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 = "Sony VPCEH3U1E",
 144         .matches = {
 145                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 146                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
 147                 },
 148         },
 149
 150         /*
 151          * These models have a working acpi_video backlight control, and using
 152          * native backlight causes a regression where backlight does not work
 153          * when userspace is not handling brightness key events. Disable
 154          * native_backlight on these to fix this:
 155          * https://bugzilla.kernel.org/show_bug.cgi?id=81691
 156          */
 157         {
 158          .callback = video_detect_force_video,
 159          .ident = "ThinkPad T420",
 160          .matches = {
 161                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 162                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
 163                 },
 164         },
 165         {
 166          .callback = video_detect_force_video,
 167          .ident = "ThinkPad T520",
 168          .matches = {
 169                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 170                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
 171                 },
 172         },
 173         {
 174          .callback = video_detect_force_video,
 175          .ident = "ThinkPad X201s",
 176          .matches = {
 177                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 178                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
 179                 },
 180         },
 181         {
 182          .callback = video_detect_force_video,
 183          .ident = "ThinkPad X201T",
 184          .matches = {
 185                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 186                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
 187                 },
 188         },
 189
 190         /* The native backlight controls do not work on some older machines */
 191         {
 192          /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
 193          .callback = video_detect_force_video,
 194          .ident = "HP ENVY 15 Notebook",
 195          .matches = {
 196                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 197                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
 198                 },
 199         },
 200         {
 201          .callback = video_detect_force_video,
 202          .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E",
 203          .matches = {
 204                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 205                 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
 206                 },
 207         },
 208         {
 209          .callback = video_detect_force_video,
 210          .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V",
 211          .matches = {
 212                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 213                 DMI_MATCH(DMI_PRODUCT_NAME,
 214                           "370R4E/370R4V/370R5E/3570RE/370R5V"),
 215                 },
 216         },
 217         {
 218          /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
 219          .callback = video_detect_force_video,
 220          .ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV",
 221          .matches = {
 222                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 223                 DMI_MATCH(DMI_PRODUCT_NAME,
 224                           "3570R/370R/470R/450R/510R/4450RV"),
 225                 },
 226         },
 227         {
 228          /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
 229          .callback = video_detect_force_video,
 230          .ident = "SAMSUNG 670Z5E",
 231          .matches = {
 232                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 233                 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
 234                 },
 235         },
 236         {
 237          /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
 238          .callback = video_detect_force_video,
 239          .ident = "SAMSUNG 730U3E/740U3E",
 240          .matches = {
 241                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 242                 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
 243                 },
 244         },
 245         {
 246          /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
 247          .callback = video_detect_force_video,
 248          .ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D",
 249          .matches = {
 250                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 251                 DMI_MATCH(DMI_PRODUCT_NAME,
 252                           "900X3C/900X3D/900X3E/900X4C/900X4D"),
 253                 },
 254         },
 255         {
 256          /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
 257          .callback = video_detect_force_video,
 258          .ident = "Dell XPS14 L421X",
 259          .matches = {
 260                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 261                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
 262                 },
 263         },
 264         {
 265          /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
 266          .callback = video_detect_force_video,
 267          .ident = "Dell XPS15 L521X",
 268          .matches = {
 269                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 270                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
 271                 },
 272         },
 273         {
 274          /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
 275          .callback = video_detect_force_video,
 276          .ident = "SAMSUNG 530U4E/540U4E",
 277          .matches = {
 278                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 279                 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
 280                 },
 281         },
 282         /* https://bugs.launchpad.net/bugs/1894667 */
 283         {
 284          .callback = video_detect_force_video,
 285          .ident = "HP 635 Notebook",
 286          .matches = {
 287                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 288                 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
 289                 },
 290         },
 291
 292         /* Non win8 machines which need native backlight nevertheless */
 293         {
 294          /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
 295          .callback = video_detect_force_native,
 296          .ident = "Lenovo Ideapad S405",
 297          .matches = {
 298                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 299                 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
 300                 },
 301         },
 302         {
 303          /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
 304          .callback = video_detect_force_native,
 305          .ident = "Lenovo Ideapad Z570",
 306          .matches = {
 307                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 308                 DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
 309                 },
 310         },
 311         {
 312          .callback = video_detect_force_native,
 313          .ident = "Lenovo E41-25",
 314          .matches = {
 315                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 316                 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
 317                 },
 318         },
 319         {
 320          .callback = video_detect_force_native,
 321          .ident = "Lenovo E41-45",
 322          .matches = {
 323                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 324                 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
 325                 },
 326         },
 327         {
 328          /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
 329          .callback = video_detect_force_native,
 330          .ident = "Apple MacBook Pro 12,1",
 331          .matches = {
 332                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 333                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
 334                 },
 335         },
 336         {
 337          .callback = video_detect_force_native,
 338          .ident = "Dell Vostro V131",
 339          .matches = {
 340                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 341                 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 342                 },
 343         },
 344         {
 345          /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
 346          .callback = video_detect_force_native,
 347          .ident = "Dell XPS 17 L702X",
 348          .matches = {
 349                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 350                 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
 351                 },
 352         },
 353         {
 354          .callback = video_detect_force_native,
 355          .ident = "Dell Precision 7510",
 356          .matches = {
 357                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 358                 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
 359                 },
 360         },
 361         {
 362          .callback = video_detect_force_native,
 363          .ident = "Acer Aspire 5738z",
 364          .matches = {
 365                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 366                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
 367                 DMI_MATCH(DMI_BOARD_NAME, "JV50"),
 368                 },
 369         },
 370         {
 371          /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
 372          .callback = video_detect_force_native,
 373          .ident = "Acer TravelMate 5735Z",
 374          .matches = {
 375                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 376                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
 377                 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
 378                 },
 379         },
 380
 381         /*
 382          * Desktops which falsely report a backlight and which our heuristics
 383          * for this do not catch.
 384          */
 385         {
 386          .callback = video_detect_force_none,
 387          .ident = "Dell OptiPlex 9020M",
 388          .matches = {
 389                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 390                 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
 391                 },
 392         },
 393         {
 394          .callback = video_detect_force_none,
 395          .ident = "MSI MS-7721",
 396          .matches = {
 397                 DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 398                 DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"),
 399                 },
 400         },
 401         { },
 402 };
 403
 404 /* This uses a workqueue to avoid various locking ordering issues */
 405 static void acpi_video_backlight_notify_work(struct work_struct *work)
 406 {
 407         if (acpi_video_get_backlight_type() != acpi_backlight_video)
 408                 acpi_video_unregister_backlight();
 409 }
 410
 411 static int acpi_video_backlight_notify(struct notifier_block *nb,
 412                                        unsigned long val, void *bd)
 413 {
 414         struct backlight_device *backlight = bd;
 415
 416         /* A raw bl registering may change video -> native */
 417         if (backlight->props.type == BACKLIGHT_RAW &&
 418             val == BACKLIGHT_REGISTERED)
 419                 schedule_work(&backlight_notify_work);
 420
 421         return NOTIFY_OK;
 422 }
 423
 424 /*
 425  * Determine which type of backlight interface to use on this system,
 426  * First check cmdline, then dmi quirks, then do autodetect.
 427  *
 428  * The autodetect order is:
 429  * 1) Is the acpi-video backlight interface supported ->
 430  *  no, use a vendor interface
 431  * 2) Is this a win8 "ready" BIOS and do we have a native interface ->
 432  *  yes, use a native interface
 433  * 3) Else use the acpi-video interface
 434  *
 435  * Arguably the native on win8 check should be done first, but that would
 436  * be a behavior change, which may causes issues.
 437  */
 438 enum acpi_backlight_type acpi_video_get_backlight_type(void)
 439 {
 440         static DEFINE_MUTEX(init_mutex);
 441         static bool init_done;
 442         static long video_caps;
 443
 444         /* Parse cmdline, dmi and acpi only once */
 445         mutex_lock(&init_mutex);
 446         if (!init_done) {
 447                 acpi_video_parse_cmdline();
 448                 dmi_check_system(video_detect_dmi_table);
 449                 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 450                                     ACPI_UINT32_MAX, find_video, NULL,
 451                                     &video_caps, NULL);
 452                 INIT_WORK(&backlight_notify_work,
 453                           acpi_video_backlight_notify_work);
 454                 backlight_nb.notifier_call = acpi_video_backlight_notify;
 455                 backlight_nb.priority = 0;
 456                 if (backlight_register_notifier(&backlight_nb) == 0)
 457                         backlight_notifier_registered = true;
 458                 init_done = true;
 459         }
 460         mutex_unlock(&init_mutex);
 461
 462         if (acpi_backlight_cmdline != acpi_backlight_undef)
 463                 return acpi_backlight_cmdline;
 464
 465         if (acpi_backlight_dmi != acpi_backlight_undef)
 466                 return acpi_backlight_dmi;
 467
 468         if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
 469                 return acpi_backlight_vendor;
 470
 471         if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW))
 472                 return acpi_backlight_native;
 473
 474         return acpi_backlight_video;
 475 }
 476 EXPORT_SYMBOL(acpi_video_get_backlight_type);
 477
 478 /*
 479  * Set the preferred backlight interface type based on DMI info.
 480  * This function allows DMI blacklists to be implemented by external
 481  * platform drivers instead of putting a big blacklist in video_detect.c
 482  */
 483 void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
 484 {
 485         acpi_backlight_dmi = type;
 486         /* Remove acpi-video backlight interface if it is no longer desired */
 487         if (acpi_video_get_backlight_type() != acpi_backlight_video)
 488                 acpi_video_unregister_backlight();
 489 }
 490 EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);
 491
 492 void __exit acpi_video_detect_exit(void)
 493 {
 494         if (backlight_notifier_registered)
 495                 backlight_unregister_notifier(&backlight_nb);
 496 }