4 * Copyright (C) 2010 Nokia Corporation
6 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
7 * Sakari Ailus <sakari.ailus@iki.fi>
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.
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.
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
23 #include <linux/compat.h>
24 #include <linux/export.h>
25 #include <linux/ioctl.h>
26 #include <linux/media.h>
27 #include <linux/types.h>
29 #include <media/media-device.h>
30 #include <media/media-devnode.h>
31 #include <media/media-entity.h>
33 /* -----------------------------------------------------------------------------
37 static int media_device_open(struct file *filp)
42 static int media_device_close(struct file *filp)
47 static int media_device_get_info(struct media_device *dev,
48 struct media_device_info __user *__info)
50 struct media_device_info info;
52 memset(&info, 0, sizeof(info));
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));
59 info.media_version = MEDIA_API_VERSION;
60 info.hw_revision = dev->hw_revision;
61 info.driver_version = dev->driver_version;
63 if (copy_to_user(__info, &info, sizeof(*__info)))
68 static struct media_entity *find_entity(struct media_device *mdev, u32 id)
70 struct media_entity *entity;
71 int next = id & MEDIA_ENT_ID_FLAG_NEXT;
73 id &= ~MEDIA_ENT_ID_FLAG_NEXT;
75 spin_lock(&mdev->lock);
77 media_device_for_each_entity(entity, mdev) {
78 if ((entity->id == id && !next) ||
79 (entity->id > id && next)) {
80 spin_unlock(&mdev->lock);
85 spin_unlock(&mdev->lock);
90 static long media_device_enum_entities(struct media_device *mdev,
91 struct media_entity_desc __user *uent)
93 struct media_entity *ent;
94 struct media_entity_desc u_ent;
96 if (copy_from_user(&u_ent.id, &uent->id, sizeof(u_ent.id)))
99 ent = find_entity(mdev, u_ent.id);
105 u_ent.name[0] = '\0';
107 strlcpy(u_ent.name, ent->name, sizeof(u_ent.name));
108 u_ent.type = ent->type;
109 u_ent.revision = ent->revision;
110 u_ent.flags = ent->flags;
111 u_ent.group_id = ent->group_id;
112 u_ent.pads = ent->num_pads;
113 u_ent.links = ent->num_links - ent->num_backlinks;
114 memcpy(&u_ent.raw, &ent->info, sizeof(ent->info));
115 if (copy_to_user(uent, &u_ent, sizeof(u_ent)))
120 static void media_device_kpad_to_upad(const struct media_pad *kpad,
121 struct media_pad_desc *upad)
123 upad->entity = kpad->entity->id;
124 upad->index = kpad->index;
125 upad->flags = kpad->flags;
128 static long __media_device_enum_links(struct media_device *mdev,
129 struct media_links_enum *links)
131 struct media_entity *entity;
133 entity = find_entity(mdev, links->entity);
140 for (p = 0; p < entity->num_pads; p++) {
141 struct media_pad_desc pad;
142 media_device_kpad_to_upad(&entity->pads[p], &pad);
143 if (copy_to_user(&links->pads[p], &pad, sizeof(pad)))
149 struct media_link_desc __user *ulink;
152 for (l = 0, ulink = links->links; l < entity->num_links; l++) {
153 struct media_link_desc link;
155 /* Ignore backlinks. */
156 if (entity->links[l].source->entity != entity)
159 media_device_kpad_to_upad(entity->links[l].source,
161 media_device_kpad_to_upad(entity->links[l].sink,
163 link.flags = entity->links[l].flags;
164 if (copy_to_user(ulink, &link, sizeof(*ulink)))
173 static long media_device_enum_links(struct media_device *mdev,
174 struct media_links_enum __user *ulinks)
176 struct media_links_enum links;
179 if (copy_from_user(&links, ulinks, sizeof(links)))
182 rval = __media_device_enum_links(mdev, &links);
186 if (copy_to_user(ulinks, &links, sizeof(*ulinks)))
192 static long media_device_setup_link(struct media_device *mdev,
193 struct media_link_desc __user *_ulink)
195 struct media_link *link = NULL;
196 struct media_link_desc ulink;
197 struct media_entity *source;
198 struct media_entity *sink;
201 if (copy_from_user(&ulink, _ulink, sizeof(ulink)))
204 /* Find the source and sink entities and link.
206 source = find_entity(mdev, ulink.source.entity);
207 sink = find_entity(mdev, ulink.sink.entity);
209 if (source == NULL || sink == NULL)
212 if (ulink.source.index >= source->num_pads ||
213 ulink.sink.index >= sink->num_pads)
216 link = media_entity_find_link(&source->pads[ulink.source.index],
217 &sink->pads[ulink.sink.index]);
221 /* Setup the link on both entities. */
222 ret = __media_entity_setup_link(link, ulink.flags);
224 if (copy_to_user(_ulink, &ulink, sizeof(ulink)))
230 static long media_device_ioctl(struct file *filp, unsigned int cmd,
233 struct media_devnode *devnode = media_devnode_data(filp);
234 struct media_device *dev = to_media_device(devnode);
238 case MEDIA_IOC_DEVICE_INFO:
239 ret = media_device_get_info(dev,
240 (struct media_device_info __user *)arg);
243 case MEDIA_IOC_ENUM_ENTITIES:
244 ret = media_device_enum_entities(dev,
245 (struct media_entity_desc __user *)arg);
248 case MEDIA_IOC_ENUM_LINKS:
249 mutex_lock(&dev->graph_mutex);
250 ret = media_device_enum_links(dev,
251 (struct media_links_enum __user *)arg);
252 mutex_unlock(&dev->graph_mutex);
255 case MEDIA_IOC_SETUP_LINK:
256 mutex_lock(&dev->graph_mutex);
257 ret = media_device_setup_link(dev,
258 (struct media_link_desc __user *)arg);
259 mutex_unlock(&dev->graph_mutex);
271 struct media_links_enum32 {
273 compat_uptr_t pads; /* struct media_pad_desc * */
274 compat_uptr_t links; /* struct media_link_desc * */
278 static long media_device_enum_links32(struct media_device *mdev,
279 struct media_links_enum32 __user *ulinks)
281 struct media_links_enum links;
282 compat_uptr_t pads_ptr, links_ptr;
284 memset(&links, 0, sizeof(links));
286 if (get_user(links.entity, &ulinks->entity)
287 || get_user(pads_ptr, &ulinks->pads)
288 || get_user(links_ptr, &ulinks->links))
291 links.pads = compat_ptr(pads_ptr);
292 links.links = compat_ptr(links_ptr);
294 return __media_device_enum_links(mdev, &links);
297 #define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct media_links_enum32)
299 static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
302 struct media_devnode *devnode = media_devnode_data(filp);
303 struct media_device *dev = to_media_device(devnode);
307 case MEDIA_IOC_DEVICE_INFO:
308 case MEDIA_IOC_ENUM_ENTITIES:
309 case MEDIA_IOC_SETUP_LINK:
310 return media_device_ioctl(filp, cmd, arg);
312 case MEDIA_IOC_ENUM_LINKS32:
313 mutex_lock(&dev->graph_mutex);
314 ret = media_device_enum_links32(dev,
315 (struct media_links_enum32 __user *)arg);
316 mutex_unlock(&dev->graph_mutex);
325 #endif /* CONFIG_COMPAT */
327 static const struct media_file_operations media_device_fops = {
328 .owner = THIS_MODULE,
329 .open = media_device_open,
330 .ioctl = media_device_ioctl,
332 .compat_ioctl = media_device_compat_ioctl,
333 #endif /* CONFIG_COMPAT */
334 .release = media_device_close,
337 /* -----------------------------------------------------------------------------
341 static ssize_t show_model(struct device *cd,
342 struct device_attribute *attr, char *buf)
344 struct media_device *mdev = to_media_device(to_media_devnode(cd));
346 return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
349 static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
351 /* -----------------------------------------------------------------------------
352 * Registration/unregistration
355 static void media_device_release(struct media_devnode *mdev)
360 * media_device_register - register a media device
361 * @mdev: The media device
363 * The caller is responsible for initializing the media device before
364 * registration. The following fields must be set:
366 * - dev must point to the parent device
367 * - model must be filled with the device model name
369 int __must_check media_device_register(struct media_device *mdev)
373 if (WARN_ON(mdev->dev == NULL || mdev->model[0] == 0))
377 INIT_LIST_HEAD(&mdev->entities);
378 spin_lock_init(&mdev->lock);
379 mutex_init(&mdev->graph_mutex);
381 /* Register the device node. */
382 mdev->devnode.fops = &media_device_fops;
383 mdev->devnode.parent = mdev->dev;
384 mdev->devnode.release = media_device_release;
385 ret = media_devnode_register(&mdev->devnode);
389 ret = device_create_file(&mdev->devnode.dev, &dev_attr_model);
391 media_devnode_unregister(&mdev->devnode);
397 EXPORT_SYMBOL_GPL(media_device_register);
400 * media_device_unregister - unregister a media device
401 * @mdev: The media device
404 void media_device_unregister(struct media_device *mdev)
406 struct media_entity *entity;
407 struct media_entity *next;
409 list_for_each_entry_safe(entity, next, &mdev->entities, list)
410 media_device_unregister_entity(entity);
412 device_remove_file(&mdev->devnode.dev, &dev_attr_model);
413 media_devnode_unregister(&mdev->devnode);
415 EXPORT_SYMBOL_GPL(media_device_unregister);
418 * media_device_register_entity - Register an entity with a media device
419 * @mdev: The media device
420 * @entity: The entity
422 int __must_check media_device_register_entity(struct media_device *mdev,
423 struct media_entity *entity)
425 /* Warn if we apparently re-register an entity */
426 WARN_ON(entity->parent != NULL);
427 entity->parent = mdev;
429 spin_lock(&mdev->lock);
431 entity->id = mdev->entity_id++;
433 mdev->entity_id = max(entity->id + 1, mdev->entity_id);
434 list_add_tail(&entity->list, &mdev->entities);
435 spin_unlock(&mdev->lock);
439 EXPORT_SYMBOL_GPL(media_device_register_entity);
442 * media_device_unregister_entity - Unregister an entity
443 * @entity: The entity
445 * If the entity has never been registered this function will return
448 void media_device_unregister_entity(struct media_entity *entity)
450 struct media_device *mdev = entity->parent;
455 spin_lock(&mdev->lock);
456 list_del(&entity->list);
457 spin_unlock(&mdev->lock);
458 entity->parent = NULL;
460 EXPORT_SYMBOL_GPL(media_device_unregister_entity);