4 Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
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.
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.
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
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>
27 int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev)
32 INIT_LIST_HEAD(&v4l2_dev->subdevs);
33 spin_lock_init(&v4l2_dev->lock);
36 /* If dev == NULL, then name must be filled in by the caller */
37 WARN_ON(!v4l2_dev->name[0]);
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",
44 dev->driver->name, dev_name(dev));
45 if (dev_get_drvdata(dev))
46 v4l2_warn(v4l2_dev, "Non-NULL drvdata on register\n");
47 dev_set_drvdata(dev, v4l2_dev);
50 EXPORT_SYMBOL_GPL(v4l2_device_register);
52 int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename,
55 int num = atomic_inc_return(instance) - 1;
56 int len = strlen(basename);
58 if (basename[len - 1] >= '0' && basename[len - 1] <= '9')
59 snprintf(v4l2_dev->name, sizeof(v4l2_dev->name),
60 "%s-%d", basename, num);
62 snprintf(v4l2_dev->name, sizeof(v4l2_dev->name),
63 "%s%d", basename, num);
66 EXPORT_SYMBOL_GPL(v4l2_device_set_name);
68 void v4l2_device_disconnect(struct v4l2_device *v4l2_dev)
71 dev_set_drvdata(v4l2_dev->dev, NULL);
75 EXPORT_SYMBOL_GPL(v4l2_device_disconnect);
77 void v4l2_device_unregister(struct v4l2_device *v4l2_dev)
79 struct v4l2_subdev *sd, *next;
83 v4l2_device_disconnect(v4l2_dev);
85 /* Unregister subdevs */
86 list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list)
87 v4l2_device_unregister_subdev(sd);
89 EXPORT_SYMBOL_GPL(v4l2_device_unregister);
91 int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
92 struct v4l2_subdev *sd)
94 /* Check for valid input */
95 if (v4l2_dev == NULL || sd == NULL || !sd->name[0])
97 /* Warn if we apparently re-register a subdev */
98 WARN_ON(sd->v4l2_dev != NULL);
99 if (!try_module_get(sd->owner))
101 sd->v4l2_dev = v4l2_dev;
102 spin_lock(&v4l2_dev->lock);
103 list_add_tail(&sd->list, &v4l2_dev->subdevs);
104 spin_unlock(&v4l2_dev->lock);
107 EXPORT_SYMBOL_GPL(v4l2_device_register_subdev);
109 void v4l2_device_unregister_subdev(struct v4l2_subdev *sd)
111 /* return if it isn't registered */
112 if (sd == NULL || sd->v4l2_dev == NULL)
114 spin_lock(&sd->v4l2_dev->lock);
116 spin_unlock(&sd->v4l2_dev->lock);
118 module_put(sd->owner);
120 EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev);