linux-imx

/*

 * v4l2-event.h

 *

 * V4L2 events.

 *

 * Copyright (C) 2009--2010 Nokia Corporation.

 *

 * Contact: Sakari Ailus <sakari.ailus@iki.fi>

 *

 * 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

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 */

​

#ifndef V4L2_EVENT_H

#define V4L2_EVENT_H

​

#include <linux/types.h>

#include <linux/videodev2.h>

#include <linux/wait.h>

​

struct v4l2_fh;

struct v4l2_subdev;

struct v4l2_subscribed_event;

struct video_device;

​

/**

 * struct v4l2_kevent - Internal kernel event struct.

 * @list:   List node for the v4l2_fh->available list.

 * @sev:    Pointer to parent v4l2_subscribed_event.

 * @event:  The event itself.

 * @ts:     The timestamp of the event.

 */

struct v4l2_kevent {

    struct list_head    list;

    struct v4l2_subscribed_event *sev;

    struct v4l2_event   event;

    u64         ts;

};

​

/**

 * struct v4l2_subscribed_event_ops - Subscribed event operations.

 *

 * @add:    Optional callback, called when a new listener is added

 * @del:    Optional callback, called when a listener stops listening

 * @replace:    Optional callback that can replace event 'old' with event 'new'.

 * @merge:  Optional callback that can merge event 'old' into event 'new'.

 */

struct v4l2_subscribed_event_ops {

    int  (*add)(struct v4l2_subscribed_event *sev, unsigned int elems);

    void (*del)(struct v4l2_subscribed_event *sev);

    void (*replace)(struct v4l2_event *old, const struct v4l2_event *new);

    void (*merge)(const struct v4l2_event *old, struct v4l2_event *new);

};

​

/**

 * struct v4l2_subscribed_event - Internal struct representing a subscribed

 *      event.