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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 | { | |
3a63e449 | 29 | if (v4l2_dev == NULL) |
2a1fcdf0 | 30 | return -EINVAL; |
3a63e449 | 31 | |
2a1fcdf0 HV |
32 | INIT_LIST_HEAD(&v4l2_dev->subdevs); |
33 | spin_lock_init(&v4l2_dev->lock); | |
34 | v4l2_dev->dev = dev; | |
3a63e449 HV |
35 | if (dev == NULL) { |
36 | /* If dev == NULL, then name must be filled in by the caller */ | |
37 | WARN_ON(!v4l2_dev->name[0]); | |
38 | return 0; | |
39 | } | |
40 | ||
41 | /* Set name to driver name + device name if it is empty. */ | |
42 | if (!v4l2_dev->name[0]) | |
43 | snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s %s", | |
c3ef01ce | 44 | dev->driver->name, dev_name(dev)); |
3a63e449 HV |
45 | if (dev_get_drvdata(dev)) |
46 | v4l2_warn(v4l2_dev, "Non-NULL drvdata on register\n"); | |
2a1fcdf0 HV |
47 | dev_set_drvdata(dev, v4l2_dev); |
48 | return 0; | |
49 | } | |
50 | EXPORT_SYMBOL_GPL(v4l2_device_register); | |
51 | ||
102e7813 HV |
52 | int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename, |
53 | atomic_t *instance) | |
54 | { | |
55 | int num = atomic_inc_return(instance) - 1; | |
56 | int len = strlen(basename); | |
57 | ||
58 | if (basename[len - 1] >= '0' && basename[len - 1] <= '9') | |
59 | snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), | |
60 | "%s-%d", basename, num); | |
61 | else | |
62 | snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), | |
63 | "%s%d", basename, num); | |
64 | return num; | |
65 | } | |
66 | EXPORT_SYMBOL_GPL(v4l2_device_set_name); | |
67 | ||
ae6cfaac HV |
68 | void v4l2_device_disconnect(struct v4l2_device *v4l2_dev) |
69 | { | |
70 | if (v4l2_dev->dev) { | |
71 | dev_set_drvdata(v4l2_dev->dev, NULL); | |
72 | v4l2_dev->dev = NULL; | |
73 | } | |
74 | } | |
75 | EXPORT_SYMBOL_GPL(v4l2_device_disconnect); | |
76 | ||
2a1fcdf0 HV |
77 | void v4l2_device_unregister(struct v4l2_device *v4l2_dev) |
78 | { | |
79 | struct v4l2_subdev *sd, *next; | |
80 | ||
3a63e449 | 81 | if (v4l2_dev == NULL) |
2a1fcdf0 | 82 | return; |
ae6cfaac HV |
83 | v4l2_device_disconnect(v4l2_dev); |
84 | ||
3a63e449 | 85 | /* Unregister subdevs */ |
b5b2b7ed | 86 | list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list) { |
2a1fcdf0 | 87 | v4l2_device_unregister_subdev(sd); |
ef5b5168 | 88 | #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE)) |
b5b2b7ed HV |
89 | if (sd->flags & V4L2_SUBDEV_FL_IS_I2C) { |
90 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
91 | ||
92 | /* We need to unregister the i2c client explicitly. | |
93 | We cannot rely on i2c_del_adapter to always | |
94 | unregister clients for us, since if the i2c bus | |
95 | is a platform bus, then it is never deleted. */ | |
96 | if (client) | |
97 | i2c_unregister_device(client); | |
98 | } | |
b7fd6067 | 99 | #endif |
b5b2b7ed | 100 | } |
2a1fcdf0 HV |
101 | } |
102 | EXPORT_SYMBOL_GPL(v4l2_device_unregister); | |
103 | ||
3a63e449 HV |
104 | int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev, |
105 | struct v4l2_subdev *sd) | |
2a1fcdf0 HV |
106 | { |
107 | /* Check for valid input */ | |
3a63e449 | 108 | if (v4l2_dev == NULL || sd == NULL || !sd->name[0]) |
2a1fcdf0 HV |
109 | return -EINVAL; |
110 | /* Warn if we apparently re-register a subdev */ | |
b0167600 | 111 | WARN_ON(sd->v4l2_dev != NULL); |
2a1fcdf0 HV |
112 | if (!try_module_get(sd->owner)) |
113 | return -ENODEV; | |
b0167600 | 114 | sd->v4l2_dev = v4l2_dev; |
3a63e449 HV |
115 | spin_lock(&v4l2_dev->lock); |
116 | list_add_tail(&sd->list, &v4l2_dev->subdevs); | |
117 | spin_unlock(&v4l2_dev->lock); | |
2a1fcdf0 HV |
118 | return 0; |
119 | } | |
120 | EXPORT_SYMBOL_GPL(v4l2_device_register_subdev); | |
121 | ||
122 | void v4l2_device_unregister_subdev(struct v4l2_subdev *sd) | |
123 | { | |
124 | /* return if it isn't registered */ | |
b0167600 | 125 | if (sd == NULL || sd->v4l2_dev == NULL) |
2a1fcdf0 | 126 | return; |
b0167600 | 127 | spin_lock(&sd->v4l2_dev->lock); |
2a1fcdf0 | 128 | list_del(&sd->list); |
b0167600 HV |
129 | spin_unlock(&sd->v4l2_dev->lock); |
130 | sd->v4l2_dev = NULL; | |
2a1fcdf0 HV |
131 | module_put(sd->owner); |
132 | } | |
133 | EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev); |