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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 <linux/sort.h>
  40 #include <linux/pci.h>
  41 #include <linux/pci_ids.h>
  42 #include <asm/uaccess.h>
  43 #include <linux/dmi.h>
  44 #include <acpi/acpi_bus.h>
  45 #include <acpi/acpi_drivers.h>
  46
  47 #define PREFIX "ACPI: "
  48
  49 #define ACPI_VIDEO_CLASS                "video"
  50 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  51 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  52 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  53 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  54 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  55 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  56 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  57
  58 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  59 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  60 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  61 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  62 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  63
  64 #define MAX_NAME_LEN    20
  65
  66 #define ACPI_VIDEO_DISPLAY_CRT  1
  67 #define ACPI_VIDEO_DISPLAY_TV   2
  68 #define ACPI_VIDEO_DISPLAY_DVI  3
  69 #define ACPI_VIDEO_DISPLAY_LCD  4
  70
  71 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  72 ACPI_MODULE_NAME("video");
  73
  74 MODULE_AUTHOR("Bruno Ducrot");
  75 MODULE_DESCRIPTION("ACPI Video Driver");
  76 MODULE_LICENSE("GPL");
  77
  78 static int brightness_switch_enabled = 1;
  79 module_param(brightness_switch_enabled, bool, 0644);
  80
  81 static int register_count = 0;
  82 static int acpi_video_bus_add(struct acpi_device *device);
  83 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  84 static int acpi_video_resume(struct acpi_device *device);
  85 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  86
  87 static const struct acpi_device_id video_device_ids[] = {
  88         {ACPI_VIDEO_HID, 0},
  89         {"", 0},
  90 };
  91 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  92
  93 static struct acpi_driver acpi_video_bus = {
  94         .name = "video",
  95         .class = ACPI_VIDEO_CLASS,
  96         .ids = video_device_ids,
  97         .ops = {
  98                 .add = acpi_video_bus_add,
  99                 .remove = acpi_video_bus_remove,
 100                 .resume = acpi_video_resume,
 101                 .notify = acpi_video_bus_notify,
 102                 },
 103 };
 104
 105 struct acpi_video_bus_flags {
 106         u8 multihead:1;         /* can switch video heads */
 107         u8 rom:1;               /* can retrieve a video rom */
 108         u8 post:1;              /* can configure the head to */
 109         u8 reserved:5;
 110 };
 111
 112 struct acpi_video_bus_cap {
 113         u8 _DOS:1;              /*Enable/Disable output switching */
 114         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 115         u8 _ROM:1;              /*Get ROM Data */
 116         u8 _GPD:1;              /*Get POST Device */
 117         u8 _SPD:1;              /*Set POST Device */
 118         u8 _VPO:1;              /*Video POST Options */
 119         u8 reserved:2;
 120 };
 121
 122 struct acpi_video_device_attrib {
 123         u32 display_index:4;    /* A zero-based instance of the Display */
 124         u32 display_port_attachment:4;  /*This field differentiates the display type */
 125         u32 display_type:4;     /*Describe the specific type in use */
 126         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 127         u32 bios_can_detect:1;  /*BIOS can detect the device */
 128         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 129                                    the VGA device. */
 130         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 131         u32 reserved:10;        /*Must be 0 */
 132         u32 device_id_scheme:1; /*Device ID Scheme */
 133 };
 134
 135 struct acpi_video_enumerated_device {
 136         union {
 137                 u32 int_val;
 138                 struct acpi_video_device_attrib attrib;
 139         } value;
 140         struct acpi_video_device *bind_info;
 141 };
 142
 143 struct acpi_video_bus {
 144         struct acpi_device *device;
 145         u8 dos_setting;
 146         struct acpi_video_enumerated_device *attached_array;
 147         u8 attached_count;
 148         struct acpi_video_bus_cap cap;
 149         struct acpi_video_bus_flags flags;
 150         struct list_head video_device_list;
 151         struct mutex device_list_lock;  /* protects video_device_list */
 152         struct proc_dir_entry *dir;
 153         struct input_dev *input;
 154         char phys[32];  /* for input device */
 155 };
 156
 157 struct acpi_video_device_flags {
 158         u8 crt:1;
 159         u8 lcd:1;
 160         u8 tvout:1;
 161         u8 dvi:1;
 162         u8 bios:1;
 163         u8 unknown:1;
 164         u8 reserved:2;
 165 };
 166
 167 struct acpi_video_device_cap {
 168         u8 _ADR:1;              /*Return the unique ID */
 169         u8 _BCL:1;              /*Query list of brightness control levels supported */
 170         u8 _BCM:1;              /*Set the brightness level */
 171         u8 _BQC:1;              /* Get current brightness level */
 172         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 173         u8 _DDC:1;              /*Return the EDID for this device */
 174         u8 _DCS:1;              /*Return status of output device */
 175         u8 _DGS:1;              /*Query graphics state */
 176         u8 _DSS:1;              /*Device state set */
 177 };
 178
 179 struct acpi_video_brightness_flags {
 180         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 181         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
 182         u8 _BCL_use_index:1;            /* levels in _BCL are index values */
 183         u8 _BCM_use_index:1;            /* input of _BCM is an index value */
 184         u8 _BQC_use_index:1;            /* _BQC returns an index value */
 185 };
 186
 187 struct acpi_video_device_brightness {
 188         int curr;
 189         int count;
 190         int *levels;
 191         struct acpi_video_brightness_flags flags;
 192 };
 193
 194 struct acpi_video_device {
 195         unsigned long device_id;
 196         struct acpi_video_device_flags flags;
 197         struct acpi_video_device_cap cap;
 198         struct list_head entry;
 199         struct acpi_video_bus *video;
 200         struct acpi_device *dev;
 201         struct acpi_video_device_brightness *brightness;
 202         struct backlight_device *backlight;
 203         struct thermal_cooling_device *cooling_dev;
 204         struct output_device *output_dev;
 205 };
 206
 207 /* bus */
 208 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
 209 static const struct file_operations acpi_video_bus_info_fops = {
 210         .owner = THIS_MODULE,
 211         .open = acpi_video_bus_info_open_fs,
 212         .read = seq_read,
 213         .llseek = seq_lseek,
 214         .release = single_release,
 215 };
 216
 217 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
 218 static const struct file_operations acpi_video_bus_ROM_fops = {
 219         .owner = THIS_MODULE,
 220         .open = acpi_video_bus_ROM_open_fs,
 221         .read = seq_read,
 222         .llseek = seq_lseek,
 223         .release = single_release,
 224 };
 225
 226 static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
 227                                             struct file *file);
 228 static const struct file_operations acpi_video_bus_POST_info_fops = {
 229         .owner = THIS_MODULE,
 230         .open = acpi_video_bus_POST_info_open_fs,
 231         .read = seq_read,
 232         .llseek = seq_lseek,
 233         .release = single_release,
 234 };
 235
 236 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
 237 static ssize_t acpi_video_bus_write_POST(struct file *file,
 238         const char __user *buffer, size_t count, loff_t *data);
 239 static const struct file_operations acpi_video_bus_POST_fops = {
 240         .owner = THIS_MODULE,
 241         .open = acpi_video_bus_POST_open_fs,
 242         .read = seq_read,
 243         .write = acpi_video_bus_write_POST,
 244         .llseek = seq_lseek,
 245         .release = single_release,
 246 };
 247
 248 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
 249 static ssize_t acpi_video_bus_write_DOS(struct file *file,
 250         const char __user *buffer, size_t count, loff_t *data);
 251 static const struct file_operations acpi_video_bus_DOS_fops = {
 252         .owner = THIS_MODULE,
 253         .open = acpi_video_bus_DOS_open_fs,
 254         .read = seq_read,
 255         .write = acpi_video_bus_write_DOS,
 256         .llseek = seq_lseek,
 257         .release = single_release,
 258 };
 259
 260 /* device */
 261 static int acpi_video_device_info_open_fs(struct inode *inode,
 262                                           struct file *file);
 263 static const struct file_operations acpi_video_device_info_fops = {
 264         .owner = THIS_MODULE,
 265         .open = acpi_video_device_info_open_fs,
 266         .read = seq_read,
 267         .llseek = seq_lseek,
 268         .release = single_release,
 269 };
 270
 271 static int acpi_video_device_state_open_fs(struct inode *inode,
 272                                            struct file *file);
 273 static ssize_t acpi_video_device_write_state(struct file *file,
 274         const char __user *buffer, size_t count, loff_t *data);
 275 static const struct file_operations acpi_video_device_state_fops = {
 276         .owner = THIS_MODULE,
 277         .open = acpi_video_device_state_open_fs,
 278         .read = seq_read,
 279         .write = acpi_video_device_write_state,
 280         .llseek = seq_lseek,
 281         .release = single_release,
 282 };
 283
 284 static int acpi_video_device_brightness_open_fs(struct inode *inode,
 285                                                 struct file *file);
 286 static ssize_t acpi_video_device_write_brightness(struct file *file,
 287         const char __user *buffer, size_t count, loff_t *data);
 288 static const struct file_operations acpi_video_device_brightness_fops = {
 289         .owner = THIS_MODULE,
 290         .open = acpi_video_device_brightness_open_fs,
 291         .read = seq_read,
 292         .write = acpi_video_device_write_brightness,
 293         .llseek = seq_lseek,
 294         .release = single_release,
 295 };
 296
 297 static int acpi_video_device_EDID_open_fs(struct inode *inode,
 298                                           struct file *file);
 299 static const struct file_operations acpi_video_device_EDID_fops = {
 300         .owner = THIS_MODULE,
 301         .open = acpi_video_device_EDID_open_fs,
 302         .read = seq_read,
 303         .llseek = seq_lseek,
 304         .release = single_release,
 305 };
 306
 307 static const char device_decode[][30] = {
 308         "motherboard VGA device",
 309         "PCI VGA device",
 310         "AGP VGA device",
 311         "UNKNOWN",
 312 };
 313
 314 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 315 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 316 static void acpi_video_device_bind(struct acpi_video_bus *video,
 317                                    struct acpi_video_device *device);
 318 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 319 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 320                         int level);
 321 static int acpi_video_device_lcd_get_level_current(
 322                         struct acpi_video_device *device,
 323                         unsigned long long *level);
 324 static int acpi_video_get_next_level(struct acpi_video_device *device,
 325                                      u32 level_current, u32 event);
 326 static int acpi_video_switch_brightness(struct acpi_video_device *device,
 327                                          int event);
 328 static int acpi_video_device_get_state(struct acpi_video_device *device,
 329                             unsigned long long *state);
 330 static int acpi_video_output_get(struct output_device *od);
 331 static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
 332
 333 /*backlight device sysfs support*/
 334 static int acpi_video_get_brightness(struct backlight_device *bd)
 335 {
 336         unsigned long long cur_level;
 337         int i;
 338         struct acpi_video_device *vd =
 339                 (struct acpi_video_device *)bl_get_data(bd);
 340
 341         if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
 342                 return -EINVAL;
 343         for (i = 2; i < vd->brightness->count; i++) {
 344                 if (vd->brightness->levels[i] == cur_level)
 345                         /* The first two entries are special - see page 575
 346                            of the ACPI spec 3.0 */
 347                         return i-2;
 348         }
 349         return 0;
 350 }
 351
 352 static int acpi_video_set_brightness(struct backlight_device *bd)
 353 {
 354         int request_level = bd->props.brightness + 2;
 355         struct acpi_video_device *vd =
 356                 (struct acpi_video_device *)bl_get_data(bd);
 357
 358         return acpi_video_device_lcd_set_level(vd,
 359                                 vd->brightness->levels[request_level]);
 360 }
 361
 362 static struct backlight_ops acpi_backlight_ops = {
 363         .get_brightness = acpi_video_get_brightness,
 364         .update_status  = acpi_video_set_brightness,
 365 };
 366
 367 /*video output device sysfs support*/
 368 static int acpi_video_output_get(struct output_device *od)
 369 {
 370         unsigned long long state;
 371         struct acpi_video_device *vd =
 372                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 373         acpi_video_device_get_state(vd, &state);
 374         return (int)state;
 375 }
 376
 377 static int acpi_video_output_set(struct output_device *od)
 378 {
 379         unsigned long state = od->request_state;
 380         struct acpi_video_device *vd=
 381                 (struct acpi_video_device *)dev_get_drvdata(&od->dev);
 382         return acpi_video_device_set_state(vd, state);
 383 }
 384
 385 static struct output_properties acpi_output_properties = {
 386         .set_state = acpi_video_output_set,
 387         .get_status = acpi_video_output_get,
 388 };
 389
 390
 391 /* thermal cooling device callbacks */
 392 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
 393                                long *state)
 394 {
 395         struct acpi_device *device = cooling_dev->devdata;
 396         struct acpi_video_device *video = acpi_driver_data(device);
 397
 398         *state = video->brightness->count - 3;
 399         return 0;
 400 }
 401
 402 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
 403                                long *state)
 404 {
 405         struct acpi_device *device = cooling_dev->devdata;
 406         struct acpi_video_device *video = acpi_driver_data(device);
 407         unsigned long long level;
 408         int offset;
 409
 410         if (acpi_video_device_lcd_get_level_current(video, &level))
 411                 return -EINVAL;
 412         for (offset = 2; offset < video->brightness->count; offset++)
 413                 if (level == video->brightness->levels[offset]) {
 414                         *state = video->brightness->count - offset - 1;
 415                         return 0;
 416                 }
 417
 418         return -EINVAL;
 419 }
 420
 421 static int
 422 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
 423 {
 424         struct acpi_device *device = cooling_dev->devdata;
 425         struct acpi_video_device *video = acpi_driver_data(device);
 426         int level;
 427
 428         if ( state >= video->brightness->count - 2)
 429                 return -EINVAL;
 430
 431         state = video->brightness->count - state;
 432         level = video->brightness->levels[state -1];
 433         return acpi_video_device_lcd_set_level(video, level);
 434 }
 435
 436 static struct thermal_cooling_device_ops video_cooling_ops = {
 437         .get_max_state = video_get_max_state,
 438         .get_cur_state = video_get_cur_state,
 439         .set_cur_state = video_set_cur_state,
 440 };
 441
 442 /* --------------------------------------------------------------------------
 443                                Video Management
 444    -------------------------------------------------------------------------- */
 445
 446 /* device */
 447
 448 static int
 449 acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
 450 {
 451         int status;
 452
 453         status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
 454
 455         return status;
 456 }
 457
 458 static int
 459 acpi_video_device_get_state(struct acpi_video_device *device,
 460                             unsigned long long *state)
 461 {
 462         int status;
 463
 464         status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
 465
 466         return status;
 467 }
 468
 469 static int
 470 acpi_video_device_set_state(struct acpi_video_device *device, int state)
 471 {
 472         int status;
 473         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 474         struct acpi_object_list args = { 1, &arg0 };
 475         unsigned long long ret;
 476
 477
 478         arg0.integer.value = state;
 479         status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
 480
 481         return status;
 482 }
 483
 484 static int
 485 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 486                                    union acpi_object **levels)
 487 {
 488         int status;
 489         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 490         union acpi_object *obj;
 491
 492
 493         *levels = NULL;
 494
 495         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 496         if (!ACPI_SUCCESS(status))
 497                 return status;
 498         obj = (union acpi_object *)buffer.pointer;
 499         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 500                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 501                 status = -EFAULT;
 502                 goto err;
 503         }
 504
 505         *levels = obj;
 506
 507         return 0;
 508
 509       err:
 510         kfree(buffer.pointer);
 511
 512         return status;
 513 }
 514
 515 static int
 516 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 517 {
 518         int status;
 519         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 520         struct acpi_object_list args = { 1, &arg0 };
 521         int state;
 522
 523         arg0.integer.value = level;
 524
 525         status = acpi_evaluate_object(device->dev->handle, "_BCM",
 526                                       &args, NULL);
 527         if (ACPI_FAILURE(status)) {
 528                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 529                 return -EIO;
 530         }
 531
 532         device->brightness->curr = level;
 533         for (state = 2; state < device->brightness->count; state++)
 534                 if (level == device->brightness->levels[state]) {
 535                         if (device->backlight)
 536                                 device->backlight->props.brightness = state - 2;
 537                         return 0;
 538                 }
 539
 540         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 541         return -EINVAL;
 542 }
 543
 544 /*
 545  * For some buggy _BQC methods, we need to add a constant value to
 546  * the _BQC return value to get the actual current brightness level
 547  */
 548
 549 static int bqc_offset_aml_bug_workaround;
 550 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 551 {
 552         bqc_offset_aml_bug_workaround = 9;
 553         return 0;
 554 }
 555
 556 static struct dmi_system_id video_dmi_table[] __initdata = {
 557         /*
 558          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 559          */
 560         {
 561          .callback = video_set_bqc_offset,
 562          .ident = "Acer Aspire 5720",
 563          .matches = {
 564                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 565                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 566                 },
 567         },
 568         {
 569          .callback = video_set_bqc_offset,
 570          .ident = "Acer Aspire 5710Z",
 571          .matches = {
 572                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 573                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 574                 },
 575         },
 576         {
 577          .callback = video_set_bqc_offset,
 578          .ident = "eMachines E510",
 579          .matches = {
 580                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 581                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 582                 },
 583         },
 584         {
 585          .callback = video_set_bqc_offset,
 586          .ident = "Acer Aspire 5315",
 587          .matches = {
 588                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 589                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 590                 },
 591         },
 592         {
 593          .callback = video_set_bqc_offset,
 594          .ident = "Acer Aspire 7720",
 595          .matches = {
 596                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 597                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
 598                 },
 599         },
 600         {}
 601 };
 602
 603 static int
 604 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 605                                         unsigned long long *level)
 606 {
 607         acpi_status status = AE_OK;
 608         int i;
 609
 610         if (device->cap._BQC || device->cap._BCQ) {
 611                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 612
 613                 status = acpi_evaluate_integer(device->dev->handle, buf,
 614                                                 NULL, level);
 615                 if (ACPI_SUCCESS(status)) {
 616                         if (device->brightness->flags._BQC_use_index) {
 617                                 if (device->brightness->flags._BCL_reversed)
 618                                         *level = device->brightness->count
 619                                                                  - 3 - (*level);
 620                                 *level = device->brightness->levels[*level + 2];
 621
 622                         }
 623                         *level += bqc_offset_aml_bug_workaround;
 624                         for (i = 2; i < device->brightness->count; i++)
 625                                 if (device->brightness->levels[i] == *level) {
 626                                         device->brightness->curr = *level;
 627                                         return 0;
 628                         }
 629                         /* BQC returned an invalid level. Stop using it.  */
 630                         ACPI_WARNING((AE_INFO, "%s returned an invalid level",
 631                                                 buf));
 632                         device->cap._BQC = device->cap._BCQ = 0;
 633                 } else {
 634                         /* Fixme:
 635                          * should we return an error or ignore this failure?
 636                          * dev->brightness->curr is a cached value which stores
 637                          * the correct current backlight level in most cases.
 638                          * ACPI video backlight still works w/ buggy _BQC.
 639                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 640                          */
 641                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 642                         device->cap._BQC = device->cap._BCQ = 0;
 643                 }
 644         }
 645
 646         *level = device->brightness->curr;
 647         return 0;
 648 }
 649
 650 static int
 651 acpi_video_device_EDID(struct acpi_video_device *device,
 652                        union acpi_object **edid, ssize_t length)
 653 {
 654         int status;
 655         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 656         union acpi_object *obj;
 657         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 658         struct acpi_object_list args = { 1, &arg0 };
 659
 660
 661         *edid = NULL;
 662
 663         if (!device)
 664                 return -ENODEV;
 665         if (length == 128)
 666                 arg0.integer.value = 1;
 667         else if (length == 256)
 668                 arg0.integer.value = 2;
 669         else
 670                 return -EINVAL;
 671
 672         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 673         if (ACPI_FAILURE(status))
 674                 return -ENODEV;
 675
 676         obj = buffer.pointer;
 677
 678         if (obj && obj->type == ACPI_TYPE_BUFFER)
 679                 *edid = obj;
 680         else {
 681                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 682                 status = -EFAULT;
 683                 kfree(obj);
 684         }
 685
 686         return status;
 687 }
 688
 689 /* bus */
 690
 691 static int
 692 acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
 693 {
 694         int status;
 695         unsigned long long tmp;
 696         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 697         struct acpi_object_list args = { 1, &arg0 };
 698
 699
 700         arg0.integer.value = option;
 701
 702         status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
 703         if (ACPI_SUCCESS(status))
 704                 status = tmp ? (-EINVAL) : (AE_OK);
 705
 706         return status;
 707 }
 708
 709 static int
 710 acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
 711 {
 712         int status;
 713
 714         status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
 715
 716         return status;
 717 }
 718
 719 static int
 720 acpi_video_bus_POST_options(struct acpi_video_bus *video,
 721                             unsigned long long *options)
 722 {
 723         int status;
 724
 725         status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
 726         *options &= 3;
 727
 728         return status;
 729 }
 730
 731 /*
 732  *  Arg:
 733  *      video           : video bus device pointer
 734  *      bios_flag       :
 735  *              0.      The system BIOS should NOT automatically switch(toggle)
 736  *                      the active display output.
 737  *              1.      The system BIOS should automatically switch (toggle) the
 738  *                      active display output. No switch event.
 739  *              2.      The _DGS value should be locked.
 740  *              3.      The system BIOS should not automatically switch (toggle) the
 741  *                      active display output, but instead generate the display switch
 742  *                      event notify code.
 743  *      lcd_flag        :
 744  *              0.      The system BIOS should automatically control the brightness level
 745  *                      of the LCD when the power changes from AC to DC
 746  *              1.      The system BIOS should NOT automatically control the brightness
 747  *                      level of the LCD when the power changes from AC to DC.
 748  * Return Value:
 749  *              -1      wrong arg.
 750  */
 751
 752 static int
 753 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 754 {
 755         acpi_integer status = 0;
 756         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 757         struct acpi_object_list args = { 1, &arg0 };
 758
 759
 760         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 761                 status = -1;
 762                 goto Failed;
 763         }
 764         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 765         video->dos_setting = arg0.integer.value;
 766         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 767
 768       Failed:
 769         return status;
 770 }
 771
 772 /*
 773  * Simple comparison function used to sort backlight levels.
 774  */
 775
 776 static int
 777 acpi_video_cmp_level(const void *a, const void *b)
 778 {
 779         return *(int *)a - *(int *)b;
 780 }
 781
 782 /*
 783  *  Arg:
 784  *      device  : video output device (LCD, CRT, ..)
 785  *
 786  *  Return Value:
 787  *      Maximum brightness level
 788  *
 789  *  Allocate and initialize device->brightness.
 790  */
 791
 792 static int
 793 acpi_video_init_brightness(struct acpi_video_device *device)
 794 {
 795         union acpi_object *obj = NULL;
 796         int i, max_level = 0, count = 0, level_ac_battery = 0;
 797         unsigned long long level, level_old;
 798         union acpi_object *o;
 799         struct acpi_video_device_brightness *br = NULL;
 800         int result = -EINVAL;
 801
 802         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 803                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 804                                                 "LCD brightness level\n"));
 805                 goto out;
 806         }
 807
 808         if (obj->package.count < 2)
 809                 goto out;
 810
 811         br = kzalloc(sizeof(*br), GFP_KERNEL);
 812         if (!br) {
 813                 printk(KERN_ERR "can't allocate memory\n");
 814                 result = -ENOMEM;
 815                 goto out;
 816         }
 817
 818         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 819                                 GFP_KERNEL);
 820         if (!br->levels) {
 821                 result = -ENOMEM;
 822                 goto out_free;
 823         }
 824
 825         for (i = 0; i < obj->package.count; i++) {
 826                 o = (union acpi_object *)&obj->package.elements[i];
 827                 if (o->type != ACPI_TYPE_INTEGER) {
 828                         printk(KERN_ERR PREFIX "Invalid data\n");
 829                         continue;
 830                 }
 831                 br->levels[count] = (u32) o->integer.value;
 832
 833                 if (br->levels[count] > max_level)
 834                         max_level = br->levels[count];
 835                 count++;
 836         }
 837
 838         /*
 839          * some buggy BIOS don't export the levels
 840          * when machine is on AC/Battery in _BCL package.
 841          * In this case, the first two elements in _BCL packages
 842          * are also supported brightness levels that OS should take care of.
 843          */
 844         for (i = 2; i < count; i++) {
 845                 if (br->levels[i] == br->levels[0])
 846                         level_ac_battery++;
 847                 if (br->levels[i] == br->levels[1])
 848                         level_ac_battery++;
 849         }
 850
 851         if (level_ac_battery < 2) {
 852                 level_ac_battery = 2 - level_ac_battery;
 853                 br->flags._BCL_no_ac_battery_levels = 1;
 854                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 855                         br->levels[i] = br->levels[i - level_ac_battery];
 856                 count += level_ac_battery;
 857         } else if (level_ac_battery > 2)
 858                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 859
 860         /* Check if the _BCL package is in a reversed order */
 861         if (max_level == br->levels[2]) {
 862                 br->flags._BCL_reversed = 1;
 863                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 864                         acpi_video_cmp_level, NULL);
 865         } else if (max_level != br->levels[count - 1])
 866                 ACPI_ERROR((AE_INFO,
 867                             "Found unordered _BCL package\n"));
 868
 869         br->count = count;
 870         device->brightness = br;
 871
 872         /* Check the input/output of _BQC/_BCL/_BCM */
 873         if ((max_level < 100) && (max_level <= (count - 2)))
 874                 br->flags._BCL_use_index = 1;
 875
 876         /*
 877          * _BCM is always consistent with _BCL,
 878          * at least for all the laptops we have ever seen.
 879          */
 880         br->flags._BCM_use_index = br->flags._BCL_use_index;
 881
 882         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 883         br->curr = level = max_level;
 884
 885         if (!device->cap._BQC)
 886                 goto set_level;
 887
 888         result = acpi_video_device_lcd_get_level_current(device, &level_old);
 889         if (result)
 890                 goto out_free_levels;
 891
 892         /*
 893          * Set the level to maximum and check if _BQC uses indexed value
 894          */
 895         result = acpi_video_device_lcd_set_level(device, max_level);
 896         if (result)
 897                 goto out_free_levels;
 898
 899         result = acpi_video_device_lcd_get_level_current(device, &level);
 900         if (result)
 901                 goto out_free_levels;
 902
 903         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 904
 905         if (!br->flags._BQC_use_index) {
 906                 /*
 907                  * Set the backlight to the initial state.
 908                  * On some buggy laptops, _BQC returns an uninitialized value
 909                  * when invoked for the first time, i.e. level_old is invalid.
 910                  * set the backlight to max_level in this case
 911                  */
 912                 for (i = 2; i < br->count; i++)
 913                         if (level_old == br->levels[i])
 914                                 level = level_old;
 915                 goto set_level;
 916         }
 917
 918         if (br->flags._BCL_reversed)
 919                 level_old = (br->count - 1) - level_old;
 920         level = br->levels[level_old];
 921
 922 set_level:
 923         result = acpi_video_device_lcd_set_level(device, level);
 924         if (result)
 925                 goto out_free_levels;
 926
 927         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 928                           "found %d brightness levels\n", count - 2));
 929         kfree(obj);
 930         return result;
 931
 932 out_free_levels:
 933         kfree(br->levels);
 934 out_free:
 935         kfree(br);
 936 out:
 937         device->brightness = NULL;
 938         kfree(obj);
 939         return result;
 940 }
 941
 942 /*
 943  *  Arg:
 944  *      device  : video output device (LCD, CRT, ..)
 945  *
 946  *  Return Value:
 947  *      None
 948  *
 949  *  Find out all required AML methods defined under the output
 950  *  device.
 951  */
 952
 953 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 954 {
 955         acpi_handle h_dummy1;
 956
 957         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 958                 device->cap._ADR = 1;
 959         }
 960         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 961                 device->cap._BCL = 1;
 962         }
 963         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 964                 device->cap._BCM = 1;
 965         }
 966         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 967                 device->cap._BQC = 1;
 968         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 969                                 &h_dummy1))) {
 970                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 971                 device->cap._BCQ = 1;
 972         }
 973
 974         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 975                 device->cap._DDC = 1;
 976         }
 977         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
 978                 device->cap._DCS = 1;
 979         }
 980         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
 981                 device->cap._DGS = 1;
 982         }
 983         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
 984                 device->cap._DSS = 1;
 985         }
 986
 987         if (acpi_video_backlight_support()) {
 988                 int result;
 989                 static int count = 0;
 990                 char *name;
 991
 992                 result = acpi_video_init_brightness(device);
 993                 if (result)
 994                         return;
 995                 name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 996                 if (!name)
 997                         return;
 998
 999                 sprintf(name, "acpi_video%d", count++);
1000                 device->backlight = backlight_device_register(name,
1001                         NULL, device, &acpi_backlight_ops);
1002                 kfree(name);
1003                 if (IS_ERR(device->backlight))
1004                         return;
1005                 device->backlight->props.max_brightness = device->brightness->count-3;
1006
1007                 result = sysfs_create_link(&device->backlight->dev.kobj,
1008                                            &device->dev->dev.kobj, "device");
1009                 if (result)
1010                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1011
1012                 device->cooling_dev = thermal_cooling_device_register("LCD",
1013                                         device->dev, &video_cooling_ops);
1014                 if (IS_ERR(device->cooling_dev)) {
1015                         /*
1016                          * Set cooling_dev to NULL so we don't crash trying to
1017                          * free it.
1018                          * Also, why the hell we are returning early and
1019                          * not attempt to register video output if cooling
1020                          * device registration failed?
1021                          * -- dtor
1022                          */
1023                         device->cooling_dev = NULL;
1024                         return;
1025                 }
1026
1027                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1028                          device->cooling_dev->id);
1029                 result = sysfs_create_link(&device->dev->dev.kobj,
1030                                 &device->cooling_dev->device.kobj,
1031                                 "thermal_cooling");
1032                 if (result)
1033                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1034                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1035                                 &device->dev->dev.kobj, "device");
1036                 if (result)
1037                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1038
1039         }
1040
1041         if (acpi_video_display_switch_support()) {
1042
1043                 if (device->cap._DCS && device->cap._DSS) {
1044                         static int count;
1045                         char *name;
1046                         name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
1047                         if (!name)
1048                                 return;
1049                         sprintf(name, "acpi_video%d", count++);
1050                         device->output_dev = video_output_register(name,
1051                                         NULL, device, &acpi_output_properties);
1052                         kfree(name);
1053                 }
1054         }
1055 }
1056
1057 /*
1058  *  Arg:
1059  *      device  : video output device (VGA)
1060  *
1061  *  Return Value:
1062  *      None
1063  *
1064  *  Find out all required AML methods defined under the video bus device.
1065  */
1066
1067 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1068 {
1069         acpi_handle h_dummy1;
1070
1071         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1072                 video->cap._DOS = 1;
1073         }
1074         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1075                 video->cap._DOD = 1;
1076         }
1077         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1078                 video->cap._ROM = 1;
1079         }
1080         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1081                 video->cap._GPD = 1;
1082         }
1083         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1084                 video->cap._SPD = 1;
1085         }
1086         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1087                 video->cap._VPO = 1;
1088         }
1089 }
1090
1091 /*
1092  * Check whether the video bus device has required AML method to
1093  * support the desired features
1094  */
1095
1096 static int acpi_video_bus_check(struct acpi_video_bus *video)
1097 {
1098         acpi_status status = -ENOENT;
1099         struct pci_dev *dev;
1100
1101         if (!video)
1102                 return -EINVAL;
1103
1104         dev = acpi_get_pci_dev(video->device->handle);
1105         if (!dev)
1106                 return -ENODEV;
1107         pci_dev_put(dev);
1108
1109         /* Since there is no HID, CID and so on for VGA driver, we have
1110          * to check well known required nodes.
1111          */
1112
1113         /* Does this device support video switching? */
1114         if (video->cap._DOS || video->cap._DOD) {
1115                 if (!video->cap._DOS) {
1116                         printk(KERN_WARNING FW_BUG
1117                                 "ACPI(%s) defines _DOD but not _DOS\n",
1118                                 acpi_device_bid(video->device));
1119                 }
1120                 video->flags.multihead = 1;
1121                 status = 0;
1122         }
1123
1124         /* Does this device support retrieving a video ROM? */
1125         if (video->cap._ROM) {
1126                 video->flags.rom = 1;
1127                 status = 0;
1128         }
1129
1130         /* Does this device support configuring which video device to POST? */
1131         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1132                 video->flags.post = 1;
1133                 status = 0;
1134         }
1135
1136         return status;
1137 }
1138
1139 /* --------------------------------------------------------------------------
1140                               FS Interface (/proc)
1141    -------------------------------------------------------------------------- */
1142
1143 static struct proc_dir_entry *acpi_video_dir;
1144
1145 /* video devices */
1146
1147 static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
1148 {
1149         struct acpi_video_device *dev = seq->private;
1150
1151
1152         if (!dev)
1153                 goto end;
1154
1155         seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
1156         seq_printf(seq, "type:         ");
1157         if (dev->flags.crt)
1158                 seq_printf(seq, "CRT\n");
1159         else if (dev->flags.lcd)
1160                 seq_printf(seq, "LCD\n");
1161         else if (dev->flags.tvout)
1162                 seq_printf(seq, "TVOUT\n");
1163         else if (dev->flags.dvi)
1164                 seq_printf(seq, "DVI\n");
1165         else
1166                 seq_printf(seq, "UNKNOWN\n");
1167
1168         seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
1169
1170       end:
1171         return 0;
1172 }
1173
1174 static int
1175 acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
1176 {
1177         return single_open(file, acpi_video_device_info_seq_show,
1178                            PDE(inode)->data);
1179 }
1180
1181 static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
1182 {
1183         int status;
1184         struct acpi_video_device *dev = seq->private;
1185         unsigned long long state;
1186
1187
1188         if (!dev)
1189                 goto end;
1190
1191         status = acpi_video_device_get_state(dev, &state);
1192         seq_printf(seq, "state:     ");
1193         if (ACPI_SUCCESS(status))
1194                 seq_printf(seq, "0x%02llx\n", state);
1195         else
1196                 seq_printf(seq, "<not supported>\n");
1197
1198         status = acpi_video_device_query(dev, &state);
1199         seq_printf(seq, "query:     ");
1200         if (ACPI_SUCCESS(status))
1201                 seq_printf(seq, "0x%02llx\n", state);
1202         else
1203                 seq_printf(seq, "<not supported>\n");
1204
1205       end:
1206         return 0;
1207 }
1208
1209 static int
1210 acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
1211 {
1212         return single_open(file, acpi_video_device_state_seq_show,
1213                            PDE(inode)->data);
1214 }
1215
1216 static ssize_t
1217 acpi_video_device_write_state(struct file *file,
1218                               const char __user * buffer,
1219                               size_t count, loff_t * data)
1220 {
1221         int status;
1222         struct seq_file *m = file->private_data;
1223         struct acpi_video_device *dev = m->private;
1224         char str[12] = { 0 };
1225         u32 state = 0;
1226
1227
1228         if (!dev || count >= sizeof(str))
1229                 return -EINVAL;
1230
1231         if (copy_from_user(str, buffer, count))
1232                 return -EFAULT;
1233
1234         str[count] = 0;
1235         state = simple_strtoul(str, NULL, 0);
1236         state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
1237
1238         status = acpi_video_device_set_state(dev, state);
1239
1240         if (status)
1241                 return -EFAULT;
1242
1243         return count;
1244 }
1245
1246 static int
1247 acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
1248 {
1249         struct acpi_video_device *dev = seq->private;
1250         int i;
1251
1252
1253         if (!dev || !dev->brightness) {
1254                 seq_printf(seq, "<not supported>\n");
1255                 return 0;
1256         }
1257
1258         seq_printf(seq, "levels: ");
1259         for (i = 2; i < dev->brightness->count; i++)
1260                 seq_printf(seq, " %d", dev->brightness->levels[i]);
1261         seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);
1262
1263         return 0;
1264 }
1265
1266 static int
1267 acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
1268 {
1269         return single_open(file, acpi_video_device_brightness_seq_show,
1270                            PDE(inode)->data);
1271 }
1272
1273 static ssize_t
1274 acpi_video_device_write_brightness(struct file *file,
1275                                    const char __user * buffer,
1276                                    size_t count, loff_t * data)
1277 {
1278         struct seq_file *m = file->private_data;
1279         struct acpi_video_device *dev = m->private;
1280         char str[5] = { 0 };
1281         unsigned int level = 0;
1282         int i;
1283
1284
1285         if (!dev || !dev->brightness || count >= sizeof(str))
1286                 return -EINVAL;
1287
1288         if (copy_from_user(str, buffer, count))
1289                 return -EFAULT;
1290
1291         str[count] = 0;
1292         level = simple_strtoul(str, NULL, 0);
1293
1294         if (level > 100)
1295                 return -EFAULT;
1296
1297         /* validate through the list of available levels */
1298         for (i = 2; i < dev->brightness->count; i++)
1299                 if (level == dev->brightness->levels[i]) {
1300                         if (!acpi_video_device_lcd_set_level(dev, level))
1301                                 return count;
1302                         break;
1303                 }
1304
1305         return -EINVAL;
1306 }
1307
1308 static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
1309 {
1310         struct acpi_video_device *dev = seq->private;
1311         int status;
1312         int i;
1313         union acpi_object *edid = NULL;
1314
1315
1316         if (!dev)
1317                 goto out;
1318
1319         status = acpi_video_device_EDID(dev, &edid, 128);
1320         if (ACPI_FAILURE(status)) {
1321                 status = acpi_video_device_EDID(dev, &edid, 256);
1322         }
1323
1324         if (ACPI_FAILURE(status)) {
1325                 goto out;
1326         }
1327
1328         if (edid && edid->type == ACPI_TYPE_BUFFER) {
1329                 for (i = 0; i < edid->buffer.length; i++)
1330                         seq_putc(seq, edid->buffer.pointer[i]);
1331         }
1332
1333       out:
1334         if (!edid)
1335                 seq_printf(seq, "<not supported>\n");
1336         else
1337                 kfree(edid);
1338
1339         return 0;
1340 }
1341
1342 static int
1343 acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
1344 {
1345         return single_open(file, acpi_video_device_EDID_seq_show,
1346                            PDE(inode)->data);
1347 }
1348
1349 static int acpi_video_device_add_fs(struct acpi_device *device)
1350 {
1351         struct proc_dir_entry *entry, *device_dir;
1352         struct acpi_video_device *vid_dev;
1353
1354         vid_dev = acpi_driver_data(device);
1355         if (!vid_dev)
1356                 return -ENODEV;
1357
1358         device_dir = proc_mkdir(acpi_device_bid(device),
1359                                 vid_dev->video->dir);
1360         if (!device_dir)
1361                 return -ENOMEM;
1362
1363         /* 'info' [R] */
1364         entry = proc_create_data("info", S_IRUGO, device_dir,
1365                         &acpi_video_device_info_fops, acpi_driver_data(device));
1366         if (!entry)
1367                 goto err_remove_dir;
1368
1369         /* 'state' [R/W] */
1370         entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1371                                  device_dir,
1372                                  &acpi_video_device_state_fops,
1373                                  acpi_driver_data(device));
1374         if (!entry)
1375                 goto err_remove_info;
1376
1377         /* 'brightness' [R/W] */
1378         entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1379                                  device_dir,
1380                                  &acpi_video_device_brightness_fops,
1381                                  acpi_driver_data(device));
1382         if (!entry)
1383                 goto err_remove_state;
1384
1385         /* 'EDID' [R] */
1386         entry = proc_create_data("EDID", S_IRUGO, device_dir,
1387                                  &acpi_video_device_EDID_fops,
1388                                  acpi_driver_data(device));
1389         if (!entry)
1390                 goto err_remove_brightness;
1391
1392         acpi_device_dir(device) = device_dir;
1393
1394         return 0;
1395
1396  err_remove_brightness:
1397         remove_proc_entry("brightness", device_dir);
1398  err_remove_state:
1399         remove_proc_entry("state", device_dir);
1400  err_remove_info:
1401         remove_proc_entry("info", device_dir);
1402  err_remove_dir:
1403         remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1404         return -ENOMEM;
1405 }
1406
1407 static int acpi_video_device_remove_fs(struct acpi_device *device)
1408 {
1409         struct acpi_video_device *vid_dev;
1410         struct proc_dir_entry *device_dir;
1411
1412         vid_dev = acpi_driver_data(device);
1413         if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1414                 return -ENODEV;
1415
1416         device_dir = acpi_device_dir(device);
1417         if (device_dir) {
1418                 remove_proc_entry("info", device_dir);
1419                 remove_proc_entry("state", device_dir);
1420                 remove_proc_entry("brightness", device_dir);
1421                 remove_proc_entry("EDID", device_dir);
1422                 remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
1423                 acpi_device_dir(device) = NULL;
1424         }
1425
1426         return 0;
1427 }
1428
1429 /* video bus */
1430 static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
1431 {
1432         struct acpi_video_bus *video = seq->private;
1433
1434
1435         if (!video)
1436                 goto end;
1437
1438         seq_printf(seq, "Switching heads:              %s\n",
1439                    video->flags.multihead ? "yes" : "no");
1440         seq_printf(seq, "Video ROM:                    %s\n",
1441                    video->flags.rom ? "yes" : "no");
1442         seq_printf(seq, "Device to be POSTed on boot:  %s\n",
1443                    video->flags.post ? "yes" : "no");
1444
1445       end:
1446         return 0;
1447 }
1448
1449 static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
1450 {
1451         return single_open(file, acpi_video_bus_info_seq_show,
1452                            PDE(inode)->data);
1453 }
1454
1455 static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
1456 {
1457         struct acpi_video_bus *video = seq->private;
1458
1459
1460         if (!video)
1461                 goto end;
1462
1463         printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
1464         seq_printf(seq, "<TODO>\n");
1465
1466       end:
1467         return 0;
1468 }
1469
1470 static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
1471 {
1472         return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
1473 }
1474
1475 static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
1476 {
1477         struct acpi_video_bus *video = seq->private;
1478         unsigned long long options;
1479         int status;
1480
1481
1482         if (!video)
1483                 goto end;
1484
1485         status = acpi_video_bus_POST_options(video, &options);
1486         if (ACPI_SUCCESS(status)) {
1487                 if (!(options & 1)) {
1488                         printk(KERN_WARNING PREFIX
1489                                "The motherboard VGA device is not listed as a possible POST device.\n");
1490                         printk(KERN_WARNING PREFIX
1491                                "This indicates a BIOS bug. Please contact the manufacturer.\n");
1492                 }
1493                 printk(KERN_WARNING "%llx\n", options);
1494                 seq_printf(seq, "can POST: <integrated video>");
1495                 if (options & 2)
1496                         seq_printf(seq, " <PCI video>");
1497                 if (options & 4)
1498                         seq_printf(seq, " <AGP video>");
1499                 seq_putc(seq, '\n');
1500         } else
1501                 seq_printf(seq, "<not supported>\n");
1502       end:
1503         return 0;
1504 }
1505
1506 static int
1507 acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
1508 {
1509         return single_open(file, acpi_video_bus_POST_info_seq_show,
1510                            PDE(inode)->data);
1511 }
1512
1513 static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
1514 {
1515         struct acpi_video_bus *video = seq->private;
1516         int status;
1517         unsigned long long id;
1518
1519
1520         if (!video)
1521                 goto end;
1522
1523         status = acpi_video_bus_get_POST(video, &id);
1524         if (!ACPI_SUCCESS(status)) {
1525                 seq_printf(seq, "<not supported>\n");
1526                 goto end;
1527         }
1528         seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
1529
1530       end:
1531         return 0;
1532 }
1533
1534 static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
1535 {
1536         struct acpi_video_bus *video = seq->private;
1537
1538
1539         seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
1540
1541         return 0;
1542 }
1543
1544 static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
1545 {
1546         return single_open(file, acpi_video_bus_POST_seq_show,
1547                            PDE(inode)->data);
1548 }
1549
1550 static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
1551 {
1552         return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
1553 }
1554
1555 static ssize_t
1556 acpi_video_bus_write_POST(struct file *file,
1557                           const char __user * buffer,
1558                           size_t count, loff_t * data)
1559 {
1560         int status;
1561         struct seq_file *m = file->private_data;
1562         struct acpi_video_bus *video = m->private;
1563         char str[12] = { 0 };
1564         unsigned long long opt, options;
1565
1566
1567         if (!video || count >= sizeof(str))
1568                 return -EINVAL;
1569
1570         status = acpi_video_bus_POST_options(video, &options);
1571         if (!ACPI_SUCCESS(status))
1572                 return -EINVAL;
1573
1574         if (copy_from_user(str, buffer, count))
1575                 return -EFAULT;
1576
1577         str[count] = 0;
1578         opt = strtoul(str, NULL, 0);
1579         if (opt > 3)
1580                 return -EFAULT;
1581
1582         /* just in case an OEM 'forgot' the motherboard... */
1583         options |= 1;
1584
1585         if (options & (1ul << opt)) {
1586                 status = acpi_video_bus_set_POST(video, opt);
1587                 if (!ACPI_SUCCESS(status))
1588                         return -EFAULT;
1589
1590         }
1591
1592         return count;
1593 }
1594
1595 static ssize_t
1596 acpi_video_bus_write_DOS(struct file *file,
1597                          const char __user * buffer,
1598                          size_t count, loff_t * data)
1599 {
1600         int status;
1601         struct seq_file *m = file->private_data;
1602         struct acpi_video_bus *video = m->private;
1603         char str[12] = { 0 };
1604         unsigned long opt;
1605
1606
1607         if (!video || count >= sizeof(str))
1608                 return -EINVAL;
1609
1610         if (copy_from_user(str, buffer, count))
1611                 return -EFAULT;
1612
1613         str[count] = 0;
1614         opt = strtoul(str, NULL, 0);
1615         if (opt > 7)
1616                 return -EFAULT;
1617
1618         status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
1619
1620         if (!ACPI_SUCCESS(status))
1621                 return -EFAULT;
1622
1623         return count;
1624 }
1625
1626 static int acpi_video_bus_add_fs(struct acpi_device *device)
1627 {
1628         struct acpi_video_bus *video = acpi_driver_data(device);
1629         struct proc_dir_entry *device_dir;
1630         struct proc_dir_entry *entry;
1631
1632         device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
1633         if (!device_dir)
1634                 return -ENOMEM;
1635
1636         /* 'info' [R] */
1637         entry = proc_create_data("info", S_IRUGO, device_dir,
1638                                  &acpi_video_bus_info_fops,
1639                                  acpi_driver_data(device));
1640         if (!entry)
1641                 goto err_remove_dir;
1642
1643         /* 'ROM' [R] */
1644         entry = proc_create_data("ROM", S_IRUGO, device_dir,
1645                                  &acpi_video_bus_ROM_fops,
1646                                  acpi_driver_data(device));
1647         if (!entry)
1648                 goto err_remove_info;
1649
1650         /* 'POST_info' [R] */
1651         entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1652                                  &acpi_video_bus_POST_info_fops,
1653                                  acpi_driver_data(device));
1654         if (!entry)
1655                 goto err_remove_rom;
1656
1657         /* 'POST' [R/W] */
1658         entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1659                                  device_dir,
1660                                  &acpi_video_bus_POST_fops,
1661                                  acpi_driver_data(device));
1662         if (!entry)
1663                 goto err_remove_post_info;
1664
1665         /* 'DOS' [R/W] */
1666         entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1667                                  device_dir,
1668                                  &acpi_video_bus_DOS_fops,
1669                                  acpi_driver_data(device));
1670         if (!entry)
1671                 goto err_remove_post;
1672
1673         video->dir = acpi_device_dir(device) = device_dir;
1674         return 0;
1675
1676  err_remove_post:
1677         remove_proc_entry("POST", device_dir);
1678  err_remove_post_info:
1679         remove_proc_entry("POST_info", device_dir);
1680  err_remove_rom:
1681         remove_proc_entry("ROM", device_dir);
1682  err_remove_info:
1683         remove_proc_entry("info", device_dir);
1684  err_remove_dir:
1685         remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1686         return -ENOMEM;
1687 }
1688
1689 static int acpi_video_bus_remove_fs(struct acpi_device *device)
1690 {
1691         struct proc_dir_entry *device_dir = acpi_device_dir(device);
1692
1693         if (device_dir) {
1694                 remove_proc_entry("info", device_dir);
1695                 remove_proc_entry("ROM", device_dir);
1696                 remove_proc_entry("POST_info", device_dir);
1697                 remove_proc_entry("POST", device_dir);
1698                 remove_proc_entry("DOS", device_dir);
1699                 remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
1700                 acpi_device_dir(device) = NULL;
1701         }
1702
1703         return 0;
1704 }
1705
1706 /* --------------------------------------------------------------------------
1707                                  Driver Interface
1708    -------------------------------------------------------------------------- */
1709
1710 /* device interface */
1711 static struct acpi_video_device_attrib*
1712 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1713 {
1714         struct acpi_video_enumerated_device *ids;
1715         int i;
1716
1717         for (i = 0; i < video->attached_count; i++) {
1718                 ids = &video->attached_array[i];
1719                 if ((ids->value.int_val & 0xffff) == device_id)
1720                         return &ids->value.attrib;
1721         }
1722
1723         return NULL;
1724 }
1725
1726 static int
1727 acpi_video_bus_get_one_device(struct acpi_device *device,
1728                               struct acpi_video_bus *video)
1729 {
1730         unsigned long long device_id;
1731         int status;
1732         struct acpi_video_device *data;
1733         struct acpi_video_device_attrib* attribute;
1734
1735         if (!device || !video)
1736                 return -EINVAL;
1737
1738         status =
1739             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1740         if (ACPI_SUCCESS(status)) {
1741
1742                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1743                 if (!data)
1744                         return -ENOMEM;
1745
1746                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1747                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1748                 device->driver_data = data;
1749
1750                 data->device_id = device_id;
1751                 data->video = video;
1752                 data->dev = device;
1753
1754                 attribute = acpi_video_get_device_attr(video, device_id);
1755
1756                 if((attribute != NULL) && attribute->device_id_scheme) {
1757                         switch (attribute->display_type) {
1758                         case ACPI_VIDEO_DISPLAY_CRT:
1759                                 data->flags.crt = 1;
1760                                 break;
1761                         case ACPI_VIDEO_DISPLAY_TV:
1762                                 data->flags.tvout = 1;
1763                                 break;
1764                         case ACPI_VIDEO_DISPLAY_DVI:
1765                                 data->flags.dvi = 1;
1766                                 break;
1767                         case ACPI_VIDEO_DISPLAY_LCD:
1768                                 data->flags.lcd = 1;
1769                                 break;
1770                         default:
1771                                 data->flags.unknown = 1;
1772                                 break;
1773                         }
1774                         if(attribute->bios_can_detect)
1775                                 data->flags.bios = 1;
1776                 } else
1777                         data->flags.unknown = 1;
1778
1779                 acpi_video_device_bind(video, data);
1780                 acpi_video_device_find_cap(data);
1781
1782                 status = acpi_install_notify_handler(device->handle,
1783                                                      ACPI_DEVICE_NOTIFY,
1784                                                      acpi_video_device_notify,
1785                                                      data);
1786                 if (ACPI_FAILURE(status)) {
1787                         printk(KERN_ERR PREFIX
1788                                           "Error installing notify handler\n");
1789                         if(data->brightness)
1790                                 kfree(data->brightness->levels);
1791                         kfree(data->brightness);
1792                         kfree(data);
1793                         return -ENODEV;
1794                 }
1795
1796                 mutex_lock(&video->device_list_lock);
1797                 list_add_tail(&data->entry, &video->video_device_list);
1798                 mutex_unlock(&video->device_list_lock);
1799
1800                 acpi_video_device_add_fs(device);
1801
1802                 return 0;
1803         }
1804
1805         return -ENOENT;
1806 }
1807
1808 /*
1809  *  Arg:
1810  *      video   : video bus device
1811  *
1812  *  Return:
1813  *      none
1814  *
1815  *  Enumerate the video device list of the video bus,
1816  *  bind the ids with the corresponding video devices
1817  *  under the video bus.
1818  */
1819
1820 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1821 {
1822         struct acpi_video_device *dev;
1823
1824         mutex_lock(&video->device_list_lock);
1825
1826         list_for_each_entry(dev, &video->video_device_list, entry)
1827                 acpi_video_device_bind(video, dev);
1828
1829         mutex_unlock(&video->device_list_lock);
1830 }
1831
1832 /*
1833  *  Arg:
1834  *      video   : video bus device
1835  *      device  : video output device under the video
1836  *              bus
1837  *
1838  *  Return:
1839  *      none
1840  *
1841  *  Bind the ids with the corresponding video devices
1842  *  under the video bus.
1843  */
1844
1845 static void
1846 acpi_video_device_bind(struct acpi_video_bus *video,
1847                        struct acpi_video_device *device)
1848 {
1849         struct acpi_video_enumerated_device *ids;
1850         int i;
1851
1852         for (i = 0; i < video->attached_count; i++) {
1853                 ids = &video->attached_array[i];
1854                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1855                         ids->bind_info = device;
1856                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1857                 }
1858         }
1859 }
1860
1861 /*
1862  *  Arg:
1863  *      video   : video bus device
1864  *
1865  *  Return:
1866  *      < 0     : error
1867  *
1868  *  Call _DOD to enumerate all devices attached to display adapter
1869  *
1870  */
1871
1872 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1873 {
1874         int status;
1875         int count;
1876         int i;
1877         struct acpi_video_enumerated_device *active_list;
1878         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1879         union acpi_object *dod = NULL;
1880         union acpi_object *obj;
1881
1882         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1883         if (!ACPI_SUCCESS(status)) {
1884                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1885                 return status;
1886         }
1887
1888         dod = buffer.pointer;
1889         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1890                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1891                 status = -EFAULT;
1892                 goto out;
1893         }
1894
1895         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1896                           dod->package.count));
1897
1898         active_list = kcalloc(1 + dod->package.count,
1899                               sizeof(struct acpi_video_enumerated_device),
1900                               GFP_KERNEL);
1901         if (!active_list) {
1902                 status = -ENOMEM;
1903                 goto out;
1904         }
1905
1906         count = 0;
1907         for (i = 0; i < dod->package.count; i++) {
1908                 obj = &dod->package.elements[i];
1909
1910                 if (obj->type != ACPI_TYPE_INTEGER) {
1911                         printk(KERN_ERR PREFIX
1912                                 "Invalid _DOD data in element %d\n", i);
1913                         continue;
1914                 }
1915
1916                 active_list[count].value.int_val = obj->integer.value;
1917                 active_list[count].bind_info = NULL;
1918                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1919                                   (int)obj->integer.value));
1920                 count++;
1921         }
1922
1923         kfree(video->attached_array);
1924
1925         video->attached_array = active_list;
1926         video->attached_count = count;
1927
1928  out:
1929         kfree(buffer.pointer);
1930         return status;
1931 }
1932
1933 static int
1934 acpi_video_get_next_level(struct acpi_video_device *device,
1935                           u32 level_current, u32 event)
1936 {
1937         int min, max, min_above, max_below, i, l, delta = 255;
1938         max = max_below = 0;
1939         min = min_above = 255;
1940         /* Find closest level to level_current */
1941         for (i = 2; i < device->brightness->count; i++) {
1942                 l = device->brightness->levels[i];
1943                 if (abs(l - level_current) < abs(delta)) {
1944                         delta = l - level_current;
1945                         if (!delta)
1946                                 break;
1947                 }
1948         }
1949         /* Ajust level_current to closest available level */
1950         level_current += delta;
1951         for (i = 2; i < device->brightness->count; i++) {
1952                 l = device->brightness->levels[i];
1953                 if (l < min)
1954                         min = l;
1955                 if (l > max)
1956                         max = l;
1957                 if (l < min_above && l > level_current)
1958                         min_above = l;
1959                 if (l > max_below && l < level_current)
1960                         max_below = l;
1961         }
1962
1963         switch (event) {
1964         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1965                 return (level_current < max) ? min_above : min;
1966         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1967                 return (level_current < max) ? min_above : max;
1968         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1969                 return (level_current > min) ? max_below : min;
1970         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1971         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1972                 return 0;
1973         default:
1974                 return level_current;
1975         }
1976 }
1977
1978 static int
1979 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1980 {
1981         unsigned long long level_current, level_next;
1982         int result = -EINVAL;
1983
1984         /* no warning message if acpi_backlight=vendor is used */
1985         if (!acpi_video_backlight_support())
1986                 return 0;
1987
1988         if (!device->brightness)
1989                 goto out;
1990
1991         result = acpi_video_device_lcd_get_level_current(device,
1992                                                          &level_current);
1993         if (result)
1994                 goto out;
1995
1996         level_next = acpi_video_get_next_level(device, level_current, event);
1997
1998         result = acpi_video_device_lcd_set_level(device, level_next);
1999
2000         if (!result)
2001                 backlight_force_update(device->backlight,
2002                                        BACKLIGHT_UPDATE_HOTKEY);
2003
2004 out:
2005         if (result)
2006                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
2007
2008         return result;
2009 }
2010
2011 static int
2012 acpi_video_bus_get_devices(struct acpi_video_bus *video,
2013                            struct acpi_device *device)
2014 {
2015         int status = 0;
2016         struct acpi_device *dev;
2017
2018         acpi_video_device_enumerate(video);
2019
2020         list_for_each_entry(dev, &device->children, node) {
2021
2022                 status = acpi_video_bus_get_one_device(dev, video);
2023                 if (ACPI_FAILURE(status)) {
2024                         printk(KERN_WARNING PREFIX
2025                                         "Cant attach device");
2026                         continue;
2027                 }
2028         }
2029         return status;
2030 }
2031
2032 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
2033 {
2034         acpi_status status;
2035         struct acpi_video_bus *video;
2036
2037
2038         if (!device || !device->video)
2039                 return -ENOENT;
2040
2041         video = device->video;
2042
2043         acpi_video_device_remove_fs(device->dev);
2044
2045         status = acpi_remove_notify_handler(device->dev->handle,
2046                                             ACPI_DEVICE_NOTIFY,
2047                                             acpi_video_device_notify);
2048         if (device->backlight) {
2049                 sysfs_remove_link(&device->backlight->dev.kobj, "device");
2050                 backlight_device_unregister(device->backlight);
2051                 device->backlight = NULL;
2052         }
2053         if (device->cooling_dev) {
2054                 sysfs_remove_link(&device->dev->dev.kobj,
2055                                   "thermal_cooling");
2056                 sysfs_remove_link(&device->cooling_dev->device.kobj,
2057                                   "device");
2058                 thermal_cooling_device_unregister(device->cooling_dev);
2059                 device->cooling_dev = NULL;
2060         }
2061         video_output_unregister(device->output_dev);
2062
2063         return 0;
2064 }
2065
2066 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2067 {
2068         int status;
2069         struct acpi_video_device *dev, *next;
2070
2071         mutex_lock(&video->device_list_lock);
2072
2073         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2074
2075                 status = acpi_video_bus_put_one_device(dev);
2076                 if (ACPI_FAILURE(status))
2077                         printk(KERN_WARNING PREFIX
2078                                "hhuuhhuu bug in acpi video driver.\n");
2079
2080                 if (dev->brightness) {
2081                         kfree(dev->brightness->levels);
2082                         kfree(dev->brightness);
2083                 }
2084                 list_del(&dev->entry);
2085                 kfree(dev);
2086         }
2087
2088         mutex_unlock(&video->device_list_lock);
2089
2090         return 0;
2091 }
2092
2093 /* acpi_video interface */
2094
2095 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
2096 {
2097         return acpi_video_bus_DOS(video, 0, 0);
2098 }
2099
2100 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
2101 {
2102         return acpi_video_bus_DOS(video, 0, 1);
2103 }
2104
2105 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
2106 {
2107         struct acpi_video_bus *video = acpi_driver_data(device);
2108         struct input_dev *input;
2109         int keycode;
2110
2111         if (!video)
2112                 return;
2113
2114         input = video->input;
2115
2116         switch (event) {
2117         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
2118                                          * most likely via hotkey. */
2119                 acpi_bus_generate_proc_event(device, event, 0);
2120                 keycode = KEY_SWITCHVIDEOMODE;
2121                 break;
2122
2123         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
2124                                          * connector. */
2125                 acpi_video_device_enumerate(video);
2126                 acpi_video_device_rebind(video);
2127                 acpi_bus_generate_proc_event(device, event, 0);
2128                 keycode = KEY_SWITCHVIDEOMODE;
2129                 break;
2130
2131         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
2132                 acpi_bus_generate_proc_event(device, event, 0);
2133                 keycode = KEY_SWITCHVIDEOMODE;
2134                 break;
2135         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
2136                 acpi_bus_generate_proc_event(device, event, 0);
2137                 keycode = KEY_VIDEO_NEXT;
2138                 break;
2139         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
2140                 acpi_bus_generate_proc_event(device, event, 0);
2141                 keycode = KEY_VIDEO_PREV;
2142                 break;
2143
2144         default:
2145                 keycode = KEY_UNKNOWN;
2146                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2147                                   "Unsupported event [0x%x]\n", event));
2148                 break;
2149         }
2150
2151         acpi_notifier_call_chain(device, event, 0);
2152         input_report_key(input, keycode, 1);
2153         input_sync(input);
2154         input_report_key(input, keycode, 0);
2155         input_sync(input);
2156
2157         return;
2158 }
2159
2160 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
2161 {
2162         struct acpi_video_device *video_device = data;
2163         struct acpi_device *device = NULL;
2164         struct acpi_video_bus *bus;
2165         struct input_dev *input;
2166         int keycode;
2167
2168         if (!video_device)
2169                 return;
2170
2171         device = video_device->dev;
2172         bus = video_device->video;
2173         input = bus->input;
2174
2175         switch (event) {
2176         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
2177                 if (brightness_switch_enabled)
2178                         acpi_video_switch_brightness(video_device, event);
2179                 acpi_bus_generate_proc_event(device, event, 0);
2180                 keycode = KEY_BRIGHTNESS_CYCLE;
2181                 break;
2182         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
2183                 if (brightness_switch_enabled)
2184                         acpi_video_switch_brightness(video_device, event);
2185                 acpi_bus_generate_proc_event(device, event, 0);
2186                 keycode = KEY_BRIGHTNESSUP;
2187                 break;
2188         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
2189                 if (brightness_switch_enabled)
2190                         acpi_video_switch_brightness(video_device, event);
2191                 acpi_bus_generate_proc_event(device, event, 0);
2192                 keycode = KEY_BRIGHTNESSDOWN;
2193                 break;
2194         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
2195                 if (brightness_switch_enabled)
2196                         acpi_video_switch_brightness(video_device, event);
2197                 acpi_bus_generate_proc_event(device, event, 0);
2198                 keycode = KEY_BRIGHTNESS_ZERO;
2199                 break;
2200         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
2201                 if (brightness_switch_enabled)
2202                         acpi_video_switch_brightness(video_device, event);
2203                 acpi_bus_generate_proc_event(device, event, 0);
2204                 keycode = KEY_DISPLAY_OFF;
2205                 break;
2206         default:
2207                 keycode = KEY_UNKNOWN;
2208                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
2209                                   "Unsupported event [0x%x]\n", event));
2210                 break;
2211         }
2212
2213         acpi_notifier_call_chain(device, event, 0);
2214         input_report_key(input, keycode, 1);
2215         input_sync(input);
2216         input_report_key(input, keycode, 0);
2217         input_sync(input);
2218
2219         return;
2220 }
2221
2222 static int instance;
2223 static int acpi_video_resume(struct acpi_device *device)
2224 {
2225         struct acpi_video_bus *video;
2226         struct acpi_video_device *video_device;
2227         int i;
2228
2229         if (!device || !acpi_driver_data(device))
2230                 return -EINVAL;
2231
2232         video = acpi_driver_data(device);
2233
2234         for (i = 0; i < video->attached_count; i++) {
2235                 video_device = video->attached_array[i].bind_info;
2236                 if (video_device && video_device->backlight)
2237                         acpi_video_set_brightness(video_device->backlight);
2238         }
2239         return AE_OK;
2240 }
2241
2242 static int acpi_video_bus_add(struct acpi_device *device)
2243 {
2244         struct acpi_video_bus *video;
2245         struct input_dev *input;
2246         int error;
2247
2248         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2249         if (!video)
2250                 return -ENOMEM;
2251
2252         /* a hack to fix the duplicate name "VID" problem on T61 */
2253         if (!strcmp(device->pnp.bus_id, "VID")) {
2254                 if (instance)
2255                         device->pnp.bus_id[3] = '0' + instance;
2256                 instance ++;
2257         }
2258         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2259         if (!strcmp(device->pnp.bus_id, "VGA")) {
2260                 if (instance)
2261                         device->pnp.bus_id[3] = '0' + instance;
2262                 instance++;
2263         }
2264
2265         video->device = device;
2266         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2267         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2268         device->driver_data = video;
2269
2270         acpi_video_bus_find_cap(video);
2271         error = acpi_video_bus_check(video);
2272         if (error)
2273                 goto err_free_video;
2274
2275         error = acpi_video_bus_add_fs(device);
2276         if (error)
2277                 goto err_free_video;
2278
2279         mutex_init(&video->device_list_lock);
2280         INIT_LIST_HEAD(&video->video_device_list);
2281
2282         acpi_video_bus_get_devices(video, device);
2283         acpi_video_bus_start_devices(video);
2284
2285         video->input = input = input_allocate_device();
2286         if (!input) {
2287                 error = -ENOMEM;
2288                 goto err_stop_video;
2289         }
2290
2291         snprintf(video->phys, sizeof(video->phys),
2292                 "%s/video/input0", acpi_device_hid(video->device));
2293
2294         input->name = acpi_device_name(video->device);
2295         input->phys = video->phys;
2296         input->id.bustype = BUS_HOST;
2297         input->id.product = 0x06;
2298         input->dev.parent = &device->dev;
2299         input->evbit[0] = BIT(EV_KEY);
2300         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2301         set_bit(KEY_VIDEO_NEXT, input->keybit);
2302         set_bit(KEY_VIDEO_PREV, input->keybit);
2303         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2304         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2305         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2306         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2307         set_bit(KEY_DISPLAY_OFF, input->keybit);
2308         set_bit(KEY_UNKNOWN, input->keybit);
2309
2310         error = input_register_device(input);
2311         if (error)
2312                 goto err_free_input_dev;
2313
2314         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2315                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2316                video->flags.multihead ? "yes" : "no",
2317                video->flags.rom ? "yes" : "no",
2318                video->flags.post ? "yes" : "no");
2319
2320         return 0;
2321
2322  err_free_input_dev:
2323         input_free_device(input);
2324  err_stop_video:
2325         acpi_video_bus_stop_devices(video);
2326         acpi_video_bus_put_devices(video);
2327         kfree(video->attached_array);
2328         acpi_video_bus_remove_fs(device);
2329  err_free_video:
2330         kfree(video);
2331         device->driver_data = NULL;
2332
2333         return error;
2334 }
2335
2336 static int acpi_video_bus_remove(struct acpi_device *device, int type)
2337 {
2338         struct acpi_video_bus *video = NULL;
2339
2340
2341         if (!device || !acpi_driver_data(device))
2342                 return -EINVAL;
2343
2344         video = acpi_driver_data(device);
2345
2346         acpi_video_bus_stop_devices(video);
2347         acpi_video_bus_put_devices(video);
2348         acpi_video_bus_remove_fs(device);
2349
2350         input_unregister_device(video->input);
2351         kfree(video->attached_array);
2352         kfree(video);
2353
2354         return 0;
2355 }
2356
2357 static int __init intel_opregion_present(void)
2358 {
2359 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
2360         struct pci_dev *dev = NULL;
2361         u32 address;
2362
2363         for_each_pci_dev(dev) {
2364                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2365                         continue;
2366                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2367                         continue;
2368                 pci_read_config_dword(dev, 0xfc, &address);
2369                 if (!address)
2370                         continue;
2371                 return 1;
2372         }
2373 #endif
2374         return 0;
2375 }
2376
2377 int acpi_video_register(void)
2378 {
2379         int result = 0;
2380         if (register_count) {
2381                 /*
2382                  * if the function of acpi_video_register is already called,
2383                  * don't register the acpi_vide_bus again and return no error.
2384                  */
2385                 return 0;
2386         }
2387
2388         acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
2389         if (!acpi_video_dir)
2390                 return -ENODEV;
2391
2392         result = acpi_bus_register_driver(&acpi_video_bus);
2393         if (result < 0) {
2394                 remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2395                 return -ENODEV;
2396         }
2397
2398         /*
2399          * When the acpi_video_bus is loaded successfully, increase
2400          * the counter reference.
2401          */
2402         register_count = 1;
2403
2404         return 0;
2405 }
2406 EXPORT_SYMBOL(acpi_video_register);
2407
2408 void acpi_video_unregister(void)
2409 {
2410         if (!register_count) {
2411                 /*
2412                  * If the acpi video bus is already unloaded, don't
2413                  * unload it again and return directly.
2414                  */
2415                 return;
2416         }
2417         acpi_bus_unregister_driver(&acpi_video_bus);
2418
2419         remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2420
2421         register_count = 0;
2422
2423         return;
2424 }
2425 EXPORT_SYMBOL(acpi_video_unregister);
2426
2427 /*
2428  * This is kind of nasty. Hardware using Intel chipsets may require
2429  * the video opregion code to be run first in order to initialise
2430  * state before any ACPI video calls are made. To handle this we defer
2431  * registration of the video class until the opregion code has run.
2432  */
2433
2434 static int __init acpi_video_init(void)
2435 {
2436         dmi_check_system(video_dmi_table);
2437
2438         if (intel_opregion_present())
2439                 return 0;
2440
2441         return acpi_video_register();
2442 }
2443
2444 static void __exit acpi_video_exit(void)
2445 {
2446         acpi_video_unregister();
2447
2448         return;
2449 }
2450
2451 module_init(acpi_video_init);
2452 module_exit(acpi_video_exit);