/* SPDX-License-Identifier: BSD-2-Clause */ /* * Copyright (C) 2020, Raspberry Pi (Trading) Limited * * cam_helper_imx477.cpp - camera helper for imx477 sensor */ #include #include #include #include #include #include #include "cam_helper.hpp" #include "md_parser.hpp" using namespace RPiController; using namespace libcamera; using libcamera::utils::Duration; namespace libcamera { LOG_DECLARE_CATEGORY(IPARPI) } /* * We care about two gain registers and a pair of exposure registers. Their * I2C addresses from the Sony IMX477 datasheet: */ constexpr uint32_t expHiReg = 0x0202; constexpr uint32_t expLoReg = 0x0203; constexpr uint32_t gainHiReg = 0x0204; constexpr uint32_t gainLoReg = 0x0205; constexpr uint32_t frameLengthHiReg = 0x0340; constexpr uint32_t frameLengthLoReg = 0x0341; constexpr std::initializer_list registerList = { expHiReg, expLoReg, gainHiReg, gainLoReg, frameLengthHiReg, frameLengthLoReg }; class CamHelperImx477 : public CamHelper { public: CamHelperImx477(); uint32_t GainCode(double gain) const override; double Gain(uint32_t gain_code) const override; void Prepare(libcamera::Span buffer, Metadata &metadata) override; uint32_t GetVBlanking(Duration &exposure, Duration minFrameDuration, Duration maxFrameDuration) const override; void GetDelays(int &exposure_delay, int &gain_delay, int &vblank_delay) const override; bool SensorEmbeddedDataPresent() const override; private: /* * Smallest difference between the frame length and integration time, * in units of lines. */ static constexpr int frameIntegrationDiff = 22; /* Maximum frame length allowable for long exposure calculations. */ static constexpr int frameLengthMax = 0xffdc; /* Largest long exposure scale factor given as a left shift on the frame length. */ static constexpr int longExposureShiftMax = 7; void PopulateMetadata(const MdParser::RegisterMap ®isters, Metadata &metadata) const override; }; CamHelperImx477::CamHelperImx477() : CamHelper(std::make_unique(registerList), frameIntegrationDiff) { } uint32_t CamHelperImx477::GainCode(double gain) const { return static_cast(1024 - 1024 / gain); } double CamHelperImx477::Gain(uint32_t gain_code) const { return 1024.0 / (1024 - gain_code); } void CamHelperImx477::Prepare(libcamera::Span buffer, Metadata &metadata) { MdParser::RegisterMap registers; DeviceStatus deviceStatus; if (metadata.Get("device.status", deviceStatus)) { LOG(IPARPI, Error) << "DeviceStatus not found from DelayedControls"; return; } parseEmbeddedData(buffer, metadata); /* * The DeviceStatus struct is first populated with values obtained from * DelayedControls. If this reports frame length is > frameLengthMax, * it means we are using a long exposure mode. Since the long exposure * scale factor is not returned back through embedded data, we must rely * on the existing exposure lines and frame length values returned by * DelayedControls. * * Otherwise, all values are updated with what is reported in the * embedded data. */ if (deviceStatus.frame_length > frameLengthMax) { DeviceStatus parsedDeviceStatus; metadata.Get("device.status", parsedDeviceStatus); parsedDeviceStatus.shutter_speed = deviceStatus.shutter_speed; parsedDeviceStatus.frame_length = deviceStatus.frame_length; metadata.Set("device.status", parsedDeviceStatus); LOG(IPARPI, Debug) << "Metadata updated for long exposure: " << parsedDeviceStatus; } } uint32_t CamHelperImx477::GetVBlanking(Duration &exposure, Duration minFrameDuration, Duration maxFrameDuration) const { uint32_t frameLength, exposureLines; unsigned int shift = 0; frameLength = mode_.height + CamHelper::GetVBlanking(exposure, minFrameDuration, maxFrameDuration); /* * Check if the frame length calculated needs to be setup for long * exposure mode. This will require us to use a long exposure scale * factor provided by a shift operation in the sensor. */ while (frameLength > frameLengthMax) { if (++shift > longExposureShiftMax) { shift = longExposureShiftMax; frameLength = frameLengthMax; break; } frameLength >>= 1; } if (shift) { /* Account for any rounding in the scaled frame length value. */ frameLength <<= shift; exposureLines = ExposureLines(exposure); exposureLines = std::min(exposureLines, frameLength - frameIntegrationDiff); exposure = Exposure(exposureLines); } return frameLength - mode_.height; } void CamHelperImx477::GetDelays(int &exposure_delay, int &gain_delay, int &vblank_delay) const { exposure_delay = 2; gain_delay = 2; vblank_delay = 3; } bool CamHelperImx477::SensorEmbeddedDataPresent() const { return true; } void CamHelperImx477::PopulateMetadata(const MdParser::RegisterMap ®isters, Metadata &metadata) const { DeviceStatus deviceStatus; deviceStatus.shutter_speed = Exposure(registers.at(expHiReg) * 256 + registers.at(expLoReg)); deviceStatus.analogue_gain = Gain(registers.at(gainHiReg) * 256 + registers.at(gainLoReg)); deviceStatus.frame_length = registers.at(frameLengthHiReg) * 256 + registers.at(frameLengthLoReg); metadata.Set("device.status", deviceStatus); } static CamHelper *Create() { return new CamHelperImx477(); } static RegisterCamHelper reg("imx477", &Create); id='n54' href='#n54'>54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243

/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2021, Google Inc.
 *
 * mapped_framebuffer.cpp - Mapped Framebuffer support
 */

#include "libcamera/internal/mapped_framebuffer.h"

#include <algorithm>
#include <errno.h>
#include <map>
#include <sys/mman.h>
#include <unistd.h>

#include <libcamera/base/log.h>

/**
 * \file libcamera/internal/mapped_framebuffer.h
 * \brief Frame buffer memory mapping support
 */

namespace libcamera {

LOG_DECLARE_CATEGORY(Buffer)

/**
 * \class MappedBuffer
 * \brief Provide an interface to support managing memory mapped buffers
 *
 * The MappedBuffer interface provides access to a set of MappedPlanes which
 * are available for access by the CPU.
 *
 * This class is not meant to be constructed directly, but instead derived
 * classes should be used to implement the correct mapping of a source buffer.
 *
 * This allows treating CPU accessible memory through a generic interface
 * regardless of whether it originates from a libcamera FrameBuffer or other
 * source.
 */

/**
 * \typedef MappedBuffer::Plane
 * \brief A mapped region of memory accessible to the CPU
 *
 * The MappedBuffer::Plane uses the Span interface to describe the mapped memory
 * region.
 */

/**
 * \brief Construct an empty MappedBuffer
 */
MappedBuffer::MappedBuffer()
	: error_(0)
{
}

/**
 * \brief Move constructor, construct the MappedBuffer with the contents of \a
 * other using move semantics
 * \param[in] other The other MappedBuffer
 *
 * Moving a MappedBuffer moves the mappings contained in the \a other to the new
 * MappedBuffer and invalidates the \a other.
 *
 * No mappings are unmapped or destroyed in this process.
 */
MappedBuffer::MappedBuffer(MappedBuffer &&other)
{
	*this = std::move(other);
}

/**
 * \brief Move assignment operator, replace the mappings with those of \a other
* \param[in] other The other MappedBuffer
 *
 * Moving a MappedBuffer moves the mappings contained in the \a other to the new
 * MappedBuffer and invalidates the \a other.
 *
 * No mappings are unmapped or destroyed in this process.
 */
MappedBuffer &MappedBuffer::operator=(MappedBuffer &&other)
{
	error_ = other.error_;
	planes_ = std::move(other.planes_);
	maps_ = std::move(other.maps_);
	other.error_ = -ENOENT;

	return *this;
}

MappedBuffer::~MappedBuffer()
{
	for (Plane &map : maps_)
		munmap(map.data(), map.size());
}

/**
 * \fn MappedBuffer::isValid()
 * \brief Check if the MappedBuffer instance is valid
 * \return True if the MappedBuffer has valid mappings, false otherwise
 */

/**
 * \fn MappedBuffer::error()
 * \brief Retrieve the map error status
 *
 * This function retrieves the error status from the MappedBuffer.
 * The error status is a negative number as defined by errno.h. If
 * no error occurred, this function returns 0.
 *
 * \return The map error code
 */

/**
 * \fn MappedBuffer::planes()
 * \brief Retrieve the mapped planes