fe7aebb40d
On some new laptop designs a new Nvidia specific WMI interface is present which gives info about panel brightness control and may allow controlling the brightness through this interface when the embedded controller is used for brightness control. When this WMI interface is present and indicates that the EC is used, then this interface should be used for brightness control. Changes in v2: - Use the new shared nvidia-wmi-ec-backlight.h header for the WMI firmware API definitions - ACPI_VIDEO can now be enabled on non X86 too, adjust the Kconfig changes to match this. Changes in v3: - Use WMI_BRIGHTNESS_GUID define Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Daniel Dadap <ddadap@nvidia.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
656 lines
18 KiB
C
656 lines
18 KiB
C
/*
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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 which
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* driver should handle the backlight. RAW/GPU-driver backlight drivers must
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* use the acpi_video_backlight_use_native() helper for this.
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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/platform_data/x86/nvidia-wmi-ec-backlight.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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void acpi_video_unregister_backlight(void);
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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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struct acpi_device *acpi_dev = acpi_fetch_acpi_dev(handle);
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long *cap = context;
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struct pci_dev *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_dev && !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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/* This depends on ACPI_WMI which is X86 only */
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#ifdef CONFIG_X86
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static bool nvidia_wmi_ec_supported(void)
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{
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struct wmi_brightness_args args = {
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.mode = WMI_BRIGHTNESS_MODE_GET,
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.val = 0,
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.ret = 0,
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};
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struct acpi_buffer buf = { (acpi_size)sizeof(args), &args };
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acpi_status status;
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status = wmi_evaluate_method(WMI_BRIGHTNESS_GUID, 0,
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WMI_BRIGHTNESS_METHOD_SOURCE, &buf, &buf);
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if (ACPI_FAILURE(status))
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return false;
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/*
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* If brightness is handled by the EC then nvidia-wmi-ec-backlight
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* should be used, else the GPU driver(s) should be used.
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*/
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return args.ret == WMI_BRIGHTNESS_SOURCE_EC;
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}
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#else
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static bool nvidia_wmi_ec_supported(void)
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{
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return false;
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}
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#endif
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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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/* 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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/* 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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/* 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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/* 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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/* 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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.callback = video_detect_force_vendor,
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/* Xiaomi Mi Pad 2 */
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
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DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
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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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* Dell Inspiron N4010 */
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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, "Inspiron N4010"),
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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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/* 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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/* 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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/* 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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/* 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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/* 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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.callback = video_detect_force_native,
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/* ASUSTeK COMPUTER INC. GA401 */
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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, "GA401"),
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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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/* ASUSTeK COMPUTER INC. GA502 */
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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, "GA502"),
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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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/* ASUSTeK COMPUTER INC. GA503 */
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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, "GA503"),
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},
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},
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/*
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* 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"),
|
|
},
|
|
},
|
|
{ },
|
|
};
|
|
|
|
/*
|
|
* Determine which type of backlight interface to use on this system,
|
|
* First check cmdline, then dmi quirks, then do autodetect.
|
|
*/
|
|
static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
|
|
{
|
|
static DEFINE_MUTEX(init_mutex);
|
|
static bool nvidia_wmi_ec_present;
|
|
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);
|
|
nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
|
|
init_done = true;
|
|
}
|
|
if (native)
|
|
native_available = true;
|
|
mutex_unlock(&init_mutex);
|
|
|
|
/*
|
|
* The below heuristics / detection steps are in order of descending
|
|
* presedence. The commandline takes presedence over anything else.
|
|
*/
|
|
if (acpi_backlight_cmdline != acpi_backlight_undef)
|
|
return acpi_backlight_cmdline;
|
|
|
|
/* DMI quirks override any autodetection. */
|
|
if (acpi_backlight_dmi != acpi_backlight_undef)
|
|
return acpi_backlight_dmi;
|
|
|
|
/* Special cases such as nvidia_wmi_ec and apple gmux. */
|
|
if (nvidia_wmi_ec_present)
|
|
return acpi_backlight_nvidia_wmi_ec;
|
|
|
|
/* On systems with ACPI video use either native or ACPI video. */
|
|
if (video_caps & ACPI_VIDEO_BACKLIGHT) {
|
|
/*
|
|
* Windows 8 and newer no longer use the ACPI video interface,
|
|
* so it often does not work. If the ACPI tables are written
|
|
* for win8 and native brightness ctl is available, use that.
|
|
*
|
|
* The native check deliberately is inside the if acpi-video
|
|
* block on older devices without acpi-video support native
|
|
* is usually not the best choice.
|
|
*/
|
|
if (acpi_osi_is_win8() && native_available)
|
|
return acpi_backlight_native;
|
|
else
|
|
return acpi_backlight_video;
|
|
}
|
|
|
|
/* No ACPI video (old hw), use vendor specific fw methods. */
|
|
return acpi_backlight_vendor;
|
|
}
|
|
|
|
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);
|