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/types.h>
24 #include <linux/ioctl.h>
25 #include <linux/media.h>
26 #include <linux/export.h>
28 #include <media/media-device.h>
29 #include <media/media-devnode.h>
30 #include <media/media-entity.h>
32 /* -----------------------------------------------------------------------------
36 static int media_device_open(struct file *filp)
41 static int media_device_close(struct file *filp)
46 static int media_device_get_info(struct media_device *dev,
47 struct media_device_info __user *__info)
49 struct media_device_info info;
51 memset(&info, 0, sizeof(info));
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));
58 info.media_version = MEDIA_API_VERSION;
59 info.hw_revision = dev->hw_revision;
60 info.driver_version = dev->driver_version;
62 return copy_to_user(__info, &info, sizeof(*__info));
65 static struct media_entity *find_entity(struct media_device *mdev, u32 id)
67 struct media_entity *entity;
68 int next = id & MEDIA_ENT_ID_FLAG_NEXT;
70 id &= ~MEDIA_ENT_ID_FLAG_NEXT;
72 spin_lock(&mdev->lock);
74 media_device_for_each_entity(entity, mdev) {
75 if ((entity->id == id && !next) ||
76 (entity->id > id && next)) {
77 spin_unlock(&mdev->lock);
82 spin_unlock(&mdev->lock);
87 static long media_device_enum_entities(struct media_device *mdev,
88 struct media_entity_desc __user *uent)
90 struct media_entity *ent;
91 struct media_entity_desc u_ent;
93 memset(&u_ent, 0, sizeof(u_ent));
94 if (copy_from_user(&u_ent.id, &uent->id, sizeof(u_ent.id)))
97 ent = find_entity(mdev, u_ent.id);
103 u_ent.name[0] = '\0';
105 strlcpy(u_ent.name, ent->name, sizeof(u_ent.name));
106 u_ent.type = ent->type;
107 u_ent.revision = ent->revision;
108 u_ent.flags = ent->flags;
109 u_ent.group_id = ent->group_id;
110 u_ent.pads = ent->num_pads;
111 u_ent.links = ent->num_links - ent->num_backlinks;
112 u_ent.v4l.major = ent->v4l.major;
113 u_ent.v4l.minor = ent->v4l.minor;
114 if (copy_to_user(uent, &u_ent, sizeof(u_ent)))
119 static void media_device_kpad_to_upad(const struct media_pad *kpad,
120 struct media_pad_desc *upad)
122 upad->entity = kpad->entity->id;
123 upad->index = kpad->index;
124 upad->flags = kpad->flags;
127 static long media_device_enum_links(struct media_device *mdev,
128 struct media_links_enum __user *ulinks)
130 struct media_entity *entity;
131 struct media_links_enum links;
133 if (copy_from_user(&links, ulinks, sizeof(links)))
136 entity = find_entity(mdev, links.entity);
143 for (p = 0; p < entity->num_pads; p++) {
144 struct media_pad_desc pad;
146 memset(&pad, 0, sizeof(pad));
147 media_device_kpad_to_upad(&entity->pads[p], &pad);
148 if (copy_to_user(&links.pads[p], &pad, sizeof(pad)))
154 struct media_link_desc __user *ulink;
157 for (l = 0, ulink = links.links; l < entity->num_links; l++) {
158 struct media_link_desc link;
160 /* Ignore backlinks. */
161 if (entity->links[l].source->entity != entity)
164 memset(&link, 0, sizeof(link));
165 media_device_kpad_to_upad(entity->links[l].source,
167 media_device_kpad_to_upad(entity->links[l].sink,
169 link.flags = entity->links[l].flags;
170 if (copy_to_user(ulink, &link, sizeof(*ulink)))
175 if (copy_to_user(ulinks, &links, sizeof(*ulinks)))
180 static long media_device_setup_link(struct media_device *mdev,
181 struct media_link_desc __user *_ulink)
183 struct media_link *link = NULL;
184 struct media_link_desc ulink;
185 struct media_entity *source;
186 struct media_entity *sink;
189 if (copy_from_user(&ulink, _ulink, sizeof(ulink)))
192 /* Find the source and sink entities and link.
194 source = find_entity(mdev, ulink.source.entity);
195 sink = find_entity(mdev, ulink.sink.entity);
197 if (source == NULL || sink == NULL)
200 if (ulink.source.index >= source->num_pads ||
201 ulink.sink.index >= sink->num_pads)
204 link = media_entity_find_link(&source->pads[ulink.source.index],
205 &sink->pads[ulink.sink.index]);
209 /* Setup the link on both entities. */
210 ret = __media_entity_setup_link(link, ulink.flags);
212 if (copy_to_user(_ulink, &ulink, sizeof(ulink)))
218 static long media_device_ioctl(struct file *filp, unsigned int cmd,
221 struct media_devnode *devnode = media_devnode_data(filp);
222 struct media_device *dev = to_media_device(devnode);
226 case MEDIA_IOC_DEVICE_INFO:
227 ret = media_device_get_info(dev,
228 (struct media_device_info __user *)arg);
231 case MEDIA_IOC_ENUM_ENTITIES:
232 ret = media_device_enum_entities(dev,
233 (struct media_entity_desc __user *)arg);
236 case MEDIA_IOC_ENUM_LINKS:
237 mutex_lock(&dev->graph_mutex);
238 ret = media_device_enum_links(dev,
239 (struct media_links_enum __user *)arg);
240 mutex_unlock(&dev->graph_mutex);
243 case MEDIA_IOC_SETUP_LINK:
244 mutex_lock(&dev->graph_mutex);
245 ret = media_device_setup_link(dev,
246 (struct media_link_desc __user *)arg);
247 mutex_unlock(&dev->graph_mutex);
257 static const struct media_file_operations media_device_fops = {
258 .owner = THIS_MODULE,
259 .open = media_device_open,
260 .ioctl = media_device_ioctl,
261 .release = media_device_close,
264 /* -----------------------------------------------------------------------------
268 static ssize_t show_model(struct device *cd,
269 struct device_attribute *attr, char *buf)
271 struct media_device *mdev = to_media_device(to_media_devnode(cd));
273 return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
276 static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
278 /* -----------------------------------------------------------------------------
279 * Registration/unregistration
282 static void media_device_release(struct media_devnode *mdev)
287 * media_device_register - register a media device
288 * @mdev: The media device
290 * The caller is responsible for initializing the media device before
291 * registration. The following fields must be set:
293 * - dev must point to the parent device
294 * - model must be filled with the device model name
296 int __must_check media_device_register(struct media_device *mdev)
300 if (WARN_ON(mdev->dev == NULL || mdev->model[0] == 0))
304 INIT_LIST_HEAD(&mdev->entities);
305 spin_lock_init(&mdev->lock);
306 mutex_init(&mdev->graph_mutex);
308 /* Register the device node. */
309 mdev->devnode.fops = &media_device_fops;
310 mdev->devnode.parent = mdev->dev;
311 mdev->devnode.release = media_device_release;
312 ret = media_devnode_register(&mdev->devnode);
316 ret = device_create_file(&mdev->devnode.dev, &dev_attr_model);
318 media_devnode_unregister(&mdev->devnode);
324 EXPORT_SYMBOL_GPL(media_device_register);
327 * media_device_unregister - unregister a media device
328 * @mdev: The media device
331 void media_device_unregister(struct media_device *mdev)
333 struct media_entity *entity;
334 struct media_entity *next;
336 list_for_each_entry_safe(entity, next, &mdev->entities, list)
337 media_device_unregister_entity(entity);
339 device_remove_file(&mdev->devnode.dev, &dev_attr_model);
340 media_devnode_unregister(&mdev->devnode);
342 EXPORT_SYMBOL_GPL(media_device_unregister);
345 * media_device_register_entity - Register an entity with a media device
346 * @mdev: The media device
347 * @entity: The entity
349 int __must_check media_device_register_entity(struct media_device *mdev,
350 struct media_entity *entity)
352 /* Warn if we apparently re-register an entity */
353 WARN_ON(entity->parent != NULL);
354 entity->parent = mdev;
356 spin_lock(&mdev->lock);
358 entity->id = mdev->entity_id++;
360 mdev->entity_id = max(entity->id + 1, mdev->entity_id);
361 list_add_tail(&entity->list, &mdev->entities);
362 spin_unlock(&mdev->lock);
366 EXPORT_SYMBOL_GPL(media_device_register_entity);
369 * media_device_unregister_entity - Unregister an entity
370 * @entity: The entity
372 * If the entity has never been registered this function will return
375 void media_device_unregister_entity(struct media_entity *entity)
377 struct media_device *mdev = entity->parent;
382 spin_lock(&mdev->lock);
383 list_del(&entity->list);
384 spin_unlock(&mdev->lock);
385 entity->parent = NULL;
387 EXPORT_SYMBOL_GPL(media_device_unregister_entity);