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+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * cio2.cpp - Intel IPU3 CIO2
+ */
+
+#include "cio2.h"
+
+#include <linux/media-bus-format.h>
+
+#include "libcamera/internal/camera_sensor.h"
+#include "libcamera/internal/media_device.h"
+#include "libcamera/internal/v4l2_subdevice.h"
+#include "libcamera/internal/v4l2_videodevice.h"
+
+namespace libcamera {
+
+LOG_DECLARE_CATEGORY(IPU3)
+
+CIO2Device::CIO2Device()
+ : output_(nullptr), csi2_(nullptr), sensor_(nullptr)
+{
+}
+
+CIO2Device::~CIO2Device()
+{
+ delete output_;
+ delete csi2_;
+ delete sensor_;
+}
+
+/**
+ * \brief Initialize components of the CIO2 device with \a index
+ * \param[in] media The CIO2 media device
+ * \param[in] index The CIO2 device index
+ *
+ * Create and open the video device and subdevices in the CIO2 instance at \a
+ * index, if a supported image sensor is connected to the CSI-2 receiver of
+ * this CIO2 instance. Enable the media links connecting the CIO2 components
+ * to prepare for capture operations and cached the sensor maximum size.
+ *
+ * \return 0 on success or a negative error code otherwise
+ * \retval -ENODEV No supported image sensor is connected to this CIO2 instance
+ */
+int CIO2Device::init(const MediaDevice *media, unsigned int index)
+{
+ int ret;
+
+ /*
+ * Verify that a sensor subdevice is connected to this CIO2 instance
+ * and enable the media link between the two.
+ */
+ std::string csi2Name = "ipu3-csi2 " + std::to_string(index);
+ MediaEntity *csi2Entity = media->getEntityByName(csi2Name);
+ const std::vector<MediaPad *> &pads = csi2Entity->pads();
+ if (pads.empty())
+ return -ENODEV;
+
+ /* IPU3 CSI-2 receivers have a single sink pad at index 0. */
+ MediaPad *sink = pads[0];
+ const std::vector<MediaLink *> &links = sink->links();
+ if (links.empty())
+ return -ENODEV;
+
+ MediaLink *link = links[0];
+ MediaEntity *sensorEntity = link->source()->entity();
+ sensor_ = new CameraSensor(sensorEntity);
+ ret = sensor_->init();
+ if (ret)
+ return ret;
+
+ ret = link->setEnabled(true);
+ if (ret)
+ return ret;
+
+ /*
+ * Make sure the sensor produces at least one format compatible with
+ * the CIO2 requirements.
+ *
+ * utils::set_overlap requires the ranges to be sorted, keep the
+ * cio2Codes vector sorted in ascending order.
+ */
+ const std::vector<unsigned int> cio2Codes{ MEDIA_BUS_FMT_SBGGR10_1X10,
+ MEDIA_BUS_FMT_SGRBG10_1X10,
+ MEDIA_BUS_FMT_SGBRG10_1X10,
+ MEDIA_BUS_FMT_SRGGB10_1X10 };
+ const std::vector<unsigned int> &sensorCodes = sensor_->mbusCodes();
+ if (!utils::set_overlap(sensorCodes.begin(), sensorCodes.end(),
+ cio2Codes.begin(), cio2Codes.end())) {
+ LOG(IPU3, Error)
+ << "Sensor " << sensor_->entity()->name()
+ << " has not format compatible with the IPU3";
+ return -EINVAL;
+ }
+
+ /*
+ * \todo Define when to open and close video device nodes, as they
+ * might impact on power consumption.
+ */
+
+ csi2_ = new V4L2Subdevice(csi2Entity);
+ ret = csi2_->open();
+ if (ret)
+ return ret;
+
+ std::string cio2Name = "ipu3-cio2 " + std::to_string(index);
+ output_ = V4L2VideoDevice::fromEntityName(media, cio2Name);
+ ret = output_->open();
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+/**
+ * \brief Configure the CIO2 unit
+ * \param[in] size The requested CIO2 output frame size
+ * \param[out] outputFormat The CIO2 unit output image format
+ * \return 0 on success or a negative error code otherwise
+ */
+int CIO2Device::configure(const Size &size, V4L2DeviceFormat *outputFormat)
+{
+ V4L2SubdeviceFormat sensorFormat;
+ int ret;
+
+ /*
+ * Apply the selected format to the sensor, the CSI-2 receiver and
+ * the CIO2 output device.
+ */
+ sensorFormat = sensor_->getFormat({ MEDIA_BUS_FMT_SBGGR10_1X10,
+ MEDIA_BUS_FMT_SGBRG10_1X10,
+ MEDIA_BUS_FMT_SGRBG10_1X10,
+ MEDIA_BUS_FMT_SRGGB10_1X10 },
+ size);
+ ret = sensor_->setFormat(&sensorFormat);
+ if (ret)
+ return ret;
+
+ ret = csi2_->setFormat(0, &sensorFormat);
+ if (ret)
+ return ret;
+
+ V4L2PixelFormat v4l2Format;
+ switch (sensorFormat.mbus_code) {
+ case MEDIA_BUS_FMT_SBGGR10_1X10:
+ v4l2Format = V4L2PixelFormat(V4L2_PIX_FMT_IPU3_SBGGR10);
+ break;
+ case MEDIA_BUS_FMT_SGBRG10_1X10:
+ v4l2Format = V4L2PixelFormat(V4L2_PIX_FMT_IPU3_SGBRG10);
+ break;
+ case MEDIA_BUS_FMT_SGRBG10_1X10:
+ v4l2Format = V4L2PixelFormat(V4L2_PIX_FMT_IPU3_SGRBG10);
+ break;
+ case MEDIA_BUS_FMT_SRGGB10_1X10:
+ v4l2Format = V4L2PixelFormat(V4L2_PIX_FMT_IPU3_SRGGB10);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ outputFormat->fourcc = v4l2Format;
+ outputFormat->size = sensorFormat.size;
+ outputFormat->planesCount = 1;
+
+ ret = output_->setFormat(outputFormat);
+ if (ret)
+ return ret;
+
+ LOG(IPU3, Debug) << "CIO2 output format " << outputFormat->toString();
+
+ return 0;
+}
+
+/**
+ * \brief Allocate frame buffers for the CIO2 output
+ *
+ * Allocate frame buffers in the CIO2 video device to be used to capture frames
+ * from the CIO2 output. The buffers are stored in the CIO2Device::buffers_
+ * vector.
+ *
+ * \return Number of buffers allocated or negative error code
+ */
+int CIO2Device::allocateBuffers()
+{
+ int ret = output_->allocateBuffers(CIO2_BUFFER_COUNT, &buffers_);
+ if (ret < 0)
+ return ret;
+
+ for (std::unique_ptr<FrameBuffer> &buffer : buffers_)
+ availableBuffers_.push(buffer.get());
+
+ return ret;
+}
+
+void CIO2Device::freeBuffers()
+{
+ /* The default std::queue constructor is explicit with gcc 5 and 6. */
+ availableBuffers_ = std::queue<FrameBuffer *>{};
+
+ buffers_.clear();
+
+ if (output_->releaseBuffers())
+ LOG(IPU3, Error) << "Failed to release CIO2 buffers";
+}
+
+FrameBuffer *CIO2Device::getBuffer()
+{
+ if (availableBuffers_.empty()) {
+ LOG(IPU3, Error) << "CIO2 buffer underrun";
+ return nullptr;
+ }
+
+ FrameBuffer *buffer = availableBuffers_.front();
+
+ availableBuffers_.pop();
+
+ return buffer;
+}
+
+void CIO2Device::putBuffer(FrameBuffer *buffer)
+{
+ availableBuffers_.push(buffer);
+}
+
+int CIO2Device::start()
+{
+ return output_->streamOn();
+}
+
+int CIO2Device::stop()
+{
+ return output_->streamOff();
+}
+
+} /* namespace libcamera */