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diff --git a/src/ipa/rpi/controller/controller.h b/src/ipa/rpi/controller/controller.h
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+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi Ltd
+ *
+ * controller.h - 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 <libcamera/base/utils.h>
+#include "libcamera/internal/yaml_parser.h"
+
+#include "camera_mode.h"
+#include "device_status.h"
+#include "metadata.h"
+#include "statistics.h"
+
+namespace RPiController {
+
+class Algorithm;
+typedef std::unique_ptr<Algorithm> AlgorithmPtr;
+
+/*
+ * The Controller holds a pointer to some global_metadata, which is how
+ * different controllers and control algorithms within them can exchange
+ * information. The Prepare function returns a pointer to metadata for this
+ * specific image, and which should be passed on to the Process function.
+ */
+
+class Controller
+{
+public:
+	struct HardwareConfig {
+		libcamera::Size agcRegions;
+		libcamera::Size agcZoneWeights;
+		libcamera::Size awbRegions;
+		libcamera::Size cacRegions;
+		libcamera::Size focusRegions;
+		unsigned int numHistogramBins;
+		unsigned int numGammaPoints;
+		unsigned int pipelineWidth;
+		bool statsInline;
+		libcamera::utils::Duration minPixelProcessingTime;
+	};
+
+	Controller();
+	~Controller();
+	int read(char const *filename);
+	void initialise();
+	void switchMode(CameraMode const &cameraMode, Metadata *metadata);
+	void prepare(Metadata *imageMetadata);
+	void process(StatisticsPtr stats, Metadata *imageMetadata);
+	Metadata &getGlobalMetadata();
+	Algorithm *getAlgorithm(std::string const &name) const;
+	const std::string &getTarget() const;
+	const HardwareConfig &getHardwareConfig() const;
+
+protected:
+	int createAlgorithm(const std::string &name, const libcamera::YamlObject &params);
+
+	Metadata globalMetadata_;
+	std::vector<AlgorithmPtr> algorithms_;
+	bool switchModeCalled_;
+
+private:
+	std::string target_;
+};
+
+} /* namespace RPiController */