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 int video_detect_force_none(const struct dmi_system_id *d)
 107 {
 108         acpi_backlight_dmi = acpi_backlight_none;
 109         return 0;
 110 }
 111
 112 static 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=1094948 */
 224          .callback = video_detect_force_video,
 225          .ident = "SAMSUNG 730U3E/740U3E",
 226          .matches = {
 227                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 228                 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
 229                 },
 230         },
 231         {
 232          /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
 233          .callback = video_detect_force_video,
 234          .ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D",
 235          .matches = {
 236                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 237                 DMI_MATCH(DMI_PRODUCT_NAME,
 238                           "900X3C/900X3D/900X3E/900X4C/900X4D"),
 239                 },
 240         },
 241         {
 242          /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
 243          .callback = video_detect_force_video,
 244          .ident = "Dell XPS14 L421X",
 245          .matches = {
 246                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 247                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
 248                 },
 249         },
 250         {
 251          /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
 252          .callback = video_detect_force_video,
 253          .ident = "Dell XPS15 L521X",
 254          .matches = {
 255                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 256                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
 257                 },
 258         },
 259         {
 260          /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
 261          .callback = video_detect_force_video,
 262          .ident = "SAMSUNG 530U4E/540U4E",
 263          .matches = {
 264                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 265                 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
 266                 },
 267         },
 268
 269         /* Non win8 machines which need native backlight nevertheless */
 270         {
 271          /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
 272          .callback = video_detect_force_native,
 273          .ident = "Lenovo Ideapad S405",
 274          .matches = {
 275                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 276                 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
 277                 },
 278         },
 279         {
 280          /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
 281          .callback = video_detect_force_native,
 282          .ident = "Lenovo Ideapad Z570",
 283          .matches = {
 284                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 285                 DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
 286                 },
 287         },
 288         {
 289          /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
 290          .callback = video_detect_force_native,
 291          .ident = "Apple MacBook Pro 12,1",
 292          .matches = {
 293                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 294                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
 295                 },
 296         },
 297         {
 298          .callback = video_detect_force_native,
 299          .ident = "Dell Vostro V131",
 300          .matches = {
 301                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 302                 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 303                 },
 304         },
 305         {
 306          /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
 307          .callback = video_detect_force_native,
 308          .ident = "Dell XPS 17 L702X",
 309          .matches = {
 310                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 311                 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
 312                 },
 313         },
 314         {
 315          .callback = video_detect_force_native,
 316          .ident = "Dell Precision 7510",
 317          .matches = {
 318                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 319                 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
 320                 },
 321         },
 322         {
 323          .callback = video_detect_force_none,
 324          .ident = "Dell OptiPlex 9020M",
 325          .matches = {
 326                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 327                 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
 328                 },
 329         },
 330         { },
 331 };
 332
 333 /* This uses a workqueue to avoid various locking ordering issues */
 334 static void acpi_video_backlight_notify_work(struct work_struct *work)
 335 {
 336         if (acpi_video_get_backlight_type() != acpi_backlight_video)
 337                 acpi_video_unregister_backlight();
 338 }
 339
 340 static int acpi_video_backlight_notify(struct notifier_block *nb,
 341                                        unsigned long val, void *bd)
 342 {
 343         struct backlight_device *backlight = bd;
 344
 345         /* A raw bl registering may change video -> native */
 346         if (backlight->props.type == BACKLIGHT_RAW &&
 347             val == BACKLIGHT_REGISTERED)
 348                 schedule_work(&backlight_notify_work);
 349
 350         return NOTIFY_OK;
 351 }
 352
 353 /*
 354  * Determine which type of backlight interface to use on this system,
 355  * First check cmdline, then dmi quirks, then do autodetect.
 356  *
 357  * The autodetect order is:
 358  * 1) Is the acpi-video backlight interface supported ->
 359  *  no, use a vendor interface
 360  * 2) Is this a win8 "ready" BIOS and do we have a native interface ->
 361  *  yes, use a native interface
 362  * 3) Else use the acpi-video interface
 363  *
 364  * Arguably the native on win8 check should be done first, but that would
 365  * be a behavior change, which may causes issues.
 366  */
 367 enum acpi_backlight_type acpi_video_get_backlight_type(void)
 368 {
 369         static DEFINE_MUTEX(init_mutex);
 370         static bool init_done;
 371         static long video_caps;
 372
 373         /* Parse cmdline, dmi and acpi only once */
 374         mutex_lock(&init_mutex);
 375         if (!init_done) {
 376                 acpi_video_parse_cmdline();
 377                 dmi_check_system(video_detect_dmi_table);
 378                 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 379                                     ACPI_UINT32_MAX, find_video, NULL,
 380                                     &video_caps, NULL);
 381                 INIT_WORK(&backlight_notify_work,
 382                           acpi_video_backlight_notify_work);
 383                 backlight_nb.notifier_call = acpi_video_backlight_notify;
 384                 backlight_nb.priority = 0;
 385                 if (backlight_register_notifier(&backlight_nb) == 0)
 386                         backlight_notifier_registered = true;
 387                 init_done = true;
 388         }
 389         mutex_unlock(&init_mutex);
 390
 391         if (acpi_backlight_cmdline != acpi_backlight_undef)
 392                 return acpi_backlight_cmdline;
 393
 394         if (acpi_backlight_dmi != acpi_backlight_undef)
 395                 return acpi_backlight_dmi;
 396
 397         if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
 398                 return acpi_backlight_vendor;
 399
 400         if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW))
 401                 return acpi_backlight_native;
 402
 403         return acpi_backlight_video;
 404 }
 405 EXPORT_SYMBOL(acpi_video_get_backlight_type);
 406
 407 /*
 408  * Set the preferred backlight interface type based on DMI info.
 409  * This function allows DMI blacklists to be implemented by external
 410  * platform drivers instead of putting a big blacklist in video_detect.c
 411  */
 412 void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
 413 {
 414         acpi_backlight_dmi = type;
 415         /* Remove acpi-video backlight interface if it is no longer desired */
 416         if (acpi_video_get_backlight_type() != acpi_backlight_video)
 417                 acpi_video_unregister_backlight();
 418 }
 419 EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);
 420
 421 void __exit acpi_video_detect_exit(void)
 422 {
 423         if (backlight_notifier_registered)
 424                 backlight_unregister_notifier(&backlight_nb);
 425 }