libcamera: camera_sensor: Introduce CameraSensorFactory

Introduce a factory to create CameraSensor derived classes instances by
inspecting the sensor media entity name and provide a convenience macro
to register specialized sensor handlers.

Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/pipeline/simple/simple.cpp

@@ -388,8 +388,6 @@ SimpleCameraData::SimpleCameraData(SimplePipelineHandler *pipe,
 				   MediaEntity *sensor)
 	: Camera::Private(pipe), streams_(numStreams)
 {
-	int ret;
-
 	/*
 	 * Find the shortest path from the camera sensor to a video capture
 	 * device using the breadth-first search algorithm. This heuristic will
@@ -480,12 +478,9 @@ SimpleCameraData::SimpleCameraData(SimplePipelineHandler *pipe,
 	}
 
 	/* Finally also remember the sensor. */
-	sensor_ = std::make_unique<CameraSensor>(sensor);
-	ret = sensor_->init();
-	if (ret) {
-		sensor_.reset();
+	sensor_ = CameraSensorFactoryBase::create(sensor);
+	if (!sensor_)
 		return;
-	}
 
 	LOG(SimplePipeline, Debug)
 		<< "Found pipeline: "