On Friday, January 07, 2011 14:25:41 Laurent Pinchart wrote:
> Hi Hans,
>
> On Friday 07 January 2011 13:47:33 Hans Verkuil wrote:
> > Drivers can use the has_new field to determine if a new value was specified
> > for a control. The v4l2_ctrl_handler_setup() must always set this to 1
> > since the setup has to force a full update of all controls.
>
> According to include/media/v4l2-ctrls.h, has_new is a "Internal flag: set when
> there is a valid new value". Drivers should then not use it.
>
> If you want to use the flag in a driver, the comment should be changed and its
> usage should be documented in Documentation/video4linux/v4l2-controls.txt.
Good catch. I'll document this.
Regards,
Hans
>
> > Signed-off-by: Hans Verkuil <hverkuil@xxxxxxxxx>
> > ---
> > drivers/media/video/v4l2-ctrls.c | 4 +++-
> > 1 files changed, 3 insertions(+), 1 deletions(-)
> >
> > diff --git a/drivers/media/video/v4l2-ctrls.c
> > b/drivers/media/video/v4l2-ctrls.c index 8f81efc..64f56bb 100644
> > --- a/drivers/media/video/v4l2-ctrls.c
> > +++ b/drivers/media/video/v4l2-ctrls.c
> > @@ -1280,8 +1280,10 @@ int v4l2_ctrl_handler_setup(struct v4l2_ctrl_handler
> > *hdl) if (ctrl->done)
> > continue;
> >
> > - for (i = 0; i < master->ncontrols; i++)
> > + for (i = 0; i < master->ncontrols; i++) {
> > cur_to_new(master->cluster[i]);
> > + master->cluster[i]->has_new = 1;
> > + }
> >
> > /* Skip button controls and read-only controls. */
> > if (ctrl->type == V4L2_CTRL_TYPE_BUTTON ||
>
>
--
Hans Verkuil - video4linux developer - sponsored by Cisco
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