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diff --git a/src/ipa/raspberrypi/controller/rpi/geq.h b/src/ipa/raspberrypi/controller/rpi/geq.h
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+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * geq.h - GEQ (green equalisation) control algorithm
+ */
+#pragma once
+
+#include "../algorithm.h"
+#include "../geq_status.h"
+
+namespace RPiController {
+
+/* 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 *imageMetadata) override;
+
+private:
+ GeqConfig config_;
+};
+
+} /* namespace RPiController */