| /* |
| * Copyright (C) 2015 Red Hat Inc. |
| * Hans de Goede <hdegoede@redhat.com> |
| * Copyright (C) 2008 SuSE Linux Products GmbH |
| * Thomas Renninger <trenn@suse.de> |
| * |
| * May be copied or modified under the terms of the GNU General Public License |
| * |
| * video_detect.c: |
| * After PCI devices are glued with ACPI devices |
| * acpi_get_pci_dev() can be called to identify ACPI graphics |
| * devices for which a real graphics card is plugged in |
| * |
| * Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B) |
| * are available, video.ko should be used to handle the device. |
| * |
| * Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop, |
| * sony_acpi,... can take care about backlight brightness. |
| * |
| * Backlight drivers can use acpi_video_get_backlight_type() to determine |
| * which driver should handle the backlight. |
| * |
| * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m) |
| * this file will not be compiled and acpi_video_get_backlight_type() will |
| * always return acpi_backlight_vendor. |
| */ |
| |
| #include <linux/export.h> |
| #include <linux/acpi.h> |
| #include <linux/backlight.h> |
| #include <linux/dmi.h> |
| #include <linux/module.h> |
| #include <linux/pci.h> |
| #include <linux/types.h> |
| #include <linux/workqueue.h> |
| #include <acpi/video.h> |
| |
| void acpi_video_unregister_backlight(void); |
| |
| static bool backlight_notifier_registered; |
| static struct notifier_block backlight_nb; |
| static struct work_struct backlight_notify_work; |
| |
| static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef; |
| static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef; |
| |
| static void acpi_video_parse_cmdline(void) |
| { |
| if (!strcmp("vendor", acpi_video_backlight_string)) |
| acpi_backlight_cmdline = acpi_backlight_vendor; |
| if (!strcmp("video", acpi_video_backlight_string)) |
| acpi_backlight_cmdline = acpi_backlight_video; |
| if (!strcmp("native", acpi_video_backlight_string)) |
| acpi_backlight_cmdline = acpi_backlight_native; |
| if (!strcmp("none", acpi_video_backlight_string)) |
| acpi_backlight_cmdline = acpi_backlight_none; |
| } |
| |
| static acpi_status |
| find_video(acpi_handle handle, u32 lvl, void *context, void **rv) |
| { |
| struct acpi_device *acpi_dev = acpi_fetch_acpi_dev(handle); |
| long *cap = context; |
| struct pci_dev *dev; |
| |
| static const struct acpi_device_id video_ids[] = { |
| {ACPI_VIDEO_HID, 0}, |
| {"", 0}, |
| }; |
| |
| if (acpi_dev && !acpi_match_device_ids(acpi_dev, video_ids)) { |
| dev = acpi_get_pci_dev(handle); |
| if (!dev) |
| return AE_OK; |
| pci_dev_put(dev); |
| *cap |= acpi_is_video_device(handle); |
| } |
| return AE_OK; |
| } |
| |
| /* Force to use vendor driver when the ACPI device is known to be |
| * buggy */ |
| static int video_detect_force_vendor(const struct dmi_system_id *d) |
| { |
| acpi_backlight_dmi = acpi_backlight_vendor; |
| return 0; |
| } |
| |
| static int video_detect_force_video(const struct dmi_system_id *d) |
| { |
| acpi_backlight_dmi = acpi_backlight_video; |
| return 0; |
| } |
| |
| static int video_detect_force_native(const struct dmi_system_id *d) |
| { |
| acpi_backlight_dmi = acpi_backlight_native; |
| return 0; |
| } |
| |
| static int video_detect_force_none(const struct dmi_system_id *d) |
| { |
| acpi_backlight_dmi = acpi_backlight_none; |
| return 0; |
| } |
| |
| static const struct dmi_system_id video_detect_dmi_table[] = { |
| /* On Samsung X360, the BIOS will set a flag (VDRV) if generic |
| * ACPI backlight device is used. This flag will definitively break |
| * the backlight interface (even the vendor interface) until next |
| * reboot. It's why we should prevent video.ko from being used here |
| * and we can't rely on a later call to acpi_video_unregister(). |
| */ |
| { |
| .callback = video_detect_force_vendor, |
| /* X360 */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "X360"), |
| DMI_MATCH(DMI_BOARD_NAME, "X360"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_vendor, |
| /* Asus UL30VT */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_vendor, |
| /* Asus UL30A */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_vendor, |
| /* GIGABYTE GB-BXBT-2807 */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "GB-BXBT-2807"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_vendor, |
| /* Sony VPCEH3U1E */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_vendor, |
| /* Xiaomi Mi Pad 2 */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"), |
| }, |
| }, |
| |
| /* |
| * These models have a working acpi_video backlight control, and using |
| * native backlight causes a regression where backlight does not work |
| * when userspace is not handling brightness key events. Disable |
| * native_backlight on these to fix this: |
| * https://bugzilla.kernel.org/show_bug.cgi?id=81691 |
| */ |
| { |
| .callback = video_detect_force_video, |
| /* ThinkPad T420 */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), |
| DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_video, |
| /* ThinkPad T520 */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), |
| DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_video, |
| /* ThinkPad X201s */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), |
| DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_video, |
| /* ThinkPad X201T */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), |
| DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"), |
| }, |
| }, |
| |
| /* The native backlight controls do not work on some older machines */ |
| { |
| /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */ |
| .callback = video_detect_force_video, |
| /* HP ENVY 15 Notebook */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_video, |
| /* SAMSUNG 870Z5E/880Z5E/680Z5E */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_video, |
| /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), |
| DMI_MATCH(DMI_PRODUCT_NAME, |
| "370R4E/370R4V/370R5E/3570RE/370R5V"), |
| }, |
| }, |
| { |
| /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */ |
| .callback = video_detect_force_video, |
| /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), |
| DMI_MATCH(DMI_PRODUCT_NAME, |
| "3570R/370R/470R/450R/510R/4450RV"), |
| }, |
| }, |
| { |
| /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */ |
| .callback = video_detect_force_video, |
| /* SAMSUNG 670Z5E */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"), |
| }, |
| }, |
| { |
| /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */ |
| .callback = video_detect_force_video, |
| /* SAMSUNG 730U3E/740U3E */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"), |
| }, |
| }, |
| { |
| /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */ |
| .callback = video_detect_force_video, |
| /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), |
| DMI_MATCH(DMI_PRODUCT_NAME, |
| "900X3C/900X3D/900X3E/900X4C/900X4D"), |
| }, |
| }, |
| { |
| /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */ |
| .callback = video_detect_force_video, |
| /* Dell XPS14 L421X */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"), |
| }, |
| }, |
| { |
| /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */ |
| .callback = video_detect_force_video, |
| /* Dell XPS15 L521X */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"), |
| }, |
| }, |
| { |
| /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */ |
| .callback = video_detect_force_video, |
| /* SAMSUNG 530U4E/540U4E */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"), |
| }, |
| }, |
| /* https://bugs.launchpad.net/bugs/1894667 */ |
| { |
| .callback = video_detect_force_video, |
| /* HP 635 Notebook */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"), |
| }, |
| }, |
| |
| /* Non win8 machines which need native backlight nevertheless */ |
| { |
| /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */ |
| .callback = video_detect_force_native, |
| /* Lenovo Ideapad S405 */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), |
| DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"), |
| }, |
| }, |
| { |
| /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */ |
| .callback = video_detect_force_native, |
| /* Lenovo Ideapad Z570 */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "102434U"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_native, |
| /* Lenovo E41-25 */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "81FS"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_native, |
| /* Lenovo E41-45 */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "82BK"), |
| }, |
| }, |
| { |
| /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */ |
| .callback = video_detect_force_native, |
| /* Apple MacBook Pro 12,1 */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_native, |
| /* Dell Inspiron N4010 */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_native, |
| /* Dell Vostro V131 */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), |
| }, |
| }, |
| { |
| /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */ |
| .callback = video_detect_force_native, |
| /* Dell XPS 17 L702X */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_native, |
| /* Dell Precision 7510 */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_native, |
| /* Acer Aspire 5738z */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Acer"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"), |
| DMI_MATCH(DMI_BOARD_NAME, "JV50"), |
| }, |
| }, |
| { |
| /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */ |
| .callback = video_detect_force_native, |
| /* Acer TravelMate 5735Z */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Acer"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"), |
| DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_native, |
| /* ASUSTeK COMPUTER INC. GA401 */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "GA401"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_native, |
| /* ASUSTeK COMPUTER INC. GA502 */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "GA502"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_native, |
| /* ASUSTeK COMPUTER INC. GA503 */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "GA503"), |
| }, |
| }, |
| /* |
| * Clevo NL5xRU and NL5xNU/TUXEDO Aura 15 Gen1 and Gen2 have both a |
| * working native and video interface. However the default detection |
| * mechanism first registers the video interface before unregistering |
| * it again and switching to the native interface during boot. This |
| * results in a dangling SBIOS request for backlight change for some |
| * reason, causing the backlight to switch to ~2% once per boot on the |
| * first power cord connect or disconnect event. Setting the native |
| * interface explicitly circumvents this buggy behaviour, by avoiding |
| * the unregistering process. |
| */ |
| { |
| .callback = video_detect_force_native, |
| .ident = "Clevo NL5xRU", |
| .matches = { |
| DMI_MATCH(DMI_BOARD_NAME, "NL5xRU"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_native, |
| .ident = "Clevo NL5xRU", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"), |
| DMI_MATCH(DMI_BOARD_NAME, "AURA1501"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_native, |
| .ident = "Clevo NL5xRU", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"), |
| DMI_MATCH(DMI_BOARD_NAME, "EDUBOOK1502"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_native, |
| .ident = "Clevo NL5xNU", |
| .matches = { |
| DMI_MATCH(DMI_BOARD_NAME, "NL5xNU"), |
| }, |
| }, |
| /* |
| * The TongFang PF5PU1G, PF4NU1F, PF5NU1G, and PF5LUXG/TUXEDO BA15 Gen10, |
| * Pulse 14/15 Gen1, and Pulse 15 Gen2 have the same problem as the Clevo |
| * NL5xRU and NL5xNU/TUXEDO Aura 15 Gen1 and Gen2. See the description |
| * above. |
| */ |
| { |
| .callback = video_detect_force_native, |
| .ident = "TongFang PF5PU1G", |
| .matches = { |
| DMI_MATCH(DMI_BOARD_NAME, "PF5PU1G"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_native, |
| .ident = "TongFang PF4NU1F", |
| .matches = { |
| DMI_MATCH(DMI_BOARD_NAME, "PF4NU1F"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_native, |
| .ident = "TongFang PF4NU1F", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"), |
| DMI_MATCH(DMI_BOARD_NAME, "PULSE1401"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_native, |
| .ident = "TongFang PF5NU1G", |
| .matches = { |
| DMI_MATCH(DMI_BOARD_NAME, "PF5NU1G"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_native, |
| .ident = "TongFang PF5NU1G", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"), |
| DMI_MATCH(DMI_BOARD_NAME, "PULSE1501"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_native, |
| .ident = "TongFang PF5LUXG", |
| .matches = { |
| DMI_MATCH(DMI_BOARD_NAME, "PF5LUXG"), |
| }, |
| }, |
| /* |
| * Desktops which falsely report a backlight and which our heuristics |
| * for this do not catch. |
| */ |
| { |
| .callback = video_detect_force_none, |
| /* Dell OptiPlex 9020M */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"), |
| }, |
| }, |
| { |
| .callback = video_detect_force_none, |
| /* MSI MS-7721 */ |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "MSI"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"), |
| }, |
| }, |
| { }, |
| }; |
| |
| /* This uses a workqueue to avoid various locking ordering issues */ |
| static void acpi_video_backlight_notify_work(struct work_struct *work) |
| { |
| if (acpi_video_get_backlight_type() != acpi_backlight_video) |
| acpi_video_unregister_backlight(); |
| } |
| |
| static int acpi_video_backlight_notify(struct notifier_block *nb, |
| unsigned long val, void *bd) |
| { |
| struct backlight_device *backlight = bd; |
| |
| /* A raw bl registering may change video -> native */ |
| if (backlight->props.type == BACKLIGHT_RAW && |
| val == BACKLIGHT_REGISTERED) |
| schedule_work(&backlight_notify_work); |
| |
| return NOTIFY_OK; |
| } |
| |
| /* |
| * Determine which type of backlight interface to use on this system, |
| * First check cmdline, then dmi quirks, then do autodetect. |
| * |
| * The autodetect order is: |
| * 1) Is the acpi-video backlight interface supported -> |
| * no, use a vendor interface |
| * 2) Is this a win8 "ready" BIOS and do we have a native interface -> |
| * yes, use a native interface |
| * 3) Else use the acpi-video interface |
| * |
| * Arguably the native on win8 check should be done first, but that would |
| * be a behavior change, which may causes issues. |
| */ |
| enum acpi_backlight_type acpi_video_get_backlight_type(void) |
| { |
| static DEFINE_MUTEX(init_mutex); |
| static bool init_done; |
| static long video_caps; |
| |
| /* Parse cmdline, dmi and acpi only once */ |
| mutex_lock(&init_mutex); |
| if (!init_done) { |
| acpi_video_parse_cmdline(); |
| dmi_check_system(video_detect_dmi_table); |
| acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
| ACPI_UINT32_MAX, find_video, NULL, |
| &video_caps, NULL); |
| INIT_WORK(&backlight_notify_work, |
| acpi_video_backlight_notify_work); |
| backlight_nb.notifier_call = acpi_video_backlight_notify; |
| backlight_nb.priority = 0; |
| if (backlight_register_notifier(&backlight_nb) == 0) |
| backlight_notifier_registered = true; |
| init_done = true; |
| } |
| mutex_unlock(&init_mutex); |
| |
| if (acpi_backlight_cmdline != acpi_backlight_undef) |
| return acpi_backlight_cmdline; |
| |
| if (acpi_backlight_dmi != acpi_backlight_undef) |
| return acpi_backlight_dmi; |
| |
| if (!(video_caps & ACPI_VIDEO_BACKLIGHT)) |
| return acpi_backlight_vendor; |
| |
| if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW)) |
| return acpi_backlight_native; |
| |
| return acpi_backlight_video; |
| } |
| EXPORT_SYMBOL(acpi_video_get_backlight_type); |
| |
| /* |
| * Set the preferred backlight interface type based on DMI info. |
| * This function allows DMI blacklists to be implemented by external |
| * platform drivers instead of putting a big blacklist in video_detect.c |
| */ |
| void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type) |
| { |
| acpi_backlight_dmi = type; |
| /* Remove acpi-video backlight interface if it is no longer desired */ |
| if (acpi_video_get_backlight_type() != acpi_backlight_video) |
| acpi_video_unregister_backlight(); |
| } |
| EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type); |
| |
| void __exit acpi_video_detect_exit(void) |
| { |
| if (backlight_notifier_registered) |
| backlight_unregister_notifier(&backlight_nb); |
| } |