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>
30 int v4l2_device_register(struct device
*dev
, struct v4l2_device
*v4l2_dev
)
35 INIT_LIST_HEAD(&v4l2_dev
->subdevs
);
36 spin_lock_init(&v4l2_dev
->lock
);
39 /* If dev == NULL, then name must be filled in by the caller */
40 WARN_ON(!v4l2_dev
->name
[0]);
44 /* Set name to driver name + device name if it is empty. */
45 if (!v4l2_dev
->name
[0])
46 snprintf(v4l2_dev
->name
, sizeof(v4l2_dev
->name
), "%s %s",
47 dev
->driver
->name
, dev_name(dev
));
48 if (dev_get_drvdata(dev
))
49 v4l2_warn(v4l2_dev
, "Non-NULL drvdata on register\n");
50 dev_set_drvdata(dev
, v4l2_dev
);
53 EXPORT_SYMBOL_GPL(v4l2_device_register
);
55 int v4l2_device_set_name(struct v4l2_device
*v4l2_dev
, const char *basename
,
58 int num
= atomic_inc_return(instance
) - 1;
59 int len
= strlen(basename
);
61 if (basename
[len
- 1] >= '0' && basename
[len
- 1] <= '9')
62 snprintf(v4l2_dev
->name
, sizeof(v4l2_dev
->name
),
63 "%s-%d", basename
, num
);
65 snprintf(v4l2_dev
->name
, sizeof(v4l2_dev
->name
),
66 "%s%d", basename
, num
);
69 EXPORT_SYMBOL_GPL(v4l2_device_set_name
);
71 void v4l2_device_disconnect(struct v4l2_device
*v4l2_dev
)
74 dev_set_drvdata(v4l2_dev
->dev
, NULL
);
78 EXPORT_SYMBOL_GPL(v4l2_device_disconnect
);
80 void v4l2_device_unregister(struct v4l2_device
*v4l2_dev
)
82 struct v4l2_subdev
*sd
, *next
;
86 v4l2_device_disconnect(v4l2_dev
);
88 /* Unregister subdevs */
89 list_for_each_entry_safe(sd
, next
, &v4l2_dev
->subdevs
, list
) {
90 v4l2_device_unregister_subdev(sd
);
91 #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
92 if (sd
->flags
& V4L2_SUBDEV_FL_IS_I2C
) {
93 struct i2c_client
*client
= v4l2_get_subdevdata(sd
);
95 /* We need to unregister the i2c client explicitly.
96 We cannot rely on i2c_del_adapter to always
97 unregister clients for us, since if the i2c bus
98 is a platform bus, then it is never deleted. */
100 i2c_unregister_device(client
);
103 #if defined(CONFIG_SPI)
104 if (sd
->flags
& V4L2_SUBDEV_FL_IS_SPI
) {
105 struct spi_device
*spi
= v4l2_get_subdevdata(sd
);
108 spi_unregister_device(spi
);
113 EXPORT_SYMBOL_GPL(v4l2_device_unregister
);
115 int v4l2_device_register_subdev(struct v4l2_device
*v4l2_dev
,
116 struct v4l2_subdev
*sd
)
118 /* Check for valid input */
119 if (v4l2_dev
== NULL
|| sd
== NULL
|| !sd
->name
[0])
121 /* Warn if we apparently re-register a subdev */
122 WARN_ON(sd
->v4l2_dev
!= NULL
);
123 if (!try_module_get(sd
->owner
))
125 sd
->v4l2_dev
= v4l2_dev
;
126 spin_lock(&v4l2_dev
->lock
);
127 list_add_tail(&sd
->list
, &v4l2_dev
->subdevs
);
128 spin_unlock(&v4l2_dev
->lock
);
131 EXPORT_SYMBOL_GPL(v4l2_device_register_subdev
);
133 void v4l2_device_unregister_subdev(struct v4l2_subdev
*sd
)
135 /* return if it isn't registered */
136 if (sd
== NULL
|| sd
->v4l2_dev
== NULL
)
138 spin_lock(&sd
->v4l2_dev
->lock
);
140 spin_unlock(&sd
->v4l2_dev
->lock
);
142 module_put(sd
->owner
);
144 EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev
);