drivers/acpi/video_detect.c

   1 /*
   2  *  Copyright (C) 2015       Red Hat Inc.
   3  *                           Hans de Goede <[email protected]>
   4  *  Copyright (C) 2008       SuSE Linux Products GmbH
   5  *                           Thomas Renninger <[email protected]>
   6  *
   7  *  May be copied or modified under the terms of the GNU General Public License
   8  *
   9  * video_detect.c:
  10  * After PCI devices are glued with ACPI devices
  11  * acpi_get_pci_dev() can be called to identify ACPI graphics
  12  * devices for which a real graphics card is plugged in
  13  *
  14  * Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B)
  15  * are available, video.ko should be used to handle the device.
  16  *
  17  * Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop,
  18  * sony_acpi,... can take care about backlight brightness.
  19  *
  20  * Backlight drivers can use acpi_video_get_backlight_type() to determine which
  21  * driver should handle the backlight. RAW/GPU-driver backlight drivers must
  22  * use the acpi_video_backlight_use_native() helper for this.
  23  *
  24  * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
  25  * this file will not be compiled and acpi_video_get_backlight_type() will
  26  * always return acpi_backlight_vendor.
  27  */
  28
  29 #include <linux/export.h>
  30 #include <linux/acpi.h>
  31 #include <linux/apple-gmux.h>
  32 #include <linux/backlight.h>
  33 #include <linux/dmi.h>
  34 #include <linux/module.h>
  35 #include <linux/pci.h>
  36 #include <linux/platform_data/x86/nvidia-wmi-ec-backlight.h>
  37 #include <linux/pnp.h>
  38 #include <linux/types.h>
  39 #include <linux/workqueue.h>
  40 #include <acpi/video.h>
  41
  42 static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
  43 static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
  44
  45 static void acpi_video_parse_cmdline(void)
  46 {
  47         if (!strcmp("vendor", acpi_video_backlight_string))
  48                 acpi_backlight_cmdline = acpi_backlight_vendor;
  49         if (!strcmp("video", acpi_video_backlight_string))
  50                 acpi_backlight_cmdline = acpi_backlight_video;
  51         if (!strcmp("native", acpi_video_backlight_string))
  52                 acpi_backlight_cmdline = acpi_backlight_native;
  53         if (!strcmp("nvidia_wmi_ec", acpi_video_backlight_string))
  54                 acpi_backlight_cmdline = acpi_backlight_nvidia_wmi_ec;
  55         if (!strcmp("apple_gmux", acpi_video_backlight_string))
  56                 acpi_backlight_cmdline = acpi_backlight_apple_gmux;
  57         if (!strcmp("none", acpi_video_backlight_string))
  58                 acpi_backlight_cmdline = acpi_backlight_none;
  59 }
  60
  61 static acpi_status
  62 find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
  63 {
  64         struct acpi_device *acpi_dev = acpi_fetch_acpi_dev(handle);
  65         long *cap = context;
  66         struct pci_dev *dev;
  67
  68         static const struct acpi_device_id video_ids[] = {
  69                 {ACPI_VIDEO_HID, 0},
  70                 {"", 0},
  71         };
  72
  73         if (acpi_dev && !acpi_match_device_ids(acpi_dev, video_ids)) {
  74                 dev = acpi_get_pci_dev(handle);
  75                 if (!dev)
  76                         return AE_OK;
  77                 pci_dev_put(dev);
  78                 *cap |= acpi_is_video_device(handle);
  79         }
  80         return AE_OK;
  81 }
  82
  83 /* This depends on ACPI_WMI which is X86 only */
  84 #ifdef CONFIG_X86
  85 static bool nvidia_wmi_ec_supported(void)
  86 {
  87         struct wmi_brightness_args args = {
  88                 .mode = WMI_BRIGHTNESS_MODE_GET,
  89                 .val = 0,
  90                 .ret = 0,
  91         };
  92         struct acpi_buffer buf = { (acpi_size)sizeof(args), &args };
  93         acpi_status status;
  94
  95         status = wmi_evaluate_method(WMI_BRIGHTNESS_GUID, 0,
  96                                      WMI_BRIGHTNESS_METHOD_SOURCE, &buf, &buf);
  97         if (ACPI_FAILURE(status))
  98                 return false;
  99
 100         /*
 101          * If brightness is handled by the EC then nvidia-wmi-ec-backlight
 102          * should be used, else the GPU driver(s) should be used.
 103          */
 104         return args.ret == WMI_BRIGHTNESS_SOURCE_EC;
 105 }
 106 #else
 107 static bool nvidia_wmi_ec_supported(void)
 108 {
 109         return false;
 110 }
 111 #endif
 112
 113 /* Force to use vendor driver when the ACPI device is known to be
 114  * buggy */
 115 static int video_detect_force_vendor(const struct dmi_system_id *d)
 116 {
 117         acpi_backlight_dmi = acpi_backlight_vendor;
 118         return 0;
 119 }
 120
 121 static int video_detect_force_video(const struct dmi_system_id *d)
 122 {
 123         acpi_backlight_dmi = acpi_backlight_video;
 124         return 0;
 125 }
 126
 127 static int video_detect_force_native(const struct dmi_system_id *d)
 128 {
 129         acpi_backlight_dmi = acpi_backlight_native;
 130         return 0;
 131 }
 132
 133 static int video_detect_force_none(const struct dmi_system_id *d)
 134 {
 135         acpi_backlight_dmi = acpi_backlight_none;
 136         return 0;
 137 }
 138
 139 static const struct dmi_system_id video_detect_dmi_table[] = {
 140         /*
 141          * Models which should use the vendor backlight interface,
 142          * because of broken ACPI video backlight control.
 143          */
 144         {
 145          /* https://bugzilla.redhat.com/show_bug.cgi?id=1128309 */
 146          .callback = video_detect_force_vendor,
 147          /* Acer KAV80 */
 148          .matches = {
 149                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 150                 DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
 151                 },
 152         },
 153         {
 154          .callback = video_detect_force_vendor,
 155          /* Asus UL30VT */
 156          .matches = {
 157                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 158                 DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
 159                 },
 160         },
 161         {
 162          .callback = video_detect_force_vendor,
 163          /* Asus UL30A */
 164          .matches = {
 165                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 166                 DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
 167                 },
 168         },
 169         {
 170          .callback = video_detect_force_vendor,
 171          /* Asus X55U */
 172          .matches = {
 173                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 174                 DMI_MATCH(DMI_PRODUCT_NAME, "X55U"),
 175                 },
 176         },
 177         {
 178          /* https://bugs.launchpad.net/bugs/1000146 */
 179          .callback = video_detect_force_vendor,
 180          /* Asus X101CH */
 181          .matches = {
 182                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 183                 DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
 184                 },
 185         },
 186         {
 187          .callback = video_detect_force_vendor,
 188          /* Asus X401U */
 189          .matches = {
 190                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 191                 DMI_MATCH(DMI_PRODUCT_NAME, "X401U"),
 192                 },
 193         },
 194         {
 195          .callback = video_detect_force_vendor,
 196          /* Asus X501U */
 197          .matches = {
 198                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 199                 DMI_MATCH(DMI_PRODUCT_NAME, "X501U"),
 200                 },
 201         },
 202         {
 203          /* https://bugs.launchpad.net/bugs/1000146 */
 204          .callback = video_detect_force_vendor,
 205          /* Asus 1015CX */
 206          .matches = {
 207                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 208                 DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
 209                 },
 210         },
 211         {
 212          .callback = video_detect_force_vendor,
 213          /* Samsung N150/N210/N220 */
 214          .matches = {
 215                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 216                 DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
 217                 DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
 218                 },
 219         },
 220         {
 221          .callback = video_detect_force_vendor,
 222          /* Samsung NF110/NF210/NF310 */
 223          .matches = {
 224                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 225                 DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
 226                 DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
 227                 },
 228         },
 229         {
 230          .callback = video_detect_force_vendor,
 231          /* Samsung NC210 */
 232          .matches = {
 233                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 234                 DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
 235                 DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
 236                 },
 237         },
 238         {
 239          .callback = video_detect_force_vendor,
 240          /* Xiaomi Mi Pad 2 */
 241          .matches = {
 242                         DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
 243                         DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
 244                 },
 245         },
 246
 247         /*
 248          * Models which should use the vendor backlight interface,
 249          * because of broken native backlight control.
 250          */
 251         {
 252          .callback = video_detect_force_vendor,
 253          /* Sony Vaio PCG-FRV35 */
 254          .matches = {
 255                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 256                 DMI_MATCH(DMI_PRODUCT_NAME, "PCG-FRV35"),
 257                 },
 258         },
 259
 260         /*
 261          * Toshiba models with Transflective display, these need to use
 262          * the toshiba_acpi vendor driver for proper Transflective handling.
 263          */
 264         {
 265          .callback = video_detect_force_vendor,
 266          .matches = {
 267                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 268                 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R500"),
 269                 },
 270         },
 271         {
 272          .callback = video_detect_force_vendor,
 273          .matches = {
 274                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 275                 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R600"),
 276                 },
 277         },
 278
 279         /*
 280          * These models have a working acpi_video backlight control, and using
 281          * native backlight causes a regression where backlight does not work
 282          * when userspace is not handling brightness key events. Disable
 283          * native_backlight on these to fix this:
 284          * https://bugzilla.kernel.org/show_bug.cgi?id=81691
 285          */
 286         {
 287          .callback = video_detect_force_video,
 288          /* ThinkPad T420 */
 289          .matches = {
 290                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 291                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
 292                 },
 293         },
 294         {
 295          .callback = video_detect_force_video,
 296          /* ThinkPad T520 */
 297          .matches = {
 298                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 299                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
 300                 },
 301         },
 302         {
 303          .callback = video_detect_force_video,
 304          /* ThinkPad X201s */
 305          .matches = {
 306                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 307                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
 308                 },
 309         },
 310         {
 311          .callback = video_detect_force_video,
 312          /* ThinkPad X201T */
 313          .matches = {
 314                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 315                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
 316                 },
 317         },
 318
 319         /* The native backlight controls do not work on some older machines */
 320         {
 321          /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
 322          .callback = video_detect_force_video,
 323          /* HP ENVY 15 Notebook */
 324          .matches = {
 325                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 326                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
 327                 },
 328         },
 329         {
 330          .callback = video_detect_force_video,
 331          /* SAMSUNG 870Z5E/880Z5E/680Z5E */
 332          .matches = {
 333                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 334                 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
 335                 },
 336         },
 337         {
 338          .callback = video_detect_force_video,
 339          /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
 340          .matches = {
 341                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 342                 DMI_MATCH(DMI_PRODUCT_NAME,
 343                           "370R4E/370R4V/370R5E/3570RE/370R5V"),
 344                 },
 345         },
 346         {
 347          /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
 348          .callback = video_detect_force_video,
 349          /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
 350          .matches = {
 351                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 352                 DMI_MATCH(DMI_PRODUCT_NAME,
 353                           "3570R/370R/470R/450R/510R/4450RV"),
 354                 },
 355         },
 356         {
 357          /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
 358          .callback = video_detect_force_video,
 359          /* SAMSUNG 670Z5E */
 360          .matches = {
 361                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 362                 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
 363                 },
 364         },
 365         {
 366          /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
 367          .callback = video_detect_force_video,
 368          /* SAMSUNG 730U3E/740U3E */
 369          .matches = {
 370                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 371                 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
 372                 },
 373         },
 374         {
 375          /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
 376          .callback = video_detect_force_video,
 377          /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
 378          .matches = {
 379                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 380                 DMI_MATCH(DMI_PRODUCT_NAME,
 381                           "900X3C/900X3D/900X3E/900X4C/900X4D"),
 382                 },
 383         },
 384         {
 385          /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
 386          .callback = video_detect_force_video,
 387          /* Dell XPS14 L421X */
 388          .matches = {
 389                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 390                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
 391                 },
 392         },
 393         {
 394          /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
 395          .callback = video_detect_force_video,
 396          /* Dell XPS15 L521X */
 397          .matches = {
 398                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 399                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
 400                 },
 401         },
 402         {
 403          /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
 404          .callback = video_detect_force_video,
 405          /* SAMSUNG 530U4E/540U4E */
 406          .matches = {
 407                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 408                 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
 409                 },
 410         },
 411         {
 412          /* https://bugs.launchpad.net/bugs/1894667 */
 413          .callback = video_detect_force_video,
 414          /* HP 635 Notebook */
 415          .matches = {
 416                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 417                 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
 418                 },
 419         },
 420
 421         /* Non win8 machines which need native backlight nevertheless */
 422         {
 423          /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
 424          .callback = video_detect_force_native,
 425          /* Lenovo Ideapad S405 */
 426          .matches = {
 427                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 428                 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
 429                 },
 430         },
 431         {
 432          /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
 433          .callback = video_detect_force_native,
 434          /* Lenovo Ideapad Z570 */
 435          .matches = {
 436                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 437                 DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
 438                 },
 439         },
 440         {
 441          .callback = video_detect_force_native,
 442          /* Lenovo E41-25 */
 443          .matches = {
 444                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 445                 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
 446                 },
 447         },
 448         {
 449          .callback = video_detect_force_native,
 450          /* Lenovo E41-45 */
 451          .matches = {
 452                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 453                 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
 454                 },
 455         },
 456         {
 457          /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
 458          .callback = video_detect_force_native,
 459          /* Apple MacBook Pro 12,1 */
 460          .matches = {
 461                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 462                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
 463                 },
 464         },
 465         {
 466          .callback = video_detect_force_native,
 467          /* Dell Inspiron N4010 */
 468          .matches = {
 469                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 470                 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"),
 471                 },
 472         },
 473         {
 474          .callback = video_detect_force_native,
 475          /* Dell Vostro V131 */
 476          .matches = {
 477                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 478                 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 479                 },
 480         },
 481         {
 482          /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
 483          .callback = video_detect_force_native,
 484          /* Dell XPS 17 L702X */
 485          .matches = {
 486                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 487                 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
 488                 },
 489         },
 490         {
 491          .callback = video_detect_force_native,
 492          /* Dell Precision 7510 */
 493          .matches = {
 494                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 495                 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
 496                 },
 497         },
 498         {
 499          .callback = video_detect_force_native,
 500          /* Acer Aspire 4810T */
 501          .matches = {
 502                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 503                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 4810T"),
 504                 },
 505         },
 506         {
 507          .callback = video_detect_force_native,
 508          /* Acer Aspire 5738z */
 509          .matches = {
 510                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 511                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
 512                 DMI_MATCH(DMI_BOARD_NAME, "JV50"),
 513                 },
 514         },
 515         {
 516          /* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */
 517          .callback = video_detect_force_native,
 518          /* Acer Aspire 5741 */
 519          .matches = {
 520                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 521                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
 522                 },
 523         },
 524         {
 525          /* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */
 526          .callback = video_detect_force_native,
 527          /* Acer Aspire 5750 */
 528          .matches = {
 529                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 530                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
 531                 },
 532         },
 533         {
 534          /* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */
 535          .callback = video_detect_force_native,
 536          /* Acer Extensa 5235 */
 537          .matches = {
 538                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 539                 DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
 540                 },
 541         },
 542         {
 543          .callback = video_detect_force_native,
 544          /* Acer TravelMate 4750 */
 545          .matches = {
 546                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 547                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
 548                 },
 549         },
 550         {
 551          /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
 552          .callback = video_detect_force_native,
 553          /* Acer TravelMate 5735Z */
 554          .matches = {
 555                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 556                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
 557                 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
 558                 },
 559         },
 560         {
 561          /* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */
 562          .callback = video_detect_force_native,
 563          /* Acer TravelMate 5760 */
 564          .matches = {
 565                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 566                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
 567                 },
 568         },
 569         {
 570          .callback = video_detect_force_native,
 571          /* ASUSTeK COMPUTER INC. GA401 */
 572          .matches = {
 573                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 574                 DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
 575                 },
 576         },
 577         {
 578          .callback = video_detect_force_native,
 579          /* ASUSTeK COMPUTER INC. GA502 */
 580          .matches = {
 581                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 582                 DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
 583                 },
 584         },
 585         {
 586          .callback = video_detect_force_native,
 587          /* ASUSTeK COMPUTER INC. GA503 */
 588          .matches = {
 589                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 590                 DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
 591                 },
 592         },
 593         {
 594          .callback = video_detect_force_native,
 595          /* Asus U46E */
 596          .matches = {
 597                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 598                 DMI_MATCH(DMI_PRODUCT_NAME, "U46E"),
 599                 },
 600         },
 601         {
 602          .callback = video_detect_force_native,
 603          /* Asus UX303UB */
 604          .matches = {
 605                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 606                 DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
 607                 },
 608         },
 609         {
 610          .callback = video_detect_force_native,
 611          /* HP EliteBook 8460p */
 612          .matches = {
 613                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 614                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8460p"),
 615                 },
 616         },
 617         {
 618          .callback = video_detect_force_native,
 619          /* HP Pavilion g6-1d80nr / B4U19UA */
 620          .matches = {
 621                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 622                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
 623                 DMI_MATCH(DMI_PRODUCT_SKU, "B4U19UA"),
 624                 },
 625         },
 626         {
 627          .callback = video_detect_force_native,
 628          /* Samsung N150P */
 629          .matches = {
 630                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 631                 DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
 632                 DMI_MATCH(DMI_BOARD_NAME, "N150P"),
 633                 },
 634         },
 635         {
 636          .callback = video_detect_force_native,
 637          /* Samsung N145P/N250P/N260P */
 638          .matches = {
 639                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 640                 DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
 641                 DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
 642                 },
 643         },
 644         {
 645          .callback = video_detect_force_native,
 646          /* Samsung N250P */
 647          .matches = {
 648                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 649                 DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
 650                 DMI_MATCH(DMI_BOARD_NAME, "N250P"),
 651                 },
 652         },
 653         {
 654          /* https://bugzilla.kernel.org/show_bug.cgi?id=202401 */
 655          .callback = video_detect_force_native,
 656          /* Sony Vaio VPCEH3U1E */
 657          .matches = {
 658                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 659                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
 660                 },
 661         },
 662         {
 663          .callback = video_detect_force_native,
 664          /* Sony Vaio VPCY11S1E */
 665          .matches = {
 666                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 667                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCY11S1E"),
 668                 },
 669         },
 670
 671         /*
 672          * These Toshibas have a broken acpi-video interface for brightness
 673          * control. They also have an issue where the panel is off after
 674          * suspend until a special firmware call is made to turn it back
 675          * on. This is handled by the toshiba_acpi kernel module, so that
 676          * module must be enabled for these models to work correctly.
 677          */
 678         {
 679          /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
 680          .callback = video_detect_force_native,
 681          /* Toshiba Portégé R700 */
 682          .matches = {
 683                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 684                 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
 685                 },
 686         },
 687         {
 688          /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
 689          /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
 690          .callback = video_detect_force_native,
 691          /* Toshiba Satellite/Portégé R830 */
 692          .matches = {
 693                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 694                 DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
 695                 },
 696         },
 697         {
 698          .callback = video_detect_force_native,
 699          /* Toshiba Satellite/Portégé Z830 */
 700          .matches = {
 701                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 702                 DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
 703                 },
 704         },
 705
 706         /*
 707          * Models which have nvidia-ec-wmi support, but should not use it.
 708          * Note this indicates a likely firmware bug on these models and should
 709          * be revisited if/when Linux gets support for dynamic mux mode.
 710          */
 711         {
 712          .callback = video_detect_force_native,
 713          /* Dell G15 5515 */
 714          .matches = {
 715                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 716                 DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
 717                 },
 718         },
 719
 720         /*
 721          * Desktops which falsely report a backlight and which our heuristics
 722          * for this do not catch.
 723          */
 724         {
 725          .callback = video_detect_force_none,
 726          /* Dell OptiPlex 9020M */
 727          .matches = {
 728                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 729                 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
 730                 },
 731         },
 732         {
 733          .callback = video_detect_force_none,
 734          /* GIGABYTE GB-BXBT-2807 */
 735          .matches = {
 736                 DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
 737                 DMI_MATCH(DMI_PRODUCT_NAME, "GB-BXBT-2807"),
 738                 },
 739         },
 740         {
 741          .callback = video_detect_force_none,
 742          /* MSI MS-7721 */
 743          .matches = {
 744                 DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 745                 DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"),
 746                 },
 747         },
 748         { },
 749 };
 750
 751 static bool google_cros_ec_present(void)
 752 {
 753         return acpi_dev_found("GOOG0004") || acpi_dev_found("GOOG000C");
 754 }
 755
 756 /*
 757  * Windows 8 and newer no longer use the ACPI video interface, so it often
 758  * does not work. So on win8+ systems prefer native brightness control.
 759  * Chromebooks should always prefer native backlight control.
 760  */
 761 static bool prefer_native_over_acpi_video(void)
 762 {
 763         return acpi_osi_is_win8() || google_cros_ec_present();
 764 }
 765
 766 /*
 767  * Determine which type of backlight interface to use on this system,
 768  * First check cmdline, then dmi quirks, then do autodetect.
 769  */
 770 static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
 771 {
 772         static DEFINE_MUTEX(init_mutex);
 773         static bool nvidia_wmi_ec_present;
 774         static bool apple_gmux_present;
 775         static bool native_available;
 776         static bool init_done;
 777         static long video_caps;
 778
 779         /* Parse cmdline, dmi and acpi only once */
 780         mutex_lock(&init_mutex);
 781         if (!init_done) {
 782                 acpi_video_parse_cmdline();
 783                 dmi_check_system(video_detect_dmi_table);
 784                 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 785                                     ACPI_UINT32_MAX, find_video, NULL,
 786                                     &video_caps, NULL);
 787                 nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
 788                 apple_gmux_present = apple_gmux_detect(NULL, NULL);
 789                 init_done = true;
 790         }
 791         if (native)
 792                 native_available = true;
 793         mutex_unlock(&init_mutex);
 794
 795         /*
 796          * The below heuristics / detection steps are in order of descending
 797          * presedence. The commandline takes presedence over anything else.
 798          */
 799         if (acpi_backlight_cmdline != acpi_backlight_undef)
 800                 return acpi_backlight_cmdline;
 801
 802         /* DMI quirks override any autodetection. */
 803         if (acpi_backlight_dmi != acpi_backlight_undef)
 804                 return acpi_backlight_dmi;
 805
 806         /* Special cases such as nvidia_wmi_ec and apple gmux. */
 807         if (nvidia_wmi_ec_present)
 808                 return acpi_backlight_nvidia_wmi_ec;
 809
 810         if (apple_gmux_present)
 811                 return acpi_backlight_apple_gmux;
 812
 813         /* Use ACPI video if available, except when native should be preferred. */
 814         if ((video_caps & ACPI_VIDEO_BACKLIGHT) &&
 815              !(native_available && prefer_native_over_acpi_video()))
 816                 return acpi_backlight_video;
 817
 818         /* Use native if available */
 819         if (native_available)
 820                 return acpi_backlight_native;
 821
 822         /* No ACPI video/native (old hw), use vendor specific fw methods. */
 823         return acpi_backlight_vendor;
 824 }
 825
 826 enum acpi_backlight_type acpi_video_get_backlight_type(void)
 827 {
 828         return __acpi_video_get_backlight_type(false);
 829 }
 830 EXPORT_SYMBOL(acpi_video_get_backlight_type);
 831
 832 bool acpi_video_backlight_use_native(void)
 833 {
 834         return __acpi_video_get_backlight_type(true) == acpi_backlight_native;
 835 }
 836 EXPORT_SYMBOL(acpi_video_backlight_use_native);