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/module.h>
24 #include <linux/i2c.h>
25 #include <linux/slab.h>
26 #if defined(CONFIG_SPI)
27 #include <linux/spi/spi.h>
29 #include <linux/videodev2.h>
30 #include <media/v4l2-device.h>
31 #include <media/v4l2-ctrls.h>
33 int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev)
38 INIT_LIST_HEAD(&v4l2_dev->subdevs);
39 spin_lock_init(&v4l2_dev->lock);
40 mutex_init(&v4l2_dev->ioctl_lock);
41 v4l2_prio_init(&v4l2_dev->prio);
42 kref_init(&v4l2_dev->ref);
46 /* If dev == NULL, then name must be filled in by the caller */
47 WARN_ON(!v4l2_dev->name[0]);
51 /* Set name to driver name + device name if it is empty. */
52 if (!v4l2_dev->name[0])
53 snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s %s",
54 dev->driver->name, dev_name(dev));
55 if (!dev_get_drvdata(dev))
56 dev_set_drvdata(dev, v4l2_dev);
59 EXPORT_SYMBOL_GPL(v4l2_device_register);
61 static void v4l2_device_release(struct kref *ref)
63 struct v4l2_device *v4l2_dev =
64 container_of(ref, struct v4l2_device, ref);
66 if (v4l2_dev->release)
67 v4l2_dev->release(v4l2_dev);
70 int v4l2_device_put(struct v4l2_device *v4l2_dev)
72 return kref_put(&v4l2_dev->ref, v4l2_device_release);
74 EXPORT_SYMBOL_GPL(v4l2_device_put);
76 int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename,
79 int num = atomic_inc_return(instance) - 1;
80 int len = strlen(basename);
82 if (basename[len - 1] >= '0' && basename[len - 1] <= '9')
83 snprintf(v4l2_dev->name, sizeof(v4l2_dev->name),
84 "%s-%d", basename, num);
86 snprintf(v4l2_dev->name, sizeof(v4l2_dev->name),
87 "%s%d", basename, num);
90 EXPORT_SYMBOL_GPL(v4l2_device_set_name);
92 void v4l2_device_disconnect(struct v4l2_device *v4l2_dev)
94 if (v4l2_dev->dev == NULL)
97 if (dev_get_drvdata(v4l2_dev->dev) == v4l2_dev)
98 dev_set_drvdata(v4l2_dev->dev, NULL);
99 put_device(v4l2_dev->dev);
100 v4l2_dev->dev = NULL;
102 EXPORT_SYMBOL_GPL(v4l2_device_disconnect);
104 void v4l2_device_unregister(struct v4l2_device *v4l2_dev)
106 struct v4l2_subdev *sd, *next;
108 if (v4l2_dev == NULL)
110 v4l2_device_disconnect(v4l2_dev);
112 /* Unregister subdevs */
113 list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list) {
114 v4l2_device_unregister_subdev(sd);
115 #if IS_ENABLED(CONFIG_I2C)
116 if (sd->flags & V4L2_SUBDEV_FL_IS_I2C) {
117 struct i2c_client *client = v4l2_get_subdevdata(sd);
119 /* We need to unregister the i2c client explicitly.
120 We cannot rely on i2c_del_adapter to always
121 unregister clients for us, since if the i2c bus
122 is a platform bus, then it is never deleted. */
124 i2c_unregister_device(client);
128 #if defined(CONFIG_SPI)
129 if (sd->flags & V4L2_SUBDEV_FL_IS_SPI) {
130 struct spi_device *spi = v4l2_get_subdevdata(sd);
133 spi_unregister_device(spi);
139 EXPORT_SYMBOL_GPL(v4l2_device_unregister);
141 int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
142 struct v4l2_subdev *sd)
144 #if defined(CONFIG_MEDIA_CONTROLLER)
145 struct media_entity *entity = &sd->entity;
149 /* Check for valid input */
150 if (v4l2_dev == NULL || sd == NULL || !sd->name[0])
153 /* Warn if we apparently re-register a subdev */
154 WARN_ON(sd->v4l2_dev != NULL);
156 if (!try_module_get(sd->owner))
159 sd->v4l2_dev = v4l2_dev;
160 if (sd->internal_ops && sd->internal_ops->registered) {
161 err = sd->internal_ops->registered(sd);
166 /* This just returns 0 if either of the two args is NULL */
167 err = v4l2_ctrl_add_handler(v4l2_dev->ctrl_handler, sd->ctrl_handler, NULL);
169 goto error_unregister;
171 #if defined(CONFIG_MEDIA_CONTROLLER)
172 /* Register the entity. */
173 if (v4l2_dev->mdev) {
174 err = media_device_register_entity(v4l2_dev->mdev, entity);
176 goto error_unregister;
180 spin_lock(&v4l2_dev->lock);
181 list_add_tail(&sd->list, &v4l2_dev->subdevs);
182 spin_unlock(&v4l2_dev->lock);
187 if (sd->internal_ops && sd->internal_ops->unregistered)
188 sd->internal_ops->unregistered(sd);
190 module_put(sd->owner);
194 EXPORT_SYMBOL_GPL(v4l2_device_register_subdev);
196 static void v4l2_device_release_subdev_node(struct video_device *vdev)
198 struct v4l2_subdev *sd = video_get_drvdata(vdev);
203 int v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev)
205 struct video_device *vdev;
206 struct v4l2_subdev *sd;
209 /* Register a device node for every subdev marked with the
210 * V4L2_SUBDEV_FL_HAS_DEVNODE flag.
212 list_for_each_entry(sd, &v4l2_dev->subdevs, list) {
213 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_DEVNODE))
216 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
222 video_set_drvdata(vdev, sd);
223 strlcpy(vdev->name, sd->name, sizeof(vdev->name));
224 vdev->v4l2_dev = v4l2_dev;
225 vdev->fops = &v4l2_subdev_fops;
226 vdev->release = v4l2_device_release_subdev_node;
227 vdev->ctrl_handler = sd->ctrl_handler;
228 err = __video_register_device(vdev, VFL_TYPE_SUBDEV, -1, 1,
234 #if defined(CONFIG_MEDIA_CONTROLLER)
235 sd->entity.info.v4l.major = VIDEO_MAJOR;
236 sd->entity.info.v4l.minor = vdev->minor;
243 list_for_each_entry(sd, &v4l2_dev->subdevs, list) {
246 video_unregister_device(sd->devnode);
251 EXPORT_SYMBOL_GPL(v4l2_device_register_subdev_nodes);
253 void v4l2_device_unregister_subdev(struct v4l2_subdev *sd)
255 struct v4l2_device *v4l2_dev;
257 /* return if it isn't registered */
258 if (sd == NULL || sd->v4l2_dev == NULL)
261 v4l2_dev = sd->v4l2_dev;
263 spin_lock(&v4l2_dev->lock);
265 spin_unlock(&v4l2_dev->lock);
267 if (sd->internal_ops && sd->internal_ops->unregistered)
268 sd->internal_ops->unregistered(sd);
271 #if defined(CONFIG_MEDIA_CONTROLLER)
273 media_device_unregister_entity(&sd->entity);
275 video_unregister_device(sd->devnode);
276 module_put(sd->owner);
278 EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev);