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 #include <linux/compat.h>
20 #include <linux/export.h>
21 #include <linux/idr.h>
22 #include <linux/ioctl.h>
23 #include <linux/media.h>
24 #include <linux/slab.h>
25 #include <linux/types.h>
26 #include <linux/pci.h>
27 #include <linux/usb.h>
28 #include <linux/version.h>
30 #include <media/media-device.h>
31 #include <media/media-devnode.h>
32 #include <media/media-entity.h>
34 #ifdef CONFIG_MEDIA_CONTROLLER
37 * Legacy defines from linux/media.h. This is the only place we need this
38 * so we just define it here. The media.h header doesn't expose it to the
39 * kernel to prevent it from being used by drivers, but here (and only here!)
40 * we need it to handle the legacy behavior.
42 #define MEDIA_ENT_SUBTYPE_MASK 0x0000ffff
43 #define MEDIA_ENT_T_DEVNODE_UNKNOWN (MEDIA_ENT_F_OLD_BASE | \
44 MEDIA_ENT_SUBTYPE_MASK)
46 /* -----------------------------------------------------------------------------
50 static inline void __user *media_get_uptr(__u64 arg)
52 return (void __user *)(uintptr_t)arg;
55 static int media_device_open(struct file *filp)
60 static int media_device_close(struct file *filp)
65 static long media_device_get_info(struct media_device *dev, void *arg)
67 struct media_device_info *info = arg;
69 memset(info, 0, sizeof(*info));
71 if (dev->driver_name[0])
72 strlcpy(info->driver, dev->driver_name, sizeof(info->driver));
74 strlcpy(info->driver, dev->dev->driver->name,
75 sizeof(info->driver));
77 strlcpy(info->model, dev->model, sizeof(info->model));
78 strlcpy(info->serial, dev->serial, sizeof(info->serial));
79 strlcpy(info->bus_info, dev->bus_info, sizeof(info->bus_info));
81 info->media_version = LINUX_VERSION_CODE;
82 info->driver_version = info->media_version;
83 info->hw_revision = dev->hw_revision;
88 static struct media_entity *find_entity(struct media_device *mdev, u32 id)
90 struct media_entity *entity;
91 int next = id & MEDIA_ENT_ID_FLAG_NEXT;
93 id &= ~MEDIA_ENT_ID_FLAG_NEXT;
95 media_device_for_each_entity(entity, mdev) {
96 if (((media_entity_id(entity) == id) && !next) ||
97 ((media_entity_id(entity) > id) && next)) {
105 static long media_device_enum_entities(struct media_device *mdev, void *arg)
107 struct media_entity_desc *entd = arg;
108 struct media_entity *ent;
110 ent = find_entity(mdev, entd->id);
114 memset(entd, 0, sizeof(*entd));
116 entd->id = media_entity_id(ent);
118 strlcpy(entd->name, ent->name, sizeof(entd->name));
119 entd->type = ent->function;
120 entd->revision = 0; /* Unused */
121 entd->flags = ent->flags;
122 entd->group_id = 0; /* Unused */
123 entd->pads = ent->num_pads;
124 entd->links = ent->num_links - ent->num_backlinks;
127 * Workaround for a bug at media-ctl <= v1.10 that makes it to
128 * do the wrong thing if the entity function doesn't belong to
129 * either MEDIA_ENT_F_OLD_BASE or MEDIA_ENT_F_OLD_SUBDEV_BASE
132 * Non-subdevices are expected to be at the MEDIA_ENT_F_OLD_BASE,
133 * or, otherwise, will be silently ignored by media-ctl when
134 * printing the graphviz diagram. So, map them into the devnode
137 if (ent->function < MEDIA_ENT_F_OLD_BASE ||
138 ent->function > MEDIA_ENT_F_TUNER) {
139 if (is_media_entity_v4l2_subdev(ent))
140 entd->type = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
141 else if (ent->function != MEDIA_ENT_F_IO_V4L)
142 entd->type = MEDIA_ENT_T_DEVNODE_UNKNOWN;
145 memcpy(&entd->raw, &ent->info, sizeof(ent->info));
150 static void media_device_kpad_to_upad(const struct media_pad *kpad,
151 struct media_pad_desc *upad)
153 upad->entity = media_entity_id(kpad->entity);
154 upad->index = kpad->index;
155 upad->flags = kpad->flags;
158 static long media_device_enum_links(struct media_device *mdev, void *arg)
160 struct media_links_enum *links = arg;
161 struct media_entity *entity;
163 entity = find_entity(mdev, links->entity);
170 for (p = 0; p < entity->num_pads; p++) {
171 struct media_pad_desc pad;
173 memset(&pad, 0, sizeof(pad));
174 media_device_kpad_to_upad(&entity->pads[p], &pad);
175 if (copy_to_user(&links->pads[p], &pad, sizeof(pad)))
181 struct media_link *link;
182 struct media_link_desc __user *ulink_desc = links->links;
184 list_for_each_entry(link, &entity->links, list) {
185 struct media_link_desc klink_desc;
187 /* Ignore backlinks. */
188 if (link->source->entity != entity)
190 memset(&klink_desc, 0, sizeof(klink_desc));
191 media_device_kpad_to_upad(link->source,
193 media_device_kpad_to_upad(link->sink,
195 klink_desc.flags = link->flags;
196 if (copy_to_user(ulink_desc, &klink_desc,
197 sizeof(*ulink_desc)))
202 memset(links->reserved, 0, sizeof(links->reserved));
207 static long media_device_setup_link(struct media_device *mdev, void *arg)
209 struct media_link_desc *linkd = arg;
210 struct media_link *link = NULL;
211 struct media_entity *source;
212 struct media_entity *sink;
214 /* Find the source and sink entities and link.
216 source = find_entity(mdev, linkd->source.entity);
217 sink = find_entity(mdev, linkd->sink.entity);
219 if (source == NULL || sink == NULL)
222 if (linkd->source.index >= source->num_pads ||
223 linkd->sink.index >= sink->num_pads)
226 link = media_entity_find_link(&source->pads[linkd->source.index],
227 &sink->pads[linkd->sink.index]);
231 memset(linkd->reserved, 0, sizeof(linkd->reserved));
233 /* Setup the link on both entities. */
234 return __media_entity_setup_link(link, linkd->flags);
237 static long media_device_get_topology(struct media_device *mdev, void *arg)
239 struct media_v2_topology *topo = arg;
240 struct media_entity *entity;
241 struct media_interface *intf;
242 struct media_pad *pad;
243 struct media_link *link;
244 struct media_v2_entity kentity, __user *uentity;
245 struct media_v2_interface kintf, __user *uintf;
246 struct media_v2_pad kpad, __user *upad;
247 struct media_v2_link klink, __user *ulink;
251 topo->topology_version = mdev->topology_version;
253 /* Get entities and number of entities */
255 uentity = media_get_uptr(topo->ptr_entities);
256 media_device_for_each_entity(entity, mdev) {
261 if (i > topo->num_entities) {
266 /* Copy fields to userspace struct if not error */
267 memset(&kentity, 0, sizeof(kentity));
268 kentity.id = entity->graph_obj.id;
269 kentity.function = entity->function;
270 kentity.flags = entity->flags;
271 strlcpy(kentity.name, entity->name,
272 sizeof(kentity.name));
274 if (copy_to_user(uentity, &kentity, sizeof(kentity)))
278 topo->num_entities = i;
281 /* Get interfaces and number of interfaces */
283 uintf = media_get_uptr(topo->ptr_interfaces);
284 media_device_for_each_intf(intf, mdev) {
289 if (i > topo->num_interfaces) {
294 memset(&kintf, 0, sizeof(kintf));
296 /* Copy intf fields to userspace struct */
297 kintf.id = intf->graph_obj.id;
298 kintf.intf_type = intf->type;
299 kintf.flags = intf->flags;
301 if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {
302 struct media_intf_devnode *devnode;
304 devnode = intf_to_devnode(intf);
306 kintf.devnode.major = devnode->major;
307 kintf.devnode.minor = devnode->minor;
310 if (copy_to_user(uintf, &kintf, sizeof(kintf)))
314 topo->num_interfaces = i;
317 /* Get pads and number of pads */
319 upad = media_get_uptr(topo->ptr_pads);
320 media_device_for_each_pad(pad, mdev) {
325 if (i > topo->num_pads) {
330 memset(&kpad, 0, sizeof(kpad));
332 /* Copy pad fields to userspace struct */
333 kpad.id = pad->graph_obj.id;
334 kpad.entity_id = pad->entity->graph_obj.id;
335 kpad.flags = pad->flags;
336 kpad.index = pad->index;
338 if (copy_to_user(upad, &kpad, sizeof(kpad)))
345 /* Get links and number of links */
347 ulink = media_get_uptr(topo->ptr_links);
348 media_device_for_each_link(link, mdev) {
349 if (link->is_backlink)
357 if (i > topo->num_links) {
362 memset(&klink, 0, sizeof(klink));
364 /* Copy link fields to userspace struct */
365 klink.id = link->graph_obj.id;
366 klink.source_id = link->gobj0->id;
367 klink.sink_id = link->gobj1->id;
368 klink.flags = link->flags;
370 if (copy_to_user(ulink, &klink, sizeof(klink)))
380 static long copy_arg_from_user(void *karg, void __user *uarg, unsigned int cmd)
382 /* All media IOCTLs are _IOWR() */
383 if (copy_from_user(karg, uarg, _IOC_SIZE(cmd)))
389 static long copy_arg_to_user(void __user *uarg, void *karg, unsigned int cmd)
391 /* All media IOCTLs are _IOWR() */
392 if (copy_to_user(uarg, karg, _IOC_SIZE(cmd)))
398 /* Do acquire the graph mutex */
399 #define MEDIA_IOC_FL_GRAPH_MUTEX BIT(0)
401 #define MEDIA_IOC_ARG(__cmd, func, fl, from_user, to_user) \
402 [_IOC_NR(MEDIA_IOC_##__cmd)] = { \
403 .cmd = MEDIA_IOC_##__cmd, \
404 .fn = (long (*)(struct media_device *, void *))func, \
406 .arg_from_user = from_user, \
407 .arg_to_user = to_user, \
410 #define MEDIA_IOC(__cmd, func, fl) \
411 MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user)
413 /* the table is indexed by _IOC_NR(cmd) */
414 struct media_ioctl_info {
416 unsigned short flags;
417 long (*fn)(struct media_device *dev, void *arg);
418 long (*arg_from_user)(void *karg, void __user *uarg, unsigned int cmd);
419 long (*arg_to_user)(void __user *uarg, void *karg, unsigned int cmd);
422 static const struct media_ioctl_info ioctl_info[] = {
423 MEDIA_IOC(DEVICE_INFO, media_device_get_info, MEDIA_IOC_FL_GRAPH_MUTEX),
424 MEDIA_IOC(ENUM_ENTITIES, media_device_enum_entities, MEDIA_IOC_FL_GRAPH_MUTEX),
425 MEDIA_IOC(ENUM_LINKS, media_device_enum_links, MEDIA_IOC_FL_GRAPH_MUTEX),
426 MEDIA_IOC(SETUP_LINK, media_device_setup_link, MEDIA_IOC_FL_GRAPH_MUTEX),
427 MEDIA_IOC(G_TOPOLOGY, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX),
430 static long media_device_ioctl(struct file *filp, unsigned int cmd,
433 struct media_devnode *devnode = media_devnode_data(filp);
434 struct media_device *dev = devnode->media_dev;
435 const struct media_ioctl_info *info;
436 void __user *arg = (void __user *)__arg;
437 char __karg[256], *karg = __karg;
440 if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info)
441 || ioctl_info[_IOC_NR(cmd)].cmd != cmd)
444 info = &ioctl_info[_IOC_NR(cmd)];
446 if (_IOC_SIZE(info->cmd) > sizeof(__karg)) {
447 karg = kmalloc(_IOC_SIZE(info->cmd), GFP_KERNEL);
452 if (info->arg_from_user) {
453 ret = info->arg_from_user(karg, arg, cmd);
458 if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
459 mutex_lock(&dev->graph_mutex);
461 ret = info->fn(dev, karg);
463 if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
464 mutex_unlock(&dev->graph_mutex);
466 if (!ret && info->arg_to_user)
467 ret = info->arg_to_user(arg, karg, cmd);
478 struct media_links_enum32 {
480 compat_uptr_t pads; /* struct media_pad_desc * */
481 compat_uptr_t links; /* struct media_link_desc * */
485 static long media_device_enum_links32(struct media_device *mdev,
486 struct media_links_enum32 __user *ulinks)
488 struct media_links_enum links;
489 compat_uptr_t pads_ptr, links_ptr;
491 memset(&links, 0, sizeof(links));
493 if (get_user(links.entity, &ulinks->entity)
494 || get_user(pads_ptr, &ulinks->pads)
495 || get_user(links_ptr, &ulinks->links))
498 links.pads = compat_ptr(pads_ptr);
499 links.links = compat_ptr(links_ptr);
501 return media_device_enum_links(mdev, &links);
504 #define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct media_links_enum32)
506 static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
509 struct media_devnode *devnode = media_devnode_data(filp);
510 struct media_device *dev = devnode->media_dev;
514 case MEDIA_IOC_ENUM_LINKS32:
515 mutex_lock(&dev->graph_mutex);
516 ret = media_device_enum_links32(dev,
517 (struct media_links_enum32 __user *)arg);
518 mutex_unlock(&dev->graph_mutex);
522 return media_device_ioctl(filp, cmd, arg);
527 #endif /* CONFIG_COMPAT */
529 static const struct media_file_operations media_device_fops = {
530 .owner = THIS_MODULE,
531 .open = media_device_open,
532 .ioctl = media_device_ioctl,
534 .compat_ioctl = media_device_compat_ioctl,
535 #endif /* CONFIG_COMPAT */
536 .release = media_device_close,
539 /* -----------------------------------------------------------------------------
543 static ssize_t show_model(struct device *cd,
544 struct device_attribute *attr, char *buf)
546 struct media_devnode *devnode = to_media_devnode(cd);
547 struct media_device *mdev = devnode->media_dev;
549 return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
552 static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
554 /* -----------------------------------------------------------------------------
555 * Registration/unregistration
558 static void media_device_release(struct media_devnode *devnode)
560 dev_dbg(devnode->parent, "Media device released\n");
564 * media_device_register_entity - Register an entity with a media device
565 * @mdev: The media device
566 * @entity: The entity
568 int __must_check media_device_register_entity(struct media_device *mdev,
569 struct media_entity *entity)
571 struct media_entity_notify *notify, *next;
575 if (entity->function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN ||
576 entity->function == MEDIA_ENT_F_UNKNOWN)
578 "Entity type for entity %s was not initialized!\n",
581 /* Warn if we apparently re-register an entity */
582 WARN_ON(entity->graph_obj.mdev != NULL);
583 entity->graph_obj.mdev = mdev;
584 INIT_LIST_HEAD(&entity->links);
585 entity->num_links = 0;
586 entity->num_backlinks = 0;
588 if (!ida_pre_get(&mdev->entity_internal_idx, GFP_KERNEL))
591 mutex_lock(&mdev->graph_mutex);
593 ret = ida_get_new_above(&mdev->entity_internal_idx, 1,
594 &entity->internal_idx);
596 mutex_unlock(&mdev->graph_mutex);
600 mdev->entity_internal_idx_max =
601 max(mdev->entity_internal_idx_max, entity->internal_idx);
603 /* Initialize media_gobj embedded at the entity */
604 media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
606 /* Initialize objects at the pads */
607 for (i = 0; i < entity->num_pads; i++)
608 media_gobj_create(mdev, MEDIA_GRAPH_PAD,
609 &entity->pads[i].graph_obj);
611 /* invoke entity_notify callbacks */
612 list_for_each_entry_safe(notify, next, &mdev->entity_notify, list)
613 notify->notify(entity, notify->notify_data);
615 if (mdev->entity_internal_idx_max
616 >= mdev->pm_count_walk.ent_enum.idx_max) {
617 struct media_graph new = { .top = 0 };
620 * Initialise the new graph walk before cleaning up
621 * the old one in order not to spoil the graph walk
622 * object of the media device if graph walk init fails.
624 ret = media_graph_walk_init(&new, mdev);
626 mutex_unlock(&mdev->graph_mutex);
629 media_graph_walk_cleanup(&mdev->pm_count_walk);
630 mdev->pm_count_walk = new;
632 mutex_unlock(&mdev->graph_mutex);
636 EXPORT_SYMBOL_GPL(media_device_register_entity);
638 static void __media_device_unregister_entity(struct media_entity *entity)
640 struct media_device *mdev = entity->graph_obj.mdev;
641 struct media_link *link, *tmp;
642 struct media_interface *intf;
645 ida_simple_remove(&mdev->entity_internal_idx, entity->internal_idx);
647 /* Remove all interface links pointing to this entity */
648 list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) {
649 list_for_each_entry_safe(link, tmp, &intf->links, list) {
650 if (link->entity == entity)
651 __media_remove_intf_link(link);
655 /* Remove all data links that belong to this entity */
656 __media_entity_remove_links(entity);
658 /* Remove all pads that belong to this entity */
659 for (i = 0; i < entity->num_pads; i++)
660 media_gobj_destroy(&entity->pads[i].graph_obj);
662 /* Remove the entity */
663 media_gobj_destroy(&entity->graph_obj);
665 /* invoke entity_notify callbacks to handle entity removal?? */
667 entity->graph_obj.mdev = NULL;
670 void media_device_unregister_entity(struct media_entity *entity)
672 struct media_device *mdev = entity->graph_obj.mdev;
677 mutex_lock(&mdev->graph_mutex);
678 __media_device_unregister_entity(entity);
679 mutex_unlock(&mdev->graph_mutex);
681 EXPORT_SYMBOL_GPL(media_device_unregister_entity);
684 * media_device_init() - initialize a media device
685 * @mdev: The media device
687 * The caller is responsible for initializing the media device before
688 * registration. The following fields must be set:
690 * - dev must point to the parent device
691 * - model must be filled with the device model name
693 void media_device_init(struct media_device *mdev)
695 INIT_LIST_HEAD(&mdev->entities);
696 INIT_LIST_HEAD(&mdev->interfaces);
697 INIT_LIST_HEAD(&mdev->pads);
698 INIT_LIST_HEAD(&mdev->links);
699 INIT_LIST_HEAD(&mdev->entity_notify);
700 mutex_init(&mdev->graph_mutex);
701 ida_init(&mdev->entity_internal_idx);
703 dev_dbg(mdev->dev, "Media device initialized\n");
705 EXPORT_SYMBOL_GPL(media_device_init);
707 void media_device_cleanup(struct media_device *mdev)
709 ida_destroy(&mdev->entity_internal_idx);
710 mdev->entity_internal_idx_max = 0;
711 media_graph_walk_cleanup(&mdev->pm_count_walk);
712 mutex_destroy(&mdev->graph_mutex);
714 EXPORT_SYMBOL_GPL(media_device_cleanup);
716 int __must_check __media_device_register(struct media_device *mdev,
717 struct module *owner)
719 struct media_devnode *devnode;
722 devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
726 /* Register the device node. */
727 mdev->devnode = devnode;
728 devnode->fops = &media_device_fops;
729 devnode->parent = mdev->dev;
730 devnode->release = media_device_release;
732 /* Set version 0 to indicate user-space that the graph is static */
733 mdev->topology_version = 0;
735 ret = media_devnode_register(mdev, devnode, owner);
737 /* devnode free is handled in media_devnode_*() */
738 mdev->devnode = NULL;
742 ret = device_create_file(&devnode->dev, &dev_attr_model);
744 /* devnode free is handled in media_devnode_*() */
745 mdev->devnode = NULL;
746 media_devnode_unregister_prepare(devnode);
747 media_devnode_unregister(devnode);
751 dev_dbg(mdev->dev, "Media device registered\n");
755 EXPORT_SYMBOL_GPL(__media_device_register);
757 int __must_check media_device_register_entity_notify(struct media_device *mdev,
758 struct media_entity_notify *nptr)
760 mutex_lock(&mdev->graph_mutex);
761 list_add_tail(&nptr->list, &mdev->entity_notify);
762 mutex_unlock(&mdev->graph_mutex);
765 EXPORT_SYMBOL_GPL(media_device_register_entity_notify);
768 * Note: Should be called with mdev->lock held.
770 static void __media_device_unregister_entity_notify(struct media_device *mdev,
771 struct media_entity_notify *nptr)
773 list_del(&nptr->list);
776 void media_device_unregister_entity_notify(struct media_device *mdev,
777 struct media_entity_notify *nptr)
779 mutex_lock(&mdev->graph_mutex);
780 __media_device_unregister_entity_notify(mdev, nptr);
781 mutex_unlock(&mdev->graph_mutex);
783 EXPORT_SYMBOL_GPL(media_device_unregister_entity_notify);
785 void media_device_unregister(struct media_device *mdev)
787 struct media_entity *entity;
788 struct media_entity *next;
789 struct media_interface *intf, *tmp_intf;
790 struct media_entity_notify *notify, *nextp;
795 mutex_lock(&mdev->graph_mutex);
797 /* Check if mdev was ever registered at all */
798 if (!media_devnode_is_registered(mdev->devnode)) {
799 mutex_unlock(&mdev->graph_mutex);
803 /* Clear the devnode register bit to avoid races with media dev open */
804 media_devnode_unregister_prepare(mdev->devnode);
806 /* Remove all entities from the media device */
807 list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)
808 __media_device_unregister_entity(entity);
810 /* Remove all entity_notify callbacks from the media device */
811 list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list)
812 __media_device_unregister_entity_notify(mdev, notify);
814 /* Remove all interfaces from the media device */
815 list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,
818 * Unlink the interface, but don't free it here; the
819 * module which created it is responsible for freeing
822 __media_remove_intf_links(intf);
823 media_gobj_destroy(&intf->graph_obj);
826 mutex_unlock(&mdev->graph_mutex);
828 dev_dbg(mdev->dev, "Media device unregistered\n");
830 device_remove_file(&mdev->devnode->dev, &dev_attr_model);
831 media_devnode_unregister(mdev->devnode);
832 /* devnode free is handled in media_devnode_*() */
833 mdev->devnode = NULL;
835 EXPORT_SYMBOL_GPL(media_device_unregister);
837 #if IS_ENABLED(CONFIG_PCI)
838 void media_device_pci_init(struct media_device *mdev,
839 struct pci_dev *pci_dev,
842 mdev->dev = &pci_dev->dev;
845 strlcpy(mdev->model, name, sizeof(mdev->model));
847 strlcpy(mdev->model, pci_name(pci_dev), sizeof(mdev->model));
849 sprintf(mdev->bus_info, "PCI:%s", pci_name(pci_dev));
851 mdev->hw_revision = (pci_dev->subsystem_vendor << 16)
852 | pci_dev->subsystem_device;
854 media_device_init(mdev);
856 EXPORT_SYMBOL_GPL(media_device_pci_init);
859 #if IS_ENABLED(CONFIG_USB)
860 void __media_device_usb_init(struct media_device *mdev,
861 struct usb_device *udev,
862 const char *board_name,
863 const char *driver_name)
865 mdev->dev = &udev->dev;
868 strlcpy(mdev->driver_name, driver_name,
869 sizeof(mdev->driver_name));
872 strlcpy(mdev->model, board_name, sizeof(mdev->model));
873 else if (udev->product)
874 strlcpy(mdev->model, udev->product, sizeof(mdev->model));
876 strlcpy(mdev->model, "unknown model", sizeof(mdev->model));
878 strlcpy(mdev->serial, udev->serial, sizeof(mdev->serial));
879 usb_make_path(udev, mdev->bus_info, sizeof(mdev->bus_info));
880 mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
882 media_device_init(mdev);
884 EXPORT_SYMBOL_GPL(__media_device_usb_init);
888 #endif /* CONFIG_MEDIA_CONTROLLER */