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.
19 /* We need to access legacy defines from linux/media.h */
20 #define __NEED_MEDIA_LEGACY_API
22 #include <linux/compat.h>
23 #include <linux/export.h>
24 #include <linux/idr.h>
25 #include <linux/ioctl.h>
26 #include <linux/media.h>
27 #include <linux/slab.h>
28 #include <linux/types.h>
29 #include <linux/pci.h>
30 #include <linux/usb.h>
32 #include <media/media-device.h>
33 #include <media/media-devnode.h>
34 #include <media/media-entity.h>
36 #ifdef CONFIG_MEDIA_CONTROLLER
38 /* -----------------------------------------------------------------------------
42 static inline void __user *media_get_uptr(__u64 arg)
44 return (void __user *)(uintptr_t)arg;
47 static int media_device_open(struct file *filp)
52 static int media_device_close(struct file *filp)
57 static int media_device_get_info(struct media_device *dev,
58 struct media_device_info *info)
60 memset(info, 0, sizeof(*info));
62 if (dev->driver_name[0])
63 strlcpy(info->driver, dev->driver_name, sizeof(info->driver));
65 strlcpy(info->driver, dev->dev->driver->name,
66 sizeof(info->driver));
68 strlcpy(info->model, dev->model, sizeof(info->model));
69 strlcpy(info->serial, dev->serial, sizeof(info->serial));
70 strlcpy(info->bus_info, dev->bus_info, sizeof(info->bus_info));
72 info->media_version = LINUX_VERSION_CODE;
73 info->driver_version = info->media_version;
74 info->hw_revision = dev->hw_revision;
79 static struct media_entity *find_entity(struct media_device *mdev, u32 id)
81 struct media_entity *entity;
82 int next = id & MEDIA_ENT_ID_FLAG_NEXT;
84 id &= ~MEDIA_ENT_ID_FLAG_NEXT;
86 media_device_for_each_entity(entity, mdev) {
87 if (((media_entity_id(entity) == id) && !next) ||
88 ((media_entity_id(entity) > id) && next)) {
96 static long media_device_enum_entities(struct media_device *mdev,
97 struct media_entity_desc *entd)
99 struct media_entity *ent;
101 ent = find_entity(mdev, entd->id);
105 memset(entd, 0, sizeof(*entd));
107 entd->id = media_entity_id(ent);
109 strlcpy(entd->name, ent->name, sizeof(entd->name));
110 entd->type = ent->function;
111 entd->revision = 0; /* Unused */
112 entd->flags = ent->flags;
113 entd->group_id = 0; /* Unused */
114 entd->pads = ent->num_pads;
115 entd->links = ent->num_links - ent->num_backlinks;
118 * Workaround for a bug at media-ctl <= v1.10 that makes it to
119 * do the wrong thing if the entity function doesn't belong to
120 * either MEDIA_ENT_F_OLD_BASE or MEDIA_ENT_F_OLD_SUBDEV_BASE
123 * Non-subdevices are expected to be at the MEDIA_ENT_F_OLD_BASE,
124 * or, otherwise, will be silently ignored by media-ctl when
125 * printing the graphviz diagram. So, map them into the devnode
128 if (ent->function < MEDIA_ENT_F_OLD_BASE ||
129 ent->function > MEDIA_ENT_F_TUNER) {
130 if (is_media_entity_v4l2_subdev(ent))
131 entd->type = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
132 else if (ent->function != MEDIA_ENT_F_IO_V4L)
133 entd->type = MEDIA_ENT_T_DEVNODE_UNKNOWN;
136 memcpy(&entd->raw, &ent->info, sizeof(ent->info));
141 static void media_device_kpad_to_upad(const struct media_pad *kpad,
142 struct media_pad_desc *upad)
144 upad->entity = media_entity_id(kpad->entity);
145 upad->index = kpad->index;
146 upad->flags = kpad->flags;
149 static long media_device_enum_links(struct media_device *mdev,
150 struct media_links_enum *links)
152 struct media_entity *entity;
154 entity = find_entity(mdev, links->entity);
161 for (p = 0; p < entity->num_pads; p++) {
162 struct media_pad_desc pad;
164 memset(&pad, 0, sizeof(pad));
165 media_device_kpad_to_upad(&entity->pads[p], &pad);
166 if (copy_to_user(&links->pads[p], &pad, sizeof(pad)))
172 struct media_link *link;
173 struct media_link_desc __user *ulink_desc = links->links;
175 list_for_each_entry(link, &entity->links, list) {
176 struct media_link_desc klink_desc;
178 /* Ignore backlinks. */
179 if (link->source->entity != entity)
181 memset(&klink_desc, 0, sizeof(klink_desc));
182 media_device_kpad_to_upad(link->source,
184 media_device_kpad_to_upad(link->sink,
186 klink_desc.flags = link->flags;
187 if (copy_to_user(ulink_desc, &klink_desc,
188 sizeof(*ulink_desc)))
193 memset(links->reserved, 0, sizeof(links->reserved));
198 static long media_device_setup_link(struct media_device *mdev,
199 struct media_link_desc *linkd)
201 struct media_link *link = NULL;
202 struct media_entity *source;
203 struct media_entity *sink;
205 /* Find the source and sink entities and link.
207 source = find_entity(mdev, linkd->source.entity);
208 sink = find_entity(mdev, linkd->sink.entity);
210 if (source == NULL || sink == NULL)
213 if (linkd->source.index >= source->num_pads ||
214 linkd->sink.index >= sink->num_pads)
217 link = media_entity_find_link(&source->pads[linkd->source.index],
218 &sink->pads[linkd->sink.index]);
222 memset(linkd->reserved, 0, sizeof(linkd->reserved));
224 /* Setup the link on both entities. */
225 return __media_entity_setup_link(link, linkd->flags);
228 static long media_device_get_topology(struct media_device *mdev,
229 struct media_v2_topology *topo)
231 struct media_entity *entity;
232 struct media_interface *intf;
233 struct media_pad *pad;
234 struct media_link *link;
235 struct media_v2_entity kentity, __user *uentity;
236 struct media_v2_interface kintf, __user *uintf;
237 struct media_v2_pad kpad, __user *upad;
238 struct media_v2_link klink, __user *ulink;
242 topo->topology_version = mdev->topology_version;
244 /* Get entities and number of entities */
246 uentity = media_get_uptr(topo->ptr_entities);
247 media_device_for_each_entity(entity, mdev) {
252 if (i > topo->num_entities) {
257 /* Copy fields to userspace struct if not error */
258 memset(&kentity, 0, sizeof(kentity));
259 kentity.id = entity->graph_obj.id;
260 kentity.function = entity->function;
261 strlcpy(kentity.name, entity->name,
262 sizeof(kentity.name));
264 if (copy_to_user(uentity, &kentity, sizeof(kentity)))
268 topo->num_entities = i;
271 /* Get interfaces and number of interfaces */
273 uintf = media_get_uptr(topo->ptr_interfaces);
274 media_device_for_each_intf(intf, mdev) {
279 if (i > topo->num_interfaces) {
284 memset(&kintf, 0, sizeof(kintf));
286 /* Copy intf fields to userspace struct */
287 kintf.id = intf->graph_obj.id;
288 kintf.intf_type = intf->type;
289 kintf.flags = intf->flags;
291 if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {
292 struct media_intf_devnode *devnode;
294 devnode = intf_to_devnode(intf);
296 kintf.devnode.major = devnode->major;
297 kintf.devnode.minor = devnode->minor;
300 if (copy_to_user(uintf, &kintf, sizeof(kintf)))
304 topo->num_interfaces = i;
307 /* Get pads and number of pads */
309 upad = media_get_uptr(topo->ptr_pads);
310 media_device_for_each_pad(pad, mdev) {
315 if (i > topo->num_pads) {
320 memset(&kpad, 0, sizeof(kpad));
322 /* Copy pad fields to userspace struct */
323 kpad.id = pad->graph_obj.id;
324 kpad.entity_id = pad->entity->graph_obj.id;
325 kpad.flags = pad->flags;
327 if (copy_to_user(upad, &kpad, sizeof(kpad)))
334 /* Get links and number of links */
336 ulink = media_get_uptr(topo->ptr_links);
337 media_device_for_each_link(link, mdev) {
338 if (link->is_backlink)
346 if (i > topo->num_links) {
351 memset(&klink, 0, sizeof(klink));
353 /* Copy link fields to userspace struct */
354 klink.id = link->graph_obj.id;
355 klink.source_id = link->gobj0->id;
356 klink.sink_id = link->gobj1->id;
357 klink.flags = link->flags;
359 if (copy_to_user(ulink, &klink, sizeof(klink)))
369 static long copy_arg_from_user(void *karg, void __user *uarg, unsigned int cmd)
371 /* All media IOCTLs are _IOWR() */
372 if (copy_from_user(karg, uarg, _IOC_SIZE(cmd)))
378 static long copy_arg_to_user(void __user *uarg, void *karg, unsigned int cmd)
380 /* All media IOCTLs are _IOWR() */
381 if (copy_to_user(uarg, karg, _IOC_SIZE(cmd)))
387 /* Do acquire the graph mutex */
388 #define MEDIA_IOC_FL_GRAPH_MUTEX BIT(0)
390 #define MEDIA_IOC_ARG(__cmd, func, fl, from_user, to_user) \
391 [_IOC_NR(MEDIA_IOC_##__cmd)] = { \
392 .cmd = MEDIA_IOC_##__cmd, \
393 .fn = (long (*)(struct media_device *, void *))func, \
395 .arg_from_user = from_user, \
396 .arg_to_user = to_user, \
399 #define MEDIA_IOC(__cmd, func, fl) \
400 MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user)
402 /* the table is indexed by _IOC_NR(cmd) */
403 struct media_ioctl_info {
405 unsigned short flags;
406 long (*fn)(struct media_device *dev, void *arg);
407 long (*arg_from_user)(void *karg, void __user *uarg, unsigned int cmd);
408 long (*arg_to_user)(void __user *uarg, void *karg, unsigned int cmd);
411 static const struct media_ioctl_info ioctl_info[] = {
412 MEDIA_IOC(DEVICE_INFO, media_device_get_info, MEDIA_IOC_FL_GRAPH_MUTEX),
413 MEDIA_IOC(ENUM_ENTITIES, media_device_enum_entities, MEDIA_IOC_FL_GRAPH_MUTEX),
414 MEDIA_IOC(ENUM_LINKS, media_device_enum_links, MEDIA_IOC_FL_GRAPH_MUTEX),
415 MEDIA_IOC(SETUP_LINK, media_device_setup_link, MEDIA_IOC_FL_GRAPH_MUTEX),
416 MEDIA_IOC(G_TOPOLOGY, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX),
419 static long media_device_ioctl(struct file *filp, unsigned int cmd,
422 struct media_devnode *devnode = media_devnode_data(filp);
423 struct media_device *dev = devnode->media_dev;
424 const struct media_ioctl_info *info;
425 void __user *arg = (void __user *)__arg;
426 char __karg[256], *karg = __karg;
429 if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info)
430 || ioctl_info[_IOC_NR(cmd)].cmd != cmd)
433 info = &ioctl_info[_IOC_NR(cmd)];
435 if (_IOC_SIZE(info->cmd) > sizeof(__karg)) {
436 karg = kmalloc(_IOC_SIZE(info->cmd), GFP_KERNEL);
441 if (info->arg_from_user) {
442 ret = info->arg_from_user(karg, arg, cmd);
447 if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
448 mutex_lock(&dev->graph_mutex);
450 ret = info->fn(dev, karg);
452 if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
453 mutex_unlock(&dev->graph_mutex);
455 if (!ret && info->arg_to_user)
456 ret = info->arg_to_user(arg, karg, cmd);
467 struct media_links_enum32 {
469 compat_uptr_t pads; /* struct media_pad_desc * */
470 compat_uptr_t links; /* struct media_link_desc * */
474 static long media_device_enum_links32(struct media_device *mdev,
475 struct media_links_enum32 __user *ulinks)
477 struct media_links_enum links;
478 compat_uptr_t pads_ptr, links_ptr;
480 memset(&links, 0, sizeof(links));
482 if (get_user(links.entity, &ulinks->entity)
483 || get_user(pads_ptr, &ulinks->pads)
484 || get_user(links_ptr, &ulinks->links))
487 links.pads = compat_ptr(pads_ptr);
488 links.links = compat_ptr(links_ptr);
490 return media_device_enum_links(mdev, &links);
493 #define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct media_links_enum32)
495 static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
498 struct media_devnode *devnode = media_devnode_data(filp);
499 struct media_device *dev = devnode->media_dev;
503 case MEDIA_IOC_ENUM_LINKS32:
504 mutex_lock(&dev->graph_mutex);
505 ret = media_device_enum_links32(dev,
506 (struct media_links_enum32 __user *)arg);
507 mutex_unlock(&dev->graph_mutex);
511 return media_device_ioctl(filp, cmd, arg);
516 #endif /* CONFIG_COMPAT */
518 static const struct media_file_operations media_device_fops = {
519 .owner = THIS_MODULE,
520 .open = media_device_open,
521 .ioctl = media_device_ioctl,
523 .compat_ioctl = media_device_compat_ioctl,
524 #endif /* CONFIG_COMPAT */
525 .release = media_device_close,
528 /* -----------------------------------------------------------------------------
532 static ssize_t show_model(struct device *cd,
533 struct device_attribute *attr, char *buf)
535 struct media_devnode *devnode = to_media_devnode(cd);
536 struct media_device *mdev = devnode->media_dev;
538 return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
541 static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
543 /* -----------------------------------------------------------------------------
544 * Registration/unregistration
547 static void media_device_release(struct media_devnode *devnode)
549 dev_dbg(devnode->parent, "Media device released\n");
553 * media_device_register_entity - Register an entity with a media device
554 * @mdev: The media device
555 * @entity: The entity
557 int __must_check media_device_register_entity(struct media_device *mdev,
558 struct media_entity *entity)
560 struct media_entity_notify *notify, *next;
564 if (entity->function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN ||
565 entity->function == MEDIA_ENT_F_UNKNOWN)
567 "Entity type for entity %s was not initialized!\n",
570 /* Warn if we apparently re-register an entity */
571 WARN_ON(entity->graph_obj.mdev != NULL);
572 entity->graph_obj.mdev = mdev;
573 INIT_LIST_HEAD(&entity->links);
574 entity->num_links = 0;
575 entity->num_backlinks = 0;
577 if (!ida_pre_get(&mdev->entity_internal_idx, GFP_KERNEL))
580 mutex_lock(&mdev->graph_mutex);
582 ret = ida_get_new_above(&mdev->entity_internal_idx, 1,
583 &entity->internal_idx);
585 mutex_unlock(&mdev->graph_mutex);
589 mdev->entity_internal_idx_max =
590 max(mdev->entity_internal_idx_max, entity->internal_idx);
592 /* Initialize media_gobj embedded at the entity */
593 media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
595 /* Initialize objects at the pads */
596 for (i = 0; i < entity->num_pads; i++)
597 media_gobj_create(mdev, MEDIA_GRAPH_PAD,
598 &entity->pads[i].graph_obj);
600 /* invoke entity_notify callbacks */
601 list_for_each_entry_safe(notify, next, &mdev->entity_notify, list)
602 notify->notify(entity, notify->notify_data);
604 if (mdev->entity_internal_idx_max
605 >= mdev->pm_count_walk.ent_enum.idx_max) {
606 struct media_graph new = { .top = 0 };
609 * Initialise the new graph walk before cleaning up
610 * the old one in order not to spoil the graph walk
611 * object of the media device if graph walk init fails.
613 ret = media_graph_walk_init(&new, mdev);
615 mutex_unlock(&mdev->graph_mutex);
618 media_graph_walk_cleanup(&mdev->pm_count_walk);
619 mdev->pm_count_walk = new;
621 mutex_unlock(&mdev->graph_mutex);
625 EXPORT_SYMBOL_GPL(media_device_register_entity);
627 static void __media_device_unregister_entity(struct media_entity *entity)
629 struct media_device *mdev = entity->graph_obj.mdev;
630 struct media_link *link, *tmp;
631 struct media_interface *intf;
634 ida_simple_remove(&mdev->entity_internal_idx, entity->internal_idx);
636 /* Remove all interface links pointing to this entity */
637 list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) {
638 list_for_each_entry_safe(link, tmp, &intf->links, list) {
639 if (link->entity == entity)
640 __media_remove_intf_link(link);
644 /* Remove all data links that belong to this entity */
645 __media_entity_remove_links(entity);
647 /* Remove all pads that belong to this entity */
648 for (i = 0; i < entity->num_pads; i++)
649 media_gobj_destroy(&entity->pads[i].graph_obj);
651 /* Remove the entity */
652 media_gobj_destroy(&entity->graph_obj);
654 /* invoke entity_notify callbacks to handle entity removal?? */
656 entity->graph_obj.mdev = NULL;
659 void media_device_unregister_entity(struct media_entity *entity)
661 struct media_device *mdev = entity->graph_obj.mdev;
666 mutex_lock(&mdev->graph_mutex);
667 __media_device_unregister_entity(entity);
668 mutex_unlock(&mdev->graph_mutex);
670 EXPORT_SYMBOL_GPL(media_device_unregister_entity);
673 * media_device_init() - initialize a media device
674 * @mdev: The media device
676 * The caller is responsible for initializing the media device before
677 * registration. The following fields must be set:
679 * - dev must point to the parent device
680 * - model must be filled with the device model name
682 void media_device_init(struct media_device *mdev)
684 INIT_LIST_HEAD(&mdev->entities);
685 INIT_LIST_HEAD(&mdev->interfaces);
686 INIT_LIST_HEAD(&mdev->pads);
687 INIT_LIST_HEAD(&mdev->links);
688 INIT_LIST_HEAD(&mdev->entity_notify);
689 mutex_init(&mdev->graph_mutex);
690 ida_init(&mdev->entity_internal_idx);
692 dev_dbg(mdev->dev, "Media device initialized\n");
694 EXPORT_SYMBOL_GPL(media_device_init);
696 void media_device_cleanup(struct media_device *mdev)
698 ida_destroy(&mdev->entity_internal_idx);
699 mdev->entity_internal_idx_max = 0;
700 media_graph_walk_cleanup(&mdev->pm_count_walk);
701 mutex_destroy(&mdev->graph_mutex);
703 EXPORT_SYMBOL_GPL(media_device_cleanup);
705 int __must_check __media_device_register(struct media_device *mdev,
706 struct module *owner)
708 struct media_devnode *devnode;
711 devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
715 /* Register the device node. */
716 mdev->devnode = devnode;
717 devnode->fops = &media_device_fops;
718 devnode->parent = mdev->dev;
719 devnode->release = media_device_release;
721 /* Set version 0 to indicate user-space that the graph is static */
722 mdev->topology_version = 0;
724 ret = media_devnode_register(mdev, devnode, owner);
726 /* devnode free is handled in media_devnode_*() */
727 mdev->devnode = NULL;
731 ret = device_create_file(&devnode->dev, &dev_attr_model);
733 /* devnode free is handled in media_devnode_*() */
734 mdev->devnode = NULL;
735 media_devnode_unregister_prepare(devnode);
736 media_devnode_unregister(devnode);
740 dev_dbg(mdev->dev, "Media device registered\n");
744 EXPORT_SYMBOL_GPL(__media_device_register);
746 int __must_check media_device_register_entity_notify(struct media_device *mdev,
747 struct media_entity_notify *nptr)
749 mutex_lock(&mdev->graph_mutex);
750 list_add_tail(&nptr->list, &mdev->entity_notify);
751 mutex_unlock(&mdev->graph_mutex);
754 EXPORT_SYMBOL_GPL(media_device_register_entity_notify);
757 * Note: Should be called with mdev->lock held.
759 static void __media_device_unregister_entity_notify(struct media_device *mdev,
760 struct media_entity_notify *nptr)
762 list_del(&nptr->list);
765 void media_device_unregister_entity_notify(struct media_device *mdev,
766 struct media_entity_notify *nptr)
768 mutex_lock(&mdev->graph_mutex);
769 __media_device_unregister_entity_notify(mdev, nptr);
770 mutex_unlock(&mdev->graph_mutex);
772 EXPORT_SYMBOL_GPL(media_device_unregister_entity_notify);
774 void media_device_unregister(struct media_device *mdev)
776 struct media_entity *entity;
777 struct media_entity *next;
778 struct media_interface *intf, *tmp_intf;
779 struct media_entity_notify *notify, *nextp;
784 mutex_lock(&mdev->graph_mutex);
786 /* Check if mdev was ever registered at all */
787 if (!media_devnode_is_registered(mdev->devnode)) {
788 mutex_unlock(&mdev->graph_mutex);
792 /* Clear the devnode register bit to avoid races with media dev open */
793 media_devnode_unregister_prepare(mdev->devnode);
795 /* Remove all entities from the media device */
796 list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)
797 __media_device_unregister_entity(entity);
799 /* Remove all entity_notify callbacks from the media device */
800 list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list)
801 __media_device_unregister_entity_notify(mdev, notify);
803 /* Remove all interfaces from the media device */
804 list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,
807 * Unlink the interface, but don't free it here; the
808 * module which created it is responsible for freeing
811 __media_remove_intf_links(intf);
812 media_gobj_destroy(&intf->graph_obj);
815 mutex_unlock(&mdev->graph_mutex);
817 dev_dbg(mdev->dev, "Media device unregistered\n");
819 device_remove_file(&mdev->devnode->dev, &dev_attr_model);
820 media_devnode_unregister(mdev->devnode);
821 /* devnode free is handled in media_devnode_*() */
822 mdev->devnode = NULL;
824 EXPORT_SYMBOL_GPL(media_device_unregister);
826 #if IS_ENABLED(CONFIG_PCI)
827 void media_device_pci_init(struct media_device *mdev,
828 struct pci_dev *pci_dev,
831 mdev->dev = &pci_dev->dev;
834 strlcpy(mdev->model, name, sizeof(mdev->model));
836 strlcpy(mdev->model, pci_name(pci_dev), sizeof(mdev->model));
838 sprintf(mdev->bus_info, "PCI:%s", pci_name(pci_dev));
840 mdev->hw_revision = (pci_dev->subsystem_vendor << 16)
841 | pci_dev->subsystem_device;
843 media_device_init(mdev);
845 EXPORT_SYMBOL_GPL(media_device_pci_init);
848 #if IS_ENABLED(CONFIG_USB)
849 void __media_device_usb_init(struct media_device *mdev,
850 struct usb_device *udev,
851 const char *board_name,
852 const char *driver_name)
854 mdev->dev = &udev->dev;
857 strlcpy(mdev->driver_name, driver_name,
858 sizeof(mdev->driver_name));
861 strlcpy(mdev->model, board_name, sizeof(mdev->model));
862 else if (udev->product)
863 strlcpy(mdev->model, udev->product, sizeof(mdev->model));
865 strlcpy(mdev->model, "unknown model", sizeof(mdev->model));
867 strlcpy(mdev->serial, udev->serial, sizeof(mdev->serial));
868 usb_make_path(udev, mdev->bus_info, sizeof(mdev->bus_info));
869 mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
871 media_device_init(mdev);
873 EXPORT_SYMBOL_GPL(__media_device_usb_init);
877 #endif /* CONFIG_MEDIA_CONTROLLER */