libcamera: v4l2_subdevice: Change V4L2Subdevice::Whence

The V4L2Subdevice::Whence enumerations defines two values that should
correspond to the V4L2_SUBDEV_FORMAT_ACTIVE and V4L2_SUBDEV_FORMAT_TRY
definitions.

The V4L2 symbols are defined as:

	V4L2_SUBDEV_FORMAT_TRY = 0,
	V4L2_SUBDEV_FORMAT_ACTIVE = 1,

While the libcamera defined enumeration is:

	enum Whence {
		ActiveFormat,
		TryFormat,
	}

As V4L2Subdevice::Whence values are used to populate data types
defined in v4l2-subdev.h used as arguments to VIDIOC_SUBDEV_*
ioctls, the V4L2Subdevice class is required to adjust their value as:

       subdevFmt.which = whence == ActiveFormat ? V4L2_SUBDEV_FORMAT_ACTIVE
                       : V4L2_SUBDEV_FORMAT_TRY;

Drop the adjustment by defining :

	Whence::TryFormat = V4L2_SUBDEV_FORMAT_TRY;
	Whence::ActiveFormat = V4L2_SUBDEV_FORMAT_ACTIVE;

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/include/libcamera/internal/v4l2_subdevice.h b/include/libcamera/internal/v4l2_subdevice.h
index 6fda52ad..2db392d5 100644
--- a/include/libcamera/internal/v4l2_subdevice.h
+++ b/include/libcamera/internal/v4l2_subdevice.h
@@ -13,6 +13,8 @@
 #include <string>
 #include <vector>
 
+#include <linux/v4l2-subdev.h>
+
 #include <libcamera/base/class.h>
 #include <libcamera/base/log.h>
 
@@ -44,8 +46,8 @@ public:
 	using Formats = std::map<unsigned int, std::vector<SizeRange>>;
 
 	enum Whence {
-		ActiveFormat,
-		TryFormat,
+		TryFormat = V4L2_SUBDEV_FORMAT_TRY,
+		ActiveFormat = V4L2_SUBDEV_FORMAT_ACTIVE,
 	};
 
 	explicit V4L2Subdevice(const MediaEntity *entity);