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/slab.h>
25 #if defined(CONFIG_SPI)
26 #include <linux/spi/spi.h>
28 #include <linux/videodev2.h>
29 #include <media/v4l2-device.h>
30 #include <media/v4l2-ctrls.h>
32 int v4l2_device_register(struct device
*dev
, struct v4l2_device
*v4l2_dev
)
37 INIT_LIST_HEAD(&v4l2_dev
->subdevs
);
38 spin_lock_init(&v4l2_dev
->lock
);
39 mutex_init(&v4l2_dev
->ioctl_lock
);
40 v4l2_prio_init(&v4l2_dev
->prio
);
41 kref_init(&v4l2_dev
->ref
);
45 /* If dev == NULL, then name must be filled in by the caller */
46 WARN_ON(!v4l2_dev
->name
[0]);
50 /* Set name to driver name + device name if it is empty. */
51 if (!v4l2_dev
->name
[0])
52 snprintf(v4l2_dev
->name
, sizeof(v4l2_dev
->name
), "%s %s",
53 dev
->driver
->name
, dev_name(dev
));
54 if (!dev_get_drvdata(dev
))
55 dev_set_drvdata(dev
, v4l2_dev
);
58 EXPORT_SYMBOL_GPL(v4l2_device_register
);
60 static void v4l2_device_release(struct kref
*ref
)
62 struct v4l2_device
*v4l2_dev
=
63 container_of(ref
, struct v4l2_device
, ref
);
65 if (v4l2_dev
->release
)
66 v4l2_dev
->release(v4l2_dev
);
69 int v4l2_device_put(struct v4l2_device
*v4l2_dev
)
71 return kref_put(&v4l2_dev
->ref
, v4l2_device_release
);
73 EXPORT_SYMBOL_GPL(v4l2_device_put
);
75 int v4l2_device_set_name(struct v4l2_device
*v4l2_dev
, const char *basename
,
78 int num
= atomic_inc_return(instance
) - 1;
79 int len
= strlen(basename
);
81 if (basename
[len
- 1] >= '0' && basename
[len
- 1] <= '9')
82 snprintf(v4l2_dev
->name
, sizeof(v4l2_dev
->name
),
83 "%s-%d", basename
, num
);
85 snprintf(v4l2_dev
->name
, sizeof(v4l2_dev
->name
),
86 "%s%d", basename
, num
);
89 EXPORT_SYMBOL_GPL(v4l2_device_set_name
);
91 void v4l2_device_disconnect(struct v4l2_device
*v4l2_dev
)
93 if (v4l2_dev
->dev
== NULL
)
96 if (dev_get_drvdata(v4l2_dev
->dev
) == v4l2_dev
)
97 dev_set_drvdata(v4l2_dev
->dev
, NULL
);
98 put_device(v4l2_dev
->dev
);
101 EXPORT_SYMBOL_GPL(v4l2_device_disconnect
);
103 void v4l2_device_unregister(struct v4l2_device
*v4l2_dev
)
105 struct v4l2_subdev
*sd
, *next
;
107 if (v4l2_dev
== NULL
)
109 v4l2_device_disconnect(v4l2_dev
);
111 /* Unregister subdevs */
112 list_for_each_entry_safe(sd
, next
, &v4l2_dev
->subdevs
, list
) {
113 v4l2_device_unregister_subdev(sd
);
114 #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
115 if (sd
->flags
& V4L2_SUBDEV_FL_IS_I2C
) {
116 struct i2c_client
*client
= v4l2_get_subdevdata(sd
);
118 /* We need to unregister the i2c client explicitly.
119 We cannot rely on i2c_del_adapter to always
120 unregister clients for us, since if the i2c bus
121 is a platform bus, then it is never deleted. */
123 i2c_unregister_device(client
);
127 #if defined(CONFIG_SPI)
128 if (sd
->flags
& V4L2_SUBDEV_FL_IS_SPI
) {
129 struct spi_device
*spi
= v4l2_get_subdevdata(sd
);
132 spi_unregister_device(spi
);
138 EXPORT_SYMBOL_GPL(v4l2_device_unregister
);
140 int v4l2_device_register_subdev(struct v4l2_device
*v4l2_dev
,
141 struct v4l2_subdev
*sd
)
143 #if defined(CONFIG_MEDIA_CONTROLLER)
144 struct media_entity
*entity
= &sd
->entity
;
148 /* Check for valid input */
149 if (v4l2_dev
== NULL
|| sd
== NULL
|| !sd
->name
[0])
152 /* Warn if we apparently re-register a subdev */
153 WARN_ON(sd
->v4l2_dev
!= NULL
);
155 if (!try_module_get(sd
->owner
))
158 sd
->v4l2_dev
= v4l2_dev
;
159 if (sd
->internal_ops
&& sd
->internal_ops
->registered
) {
160 err
= sd
->internal_ops
->registered(sd
);
162 module_put(sd
->owner
);
167 /* This just returns 0 if either of the two args is NULL */
168 err
= v4l2_ctrl_add_handler(v4l2_dev
->ctrl_handler
, sd
->ctrl_handler
);
170 if (sd
->internal_ops
&& sd
->internal_ops
->unregistered
)
171 sd
->internal_ops
->unregistered(sd
);
172 module_put(sd
->owner
);
176 #if defined(CONFIG_MEDIA_CONTROLLER)
177 /* Register the entity. */
178 if (v4l2_dev
->mdev
) {
179 err
= media_device_register_entity(v4l2_dev
->mdev
, entity
);
181 if (sd
->internal_ops
&& sd
->internal_ops
->unregistered
)
182 sd
->internal_ops
->unregistered(sd
);
183 module_put(sd
->owner
);
189 spin_lock(&v4l2_dev
->lock
);
190 list_add_tail(&sd
->list
, &v4l2_dev
->subdevs
);
191 spin_unlock(&v4l2_dev
->lock
);
195 EXPORT_SYMBOL_GPL(v4l2_device_register_subdev
);
197 static void v4l2_device_release_subdev_node(struct video_device
*vdev
)
199 struct v4l2_subdev
*sd
= video_get_drvdata(vdev
);
204 int v4l2_device_register_subdev_nodes(struct v4l2_device
*v4l2_dev
)
206 struct video_device
*vdev
;
207 struct v4l2_subdev
*sd
;
210 /* Register a device node for every subdev marked with the
211 * V4L2_SUBDEV_FL_HAS_DEVNODE flag.
213 list_for_each_entry(sd
, &v4l2_dev
->subdevs
, list
) {
214 if (!(sd
->flags
& V4L2_SUBDEV_FL_HAS_DEVNODE
))
217 vdev
= kzalloc(sizeof(*vdev
), GFP_KERNEL
);
223 video_set_drvdata(vdev
, sd
);
224 strlcpy(vdev
->name
, sd
->name
, sizeof(vdev
->name
));
225 vdev
->v4l2_dev
= v4l2_dev
;
226 vdev
->fops
= &v4l2_subdev_fops
;
227 vdev
->release
= v4l2_device_release_subdev_node
;
228 vdev
->ctrl_handler
= sd
->ctrl_handler
;
229 err
= __video_register_device(vdev
, VFL_TYPE_SUBDEV
, -1, 1,
235 #if defined(CONFIG_MEDIA_CONTROLLER)
236 sd
->entity
.v4l
.major
= VIDEO_MAJOR
;
237 sd
->entity
.v4l
.minor
= vdev
->minor
;
244 list_for_each_entry(sd
, &v4l2_dev
->subdevs
, list
) {
247 video_unregister_device(sd
->devnode
);
252 EXPORT_SYMBOL_GPL(v4l2_device_register_subdev_nodes
);
254 void v4l2_device_unregister_subdev(struct v4l2_subdev
*sd
)
256 struct v4l2_device
*v4l2_dev
;
258 /* return if it isn't registered */
259 if (sd
== NULL
|| sd
->v4l2_dev
== NULL
)
262 v4l2_dev
= sd
->v4l2_dev
;
264 spin_lock(&v4l2_dev
->lock
);
266 spin_unlock(&v4l2_dev
->lock
);
268 if (sd
->internal_ops
&& sd
->internal_ops
->unregistered
)
269 sd
->internal_ops
->unregistered(sd
);
272 #if defined(CONFIG_MEDIA_CONTROLLER)
274 media_device_unregister_entity(&sd
->entity
);
276 video_unregister_device(sd
->devnode
);
277 module_put(sd
->owner
);
279 EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev
);