drivers/acpi/video.c

   1 /*
   2  *  video.c - ACPI Video Driver
   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/input.h>
  34 #include <linux/backlight.h>
  35 #include <linux/thermal.h>
  36 #include <linux/sort.h>
  37 #include <linux/pci.h>
  38 #include <linux/pci_ids.h>
  39 #include <linux/slab.h>
  40 #include <linux/dmi.h>
  41 #include <linux/suspend.h>
  42 #include <linux/acpi.h>
  43 #include <acpi/video.h>
  44 #include <asm/uaccess.h>
  45
  46 #include "internal.h"
  47
  48 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  49 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  50 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  51 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  52 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  53 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  54 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  55
  56 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  57 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  58 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  59 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  60 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  61
  62 #define MAX_NAME_LEN    20
  63
  64 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  65 ACPI_MODULE_NAME("video");
  66
  67 MODULE_AUTHOR("Bruno Ducrot");
  68 MODULE_DESCRIPTION("ACPI Video Driver");
  69 MODULE_LICENSE("GPL");
  70
  71 static bool brightness_switch_enabled;
  72 module_param(brightness_switch_enabled, bool, 0644);
  73
  74 /*
  75  * By default, we don't allow duplicate ACPI video bus devices
  76  * under the same VGA controller
  77  */
  78 static bool allow_duplicates;
  79 module_param(allow_duplicates, bool, 0644);
  80
  81 /*
  82  * For Windows 8 systems: used to decide if video module
  83  * should skip registering backlight interface of its own.
  84  */
  85 static int use_native_backlight_param = 1;
  86 module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
  87 static bool use_native_backlight_dmi = false;
  88
  89 static int register_count;
  90 static struct mutex video_list_lock;
  91 static struct list_head video_bus_head;
  92 static int acpi_video_bus_add(struct acpi_device *device);
  93 static int acpi_video_bus_remove(struct acpi_device *device);
  94 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  95
  96 static const struct acpi_device_id video_device_ids[] = {
  97         {ACPI_VIDEO_HID, 0},
  98         {"", 0},
  99 };
 100 MODULE_DEVICE_TABLE(acpi, video_device_ids);
 101
 102 static struct acpi_driver acpi_video_bus = {
 103         .name = "video",
 104         .class = ACPI_VIDEO_CLASS,
 105         .ids = video_device_ids,
 106         .ops = {
 107                 .add = acpi_video_bus_add,
 108                 .remove = acpi_video_bus_remove,
 109                 .notify = acpi_video_bus_notify,
 110                 },
 111 };
 112
 113 struct acpi_video_bus_flags {
 114         u8 multihead:1;         /* can switch video heads */
 115         u8 rom:1;               /* can retrieve a video rom */
 116         u8 post:1;              /* can configure the head to */
 117         u8 reserved:5;
 118 };
 119
 120 struct acpi_video_bus_cap {
 121         u8 _DOS:1;              /* Enable/Disable output switching */
 122         u8 _DOD:1;              /* Enumerate all devices attached to display adapter */
 123         u8 _ROM:1;              /* Get ROM Data */
 124         u8 _GPD:1;              /* Get POST Device */
 125         u8 _SPD:1;              /* Set POST Device */
 126         u8 _VPO:1;              /* Video POST Options */
 127         u8 reserved:2;
 128 };
 129
 130 struct acpi_video_device_attrib {
 131         u32 display_index:4;    /* A zero-based instance of the Display */
 132         u32 display_port_attachment:4;  /* This field differentiates the display type */
 133         u32 display_type:4;     /* Describe the specific type in use */
 134         u32 vendor_specific:4;  /* Chipset Vendor Specific */
 135         u32 bios_can_detect:1;  /* BIOS can detect the device */
 136         u32 depend_on_vga:1;    /* Non-VGA output device whose power is related to
 137                                    the VGA device. */
 138         u32 pipe_id:3;          /* For VGA multiple-head devices. */
 139         u32 reserved:10;        /* Must be 0 */
 140         u32 device_id_scheme:1; /* Device ID Scheme */
 141 };
 142
 143 struct acpi_video_enumerated_device {
 144         union {
 145                 u32 int_val;
 146                 struct acpi_video_device_attrib attrib;
 147         } value;
 148         struct acpi_video_device *bind_info;
 149 };
 150
 151 struct acpi_video_bus {
 152         struct acpi_device *device;
 153         bool backlight_registered;
 154         bool backlight_notifier_registered;
 155         u8 dos_setting;
 156         struct acpi_video_enumerated_device *attached_array;
 157         u8 attached_count;
 158         struct acpi_video_bus_cap cap;
 159         struct acpi_video_bus_flags flags;
 160         struct list_head video_device_list;
 161         struct mutex device_list_lock;  /* protects video_device_list */
 162         struct list_head entry;
 163         struct input_dev *input;
 164         char phys[32];  /* for input device */
 165         struct notifier_block pm_nb;
 166         struct notifier_block backlight_nb;
 167 };
 168
 169 struct acpi_video_device_flags {
 170         u8 crt:1;
 171         u8 lcd:1;
 172         u8 tvout:1;
 173         u8 dvi:1;
 174         u8 bios:1;
 175         u8 unknown:1;
 176         u8 notify:1;
 177         u8 reserved:1;
 178 };
 179
 180 struct acpi_video_device_cap {
 181         u8 _ADR:1;              /* Return the unique ID */
 182         u8 _BCL:1;              /* Query list of brightness control levels supported */
 183         u8 _BCM:1;              /* Set the brightness level */
 184         u8 _BQC:1;              /* Get current brightness level */
 185         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 186         u8 _DDC:1;              /* Return the EDID for this device */
 187 };
 188
 189 struct acpi_video_brightness_flags {
 190         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 191         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order */
 192         u8 _BQC_use_index:1;            /* _BQC returns an index value */
 193 };
 194
 195 struct acpi_video_device_brightness {
 196         int curr;
 197         int count;
 198         int *levels;
 199         struct acpi_video_brightness_flags flags;
 200 };
 201
 202 struct acpi_video_device {
 203         unsigned long device_id;
 204         struct acpi_video_device_flags flags;
 205         struct acpi_video_device_cap cap;
 206         struct list_head entry;
 207         struct acpi_video_bus *video;
 208         struct acpi_device *dev;
 209         struct acpi_video_device_brightness *brightness;
 210         struct backlight_device *backlight;
 211         struct thermal_cooling_device *cooling_dev;
 212 };
 213
 214 static const char device_decode[][30] = {
 215         "motherboard VGA device",
 216         "PCI VGA device",
 217         "AGP VGA device",
 218         "UNKNOWN",
 219 };
 220
 221 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 222 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 223 static void acpi_video_device_bind(struct acpi_video_bus *video,
 224                                    struct acpi_video_device *device);
 225 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 226 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 227                         int level);
 228 static int acpi_video_device_lcd_get_level_current(
 229                         struct acpi_video_device *device,
 230                         unsigned long long *level, bool raw);
 231 static int acpi_video_get_next_level(struct acpi_video_device *device,
 232                                      u32 level_current, u32 event);
 233 static int acpi_video_switch_brightness(struct acpi_video_device *device,
 234                                          int event);
 235
 236 static bool acpi_video_use_native_backlight(void)
 237 {
 238         if (use_native_backlight_param != -1)
 239                 return use_native_backlight_param;
 240         else
 241                 return use_native_backlight_dmi;
 242 }
 243
 244 static bool acpi_video_verify_backlight_support(void)
 245 {
 246         if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
 247             backlight_device_registered(BACKLIGHT_RAW))
 248                 return false;
 249         return acpi_video_backlight_support();
 250 }
 251
 252 /* backlight device sysfs support */
 253 static int acpi_video_get_brightness(struct backlight_device *bd)
 254 {
 255         unsigned long long cur_level;
 256         int i;
 257         struct acpi_video_device *vd = bl_get_data(bd);
 258
 259         if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
 260                 return -EINVAL;
 261         for (i = 2; i < vd->brightness->count; i++) {
 262                 if (vd->brightness->levels[i] == cur_level)
 263                         /*
 264                          * The first two entries are special - see page 575
 265                          * of the ACPI spec 3.0
 266                          */
 267                         return i - 2;
 268         }
 269         return 0;
 270 }
 271
 272 static int acpi_video_set_brightness(struct backlight_device *bd)
 273 {
 274         int request_level = bd->props.brightness + 2;
 275         struct acpi_video_device *vd = bl_get_data(bd);
 276
 277         return acpi_video_device_lcd_set_level(vd,
 278                                 vd->brightness->levels[request_level]);
 279 }
 280
 281 static const struct backlight_ops acpi_backlight_ops = {
 282         .get_brightness = acpi_video_get_brightness,
 283         .update_status  = acpi_video_set_brightness,
 284 };
 285
 286 /* thermal cooling device callbacks */
 287 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
 288                                long *state)
 289 {
 290         struct acpi_device *device = cooling_dev->devdata;
 291         struct acpi_video_device *video = acpi_driver_data(device);
 292
 293         *state = video->brightness->count - 3;
 294         return 0;
 295 }
 296
 297 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
 298                                long *state)
 299 {
 300         struct acpi_device *device = cooling_dev->devdata;
 301         struct acpi_video_device *video = acpi_driver_data(device);
 302         unsigned long long level;
 303         int offset;
 304
 305         if (acpi_video_device_lcd_get_level_current(video, &level, false))
 306                 return -EINVAL;
 307         for (offset = 2; offset < video->brightness->count; offset++)
 308                 if (level == video->brightness->levels[offset]) {
 309                         *state = video->brightness->count - offset - 1;
 310                         return 0;
 311                 }
 312
 313         return -EINVAL;
 314 }
 315
 316 static int
 317 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
 318 {
 319         struct acpi_device *device = cooling_dev->devdata;
 320         struct acpi_video_device *video = acpi_driver_data(device);
 321         int level;
 322
 323         if (state >= video->brightness->count - 2)
 324                 return -EINVAL;
 325
 326         state = video->brightness->count - state;
 327         level = video->brightness->levels[state - 1];
 328         return acpi_video_device_lcd_set_level(video, level);
 329 }
 330
 331 static const struct thermal_cooling_device_ops video_cooling_ops = {
 332         .get_max_state = video_get_max_state,
 333         .get_cur_state = video_get_cur_state,
 334         .set_cur_state = video_set_cur_state,
 335 };
 336
 337 /*
 338  * --------------------------------------------------------------------------
 339  *                             Video Management
 340  * --------------------------------------------------------------------------
 341  */
 342
 343 static int
 344 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 345                                    union acpi_object **levels)
 346 {
 347         int status;
 348         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 349         union acpi_object *obj;
 350
 351
 352         *levels = NULL;
 353
 354         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 355         if (!ACPI_SUCCESS(status))
 356                 return status;
 357         obj = (union acpi_object *)buffer.pointer;
 358         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 359                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 360                 status = -EFAULT;
 361                 goto err;
 362         }
 363
 364         *levels = obj;
 365
 366         return 0;
 367
 368 err:
 369         kfree(buffer.pointer);
 370
 371         return status;
 372 }
 373
 374 static int
 375 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 376 {
 377         int status;
 378         int state;
 379
 380         status = acpi_execute_simple_method(device->dev->handle,
 381                                             "_BCM", level);
 382         if (ACPI_FAILURE(status)) {
 383                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 384                 return -EIO;
 385         }
 386
 387         device->brightness->curr = level;
 388         for (state = 2; state < device->brightness->count; state++)
 389                 if (level == device->brightness->levels[state]) {
 390                         if (device->backlight)
 391                                 device->backlight->props.brightness = state - 2;
 392                         return 0;
 393                 }
 394
 395         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 396         return -EINVAL;
 397 }
 398
 399 /*
 400  * For some buggy _BQC methods, we need to add a constant value to
 401  * the _BQC return value to get the actual current brightness level
 402  */
 403
 404 static int bqc_offset_aml_bug_workaround;
 405 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 406 {
 407         bqc_offset_aml_bug_workaround = 9;
 408         return 0;
 409 }
 410
 411 static int __init video_set_use_native_backlight(const struct dmi_system_id *d)
 412 {
 413         use_native_backlight_dmi = true;
 414         return 0;
 415 }
 416
 417 static struct dmi_system_id video_dmi_table[] __initdata = {
 418         /*
 419          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 420          */
 421         {
 422          .callback = video_set_bqc_offset,
 423          .ident = "Acer Aspire 5720",
 424          .matches = {
 425                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 426                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 427                 },
 428         },
 429         {
 430          .callback = video_set_bqc_offset,
 431          .ident = "Acer Aspire 5710Z",
 432          .matches = {
 433                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 434                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 435                 },
 436         },
 437         {
 438          .callback = video_set_bqc_offset,
 439          .ident = "eMachines E510",
 440          .matches = {
 441                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 442                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 443                 },
 444         },
 445         {
 446          .callback = video_set_bqc_offset,
 447          .ident = "Acer Aspire 5315",
 448          .matches = {
 449                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 450                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 451                 },
 452         },
 453         {
 454          .callback = video_set_bqc_offset,
 455          .ident = "Acer Aspire 7720",
 456          .matches = {
 457                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 458                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
 459                 },
 460         },
 461         {
 462          .callback = video_set_use_native_backlight,
 463          .ident = "ThinkPad T430 and T430s",
 464          .matches = {
 465                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 466                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T430"),
 467                 },
 468         },
 469         {
 470          .callback = video_set_use_native_backlight,
 471          .ident = "ThinkPad X230",
 472          .matches = {
 473                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 474                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X230"),
 475                 },
 476         },
 477         {
 478          .callback = video_set_use_native_backlight,
 479          .ident = "ThinkPad W530",
 480          .matches = {
 481                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 482                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
 483                 },
 484         },
 485         {
 486          .callback = video_set_use_native_backlight,
 487         .ident = "ThinkPad X1 Carbon",
 488         .matches = {
 489                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 490                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X1 Carbon"),
 491                 },
 492         },
 493         {
 494          .callback = video_set_use_native_backlight,
 495          .ident = "Lenovo Yoga 13",
 496          .matches = {
 497                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 498                 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"),
 499                 },
 500         },
 501         {
 502          .callback = video_set_use_native_backlight,
 503          .ident = "Lenovo Yoga 2 11",
 504          .matches = {
 505                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 506                 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 2 11"),
 507                 },
 508         },
 509         {
 510         .callback = video_set_use_native_backlight,
 511         .ident = "Thinkpad Helix",
 512         .matches = {
 513                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 514                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
 515                 },
 516         },
 517         {
 518          .callback = video_set_use_native_backlight,
 519          .ident = "Dell Inspiron 7520",
 520          .matches = {
 521                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 522                 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
 523                 },
 524         },
 525         {
 526          .callback = video_set_use_native_backlight,
 527          .ident = "Acer Aspire 5733Z",
 528          .matches = {
 529                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 530                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5733Z"),
 531                 },
 532         },
 533         {
 534          .callback = video_set_use_native_backlight,
 535          .ident = "Acer Aspire 5742G",
 536          .matches = {
 537                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 538                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5742G"),
 539                 },
 540         },
 541         {
 542          .callback = video_set_use_native_backlight,
 543          .ident = "Acer Aspire V5-171",
 544          .matches = {
 545                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 546                 DMI_MATCH(DMI_PRODUCT_NAME, "V5-171"),
 547                 },
 548         },
 549         {
 550          .callback = video_set_use_native_backlight,
 551          .ident = "Acer Aspire V5-431",
 552          .matches = {
 553                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 554                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-431"),
 555                 },
 556         },
 557         {
 558          .callback = video_set_use_native_backlight,
 559          .ident = "Acer Aspire V5-471G",
 560          .matches = {
 561                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 562                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-471G"),
 563                 },
 564         },
 565         {
 566         .callback = video_set_use_native_backlight,
 567         .ident = "HP ProBook 4340s",
 568         .matches = {
 569                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 570                 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4340s"),
 571                 },
 572         },
 573         {
 574         .callback = video_set_use_native_backlight,
 575         .ident = "HP ProBook 2013 models",
 576         .matches = {
 577                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 578                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook "),
 579                 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
 580                 },
 581         },
 582         {
 583         .callback = video_set_use_native_backlight,
 584         .ident = "HP EliteBook 2013 models",
 585         .matches = {
 586                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 587                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
 588                 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
 589                 },
 590         },
 591         {
 592         .callback = video_set_use_native_backlight,
 593         .ident = "HP ZBook 14",
 594         .matches = {
 595                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 596                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 14"),
 597                 },
 598         },
 599         {
 600         .callback = video_set_use_native_backlight,
 601         .ident = "HP ZBook 15",
 602         .matches = {
 603                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 604                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 15"),
 605                 },
 606         },
 607         {
 608         .callback = video_set_use_native_backlight,
 609         .ident = "HP ZBook 17",
 610         .matches = {
 611                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 612                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 17"),
 613                 },
 614         },
 615         {
 616         .callback = video_set_use_native_backlight,
 617         .ident = "HP EliteBook 8470p",
 618         .matches = {
 619                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 620                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8470p"),
 621                 },
 622         },
 623         {
 624         .callback = video_set_use_native_backlight,
 625         .ident = "HP EliteBook 8780w",
 626         .matches = {
 627                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 628                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
 629                 },
 630         },
 631         {}
 632 };
 633
 634 static unsigned long long
 635 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
 636                               unsigned long long bqc_value)
 637 {
 638         unsigned long long level;
 639
 640         if (device->brightness->flags._BQC_use_index) {
 641                 /*
 642                  * _BQC returns an index that doesn't account for
 643                  * the first 2 items with special meaning, so we need
 644                  * to compensate for that by offsetting ourselves
 645                  */
 646                 if (device->brightness->flags._BCL_reversed)
 647                         bqc_value = device->brightness->count - 3 - bqc_value;
 648
 649                 level = device->brightness->levels[bqc_value + 2];
 650         } else {
 651                 level = bqc_value;
 652         }
 653
 654         level += bqc_offset_aml_bug_workaround;
 655
 656         return level;
 657 }
 658
 659 static int
 660 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 661                                         unsigned long long *level, bool raw)
 662 {
 663         acpi_status status = AE_OK;
 664         int i;
 665
 666         if (device->cap._BQC || device->cap._BCQ) {
 667                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 668
 669                 status = acpi_evaluate_integer(device->dev->handle, buf,
 670                                                 NULL, level);
 671                 if (ACPI_SUCCESS(status)) {
 672                         if (raw) {
 673                                 /*
 674                                  * Caller has indicated he wants the raw
 675                                  * value returned by _BQC, so don't furtherly
 676                                  * mess with the value.
 677                                  */
 678                                 return 0;
 679                         }
 680
 681                         *level = acpi_video_bqc_value_to_level(device, *level);
 682
 683                         for (i = 2; i < device->brightness->count; i++)
 684                                 if (device->brightness->levels[i] == *level) {
 685                                         device->brightness->curr = *level;
 686                                         return 0;
 687                                 }
 688                         /*
 689                          * BQC returned an invalid level.
 690                          * Stop using it.
 691                          */
 692                         ACPI_WARNING((AE_INFO,
 693                                       "%s returned an invalid level",
 694                                       buf));
 695                         device->cap._BQC = device->cap._BCQ = 0;
 696                 } else {
 697                         /*
 698                          * Fixme:
 699                          * should we return an error or ignore this failure?
 700                          * dev->brightness->curr is a cached value which stores
 701                          * the correct current backlight level in most cases.
 702                          * ACPI video backlight still works w/ buggy _BQC.
 703                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 704                          */
 705                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 706                         device->cap._BQC = device->cap._BCQ = 0;
 707                 }
 708         }
 709
 710         *level = device->brightness->curr;
 711         return 0;
 712 }
 713
 714 static int
 715 acpi_video_device_EDID(struct acpi_video_device *device,
 716                        union acpi_object **edid, ssize_t length)
 717 {
 718         int status;
 719         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 720         union acpi_object *obj;
 721         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 722         struct acpi_object_list args = { 1, &arg0 };
 723
 724
 725         *edid = NULL;
 726
 727         if (!device)
 728                 return -ENODEV;
 729         if (length == 128)
 730                 arg0.integer.value = 1;
 731         else if (length == 256)
 732                 arg0.integer.value = 2;
 733         else
 734                 return -EINVAL;
 735
 736         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 737         if (ACPI_FAILURE(status))
 738                 return -ENODEV;
 739
 740         obj = buffer.pointer;
 741
 742         if (obj && obj->type == ACPI_TYPE_BUFFER)
 743                 *edid = obj;
 744         else {
 745                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 746                 status = -EFAULT;
 747                 kfree(obj);
 748         }
 749
 750         return status;
 751 }
 752
 753 /* bus */
 754
 755 /*
 756  *  Arg:
 757  *      video           : video bus device pointer
 758  *      bios_flag       :
 759  *              0.      The system BIOS should NOT automatically switch(toggle)
 760  *                      the active display output.
 761  *              1.      The system BIOS should automatically switch (toggle) the
 762  *                      active display output. No switch event.
 763  *              2.      The _DGS value should be locked.
 764  *              3.      The system BIOS should not automatically switch (toggle) the
 765  *                      active display output, but instead generate the display switch
 766  *                      event notify code.
 767  *      lcd_flag        :
 768  *              0.      The system BIOS should automatically control the brightness level
 769  *                      of the LCD when the power changes from AC to DC
 770  *              1.      The system BIOS should NOT automatically control the brightness
 771  *                      level of the LCD when the power changes from AC to DC.
 772  *  Return Value:
 773  *              -EINVAL wrong arg.
 774  */
 775
 776 static int
 777 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 778 {
 779         acpi_status status;
 780
 781         if (!video->cap._DOS)
 782                 return 0;
 783
 784         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
 785                 return -EINVAL;
 786         video->dos_setting = (lcd_flag << 2) | bios_flag;
 787         status = acpi_execute_simple_method(video->device->handle, "_DOS",
 788                                             (lcd_flag << 2) | bios_flag);
 789         if (ACPI_FAILURE(status))
 790                 return -EIO;
 791
 792         return 0;
 793 }
 794
 795 /*
 796  * Simple comparison function used to sort backlight levels.
 797  */
 798
 799 static int
 800 acpi_video_cmp_level(const void *a, const void *b)
 801 {
 802         return *(int *)a - *(int *)b;
 803 }
 804
 805 /*
 806  * Decides if _BQC/_BCQ for this system is usable
 807  *
 808  * We do this by changing the level first and then read out the current
 809  * brightness level, if the value does not match, find out if it is using
 810  * index. If not, clear the _BQC/_BCQ capability.
 811  */
 812 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
 813                                 int max_level, int current_level)
 814 {
 815         struct acpi_video_device_brightness *br = device->brightness;
 816         int result;
 817         unsigned long long level;
 818         int test_level;
 819
 820         /* don't mess with existing known broken systems */
 821         if (bqc_offset_aml_bug_workaround)
 822                 return 0;
 823
 824         /*
 825          * Some systems always report current brightness level as maximum
 826          * through _BQC, we need to test another value for them.
 827          */
 828         test_level = current_level == max_level ? br->levels[3] : max_level;
 829
 830         result = acpi_video_device_lcd_set_level(device, test_level);
 831         if (result)
 832                 return result;
 833
 834         result = acpi_video_device_lcd_get_level_current(device, &level, true);
 835         if (result)
 836                 return result;
 837
 838         if (level != test_level) {
 839                 /* buggy _BQC found, need to find out if it uses index */
 840                 if (level < br->count) {
 841                         if (br->flags._BCL_reversed)
 842                                 level = br->count - 3 - level;
 843                         if (br->levels[level + 2] == test_level)
 844                                 br->flags._BQC_use_index = 1;
 845                 }
 846
 847                 if (!br->flags._BQC_use_index)
 848                         device->cap._BQC = device->cap._BCQ = 0;
 849         }
 850
 851         return 0;
 852 }
 853
 854
 855 /*
 856  *  Arg:
 857  *      device  : video output device (LCD, CRT, ..)
 858  *
 859  *  Return Value:
 860  *      Maximum brightness level
 861  *
 862  *  Allocate and initialize device->brightness.
 863  */
 864
 865 static int
 866 acpi_video_init_brightness(struct acpi_video_device *device)
 867 {
 868         union acpi_object *obj = NULL;
 869         int i, max_level = 0, count = 0, level_ac_battery = 0;
 870         unsigned long long level, level_old;
 871         union acpi_object *o;
 872         struct acpi_video_device_brightness *br = NULL;
 873         int result = -EINVAL;
 874         u32 value;
 875
 876         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 877                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 878                                                 "LCD brightness level\n"));
 879                 goto out;
 880         }
 881
 882         if (obj->package.count < 2)
 883                 goto out;
 884
 885         br = kzalloc(sizeof(*br), GFP_KERNEL);
 886         if (!br) {
 887                 printk(KERN_ERR "can't allocate memory\n");
 888                 result = -ENOMEM;
 889                 goto out;
 890         }
 891
 892         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 893                                 GFP_KERNEL);
 894         if (!br->levels) {
 895                 result = -ENOMEM;
 896                 goto out_free;
 897         }
 898
 899         for (i = 0; i < obj->package.count; i++) {
 900                 o = (union acpi_object *)&obj->package.elements[i];
 901                 if (o->type != ACPI_TYPE_INTEGER) {
 902                         printk(KERN_ERR PREFIX "Invalid data\n");
 903                         continue;
 904                 }
 905                 value = (u32) o->integer.value;
 906                 /* Skip duplicate entries */
 907                 if (count > 2 && br->levels[count - 1] == value)
 908                         continue;
 909
 910                 br->levels[count] = value;
 911
 912                 if (br->levels[count] > max_level)
 913                         max_level = br->levels[count];
 914                 count++;
 915         }
 916
 917         /*
 918          * some buggy BIOS don't export the levels
 919          * when machine is on AC/Battery in _BCL package.
 920          * In this case, the first two elements in _BCL packages
 921          * are also supported brightness levels that OS should take care of.
 922          */
 923         for (i = 2; i < count; i++) {
 924                 if (br->levels[i] == br->levels[0])
 925                         level_ac_battery++;
 926                 if (br->levels[i] == br->levels[1])
 927                         level_ac_battery++;
 928         }
 929
 930         if (level_ac_battery < 2) {
 931                 level_ac_battery = 2 - level_ac_battery;
 932                 br->flags._BCL_no_ac_battery_levels = 1;
 933                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 934                         br->levels[i] = br->levels[i - level_ac_battery];
 935                 count += level_ac_battery;
 936         } else if (level_ac_battery > 2)
 937                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
 938
 939         /* Check if the _BCL package is in a reversed order */
 940         if (max_level == br->levels[2]) {
 941                 br->flags._BCL_reversed = 1;
 942                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 943                         acpi_video_cmp_level, NULL);
 944         } else if (max_level != br->levels[count - 1])
 945                 ACPI_ERROR((AE_INFO,
 946                             "Found unordered _BCL package"));
 947
 948         br->count = count;
 949         device->brightness = br;
 950
 951         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 952         br->curr = level = max_level;
 953
 954         if (!device->cap._BQC)
 955                 goto set_level;
 956
 957         result = acpi_video_device_lcd_get_level_current(device,
 958                                                          &level_old, true);
 959         if (result)
 960                 goto out_free_levels;
 961
 962         result = acpi_video_bqc_quirk(device, max_level, level_old);
 963         if (result)
 964                 goto out_free_levels;
 965         /*
 966          * cap._BQC may get cleared due to _BQC is found to be broken
 967          * in acpi_video_bqc_quirk, so check again here.
 968          */
 969         if (!device->cap._BQC)
 970                 goto set_level;
 971
 972         level = acpi_video_bqc_value_to_level(device, level_old);
 973         /*
 974          * On some buggy laptops, _BQC returns an uninitialized
 975          * value when invoked for the first time, i.e.
 976          * level_old is invalid (no matter whether it's a level
 977          * or an index). Set the backlight to max_level in this case.
 978          */
 979         for (i = 2; i < br->count; i++)
 980                 if (level == br->levels[i])
 981                         break;
 982         if (i == br->count || !level)
 983                 level = max_level;
 984
 985 set_level:
 986         result = acpi_video_device_lcd_set_level(device, level);
 987         if (result)
 988                 goto out_free_levels;
 989
 990         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 991                           "found %d brightness levels\n", count - 2));
 992         kfree(obj);
 993         return result;
 994
 995 out_free_levels:
 996         kfree(br->levels);
 997 out_free:
 998         kfree(br);
 999 out:
1000         device->brightness = NULL;
1001         kfree(obj);
1002         return result;
1003 }
1004
1005 /*
1006  *  Arg:
1007  *      device  : video output device (LCD, CRT, ..)
1008  *
1009  *  Return Value:
1010  *      None
1011  *
1012  *  Find out all required AML methods defined under the output
1013  *  device.
1014  */
1015
1016 static void acpi_video_device_find_cap(struct acpi_video_device *device)
1017 {
1018         if (acpi_has_method(device->dev->handle, "_ADR"))
1019                 device->cap._ADR = 1;
1020         if (acpi_has_method(device->dev->handle, "_BCL"))
1021                 device->cap._BCL = 1;
1022         if (acpi_has_method(device->dev->handle, "_BCM"))
1023                 device->cap._BCM = 1;
1024         if (acpi_has_method(device->dev->handle, "_BQC")) {
1025                 device->cap._BQC = 1;
1026         } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
1027                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1028                 device->cap._BCQ = 1;
1029         }
1030
1031         if (acpi_has_method(device->dev->handle, "_DDC"))
1032                 device->cap._DDC = 1;
1033 }
1034
1035 /*
1036  *  Arg:
1037  *      device  : video output device (VGA)
1038  *
1039  *  Return Value:
1040  *      None
1041  *
1042  *  Find out all required AML methods defined under the video bus device.
1043  */
1044
1045 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1046 {
1047         if (acpi_has_method(video->device->handle, "_DOS"))
1048                 video->cap._DOS = 1;
1049         if (acpi_has_method(video->device->handle, "_DOD"))
1050                 video->cap._DOD = 1;
1051         if (acpi_has_method(video->device->handle, "_ROM"))
1052                 video->cap._ROM = 1;
1053         if (acpi_has_method(video->device->handle, "_GPD"))
1054                 video->cap._GPD = 1;
1055         if (acpi_has_method(video->device->handle, "_SPD"))
1056                 video->cap._SPD = 1;
1057         if (acpi_has_method(video->device->handle, "_VPO"))
1058                 video->cap._VPO = 1;
1059 }
1060
1061 /*
1062  * Check whether the video bus device has required AML method to
1063  * support the desired features
1064  */
1065
1066 static int acpi_video_bus_check(struct acpi_video_bus *video)
1067 {
1068         acpi_status status = -ENOENT;
1069         struct pci_dev *dev;
1070
1071         if (!video)
1072                 return -EINVAL;
1073
1074         dev = acpi_get_pci_dev(video->device->handle);
1075         if (!dev)
1076                 return -ENODEV;
1077         pci_dev_put(dev);
1078
1079         /*
1080          * Since there is no HID, CID and so on for VGA driver, we have
1081          * to check well known required nodes.
1082          */
1083
1084         /* Does this device support video switching? */
1085         if (video->cap._DOS || video->cap._DOD) {
1086                 if (!video->cap._DOS) {
1087                         printk(KERN_WARNING FW_BUG
1088                                 "ACPI(%s) defines _DOD but not _DOS\n",
1089                                 acpi_device_bid(video->device));
1090                 }
1091                 video->flags.multihead = 1;
1092                 status = 0;
1093         }
1094
1095         /* Does this device support retrieving a video ROM? */
1096         if (video->cap._ROM) {
1097                 video->flags.rom = 1;
1098                 status = 0;
1099         }
1100
1101         /* Does this device support configuring which video device to POST? */
1102         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1103                 video->flags.post = 1;
1104                 status = 0;
1105         }
1106
1107         return status;
1108 }
1109
1110 /*
1111  * --------------------------------------------------------------------------
1112  *                               Driver Interface
1113  * --------------------------------------------------------------------------
1114  */
1115
1116 /* device interface */
1117 static struct acpi_video_device_attrib *
1118 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1119 {
1120         struct acpi_video_enumerated_device *ids;
1121         int i;
1122
1123         for (i = 0; i < video->attached_count; i++) {
1124                 ids = &video->attached_array[i];
1125                 if ((ids->value.int_val & 0xffff) == device_id)
1126                         return &ids->value.attrib;
1127         }
1128
1129         return NULL;
1130 }
1131
1132 static int
1133 acpi_video_get_device_type(struct acpi_video_bus *video,
1134                            unsigned long device_id)
1135 {
1136         struct acpi_video_enumerated_device *ids;
1137         int i;
1138
1139         for (i = 0; i < video->attached_count; i++) {
1140                 ids = &video->attached_array[i];
1141                 if ((ids->value.int_val & 0xffff) == device_id)
1142                         return ids->value.int_val;
1143         }
1144
1145         return 0;
1146 }
1147
1148 static int
1149 acpi_video_bus_get_one_device(struct acpi_device *device,
1150                               struct acpi_video_bus *video)
1151 {
1152         unsigned long long device_id;
1153         int status, device_type;
1154         struct acpi_video_device *data;
1155         struct acpi_video_device_attrib *attribute;
1156
1157         status =
1158             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1159         /* Some device omits _ADR, we skip them instead of fail */
1160         if (ACPI_FAILURE(status))
1161                 return 0;
1162
1163         data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1164         if (!data)
1165                 return -ENOMEM;
1166
1167         strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1168         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1169         device->driver_data = data;
1170
1171         data->device_id = device_id;
1172         data->video = video;
1173         data->dev = device;
1174
1175         attribute = acpi_video_get_device_attr(video, device_id);
1176
1177         if (attribute && attribute->device_id_scheme) {
1178                 switch (attribute->display_type) {
1179                 case ACPI_VIDEO_DISPLAY_CRT:
1180                         data->flags.crt = 1;
1181                         break;
1182                 case ACPI_VIDEO_DISPLAY_TV:
1183                         data->flags.tvout = 1;
1184                         break;
1185                 case ACPI_VIDEO_DISPLAY_DVI:
1186                         data->flags.dvi = 1;
1187                         break;
1188                 case ACPI_VIDEO_DISPLAY_LCD:
1189                         data->flags.lcd = 1;
1190                         break;
1191                 default:
1192                         data->flags.unknown = 1;
1193                         break;
1194                 }
1195                 if (attribute->bios_can_detect)
1196                         data->flags.bios = 1;
1197         } else {
1198                 /* Check for legacy IDs */
1199                 device_type = acpi_video_get_device_type(video, device_id);
1200                 /* Ignore bits 16 and 18-20 */
1201                 switch (device_type & 0xffe2ffff) {
1202                 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1203                         data->flags.crt = 1;
1204                         break;
1205                 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1206                         data->flags.lcd = 1;
1207                         break;
1208                 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1209                         data->flags.tvout = 1;
1210                         break;
1211                 default:
1212                         data->flags.unknown = 1;
1213                 }
1214         }
1215
1216         acpi_video_device_bind(video, data);
1217         acpi_video_device_find_cap(data);
1218
1219         mutex_lock(&video->device_list_lock);
1220         list_add_tail(&data->entry, &video->video_device_list);
1221         mutex_unlock(&video->device_list_lock);
1222
1223         return status;
1224 }
1225
1226 /*
1227  *  Arg:
1228  *      video   : video bus device
1229  *
1230  *  Return:
1231  *      none
1232  *
1233  *  Enumerate the video device list of the video bus,
1234  *  bind the ids with the corresponding video devices
1235  *  under the video bus.
1236  */
1237
1238 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1239 {
1240         struct acpi_video_device *dev;
1241
1242         mutex_lock(&video->device_list_lock);
1243
1244         list_for_each_entry(dev, &video->video_device_list, entry)
1245                 acpi_video_device_bind(video, dev);
1246
1247         mutex_unlock(&video->device_list_lock);
1248 }
1249
1250 /*
1251  *  Arg:
1252  *      video   : video bus device
1253  *      device  : video output device under the video
1254  *              bus
1255  *
1256  *  Return:
1257  *      none
1258  *
1259  *  Bind the ids with the corresponding video devices
1260  *  under the video bus.
1261  */
1262
1263 static void
1264 acpi_video_device_bind(struct acpi_video_bus *video,
1265                        struct acpi_video_device *device)
1266 {
1267         struct acpi_video_enumerated_device *ids;
1268         int i;
1269
1270         for (i = 0; i < video->attached_count; i++) {
1271                 ids = &video->attached_array[i];
1272                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1273                         ids->bind_info = device;
1274                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1275                 }
1276         }
1277 }
1278
1279 /*
1280  *  Arg:
1281  *      video   : video bus device
1282  *
1283  *  Return:
1284  *      < 0     : error
1285  *
1286  *  Call _DOD to enumerate all devices attached to display adapter
1287  *
1288  */
1289
1290 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1291 {
1292         int status;
1293         int count;
1294         int i;
1295         struct acpi_video_enumerated_device *active_list;
1296         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1297         union acpi_object *dod = NULL;
1298         union acpi_object *obj;
1299
1300         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1301         if (!ACPI_SUCCESS(status)) {
1302                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1303                 return status;
1304         }
1305
1306         dod = buffer.pointer;
1307         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1308                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1309                 status = -EFAULT;
1310                 goto out;
1311         }
1312
1313         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1314                           dod->package.count));
1315
1316         active_list = kcalloc(1 + dod->package.count,
1317                               sizeof(struct acpi_video_enumerated_device),
1318                               GFP_KERNEL);
1319         if (!active_list) {
1320                 status = -ENOMEM;
1321                 goto out;
1322         }
1323
1324         count = 0;
1325         for (i = 0; i < dod->package.count; i++) {
1326                 obj = &dod->package.elements[i];
1327
1328                 if (obj->type != ACPI_TYPE_INTEGER) {
1329                         printk(KERN_ERR PREFIX
1330                                 "Invalid _DOD data in element %d\n", i);
1331                         continue;
1332                 }
1333
1334                 active_list[count].value.int_val = obj->integer.value;
1335                 active_list[count].bind_info = NULL;
1336                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1337                                   (int)obj->integer.value));
1338                 count++;
1339         }
1340
1341         kfree(video->attached_array);
1342
1343         video->attached_array = active_list;
1344         video->attached_count = count;
1345
1346 out:
1347         kfree(buffer.pointer);
1348         return status;
1349 }
1350
1351 static int
1352 acpi_video_get_next_level(struct acpi_video_device *device,
1353                           u32 level_current, u32 event)
1354 {
1355         int min, max, min_above, max_below, i, l, delta = 255;
1356         max = max_below = 0;
1357         min = min_above = 255;
1358         /* Find closest level to level_current */
1359         for (i = 2; i < device->brightness->count; i++) {
1360                 l = device->brightness->levels[i];
1361                 if (abs(l - level_current) < abs(delta)) {
1362                         delta = l - level_current;
1363                         if (!delta)
1364                                 break;
1365                 }
1366         }
1367         /* Ajust level_current to closest available level */
1368         level_current += delta;
1369         for (i = 2; i < device->brightness->count; i++) {
1370                 l = device->brightness->levels[i];
1371                 if (l < min)
1372                         min = l;
1373                 if (l > max)
1374                         max = l;
1375                 if (l < min_above && l > level_current)
1376                         min_above = l;
1377                 if (l > max_below && l < level_current)
1378                         max_below = l;
1379         }
1380
1381         switch (event) {
1382         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1383                 return (level_current < max) ? min_above : min;
1384         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1385                 return (level_current < max) ? min_above : max;
1386         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1387                 return (level_current > min) ? max_below : min;
1388         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1389         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1390                 return 0;
1391         default:
1392                 return level_current;
1393         }
1394 }
1395
1396 static int
1397 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1398 {
1399         unsigned long long level_current, level_next;
1400         int result = -EINVAL;
1401
1402         /* no warning message if acpi_backlight=vendor or a quirk is used */
1403         if (!acpi_video_verify_backlight_support())
1404                 return 0;
1405
1406         if (!device->brightness)
1407                 goto out;
1408
1409         result = acpi_video_device_lcd_get_level_current(device,
1410                                                          &level_current,
1411                                                          false);
1412         if (result)
1413                 goto out;
1414
1415         level_next = acpi_video_get_next_level(device, level_current, event);
1416
1417         result = acpi_video_device_lcd_set_level(device, level_next);
1418
1419         if (!result)
1420                 backlight_force_update(device->backlight,
1421                                        BACKLIGHT_UPDATE_HOTKEY);
1422
1423 out:
1424         if (result)
1425                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1426
1427         return result;
1428 }
1429
1430 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1431                         void **edid)
1432 {
1433         struct acpi_video_bus *video;
1434         struct acpi_video_device *video_device;
1435         union acpi_object *buffer = NULL;
1436         acpi_status status;
1437         int i, length;
1438
1439         if (!device || !acpi_driver_data(device))
1440                 return -EINVAL;
1441
1442         video = acpi_driver_data(device);
1443
1444         for (i = 0; i < video->attached_count; i++) {
1445                 video_device = video->attached_array[i].bind_info;
1446                 length = 256;
1447
1448                 if (!video_device)
1449                         continue;
1450
1451                 if (!video_device->cap._DDC)
1452                         continue;
1453
1454                 if (type) {
1455                         switch (type) {
1456                         case ACPI_VIDEO_DISPLAY_CRT:
1457                                 if (!video_device->flags.crt)
1458                                         continue;
1459                                 break;
1460                         case ACPI_VIDEO_DISPLAY_TV:
1461                                 if (!video_device->flags.tvout)
1462                                         continue;
1463                                 break;
1464                         case ACPI_VIDEO_DISPLAY_DVI:
1465                                 if (!video_device->flags.dvi)
1466                                         continue;
1467                                 break;
1468                         case ACPI_VIDEO_DISPLAY_LCD:
1469                                 if (!video_device->flags.lcd)
1470                                         continue;
1471                                 break;
1472                         }
1473                 } else if (video_device->device_id != device_id) {
1474                         continue;
1475                 }
1476
1477                 status = acpi_video_device_EDID(video_device, &buffer, length);
1478
1479                 if (ACPI_FAILURE(status) || !buffer ||
1480                     buffer->type != ACPI_TYPE_BUFFER) {
1481                         length = 128;
1482                         status = acpi_video_device_EDID(video_device, &buffer,
1483                                                         length);
1484                         if (ACPI_FAILURE(status) || !buffer ||
1485                             buffer->type != ACPI_TYPE_BUFFER) {
1486                                 continue;
1487                         }
1488                 }
1489
1490                 *edid = buffer->buffer.pointer;
1491                 return length;
1492         }
1493
1494         return -ENODEV;
1495 }
1496 EXPORT_SYMBOL(acpi_video_get_edid);
1497
1498 static int
1499 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1500                            struct acpi_device *device)
1501 {
1502         int status = 0;
1503         struct acpi_device *dev;
1504
1505         /*
1506          * There are systems where video module known to work fine regardless
1507          * of broken _DOD and ignoring returned value here doesn't cause
1508          * any issues later.
1509          */
1510         acpi_video_device_enumerate(video);
1511
1512         list_for_each_entry(dev, &device->children, node) {
1513
1514                 status = acpi_video_bus_get_one_device(dev, video);
1515                 if (status) {
1516                         dev_err(&dev->dev, "Can't attach device\n");
1517                         break;
1518                 }
1519         }
1520         return status;
1521 }
1522
1523 /* acpi_video interface */
1524
1525 /*
1526  * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1527  * preform any automatic brightness change on receiving a notification.
1528  */
1529 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1530 {
1531         return acpi_video_bus_DOS(video, 0,
1532                                   acpi_osi_is_win8() ? 1 : 0);
1533 }
1534
1535 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1536 {
1537         return acpi_video_bus_DOS(video, 0,
1538                                   acpi_osi_is_win8() ? 0 : 1);
1539 }
1540
1541 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1542 {
1543         struct acpi_video_bus *video = acpi_driver_data(device);
1544         struct input_dev *input;
1545         int keycode = 0;
1546
1547         if (!video || !video->input)
1548                 return;
1549
1550         input = video->input;
1551
1552         switch (event) {
1553         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1554                                          * most likely via hotkey. */
1555                 keycode = KEY_SWITCHVIDEOMODE;
1556                 break;
1557
1558         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1559                                          * connector. */
1560                 acpi_video_device_enumerate(video);
1561                 acpi_video_device_rebind(video);
1562                 keycode = KEY_SWITCHVIDEOMODE;
1563                 break;
1564
1565         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1566                 keycode = KEY_SWITCHVIDEOMODE;
1567                 break;
1568         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1569                 keycode = KEY_VIDEO_NEXT;
1570                 break;
1571         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1572                 keycode = KEY_VIDEO_PREV;
1573                 break;
1574
1575         default:
1576                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1577                                   "Unsupported event [0x%x]\n", event));
1578                 break;
1579         }
1580
1581         if (acpi_notifier_call_chain(device, event, 0))
1582                 /* Something vetoed the keypress. */
1583                 keycode = 0;
1584
1585         if (keycode) {
1586                 input_report_key(input, keycode, 1);
1587                 input_sync(input);
1588                 input_report_key(input, keycode, 0);
1589                 input_sync(input);
1590         }
1591
1592         return;
1593 }
1594
1595 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1596 {
1597         struct acpi_video_device *video_device = data;
1598         struct acpi_device *device = NULL;
1599         struct acpi_video_bus *bus;
1600         struct input_dev *input;
1601         int keycode = 0;
1602
1603         if (!video_device)
1604                 return;
1605
1606         device = video_device->dev;
1607         bus = video_device->video;
1608         input = bus->input;
1609
1610         switch (event) {
1611         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1612                 if (brightness_switch_enabled)
1613                         acpi_video_switch_brightness(video_device, event);
1614                 keycode = KEY_BRIGHTNESS_CYCLE;
1615                 break;
1616         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1617                 if (brightness_switch_enabled)
1618                         acpi_video_switch_brightness(video_device, event);
1619                 keycode = KEY_BRIGHTNESSUP;
1620                 break;
1621         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1622                 if (brightness_switch_enabled)
1623                         acpi_video_switch_brightness(video_device, event);
1624                 keycode = KEY_BRIGHTNESSDOWN;
1625                 break;
1626         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1627                 if (brightness_switch_enabled)
1628                         acpi_video_switch_brightness(video_device, event);
1629                 keycode = KEY_BRIGHTNESS_ZERO;
1630                 break;
1631         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1632                 if (brightness_switch_enabled)
1633                         acpi_video_switch_brightness(video_device, event);
1634                 keycode = KEY_DISPLAY_OFF;
1635                 break;
1636         default:
1637                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1638                                   "Unsupported event [0x%x]\n", event));
1639                 break;
1640         }
1641
1642         acpi_notifier_call_chain(device, event, 0);
1643
1644         if (keycode) {
1645                 input_report_key(input, keycode, 1);
1646                 input_sync(input);
1647                 input_report_key(input, keycode, 0);
1648                 input_sync(input);
1649         }
1650
1651         return;
1652 }
1653
1654 static int acpi_video_resume(struct notifier_block *nb,
1655                                 unsigned long val, void *ign)
1656 {
1657         struct acpi_video_bus *video;
1658         struct acpi_video_device *video_device;
1659         int i;
1660
1661         switch (val) {
1662         case PM_HIBERNATION_PREPARE:
1663         case PM_SUSPEND_PREPARE:
1664         case PM_RESTORE_PREPARE:
1665                 return NOTIFY_DONE;
1666         }
1667
1668         video = container_of(nb, struct acpi_video_bus, pm_nb);
1669
1670         dev_info(&video->device->dev, "Restoring backlight state\n");
1671
1672         for (i = 0; i < video->attached_count; i++) {
1673                 video_device = video->attached_array[i].bind_info;
1674                 if (video_device && video_device->backlight)
1675                         acpi_video_set_brightness(video_device->backlight);
1676         }
1677
1678         return NOTIFY_OK;
1679 }
1680
1681 static acpi_status
1682 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1683                         void **return_value)
1684 {
1685         struct acpi_device *device = context;
1686         struct acpi_device *sibling;
1687         int result;
1688
1689         if (handle == device->handle)
1690                 return AE_CTRL_TERMINATE;
1691
1692         result = acpi_bus_get_device(handle, &sibling);
1693         if (result)
1694                 return AE_OK;
1695
1696         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1697                         return AE_ALREADY_EXISTS;
1698
1699         return AE_OK;
1700 }
1701
1702 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1703 {
1704         struct backlight_properties props;
1705         struct pci_dev *pdev;
1706         acpi_handle acpi_parent;
1707         struct device *parent = NULL;
1708         int result;
1709         static int count;
1710         char *name;
1711
1712         result = acpi_video_init_brightness(device);
1713         if (result)
1714                 return;
1715         name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1716         if (!name)
1717                 return;
1718         count++;
1719
1720         acpi_get_parent(device->dev->handle, &acpi_parent);
1721
1722         pdev = acpi_get_pci_dev(acpi_parent);
1723         if (pdev) {
1724                 parent = &pdev->dev;
1725                 pci_dev_put(pdev);
1726         }
1727
1728         memset(&props, 0, sizeof(struct backlight_properties));
1729         props.type = BACKLIGHT_FIRMWARE;
1730         props.max_brightness = device->brightness->count - 3;
1731         device->backlight = backlight_device_register(name,
1732                                                       parent,
1733                                                       device,
1734                                                       &acpi_backlight_ops,
1735                                                       &props);
1736         kfree(name);
1737         if (IS_ERR(device->backlight))
1738                 return;
1739
1740         /*
1741          * Save current brightness level in case we have to restore it
1742          * before acpi_video_device_lcd_set_level() is called next time.
1743          */
1744         device->backlight->props.brightness =
1745                         acpi_video_get_brightness(device->backlight);
1746
1747         device->cooling_dev = thermal_cooling_device_register("LCD",
1748                                 device->dev, &video_cooling_ops);
1749         if (IS_ERR(device->cooling_dev)) {
1750                 /*
1751                  * Set cooling_dev to NULL so we don't crash trying to free it.
1752                  * Also, why the hell we are returning early and not attempt to
1753                  * register video output if cooling device registration failed?
1754                  * -- dtor
1755                  */
1756                 device->cooling_dev = NULL;
1757                 return;
1758         }
1759
1760         dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1761                  device->cooling_dev->id);
1762         result = sysfs_create_link(&device->dev->dev.kobj,
1763                         &device->cooling_dev->device.kobj,
1764                         "thermal_cooling");
1765         if (result)
1766                 printk(KERN_ERR PREFIX "Create sysfs link\n");
1767         result = sysfs_create_link(&device->cooling_dev->device.kobj,
1768                         &device->dev->dev.kobj, "device");
1769         if (result)
1770                 printk(KERN_ERR PREFIX "Create sysfs link\n");
1771 }
1772
1773 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1774 {
1775         struct acpi_video_device *dev;
1776
1777         if (video->backlight_registered)
1778                 return 0;
1779
1780         if (!acpi_video_verify_backlight_support())
1781                 return 0;
1782
1783         mutex_lock(&video->device_list_lock);
1784         list_for_each_entry(dev, &video->video_device_list, entry)
1785                 acpi_video_dev_register_backlight(dev);
1786         mutex_unlock(&video->device_list_lock);
1787
1788         video->backlight_registered = true;
1789
1790         video->pm_nb.notifier_call = acpi_video_resume;
1791         video->pm_nb.priority = 0;
1792         return register_pm_notifier(&video->pm_nb);
1793 }
1794
1795 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1796 {
1797         if (device->backlight) {
1798                 backlight_device_unregister(device->backlight);
1799                 device->backlight = NULL;
1800         }
1801         if (device->brightness) {
1802                 kfree(device->brightness->levels);
1803                 kfree(device->brightness);
1804                 device->brightness = NULL;
1805         }
1806         if (device->cooling_dev) {
1807                 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1808                 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1809                 thermal_cooling_device_unregister(device->cooling_dev);
1810                 device->cooling_dev = NULL;
1811         }
1812 }
1813
1814 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1815 {
1816         struct acpi_video_device *dev;
1817         int error;
1818
1819         if (!video->backlight_registered)
1820                 return 0;
1821
1822         error = unregister_pm_notifier(&video->pm_nb);
1823
1824         mutex_lock(&video->device_list_lock);
1825         list_for_each_entry(dev, &video->video_device_list, entry)
1826                 acpi_video_dev_unregister_backlight(dev);
1827         mutex_unlock(&video->device_list_lock);
1828
1829         video->backlight_registered = false;
1830
1831         return error;
1832 }
1833
1834 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1835 {
1836         acpi_status status;
1837         struct acpi_device *adev = device->dev;
1838
1839         status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1840                                              acpi_video_device_notify, device);
1841         if (ACPI_FAILURE(status))
1842                 dev_err(&adev->dev, "Error installing notify handler\n");
1843         else
1844                 device->flags.notify = 1;
1845 }
1846
1847 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1848 {
1849         struct input_dev *input;
1850         struct acpi_video_device *dev;
1851         int error;
1852
1853         video->input = input = input_allocate_device();
1854         if (!input) {
1855                 error = -ENOMEM;
1856                 goto out;
1857         }
1858
1859         error = acpi_video_bus_start_devices(video);
1860         if (error)
1861                 goto err_free_input;
1862
1863         snprintf(video->phys, sizeof(video->phys),
1864                         "%s/video/input0", acpi_device_hid(video->device));
1865
1866         input->name = acpi_device_name(video->device);
1867         input->phys = video->phys;
1868         input->id.bustype = BUS_HOST;
1869         input->id.product = 0x06;
1870         input->dev.parent = &video->device->dev;
1871         input->evbit[0] = BIT(EV_KEY);
1872         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1873         set_bit(KEY_VIDEO_NEXT, input->keybit);
1874         set_bit(KEY_VIDEO_PREV, input->keybit);
1875         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1876         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1877         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1878         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1879         set_bit(KEY_DISPLAY_OFF, input->keybit);
1880
1881         error = input_register_device(input);
1882         if (error)
1883                 goto err_stop_dev;
1884
1885         mutex_lock(&video->device_list_lock);
1886         list_for_each_entry(dev, &video->video_device_list, entry)
1887                 acpi_video_dev_add_notify_handler(dev);
1888         mutex_unlock(&video->device_list_lock);
1889
1890         return 0;
1891
1892 err_stop_dev:
1893         acpi_video_bus_stop_devices(video);
1894 err_free_input:
1895         input_free_device(input);
1896         video->input = NULL;
1897 out:
1898         return error;
1899 }
1900
1901 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1902 {
1903         if (dev->flags.notify) {
1904                 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1905                                            acpi_video_device_notify);
1906                 dev->flags.notify = 0;
1907         }
1908 }
1909
1910 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1911 {
1912         struct acpi_video_device *dev;
1913
1914         mutex_lock(&video->device_list_lock);
1915         list_for_each_entry(dev, &video->video_device_list, entry)
1916                 acpi_video_dev_remove_notify_handler(dev);
1917         mutex_unlock(&video->device_list_lock);
1918
1919         acpi_video_bus_stop_devices(video);
1920         input_unregister_device(video->input);
1921         video->input = NULL;
1922 }
1923
1924 static int acpi_video_backlight_notify(struct notifier_block *nb,
1925                                         unsigned long val, void *bd)
1926 {
1927         struct backlight_device *backlight = bd;
1928         struct acpi_video_bus *video;
1929
1930         /* acpi_video_verify_backlight_support only cares about raw devices */
1931         if (backlight->props.type != BACKLIGHT_RAW)
1932                 return NOTIFY_DONE;
1933
1934         video = container_of(nb, struct acpi_video_bus, backlight_nb);
1935
1936         switch (val) {
1937         case BACKLIGHT_REGISTERED:
1938                 if (!acpi_video_verify_backlight_support())
1939                         acpi_video_bus_unregister_backlight(video);
1940                 break;
1941         case BACKLIGHT_UNREGISTERED:
1942                 acpi_video_bus_register_backlight(video);
1943                 break;
1944         }
1945
1946         return NOTIFY_OK;
1947 }
1948
1949 static int acpi_video_bus_add_backlight_notify_handler(
1950                                                 struct acpi_video_bus *video)
1951 {
1952         int error;
1953
1954         video->backlight_nb.notifier_call = acpi_video_backlight_notify;
1955         video->backlight_nb.priority = 0;
1956         error = backlight_register_notifier(&video->backlight_nb);
1957         if (error == 0)
1958                 video->backlight_notifier_registered = true;
1959
1960         return error;
1961 }
1962
1963 static int acpi_video_bus_remove_backlight_notify_handler(
1964                                                 struct acpi_video_bus *video)
1965 {
1966         if (!video->backlight_notifier_registered)
1967                 return 0;
1968
1969         video->backlight_notifier_registered = false;
1970
1971         return backlight_unregister_notifier(&video->backlight_nb);
1972 }
1973
1974 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1975 {
1976         struct acpi_video_device *dev, *next;
1977
1978         mutex_lock(&video->device_list_lock);
1979         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1980                 list_del(&dev->entry);
1981                 kfree(dev);
1982         }
1983         mutex_unlock(&video->device_list_lock);
1984
1985         return 0;
1986 }
1987
1988 static int instance;
1989
1990 static int acpi_video_bus_add(struct acpi_device *device)
1991 {
1992         struct acpi_video_bus *video;
1993         int error;
1994         acpi_status status;
1995
1996         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1997                                 device->parent->handle, 1,
1998                                 acpi_video_bus_match, NULL,
1999                                 device, NULL);
2000         if (status == AE_ALREADY_EXISTS) {
2001                 printk(KERN_WARNING FW_BUG
2002                         "Duplicate ACPI video bus devices for the"
2003                         " same VGA controller, please try module "
2004                         "parameter \"video.allow_duplicates=1\""
2005                         "if the current driver doesn't work.\n");
2006                 if (!allow_duplicates)
2007                         return -ENODEV;
2008         }
2009
2010         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2011         if (!video)
2012                 return -ENOMEM;
2013
2014         /* a hack to fix the duplicate name "VID" problem on T61 */
2015         if (!strcmp(device->pnp.bus_id, "VID")) {
2016                 if (instance)
2017                         device->pnp.bus_id[3] = '0' + instance;
2018                 instance++;
2019         }
2020         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2021         if (!strcmp(device->pnp.bus_id, "VGA")) {
2022                 if (instance)
2023                         device->pnp.bus_id[3] = '0' + instance;
2024                 instance++;
2025         }
2026
2027         video->device = device;
2028         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2029         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2030         device->driver_data = video;
2031
2032         acpi_video_bus_find_cap(video);
2033         error = acpi_video_bus_check(video);
2034         if (error)
2035                 goto err_free_video;
2036
2037         mutex_init(&video->device_list_lock);
2038         INIT_LIST_HEAD(&video->video_device_list);
2039
2040         error = acpi_video_bus_get_devices(video, device);
2041         if (error)
2042                 goto err_put_video;
2043
2044         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2045                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2046                video->flags.multihead ? "yes" : "no",
2047                video->flags.rom ? "yes" : "no",
2048                video->flags.post ? "yes" : "no");
2049         mutex_lock(&video_list_lock);
2050         list_add_tail(&video->entry, &video_bus_head);
2051         mutex_unlock(&video_list_lock);
2052
2053         acpi_video_bus_register_backlight(video);
2054         acpi_video_bus_add_notify_handler(video);
2055         acpi_video_bus_add_backlight_notify_handler(video);
2056
2057         return 0;
2058
2059 err_put_video:
2060         acpi_video_bus_put_devices(video);
2061         kfree(video->attached_array);
2062 err_free_video:
2063         kfree(video);
2064         device->driver_data = NULL;
2065
2066         return error;
2067 }
2068
2069 static int acpi_video_bus_remove(struct acpi_device *device)
2070 {
2071         struct acpi_video_bus *video = NULL;
2072
2073
2074         if (!device || !acpi_driver_data(device))
2075                 return -EINVAL;
2076
2077         video = acpi_driver_data(device);
2078
2079         acpi_video_bus_remove_backlight_notify_handler(video);
2080         acpi_video_bus_remove_notify_handler(video);
2081         acpi_video_bus_unregister_backlight(video);
2082         acpi_video_bus_put_devices(video);
2083
2084         mutex_lock(&video_list_lock);
2085         list_del(&video->entry);
2086         mutex_unlock(&video_list_lock);
2087
2088         kfree(video->attached_array);
2089         kfree(video);
2090
2091         return 0;
2092 }
2093
2094 static int __init is_i740(struct pci_dev *dev)
2095 {
2096         if (dev->device == 0x00D1)
2097                 return 1;
2098         if (dev->device == 0x7000)
2099                 return 1;
2100         return 0;
2101 }
2102
2103 static int __init intel_opregion_present(void)
2104 {
2105         int opregion = 0;
2106         struct pci_dev *dev = NULL;
2107         u32 address;
2108
2109         for_each_pci_dev(dev) {
2110                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2111                         continue;
2112                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2113                         continue;
2114                 /* We don't want to poke around undefined i740 registers */
2115                 if (is_i740(dev))
2116                         continue;
2117                 pci_read_config_dword(dev, 0xfc, &address);
2118                 if (!address)
2119                         continue;
2120                 opregion = 1;
2121         }
2122         return opregion;
2123 }
2124
2125 int acpi_video_register(void)
2126 {
2127         int result = 0;
2128         if (register_count) {
2129                 /*
2130                  * if the function of acpi_video_register is already called,
2131                  * don't register the acpi_vide_bus again and return no error.
2132                  */
2133                 return 0;
2134         }
2135
2136         mutex_init(&video_list_lock);
2137         INIT_LIST_HEAD(&video_bus_head);
2138
2139         result = acpi_bus_register_driver(&acpi_video_bus);
2140         if (result < 0)
2141                 return -ENODEV;
2142
2143         /*
2144          * When the acpi_video_bus is loaded successfully, increase
2145          * the counter reference.
2146          */
2147         register_count = 1;
2148
2149         return 0;
2150 }
2151 EXPORT_SYMBOL(acpi_video_register);
2152
2153 void acpi_video_unregister(void)
2154 {
2155         if (!register_count) {
2156                 /*
2157                  * If the acpi video bus is already unloaded, don't
2158                  * unload it again and return directly.
2159                  */
2160                 return;
2161         }
2162         acpi_bus_unregister_driver(&acpi_video_bus);
2163
2164         register_count = 0;
2165
2166         return;
2167 }
2168 EXPORT_SYMBOL(acpi_video_unregister);
2169
2170 void acpi_video_unregister_backlight(void)
2171 {
2172         struct acpi_video_bus *video;
2173
2174         if (!register_count)
2175                 return;
2176
2177         mutex_lock(&video_list_lock);
2178         list_for_each_entry(video, &video_bus_head, entry)
2179                 acpi_video_bus_unregister_backlight(video);
2180         mutex_unlock(&video_list_lock);
2181 }
2182 EXPORT_SYMBOL(acpi_video_unregister_backlight);
2183
2184 /*
2185  * This is kind of nasty. Hardware using Intel chipsets may require
2186  * the video opregion code to be run first in order to initialise
2187  * state before any ACPI video calls are made. To handle this we defer
2188  * registration of the video class until the opregion code has run.
2189  */
2190
2191 static int __init acpi_video_init(void)
2192 {
2193         dmi_check_system(video_dmi_table);
2194
2195         if (intel_opregion_present())
2196                 return 0;
2197
2198         return acpi_video_register();
2199 }
2200
2201 static void __exit acpi_video_exit(void)
2202 {
2203         acpi_video_unregister();
2204
2205         return;
2206 }
2207
2208 module_init(acpi_video_init);
2209 module_exit(acpi_video_exit);