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 <acpi/video.h>
  36
  37 ACPI_MODULE_NAME("video");
  38 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  39
  40 static bool backlight_notifier_registered;
  41 static struct notifier_block backlight_nb;
  42
  43 static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
  44 static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
  45
  46 static void acpi_video_parse_cmdline(void)
  47 {
  48         if (!strcmp("vendor", acpi_video_backlight_string))
  49                 acpi_backlight_cmdline = acpi_backlight_vendor;
  50         if (!strcmp("video", acpi_video_backlight_string))
  51                 acpi_backlight_cmdline = acpi_backlight_video;
  52         if (!strcmp("native", acpi_video_backlight_string))
  53                 acpi_backlight_cmdline = acpi_backlight_native;
  54         if (!strcmp("none", acpi_video_backlight_string))
  55                 acpi_backlight_cmdline = acpi_backlight_none;
  56 }
  57
  58 static acpi_status
  59 find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
  60 {
  61         long *cap = context;
  62         struct pci_dev *dev;
  63         struct acpi_device *acpi_dev;
  64
  65         static const struct acpi_device_id video_ids[] = {
  66                 {ACPI_VIDEO_HID, 0},
  67                 {"", 0},
  68         };
  69         if (acpi_bus_get_device(handle, &acpi_dev))
  70                 return AE_OK;
  71
  72         if (!acpi_match_device_ids(acpi_dev, video_ids)) {
  73                 dev = acpi_get_pci_dev(handle);
  74                 if (!dev)
  75                         return AE_OK;
  76                 pci_dev_put(dev);
  77                 *cap |= acpi_is_video_device(handle);
  78         }
  79         return AE_OK;
  80 }
  81
  82 /* Force to use vendor driver when the ACPI device is known to be
  83  * buggy */
  84 static int video_detect_force_vendor(const struct dmi_system_id *d)
  85 {
  86         acpi_backlight_dmi = acpi_backlight_vendor;
  87         return 0;
  88 }
  89
  90 static int video_detect_force_video(const struct dmi_system_id *d)
  91 {
  92         acpi_backlight_dmi = acpi_backlight_video;
  93         return 0;
  94 }
  95
  96 static int video_detect_force_native(const struct dmi_system_id *d)
  97 {
  98         acpi_backlight_dmi = acpi_backlight_native;
  99         return 0;
 100 }
 101
 102 static const struct dmi_system_id video_detect_dmi_table[] = {
 103         /* On Samsung X360, the BIOS will set a flag (VDRV) if generic
 104          * ACPI backlight device is used. This flag will definitively break
 105          * the backlight interface (even the vendor interface) untill next
 106          * reboot. It's why we should prevent video.ko from being used here
 107          * and we can't rely on a later call to acpi_video_unregister().
 108          */
 109         {
 110          .callback = video_detect_force_vendor,
 111          .ident = "X360",
 112          .matches = {
 113                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 114                 DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
 115                 DMI_MATCH(DMI_BOARD_NAME, "X360"),
 116                 },
 117         },
 118         {
 119         .callback = video_detect_force_vendor,
 120         .ident = "Asus UL30VT",
 121         .matches = {
 122                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 123                 DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
 124                 },
 125         },
 126         {
 127         .callback = video_detect_force_vendor,
 128         .ident = "Asus UL30A",
 129         .matches = {
 130                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 131                 DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
 132                 },
 133         },
 134         {
 135         .callback = video_detect_force_vendor,
 136         .ident = "Dell Inspiron 5737",
 137         .matches = {
 138                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 139                 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5737"),
 140                 },
 141         },
 142
 143         /*
 144          * These models have a working acpi_video backlight control, and using
 145          * native backlight causes a regression where backlight does not work
 146          * when userspace is not handling brightness key events. Disable
 147          * native_backlight on these to fix this:
 148          * https://bugzilla.kernel.org/show_bug.cgi?id=81691
 149          */
 150         {
 151          .callback = video_detect_force_video,
 152          .ident = "ThinkPad T420",
 153          .matches = {
 154                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 155                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
 156                 },
 157         },
 158         {
 159          .callback = video_detect_force_video,
 160          .ident = "ThinkPad T520",
 161          .matches = {
 162                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 163                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
 164                 },
 165         },
 166         {
 167          .callback = video_detect_force_video,
 168          .ident = "ThinkPad X201s",
 169          .matches = {
 170                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 171                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
 172                 },
 173         },
 174
 175         /* The native backlight controls do not work on some older machines */
 176         {
 177          /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
 178          .callback = video_detect_force_video,
 179          .ident = "HP ENVY 15 Notebook",
 180          .matches = {
 181                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 182                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
 183                 },
 184         },
 185         {
 186          .callback = video_detect_force_video,
 187          .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E",
 188          .matches = {
 189                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 190                 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
 191                 },
 192         },
 193         {
 194          .callback = video_detect_force_video,
 195          .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V",
 196          .matches = {
 197                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 198                 DMI_MATCH(DMI_PRODUCT_NAME,
 199                           "370R4E/370R4V/370R5E/3570RE/370R5V"),
 200                 },
 201         },
 202         {
 203          /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
 204          .callback = video_detect_force_video,
 205          .ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV",
 206          .matches = {
 207                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 208                 DMI_MATCH(DMI_PRODUCT_NAME,
 209                           "3570R/370R/470R/450R/510R/4450RV"),
 210                 },
 211         },
 212         {
 213          /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
 214          .callback = video_detect_force_video,
 215          .ident = "SAMSUNG 730U3E/740U3E",
 216          .matches = {
 217                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 218                 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
 219                 },
 220         },
 221         {
 222          /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
 223          .callback = video_detect_force_video,
 224          .ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D",
 225          .matches = {
 226                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 227                 DMI_MATCH(DMI_PRODUCT_NAME,
 228                           "900X3C/900X3D/900X3E/900X4C/900X4D"),
 229                 },
 230         },
 231         {
 232          /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
 233          .callback = video_detect_force_video,
 234          .ident = "Dell XPS15 L521X",
 235          .matches = {
 236                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 237                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
 238                 },
 239         },
 240
 241         /* Non win8 machines which need native backlight nevertheless */
 242         {
 243          /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
 244          .callback = video_detect_force_native,
 245          .ident = "Lenovo Ideapad Z570",
 246          .matches = {
 247                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 248                 DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
 249                 },
 250         },
 251         {
 252          /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
 253          .callback = video_detect_force_native,
 254          .ident = "Apple MacBook Pro 12,1",
 255          .matches = {
 256                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 257                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
 258                 },
 259         },
 260         { },
 261 };
 262
 263 static int acpi_video_backlight_notify(struct notifier_block *nb,
 264                                        unsigned long val, void *bd)
 265 {
 266         struct backlight_device *backlight = bd;
 267
 268         /* A raw bl registering may change video -> native */
 269         if (backlight->props.type == BACKLIGHT_RAW &&
 270             val == BACKLIGHT_REGISTERED &&
 271             acpi_video_get_backlight_type() != acpi_backlight_video)
 272                 acpi_video_unregister_backlight();
 273
 274         return NOTIFY_OK;
 275 }
 276
 277 /*
 278  * Determine which type of backlight interface to use on this system,
 279  * First check cmdline, then dmi quirks, then do autodetect.
 280  *
 281  * The autodetect order is:
 282  * 1) Is the acpi-video backlight interface supported ->
 283  *  no, use a vendor interface
 284  * 2) Is this a win8 "ready" BIOS and do we have a native interface ->
 285  *  yes, use a native interface
 286  * 3) Else use the acpi-video interface
 287  *
 288  * Arguably the native on win8 check should be done first, but that would
 289  * be a behavior change, which may causes issues.
 290  */
 291 enum acpi_backlight_type acpi_video_get_backlight_type(void)
 292 {
 293         static DEFINE_MUTEX(init_mutex);
 294         static bool init_done;
 295         static long video_caps;
 296
 297         /* Parse cmdline, dmi and acpi only once */
 298         mutex_lock(&init_mutex);
 299         if (!init_done) {
 300                 acpi_video_parse_cmdline();
 301                 dmi_check_system(video_detect_dmi_table);
 302                 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 303                                     ACPI_UINT32_MAX, find_video, NULL,
 304                                     &video_caps, NULL);
 305                 backlight_nb.notifier_call = acpi_video_backlight_notify;
 306                 backlight_nb.priority = 0;
 307                 if (backlight_register_notifier(&backlight_nb) == 0)
 308                         backlight_notifier_registered = true;
 309                 init_done = true;
 310         }
 311         mutex_unlock(&init_mutex);
 312
 313         if (acpi_backlight_cmdline != acpi_backlight_undef)
 314                 return acpi_backlight_cmdline;
 315
 316         if (acpi_backlight_dmi != acpi_backlight_undef)
 317                 return acpi_backlight_dmi;
 318
 319         if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
 320                 return acpi_backlight_vendor;
 321
 322         if (acpi_osi_is_win8() && backlight_device_registered(BACKLIGHT_RAW))
 323                 return acpi_backlight_native;
 324
 325         return acpi_backlight_video;
 326 }
 327 EXPORT_SYMBOL(acpi_video_get_backlight_type);
 328
 329 /*
 330  * Set the preferred backlight interface type based on DMI info.
 331  * This function allows DMI blacklists to be implemented by external
 332  * platform drivers instead of putting a big blacklist in video_detect.c
 333  */
 334 void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
 335 {
 336         acpi_backlight_dmi = type;
 337         /* Remove acpi-video backlight interface if it is no longer desired */
 338         if (acpi_video_get_backlight_type() != acpi_backlight_video)
 339                 acpi_video_unregister_backlight();
 340 }
 341 EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);
 342
 343 void __exit acpi_video_detect_exit(void)
 344 {
 345         if (backlight_notifier_registered)
 346                 backlight_unregister_notifier(&backlight_nb);
 347 }