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   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/list.h>
  32 #include <linux/mutex.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/input.h>
  36 #include <linux/backlight.h>
  37 #include <linux/thermal.h>
  38 #include <linux/video_output.h>
  39 #include <asm/uaccess.h>
  40
  41 #include <acpi/acpi_bus.h>
  42 #include <acpi/acpi_drivers.h>
  43
  44 #define ACPI_VIDEO_CLASS                "video"
  45 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  46 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  47 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  48 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  49 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  50 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  51 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  52
  53 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  54 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  55 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  56 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  57 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  58
  59 #define MAX_NAME_LEN    20
  60
  61 #define ACPI_VIDEO_DISPLAY_CRT  1
  62 #define ACPI_VIDEO_DISPLAY_TV   2
  63 #define ACPI_VIDEO_DISPLAY_DVI  3
  64 #define ACPI_VIDEO_DISPLAY_LCD  4
  65
  66 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  67 ACPI_MODULE_NAME("video");
  68
  69 MODULE_AUTHOR("Bruno Ducrot");
  70 MODULE_DESCRIPTION("ACPI Video Driver");
  71 MODULE_LICENSE("GPL");
  72
  73 static int brightness_switch_enabled = 1;
  74 module_param(brightness_switch_enabled, bool, 0644);
  75
  76 static int acpi_video_bus_add(struct acpi_device *device);
  77 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  78 static int acpi_video_resume(struct acpi_device *device);
  79
  80 static const struct acpi_device_id video_device_ids[] = {
  81         {ACPI_VIDEO_HID, 0},
  82         {"", 0},
  83 };
  84 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  85
  86 static struct acpi_driver acpi_video_bus = {
  87         .name = "video",
  88         .class = ACPI_VIDEO_CLASS,
  89         .ids = video_device_ids,
  90         .ops = {
  91                 .add = acpi_video_bus_add,
  92                 .remove = acpi_video_bus_remove,
  93                 .resume = acpi_video_resume,
  94                 },
  95 };
  96
  97 struct acpi_video_bus_flags {
  98         u8 multihead:1;         /* can switch video heads */
  99         u8 rom:1;               /* can retrieve a video rom */
 100         u8 post:1;              /* can configure the head to */
 101         u8 reserved:5;
 102 };
 103
 104 struct acpi_video_bus_cap {
 105         u8 _DOS:1;              /*Enable/Disable output switching */
 106         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 107         u8 _ROM:1;              /*Get ROM Data */
 108         u8 _GPD:1;              /*Get POST Device */
 109         u8 _SPD:1;              /*Set POST Device */
 110         u8 _VPO:1;              /*Video POST Options */
 111         u8 reserved:2;
 112 };
 113
 114 struct acpi_video_device_attrib {
 115         u32 display_index:4;    /* A zero-based instance of the Display */
 116         u32 display_port_attachment:4;  /*This field differentiates the display type */
 117         u32 display_type:4;     /*Describe the specific type in use */
 118         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 119         u32 bios_can_detect:1;  /*BIOS can detect the device */
 120         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 121                                    the VGA device. */
 122         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 123         u32 reserved:10;        /*Must be 0 */
 124         u32 device_id_scheme:1; /*Device ID Scheme */
 125 };
 126
 127 struct acpi_video_enumerated_device {
 128         union {
 129                 u32 int_val;
 130                 struct acpi_video_device_attrib attrib;
 131         } value;
 132         struct acpi_video_device *bind_info;
 133 };
 134
 135 struct acpi_video_bus {
 136         struct acpi_device *device;
 137         u8 dos_setting;
 138         struct acpi_video_enumerated_device *attached_array;
 139         u8 attached_count;
 140         struct acpi_video_bus_cap cap;
 141         struct acpi_video_bus_flags flags;
 142         struct list_head video_device_list;
 143         struct mutex device_list_lock;  /* protects video_device_list */
 144         struct proc_dir_entry *dir;
 145         struct input_dev *input;
 146         char phys[32];  /* for input device */
 147 };
 148
 149 struct acpi_video_device_flags {
 150         u8 crt:1;
 151         u8 lcd:1;
 152         u8 tvout:1;
 153         u8 dvi:1;
 154         u8 bios:1;
 155         u8 unknown:1;
 156         u8 reserved:2;
 157 };
 158
 159 struct acpi_video_device_cap {
 160         u8 _ADR:1;              /*Return the unique ID */
 161         u8 _BCL:1;              /*Query list of brightness control levels supported */
 162         u8 _BCM:1;              /*Set the brightness level */
 163         u8 _BQC:1;              /* Get current brightness level */
 164         u8 _DDC:1;              /*Return the EDID for this device */
 165         u8 _DCS:1;              /*Return status of output device */
 166         u8 _DGS:1;              /*Query graphics state */
 167         u8 _DSS:1;              /*Device state set */
 168 };
 169
 170 struct acpi_video_device_brightness {
 171         int curr;
 172         int count;
 173         int *levels;
 174 };
 175
 176 struct acpi_video_device {
 177         unsigned long device_id;
 178         struct acpi_video_device_flags flags;
 179         struct acpi_video_device_cap cap;
 180         struct list_head entry;
 181         struct acpi_video_bus *video;
 182         struct acpi_device *dev;
 183         struct acpi_video_device_brightness *brightness;
 184         struct backlight_device *backlight;
 185         struct thermal_cooling_device *cdev;
 186         struct output_device *output_dev;
 187 };
 188
 189 /* bus */
 190 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 191 static struct file_operations acpi_video_bus_info_fops = {
 192         .owner = THIS_MODULE,
 193         .open = acpi_video_bus_info_open_fs,
 194         .read = seq_read,
 195         .llseek = seq_lseek,
 196         .release = single_release,
 197 };
 198
 199 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 200 static struct file_operations acpi_video_bus_ROM_fops = {
 201         .owner = THIS_MODULE,
 202         .open = acpi_video_bus_ROM_open_fs,
 203         .read = seq_read,
 204         .llseek = seq_lseek,
 205         .release = single_release,
 206 };
 207
 208 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 209                                             struct file *file);
 210 static struct file_operations acpi_video_bus_POST_info_fops = {
 211         .owner = THIS_MODULE,
 212         .open = acpi_video_bus_POST_info_open_fs,
 213         .read = seq_read,
 214         .llseek = seq_lseek,
 215         .release = single_release,
 216 };
 217
 218 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 219 static struct file_operations acpi_video_bus_POST_fops = {
 220         .owner = THIS_MODULE,
 221         .open = acpi_video_bus_POST_open_fs,
 222         .read = seq_read,
 223         .llseek = seq_lseek,
 224         .release = single_release,
 225 };
 226
 227 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 228 static struct file_operations acpi_video_bus_DOS_fops = {
 229         .owner = THIS_MODULE,
 230         .open = acpi_video_bus_DOS_open_fs,
 231         .read = seq_read,
 232         .llseek = seq_lseek,
 233         .release = single_release,
 234 };
 235
 236 /* device */
 237 static int acpi_video_device_info_open_fs(struct inode *inode,
 238                                           struct file *file);
 239 static struct file_operations acpi_video_device_info_fops = {
 240         .owner = THIS_MODULE,
 241         .open = acpi_video_device_info_open_fs,
 242         .read = seq_read,
 243         .llseek = seq_lseek,
 244         .release = single_release,
 245 };
 246
 247 static int acpi_video_device_state_open_fs(struct inode *inode,
 248                                            struct file *file);
 249 static struct file_operations acpi_video_device_state_fops = {
 250         .owner = THIS_MODULE,
 251         .open = acpi_video_device_state_open_fs,
 252         .read = seq_read,
 253         .llseek = seq_lseek,
 254         .release = single_release,
 255 };
 256
 257 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 258                                                 struct file *file);
 259 static struct file_operations acpi_video_device_brightness_fops = {
 260         .owner = THIS_MODULE,
 261         .open = acpi_video_device_brightness_open_fs,
 262         .read = seq_read,
 263         .llseek = seq_lseek,
 264         .release = single_release,
 265 };
 266
 267 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 268                                           struct file *file);
 269 static struct file_operations acpi_video_device_EDID_fops = {
 270         .owner = THIS_MODULE,
 271         .open = acpi_video_device_EDID_open_fs,
 272         .read = seq_read,
 273         .llseek = seq_lseek,
 274         .release = single_release,
 275 };
 276
 277 static char device_decode[][30] = {
 278         "motherboard VGA device",
 279         "PCI VGA device",
 280         "AGP VGA device",
 281         "UNKNOWN",
 282 };
 283
 284 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 285 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 286 static void acpi_video_device_bind(struct acpi_video_bus *video,
 287                                    struct acpi_video_device *device);
 288 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 289 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 290                         int level);
 291 static int acpi_video_device_lcd_get_level_current(
 292                         struct acpi_video_device *device,
 293                         unsigned long long *level);
 294 static int acpi_video_get_next_level(struct acpi_video_device *device,
 295                                      u32 level_current, u32 event);
 296 static void acpi_video_switch_brightness(struct acpi_video_device *device,
 297                                          int event);
 298 static int acpi_video_device_get_state(struct acpi_video_device *device,
 299                             unsigned long long *state);
 300 static int acpi_video_output_get(struct output_device *od);
 301 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 302
 303 /*backlight device sysfs support*/
 304 static int acpi_video_get_brightness(struct backlight_device *bd)
 305 {
 306         unsigned long long cur_level;
 307         int i;
 308         struct acpi_video_device *vd =
 309                 (struct acpi_video_device *)bl_get_data(bd);
 310         acpi_video_device_lcd_get_level_current(vd, &cur_level);
 311         for (i = 2; i < vd->brightness->count; i++) {
 312                 if (vd->brightness->levels[i] == cur_level)
 313                         /* The first two entries are special - see page 575
 314                            of the ACPI spec 3.0 */
 315                         return i-2;
 316         }
 317         return 0;
 318 }
 319
 320 static int acpi_video_set_brightness(struct backlight_device *bd)
 321 {
 322         int request_level = bd->props.brightness+2;
 323         struct acpi_video_device *vd =
 324                 (struct acpi_video_device *)bl_get_data(bd);
 325         acpi_video_device_lcd_set_level(vd,
 326                                         vd->brightness->levels[request_level]);
 327         return 0;
 328 }
 329
 330 static struct backlight_ops acpi_backlight_ops = {
 331         .get_brightness = acpi_video_get_brightness,
 332         .update_status  = acpi_video_set_brightness,
 333 };
 334
 335 /*video output device sysfs support*/
 336 static int acpi_video_output_get(struct output_device *od)
 337 {
 338         unsigned long long state;
 339         struct acpi_video_device *vd =
 340                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 341         acpi_video_device_get_state(vd, &state);
 342         return (int)state;
 343 }
 344
 345 static int acpi_video_output_set(struct output_device *od)
 346 {
 347         unsigned long state = od->request_state;
 348         struct acpi_video_device *vd=
 349                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 350         return acpi_video_device_set_state(vd, state);
 351 }
 352
 353 static struct output_properties acpi_output_properties = {
 354         .set_state = acpi_video_output_set,
 355         .get_status = acpi_video_output_get,
 356 };
 357
 358
 359 /* thermal cooling device callbacks */
 360 static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
 361 {
 362         struct acpi_device *device = cdev->devdata;
 363         struct acpi_video_device *video = acpi_driver_data(device);
 364
 365         return sprintf(buf, "%d\n", video->brightness->count - 3);
 366 }
 367
 368 static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
 369 {
 370         struct acpi_device *device = cdev->devdata;
 371         struct acpi_video_device *video = acpi_driver_data(device);
 372         unsigned long long level;
 373         int state;
 374
 375         acpi_video_device_lcd_get_level_current(video, &level);
 376         for (state = 2; state < video->brightness->count; state++)
 377                 if (level == video->brightness->levels[state])
 378                         return sprintf(buf, "%d\n",
 379                                        video->brightness->count - state - 1);
 380
 381         return -EINVAL;
 382 }
 383
 384 static int
 385 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)
 386 {
 387         struct acpi_device *device = cdev->devdata;
 388         struct acpi_video_device *video = acpi_driver_data(device);
 389         int level;
 390
 391         if ( state >= video->brightness->count - 2)
 392                 return -EINVAL;
 393
 394         state = video->brightness->count - state;
 395         level = video->brightness->levels[state -1];
 396         return acpi_video_device_lcd_set_level(video, level);
 397 }
 398
 399 static struct thermal_cooling_device_ops video_cooling_ops = {
 400         .get_max_state = video_get_max_state,
 401         .get_cur_state = video_get_cur_state,
 402         .set_cur_state = video_set_cur_state,
 403 };
 404
 405 /* --------------------------------------------------------------------------
 406                                Video Management
 407    -------------------------------------------------------------------------- */
 408
 409 /* device */
 410
 411 static int
 412 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
 413 {
 414         int status;
 415
 416         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 417
 418         return status;
 419 }
 420
 421 static int
 422 acpi_video_device_get_state(struct acpi_video_device *device,
 423                             unsigned long long *state)
 424 {
 425         int status;
 426
 427         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 428
 429         return status;
 430 }
 431
 432 static int
 433 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 434 {
 435         int status;
 436         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 437         struct acpi_object_list args = { 1, &arg0 };
 438         unsigned long long ret;
 439
 440
 441         arg0.integer.value = state;
 442         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 443
 444         return status;
 445 }
 446
 447 static int
 448 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 449                                    union acpi_object **levels)
 450 {
 451         int status;
 452         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 453         union acpi_object *obj;
 454
 455
 456         *levels = NULL;
 457
 458         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 459         if (!ACPI_SUCCESS(status))
 460                 return status;
 461         obj = (union acpi_object *)buffer.pointer;
 462         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 463                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 464                 status = -EFAULT;
 465                 goto err;
 466         }
 467
 468         *levels = obj;
 469
 470         return 0;
 471
 472       err:
 473         kfree(buffer.pointer);
 474
 475         return status;
 476 }
 477
 478 static int
 479 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 480 {
 481         int status = AE_OK;
 482         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 483         struct acpi_object_list args = { 1, &arg0 };
 484         int state;
 485
 486
 487         arg0.integer.value = level;
 488
 489         if (device->cap._BCM)
 490                 status = acpi_evaluate_object(device->dev->handle, "_BCM",
 491                                               &args, NULL);
 492         device->brightness->curr = level;
 493         for (state = 2; state < device->brightness->count; state++)
 494                 if (level == device->brightness->levels[state])
 495                         device->backlight->props.brightness = state - 2;
 496
 497         return status;
 498 }
 499
 500 static int
 501 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 502                                         unsigned long long *level)
 503 {
 504         if (device->cap._BQC)
 505                 return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
 506                                              level);
 507         *level = device->brightness->curr;
 508         return AE_OK;
 509 }
 510
 511 static int
 512 acpi_video_device_EDID(struct acpi_video_device *device,
 513                        union acpi_object **edid, ssize_t length)
 514 {
 515         int status;
 516         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 517         union acpi_object *obj;
 518         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 519         struct acpi_object_list args = { 1, &arg0 };
 520
 521
 522         *edid = NULL;
 523
 524         if (!device)
 525                 return -ENODEV;
 526         if (length == 128)
 527                 arg0.integer.value = 1;
 528         else if (length == 256)
 529                 arg0.integer.value = 2;
 530         else
 531                 return -EINVAL;
 532
 533         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 534         if (ACPI_FAILURE(status))
 535                 return -ENODEV;
 536
 537         obj = buffer.pointer;
 538
 539         if (obj && obj->type == ACPI_TYPE_BUFFER)
 540                 *edid = obj;
 541         else {
 542                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 543                 status = -EFAULT;
 544                 kfree(obj);
 545         }
 546
 547         return status;
 548 }
 549
 550 /* bus */
 551
 552 static int
 553 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 554 {
 555         int status;
 556         unsigned long long tmp;
 557         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 558         struct acpi_object_list args = { 1, &arg0 };
 559
 560
 561         arg0.integer.value = option;
 562
 563         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 564         if (ACPI_SUCCESS(status))
 565                 status = tmp ? (-EINVAL) : (AE_OK);
 566
 567         return status;
 568 }
 569
 570 static int
 571 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
 572 {
 573         int status;
 574
 575         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 576
 577         return status;
 578 }
 579
 580 static int
 581 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 582                             unsigned long long *options)
 583 {
 584         int status;
 585
 586         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 587         *options &= 3;
 588
 589         return status;
 590 }
 591
 592 /*
 593  *  Arg:
 594  *      video           : video bus device pointer
 595  *      bios_flag       :
 596  *              0.      The system BIOS should NOT automatically switch(toggle)
 597  *                      the active display output.
 598  *              1.      The system BIOS should automatically switch (toggle) the
 599  *                      active display output. No switch event.
 600  *              2.      The _DGS value should be locked.
 601  *              3.      The system BIOS should not automatically switch (toggle) the
 602  *                      active display output, but instead generate the display switch
 603  *                      event notify code.
 604  *      lcd_flag        :
 605  *              0.      The system BIOS should automatically control the brightness level
 606  *                      of the LCD when the power changes from AC to DC
 607  *              1.      The system BIOS should NOT automatically control the brightness
 608  *                      level of the LCD when the power changes from AC to DC.
 609  * Return Value:
 610  *              -1      wrong arg.
 611  */
 612
 613 static int
 614 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 615 {
 616         acpi_integer status = 0;
 617         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 618         struct acpi_object_list args = { 1, &arg0 };
 619
 620
 621         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 622                 status = -1;
 623                 goto Failed;
 624         }
 625         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 626         video->dos_setting = arg0.integer.value;
 627         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 628
 629       Failed:
 630         return status;
 631 }
 632
 633 /*
 634  *  Arg:
 635  *      device  : video output device (LCD, CRT, ..)
 636  *
 637  *  Return Value:
 638  *      Maximum brightness level
 639  *
 640  *  Allocate and initialize device->brightness.
 641  */
 642
 643 static int
 644 acpi_video_init_brightness(struct acpi_video_device *device)
 645 {
 646         union acpi_object *obj = NULL;
 647         int i, max_level = 0, count = 0;
 648         union acpi_object *o;
 649         struct acpi_video_device_brightness *br = NULL;
 650
 651         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 652                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 653                                                 "LCD brightness level\n"));
 654                 goto out;
 655         }
 656
 657         if (obj->package.count < 2)
 658                 goto out;
 659
 660         br = kzalloc(sizeof(*br), GFP_KERNEL);
 661         if (!br) {
 662                 printk(KERN_ERR "can't allocate memory\n");
 663                 goto out;
 664         }
 665
 666         br->levels = kmalloc(obj->package.count * sizeof *(br->levels),
 667                                 GFP_KERNEL);
 668         if (!br->levels)
 669                 goto out_free;
 670
 671         for (i = 0; i < obj->package.count; i++) {
 672                 o = (union acpi_object *)&obj->package.elements[i];
 673                 if (o->type != ACPI_TYPE_INTEGER) {
 674                         printk(KERN_ERR PREFIX "Invalid data\n");
 675                         continue;
 676                 }
 677                 br->levels[count] = (u32) o->integer.value;
 678
 679                 if (br->levels[count] > max_level)
 680                         max_level = br->levels[count];
 681                 count++;
 682         }
 683
 684         if (count < 2)
 685                 goto out_free_levels;
 686
 687         br->count = count;
 688         device->brightness = br;
 689         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "found %d brightness levels\n", count));
 690         kfree(obj);
 691         return max_level;
 692
 693 out_free_levels:
 694         kfree(br->levels);
 695 out_free:
 696         kfree(br);
 697 out:
 698         device->brightness = NULL;
 699         kfree(obj);
 700         return 0;
 701 }
 702
 703 /*
 704  *  Arg:
 705  *      device  : video output device (LCD, CRT, ..)
 706  *
 707  *  Return Value:
 708  *      None
 709  *
 710  *  Find out all required AML methods defined under the output
 711  *  device.
 712  */
 713
 714 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 715 {
 716         acpi_handle h_dummy1;
 717         u32 max_level = 0;
 718
 719
 720         memset(&device->cap, 0, sizeof(device->cap));
 721
 722         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 723                 device->cap._ADR = 1;
 724         }
 725         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 726                 device->cap._BCL = 1;
 727         }
 728         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 729                 device->cap._BCM = 1;
 730         }
 731         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 732                 device->cap._BQC = 1;
 733         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 734                 device->cap._DDC = 1;
 735         }
 736         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 737                 device->cap._DCS = 1;
 738         }
 739         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 740                 device->cap._DGS = 1;
 741         }
 742         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 743                 device->cap._DSS = 1;
 744         }
 745
 746         if (acpi_video_backlight_support())
 747                 max_level = acpi_video_init_brightness(device);
 748
 749         if (device->cap._BCL && device->cap._BCM && max_level > 0) {
 750                 int result;
 751                 static int count = 0;
 752                 char *name;
 753                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 754                 if (!name)
 755                         return;
 756
 757                 sprintf(name, "acpi_video%d", count++);
 758                 device->backlight = backlight_device_register(name,
 759                         NULL, device, &acpi_backlight_ops);
 760                 device->backlight->props.max_brightness = device->brightness->count-3;
 761                 /*
 762                  * If there exists the _BQC object, the _BQC object will be
 763                  * called to get the current backlight brightness. Otherwise
 764                  * the brightness will be set to the maximum.
 765                  */
 766                 if (device->cap._BQC)
 767                         device->backlight->props.brightness =
 768                                 acpi_video_get_brightness(device->backlight);
 769                 else
 770                         device->backlight->props.brightness =
 771                                 device->backlight->props.max_brightness;
 772                 backlight_update_status(device->backlight);
 773                 kfree(name);
 774
 775                 device->cdev = thermal_cooling_device_register("LCD",
 776                                         device->dev, &video_cooling_ops);
 777                 if (IS_ERR(device->cdev))
 778                         return;
 779
 780                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 781                          device->cdev->id);
 782                 result = sysfs_create_link(&device->dev->dev.kobj,
 783                                 &device->cdev->device.kobj,
 784                                 "thermal_cooling");
 785                 if (result)
 786                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 787                 result = sysfs_create_link(&device->cdev->device.kobj,
 788                                 &device->dev->dev.kobj, "device");
 789                 if (result)
 790                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 791
 792         }
 793
 794         if (acpi_video_display_switch_support()) {
 795
 796                 if (device->cap._DCS && device->cap._DSS) {
 797                         static int count;
 798                         char *name;
 799                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 800                         if (!name)
 801                                 return;
 802                         sprintf(name, "acpi_video%d", count++);
 803                         device->output_dev = video_output_register(name,
 804                                         NULL, device, &acpi_output_properties);
 805                         kfree(name);
 806                 }
 807         }
 808 }
 809
 810 /*
 811  *  Arg:
 812  *      device  : video output device (VGA)
 813  *
 814  *  Return Value:
 815  *      None
 816  *
 817  *  Find out all required AML methods defined under the video bus device.
 818  */
 819
 820 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 821 {
 822         acpi_handle h_dummy1;
 823
 824         memset(&video->cap, 0, sizeof(video->cap));
 825         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 826                 video->cap._DOS = 1;
 827         }
 828         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 829                 video->cap._DOD = 1;
 830         }
 831         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 832                 video->cap._ROM = 1;
 833         }
 834         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 835                 video->cap._GPD = 1;
 836         }
 837         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 838                 video->cap._SPD = 1;
 839         }
 840         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 841                 video->cap._VPO = 1;
 842         }
 843 }
 844
 845 /*
 846  * Check whether the video bus device has required AML method to
 847  * support the desired features
 848  */
 849
 850 static int acpi_video_bus_check(struct acpi_video_bus *video)
 851 {
 852         acpi_status status = -ENOENT;
 853         struct device *dev;
 854
 855         if (!video)
 856                 return -EINVAL;
 857
 858         dev = acpi_get_physical_pci_device(video->device->handle);
 859         if (!dev)
 860                 return -ENODEV;
 861         put_device(dev);
 862
 863         /* Since there is no HID, CID and so on for VGA driver, we have
 864          * to check well known required nodes.
 865          */
 866
 867         /* Does this device support video switching? */
 868         if (video->cap._DOS) {
 869                 video->flags.multihead = 1;
 870                 status = 0;
 871         }
 872
 873         /* Does this device support retrieving a video ROM? */
 874         if (video->cap._ROM) {
 875                 video->flags.rom = 1;
 876                 status = 0;
 877         }
 878
 879         /* Does this device support configuring which video device to POST? */
 880         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 881                 video->flags.post = 1;
 882                 status = 0;
 883         }
 884
 885         return status;
 886 }
 887
 888 /* --------------------------------------------------------------------------
 889                               FS Interface (/proc)
 890    -------------------------------------------------------------------------- */
 891
 892 static struct proc_dir_entry *acpi_video_dir;
 893
 894 /* video devices */
 895
 896 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
 897 {
 898         struct acpi_video_device *dev = seq->private;
 899
 900
 901         if (!dev)
 902                 goto end;
 903
 904         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
 905         seq_printf(seq, "type:         ");
 906         if (dev->flags.crt)
 907                 seq_printf(seq, "CRT\n");
 908         else if (dev->flags.lcd)
 909                 seq_printf(seq, "LCD\n");
 910         else if (dev->flags.tvout)
 911                 seq_printf(seq, "TVOUT\n");
 912         else if (dev->flags.dvi)
 913                 seq_printf(seq, "DVI\n");
 914         else
 915                 seq_printf(seq, "UNKNOWN\n");
 916
 917         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
 918
 919       end:
 920         return 0;
 921 }
 922
 923 static int
 924 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
 925 {
 926         return single_open(file, acpi_video_device_info_seq_show,
 927                            PDE(inode)->data);
 928 }
 929
 930 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
 931 {
 932         int status;
 933         struct acpi_video_device *dev = seq->private;
 934         unsigned long long state;
 935
 936
 937         if (!dev)
 938                 goto end;
 939
 940         status = acpi_video_device_get_state(dev, &state);
 941         seq_printf(seq, "state:     ");
 942         if (ACPI_SUCCESS(status))
 943                 seq_printf(seq, "0x%02llx\n", state);
 944         else
 945                 seq_printf(seq, "<not supported>\n");
 946
 947         status = acpi_video_device_query(dev, &state);
 948         seq_printf(seq, "query:     ");
 949         if (ACPI_SUCCESS(status))
 950                 seq_printf(seq, "0x%02llx\n", state);
 951         else
 952                 seq_printf(seq, "<not supported>\n");
 953
 954       end:
 955         return 0;
 956 }
 957
 958 static int
 959 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
 960 {
 961         return single_open(file, acpi_video_device_state_seq_show,
 962                            PDE(inode)->data);
 963 }
 964
 965 static ssize_t
 966 acpi_video_device_write_state(struct file *file,
 967                               const char __user * buffer,
 968                               size_t count, loff_t * data)
 969 {
 970         int status;
 971         struct seq_file *m = file->private_data;
 972         struct acpi_video_device *dev = m->private;
 973         char str[12] = { 0 };
 974         u32 state = 0;
 975
 976
 977         if (!dev || count + 1 > sizeof str)
 978                 return -EINVAL;
 979
 980         if (copy_from_user(str, buffer, count))
 981                 return -EFAULT;
 982
 983         str[count] = 0;
 984         state = simple_strtoul(str, NULL, 0);
 985         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
 986
 987         status = acpi_video_device_set_state(dev, state);
 988
 989         if (status)
 990                 return -EFAULT;
 991
 992         return count;
 993 }
 994
 995 static int
 996 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
 997 {
 998         struct acpi_video_device *dev = seq->private;
 999         int i;
1000
1001
1002         if (!dev || !dev->brightness) {
1003                 seq_printf(seq, "<not supported>\n");
1004                 return 0;
1005         }
1006
1007         seq_printf(seq, "levels: ");
1008         for (i = 0; i < dev->brightness->count; i++)
1009                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1010         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1011
1012         return 0;
1013 }
1014
1015 static int
1016 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1017 {
1018         return single_open(file, acpi_video_device_brightness_seq_show,
1019                            PDE(inode)->data);
1020 }
1021
1022 static ssize_t
1023 acpi_video_device_write_brightness(struct file *file,
1024                                    const char __user * buffer,
1025                                    size_t count, loff_t * data)
1026 {
1027         struct seq_file *m = file->private_data;
1028         struct acpi_video_device *dev = m->private;
1029         char str[5] = { 0 };
1030         unsigned int level = 0;
1031         int i;
1032
1033
1034         if (!dev || !dev->brightness || count + 1 > sizeof str)
1035                 return -EINVAL;
1036
1037         if (copy_from_user(str, buffer, count))
1038                 return -EFAULT;
1039
1040         str[count] = 0;
1041         level = simple_strtoul(str, NULL, 0);
1042
1043         if (level > 100)
1044                 return -EFAULT;
1045
1046         /* validate through the list of available levels */
1047         for (i = 0; i < dev->brightness->count; i++)
1048                 if (level == dev->brightness->levels[i]) {
1049                         if (ACPI_SUCCESS
1050                             (acpi_video_device_lcd_set_level(dev, level)))
1051                                 dev->brightness->curr = level;
1052                         break;
1053                 }
1054
1055         return count;
1056 }
1057
1058 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1059 {
1060         struct acpi_video_device *dev = seq->private;
1061         int status;
1062         int i;
1063         union acpi_object *edid = NULL;
1064
1065
1066         if (!dev)
1067                 goto out;
1068
1069         status = acpi_video_device_EDID(dev, &edid, 128);
1070         if (ACPI_FAILURE(status)) {
1071                 status = acpi_video_device_EDID(dev, &edid, 256);
1072         }
1073
1074         if (ACPI_FAILURE(status)) {
1075                 goto out;
1076         }
1077
1078         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1079                 for (i = 0; i < edid->buffer.length; i++)
1080                         seq_putc(seq, edid->buffer.pointer[i]);
1081         }
1082
1083       out:
1084         if (!edid)
1085                 seq_printf(seq, "<not supported>\n");
1086         else
1087                 kfree(edid);
1088
1089         return 0;
1090 }
1091
1092 static int
1093 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1094 {
1095         return single_open(file, acpi_video_device_EDID_seq_show,
1096                            PDE(inode)->data);
1097 }
1098
1099 static int acpi_video_device_add_fs(struct acpi_device *device)
1100 {
1101         struct proc_dir_entry *entry, *device_dir;
1102         struct acpi_video_device *vid_dev;
1103
1104         vid_dev = acpi_driver_data(device);
1105         if (!vid_dev)
1106                 return -ENODEV;
1107
1108         device_dir = proc_mkdir(acpi_device_bid(device),
1109                                 vid_dev->video->dir);
1110         if (!device_dir)
1111                 return -ENOMEM;
1112
1113         device_dir->owner = THIS_MODULE;
1114
1115         /* 'info' [R] */
1116         entry = proc_create_data("info", S_IRUGO, device_dir,
1117                         &acpi_video_device_info_fops, acpi_driver_data(device));
1118         if (!entry)
1119                 goto err_remove_dir;
1120
1121         /* 'state' [R/W] */
1122         acpi_video_device_state_fops.write = acpi_video_device_write_state;
1123         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1124                                  device_dir,
1125                                  &acpi_video_device_state_fops,
1126                                  acpi_driver_data(device));
1127         if (!entry)
1128                 goto err_remove_info;
1129
1130         /* 'brightness' [R/W] */
1131         acpi_video_device_brightness_fops.write =
1132                 acpi_video_device_write_brightness;
1133         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1134                                  device_dir,
1135                                  &acpi_video_device_brightness_fops,
1136                                  acpi_driver_data(device));
1137         if (!entry)
1138                 goto err_remove_state;
1139
1140         /* 'EDID' [R] */
1141         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1142                                  &acpi_video_device_EDID_fops,
1143                                  acpi_driver_data(device));
1144         if (!entry)
1145                 goto err_remove_brightness;
1146
1147         acpi_device_dir(device) = device_dir;
1148
1149         return 0;
1150
1151  err_remove_brightness:
1152         remove_proc_entry("brightness", device_dir);
1153  err_remove_state:
1154         remove_proc_entry("state", device_dir);
1155  err_remove_info:
1156         remove_proc_entry("info", device_dir);
1157  err_remove_dir:
1158         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1159         return -ENOMEM;
1160 }
1161
1162 static int acpi_video_device_remove_fs(struct acpi_device *device)
1163 {
1164         struct acpi_video_device *vid_dev;
1165         struct proc_dir_entry *device_dir;
1166
1167         vid_dev = acpi_driver_data(device);
1168         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1169                 return -ENODEV;
1170
1171         device_dir = acpi_device_dir(device);
1172         if (device_dir) {
1173                 remove_proc_entry("info", device_dir);
1174                 remove_proc_entry("state", device_dir);
1175                 remove_proc_entry("brightness", device_dir);
1176                 remove_proc_entry("EDID", device_dir);
1177                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1178                 acpi_device_dir(device) = NULL;
1179         }
1180
1181         return 0;
1182 }
1183
1184 /* video bus */
1185 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1186 {
1187         struct acpi_video_bus *video = seq->private;
1188
1189
1190         if (!video)
1191                 goto end;
1192
1193         seq_printf(seq, "Switching heads:              %s\n",
1194                    video->flags.multihead ? "yes" : "no");
1195         seq_printf(seq, "Video ROM:                    %s\n",
1196                    video->flags.rom ? "yes" : "no");
1197         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1198                    video->flags.post ? "yes" : "no");
1199
1200       end:
1201         return 0;
1202 }
1203
1204 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1205 {
1206         return single_open(file, acpi_video_bus_info_seq_show,
1207                            PDE(inode)->data);
1208 }
1209
1210 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1211 {
1212         struct acpi_video_bus *video = seq->private;
1213
1214
1215         if (!video)
1216                 goto end;
1217
1218         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1219         seq_printf(seq, "<TODO>\n");
1220
1221       end:
1222         return 0;
1223 }
1224
1225 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1226 {
1227         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1228 }
1229
1230 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1231 {
1232         struct acpi_video_bus *video = seq->private;
1233         unsigned long long options;
1234         int status;
1235
1236
1237         if (!video)
1238                 goto end;
1239
1240         status = acpi_video_bus_POST_options(video, &options);
1241         if (ACPI_SUCCESS(status)) {
1242                 if (!(options & 1)) {
1243                         printk(KERN_WARNING PREFIX
1244                                "The motherboard VGA device is not listed as a possible POST device.\n");
1245                         printk(KERN_WARNING PREFIX
1246                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1247                 }
1248                 printk("%llx\n", options);
1249                 seq_printf(seq, "can POST: <integrated video>");
1250                 if (options & 2)
1251                         seq_printf(seq, " <PCI video>");
1252                 if (options & 4)
1253                         seq_printf(seq, " <AGP video>");
1254                 seq_putc(seq, '\n');
1255         } else
1256                 seq_printf(seq, "<not supported>\n");
1257       end:
1258         return 0;
1259 }
1260
1261 static int
1262 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1263 {
1264         return single_open(file, acpi_video_bus_POST_info_seq_show,
1265                            PDE(inode)->data);
1266 }
1267
1268 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1269 {
1270         struct acpi_video_bus *video = seq->private;
1271         int status;
1272         unsigned long long id;
1273
1274
1275         if (!video)
1276                 goto end;
1277
1278         status = acpi_video_bus_get_POST(video, &id);
1279         if (!ACPI_SUCCESS(status)) {
1280                 seq_printf(seq, "<not supported>\n");
1281                 goto end;
1282         }
1283         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1284
1285       end:
1286         return 0;
1287 }
1288
1289 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1290 {
1291         struct acpi_video_bus *video = seq->private;
1292
1293
1294         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1295
1296         return 0;
1297 }
1298
1299 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1300 {
1301         return single_open(file, acpi_video_bus_POST_seq_show,
1302                            PDE(inode)->data);
1303 }
1304
1305 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1306 {
1307         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1308 }
1309
1310 static ssize_t
1311 acpi_video_bus_write_POST(struct file *file,
1312                           const char __user * buffer,
1313                           size_t count, loff_t * data)
1314 {
1315         int status;
1316         struct seq_file *m = file->private_data;
1317         struct acpi_video_bus *video = m->private;
1318         char str[12] = { 0 };
1319         unsigned long long opt, options;
1320
1321
1322         if (!video || count + 1 > sizeof str)
1323                 return -EINVAL;
1324
1325         status = acpi_video_bus_POST_options(video, &options);
1326         if (!ACPI_SUCCESS(status))
1327                 return -EINVAL;
1328
1329         if (copy_from_user(str, buffer, count))
1330                 return -EFAULT;
1331
1332         str[count] = 0;
1333         opt = strtoul(str, NULL, 0);
1334         if (opt > 3)
1335                 return -EFAULT;
1336
1337         /* just in case an OEM 'forgot' the motherboard... */
1338         options |= 1;
1339
1340         if (options & (1ul << opt)) {
1341                 status = acpi_video_bus_set_POST(video, opt);
1342                 if (!ACPI_SUCCESS(status))
1343                         return -EFAULT;
1344
1345         }
1346
1347         return count;
1348 }
1349
1350 static ssize_t
1351 acpi_video_bus_write_DOS(struct file *file,
1352                          const char __user * buffer,
1353                          size_t count, loff_t * data)
1354 {
1355         int status;
1356         struct seq_file *m = file->private_data;
1357         struct acpi_video_bus *video = m->private;
1358         char str[12] = { 0 };
1359         unsigned long opt;
1360
1361
1362         if (!video || count + 1 > sizeof str)
1363                 return -EINVAL;
1364
1365         if (copy_from_user(str, buffer, count))
1366                 return -EFAULT;
1367
1368         str[count] = 0;
1369         opt = strtoul(str, NULL, 0);
1370         if (opt > 7)
1371                 return -EFAULT;
1372
1373         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1374
1375         if (!ACPI_SUCCESS(status))
1376                 return -EFAULT;
1377
1378         return count;
1379 }
1380
1381 static int acpi_video_bus_add_fs(struct acpi_device *device)
1382 {
1383         struct acpi_video_bus *video = acpi_driver_data(device);
1384         struct proc_dir_entry *device_dir;
1385         struct proc_dir_entry *entry;
1386
1387         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1388         if (!device_dir)
1389                 return -ENOMEM;
1390
1391         device_dir->owner = THIS_MODULE;
1392
1393         /* 'info' [R] */
1394         entry = proc_create_data("info", S_IRUGO, device_dir,
1395                                  &acpi_video_bus_info_fops,
1396                                  acpi_driver_data(device));
1397         if (!entry)
1398                 goto err_remove_dir;
1399
1400         /* 'ROM' [R] */
1401         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1402                                  &acpi_video_bus_ROM_fops,
1403                                  acpi_driver_data(device));
1404         if (!entry)
1405                 goto err_remove_info;
1406
1407         /* 'POST_info' [R] */
1408         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1409                                  &acpi_video_bus_POST_info_fops,
1410                                  acpi_driver_data(device));
1411         if (!entry)
1412                 goto err_remove_rom;
1413
1414         /* 'POST' [R/W] */
1415         acpi_video_bus_POST_fops.write = acpi_video_bus_write_POST;
1416         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1417                                  device_dir,
1418                                  &acpi_video_bus_POST_fops,
1419                                  acpi_driver_data(device));
1420         if (!entry)
1421                 goto err_remove_post_info;
1422
1423         /* 'DOS' [R/W] */
1424         acpi_video_bus_DOS_fops.write = acpi_video_bus_write_DOS;
1425         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1426                                  device_dir,
1427                                  &acpi_video_bus_DOS_fops,
1428                                  acpi_driver_data(device));
1429         if (!entry)
1430                 goto err_remove_post;
1431
1432         video->dir = acpi_device_dir(device) = device_dir;
1433         return 0;
1434
1435  err_remove_post:
1436         remove_proc_entry("POST", device_dir);
1437  err_remove_post_info:
1438         remove_proc_entry("POST_info", device_dir);
1439  err_remove_rom:
1440         remove_proc_entry("ROM", device_dir);
1441  err_remove_info:
1442         remove_proc_entry("info", device_dir);
1443  err_remove_dir:
1444         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1445         return -ENOMEM;
1446 }
1447
1448 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1449 {
1450         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1451
1452         if (device_dir) {
1453                 remove_proc_entry("info", device_dir);
1454                 remove_proc_entry("ROM", device_dir);
1455                 remove_proc_entry("POST_info", device_dir);
1456                 remove_proc_entry("POST", device_dir);
1457                 remove_proc_entry("DOS", device_dir);
1458                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1459                 acpi_device_dir(device) = NULL;
1460         }
1461
1462         return 0;
1463 }
1464
1465 /* --------------------------------------------------------------------------
1466                                  Driver Interface
1467    -------------------------------------------------------------------------- */
1468
1469 /* device interface */
1470 static struct acpi_video_device_attrib*
1471 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1472 {
1473         struct acpi_video_enumerated_device *ids;
1474         int i;
1475
1476         for (i = 0; i < video->attached_count; i++) {
1477                 ids = &video->attached_array[i];
1478                 if ((ids->value.int_val & 0xffff) == device_id)
1479                         return &ids->value.attrib;
1480         }
1481
1482         return NULL;
1483 }
1484
1485 static int
1486 acpi_video_bus_get_one_device(struct acpi_device *device,
1487                               struct acpi_video_bus *video)
1488 {
1489         unsigned long long device_id;
1490         int status;
1491         struct acpi_video_device *data;
1492         struct acpi_video_device_attrib* attribute;
1493
1494         if (!device || !video)
1495                 return -EINVAL;
1496
1497         status =
1498             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1499         if (ACPI_SUCCESS(status)) {
1500
1501                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1502                 if (!data)
1503                         return -ENOMEM;
1504
1505                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1506                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1507                 device->driver_data = data;
1508
1509                 data->device_id = device_id;
1510                 data->video = video;
1511                 data->dev = device;
1512
1513                 attribute = acpi_video_get_device_attr(video, device_id);
1514
1515                 if((attribute != NULL) && attribute->device_id_scheme) {
1516                         switch (attribute->display_type) {
1517                         case ACPI_VIDEO_DISPLAY_CRT:
1518                                 data->flags.crt = 1;
1519                                 break;
1520                         case ACPI_VIDEO_DISPLAY_TV:
1521                                 data->flags.tvout = 1;
1522                                 break;
1523                         case ACPI_VIDEO_DISPLAY_DVI:
1524                                 data->flags.dvi = 1;
1525                                 break;
1526                         case ACPI_VIDEO_DISPLAY_LCD:
1527                                 data->flags.lcd = 1;
1528                                 break;
1529                         default:
1530                                 data->flags.unknown = 1;
1531                                 break;
1532                         }
1533                         if(attribute->bios_can_detect)
1534                                 data->flags.bios = 1;
1535                 } else
1536                         data->flags.unknown = 1;
1537
1538                 acpi_video_device_bind(video, data);
1539                 acpi_video_device_find_cap(data);
1540
1541                 status = acpi_install_notify_handler(device->handle,
1542                                                      ACPI_DEVICE_NOTIFY,
1543                                                      acpi_video_device_notify,
1544                                                      data);
1545                 if (ACPI_FAILURE(status)) {
1546                         printk(KERN_ERR PREFIX
1547                                           "Error installing notify handler\n");
1548                         if(data->brightness)
1549                                 kfree(data->brightness->levels);
1550                         kfree(data->brightness);
1551                         kfree(data);
1552                         return -ENODEV;
1553                 }
1554
1555                 mutex_lock(&video->device_list_lock);
1556                 list_add_tail(&data->entry, &video->video_device_list);
1557                 mutex_unlock(&video->device_list_lock);
1558
1559                 acpi_video_device_add_fs(device);
1560
1561                 return 0;
1562         }
1563
1564         return -ENOENT;
1565 }
1566
1567 /*
1568  *  Arg:
1569  *      video   : video bus device
1570  *
1571  *  Return:
1572  *      none
1573  *
1574  *  Enumerate the video device list of the video bus,
1575  *  bind the ids with the corresponding video devices
1576  *  under the video bus.
1577  */
1578
1579 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1580 {
1581         struct acpi_video_device *dev;
1582
1583         mutex_lock(&video->device_list_lock);
1584
1585         list_for_each_entry(dev, &video->video_device_list, entry)
1586                 acpi_video_device_bind(video, dev);
1587
1588         mutex_unlock(&video->device_list_lock);
1589 }
1590
1591 /*
1592  *  Arg:
1593  *      video   : video bus device
1594  *      device  : video output device under the video
1595  *              bus
1596  *
1597  *  Return:
1598  *      none
1599  *
1600  *  Bind the ids with the corresponding video devices
1601  *  under the video bus.
1602  */
1603
1604 static void
1605 acpi_video_device_bind(struct acpi_video_bus *video,
1606                        struct acpi_video_device *device)
1607 {
1608         struct acpi_video_enumerated_device *ids;
1609         int i;
1610
1611         for (i = 0; i < video->attached_count; i++) {
1612                 ids = &video->attached_array[i];
1613                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1614                         ids->bind_info = device;
1615                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1616                 }
1617         }
1618 }
1619
1620 /*
1621  *  Arg:
1622  *      video   : video bus device
1623  *
1624  *  Return:
1625  *      < 0     : error
1626  *
1627  *  Call _DOD to enumerate all devices attached to display adapter
1628  *
1629  */
1630
1631 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1632 {
1633         int status;
1634         int count;
1635         int i;
1636         struct acpi_video_enumerated_device *active_list;
1637         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1638         union acpi_object *dod = NULL;
1639         union acpi_object *obj;
1640
1641         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1642         if (!ACPI_SUCCESS(status)) {
1643                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1644                 return status;
1645         }
1646
1647         dod = buffer.pointer;
1648         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1649                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1650                 status = -EFAULT;
1651                 goto out;
1652         }
1653
1654         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1655                           dod->package.count));
1656
1657         active_list = kcalloc(1 + dod->package.count,
1658                               sizeof(struct acpi_video_enumerated_device),
1659                               GFP_KERNEL);
1660         if (!active_list) {
1661                 status = -ENOMEM;
1662                 goto out;
1663         }
1664
1665         count = 0;
1666         for (i = 0; i < dod->package.count; i++) {
1667                 obj = &dod->package.elements[i];
1668
1669                 if (obj->type != ACPI_TYPE_INTEGER) {
1670                         printk(KERN_ERR PREFIX
1671                                 "Invalid _DOD data in element %d\n", i);
1672                         continue;
1673                 }
1674
1675                 active_list[count].value.int_val = obj->integer.value;
1676                 active_list[count].bind_info = NULL;
1677                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1678                                   (int)obj->integer.value));
1679                 count++;
1680         }
1681
1682         kfree(video->attached_array);
1683
1684         video->attached_array = active_list;
1685         video->attached_count = count;
1686
1687  out:
1688         kfree(buffer.pointer);
1689         return status;
1690 }
1691
1692 static int
1693 acpi_video_get_next_level(struct acpi_video_device *device,
1694                           u32 level_current, u32 event)
1695 {
1696         int min, max, min_above, max_below, i, l, delta = 255;
1697         max = max_below = 0;
1698         min = min_above = 255;
1699         /* Find closest level to level_current */
1700         for (i = 0; i < device->brightness->count; i++) {
1701                 l = device->brightness->levels[i];
1702                 if (abs(l - level_current) < abs(delta)) {
1703                         delta = l - level_current;
1704                         if (!delta)
1705                                 break;
1706                 }
1707         }
1708         /* Ajust level_current to closest available level */
1709         level_current += delta;
1710         for (i = 0; i < device->brightness->count; i++) {
1711                 l = device->brightness->levels[i];
1712                 if (l < min)
1713                         min = l;
1714                 if (l > max)
1715                         max = l;
1716                 if (l < min_above && l > level_current)
1717                         min_above = l;
1718                 if (l > max_below && l < level_current)
1719                         max_below = l;
1720         }
1721
1722         switch (event) {
1723         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1724                 return (level_current < max) ? min_above : min;
1725         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1726                 return (level_current < max) ? min_above : max;
1727         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1728                 return (level_current > min) ? max_below : min;
1729         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1730         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1731                 return 0;
1732         default:
1733                 return level_current;
1734         }
1735 }
1736
1737 static void
1738 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1739 {
1740         unsigned long long level_current, level_next;
1741         if (!device->brightness)
1742                 return;
1743         acpi_video_device_lcd_get_level_current(device, &level_current);
1744         level_next = acpi_video_get_next_level(device, level_current, event);
1745         acpi_video_device_lcd_set_level(device, level_next);
1746 }
1747
1748 static int
1749 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1750                            struct acpi_device *device)
1751 {
1752         int status = 0;
1753         struct acpi_device *dev;
1754
1755         acpi_video_device_enumerate(video);
1756
1757         list_for_each_entry(dev, &device->children, node) {
1758
1759                 status = acpi_video_bus_get_one_device(dev, video);
1760                 if (ACPI_FAILURE(status)) {
1761                         printk(KERN_WARNING PREFIX
1762                                         "Cant attach device");
1763                         continue;
1764                 }
1765         }
1766         return status;
1767 }
1768
1769 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1770 {
1771         acpi_status status;
1772         struct acpi_video_bus *video;
1773
1774
1775         if (!device || !device->video)
1776                 return -ENOENT;
1777
1778         video = device->video;
1779
1780         acpi_video_device_remove_fs(device->dev);
1781
1782         status = acpi_remove_notify_handler(device->dev->handle,
1783                                             ACPI_DEVICE_NOTIFY,
1784                                             acpi_video_device_notify);
1785         backlight_device_unregister(device->backlight);
1786         if (device->cdev) {
1787                 sysfs_remove_link(&device->dev->dev.kobj,
1788                                   "thermal_cooling");
1789                 sysfs_remove_link(&device->cdev->device.kobj,
1790                                   "device");
1791                 thermal_cooling_device_unregister(device->cdev);
1792                 device->cdev = NULL;
1793         }
1794         video_output_unregister(device->output_dev);
1795
1796         return 0;
1797 }
1798
1799 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1800 {
1801         int status;
1802         struct acpi_video_device *dev, *next;
1803
1804         mutex_lock(&video->device_list_lock);
1805
1806         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1807
1808                 status = acpi_video_bus_put_one_device(dev);
1809                 if (ACPI_FAILURE(status))
1810                         printk(KERN_WARNING PREFIX
1811                                "hhuuhhuu bug in acpi video driver.\n");
1812
1813                 if (dev->brightness) {
1814                         kfree(dev->brightness->levels);
1815                         kfree(dev->brightness);
1816                 }
1817                 list_del(&dev->entry);
1818                 kfree(dev);
1819         }
1820
1821         mutex_unlock(&video->device_list_lock);
1822
1823         return 0;
1824 }
1825
1826 /* acpi_video interface */
1827
1828 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1829 {
1830         return acpi_video_bus_DOS(video, 0, 0);
1831 }
1832
1833 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1834 {
1835         return acpi_video_bus_DOS(video, 0, 1);
1836 }
1837
1838 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
1839 {
1840         struct acpi_video_bus *video = data;
1841         struct acpi_device *device = NULL;
1842         struct input_dev *input;
1843         int keycode;
1844
1845         if (!video)
1846                 return;
1847
1848         device = video->device;
1849         input = video->input;
1850
1851         switch (event) {
1852         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1853                                          * most likely via hotkey. */
1854                 acpi_bus_generate_proc_event(device, event, 0);
1855                 keycode = KEY_SWITCHVIDEOMODE;
1856                 break;
1857
1858         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1859                                          * connector. */
1860                 acpi_video_device_enumerate(video);
1861                 acpi_video_device_rebind(video);
1862                 acpi_bus_generate_proc_event(device, event, 0);
1863                 keycode = KEY_SWITCHVIDEOMODE;
1864                 break;
1865
1866         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1867                 acpi_bus_generate_proc_event(device, event, 0);
1868                 keycode = KEY_SWITCHVIDEOMODE;
1869                 break;
1870         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1871                 acpi_bus_generate_proc_event(device, event, 0);
1872                 keycode = KEY_VIDEO_NEXT;
1873                 break;
1874         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1875                 acpi_bus_generate_proc_event(device, event, 0);
1876                 keycode = KEY_VIDEO_PREV;
1877                 break;
1878
1879         default:
1880                 keycode = KEY_UNKNOWN;
1881                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1882                                   "Unsupported event [0x%x]\n", event));
1883                 break;
1884         }
1885
1886         acpi_notifier_call_chain(device, event, 0);
1887         input_report_key(input, keycode, 1);
1888         input_sync(input);
1889         input_report_key(input, keycode, 0);
1890         input_sync(input);
1891
1892         return;
1893 }
1894
1895 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1896 {
1897         struct acpi_video_device *video_device = data;
1898         struct acpi_device *device = NULL;
1899         struct acpi_video_bus *bus;
1900         struct input_dev *input;
1901         int keycode;
1902
1903         if (!video_device)
1904                 return;
1905
1906         device = video_device->dev;
1907         bus = video_device->video;
1908         input = bus->input;
1909
1910         switch (event) {
1911         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1912                 if (brightness_switch_enabled)
1913                         acpi_video_switch_brightness(video_device, event);
1914                 acpi_bus_generate_proc_event(device, event, 0);
1915                 keycode = KEY_BRIGHTNESS_CYCLE;
1916                 break;
1917         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1918                 if (brightness_switch_enabled)
1919                         acpi_video_switch_brightness(video_device, event);
1920                 acpi_bus_generate_proc_event(device, event, 0);
1921                 keycode = KEY_BRIGHTNESSUP;
1922                 break;
1923         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1924                 if (brightness_switch_enabled)
1925                         acpi_video_switch_brightness(video_device, event);
1926                 acpi_bus_generate_proc_event(device, event, 0);
1927                 keycode = KEY_BRIGHTNESSDOWN;
1928                 break;
1929         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1930                 if (brightness_switch_enabled)
1931                         acpi_video_switch_brightness(video_device, event);
1932                 acpi_bus_generate_proc_event(device, event, 0);
1933                 keycode = KEY_BRIGHTNESS_ZERO;
1934                 break;
1935         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1936                 if (brightness_switch_enabled)
1937                         acpi_video_switch_brightness(video_device, event);
1938                 acpi_bus_generate_proc_event(device, event, 0);
1939                 keycode = KEY_DISPLAY_OFF;
1940                 break;
1941         default:
1942                 keycode = KEY_UNKNOWN;
1943                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1944                                   "Unsupported event [0x%x]\n", event));
1945                 break;
1946         }
1947
1948         acpi_notifier_call_chain(device, event, 0);
1949         input_report_key(input, keycode, 1);
1950         input_sync(input);
1951         input_report_key(input, keycode, 0);
1952         input_sync(input);
1953
1954         return;
1955 }
1956
1957 static int instance;
1958 static int acpi_video_resume(struct acpi_device *device)
1959 {
1960         struct acpi_video_bus *video;
1961         struct acpi_video_device *video_device;
1962         int i;
1963
1964         if (!device || !acpi_driver_data(device))
1965                 return -EINVAL;
1966
1967         video = acpi_driver_data(device);
1968
1969         for (i = 0; i < video->attached_count; i++) {
1970                 video_device = video->attached_array[i].bind_info;
1971                 if (video_device && video_device->backlight)
1972                         acpi_video_set_brightness(video_device->backlight);
1973         }
1974         return AE_OK;
1975 }
1976
1977 static int acpi_video_bus_add(struct acpi_device *device)
1978 {
1979         acpi_status status;
1980         struct acpi_video_bus *video;
1981         struct input_dev *input;
1982         int error;
1983
1984         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1985         if (!video)
1986                 return -ENOMEM;
1987
1988         /* a hack to fix the duplicate name "VID" problem on T61 */
1989         if (!strcmp(device->pnp.bus_id, "VID")) {
1990                 if (instance)
1991                         device->pnp.bus_id[3] = '0' + instance;
1992                 instance ++;
1993         }
1994
1995         video->device = device;
1996         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1997         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1998         device->driver_data = video;
1999
2000         acpi_video_bus_find_cap(video);
2001         error = acpi_video_bus_check(video);
2002         if (error)
2003                 goto err_free_video;
2004
2005         error = acpi_video_bus_add_fs(device);
2006         if (error)
2007                 goto err_free_video;
2008
2009         mutex_init(&video->device_list_lock);
2010         INIT_LIST_HEAD(&video->video_device_list);
2011
2012         acpi_video_bus_get_devices(video, device);
2013         acpi_video_bus_start_devices(video);
2014
2015         status = acpi_install_notify_handler(device->handle,
2016                                              ACPI_DEVICE_NOTIFY,
2017                                              acpi_video_bus_notify, video);
2018         if (ACPI_FAILURE(status)) {
2019                 printk(KERN_ERR PREFIX
2020                                   "Error installing notify handler\n");
2021                 error = -ENODEV;
2022                 goto err_stop_video;
2023         }
2024
2025         video->input = input = input_allocate_device();
2026         if (!input) {
2027                 error = -ENOMEM;
2028                 goto err_uninstall_notify;
2029         }
2030
2031         snprintf(video->phys, sizeof(video->phys),
2032                 "%s/video/input0", acpi_device_hid(video->device));
2033
2034         input->name = acpi_device_name(video->device);
2035         input->phys = video->phys;
2036         input->id.bustype = BUS_HOST;
2037         input->id.product = 0x06;
2038         input->dev.parent = &device->dev;
2039         input->evbit[0] = BIT(EV_KEY);
2040         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2041         set_bit(KEY_VIDEO_NEXT, input->keybit);
2042         set_bit(KEY_VIDEO_PREV, input->keybit);
2043         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2044         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2045         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2046         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2047         set_bit(KEY_DISPLAY_OFF, input->keybit);
2048         set_bit(KEY_UNKNOWN, input->keybit);
2049
2050         error = input_register_device(input);
2051         if (error)
2052                 goto err_free_input_dev;
2053
2054         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2055                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2056                video->flags.multihead ? "yes" : "no",
2057                video->flags.rom ? "yes" : "no",
2058                video->flags.post ? "yes" : "no");
2059
2060         return 0;
2061
2062  err_free_input_dev:
2063         input_free_device(input);
2064  err_uninstall_notify:
2065         acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
2066                                    acpi_video_bus_notify);
2067  err_stop_video:
2068         acpi_video_bus_stop_devices(video);
2069         acpi_video_bus_put_devices(video);
2070         kfree(video->attached_array);
2071         acpi_video_bus_remove_fs(device);
2072  err_free_video:
2073         kfree(video);
2074         device->driver_data = NULL;
2075
2076         return error;
2077 }
2078
2079 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2080 {
2081         acpi_status status = 0;
2082         struct acpi_video_bus *video = NULL;
2083
2084
2085         if (!device || !acpi_driver_data(device))
2086                 return -EINVAL;
2087
2088         video = acpi_driver_data(device);
2089
2090         acpi_video_bus_stop_devices(video);
2091
2092         status = acpi_remove_notify_handler(video->device->handle,
2093                                             ACPI_DEVICE_NOTIFY,
2094                                             acpi_video_bus_notify);
2095
2096         acpi_video_bus_put_devices(video);
2097         acpi_video_bus_remove_fs(device);
2098
2099         input_unregister_device(video->input);
2100         kfree(video->attached_array);
2101         kfree(video);
2102
2103         return 0;
2104 }
2105
2106 static int __init acpi_video_init(void)
2107 {
2108         int result = 0;
2109
2110         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2111         if (!acpi_video_dir)
2112                 return -ENODEV;
2113         acpi_video_dir->owner = THIS_MODULE;
2114
2115         result = acpi_bus_register_driver(&acpi_video_bus);
2116         if (result < 0) {
2117                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2118                 return -ENODEV;
2119         }
2120
2121         return 0;
2122 }
2123
2124 static void __exit acpi_video_exit(void)
2125 {
2126
2127         acpi_bus_unregister_driver(&acpi_video_bus);
2128
2129         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2130
2131         return;
2132 }
2133
2134 module_init(acpi_video_init);
2135 module_exit(acpi_video_exit);