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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>
28#endif
29#include <linux/videodev2.h>
30#include <media/v4l2-device.h>
31#include <media/v4l2-ctrls.h>
32
33int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev)
34{
35 if (v4l2_dev == NULL)
36 return -EINVAL;
37
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);
43 get_device(dev);
44 v4l2_dev->dev = dev;
45 if (dev == NULL) {
46
47 WARN_ON(!v4l2_dev->name[0]);
48 return 0;
49 }
50
51
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);
57 return 0;
58}
59EXPORT_SYMBOL_GPL(v4l2_device_register);
60
61static void v4l2_device_release(struct kref *ref)
62{
63 struct v4l2_device *v4l2_dev =
64 container_of(ref, struct v4l2_device, ref);
65
66 if (v4l2_dev->release)
67 v4l2_dev->release(v4l2_dev);
68}
69
70int v4l2_device_put(struct v4l2_device *v4l2_dev)
71{
72 return kref_put(&v4l2_dev->ref, v4l2_device_release);
73}
74EXPORT_SYMBOL_GPL(v4l2_device_put);
75
76int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename,
77 atomic_t *instance)
78{
79 int num = atomic_inc_return(instance) - 1;
80 int len = strlen(basename);
81
82 if (basename[len - 1] >= '0' && basename[len - 1] <= '9')
83 snprintf(v4l2_dev->name, sizeof(v4l2_dev->name),
84 "%s-%d", basename, num);
85 else
86 snprintf(v4l2_dev->name, sizeof(v4l2_dev->name),
87 "%s%d", basename, num);
88 return num;
89}
90EXPORT_SYMBOL_GPL(v4l2_device_set_name);
91
92void v4l2_device_disconnect(struct v4l2_device *v4l2_dev)
93{
94 if (v4l2_dev->dev == NULL)
95 return;
96
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;
101}
102EXPORT_SYMBOL_GPL(v4l2_device_disconnect);
103
104void v4l2_device_unregister(struct v4l2_device *v4l2_dev)
105{
106 struct v4l2_subdev *sd, *next;
107
108 if (v4l2_dev == NULL)
109 return;
110 v4l2_device_disconnect(v4l2_dev);
111
112
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);
118
119
120
121
122
123 if (client)
124 i2c_unregister_device(client);
125 continue;
126 }
127#endif
128#if defined(CONFIG_SPI)
129 if (sd->flags & V4L2_SUBDEV_FL_IS_SPI) {
130 struct spi_device *spi = v4l2_get_subdevdata(sd);
131
132 if (spi)
133 spi_unregister_device(spi);
134 continue;
135 }
136#endif
137 }
138}
139EXPORT_SYMBOL_GPL(v4l2_device_unregister);
140
141int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
142 struct v4l2_subdev *sd)
143{
144#if defined(CONFIG_MEDIA_CONTROLLER)
145 struct media_entity *entity = &sd->entity;
146#endif
147 int err;
148
149
150 if (v4l2_dev == NULL || sd == NULL || !sd->name[0])
151 return -EINVAL;
152
153
154 WARN_ON(sd->v4l2_dev != NULL);
155
156 if (!try_module_get(sd->owner))
157 return -ENODEV;
158
159 sd->v4l2_dev = v4l2_dev;
160 if (sd->internal_ops && sd->internal_ops->registered) {
161 err = sd->internal_ops->registered(sd);
162 if (err)
163 goto error_module;
164 }
165
166
167 err = v4l2_ctrl_add_handler(v4l2_dev->ctrl_handler, sd->ctrl_handler, NULL);
168 if (err)
169 goto error_unregister;
170
171#if defined(CONFIG_MEDIA_CONTROLLER)
172
173 if (v4l2_dev->mdev) {
174 err = media_device_register_entity(v4l2_dev->mdev, entity);
175 if (err < 0)
176 goto error_unregister;
177 }
178#endif
179
180 spin_lock(&v4l2_dev->lock);
181 list_add_tail(&sd->list, &v4l2_dev->subdevs);
182 spin_unlock(&v4l2_dev->lock);
183
184 return 0;
185
186error_unregister:
187 if (sd->internal_ops && sd->internal_ops->unregistered)
188 sd->internal_ops->unregistered(sd);
189error_module:
190 module_put(sd->owner);
191 sd->v4l2_dev = NULL;
192 return err;
193}
194EXPORT_SYMBOL_GPL(v4l2_device_register_subdev);
195
196static void v4l2_device_release_subdev_node(struct video_device *vdev)
197{
198 struct v4l2_subdev *sd = video_get_drvdata(vdev);
199 sd->devnode = NULL;
200 kfree(vdev);
201}
202
203int v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev)
204{
205 struct video_device *vdev;
206 struct v4l2_subdev *sd;
207 int err;
208
209
210
211
212 list_for_each_entry(sd, &v4l2_dev->subdevs, list) {
213 if (!(sd->flags & V4L2_SUBDEV_FL_HAS_DEVNODE))
214 continue;
215
216 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
217 if (!vdev) {
218 err = -ENOMEM;
219 goto clean_up;
220 }
221
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,
229 sd->owner);
230 if (err < 0) {
231 kfree(vdev);
232 goto clean_up;
233 }
234#if defined(CONFIG_MEDIA_CONTROLLER)
235 sd->entity.info.v4l.major = VIDEO_MAJOR;
236 sd->entity.info.v4l.minor = vdev->minor;
237#endif
238 sd->devnode = vdev;
239 }
240 return 0;
241
242clean_up:
243 list_for_each_entry(sd, &v4l2_dev->subdevs, list) {
244 if (!sd->devnode)
245 break;
246 video_unregister_device(sd->devnode);
247 }
248
249 return err;
250}
251EXPORT_SYMBOL_GPL(v4l2_device_register_subdev_nodes);
252
253void v4l2_device_unregister_subdev(struct v4l2_subdev *sd)
254{
255 struct v4l2_device *v4l2_dev;
256
257
258 if (sd == NULL || sd->v4l2_dev == NULL)
259 return;
260
261 v4l2_dev = sd->v4l2_dev;
262
263 spin_lock(&v4l2_dev->lock);
264 list_del(&sd->list);
265 spin_unlock(&v4l2_dev->lock);
266
267 if (sd->internal_ops && sd->internal_ops->unregistered)
268 sd->internal_ops->unregistered(sd);
269 sd->v4l2_dev = NULL;
270
271#if defined(CONFIG_MEDIA_CONTROLLER)
272 if (v4l2_dev->mdev)
273 media_device_unregister_entity(&sd->entity);
274#endif
275 video_unregister_device(sd->devnode);
276 module_put(sd->owner);
277}
278EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev);
279