6 * Copyright (C) 2009--2010 Nokia Corporation.
8 * Contact: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * version 2 as published by the Free Software Foundation.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
28 #include <linux/types.h>
29 #include <linux/videodev2.h>
30 #include <linux/wait.h>
33 struct v4l2_subscribed_event;
37 /* list node for the v4l2_fh->available list */
38 struct list_head list;
39 /* pointer to parent v4l2_subscribed_event */
40 struct v4l2_subscribed_event *sev;
42 struct v4l2_event event;
45 struct v4l2_subscribed_event {
46 /* list node for the v4l2_fh->subscribed list */
47 struct list_head list;
50 /* associated object ID (e.g. control ID) */
52 /* copy of v4l2_event_subscription->flags */
54 /* filehandle that subscribed to this event */
56 /* list node that hooks into the object's event list (if there is one) */
57 struct list_head node;
58 /* Optional callback that can replace event 'old' with event 'new'. */
59 void (*replace)(struct v4l2_event *old,
60 const struct v4l2_event *new);
61 /* Optional callback that can merge event 'old' into event 'new'. */
62 void (*merge)(const struct v4l2_event *old,
63 struct v4l2_event *new);
64 /* the number of elements in the events array */
66 /* the index of the events containing the oldest available event */
68 /* the number of queued events */
70 /* an array of elems events */
71 struct v4l2_kevent events[];
74 int v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event,
76 void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev);
77 void v4l2_event_queue_fh(struct v4l2_fh *fh, const struct v4l2_event *ev);
78 int v4l2_event_pending(struct v4l2_fh *fh);
79 int v4l2_event_subscribe(struct v4l2_fh *fh,
80 struct v4l2_event_subscription *sub, unsigned elems);
81 int v4l2_event_unsubscribe(struct v4l2_fh *fh,
82 struct v4l2_event_subscription *sub);
83 void v4l2_event_unsubscribe_all(struct v4l2_fh *fh);
85 #endif /* V4L2_EVENT_H */