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