diff options
author | Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> | 2021-04-12 13:02:09 +0200 |
---|---|---|
committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2021-06-08 12:04:08 +0200 |
commit | a810ed0b3370e0b3f448233d526d085effd1f829 (patch) | |
tree | 2a78bd9d06cc2ba2a6e7186c2574e8aff5a4b02e /drivers/media/common | |
parent | media: pci: tw5864: avoid usage of some characters (diff) | |
download | linux-a810ed0b3370e0b3f448233d526d085effd1f829.tar.xz linux-a810ed0b3370e0b3f448233d526d085effd1f829.zip |
media: videobuf2-v4l2.c: add vb2_queue_change_type() helper
On some platforms a video device can capture either video data or
metadata. The driver can implement vidioc functions for both video and
metadata, and use a single vb2_queue for the buffers. However, vb2_queue
requires choosing a single buffer type, which conflicts with the idea of
capturing either video or metadata.
The buffer type of vb2_queue can be changed, but it's not obvious how
this should be done in the drivers. To help this, add a new helper
function vb2_queue_change_type() which ensures the correct checks and
documents how it can be used.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/media/common')
-rw-r--r-- | drivers/media/common/videobuf2/videobuf2-v4l2.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c index 7e96f67c60ba..2988bb38ceb1 100644 --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c @@ -939,6 +939,20 @@ void vb2_queue_release(struct vb2_queue *q) } EXPORT_SYMBOL_GPL(vb2_queue_release); +int vb2_queue_change_type(struct vb2_queue *q, unsigned int type) +{ + if (type == q->type) + return 0; + + if (vb2_is_busy(q)) + return -EBUSY; + + q->type = type; + + return 0; +} +EXPORT_SYMBOL_GPL(vb2_queue_change_type); + __poll_t vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) { struct video_device *vfd = video_devdata(file); |