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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> | |
23 | #include <linux/i2c.h> | |
85e09219 DB |
24 | #if defined(CONFIG_SPI) |
25 | #include <linux/spi/spi.h> | |
26 | #endif | |
2a1fcdf0 HV |
27 | #include <linux/videodev2.h> |
28 | #include <media/v4l2-device.h> | |
11bbc1ca | 29 | #include <media/v4l2-ctrls.h> |
2a1fcdf0 HV |
30 | |
31 | int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev) | |
32 | { | |
3a63e449 | 33 | if (v4l2_dev == NULL) |
2a1fcdf0 | 34 | return -EINVAL; |
3a63e449 | 35 | |
2a1fcdf0 HV |
36 | INIT_LIST_HEAD(&v4l2_dev->subdevs); |
37 | spin_lock_init(&v4l2_dev->lock); | |
879aa24d | 38 | mutex_init(&v4l2_dev->ioctl_lock); |
2a1fcdf0 | 39 | v4l2_dev->dev = dev; |
3a63e449 HV |
40 | if (dev == NULL) { |
41 | /* If dev == NULL, then name must be filled in by the caller */ | |
42 | WARN_ON(!v4l2_dev->name[0]); | |
43 | return 0; | |
44 | } | |
45 | ||
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", | |
c3ef01ce | 49 | dev->driver->name, dev_name(dev)); |
3a63e449 HV |
50 | if (dev_get_drvdata(dev)) |
51 | v4l2_warn(v4l2_dev, "Non-NULL drvdata on register\n"); | |
2a1fcdf0 HV |
52 | dev_set_drvdata(dev, v4l2_dev); |
53 | return 0; | |
54 | } | |
55 | EXPORT_SYMBOL_GPL(v4l2_device_register); | |
56 | ||
102e7813 HV |
57 | int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename, |
58 | atomic_t *instance) | |
59 | { | |
60 | int num = atomic_inc_return(instance) - 1; | |
61 | int len = strlen(basename); | |
62 | ||
63 | if (basename[len - 1] >= '0' && basename[len - 1] <= '9') | |
64 | snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), | |
65 | "%s-%d", basename, num); | |
66 | else | |
67 | snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), | |
68 | "%s%d", basename, num); | |
69 | return num; | |
70 | } | |
71 | EXPORT_SYMBOL_GPL(v4l2_device_set_name); | |
72 | ||
ae6cfaac HV |
73 | void v4l2_device_disconnect(struct v4l2_device *v4l2_dev) |
74 | { | |
75 | if (v4l2_dev->dev) { | |
76 | dev_set_drvdata(v4l2_dev->dev, NULL); | |
77 | v4l2_dev->dev = NULL; | |
78 | } | |
79 | } | |
80 | EXPORT_SYMBOL_GPL(v4l2_device_disconnect); | |
81 | ||
2a1fcdf0 HV |
82 | void v4l2_device_unregister(struct v4l2_device *v4l2_dev) |
83 | { | |
84 | struct v4l2_subdev *sd, *next; | |
85 | ||
3a63e449 | 86 | if (v4l2_dev == NULL) |
2a1fcdf0 | 87 | return; |
ae6cfaac HV |
88 | v4l2_device_disconnect(v4l2_dev); |
89 | ||
3a63e449 | 90 | /* Unregister subdevs */ |
b5b2b7ed | 91 | list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list) { |
2a1fcdf0 | 92 | v4l2_device_unregister_subdev(sd); |
ef5b5168 | 93 | #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE)) |
b5b2b7ed HV |
94 | if (sd->flags & V4L2_SUBDEV_FL_IS_I2C) { |
95 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
96 | ||
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. */ | |
101 | if (client) | |
102 | i2c_unregister_device(client); | |
672dcd54 | 103 | continue; |
b5b2b7ed | 104 | } |
85e09219 DB |
105 | #endif |
106 | #if defined(CONFIG_SPI) | |
107 | if (sd->flags & V4L2_SUBDEV_FL_IS_SPI) { | |
108 | struct spi_device *spi = v4l2_get_subdevdata(sd); | |
109 | ||
110 | if (spi) | |
111 | spi_unregister_device(spi); | |
672dcd54 | 112 | continue; |
85e09219 | 113 | } |
b7fd6067 | 114 | #endif |
b5b2b7ed | 115 | } |
2a1fcdf0 HV |
116 | } |
117 | EXPORT_SYMBOL_GPL(v4l2_device_unregister); | |
118 | ||
3a63e449 HV |
119 | int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev, |
120 | struct v4l2_subdev *sd) | |
2a1fcdf0 | 121 | { |
11bbc1ca HV |
122 | int err; |
123 | ||
2a1fcdf0 | 124 | /* Check for valid input */ |
3a63e449 | 125 | if (v4l2_dev == NULL || sd == NULL || !sd->name[0]) |
2a1fcdf0 HV |
126 | return -EINVAL; |
127 | /* Warn if we apparently re-register a subdev */ | |
b0167600 | 128 | WARN_ON(sd->v4l2_dev != NULL); |
2a1fcdf0 HV |
129 | if (!try_module_get(sd->owner)) |
130 | return -ENODEV; | |
45f6f84a HV |
131 | sd->v4l2_dev = v4l2_dev; |
132 | if (sd->internal_ops && sd->internal_ops->registered) { | |
133 | err = sd->internal_ops->registered(sd); | |
134 | if (err) | |
135 | return err; | |
136 | } | |
11bbc1ca HV |
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); | |
45f6f84a HV |
139 | if (err) { |
140 | if (sd->internal_ops && sd->internal_ops->unregistered) | |
141 | sd->internal_ops->unregistered(sd); | |
11bbc1ca | 142 | return err; |
45f6f84a | 143 | } |
3a63e449 HV |
144 | spin_lock(&v4l2_dev->lock); |
145 | list_add_tail(&sd->list, &v4l2_dev->subdevs); | |
146 | spin_unlock(&v4l2_dev->lock); | |
2a1fcdf0 HV |
147 | return 0; |
148 | } | |
149 | EXPORT_SYMBOL_GPL(v4l2_device_register_subdev); | |
150 | ||
151 | void v4l2_device_unregister_subdev(struct v4l2_subdev *sd) | |
152 | { | |
153 | /* return if it isn't registered */ | |
b0167600 | 154 | if (sd == NULL || sd->v4l2_dev == NULL) |
2a1fcdf0 | 155 | return; |
b0167600 | 156 | spin_lock(&sd->v4l2_dev->lock); |
2a1fcdf0 | 157 | list_del(&sd->list); |
b0167600 | 158 | spin_unlock(&sd->v4l2_dev->lock); |
45f6f84a HV |
159 | if (sd->internal_ops && sd->internal_ops->unregistered) |
160 | sd->internal_ops->unregistered(sd); | |
b0167600 | 161 | sd->v4l2_dev = NULL; |
2a1fcdf0 HV |
162 | module_put(sd->owner); |
163 | } | |
164 | EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev); |