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          .ident = "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         .ident = "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         .ident = "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         .ident = "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         .ident = "Sony VPCEH3U1E",
 151         .matches = {
 152                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 153                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
 154                 },
 155         },
 156
 157         /*
 158          * These models have a working acpi_video backlight control, and using
 159          * native backlight causes a regression where backlight does not work
 160          * when userspace is not handling brightness key events. Disable
 161          * native_backlight on these to fix this:
 162          * https://bugzilla.kernel.org/show_bug.cgi?id=81691
 163          */
 164         {
 165          .callback = video_detect_force_video,
 166          .ident = "ThinkPad T420",
 167          .matches = {
 168                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 169                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
 170                 },
 171         },
 172         {
 173          .callback = video_detect_force_video,
 174          .ident = "ThinkPad T520",
 175          .matches = {
 176                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 177                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
 178                 },
 179         },
 180         {
 181          .callback = video_detect_force_video,
 182          .ident = "ThinkPad X201s",
 183          .matches = {
 184                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 185                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
 186                 },
 187         },
 188         {
 189          .callback = video_detect_force_video,
 190          .ident = "ThinkPad X201T",
 191          .matches = {
 192                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 193                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
 194                 },
 195         },
 196
 197         /* The native backlight controls do not work on some older machines */
 198         {
 199          /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
 200          .callback = video_detect_force_video,
 201          .ident = "HP ENVY 15 Notebook",
 202          .matches = {
 203                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 204                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
 205                 },
 206         },
 207         {
 208          .callback = video_detect_force_video,
 209          .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E",
 210          .matches = {
 211                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 212                 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
 213                 },
 214         },
 215         {
 216          .callback = video_detect_force_video,
 217          .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V",
 218          .matches = {
 219                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 220                 DMI_MATCH(DMI_PRODUCT_NAME,
 221                           "370R4E/370R4V/370R5E/3570RE/370R5V"),
 222                 },
 223         },
 224         {
 225          /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
 226          .callback = video_detect_force_video,
 227          .ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV",
 228          .matches = {
 229                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 230                 DMI_MATCH(DMI_PRODUCT_NAME,
 231                           "3570R/370R/470R/450R/510R/4450RV"),
 232                 },
 233         },
 234         {
 235          /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
 236          .callback = video_detect_force_video,
 237          .ident = "SAMSUNG 670Z5E",
 238          .matches = {
 239                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 240                 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
 241                 },
 242         },
 243         {
 244          /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
 245          .callback = video_detect_force_video,
 246          .ident = "SAMSUNG 730U3E/740U3E",
 247          .matches = {
 248                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 249                 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
 250                 },
 251         },
 252         {
 253          /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
 254          .callback = video_detect_force_video,
 255          .ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D",
 256          .matches = {
 257                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 258                 DMI_MATCH(DMI_PRODUCT_NAME,
 259                           "900X3C/900X3D/900X3E/900X4C/900X4D"),
 260                 },
 261         },
 262         {
 263          /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
 264          .callback = video_detect_force_video,
 265          .ident = "Dell XPS14 L421X",
 266          .matches = {
 267                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 268                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
 269                 },
 270         },
 271         {
 272          /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
 273          .callback = video_detect_force_video,
 274          .ident = "Dell XPS15 L521X",
 275          .matches = {
 276                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 277                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
 278                 },
 279         },
 280         {
 281          /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
 282          .callback = video_detect_force_video,
 283          .ident = "SAMSUNG 530U4E/540U4E",
 284          .matches = {
 285                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 286                 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
 287                 },
 288         },
 289         /* https://bugs.launchpad.net/bugs/1894667 */
 290         {
 291          .callback = video_detect_force_video,
 292          .ident = "HP 635 Notebook",
 293          .matches = {
 294                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 295                 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
 296                 },
 297         },
 298
 299         /* Non win8 machines which need native backlight nevertheless */
 300         {
 301          /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
 302          .callback = video_detect_force_native,
 303          .ident = "Lenovo Ideapad S405",
 304          .matches = {
 305                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 306                 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
 307                 },
 308         },
 309         {
 310          /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
 311          .callback = video_detect_force_native,
 312          .ident = "Lenovo Ideapad Z570",
 313          .matches = {
 314                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 315                 DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
 316                 },
 317         },
 318         {
 319          .callback = video_detect_force_native,
 320          .ident = "Lenovo E41-25",
 321          .matches = {
 322                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 323                 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
 324                 },
 325         },
 326         {
 327          .callback = video_detect_force_native,
 328          .ident = "Lenovo E41-45",
 329          .matches = {
 330                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 331                 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
 332                 },
 333         },
 334         {
 335          /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
 336          .callback = video_detect_force_native,
 337          .ident = "Apple MacBook Pro 12,1",
 338          .matches = {
 339                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 340                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
 341                 },
 342         },
 343         {
 344          .callback = video_detect_force_native,
 345          .ident = "Dell Vostro V131",
 346          .matches = {
 347                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 348                 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 349                 },
 350         },
 351         {
 352          /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
 353          .callback = video_detect_force_native,
 354          .ident = "Dell XPS 17 L702X",
 355          .matches = {
 356                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 357                 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
 358                 },
 359         },
 360         {
 361          .callback = video_detect_force_native,
 362          .ident = "Dell Precision 7510",
 363          .matches = {
 364                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 365                 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
 366                 },
 367         },
 368         {
 369          .callback = video_detect_force_native,
 370          .ident = "Acer Aspire 5738z",
 371          .matches = {
 372                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 373                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
 374                 DMI_MATCH(DMI_BOARD_NAME, "JV50"),
 375                 },
 376         },
 377         {
 378          /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
 379          .callback = video_detect_force_native,
 380          .ident = "Acer TravelMate 5735Z",
 381          .matches = {
 382                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 383                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
 384                 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
 385                 },
 386         },
 387
 388         /*
 389          * Desktops which falsely report a backlight and which our heuristics
 390          * for this do not catch.
 391          */
 392         {
 393          .callback = video_detect_force_none,
 394          .ident = "Dell OptiPlex 9020M",
 395          .matches = {
 396                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 397                 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
 398                 },
 399         },
 400         {
 401          .callback = video_detect_force_none,
 402          .ident = "MSI MS-7721",
 403          .matches = {
 404                 DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 405                 DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"),
 406                 },
 407         },
 408         { },
 409 };
 410
 411 /* This uses a workqueue to avoid various locking ordering issues */
 412 static void acpi_video_backlight_notify_work(struct work_struct *work)
 413 {
 414         if (acpi_video_get_backlight_type() != acpi_backlight_video)
 415                 acpi_video_unregister_backlight();
 416 }
 417
 418 static int acpi_video_backlight_notify(struct notifier_block *nb,
 419                                        unsigned long val, void *bd)
 420 {
 421         struct backlight_device *backlight = bd;
 422
 423         /* A raw bl registering may change video -> native */
 424         if (backlight->props.type == BACKLIGHT_RAW &&
 425             val == BACKLIGHT_REGISTERED)
 426                 schedule_work(&backlight_notify_work);
 427
 428         return NOTIFY_OK;
 429 }
 430
 431 /*
 432  * Determine which type of backlight interface to use on this system,
 433  * First check cmdline, then dmi quirks, then do autodetect.
 434  *
 435  * The autodetect order is:
 436  * 1) Is the acpi-video backlight interface supported ->
 437  *  no, use a vendor interface
 438  * 2) Is this a win8 "ready" BIOS and do we have a native interface ->
 439  *  yes, use a native interface
 440  * 3) Else use the acpi-video interface
 441  *
 442  * Arguably the native on win8 check should be done first, but that would
 443  * be a behavior change, which may causes issues.
 444  */
 445 enum acpi_backlight_type acpi_video_get_backlight_type(void)
 446 {
 447         static DEFINE_MUTEX(init_mutex);
 448         static bool init_done;
 449         static long video_caps;
 450
 451         /* Parse cmdline, dmi and acpi only once */
 452         mutex_lock(&init_mutex);
 453         if (!init_done) {
 454                 acpi_video_parse_cmdline();
 455                 dmi_check_system(video_detect_dmi_table);
 456                 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 457                                     ACPI_UINT32_MAX, find_video, NULL,
 458                                     &video_caps, NULL);
 459                 INIT_WORK(&backlight_notify_work,
 460                           acpi_video_backlight_notify_work);
 461                 backlight_nb.notifier_call = acpi_video_backlight_notify;
 462                 backlight_nb.priority = 0;
 463                 if (backlight_register_notifier(&backlight_nb) == 0)
 464                         backlight_notifier_registered = true;
 465                 init_done = true;
 466         }
 467         mutex_unlock(&init_mutex);
 468
 469         if (acpi_backlight_cmdline != acpi_backlight_undef)
 470                 return acpi_backlight_cmdline;
 471
 472         if (acpi_backlight_dmi != acpi_backlight_undef)
 473                 return acpi_backlight_dmi;
 474
 475         if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
 476                 return acpi_backlight_vendor;
 477
 478         if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW))
 479                 return acpi_backlight_native;
 480
 481         return acpi_backlight_video;
 482 }
 483 EXPORT_SYMBOL(acpi_video_get_backlight_type);
 484
 485 /*
 486  * Set the preferred backlight interface type based on DMI info.
 487  * This function allows DMI blacklists to be implemented by external
 488  * platform drivers instead of putting a big blacklist in video_detect.c
 489  */
 490 void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
 491 {
 492         acpi_backlight_dmi = type;
 493         /* Remove acpi-video backlight interface if it is no longer desired */
 494         if (acpi_video_get_backlight_type() != acpi_backlight_video)
 495                 acpi_video_unregister_backlight();
 496 }
 497 EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);
 498
 499 void __exit acpi_video_detect_exit(void)
 500 {
 501         if (backlight_notifier_registered)
 502                 backlight_unregister_notifier(&backlight_nb);
 503 }