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ACPI: video: Add Apple GMUX brightness control detection 

On Apple laptops with an Apple GMUX using this for brightness control,
should take precedence of any other brightness control methods.

Add apple-gmux detection to acpi_video_get_backlight_type() using
the already existing apple_gmux_present() helper function.

This will allow removig the (ab)use of:

	acpi_video_set_dmi_backlight_type(acpi_backlight_vendor);

Inside the apple-gmux driver.

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Hans de Goede 2022-06-04 15:21:51 +02:00
parent fe7aebb40d
commit 21245df307
2 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/acpi/video_detect.c
View File

@ -28,6 +28,7 @@
#include <linux/export.h>
#include <linux/acpi.h>
#include <linux/apple-gmux.h>
#include <linux/backlight.h>
#include <linux/dmi.h>
#include <linux/module.h>
@ -607,6 +608,9 @@ static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
if (nvidia_wmi_ec_present)
return acpi_backlight_nvidia_wmi_ec;
if (apple_gmux_present())
return acpi_backlight_apple_gmux;
/* On systems with ACPI video use either native or ACPI video. */
if (video_caps & ACPI_VIDEO_BACKLIGHT) {
/*

1
include/acpi/video.h
View File

@ -49,6 +49,7 @@ enum acpi_backlight_type {
acpi_backlight_vendor,
acpi_backlight_native,
acpi_backlight_nvidia_wmi_ec,
acpi_backlight_apple_gmux,
};
#if IS_ENABLED(CONFIG_ACPI_VIDEO)