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 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 EXPORT_SYMBOL_GPL(acpi_video_verify_backlight_support);
 252
 253 /* backlight device sysfs support */
 254 static int acpi_video_get_brightness(struct backlight_device *bd)
 255 {
 256         unsigned long long cur_level;
 257         int i;
 258         struct acpi_video_device *vd = bl_get_data(bd);
 259
 260         if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
 261                 return -EINVAL;
 262         for (i = 2; i < vd->brightness->count; i++) {
 263                 if (vd->brightness->levels[i] == cur_level)
 264                         /*
 265                          * The first two entries are special - see page 575
 266                          * of the ACPI spec 3.0
 267                          */
 268                         return i - 2;
 269         }
 270         return 0;
 271 }
 272
 273 static int acpi_video_set_brightness(struct backlight_device *bd)
 274 {
 275         int request_level = bd->props.brightness + 2;
 276         struct acpi_video_device *vd = bl_get_data(bd);
 277
 278         return acpi_video_device_lcd_set_level(vd,
 279                                 vd->brightness->levels[request_level]);
 280 }
 281
 282 static const struct backlight_ops acpi_backlight_ops = {
 283         .get_brightness = acpi_video_get_brightness,
 284         .update_status  = acpi_video_set_brightness,
 285 };
 286
 287 /* thermal cooling device callbacks */
 288 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
 289                                long *state)
 290 {
 291         struct acpi_device *device = cooling_dev->devdata;
 292         struct acpi_video_device *video = acpi_driver_data(device);
 293
 294         *state = video->brightness->count - 3;
 295         return 0;
 296 }
 297
 298 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
 299                                long *state)
 300 {
 301         struct acpi_device *device = cooling_dev->devdata;
 302         struct acpi_video_device *video = acpi_driver_data(device);
 303         unsigned long long level;
 304         int offset;
 305
 306         if (acpi_video_device_lcd_get_level_current(video, &level, false))
 307                 return -EINVAL;
 308         for (offset = 2; offset < video->brightness->count; offset++)
 309                 if (level == video->brightness->levels[offset]) {
 310                         *state = video->brightness->count - offset - 1;
 311                         return 0;
 312                 }
 313
 314         return -EINVAL;
 315 }
 316
 317 static int
 318 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
 319 {
 320         struct acpi_device *device = cooling_dev->devdata;
 321         struct acpi_video_device *video = acpi_driver_data(device);
 322         int level;
 323
 324         if (state >= video->brightness->count - 2)
 325                 return -EINVAL;
 326
 327         state = video->brightness->count - state;
 328         level = video->brightness->levels[state - 1];
 329         return acpi_video_device_lcd_set_level(video, level);
 330 }
 331
 332 static const struct thermal_cooling_device_ops video_cooling_ops = {
 333         .get_max_state = video_get_max_state,
 334         .get_cur_state = video_get_cur_state,
 335         .set_cur_state = video_set_cur_state,
 336 };
 337
 338 /*
 339  * --------------------------------------------------------------------------
 340  *                             Video Management
 341  * --------------------------------------------------------------------------
 342  */
 343
 344 static int
 345 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 346                                    union acpi_object **levels)
 347 {
 348         int status;
 349         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 350         union acpi_object *obj;
 351
 352
 353         *levels = NULL;
 354
 355         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 356         if (!ACPI_SUCCESS(status))
 357                 return status;
 358         obj = (union acpi_object *)buffer.pointer;
 359         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 360                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 361                 status = -EFAULT;
 362                 goto err;
 363         }
 364
 365         *levels = obj;
 366
 367         return 0;
 368
 369 err:
 370         kfree(buffer.pointer);
 371
 372         return status;
 373 }
 374
 375 static int
 376 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 377 {
 378         int status;
 379         int state;
 380
 381         status = acpi_execute_simple_method(device->dev->handle,
 382                                             "_BCM", level);
 383         if (ACPI_FAILURE(status)) {
 384                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 385                 return -EIO;
 386         }
 387
 388         device->brightness->curr = level;
 389         for (state = 2; state < device->brightness->count; state++)
 390                 if (level == device->brightness->levels[state]) {
 391                         if (device->backlight)
 392                                 device->backlight->props.brightness = state - 2;
 393                         return 0;
 394                 }
 395
 396         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 397         return -EINVAL;
 398 }
 399
 400 /*
 401  * For some buggy _BQC methods, we need to add a constant value to
 402  * the _BQC return value to get the actual current brightness level
 403  */
 404
 405 static int bqc_offset_aml_bug_workaround;
 406 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 407 {
 408         bqc_offset_aml_bug_workaround = 9;
 409         return 0;
 410 }
 411
 412 static int __init video_set_use_native_backlight(const struct dmi_system_id *d)
 413 {
 414         use_native_backlight_dmi = true;
 415         return 0;
 416 }
 417
 418 static struct dmi_system_id video_dmi_table[] __initdata = {
 419         /*
 420          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 421          */
 422         {
 423          .callback = video_set_bqc_offset,
 424          .ident = "Acer Aspire 5720",
 425          .matches = {
 426                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 427                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 428                 },
 429         },
 430         {
 431          .callback = video_set_bqc_offset,
 432          .ident = "Acer Aspire 5710Z",
 433          .matches = {
 434                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 435                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 436                 },
 437         },
 438         {
 439          .callback = video_set_bqc_offset,
 440          .ident = "eMachines E510",
 441          .matches = {
 442                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 443                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 444                 },
 445         },
 446         {
 447          .callback = video_set_bqc_offset,
 448          .ident = "Acer Aspire 5315",
 449          .matches = {
 450                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 451                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 452                 },
 453         },
 454         {
 455          .callback = video_set_bqc_offset,
 456          .ident = "Acer Aspire 7720",
 457          .matches = {
 458                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 459                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
 460                 },
 461         },
 462         {
 463          .callback = video_set_use_native_backlight,
 464          .ident = "ThinkPad T430 and T430s",
 465          .matches = {
 466                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 467                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T430"),
 468                 },
 469         },
 470         {
 471          .callback = video_set_use_native_backlight,
 472          .ident = "ThinkPad X230",
 473          .matches = {
 474                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 475                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X230"),
 476                 },
 477         },
 478         {
 479          .callback = video_set_use_native_backlight,
 480          .ident = "ThinkPad W530",
 481          .matches = {
 482                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 483                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
 484                 },
 485         },
 486         {
 487          .callback = video_set_use_native_backlight,
 488         .ident = "ThinkPad X1 Carbon",
 489         .matches = {
 490                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 491                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X1 Carbon"),
 492                 },
 493         },
 494         {
 495          .callback = video_set_use_native_backlight,
 496          .ident = "Lenovo Yoga 13",
 497          .matches = {
 498                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 499                 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"),
 500                 },
 501         },
 502         {
 503          .callback = video_set_use_native_backlight,
 504          .ident = "Lenovo Yoga 2 11",
 505          .matches = {
 506                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 507                 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 2 11"),
 508                 },
 509         },
 510         {
 511         .callback = video_set_use_native_backlight,
 512         .ident = "Thinkpad Helix",
 513         .matches = {
 514                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 515                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
 516                 },
 517         },
 518         {
 519          .callback = video_set_use_native_backlight,
 520          .ident = "Dell Inspiron 7520",
 521          .matches = {
 522                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 523                 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
 524                 },
 525         },
 526         {
 527          .callback = video_set_use_native_backlight,
 528          .ident = "Acer Aspire 5733Z",
 529          .matches = {
 530                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 531                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5733Z"),
 532                 },
 533         },
 534         {
 535          .callback = video_set_use_native_backlight,
 536          .ident = "Acer Aspire 5742G",
 537          .matches = {
 538                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 539                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5742G"),
 540                 },
 541         },
 542         {
 543          .callback = video_set_use_native_backlight,
 544          .ident = "Acer Aspire V5-171",
 545          .matches = {
 546                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 547                 DMI_MATCH(DMI_PRODUCT_NAME, "V5-171"),
 548                 },
 549         },
 550         {
 551          .callback = video_set_use_native_backlight,
 552          .ident = "Acer Aspire V5-431",
 553          .matches = {
 554                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 555                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-431"),
 556                 },
 557         },
 558         {
 559          .callback = video_set_use_native_backlight,
 560          .ident = "Acer Aspire V5-471G",
 561          .matches = {
 562                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 563                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-471G"),
 564                 },
 565         },
 566         {
 567          .callback = video_set_use_native_backlight,
 568          .ident = "Acer TravelMate B113",
 569          .matches = {
 570                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 571                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate B113"),
 572                 },
 573         },
 574         {
 575         .callback = video_set_use_native_backlight,
 576         .ident = "HP ProBook 4340s",
 577         .matches = {
 578                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 579                 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4340s"),
 580                 },
 581         },
 582         {
 583         .callback = video_set_use_native_backlight,
 584         .ident = "HP ProBook 2013 models",
 585         .matches = {
 586                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 587                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook "),
 588                 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
 589                 },
 590         },
 591         {
 592         .callback = video_set_use_native_backlight,
 593         .ident = "HP EliteBook 2013 models",
 594         .matches = {
 595                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 596                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
 597                 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
 598                 },
 599         },
 600         {
 601         .callback = video_set_use_native_backlight,
 602         .ident = "HP ZBook 14",
 603         .matches = {
 604                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 605                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 14"),
 606                 },
 607         },
 608         {
 609         .callback = video_set_use_native_backlight,
 610         .ident = "HP ZBook 15",
 611         .matches = {
 612                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 613                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 15"),
 614                 },
 615         },
 616         {
 617         .callback = video_set_use_native_backlight,
 618         .ident = "HP ZBook 17",
 619         .matches = {
 620                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 621                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 17"),
 622                 },
 623         },
 624         {
 625         .callback = video_set_use_native_backlight,
 626         .ident = "HP EliteBook 8470p",
 627         .matches = {
 628                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 629                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8470p"),
 630                 },
 631         },
 632         {
 633         .callback = video_set_use_native_backlight,
 634         .ident = "HP EliteBook 8780w",
 635         .matches = {
 636                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 637                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
 638                 },
 639         },
 640         {}
 641 };
 642
 643 static unsigned long long
 644 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
 645                               unsigned long long bqc_value)
 646 {
 647         unsigned long long level;
 648
 649         if (device->brightness->flags._BQC_use_index) {
 650                 /*
 651                  * _BQC returns an index that doesn't account for
 652                  * the first 2 items with special meaning, so we need
 653                  * to compensate for that by offsetting ourselves
 654                  */
 655                 if (device->brightness->flags._BCL_reversed)
 656                         bqc_value = device->brightness->count - 3 - bqc_value;
 657
 658                 level = device->brightness->levels[bqc_value + 2];
 659         } else {
 660                 level = bqc_value;
 661         }
 662
 663         level += bqc_offset_aml_bug_workaround;
 664
 665         return level;
 666 }
 667
 668 static int
 669 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 670                                         unsigned long long *level, bool raw)
 671 {
 672         acpi_status status = AE_OK;
 673         int i;
 674
 675         if (device->cap._BQC || device->cap._BCQ) {
 676                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 677
 678                 status = acpi_evaluate_integer(device->dev->handle, buf,
 679                                                 NULL, level);
 680                 if (ACPI_SUCCESS(status)) {
 681                         if (raw) {
 682                                 /*
 683                                  * Caller has indicated he wants the raw
 684                                  * value returned by _BQC, so don't furtherly
 685                                  * mess with the value.
 686                                  */
 687                                 return 0;
 688                         }
 689
 690                         *level = acpi_video_bqc_value_to_level(device, *level);
 691
 692                         for (i = 2; i < device->brightness->count; i++)
 693                                 if (device->brightness->levels[i] == *level) {
 694                                         device->brightness->curr = *level;
 695                                         return 0;
 696                                 }
 697                         /*
 698                          * BQC returned an invalid level.
 699                          * Stop using it.
 700                          */
 701                         ACPI_WARNING((AE_INFO,
 702                                       "%s returned an invalid level",
 703                                       buf));
 704                         device->cap._BQC = device->cap._BCQ = 0;
 705                 } else {
 706                         /*
 707                          * Fixme:
 708                          * should we return an error or ignore this failure?
 709                          * dev->brightness->curr is a cached value which stores
 710                          * the correct current backlight level in most cases.
 711                          * ACPI video backlight still works w/ buggy _BQC.
 712                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 713                          */
 714                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 715                         device->cap._BQC = device->cap._BCQ = 0;
 716                 }
 717         }
 718
 719         *level = device->brightness->curr;
 720         return 0;
 721 }
 722
 723 static int
 724 acpi_video_device_EDID(struct acpi_video_device *device,
 725                        union acpi_object **edid, ssize_t length)
 726 {
 727         int status;
 728         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 729         union acpi_object *obj;
 730         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 731         struct acpi_object_list args = { 1, &arg0 };
 732
 733
 734         *edid = NULL;
 735
 736         if (!device)
 737                 return -ENODEV;
 738         if (length == 128)
 739                 arg0.integer.value = 1;
 740         else if (length == 256)
 741                 arg0.integer.value = 2;
 742         else
 743                 return -EINVAL;
 744
 745         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 746         if (ACPI_FAILURE(status))
 747                 return -ENODEV;
 748
 749         obj = buffer.pointer;
 750
 751         if (obj && obj->type == ACPI_TYPE_BUFFER)
 752                 *edid = obj;
 753         else {
 754                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 755                 status = -EFAULT;
 756                 kfree(obj);
 757         }
 758
 759         return status;
 760 }
 761
 762 /* bus */
 763
 764 /*
 765  *  Arg:
 766  *      video           : video bus device pointer
 767  *      bios_flag       :
 768  *              0.      The system BIOS should NOT automatically switch(toggle)
 769  *                      the active display output.
 770  *              1.      The system BIOS should automatically switch (toggle) the
 771  *                      active display output. No switch event.
 772  *              2.      The _DGS value should be locked.
 773  *              3.      The system BIOS should not automatically switch (toggle) the
 774  *                      active display output, but instead generate the display switch
 775  *                      event notify code.
 776  *      lcd_flag        :
 777  *              0.      The system BIOS should automatically control the brightness level
 778  *                      of the LCD when the power changes from AC to DC
 779  *              1.      The system BIOS should NOT automatically control the brightness
 780  *                      level of the LCD when the power changes from AC to DC.
 781  *  Return Value:
 782  *              -EINVAL wrong arg.
 783  */
 784
 785 static int
 786 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 787 {
 788         acpi_status status;
 789
 790         if (!video->cap._DOS)
 791                 return 0;
 792
 793         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
 794                 return -EINVAL;
 795         video->dos_setting = (lcd_flag << 2) | bios_flag;
 796         status = acpi_execute_simple_method(video->device->handle, "_DOS",
 797                                             (lcd_flag << 2) | bios_flag);
 798         if (ACPI_FAILURE(status))
 799                 return -EIO;
 800
 801         return 0;
 802 }
 803
 804 /*
 805  * Simple comparison function used to sort backlight levels.
 806  */
 807
 808 static int
 809 acpi_video_cmp_level(const void *a, const void *b)
 810 {
 811         return *(int *)a - *(int *)b;
 812 }
 813
 814 /*
 815  * Decides if _BQC/_BCQ for this system is usable
 816  *
 817  * We do this by changing the level first and then read out the current
 818  * brightness level, if the value does not match, find out if it is using
 819  * index. If not, clear the _BQC/_BCQ capability.
 820  */
 821 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
 822                                 int max_level, int current_level)
 823 {
 824         struct acpi_video_device_brightness *br = device->brightness;
 825         int result;
 826         unsigned long long level;
 827         int test_level;
 828
 829         /* don't mess with existing known broken systems */
 830         if (bqc_offset_aml_bug_workaround)
 831                 return 0;
 832
 833         /*
 834          * Some systems always report current brightness level as maximum
 835          * through _BQC, we need to test another value for them.
 836          */
 837         test_level = current_level == max_level ? br->levels[3] : max_level;
 838
 839         result = acpi_video_device_lcd_set_level(device, test_level);
 840         if (result)
 841                 return result;
 842
 843         result = acpi_video_device_lcd_get_level_current(device, &level, true);
 844         if (result)
 845                 return result;
 846
 847         if (level != test_level) {
 848                 /* buggy _BQC found, need to find out if it uses index */
 849                 if (level < br->count) {
 850                         if (br->flags._BCL_reversed)
 851                                 level = br->count - 3 - level;
 852                         if (br->levels[level + 2] == test_level)
 853                                 br->flags._BQC_use_index = 1;
 854                 }
 855
 856                 if (!br->flags._BQC_use_index)
 857                         device->cap._BQC = device->cap._BCQ = 0;
 858         }
 859
 860         return 0;
 861 }
 862
 863
 864 /*
 865  *  Arg:
 866  *      device  : video output device (LCD, CRT, ..)
 867  *
 868  *  Return Value:
 869  *      Maximum brightness level
 870  *
 871  *  Allocate and initialize device->brightness.
 872  */
 873
 874 static int
 875 acpi_video_init_brightness(struct acpi_video_device *device)
 876 {
 877         union acpi_object *obj = NULL;
 878         int i, max_level = 0, count = 0, level_ac_battery = 0;
 879         unsigned long long level, level_old;
 880         union acpi_object *o;
 881         struct acpi_video_device_brightness *br = NULL;
 882         int result = -EINVAL;
 883         u32 value;
 884
 885         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 886                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 887                                                 "LCD brightness level\n"));
 888                 goto out;
 889         }
 890
 891         if (obj->package.count < 2)
 892                 goto out;
 893
 894         br = kzalloc(sizeof(*br), GFP_KERNEL);
 895         if (!br) {
 896                 printk(KERN_ERR "can't allocate memory\n");
 897                 result = -ENOMEM;
 898                 goto out;
 899         }
 900
 901         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 902                                 GFP_KERNEL);
 903         if (!br->levels) {
 904                 result = -ENOMEM;
 905                 goto out_free;
 906         }
 907
 908         for (i = 0; i < obj->package.count; i++) {
 909                 o = (union acpi_object *)&obj->package.elements[i];
 910                 if (o->type != ACPI_TYPE_INTEGER) {
 911                         printk(KERN_ERR PREFIX "Invalid data\n");
 912                         continue;
 913                 }
 914                 value = (u32) o->integer.value;
 915                 /* Skip duplicate entries */
 916                 if (count > 2 && br->levels[count - 1] == value)
 917                         continue;
 918
 919                 br->levels[count] = value;
 920
 921                 if (br->levels[count] > max_level)
 922                         max_level = br->levels[count];
 923                 count++;
 924         }
 925
 926         /*
 927          * some buggy BIOS don't export the levels
 928          * when machine is on AC/Battery in _BCL package.
 929          * In this case, the first two elements in _BCL packages
 930          * are also supported brightness levels that OS should take care of.
 931          */
 932         for (i = 2; i < count; i++) {
 933                 if (br->levels[i] == br->levels[0])
 934                         level_ac_battery++;
 935                 if (br->levels[i] == br->levels[1])
 936                         level_ac_battery++;
 937         }
 938
 939         if (level_ac_battery < 2) {
 940                 level_ac_battery = 2 - level_ac_battery;
 941                 br->flags._BCL_no_ac_battery_levels = 1;
 942                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 943                         br->levels[i] = br->levels[i - level_ac_battery];
 944                 count += level_ac_battery;
 945         } else if (level_ac_battery > 2)
 946                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
 947
 948         /* Check if the _BCL package is in a reversed order */
 949         if (max_level == br->levels[2]) {
 950                 br->flags._BCL_reversed = 1;
 951                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 952                         acpi_video_cmp_level, NULL);
 953         } else if (max_level != br->levels[count - 1])
 954                 ACPI_ERROR((AE_INFO,
 955                             "Found unordered _BCL package"));
 956
 957         br->count = count;
 958         device->brightness = br;
 959
 960         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 961         br->curr = level = max_level;
 962
 963         if (!device->cap._BQC)
 964                 goto set_level;
 965
 966         result = acpi_video_device_lcd_get_level_current(device,
 967                                                          &level_old, true);
 968         if (result)
 969                 goto out_free_levels;
 970
 971         result = acpi_video_bqc_quirk(device, max_level, level_old);
 972         if (result)
 973                 goto out_free_levels;
 974         /*
 975          * cap._BQC may get cleared due to _BQC is found to be broken
 976          * in acpi_video_bqc_quirk, so check again here.
 977          */
 978         if (!device->cap._BQC)
 979                 goto set_level;
 980
 981         level = acpi_video_bqc_value_to_level(device, level_old);
 982         /*
 983          * On some buggy laptops, _BQC returns an uninitialized
 984          * value when invoked for the first time, i.e.
 985          * level_old is invalid (no matter whether it's a level
 986          * or an index). Set the backlight to max_level in this case.
 987          */
 988         for (i = 2; i < br->count; i++)
 989                 if (level == br->levels[i])
 990                         break;
 991         if (i == br->count || !level)
 992                 level = max_level;
 993
 994 set_level:
 995         result = acpi_video_device_lcd_set_level(device, level);
 996         if (result)
 997                 goto out_free_levels;
 998
 999         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1000                           "found %d brightness levels\n", count - 2));
1001         kfree(obj);
1002         return result;
1003
1004 out_free_levels:
1005         kfree(br->levels);
1006 out_free:
1007         kfree(br);
1008 out:
1009         device->brightness = NULL;
1010         kfree(obj);
1011         return result;
1012 }
1013
1014 /*
1015  *  Arg:
1016  *      device  : video output device (LCD, CRT, ..)
1017  *
1018  *  Return Value:
1019  *      None
1020  *
1021  *  Find out all required AML methods defined under the output
1022  *  device.
1023  */
1024
1025 static void acpi_video_device_find_cap(struct acpi_video_device *device)
1026 {
1027         if (acpi_has_method(device->dev->handle, "_ADR"))
1028                 device->cap._ADR = 1;
1029         if (acpi_has_method(device->dev->handle, "_BCL"))
1030                 device->cap._BCL = 1;
1031         if (acpi_has_method(device->dev->handle, "_BCM"))
1032                 device->cap._BCM = 1;
1033         if (acpi_has_method(device->dev->handle, "_BQC")) {
1034                 device->cap._BQC = 1;
1035         } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
1036                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1037                 device->cap._BCQ = 1;
1038         }
1039
1040         if (acpi_has_method(device->dev->handle, "_DDC"))
1041                 device->cap._DDC = 1;
1042 }
1043
1044 /*
1045  *  Arg:
1046  *      device  : video output device (VGA)
1047  *
1048  *  Return Value:
1049  *      None
1050  *
1051  *  Find out all required AML methods defined under the video bus device.
1052  */
1053
1054 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1055 {
1056         if (acpi_has_method(video->device->handle, "_DOS"))
1057                 video->cap._DOS = 1;
1058         if (acpi_has_method(video->device->handle, "_DOD"))
1059                 video->cap._DOD = 1;
1060         if (acpi_has_method(video->device->handle, "_ROM"))
1061                 video->cap._ROM = 1;
1062         if (acpi_has_method(video->device->handle, "_GPD"))
1063                 video->cap._GPD = 1;
1064         if (acpi_has_method(video->device->handle, "_SPD"))
1065                 video->cap._SPD = 1;
1066         if (acpi_has_method(video->device->handle, "_VPO"))
1067                 video->cap._VPO = 1;
1068 }
1069
1070 /*
1071  * Check whether the video bus device has required AML method to
1072  * support the desired features
1073  */
1074
1075 static int acpi_video_bus_check(struct acpi_video_bus *video)
1076 {
1077         acpi_status status = -ENOENT;
1078         struct pci_dev *dev;
1079
1080         if (!video)
1081                 return -EINVAL;
1082
1083         dev = acpi_get_pci_dev(video->device->handle);
1084         if (!dev)
1085                 return -ENODEV;
1086         pci_dev_put(dev);
1087
1088         /*
1089          * Since there is no HID, CID and so on for VGA driver, we have
1090          * to check well known required nodes.
1091          */
1092
1093         /* Does this device support video switching? */
1094         if (video->cap._DOS || video->cap._DOD) {
1095                 if (!video->cap._DOS) {
1096                         printk(KERN_WARNING FW_BUG
1097                                 "ACPI(%s) defines _DOD but not _DOS\n",
1098                                 acpi_device_bid(video->device));
1099                 }
1100                 video->flags.multihead = 1;
1101                 status = 0;
1102         }
1103
1104         /* Does this device support retrieving a video ROM? */
1105         if (video->cap._ROM) {
1106                 video->flags.rom = 1;
1107                 status = 0;
1108         }
1109
1110         /* Does this device support configuring which video device to POST? */
1111         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1112                 video->flags.post = 1;
1113                 status = 0;
1114         }
1115
1116         return status;
1117 }
1118
1119 /*
1120  * --------------------------------------------------------------------------
1121  *                               Driver Interface
1122  * --------------------------------------------------------------------------
1123  */
1124
1125 /* device interface */
1126 static struct acpi_video_device_attrib *
1127 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1128 {
1129         struct acpi_video_enumerated_device *ids;
1130         int i;
1131
1132         for (i = 0; i < video->attached_count; i++) {
1133                 ids = &video->attached_array[i];
1134                 if ((ids->value.int_val & 0xffff) == device_id)
1135                         return &ids->value.attrib;
1136         }
1137
1138         return NULL;
1139 }
1140
1141 static int
1142 acpi_video_get_device_type(struct acpi_video_bus *video,
1143                            unsigned long device_id)
1144 {
1145         struct acpi_video_enumerated_device *ids;
1146         int i;
1147
1148         for (i = 0; i < video->attached_count; i++) {
1149                 ids = &video->attached_array[i];
1150                 if ((ids->value.int_val & 0xffff) == device_id)
1151                         return ids->value.int_val;
1152         }
1153
1154         return 0;
1155 }
1156
1157 static int
1158 acpi_video_bus_get_one_device(struct acpi_device *device,
1159                               struct acpi_video_bus *video)
1160 {
1161         unsigned long long device_id;
1162         int status, device_type;
1163         struct acpi_video_device *data;
1164         struct acpi_video_device_attrib *attribute;
1165
1166         status =
1167             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1168         /* Some device omits _ADR, we skip them instead of fail */
1169         if (ACPI_FAILURE(status))
1170                 return 0;
1171
1172         data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1173         if (!data)
1174                 return -ENOMEM;
1175
1176         strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1177         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1178         device->driver_data = data;
1179
1180         data->device_id = device_id;
1181         data->video = video;
1182         data->dev = device;
1183
1184         attribute = acpi_video_get_device_attr(video, device_id);
1185
1186         if (attribute && attribute->device_id_scheme) {
1187                 switch (attribute->display_type) {
1188                 case ACPI_VIDEO_DISPLAY_CRT:
1189                         data->flags.crt = 1;
1190                         break;
1191                 case ACPI_VIDEO_DISPLAY_TV:
1192                         data->flags.tvout = 1;
1193                         break;
1194                 case ACPI_VIDEO_DISPLAY_DVI:
1195                         data->flags.dvi = 1;
1196                         break;
1197                 case ACPI_VIDEO_DISPLAY_LCD:
1198                         data->flags.lcd = 1;
1199                         break;
1200                 default:
1201                         data->flags.unknown = 1;
1202                         break;
1203                 }
1204                 if (attribute->bios_can_detect)
1205                         data->flags.bios = 1;
1206         } else {
1207                 /* Check for legacy IDs */
1208                 device_type = acpi_video_get_device_type(video, device_id);
1209                 /* Ignore bits 16 and 18-20 */
1210                 switch (device_type & 0xffe2ffff) {
1211                 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1212                         data->flags.crt = 1;
1213                         break;
1214                 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1215                         data->flags.lcd = 1;
1216                         break;
1217                 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1218                         data->flags.tvout = 1;
1219                         break;
1220                 default:
1221                         data->flags.unknown = 1;
1222                 }
1223         }
1224
1225         acpi_video_device_bind(video, data);
1226         acpi_video_device_find_cap(data);
1227
1228         mutex_lock(&video->device_list_lock);
1229         list_add_tail(&data->entry, &video->video_device_list);
1230         mutex_unlock(&video->device_list_lock);
1231
1232         return status;
1233 }
1234
1235 /*
1236  *  Arg:
1237  *      video   : video bus device
1238  *
1239  *  Return:
1240  *      none
1241  *
1242  *  Enumerate the video device list of the video bus,
1243  *  bind the ids with the corresponding video devices
1244  *  under the video bus.
1245  */
1246
1247 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1248 {
1249         struct acpi_video_device *dev;
1250
1251         mutex_lock(&video->device_list_lock);
1252
1253         list_for_each_entry(dev, &video->video_device_list, entry)
1254                 acpi_video_device_bind(video, dev);
1255
1256         mutex_unlock(&video->device_list_lock);
1257 }
1258
1259 /*
1260  *  Arg:
1261  *      video   : video bus device
1262  *      device  : video output device under the video
1263  *              bus
1264  *
1265  *  Return:
1266  *      none
1267  *
1268  *  Bind the ids with the corresponding video devices
1269  *  under the video bus.
1270  */
1271
1272 static void
1273 acpi_video_device_bind(struct acpi_video_bus *video,
1274                        struct acpi_video_device *device)
1275 {
1276         struct acpi_video_enumerated_device *ids;
1277         int i;
1278
1279         for (i = 0; i < video->attached_count; i++) {
1280                 ids = &video->attached_array[i];
1281                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1282                         ids->bind_info = device;
1283                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1284                 }
1285         }
1286 }
1287
1288 /*
1289  *  Arg:
1290  *      video   : video bus device
1291  *
1292  *  Return:
1293  *      < 0     : error
1294  *
1295  *  Call _DOD to enumerate all devices attached to display adapter
1296  *
1297  */
1298
1299 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1300 {
1301         int status;
1302         int count;
1303         int i;
1304         struct acpi_video_enumerated_device *active_list;
1305         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1306         union acpi_object *dod = NULL;
1307         union acpi_object *obj;
1308
1309         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1310         if (!ACPI_SUCCESS(status)) {
1311                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1312                 return status;
1313         }
1314
1315         dod = buffer.pointer;
1316         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1317                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1318                 status = -EFAULT;
1319                 goto out;
1320         }
1321
1322         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1323                           dod->package.count));
1324
1325         active_list = kcalloc(1 + dod->package.count,
1326                               sizeof(struct acpi_video_enumerated_device),
1327                               GFP_KERNEL);
1328         if (!active_list) {
1329                 status = -ENOMEM;
1330                 goto out;
1331         }
1332
1333         count = 0;
1334         for (i = 0; i < dod->package.count; i++) {
1335                 obj = &dod->package.elements[i];
1336
1337                 if (obj->type != ACPI_TYPE_INTEGER) {
1338                         printk(KERN_ERR PREFIX
1339                                 "Invalid _DOD data in element %d\n", i);
1340                         continue;
1341                 }
1342
1343                 active_list[count].value.int_val = obj->integer.value;
1344                 active_list[count].bind_info = NULL;
1345                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1346                                   (int)obj->integer.value));
1347                 count++;
1348         }
1349
1350         kfree(video->attached_array);
1351
1352         video->attached_array = active_list;
1353         video->attached_count = count;
1354
1355 out:
1356         kfree(buffer.pointer);
1357         return status;
1358 }
1359
1360 static int
1361 acpi_video_get_next_level(struct acpi_video_device *device,
1362                           u32 level_current, u32 event)
1363 {
1364         int min, max, min_above, max_below, i, l, delta = 255;
1365         max = max_below = 0;
1366         min = min_above = 255;
1367         /* Find closest level to level_current */
1368         for (i = 2; i < device->brightness->count; i++) {
1369                 l = device->brightness->levels[i];
1370                 if (abs(l - level_current) < abs(delta)) {
1371                         delta = l - level_current;
1372                         if (!delta)
1373                                 break;
1374                 }
1375         }
1376         /* Ajust level_current to closest available level */
1377         level_current += delta;
1378         for (i = 2; i < device->brightness->count; i++) {
1379                 l = device->brightness->levels[i];
1380                 if (l < min)
1381                         min = l;
1382                 if (l > max)
1383                         max = l;
1384                 if (l < min_above && l > level_current)
1385                         min_above = l;
1386                 if (l > max_below && l < level_current)
1387                         max_below = l;
1388         }
1389
1390         switch (event) {
1391         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1392                 return (level_current < max) ? min_above : min;
1393         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1394                 return (level_current < max) ? min_above : max;
1395         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1396                 return (level_current > min) ? max_below : min;
1397         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1398         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1399                 return 0;
1400         default:
1401                 return level_current;
1402         }
1403 }
1404
1405 static int
1406 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1407 {
1408         unsigned long long level_current, level_next;
1409         int result = -EINVAL;
1410
1411         /* no warning message if acpi_backlight=vendor or a quirk is used */
1412         if (!acpi_video_verify_backlight_support())
1413                 return 0;
1414
1415         if (!device->brightness)
1416                 goto out;
1417
1418         result = acpi_video_device_lcd_get_level_current(device,
1419                                                          &level_current,
1420                                                          false);
1421         if (result)
1422                 goto out;
1423
1424         level_next = acpi_video_get_next_level(device, level_current, event);
1425
1426         result = acpi_video_device_lcd_set_level(device, level_next);
1427
1428         if (!result)
1429                 backlight_force_update(device->backlight,
1430                                        BACKLIGHT_UPDATE_HOTKEY);
1431
1432 out:
1433         if (result)
1434                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1435
1436         return result;
1437 }
1438
1439 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1440                         void **edid)
1441 {
1442         struct acpi_video_bus *video;
1443         struct acpi_video_device *video_device;
1444         union acpi_object *buffer = NULL;
1445         acpi_status status;
1446         int i, length;
1447
1448         if (!device || !acpi_driver_data(device))
1449                 return -EINVAL;
1450
1451         video = acpi_driver_data(device);
1452
1453         for (i = 0; i < video->attached_count; i++) {
1454                 video_device = video->attached_array[i].bind_info;
1455                 length = 256;
1456
1457                 if (!video_device)
1458                         continue;
1459
1460                 if (!video_device->cap._DDC)
1461                         continue;
1462
1463                 if (type) {
1464                         switch (type) {
1465                         case ACPI_VIDEO_DISPLAY_CRT:
1466                                 if (!video_device->flags.crt)
1467                                         continue;
1468                                 break;
1469                         case ACPI_VIDEO_DISPLAY_TV:
1470                                 if (!video_device->flags.tvout)
1471                                         continue;
1472                                 break;
1473                         case ACPI_VIDEO_DISPLAY_DVI:
1474                                 if (!video_device->flags.dvi)
1475                                         continue;
1476                                 break;
1477                         case ACPI_VIDEO_DISPLAY_LCD:
1478                                 if (!video_device->flags.lcd)
1479                                         continue;
1480                                 break;
1481                         }
1482                 } else if (video_device->device_id != device_id) {
1483                         continue;
1484                 }
1485
1486                 status = acpi_video_device_EDID(video_device, &buffer, length);
1487
1488                 if (ACPI_FAILURE(status) || !buffer ||
1489                     buffer->type != ACPI_TYPE_BUFFER) {
1490                         length = 128;
1491                         status = acpi_video_device_EDID(video_device, &buffer,
1492                                                         length);
1493                         if (ACPI_FAILURE(status) || !buffer ||
1494                             buffer->type != ACPI_TYPE_BUFFER) {
1495                                 continue;
1496                         }
1497                 }
1498
1499                 *edid = buffer->buffer.pointer;
1500                 return length;
1501         }
1502
1503         return -ENODEV;
1504 }
1505 EXPORT_SYMBOL(acpi_video_get_edid);
1506
1507 static int
1508 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1509                            struct acpi_device *device)
1510 {
1511         int status = 0;
1512         struct acpi_device *dev;
1513
1514         /*
1515          * There are systems where video module known to work fine regardless
1516          * of broken _DOD and ignoring returned value here doesn't cause
1517          * any issues later.
1518          */
1519         acpi_video_device_enumerate(video);
1520
1521         list_for_each_entry(dev, &device->children, node) {
1522
1523                 status = acpi_video_bus_get_one_device(dev, video);
1524                 if (status) {
1525                         dev_err(&dev->dev, "Can't attach device\n");
1526                         break;
1527                 }
1528         }
1529         return status;
1530 }
1531
1532 /* acpi_video interface */
1533
1534 /*
1535  * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1536  * preform any automatic brightness change on receiving a notification.
1537  */
1538 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1539 {
1540         return acpi_video_bus_DOS(video, 0,
1541                                   acpi_osi_is_win8() ? 1 : 0);
1542 }
1543
1544 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1545 {
1546         return acpi_video_bus_DOS(video, 0,
1547                                   acpi_osi_is_win8() ? 0 : 1);
1548 }
1549
1550 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1551 {
1552         struct acpi_video_bus *video = acpi_driver_data(device);
1553         struct input_dev *input;
1554         int keycode = 0;
1555
1556         if (!video || !video->input)
1557                 return;
1558
1559         input = video->input;
1560
1561         switch (event) {
1562         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1563                                          * most likely via hotkey. */
1564                 keycode = KEY_SWITCHVIDEOMODE;
1565                 break;
1566
1567         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1568                                          * connector. */
1569                 acpi_video_device_enumerate(video);
1570                 acpi_video_device_rebind(video);
1571                 keycode = KEY_SWITCHVIDEOMODE;
1572                 break;
1573
1574         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1575                 keycode = KEY_SWITCHVIDEOMODE;
1576                 break;
1577         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1578                 keycode = KEY_VIDEO_NEXT;
1579                 break;
1580         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1581                 keycode = KEY_VIDEO_PREV;
1582                 break;
1583
1584         default:
1585                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1586                                   "Unsupported event [0x%x]\n", event));
1587                 break;
1588         }
1589
1590         if (acpi_notifier_call_chain(device, event, 0))
1591                 /* Something vetoed the keypress. */
1592                 keycode = 0;
1593
1594         if (keycode) {
1595                 input_report_key(input, keycode, 1);
1596                 input_sync(input);
1597                 input_report_key(input, keycode, 0);
1598                 input_sync(input);
1599         }
1600
1601         return;
1602 }
1603
1604 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1605 {
1606         struct acpi_video_device *video_device = data;
1607         struct acpi_device *device = NULL;
1608         struct acpi_video_bus *bus;
1609         struct input_dev *input;
1610         int keycode = 0;
1611
1612         if (!video_device)
1613                 return;
1614
1615         device = video_device->dev;
1616         bus = video_device->video;
1617         input = bus->input;
1618
1619         switch (event) {
1620         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1621                 if (brightness_switch_enabled)
1622                         acpi_video_switch_brightness(video_device, event);
1623                 keycode = KEY_BRIGHTNESS_CYCLE;
1624                 break;
1625         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1626                 if (brightness_switch_enabled)
1627                         acpi_video_switch_brightness(video_device, event);
1628                 keycode = KEY_BRIGHTNESSUP;
1629                 break;
1630         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1631                 if (brightness_switch_enabled)
1632                         acpi_video_switch_brightness(video_device, event);
1633                 keycode = KEY_BRIGHTNESSDOWN;
1634                 break;
1635         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1636                 if (brightness_switch_enabled)
1637                         acpi_video_switch_brightness(video_device, event);
1638                 keycode = KEY_BRIGHTNESS_ZERO;
1639                 break;
1640         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1641                 if (brightness_switch_enabled)
1642                         acpi_video_switch_brightness(video_device, event);
1643                 keycode = KEY_DISPLAY_OFF;
1644                 break;
1645         default:
1646                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1647                                   "Unsupported event [0x%x]\n", event));
1648                 break;
1649         }
1650
1651         acpi_notifier_call_chain(device, event, 0);
1652
1653         if (keycode) {
1654                 input_report_key(input, keycode, 1);
1655                 input_sync(input);
1656                 input_report_key(input, keycode, 0);
1657                 input_sync(input);
1658         }
1659
1660         return;
1661 }
1662
1663 static int acpi_video_resume(struct notifier_block *nb,
1664                                 unsigned long val, void *ign)
1665 {
1666         struct acpi_video_bus *video;
1667         struct acpi_video_device *video_device;
1668         int i;
1669
1670         switch (val) {
1671         case PM_HIBERNATION_PREPARE:
1672         case PM_SUSPEND_PREPARE:
1673         case PM_RESTORE_PREPARE:
1674                 return NOTIFY_DONE;
1675         }
1676
1677         video = container_of(nb, struct acpi_video_bus, pm_nb);
1678
1679         dev_info(&video->device->dev, "Restoring backlight state\n");
1680
1681         for (i = 0; i < video->attached_count; i++) {
1682                 video_device = video->attached_array[i].bind_info;
1683                 if (video_device && video_device->backlight)
1684                         acpi_video_set_brightness(video_device->backlight);
1685         }
1686
1687         return NOTIFY_OK;
1688 }
1689
1690 static acpi_status
1691 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1692                         void **return_value)
1693 {
1694         struct acpi_device *device = context;
1695         struct acpi_device *sibling;
1696         int result;
1697
1698         if (handle == device->handle)
1699                 return AE_CTRL_TERMINATE;
1700
1701         result = acpi_bus_get_device(handle, &sibling);
1702         if (result)
1703                 return AE_OK;
1704
1705         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1706                         return AE_ALREADY_EXISTS;
1707
1708         return AE_OK;
1709 }
1710
1711 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1712 {
1713         struct backlight_properties props;
1714         struct pci_dev *pdev;
1715         acpi_handle acpi_parent;
1716         struct device *parent = NULL;
1717         int result;
1718         static int count;
1719         char *name;
1720
1721         result = acpi_video_init_brightness(device);
1722         if (result)
1723                 return;
1724         name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1725         if (!name)
1726                 return;
1727         count++;
1728
1729         acpi_get_parent(device->dev->handle, &acpi_parent);
1730
1731         pdev = acpi_get_pci_dev(acpi_parent);
1732         if (pdev) {
1733                 parent = &pdev->dev;
1734                 pci_dev_put(pdev);
1735         }
1736
1737         memset(&props, 0, sizeof(struct backlight_properties));
1738         props.type = BACKLIGHT_FIRMWARE;
1739         props.max_brightness = device->brightness->count - 3;
1740         device->backlight = backlight_device_register(name,
1741                                                       parent,
1742                                                       device,
1743                                                       &acpi_backlight_ops,
1744                                                       &props);
1745         kfree(name);
1746         if (IS_ERR(device->backlight))
1747                 return;
1748
1749         /*
1750          * Save current brightness level in case we have to restore it
1751          * before acpi_video_device_lcd_set_level() is called next time.
1752          */
1753         device->backlight->props.brightness =
1754                         acpi_video_get_brightness(device->backlight);
1755
1756         device->cooling_dev = thermal_cooling_device_register("LCD",
1757                                 device->dev, &video_cooling_ops);
1758         if (IS_ERR(device->cooling_dev)) {
1759                 /*
1760                  * Set cooling_dev to NULL so we don't crash trying to free it.
1761                  * Also, why the hell we are returning early and not attempt to
1762                  * register video output if cooling device registration failed?
1763                  * -- dtor
1764                  */
1765                 device->cooling_dev = NULL;
1766                 return;
1767         }
1768
1769         dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1770                  device->cooling_dev->id);
1771         result = sysfs_create_link(&device->dev->dev.kobj,
1772                         &device->cooling_dev->device.kobj,
1773                         "thermal_cooling");
1774         if (result)
1775                 printk(KERN_ERR PREFIX "Create sysfs link\n");
1776         result = sysfs_create_link(&device->cooling_dev->device.kobj,
1777                         &device->dev->dev.kobj, "device");
1778         if (result)
1779                 printk(KERN_ERR PREFIX "Create sysfs link\n");
1780 }
1781
1782 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1783 {
1784         struct acpi_video_device *dev;
1785
1786         if (video->backlight_registered)
1787                 return 0;
1788
1789         if (!acpi_video_verify_backlight_support())
1790                 return 0;
1791
1792         mutex_lock(&video->device_list_lock);
1793         list_for_each_entry(dev, &video->video_device_list, entry)
1794                 acpi_video_dev_register_backlight(dev);
1795         mutex_unlock(&video->device_list_lock);
1796
1797         video->backlight_registered = true;
1798
1799         video->pm_nb.notifier_call = acpi_video_resume;
1800         video->pm_nb.priority = 0;
1801         return register_pm_notifier(&video->pm_nb);
1802 }
1803
1804 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1805 {
1806         if (device->backlight) {
1807                 backlight_device_unregister(device->backlight);
1808                 device->backlight = NULL;
1809         }
1810         if (device->brightness) {
1811                 kfree(device->brightness->levels);
1812                 kfree(device->brightness);
1813                 device->brightness = NULL;
1814         }
1815         if (device->cooling_dev) {
1816                 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1817                 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1818                 thermal_cooling_device_unregister(device->cooling_dev);
1819                 device->cooling_dev = NULL;
1820         }
1821 }
1822
1823 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1824 {
1825         struct acpi_video_device *dev;
1826         int error;
1827
1828         if (!video->backlight_registered)
1829                 return 0;
1830
1831         error = unregister_pm_notifier(&video->pm_nb);
1832
1833         mutex_lock(&video->device_list_lock);
1834         list_for_each_entry(dev, &video->video_device_list, entry)
1835                 acpi_video_dev_unregister_backlight(dev);
1836         mutex_unlock(&video->device_list_lock);
1837
1838         video->backlight_registered = false;
1839
1840         return error;
1841 }
1842
1843 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1844 {
1845         acpi_status status;
1846         struct acpi_device *adev = device->dev;
1847
1848         status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1849                                              acpi_video_device_notify, device);
1850         if (ACPI_FAILURE(status))
1851                 dev_err(&adev->dev, "Error installing notify handler\n");
1852         else
1853                 device->flags.notify = 1;
1854 }
1855
1856 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1857 {
1858         struct input_dev *input;
1859         struct acpi_video_device *dev;
1860         int error;
1861
1862         video->input = input = input_allocate_device();
1863         if (!input) {
1864                 error = -ENOMEM;
1865                 goto out;
1866         }
1867
1868         error = acpi_video_bus_start_devices(video);
1869         if (error)
1870                 goto err_free_input;
1871
1872         snprintf(video->phys, sizeof(video->phys),
1873                         "%s/video/input0", acpi_device_hid(video->device));
1874
1875         input->name = acpi_device_name(video->device);
1876         input->phys = video->phys;
1877         input->id.bustype = BUS_HOST;
1878         input->id.product = 0x06;
1879         input->dev.parent = &video->device->dev;
1880         input->evbit[0] = BIT(EV_KEY);
1881         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1882         set_bit(KEY_VIDEO_NEXT, input->keybit);
1883         set_bit(KEY_VIDEO_PREV, input->keybit);
1884         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1885         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1886         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1887         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1888         set_bit(KEY_DISPLAY_OFF, input->keybit);
1889
1890         error = input_register_device(input);
1891         if (error)
1892                 goto err_stop_dev;
1893
1894         mutex_lock(&video->device_list_lock);
1895         list_for_each_entry(dev, &video->video_device_list, entry)
1896                 acpi_video_dev_add_notify_handler(dev);
1897         mutex_unlock(&video->device_list_lock);
1898
1899         return 0;
1900
1901 err_stop_dev:
1902         acpi_video_bus_stop_devices(video);
1903 err_free_input:
1904         input_free_device(input);
1905         video->input = NULL;
1906 out:
1907         return error;
1908 }
1909
1910 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1911 {
1912         if (dev->flags.notify) {
1913                 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1914                                            acpi_video_device_notify);
1915                 dev->flags.notify = 0;
1916         }
1917 }
1918
1919 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1920 {
1921         struct acpi_video_device *dev;
1922
1923         mutex_lock(&video->device_list_lock);
1924         list_for_each_entry(dev, &video->video_device_list, entry)
1925                 acpi_video_dev_remove_notify_handler(dev);
1926         mutex_unlock(&video->device_list_lock);
1927
1928         acpi_video_bus_stop_devices(video);
1929         input_unregister_device(video->input);
1930         video->input = NULL;
1931 }
1932
1933 static int acpi_video_backlight_notify(struct notifier_block *nb,
1934                                         unsigned long val, void *bd)
1935 {
1936         struct backlight_device *backlight = bd;
1937         struct acpi_video_bus *video;
1938
1939         /* acpi_video_verify_backlight_support only cares about raw devices */
1940         if (backlight->props.type != BACKLIGHT_RAW)
1941                 return NOTIFY_DONE;
1942
1943         video = container_of(nb, struct acpi_video_bus, backlight_nb);
1944
1945         switch (val) {
1946         case BACKLIGHT_REGISTERED:
1947                 if (!acpi_video_verify_backlight_support())
1948                         acpi_video_bus_unregister_backlight(video);
1949                 break;
1950         case BACKLIGHT_UNREGISTERED:
1951                 acpi_video_bus_register_backlight(video);
1952                 break;
1953         }
1954
1955         return NOTIFY_OK;
1956 }
1957
1958 static int acpi_video_bus_add_backlight_notify_handler(
1959                                                 struct acpi_video_bus *video)
1960 {
1961         int error;
1962
1963         video->backlight_nb.notifier_call = acpi_video_backlight_notify;
1964         video->backlight_nb.priority = 0;
1965         error = backlight_register_notifier(&video->backlight_nb);
1966         if (error == 0)
1967                 video->backlight_notifier_registered = true;
1968
1969         return error;
1970 }
1971
1972 static int acpi_video_bus_remove_backlight_notify_handler(
1973                                                 struct acpi_video_bus *video)
1974 {
1975         if (!video->backlight_notifier_registered)
1976                 return 0;
1977
1978         video->backlight_notifier_registered = false;
1979
1980         return backlight_unregister_notifier(&video->backlight_nb);
1981 }
1982
1983 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1984 {
1985         struct acpi_video_device *dev, *next;
1986
1987         mutex_lock(&video->device_list_lock);
1988         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1989                 list_del(&dev->entry);
1990                 kfree(dev);
1991         }
1992         mutex_unlock(&video->device_list_lock);
1993
1994         return 0;
1995 }
1996
1997 static int instance;
1998
1999 static int acpi_video_bus_add(struct acpi_device *device)
2000 {
2001         struct acpi_video_bus *video;
2002         int error;
2003         acpi_status status;
2004
2005         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2006                                 device->parent->handle, 1,
2007                                 acpi_video_bus_match, NULL,
2008                                 device, NULL);
2009         if (status == AE_ALREADY_EXISTS) {
2010                 printk(KERN_WARNING FW_BUG
2011                         "Duplicate ACPI video bus devices for the"
2012                         " same VGA controller, please try module "
2013                         "parameter \"video.allow_duplicates=1\""
2014                         "if the current driver doesn't work.\n");
2015                 if (!allow_duplicates)
2016                         return -ENODEV;
2017         }
2018
2019         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2020         if (!video)
2021                 return -ENOMEM;
2022
2023         /* a hack to fix the duplicate name "VID" problem on T61 */
2024         if (!strcmp(device->pnp.bus_id, "VID")) {
2025                 if (instance)
2026                         device->pnp.bus_id[3] = '0' + instance;
2027                 instance++;
2028         }
2029         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2030         if (!strcmp(device->pnp.bus_id, "VGA")) {
2031                 if (instance)
2032                         device->pnp.bus_id[3] = '0' + instance;
2033                 instance++;
2034         }
2035
2036         video->device = device;
2037         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2038         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2039         device->driver_data = video;
2040
2041         acpi_video_bus_find_cap(video);
2042         error = acpi_video_bus_check(video);
2043         if (error)
2044                 goto err_free_video;
2045
2046         mutex_init(&video->device_list_lock);
2047         INIT_LIST_HEAD(&video->video_device_list);
2048
2049         error = acpi_video_bus_get_devices(video, device);
2050         if (error)
2051                 goto err_put_video;
2052
2053         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2054                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2055                video->flags.multihead ? "yes" : "no",
2056                video->flags.rom ? "yes" : "no",
2057                video->flags.post ? "yes" : "no");
2058         mutex_lock(&video_list_lock);
2059         list_add_tail(&video->entry, &video_bus_head);
2060         mutex_unlock(&video_list_lock);
2061
2062         acpi_video_bus_register_backlight(video);
2063         acpi_video_bus_add_notify_handler(video);
2064         acpi_video_bus_add_backlight_notify_handler(video);
2065
2066         return 0;
2067
2068 err_put_video:
2069         acpi_video_bus_put_devices(video);
2070         kfree(video->attached_array);
2071 err_free_video:
2072         kfree(video);
2073         device->driver_data = NULL;
2074
2075         return error;
2076 }
2077
2078 static int acpi_video_bus_remove(struct acpi_device *device)
2079 {
2080         struct acpi_video_bus *video = NULL;
2081
2082
2083         if (!device || !acpi_driver_data(device))
2084                 return -EINVAL;
2085
2086         video = acpi_driver_data(device);
2087
2088         acpi_video_bus_remove_backlight_notify_handler(video);
2089         acpi_video_bus_remove_notify_handler(video);
2090         acpi_video_bus_unregister_backlight(video);
2091         acpi_video_bus_put_devices(video);
2092
2093         mutex_lock(&video_list_lock);
2094         list_del(&video->entry);
2095         mutex_unlock(&video_list_lock);
2096
2097         kfree(video->attached_array);
2098         kfree(video);
2099
2100         return 0;
2101 }
2102
2103 static int __init is_i740(struct pci_dev *dev)
2104 {
2105         if (dev->device == 0x00D1)
2106                 return 1;
2107         if (dev->device == 0x7000)
2108                 return 1;
2109         return 0;
2110 }
2111
2112 static int __init intel_opregion_present(void)
2113 {
2114         int opregion = 0;
2115         struct pci_dev *dev = NULL;
2116         u32 address;
2117
2118         for_each_pci_dev(dev) {
2119                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2120                         continue;
2121                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2122                         continue;
2123                 /* We don't want to poke around undefined i740 registers */
2124                 if (is_i740(dev))
2125                         continue;
2126                 pci_read_config_dword(dev, 0xfc, &address);
2127                 if (!address)
2128                         continue;
2129                 opregion = 1;
2130         }
2131         return opregion;
2132 }
2133
2134 int acpi_video_register(void)
2135 {
2136         int result = 0;
2137         if (register_count) {
2138                 /*
2139                  * if the function of acpi_video_register is already called,
2140                  * don't register the acpi_vide_bus again and return no error.
2141                  */
2142                 return 0;
2143         }
2144
2145         mutex_init(&video_list_lock);
2146         INIT_LIST_HEAD(&video_bus_head);
2147
2148         result = acpi_bus_register_driver(&acpi_video_bus);
2149         if (result < 0)
2150                 return -ENODEV;
2151
2152         /*
2153          * When the acpi_video_bus is loaded successfully, increase
2154          * the counter reference.
2155          */
2156         register_count = 1;
2157
2158         return 0;
2159 }
2160 EXPORT_SYMBOL(acpi_video_register);
2161
2162 void acpi_video_unregister(void)
2163 {
2164         if (!register_count) {
2165                 /*
2166                  * If the acpi video bus is already unloaded, don't
2167                  * unload it again and return directly.
2168                  */
2169                 return;
2170         }
2171         acpi_bus_unregister_driver(&acpi_video_bus);
2172
2173         register_count = 0;
2174
2175         return;
2176 }
2177 EXPORT_SYMBOL(acpi_video_unregister);
2178
2179 void acpi_video_unregister_backlight(void)
2180 {
2181         struct acpi_video_bus *video;
2182
2183         if (!register_count)
2184                 return;
2185
2186         mutex_lock(&video_list_lock);
2187         list_for_each_entry(video, &video_bus_head, entry)
2188                 acpi_video_bus_unregister_backlight(video);
2189         mutex_unlock(&video_list_lock);
2190 }
2191 EXPORT_SYMBOL(acpi_video_unregister_backlight);
2192
2193 /*
2194  * This is kind of nasty. Hardware using Intel chipsets may require
2195  * the video opregion code to be run first in order to initialise
2196  * state before any ACPI video calls are made. To handle this we defer
2197  * registration of the video class until the opregion code has run.
2198  */
2199
2200 static int __init acpi_video_init(void)
2201 {
2202         dmi_check_system(video_dmi_table);
2203
2204         if (intel_opregion_present())
2205                 return 0;
2206
2207         return acpi_video_register();
2208 }
2209
2210 static void __exit acpi_video_exit(void)
2211 {
2212         acpi_video_unregister();
2213
2214         return;
2215 }
2216
2217 module_init(acpi_video_init);
2218 module_exit(acpi_video_exit);