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 = 1;
  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 = true;
  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 delayed_work switch_brightness_work;
 208         int switch_brightness_event;
 209         struct acpi_video_bus *video;
 210         struct acpi_device *dev;
 211         struct acpi_video_device_brightness *brightness;
 212         struct backlight_device *backlight;
 213         struct thermal_cooling_device *cooling_dev;
 214 };
 215
 216 static const char device_decode[][30] = {
 217         "motherboard VGA device",
 218         "PCI VGA device",
 219         "AGP VGA device",
 220         "UNKNOWN",
 221 };
 222
 223 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 224 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 225 static void acpi_video_device_bind(struct acpi_video_bus *video,
 226                                    struct acpi_video_device *device);
 227 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 228 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 229                         int level);
 230 static int acpi_video_device_lcd_get_level_current(
 231                         struct acpi_video_device *device,
 232                         unsigned long long *level, bool raw);
 233 static int acpi_video_get_next_level(struct acpi_video_device *device,
 234                                      u32 level_current, u32 event);
 235 static void acpi_video_switch_brightness(struct work_struct *work);
 236
 237 static bool acpi_video_use_native_backlight(void)
 238 {
 239         if (use_native_backlight_param != -1)
 240                 return use_native_backlight_param;
 241         else
 242                 return use_native_backlight_dmi;
 243 }
 244
 245 bool acpi_video_verify_backlight_support(void)
 246 {
 247         if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
 248             backlight_device_registered(BACKLIGHT_RAW))
 249                 return false;
 250         return acpi_video_backlight_support();
 251 }
 252 EXPORT_SYMBOL_GPL(acpi_video_verify_backlight_support);
 253
 254 /* backlight device sysfs support */
 255 static int acpi_video_get_brightness(struct backlight_device *bd)
 256 {
 257         unsigned long long cur_level;
 258         int i;
 259         struct acpi_video_device *vd = bl_get_data(bd);
 260
 261         if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
 262                 return -EINVAL;
 263         for (i = 2; i < vd->brightness->count; i++) {
 264                 if (vd->brightness->levels[i] == cur_level)
 265                         /*
 266                          * The first two entries are special - see page 575
 267                          * of the ACPI spec 3.0
 268                          */
 269                         return i - 2;
 270         }
 271         return 0;
 272 }
 273
 274 static int acpi_video_set_brightness(struct backlight_device *bd)
 275 {
 276         int request_level = bd->props.brightness + 2;
 277         struct acpi_video_device *vd = bl_get_data(bd);
 278
 279         cancel_delayed_work(&vd->switch_brightness_work);
 280         return acpi_video_device_lcd_set_level(vd,
 281                                 vd->brightness->levels[request_level]);
 282 }
 283
 284 static const struct backlight_ops acpi_backlight_ops = {
 285         .get_brightness = acpi_video_get_brightness,
 286         .update_status  = acpi_video_set_brightness,
 287 };
 288
 289 /* thermal cooling device callbacks */
 290 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
 291                                long *state)
 292 {
 293         struct acpi_device *device = cooling_dev->devdata;
 294         struct acpi_video_device *video = acpi_driver_data(device);
 295
 296         *state = video->brightness->count - 3;
 297         return 0;
 298 }
 299
 300 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
 301                                long *state)
 302 {
 303         struct acpi_device *device = cooling_dev->devdata;
 304         struct acpi_video_device *video = acpi_driver_data(device);
 305         unsigned long long level;
 306         int offset;
 307
 308         if (acpi_video_device_lcd_get_level_current(video, &level, false))
 309                 return -EINVAL;
 310         for (offset = 2; offset < video->brightness->count; offset++)
 311                 if (level == video->brightness->levels[offset]) {
 312                         *state = video->brightness->count - offset - 1;
 313                         return 0;
 314                 }
 315
 316         return -EINVAL;
 317 }
 318
 319 static int
 320 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
 321 {
 322         struct acpi_device *device = cooling_dev->devdata;
 323         struct acpi_video_device *video = acpi_driver_data(device);
 324         int level;
 325
 326         if (state >= video->brightness->count - 2)
 327                 return -EINVAL;
 328
 329         state = video->brightness->count - state;
 330         level = video->brightness->levels[state - 1];
 331         return acpi_video_device_lcd_set_level(video, level);
 332 }
 333
 334 static const struct thermal_cooling_device_ops video_cooling_ops = {
 335         .get_max_state = video_get_max_state,
 336         .get_cur_state = video_get_cur_state,
 337         .set_cur_state = video_set_cur_state,
 338 };
 339
 340 /*
 341  * --------------------------------------------------------------------------
 342  *                             Video Management
 343  * --------------------------------------------------------------------------
 344  */
 345
 346 static int
 347 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 348                                    union acpi_object **levels)
 349 {
 350         int status;
 351         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 352         union acpi_object *obj;
 353
 354
 355         *levels = NULL;
 356
 357         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 358         if (!ACPI_SUCCESS(status))
 359                 return status;
 360         obj = (union acpi_object *)buffer.pointer;
 361         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 362                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 363                 status = -EFAULT;
 364                 goto err;
 365         }
 366
 367         *levels = obj;
 368
 369         return 0;
 370
 371 err:
 372         kfree(buffer.pointer);
 373
 374         return status;
 375 }
 376
 377 static int
 378 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 379 {
 380         int status;
 381         int state;
 382
 383         status = acpi_execute_simple_method(device->dev->handle,
 384                                             "_BCM", level);
 385         if (ACPI_FAILURE(status)) {
 386                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 387                 return -EIO;
 388         }
 389
 390         device->brightness->curr = level;
 391         for (state = 2; state < device->brightness->count; state++)
 392                 if (level == device->brightness->levels[state]) {
 393                         if (device->backlight)
 394                                 device->backlight->props.brightness = state - 2;
 395                         return 0;
 396                 }
 397
 398         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 399         return -EINVAL;
 400 }
 401
 402 /*
 403  * For some buggy _BQC methods, we need to add a constant value to
 404  * the _BQC return value to get the actual current brightness level
 405  */
 406
 407 static int bqc_offset_aml_bug_workaround;
 408 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 409 {
 410         bqc_offset_aml_bug_workaround = 9;
 411         return 0;
 412 }
 413
 414 static int __init video_set_use_native_backlight(const struct dmi_system_id *d)
 415 {
 416         use_native_backlight_dmi = true;
 417         return 0;
 418 }
 419
 420 static int __init video_disable_native_backlight(const struct dmi_system_id *d)
 421 {
 422         use_native_backlight_dmi = false;
 423         return 0;
 424 }
 425
 426 static struct dmi_system_id video_dmi_table[] __initdata = {
 427         /*
 428          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 429          */
 430         {
 431          .callback = video_set_bqc_offset,
 432          .ident = "Acer Aspire 5720",
 433          .matches = {
 434                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 435                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 436                 },
 437         },
 438         {
 439          .callback = video_set_bqc_offset,
 440          .ident = "Acer Aspire 5710Z",
 441          .matches = {
 442                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 443                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 444                 },
 445         },
 446         {
 447          .callback = video_set_bqc_offset,
 448          .ident = "eMachines E510",
 449          .matches = {
 450                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 451                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 452                 },
 453         },
 454         {
 455          .callback = video_set_bqc_offset,
 456          .ident = "Acer Aspire 5315",
 457          .matches = {
 458                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 459                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 460                 },
 461         },
 462         {
 463          .callback = video_set_bqc_offset,
 464          .ident = "Acer Aspire 7720",
 465          .matches = {
 466                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 467                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
 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 T430 and T430s",
 481          .matches = {
 482                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 483                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T430"),
 484                 },
 485         },
 486         {
 487          .callback = video_set_use_native_backlight,
 488          .ident = "ThinkPad T430",
 489          .matches = {
 490                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 491                 DMI_MATCH(DMI_PRODUCT_VERSION, "2349D15"),
 492                 },
 493         },
 494         {
 495          .callback = video_set_use_native_backlight,
 496          .ident = "ThinkPad T431s",
 497          .matches = {
 498                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 499                 DMI_MATCH(DMI_PRODUCT_VERSION, "20AACTO1WW"),
 500                 },
 501         },
 502         {
 503          .callback = video_set_use_native_backlight,
 504          .ident = "ThinkPad Edge E530",
 505          .matches = {
 506                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 507                 DMI_MATCH(DMI_PRODUCT_VERSION, "3259A2G"),
 508                 },
 509         },
 510         {
 511          .callback = video_set_use_native_backlight,
 512          .ident = "ThinkPad Edge E530",
 513          .matches = {
 514                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 515                 DMI_MATCH(DMI_PRODUCT_VERSION, "3259CTO"),
 516                 },
 517         },
 518         {
 519          .callback = video_set_use_native_backlight,
 520          .ident = "ThinkPad Edge E530",
 521          .matches = {
 522                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 523                 DMI_MATCH(DMI_PRODUCT_VERSION, "3259HJG"),
 524                 },
 525         },
 526         {
 527          .callback = video_set_use_native_backlight,
 528          .ident = "ThinkPad W530",
 529          .matches = {
 530                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 531                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
 532                 },
 533         },
 534         {
 535          .callback = video_set_use_native_backlight,
 536         .ident = "ThinkPad X1 Carbon",
 537         .matches = {
 538                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 539                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X1 Carbon"),
 540                 },
 541         },
 542         {
 543          .callback = video_set_use_native_backlight,
 544          .ident = "Lenovo Yoga 13",
 545          .matches = {
 546                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 547                 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Yoga 13"),
 548                 },
 549         },
 550         {
 551          .callback = video_set_use_native_backlight,
 552          .ident = "Lenovo Yoga 2 11",
 553          .matches = {
 554                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 555                 DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Yoga 2 11"),
 556                 },
 557         },
 558         {
 559         .callback = video_set_use_native_backlight,
 560         .ident = "Thinkpad Helix",
 561         .matches = {
 562                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 563                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
 564                 },
 565         },
 566         {
 567          .callback = video_set_use_native_backlight,
 568          .ident = "Dell Inspiron 7520",
 569          .matches = {
 570                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 571                 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
 572                 },
 573         },
 574         {
 575          .callback = video_set_use_native_backlight,
 576          .ident = "Acer Aspire 5733Z",
 577          .matches = {
 578                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 579                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5733Z"),
 580                 },
 581         },
 582         {
 583          .callback = video_set_use_native_backlight,
 584          .ident = "Acer Aspire 5742G",
 585          .matches = {
 586                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 587                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5742G"),
 588                 },
 589         },
 590         {
 591          .callback = video_set_use_native_backlight,
 592          .ident = "Acer Aspire V5-171",
 593          .matches = {
 594                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 595                 DMI_MATCH(DMI_PRODUCT_NAME, "V5-171"),
 596                 },
 597         },
 598         {
 599          .callback = video_set_use_native_backlight,
 600          .ident = "Acer Aspire V5-431",
 601          .matches = {
 602                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 603                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-431"),
 604                 },
 605         },
 606         {
 607          .callback = video_set_use_native_backlight,
 608          .ident = "Acer Aspire V5-471G",
 609          .matches = {
 610                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 611                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-471G"),
 612                 },
 613         },
 614         {
 615          .callback = video_set_use_native_backlight,
 616          .ident = "Acer TravelMate B113",
 617          .matches = {
 618                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 619                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate B113"),
 620                 },
 621         },
 622         {
 623          .callback = video_set_use_native_backlight,
 624          .ident = "Acer Aspire V5-572G",
 625          .matches = {
 626                 DMI_MATCH(DMI_SYS_VENDOR, "Acer Aspire"),
 627                 DMI_MATCH(DMI_PRODUCT_VERSION, "V5-572G/Dazzle_CX"),
 628                 },
 629         },
 630         {
 631          .callback = video_set_use_native_backlight,
 632          .ident = "Acer Aspire V5-573G",
 633          .matches = {
 634                 DMI_MATCH(DMI_SYS_VENDOR, "Acer Aspire"),
 635                 DMI_MATCH(DMI_PRODUCT_VERSION, "V5-573G/Dazzle_HW"),
 636                 },
 637         },
 638         {
 639          .callback = video_set_use_native_backlight,
 640          .ident = "ASUS Zenbook Prime UX31A",
 641          .matches = {
 642                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 643                 DMI_MATCH(DMI_PRODUCT_NAME, "UX31A"),
 644                 },
 645         },
 646         {
 647         .callback = video_set_use_native_backlight,
 648         .ident = "HP ProBook 4340s",
 649         .matches = {
 650                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 651                 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4340s"),
 652                 },
 653         },
 654         {
 655         .callback = video_set_use_native_backlight,
 656         .ident = "HP ProBook 4540s",
 657         .matches = {
 658                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 659                 DMI_MATCH(DMI_PRODUCT_VERSION, "HP ProBook 4540s"),
 660                 },
 661         },
 662         {
 663         .callback = video_set_use_native_backlight,
 664         .ident = "HP ProBook 2013 models",
 665         .matches = {
 666                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 667                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ProBook "),
 668                 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
 669                 },
 670         },
 671         {
 672         .callback = video_set_use_native_backlight,
 673         .ident = "HP EliteBook 2013 models",
 674         .matches = {
 675                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 676                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
 677                 DMI_MATCH(DMI_PRODUCT_NAME, " G1"),
 678                 },
 679         },
 680         {
 681         .callback = video_set_use_native_backlight,
 682         .ident = "HP EliteBook 2014 models",
 683         .matches = {
 684                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 685                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook "),
 686                 DMI_MATCH(DMI_PRODUCT_NAME, " G2"),
 687                 },
 688         },
 689         {
 690         .callback = video_set_use_native_backlight,
 691         .ident = "HP ZBook 14",
 692         .matches = {
 693                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 694                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 14"),
 695                 },
 696         },
 697         {
 698         .callback = video_set_use_native_backlight,
 699         .ident = "HP ZBook 15",
 700         .matches = {
 701                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 702                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 15"),
 703                 },
 704         },
 705         {
 706         .callback = video_set_use_native_backlight,
 707         .ident = "HP ZBook 17",
 708         .matches = {
 709                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 710                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ZBook 17"),
 711                 },
 712         },
 713         {
 714         .callback = video_set_use_native_backlight,
 715         .ident = "HP EliteBook 8470p",
 716         .matches = {
 717                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 718                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8470p"),
 719                 },
 720         },
 721         {
 722         .callback = video_set_use_native_backlight,
 723         .ident = "HP EliteBook 8780w",
 724         .matches = {
 725                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 726                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
 727                 },
 728         },
 729
 730         /*
 731          * These models have a working acpi_video backlight control, and using
 732          * native backlight causes a regression where backlight does not work
 733          * when userspace is not handling brightness key events. Disable
 734          * native_backlight on these to fix this:
 735          * https://bugzilla.kernel.org/show_bug.cgi?id=81691
 736          */
 737         {
 738          .callback = video_disable_native_backlight,
 739          .ident = "ThinkPad T420",
 740          .matches = {
 741                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 742                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
 743                 },
 744         },
 745         {
 746          .callback = video_disable_native_backlight,
 747          .ident = "ThinkPad T520",
 748          .matches = {
 749                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 750                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
 751                 },
 752         },
 753
 754         /* The native backlight controls do not work on some older machines */
 755         {
 756          /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
 757          .callback = video_disable_native_backlight,
 758          .ident = "HP ENVY 15 Notebook",
 759          .matches = {
 760                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 761                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
 762                 },
 763         },
 764         {}
 765 };
 766
 767 static unsigned long long
 768 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
 769                               unsigned long long bqc_value)
 770 {
 771         unsigned long long level;
 772
 773         if (device->brightness->flags._BQC_use_index) {
 774                 /*
 775                  * _BQC returns an index that doesn't account for
 776                  * the first 2 items with special meaning, so we need
 777                  * to compensate for that by offsetting ourselves
 778                  */
 779                 if (device->brightness->flags._BCL_reversed)
 780                         bqc_value = device->brightness->count - 3 - bqc_value;
 781
 782                 level = device->brightness->levels[bqc_value + 2];
 783         } else {
 784                 level = bqc_value;
 785         }
 786
 787         level += bqc_offset_aml_bug_workaround;
 788
 789         return level;
 790 }
 791
 792 static int
 793 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 794                                         unsigned long long *level, bool raw)
 795 {
 796         acpi_status status = AE_OK;
 797         int i;
 798
 799         if (device->cap._BQC || device->cap._BCQ) {
 800                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 801
 802                 status = acpi_evaluate_integer(device->dev->handle, buf,
 803                                                 NULL, level);
 804                 if (ACPI_SUCCESS(status)) {
 805                         if (raw) {
 806                                 /*
 807                                  * Caller has indicated he wants the raw
 808                                  * value returned by _BQC, so don't furtherly
 809                                  * mess with the value.
 810                                  */
 811                                 return 0;
 812                         }
 813
 814                         *level = acpi_video_bqc_value_to_level(device, *level);
 815
 816                         for (i = 2; i < device->brightness->count; i++)
 817                                 if (device->brightness->levels[i] == *level) {
 818                                         device->brightness->curr = *level;
 819                                         return 0;
 820                                 }
 821                         /*
 822                          * BQC returned an invalid level.
 823                          * Stop using it.
 824                          */
 825                         ACPI_WARNING((AE_INFO,
 826                                       "%s returned an invalid level",
 827                                       buf));
 828                         device->cap._BQC = device->cap._BCQ = 0;
 829                 } else {
 830                         /*
 831                          * Fixme:
 832                          * should we return an error or ignore this failure?
 833                          * dev->brightness->curr is a cached value which stores
 834                          * the correct current backlight level in most cases.
 835                          * ACPI video backlight still works w/ buggy _BQC.
 836                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 837                          */
 838                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 839                         device->cap._BQC = device->cap._BCQ = 0;
 840                 }
 841         }
 842
 843         *level = device->brightness->curr;
 844         return 0;
 845 }
 846
 847 static int
 848 acpi_video_device_EDID(struct acpi_video_device *device,
 849                        union acpi_object **edid, ssize_t length)
 850 {
 851         int status;
 852         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 853         union acpi_object *obj;
 854         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 855         struct acpi_object_list args = { 1, &arg0 };
 856
 857
 858         *edid = NULL;
 859
 860         if (!device)
 861                 return -ENODEV;
 862         if (length == 128)
 863                 arg0.integer.value = 1;
 864         else if (length == 256)
 865                 arg0.integer.value = 2;
 866         else
 867                 return -EINVAL;
 868
 869         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 870         if (ACPI_FAILURE(status))
 871                 return -ENODEV;
 872
 873         obj = buffer.pointer;
 874
 875         if (obj && obj->type == ACPI_TYPE_BUFFER)
 876                 *edid = obj;
 877         else {
 878                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 879                 status = -EFAULT;
 880                 kfree(obj);
 881         }
 882
 883         return status;
 884 }
 885
 886 /* bus */
 887
 888 /*
 889  *  Arg:
 890  *      video           : video bus device pointer
 891  *      bios_flag       :
 892  *              0.      The system BIOS should NOT automatically switch(toggle)
 893  *                      the active display output.
 894  *              1.      The system BIOS should automatically switch (toggle) the
 895  *                      active display output. No switch event.
 896  *              2.      The _DGS value should be locked.
 897  *              3.      The system BIOS should not automatically switch (toggle) the
 898  *                      active display output, but instead generate the display switch
 899  *                      event notify code.
 900  *      lcd_flag        :
 901  *              0.      The system BIOS should automatically control the brightness level
 902  *                      of the LCD when the power changes from AC to DC
 903  *              1.      The system BIOS should NOT automatically control the brightness
 904  *                      level of the LCD when the power changes from AC to DC.
 905  *  Return Value:
 906  *              -EINVAL wrong arg.
 907  */
 908
 909 static int
 910 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 911 {
 912         acpi_status status;
 913
 914         if (!video->cap._DOS)
 915                 return 0;
 916
 917         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
 918                 return -EINVAL;
 919         video->dos_setting = (lcd_flag << 2) | bios_flag;
 920         status = acpi_execute_simple_method(video->device->handle, "_DOS",
 921                                             (lcd_flag << 2) | bios_flag);
 922         if (ACPI_FAILURE(status))
 923                 return -EIO;
 924
 925         return 0;
 926 }
 927
 928 /*
 929  * Simple comparison function used to sort backlight levels.
 930  */
 931
 932 static int
 933 acpi_video_cmp_level(const void *a, const void *b)
 934 {
 935         return *(int *)a - *(int *)b;
 936 }
 937
 938 /*
 939  * Decides if _BQC/_BCQ for this system is usable
 940  *
 941  * We do this by changing the level first and then read out the current
 942  * brightness level, if the value does not match, find out if it is using
 943  * index. If not, clear the _BQC/_BCQ capability.
 944  */
 945 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
 946                                 int max_level, int current_level)
 947 {
 948         struct acpi_video_device_brightness *br = device->brightness;
 949         int result;
 950         unsigned long long level;
 951         int test_level;
 952
 953         /* don't mess with existing known broken systems */
 954         if (bqc_offset_aml_bug_workaround)
 955                 return 0;
 956
 957         /*
 958          * Some systems always report current brightness level as maximum
 959          * through _BQC, we need to test another value for them.
 960          */
 961         test_level = current_level == max_level ? br->levels[3] : max_level;
 962
 963         result = acpi_video_device_lcd_set_level(device, test_level);
 964         if (result)
 965                 return result;
 966
 967         result = acpi_video_device_lcd_get_level_current(device, &level, true);
 968         if (result)
 969                 return result;
 970
 971         if (level != test_level) {
 972                 /* buggy _BQC found, need to find out if it uses index */
 973                 if (level < br->count) {
 974                         if (br->flags._BCL_reversed)
 975                                 level = br->count - 3 - level;
 976                         if (br->levels[level + 2] == test_level)
 977                                 br->flags._BQC_use_index = 1;
 978                 }
 979
 980                 if (!br->flags._BQC_use_index)
 981                         device->cap._BQC = device->cap._BCQ = 0;
 982         }
 983
 984         return 0;
 985 }
 986
 987
 988 /*
 989  *  Arg:
 990  *      device  : video output device (LCD, CRT, ..)
 991  *
 992  *  Return Value:
 993  *      Maximum brightness level
 994  *
 995  *  Allocate and initialize device->brightness.
 996  */
 997
 998 static int
 999 acpi_video_init_brightness(struct acpi_video_device *device)
1000 {
1001         union acpi_object *obj = NULL;
1002         int i, max_level = 0, count = 0, level_ac_battery = 0;
1003         unsigned long long level, level_old;
1004         union acpi_object *o;
1005         struct acpi_video_device_brightness *br = NULL;
1006         int result = -EINVAL;
1007         u32 value;
1008
1009         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
1010                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
1011                                                 "LCD brightness level\n"));
1012                 goto out;
1013         }
1014
1015         if (obj->package.count < 2)
1016                 goto out;
1017
1018         br = kzalloc(sizeof(*br), GFP_KERNEL);
1019         if (!br) {
1020                 printk(KERN_ERR "can't allocate memory\n");
1021                 result = -ENOMEM;
1022                 goto out;
1023         }
1024
1025         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
1026                                 GFP_KERNEL);
1027         if (!br->levels) {
1028                 result = -ENOMEM;
1029                 goto out_free;
1030         }
1031
1032         for (i = 0; i < obj->package.count; i++) {
1033                 o = (union acpi_object *)&obj->package.elements[i];
1034                 if (o->type != ACPI_TYPE_INTEGER) {
1035                         printk(KERN_ERR PREFIX "Invalid data\n");
1036                         continue;
1037                 }
1038                 value = (u32) o->integer.value;
1039                 /* Skip duplicate entries */
1040                 if (count > 2 && br->levels[count - 1] == value)
1041                         continue;
1042
1043                 br->levels[count] = value;
1044
1045                 if (br->levels[count] > max_level)
1046                         max_level = br->levels[count];
1047                 count++;
1048         }
1049
1050         /*
1051          * some buggy BIOS don't export the levels
1052          * when machine is on AC/Battery in _BCL package.
1053          * In this case, the first two elements in _BCL packages
1054          * are also supported brightness levels that OS should take care of.
1055          */
1056         for (i = 2; i < count; i++) {
1057                 if (br->levels[i] == br->levels[0])
1058                         level_ac_battery++;
1059                 if (br->levels[i] == br->levels[1])
1060                         level_ac_battery++;
1061         }
1062
1063         if (level_ac_battery < 2) {
1064                 level_ac_battery = 2 - level_ac_battery;
1065                 br->flags._BCL_no_ac_battery_levels = 1;
1066                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
1067                         br->levels[i] = br->levels[i - level_ac_battery];
1068                 count += level_ac_battery;
1069         } else if (level_ac_battery > 2)
1070                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
1071
1072         /* Check if the _BCL package is in a reversed order */
1073         if (max_level == br->levels[2]) {
1074                 br->flags._BCL_reversed = 1;
1075                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
1076                         acpi_video_cmp_level, NULL);
1077         } else if (max_level != br->levels[count - 1])
1078                 ACPI_ERROR((AE_INFO,
1079                             "Found unordered _BCL package"));
1080
1081         br->count = count;
1082         device->brightness = br;
1083
1084         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
1085         br->curr = level = max_level;
1086
1087         if (!device->cap._BQC)
1088                 goto set_level;
1089
1090         result = acpi_video_device_lcd_get_level_current(device,
1091                                                          &level_old, true);
1092         if (result)
1093                 goto out_free_levels;
1094
1095         result = acpi_video_bqc_quirk(device, max_level, level_old);
1096         if (result)
1097                 goto out_free_levels;
1098         /*
1099          * cap._BQC may get cleared due to _BQC is found to be broken
1100          * in acpi_video_bqc_quirk, so check again here.
1101          */
1102         if (!device->cap._BQC)
1103                 goto set_level;
1104
1105         level = acpi_video_bqc_value_to_level(device, level_old);
1106         /*
1107          * On some buggy laptops, _BQC returns an uninitialized
1108          * value when invoked for the first time, i.e.
1109          * level_old is invalid (no matter whether it's a level
1110          * or an index). Set the backlight to max_level in this case.
1111          */
1112         for (i = 2; i < br->count; i++)
1113                 if (level == br->levels[i])
1114                         break;
1115         if (i == br->count || !level)
1116                 level = max_level;
1117
1118 set_level:
1119         result = acpi_video_device_lcd_set_level(device, level);
1120         if (result)
1121                 goto out_free_levels;
1122
1123         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1124                           "found %d brightness levels\n", count - 2));
1125         kfree(obj);
1126         return result;
1127
1128 out_free_levels:
1129         kfree(br->levels);
1130 out_free:
1131         kfree(br);
1132 out:
1133         device->brightness = NULL;
1134         kfree(obj);
1135         return result;
1136 }
1137
1138 /*
1139  *  Arg:
1140  *      device  : video output device (LCD, CRT, ..)
1141  *
1142  *  Return Value:
1143  *      None
1144  *
1145  *  Find out all required AML methods defined under the output
1146  *  device.
1147  */
1148
1149 static void acpi_video_device_find_cap(struct acpi_video_device *device)
1150 {
1151         if (acpi_has_method(device->dev->handle, "_ADR"))
1152                 device->cap._ADR = 1;
1153         if (acpi_has_method(device->dev->handle, "_BCL"))
1154                 device->cap._BCL = 1;
1155         if (acpi_has_method(device->dev->handle, "_BCM"))
1156                 device->cap._BCM = 1;
1157         if (acpi_has_method(device->dev->handle, "_BQC")) {
1158                 device->cap._BQC = 1;
1159         } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
1160                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
1161                 device->cap._BCQ = 1;
1162         }
1163
1164         if (acpi_has_method(device->dev->handle, "_DDC"))
1165                 device->cap._DDC = 1;
1166 }
1167
1168 /*
1169  *  Arg:
1170  *      device  : video output device (VGA)
1171  *
1172  *  Return Value:
1173  *      None
1174  *
1175  *  Find out all required AML methods defined under the video bus device.
1176  */
1177
1178 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
1179 {
1180         if (acpi_has_method(video->device->handle, "_DOS"))
1181                 video->cap._DOS = 1;
1182         if (acpi_has_method(video->device->handle, "_DOD"))
1183                 video->cap._DOD = 1;
1184         if (acpi_has_method(video->device->handle, "_ROM"))
1185                 video->cap._ROM = 1;
1186         if (acpi_has_method(video->device->handle, "_GPD"))
1187                 video->cap._GPD = 1;
1188         if (acpi_has_method(video->device->handle, "_SPD"))
1189                 video->cap._SPD = 1;
1190         if (acpi_has_method(video->device->handle, "_VPO"))
1191                 video->cap._VPO = 1;
1192 }
1193
1194 /*
1195  * Check whether the video bus device has required AML method to
1196  * support the desired features
1197  */
1198
1199 static int acpi_video_bus_check(struct acpi_video_bus *video)
1200 {
1201         acpi_status status = -ENOENT;
1202         struct pci_dev *dev;
1203
1204         if (!video)
1205                 return -EINVAL;
1206
1207         dev = acpi_get_pci_dev(video->device->handle);
1208         if (!dev)
1209                 return -ENODEV;
1210         pci_dev_put(dev);
1211
1212         /*
1213          * Since there is no HID, CID and so on for VGA driver, we have
1214          * to check well known required nodes.
1215          */
1216
1217         /* Does this device support video switching? */
1218         if (video->cap._DOS || video->cap._DOD) {
1219                 if (!video->cap._DOS) {
1220                         printk(KERN_WARNING FW_BUG
1221                                 "ACPI(%s) defines _DOD but not _DOS\n",
1222                                 acpi_device_bid(video->device));
1223                 }
1224                 video->flags.multihead = 1;
1225                 status = 0;
1226         }
1227
1228         /* Does this device support retrieving a video ROM? */
1229         if (video->cap._ROM) {
1230                 video->flags.rom = 1;
1231                 status = 0;
1232         }
1233
1234         /* Does this device support configuring which video device to POST? */
1235         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1236                 video->flags.post = 1;
1237                 status = 0;
1238         }
1239
1240         return status;
1241 }
1242
1243 /*
1244  * --------------------------------------------------------------------------
1245  *                               Driver Interface
1246  * --------------------------------------------------------------------------
1247  */
1248
1249 /* device interface */
1250 static struct acpi_video_device_attrib *
1251 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1252 {
1253         struct acpi_video_enumerated_device *ids;
1254         int i;
1255
1256         for (i = 0; i < video->attached_count; i++) {
1257                 ids = &video->attached_array[i];
1258                 if ((ids->value.int_val & 0xffff) == device_id)
1259                         return &ids->value.attrib;
1260         }
1261
1262         return NULL;
1263 }
1264
1265 static int
1266 acpi_video_get_device_type(struct acpi_video_bus *video,
1267                            unsigned long device_id)
1268 {
1269         struct acpi_video_enumerated_device *ids;
1270         int i;
1271
1272         for (i = 0; i < video->attached_count; i++) {
1273                 ids = &video->attached_array[i];
1274                 if ((ids->value.int_val & 0xffff) == device_id)
1275                         return ids->value.int_val;
1276         }
1277
1278         return 0;
1279 }
1280
1281 static int
1282 acpi_video_bus_get_one_device(struct acpi_device *device,
1283                               struct acpi_video_bus *video)
1284 {
1285         unsigned long long device_id;
1286         int status, device_type;
1287         struct acpi_video_device *data;
1288         struct acpi_video_device_attrib *attribute;
1289
1290         status =
1291             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1292         /* Some device omits _ADR, we skip them instead of fail */
1293         if (ACPI_FAILURE(status))
1294                 return 0;
1295
1296         data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1297         if (!data)
1298                 return -ENOMEM;
1299
1300         strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1301         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1302         device->driver_data = data;
1303
1304         data->device_id = device_id;
1305         data->video = video;
1306         data->dev = device;
1307         INIT_DELAYED_WORK(&data->switch_brightness_work,
1308                           acpi_video_switch_brightness);
1309
1310         attribute = acpi_video_get_device_attr(video, device_id);
1311
1312         if (attribute && attribute->device_id_scheme) {
1313                 switch (attribute->display_type) {
1314                 case ACPI_VIDEO_DISPLAY_CRT:
1315                         data->flags.crt = 1;
1316                         break;
1317                 case ACPI_VIDEO_DISPLAY_TV:
1318                         data->flags.tvout = 1;
1319                         break;
1320                 case ACPI_VIDEO_DISPLAY_DVI:
1321                         data->flags.dvi = 1;
1322                         break;
1323                 case ACPI_VIDEO_DISPLAY_LCD:
1324                         data->flags.lcd = 1;
1325                         break;
1326                 default:
1327                         data->flags.unknown = 1;
1328                         break;
1329                 }
1330                 if (attribute->bios_can_detect)
1331                         data->flags.bios = 1;
1332         } else {
1333                 /* Check for legacy IDs */
1334                 device_type = acpi_video_get_device_type(video, device_id);
1335                 /* Ignore bits 16 and 18-20 */
1336                 switch (device_type & 0xffe2ffff) {
1337                 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1338                         data->flags.crt = 1;
1339                         break;
1340                 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1341                         data->flags.lcd = 1;
1342                         break;
1343                 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1344                         data->flags.tvout = 1;
1345                         break;
1346                 default:
1347                         data->flags.unknown = 1;
1348                 }
1349         }
1350
1351         acpi_video_device_bind(video, data);
1352         acpi_video_device_find_cap(data);
1353
1354         mutex_lock(&video->device_list_lock);
1355         list_add_tail(&data->entry, &video->video_device_list);
1356         mutex_unlock(&video->device_list_lock);
1357
1358         return status;
1359 }
1360
1361 /*
1362  *  Arg:
1363  *      video   : video bus device
1364  *
1365  *  Return:
1366  *      none
1367  *
1368  *  Enumerate the video device list of the video bus,
1369  *  bind the ids with the corresponding video devices
1370  *  under the video bus.
1371  */
1372
1373 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1374 {
1375         struct acpi_video_device *dev;
1376
1377         mutex_lock(&video->device_list_lock);
1378
1379         list_for_each_entry(dev, &video->video_device_list, entry)
1380                 acpi_video_device_bind(video, dev);
1381
1382         mutex_unlock(&video->device_list_lock);
1383 }
1384
1385 /*
1386  *  Arg:
1387  *      video   : video bus device
1388  *      device  : video output device under the video
1389  *              bus
1390  *
1391  *  Return:
1392  *      none
1393  *
1394  *  Bind the ids with the corresponding video devices
1395  *  under the video bus.
1396  */
1397
1398 static void
1399 acpi_video_device_bind(struct acpi_video_bus *video,
1400                        struct acpi_video_device *device)
1401 {
1402         struct acpi_video_enumerated_device *ids;
1403         int i;
1404
1405         for (i = 0; i < video->attached_count; i++) {
1406                 ids = &video->attached_array[i];
1407                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1408                         ids->bind_info = device;
1409                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1410                 }
1411         }
1412 }
1413
1414 /*
1415  *  Arg:
1416  *      video   : video bus device
1417  *
1418  *  Return:
1419  *      < 0     : error
1420  *
1421  *  Call _DOD to enumerate all devices attached to display adapter
1422  *
1423  */
1424
1425 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1426 {
1427         int status;
1428         int count;
1429         int i;
1430         struct acpi_video_enumerated_device *active_list;
1431         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1432         union acpi_object *dod = NULL;
1433         union acpi_object *obj;
1434
1435         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1436         if (!ACPI_SUCCESS(status)) {
1437                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1438                 return status;
1439         }
1440
1441         dod = buffer.pointer;
1442         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1443                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1444                 status = -EFAULT;
1445                 goto out;
1446         }
1447
1448         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1449                           dod->package.count));
1450
1451         active_list = kcalloc(1 + dod->package.count,
1452                               sizeof(struct acpi_video_enumerated_device),
1453                               GFP_KERNEL);
1454         if (!active_list) {
1455                 status = -ENOMEM;
1456                 goto out;
1457         }
1458
1459         count = 0;
1460         for (i = 0; i < dod->package.count; i++) {
1461                 obj = &dod->package.elements[i];
1462
1463                 if (obj->type != ACPI_TYPE_INTEGER) {
1464                         printk(KERN_ERR PREFIX
1465                                 "Invalid _DOD data in element %d\n", i);
1466                         continue;
1467                 }
1468
1469                 active_list[count].value.int_val = obj->integer.value;
1470                 active_list[count].bind_info = NULL;
1471                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1472                                   (int)obj->integer.value));
1473                 count++;
1474         }
1475
1476         kfree(video->attached_array);
1477
1478         video->attached_array = active_list;
1479         video->attached_count = count;
1480
1481 out:
1482         kfree(buffer.pointer);
1483         return status;
1484 }
1485
1486 static int
1487 acpi_video_get_next_level(struct acpi_video_device *device,
1488                           u32 level_current, u32 event)
1489 {
1490         int min, max, min_above, max_below, i, l, delta = 255;
1491         max = max_below = 0;
1492         min = min_above = 255;
1493         /* Find closest level to level_current */
1494         for (i = 2; i < device->brightness->count; i++) {
1495                 l = device->brightness->levels[i];
1496                 if (abs(l - level_current) < abs(delta)) {
1497                         delta = l - level_current;
1498                         if (!delta)
1499                                 break;
1500                 }
1501         }
1502         /* Ajust level_current to closest available level */
1503         level_current += delta;
1504         for (i = 2; i < device->brightness->count; i++) {
1505                 l = device->brightness->levels[i];
1506                 if (l < min)
1507                         min = l;
1508                 if (l > max)
1509                         max = l;
1510                 if (l < min_above && l > level_current)
1511                         min_above = l;
1512                 if (l > max_below && l < level_current)
1513                         max_below = l;
1514         }
1515
1516         switch (event) {
1517         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1518                 return (level_current < max) ? min_above : min;
1519         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1520                 return (level_current < max) ? min_above : max;
1521         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1522                 return (level_current > min) ? max_below : min;
1523         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1524         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1525                 return 0;
1526         default:
1527                 return level_current;
1528         }
1529 }
1530
1531 static void
1532 acpi_video_switch_brightness(struct work_struct *work)
1533 {
1534         struct acpi_video_device *device = container_of(to_delayed_work(work),
1535                              struct acpi_video_device, switch_brightness_work);
1536         unsigned long long level_current, level_next;
1537         int event = device->switch_brightness_event;
1538         int result = -EINVAL;
1539
1540         /* no warning message if acpi_backlight=vendor or a quirk is used */
1541         if (!acpi_video_verify_backlight_support())
1542                 return;
1543
1544         if (!device->brightness)
1545                 goto out;
1546
1547         result = acpi_video_device_lcd_get_level_current(device,
1548                                                          &level_current,
1549                                                          false);
1550         if (result)
1551                 goto out;
1552
1553         level_next = acpi_video_get_next_level(device, level_current, event);
1554
1555         result = acpi_video_device_lcd_set_level(device, level_next);
1556
1557         if (!result)
1558                 backlight_force_update(device->backlight,
1559                                        BACKLIGHT_UPDATE_HOTKEY);
1560
1561 out:
1562         if (result)
1563                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1564 }
1565
1566 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1567                         void **edid)
1568 {
1569         struct acpi_video_bus *video;
1570         struct acpi_video_device *video_device;
1571         union acpi_object *buffer = NULL;
1572         acpi_status status;
1573         int i, length;
1574
1575         if (!device || !acpi_driver_data(device))
1576                 return -EINVAL;
1577
1578         video = acpi_driver_data(device);
1579
1580         for (i = 0; i < video->attached_count; i++) {
1581                 video_device = video->attached_array[i].bind_info;
1582                 length = 256;
1583
1584                 if (!video_device)
1585                         continue;
1586
1587                 if (!video_device->cap._DDC)
1588                         continue;
1589
1590                 if (type) {
1591                         switch (type) {
1592                         case ACPI_VIDEO_DISPLAY_CRT:
1593                                 if (!video_device->flags.crt)
1594                                         continue;
1595                                 break;
1596                         case ACPI_VIDEO_DISPLAY_TV:
1597                                 if (!video_device->flags.tvout)
1598                                         continue;
1599                                 break;
1600                         case ACPI_VIDEO_DISPLAY_DVI:
1601                                 if (!video_device->flags.dvi)
1602                                         continue;
1603                                 break;
1604                         case ACPI_VIDEO_DISPLAY_LCD:
1605                                 if (!video_device->flags.lcd)
1606                                         continue;
1607                                 break;
1608                         }
1609                 } else if (video_device->device_id != device_id) {
1610                         continue;
1611                 }
1612
1613                 status = acpi_video_device_EDID(video_device, &buffer, length);
1614
1615                 if (ACPI_FAILURE(status) || !buffer ||
1616                     buffer->type != ACPI_TYPE_BUFFER) {
1617                         length = 128;
1618                         status = acpi_video_device_EDID(video_device, &buffer,
1619                                                         length);
1620                         if (ACPI_FAILURE(status) || !buffer ||
1621                             buffer->type != ACPI_TYPE_BUFFER) {
1622                                 continue;
1623                         }
1624                 }
1625
1626                 *edid = buffer->buffer.pointer;
1627                 return length;
1628         }
1629
1630         return -ENODEV;
1631 }
1632 EXPORT_SYMBOL(acpi_video_get_edid);
1633
1634 static int
1635 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1636                            struct acpi_device *device)
1637 {
1638         int status = 0;
1639         struct acpi_device *dev;
1640
1641         /*
1642          * There are systems where video module known to work fine regardless
1643          * of broken _DOD and ignoring returned value here doesn't cause
1644          * any issues later.
1645          */
1646         acpi_video_device_enumerate(video);
1647
1648         list_for_each_entry(dev, &device->children, node) {
1649
1650                 status = acpi_video_bus_get_one_device(dev, video);
1651                 if (status) {
1652                         dev_err(&dev->dev, "Can't attach device\n");
1653                         break;
1654                 }
1655         }
1656         return status;
1657 }
1658
1659 /* acpi_video interface */
1660
1661 /*
1662  * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1663  * preform any automatic brightness change on receiving a notification.
1664  */
1665 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1666 {
1667         return acpi_video_bus_DOS(video, 0,
1668                                   acpi_osi_is_win8() ? 1 : 0);
1669 }
1670
1671 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1672 {
1673         return acpi_video_bus_DOS(video, 0,
1674                                   acpi_osi_is_win8() ? 0 : 1);
1675 }
1676
1677 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1678 {
1679         struct acpi_video_bus *video = acpi_driver_data(device);
1680         struct input_dev *input;
1681         int keycode = 0;
1682
1683         if (!video || !video->input)
1684                 return;
1685
1686         input = video->input;
1687
1688         switch (event) {
1689         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1690                                          * most likely via hotkey. */
1691                 keycode = KEY_SWITCHVIDEOMODE;
1692                 break;
1693
1694         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1695                                          * connector. */
1696                 acpi_video_device_enumerate(video);
1697                 acpi_video_device_rebind(video);
1698                 keycode = KEY_SWITCHVIDEOMODE;
1699                 break;
1700
1701         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1702                 keycode = KEY_SWITCHVIDEOMODE;
1703                 break;
1704         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1705                 keycode = KEY_VIDEO_NEXT;
1706                 break;
1707         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1708                 keycode = KEY_VIDEO_PREV;
1709                 break;
1710
1711         default:
1712                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1713                                   "Unsupported event [0x%x]\n", event));
1714                 break;
1715         }
1716
1717         if (acpi_notifier_call_chain(device, event, 0))
1718                 /* Something vetoed the keypress. */
1719                 keycode = 0;
1720
1721         if (keycode) {
1722                 input_report_key(input, keycode, 1);
1723                 input_sync(input);
1724                 input_report_key(input, keycode, 0);
1725                 input_sync(input);
1726         }
1727
1728         return;
1729 }
1730
1731 static void brightness_switch_event(struct acpi_video_device *video_device,
1732                                     u32 event)
1733 {
1734         if (!brightness_switch_enabled)
1735                 return;
1736
1737         video_device->switch_brightness_event = event;
1738         schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1739 }
1740
1741 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1742 {
1743         struct acpi_video_device *video_device = data;
1744         struct acpi_device *device = NULL;
1745         struct acpi_video_bus *bus;
1746         struct input_dev *input;
1747         int keycode = 0;
1748
1749         if (!video_device)
1750                 return;
1751
1752         device = video_device->dev;
1753         bus = video_device->video;
1754         input = bus->input;
1755
1756         switch (event) {
1757         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1758                 brightness_switch_event(video_device, event);
1759                 keycode = KEY_BRIGHTNESS_CYCLE;
1760                 break;
1761         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1762                 brightness_switch_event(video_device, event);
1763                 keycode = KEY_BRIGHTNESSUP;
1764                 break;
1765         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1766                 brightness_switch_event(video_device, event);
1767                 keycode = KEY_BRIGHTNESSDOWN;
1768                 break;
1769         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1770                 brightness_switch_event(video_device, event);
1771                 keycode = KEY_BRIGHTNESS_ZERO;
1772                 break;
1773         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1774                 brightness_switch_event(video_device, event);
1775                 keycode = KEY_DISPLAY_OFF;
1776                 break;
1777         default:
1778                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1779                                   "Unsupported event [0x%x]\n", event));
1780                 break;
1781         }
1782
1783         acpi_notifier_call_chain(device, event, 0);
1784
1785         if (keycode) {
1786                 input_report_key(input, keycode, 1);
1787                 input_sync(input);
1788                 input_report_key(input, keycode, 0);
1789                 input_sync(input);
1790         }
1791
1792         return;
1793 }
1794
1795 static int acpi_video_resume(struct notifier_block *nb,
1796                                 unsigned long val, void *ign)
1797 {
1798         struct acpi_video_bus *video;
1799         struct acpi_video_device *video_device;
1800         int i;
1801
1802         switch (val) {
1803         case PM_HIBERNATION_PREPARE:
1804         case PM_SUSPEND_PREPARE:
1805         case PM_RESTORE_PREPARE:
1806                 return NOTIFY_DONE;
1807         }
1808
1809         video = container_of(nb, struct acpi_video_bus, pm_nb);
1810
1811         dev_info(&video->device->dev, "Restoring backlight state\n");
1812
1813         for (i = 0; i < video->attached_count; i++) {
1814                 video_device = video->attached_array[i].bind_info;
1815                 if (video_device && video_device->backlight)
1816                         acpi_video_set_brightness(video_device->backlight);
1817         }
1818
1819         return NOTIFY_OK;
1820 }
1821
1822 static acpi_status
1823 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1824                         void **return_value)
1825 {
1826         struct acpi_device *device = context;
1827         struct acpi_device *sibling;
1828         int result;
1829
1830         if (handle == device->handle)
1831                 return AE_CTRL_TERMINATE;
1832
1833         result = acpi_bus_get_device(handle, &sibling);
1834         if (result)
1835                 return AE_OK;
1836
1837         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1838                         return AE_ALREADY_EXISTS;
1839
1840         return AE_OK;
1841 }
1842
1843 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1844 {
1845         struct backlight_properties props;
1846         struct pci_dev *pdev;
1847         acpi_handle acpi_parent;
1848         struct device *parent = NULL;
1849         int result;
1850         static int count;
1851         char *name;
1852
1853         result = acpi_video_init_brightness(device);
1854         if (result)
1855                 return;
1856         name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1857         if (!name)
1858                 return;
1859         count++;
1860
1861         acpi_get_parent(device->dev->handle, &acpi_parent);
1862
1863         pdev = acpi_get_pci_dev(acpi_parent);
1864         if (pdev) {
1865                 parent = &pdev->dev;
1866                 pci_dev_put(pdev);
1867         }
1868
1869         memset(&props, 0, sizeof(struct backlight_properties));
1870         props.type = BACKLIGHT_FIRMWARE;
1871         props.max_brightness = device->brightness->count - 3;
1872         device->backlight = backlight_device_register(name,
1873                                                       parent,
1874                                                       device,
1875                                                       &acpi_backlight_ops,
1876                                                       &props);
1877         kfree(name);
1878         if (IS_ERR(device->backlight))
1879                 return;
1880
1881         /*
1882          * Save current brightness level in case we have to restore it
1883          * before acpi_video_device_lcd_set_level() is called next time.
1884          */
1885         device->backlight->props.brightness =
1886                         acpi_video_get_brightness(device->backlight);
1887
1888         device->cooling_dev = thermal_cooling_device_register("LCD",
1889                                 device->dev, &video_cooling_ops);
1890         if (IS_ERR(device->cooling_dev)) {
1891                 /*
1892                  * Set cooling_dev to NULL so we don't crash trying to free it.
1893                  * Also, why the hell we are returning early and not attempt to
1894                  * register video output if cooling device registration failed?
1895                  * -- dtor
1896                  */
1897                 device->cooling_dev = NULL;
1898                 return;
1899         }
1900
1901         dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1902                  device->cooling_dev->id);
1903         result = sysfs_create_link(&device->dev->dev.kobj,
1904                         &device->cooling_dev->device.kobj,
1905                         "thermal_cooling");
1906         if (result)
1907                 printk(KERN_ERR PREFIX "Create sysfs link\n");
1908         result = sysfs_create_link(&device->cooling_dev->device.kobj,
1909                         &device->dev->dev.kobj, "device");
1910         if (result)
1911                 printk(KERN_ERR PREFIX "Create sysfs link\n");
1912 }
1913
1914 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1915 {
1916         struct acpi_video_device *dev;
1917
1918         if (video->backlight_registered)
1919                 return 0;
1920
1921         if (!acpi_video_verify_backlight_support())
1922                 return 0;
1923
1924         mutex_lock(&video->device_list_lock);
1925         list_for_each_entry(dev, &video->video_device_list, entry)
1926                 acpi_video_dev_register_backlight(dev);
1927         mutex_unlock(&video->device_list_lock);
1928
1929         video->backlight_registered = true;
1930
1931         video->pm_nb.notifier_call = acpi_video_resume;
1932         video->pm_nb.priority = 0;
1933         return register_pm_notifier(&video->pm_nb);
1934 }
1935
1936 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1937 {
1938         if (device->backlight) {
1939                 backlight_device_unregister(device->backlight);
1940                 device->backlight = NULL;
1941         }
1942         if (device->brightness) {
1943                 kfree(device->brightness->levels);
1944                 kfree(device->brightness);
1945                 device->brightness = NULL;
1946         }
1947         if (device->cooling_dev) {
1948                 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1949                 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1950                 thermal_cooling_device_unregister(device->cooling_dev);
1951                 device->cooling_dev = NULL;
1952         }
1953 }
1954
1955 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1956 {
1957         struct acpi_video_device *dev;
1958         int error;
1959
1960         if (!video->backlight_registered)
1961                 return 0;
1962
1963         error = unregister_pm_notifier(&video->pm_nb);
1964
1965         mutex_lock(&video->device_list_lock);
1966         list_for_each_entry(dev, &video->video_device_list, entry)
1967                 acpi_video_dev_unregister_backlight(dev);
1968         mutex_unlock(&video->device_list_lock);
1969
1970         video->backlight_registered = false;
1971
1972         return error;
1973 }
1974
1975 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1976 {
1977         acpi_status status;
1978         struct acpi_device *adev = device->dev;
1979
1980         status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1981                                              acpi_video_device_notify, device);
1982         if (ACPI_FAILURE(status))
1983                 dev_err(&adev->dev, "Error installing notify handler\n");
1984         else
1985                 device->flags.notify = 1;
1986 }
1987
1988 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1989 {
1990         struct input_dev *input;
1991         struct acpi_video_device *dev;
1992         int error;
1993
1994         video->input = input = input_allocate_device();
1995         if (!input) {
1996                 error = -ENOMEM;
1997                 goto out;
1998         }
1999
2000         error = acpi_video_bus_start_devices(video);
2001         if (error)
2002                 goto err_free_input;
2003
2004         snprintf(video->phys, sizeof(video->phys),
2005                         "%s/video/input0", acpi_device_hid(video->device));
2006
2007         input->name = acpi_device_name(video->device);
2008         input->phys = video->phys;
2009         input->id.bustype = BUS_HOST;
2010         input->id.product = 0x06;
2011         input->dev.parent = &video->device->dev;
2012         input->evbit[0] = BIT(EV_KEY);
2013         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
2014         set_bit(KEY_VIDEO_NEXT, input->keybit);
2015         set_bit(KEY_VIDEO_PREV, input->keybit);
2016         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
2017         set_bit(KEY_BRIGHTNESSUP, input->keybit);
2018         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
2019         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
2020         set_bit(KEY_DISPLAY_OFF, input->keybit);
2021
2022         error = input_register_device(input);
2023         if (error)
2024                 goto err_stop_dev;
2025
2026         mutex_lock(&video->device_list_lock);
2027         list_for_each_entry(dev, &video->video_device_list, entry)
2028                 acpi_video_dev_add_notify_handler(dev);
2029         mutex_unlock(&video->device_list_lock);
2030
2031         return 0;
2032
2033 err_stop_dev:
2034         acpi_video_bus_stop_devices(video);
2035 err_free_input:
2036         input_free_device(input);
2037         video->input = NULL;
2038 out:
2039         return error;
2040 }
2041
2042 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
2043 {
2044         if (dev->flags.notify) {
2045                 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
2046                                            acpi_video_device_notify);
2047                 dev->flags.notify = 0;
2048         }
2049 }
2050
2051 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
2052 {
2053         struct acpi_video_device *dev;
2054
2055         mutex_lock(&video->device_list_lock);
2056         list_for_each_entry(dev, &video->video_device_list, entry)
2057                 acpi_video_dev_remove_notify_handler(dev);
2058         mutex_unlock(&video->device_list_lock);
2059
2060         acpi_video_bus_stop_devices(video);
2061         input_unregister_device(video->input);
2062         video->input = NULL;
2063 }
2064
2065 static int acpi_video_backlight_notify(struct notifier_block *nb,
2066                                         unsigned long val, void *bd)
2067 {
2068         struct backlight_device *backlight = bd;
2069         struct acpi_video_bus *video;
2070
2071         /* acpi_video_verify_backlight_support only cares about raw devices */
2072         if (backlight->props.type != BACKLIGHT_RAW)
2073                 return NOTIFY_DONE;
2074
2075         video = container_of(nb, struct acpi_video_bus, backlight_nb);
2076
2077         switch (val) {
2078         case BACKLIGHT_REGISTERED:
2079                 if (!acpi_video_verify_backlight_support())
2080                         acpi_video_bus_unregister_backlight(video);
2081                 break;
2082         case BACKLIGHT_UNREGISTERED:
2083                 acpi_video_bus_register_backlight(video);
2084                 break;
2085         }
2086
2087         return NOTIFY_OK;
2088 }
2089
2090 static int acpi_video_bus_add_backlight_notify_handler(
2091                                                 struct acpi_video_bus *video)
2092 {
2093         int error;
2094
2095         video->backlight_nb.notifier_call = acpi_video_backlight_notify;
2096         video->backlight_nb.priority = 0;
2097         error = backlight_register_notifier(&video->backlight_nb);
2098         if (error == 0)
2099                 video->backlight_notifier_registered = true;
2100
2101         return error;
2102 }
2103
2104 static int acpi_video_bus_remove_backlight_notify_handler(
2105                                                 struct acpi_video_bus *video)
2106 {
2107         if (!video->backlight_notifier_registered)
2108                 return 0;
2109
2110         video->backlight_notifier_registered = false;
2111
2112         return backlight_unregister_notifier(&video->backlight_nb);
2113 }
2114
2115 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
2116 {
2117         struct acpi_video_device *dev, *next;
2118
2119         mutex_lock(&video->device_list_lock);
2120         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
2121                 list_del(&dev->entry);
2122                 kfree(dev);
2123         }
2124         mutex_unlock(&video->device_list_lock);
2125
2126         return 0;
2127 }
2128
2129 static int instance;
2130
2131 static int acpi_video_bus_add(struct acpi_device *device)
2132 {
2133         struct acpi_video_bus *video;
2134         int error;
2135         acpi_status status;
2136
2137         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
2138                                 device->parent->handle, 1,
2139                                 acpi_video_bus_match, NULL,
2140                                 device, NULL);
2141         if (status == AE_ALREADY_EXISTS) {
2142                 printk(KERN_WARNING FW_BUG
2143                         "Duplicate ACPI video bus devices for the"
2144                         " same VGA controller, please try module "
2145                         "parameter \"video.allow_duplicates=1\""
2146                         "if the current driver doesn't work.\n");
2147                 if (!allow_duplicates)
2148                         return -ENODEV;
2149         }
2150
2151         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
2152         if (!video)
2153                 return -ENOMEM;
2154
2155         /* a hack to fix the duplicate name "VID" problem on T61 */
2156         if (!strcmp(device->pnp.bus_id, "VID")) {
2157                 if (instance)
2158                         device->pnp.bus_id[3] = '0' + instance;
2159                 instance++;
2160         }
2161         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
2162         if (!strcmp(device->pnp.bus_id, "VGA")) {
2163                 if (instance)
2164                         device->pnp.bus_id[3] = '0' + instance;
2165                 instance++;
2166         }
2167
2168         video->device = device;
2169         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
2170         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2171         device->driver_data = video;
2172
2173         acpi_video_bus_find_cap(video);
2174         error = acpi_video_bus_check(video);
2175         if (error)
2176                 goto err_free_video;
2177
2178         mutex_init(&video->device_list_lock);
2179         INIT_LIST_HEAD(&video->video_device_list);
2180
2181         error = acpi_video_bus_get_devices(video, device);
2182         if (error)
2183                 goto err_put_video;
2184
2185         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
2186                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
2187                video->flags.multihead ? "yes" : "no",
2188                video->flags.rom ? "yes" : "no",
2189                video->flags.post ? "yes" : "no");
2190         mutex_lock(&video_list_lock);
2191         list_add_tail(&video->entry, &video_bus_head);
2192         mutex_unlock(&video_list_lock);
2193
2194         acpi_video_bus_register_backlight(video);
2195         acpi_video_bus_add_notify_handler(video);
2196         acpi_video_bus_add_backlight_notify_handler(video);
2197
2198         return 0;
2199
2200 err_put_video:
2201         acpi_video_bus_put_devices(video);
2202         kfree(video->attached_array);
2203 err_free_video:
2204         kfree(video);
2205         device->driver_data = NULL;
2206
2207         return error;
2208 }
2209
2210 static int acpi_video_bus_remove(struct acpi_device *device)
2211 {
2212         struct acpi_video_bus *video = NULL;
2213
2214
2215         if (!device || !acpi_driver_data(device))
2216                 return -EINVAL;
2217
2218         video = acpi_driver_data(device);
2219
2220         acpi_video_bus_remove_backlight_notify_handler(video);
2221         acpi_video_bus_remove_notify_handler(video);
2222         acpi_video_bus_unregister_backlight(video);
2223         acpi_video_bus_put_devices(video);
2224
2225         mutex_lock(&video_list_lock);
2226         list_del(&video->entry);
2227         mutex_unlock(&video_list_lock);
2228
2229         kfree(video->attached_array);
2230         kfree(video);
2231
2232         return 0;
2233 }
2234
2235 static int __init is_i740(struct pci_dev *dev)
2236 {
2237         if (dev->device == 0x00D1)
2238                 return 1;
2239         if (dev->device == 0x7000)
2240                 return 1;
2241         return 0;
2242 }
2243
2244 static int __init intel_opregion_present(void)
2245 {
2246         int opregion = 0;
2247         struct pci_dev *dev = NULL;
2248         u32 address;
2249
2250         for_each_pci_dev(dev) {
2251                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2252                         continue;
2253                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2254                         continue;
2255                 /* We don't want to poke around undefined i740 registers */
2256                 if (is_i740(dev))
2257                         continue;
2258                 pci_read_config_dword(dev, 0xfc, &address);
2259                 if (!address)
2260                         continue;
2261                 opregion = 1;
2262         }
2263         return opregion;
2264 }
2265
2266 int acpi_video_register(void)
2267 {
2268         int result = 0;
2269         if (register_count) {
2270                 /*
2271                  * if the function of acpi_video_register is already called,
2272                  * don't register the acpi_vide_bus again and return no error.
2273                  */
2274                 return 0;
2275         }
2276
2277         mutex_init(&video_list_lock);
2278         INIT_LIST_HEAD(&video_bus_head);
2279
2280         result = acpi_bus_register_driver(&acpi_video_bus);
2281         if (result < 0)
2282                 return -ENODEV;
2283
2284         /*
2285          * When the acpi_video_bus is loaded successfully, increase
2286          * the counter reference.
2287          */
2288         register_count = 1;
2289
2290         return 0;
2291 }
2292 EXPORT_SYMBOL(acpi_video_register);
2293
2294 void acpi_video_unregister(void)
2295 {
2296         if (!register_count) {
2297                 /*
2298                  * If the acpi video bus is already unloaded, don't
2299                  * unload it again and return directly.
2300                  */
2301                 return;
2302         }
2303         acpi_bus_unregister_driver(&acpi_video_bus);
2304
2305         register_count = 0;
2306
2307         return;
2308 }
2309 EXPORT_SYMBOL(acpi_video_unregister);
2310
2311 void acpi_video_unregister_backlight(void)
2312 {
2313         struct acpi_video_bus *video;
2314
2315         if (!register_count)
2316                 return;
2317
2318         mutex_lock(&video_list_lock);
2319         list_for_each_entry(video, &video_bus_head, entry)
2320                 acpi_video_bus_unregister_backlight(video);
2321         mutex_unlock(&video_list_lock);
2322 }
2323 EXPORT_SYMBOL(acpi_video_unregister_backlight);
2324
2325 /*
2326  * This is kind of nasty. Hardware using Intel chipsets may require
2327  * the video opregion code to be run first in order to initialise
2328  * state before any ACPI video calls are made. To handle this we defer
2329  * registration of the video class until the opregion code has run.
2330  */
2331
2332 static int __init acpi_video_init(void)
2333 {
2334         dmi_check_system(video_dmi_table);
2335
2336         if (intel_opregion_present())
2337                 return 0;
2338
2339         return acpi_video_register();
2340 }
2341
2342 static void __exit acpi_video_exit(void)
2343 {
2344         acpi_video_unregister();
2345
2346         return;
2347 }
2348
2349 module_init(acpi_video_init);
2350 module_exit(acpi_video_exit);