blob: 3b86177c8cd2b1f1af6ffd35dc2a597b46a11150 [file] [log] [blame]
Sakari Ailusc3b5b022010-03-01 05:14:18 -03001/*
2 * v4l2-event.h
3 *
4 * V4L2 events.
5 *
6 * Copyright (C) 2009--2010 Nokia Corporation.
7 *
8 * Contact: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
9 *
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.
13 *
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.
18 *
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
22 * 02110-1301 USA
23 */
24
25#ifndef V4L2_EVENT_H
26#define V4L2_EVENT_H
27
28#include <linux/types.h>
29#include <linux/videodev2.h>
30#include <linux/wait.h>
31
32struct v4l2_fh;
33struct video_device;
34
35struct v4l2_kevent {
36 struct list_head list;
37 struct v4l2_event event;
38};
39
40struct v4l2_subscribed_event {
41 struct list_head list;
42 u32 type;
43};
44
45struct v4l2_events {
46 wait_queue_head_t wait;
47 struct list_head subscribed; /* Subscribed events */
48 struct list_head free; /* Events ready for use */
49 struct list_head available; /* Dequeueable event */
50 unsigned int navailable;
51 unsigned int nallocated; /* Number of allocated events */
52 u32 sequence;
53};
54
55int v4l2_event_init(struct v4l2_fh *fh);
56int v4l2_event_alloc(struct v4l2_fh *fh, unsigned int n);
57void v4l2_event_free(struct v4l2_fh *fh);
58int v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event,
59 int nonblocking);
60void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev);
61int v4l2_event_pending(struct v4l2_fh *fh);
62int v4l2_event_subscribe(struct v4l2_fh *fh,
63 struct v4l2_event_subscription *sub);
64int v4l2_event_unsubscribe(struct v4l2_fh *fh,
65 struct v4l2_event_subscription *sub);
66
67#endif /* V4L2_EVENT_H */