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diff --git a/src/ipa/raspberrypi/controller/controller.hpp b/src/ipa/raspberrypi/controller/controller.hpp
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+++ b/src/ipa/raspberrypi/controller/controller.hpp
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+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * controller.hpp - ISP controller interface
+ */
+#pragma once
+
+// The Controller is simply a container for a collecting together a number of
+// "control algorithms" (such as AWB etc.) and for running them all in a
+// convenient manner.
+
+#include <vector>
+#include <string>
+
+#include <linux/bcm2835-isp.h>
+
+#include "camera_mode.h"
+#include "device_status.h"
+#include "metadata.hpp"
+
+namespace RPi {
+
+class Algorithm;
+typedef std::unique_ptr<Algorithm> AlgorithmPtr;
+typedef std::shared_ptr<bcm2835_isp_stats> StatisticsPtr;
+
+// The Controller holds a pointer to some global_metadata, which is how
+// different controllers and control algorithms within them can exchange
+// information. The Prepare method returns a pointer to metadata for this
+// specific image, and which should be passed on to the Process method.
+
+class Controller
+{
+public:
+	Controller();
+	Controller(char const *json_filename);
+	~Controller();
+	Algorithm *CreateAlgorithm(char const *name);
+	void Read(char const *filename);
+	void Initialise();
+	void SwitchMode(CameraMode const &camera_mode);
+	void Prepare(Metadata *image_metadata);
+	void Process(StatisticsPtr stats, Metadata *image_metadata);
+	Metadata &GetGlobalMetadata();
+	Algorithm *GetAlgorithm(std::string const &name) const;
+
+protected:
+	Metadata global_metadata_;
+	std::vector<AlgorithmPtr> algorithms_;
+	bool switch_mode_called_;
+};
+
+} // namespace RPi