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 #if defined(CONFIG_SPI)
25 #include <linux/spi/spi.h>
27 #include <linux/videodev2.h>
28 #include <media/v4l2-device.h>
29 #include <media/v4l2-ctrls.h>
31 int v4l2_device_register(struct device
*dev
, struct v4l2_device
*v4l2_dev
)
36 INIT_LIST_HEAD(&v4l2_dev
->subdevs
);
37 spin_lock_init(&v4l2_dev
->lock
);
38 mutex_init(&v4l2_dev
->ioctl_lock
);
41 /* If dev == NULL, then name must be filled in by the caller */
42 WARN_ON(!v4l2_dev
->name
[0]);
46 /* Set name to driver name + device name if it is empty. */
47 if (!v4l2_dev
->name
[0])
48 snprintf(v4l2_dev
->name
, sizeof(v4l2_dev
->name
), "%s %s",
49 dev
->driver
->name
, dev_name(dev
));
50 if (dev_get_drvdata(dev
))
51 v4l2_warn(v4l2_dev
, "Non-NULL drvdata on register\n");
52 dev_set_drvdata(dev
, v4l2_dev
);
55 EXPORT_SYMBOL_GPL(v4l2_device_register
);
57 int v4l2_device_set_name(struct v4l2_device
*v4l2_dev
, const char *basename
,
60 int num
= atomic_inc_return(instance
) - 1;
61 int len
= strlen(basename
);
63 if (basename
[len
- 1] >= '0' && basename
[len
- 1] <= '9')
64 snprintf(v4l2_dev
->name
, sizeof(v4l2_dev
->name
),
65 "%s-%d", basename
, num
);
67 snprintf(v4l2_dev
->name
, sizeof(v4l2_dev
->name
),
68 "%s%d", basename
, num
);
71 EXPORT_SYMBOL_GPL(v4l2_device_set_name
);
73 void v4l2_device_disconnect(struct v4l2_device
*v4l2_dev
)
76 dev_set_drvdata(v4l2_dev
->dev
, NULL
);
80 EXPORT_SYMBOL_GPL(v4l2_device_disconnect
);
82 void v4l2_device_unregister(struct v4l2_device
*v4l2_dev
)
84 struct v4l2_subdev
*sd
, *next
;
88 v4l2_device_disconnect(v4l2_dev
);
90 /* Unregister subdevs */
91 list_for_each_entry_safe(sd
, next
, &v4l2_dev
->subdevs
, list
) {
92 v4l2_device_unregister_subdev(sd
);
93 #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
94 if (sd
->flags
& V4L2_SUBDEV_FL_IS_I2C
) {
95 struct i2c_client
*client
= v4l2_get_subdevdata(sd
);
97 /* We need to unregister the i2c client explicitly.
98 We cannot rely on i2c_del_adapter to always
99 unregister clients for us, since if the i2c bus
100 is a platform bus, then it is never deleted. */
102 i2c_unregister_device(client
);
106 #if defined(CONFIG_SPI)
107 if (sd
->flags
& V4L2_SUBDEV_FL_IS_SPI
) {
108 struct spi_device
*spi
= v4l2_get_subdevdata(sd
);
111 spi_unregister_device(spi
);
117 EXPORT_SYMBOL_GPL(v4l2_device_unregister
);
119 int v4l2_device_register_subdev(struct v4l2_device
*v4l2_dev
,
120 struct v4l2_subdev
*sd
)
124 /* Check for valid input */
125 if (v4l2_dev
== NULL
|| sd
== NULL
|| !sd
->name
[0])
127 /* Warn if we apparently re-register a subdev */
128 WARN_ON(sd
->v4l2_dev
!= NULL
);
129 if (!try_module_get(sd
->owner
))
131 sd
->v4l2_dev
= v4l2_dev
;
132 if (sd
->internal_ops
&& sd
->internal_ops
->registered
) {
133 err
= sd
->internal_ops
->registered(sd
);
137 /* This just returns 0 if either of the two args is NULL */
138 err
= v4l2_ctrl_add_handler(v4l2_dev
->ctrl_handler
, sd
->ctrl_handler
);
140 if (sd
->internal_ops
&& sd
->internal_ops
->unregistered
)
141 sd
->internal_ops
->unregistered(sd
);
144 spin_lock(&v4l2_dev
->lock
);
145 list_add_tail(&sd
->list
, &v4l2_dev
->subdevs
);
146 spin_unlock(&v4l2_dev
->lock
);
149 EXPORT_SYMBOL_GPL(v4l2_device_register_subdev
);
151 void v4l2_device_unregister_subdev(struct v4l2_subdev
*sd
)
153 /* return if it isn't registered */
154 if (sd
== NULL
|| sd
->v4l2_dev
== NULL
)
156 spin_lock(&sd
->v4l2_dev
->lock
);
158 spin_unlock(&sd
->v4l2_dev
->lock
);
159 if (sd
->internal_ops
&& sd
->internal_ops
->unregistered
)
160 sd
->internal_ops
->unregistered(sd
);
162 module_put(sd
->owner
);
164 EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev
);