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authorHans de Goede <hdegoede@redhat.com>2022-06-04 15:06:18 +0300
committerHans de Goede <hdegoede@redhat.com>2022-09-03 13:17:26 +0300
commitfe7aebb40d42bf8e830019d6f57c47cf7d85aa61 (patch)
tree26a48928686e3d2b15924992dd7ab70732b39c08 /drivers/acpi/video_detect.c
parentb39be9f441f9d7320e6020bdf8ec1522d6c81d1e (diff)
downloadlinux-fe7aebb40d42bf8e830019d6f57c47cf7d85aa61.tar.xz
ACPI: video: Add Nvidia WMI EC brightness control detection (v3)
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>
Diffstat (limited to 'drivers/acpi/video_detect.c')
-rw-r--r--drivers/acpi/video_detect.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index cc9d0d91e268..4dc7fb865083 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -32,6 +32,7 @@
#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/pci.h>
+#include <linux/platform_data/x86/nvidia-wmi-ec-backlight.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#include <acpi/video.h>
@@ -75,6 +76,36 @@ find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
return AE_OK;
}
+/* This depends on ACPI_WMI which is X86 only */
+#ifdef CONFIG_X86
+static bool nvidia_wmi_ec_supported(void)
+{
+ struct wmi_brightness_args args = {
+ .mode = WMI_BRIGHTNESS_MODE_GET,
+ .val = 0,
+ .ret = 0,
+ };
+ struct acpi_buffer buf = { (acpi_size)sizeof(args), &args };
+ acpi_status status;
+
+ status = wmi_evaluate_method(WMI_BRIGHTNESS_GUID, 0,
+ WMI_BRIGHTNESS_METHOD_SOURCE, &buf, &buf);
+ if (ACPI_FAILURE(status))
+ return false;
+
+ /*
+ * If brightness is handled by the EC then nvidia-wmi-ec-backlight
+ * should be used, else the GPU driver(s) should be used.
+ */
+ return args.ret == WMI_BRIGHTNESS_SOURCE_EC;
+}
+#else
+static bool nvidia_wmi_ec_supported(void)
+{
+ return false;
+}
+#endif
+
/* Force to use vendor driver when the ACPI device is known to be
* buggy */
static int video_detect_force_vendor(const struct dmi_system_id *d)
@@ -541,6 +572,7 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
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;
@@ -553,6 +585,7 @@ static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
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)
@@ -570,6 +603,10 @@ static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
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) {
/*