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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 | ||
b0a1f2a8 SA |
23 | #include <linux/compat.h> |
24 | #include <linux/export.h> | |
176fb0d1 | 25 | #include <linux/ioctl.h> |
140d8816 | 26 | #include <linux/media.h> |
b0a1f2a8 | 27 | #include <linux/types.h> |
176fb0d1 LP |
28 | |
29 | #include <media/media-device.h> | |
30 | #include <media/media-devnode.h> | |
53e269c1 | 31 | #include <media/media-entity.h> |
176fb0d1 | 32 | |
140d8816 LP |
33 | /* ----------------------------------------------------------------------------- |
34 | * Userspace API | |
35 | */ | |
36 | ||
37 | static int media_device_open(struct file *filp) | |
38 | { | |
39 | return 0; | |
40 | } | |
41 | ||
42 | static int media_device_close(struct file *filp) | |
43 | { | |
44 | return 0; | |
45 | } | |
46 | ||
47 | static int media_device_get_info(struct media_device *dev, | |
48 | struct media_device_info __user *__info) | |
49 | { | |
50 | struct media_device_info info; | |
51 | ||
52 | memset(&info, 0, sizeof(info)); | |
53 | ||
54 | strlcpy(info.driver, dev->dev->driver->name, sizeof(info.driver)); | |
55 | strlcpy(info.model, dev->model, sizeof(info.model)); | |
56 | strlcpy(info.serial, dev->serial, sizeof(info.serial)); | |
57 | strlcpy(info.bus_info, dev->bus_info, sizeof(info.bus_info)); | |
58 | ||
59 | info.media_version = MEDIA_API_VERSION; | |
60 | info.hw_revision = dev->hw_revision; | |
61 | info.driver_version = dev->driver_version; | |
62 | ||
b17d3945 NT |
63 | if (copy_to_user(__info, &info, sizeof(*__info))) |
64 | return -EFAULT; | |
65 | return 0; | |
140d8816 LP |
66 | } |
67 | ||
1651333b LP |
68 | static struct media_entity *find_entity(struct media_device *mdev, u32 id) |
69 | { | |
70 | struct media_entity *entity; | |
71 | int next = id & MEDIA_ENT_ID_FLAG_NEXT; | |
72 | ||
73 | id &= ~MEDIA_ENT_ID_FLAG_NEXT; | |
74 | ||
75 | spin_lock(&mdev->lock); | |
76 | ||
77 | media_device_for_each_entity(entity, mdev) { | |
78 | if ((entity->id == id && !next) || | |
79 | (entity->id > id && next)) { | |
80 | spin_unlock(&mdev->lock); | |
81 | return entity; | |
82 | } | |
83 | } | |
84 | ||
85 | spin_unlock(&mdev->lock); | |
86 | ||
87 | return NULL; | |
88 | } | |
89 | ||
90 | static long media_device_enum_entities(struct media_device *mdev, | |
91 | struct media_entity_desc __user *uent) | |
92 | { | |
93 | struct media_entity *ent; | |
94 | struct media_entity_desc u_ent; | |
95 | ||
4e32a7c6 | 96 | memset(&u_ent, 0, sizeof(u_ent)); |
1651333b LP |
97 | if (copy_from_user(&u_ent.id, &uent->id, sizeof(u_ent.id))) |
98 | return -EFAULT; | |
99 | ||
100 | ent = find_entity(mdev, u_ent.id); | |
101 | ||
102 | if (ent == NULL) | |
103 | return -EINVAL; | |
104 | ||
105 | u_ent.id = ent->id; | |
c06ca8f9 DC |
106 | if (ent->name) { |
107 | strncpy(u_ent.name, ent->name, sizeof(u_ent.name)); | |
108 | u_ent.name[sizeof(u_ent.name) - 1] = '\0'; | |
c06ca8f9 | 109 | } |
1651333b LP |
110 | u_ent.type = ent->type; |
111 | u_ent.revision = ent->revision; | |
112 | u_ent.flags = ent->flags; | |
113 | u_ent.group_id = ent->group_id; | |
114 | u_ent.pads = ent->num_pads; | |
115 | u_ent.links = ent->num_links - ent->num_backlinks; | |
fa5034c6 | 116 | memcpy(&u_ent.raw, &ent->info, sizeof(ent->info)); |
1651333b LP |
117 | if (copy_to_user(uent, &u_ent, sizeof(u_ent))) |
118 | return -EFAULT; | |
119 | return 0; | |
120 | } | |
121 | ||
122 | static void media_device_kpad_to_upad(const struct media_pad *kpad, | |
123 | struct media_pad_desc *upad) | |
124 | { | |
125 | upad->entity = kpad->entity->id; | |
126 | upad->index = kpad->index; | |
127 | upad->flags = kpad->flags; | |
128 | } | |
129 | ||
b0a1f2a8 SA |
130 | static long __media_device_enum_links(struct media_device *mdev, |
131 | struct media_links_enum *links) | |
1651333b LP |
132 | { |
133 | struct media_entity *entity; | |
1651333b | 134 | |
b0a1f2a8 | 135 | entity = find_entity(mdev, links->entity); |
1651333b LP |
136 | if (entity == NULL) |
137 | return -EINVAL; | |
138 | ||
b0a1f2a8 | 139 | if (links->pads) { |
1651333b LP |
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); | |
b0a1f2a8 | 145 | if (copy_to_user(&links->pads[p], &pad, sizeof(pad))) |
1651333b LP |
146 | return -EFAULT; |
147 | } | |
148 | } | |
149 | ||
b0a1f2a8 | 150 | if (links->links) { |
1651333b LP |
151 | struct media_link_desc __user *ulink; |
152 | unsigned int l; | |
153 | ||
b0a1f2a8 | 154 | for (l = 0, ulink = links->links; l < entity->num_links; l++) { |
1651333b LP |
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 | } | |
b0a1f2a8 SA |
171 | |
172 | return 0; | |
173 | } | |
174 | ||
175 | static long media_device_enum_links(struct media_device *mdev, | |
176 | struct media_links_enum __user *ulinks) | |
177 | { | |
178 | struct media_links_enum links; | |
179 | int rval; | |
180 | ||
181 | if (copy_from_user(&links, ulinks, sizeof(links))) | |
182 | return -EFAULT; | |
183 | ||
184 | rval = __media_device_enum_links(mdev, &links); | |
185 | if (rval < 0) | |
186 | return rval; | |
187 | ||
1651333b LP |
188 | if (copy_to_user(ulinks, &links, sizeof(*ulinks))) |
189 | return -EFAULT; | |
b0a1f2a8 | 190 | |
1651333b LP |
191 | return 0; |
192 | } | |
193 | ||
97548ed4 LP |
194 | static long media_device_setup_link(struct media_device *mdev, |
195 | struct media_link_desc __user *_ulink) | |
196 | { | |
197 | struct media_link *link = NULL; | |
198 | struct media_link_desc ulink; | |
199 | struct media_entity *source; | |
200 | struct media_entity *sink; | |
201 | int ret; | |
202 | ||
203 | if (copy_from_user(&ulink, _ulink, sizeof(ulink))) | |
204 | return -EFAULT; | |
205 | ||
206 | /* Find the source and sink entities and link. | |
207 | */ | |
208 | source = find_entity(mdev, ulink.source.entity); | |
209 | sink = find_entity(mdev, ulink.sink.entity); | |
210 | ||
211 | if (source == NULL || sink == NULL) | |
212 | return -EINVAL; | |
213 | ||
214 | if (ulink.source.index >= source->num_pads || | |
215 | ulink.sink.index >= sink->num_pads) | |
216 | return -EINVAL; | |
217 | ||
218 | link = media_entity_find_link(&source->pads[ulink.source.index], | |
219 | &sink->pads[ulink.sink.index]); | |
220 | if (link == NULL) | |
221 | return -EINVAL; | |
222 | ||
223 | /* Setup the link on both entities. */ | |
224 | ret = __media_entity_setup_link(link, ulink.flags); | |
225 | ||
226 | if (copy_to_user(_ulink, &ulink, sizeof(ulink))) | |
227 | return -EFAULT; | |
228 | ||
229 | return ret; | |
230 | } | |
231 | ||
140d8816 LP |
232 | static long media_device_ioctl(struct file *filp, unsigned int cmd, |
233 | unsigned long arg) | |
234 | { | |
235 | struct media_devnode *devnode = media_devnode_data(filp); | |
236 | struct media_device *dev = to_media_device(devnode); | |
237 | long ret; | |
238 | ||
239 | switch (cmd) { | |
240 | case MEDIA_IOC_DEVICE_INFO: | |
241 | ret = media_device_get_info(dev, | |
242 | (struct media_device_info __user *)arg); | |
243 | break; | |
244 | ||
1651333b LP |
245 | case MEDIA_IOC_ENUM_ENTITIES: |
246 | ret = media_device_enum_entities(dev, | |
247 | (struct media_entity_desc __user *)arg); | |
248 | break; | |
249 | ||
250 | case MEDIA_IOC_ENUM_LINKS: | |
251 | mutex_lock(&dev->graph_mutex); | |
252 | ret = media_device_enum_links(dev, | |
253 | (struct media_links_enum __user *)arg); | |
254 | mutex_unlock(&dev->graph_mutex); | |
255 | break; | |
256 | ||
97548ed4 LP |
257 | case MEDIA_IOC_SETUP_LINK: |
258 | mutex_lock(&dev->graph_mutex); | |
259 | ret = media_device_setup_link(dev, | |
260 | (struct media_link_desc __user *)arg); | |
261 | mutex_unlock(&dev->graph_mutex); | |
262 | break; | |
263 | ||
140d8816 LP |
264 | default: |
265 | ret = -ENOIOCTLCMD; | |
266 | } | |
267 | ||
268 | return ret; | |
269 | } | |
270 | ||
b0a1f2a8 SA |
271 | #ifdef CONFIG_COMPAT |
272 | ||
273 | struct media_links_enum32 { | |
274 | __u32 entity; | |
275 | compat_uptr_t pads; /* struct media_pad_desc * */ | |
276 | compat_uptr_t links; /* struct media_link_desc * */ | |
277 | __u32 reserved[4]; | |
278 | }; | |
279 | ||
280 | static long media_device_enum_links32(struct media_device *mdev, | |
281 | struct media_links_enum32 __user *ulinks) | |
282 | { | |
283 | struct media_links_enum links; | |
284 | compat_uptr_t pads_ptr, links_ptr; | |
285 | ||
286 | memset(&links, 0, sizeof(links)); | |
287 | ||
288 | if (get_user(links.entity, &ulinks->entity) | |
289 | || get_user(pads_ptr, &ulinks->pads) | |
290 | || get_user(links_ptr, &ulinks->links)) | |
291 | return -EFAULT; | |
292 | ||
293 | links.pads = compat_ptr(pads_ptr); | |
294 | links.links = compat_ptr(links_ptr); | |
295 | ||
296 | return __media_device_enum_links(mdev, &links); | |
297 | } | |
298 | ||
299 | #define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct media_links_enum32) | |
300 | ||
301 | static long media_device_compat_ioctl(struct file *filp, unsigned int cmd, | |
302 | unsigned long arg) | |
303 | { | |
304 | struct media_devnode *devnode = media_devnode_data(filp); | |
305 | struct media_device *dev = to_media_device(devnode); | |
306 | long ret; | |
307 | ||
308 | switch (cmd) { | |
309 | case MEDIA_IOC_DEVICE_INFO: | |
310 | case MEDIA_IOC_ENUM_ENTITIES: | |
311 | case MEDIA_IOC_SETUP_LINK: | |
312 | return media_device_ioctl(filp, cmd, arg); | |
313 | ||
314 | case MEDIA_IOC_ENUM_LINKS32: | |
315 | mutex_lock(&dev->graph_mutex); | |
316 | ret = media_device_enum_links32(dev, | |
317 | (struct media_links_enum32 __user *)arg); | |
318 | mutex_unlock(&dev->graph_mutex); | |
319 | break; | |
320 | ||
321 | default: | |
322 | ret = -ENOIOCTLCMD; | |
323 | } | |
324 | ||
325 | return ret; | |
326 | } | |
327 | #endif /* CONFIG_COMPAT */ | |
328 | ||
176fb0d1 LP |
329 | static const struct media_file_operations media_device_fops = { |
330 | .owner = THIS_MODULE, | |
140d8816 LP |
331 | .open = media_device_open, |
332 | .ioctl = media_device_ioctl, | |
b0a1f2a8 SA |
333 | #ifdef CONFIG_COMPAT |
334 | .compat_ioctl = media_device_compat_ioctl, | |
335 | #endif /* CONFIG_COMPAT */ | |
140d8816 | 336 | .release = media_device_close, |
176fb0d1 LP |
337 | }; |
338 | ||
339 | /* ----------------------------------------------------------------------------- | |
340 | * sysfs | |
341 | */ | |
342 | ||
343 | static ssize_t show_model(struct device *cd, | |
344 | struct device_attribute *attr, char *buf) | |
345 | { | |
346 | struct media_device *mdev = to_media_device(to_media_devnode(cd)); | |
347 | ||
348 | return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model); | |
349 | } | |
350 | ||
351 | static DEVICE_ATTR(model, S_IRUGO, show_model, NULL); | |
352 | ||
353 | /* ----------------------------------------------------------------------------- | |
354 | * Registration/unregistration | |
355 | */ | |
356 | ||
357 | static void media_device_release(struct media_devnode *mdev) | |
358 | { | |
359 | } | |
360 | ||
361 | /** | |
362 | * media_device_register - register a media device | |
363 | * @mdev: The media device | |
364 | * | |
365 | * The caller is responsible for initializing the media device before | |
366 | * registration. The following fields must be set: | |
367 | * | |
368 | * - dev must point to the parent device | |
369 | * - model must be filled with the device model name | |
370 | */ | |
371 | int __must_check media_device_register(struct media_device *mdev) | |
372 | { | |
373 | int ret; | |
374 | ||
375 | if (WARN_ON(mdev->dev == NULL || mdev->model[0] == 0)) | |
376 | return -EINVAL; | |
377 | ||
53e269c1 LP |
378 | mdev->entity_id = 1; |
379 | INIT_LIST_HEAD(&mdev->entities); | |
380 | spin_lock_init(&mdev->lock); | |
503c3d82 | 381 | mutex_init(&mdev->graph_mutex); |
53e269c1 | 382 | |
176fb0d1 LP |
383 | /* Register the device node. */ |
384 | mdev->devnode.fops = &media_device_fops; | |
385 | mdev->devnode.parent = mdev->dev; | |
386 | mdev->devnode.release = media_device_release; | |
387 | ret = media_devnode_register(&mdev->devnode); | |
388 | if (ret < 0) | |
389 | return ret; | |
390 | ||
391 | ret = device_create_file(&mdev->devnode.dev, &dev_attr_model); | |
392 | if (ret < 0) { | |
393 | media_devnode_unregister(&mdev->devnode); | |
394 | return ret; | |
395 | } | |
396 | ||
397 | return 0; | |
398 | } | |
399 | EXPORT_SYMBOL_GPL(media_device_register); | |
400 | ||
401 | /** | |
402 | * media_device_unregister - unregister a media device | |
403 | * @mdev: The media device | |
404 | * | |
405 | */ | |
406 | void media_device_unregister(struct media_device *mdev) | |
407 | { | |
53e269c1 LP |
408 | struct media_entity *entity; |
409 | struct media_entity *next; | |
410 | ||
411 | list_for_each_entry_safe(entity, next, &mdev->entities, list) | |
412 | media_device_unregister_entity(entity); | |
413 | ||
176fb0d1 LP |
414 | device_remove_file(&mdev->devnode.dev, &dev_attr_model); |
415 | media_devnode_unregister(&mdev->devnode); | |
416 | } | |
417 | EXPORT_SYMBOL_GPL(media_device_unregister); | |
53e269c1 LP |
418 | |
419 | /** | |
420 | * media_device_register_entity - Register an entity with a media device | |
421 | * @mdev: The media device | |
422 | * @entity: The entity | |
423 | */ | |
424 | int __must_check media_device_register_entity(struct media_device *mdev, | |
425 | struct media_entity *entity) | |
426 | { | |
427 | /* Warn if we apparently re-register an entity */ | |
428 | WARN_ON(entity->parent != NULL); | |
429 | entity->parent = mdev; | |
430 | ||
431 | spin_lock(&mdev->lock); | |
432 | if (entity->id == 0) | |
433 | entity->id = mdev->entity_id++; | |
434 | else | |
435 | mdev->entity_id = max(entity->id + 1, mdev->entity_id); | |
436 | list_add_tail(&entity->list, &mdev->entities); | |
437 | spin_unlock(&mdev->lock); | |
438 | ||
439 | return 0; | |
440 | } | |
441 | EXPORT_SYMBOL_GPL(media_device_register_entity); | |
442 | ||
443 | /** | |
444 | * media_device_unregister_entity - Unregister an entity | |
445 | * @entity: The entity | |
446 | * | |
447 | * If the entity has never been registered this function will return | |
448 | * immediately. | |
449 | */ | |
450 | void media_device_unregister_entity(struct media_entity *entity) | |
451 | { | |
452 | struct media_device *mdev = entity->parent; | |
453 | ||
454 | if (mdev == NULL) | |
455 | return; | |
456 | ||
457 | spin_lock(&mdev->lock); | |
458 | list_del(&entity->list); | |
459 | spin_unlock(&mdev->lock); | |
460 | entity->parent = NULL; | |
461 | } | |
462 | EXPORT_SYMBOL_GPL(media_device_unregister_entity); |