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176fb0d1 LP |
1 | /* |
2 | * Media device | |
3 | * | |
4 | * Copyright (C) 2010 Nokia Corporation | |
5 | * | |
6 | * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com> | |
7 | * Sakari Ailus <sakari.ailus@iki.fi> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | ||
23 | #include <linux/types.h> | |
24 | #include <linux/ioctl.h> | |
140d8816 | 25 | #include <linux/media.h> |
176fb0d1 LP |
26 | |
27 | #include <media/media-device.h> | |
28 | #include <media/media-devnode.h> | |
53e269c1 | 29 | #include <media/media-entity.h> |
176fb0d1 | 30 | |
140d8816 LP |
31 | /* ----------------------------------------------------------------------------- |
32 | * Userspace API | |
33 | */ | |
34 | ||
35 | static int media_device_open(struct file *filp) | |
36 | { | |
37 | return 0; | |
38 | } | |
39 | ||
40 | static int media_device_close(struct file *filp) | |
41 | { | |
42 | return 0; | |
43 | } | |
44 | ||
45 | static int media_device_get_info(struct media_device *dev, | |
46 | struct media_device_info __user *__info) | |
47 | { | |
48 | struct media_device_info info; | |
49 | ||
50 | memset(&info, 0, sizeof(info)); | |
51 | ||
52 | strlcpy(info.driver, dev->dev->driver->name, sizeof(info.driver)); | |
53 | strlcpy(info.model, dev->model, sizeof(info.model)); | |
54 | strlcpy(info.serial, dev->serial, sizeof(info.serial)); | |
55 | strlcpy(info.bus_info, dev->bus_info, sizeof(info.bus_info)); | |
56 | ||
57 | info.media_version = MEDIA_API_VERSION; | |
58 | info.hw_revision = dev->hw_revision; | |
59 | info.driver_version = dev->driver_version; | |
60 | ||
61 | return copy_to_user(__info, &info, sizeof(*__info)); | |
62 | } | |
63 | ||
64 | static long media_device_ioctl(struct file *filp, unsigned int cmd, | |
65 | unsigned long arg) | |
66 | { | |
67 | struct media_devnode *devnode = media_devnode_data(filp); | |
68 | struct media_device *dev = to_media_device(devnode); | |
69 | long ret; | |
70 | ||
71 | switch (cmd) { | |
72 | case MEDIA_IOC_DEVICE_INFO: | |
73 | ret = media_device_get_info(dev, | |
74 | (struct media_device_info __user *)arg); | |
75 | break; | |
76 | ||
77 | default: | |
78 | ret = -ENOIOCTLCMD; | |
79 | } | |
80 | ||
81 | return ret; | |
82 | } | |
83 | ||
176fb0d1 LP |
84 | static const struct media_file_operations media_device_fops = { |
85 | .owner = THIS_MODULE, | |
140d8816 LP |
86 | .open = media_device_open, |
87 | .ioctl = media_device_ioctl, | |
88 | .release = media_device_close, | |
176fb0d1 LP |
89 | }; |
90 | ||
91 | /* ----------------------------------------------------------------------------- | |
92 | * sysfs | |
93 | */ | |
94 | ||
95 | static ssize_t show_model(struct device *cd, | |
96 | struct device_attribute *attr, char *buf) | |
97 | { | |
98 | struct media_device *mdev = to_media_device(to_media_devnode(cd)); | |
99 | ||
100 | return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model); | |
101 | } | |
102 | ||
103 | static DEVICE_ATTR(model, S_IRUGO, show_model, NULL); | |
104 | ||
105 | /* ----------------------------------------------------------------------------- | |
106 | * Registration/unregistration | |
107 | */ | |
108 | ||
109 | static void media_device_release(struct media_devnode *mdev) | |
110 | { | |
111 | } | |
112 | ||
113 | /** | |
114 | * media_device_register - register a media device | |
115 | * @mdev: The media device | |
116 | * | |
117 | * The caller is responsible for initializing the media device before | |
118 | * registration. The following fields must be set: | |
119 | * | |
120 | * - dev must point to the parent device | |
121 | * - model must be filled with the device model name | |
122 | */ | |
123 | int __must_check media_device_register(struct media_device *mdev) | |
124 | { | |
125 | int ret; | |
126 | ||
127 | if (WARN_ON(mdev->dev == NULL || mdev->model[0] == 0)) | |
128 | return -EINVAL; | |
129 | ||
53e269c1 LP |
130 | mdev->entity_id = 1; |
131 | INIT_LIST_HEAD(&mdev->entities); | |
132 | spin_lock_init(&mdev->lock); | |
503c3d82 | 133 | mutex_init(&mdev->graph_mutex); |
53e269c1 | 134 | |
176fb0d1 LP |
135 | /* Register the device node. */ |
136 | mdev->devnode.fops = &media_device_fops; | |
137 | mdev->devnode.parent = mdev->dev; | |
138 | mdev->devnode.release = media_device_release; | |
139 | ret = media_devnode_register(&mdev->devnode); | |
140 | if (ret < 0) | |
141 | return ret; | |
142 | ||
143 | ret = device_create_file(&mdev->devnode.dev, &dev_attr_model); | |
144 | if (ret < 0) { | |
145 | media_devnode_unregister(&mdev->devnode); | |
146 | return ret; | |
147 | } | |
148 | ||
149 | return 0; | |
150 | } | |
151 | EXPORT_SYMBOL_GPL(media_device_register); | |
152 | ||
153 | /** | |
154 | * media_device_unregister - unregister a media device | |
155 | * @mdev: The media device | |
156 | * | |
157 | */ | |
158 | void media_device_unregister(struct media_device *mdev) | |
159 | { | |
53e269c1 LP |
160 | struct media_entity *entity; |
161 | struct media_entity *next; | |
162 | ||
163 | list_for_each_entry_safe(entity, next, &mdev->entities, list) | |
164 | media_device_unregister_entity(entity); | |
165 | ||
176fb0d1 LP |
166 | device_remove_file(&mdev->devnode.dev, &dev_attr_model); |
167 | media_devnode_unregister(&mdev->devnode); | |
168 | } | |
169 | EXPORT_SYMBOL_GPL(media_device_unregister); | |
53e269c1 LP |
170 | |
171 | /** | |
172 | * media_device_register_entity - Register an entity with a media device | |
173 | * @mdev: The media device | |
174 | * @entity: The entity | |
175 | */ | |
176 | int __must_check media_device_register_entity(struct media_device *mdev, | |
177 | struct media_entity *entity) | |
178 | { | |
179 | /* Warn if we apparently re-register an entity */ | |
180 | WARN_ON(entity->parent != NULL); | |
181 | entity->parent = mdev; | |
182 | ||
183 | spin_lock(&mdev->lock); | |
184 | if (entity->id == 0) | |
185 | entity->id = mdev->entity_id++; | |
186 | else | |
187 | mdev->entity_id = max(entity->id + 1, mdev->entity_id); | |
188 | list_add_tail(&entity->list, &mdev->entities); | |
189 | spin_unlock(&mdev->lock); | |
190 | ||
191 | return 0; | |
192 | } | |
193 | EXPORT_SYMBOL_GPL(media_device_register_entity); | |
194 | ||
195 | /** | |
196 | * media_device_unregister_entity - Unregister an entity | |
197 | * @entity: The entity | |
198 | * | |
199 | * If the entity has never been registered this function will return | |
200 | * immediately. | |
201 | */ | |
202 | void media_device_unregister_entity(struct media_entity *entity) | |
203 | { | |
204 | struct media_device *mdev = entity->parent; | |
205 | ||
206 | if (mdev == NULL) | |
207 | return; | |
208 | ||
209 | spin_lock(&mdev->lock); | |
210 | list_del(&entity->list); | |
211 | spin_unlock(&mdev->lock); | |
212 | entity->parent = NULL; | |
213 | } | |
214 | EXPORT_SYMBOL_GPL(media_device_unregister_entity); |