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/* SPDX-License-Identifier: BSD-2-Clause */
/*
 * Copyright (C) 2024, Raspberry Pi Ltd
 *
 * cam_helper_Imx283.cpp - camera information for Imx283 sensor
 */

#include <assert.h>

#include "cam_helper.h"
#include "math.h"
using namespace RPiController;

class CamHelperImx283 : public CamHelper
{
public:
	CamHelperImx283();
	uint32_t gainCode(double gain) const override;
	double gain(uint32_t gainCode) const override;
	void getDelays(int &exposureDelay, int &gainDelay,
		       int &vblankDelay, int &hblankDelay) 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 = 4;
};

/*
 * Imx283 doesn't output metadata, so we have to use the delayed controls which
 * works by counting frames.
 */

CamHelperImx283::CamHelperImx283()
	: CamHelper({}, frameIntegrationDiff)
{
}

uint32_t CamHelperImx283::gainCode(double gain) const
{
	return static_cast<uint32_t>(2048.0 - 2048.0 / gain);
}

double CamHelperImx283::gain(uint32_t gainCode) const
{
	return static_cast<double>(2048.0 / (2048 - gainCode));
}

void CamHelperImx283::getDelays(int &exposureDelay, int &gainDelay,
				int &vblankDelay, int &hblankDelay) const
{
	/* The driver appears to behave as follows: */
	exposureDelay = 2;
	gainDelay = 2;
	vblankDelay = 2;
	hblankDelay = 2;
}

unsigned int CamHelperImx283::hideFramesModeSwitch() const
{
	/* After a mode switch, we seem to get 1 bad frame. */
	return 1;
}

static CamHelper *create()
{
	return new CamHelperImx283();
}

static RegisterCamHelper reg("imx283", &create);