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 ACPI_MODULE_NAME("video");
  39 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  40
  41 void acpi_video_unregister_backlight(void);
  42
  43 static bool backlight_notifier_registered;
  44 static struct notifier_block backlight_nb;
  45 static struct work_struct backlight_notify_work;
  46
  47 static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
  48 static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
  49
  50 static void acpi_video_parse_cmdline(void)
  51 {
  52         if (!strcmp("vendor", acpi_video_backlight_string))
  53                 acpi_backlight_cmdline = acpi_backlight_vendor;
  54         if (!strcmp("video", acpi_video_backlight_string))
  55                 acpi_backlight_cmdline = acpi_backlight_video;
  56         if (!strcmp("native", acpi_video_backlight_string))
  57                 acpi_backlight_cmdline = acpi_backlight_native;
  58         if (!strcmp("none", acpi_video_backlight_string))
  59                 acpi_backlight_cmdline = acpi_backlight_none;
  60 }
  61
  62 static acpi_status
  63 find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
  64 {
  65         long *cap = context;
  66         struct pci_dev *dev;
  67         struct acpi_device *acpi_dev;
  68
  69         static const struct acpi_device_id video_ids[] = {
  70                 {ACPI_VIDEO_HID, 0},
  71                 {"", 0},
  72         };
  73         if (acpi_bus_get_device(handle, &acpi_dev))
  74                 return AE_OK;
  75
  76         if (!acpi_match_device_ids(acpi_dev, video_ids)) {
  77                 dev = acpi_get_pci_dev(handle);
  78                 if (!dev)
  79                         return AE_OK;
  80                 pci_dev_put(dev);
  81                 *cap |= acpi_is_video_device(handle);
  82         }
  83         return AE_OK;
  84 }
  85
  86 /* Force to use vendor driver when the ACPI device is known to be
  87  * buggy */
  88 static int video_detect_force_vendor(const struct dmi_system_id *d)
  89 {
  90         acpi_backlight_dmi = acpi_backlight_vendor;
  91         return 0;
  92 }
  93
  94 static int video_detect_force_video(const struct dmi_system_id *d)
  95 {
  96         acpi_backlight_dmi = acpi_backlight_video;
  97         return 0;
  98 }
  99
 100 static int video_detect_force_native(const struct dmi_system_id *d)
 101 {
 102         acpi_backlight_dmi = acpi_backlight_native;
 103         return 0;
 104 }
 105
 106 static const struct dmi_system_id video_detect_dmi_table[] = {
 107         /* On Samsung X360, the BIOS will set a flag (VDRV) if generic
 108          * ACPI backlight device is used. This flag will definitively break
 109          * the backlight interface (even the vendor interface) untill next
 110          * reboot. It's why we should prevent video.ko from being used here
 111          * and we can't rely on a later call to acpi_video_unregister().
 112          */
 113         {
 114          .callback = video_detect_force_vendor,
 115          .ident = "X360",
 116          .matches = {
 117                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 118                 DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
 119                 DMI_MATCH(DMI_BOARD_NAME, "X360"),
 120                 },
 121         },
 122         {
 123         .callback = video_detect_force_vendor,
 124         .ident = "Asus UL30VT",
 125         .matches = {
 126                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 127                 DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
 128                 },
 129         },
 130         {
 131         .callback = video_detect_force_vendor,
 132         .ident = "Asus UL30A",
 133         .matches = {
 134                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 135                 DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
 136                 },
 137         },
 138         /*
 139          * Clevo NL5xRU and NL5xNU/TUXEDO Aura 15 Gen1 and Gen2 have both a
 140          * working native and video interface. However the default detection
 141          * mechanism first registers the video interface before unregistering
 142          * it again and switching to the native interface during boot. This
 143          * results in a dangling SBIOS request for backlight change for some
 144          * reason, causing the backlight to switch to ~2% once per boot on the
 145          * first power cord connect or disconnect event. Setting the native
 146          * interface explicitly circumvents this buggy behaviour, by avoiding
 147          * the unregistering process.
 148          */
 149         {
 150         .callback = video_detect_force_native,
 151         .ident = "Clevo NL5xRU",
 152         .matches = {
 153                 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),
 154                 DMI_MATCH(DMI_BOARD_NAME, "NL5xRU"),
 155                 },
 156         },
 157         {
 158         .callback = video_detect_force_native,
 159         .ident = "Clevo NL5xRU",
 160         .matches = {
 161                 DMI_MATCH(DMI_SYS_VENDOR, "SchenkerTechnologiesGmbH"),
 162                 DMI_MATCH(DMI_BOARD_NAME, "NL5xRU"),
 163                 },
 164         },
 165         {
 166         .callback = video_detect_force_native,
 167         .ident = "Clevo NL5xRU",
 168         .matches = {
 169                 DMI_MATCH(DMI_SYS_VENDOR, "Notebook"),
 170                 DMI_MATCH(DMI_BOARD_NAME, "NL5xRU"),
 171                 },
 172         },
 173         {
 174         .callback = video_detect_force_native,
 175         .ident = "Clevo NL5xRU",
 176         .matches = {
 177                 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),
 178                 DMI_MATCH(DMI_BOARD_NAME, "AURA1501"),
 179                 },
 180         },
 181         {
 182         .callback = video_detect_force_native,
 183         .ident = "Clevo NL5xRU",
 184         .matches = {
 185                 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),
 186                 DMI_MATCH(DMI_BOARD_NAME, "EDUBOOK1502"),
 187                 },
 188         },
 189         {
 190         .callback = video_detect_force_native,
 191         .ident = "Clevo NL5xNU",
 192         .matches = {
 193                 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),
 194                 DMI_MATCH(DMI_BOARD_NAME, "NL5xNU"),
 195                 },
 196         },
 197         {
 198         .callback = video_detect_force_native,
 199         .ident = "Clevo NL5xNU",
 200         .matches = {
 201                 DMI_MATCH(DMI_SYS_VENDOR, "SchenkerTechnologiesGmbH"),
 202                 DMI_MATCH(DMI_BOARD_NAME, "NL5xNU"),
 203                 },
 204         },
 205         {
 206         .callback = video_detect_force_native,
 207         .ident = "Clevo NL5xNU",
 208         .matches = {
 209                 DMI_MATCH(DMI_SYS_VENDOR, "Notebook"),
 210                 DMI_MATCH(DMI_BOARD_NAME, "NL5xNU"),
 211                 },
 212         },
 213
 214         /*
 215          * These models have a working acpi_video backlight control, and using
 216          * native backlight causes a regression where backlight does not work
 217          * when userspace is not handling brightness key events. Disable
 218          * native_backlight on these to fix this:
 219          * https://bugzilla.kernel.org/show_bug.cgi?id=81691
 220          */
 221         {
 222          .callback = video_detect_force_video,
 223          .ident = "ThinkPad T420",
 224          .matches = {
 225                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 226                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
 227                 },
 228         },
 229         {
 230          .callback = video_detect_force_video,
 231          .ident = "ThinkPad T520",
 232          .matches = {
 233                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 234                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
 235                 },
 236         },
 237         {
 238          .callback = video_detect_force_video,
 239          .ident = "ThinkPad X201s",
 240          .matches = {
 241                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 242                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
 243                 },
 244         },
 245         {
 246          .callback = video_detect_force_video,
 247          .ident = "ThinkPad X201T",
 248          .matches = {
 249                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 250                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
 251                 },
 252         },
 253
 254         /* The native backlight controls do not work on some older machines */
 255         {
 256          /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
 257          .callback = video_detect_force_video,
 258          .ident = "HP ENVY 15 Notebook",
 259          .matches = {
 260                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 261                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
 262                 },
 263         },
 264         {
 265          .callback = video_detect_force_video,
 266          .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E",
 267          .matches = {
 268                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 269                 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
 270                 },
 271         },
 272         {
 273          .callback = video_detect_force_video,
 274          .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V",
 275          .matches = {
 276                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 277                 DMI_MATCH(DMI_PRODUCT_NAME,
 278                           "370R4E/370R4V/370R5E/3570RE/370R5V"),
 279                 },
 280         },
 281         {
 282          /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
 283          .callback = video_detect_force_video,
 284          .ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV",
 285          .matches = {
 286                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 287                 DMI_MATCH(DMI_PRODUCT_NAME,
 288                           "3570R/370R/470R/450R/510R/4450RV"),
 289                 },
 290         },
 291         {
 292          /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
 293          .callback = video_detect_force_video,
 294          .ident = "SAMSUNG 670Z5E",
 295          .matches = {
 296                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 297                 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
 298                 },
 299         },
 300         {
 301          /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
 302          .callback = video_detect_force_video,
 303          .ident = "SAMSUNG 730U3E/740U3E",
 304          .matches = {
 305                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 306                 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
 307                 },
 308         },
 309         {
 310          /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
 311          .callback = video_detect_force_video,
 312          .ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D",
 313          .matches = {
 314                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 315                 DMI_MATCH(DMI_PRODUCT_NAME,
 316                           "900X3C/900X3D/900X3E/900X4C/900X4D"),
 317                 },
 318         },
 319         {
 320          /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
 321          .callback = video_detect_force_video,
 322          .ident = "Dell XPS14 L421X",
 323          .matches = {
 324                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 325                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
 326                 },
 327         },
 328         {
 329          /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
 330          .callback = video_detect_force_video,
 331          .ident = "Dell XPS15 L521X",
 332          .matches = {
 333                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 334                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
 335                 },
 336         },
 337         {
 338          /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
 339          .callback = video_detect_force_video,
 340          .ident = "SAMSUNG 530U4E/540U4E",
 341          .matches = {
 342                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 343                 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
 344                 },
 345         },
 346         /* https://bugs.launchpad.net/bugs/1894667 */
 347         {
 348          .callback = video_detect_force_video,
 349          .ident = "HP 635 Notebook",
 350          .matches = {
 351                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 352                 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
 353                 },
 354         },
 355
 356         /* Non win8 machines which need native backlight nevertheless */
 357         {
 358          /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
 359          .callback = video_detect_force_native,
 360          .ident = "Lenovo Ideapad S405",
 361          .matches = {
 362                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 363                 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
 364                 },
 365         },
 366         {
 367          /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
 368          .callback = video_detect_force_native,
 369          .ident = "Lenovo Ideapad Z570",
 370          .matches = {
 371                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 372                 DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
 373                 },
 374         },
 375         {
 376          /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
 377          .callback = video_detect_force_native,
 378          .ident = "Apple MacBook Pro 12,1",
 379          .matches = {
 380                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 381                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
 382                 },
 383         },
 384         {
 385          .callback = video_detect_force_native,
 386          .ident = "Dell Vostro V131",
 387          .matches = {
 388                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 389                 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 390                 },
 391         },
 392         {
 393          /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
 394          .callback = video_detect_force_native,
 395          .ident = "Dell XPS 17 L702X",
 396          .matches = {
 397                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 398                 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
 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 }