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 const struct dmi_system_id video_detect_dmi_table[] = {
 134         /*
 135          * Models which should use the vendor backlight interface,
 136          * because of broken ACPI video backlight control.
 137          */
 138         {
 139          /* https://bugzilla.redhat.com/show_bug.cgi?id=1128309 */
 140          .callback = video_detect_force_vendor,
 141          /* Acer KAV80 */
 142          .matches = {
 143                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 144                 DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
 145                 },
 146         },
 147         {
 148          .callback = video_detect_force_vendor,
 149          /* Asus UL30VT */
 150          .matches = {
 151                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 152                 DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
 153                 },
 154         },
 155         {
 156          .callback = video_detect_force_vendor,
 157          /* Asus UL30A */
 158          .matches = {
 159                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 160                 DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
 161                 },
 162         },
 163         {
 164          .callback = video_detect_force_vendor,
 165          /* Asus X55U */
 166          .matches = {
 167                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 168                 DMI_MATCH(DMI_PRODUCT_NAME, "X55U"),
 169                 },
 170         },
 171         {
 172          /* https://bugs.launchpad.net/bugs/1000146 */
 173          .callback = video_detect_force_vendor,
 174          /* Asus X101CH */
 175          .matches = {
 176                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 177                 DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
 178                 },
 179         },
 180         {
 181          .callback = video_detect_force_vendor,
 182          /* Asus X401U */
 183          .matches = {
 184                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 185                 DMI_MATCH(DMI_PRODUCT_NAME, "X401U"),
 186                 },
 187         },
 188         {
 189          .callback = video_detect_force_vendor,
 190          /* Asus X501U */
 191          .matches = {
 192                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 193                 DMI_MATCH(DMI_PRODUCT_NAME, "X501U"),
 194                 },
 195         },
 196         {
 197          /* https://bugs.launchpad.net/bugs/1000146 */
 198          .callback = video_detect_force_vendor,
 199          /* Asus 1015CX */
 200          .matches = {
 201                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 202                 DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
 203                 },
 204         },
 205         {
 206          .callback = video_detect_force_vendor,
 207          /* Samsung N150/N210/N220 */
 208          .matches = {
 209                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 210                 DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
 211                 DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
 212                 },
 213         },
 214         {
 215          .callback = video_detect_force_vendor,
 216          /* Samsung NF110/NF210/NF310 */
 217          .matches = {
 218                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 219                 DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
 220                 DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
 221                 },
 222         },
 223         {
 224          .callback = video_detect_force_vendor,
 225          /* Samsung NC210 */
 226          .matches = {
 227                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 228                 DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
 229                 DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
 230                 },
 231         },
 232         {
 233          .callback = video_detect_force_vendor,
 234          /* Xiaomi Mi Pad 2 */
 235          .matches = {
 236                         DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
 237                         DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
 238                 },
 239         },
 240
 241         /*
 242          * Models which should use the vendor backlight interface,
 243          * because of broken native backlight control.
 244          */
 245         {
 246          .callback = video_detect_force_vendor,
 247          /* Sony Vaio PCG-FRV35 */
 248          .matches = {
 249                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 250                 DMI_MATCH(DMI_PRODUCT_NAME, "PCG-FRV35"),
 251                 },
 252         },
 253
 254         /*
 255          * Toshiba models with Transflective display, these need to use
 256          * the toshiba_acpi vendor driver for proper Transflective handling.
 257          */
 258         {
 259          .callback = video_detect_force_vendor,
 260          .matches = {
 261                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 262                 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R500"),
 263                 },
 264         },
 265         {
 266          .callback = video_detect_force_vendor,
 267          .matches = {
 268                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 269                 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R600"),
 270                 },
 271         },
 272
 273         /*
 274          * Models which need acpi_video backlight control where the GPU drivers
 275          * do not call acpi_video_register_backlight() because no internal panel
 276          * is detected. Typically these are all-in-ones (monitors with builtin
 277          * PC) where the panel connection shows up as regular DP instead of eDP.
 278          */
 279         {
 280          .callback = video_detect_force_video,
 281          /* Apple iMac14,1 */
 282          .matches = {
 283                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 284                 DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,1"),
 285                 },
 286         },
 287         {
 288          .callback = video_detect_force_video,
 289          /* Apple iMac14,2 */
 290          .matches = {
 291                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 292                 DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,2"),
 293                 },
 294         },
 295
 296         /*
 297          * These models have a working acpi_video backlight control, and using
 298          * native backlight causes a regression where backlight does not work
 299          * when userspace is not handling brightness key events. Disable
 300          * native_backlight on these to fix this:
 301          * https://bugzilla.kernel.org/show_bug.cgi?id=81691
 302          */
 303         {
 304          .callback = video_detect_force_video,
 305          /* ThinkPad T420 */
 306          .matches = {
 307                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 308                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
 309                 },
 310         },
 311         {
 312          .callback = video_detect_force_video,
 313          /* ThinkPad T520 */
 314          .matches = {
 315                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 316                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
 317                 },
 318         },
 319         {
 320          .callback = video_detect_force_video,
 321          /* ThinkPad X201s */
 322          .matches = {
 323                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 324                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
 325                 },
 326         },
 327         {
 328          .callback = video_detect_force_video,
 329          /* ThinkPad X201T */
 330          .matches = {
 331                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 332                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
 333                 },
 334         },
 335
 336         /* The native backlight controls do not work on some older machines */
 337         {
 338          /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
 339          .callback = video_detect_force_video,
 340          /* HP ENVY 15 Notebook */
 341          .matches = {
 342                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 343                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
 344                 },
 345         },
 346         {
 347          .callback = video_detect_force_video,
 348          /* SAMSUNG 870Z5E/880Z5E/680Z5E */
 349          .matches = {
 350                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 351                 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
 352                 },
 353         },
 354         {
 355          .callback = video_detect_force_video,
 356          /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
 357          .matches = {
 358                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 359                 DMI_MATCH(DMI_PRODUCT_NAME,
 360                           "370R4E/370R4V/370R5E/3570RE/370R5V"),
 361                 },
 362         },
 363         {
 364          /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
 365          .callback = video_detect_force_video,
 366          /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
 367          .matches = {
 368                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 369                 DMI_MATCH(DMI_PRODUCT_NAME,
 370                           "3570R/370R/470R/450R/510R/4450RV"),
 371                 },
 372         },
 373         {
 374          /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
 375          .callback = video_detect_force_video,
 376          /* SAMSUNG 670Z5E */
 377          .matches = {
 378                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 379                 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
 380                 },
 381         },
 382         {
 383          /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
 384          .callback = video_detect_force_video,
 385          /* SAMSUNG 730U3E/740U3E */
 386          .matches = {
 387                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 388                 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
 389                 },
 390         },
 391         {
 392          /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
 393          .callback = video_detect_force_video,
 394          /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
 395          .matches = {
 396                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 397                 DMI_MATCH(DMI_PRODUCT_NAME,
 398                           "900X3C/900X3D/900X3E/900X4C/900X4D"),
 399                 },
 400         },
 401         {
 402          /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
 403          .callback = video_detect_force_video,
 404          /* Dell XPS14 L421X */
 405          .matches = {
 406                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 407                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
 408                 },
 409         },
 410         {
 411          /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
 412          .callback = video_detect_force_video,
 413          /* Dell XPS15 L521X */
 414          .matches = {
 415                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 416                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
 417                 },
 418         },
 419         {
 420          /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
 421          .callback = video_detect_force_video,
 422          /* SAMSUNG 530U4E/540U4E */
 423          .matches = {
 424                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 425                 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
 426                 },
 427         },
 428         {
 429          /* https://bugs.launchpad.net/bugs/1894667 */
 430          .callback = video_detect_force_video,
 431          /* HP 635 Notebook */
 432          .matches = {
 433                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 434                 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
 435                 },
 436         },
 437
 438         /* Non win8 machines which need native backlight nevertheless */
 439         {
 440          /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
 441          .callback = video_detect_force_native,
 442          /* Lenovo Ideapad S405 */
 443          .matches = {
 444                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 445                 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
 446                 },
 447         },
 448         {
 449          /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
 450          .callback = video_detect_force_native,
 451          /* Lenovo Ideapad Z570 */
 452          .matches = {
 453                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 454                 DMI_MATCH(DMI_PRODUCT_VERSION, "Ideapad Z570"),
 455                 },
 456         },
 457         {
 458          .callback = video_detect_force_native,
 459          /* Lenovo E41-25 */
 460          .matches = {
 461                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 462                 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
 463                 },
 464         },
 465         {
 466          .callback = video_detect_force_native,
 467          /* Lenovo E41-45 */
 468          .matches = {
 469                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 470                 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
 471                 },
 472         },
 473         {
 474          /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
 475          .callback = video_detect_force_native,
 476          /* Apple MacBook Pro 12,1 */
 477          .matches = {
 478                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 479                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
 480                 },
 481         },
 482         {
 483          .callback = video_detect_force_native,
 484          /* Dell Inspiron N4010 */
 485          .matches = {
 486                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 487                 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"),
 488                 },
 489         },
 490         {
 491          .callback = video_detect_force_native,
 492          /* Dell Vostro V131 */
 493          .matches = {
 494                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 495                 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 496                 },
 497         },
 498         {
 499          /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
 500          .callback = video_detect_force_native,
 501          /* Dell XPS 17 L702X */
 502          .matches = {
 503                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 504                 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
 505                 },
 506         },
 507         {
 508          .callback = video_detect_force_native,
 509          /* Dell Precision 7510 */
 510          .matches = {
 511                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 512                 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
 513                 },
 514         },
 515         {
 516          .callback = video_detect_force_native,
 517          /* Acer Aspire 3830TG */
 518          .matches = {
 519                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 520                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3830TG"),
 521                 },
 522         },
 523         {
 524          .callback = video_detect_force_native,
 525          /* Acer Aspire 4810T */
 526          .matches = {
 527                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 528                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 4810T"),
 529                 },
 530         },
 531         {
 532          .callback = video_detect_force_native,
 533          /* Acer Aspire 5738z */
 534          .matches = {
 535                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 536                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
 537                 DMI_MATCH(DMI_BOARD_NAME, "JV50"),
 538                 },
 539         },
 540         {
 541          /* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */
 542          .callback = video_detect_force_native,
 543          /* Acer Aspire 5741 */
 544          .matches = {
 545                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 546                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
 547                 },
 548         },
 549         {
 550          /* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */
 551          .callback = video_detect_force_native,
 552          /* Acer Aspire 5750 */
 553          .matches = {
 554                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 555                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
 556                 },
 557         },
 558         {
 559          /* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */
 560          .callback = video_detect_force_native,
 561          /* Acer Extensa 5235 */
 562          .matches = {
 563                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 564                 DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
 565                 },
 566         },
 567         {
 568          .callback = video_detect_force_native,
 569          /* Acer TravelMate 4750 */
 570          .matches = {
 571                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 572                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
 573                 },
 574         },
 575         {
 576          /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
 577          .callback = video_detect_force_native,
 578          /* Acer TravelMate 5735Z */
 579          .matches = {
 580                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 581                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
 582                 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
 583                 },
 584         },
 585         {
 586          /* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */
 587          .callback = video_detect_force_native,
 588          /* Acer TravelMate 5760 */
 589          .matches = {
 590                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 591                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
 592                 },
 593         },
 594         {
 595          .callback = video_detect_force_native,
 596          /* ASUSTeK COMPUTER INC. GA401 */
 597          .matches = {
 598                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 599                 DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
 600                 },
 601         },
 602         {
 603          .callback = video_detect_force_native,
 604          /* ASUSTeK COMPUTER INC. GA502 */
 605          .matches = {
 606                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 607                 DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
 608                 },
 609         },
 610         {
 611          .callback = video_detect_force_native,
 612          /* ASUSTeK COMPUTER INC. GA503 */
 613          .matches = {
 614                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 615                 DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
 616                 },
 617         },
 618         {
 619          .callback = video_detect_force_native,
 620          /* Asus U46E */
 621          .matches = {
 622                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 623                 DMI_MATCH(DMI_PRODUCT_NAME, "U46E"),
 624                 },
 625         },
 626         {
 627          .callback = video_detect_force_native,
 628          /* Asus UX303UB */
 629          .matches = {
 630                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 631                 DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
 632                 },
 633         },
 634         {
 635          .callback = video_detect_force_native,
 636          /* HP EliteBook 8460p */
 637          .matches = {
 638                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 639                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8460p"),
 640                 },
 641         },
 642         {
 643          .callback = video_detect_force_native,
 644          /* HP Pavilion g6-1d80nr / B4U19UA */
 645          .matches = {
 646                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 647                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
 648                 DMI_MATCH(DMI_PRODUCT_SKU, "B4U19UA"),
 649                 },
 650         },
 651         {
 652          .callback = video_detect_force_native,
 653          /* Samsung N150P */
 654          .matches = {
 655                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 656                 DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
 657                 DMI_MATCH(DMI_BOARD_NAME, "N150P"),
 658                 },
 659         },
 660         {
 661          .callback = video_detect_force_native,
 662          /* Samsung N145P/N250P/N260P */
 663          .matches = {
 664                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 665                 DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
 666                 DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
 667                 },
 668         },
 669         {
 670          .callback = video_detect_force_native,
 671          /* Samsung N250P */
 672          .matches = {
 673                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 674                 DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
 675                 DMI_MATCH(DMI_BOARD_NAME, "N250P"),
 676                 },
 677         },
 678         {
 679          /* https://bugzilla.kernel.org/show_bug.cgi?id=202401 */
 680          .callback = video_detect_force_native,
 681          /* Sony Vaio VPCEH3U1E */
 682          .matches = {
 683                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 684                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
 685                 },
 686         },
 687         {
 688          .callback = video_detect_force_native,
 689          /* Sony Vaio VPCY11S1E */
 690          .matches = {
 691                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 692                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCY11S1E"),
 693                 },
 694         },
 695
 696         /*
 697          * These Toshibas have a broken acpi-video interface for brightness
 698          * control. They also have an issue where the panel is off after
 699          * suspend until a special firmware call is made to turn it back
 700          * on. This is handled by the toshiba_acpi kernel module, so that
 701          * module must be enabled for these models to work correctly.
 702          */
 703         {
 704          /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
 705          .callback = video_detect_force_native,
 706          /* Toshiba Portégé R700 */
 707          .matches = {
 708                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 709                 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
 710                 },
 711         },
 712         {
 713          /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
 714          /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
 715          .callback = video_detect_force_native,
 716          /* Toshiba Satellite/Portégé R830 */
 717          .matches = {
 718                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 719                 DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
 720                 },
 721         },
 722         {
 723          .callback = video_detect_force_native,
 724          /* Toshiba Satellite/Portégé Z830 */
 725          .matches = {
 726                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 727                 DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
 728                 },
 729         },
 730
 731         /*
 732          * Models which have nvidia-ec-wmi support, but should not use it.
 733          * Note this indicates a likely firmware bug on these models and should
 734          * be revisited if/when Linux gets support for dynamic mux mode.
 735          */
 736         {
 737          .callback = video_detect_force_native,
 738          /* Dell G15 5515 */
 739          .matches = {
 740                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 741                 DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
 742                 },
 743         },
 744         {
 745          .callback = video_detect_force_native,
 746          .matches = {
 747                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 748                 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 15 3535"),
 749                 },
 750         },
 751         { },
 752 };
 753
 754 static bool google_cros_ec_present(void)
 755 {
 756         return acpi_dev_found("GOOG0004") || acpi_dev_found("GOOG000C");
 757 }
 758
 759 /*
 760  * Windows 8 and newer no longer use the ACPI video interface, so it often
 761  * does not work. So on win8+ systems prefer native brightness control.
 762  * Chromebooks should always prefer native backlight control.
 763  */
 764 static bool prefer_native_over_acpi_video(void)
 765 {
 766         return acpi_osi_is_win8() || google_cros_ec_present();
 767 }
 768
 769 /*
 770  * Determine which type of backlight interface to use on this system,
 771  * First check cmdline, then dmi quirks, then do autodetect.
 772  */
 773 enum acpi_backlight_type __acpi_video_get_backlight_type(bool native, bool *auto_detect)
 774 {
 775         static DEFINE_MUTEX(init_mutex);
 776         static bool nvidia_wmi_ec_present;
 777         static bool apple_gmux_present;
 778         static bool native_available;
 779         static bool init_done;
 780         static long video_caps;
 781
 782         /* Parse cmdline, dmi and acpi only once */
 783         mutex_lock(&init_mutex);
 784         if (!init_done) {
 785                 acpi_video_parse_cmdline();
 786                 dmi_check_system(video_detect_dmi_table);
 787                 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 788                                     ACPI_UINT32_MAX, find_video, NULL,
 789                                     &video_caps, NULL);
 790                 nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
 791                 apple_gmux_present = apple_gmux_detect(NULL, NULL);
 792                 init_done = true;
 793         }
 794         if (native)
 795                 native_available = true;
 796         mutex_unlock(&init_mutex);
 797
 798         if (auto_detect)
 799                 *auto_detect = false;
 800
 801         /*
 802          * The below heuristics / detection steps are in order of descending
 803          * presedence. The commandline takes presedence over anything else.
 804          */
 805         if (acpi_backlight_cmdline != acpi_backlight_undef)
 806                 return acpi_backlight_cmdline;
 807
 808         /* DMI quirks override any autodetection. */
 809         if (acpi_backlight_dmi != acpi_backlight_undef)
 810                 return acpi_backlight_dmi;
 811
 812         if (auto_detect)
 813                 *auto_detect = true;
 814
 815         /* Special cases such as nvidia_wmi_ec and apple gmux. */
 816         if (nvidia_wmi_ec_present)
 817                 return acpi_backlight_nvidia_wmi_ec;
 818
 819         if (apple_gmux_present)
 820                 return acpi_backlight_apple_gmux;
 821
 822         /* Use ACPI video if available, except when native should be preferred. */
 823         if ((video_caps & ACPI_VIDEO_BACKLIGHT) &&
 824              !(native_available && prefer_native_over_acpi_video()))
 825                 return acpi_backlight_video;
 826
 827         /* Use native if available */
 828         if (native_available)
 829                 return acpi_backlight_native;
 830
 831         /* No ACPI video/native (old hw), use vendor specific fw methods. */
 832         return acpi_backlight_vendor;
 833 }
 834 EXPORT_SYMBOL(__acpi_video_get_backlight_type);