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/* * 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. RAW/GPU-driver backlight drivers must * use the acpi_video_backlight_use_native() helper for this. * * 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. */ static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native) { static DEFINE_MUTEX(init_mutex); static bool native_available; 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; } if (native) native_available = 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() && native_available) return acpi_backlight_native; return acpi_backlight_video; } enum acpi_backlight_type acpi_video_get_backlight_type(void) { return __acpi_video_get_backlight_type(false); } EXPORT_SYMBOL(acpi_video_get_backlight_type); bool acpi_video_backlight_use_native(void) { return __acpi_video_get_backlight_type(true) == acpi_backlight_native; } EXPORT_SYMBOL(acpi_video_backlight_use_native); /* * 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); }
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