422 lines
12 KiB
C
422 lines
12 KiB
C
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/*
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* Copyright (C) 2015 Red Hat Inc.
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* Hans de Goede <hdegoede@redhat.com>
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* Copyright (C) 2008 SuSE Linux Products GmbH
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* Thomas Renninger <trenn@suse.de>
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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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#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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ACPI_MODULE_NAME("video");
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#define _COMPONENT ACPI_VIDEO_COMPONENT
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void acpi_video_unregister_backlight(void);
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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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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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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 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) untill 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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* 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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/* 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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};
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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 &&
|
||
|
|
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);
|
||
|
|
}
|