1 files changed, 67 insertions, 0 deletions
diff --git a/src/ipa/raspberrypi/cam_helper_imx290.cpp b/src/ipa/raspberrypi/cam_helper_imx290.cpp
new file mode 100644
index 00000000..6f412e40
--- /dev/null
+++ b/src/ipa/raspberrypi/cam_helper_imx290.cpp
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2021, Raspberry Pi (Trading) Limited
+ *
+ * cam_helper_imx290.cpp - camera helper for imx290 sensor
+ */
+
+#include <math.h>
+
+#include "cam_helper.hpp"
+
+using namespace RPiController;
+
+class CamHelperImx290 : public CamHelper
+{
+public:
+	CamHelperImx290();
+	uint32_t GainCode(double gain) const override;
+	double Gain(uint32_t gain_code) const override;
+	void GetDelays(int &exposure_delay, int &gain_delay,
+		       int &vblank_delay) const override;
+	unsigned int HideFramesModeSwitch() const override;
+
+private:
+	/*
+	 * Smallest difference between the frame length and integration time,
+	 * in units of lines.
+	 */
+	static constexpr int frameIntegrationDiff = 2;
+};
+
+CamHelperImx290::CamHelperImx290()
+	: CamHelper(nullptr, frameIntegrationDiff)
+{
+}
+
+uint32_t CamHelperImx290::GainCode(double gain) const
+{
+	int code = 66.6667 * log10(gain);
+	return std::max(0, std::min(code, 0xf0));
+}
+
+double CamHelperImx290::Gain(uint32_t gain_code) const
+{
+	return pow(10, 0.015 * gain_code);
+}
+
+void CamHelperImx290::GetDelays(int &exposure_delay, int &gain_delay,
+				int &vblank_delay) const
+{
+	exposure_delay = 2;
+	gain_delay = 2;
+	vblank_delay = 2;
+}
+
+unsigned int CamHelperImx290::HideFramesModeSwitch() const
+{
+	/* After a mode switch, we seem to get 1 bad frame. */
+	return 1;
+}
+
+static CamHelper *Create()
+{
+	return new CamHelperImx290();
+}
+
+static RegisterCamHelper reg("imx290", &Create);