libcamera: ipu3: Add method to retrieve camera data

Provide a method for the IPU3 pipeline handler that hides the downcast
required to return an "IPU3CameraData *" reference from the
PipelineHandler::cameraData() method.

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

src/libcamera/pipeline/ipu3/ipu3.cpp

@@ -42,6 +42,12 @@ private:
 	std::shared_ptr<MediaDevice> cio2_;
 	std::shared_ptr<MediaDevice> imgu_;
 
+	IPU3CameraData *cameraData(const Camera *camera)
+	{
+		return static_cast<IPU3CameraData *>(
+			PipelineHandler::cameraData(camera));
+	}
+
 	V4L2Device *createVideoDevice(unsigned int id);
 	void registerCameras();
 };