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authorHans Verkuil <hans.verkuil@cisco.com>2012-09-07 04:46:39 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2013-01-05 00:49:54 -0200
commit8ac7a9493a4380a8a886fbfe311ab00bc424ca0f (patch)
tree25f60268aad8cf9f45c44b1ef7e8a2f30e506952 /drivers
parent20deebfe17b20ded00ba404adbcd014eb2b024c1 (diff)
[media] v4l2-ctrls: add a notify callback
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/media/v4l2-core/v4l2-ctrls.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index f6ee201d9347..fa02363e7db4 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -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);

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