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
  21  * which driver should handle the backlight.
  22  *
  23  * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
  24  * this file will not be compiled and acpi_video_get_backlight_type() will
  25  * always return acpi_backlight_vendor.
  26  */
  27
  28 #include <linux/export.h>
  29 #include <linux/acpi.h>
  30 #include <linux/backlight.h>
  31 #include <linux/dmi.h>
  32 #include <linux/module.h>
  33 #include <linux/pci.h>
  34 #include <linux/types.h>
  35 #include <linux/workqueue.h>
  36 #include <acpi/video.h>
  37
  38 void acpi_video_unregister_backlight(void);
  39
  40 static bool backlight_notifier_registered;
  41 static struct notifier_block backlight_nb;
  42 static struct work_struct backlight_notify_work;
  43
  44 static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
  45 static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
  46
  47 static void acpi_video_parse_cmdline(void)
  48 {
  49         if (!strcmp("vendor", acpi_video_backlight_string))
  50                 acpi_backlight_cmdline = acpi_backlight_vendor;
  51         if (!strcmp("video", acpi_video_backlight_string))
  52                 acpi_backlight_cmdline = acpi_backlight_video;
  53         if (!strcmp("native", acpi_video_backlight_string))
  54                 acpi_backlight_cmdline = acpi_backlight_native;
  55         if (!strcmp("none", acpi_video_backlight_string))
  56                 acpi_backlight_cmdline = acpi_backlight_none;
  57 }
  58
  59 static acpi_status
  60 find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
  61 {
  62         long *cap = context;
  63         struct pci_dev *dev;
  64         struct acpi_device *acpi_dev;
  65
  66         static const struct acpi_device_id video_ids[] = {
  67                 {ACPI_VIDEO_HID, 0},
  68                 {"", 0},
  69         };
  70         if (acpi_bus_get_device(handle, &acpi_dev))
  71                 return AE_OK;
  72
  73         if (!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 /* Force to use vendor driver when the ACPI device is known to be
  84  * buggy */
  85 static int video_detect_force_vendor(const struct dmi_system_id *d)
  86 {
  87         acpi_backlight_dmi = acpi_backlight_vendor;
  88         return 0;
  89 }
  90
  91 static int video_detect_force_video(const struct dmi_system_id *d)
  92 {
  93         acpi_backlight_dmi = acpi_backlight_video;
  94         return 0;
  95 }
  96
  97 static int video_detect_force_native(const struct dmi_system_id *d)
  98 {
  99         acpi_backlight_dmi = acpi_backlight_native;
 100         return 0;
 101 }
 102
 103 static int video_detect_force_none(const struct dmi_system_id *d)
 104 {
 105         acpi_backlight_dmi = acpi_backlight_none;
 106         return 0;
 107 }
 108
 109 static const struct dmi_system_id video_detect_dmi_table[] = {
 110         /* On Samsung X360, the BIOS will set a flag (VDRV) if generic
 111          * ACPI backlight device is used. This flag will definitively break
 112          * the backlight interface (even the vendor interface) until next
 113          * reboot. It's why we should prevent video.ko from being used here
 114          * and we can't rely on a later call to acpi_video_unregister().
 115          */
 116         {
 117          .callback = video_detect_force_vendor,
 118          /* X360 */
 119          .matches = {
 120                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 121                 DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
 122                 DMI_MATCH(DMI_BOARD_NAME, "X360"),
 123                 },
 124         },
 125         {
 126         .callback = video_detect_force_vendor,
 127         /* Asus UL30VT */
 128         .matches = {
 129                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 130                 DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
 131                 },
 132         },
 133         {
 134         .callback = video_detect_force_vendor,
 135         /* Asus UL30A */
 136         .matches = {
 137                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 138                 DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
 139                 },
 140         },
 141         {
 142         .callback = video_detect_force_vendor,
 143         /* GIGABYTE GB-BXBT-2807 */
 144         .matches = {
 145                 DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
 146                 DMI_MATCH(DMI_PRODUCT_NAME, "GB-BXBT-2807"),
 147                 },
 148         },
 149         {
 150         .callback = video_detect_force_vendor,
 151         /* Sony VPCEH3U1E */
 152         .matches = {
 153                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 154                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
 155                 },
 156         },
 157         {
 158         .callback = video_detect_force_vendor,
 159         /* Xiaomi Mi Pad 2 */
 160         .matches = {
 161                         DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
 162                         DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
 163                 },
 164         },
 165
 166         /*
 167          * These models have a working acpi_video backlight control, and using
 168          * native backlight causes a regression where backlight does not work
 169          * when userspace is not handling brightness key events. Disable
 170          * native_backlight on these to fix this:
 171          * https://bugzilla.kernel.org/show_bug.cgi?id=81691
 172          */
 173         {
 174          .callback = video_detect_force_video,
 175          /* ThinkPad T420 */
 176          .matches = {
 177                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 178                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
 179                 },
 180         },
 181         {
 182          .callback = video_detect_force_video,
 183          /* ThinkPad T520 */
 184          .matches = {
 185                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 186                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
 187                 },
 188         },
 189         {
 190          .callback = video_detect_force_video,
 191          /* ThinkPad X201s */
 192          .matches = {
 193                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 194                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
 195                 },
 196         },
 197         {
 198          .callback = video_detect_force_video,
 199          /* ThinkPad X201T */
 200          .matches = {
 201                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 202                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
 203                 },
 204         },
 205
 206         /* The native backlight controls do not work on some older machines */
 207         {
 208          /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
 209          .callback = video_detect_force_video,
 210          /* HP ENVY 15 Notebook */
 211          .matches = {
 212                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 213                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
 214                 },
 215         },
 216         {
 217          .callback = video_detect_force_video,
 218          /* SAMSUNG 870Z5E/880Z5E/680Z5E */
 219          .matches = {
 220                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 221                 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
 222                 },
 223         },
 224         {
 225          .callback = video_detect_force_video,
 226          /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
 227          .matches = {
 228                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 229                 DMI_MATCH(DMI_PRODUCT_NAME,
 230                           "370R4E/370R4V/370R5E/3570RE/370R5V"),
 231                 },
 232         },
 233         {
 234          /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
 235          .callback = video_detect_force_video,
 236          /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
 237          .matches = {
 238                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 239                 DMI_MATCH(DMI_PRODUCT_NAME,
 240                           "3570R/370R/470R/450R/510R/4450RV"),
 241                 },
 242         },
 243         {
 244          /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
 245          .callback = video_detect_force_video,
 246          /* SAMSUNG 670Z5E */
 247          .matches = {
 248                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 249                 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
 250                 },
 251         },
 252         {
 253          /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
 254          .callback = video_detect_force_video,
 255          /* SAMSUNG 730U3E/740U3E */
 256          .matches = {
 257                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 258                 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
 259                 },
 260         },
 261         {
 262          /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
 263          .callback = video_detect_force_video,
 264          /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
 265          .matches = {
 266                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 267                 DMI_MATCH(DMI_PRODUCT_NAME,
 268                           "900X3C/900X3D/900X3E/900X4C/900X4D"),
 269                 },
 270         },
 271         {
 272          /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
 273          .callback = video_detect_force_video,
 274          /* Dell XPS14 L421X */
 275          .matches = {
 276                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 277                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
 278                 },
 279         },
 280         {
 281          /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
 282          .callback = video_detect_force_video,
 283          /* Dell XPS15 L521X */
 284          .matches = {
 285                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 286                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
 287                 },
 288         },
 289         {
 290          /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
 291          .callback = video_detect_force_video,
 292          /* SAMSUNG 530U4E/540U4E */
 293          .matches = {
 294                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 295                 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
 296                 },
 297         },
 298         /* https://bugs.launchpad.net/bugs/1894667 */
 299         {
 300          .callback = video_detect_force_video,
 301          /* HP 635 Notebook */
 302          .matches = {
 303                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 304                 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
 305                 },
 306         },
 307
 308         /* Non win8 machines which need native backlight nevertheless */
 309         {
 310          /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
 311          .callback = video_detect_force_native,
 312          /* Lenovo Ideapad S405 */
 313          .matches = {
 314                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 315                 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
 316                 },
 317         },
 318         {
 319          /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
 320          .callback = video_detect_force_native,
 321          /* Lenovo Ideapad Z570 */
 322          .matches = {
 323                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 324                 DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
 325                 },
 326         },
 327         {
 328          .callback = video_detect_force_native,
 329          /* Lenovo E41-25 */
 330          .matches = {
 331                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 332                 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
 333                 },
 334         },
 335         {
 336          .callback = video_detect_force_native,
 337          /* Lenovo E41-45 */
 338          .matches = {
 339                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 340                 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
 341                 },
 342         },
 343         {
 344          /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
 345          .callback = video_detect_force_native,
 346          /* Apple MacBook Pro 12,1 */
 347          .matches = {
 348                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 349                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
 350                 },
 351         },
 352         {
 353          .callback = video_detect_force_native,
 354          /* Dell Vostro V131 */
 355          .matches = {
 356                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 357                 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 358                 },
 359         },
 360         {
 361          /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
 362          .callback = video_detect_force_native,
 363          /* Dell XPS 17 L702X */
 364          .matches = {
 365                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 366                 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
 367                 },
 368         },
 369         {
 370          .callback = video_detect_force_native,
 371          /* Dell Precision 7510 */
 372          .matches = {
 373                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 374                 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
 375                 },
 376         },
 377         {
 378          .callback = video_detect_force_native,
 379          /* Acer Aspire 5738z */
 380          .matches = {
 381                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 382                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
 383                 DMI_MATCH(DMI_BOARD_NAME, "JV50"),
 384                 },
 385         },
 386         {
 387          /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
 388          .callback = video_detect_force_native,
 389          /* Acer TravelMate 5735Z */
 390          .matches = {
 391                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 392                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
 393                 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
 394                 },
 395         },
 396         {
 397         .callback = video_detect_force_native,
 398         /* ASUSTeK COMPUTER INC. GA401 */
 399         .matches = {
 400                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 401                 DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
 402                 },
 403         },
 404         {
 405         .callback = video_detect_force_native,
 406         /* ASUSTeK COMPUTER INC. GA502 */
 407         .matches = {
 408                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 409                 DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
 410                 },
 411         },
 412         {
 413         .callback = video_detect_force_native,
 414         /* ASUSTeK COMPUTER INC. GA503 */
 415         .matches = {
 416                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 417                 DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
 418                 },
 419         },
 420
 421         /*
 422          * Desktops which falsely report a backlight and which our heuristics
 423          * for this do not catch.
 424          */
 425         {
 426          .callback = video_detect_force_none,
 427          /* Dell OptiPlex 9020M */
 428          .matches = {
 429                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 430                 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
 431                 },
 432         },
 433         {
 434          .callback = video_detect_force_none,
 435          /* MSI MS-7721 */
 436          .matches = {
 437                 DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 438                 DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"),
 439                 },
 440         },
 441         { },
 442 };
 443
 444 /* This uses a workqueue to avoid various locking ordering issues */
 445 static void acpi_video_backlight_notify_work(struct work_struct *work)
 446 {
 447         if (acpi_video_get_backlight_type() != acpi_backlight_video)
 448                 acpi_video_unregister_backlight();
 449 }
 450
 451 static int acpi_video_backlight_notify(struct notifier_block *nb,
 452                                        unsigned long val, void *bd)
 453 {
 454         struct backlight_device *backlight = bd;
 455
 456         /* A raw bl registering may change video -> native */
 457         if (backlight->props.type == BACKLIGHT_RAW &&
 458             val == BACKLIGHT_REGISTERED)
 459                 schedule_work(&backlight_notify_work);
 460
 461         return NOTIFY_OK;
 462 }
 463
 464 /*
 465  * Determine which type of backlight interface to use on this system,
 466  * First check cmdline, then dmi quirks, then do autodetect.
 467  *
 468  * The autodetect order is:
 469  * 1) Is the acpi-video backlight interface supported ->
 470  *  no, use a vendor interface
 471  * 2) Is this a win8 "ready" BIOS and do we have a native interface ->
 472  *  yes, use a native interface
 473  * 3) Else use the acpi-video interface
 474  *
 475  * Arguably the native on win8 check should be done first, but that would
 476  * be a behavior change, which may causes issues.
 477  */
 478 enum acpi_backlight_type acpi_video_get_backlight_type(void)
 479 {
 480         static DEFINE_MUTEX(init_mutex);
 481         static bool init_done;
 482         static long video_caps;
 483
 484         /* Parse cmdline, dmi and acpi only once */
 485         mutex_lock(&init_mutex);
 486         if (!init_done) {
 487                 acpi_video_parse_cmdline();
 488                 dmi_check_system(video_detect_dmi_table);
 489                 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 490                                     ACPI_UINT32_MAX, find_video, NULL,
 491                                     &video_caps, NULL);
 492                 INIT_WORK(&backlight_notify_work,
 493                           acpi_video_backlight_notify_work);
 494                 backlight_nb.notifier_call = acpi_video_backlight_notify;
 495                 backlight_nb.priority = 0;
 496                 if (backlight_register_notifier(&backlight_nb) == 0)
 497                         backlight_notifier_registered = true;
 498                 init_done = true;
 499         }
 500         mutex_unlock(&init_mutex);
 501
 502         if (acpi_backlight_cmdline != acpi_backlight_undef)
 503                 return acpi_backlight_cmdline;
 504
 505         if (acpi_backlight_dmi != acpi_backlight_undef)
 506                 return acpi_backlight_dmi;
 507
 508         if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
 509                 return acpi_backlight_vendor;
 510
 511         if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW))
 512                 return acpi_backlight_native;
 513
 514         return acpi_backlight_video;
 515 }
 516 EXPORT_SYMBOL(acpi_video_get_backlight_type);
 517
 518 /*
 519  * Set the preferred backlight interface type based on DMI info.
 520  * This function allows DMI blacklists to be implemented by external
 521  * platform drivers instead of putting a big blacklist in video_detect.c
 522  */
 523 void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
 524 {
 525         acpi_backlight_dmi = type;
 526         /* Remove acpi-video backlight interface if it is no longer desired */
 527         if (acpi_video_get_backlight_type() != acpi_backlight_video)
 528                 acpi_video_unregister_backlight();
 529 }
 530 EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);
 531
 532 void __exit acpi_video_detect_exit(void)
 533 {
 534         if (backlight_notifier_registered)
 535                 backlight_unregister_notifier(&backlight_nb);
 536 }