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 <linux/pci.h>
  41 #include <linux/pci_ids.h>
  42 #include <asm/uaccess.h>
  43
  44 #include <acpi/acpi_bus.h>
  45 #include <acpi/acpi_drivers.h>
  46
  47 #define ACPI_VIDEO_CLASS                "video"
  48 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  49 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  50 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  51 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  52 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  55
  56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  61
  62 #define MAX_NAME_LEN    20
  63
  64 #define ACPI_VIDEO_DISPLAY_CRT  1
  65 #define ACPI_VIDEO_DISPLAY_TV   2
  66 #define ACPI_VIDEO_DISPLAY_DVI  3
  67 #define ACPI_VIDEO_DISPLAY_LCD  4
  68
  69 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  70 ACPI_MODULE_NAME("video");
  71
  72 MODULE_AUTHOR("Bruno Ducrot");
  73 MODULE_DESCRIPTION("ACPI Video Driver");
  74 MODULE_LICENSE("GPL");
  75
  76 static int brightness_switch_enabled = 1;
  77 module_param(brightness_switch_enabled, bool, 0644);
  78
  79 static int acpi_video_bus_add(struct acpi_device *device);
  80 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  81 static int acpi_video_resume(struct acpi_device *device);
  82 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  83
  84 static const struct acpi_device_id video_device_ids[] = {
  85         {ACPI_VIDEO_HID, 0},
  86         {"", 0},
  87 };
  88 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  89
  90 static struct acpi_driver acpi_video_bus = {
  91         .name = "video",
  92         .class = ACPI_VIDEO_CLASS,
  93         .ids = video_device_ids,
  94         .ops = {
  95                 .add = acpi_video_bus_add,
  96                 .remove = acpi_video_bus_remove,
  97                 .resume = acpi_video_resume,
  98                 .notify = acpi_video_bus_notify,
  99                 },
 100 };
 101
 102 struct acpi_video_bus_flags {
 103         u8 multihead:1;         /* can switch video heads */
 104         u8 rom:1;               /* can retrieve a video rom */
 105         u8 post:1;              /* can configure the head to */
 106         u8 reserved:5;
 107 };
 108
 109 struct acpi_video_bus_cap {
 110         u8 _DOS:1;              /*Enable/Disable output switching */
 111         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 112         u8 _ROM:1;              /*Get ROM Data */
 113         u8 _GPD:1;              /*Get POST Device */
 114         u8 _SPD:1;              /*Set POST Device */
 115         u8 _VPO:1;              /*Video POST Options */
 116         u8 reserved:2;
 117 };
 118
 119 struct acpi_video_device_attrib {
 120         u32 display_index:4;    /* A zero-based instance of the Display */
 121         u32 display_port_attachment:4;  /*This field differentiates the display type */
 122         u32 display_type:4;     /*Describe the specific type in use */
 123         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 124         u32 bios_can_detect:1;  /*BIOS can detect the device */
 125         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 126                                    the VGA device. */
 127         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 128         u32 reserved:10;        /*Must be 0 */
 129         u32 device_id_scheme:1; /*Device ID Scheme */
 130 };
 131
 132 struct acpi_video_enumerated_device {
 133         union {
 134                 u32 int_val;
 135                 struct acpi_video_device_attrib attrib;
 136         } value;
 137         struct acpi_video_device *bind_info;
 138 };
 139
 140 struct acpi_video_bus {
 141         struct acpi_device *device;
 142         u8 dos_setting;
 143         struct acpi_video_enumerated_device *attached_array;
 144         u8 attached_count;
 145         struct acpi_video_bus_cap cap;
 146         struct acpi_video_bus_flags flags;
 147         struct list_head video_device_list;
 148         struct mutex device_list_lock;  /* protects video_device_list */
 149         struct proc_dir_entry *dir;
 150         struct input_dev *input;
 151         char phys[32];  /* for input device */
 152 };
 153
 154 struct acpi_video_device_flags {
 155         u8 crt:1;
 156         u8 lcd:1;
 157         u8 tvout:1;
 158         u8 dvi:1;
 159         u8 bios:1;
 160         u8 unknown:1;
 161         u8 reserved:2;
 162 };
 163
 164 struct acpi_video_device_cap {
 165         u8 _ADR:1;              /*Return the unique ID */
 166         u8 _BCL:1;              /*Query list of brightness control levels supported */
 167         u8 _BCM:1;              /*Set the brightness level */
 168         u8 _BQC:1;              /* Get current brightness level */
 169         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 170         u8 _DDC:1;              /*Return the EDID for this device */
 171         u8 _DCS:1;              /*Return status of output device */
 172         u8 _DGS:1;              /*Query graphics state */
 173         u8 _DSS:1;              /*Device state set */
 174 };
 175
 176 struct acpi_video_brightness_flags {
 177         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 178         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
 179         u8 _BCL_use_index:1;            /* levels in _BCL are index values */
 180         u8 _BCM_use_index:1;            /* input of _BCM is an index value */
 181         u8 _BQC_use_index:1;            /* _BQC returns an index value */
 182 };
 183
 184 struct acpi_video_device_brightness {
 185         int curr;
 186         int count;
 187         int *levels;
 188         struct acpi_video_brightness_flags flags;
 189 };
 190
 191 struct acpi_video_device {
 192         unsigned long device_id;
 193         struct acpi_video_device_flags flags;
 194         struct acpi_video_device_cap cap;
 195         struct list_head entry;
 196         struct acpi_video_bus *video;
 197         struct acpi_device *dev;
 198         struct acpi_video_device_brightness *brightness;
 199         struct backlight_device *backlight;
 200         struct thermal_cooling_device *cdev;
 201         struct output_device *output_dev;
 202 };
 203
 204 /* bus */
 205 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 206 static const struct file_operations acpi_video_bus_info_fops = {
 207         .owner = THIS_MODULE,
 208         .open = acpi_video_bus_info_open_fs,
 209         .read = seq_read,
 210         .llseek = seq_lseek,
 211         .release = single_release,
 212 };
 213
 214 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 215 static const struct file_operations acpi_video_bus_ROM_fops = {
 216         .owner = THIS_MODULE,
 217         .open = acpi_video_bus_ROM_open_fs,
 218         .read = seq_read,
 219         .llseek = seq_lseek,
 220         .release = single_release,
 221 };
 222
 223 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 224                                             struct file *file);
 225 static const struct file_operations acpi_video_bus_POST_info_fops = {
 226         .owner = THIS_MODULE,
 227         .open = acpi_video_bus_POST_info_open_fs,
 228         .read = seq_read,
 229         .llseek = seq_lseek,
 230         .release = single_release,
 231 };
 232
 233 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 234 static ssize_t acpi_video_bus_write_POST(struct file *file,
 235         const char __user *buffer, size_t count, loff_t *data);
 236 static const struct file_operations acpi_video_bus_POST_fops = {
 237         .owner = THIS_MODULE,
 238         .open = acpi_video_bus_POST_open_fs,
 239         .read = seq_read,
 240         .write = acpi_video_bus_write_POST,
 241         .llseek = seq_lseek,
 242         .release = single_release,
 243 };
 244
 245 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 246 static ssize_t acpi_video_bus_write_DOS(struct file *file,
 247         const char __user *buffer, size_t count, loff_t *data);
 248 static const struct file_operations acpi_video_bus_DOS_fops = {
 249         .owner = THIS_MODULE,
 250         .open = acpi_video_bus_DOS_open_fs,
 251         .read = seq_read,
 252         .write = acpi_video_bus_write_DOS,
 253         .llseek = seq_lseek,
 254         .release = single_release,
 255 };
 256
 257 /* device */
 258 static int acpi_video_device_info_open_fs(struct inode *inode,
 259                                           struct file *file);
 260 static const struct file_operations acpi_video_device_info_fops = {
 261         .owner = THIS_MODULE,
 262         .open = acpi_video_device_info_open_fs,
 263         .read = seq_read,
 264         .llseek = seq_lseek,
 265         .release = single_release,
 266 };
 267
 268 static int acpi_video_device_state_open_fs(struct inode *inode,
 269                                            struct file *file);
 270 static ssize_t acpi_video_device_write_state(struct file *file,
 271         const char __user *buffer, size_t count, loff_t *data);
 272 static const struct file_operations acpi_video_device_state_fops = {
 273         .owner = THIS_MODULE,
 274         .open = acpi_video_device_state_open_fs,
 275         .read = seq_read,
 276         .write = acpi_video_device_write_state,
 277         .llseek = seq_lseek,
 278         .release = single_release,
 279 };
 280
 281 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 282                                                 struct file *file);
 283 static ssize_t acpi_video_device_write_brightness(struct file *file,
 284         const char __user *buffer, size_t count, loff_t *data);
 285 static struct file_operations acpi_video_device_brightness_fops = {
 286         .owner = THIS_MODULE,
 287         .open = acpi_video_device_brightness_open_fs,
 288         .read = seq_read,
 289         .write = acpi_video_device_write_brightness,
 290         .llseek = seq_lseek,
 291         .release = single_release,
 292 };
 293
 294 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 295                                           struct file *file);
 296 static const struct file_operations acpi_video_device_EDID_fops = {
 297         .owner = THIS_MODULE,
 298         .open = acpi_video_device_EDID_open_fs,
 299         .read = seq_read,
 300         .llseek = seq_lseek,
 301         .release = single_release,
 302 };
 303
 304 static const char device_decode[][30] = {
 305         "motherboard VGA device",
 306         "PCI VGA device",
 307         "AGP VGA device",
 308         "UNKNOWN",
 309 };
 310
 311 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 312 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 313 static void acpi_video_device_bind(struct acpi_video_bus *video,
 314                                    struct acpi_video_device *device);
 315 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 316 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 317                         int level);
 318 static int acpi_video_device_lcd_get_level_current(
 319                         struct acpi_video_device *device,
 320                         unsigned long long *level);
 321 static int acpi_video_get_next_level(struct acpi_video_device *device,
 322                                      u32 level_current, u32 event);
 323 static int acpi_video_switch_brightness(struct acpi_video_device *device,
 324                                          int event);
 325 static int acpi_video_device_get_state(struct acpi_video_device *device,
 326                             unsigned long long *state);
 327 static int acpi_video_output_get(struct output_device *od);
 328 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 329
 330 /*backlight device sysfs support*/
 331 static int acpi_video_get_brightness(struct backlight_device *bd)
 332 {
 333         unsigned long long cur_level;
 334         int i;
 335         struct acpi_video_device *vd =
 336                 (struct acpi_video_device *)bl_get_data(bd);
 337
 338         if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
 339                 return -EINVAL;
 340         for (i = 2; i < vd->brightness->count; i++) {
 341                 if (vd->brightness->levels[i] == cur_level)
 342                         /* The first two entries are special - see page 575
 343                            of the ACPI spec 3.0 */
 344                         return i-2;
 345         }
 346         return 0;
 347 }
 348
 349 static int acpi_video_set_brightness(struct backlight_device *bd)
 350 {
 351         int request_level = bd->props.brightness + 2;
 352         struct acpi_video_device *vd =
 353                 (struct acpi_video_device *)bl_get_data(bd);
 354
 355         return acpi_video_device_lcd_set_level(vd,
 356                                 vd->brightness->levels[request_level]);
 357 }
 358
 359 static struct backlight_ops acpi_backlight_ops = {
 360         .get_brightness = acpi_video_get_brightness,
 361         .update_status  = acpi_video_set_brightness,
 362 };
 363
 364 /*video output device sysfs support*/
 365 static int acpi_video_output_get(struct output_device *od)
 366 {
 367         unsigned long long state;
 368         struct acpi_video_device *vd =
 369                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 370         acpi_video_device_get_state(vd, &state);
 371         return (int)state;
 372 }
 373
 374 static int acpi_video_output_set(struct output_device *od)
 375 {
 376         unsigned long state = od->request_state;
 377         struct acpi_video_device *vd=
 378                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 379         return acpi_video_device_set_state(vd, state);
 380 }
 381
 382 static struct output_properties acpi_output_properties = {
 383         .set_state = acpi_video_output_set,
 384         .get_status = acpi_video_output_get,
 385 };
 386
 387
 388 /* thermal cooling device callbacks */
 389 static int video_get_max_state(struct thermal_cooling_device *cdev, unsigned
 390                                long *state)
 391 {
 392         struct acpi_device *device = cdev->devdata;
 393         struct acpi_video_device *video = acpi_driver_data(device);
 394
 395         *state = video->brightness->count - 3;
 396         return 0;
 397 }
 398
 399 static int video_get_cur_state(struct thermal_cooling_device *cdev, unsigned
 400                                long *state)
 401 {
 402         struct acpi_device *device = cdev->devdata;
 403         struct acpi_video_device *video = acpi_driver_data(device);
 404         unsigned long long level;
 405         int offset;
 406
 407         if (acpi_video_device_lcd_get_level_current(video, &level))
 408                 return -EINVAL;
 409         for (offset = 2; offset < video->brightness->count; offset++)
 410                 if (level == video->brightness->levels[offset]) {
 411                         *state = video->brightness->count - offset - 1;
 412                         return 0;
 413                 }
 414
 415         return -EINVAL;
 416 }
 417
 418 static int
 419 video_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
 420 {
 421         struct acpi_device *device = cdev->devdata;
 422         struct acpi_video_device *video = acpi_driver_data(device);
 423         int level;
 424
 425         if ( state >= video->brightness->count - 2)
 426                 return -EINVAL;
 427
 428         state = video->brightness->count - state;
 429         level = video->brightness->levels[state -1];
 430         return acpi_video_device_lcd_set_level(video, level);
 431 }
 432
 433 static struct thermal_cooling_device_ops video_cooling_ops = {
 434         .get_max_state = video_get_max_state,
 435         .get_cur_state = video_get_cur_state,
 436         .set_cur_state = video_set_cur_state,
 437 };
 438
 439 /* --------------------------------------------------------------------------
 440                                Video Management
 441    -------------------------------------------------------------------------- */
 442
 443 /* device */
 444
 445 static int
 446 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
 447 {
 448         int status;
 449
 450         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 451
 452         return status;
 453 }
 454
 455 static int
 456 acpi_video_device_get_state(struct acpi_video_device *device,
 457                             unsigned long long *state)
 458 {
 459         int status;
 460
 461         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 462
 463         return status;
 464 }
 465
 466 static int
 467 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 468 {
 469         int status;
 470         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 471         struct acpi_object_list args = { 1, &arg0 };
 472         unsigned long long ret;
 473
 474
 475         arg0.integer.value = state;
 476         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 477
 478         return status;
 479 }
 480
 481 static int
 482 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 483                                    union acpi_object **levels)
 484 {
 485         int status;
 486         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 487         union acpi_object *obj;
 488
 489
 490         *levels = NULL;
 491
 492         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 493         if (!ACPI_SUCCESS(status))
 494                 return status;
 495         obj = (union acpi_object *)buffer.pointer;
 496         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 497                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 498                 status = -EFAULT;
 499                 goto err;
 500         }
 501
 502         *levels = obj;
 503
 504         return 0;
 505
 506       err:
 507         kfree(buffer.pointer);
 508
 509         return status;
 510 }
 511
 512 static int
 513 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 514 {
 515         int status;
 516         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 517         struct acpi_object_list args = { 1, &arg0 };
 518         int state;
 519
 520         arg0.integer.value = level;
 521
 522         status = acpi_evaluate_object(device->dev->handle, "_BCM",
 523                                       &args, NULL);
 524         if (ACPI_FAILURE(status)) {
 525                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 526                 return -EIO;
 527         }
 528
 529         device->brightness->curr = level;
 530         for (state = 2; state < device->brightness->count; state++)
 531                 if (level == device->brightness->levels[state]) {
 532                         if (device->backlight)
 533                                 device->backlight->props.brightness = state - 2;
 534                         return 0;
 535                 }
 536
 537         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 538         return -EINVAL;
 539 }
 540
 541 static int
 542 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 543                                         unsigned long long *level)
 544 {
 545         acpi_status status = AE_OK;
 546
 547         if (device->cap._BQC || device->cap._BCQ) {
 548                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 549
 550                 status = acpi_evaluate_integer(device->dev->handle, buf,
 551                                                 NULL, level);
 552                 if (ACPI_SUCCESS(status)) {
 553                         if (device->brightness->flags._BQC_use_index) {
 554                                 if (device->brightness->flags._BCL_reversed)
 555                                         *level = device->brightness->count
 556                                                                  - 3 - (*level);
 557                                 *level = device->brightness->levels[*level + 2];
 558
 559                         }
 560                         device->brightness->curr = *level;
 561                         return 0;
 562                 } else {
 563                         /* Fixme:
 564                          * should we return an error or ignore this failure?
 565                          * dev->brightness->curr is a cached value which stores
 566                          * the correct current backlight level in most cases.
 567                          * ACPI video backlight still works w/ buggy _BQC.
 568                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 569                          */
 570                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 571                         device->cap._BQC = device->cap._BCQ = 0;
 572                 }
 573         }
 574
 575         *level = device->brightness->curr;
 576         return 0;
 577 }
 578
 579 static int
 580 acpi_video_device_EDID(struct acpi_video_device *device,
 581                        union acpi_object **edid, ssize_t length)
 582 {
 583         int status;
 584         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 585         union acpi_object *obj;
 586         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 587         struct acpi_object_list args = { 1, &arg0 };
 588
 589
 590         *edid = NULL;
 591
 592         if (!device)
 593                 return -ENODEV;
 594         if (length == 128)
 595                 arg0.integer.value = 1;
 596         else if (length == 256)
 597                 arg0.integer.value = 2;
 598         else
 599                 return -EINVAL;
 600
 601         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 602         if (ACPI_FAILURE(status))
 603                 return -ENODEV;
 604
 605         obj = buffer.pointer;
 606
 607         if (obj && obj->type == ACPI_TYPE_BUFFER)
 608                 *edid = obj;
 609         else {
 610                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 611                 status = -EFAULT;
 612                 kfree(obj);
 613         }
 614
 615         return status;
 616 }
 617
 618 /* bus */
 619
 620 static int
 621 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 622 {
 623         int status;
 624         unsigned long long tmp;
 625         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 626         struct acpi_object_list args = { 1, &arg0 };
 627
 628
 629         arg0.integer.value = option;
 630
 631         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 632         if (ACPI_SUCCESS(status))
 633                 status = tmp ? (-EINVAL) : (AE_OK);
 634
 635         return status;
 636 }
 637
 638 static int
 639 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
 640 {
 641         int status;
 642
 643         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 644
 645         return status;
 646 }
 647
 648 static int
 649 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 650                             unsigned long long *options)
 651 {
 652         int status;
 653
 654         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 655         *options &= 3;
 656
 657         return status;
 658 }
 659
 660 /*
 661  *  Arg:
 662  *      video           : video bus device pointer
 663  *      bios_flag       :
 664  *              0.      The system BIOS should NOT automatically switch(toggle)
 665  *                      the active display output.
 666  *              1.      The system BIOS should automatically switch (toggle) the
 667  *                      active display output. No switch event.
 668  *              2.      The _DGS value should be locked.
 669  *              3.      The system BIOS should not automatically switch (toggle) the
 670  *                      active display output, but instead generate the display switch
 671  *                      event notify code.
 672  *      lcd_flag        :
 673  *              0.      The system BIOS should automatically control the brightness level
 674  *                      of the LCD when the power changes from AC to DC
 675  *              1.      The system BIOS should NOT automatically control the brightness
 676  *                      level of the LCD when the power changes from AC to DC.
 677  * Return Value:
 678  *              -1      wrong arg.
 679  */
 680
 681 static int
 682 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 683 {
 684         acpi_integer status = 0;
 685         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 686         struct acpi_object_list args = { 1, &arg0 };
 687
 688
 689         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 690                 status = -1;
 691                 goto Failed;
 692         }
 693         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 694         video->dos_setting = arg0.integer.value;
 695         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 696
 697       Failed:
 698         return status;
 699 }
 700
 701 /*
 702  * Simple comparison function used to sort backlight levels.
 703  */
 704
 705 static int
 706 acpi_video_cmp_level(const void *a, const void *b)
 707 {
 708         return *(int *)a - *(int *)b;
 709 }
 710
 711 /*
 712  *  Arg:
 713  *      device  : video output device (LCD, CRT, ..)
 714  *
 715  *  Return Value:
 716  *      Maximum brightness level
 717  *
 718  *  Allocate and initialize device->brightness.
 719  */
 720
 721 static int
 722 acpi_video_init_brightness(struct acpi_video_device *device)
 723 {
 724         union acpi_object *obj = NULL;
 725         int i, max_level = 0, count = 0, level_ac_battery = 0;
 726         unsigned long long level, level_old;
 727         union acpi_object *o;
 728         struct acpi_video_device_brightness *br = NULL;
 729         int result = -EINVAL;
 730
 731         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 732                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 733                                                 "LCD brightness level\n"));
 734                 goto out;
 735         }
 736
 737         if (obj->package.count < 2)
 738                 goto out;
 739
 740         br = kzalloc(sizeof(*br), GFP_KERNEL);
 741         if (!br) {
 742                 printk(KERN_ERR "can't allocate memory\n");
 743                 result = -ENOMEM;
 744                 goto out;
 745         }
 746
 747         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 748                                 GFP_KERNEL);
 749         if (!br->levels) {
 750                 result = -ENOMEM;
 751                 goto out_free;
 752         }
 753
 754         for (i = 0; i < obj->package.count; i++) {
 755                 o = (union acpi_object *)&obj->package.elements[i];
 756                 if (o->type != ACPI_TYPE_INTEGER) {
 757                         printk(KERN_ERR PREFIX "Invalid data\n");
 758                         continue;
 759                 }
 760                 br->levels[count] = (u32) o->integer.value;
 761
 762                 if (br->levels[count] > max_level)
 763                         max_level = br->levels[count];
 764                 count++;
 765         }
 766
 767         /*
 768          * some buggy BIOS don't export the levels
 769          * when machine is on AC/Battery in _BCL package.
 770          * In this case, the first two elements in _BCL packages
 771          * are also supported brightness levels that OS should take care of.
 772          */
 773         for (i = 2; i < count; i++) {
 774                 if (br->levels[i] == br->levels[0])
 775                         level_ac_battery++;
 776                 if (br->levels[i] == br->levels[1])
 777                         level_ac_battery++;
 778         }
 779
 780         if (level_ac_battery < 2) {
 781                 level_ac_battery = 2 - level_ac_battery;
 782                 br->flags._BCL_no_ac_battery_levels = 1;
 783                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 784                         br->levels[i] = br->levels[i - level_ac_battery];
 785                 count += level_ac_battery;
 786         } else if (level_ac_battery > 2)
 787                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 788
 789         /* Check if the _BCL package is in a reversed order */
 790         if (max_level == br->levels[2]) {
 791                 br->flags._BCL_reversed = 1;
 792                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 793                         acpi_video_cmp_level, NULL);
 794         } else if (max_level != br->levels[count - 1])
 795                 ACPI_ERROR((AE_INFO,
 796                             "Found unordered _BCL package\n"));
 797
 798         br->count = count;
 799         device->brightness = br;
 800
 801         /* Check the input/output of _BQC/_BCL/_BCM */
 802         if ((max_level < 100) && (max_level <= (count - 2)))
 803                 br->flags._BCL_use_index = 1;
 804
 805         /*
 806          * _BCM is always consistent with _BCL,
 807          * at least for all the laptops we have ever seen.
 808          */
 809         br->flags._BCM_use_index = br->flags._BCL_use_index;
 810
 811         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 812         br->curr = level_old = max_level;
 813
 814         if (!device->cap._BQC)
 815                 goto set_level;
 816
 817         result = acpi_video_device_lcd_get_level_current(device, &level_old);
 818         if (result)
 819                 goto out_free_levels;
 820
 821         /*
 822          * Set the level to maximum and check if _BQC uses indexed value
 823          */
 824         result = acpi_video_device_lcd_set_level(device, max_level);
 825         if (result)
 826                 goto out_free_levels;
 827
 828         result = acpi_video_device_lcd_get_level_current(device, &level);
 829         if (result)
 830                 goto out_free_levels;
 831
 832         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 833
 834         if (!br->flags._BQC_use_index)
 835                 goto set_level;
 836
 837         if (br->flags._BCL_reversed)
 838                 level_old = (br->count - 1) - level_old;
 839         level_old = br->levels[level_old];
 840
 841 set_level:
 842         result = acpi_video_device_lcd_set_level(device, level_old);
 843         if (result)
 844                 goto out_free_levels;
 845
 846         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 847                           "found %d brightness levels\n", count - 2));
 848         kfree(obj);
 849         return result;
 850
 851 out_free_levels:
 852         kfree(br->levels);
 853 out_free:
 854         kfree(br);
 855 out:
 856         device->brightness = NULL;
 857         kfree(obj);
 858         return result;
 859 }
 860
 861 /*
 862  *  Arg:
 863  *      device  : video output device (LCD, CRT, ..)
 864  *
 865  *  Return Value:
 866  *      None
 867  *
 868  *  Find out all required AML methods defined under the output
 869  *  device.
 870  */
 871
 872 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 873 {
 874         acpi_handle h_dummy1;
 875
 876
 877         memset(&device->cap, 0, sizeof(device->cap));
 878
 879         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 880                 device->cap._ADR = 1;
 881         }
 882         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 883                 device->cap._BCL = 1;
 884         }
 885         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 886                 device->cap._BCM = 1;
 887         }
 888         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 889                 device->cap._BQC = 1;
 890         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 891                                 &h_dummy1))) {
 892                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 893                 device->cap._BCQ = 1;
 894         }
 895
 896         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 897                 device->cap._DDC = 1;
 898         }
 899         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 900                 device->cap._DCS = 1;
 901         }
 902         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 903                 device->cap._DGS = 1;
 904         }
 905         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 906                 device->cap._DSS = 1;
 907         }
 908
 909         if (acpi_video_backlight_support()) {
 910                 int result;
 911                 static int count = 0;
 912                 char *name;
 913
 914                 result = acpi_video_init_brightness(device);
 915                 if (result)
 916                         return;
 917                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 918                 if (!name)
 919                         return;
 920
 921                 sprintf(name, "acpi_video%d", count++);
 922                 device->backlight = backlight_device_register(name,
 923                         NULL, device, &acpi_backlight_ops);
 924                 device->backlight->props.max_brightness = device->brightness->count-3;
 925                 kfree(name);
 926
 927                 device->cdev = thermal_cooling_device_register("LCD",
 928                                         device->dev, &video_cooling_ops);
 929                 if (IS_ERR(device->cdev))
 930                         return;
 931
 932                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 933                          device->cdev->id);
 934                 result = sysfs_create_link(&device->dev->dev.kobj,
 935                                 &device->cdev->device.kobj,
 936                                 "thermal_cooling");
 937                 if (result)
 938                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 939                 result = sysfs_create_link(&device->cdev->device.kobj,
 940                                 &device->dev->dev.kobj, "device");
 941                 if (result)
 942                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 943
 944         }
 945
 946         if (acpi_video_display_switch_support()) {
 947
 948                 if (device->cap._DCS && device->cap._DSS) {
 949                         static int count;
 950                         char *name;
 951                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 952                         if (!name)
 953                                 return;
 954                         sprintf(name, "acpi_video%d", count++);
 955                         device->output_dev = video_output_register(name,
 956                                         NULL, device, &acpi_output_properties);
 957                         kfree(name);
 958                 }
 959         }
 960 }
 961
 962 /*
 963  *  Arg:
 964  *      device  : video output device (VGA)
 965  *
 966  *  Return Value:
 967  *      None
 968  *
 969  *  Find out all required AML methods defined under the video bus device.
 970  */
 971
 972 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 973 {
 974         acpi_handle h_dummy1;
 975
 976         memset(&video->cap, 0, sizeof(video->cap));
 977         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 978                 video->cap._DOS = 1;
 979         }
 980         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 981                 video->cap._DOD = 1;
 982         }
 983         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 984                 video->cap._ROM = 1;
 985         }
 986         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 987                 video->cap._GPD = 1;
 988         }
 989         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 990                 video->cap._SPD = 1;
 991         }
 992         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 993                 video->cap._VPO = 1;
 994         }
 995 }
 996
 997 /*
 998  * Check whether the video bus device has required AML method to
 999  * support the desired features
1000  */
1001
1002 static int acpi_video_bus_check(struct acpi_video_bus *video)
1003 {
1004         acpi_status status = -ENOENT;
1005         struct device *dev;
1006
1007         if (!video)
1008                 return -EINVAL;
1009
1010         dev = acpi_get_physical_pci_device(video->device->handle);
1011         if (!dev)
1012                 return -ENODEV;
1013         put_device(dev);
1014
1015         /* Since there is no HID, CID and so on for VGA driver, we have
1016          * to check well known required nodes.
1017          */
1018
1019         /* Does this device support video switching? */
1020         if (video->cap._DOS) {
1021                 video->flags.multihead = 1;
1022                 status = 0;
1023         }
1024
1025         /* Does this device support retrieving a video ROM? */
1026         if (video->cap._ROM) {
1027                 video->flags.rom = 1;
1028                 status = 0;
1029         }
1030
1031         /* Does this device support configuring which video device to POST? */
1032         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1033                 video->flags.post = 1;
1034                 status = 0;
1035         }
1036
1037         return status;
1038 }
1039
1040 /* --------------------------------------------------------------------------
1041                               FS Interface (/proc)
1042    -------------------------------------------------------------------------- */
1043
1044 static struct proc_dir_entry *acpi_video_dir;
1045
1046 /* video devices */
1047
1048 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1049 {
1050         struct acpi_video_device *dev = seq->private;
1051
1052
1053         if (!dev)
1054                 goto end;
1055
1056         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
1057         seq_printf(seq, "type:         ");
1058         if (dev->flags.crt)
1059                 seq_printf(seq, "CRT\n");
1060         else if (dev->flags.lcd)
1061                 seq_printf(seq, "LCD\n");
1062         else if (dev->flags.tvout)
1063                 seq_printf(seq, "TVOUT\n");
1064         else if (dev->flags.dvi)
1065                 seq_printf(seq, "DVI\n");
1066         else
1067                 seq_printf(seq, "UNKNOWN\n");
1068
1069         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1070
1071       end:
1072         return 0;
1073 }
1074
1075 static int
1076 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1077 {
1078         return single_open(file, acpi_video_device_info_seq_show,
1079                            PDE(inode)->data);
1080 }
1081
1082 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1083 {
1084         int status;
1085         struct acpi_video_device *dev = seq->private;
1086         unsigned long long state;
1087
1088
1089         if (!dev)
1090                 goto end;
1091
1092         status = acpi_video_device_get_state(dev, &state);
1093         seq_printf(seq, "state:     ");
1094         if (ACPI_SUCCESS(status))
1095                 seq_printf(seq, "0x%02llx\n", state);
1096         else
1097                 seq_printf(seq, "<not supported>\n");
1098
1099         status = acpi_video_device_query(dev, &state);
1100         seq_printf(seq, "query:     ");
1101         if (ACPI_SUCCESS(status))
1102                 seq_printf(seq, "0x%02llx\n", state);
1103         else
1104                 seq_printf(seq, "<not supported>\n");
1105
1106       end:
1107         return 0;
1108 }
1109
1110 static int
1111 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1112 {
1113         return single_open(file, acpi_video_device_state_seq_show,
1114                            PDE(inode)->data);
1115 }
1116
1117 static ssize_t
1118 acpi_video_device_write_state(struct file *file,
1119                               const char __user * buffer,
1120                               size_t count, loff_t * data)
1121 {
1122         int status;
1123         struct seq_file *m = file->private_data;
1124         struct acpi_video_device *dev = m->private;
1125         char str[12] = { 0 };
1126         u32 state = 0;
1127
1128
1129         if (!dev || count + 1 > sizeof str)
1130                 return -EINVAL;
1131
1132         if (copy_from_user(str, buffer, count))
1133                 return -EFAULT;
1134
1135         str[count] = 0;
1136         state = simple_strtoul(str, NULL, 0);
1137         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1138
1139         status = acpi_video_device_set_state(dev, state);
1140
1141         if (status)
1142                 return -EFAULT;
1143
1144         return count;
1145 }
1146
1147 static int
1148 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1149 {
1150         struct acpi_video_device *dev = seq->private;
1151         int i;
1152
1153
1154         if (!dev || !dev->brightness) {
1155                 seq_printf(seq, "<not supported>\n");
1156                 return 0;
1157         }
1158
1159         seq_printf(seq, "levels: ");
1160         for (i = 2; i < dev->brightness->count; i++)
1161                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1162         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1163
1164         return 0;
1165 }
1166
1167 static int
1168 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1169 {
1170         return single_open(file, acpi_video_device_brightness_seq_show,
1171                            PDE(inode)->data);
1172 }
1173
1174 static ssize_t
1175 acpi_video_device_write_brightness(struct file *file,
1176                                    const char __user * buffer,
1177                                    size_t count, loff_t * data)
1178 {
1179         struct seq_file *m = file->private_data;
1180         struct acpi_video_device *dev = m->private;
1181         char str[5] = { 0 };
1182         unsigned int level = 0;
1183         int i;
1184
1185
1186         if (!dev || !dev->brightness || count + 1 > sizeof str)
1187                 return -EINVAL;
1188
1189         if (copy_from_user(str, buffer, count))
1190                 return -EFAULT;
1191
1192         str[count] = 0;
1193         level = simple_strtoul(str, NULL, 0);
1194
1195         if (level > 100)
1196                 return -EFAULT;
1197
1198         /* validate through the list of available levels */
1199         for (i = 2; i < dev->brightness->count; i++)
1200                 if (level == dev->brightness->levels[i]) {
1201                         if (!acpi_video_device_lcd_set_level(dev, level))
1202                                 return count;
1203                         break;
1204                 }
1205
1206         return -EINVAL;
1207 }
1208
1209 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1210 {
1211         struct acpi_video_device *dev = seq->private;
1212         int status;
1213         int i;
1214         union acpi_object *edid = NULL;
1215
1216
1217         if (!dev)
1218                 goto out;
1219
1220         status = acpi_video_device_EDID(dev, &edid, 128);
1221         if (ACPI_FAILURE(status)) {
1222                 status = acpi_video_device_EDID(dev, &edid, 256);
1223         }
1224
1225         if (ACPI_FAILURE(status)) {
1226                 goto out;
1227         }
1228
1229         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1230                 for (i = 0; i < edid->buffer.length; i++)
1231                         seq_putc(seq, edid->buffer.pointer[i]);
1232         }
1233
1234       out:
1235         if (!edid)
1236                 seq_printf(seq, "<not supported>\n");
1237         else
1238                 kfree(edid);
1239
1240         return 0;
1241 }
1242
1243 static int
1244 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1245 {
1246         return single_open(file, acpi_video_device_EDID_seq_show,
1247                            PDE(inode)->data);
1248 }
1249
1250 static int acpi_video_device_add_fs(struct acpi_device *device)
1251 {
1252         struct proc_dir_entry *entry, *device_dir;
1253         struct acpi_video_device *vid_dev;
1254
1255         vid_dev = acpi_driver_data(device);
1256         if (!vid_dev)
1257                 return -ENODEV;
1258
1259         device_dir = proc_mkdir(acpi_device_bid(device),
1260                                 vid_dev->video->dir);
1261         if (!device_dir)
1262                 return -ENOMEM;
1263
1264         /* 'info' [R] */
1265         entry = proc_create_data("info", S_IRUGO, device_dir,
1266                         &acpi_video_device_info_fops, acpi_driver_data(device));
1267         if (!entry)
1268                 goto err_remove_dir;
1269
1270         /* 'state' [R/W] */
1271         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1272                                  device_dir,
1273                                  &acpi_video_device_state_fops,
1274                                  acpi_driver_data(device));
1275         if (!entry)
1276                 goto err_remove_info;
1277
1278         /* 'brightness' [R/W] */
1279         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1280                                  device_dir,
1281                                  &acpi_video_device_brightness_fops,
1282                                  acpi_driver_data(device));
1283         if (!entry)
1284                 goto err_remove_state;
1285
1286         /* 'EDID' [R] */
1287         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1288                                  &acpi_video_device_EDID_fops,
1289                                  acpi_driver_data(device));
1290         if (!entry)
1291                 goto err_remove_brightness;
1292
1293         acpi_device_dir(device) = device_dir;
1294
1295         return 0;
1296
1297  err_remove_brightness:
1298         remove_proc_entry("brightness", device_dir);
1299  err_remove_state:
1300         remove_proc_entry("state", device_dir);
1301  err_remove_info:
1302         remove_proc_entry("info", device_dir);
1303  err_remove_dir:
1304         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1305         return -ENOMEM;
1306 }
1307
1308 static int acpi_video_device_remove_fs(struct acpi_device *device)
1309 {
1310         struct acpi_video_device *vid_dev;
1311         struct proc_dir_entry *device_dir;
1312
1313         vid_dev = acpi_driver_data(device);
1314         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1315                 return -ENODEV;
1316
1317         device_dir = acpi_device_dir(device);
1318         if (device_dir) {
1319                 remove_proc_entry("info", device_dir);
1320                 remove_proc_entry("state", device_dir);
1321                 remove_proc_entry("brightness", device_dir);
1322                 remove_proc_entry("EDID", device_dir);
1323                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1324                 acpi_device_dir(device) = NULL;
1325         }
1326
1327         return 0;
1328 }
1329
1330 /* video bus */
1331 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1332 {
1333         struct acpi_video_bus *video = seq->private;
1334
1335
1336         if (!video)
1337                 goto end;
1338
1339         seq_printf(seq, "Switching heads:              %s\n",
1340                    video->flags.multihead ? "yes" : "no");
1341         seq_printf(seq, "Video ROM:                    %s\n",
1342                    video->flags.rom ? "yes" : "no");
1343         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1344                    video->flags.post ? "yes" : "no");
1345
1346       end:
1347         return 0;
1348 }
1349
1350 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1351 {
1352         return single_open(file, acpi_video_bus_info_seq_show,
1353                            PDE(inode)->data);
1354 }
1355
1356 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1357 {
1358         struct acpi_video_bus *video = seq->private;
1359
1360
1361         if (!video)
1362                 goto end;
1363
1364         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1365         seq_printf(seq, "<TODO>\n");
1366
1367       end:
1368         return 0;
1369 }
1370
1371 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1372 {
1373         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1374 }
1375
1376 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1377 {
1378         struct acpi_video_bus *video = seq->private;
1379         unsigned long long options;
1380         int status;
1381
1382
1383         if (!video)
1384                 goto end;
1385
1386         status = acpi_video_bus_POST_options(video, &options);
1387         if (ACPI_SUCCESS(status)) {
1388                 if (!(options & 1)) {
1389                         printk(KERN_WARNING PREFIX
1390                                "The motherboard VGA device is not listed as a possible POST device.\n");
1391                         printk(KERN_WARNING PREFIX
1392                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1393                 }
1394                 printk(KERN_WARNING "%llx\n", options);
1395                 seq_printf(seq, "can POST: <integrated video>");
1396                 if (options & 2)
1397                         seq_printf(seq, " <PCI video>");
1398                 if (options & 4)
1399                         seq_printf(seq, " <AGP video>");
1400                 seq_putc(seq, '\n');
1401         } else
1402                 seq_printf(seq, "<not supported>\n");
1403       end:
1404         return 0;
1405 }
1406
1407 static int
1408 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1409 {
1410         return single_open(file, acpi_video_bus_POST_info_seq_show,
1411                            PDE(inode)->data);
1412 }
1413
1414 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1415 {
1416         struct acpi_video_bus *video = seq->private;
1417         int status;
1418         unsigned long long id;
1419
1420
1421         if (!video)
1422                 goto end;
1423
1424         status = acpi_video_bus_get_POST(video, &id);
1425         if (!ACPI_SUCCESS(status)) {
1426                 seq_printf(seq, "<not supported>\n");
1427                 goto end;
1428         }
1429         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1430
1431       end:
1432         return 0;
1433 }
1434
1435 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1436 {
1437         struct acpi_video_bus *video = seq->private;
1438
1439
1440         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1441
1442         return 0;
1443 }
1444
1445 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1446 {
1447         return single_open(file, acpi_video_bus_POST_seq_show,
1448                            PDE(inode)->data);
1449 }
1450
1451 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1452 {
1453         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1454 }
1455
1456 static ssize_t
1457 acpi_video_bus_write_POST(struct file *file,
1458                           const char __user * buffer,
1459                           size_t count, loff_t * data)
1460 {
1461         int status;
1462         struct seq_file *m = file->private_data;
1463         struct acpi_video_bus *video = m->private;
1464         char str[12] = { 0 };
1465         unsigned long long opt, options;
1466
1467
1468         if (!video || count + 1 > sizeof str)
1469                 return -EINVAL;
1470
1471         status = acpi_video_bus_POST_options(video, &options);
1472         if (!ACPI_SUCCESS(status))
1473                 return -EINVAL;
1474
1475         if (copy_from_user(str, buffer, count))
1476                 return -EFAULT;
1477
1478         str[count] = 0;
1479         opt = strtoul(str, NULL, 0);
1480         if (opt > 3)
1481                 return -EFAULT;
1482
1483         /* just in case an OEM 'forgot' the motherboard... */
1484         options |= 1;
1485
1486         if (options & (1ul << opt)) {
1487                 status = acpi_video_bus_set_POST(video, opt);
1488                 if (!ACPI_SUCCESS(status))
1489                         return -EFAULT;
1490
1491         }
1492
1493         return count;
1494 }
1495
1496 static ssize_t
1497 acpi_video_bus_write_DOS(struct file *file,
1498                          const char __user * buffer,
1499                          size_t count, loff_t * data)
1500 {
1501         int status;
1502         struct seq_file *m = file->private_data;
1503         struct acpi_video_bus *video = m->private;
1504         char str[12] = { 0 };
1505         unsigned long opt;
1506
1507
1508         if (!video || count + 1 > sizeof str)
1509                 return -EINVAL;
1510
1511         if (copy_from_user(str, buffer, count))
1512                 return -EFAULT;
1513
1514         str[count] = 0;
1515         opt = strtoul(str, NULL, 0);
1516         if (opt > 7)
1517                 return -EFAULT;
1518
1519         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1520
1521         if (!ACPI_SUCCESS(status))
1522                 return -EFAULT;
1523
1524         return count;
1525 }
1526
1527 static int acpi_video_bus_add_fs(struct acpi_device *device)
1528 {
1529         struct acpi_video_bus *video = acpi_driver_data(device);
1530         struct proc_dir_entry *device_dir;
1531         struct proc_dir_entry *entry;
1532
1533         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1534         if (!device_dir)
1535                 return -ENOMEM;
1536
1537         /* 'info' [R] */
1538         entry = proc_create_data("info", S_IRUGO, device_dir,
1539                                  &acpi_video_bus_info_fops,
1540                                  acpi_driver_data(device));
1541         if (!entry)
1542                 goto err_remove_dir;
1543
1544         /* 'ROM' [R] */
1545         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1546                                  &acpi_video_bus_ROM_fops,
1547                                  acpi_driver_data(device));
1548         if (!entry)
1549                 goto err_remove_info;
1550
1551         /* 'POST_info' [R] */
1552         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1553                                  &acpi_video_bus_POST_info_fops,
1554                                  acpi_driver_data(device));
1555         if (!entry)
1556                 goto err_remove_rom;
1557
1558         /* 'POST' [R/W] */
1559         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1560                                  device_dir,
1561                                  &acpi_video_bus_POST_fops,
1562                                  acpi_driver_data(device));
1563         if (!entry)
1564                 goto err_remove_post_info;
1565
1566         /* 'DOS' [R/W] */
1567         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1568                                  device_dir,
1569                                  &acpi_video_bus_DOS_fops,
1570                                  acpi_driver_data(device));
1571         if (!entry)
1572                 goto err_remove_post;
1573
1574         video->dir = acpi_device_dir(device) = device_dir;
1575         return 0;
1576
1577  err_remove_post:
1578         remove_proc_entry("POST", device_dir);
1579  err_remove_post_info:
1580         remove_proc_entry("POST_info", device_dir);
1581  err_remove_rom:
1582         remove_proc_entry("ROM", device_dir);
1583  err_remove_info:
1584         remove_proc_entry("info", device_dir);
1585  err_remove_dir:
1586         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1587         return -ENOMEM;
1588 }
1589
1590 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1591 {
1592         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1593
1594         if (device_dir) {
1595                 remove_proc_entry("info", device_dir);
1596                 remove_proc_entry("ROM", device_dir);
1597                 remove_proc_entry("POST_info", device_dir);
1598                 remove_proc_entry("POST", device_dir);
1599                 remove_proc_entry("DOS", device_dir);
1600                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1601                 acpi_device_dir(device) = NULL;
1602         }
1603
1604         return 0;
1605 }
1606
1607 /* --------------------------------------------------------------------------
1608                                  Driver Interface
1609    -------------------------------------------------------------------------- */
1610
1611 /* device interface */
1612 static struct acpi_video_device_attrib*
1613 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1614 {
1615         struct acpi_video_enumerated_device *ids;
1616         int i;
1617
1618         for (i = 0; i < video->attached_count; i++) {
1619                 ids = &video->attached_array[i];
1620                 if ((ids->value.int_val & 0xffff) == device_id)
1621                         return &ids->value.attrib;
1622         }
1623
1624         return NULL;
1625 }
1626
1627 static int
1628 acpi_video_bus_get_one_device(struct acpi_device *device,
1629                               struct acpi_video_bus *video)
1630 {
1631         unsigned long long device_id;
1632         int status;
1633         struct acpi_video_device *data;
1634         struct acpi_video_device_attrib* attribute;
1635
1636         if (!device || !video)
1637                 return -EINVAL;
1638
1639         status =
1640             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1641         if (ACPI_SUCCESS(status)) {
1642
1643                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1644                 if (!data)
1645                         return -ENOMEM;
1646
1647                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1648                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1649                 device->driver_data = data;
1650
1651                 data->device_id = device_id;
1652                 data->video = video;
1653                 data->dev = device;
1654
1655                 attribute = acpi_video_get_device_attr(video, device_id);
1656
1657                 if((attribute != NULL) && attribute->device_id_scheme) {
1658                         switch (attribute->display_type) {
1659                         case ACPI_VIDEO_DISPLAY_CRT:
1660                                 data->flags.crt = 1;
1661                                 break;
1662                         case ACPI_VIDEO_DISPLAY_TV:
1663                                 data->flags.tvout = 1;
1664                                 break;
1665                         case ACPI_VIDEO_DISPLAY_DVI:
1666                                 data->flags.dvi = 1;
1667                                 break;
1668                         case ACPI_VIDEO_DISPLAY_LCD:
1669                                 data->flags.lcd = 1;
1670                                 break;
1671                         default:
1672                                 data->flags.unknown = 1;
1673                                 break;
1674                         }
1675                         if(attribute->bios_can_detect)
1676                                 data->flags.bios = 1;
1677                 } else
1678                         data->flags.unknown = 1;
1679
1680                 acpi_video_device_bind(video, data);
1681                 acpi_video_device_find_cap(data);
1682
1683                 status = acpi_install_notify_handler(device->handle,
1684                                                      ACPI_DEVICE_NOTIFY,
1685                                                      acpi_video_device_notify,
1686                                                      data);
1687                 if (ACPI_FAILURE(status)) {
1688                         printk(KERN_ERR PREFIX
1689                                           "Error installing notify handler\n");
1690                         if(data->brightness)
1691                                 kfree(data->brightness->levels);
1692                         kfree(data->brightness);
1693                         kfree(data);
1694                         return -ENODEV;
1695                 }
1696
1697                 mutex_lock(&video->device_list_lock);
1698                 list_add_tail(&data->entry, &video->video_device_list);
1699                 mutex_unlock(&video->device_list_lock);
1700
1701                 acpi_video_device_add_fs(device);
1702
1703                 return 0;
1704         }
1705
1706         return -ENOENT;
1707 }
1708
1709 /*
1710  *  Arg:
1711  *      video   : video bus device
1712  *
1713  *  Return:
1714  *      none
1715  *
1716  *  Enumerate the video device list of the video bus,
1717  *  bind the ids with the corresponding video devices
1718  *  under the video bus.
1719  */
1720
1721 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1722 {
1723         struct acpi_video_device *dev;
1724
1725         mutex_lock(&video->device_list_lock);
1726
1727         list_for_each_entry(dev, &video->video_device_list, entry)
1728                 acpi_video_device_bind(video, dev);
1729
1730         mutex_unlock(&video->device_list_lock);
1731 }
1732
1733 /*
1734  *  Arg:
1735  *      video   : video bus device
1736  *      device  : video output device under the video
1737  *              bus
1738  *
1739  *  Return:
1740  *      none
1741  *
1742  *  Bind the ids with the corresponding video devices
1743  *  under the video bus.
1744  */
1745
1746 static void
1747 acpi_video_device_bind(struct acpi_video_bus *video,
1748                        struct acpi_video_device *device)
1749 {
1750         struct acpi_video_enumerated_device *ids;
1751         int i;
1752
1753         for (i = 0; i < video->attached_count; i++) {
1754                 ids = &video->attached_array[i];
1755                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1756                         ids->bind_info = device;
1757                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1758                 }
1759         }
1760 }
1761
1762 /*
1763  *  Arg:
1764  *      video   : video bus device
1765  *
1766  *  Return:
1767  *      < 0     : error
1768  *
1769  *  Call _DOD to enumerate all devices attached to display adapter
1770  *
1771  */
1772
1773 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1774 {
1775         int status;
1776         int count;
1777         int i;
1778         struct acpi_video_enumerated_device *active_list;
1779         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1780         union acpi_object *dod = NULL;
1781         union acpi_object *obj;
1782
1783         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1784         if (!ACPI_SUCCESS(status)) {
1785                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1786                 return status;
1787         }
1788
1789         dod = buffer.pointer;
1790         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1791                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1792                 status = -EFAULT;
1793                 goto out;
1794         }
1795
1796         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1797                           dod->package.count));
1798
1799         active_list = kcalloc(1 + dod->package.count,
1800                               sizeof(struct acpi_video_enumerated_device),
1801                               GFP_KERNEL);
1802         if (!active_list) {
1803                 status = -ENOMEM;
1804                 goto out;
1805         }
1806
1807         count = 0;
1808         for (i = 0; i < dod->package.count; i++) {
1809                 obj = &dod->package.elements[i];
1810
1811                 if (obj->type != ACPI_TYPE_INTEGER) {
1812                         printk(KERN_ERR PREFIX
1813                                 "Invalid _DOD data in element %d\n", i);
1814                         continue;
1815                 }
1816
1817                 active_list[count].value.int_val = obj->integer.value;
1818                 active_list[count].bind_info = NULL;
1819                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1820                                   (int)obj->integer.value));
1821                 count++;
1822         }
1823
1824         kfree(video->attached_array);
1825
1826         video->attached_array = active_list;
1827         video->attached_count = count;
1828
1829  out:
1830         kfree(buffer.pointer);
1831         return status;
1832 }
1833
1834 static int
1835 acpi_video_get_next_level(struct acpi_video_device *device,
1836                           u32 level_current, u32 event)
1837 {
1838         int min, max, min_above, max_below, i, l, delta = 255;
1839         max = max_below = 0;
1840         min = min_above = 255;
1841         /* Find closest level to level_current */
1842         for (i = 2; i < device->brightness->count; i++) {
1843                 l = device->brightness->levels[i];
1844                 if (abs(l - level_current) < abs(delta)) {
1845                         delta = l - level_current;
1846                         if (!delta)
1847                                 break;
1848                 }
1849         }
1850         /* Ajust level_current to closest available level */
1851         level_current += delta;
1852         for (i = 2; i < device->brightness->count; i++) {
1853                 l = device->brightness->levels[i];
1854                 if (l < min)
1855                         min = l;
1856                 if (l > max)
1857                         max = l;
1858                 if (l < min_above && l > level_current)
1859                         min_above = l;
1860                 if (l > max_below && l < level_current)
1861                         max_below = l;
1862         }
1863
1864         switch (event) {
1865         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1866                 return (level_current < max) ? min_above : min;
1867         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1868                 return (level_current < max) ? min_above : max;
1869         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1870                 return (level_current > min) ? max_below : min;
1871         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1872         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1873                 return 0;
1874         default:
1875                 return level_current;
1876         }
1877 }
1878
1879 static int
1880 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1881 {
1882         unsigned long long level_current, level_next;
1883         int result = -EINVAL;
1884
1885         if (!device->brightness)
1886                 goto out;
1887
1888         result = acpi_video_device_lcd_get_level_current(device,
1889                                                          &level_current);
1890         if (result)
1891                 goto out;
1892
1893         level_next = acpi_video_get_next_level(device, level_current, event);
1894
1895         result = acpi_video_device_lcd_set_level(device, level_next);
1896
1897 out:
1898         if (result)
1899                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1900
1901         return result;
1902 }
1903
1904 static int
1905 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1906                            struct acpi_device *device)
1907 {
1908         int status = 0;
1909         struct acpi_device *dev;
1910
1911         acpi_video_device_enumerate(video);
1912
1913         list_for_each_entry(dev, &device->children, node) {
1914
1915                 status = acpi_video_bus_get_one_device(dev, video);
1916                 if (ACPI_FAILURE(status)) {
1917                         printk(KERN_WARNING PREFIX
1918                                         "Cant attach device");
1919                         continue;
1920                 }
1921         }
1922         return status;
1923 }
1924
1925 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1926 {
1927         acpi_status status;
1928         struct acpi_video_bus *video;
1929
1930
1931         if (!device || !device->video)
1932                 return -ENOENT;
1933
1934         video = device->video;
1935
1936         acpi_video_device_remove_fs(device->dev);
1937
1938         status = acpi_remove_notify_handler(device->dev->handle,
1939                                             ACPI_DEVICE_NOTIFY,
1940                                             acpi_video_device_notify);
1941         backlight_device_unregister(device->backlight);
1942         if (device->cdev) {
1943                 sysfs_remove_link(&device->dev->dev.kobj,
1944                                   "thermal_cooling");
1945                 sysfs_remove_link(&device->cdev->device.kobj,
1946                                   "device");
1947                 thermal_cooling_device_unregister(device->cdev);
1948                 device->cdev = NULL;
1949         }
1950         video_output_unregister(device->output_dev);
1951
1952         return 0;
1953 }
1954
1955 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1956 {
1957         int status;
1958         struct acpi_video_device *dev, *next;
1959
1960         mutex_lock(&video->device_list_lock);
1961
1962         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1963
1964                 status = acpi_video_bus_put_one_device(dev);
1965                 if (ACPI_FAILURE(status))
1966                         printk(KERN_WARNING PREFIX
1967                                "hhuuhhuu bug in acpi video driver.\n");
1968
1969                 if (dev->brightness) {
1970                         kfree(dev->brightness->levels);
1971                         kfree(dev->brightness);
1972                 }
1973                 list_del(&dev->entry);
1974                 kfree(dev);
1975         }
1976
1977         mutex_unlock(&video->device_list_lock);
1978
1979         return 0;
1980 }
1981
1982 /* acpi_video interface */
1983
1984 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1985 {
1986         return acpi_video_bus_DOS(video, 0, 0);
1987 }
1988
1989 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1990 {
1991         return acpi_video_bus_DOS(video, 0, 1);
1992 }
1993
1994 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1995 {
1996         struct acpi_video_bus *video = acpi_driver_data(device);
1997         struct input_dev *input;
1998         int keycode;
1999
2000         if (!video)
2001                 return;
2002
2003         input = video->input;
2004
2005         switch (event) {
2006         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2007                                          * most likely via hotkey. */
2008                 acpi_bus_generate_proc_event(device, event, 0);
2009                 keycode = KEY_SWITCHVIDEOMODE;
2010                 break;
2011
2012         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2013                                          * connector. */
2014                 acpi_video_device_enumerate(video);
2015                 acpi_video_device_rebind(video);
2016                 acpi_bus_generate_proc_event(device, event, 0);
2017                 keycode = KEY_SWITCHVIDEOMODE;
2018                 break;
2019
2020         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2021                 acpi_bus_generate_proc_event(device, event, 0);
2022                 keycode = KEY_SWITCHVIDEOMODE;
2023                 break;
2024         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2025                 acpi_bus_generate_proc_event(device, event, 0);
2026                 keycode = KEY_VIDEO_NEXT;
2027                 break;
2028         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2029                 acpi_bus_generate_proc_event(device, event, 0);
2030                 keycode = KEY_VIDEO_PREV;
2031                 break;
2032
2033         default:
2034                 keycode = KEY_UNKNOWN;
2035                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2036                                   "Unsupported event [0x%x]\n", event));
2037                 break;
2038         }
2039
2040         acpi_notifier_call_chain(device, event, 0);
2041         input_report_key(input, keycode, 1);
2042         input_sync(input);
2043         input_report_key(input, keycode, 0);
2044         input_sync(input);
2045
2046         return;
2047 }
2048
2049 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2050 {
2051         struct acpi_video_device *video_device = data;
2052         struct acpi_device *device = NULL;
2053         struct acpi_video_bus *bus;
2054         struct input_dev *input;
2055         int keycode;
2056
2057         if (!video_device)
2058                 return;
2059
2060         device = video_device->dev;
2061         bus = video_device->video;
2062         input = bus->input;
2063
2064         switch (event) {
2065         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
2066                 if (brightness_switch_enabled)
2067                         acpi_video_switch_brightness(video_device, event);
2068                 acpi_bus_generate_proc_event(device, event, 0);
2069                 keycode = KEY_BRIGHTNESS_CYCLE;
2070                 break;
2071         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
2072                 if (brightness_switch_enabled)
2073                         acpi_video_switch_brightness(video_device, event);
2074                 acpi_bus_generate_proc_event(device, event, 0);
2075                 keycode = KEY_BRIGHTNESSUP;
2076                 break;
2077         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2078                 if (brightness_switch_enabled)
2079                         acpi_video_switch_brightness(video_device, event);
2080                 acpi_bus_generate_proc_event(device, event, 0);
2081                 keycode = KEY_BRIGHTNESSDOWN;
2082                 break;
2083         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2084                 if (brightness_switch_enabled)
2085                         acpi_video_switch_brightness(video_device, event);
2086                 acpi_bus_generate_proc_event(device, event, 0);
2087                 keycode = KEY_BRIGHTNESS_ZERO;
2088                 break;
2089         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2090                 if (brightness_switch_enabled)
2091                         acpi_video_switch_brightness(video_device, event);
2092                 acpi_bus_generate_proc_event(device, event, 0);
2093                 keycode = KEY_DISPLAY_OFF;
2094                 break;
2095         default:
2096                 keycode = KEY_UNKNOWN;
2097                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2098                                   "Unsupported event [0x%x]\n", event));
2099                 break;
2100         }
2101
2102         acpi_notifier_call_chain(device, event, 0);
2103         input_report_key(input, keycode, 1);
2104         input_sync(input);
2105         input_report_key(input, keycode, 0);
2106         input_sync(input);
2107
2108         return;
2109 }
2110
2111 static int instance;
2112 static int acpi_video_resume(struct acpi_device *device)
2113 {
2114         struct acpi_video_bus *video;
2115         struct acpi_video_device *video_device;
2116         int i;
2117
2118         if (!device || !acpi_driver_data(device))
2119                 return -EINVAL;
2120
2121         video = acpi_driver_data(device);
2122
2123         for (i = 0; i < video->attached_count; i++) {
2124                 video_device = video->attached_array[i].bind_info;
2125                 if (video_device && video_device->backlight)
2126                         acpi_video_set_brightness(video_device->backlight);
2127         }
2128         return AE_OK;
2129 }
2130
2131 static int acpi_video_bus_add(struct acpi_device *device)
2132 {
2133         struct acpi_video_bus *video;
2134         struct input_dev *input;
2135         int error;
2136
2137         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2138         if (!video)
2139                 return -ENOMEM;
2140
2141         /* a hack to fix the duplicate name "VID" problem on T61 */
2142         if (!strcmp(device->pnp.bus_id, "VID")) {
2143                 if (instance)
2144                         device->pnp.bus_id[3] = '0' + instance;
2145                 instance ++;
2146         }
2147         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2148         if (!strcmp(device->pnp.bus_id, "VGA")) {
2149                 if (instance)
2150                         device->pnp.bus_id[3] = '0' + instance;
2151                 instance++;
2152         }
2153
2154         video->device = device;
2155         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2156         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2157         device->driver_data = video;
2158
2159         acpi_video_bus_find_cap(video);
2160         error = acpi_video_bus_check(video);
2161         if (error)
2162                 goto err_free_video;
2163
2164         error = acpi_video_bus_add_fs(device);
2165         if (error)
2166                 goto err_free_video;
2167
2168         mutex_init(&video->device_list_lock);
2169         INIT_LIST_HEAD(&video->video_device_list);
2170
2171         acpi_video_bus_get_devices(video, device);
2172         acpi_video_bus_start_devices(video);
2173
2174         video->input = input = input_allocate_device();
2175         if (!input) {
2176                 error = -ENOMEM;
2177                 goto err_stop_video;
2178         }
2179
2180         snprintf(video->phys, sizeof(video->phys),
2181                 "%s/video/input0", acpi_device_hid(video->device));
2182
2183         input->name = acpi_device_name(video->device);
2184         input->phys = video->phys;
2185         input->id.bustype = BUS_HOST;
2186         input->id.product = 0x06;
2187         input->dev.parent = &device->dev;
2188         input->evbit[0] = BIT(EV_KEY);
2189         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2190         set_bit(KEY_VIDEO_NEXT, input->keybit);
2191         set_bit(KEY_VIDEO_PREV, input->keybit);
2192         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2193         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2194         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2195         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2196         set_bit(KEY_DISPLAY_OFF, input->keybit);
2197         set_bit(KEY_UNKNOWN, input->keybit);
2198
2199         error = input_register_device(input);
2200         if (error)
2201                 goto err_free_input_dev;
2202
2203         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2204                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2205                video->flags.multihead ? "yes" : "no",
2206                video->flags.rom ? "yes" : "no",
2207                video->flags.post ? "yes" : "no");
2208
2209         return 0;
2210
2211  err_free_input_dev:
2212         input_free_device(input);
2213  err_stop_video:
2214         acpi_video_bus_stop_devices(video);
2215         acpi_video_bus_put_devices(video);
2216         kfree(video->attached_array);
2217         acpi_video_bus_remove_fs(device);
2218  err_free_video:
2219         kfree(video);
2220         device->driver_data = NULL;
2221
2222         return error;
2223 }
2224
2225 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2226 {
2227         struct acpi_video_bus *video = NULL;
2228
2229
2230         if (!device || !acpi_driver_data(device))
2231                 return -EINVAL;
2232
2233         video = acpi_driver_data(device);
2234
2235         acpi_video_bus_stop_devices(video);
2236         acpi_video_bus_put_devices(video);
2237         acpi_video_bus_remove_fs(device);
2238
2239         input_unregister_device(video->input);
2240         kfree(video->attached_array);
2241         kfree(video);
2242
2243         return 0;
2244 }
2245
2246 static int __init intel_opregion_present(void)
2247 {
2248 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2249         struct pci_dev *dev = NULL;
2250         u32 address;
2251
2252         for_each_pci_dev(dev) {
2253                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2254                         continue;
2255                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2256                         continue;
2257                 pci_read_config_dword(dev, 0xfc, &address);
2258                 if (!address)
2259                         continue;
2260                 return 1;
2261         }
2262 #endif
2263         return 0;
2264 }
2265
2266 int acpi_video_register(void)
2267 {
2268         int result = 0;
2269
2270         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2271         if (!acpi_video_dir)
2272                 return -ENODEV;
2273
2274         result = acpi_bus_register_driver(&acpi_video_bus);
2275         if (result < 0) {
2276                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2277                 return -ENODEV;
2278         }
2279
2280         return 0;
2281 }
2282 EXPORT_SYMBOL(acpi_video_register);
2283
2284 /*
2285  * This is kind of nasty. Hardware using Intel chipsets may require
2286  * the video opregion code to be run first in order to initialise
2287  * state before any ACPI video calls are made. To handle this we defer
2288  * registration of the video class until the opregion code has run.
2289  */
2290
2291 static int __init acpi_video_init(void)
2292 {
2293         if (intel_opregion_present())
2294                 return 0;
2295
2296         return acpi_video_register();
2297 }
2298
2299 void __exit acpi_video_exit(void)
2300 {
2301
2302         acpi_bus_unregister_driver(&acpi_video_bus);
2303
2304         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2305
2306         return;
2307 }
2308 EXPORT_SYMBOL(acpi_video_exit);
2309
2310 module_init(acpi_video_init);
2311 module_exit(acpi_video_exit);