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          * These models have a working acpi_video backlight control, and using
 279          * native backlight causes a regression where backlight does not work
 280          * when userspace is not handling brightness key events. Disable
 281          * native_backlight on these to fix this:
 282          * https://bugzilla.kernel.org/show_bug.cgi?id=81691
 283          */
 284         {
 285          .callback = video_detect_force_video,
 286          /* ThinkPad T420 */
 287          .matches = {
 288                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 289                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
 290                 },
 291         },
 292         {
 293          .callback = video_detect_force_video,
 294          /* ThinkPad T520 */
 295          .matches = {
 296                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 297                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
 298                 },
 299         },
 300         {
 301          .callback = video_detect_force_video,
 302          /* ThinkPad X201s */
 303          .matches = {
 304                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 305                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
 306                 },
 307         },
 308         {
 309          .callback = video_detect_force_video,
 310          /* ThinkPad X201T */
 311          .matches = {
 312                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 313                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
 314                 },
 315         },
 316
 317         /* The native backlight controls do not work on some older machines */
 318         {
 319          /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
 320          .callback = video_detect_force_video,
 321          /* HP ENVY 15 Notebook */
 322          .matches = {
 323                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 324                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
 325                 },
 326         },
 327         {
 328          .callback = video_detect_force_video,
 329          /* SAMSUNG 870Z5E/880Z5E/680Z5E */
 330          .matches = {
 331                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 332                 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
 333                 },
 334         },
 335         {
 336          .callback = video_detect_force_video,
 337          /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
 338          .matches = {
 339                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 340                 DMI_MATCH(DMI_PRODUCT_NAME,
 341                           "370R4E/370R4V/370R5E/3570RE/370R5V"),
 342                 },
 343         },
 344         {
 345          /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
 346          .callback = video_detect_force_video,
 347          /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
 348          .matches = {
 349                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 350                 DMI_MATCH(DMI_PRODUCT_NAME,
 351                           "3570R/370R/470R/450R/510R/4450RV"),
 352                 },
 353         },
 354         {
 355          /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
 356          .callback = video_detect_force_video,
 357          /* SAMSUNG 670Z5E */
 358          .matches = {
 359                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 360                 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
 361                 },
 362         },
 363         {
 364          /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
 365          .callback = video_detect_force_video,
 366          /* SAMSUNG 730U3E/740U3E */
 367          .matches = {
 368                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 369                 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
 370                 },
 371         },
 372         {
 373          /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
 374          .callback = video_detect_force_video,
 375          /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
 376          .matches = {
 377                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 378                 DMI_MATCH(DMI_PRODUCT_NAME,
 379                           "900X3C/900X3D/900X3E/900X4C/900X4D"),
 380                 },
 381         },
 382         {
 383          /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
 384          .callback = video_detect_force_video,
 385          /* Dell XPS14 L421X */
 386          .matches = {
 387                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 388                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
 389                 },
 390         },
 391         {
 392          /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
 393          .callback = video_detect_force_video,
 394          /* Dell XPS15 L521X */
 395          .matches = {
 396                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 397                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
 398                 },
 399         },
 400         {
 401          /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
 402          .callback = video_detect_force_video,
 403          /* SAMSUNG 530U4E/540U4E */
 404          .matches = {
 405                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 406                 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
 407                 },
 408         },
 409         /* https://bugs.launchpad.net/bugs/1894667 */
 410         {
 411          .callback = video_detect_force_video,
 412          /* HP 635 Notebook */
 413          .matches = {
 414                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 415                 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
 416                 },
 417         },
 418
 419         /* Non win8 machines which need native backlight nevertheless */
 420         {
 421          /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
 422          .callback = video_detect_force_native,
 423          /* Lenovo Ideapad S405 */
 424          .matches = {
 425                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 426                 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
 427                 },
 428         },
 429         {
 430          /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
 431          .callback = video_detect_force_native,
 432          /* Lenovo Ideapad Z570 */
 433          .matches = {
 434                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 435                 DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
 436                 },
 437         },
 438         {
 439          .callback = video_detect_force_native,
 440          /* Lenovo E41-25 */
 441          .matches = {
 442                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 443                 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
 444                 },
 445         },
 446         {
 447          .callback = video_detect_force_native,
 448          /* Lenovo E41-45 */
 449          .matches = {
 450                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 451                 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
 452                 },
 453         },
 454         {
 455          /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
 456          .callback = video_detect_force_native,
 457          /* Apple MacBook Pro 12,1 */
 458          .matches = {
 459                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 460                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
 461                 },
 462         },
 463         {
 464          .callback = video_detect_force_native,
 465          /* Dell Inspiron N4010 */
 466          .matches = {
 467                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 468                 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"),
 469                 },
 470         },
 471         {
 472          .callback = video_detect_force_native,
 473          /* Dell Vostro V131 */
 474          .matches = {
 475                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 476                 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 477                 },
 478         },
 479         {
 480          /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
 481          .callback = video_detect_force_native,
 482          /* Dell XPS 17 L702X */
 483          .matches = {
 484                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 485                 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
 486                 },
 487         },
 488         {
 489          .callback = video_detect_force_native,
 490          /* Dell Precision 7510 */
 491          .matches = {
 492                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 493                 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
 494                 },
 495         },
 496         {
 497          .callback = video_detect_force_native,
 498          /* Acer Aspire 5738z */
 499          .matches = {
 500                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 501                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
 502                 DMI_MATCH(DMI_BOARD_NAME, "JV50"),
 503                 },
 504         },
 505         {
 506          /* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */
 507          .callback = video_detect_force_native,
 508          /* Acer Aspire 5741 */
 509          .matches = {
 510                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 511                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
 512                 },
 513         },
 514         {
 515          /* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */
 516          .callback = video_detect_force_native,
 517          /* Acer Aspire 5750 */
 518          .matches = {
 519                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 520                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
 521                 },
 522         },
 523         {
 524          /* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */
 525          .callback = video_detect_force_native,
 526          /* Acer Extensa 5235 */
 527          .matches = {
 528                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 529                 DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
 530                 },
 531         },
 532         {
 533          .callback = video_detect_force_native,
 534          /* Acer TravelMate 4750 */
 535          .matches = {
 536                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 537                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
 538                 },
 539         },
 540         {
 541          /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
 542          .callback = video_detect_force_native,
 543          /* Acer TravelMate 5735Z */
 544          .matches = {
 545                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 546                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
 547                 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
 548                 },
 549         },
 550         {
 551          /* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */
 552          .callback = video_detect_force_native,
 553          /* Acer TravelMate 5760 */
 554          .matches = {
 555                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 556                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
 557                 },
 558         },
 559         {
 560          .callback = video_detect_force_native,
 561          /* ASUSTeK COMPUTER INC. GA401 */
 562          .matches = {
 563                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 564                 DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
 565                 },
 566         },
 567         {
 568          .callback = video_detect_force_native,
 569          /* ASUSTeK COMPUTER INC. GA502 */
 570          .matches = {
 571                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 572                 DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
 573                 },
 574         },
 575         {
 576          .callback = video_detect_force_native,
 577          /* ASUSTeK COMPUTER INC. GA503 */
 578          .matches = {
 579                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 580                 DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
 581                 },
 582         },
 583         {
 584          .callback = video_detect_force_native,
 585          /* Asus U46E */
 586          .matches = {
 587                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 588                 DMI_MATCH(DMI_PRODUCT_NAME, "U46E"),
 589                 },
 590         },
 591         {
 592          .callback = video_detect_force_native,
 593          /* Asus UX303UB */
 594          .matches = {
 595                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 596                 DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
 597                 },
 598         },
 599         {
 600          .callback = video_detect_force_native,
 601          /* HP EliteBook 8460p */
 602          .matches = {
 603                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 604                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8460p"),
 605                 },
 606         },
 607         {
 608          .callback = video_detect_force_native,
 609          /* HP Pavilion g6-1d80nr / B4U19UA */
 610          .matches = {
 611                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 612                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
 613                 DMI_MATCH(DMI_PRODUCT_SKU, "B4U19UA"),
 614                 },
 615         },
 616         {
 617          .callback = video_detect_force_native,
 618          /* Samsung N150P */
 619          .matches = {
 620                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 621                 DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
 622                 DMI_MATCH(DMI_BOARD_NAME, "N150P"),
 623                 },
 624         },
 625         {
 626          .callback = video_detect_force_native,
 627          /* Samsung N145P/N250P/N260P */
 628          .matches = {
 629                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 630                 DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
 631                 DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
 632                 },
 633         },
 634         {
 635          .callback = video_detect_force_native,
 636          /* Samsung N250P */
 637          .matches = {
 638                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 639                 DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
 640                 DMI_MATCH(DMI_BOARD_NAME, "N250P"),
 641                 },
 642         },
 643         {
 644          /* https://bugzilla.kernel.org/show_bug.cgi?id=202401 */
 645          .callback = video_detect_force_native,
 646          /* Sony Vaio VPCEH3U1E */
 647          .matches = {
 648                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 649                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
 650                 },
 651         },
 652         {
 653          .callback = video_detect_force_native,
 654          /* Sony Vaio VPCY11S1E */
 655          .matches = {
 656                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 657                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCY11S1E"),
 658                 },
 659         },
 660
 661         /*
 662          * These Toshibas have a broken acpi-video interface for brightness
 663          * control. They also have an issue where the panel is off after
 664          * suspend until a special firmware call is made to turn it back
 665          * on. This is handled by the toshiba_acpi kernel module, so that
 666          * module must be enabled for these models to work correctly.
 667          */
 668         {
 669          /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
 670          .callback = video_detect_force_native,
 671          /* Toshiba Portégé R700 */
 672          .matches = {
 673                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 674                 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
 675                 },
 676         },
 677         {
 678          /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
 679          /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
 680          .callback = video_detect_force_native,
 681          /* Toshiba Satellite/Portégé R830 */
 682          .matches = {
 683                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 684                 DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
 685                 },
 686         },
 687         {
 688          .callback = video_detect_force_native,
 689          /* Toshiba Satellite/Portégé Z830 */
 690          .matches = {
 691                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 692                 DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
 693                 },
 694         },
 695
 696         /*
 697          * Models which have nvidia-ec-wmi support, but should not use it.
 698          * Note this indicates a likely firmware bug on these models and should
 699          * be revisited if/when Linux gets support for dynamic mux mode.
 700          */
 701         {
 702          .callback = video_detect_force_native,
 703          /* Dell G15 5515 */
 704          .matches = {
 705                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 706                 DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
 707                 },
 708         },
 709
 710         /*
 711          * Desktops which falsely report a backlight and which our heuristics
 712          * for this do not catch.
 713          */
 714         {
 715          .callback = video_detect_force_none,
 716          /* Dell OptiPlex 9020M */
 717          .matches = {
 718                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 719                 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
 720                 },
 721         },
 722         {
 723          .callback = video_detect_force_none,
 724          /* GIGABYTE GB-BXBT-2807 */
 725          .matches = {
 726                 DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
 727                 DMI_MATCH(DMI_PRODUCT_NAME, "GB-BXBT-2807"),
 728                 },
 729         },
 730         {
 731          .callback = video_detect_force_none,
 732          /* MSI MS-7721 */
 733          .matches = {
 734                 DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 735                 DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"),
 736                 },
 737         },
 738         { },
 739 };
 740
 741 static bool google_cros_ec_present(void)
 742 {
 743         return acpi_dev_found("GOOG0004") || acpi_dev_found("GOOG000C");
 744 }
 745
 746 /*
 747  * Windows 8 and newer no longer use the ACPI video interface, so it often
 748  * does not work. So on win8+ systems prefer native brightness control.
 749  * Chromebooks should always prefer native backlight control.
 750  */
 751 static bool prefer_native_over_acpi_video(void)
 752 {
 753         return acpi_osi_is_win8() || google_cros_ec_present();
 754 }
 755
 756 /*
 757  * Determine which type of backlight interface to use on this system,
 758  * First check cmdline, then dmi quirks, then do autodetect.
 759  */
 760 static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
 761 {
 762         static DEFINE_MUTEX(init_mutex);
 763         static bool nvidia_wmi_ec_present;
 764         static bool apple_gmux_present;
 765         static bool native_available;
 766         static bool init_done;
 767         static long video_caps;
 768
 769         /* Parse cmdline, dmi and acpi only once */
 770         mutex_lock(&init_mutex);
 771         if (!init_done) {
 772                 acpi_video_parse_cmdline();
 773                 dmi_check_system(video_detect_dmi_table);
 774                 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 775                                     ACPI_UINT32_MAX, find_video, NULL,
 776                                     &video_caps, NULL);
 777                 nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
 778                 apple_gmux_present = apple_gmux_detect(NULL, NULL);
 779                 init_done = true;
 780         }
 781         if (native)
 782                 native_available = true;
 783         mutex_unlock(&init_mutex);
 784
 785         /*
 786          * The below heuristics / detection steps are in order of descending
 787          * presedence. The commandline takes presedence over anything else.
 788          */
 789         if (acpi_backlight_cmdline != acpi_backlight_undef)
 790                 return acpi_backlight_cmdline;
 791
 792         /* DMI quirks override any autodetection. */
 793         if (acpi_backlight_dmi != acpi_backlight_undef)
 794                 return acpi_backlight_dmi;
 795
 796         /* Special cases such as nvidia_wmi_ec and apple gmux. */
 797         if (nvidia_wmi_ec_present)
 798                 return acpi_backlight_nvidia_wmi_ec;
 799
 800         if (apple_gmux_present)
 801                 return acpi_backlight_apple_gmux;
 802
 803         /* Use ACPI video if available, except when native should be preferred. */
 804         if ((video_caps & ACPI_VIDEO_BACKLIGHT) &&
 805              !(native_available && prefer_native_over_acpi_video()))
 806                 return acpi_backlight_video;
 807
 808         /* Use native if available */
 809         if (native_available)
 810                 return acpi_backlight_native;
 811
 812         /* No ACPI video/native (old hw), use vendor specific fw methods. */
 813         return acpi_backlight_vendor;
 814 }
 815
 816 enum acpi_backlight_type acpi_video_get_backlight_type(void)
 817 {
 818         return __acpi_video_get_backlight_type(false);
 819 }
 820 EXPORT_SYMBOL(acpi_video_get_backlight_type);
 821
 822 bool acpi_video_backlight_use_native(void)
 823 {
 824         return __acpi_video_get_backlight_type(true) == acpi_backlight_native;
 825 }
 826 EXPORT_SYMBOL(acpi_video_backlight_use_native);