[PATCH 3/3] ACPI: video: Fix apple gmux detection

[Hans de Goede <hdegoede@redhat.com>]

Some apple laptop models have an ACPI device with a HID of APP000B
and that device has an IO resource (so it does not describe the new
unsupported MMIO based gmux type), but there actually is no gmux
in the laptop at all.

The gmux_probe() function of the actual apple-gmux driver has code
to detect this, this code has been factored out into a new
apple_gmux_detect() helper in apple-gmux.h.

Use this new function to fix acpi_video_get_backlight_type() wrongly
returning apple_gmux as type on these new laptops.

Fixes: 21245df307cb ("ACPI: video: Add Apple GMUX brightness control detection")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/acpi/video_detect.c | 24 +++---------------------
 1 file changed, 3 insertions(+), 21 deletions(-)

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 64eab35037c3..a8c02608dde4 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -110,26 +110,6 @@ static bool nvidia_wmi_ec_supported(void)
 }
 #endif
 
-static bool apple_gmux_backlight_present(void)
-{
-	struct acpi_device *adev;
-	struct device *dev;
-
-	adev = acpi_dev_get_first_match_dev(GMUX_ACPI_HID, NULL, -1);
-	if (!adev)
-		return false;
-
-	dev = acpi_get_first_physical_node(adev);
-	if (!dev)
-		return false;
-
-	/*
-	 * drivers/platform/x86/apple-gmux.c only supports old style
-	 * Apple GMUX with an IO-resource.
-	 */
-	return pnp_get_resource(to_pnp_dev(dev), IORESOURCE_IO, 0) != NULL;
-}
-
 /* 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)
@@ -791,6 +771,7 @@ 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 apple_gmux_present;
 	static bool native_available;
 	static bool init_done;
 	static long video_caps;
@@ -804,6 +785,7 @@ static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
 				    ACPI_UINT32_MAX, find_video, NULL,
 				    &video_caps, NULL);
 		nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
+		apple_gmux_present = apple_gmux_detect(NULL, NULL);
 		init_done = true;
 	}
 	if (native)
@@ -825,7 +807,7 @@ 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_backlight_present())
+	if (apple_gmux_present)
 		return acpi_backlight_apple_gmux;
 
 	/* Use ACPI video if available, except when native should be preferred. */
-- 
2.39.0