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