Commit | Line | Data |
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1babcb46 SA |
1 | /* |
2 | * v4l2-fh.c | |
3 | * | |
4 | * V4L2 file handles. | |
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 | #include <linux/bitops.h> | |
26 | #include <media/v4l2-dev.h> | |
27 | #include <media/v4l2-fh.h> | |
28 | ||
29 | int v4l2_fh_init(struct v4l2_fh *fh, struct video_device *vdev) | |
30 | { | |
31 | fh->vdev = vdev; | |
32 | INIT_LIST_HEAD(&fh->list); | |
33 | set_bit(V4L2_FL_USES_V4L2_FH, &fh->vdev->flags); | |
34 | ||
35 | return 0; | |
36 | } | |
37 | EXPORT_SYMBOL_GPL(v4l2_fh_init); | |
38 | ||
39 | void v4l2_fh_add(struct v4l2_fh *fh) | |
40 | { | |
41 | unsigned long flags; | |
42 | ||
43 | spin_lock_irqsave(&fh->vdev->fh_lock, flags); | |
44 | list_add(&fh->list, &fh->vdev->fh_list); | |
45 | spin_unlock_irqrestore(&fh->vdev->fh_lock, flags); | |
46 | } | |
47 | EXPORT_SYMBOL_GPL(v4l2_fh_add); | |
48 | ||
49 | void v4l2_fh_del(struct v4l2_fh *fh) | |
50 | { | |
51 | unsigned long flags; | |
52 | ||
53 | spin_lock_irqsave(&fh->vdev->fh_lock, flags); | |
54 | list_del_init(&fh->list); | |
55 | spin_unlock_irqrestore(&fh->vdev->fh_lock, flags); | |
56 | } | |
57 | EXPORT_SYMBOL_GPL(v4l2_fh_del); | |
58 | ||
59 | void v4l2_fh_exit(struct v4l2_fh *fh) | |
60 | { | |
61 | if (fh->vdev == NULL) | |
62 | return; | |
63 | ||
64 | fh->vdev = NULL; | |
65 | } | |
66 | EXPORT_SYMBOL_GPL(v4l2_fh_exit); |