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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> |
35a24636 | 26 | #include <linux/export.h> |
176fb0d1 LP |
27 | |
28 | #include <media/media-device.h> | |
29 | #include <media/media-devnode.h> | |
53e269c1 | 30 | #include <media/media-entity.h> |
176fb0d1 | 31 | |
140d8816 LP |
32 | /* ----------------------------------------------------------------------------- |
33 | * Userspace API | |
34 | */ | |
35 | ||
36 | static int media_device_open(struct file *filp) | |
37 | { | |
38 | return 0; | |
39 | } | |
40 | ||
41 | static int media_device_close(struct file *filp) | |
42 | { | |
43 | return 0; | |
44 | } | |
45 | ||
46 | static int media_device_get_info(struct media_device *dev, | |
47 | struct media_device_info __user *__info) | |
48 | { | |
49 | struct media_device_info info; | |
50 | ||
51 | memset(&info, 0, sizeof(info)); | |
52 | ||
53 | strlcpy(info.driver, dev->dev->driver->name, sizeof(info.driver)); | |
54 | strlcpy(info.model, dev->model, sizeof(info.model)); | |
55 | strlcpy(info.serial, dev->serial, sizeof(info.serial)); | |
56 | strlcpy(info.bus_info, dev->bus_info, sizeof(info.bus_info)); | |
57 | ||
58 | info.media_version = MEDIA_API_VERSION; | |
59 | info.hw_revision = dev->hw_revision; | |
60 | info.driver_version = dev->driver_version; | |
61 | ||
62 | return copy_to_user(__info, &info, sizeof(*__info)); | |
63 | } | |
64 | ||
1651333b LP |
65 | static struct media_entity *find_entity(struct media_device *mdev, u32 id) |
66 | { | |
67 | struct media_entity *entity; | |
68 | int next = id & MEDIA_ENT_ID_FLAG_NEXT; | |
69 | ||
70 | id &= ~MEDIA_ENT_ID_FLAG_NEXT; | |
71 | ||
72 | spin_lock(&mdev->lock); | |
73 | ||
74 | media_device_for_each_entity(entity, mdev) { | |
75 | if ((entity->id == id && !next) || | |
76 | (entity->id > id && next)) { | |
77 | spin_unlock(&mdev->lock); | |
78 | return entity; | |
79 | } | |
80 | } | |
81 | ||
82 | spin_unlock(&mdev->lock); | |
83 | ||
84 | return NULL; | |
85 | } | |
86 | ||
87 | static long media_device_enum_entities(struct media_device *mdev, | |
88 | struct media_entity_desc __user *uent) | |
89 | { | |
90 | struct media_entity *ent; | |
91 | struct media_entity_desc u_ent; | |
92 | ||
93 | if (copy_from_user(&u_ent.id, &uent->id, sizeof(u_ent.id))) | |
94 | return -EFAULT; | |
95 | ||
96 | ent = find_entity(mdev, u_ent.id); | |
97 | ||
98 | if (ent == NULL) | |
99 | return -EINVAL; | |
100 | ||
101 | u_ent.id = ent->id; | |
102 | u_ent.name[0] = '\0'; | |
103 | if (ent->name) | |
104 | strlcpy(u_ent.name, ent->name, sizeof(u_ent.name)); | |
105 | u_ent.type = ent->type; | |
106 | u_ent.revision = ent->revision; | |
107 | u_ent.flags = ent->flags; | |
108 | u_ent.group_id = ent->group_id; | |
109 | u_ent.pads = ent->num_pads; | |
110 | u_ent.links = ent->num_links - ent->num_backlinks; | |
111 | u_ent.v4l.major = ent->v4l.major; | |
112 | u_ent.v4l.minor = ent->v4l.minor; | |
113 | if (copy_to_user(uent, &u_ent, sizeof(u_ent))) | |
114 | return -EFAULT; | |
115 | return 0; | |
116 | } | |
117 | ||
118 | static void media_device_kpad_to_upad(const struct media_pad *kpad, | |
119 | struct media_pad_desc *upad) | |
120 | { | |
121 | upad->entity = kpad->entity->id; | |
122 | upad->index = kpad->index; | |
123 | upad->flags = kpad->flags; | |
124 | } | |
125 | ||
126 | static long media_device_enum_links(struct media_device *mdev, | |
127 | struct media_links_enum __user *ulinks) | |
128 | { | |
129 | struct media_entity *entity; | |
130 | struct media_links_enum links; | |
131 | ||
132 | if (copy_from_user(&links, ulinks, sizeof(links))) | |
133 | return -EFAULT; | |
134 | ||
135 | entity = find_entity(mdev, links.entity); | |
136 | if (entity == NULL) | |
137 | return -EINVAL; | |
138 | ||
139 | if (links.pads) { | |
140 | unsigned int p; | |
141 | ||
142 | for (p = 0; p < entity->num_pads; p++) { | |
143 | struct media_pad_desc pad; | |
144 | media_device_kpad_to_upad(&entity->pads[p], &pad); | |
145 | if (copy_to_user(&links.pads[p], &pad, sizeof(pad))) | |
146 | return -EFAULT; | |
147 | } | |
148 | } | |
149 | ||
150 | if (links.links) { | |
151 | struct media_link_desc __user *ulink; | |
152 | unsigned int l; | |
153 | ||
154 | for (l = 0, ulink = links.links; l < entity->num_links; l++) { | |
155 | struct media_link_desc link; | |
156 | ||
157 | /* Ignore backlinks. */ | |
158 | if (entity->links[l].source->entity != entity) | |
159 | continue; | |
160 | ||
161 | media_device_kpad_to_upad(entity->links[l].source, | |
162 | &link.source); | |
163 | media_device_kpad_to_upad(entity->links[l].sink, | |
164 | &link.sink); | |
165 | link.flags = entity->links[l].flags; | |
166 | if (copy_to_user(ulink, &link, sizeof(*ulink))) | |
167 | return -EFAULT; | |
168 | ulink++; | |
169 | } | |
170 | } | |
171 | if (copy_to_user(ulinks, &links, sizeof(*ulinks))) | |
172 | return -EFAULT; | |
173 | return 0; | |
174 | } | |
175 | ||
97548ed4 LP |
176 | static long media_device_setup_link(struct media_device *mdev, |
177 | struct media_link_desc __user *_ulink) | |
178 | { | |
179 | struct media_link *link = NULL; | |
180 | struct media_link_desc ulink; | |
181 | struct media_entity *source; | |
182 | struct media_entity *sink; | |
183 | int ret; | |
184 | ||
185 | if (copy_from_user(&ulink, _ulink, sizeof(ulink))) | |
186 | return -EFAULT; | |
187 | ||
188 | /* Find the source and sink entities and link. | |
189 | */ | |
190 | source = find_entity(mdev, ulink.source.entity); | |
191 | sink = find_entity(mdev, ulink.sink.entity); | |
192 | ||
193 | if (source == NULL || sink == NULL) | |
194 | return -EINVAL; | |
195 | ||
196 | if (ulink.source.index >= source->num_pads || | |
197 | ulink.sink.index >= sink->num_pads) | |
198 | return -EINVAL; | |
199 | ||
200 | link = media_entity_find_link(&source->pads[ulink.source.index], | |
201 | &sink->pads[ulink.sink.index]); | |
202 | if (link == NULL) | |
203 | return -EINVAL; | |
204 | ||
205 | /* Setup the link on both entities. */ | |
206 | ret = __media_entity_setup_link(link, ulink.flags); | |
207 | ||
208 | if (copy_to_user(_ulink, &ulink, sizeof(ulink))) | |
209 | return -EFAULT; | |
210 | ||
211 | return ret; | |
212 | } | |
213 | ||
140d8816 LP |
214 | static long media_device_ioctl(struct file *filp, unsigned int cmd, |
215 | unsigned long arg) | |
216 | { | |
217 | struct media_devnode *devnode = media_devnode_data(filp); | |
218 | struct media_device *dev = to_media_device(devnode); | |
219 | long ret; | |
220 | ||
221 | switch (cmd) { | |
222 | case MEDIA_IOC_DEVICE_INFO: | |
223 | ret = media_device_get_info(dev, | |
224 | (struct media_device_info __user *)arg); | |
225 | break; | |
226 | ||
1651333b LP |
227 | case MEDIA_IOC_ENUM_ENTITIES: |
228 | ret = media_device_enum_entities(dev, | |
229 | (struct media_entity_desc __user *)arg); | |
230 | break; | |
231 | ||
232 | case MEDIA_IOC_ENUM_LINKS: | |
233 | mutex_lock(&dev->graph_mutex); | |
234 | ret = media_device_enum_links(dev, | |
235 | (struct media_links_enum __user *)arg); | |
236 | mutex_unlock(&dev->graph_mutex); | |
237 | break; | |
238 | ||
97548ed4 LP |
239 | case MEDIA_IOC_SETUP_LINK: |
240 | mutex_lock(&dev->graph_mutex); | |
241 | ret = media_device_setup_link(dev, | |
242 | (struct media_link_desc __user *)arg); | |
243 | mutex_unlock(&dev->graph_mutex); | |
244 | break; | |
245 | ||
140d8816 LP |
246 | default: |
247 | ret = -ENOIOCTLCMD; | |
248 | } | |
249 | ||
250 | return ret; | |
251 | } | |
252 | ||
176fb0d1 LP |
253 | static const struct media_file_operations media_device_fops = { |
254 | .owner = THIS_MODULE, | |
140d8816 LP |
255 | .open = media_device_open, |
256 | .ioctl = media_device_ioctl, | |
257 | .release = media_device_close, | |
176fb0d1 LP |
258 | }; |
259 | ||
260 | /* ----------------------------------------------------------------------------- | |
261 | * sysfs | |
262 | */ | |
263 | ||
264 | static ssize_t show_model(struct device *cd, | |
265 | struct device_attribute *attr, char *buf) | |
266 | { | |
267 | struct media_device *mdev = to_media_device(to_media_devnode(cd)); | |
268 | ||
269 | return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model); | |
270 | } | |
271 | ||
272 | static DEVICE_ATTR(model, S_IRUGO, show_model, NULL); | |
273 | ||
274 | /* ----------------------------------------------------------------------------- | |
275 | * Registration/unregistration | |
276 | */ | |
277 | ||
278 | static void media_device_release(struct media_devnode *mdev) | |
279 | { | |
280 | } | |
281 | ||
282 | /** | |
283 | * media_device_register - register a media device | |
284 | * @mdev: The media device | |
285 | * | |
286 | * The caller is responsible for initializing the media device before | |
287 | * registration. The following fields must be set: | |
288 | * | |
289 | * - dev must point to the parent device | |
290 | * - model must be filled with the device model name | |
291 | */ | |
292 | int __must_check media_device_register(struct media_device *mdev) | |
293 | { | |
294 | int ret; | |
295 | ||
296 | if (WARN_ON(mdev->dev == NULL || mdev->model[0] == 0)) | |
297 | return -EINVAL; | |
298 | ||
53e269c1 LP |
299 | mdev->entity_id = 1; |
300 | INIT_LIST_HEAD(&mdev->entities); | |
301 | spin_lock_init(&mdev->lock); | |
503c3d82 | 302 | mutex_init(&mdev->graph_mutex); |
53e269c1 | 303 | |
176fb0d1 LP |
304 | /* Register the device node. */ |
305 | mdev->devnode.fops = &media_device_fops; | |
306 | mdev->devnode.parent = mdev->dev; | |
307 | mdev->devnode.release = media_device_release; | |
308 | ret = media_devnode_register(&mdev->devnode); | |
309 | if (ret < 0) | |
310 | return ret; | |
311 | ||
312 | ret = device_create_file(&mdev->devnode.dev, &dev_attr_model); | |
313 | if (ret < 0) { | |
314 | media_devnode_unregister(&mdev->devnode); | |
315 | return ret; | |
316 | } | |
317 | ||
318 | return 0; | |
319 | } | |
320 | EXPORT_SYMBOL_GPL(media_device_register); | |
321 | ||
322 | /** | |
323 | * media_device_unregister - unregister a media device | |
324 | * @mdev: The media device | |
325 | * | |
326 | */ | |
327 | void media_device_unregister(struct media_device *mdev) | |
328 | { | |
53e269c1 LP |
329 | struct media_entity *entity; |
330 | struct media_entity *next; | |
331 | ||
332 | list_for_each_entry_safe(entity, next, &mdev->entities, list) | |
333 | media_device_unregister_entity(entity); | |
334 | ||
176fb0d1 LP |
335 | device_remove_file(&mdev->devnode.dev, &dev_attr_model); |
336 | media_devnode_unregister(&mdev->devnode); | |
337 | } | |
338 | EXPORT_SYMBOL_GPL(media_device_unregister); | |
53e269c1 LP |
339 | |
340 | /** | |
341 | * media_device_register_entity - Register an entity with a media device | |
342 | * @mdev: The media device | |
343 | * @entity: The entity | |
344 | */ | |
345 | int __must_check media_device_register_entity(struct media_device *mdev, | |
346 | struct media_entity *entity) | |
347 | { | |
348 | /* Warn if we apparently re-register an entity */ | |
349 | WARN_ON(entity->parent != NULL); | |
350 | entity->parent = mdev; | |
351 | ||
352 | spin_lock(&mdev->lock); | |
353 | if (entity->id == 0) | |
354 | entity->id = mdev->entity_id++; | |
355 | else | |
356 | mdev->entity_id = max(entity->id + 1, mdev->entity_id); | |
357 | list_add_tail(&entity->list, &mdev->entities); | |
358 | spin_unlock(&mdev->lock); | |
359 | ||
360 | return 0; | |
361 | } | |
362 | EXPORT_SYMBOL_GPL(media_device_register_entity); | |
363 | ||
364 | /** | |
365 | * media_device_unregister_entity - Unregister an entity | |
366 | * @entity: The entity | |
367 | * | |
368 | * If the entity has never been registered this function will return | |
369 | * immediately. | |
370 | */ | |
371 | void media_device_unregister_entity(struct media_entity *entity) | |
372 | { | |
373 | struct media_device *mdev = entity->parent; | |
374 | ||
375 | if (mdev == NULL) | |
376 | return; | |
377 | ||
378 | spin_lock(&mdev->lock); | |
379 | list_del(&entity->list); | |
380 | spin_unlock(&mdev->lock); | |
381 | entity->parent = NULL; | |
382 | } | |
383 | EXPORT_SYMBOL_GPL(media_device_unregister_entity); |