libcamera: camera_lens: add CameraLens as a member of CameraSensor

Add CameraLens as a member of CameraSensor. The patch does not implement how
to link the lens to the specific sensor yet. Only to provide an interface for
pipeline handler's usage.

Signed-off-by: Han-Lin Chen <hanlinchen@chromium.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/internal/camera_sensor.h

@@ -24,6 +24,7 @@
 namespace libcamera {
 
 class BayerFormat;
+class CameraLens;
 class MediaEntity;
 
 class CameraSensor : protected Loggable
@@ -60,6 +61,8 @@ public:
 
 	void updateControlInfo();
 
+	CameraLens *focusLens() { return focusLens_.get(); }
+
 protected:
 	std::string logPrefix() const override;
 
@@ -91,6 +94,8 @@ private:
 	const BayerFormat *bayerFormat_;
 
 	ControlList properties_;
+
+	std::unique_ptr<CameraLens> focusLens_;
 };
 
 } /* namespace libcamera */

src/libcamera/camera_sensor.cpp

@@ -20,6 +20,7 @@
 #include <libcamera/base/utils.h>
 
 #include "libcamera/internal/bayer_format.h"
+#include "libcamera/internal/camera_lens.h"
 #include "libcamera/internal/camera_sensor_properties.h"
 #include "libcamera/internal/formats.h"
 #include "libcamera/internal/sysfs.h"
@@ -787,6 +788,14 @@ void CameraSensor::updateControlInfo()
 	subdev_->updateControlInfo();
 }
 
+/**
+ * \fn CameraSensor::focusLens_()
+ * \brief Retrieve the focus lens controller
+ *
+ * \return The focus lens controller. nullptr if no focus lens controller is
+ * connected to the sensor
+ */
+
 std::string CameraSensor::logPrefix() const
 {
 	return "'" + entity_->name() + "'";