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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 | * | |
8c5dff90 | 8 | * Contact: Sakari Ailus <sakari.ailus@iki.fi> |
1babcb46 SA |
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. | |
1babcb46 SA |
18 | */ |
19 | ||
20 | #include <linux/bitops.h> | |
73cb4206 | 21 | #include <linux/slab.h> |
35a24636 | 22 | #include <linux/export.h> |
1babcb46 SA |
23 | #include <media/v4l2-dev.h> |
24 | #include <media/v4l2-fh.h> | |
c3b5b024 SA |
25 | #include <media/v4l2-event.h> |
26 | #include <media/v4l2-ioctl.h> | |
77fa4e07 | 27 | #include <media/v4l2-mc.h> |
1babcb46 | 28 | |
523f46d6 | 29 | void v4l2_fh_init(struct v4l2_fh *fh, struct video_device *vdev) |
1babcb46 SA |
30 | { |
31 | fh->vdev = vdev; | |
2d28b686 HV |
32 | /* Inherit from video_device. May be overridden by the driver. */ |
33 | fh->ctrl_handler = vdev->ctrl_handler; | |
1babcb46 SA |
34 | INIT_LIST_HEAD(&fh->list); |
35 | set_bit(V4L2_FL_USES_V4L2_FH, &fh->vdev->flags); | |
b7284bb0 RM |
36 | /* |
37 | * determine_valid_ioctls() does not know if struct v4l2_fh | |
38 | * is used by this driver, but here we do. So enable the | |
39 | * prio ioctls here. | |
40 | */ | |
41 | set_bit(_IOC_NR(VIDIOC_G_PRIORITY), vdev->valid_ioctls); | |
42 | set_bit(_IOC_NR(VIDIOC_S_PRIORITY), vdev->valid_ioctls); | |
fc5602be | 43 | fh->prio = V4L2_PRIORITY_UNSET; |
523f46d6 | 44 | init_waitqueue_head(&fh->wait); |
523f46d6 HV |
45 | INIT_LIST_HEAD(&fh->available); |
46 | INIT_LIST_HEAD(&fh->subscribed); | |
47 | fh->sequence = -1; | |
1babcb46 SA |
48 | } |
49 | EXPORT_SYMBOL_GPL(v4l2_fh_init); | |
50 | ||
51 | void v4l2_fh_add(struct v4l2_fh *fh) | |
52 | { | |
53 | unsigned long flags; | |
54 | ||
b7284bb0 | 55 | v4l2_prio_open(fh->vdev->prio, &fh->prio); |
1babcb46 SA |
56 | spin_lock_irqsave(&fh->vdev->fh_lock, flags); |
57 | list_add(&fh->list, &fh->vdev->fh_list); | |
58 | spin_unlock_irqrestore(&fh->vdev->fh_lock, flags); | |
59 | } | |
60 | EXPORT_SYMBOL_GPL(v4l2_fh_add); | |
61 | ||
73cb4206 HV |
62 | int v4l2_fh_open(struct file *filp) |
63 | { | |
64 | struct video_device *vdev = video_devdata(filp); | |
65 | struct v4l2_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL); | |
66 | ||
67 | filp->private_data = fh; | |
68 | if (fh == NULL) | |
69 | return -ENOMEM; | |
70 | v4l2_fh_init(fh, vdev); | |
71 | v4l2_fh_add(fh); | |
72 | return 0; | |
73 | } | |
74 | EXPORT_SYMBOL_GPL(v4l2_fh_open); | |
75 | ||
1babcb46 SA |
76 | void v4l2_fh_del(struct v4l2_fh *fh) |
77 | { | |
78 | unsigned long flags; | |
79 | ||
80 | spin_lock_irqsave(&fh->vdev->fh_lock, flags); | |
81 | list_del_init(&fh->list); | |
82 | spin_unlock_irqrestore(&fh->vdev->fh_lock, flags); | |
b7284bb0 | 83 | v4l2_prio_close(fh->vdev->prio, fh->prio); |
1babcb46 SA |
84 | } |
85 | EXPORT_SYMBOL_GPL(v4l2_fh_del); | |
86 | ||
87 | void v4l2_fh_exit(struct v4l2_fh *fh) | |
88 | { | |
89 | if (fh->vdev == NULL) | |
90 | return; | |
77fa4e07 | 91 | v4l_disable_media_source(fh->vdev); |
f1e393de | 92 | v4l2_event_unsubscribe_all(fh); |
6e239399 | 93 | fh->vdev = NULL; |
1babcb46 SA |
94 | } |
95 | EXPORT_SYMBOL_GPL(v4l2_fh_exit); | |
73cb4206 HV |
96 | |
97 | int v4l2_fh_release(struct file *filp) | |
98 | { | |
99 | struct v4l2_fh *fh = filp->private_data; | |
100 | ||
101 | if (fh) { | |
102 | v4l2_fh_del(fh); | |
103 | v4l2_fh_exit(fh); | |
104 | kfree(fh); | |
105 | } | |
106 | return 0; | |
107 | } | |
108 | EXPORT_SYMBOL_GPL(v4l2_fh_release); | |
dfddb244 HV |
109 | |
110 | int v4l2_fh_is_singular(struct v4l2_fh *fh) | |
111 | { | |
112 | unsigned long flags; | |
113 | int is_singular; | |
114 | ||
115 | if (fh == NULL || fh->vdev == NULL) | |
116 | return 0; | |
117 | spin_lock_irqsave(&fh->vdev->fh_lock, flags); | |
118 | is_singular = list_is_singular(&fh->list); | |
119 | spin_unlock_irqrestore(&fh->vdev->fh_lock, flags); | |
120 | return is_singular; | |
121 | } | |
122 | EXPORT_SYMBOL_GPL(v4l2_fh_is_singular); |