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;
36 /** struct v4l2_kevent - Internal kernel event struct.
37 * @list: List node for the v4l2_fh->available list.
38 * @sev: Pointer to parent v4l2_subscribed_event.
39 * @event: The event itself.
42 struct list_head list;
43 struct v4l2_subscribed_event *sev;
44 struct v4l2_event event;
47 /** struct v4l2_subscribed_event - Internal struct representing a subscribed event.
48 * @list: List node for the v4l2_fh->subscribed list.
50 * @id: Associated object ID (e.g. control ID). 0 if there isn't any.
51 * @flags: Copy of v4l2_event_subscription->flags.
52 * @fh: Filehandle that subscribed to this event.
53 * @node: List node that hooks into the object's event list (if there is one).
54 * @replace: Optional callback that can replace event 'old' with event 'new'.
55 * @merge: Optional callback that can merge event 'old' into event 'new'.
56 * @elems: The number of elements in the events array.
57 * @first: The index of the events containing the oldest available event.
58 * @in_use: The number of queued events.
59 * @events: An array of @elems events.
61 struct v4l2_subscribed_event {
62 struct list_head list;
67 struct list_head node;
68 void (*replace)(struct v4l2_event *old,
69 const struct v4l2_event *new);
70 void (*merge)(const struct v4l2_event *old,
71 struct v4l2_event *new);
75 struct v4l2_kevent events[];
78 int v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event,
80 void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev);
81 void v4l2_event_queue_fh(struct v4l2_fh *fh, const struct v4l2_event *ev);
82 int v4l2_event_pending(struct v4l2_fh *fh);
83 int v4l2_event_subscribe(struct v4l2_fh *fh,
84 struct v4l2_event_subscription *sub, unsigned elems);
85 int v4l2_event_unsubscribe(struct v4l2_fh *fh,
86 struct v4l2_event_subscription *sub);
87 void v4l2_event_unsubscribe_all(struct v4l2_fh *fh);
89 #endif /* V4L2_EVENT_H */