#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>
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)
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;
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)
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) {
/*