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 #ifdef CONFIG_MEDIA_CONTROLLER
35 /* -----------------------------------------------------------------------------
39 static int media_device_open(struct file *filp)
44 static int media_device_close(struct file *filp)
49 static int media_device_get_info(struct media_device *dev,
50 struct media_device_info __user *__info)
52 struct media_device_info info;
54 memset(&info, 0, sizeof(info));
56 strlcpy(info.driver, dev->dev->driver->name, sizeof(info.driver));
57 strlcpy(info.model, dev->model, sizeof(info.model));
58 strlcpy(info.serial, dev->serial, sizeof(info.serial));
59 strlcpy(info.bus_info, dev->bus_info, sizeof(info.bus_info));
61 info.media_version = MEDIA_API_VERSION;
62 info.hw_revision = dev->hw_revision;
63 info.driver_version = dev->driver_version;
65 if (copy_to_user(__info, &info, sizeof(*__info)))
70 static struct media_entity *find_entity(struct media_device *mdev, u32 id)
72 struct media_entity *entity;
73 int next = id & MEDIA_ENT_ID_FLAG_NEXT;
75 id &= ~MEDIA_ENT_ID_FLAG_NEXT;
77 spin_lock(&mdev->lock);
79 media_device_for_each_entity(entity, mdev) {
80 if (((media_entity_id(entity) == id) && !next) ||
81 ((media_entity_id(entity) > id) && next)) {
82 spin_unlock(&mdev->lock);
87 spin_unlock(&mdev->lock);
92 static long media_device_enum_entities(struct media_device *mdev,
93 struct media_entity_desc __user *uent)
95 struct media_entity *ent;
96 struct media_entity_desc u_ent;
98 memset(&u_ent, 0, sizeof(u_ent));
99 if (copy_from_user(&u_ent.id, &uent->id, sizeof(u_ent.id)))
102 ent = find_entity(mdev, u_ent.id);
107 u_ent.id = media_entity_id(ent);
109 strlcpy(u_ent.name, ent->name, sizeof(u_ent.name));
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;
116 memcpy(&u_ent.raw, &ent->info, sizeof(ent->info));
117 if (copy_to_user(uent, &u_ent, sizeof(u_ent)))
122 static void media_device_kpad_to_upad(const struct media_pad *kpad,
123 struct media_pad_desc *upad)
125 upad->entity = media_entity_id(kpad->entity);
126 upad->index = kpad->index;
127 upad->flags = kpad->flags;
130 static long __media_device_enum_links(struct media_device *mdev,
131 struct media_links_enum *links)
133 struct media_entity *entity;
135 entity = find_entity(mdev, links->entity);
142 for (p = 0; p < entity->num_pads; p++) {
143 struct media_pad_desc pad;
145 memset(&pad, 0, sizeof(pad));
146 media_device_kpad_to_upad(&entity->pads[p], &pad);
147 if (copy_to_user(&links->pads[p], &pad, sizeof(pad)))
153 struct media_link_desc __user *ulink;
156 for (l = 0, ulink = links->links; l < entity->num_links; l++) {
157 struct media_link_desc link;
159 /* Ignore backlinks. */
160 if (entity->links[l].source->entity != entity)
163 memset(&link, 0, sizeof(link));
164 media_device_kpad_to_upad(entity->links[l].source,
166 media_device_kpad_to_upad(entity->links[l].sink,
168 link.flags = entity->links[l].flags;
169 if (copy_to_user(ulink, &link, sizeof(*ulink)))
178 static long media_device_enum_links(struct media_device *mdev,
179 struct media_links_enum __user *ulinks)
181 struct media_links_enum links;
184 if (copy_from_user(&links, ulinks, sizeof(links)))
187 rval = __media_device_enum_links(mdev, &links);
191 if (copy_to_user(ulinks, &links, sizeof(*ulinks)))
197 static long media_device_setup_link(struct media_device *mdev,
198 struct media_link_desc __user *_ulink)
200 struct media_link *link = NULL;
201 struct media_link_desc ulink;
202 struct media_entity *source;
203 struct media_entity *sink;
206 if (copy_from_user(&ulink, _ulink, sizeof(ulink)))
209 /* Find the source and sink entities and link.
211 source = find_entity(mdev, ulink.source.entity);
212 sink = find_entity(mdev, ulink.sink.entity);
214 if (source == NULL || sink == NULL)
217 if (ulink.source.index >= source->num_pads ||
218 ulink.sink.index >= sink->num_pads)
221 link = media_entity_find_link(&source->pads[ulink.source.index],
222 &sink->pads[ulink.sink.index]);
226 /* Setup the link on both entities. */
227 ret = __media_entity_setup_link(link, ulink.flags);
229 if (copy_to_user(_ulink, &ulink, sizeof(ulink)))
235 static long media_device_ioctl(struct file *filp, unsigned int cmd,
238 struct media_devnode *devnode = media_devnode_data(filp);
239 struct media_device *dev = to_media_device(devnode);
243 case MEDIA_IOC_DEVICE_INFO:
244 ret = media_device_get_info(dev,
245 (struct media_device_info __user *)arg);
248 case MEDIA_IOC_ENUM_ENTITIES:
249 ret = media_device_enum_entities(dev,
250 (struct media_entity_desc __user *)arg);
253 case MEDIA_IOC_ENUM_LINKS:
254 mutex_lock(&dev->graph_mutex);
255 ret = media_device_enum_links(dev,
256 (struct media_links_enum __user *)arg);
257 mutex_unlock(&dev->graph_mutex);
260 case MEDIA_IOC_SETUP_LINK:
261 mutex_lock(&dev->graph_mutex);
262 ret = media_device_setup_link(dev,
263 (struct media_link_desc __user *)arg);
264 mutex_unlock(&dev->graph_mutex);
276 struct media_links_enum32 {
278 compat_uptr_t pads; /* struct media_pad_desc * */
279 compat_uptr_t links; /* struct media_link_desc * */
283 static long media_device_enum_links32(struct media_device *mdev,
284 struct media_links_enum32 __user *ulinks)
286 struct media_links_enum links;
287 compat_uptr_t pads_ptr, links_ptr;
289 memset(&links, 0, sizeof(links));
291 if (get_user(links.entity, &ulinks->entity)
292 || get_user(pads_ptr, &ulinks->pads)
293 || get_user(links_ptr, &ulinks->links))
296 links.pads = compat_ptr(pads_ptr);
297 links.links = compat_ptr(links_ptr);
299 return __media_device_enum_links(mdev, &links);
302 #define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct media_links_enum32)
304 static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
307 struct media_devnode *devnode = media_devnode_data(filp);
308 struct media_device *dev = to_media_device(devnode);
312 case MEDIA_IOC_DEVICE_INFO:
313 case MEDIA_IOC_ENUM_ENTITIES:
314 case MEDIA_IOC_SETUP_LINK:
315 return media_device_ioctl(filp, cmd, arg);
317 case MEDIA_IOC_ENUM_LINKS32:
318 mutex_lock(&dev->graph_mutex);
319 ret = media_device_enum_links32(dev,
320 (struct media_links_enum32 __user *)arg);
321 mutex_unlock(&dev->graph_mutex);
330 #endif /* CONFIG_COMPAT */
332 static const struct media_file_operations media_device_fops = {
333 .owner = THIS_MODULE,
334 .open = media_device_open,
335 .ioctl = media_device_ioctl,
337 .compat_ioctl = media_device_compat_ioctl,
338 #endif /* CONFIG_COMPAT */
339 .release = media_device_close,
342 /* -----------------------------------------------------------------------------
346 static ssize_t show_model(struct device *cd,
347 struct device_attribute *attr, char *buf)
349 struct media_device *mdev = to_media_device(to_media_devnode(cd));
351 return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
354 static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
356 /* -----------------------------------------------------------------------------
357 * Registration/unregistration
360 static void media_device_release(struct media_devnode *mdev)
365 * media_device_register - register a media device
366 * @mdev: The media device
368 * The caller is responsible for initializing the media device before
369 * registration. The following fields must be set:
371 * - dev must point to the parent device
372 * - model must be filled with the device model name
374 int __must_check __media_device_register(struct media_device *mdev,
375 struct module *owner)
379 if (WARN_ON(mdev->dev == NULL || mdev->model[0] == 0))
382 INIT_LIST_HEAD(&mdev->entities);
383 spin_lock_init(&mdev->lock);
384 mutex_init(&mdev->graph_mutex);
386 /* Register the device node. */
387 mdev->devnode.fops = &media_device_fops;
388 mdev->devnode.parent = mdev->dev;
389 mdev->devnode.release = media_device_release;
390 ret = media_devnode_register(&mdev->devnode, owner);
394 ret = device_create_file(&mdev->devnode.dev, &dev_attr_model);
396 media_devnode_unregister(&mdev->devnode);
402 EXPORT_SYMBOL_GPL(__media_device_register);
405 * media_device_unregister - unregister a media device
406 * @mdev: The media device
409 void media_device_unregister(struct media_device *mdev)
411 struct media_entity *entity;
412 struct media_entity *next;
414 list_for_each_entry_safe(entity, next, &mdev->entities, list)
415 media_device_unregister_entity(entity);
417 device_remove_file(&mdev->devnode.dev, &dev_attr_model);
418 media_devnode_unregister(&mdev->devnode);
420 EXPORT_SYMBOL_GPL(media_device_unregister);
423 * media_device_register_entity - Register an entity with a media device
424 * @mdev: The media device
425 * @entity: The entity
427 int __must_check media_device_register_entity(struct media_device *mdev,
428 struct media_entity *entity)
432 /* Warn if we apparently re-register an entity */
433 WARN_ON(entity->parent != NULL);
434 entity->parent = mdev;
436 spin_lock(&mdev->lock);
437 /* Initialize media_gobj embedded at the entity */
438 media_gobj_init(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
439 list_add_tail(&entity->list, &mdev->entities);
442 * Initialize objects at the links
443 * in the case where links got created before entity register
445 for (i = 0; i < entity->num_links; i++)
446 media_gobj_init(mdev, MEDIA_GRAPH_LINK,
447 &entity->links[i].graph_obj);
448 /* Initialize objects at the pads */
449 for (i = 0; i < entity->num_pads; i++)
450 media_gobj_init(mdev, MEDIA_GRAPH_PAD,
451 &entity->pads[i].graph_obj);
453 spin_unlock(&mdev->lock);
457 EXPORT_SYMBOL_GPL(media_device_register_entity);
460 * media_device_unregister_entity - Unregister an entity
461 * @entity: The entity
463 * If the entity has never been registered this function will return
466 void media_device_unregister_entity(struct media_entity *entity)
469 struct media_device *mdev = entity->parent;
474 spin_lock(&mdev->lock);
475 for (i = 0; i < entity->num_links; i++)
476 media_gobj_remove(&entity->links[i].graph_obj);
477 for (i = 0; i < entity->num_pads; i++)
478 media_gobj_remove(&entity->pads[i].graph_obj);
479 media_gobj_remove(&entity->graph_obj);
480 list_del(&entity->list);
481 spin_unlock(&mdev->lock);
482 entity->parent = NULL;
484 EXPORT_SYMBOL_GPL(media_device_unregister_entity);
486 static void media_device_release_devres(struct device *dev, void *res)
491 * media_device_get_devres() - get media device as device resource
492 * creates if one doesn't exist
494 struct media_device *media_device_get_devres(struct device *dev)
496 struct media_device *mdev;
498 mdev = devres_find(dev, media_device_release_devres, NULL, NULL);
502 mdev = devres_alloc(media_device_release_devres,
503 sizeof(struct media_device), GFP_KERNEL);
506 return devres_get(dev, mdev, NULL, NULL);
508 EXPORT_SYMBOL_GPL(media_device_get_devres);
511 * media_device_find_devres() - find media device as device resource
513 struct media_device *media_device_find_devres(struct device *dev)
515 return devres_find(dev, media_device_release_devres, NULL, NULL);
517 EXPORT_SYMBOL_GPL(media_device_find_devres);
519 #endif /* CONFIG_MEDIA_CONTROLLER */