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diff --git a/src/ipa/raspberrypi/controller/rpi/geq.hpp b/src/ipa/raspberrypi/controller/rpi/geq.hpp
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+++ b/src/ipa/raspberrypi/controller/rpi/geq.hpp
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+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * geq.hpp - GEQ (green equalisation) control algorithm
+ */
+#pragma once
+
+#include "../algorithm.hpp"
+#include "../geq_status.h"
+
+namespace RPi {
+
+// Back End algorithm to apply appropriate GEQ settings.
+
+struct GeqConfig {
+	uint16_t offset;
+	double slope;
+	Pwl strength; // lux to strength factor
+};
+
+class Geq : public Algorithm
+{
+public:
+	Geq(Controller *controller);
+	char const *Name() const override;
+	void Read(boost::property_tree::ptree const &params) override;
+	void Prepare(Metadata *image_metadata) override;
+
+private:
+	GeqConfig config_;
+};
+
+} // namespace RPi