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>
28 #include <linux/slab.h>
30 #include <media/media-device.h>
31 #include <media/media-devnode.h>
32 #include <media/media-entity.h>
34 #ifdef CONFIG_MEDIA_CONTROLLER
36 /* -----------------------------------------------------------------------------
40 static int media_device_open(struct file *filp)
45 static int media_device_close(struct file *filp)
50 static int media_device_get_info(struct media_device *dev,
51 struct media_device_info __user *__info)
53 struct media_device_info info;
55 memset(&info, 0, sizeof(info));
57 strlcpy(info.driver, dev->dev->driver->name, sizeof(info.driver));
58 strlcpy(info.model, dev->model, sizeof(info.model));
59 strlcpy(info.serial, dev->serial, sizeof(info.serial));
60 strlcpy(info.bus_info, dev->bus_info, sizeof(info.bus_info));
62 info.media_version = MEDIA_API_VERSION;
63 info.hw_revision = dev->hw_revision;
64 info.driver_version = dev->driver_version;
66 if (copy_to_user(__info, &info, sizeof(*__info)))
71 static struct media_entity *find_entity(struct media_device *mdev, u32 id)
73 struct media_entity *entity;
74 int next = id & MEDIA_ENT_ID_FLAG_NEXT;
76 id &= ~MEDIA_ENT_ID_FLAG_NEXT;
78 spin_lock(&mdev->lock);
80 media_device_for_each_entity(entity, mdev) {
81 if (((media_entity_id(entity) == id) && !next) ||
82 ((media_entity_id(entity) > id) && next)) {
83 spin_unlock(&mdev->lock);
88 spin_unlock(&mdev->lock);
93 static long media_device_enum_entities(struct media_device *mdev,
94 struct media_entity_desc __user *uent)
96 struct media_entity *ent;
97 struct media_entity_desc u_ent;
99 memset(&u_ent, 0, sizeof(u_ent));
100 if (copy_from_user(&u_ent.id, &uent->id, sizeof(u_ent.id)))
103 ent = find_entity(mdev, u_ent.id);
108 u_ent.id = media_entity_id(ent);
110 strlcpy(u_ent.name, ent->name, sizeof(u_ent.name));
111 u_ent.type = ent->type;
112 u_ent.revision = ent->revision;
113 u_ent.flags = ent->flags;
114 u_ent.group_id = ent->group_id;
115 u_ent.pads = ent->num_pads;
116 u_ent.links = ent->num_links - ent->num_backlinks;
117 memcpy(&u_ent.raw, &ent->info, sizeof(ent->info));
118 if (copy_to_user(uent, &u_ent, sizeof(u_ent)))
123 static void media_device_kpad_to_upad(const struct media_pad *kpad,
124 struct media_pad_desc *upad)
126 upad->entity = media_entity_id(kpad->entity);
127 upad->index = kpad->index;
128 upad->flags = kpad->flags;
131 static long __media_device_enum_links(struct media_device *mdev,
132 struct media_links_enum *links)
134 struct media_entity *entity;
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 *ent_link;
155 struct media_link_desc __user *ulink = links->links;
157 list_for_each_entry(ent_link, &entity->links, list) {
158 struct media_link_desc link;
160 /* Ignore backlinks. */
161 if (ent_link->source->entity != entity)
163 memset(&link, 0, sizeof(link));
164 media_device_kpad_to_upad(ent_link->source,
166 media_device_kpad_to_upad(ent_link->sink,
168 link.flags = ent_link->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_get_topology(struct media_device *mdev,
236 struct media_v2_topology *topo)
238 struct media_entity *entity;
239 struct media_interface *intf;
240 struct media_pad *pad;
241 struct media_link *link;
242 struct media_v2_entity uentity;
243 struct media_v2_interface uintf;
244 struct media_v2_pad upad;
245 struct media_v2_link ulink;
248 topo->topology_version = mdev->topology_version;
250 /* Get entities and number of entities */
252 media_device_for_each_entity(entity, mdev) {
255 if (ret || !topo->entities)
258 if (i > topo->num_entities) {
263 /* Copy fields to userspace struct if not error */
264 memset(&uentity, 0, sizeof(uentity));
265 uentity.id = entity->graph_obj.id;
266 strncpy(uentity.name, entity->name,
267 sizeof(uentity.name));
269 if (copy_to_user(&topo->entities[i - 1], &uentity, sizeof(uentity)))
272 topo->num_entities = i;
274 /* Get interfaces and number of interfaces */
276 media_device_for_each_intf(intf, mdev) {
279 if (ret || !topo->interfaces)
282 if (i > topo->num_interfaces) {
287 memset(&uintf, 0, sizeof(uintf));
289 /* Copy intf fields to userspace struct */
290 uintf.id = intf->graph_obj.id;
291 uintf.intf_type = intf->type;
292 uintf.flags = intf->flags;
294 if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {
295 struct media_intf_devnode *devnode;
297 devnode = intf_to_devnode(intf);
299 uintf.devnode.major = devnode->major;
300 uintf.devnode.minor = devnode->minor;
303 if (copy_to_user(&topo->interfaces[i - 1], &uintf, sizeof(uintf)))
306 topo->num_interfaces = i;
308 /* Get pads and number of pads */
310 media_device_for_each_pad(pad, mdev) {
313 if (ret || !topo->pads)
316 if (i > topo->num_pads) {
321 memset(&upad, 0, sizeof(upad));
323 /* Copy pad fields to userspace struct */
324 upad.id = pad->graph_obj.id;
325 upad.entity_id = pad->entity->graph_obj.id;
326 upad.flags = pad->flags;
328 if (copy_to_user(&topo->pads[i - 1], &upad, sizeof(upad)))
333 /* Get links and number of links */
335 media_device_for_each_link(link, mdev) {
338 if (ret || !topo->links)
341 if (i > topo->num_links) {
346 memset(&ulink, 0, sizeof(ulink));
348 /* Copy link fields to userspace struct */
349 ulink.id = link->graph_obj.id;
350 ulink.source_id = link->gobj0->id;
351 ulink.sink_id = link->gobj1->id;
352 ulink.flags = link->flags;
354 if (media_type(link->gobj0) != MEDIA_GRAPH_PAD)
355 ulink.flags |= MEDIA_LNK_FL_INTERFACE_LINK;
357 if (copy_to_user(&topo->links[i - 1], &ulink, sizeof(ulink)))
365 static long media_device_get_topology(struct media_device *mdev,
366 struct media_v2_topology __user *utopo)
368 struct media_v2_topology ktopo;
371 ret = copy_from_user(&ktopo, utopo, sizeof(ktopo));
376 ret = __media_device_get_topology(mdev, &ktopo);
380 ret = copy_to_user(utopo, &ktopo, sizeof(*utopo));
385 static long media_device_ioctl(struct file *filp, unsigned int cmd,
388 struct media_devnode *devnode = media_devnode_data(filp);
389 struct media_device *dev = to_media_device(devnode);
393 case MEDIA_IOC_DEVICE_INFO:
394 ret = media_device_get_info(dev,
395 (struct media_device_info __user *)arg);
398 case MEDIA_IOC_ENUM_ENTITIES:
399 ret = media_device_enum_entities(dev,
400 (struct media_entity_desc __user *)arg);
403 case MEDIA_IOC_ENUM_LINKS:
404 mutex_lock(&dev->graph_mutex);
405 ret = media_device_enum_links(dev,
406 (struct media_links_enum __user *)arg);
407 mutex_unlock(&dev->graph_mutex);
410 case MEDIA_IOC_SETUP_LINK:
411 mutex_lock(&dev->graph_mutex);
412 ret = media_device_setup_link(dev,
413 (struct media_link_desc __user *)arg);
414 mutex_unlock(&dev->graph_mutex);
417 case MEDIA_IOC_G_TOPOLOGY:
418 mutex_lock(&dev->graph_mutex);
419 ret = media_device_get_topology(dev,
420 (struct media_v2_topology __user *)arg);
421 mutex_unlock(&dev->graph_mutex);
433 struct media_links_enum32 {
435 compat_uptr_t pads; /* struct media_pad_desc * */
436 compat_uptr_t links; /* struct media_link_desc * */
440 static long media_device_enum_links32(struct media_device *mdev,
441 struct media_links_enum32 __user *ulinks)
443 struct media_links_enum links;
444 compat_uptr_t pads_ptr, links_ptr;
446 memset(&links, 0, sizeof(links));
448 if (get_user(links.entity, &ulinks->entity)
449 || get_user(pads_ptr, &ulinks->pads)
450 || get_user(links_ptr, &ulinks->links))
453 links.pads = compat_ptr(pads_ptr);
454 links.links = compat_ptr(links_ptr);
456 return __media_device_enum_links(mdev, &links);
459 #define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct media_links_enum32)
461 static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
464 struct media_devnode *devnode = media_devnode_data(filp);
465 struct media_device *dev = to_media_device(devnode);
469 case MEDIA_IOC_DEVICE_INFO:
470 case MEDIA_IOC_ENUM_ENTITIES:
471 case MEDIA_IOC_SETUP_LINK:
472 case MEDIA_IOC_G_TOPOLOGY:
473 return media_device_ioctl(filp, cmd, arg);
475 case MEDIA_IOC_ENUM_LINKS32:
476 mutex_lock(&dev->graph_mutex);
477 ret = media_device_enum_links32(dev,
478 (struct media_links_enum32 __user *)arg);
479 mutex_unlock(&dev->graph_mutex);
488 #endif /* CONFIG_COMPAT */
490 static const struct media_file_operations media_device_fops = {
491 .owner = THIS_MODULE,
492 .open = media_device_open,
493 .ioctl = media_device_ioctl,
495 .compat_ioctl = media_device_compat_ioctl,
496 #endif /* CONFIG_COMPAT */
497 .release = media_device_close,
500 /* -----------------------------------------------------------------------------
504 static ssize_t show_model(struct device *cd,
505 struct device_attribute *attr, char *buf)
507 struct media_device *mdev = to_media_device(to_media_devnode(cd));
509 return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
512 static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
514 /* -----------------------------------------------------------------------------
515 * Registration/unregistration
518 static void media_device_release(struct media_devnode *mdev)
520 dev_dbg(mdev->parent, "Media device released\n");
524 * media_device_register - register a media device
525 * @mdev: The media device
527 * The caller is responsible for initializing the media device before
528 * registration. The following fields must be set:
530 * - dev must point to the parent device
531 * - model must be filled with the device model name
533 int __must_check __media_device_register(struct media_device *mdev,
534 struct module *owner)
538 if (WARN_ON(mdev->dev == NULL || mdev->model[0] == 0))
541 INIT_LIST_HEAD(&mdev->entities);
542 INIT_LIST_HEAD(&mdev->interfaces);
543 INIT_LIST_HEAD(&mdev->pads);
544 INIT_LIST_HEAD(&mdev->links);
545 spin_lock_init(&mdev->lock);
546 mutex_init(&mdev->graph_mutex);
548 /* Register the device node. */
549 mdev->devnode.fops = &media_device_fops;
550 mdev->devnode.parent = mdev->dev;
551 mdev->devnode.release = media_device_release;
552 ret = media_devnode_register(&mdev->devnode, owner);
556 ret = device_create_file(&mdev->devnode.dev, &dev_attr_model);
558 media_devnode_unregister(&mdev->devnode);
562 dev_dbg(mdev->dev, "Media device registered\n");
566 EXPORT_SYMBOL_GPL(__media_device_register);
569 * media_device_unregister - unregister a media device
570 * @mdev: The media device
573 void media_device_unregister(struct media_device *mdev)
575 struct media_entity *entity;
576 struct media_entity *next;
577 struct media_interface *intf, *tmp_intf;
579 /* Remove all interfaces from the media device */
580 spin_lock(&mdev->lock);
581 list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,
583 __media_remove_intf_links(intf);
584 media_gobj_remove(&intf->graph_obj);
587 spin_unlock(&mdev->lock);
589 list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)
590 media_device_unregister_entity(entity);
592 device_remove_file(&mdev->devnode.dev, &dev_attr_model);
593 media_devnode_unregister(&mdev->devnode);
595 dev_dbg(mdev->dev, "Media device unregistered\n");
597 EXPORT_SYMBOL_GPL(media_device_unregister);
600 * media_device_register_entity - Register an entity with a media device
601 * @mdev: The media device
602 * @entity: The entity
604 int __must_check media_device_register_entity(struct media_device *mdev,
605 struct media_entity *entity)
609 if (entity->type == MEDIA_ENT_T_V4L2_SUBDEV_UNKNOWN ||
610 entity->type == MEDIA_ENT_T_UNKNOWN)
612 "Entity type for entity %s was not initialized!\n",
615 /* Warn if we apparently re-register an entity */
616 WARN_ON(entity->graph_obj.mdev != NULL);
617 entity->graph_obj.mdev = mdev;
618 INIT_LIST_HEAD(&entity->links);
620 spin_lock(&mdev->lock);
621 /* Initialize media_gobj embedded at the entity */
622 media_gobj_init(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
624 /* Initialize objects at the pads */
625 for (i = 0; i < entity->num_pads; i++)
626 media_gobj_init(mdev, MEDIA_GRAPH_PAD,
627 &entity->pads[i].graph_obj);
629 spin_unlock(&mdev->lock);
633 EXPORT_SYMBOL_GPL(media_device_register_entity);
636 * media_device_unregister_entity - Unregister an entity
637 * @entity: The entity
639 * If the entity has never been registered this function will return
642 void media_device_unregister_entity(struct media_entity *entity)
645 struct media_device *mdev = entity->graph_obj.mdev;
646 struct media_link *link, *tmp;
647 struct media_interface *intf;
652 spin_lock(&mdev->lock);
654 /* Remove all interface links pointing to this entity */
655 list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) {
656 list_for_each_entry_safe(link, tmp, &intf->links, list) {
657 if (media_type(link->gobj1) == MEDIA_GRAPH_ENTITY
658 && link->entity == entity)
659 __media_remove_intf_link(link);
663 /* Remove all data links that belong to this entity */
664 __media_entity_remove_links(entity);
666 /* Remove all pads that belong to this entity */
667 for (i = 0; i < entity->num_pads; i++)
668 media_gobj_remove(&entity->pads[i].graph_obj);
670 /* Remove the entity */
671 media_gobj_remove(&entity->graph_obj);
673 spin_unlock(&mdev->lock);
674 entity->graph_obj.mdev = NULL;
676 EXPORT_SYMBOL_GPL(media_device_unregister_entity);
678 static void media_device_release_devres(struct device *dev, void *res)
683 * media_device_get_devres() - get media device as device resource
684 * creates if one doesn't exist
686 struct media_device *media_device_get_devres(struct device *dev)
688 struct media_device *mdev;
690 mdev = devres_find(dev, media_device_release_devres, NULL, NULL);
694 mdev = devres_alloc(media_device_release_devres,
695 sizeof(struct media_device), GFP_KERNEL);
698 return devres_get(dev, mdev, NULL, NULL);
700 EXPORT_SYMBOL_GPL(media_device_get_devres);
703 * media_device_find_devres() - find media device as device resource
705 struct media_device *media_device_find_devres(struct device *dev)
707 return devres_find(dev, media_device_release_devres, NULL, NULL);
709 EXPORT_SYMBOL_GPL(media_device_find_devres);
711 #endif /* CONFIG_MEDIA_CONTROLLER */