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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2019, Raspberry Pi (Trading) Limited
*
* cam_helper_imx219.cpp - camera helper for imx219 sensor
*/
#include <assert.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
/*
* We have observed that the imx219 embedded data stream randomly returns junk
* register values. Do not rely on embedded data until this has been resolved.
*/
#define ENABLE_EMBEDDED_DATA 0
#include "cam_helper.hpp"
#if ENABLE_EMBEDDED_DATA
#include "md_parser.hpp"
#endif
using namespace RPiController;
/* Metadata parser implementation specific to Sony IMX219 sensors. */
class MdParserImx219 : public MdParserSmia
{
public:
MdParserImx219();
Status Parse(libcamera::Span<const uint8_t> buffer) override;
Status GetExposureLines(unsigned int &lines) override;
Status GetGainCode(unsigned int &gain_code) override;
private:
/* Offset of the register's value in the metadata block. */
int reg_offsets_[3];
/* Value of the register, once read from the metadata block. */
int reg_values_[3];
};
class CamHelperImx219 : public CamHelper
{
public:
CamHelperImx219();
uint32_t GainCode(double gain) const override;
double Gain(uint32_t gain_code) const override;
unsigned int MistrustFramesModeSwitch() const override;
bool SensorEmbeddedDataPresent() const override;
private:
/*
* Smallest difference between the frame length and integration time,
* in units of lines.
*/
static constexpr int frameIntegrationDiff = 4;
};
CamHelperImx219::CamHelperImx219()
#if ENABLE_EMBEDDED_DATA
: CamHelper(std::make_unique<MdParserImx219>(), frameIntegrationDiff)
#else
: CamHelper({}, frameIntegrationDiff)
#endif
{
}
uint32_t CamHelperImx219::GainCode(double gain) const
{
return (uint32_t)(256 - 256 / gain);
}
double CamHelperImx219::Gain(uint32_t gain_code) const
{
return 256.0 / (256 - gain_code);
}
unsigned int CamHelperImx219::MistrustFramesModeSwitch() const
{
/*
* For reasons unknown, we do occasionally get a bogus metadata frame
* at a mode switch (though not at start-up). Possibly warrants some
* investigation, though not a big deal.
*/
return 1;
}
bool CamHelperImx219::SensorEmbeddedDataPresent() const
{
return ENABLE_EMBEDDED_DATA;
}
static CamHelper *Create()
{
return new CamHelperImx219();
}
static RegisterCamHelper reg("imx219", &Create);
/*
* We care about one gain register and a pair of exposure registers. Their I2C
* addresses from the Sony IMX219 datasheet:
*/
#define GAIN_REG 0x157
#define EXPHI_REG 0x15A
#define EXPLO_REG 0x15B
/*
* Index of each into the reg_offsets and reg_values arrays. Must be in
* register address order.
*/
#define GAIN_INDEX 0
#define EXPHI_INDEX 1
#define EXPLO_INDEX 2
MdParserImx219::MdParserImx219()
{
reg_offsets_[0] = reg_offsets_[1] = reg_offsets_[2] = -1;
}
MdParser::Status MdParserImx219::Parse(libcamera::Span<const uint8_t> buffer)
{
bool try_again = false;
if (reset_) {
/*
* Search again through the metadata for the gain and exposure
* registers.
*/
assert(bits_per_pixel_);
/* Need to be ordered */
uint32_t regs[3] = { GAIN_REG, EXPHI_REG, EXPLO_REG };
reg_offsets_[0] = reg_offsets_[1] = reg_offsets_[2] = -1;
int ret = static_cast<int>(findRegs(buffer,
regs, reg_offsets_, 3));
/*
* > 0 means "worked partially but parse again next time",
* < 0 means "hard error".
*/
if (ret > 0)
try_again = true;
else if (ret < 0)
return ERROR;
}
for (int i = 0; i < 3; i++) {
if (reg_offsets_[i] == -1)
continue;
reg_values_[i] = buffer[reg_offsets_[i]];
}
/* Re-parse next time if we were unhappy in some way. */
reset_ = try_again;
return OK;
}
MdParser::Status MdParserImx219::GetExposureLines(unsigned int &lines)
{
if (reg_offsets_[EXPHI_INDEX] == -1 || reg_offsets_[EXPLO_INDEX] == -1)
return NOTFOUND;
lines = reg_values_[EXPHI_INDEX] * 256 + reg_values_[EXPLO_INDEX];
return OK;
}
MdParser::Status MdParserImx219::GetGainCode(unsigned int &gain_code)
{
if (reg_offsets_[GAIN_INDEX] == -1)
return NOTFOUND;
gain_code = reg_values_[GAIN_INDEX];
return OK;
}
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