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c3b5b024 SA |
1 | /* |
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 | ||
32 | struct v4l2_fh; | |
33 | struct video_device; | |
34 | ||
35 | struct v4l2_kevent { | |
36 | struct list_head list; | |
37 | struct v4l2_event event; | |
38 | }; | |
39 | ||
40 | struct v4l2_subscribed_event { | |
41 | struct list_head list; | |
42 | u32 type; | |
43 | }; | |
44 | ||
45 | struct 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 | ||
55 | int v4l2_event_init(struct v4l2_fh *fh); | |
56 | int v4l2_event_alloc(struct v4l2_fh *fh, unsigned int n); | |
57 | void v4l2_event_free(struct v4l2_fh *fh); | |
58 | int v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event, | |
59 | int nonblocking); | |
60 | void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev); | |
61 | int v4l2_event_pending(struct v4l2_fh *fh); | |
62 | int v4l2_event_subscribe(struct v4l2_fh *fh, | |
63 | struct v4l2_event_subscription *sub); | |
64 | int v4l2_event_unsubscribe(struct v4l2_fh *fh, | |
65 | struct v4l2_event_subscription *sub); | |
66 | ||
67 | #endif /* V4L2_EVENT_H */ |