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
  38ACPI_MODULE_NAME("video");
  39#define _COMPONENT              ACPI_VIDEO_COMPONENT
  40
  41void acpi_video_unregister_backlight(void);
  42
  43static bool backlight_notifier_registered;
  44static struct notifier_block backlight_nb;
  45static struct work_struct backlight_notify_work;
  46
  47static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
  48static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
  49
  50static 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
  62static acpi_status
  63find_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 */
  88static int video_detect_force_vendor(const struct dmi_system_id *d)
  89{
  90        acpi_backlight_dmi = acpi_backlight_vendor;
  91        return 0;
  92}
  93
  94static int video_detect_force_video(const struct dmi_system_id *d)
  95{
  96        acpi_backlight_dmi = acpi_backlight_video;
  97        return 0;
  98}
  99
 100static int video_detect_force_native(const struct dmi_system_id *d)
 101{
 102        acpi_backlight_dmi = acpi_backlight_native;
 103        return 0;
 104}
 105
 106static int video_detect_force_none(const struct dmi_system_id *d)
 107{
 108        acpi_backlight_dmi = acpi_backlight_none;
 109        return 0;
 110}
 111
 112static const struct dmi_system_id video_detect_dmi_table[] = {
 113        /* On Samsung X360, the BIOS will set a flag (VDRV) if generic
 114         * ACPI backlight device is used. This flag will definitively break
 115         * the backlight interface (even the vendor interface) untill next
 116         * reboot. It's why we should prevent video.ko from being used here
 117         * and we can't rely on a later call to acpi_video_unregister().
 118         */
 119        {
 120         .callback = video_detect_force_vendor,
 121         .ident = "X360",
 122         .matches = {
 123                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 124                DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
 125                DMI_MATCH(DMI_BOARD_NAME, "X360"),
 126                },
 127        },
 128        {
 129        .callback = video_detect_force_vendor,
 130        .ident = "Asus UL30VT",
 131        .matches = {
 132                DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 133                DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
 134                },
 135        },
 136        {
 137        .callback = video_detect_force_vendor,
 138        .ident = "Asus UL30A",
 139        .matches = {
 140                DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 141                DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
 142                },
 143        },
 144
 145        /*
 146         * These models have a working acpi_video backlight control, and using
 147         * native backlight causes a regression where backlight does not work
 148         * when userspace is not handling brightness key events. Disable
 149         * native_backlight on these to fix this:
 150         * https://bugzilla.kernel.org/show_bug.cgi?id=81691
 151         */
 152        {
 153         .callback = video_detect_force_video,
 154         .ident = "ThinkPad T420",
 155         .matches = {
 156                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 157                DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
 158                },
 159        },
 160        {
 161         .callback = video_detect_force_video,
 162         .ident = "ThinkPad T520",
 163         .matches = {
 164                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 165                DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
 166                },
 167        },
 168        {
 169         .callback = video_detect_force_video,
 170         .ident = "ThinkPad X201s",
 171         .matches = {
 172                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 173                DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
 174                },
 175        },
 176        {
 177         .callback = video_detect_force_video,
 178         .ident = "ThinkPad X201T",
 179         .matches = {
 180                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 181                DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
 182                },
 183        },
 184
 185        /* The native backlight controls do not work on some older machines */
 186        {
 187         /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
 188         .callback = video_detect_force_video,
 189         .ident = "HP ENVY 15 Notebook",
 190         .matches = {
 191                DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 192                DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
 193                },
 194        },
 195        {
 196         .callback = video_detect_force_video,
 197         .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E",
 198         .matches = {
 199                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 200                DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
 201                },
 202        },
 203        {
 204         .callback = video_detect_force_video,
 205         .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V",
 206         .matches = {
 207                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 208                DMI_MATCH(DMI_PRODUCT_NAME,
 209                          "370R4E/370R4V/370R5E/3570RE/370R5V"),
 210                },
 211        },
 212        {
 213         /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
 214         .callback = video_detect_force_video,
 215         .ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV",
 216         .matches = {
 217                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 218                DMI_MATCH(DMI_PRODUCT_NAME,
 219                          "3570R/370R/470R/450R/510R/4450RV"),
 220                },
 221        },
 222        {
 223         /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
 224         .callback = video_detect_force_video,
 225         .ident = "SAMSUNG 670Z5E",
 226         .matches = {
 227                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 228                DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
 229                },
 230        },
 231        {
 232         /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
 233         .callback = video_detect_force_video,
 234         .ident = "SAMSUNG 730U3E/740U3E",
 235         .matches = {
 236                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 237                DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
 238                },
 239        },
 240        {
 241         /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
 242         .callback = video_detect_force_video,
 243         .ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D",
 244         .matches = {
 245                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 246                DMI_MATCH(DMI_PRODUCT_NAME,
 247                          "900X3C/900X3D/900X3E/900X4C/900X4D"),
 248                },
 249        },
 250        {
 251         /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
 252         .callback = video_detect_force_video,
 253         .ident = "Dell XPS14 L421X",
 254         .matches = {
 255                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 256                DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
 257                },
 258        },
 259        {
 260         /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
 261         .callback = video_detect_force_video,
 262         .ident = "Dell XPS15 L521X",
 263         .matches = {
 264                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 265                DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
 266                },
 267        },
 268        {
 269         /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
 270         .callback = video_detect_force_video,
 271         .ident = "SAMSUNG 530U4E/540U4E",
 272         .matches = {
 273                DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 274                DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
 275                },
 276        },
 277
 278        /* Non win8 machines which need native backlight nevertheless */
 279        {
 280         /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
 281         .callback = video_detect_force_native,
 282         .ident = "Lenovo Ideapad S405",
 283         .matches = {
 284                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 285                DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
 286                },
 287        },
 288        {
 289         /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
 290         .callback = video_detect_force_native,
 291         .ident = "Lenovo Ideapad Z570",
 292         .matches = {
 293                DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 294                DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
 295                },
 296        },
 297        {
 298         /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
 299         .callback = video_detect_force_native,
 300         .ident = "Apple MacBook Pro 12,1",
 301         .matches = {
 302                DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 303                DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
 304                },
 305        },
 306        {
 307         .callback = video_detect_force_native,
 308         .ident = "Dell Vostro V131",
 309         .matches = {
 310                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 311                DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 312                },
 313        },
 314        {
 315         /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
 316         .callback = video_detect_force_native,
 317         .ident = "Dell XPS 17 L702X",
 318         .matches = {
 319                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 320                DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
 321                },
 322        },
 323        {
 324         .callback = video_detect_force_native,
 325         .ident = "Dell Precision 7510",
 326         .matches = {
 327                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 328                DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
 329                },
 330        },
 331        {
 332         .callback = video_detect_force_none,
 333         .ident = "Dell OptiPlex 9020M",
 334         .matches = {
 335                DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 336                DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
 337                },
 338        },
 339        { },
 340};
 341
 342/* This uses a workqueue to avoid various locking ordering issues */
 343static void acpi_video_backlight_notify_work(struct work_struct *work)
 344{
 345        if (acpi_video_get_backlight_type() != acpi_backlight_video)
 346                acpi_video_unregister_backlight();
 347}
 348
 349static int acpi_video_backlight_notify(struct notifier_block *nb,
 350                                       unsigned long val, void *bd)
 351{
 352        struct backlight_device *backlight = bd;
 353
 354        /* A raw bl registering may change video -> native */
 355        if (backlight->props.type == BACKLIGHT_RAW &&
 356            val == BACKLIGHT_REGISTERED)
 357                schedule_work(&backlight_notify_work);
 358
 359        return NOTIFY_OK;
 360}
 361
 362/*
 363 * Determine which type of backlight interface to use on this system,
 364 * First check cmdline, then dmi quirks, then do autodetect.
 365 *
 366 * The autodetect order is:
 367 * 1) Is the acpi-video backlight interface supported ->
 368 *  no, use a vendor interface
 369 * 2) Is this a win8 "ready" BIOS and do we have a native interface ->
 370 *  yes, use a native interface
 371 * 3) Else use the acpi-video interface
 372 *
 373 * Arguably the native on win8 check should be done first, but that would
 374 * be a behavior change, which may causes issues.
 375 */
 376enum acpi_backlight_type acpi_video_get_backlight_type(void)
 377{
 378        static DEFINE_MUTEX(init_mutex);
 379        static bool init_done;
 380        static long video_caps;
 381
 382        /* Parse cmdline, dmi and acpi only once */
 383        mutex_lock(&init_mutex);
 384        if (!init_done) {
 385                acpi_video_parse_cmdline();
 386                dmi_check_system(video_detect_dmi_table);
 387                acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 388                                    ACPI_UINT32_MAX, find_video, NULL,
 389                                    &video_caps, NULL);
 390                INIT_WORK(&backlight_notify_work,
 391                          acpi_video_backlight_notify_work);
 392                backlight_nb.notifier_call = acpi_video_backlight_notify;
 393                backlight_nb.priority = 0;
 394                if (backlight_register_notifier(&backlight_nb) == 0)
 395                        backlight_notifier_registered = true;
 396                init_done = true;
 397        }
 398        mutex_unlock(&init_mutex);
 399
 400        if (acpi_backlight_cmdline != acpi_backlight_undef)
 401                return acpi_backlight_cmdline;
 402
 403        if (acpi_backlight_dmi != acpi_backlight_undef)
 404                return acpi_backlight_dmi;
 405
 406        if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
 407                return acpi_backlight_vendor;
 408
 409        if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW))
 410                return acpi_backlight_native;
 411
 412        return acpi_backlight_video;
 413}
 414EXPORT_SYMBOL(acpi_video_get_backlight_type);
 415
 416/*
 417 * Set the preferred backlight interface type based on DMI info.
 418 * This function allows DMI blacklists to be implemented by external
 419 * platform drivers instead of putting a big blacklist in video_detect.c
 420 */
 421void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
 422{
 423        acpi_backlight_dmi = type;
 424        /* Remove acpi-video backlight interface if it is no longer desired */
 425        if (acpi_video_get_backlight_type() != acpi_backlight_video)
 426                acpi_video_unregister_backlight();
 427}
 428EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);
 429
 430void __exit acpi_video_detect_exit(void)
 431{
 432        if (backlight_notifier_registered)
 433                backlight_unregister_notifier(&backlight_nb);
 434}
 435