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media: add V4L2_SUBDEV_CAP_STREAMS

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Add a subdev capability flag to expose to userspace if a subdev supports
multiplexed streams.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Tomi Valkeinen 2021-11-22 16:18:23 +01:00 committed by Mauro Carvalho Chehab
parent d6cc9c7c1a
commit 9a6b5bf4c1
2 changed files with 7 additions and 1 deletions
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5
drivers/media/v4l2-core/v4l2-subdev.c
View file

@ -446,6 +446,7 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg,
struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
struct v4l2_fh *vfh = file->private_data;
bool ro_subdev = test_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags);
bool streams_subdev = sd->flags & V4L2_SUBDEV_FL_STREAMS;
int rval;
switch (cmd) {
@ -454,7 +455,9 @@ static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg,
memset(cap->reserved, 0, sizeof(cap->reserved));
cap->version = LINUX_VERSION_CODE;
cap->capabilities = ro_subdev ? V4L2_SUBDEV_CAP_RO_SUBDEV : 0;
cap->capabilities =
(ro_subdev ? V4L2_SUBDEV_CAP_RO_SUBDEV : 0) |
(streams_subdev ? V4L2_SUBDEV_CAP_STREAMS : 0);
return 0;
}

3
include/uapi/linux/v4l2-subdev.h
View file

@ -175,6 +175,9 @@ struct v4l2_subdev_capability {
/* The v4l2 sub-device video device node is registered in read-only mode. */
#define V4L2_SUBDEV_CAP_RO_SUBDEV 0x00000001
/* The v4l2 sub-device supports routing and multiplexed streams. */
#define V4L2_SUBDEV_CAP_STREAMS 0x00000002
/* Backwards compatibility define --- to be removed */
#define v4l2_subdev_edid v4l2_edid