libcamera: camera_sensor: Add model() function

Add a new model() function to the CameraSensor class to report the
camera sensor model.

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

src/libcamera/include/camera_sensor.h

@@ -33,6 +33,7 @@ public:
 
 	int init();
 
+	const std::string &model() const { return model_; }
 	const MediaEntity *entity() const { return entity_; }
 	const std::vector<unsigned int> &mbusCodes() const { return mbusCodes_; }
 	const std::vector<Size> &sizes() const { return sizes_; }
@@ -54,6 +55,7 @@ protected:
 private:
 	const MediaEntity *entity_;
 	V4L2Subdevice *subdev_;
+	std::string model_;
 
 	std::vector<unsigned int> mbusCodes_;
 	std::vector<Size> sizes_;