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1 | /* |
2 | * v4l2-fh.h |
3 | * |
4 | * V4L2 file handle. Store per file handle data for the V4L2 |
5 | * framework. Using file handles is optional for the drivers. |
6 | * |
7 | * Copyright (C) 2009--2010 Nokia Corporation. |
8 | * |
9 | * Contact: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com> |
10 | * |
11 | * This program is free software; you can redistribute it and/or |
12 | * modify it under the terms of the GNU General Public License |
13 | * version 2 as published by the Free Software Foundation. |
14 | * |
15 | * This program is distributed in the hope that it will be useful, but |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
18 | * General Public License for more details. |
19 | * |
20 | * You should have received a copy of the GNU General Public License |
21 | * along with this program; if not, write to the Free Software |
22 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
23 | * 02110-1301 USA |
24 | */ |
25 | |
26 | #ifndef V4L2_FH_H |
27 | #define V4L2_FH_H |
28 | |
29 | #include <linux/list.h> |
30 | |
31 | struct video_device; |
32 | struct v4l2_events; |
33 | |
34 | struct v4l2_fh { |
35 | struct list_head list; |
36 | struct video_device *vdev; |
37 | struct v4l2_events *events; /* events, pending and subscribed */ |
38 | }; |
39 | |
40 | /* |
41 | * Initialise the file handle. Parts of the V4L2 framework using the |
42 | * file handles should be initialised in this function. Must be called |
43 | * from driver's v4l2_file_operations->open() handler if the driver |
44 | * uses v4l2_fh. |
45 | */ |
46 | int v4l2_fh_init(struct v4l2_fh *fh, struct video_device *vdev); |
47 | /* |
48 | * Add the fh to the list of file handles on a video_device. The file |
49 | * handle must be initialised first. |
50 | */ |
51 | void v4l2_fh_add(struct v4l2_fh *fh); |
52 | /* |
53 | * Remove file handle from the list of file handles. Must be called in |
54 | * v4l2_file_operations->release() handler if the driver uses v4l2_fh. |
55 | */ |
56 | void v4l2_fh_del(struct v4l2_fh *fh); |
57 | /* |
58 | * Release resources related to a file handle. Parts of the V4L2 |
59 | * framework using the v4l2_fh must release their resources here, too. |
60 | * Must be called in v4l2_file_operations->release() handler if the |
61 | * driver uses v4l2_fh. |
62 | */ |
63 | void v4l2_fh_exit(struct v4l2_fh *fh); |
64 | |
65 | #endif /* V4L2_EVENT_H */ |
66 |
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