             acpi_video_device_notify);
1796         backlight_device_unregister(device->backlight);
1797         if (device->cdev) {
1798                 sysfs_remove_link(&device->dev->dev.kobj,
1799                                   "thermal_cooling");
1800                 sysfs_remove_link(&device->cdev->device.kobj,
1801                                   "device");
1802                 thermal_cooling_device_unregister(device->cdev);
1803                 device->cdev = NULL;
1804         }
1805         video_output_unregister(device->output_dev);
1806
1807         return 0;
1808 }
1809
1810 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1811 {
1812         int status;
1813         struct acpi_video_device *dev, *next;
1814
1815         mutex_lock(&video->device_list_lock);
1816
1817         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1818
1819                 status = acpi_video_bus_put_one_device(dev);
1820                 if (ACPI_FAILURE(status))
1821                         printk(KERN_WARNING PREFIX
1822                                "hhuuhhuu bug in acpi video driver.\n");
1823
1824                 if (dev->brightness) {
1825                         kfree(dev->brightness->levels);
1826                         kfree(dev->brightness);
1827                 }
1828                 list_del(&dev->entry);
1829                 kfree(dev);
1830         }
1831
1832         mutex_unlock(&video->device_list_lock);
1833
1834         return 0;
1835 }
1836
1837 /* acpi_video interface */
1838
1839 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1840 {
1841         return acpi_video_bus_DOS(video, 0, 0);
1842 }
1843
1844 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1845 {
1846         return acpi_video_bus_DOS(video, 0, 1);
1847 }
1848
1849 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1850 {
1851         struct acpi_video_bus *video = data;
1852         struct acpi_device *device = NULL;
1853         struct input_dev *input;
1854         int keycode;
1855
1856         if (!video)
1857                 return;
1858
1859         device = video->device;
1860         input = video->input;
1861
1862         switch (event) {
1863         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1864                                          * most likely via hotkey. */
1865                 acpi_bus_generate_proc_event(device, event, 0);
1866                 keycode = KEY_SWITCHVIDEOMODE;
1867                 break;
1868
1869         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1870                                          * connector. */
1871                 acpi_video_device_enumerate(video);
1872                 acpi_video_device_rebind(video);
1873                 acpi_bus_generate_proc_event(device, event, 0);
1874                 keycode = KEY_SWITCHVIDEOMODE;
1875                 break;
1876
1877         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1878                 acpi_bus_generate_proc_event(device, event, 0);
1879                 keycode = KEY_SWITCHVIDEOMODE;
1880                 break;
1881         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1882                 acpi_bus_generate_proc_event(device, event, 0);
1883                 keycode = KEY_VIDEO_NEXT;
1884                 break;
1885         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1886                 acpi_bus_generate_proc_event(device, event, 0);
1887                 keycode = KEY_VIDEO_PREV;
1888                 break;
1889
1890         default:
1891                 keycode = KEY_UNKNOWN;
1892                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1893                                   "Unsupported event [0x%x]\n", event));
1894                 break;
1895         }
1896
1897         acpi_notifier_call_chain(device, event, 0);
1898         input_report_key(input, keycode, 1);
1899         input_sync(input);
1900         input_report_key(input, keycode, 0);
1901         input_sync(input);
1902
1903         return;
1904 }
1905
1906 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1907 {
1908         struct acpi_video_device *video_device = data;
1909         struct acpi_device *device = NULL;
1910         struct acpi_video_bus *bus;
1911         struct input_dev *input;
1912         int keycode;
1913
1914         if (!video_device)
1915                 return;
1916
1917         device = video_device->dev;
1918         bus = video_device->video;
1919         input = bus->input;
1920
1921         switch (event) {
1922         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1923                 if (brightness_switch_enabled)
1924                         acpi_video_switch_brightness(video_device, event);
1925                 acpi_bus_generate_proc_event(device, event, 0);
1926                 keycode = KEY_BRIGHTNESS_CYCLE;
1927                 break;
1928         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1929                 if (brightness_switch_enabled)
1930                         acpi_video_switch_brightness(video_device, event);
1931                 acpi_bus_generate_proc_event(device, event, 0);
1932                 keycode = KEY_BRIGHTNESSUP;
1933                 break;
1934         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1935                 if (brightness_switch_enabled)
1936                         acpi_video_switch_brightness(video_device, event);
1937                 acpi_bus_generate_proc_event(device, event, 0);
1938                 keycode = KEY_BRIGHTNESSDOWN;
1939                 break;
1940         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1941                 if (brightness_switch_enabled)
1942                         acpi_video_switch_brightness(video_device, event);
1943                 acpi_bus_generate_proc_event(device, event, 0);
1944                 keycode = KEY_BRIGHTNESS_ZERO;
1945                 break;
1946         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1947                 if (brightness_switch_enabled)
1948                         acpi_video_switch_brightness(video_device, event);
1949                 acpi_bus_generate_proc_event(device, event, 0);
1950                 keycode = KEY_DISPLAY_OFF;
1951                 break;
1952         default:
1953                 keycode = KEY_UNKNOWN;
1954                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1955                                   "Unsupported event [0x%x]\n", event));
1956                 break;
1957         }
1958
1959         acpi_notifier_call_chain(device, event, 0);
1960         input_report_key(input, keycode, 1);
1961         input_sync(input);
1962         input_report_key(input, keycode, 0);
1963         input_sync(input);
1964
1965         return;
1966 }
1967
1968 static int instance;
1969 static int acpi_video_resume(struct acpi_device *device)
1970 {
1971         struct acpi_video_bus *video;
1972         struct acpi_video_device *video_device;
1973         int i;
1974
1975         if (!device || !acpi_driver_data(device))
1976                 return -EINVAL;
1977
1978         video = acpi_driver_data(device);
1979
1980         for (i = 0; i < video->attached_count; i++) {
1981                 video_device = video->attached_array[i].bind_info;
1982                 if (video_device && video_device->backlight)
1983                         acpi_video_set_brightness(video_device->backlight);
1984         }
1985         return AE_OK;
1986 }
1987
1988 static int acpi_video_bus_add(struct acpi_device *device)
1989 {
1990         acpi_status status;
1991         struct acpi_video_bus *video;
1992         struct input_dev *input;
1993         int error;
1994
1995         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1996         if (!video)
1997                 return -ENOMEM;
1998
1999         /* a hack to fix the duplicate name "VID" problem on T61 */
2000         if (!strcmp(device->pnp.bus_id, "VID")) {
2001                 if (instance)
2002                         device->pnp.bus_id[3] = '0' + instance;
2003                 instance ++;
2004         }
2005         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2006         if (!strcmp(device->pnp.bus_id, "VGA")) {
2007                 if (instance)
2008                         device->pnp.bus_id[3] = '0' + instance;
2009                 instance++;
2010         }
2011
2012         video->device = device;
2013         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2014         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2015         device->driver_data = video;
2016
2017         acpi_video_bus_find_cap(video);
2018         error = acpi_video_bus_check(video);
2019         if (error)
2020                 goto err_free_video;
2021
2022         error = acpi_video_bus_add_fs(device);
2023         if (error)
2024                 goto err_free_video;
2025
2026         mutex_init(&video->device_list_lock);
2027         INIT_LIST_HEAD(&video->video_device_list);
2028
2029         acpi_video_bus_get_devices(video, device);
2030         acpi_video_bus_start_devices(video);
2031
2032         status = acpi_install_notify_handler(device->handle,
2033                                              ACPI_DEVICE_NOTIFY,
2034                                              acpi_video_bus_notify, video);
2035         if (ACPI_FAILURE(status)) {
2036                 printk(KERN_ERR PREFIX
2037                                   "Error installing notify handler\n");
2038                 error = -ENODEV;
2039                 goto err_stop_video;
2040         }
2041
2042         video->input = input = input_allocate_device();
2043         if (!input) {
2044                 error = -ENOMEM;
2045                 goto err_uninstall_notify;
2046         }
2047
2048         snprintf(video->phys, sizeof(video->phys),
2049                 "%s/video/input0", acpi_device_hid(video->device));
2050
2051         input->name = acpi_device_name(video->device);
2052         input->phys = video->phys;
2053         input->id.bustype = BUS_HOST;
2054         input->id.product = 0x06;
2055         input->dev.parent = &device->dev;
2056         input->evbit[0] = BIT(EV_KEY);
2057         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2058         set_bit(KEY_VIDEO_NEXT, input->keybit);
2059         set_bit(KEY_VIDEO_PREV, input->keybit);
2060         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2061         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2062         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2063         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2064         set_bit(KEY_DISPLAY_OFF, input->keybit);
2065         set_bit(KEY_UNKNOWN, input->keybit);
2066
2067         error = input_register_device(input);
2068         if (error)
2069                 goto err_free_input_dev;
2070
2071         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2072                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2073                video->flags.multihead ? "yes" : "no",
2074                video->flags.rom ? "yes" : "no",
2075                video->flags.post ? "yes" : "no");
2076
2077         return 0;
2078
2079  err_free_input_dev:
2080         input_free_device(input);
2081  err_uninstall_notify:
2082         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2083                                    acpi_video_bus_notify);
2084  err_stop_video:
2085         acpi_video_bus_stop_devices(video);
2086         acpi_video_bus_put_devices(video);
2087         kfree(video->attached_array);
2088         acpi_video_bus_remove_fs(device);
2089  err_free_video:
2090         kfree(video);
2091         device->driver_data = NULL;
2092
2093         return error;
2094 }
2095
2096 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2097 {
2098         acpi_status status = 0;
2099         struct acpi_video_bus *video = NULL;
2100
2101
2102         if (!device || !acpi_driver_data(device))
2103                 return -EINVAL;
2104
2105         video = acpi_driver_data(device);
2106
2107         acpi_video_bus_stop_devices(video);
2108
2109         status = acpi_remove_notify_handler(video->device->handle,
2110                                             ACPI_DEVICE_NOTIFY,
2111                                             acpi_video_bus_notify);
2112
2113         acpi_video_bus_put_devices(video);
2114         acpi_video_bus_remove_fs(device);
2115
2116         input_unregister_device(video->input);
2117         kfree(video->attached_array);
2118         kfree(video);
2119
2120         return 0;
2121 }
2122
2123 static int __init acpi_video_init(void)
2124 {
2125         int result = 0;
2126
2127         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2128         if (!acpi_video_dir)
2129                 return -ENODEV;
2130
2131         result = acpi_bus_register_driver(&acpi_video_bus);
2132         if (result < 0) {
2133                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2134                 return -ENODEV;
2135         }
2136
2137         return 0;
2138 }
2139
2140 static void __exit acpi_video_exit(void)
2141 {
2142
2143         acpi_bus_unregister_driver(&acpi_video_bus);
2144
2145         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2146
2147         return;
2148 }
2149
2150 module_init(acpi_video_init);
2151 module_exit(acpi_video_exit);