Commit | Line | Data |
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2a1fcdf0 HV |
1 | /* |
2 | V4L2 device support. | |
3 | ||
4 | Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | ||
21 | #include <linux/types.h> | |
22 | #include <linux/ioctl.h> | |
23 | #include <linux/i2c.h> | |
24 | #include <linux/videodev2.h> | |
25 | #include <media/v4l2-device.h> | |
26 | ||
27 | int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev) | |
28 | { | |
29 | if (dev == NULL || v4l2_dev == NULL) | |
30 | return -EINVAL; | |
31 | /* Warn if we apparently re-register a device */ | |
32 | WARN_ON(dev_get_drvdata(dev)); | |
33 | INIT_LIST_HEAD(&v4l2_dev->subdevs); | |
34 | spin_lock_init(&v4l2_dev->lock); | |
35 | v4l2_dev->dev = dev; | |
36 | snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s %s", | |
37 | dev->driver->name, dev->bus_id); | |
38 | dev_set_drvdata(dev, v4l2_dev); | |
39 | return 0; | |
40 | } | |
41 | EXPORT_SYMBOL_GPL(v4l2_device_register); | |
42 | ||
43 | void v4l2_device_unregister(struct v4l2_device *v4l2_dev) | |
44 | { | |
45 | struct v4l2_subdev *sd, *next; | |
46 | ||
47 | if (v4l2_dev == NULL || v4l2_dev->dev == NULL) | |
48 | return; | |
49 | dev_set_drvdata(v4l2_dev->dev, NULL); | |
50 | /* unregister subdevs */ | |
51 | list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list) | |
52 | v4l2_device_unregister_subdev(sd); | |
53 | ||
54 | v4l2_dev->dev = NULL; | |
55 | } | |
56 | EXPORT_SYMBOL_GPL(v4l2_device_unregister); | |
57 | ||
58 | int v4l2_device_register_subdev(struct v4l2_device *dev, struct v4l2_subdev *sd) | |
59 | { | |
60 | /* Check for valid input */ | |
61 | if (dev == NULL || sd == NULL || !sd->name[0]) | |
62 | return -EINVAL; | |
63 | /* Warn if we apparently re-register a subdev */ | |
64 | WARN_ON(sd->dev); | |
65 | if (!try_module_get(sd->owner)) | |
66 | return -ENODEV; | |
67 | sd->dev = dev; | |
68 | spin_lock(&dev->lock); | |
69 | list_add_tail(&sd->list, &dev->subdevs); | |
70 | spin_unlock(&dev->lock); | |
71 | return 0; | |
72 | } | |
73 | EXPORT_SYMBOL_GPL(v4l2_device_register_subdev); | |
74 | ||
75 | void v4l2_device_unregister_subdev(struct v4l2_subdev *sd) | |
76 | { | |
77 | /* return if it isn't registered */ | |
78 | if (sd == NULL || sd->dev == NULL) | |
79 | return; | |
80 | spin_lock(&sd->dev->lock); | |
81 | list_del(&sd->list); | |
82 | spin_unlock(&sd->dev->lock); | |
83 | sd->dev = NULL; | |
84 | module_put(sd->owner); | |
85 | } | |
86 | EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev); |