LXR linux/drivers/acpi/video

   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        .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 */
 412static 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
 418static 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 */
 445enum 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}
 483EXPORT_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 */
 490void 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}
 497EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);
 498
 499void __exit acpi_video_detect_exit(void)
 500{
 501        if (backlight_notifier_registered)
 502                backlight_unregister_notifier(&backlight_nb);
 503}
 504