[media] v4l2-fh: add v4l2_fh_is_singular

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Several drivers need to do something when the first filehandle is opened
or the last filehandle is closed. Most implement some use count mechanism,
but if they use v4l2_fh, then you can also just check if this is the only
filehandle for the device node. A simple helper function can do this.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

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Hans Verkuil 2011-01-08 09:38:02 -03:00 • committed by Mauro Carvalho Chehab

parent 73cb42068c

commit dfddb2441f

2 changed files with 27 additions and 0 deletions

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include/media/v4l2-fh.h

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