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