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[media] v4l: subdev: Add device node support

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Create a device node named subdevX for every registered subdev.

As the device node is registered before the subdev core::s_config
function is called, return -EGAIN on open until initialization
completes.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Vimarsh Zutshi <vimarsh.zutshi@gmail.com>
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Laurent Pinchart 2009-12-09 08:38:49 -03:00 • committed by Mauro Carvalho Chehab
parent 0070d91e5b
commit 2096a5dcf9
8 changed files with 158 additions and 22 deletions
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18
include/media/v4l2-dev.h
View file

@ -21,7 +21,8 @@
#define VFL_TYPE_GRABBER 0
#define VFL_TYPE_VBI 1
#define VFL_TYPE_RADIO 2
#define VFL_TYPE_MAX 3
#define VFL_TYPE_SUBDEV 3
#define VFL_TYPE_MAX 4
struct v4l2_ioctl_callbacks;
struct video_device;
@ -102,15 +103,26 @@ struct video_device
/* dev to video-device */
#define to_video_device(cd) container_of(cd, struct video_device, dev)
int __must_check __video_register_device(struct video_device *vdev, int type,
int nr, int warn_if_nr_in_use, struct module *owner);
/* Register video devices. Note that if video_register_device fails,
the release() callback of the video_device structure is *not* called, so
the caller is responsible for freeing any data. Usually that means that
you call video_device_release() on failure. */
int __must_check video_register_device(struct video_device *vdev, int type, int nr);
static inline int __must_check video_register_device(struct video_device *vdev,
int type, int nr)
{
return __video_register_device(vdev, type, nr, 1, vdev->fops->owner);
}
/* Same as video_register_device, but no warning is issued if the desired
device node number was already in use. */
int __must_check video_register_device_no_warn(struct video_device *vdev, int type, int nr);
static inline int __must_check video_register_device_no_warn(
struct video_device *vdev, int type, int nr)
{
return __video_register_device(vdev, type, nr, 0, vdev->fops->owner);
}
/* Unregister video devices. Will do nothing if vdev == NULL or
video_is_registered() returns false. */