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=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         /*
 333          * Desktops which falsely report a backlight and which our heuristics
 334          * for this do not catch.
 335          */
 336         {
 337          .callback = video_detect_force_none,
 338          .ident = "Dell OptiPlex 9020M",
 339          .matches = {
 340                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 341                 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
 342                 },
 343         },
 344         {
 345          .callback = video_detect_force_none,
 346          .ident = "MSI MS-7721",
 347          .matches = {
 348                 DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
 349                 DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"),
 350                 },
 351         },
 352         { },
 353 };
 354
 355 /* This uses a workqueue to avoid various locking ordering issues */
 356 static void acpi_video_backlight_notify_work(struct work_struct *work)
 357 {
 358         if (acpi_video_get_backlight_type() != acpi_backlight_video)
 359                 acpi_video_unregister_backlight();
 360 }
 361
 362 static int acpi_video_backlight_notify(struct notifier_block *nb,
 363                                        unsigned long val, void *bd)
 364 {
 365         struct backlight_device *backlight = bd;
 366
 367         /* A raw bl registering may change video -> native */
 368         if (backlight->props.type == BACKLIGHT_RAW &&
 369             val == BACKLIGHT_REGISTERED)
 370                 schedule_work(&backlight_notify_work);
 371
 372         return NOTIFY_OK;
 373 }
 374
 375 /*
 376  * Determine which type of backlight interface to use on this system,
 377  * First check cmdline, then dmi quirks, then do autodetect.
 378  *
 379  * The autodetect order is:
 380  * 1) Is the acpi-video backlight interface supported ->
 381  *  no, use a vendor interface
 382  * 2) Is this a win8 "ready" BIOS and do we have a native interface ->
 383  *  yes, use a native interface
 384  * 3) Else use the acpi-video interface
 385  *
 386  * Arguably the native on win8 check should be done first, but that would
 387  * be a behavior change, which may causes issues.
 388  */
 389 enum acpi_backlight_type acpi_video_get_backlight_type(void)
 390 {
 391         static DEFINE_MUTEX(init_mutex);
 392         static bool init_done;
 393         static long video_caps;
 394
 395         /* Parse cmdline, dmi and acpi only once */
 396         mutex_lock(&init_mutex);
 397         if (!init_done) {
 398                 acpi_video_parse_cmdline();
 399                 dmi_check_system(video_detect_dmi_table);
 400                 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 401                                     ACPI_UINT32_MAX, find_video, NULL,
 402                                     &video_caps, NULL);
 403                 INIT_WORK(&backlight_notify_work,
 404                           acpi_video_backlight_notify_work);
 405                 backlight_nb.notifier_call = acpi_video_backlight_notify;
 406                 backlight_nb.priority = 0;
 407                 if (backlight_register_notifier(&backlight_nb) == 0)
 408                         backlight_notifier_registered = true;
 409                 init_done = true;
 410         }
 411         mutex_unlock(&init_mutex);
 412
 413         if (acpi_backlight_cmdline != acpi_backlight_undef)
 414                 return acpi_backlight_cmdline;
 415
 416         if (acpi_backlight_dmi != acpi_backlight_undef)
 417                 return acpi_backlight_dmi;
 418
 419         if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
 420                 return acpi_backlight_vendor;
 421
 422         if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW))
 423                 return acpi_backlight_native;
 424
 425         return acpi_backlight_video;
 426 }
 427 EXPORT_SYMBOL(acpi_video_get_backlight_type);
 428
 429 /*
 430  * Set the preferred backlight interface type based on DMI info.
 431  * This function allows DMI blacklists to be implemented by external
 432  * platform drivers instead of putting a big blacklist in video_detect.c
 433  */
 434 void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
 435 {
 436         acpi_backlight_dmi = type;
 437         /* Remove acpi-video backlight interface if it is no longer desired */
 438         if (acpi_video_get_backlight_type() != acpi_backlight_video)
 439                 acpi_video_unregister_backlight();
 440 }
 441 EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);
 442
 443 void __exit acpi_video_detect_exit(void)
 444 {
 445         if (backlight_notifier_registered)
 446                 backlight_unregister_notifier(&backlight_nb);
 447 }