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* v4l2-event.h
* V4L2 events.
* Copyright (C) 2009--2010 Nokia Corporation.
* Contact: Sakari Ailus <>
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
#ifndef V4L2_EVENT_H
#define V4L2_EVENT_H
#include <linux/types.h>
#include <linux/videodev2.h>
#include <linux/wait.h>
struct v4l2_fh;
struct video_device;
struct v4l2_kevent {
struct list_head list;
struct v4l2_event event;
struct v4l2_subscribed_event {
struct list_head list;
u32 type;
struct v4l2_events {
wait_queue_head_t wait;
struct list_head subscribed; /* Subscribed events */
struct list_head free; /* Events ready for use */
struct list_head available; /* Dequeueable event */
unsigned int navailable;
unsigned int nallocated; /* Number of allocated events */
u32 sequence;
int v4l2_event_init(struct v4l2_fh *fh);
int v4l2_event_alloc(struct v4l2_fh *fh, unsigned int n);
void v4l2_event_free(struct v4l2_fh *fh);
int v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event,
int nonblocking);
void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev);
int v4l2_event_pending(struct v4l2_fh *fh);
int v4l2_event_subscribe(struct v4l2_fh *fh,
struct v4l2_event_subscription *sub);
int v4l2_event_unsubscribe(struct v4l2_fh *fh,
struct v4l2_event_subscription *sub);
#endif /* V4L2_EVENT_H */