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v4l2: v4l2_camera_proxy: Add EXPBUF as one of the supported ioctl

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To support DMABUF as one of the memory buffer, we need to implement
EXPBUF in the v4l2 compat layer.

This patch implements vidioc_expbuf as one of the supported ioctls.

Bug: https://bugs.libcamera.org/show_bug.cgi?id=89
Signed-off-by: Vedant Paranjape <vedantparanjape160201@gmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Vedant Paranjape 2021-11-29 21:43:36 +05:30 • committed by Laurent Pinchart
parent 44d59841e1
commit d769a59566
2 changed files with 31 additions and 0 deletions
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30
src/v4l2/v4l2_camera_proxy.cpp
View file

@ -624,6 +624,32 @@ int V4L2CameraProxy::vidioc_dqbuf(V4L2CameraFile *file, struct v4l2_buffer *arg,
return 0;
}
int V4L2CameraProxy::vidioc_expbuf(V4L2CameraFile *file, struct v4l2_exportbuffer *arg)
{
LOG(V4L2Compat, Debug) << "Servicing vidioc_expbuf fd = " << file->efd();
if (!hasOwnership(file))
return -EBUSY;
/* \todo Verify that the memory type is MMAP when adding DMABUF support */
if (!validateBufferType(arg->type))
return -EINVAL;
if (arg->index >= bufferCount_)
return -EINVAL;
if (arg->flags & ~(O_CLOEXEC | O_ACCMODE))
return -EINVAL;
memset(arg->reserved, 0, sizeof(arg->reserved));
/* \todo honor the O_ACCMODE flags passed to this function */
arg->fd = fcntl(vcam_->getBufferFd(arg->index),
arg->flags & O_CLOEXEC ? F_DUPFD_CLOEXEC : F_DUPFD, 0);
return 0;
}
int V4L2CameraProxy::vidioc_streamon(V4L2CameraFile *file, int *arg)
{
LOG(V4L2Compat, Debug) << "Servicing vidioc_streamon fd = " << file->efd();
@ -685,6 +711,7 @@ const std::set<unsigned long> V4L2CameraProxy::supportedIoctls_ = {
VIDIOC_QUERYBUF,
VIDIOC_QBUF,
VIDIOC_DQBUF,
VIDIOC_EXPBUF,
VIDIOC_STREAMON,
VIDIOC_STREAMOFF,
};
@ -755,6 +782,9 @@ int V4L2CameraProxy::ioctl(V4L2CameraFile *file, unsigned long request, void *ar
case VIDIOC_DQBUF:
ret = vidioc_dqbuf(file, static_cast<struct v4l2_buffer *>(arg), &proxyMutex_);
break;
case VIDIOC_EXPBUF:
ret = vidioc_expbuf(file, static_cast<struct v4l2_exportbuffer *>(arg));
break;
case VIDIOC_STREAMON:
ret = vidioc_streamon(file, static_cast<int *>(arg));
break;

1
src/v4l2/v4l2_camera_proxy.h
View file

@ -60,6 +60,7 @@ private:
int vidioc_qbuf(V4L2CameraFile *file, struct v4l2_buffer *arg);
int vidioc_dqbuf(V4L2CameraFile *file, struct v4l2_buffer *arg,
libcamera::Mutex *lock) LIBCAMERA_TSA_REQUIRES(*lock);
int vidioc_expbuf(V4L2CameraFile *file, struct v4l2_exportbuffer *arg);
int vidioc_streamon(V4L2CameraFile *file, int *arg);
int vidioc_streamoff(V4L2CameraFile *file, int *arg);