drivers/acpi/video_detect.c

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