Commit | Line | Data |
---|---|---|
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> | |
7a707b89 | 23 | #include <linux/module.h> |
2a1fcdf0 | 24 | #include <linux/i2c.h> |
3e0ec41c | 25 | #include <linux/slab.h> |
85e09219 DB |
26 | #if defined(CONFIG_SPI) |
27 | #include <linux/spi/spi.h> | |
28 | #endif | |
2a1fcdf0 HV |
29 | #include <linux/videodev2.h> |
30 | #include <media/v4l2-device.h> | |
11bbc1ca | 31 | #include <media/v4l2-ctrls.h> |
2a1fcdf0 HV |
32 | |
33 | int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev) | |
34 | { | |
3a63e449 | 35 | if (v4l2_dev == NULL) |
2a1fcdf0 | 36 | return -EINVAL; |
3a63e449 | 37 | |
2a1fcdf0 HV |
38 | INIT_LIST_HEAD(&v4l2_dev->subdevs); |
39 | spin_lock_init(&v4l2_dev->lock); | |
879aa24d | 40 | mutex_init(&v4l2_dev->ioctl_lock); |
0f62fd6a | 41 | v4l2_prio_init(&v4l2_dev->prio); |
bedf8bcf | 42 | kref_init(&v4l2_dev->ref); |
236c5441 | 43 | get_device(dev); |
2a1fcdf0 | 44 | v4l2_dev->dev = dev; |
3a63e449 HV |
45 | if (dev == NULL) { |
46 | /* If dev == NULL, then name must be filled in by the caller */ | |
47 | WARN_ON(!v4l2_dev->name[0]); | |
48 | return 0; | |
49 | } | |
50 | ||
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", | |
c3ef01ce | 54 | dev->driver->name, dev_name(dev)); |
95db3a60 LP |
55 | if (!dev_get_drvdata(dev)) |
56 | dev_set_drvdata(dev, v4l2_dev); | |
2a1fcdf0 HV |
57 | return 0; |
58 | } | |
59 | EXPORT_SYMBOL_GPL(v4l2_device_register); | |
60 | ||
bedf8bcf HV |
61 | static 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 | ||
70 | int v4l2_device_put(struct v4l2_device *v4l2_dev) | |
71 | { | |
72 | return kref_put(&v4l2_dev->ref, v4l2_device_release); | |
73 | } | |
74 | EXPORT_SYMBOL_GPL(v4l2_device_put); | |
75 | ||
102e7813 HV |
76 | int 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 | } | |
90 | EXPORT_SYMBOL_GPL(v4l2_device_set_name); | |
91 | ||
ae6cfaac HV |
92 | void v4l2_device_disconnect(struct v4l2_device *v4l2_dev) |
93 | { | |
95db3a60 LP |
94 | if (v4l2_dev->dev == NULL) |
95 | return; | |
96 | ||
97 | if (dev_get_drvdata(v4l2_dev->dev) == v4l2_dev) | |
ae6cfaac | 98 | dev_set_drvdata(v4l2_dev->dev, NULL); |
236c5441 | 99 | put_device(v4l2_dev->dev); |
95db3a60 | 100 | v4l2_dev->dev = NULL; |
ae6cfaac HV |
101 | } |
102 | EXPORT_SYMBOL_GPL(v4l2_device_disconnect); | |
103 | ||
2a1fcdf0 HV |
104 | void v4l2_device_unregister(struct v4l2_device *v4l2_dev) |
105 | { | |
106 | struct v4l2_subdev *sd, *next; | |
107 | ||
3a63e449 | 108 | if (v4l2_dev == NULL) |
2a1fcdf0 | 109 | return; |
ae6cfaac HV |
110 | v4l2_device_disconnect(v4l2_dev); |
111 | ||
3a63e449 | 112 | /* Unregister subdevs */ |
b5b2b7ed | 113 | list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list) { |
2a1fcdf0 | 114 | v4l2_device_unregister_subdev(sd); |
ef5b5168 | 115 | #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE)) |
b5b2b7ed HV |
116 | if (sd->flags & V4L2_SUBDEV_FL_IS_I2C) { |
117 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
118 | ||
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. */ | |
123 | if (client) | |
124 | i2c_unregister_device(client); | |
672dcd54 | 125 | continue; |
b5b2b7ed | 126 | } |
85e09219 DB |
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); | |
672dcd54 | 134 | continue; |
85e09219 | 135 | } |
b7fd6067 | 136 | #endif |
b5b2b7ed | 137 | } |
2a1fcdf0 HV |
138 | } |
139 | EXPORT_SYMBOL_GPL(v4l2_device_unregister); | |
140 | ||
3a63e449 | 141 | int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev, |
61f5db54 | 142 | struct v4l2_subdev *sd) |
2a1fcdf0 | 143 | { |
61f5db54 LP |
144 | #if defined(CONFIG_MEDIA_CONTROLLER) |
145 | struct media_entity *entity = &sd->entity; | |
146 | #endif | |
11bbc1ca HV |
147 | int err; |
148 | ||
2a1fcdf0 | 149 | /* Check for valid input */ |
3a63e449 | 150 | if (v4l2_dev == NULL || sd == NULL || !sd->name[0]) |
2a1fcdf0 | 151 | return -EINVAL; |
2096a5dc | 152 | |
2a1fcdf0 | 153 | /* Warn if we apparently re-register a subdev */ |
b0167600 | 154 | WARN_ON(sd->v4l2_dev != NULL); |
2096a5dc | 155 | |
2a1fcdf0 HV |
156 | if (!try_module_get(sd->owner)) |
157 | return -ENODEV; | |
2096a5dc | 158 | |
45f6f84a HV |
159 | sd->v4l2_dev = v4l2_dev; |
160 | if (sd->internal_ops && sd->internal_ops->registered) { | |
161 | err = sd->internal_ops->registered(sd); | |
b7534f00 LP |
162 | if (err) { |
163 | module_put(sd->owner); | |
45f6f84a | 164 | return err; |
b7534f00 | 165 | } |
45f6f84a | 166 | } |
2096a5dc | 167 | |
11bbc1ca HV |
168 | /* This just returns 0 if either of the two args is NULL */ |
169 | err = v4l2_ctrl_add_handler(v4l2_dev->ctrl_handler, sd->ctrl_handler); | |
45f6f84a HV |
170 | if (err) { |
171 | if (sd->internal_ops && sd->internal_ops->unregistered) | |
172 | sd->internal_ops->unregistered(sd); | |
b7534f00 | 173 | module_put(sd->owner); |
11bbc1ca | 174 | return err; |
45f6f84a | 175 | } |
2096a5dc | 176 | |
61f5db54 LP |
177 | #if defined(CONFIG_MEDIA_CONTROLLER) |
178 | /* Register the entity. */ | |
179 | if (v4l2_dev->mdev) { | |
180 | err = media_device_register_entity(v4l2_dev->mdev, entity); | |
181 | if (err < 0) { | |
182 | if (sd->internal_ops && sd->internal_ops->unregistered) | |
183 | sd->internal_ops->unregistered(sd); | |
184 | module_put(sd->owner); | |
185 | return err; | |
186 | } | |
187 | } | |
188 | #endif | |
189 | ||
3a63e449 HV |
190 | spin_lock(&v4l2_dev->lock); |
191 | list_add_tail(&sd->list, &v4l2_dev->subdevs); | |
192 | spin_unlock(&v4l2_dev->lock); | |
2096a5dc | 193 | |
2a1fcdf0 HV |
194 | return 0; |
195 | } | |
196 | EXPORT_SYMBOL_GPL(v4l2_device_register_subdev); | |
197 | ||
3e0ec41c GL |
198 | static void v4l2_device_release_subdev_node(struct video_device *vdev) |
199 | { | |
200 | struct v4l2_subdev *sd = video_get_drvdata(vdev); | |
201 | sd->devnode = NULL; | |
202 | kfree(vdev); | |
203 | } | |
204 | ||
2096a5dc LP |
205 | int v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev) |
206 | { | |
207 | struct video_device *vdev; | |
208 | struct v4l2_subdev *sd; | |
209 | int err; | |
210 | ||
211 | /* Register a device node for every subdev marked with the | |
212 | * V4L2_SUBDEV_FL_HAS_DEVNODE flag. | |
213 | */ | |
214 | list_for_each_entry(sd, &v4l2_dev->subdevs, list) { | |
215 | if (!(sd->flags & V4L2_SUBDEV_FL_HAS_DEVNODE)) | |
216 | continue; | |
217 | ||
3e0ec41c GL |
218 | vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); |
219 | if (!vdev) { | |
220 | err = -ENOMEM; | |
221 | goto clean_up; | |
222 | } | |
223 | ||
224 | video_set_drvdata(vdev, sd); | |
2096a5dc LP |
225 | strlcpy(vdev->name, sd->name, sizeof(vdev->name)); |
226 | vdev->v4l2_dev = v4l2_dev; | |
227 | vdev->fops = &v4l2_subdev_fops; | |
3e0ec41c | 228 | vdev->release = v4l2_device_release_subdev_node; |
18d171ba | 229 | vdev->ctrl_handler = sd->ctrl_handler; |
2096a5dc LP |
230 | err = __video_register_device(vdev, VFL_TYPE_SUBDEV, -1, 1, |
231 | sd->owner); | |
3e0ec41c GL |
232 | if (err < 0) { |
233 | kfree(vdev); | |
234 | goto clean_up; | |
235 | } | |
61f5db54 | 236 | #if defined(CONFIG_MEDIA_CONTROLLER) |
fa5034c6 CL |
237 | sd->entity.info.v4l.major = VIDEO_MAJOR; |
238 | sd->entity.info.v4l.minor = vdev->minor; | |
61f5db54 | 239 | #endif |
3e0ec41c | 240 | sd->devnode = vdev; |
2096a5dc | 241 | } |
2096a5dc | 242 | return 0; |
3e0ec41c GL |
243 | |
244 | clean_up: | |
245 | list_for_each_entry(sd, &v4l2_dev->subdevs, list) { | |
246 | if (!sd->devnode) | |
247 | break; | |
248 | video_unregister_device(sd->devnode); | |
249 | } | |
250 | ||
251 | return err; | |
2096a5dc LP |
252 | } |
253 | EXPORT_SYMBOL_GPL(v4l2_device_register_subdev_nodes); | |
254 | ||
2a1fcdf0 HV |
255 | void v4l2_device_unregister_subdev(struct v4l2_subdev *sd) |
256 | { | |
61f5db54 LP |
257 | struct v4l2_device *v4l2_dev; |
258 | ||
2a1fcdf0 | 259 | /* return if it isn't registered */ |
b0167600 | 260 | if (sd == NULL || sd->v4l2_dev == NULL) |
2a1fcdf0 | 261 | return; |
2096a5dc | 262 | |
61f5db54 LP |
263 | v4l2_dev = sd->v4l2_dev; |
264 | ||
265 | spin_lock(&v4l2_dev->lock); | |
2a1fcdf0 | 266 | list_del(&sd->list); |
61f5db54 LP |
267 | spin_unlock(&v4l2_dev->lock); |
268 | ||
45f6f84a HV |
269 | if (sd->internal_ops && sd->internal_ops->unregistered) |
270 | sd->internal_ops->unregistered(sd); | |
b0167600 | 271 | sd->v4l2_dev = NULL; |
2096a5dc | 272 | |
61f5db54 LP |
273 | #if defined(CONFIG_MEDIA_CONTROLLER) |
274 | if (v4l2_dev->mdev) | |
275 | media_device_unregister_entity(&sd->entity); | |
276 | #endif | |
3e0ec41c | 277 | video_unregister_device(sd->devnode); |
2a1fcdf0 HV |
278 | module_put(sd->owner); |
279 | } | |
280 | EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev); |