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authorJonathan Herman <hermanjl@cs.unc.edu>2013-01-22 10:38:37 -0500
committerJonathan Herman <hermanjl@cs.unc.edu>2013-01-22 10:38:37 -0500
commitfcc9d2e5a6c89d22b8b773a64fb4ad21ac318446 (patch)
treea57612d1888735a2ec7972891b68c1ac5ec8faea /drivers/media/video/v4l2-fh.c
parent8dea78da5cee153b8af9c07a2745f6c55057fe12 (diff)
Added missing tegra files.HEADmaster
Diffstat (limited to 'drivers/media/video/v4l2-fh.c')
-rw-r--r--drivers/media/video/v4l2-fh.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/drivers/media/video/v4l2-fh.c b/drivers/media/video/v4l2-fh.c
new file mode 100644
index 00000000000..122822d2b8b
--- /dev/null
+++ b/drivers/media/video/v4l2-fh.c
@@ -0,0 +1,119 @@
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 <linux/slab.h>
27#include <media/v4l2-dev.h>
28#include <media/v4l2-fh.h>
29#include <media/v4l2-event.h>
30#include <media/v4l2-ioctl.h>
31
32void v4l2_fh_init(struct v4l2_fh *fh, struct video_device *vdev)
33{
34 fh->vdev = vdev;
35 /* Inherit from video_device. May be overridden by the driver. */
36 fh->ctrl_handler = vdev->ctrl_handler;
37 INIT_LIST_HEAD(&fh->list);
38 set_bit(V4L2_FL_USES_V4L2_FH, &fh->vdev->flags);
39 fh->prio = V4L2_PRIORITY_UNSET;
40 init_waitqueue_head(&fh->wait);
41 INIT_LIST_HEAD(&fh->available);
42 INIT_LIST_HEAD(&fh->subscribed);
43 fh->sequence = -1;
44}
45EXPORT_SYMBOL_GPL(v4l2_fh_init);
46
47void v4l2_fh_add(struct v4l2_fh *fh)
48{
49 unsigned long flags;
50
51 if (test_bit(V4L2_FL_USE_FH_PRIO, &fh->vdev->flags))
52 v4l2_prio_open(fh->vdev->prio, &fh->prio);
53 spin_lock_irqsave(&fh->vdev->fh_lock, flags);
54 list_add(&fh->list, &fh->vdev->fh_list);
55 spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
56}
57EXPORT_SYMBOL_GPL(v4l2_fh_add);
58
59int v4l2_fh_open(struct file *filp)
60{
61 struct video_device *vdev = video_devdata(filp);
62 struct v4l2_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL);
63
64 filp->private_data = fh;
65 if (fh == NULL)
66 return -ENOMEM;
67 v4l2_fh_init(fh, vdev);
68 v4l2_fh_add(fh);
69 return 0;
70}
71EXPORT_SYMBOL_GPL(v4l2_fh_open);
72
73void v4l2_fh_del(struct v4l2_fh *fh)
74{
75 unsigned long flags;
76
77 spin_lock_irqsave(&fh->vdev->fh_lock, flags);
78 list_del_init(&fh->list);
79 spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
80 if (test_bit(V4L2_FL_USE_FH_PRIO, &fh->vdev->flags))
81 v4l2_prio_close(fh->vdev->prio, fh->prio);
82}
83EXPORT_SYMBOL_GPL(v4l2_fh_del);
84
85void v4l2_fh_exit(struct v4l2_fh *fh)
86{
87 if (fh->vdev == NULL)
88 return;
89 v4l2_event_unsubscribe_all(fh);
90 fh->vdev = NULL;
91}
92EXPORT_SYMBOL_GPL(v4l2_fh_exit);
93
94int v4l2_fh_release(struct file *filp)
95{
96 struct v4l2_fh *fh = filp->private_data;
97
98 if (fh) {
99 v4l2_fh_del(fh);
100 v4l2_fh_exit(fh);
101 kfree(fh);
102 }
103 return 0;
104}
105EXPORT_SYMBOL_GPL(v4l2_fh_release);
106
107int v4l2_fh_is_singular(struct v4l2_fh *fh)
108{
109 unsigned long flags;
110 int is_singular;
111
112 if (fh == NULL || fh->vdev == NULL)
113 return 0;
114 spin_lock_irqsave(&fh->vdev->fh_lock, flags);
115 is_singular = list_is_singular(&fh->list);
116 spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
117 return is_singular;
118}
119EXPORT_SYMBOL_GPL(v4l2_fh_is_singular);