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diff --git a/src/ipa/libipa/camera_sensor_helper.h b/src/ipa/libipa/camera_sensor_helper.h
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+++ b/src/ipa/libipa/camera_sensor_helper.h
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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021, Google Inc.
+ *
+ * camera_sensor_helper.h - Helper class that performs sensor-specific parameter computations
+ */
+#ifndef __LIBCAMERA_IPA_LIBIPA_CAMERA_SENSOR_HELPER_H__
+#define __LIBCAMERA_IPA_LIBIPA_CAMERA_SENSOR_HELPER_H__
+
+#include <stdint.h>
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include <libcamera/base/class.h>
+
+namespace libcamera {
+
+namespace ipa {
+
+class CameraSensorHelper
+{
+public:
+	CameraSensorHelper() = default;
+	virtual ~CameraSensorHelper() = default;
+
+	virtual uint32_t gainCode(double gain) const;
+	virtual double gain(uint32_t gainCode) const;
+
+protected:
+	enum AnalogueGainType {
+		AnalogueGainLinear = 0,
+		AnalogueGainExponential = 2,
+	};
+
+	struct AnalogueGainConstants {
+		AnalogueGainType type;
+		int16_t m0;
+		int16_t c0;
+		int16_t m1;
+		int16_t c1;
+	};
+
+	AnalogueGainConstants analogueGainConstants_;
+
+private:
+	LIBCAMERA_DISABLE_COPY_AND_MOVE(CameraSensorHelper)
+};
+
+class CameraSensorHelperFactory
+{
+public:
+	CameraSensorHelperFactory(const std::string name);
+	virtual ~CameraSensorHelperFactory() = default;
+
+	static std::unique_ptr<CameraSensorHelper> create(const std::string &name);
+
+	static void registerType(CameraSensorHelperFactory *factory);
+	static std::vector<CameraSensorHelperFactory *> &factories();
+
+protected:
+	LIBCAMERA_DISABLE_COPY_AND_MOVE(CameraSensorHelperFactory)
+	virtual CameraSensorHelper *createInstance() = 0;
+
+	std::string name_;
+};
+
+#define REGISTER_CAMERA_SENSOR_HELPER(name, helper)		  \
+class helper##Factory final : public CameraSensorHelperFactory	  \
+{                                                                 \
+public:                                                           \
+	helper##Factory() : CameraSensorHelperFactory(name) {}	  \
+								  \
+private:                                                          \
+	CameraSensorHelper *createInstance()			  \
+	{							  \
+		return new helper();				  \
+	}							  \
+};								  \
+static helper##Factory global_##helper##Factory;
+
+} /* namespace ipa */
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_IPA_LIBIPA_CAMERA_SENSOR_HELPER_H__ */