From d769a595666bc4054fa59b9d13881a38497ea6ec Mon Sep 17 00:00:00 2001
From: Vedant Paranjape <vedantparanjape160201@gmail.com>
Date: Mon, 29 Nov 2021 21:43:36 +0530
Subject: v4l2: v4l2_camera_proxy: Add EXPBUF as one of the supported ioctl
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>
---
src/v4l2/v4l2_camera_proxy.cpp | 30 ++++++++++++++++++++++++++++++
src/v4l2/v4l2_camera_proxy.h | 1 +
2 files changed, 31 insertions(+)
(limited to 'src')
diff --git a/src/v4l2/v4l2_camera_proxy.cpp b/src/v4l2/v4l2_camera_proxy.cpp
index c1375777..4d529bc2 100644
--- a/src/v4l2/v4l2_camera_proxy.cpp
+++ b/src/v4l2/v4l2_camera_proxy.cpp
@@ -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;
diff --git a/src/v4l2/v4l2_camera_proxy.h b/src/v4l2/v4l2_camera_proxy.h
index fa0a49e0..14e027c3 100644
--- a/src/v4l2/v4l2_camera_proxy.h
+++ b/src/v4l2/v4l2_camera_proxy.h
@@ -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);
--
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