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[media] v4l2-ctrls: add a notify callback

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Sometimes platform/bridge drivers need to be notified when a control from
a sub-device changes value. In order to support this a notify callback was
added.
[dheitmueller@kernellabs.com: fix merge conflict in v4l2-ctrls.c]

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil
2012-09-07 04:46:39 -03:00
committed by Mauro Carvalho Chehab
parent 20deebfe17
commit 8ac7a9493a
3 changed files with 57 additions and 8 deletions
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18
drivers/media/v4l2-core/v4l2-ctrls.c
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@@ -1204,6 +1204,8 @@ static void new_to_cur(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl,
send_event(fh, ctrl,
(changed ? V4L2_EVENT_CTRL_CH_VALUE : 0) |
(update_inactive ? V4L2_EVENT_CTRL_CH_FLAGS : 0));
if (ctrl->call_notify && changed && ctrl->handler->notify)
ctrl->handler->notify(ctrl, ctrl->handler->notify_priv);
}
}
@@ -2725,6 +2727,22 @@ int v4l2_ctrl_s_ctrl_int64(struct v4l2_ctrl *ctrl, s64 val)
}
EXPORT_SYMBOL(v4l2_ctrl_s_ctrl_int64);
void v4l2_ctrl_notify(struct v4l2_ctrl *ctrl, v4l2_ctrl_notify_fnc notify, void *priv)
{
if (ctrl == NULL)
return;
if (notify == NULL) {
ctrl->call_notify = 0;
return;
}
if (WARN_ON(ctrl->handler->notify && ctrl->handler->notify != notify))
return;
ctrl->handler->notify = notify;
ctrl->handler->notify_priv = priv;
ctrl->call_notify = 1;
}
EXPORT_SYMBOL(v4l2_ctrl_notify);
static int v4l2_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems)
{
struct v4l2_ctrl *ctrl = v4l2_ctrl_find(sev->fh->ctrl_handler, sev->id);