libcamera: Add ControlValidator implementation for Camera

Add a new CameraControlValidator class that implements the
ControlValidator interface for a Camera object.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

src/libcamera/include/camera_controls.h

@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * camera_controls.h - Camera controls
+ */
+#ifndef __LIBCAMERA_CAMERA_CONTROLS_H__
+#define __LIBCAMERA_CAMERA_CONTROLS_H__
+
+#include "control_validator.h"
+
+namespace libcamera {
+
+class Camera;
+
+class CameraControlValidator final : public ControlValidator
+{
+public:
+	CameraControlValidator(Camera *camera);
+
+	const std::string &name() const override;
+	bool validate(const ControlId &id) const override;
+
+private:
+	Camera *camera_;
+};
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_CAMERA_CONTROLS_H__ */