drivers/acpi/video_detect.c

   1 /*
   2  *  Copyright (C) 2015       Red Hat Inc.
   3  *                           Hans de Goede <hdegoede@redhat.com>
   4  *  Copyright (C) 2008       SuSE Linux Products GmbH
   5  *                           Thomas Renninger <trenn@suse.de>
   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          .callback = video_detect_force_vendor,
 179          /* Asus X101CH */
 180          .matches = {
 181                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 182                 DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
 183                 },
 184         },
 185         {
 186          .callback = video_detect_force_vendor,
 187          /* Asus X401U */
 188          .matches = {
 189                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 190                 DMI_MATCH(DMI_PRODUCT_NAME, "X401U"),
 191                 },
 192         },
 193         {
 194          .callback = video_detect_force_vendor,
 195          /* Asus X501U */
 196          .matches = {
 197                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 198                 DMI_MATCH(DMI_PRODUCT_NAME, "X501U"),
 199                 },
 200         },
 201         {
 202          .callback = video_detect_force_vendor,
 203          /* Asus 1015CX */
 204          .matches = {
 205                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 206                 DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
 207                 },
 208         },
 209         {
 210          .callback = video_detect_force_vendor,
 211          /* Samsung N150/N210/N220 */
 212          .matches = {
 213                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 214                 DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
 215                 DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
 216                 },
 217         },
 218         {
 219          .callback = video_detect_force_vendor,
 220          /* Samsung NF110/NF210/NF310 */
 221          .matches = {
 222                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 223                 DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
 224                 DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
 225                 },
 226         },
 227         {
 228          .callback = video_detect_force_vendor,
 229          /* Samsung NC210 */
 230          .matches = {
 231                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 232                 DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
 233                 DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
 234                 },
 235         },
 236         {
 237          .callback = video_detect_force_vendor,
 238          /* Xiaomi Mi Pad 2 */
 239          .matches = {
 240                         DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
 241                         DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
 242                 },
 243         },
 244
 245         /*
 246          * Models which should use the vendor backlight interface,
 247          * because of broken native backlight control.
 248          */
 249         {
 250          .callback = video_detect_force_vendor,
 251          /* Sony Vaio PCG-FRV35 */
 252          .matches = {
 253                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 254                 DMI_MATCH(DMI_PRODUCT_NAME, "PCG-FRV35"),
 255                 },
 256         },
 257
 258         /*
 259          * Toshiba models with Transflective display, these need to use
 260          * the toshiba_acpi vendor driver for proper Transflective handling.
 261          */
 262         {
 263          .callback = video_detect_force_vendor,
 264          .matches = {
 265                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 266                 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R500"),
 267                 },
 268         },
 269         {
 270          .callback = video_detect_force_vendor,
 271          .matches = {
 272                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 273                 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R600"),
 274                 },
 275         },
 276
 277         /*
 278          * Models which need acpi_video backlight control where the GPU drivers
 279          * do not call acpi_video_register_backlight() because no internal panel
 280          * is detected. Typically these are all-in-ones (monitors with builtin
 281          * PC) where the panel connection shows up as regular DP instead of eDP.
 282          */
 283         {
 284          .callback = video_detect_force_video,
 285          /* Apple iMac14,1 */
 286          .matches = {
 287                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 288                 DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,1"),
 289                 },
 290         },
 291         {
 292          .callback = video_detect_force_video,
 293          /* Apple iMac14,2 */
 294          .matches = {
 295                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 296                 DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,2"),
 297                 },
 298         },
 299
 300         /*
 301          * Older models with nvidia GPU which need acpi_video backlight
 302          * control and where the old nvidia binary driver series does not
 303          * call acpi_video_register_backlight().
 304          */
 305         {
 306          .callback = video_detect_force_video,
 307          /* ThinkPad W530 */
 308          .matches = {
 309                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 310                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
 311                 },
 312         },
 313
 314         /*
 315          * These models have a working acpi_video backlight control, and using
 316          * native backlight causes a regression where backlight does not work
 317          * when userspace is not handling brightness key events. Disable
 318          * native_backlight on these to fix this:
 319          * https://bugzilla.kernel.org/show_bug.cgi?id=81691
 320          */
 321         {
 322          .callback = video_detect_force_video,
 323          /* ThinkPad T420 */
 324          .matches = {
 325                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 326                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
 327                 },
 328         },
 329         {
 330          .callback = video_detect_force_video,
 331          /* ThinkPad T520 */
 332          .matches = {
 333                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 334                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
 335                 },
 336         },
 337         {
 338          .callback = video_detect_force_video,
 339          /* ThinkPad X201s */
 340          .matches = {
 341                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 342                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
 343                 },
 344         },
 345         {
 346          .callback = video_detect_force_video,
 347          /* ThinkPad X201T */
 348          .matches = {
 349                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 350                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
 351                 },
 352         },
 353
 354         /* The native backlight controls do not work on some older machines */
 355         {
 356          /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
 357          .callback = video_detect_force_video,
 358          /* HP ENVY 15 Notebook */
 359          .matches = {
 360                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 361                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
 362                 },
 363         },
 364         {
 365          .callback = video_detect_force_video,
 366          /* SAMSUNG 870Z5E/880Z5E/680Z5E */
 367          .matches = {
 368                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 369                 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
 370                 },
 371         },
 372         {
 373          .callback = video_detect_force_video,
 374          /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
 375          .matches = {
 376                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 377                 DMI_MATCH(DMI_PRODUCT_NAME,
 378                           "370R4E/370R4V/370R5E/3570RE/370R5V"),
 379                 },
 380         },
 381         {
 382          /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
 383          .callback = video_detect_force_video,
 384          /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
 385          .matches = {
 386                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 387                 DMI_MATCH(DMI_PRODUCT_NAME,
 388                           "3570R/370R/470R/450R/510R/4450RV"),
 389                 },
 390         },
 391         {
 392          /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
 393          .callback = video_detect_force_video,
 394          /* SAMSUNG 670Z5E */
 395          .matches = {
 396                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 397                 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
 398                 },
 399         },
 400         {
 401          /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
 402          .callback = video_detect_force_video,
 403          /* SAMSUNG 730U3E/740U3E */
 404          .matches = {
 405                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 406                 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
 407                 },
 408         },
 409         {
 410          /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
 411          .callback = video_detect_force_video,
 412          /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
 413          .matches = {
 414                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 415                 DMI_MATCH(DMI_PRODUCT_NAME,
 416                           "900X3C/900X3D/900X3E/900X4C/900X4D"),
 417                 },
 418         },
 419         {
 420          /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
 421          .callback = video_detect_force_video,
 422          /* Dell XPS14 L421X */
 423          .matches = {
 424                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 425                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
 426                 },
 427         },
 428         {
 429          /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
 430          .callback = video_detect_force_video,
 431          /* Dell XPS15 L521X */
 432          .matches = {
 433                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 434                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
 435                 },
 436         },
 437         {
 438          /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
 439          .callback = video_detect_force_video,
 440          /* SAMSUNG 530U4E/540U4E */
 441          .matches = {
 442                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 443                 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
 444                 },
 445         },
 446         /* https://bugs.launchpad.net/bugs/1894667 */
 447         {
 448          .callback = video_detect_force_video,
 449          /* HP 635 Notebook */
 450          .matches = {
 451                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 452                 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
 453                 },
 454         },
 455
 456         /* Non win8 machines which need native backlight nevertheless */
 457         {
 458          /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
 459          .callback = video_detect_force_native,
 460          /* Lenovo Ideapad S405 */
 461          .matches = {
 462                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 463                 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
 464                 },
 465         },
 466         {
 467          /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
 468          .callback = video_detect_force_native,
 469          /* Lenovo Ideapad Z570 */
 470          .matches = {
 471                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 472                 DMI_MATCH(DMI_PRODUCT_VERSION, "Ideapad Z570"),
 473                 },
 474         },
 475         {
 476          .callback = video_detect_force_native,
 477          /* Lenovo E41-25 */
 478          .matches = {
 479                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 480                 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
 481                 },
 482         },
 483         {
 484          .callback = video_detect_force_native,
 485          /* Lenovo E41-45 */
 486          .matches = {
 487                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 488                 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
 489                 },
 490         },
 491         {
 492          /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
 493          .callback = video_detect_force_native,
 494          /* Apple MacBook Pro 12,1 */
 495          .matches = {
 496                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 497                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
 498                 },
 499         },
 500         {
 501          .callback = video_detect_force_native,
 502          /* Dell Inspiron N4010 */
 503          .matches = {
 504                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 505                 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"),
 506                 },
 507         },
 508         {
 509          .callback = video_detect_force_native,
 510          /* Dell Vostro V131 */
 511          .matches = {
 512                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 513                 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 514                 },
 515         },
 516         {
 517          /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
 518          .callback = video_detect_force_native,
 519          /* Dell XPS 17 L702X */
 520          .matches = {
 521                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 522                 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
 523                 },
 524         },
 525         {
 526          .callback = video_detect_force_native,
 527          /* Dell Precision 7510 */
 528          .matches = {
 529                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 530                 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
 531                 },
 532         },
 533         {
 534          .callback = video_detect_force_native,
 535          /* Acer Aspire 4810T */
 536          .matches = {
 537                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 538                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 4810T"),
 539                 },
 540         },
 541         {
 542          .callback = video_detect_force_native,
 543          /* Acer Aspire 5738z */
 544          .matches = {
 545                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 546                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
 547                 DMI_MATCH(DMI_BOARD_NAME, "JV50"),
 548                 },
 549         },
 550         {
 551          /* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */
 552          .callback = video_detect_force_native,
 553          /* Acer Aspire 5741 */
 554          .matches = {
 555                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 556                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
 557                 },
 558         },
 559         {
 560          /* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */
 561          .callback = video_detect_force_native,
 562          /* Acer Aspire 5750 */
 563          .matches = {
 564                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 565                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
 566                 },
 567         },
 568         {
 569          /* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */
 570          .callback = video_detect_force_native,
 571          /* Acer Extensa 5235 */
 572          .matches = {
 573                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 574                 DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
 575                 },
 576         },
 577         {
 578          .callback = video_detect_force_native,
 579          /* Acer TravelMate 4750 */
 580          .matches = {
 581                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 582                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
 583                 },
 584         },
 585         {
 586          /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
 587          .callback = video_detect_force_native,
 588          /* Acer TravelMate 5735Z */
 589          .matches = {
 590                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 591                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
 592                 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
 593                 },
 594         },
 595         {
 596          /* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */
 597          .callback = video_detect_force_native,
 598          /* Acer TravelMate 5760 */
 599          .matches = {
 600                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 601                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
 602                 },
 603         },
 604         {
 605          .callback = video_detect_force_native,
 606          /* ASUSTeK COMPUTER INC. GA401 */
 607          .matches = {
 608                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 609                 DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
 610                 },
 611         },
 612         {
 613          .callback = video_detect_force_native,
 614          /* ASUSTeK COMPUTER INC. GA502 */
 615          .matches = {
 616                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 617                 DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
 618                 },
 619         },
 620         {
 621          .callback = video_detect_force_native,
 622          /* ASUSTeK COMPUTER INC. GA503 */
 623          .matches = {
 624                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 625                 DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
 626                 },
 627         },
 628         {
 629          .callback = video_detect_force_native,
 630          /* Asus U46E */
 631          .matches = {
 632                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 633                 DMI_MATCH(DMI_PRODUCT_NAME, "U46E"),
 634                 },
 635         },
 636         {
 637          .callback = video_detect_force_native,
 638          /* Asus UX303UB */
 639          .matches = {
 640                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 641                 DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
 642                 },
 643         },
 644         {
 645          .callback = video_detect_force_native,
 646          /* HP EliteBook 8460p */
 647          .matches = {
 648                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 649                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8460p"),
 650                 },
 651         },
 652         {
 653          .callback = video_detect_force_native,
 654          /* HP Pavilion g6-1d80nr / B4U19UA */
 655          .matches = {
 656                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 657                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
 658                 DMI_MATCH(DMI_PRODUCT_SKU, "B4U19UA"),
 659                 },
 660         },
 661         {
 662          .callback = video_detect_force_native,
 663          /* Samsung N150P */
 664          .matches = {
 665                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 666                 DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
 667                 DMI_MATCH(DMI_BOARD_NAME, "N150P"),
 668                 },
 669         },
 670         {
 671          .callback = video_detect_force_native,
 672          /* Samsung N145P/N250P/N260P */
 673          .matches = {
 674                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 675                 DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
 676                 DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
 677                 },
 678         },
 679         {
 680          .callback = video_detect_force_native,
 681          /* Samsung N250P */
 682          .matches = {
 683                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 684                 DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
 685                 DMI_MATCH(DMI_BOARD_NAME, "N250P"),
 686                 },
 687         },
 688         {
 689          /* https://bugzilla.kernel.org/show_bug.cgi?id=202401 */
 690          .callback = video_detect_force_native,
 691          /* Sony Vaio VPCEH3U1E */
 692          .matches = {
 693                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 694                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
 695                 },
 696         },
 697         {
 698          .callback = video_detect_force_native,
 699          /* Sony Vaio VPCY11S1E */
 700          .matches = {
 701                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 702                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCY11S1E"),
 703                 },
 704         },
 705
 706         /*
 707          * These Toshibas have a broken acpi-video interface for brightness
 708          * control. They also have an issue where the panel is off after
 709          * suspend until a special firmware call is made to turn it back
 710          * on. This is handled by the toshiba_acpi kernel module, so that
 711          * module must be enabled for these models to work correctly.
 712          */
 713         {
 714          /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
 715          .callback = video_detect_force_native,
 716          /* Toshiba Portégé R700 */
 717          .matches = {
 718                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 719                 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
 720                 },
 721         },
 722         {
 723          /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
 724          /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
 725          .callback = video_detect_force_native,
 726          /* Toshiba Satellite/Portégé R830 */
 727          .matches = {
 728                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 729                 DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
 730                 },
 731         },
 732         {
 733          .callback = video_detect_force_native,
 734          /* Toshiba Satellite/Portégé Z830 */
 735          .matches = {
 736                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 737                 DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
 738                 },
 739         },
 740
 741         /*
 742          * Models which have nvidia-ec-wmi support, but should not use it.
 743          * Note this indicates a likely firmware bug on these models and should
 744          * be revisited if/when Linux gets support for dynamic mux mode.
 745          */
 746         {
 747          .callback = video_detect_force_native,
 748          /* Dell G15 5515 */
 749          .matches = {
 750                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 751                 DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
 752                 },
 753         },
 754         {
 755          .callback = video_detect_force_native,
 756          .matches = {
 757                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 758                 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 15 3535"),
 759                 },
 760         },
 761
 762         /*
 763          * Desktops which falsely report a backlight and which our heuristics
 764          * for this do not catch.
 765          */
 766         {
 767          .callback = video_detect_force_none,
 768          /* Dell OptiPlex 9020M */
 769          .matches = {
 770                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 771                 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
 772                 },
 773         },
 774         {
 775          .callback = video_detect_force_none,
 776          /* GIGABYTE GB-BXBT-2807 */
 777          .matches = {
 778                 DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
 779                 DMI_MATCH(DMI_PRODUCT_NAME, "GB-BXBT-2807"),
 780                 },
 781         },
 782         {
 783          .callback = video_detect_force_none,
 784          /* MSI MS-7721 */
 785          .matches = {
 786                 DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 787                 DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"),
 788                 },
 789         },
 790         { },
 791 };
 792
 793 static bool google_cros_ec_present(void)
 794 {
 795         return acpi_dev_found("GOOG0004") || acpi_dev_found("GOOG000C");
 796 }
 797
 798 /*
 799  * Windows 8 and newer no longer use the ACPI video interface, so it often
 800  * does not work. So on win8+ systems prefer native brightness control.
 801  * Chromebooks should always prefer native backlight control.
 802  */
 803 static bool prefer_native_over_acpi_video(void)
 804 {
 805         return acpi_osi_is_win8() || google_cros_ec_present();
 806 }
 807
 808 /*
 809  * Determine which type of backlight interface to use on this system,
 810  * First check cmdline, then dmi quirks, then do autodetect.
 811  */
 812 enum acpi_backlight_type __acpi_video_get_backlight_type(bool native, bool *auto_detect)
 813 {
 814         static DEFINE_MUTEX(init_mutex);
 815         static bool nvidia_wmi_ec_present;
 816         static bool apple_gmux_present;
 817         static bool native_available;
 818         static bool init_done;
 819         static long video_caps;
 820
 821         /* Parse cmdline, dmi and acpi only once */
 822         mutex_lock(&init_mutex);
 823         if (!init_done) {
 824                 acpi_video_parse_cmdline();
 825                 dmi_check_system(video_detect_dmi_table);
 826                 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 827                                     ACPI_UINT32_MAX, find_video, NULL,
 828                                     &video_caps, NULL);
 829                 nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
 830                 apple_gmux_present = apple_gmux_detect(NULL, NULL);
 831                 init_done = true;
 832         }
 833         if (native)
 834                 native_available = true;
 835         mutex_unlock(&init_mutex);
 836
 837         if (auto_detect)
 838                 *auto_detect = false;
 839
 840         /*
 841          * The below heuristics / detection steps are in order of descending
 842          * presedence. The commandline takes presedence over anything else.
 843          */
 844         if (acpi_backlight_cmdline != acpi_backlight_undef)
 845                 return acpi_backlight_cmdline;
 846
 847         /* DMI quirks override any autodetection. */
 848         if (acpi_backlight_dmi != acpi_backlight_undef)
 849                 return acpi_backlight_dmi;
 850
 851         if (auto_detect)
 852                 *auto_detect = true;
 853
 854         /* Special cases such as nvidia_wmi_ec and apple gmux. */
 855         if (nvidia_wmi_ec_present)
 856                 return acpi_backlight_nvidia_wmi_ec;
 857
 858         if (apple_gmux_present)
 859                 return acpi_backlight_apple_gmux;
 860
 861         /* Use ACPI video if available, except when native should be preferred. */
 862         if ((video_caps & ACPI_VIDEO_BACKLIGHT) &&
 863              !(native_available && prefer_native_over_acpi_video()))
 864                 return acpi_backlight_video;
 865
 866         /* Use native if available */
 867         if (native_available)
 868                 return acpi_backlight_native;
 869
 870         /* No ACPI video/native (old hw), use vendor specific fw methods. */
 871         return acpi_backlight_vendor;
 872 }
 873 EXPORT_SYMBOL(__acpi_video_get_backlight_type);