include/media/v4l2-event.h

   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 */