libcamera: camera: Provide a list of ControlInfo

Extend the Camera class to expose the controls it supports. Each
pipeline should generate a list of controls supported by each camera it
creates. These are represented by a ControlInfoMap, and an associated
ControlList of default values.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

src/libcamera/include/pipeline_handler.h

@@ -14,6 +14,7 @@
 #include <string>
 #include <vector>
 
+#include <libcamera/controls.h>
 #include <libcamera/stream.h>
 
 namespace libcamera {
@@ -41,6 +42,7 @@ public:
 	Camera *camera_;
 	PipelineHandler *pipe_;
 	std::list<Request *> queuedRequests_;
+	ControlInfoMap controlInfo_;
 
 private:
 	CameraData(const CameraData &) = delete;
@@ -60,6 +62,8 @@ public:
 	bool lock();
 	void unlock();
 
+	const ControlInfoMap &controls(Camera *camera);
+
 	virtual CameraConfiguration *generateConfiguration(Camera *camera,
 		const StreamRoles &roles) = 0;
 	virtual int configure(Camera *camera, CameraConfiguration *config) = 0;