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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Media device4 *5 * Copyright (C) 2010 Nokia Corporation6 *7 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>8 * Sakari Ailus <sakari.ailus@iki.fi>9 */10 11#include <linux/compat.h>12#include <linux/export.h>13#include <linux/idr.h>14#include <linux/ioctl.h>15#include <linux/media.h>16#include <linux/slab.h>17#include <linux/types.h>18#include <linux/pci.h>19#include <linux/usb.h>20#include <linux/version.h>21 22#include <media/media-device.h>23#include <media/media-devnode.h>24#include <media/media-entity.h>25#include <media/media-request.h>26 27#ifdef CONFIG_MEDIA_CONTROLLER28 29/*30 * Legacy defines from linux/media.h. This is the only place we need this31 * so we just define it here. The media.h header doesn't expose it to the32 * kernel to prevent it from being used by drivers, but here (and only here!)33 * we need it to handle the legacy behavior.34 */35#define MEDIA_ENT_SUBTYPE_MASK 0x0000ffff36#define MEDIA_ENT_T_DEVNODE_UNKNOWN (MEDIA_ENT_F_OLD_BASE | \37 MEDIA_ENT_SUBTYPE_MASK)38 39/* -----------------------------------------------------------------------------40 * Userspace API41 */42 43static inline void __user *media_get_uptr(__u64 arg)44{45 return (void __user *)(uintptr_t)arg;46}47 48static int media_device_open(struct file *filp)49{50 return 0;51}52 53static int media_device_close(struct file *filp)54{55 return 0;56}57 58static long media_device_get_info(struct media_device *dev, void *arg)59{60 struct media_device_info *info = arg;61 62 memset(info, 0, sizeof(*info));63 64 if (dev->driver_name[0])65 strscpy(info->driver, dev->driver_name, sizeof(info->driver));66 else67 strscpy(info->driver, dev->dev->driver->name,68 sizeof(info->driver));69 70 strscpy(info->model, dev->model, sizeof(info->model));71 strscpy(info->serial, dev->serial, sizeof(info->serial));72 strscpy(info->bus_info, dev->bus_info, sizeof(info->bus_info));73 74 info->media_version = LINUX_VERSION_CODE;75 info->driver_version = info->media_version;76 info->hw_revision = dev->hw_revision;77 78 return 0;79}80 81static struct media_entity *find_entity(struct media_device *mdev, u32 id)82{83 struct media_entity *entity;84 int next = id & MEDIA_ENT_ID_FLAG_NEXT;85 86 id &= ~MEDIA_ENT_ID_FLAG_NEXT;87 88 media_device_for_each_entity(entity, mdev) {89 if (((media_entity_id(entity) == id) && !next) ||90 ((media_entity_id(entity) > id) && next)) {91 return entity;92 }93 }94 95 return NULL;96}97 98static long media_device_enum_entities(struct media_device *mdev, void *arg)99{100 struct media_entity_desc *entd = arg;101 struct media_entity *ent;102 103 ent = find_entity(mdev, entd->id);104 if (ent == NULL)105 return -EINVAL;106 107 memset(entd, 0, sizeof(*entd));108 109 entd->id = media_entity_id(ent);110 if (ent->name)111 strscpy(entd->name, ent->name, sizeof(entd->name));112 entd->type = ent->function;113 entd->revision = 0; /* Unused */114 entd->flags = ent->flags;115 entd->group_id = 0; /* Unused */116 entd->pads = ent->num_pads;117 entd->links = ent->num_links - ent->num_backlinks;118 119 /*120 * Workaround for a bug at media-ctl <= v1.10 that makes it to121 * do the wrong thing if the entity function doesn't belong to122 * either MEDIA_ENT_F_OLD_BASE or MEDIA_ENT_F_OLD_SUBDEV_BASE123 * Ranges.124 *125 * Non-subdevices are expected to be at the MEDIA_ENT_F_OLD_BASE,126 * or, otherwise, will be silently ignored by media-ctl when127 * printing the graphviz diagram. So, map them into the devnode128 * old range.129 */130 if (ent->function < MEDIA_ENT_F_OLD_BASE ||131 ent->function > MEDIA_ENT_F_TUNER) {132 if (is_media_entity_v4l2_subdev(ent))133 entd->type = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;134 else if (ent->function != MEDIA_ENT_F_IO_V4L)135 entd->type = MEDIA_ENT_T_DEVNODE_UNKNOWN;136 }137 138 memcpy(&entd->raw, &ent->info, sizeof(ent->info));139 140 return 0;141}142 143static void media_device_kpad_to_upad(const struct media_pad *kpad,144 struct media_pad_desc *upad)145{146 upad->entity = media_entity_id(kpad->entity);147 upad->index = kpad->index;148 upad->flags = kpad->flags;149}150 151static long media_device_enum_links(struct media_device *mdev, void *arg)152{153 struct media_links_enum *links = arg;154 struct media_entity *entity;155 156 entity = find_entity(mdev, links->entity);157 if (entity == NULL)158 return -EINVAL;159 160 if (links->pads) {161 unsigned int p;162 163 for (p = 0; p < entity->num_pads; p++) {164 struct media_pad_desc pad;165 166 memset(&pad, 0, sizeof(pad));167 media_device_kpad_to_upad(&entity->pads[p], &pad);168 if (copy_to_user(&links->pads[p], &pad, sizeof(pad)))169 return -EFAULT;170 }171 }172 173 if (links->links) {174 struct media_link *link;175 struct media_link_desc __user *ulink_desc = links->links;176 177 list_for_each_entry(link, &entity->links, list) {178 struct media_link_desc klink_desc;179 180 /* Ignore backlinks. */181 if (link->source->entity != entity)182 continue;183 memset(&klink_desc, 0, sizeof(klink_desc));184 media_device_kpad_to_upad(link->source,185 &klink_desc.source);186 media_device_kpad_to_upad(link->sink,187 &klink_desc.sink);188 klink_desc.flags = link->flags;189 if (copy_to_user(ulink_desc, &klink_desc,190 sizeof(*ulink_desc)))191 return -EFAULT;192 ulink_desc++;193 }194 }195 memset(links->reserved, 0, sizeof(links->reserved));196 197 return 0;198}199 200static long media_device_setup_link(struct media_device *mdev, void *arg)201{202 struct media_link_desc *linkd = arg;203 struct media_link *link = NULL;204 struct media_entity *source;205 struct media_entity *sink;206 207 /* Find the source and sink entities and link.208 */209 source = find_entity(mdev, linkd->source.entity);210 sink = find_entity(mdev, linkd->sink.entity);211 212 if (source == NULL || sink == NULL)213 return -EINVAL;214 215 if (linkd->source.index >= source->num_pads ||216 linkd->sink.index >= sink->num_pads)217 return -EINVAL;218 219 link = media_entity_find_link(&source->pads[linkd->source.index],220 &sink->pads[linkd->sink.index]);221 if (link == NULL)222 return -EINVAL;223 224 memset(linkd->reserved, 0, sizeof(linkd->reserved));225 226 /* Setup the link on both entities. */227 return __media_entity_setup_link(link, linkd->flags);228}229 230static long media_device_get_topology(struct media_device *mdev, void *arg)231{232 struct media_v2_topology *topo = arg;233 struct media_entity *entity;234 struct media_interface *intf;235 struct media_pad *pad;236 struct media_link *link;237 struct media_v2_entity kentity, __user *uentity;238 struct media_v2_interface kintf, __user *uintf;239 struct media_v2_pad kpad, __user *upad;240 struct media_v2_link klink, __user *ulink;241 unsigned int i;242 int ret = 0;243 244 topo->topology_version = mdev->topology_version;245 246 /* Get entities and number of entities */247 i = 0;248 uentity = media_get_uptr(topo->ptr_entities);249 media_device_for_each_entity(entity, mdev) {250 i++;251 if (ret || !uentity)252 continue;253 254 if (i > topo->num_entities) {255 ret = -ENOSPC;256 continue;257 }258 259 /* Copy fields to userspace struct if not error */260 memset(&kentity, 0, sizeof(kentity));261 kentity.id = entity->graph_obj.id;262 kentity.function = entity->function;263 kentity.flags = entity->flags;264 strscpy(kentity.name, entity->name,265 sizeof(kentity.name));266 267 if (copy_to_user(uentity, &kentity, sizeof(kentity)))268 ret = -EFAULT;269 uentity++;270 }271 topo->num_entities = i;272 topo->reserved1 = 0;273 274 /* Get interfaces and number of interfaces */275 i = 0;276 uintf = media_get_uptr(topo->ptr_interfaces);277 media_device_for_each_intf(intf, mdev) {278 i++;279 if (ret || !uintf)280 continue;281 282 if (i > topo->num_interfaces) {283 ret = -ENOSPC;284 continue;285 }286 287 memset(&kintf, 0, sizeof(kintf));288 289 /* Copy intf fields to userspace struct */290 kintf.id = intf->graph_obj.id;291 kintf.intf_type = intf->type;292 kintf.flags = intf->flags;293 294 if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {295 struct media_intf_devnode *devnode;296 297 devnode = intf_to_devnode(intf);298 299 kintf.devnode.major = devnode->major;300 kintf.devnode.minor = devnode->minor;301 }302 303 if (copy_to_user(uintf, &kintf, sizeof(kintf)))304 ret = -EFAULT;305 uintf++;306 }307 topo->num_interfaces = i;308 topo->reserved2 = 0;309 310 /* Get pads and number of pads */311 i = 0;312 upad = media_get_uptr(topo->ptr_pads);313 media_device_for_each_pad(pad, mdev) {314 i++;315 if (ret || !upad)316 continue;317 318 if (i > topo->num_pads) {319 ret = -ENOSPC;320 continue;321 }322 323 memset(&kpad, 0, sizeof(kpad));324 325 /* Copy pad fields to userspace struct */326 kpad.id = pad->graph_obj.id;327 kpad.entity_id = pad->entity->graph_obj.id;328 kpad.flags = pad->flags;329 kpad.index = pad->index;330 331 if (copy_to_user(upad, &kpad, sizeof(kpad)))332 ret = -EFAULT;333 upad++;334 }335 topo->num_pads = i;336 topo->reserved3 = 0;337 338 /* Get links and number of links */339 i = 0;340 ulink = media_get_uptr(topo->ptr_links);341 media_device_for_each_link(link, mdev) {342 if (link->is_backlink)343 continue;344 345 i++;346 347 if (ret || !ulink)348 continue;349 350 if (i > topo->num_links) {351 ret = -ENOSPC;352 continue;353 }354 355 memset(&klink, 0, sizeof(klink));356 357 /* Copy link fields to userspace struct */358 klink.id = link->graph_obj.id;359 klink.source_id = link->gobj0->id;360 klink.sink_id = link->gobj1->id;361 klink.flags = link->flags;362 363 if (copy_to_user(ulink, &klink, sizeof(klink)))364 ret = -EFAULT;365 ulink++;366 }367 topo->num_links = i;368 topo->reserved4 = 0;369 370 return ret;371}372 373static long media_device_request_alloc(struct media_device *mdev, void *arg)374{375 int *alloc_fd = arg;376 377 if (!mdev->ops || !mdev->ops->req_validate || !mdev->ops->req_queue)378 return -ENOTTY;379 380 return media_request_alloc(mdev, alloc_fd);381}382 383static long copy_arg_from_user(void *karg, void __user *uarg, unsigned int cmd)384{385 if ((_IOC_DIR(cmd) & _IOC_WRITE) &&386 copy_from_user(karg, uarg, _IOC_SIZE(cmd)))387 return -EFAULT;388 389 return 0;390}391 392static long copy_arg_to_user(void __user *uarg, void *karg, unsigned int cmd)393{394 if ((_IOC_DIR(cmd) & _IOC_READ) &&395 copy_to_user(uarg, karg, _IOC_SIZE(cmd)))396 return -EFAULT;397 398 return 0;399}400 401/* Do acquire the graph mutex */402#define MEDIA_IOC_FL_GRAPH_MUTEX BIT(0)403 404#define MEDIA_IOC_ARG(__cmd, func, fl, from_user, to_user) \405 [_IOC_NR(MEDIA_IOC_##__cmd)] = { \406 .cmd = MEDIA_IOC_##__cmd, \407 .fn = func, \408 .flags = fl, \409 .arg_from_user = from_user, \410 .arg_to_user = to_user, \411 }412 413#define MEDIA_IOC(__cmd, func, fl) \414 MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user)415 416/* the table is indexed by _IOC_NR(cmd) */417struct media_ioctl_info {418 unsigned int cmd;419 unsigned short flags;420 long (*fn)(struct media_device *dev, void *arg);421 long (*arg_from_user)(void *karg, void __user *uarg, unsigned int cmd);422 long (*arg_to_user)(void __user *uarg, void *karg, unsigned int cmd);423};424 425static const struct media_ioctl_info ioctl_info[] = {426 MEDIA_IOC(DEVICE_INFO, media_device_get_info, MEDIA_IOC_FL_GRAPH_MUTEX),427 MEDIA_IOC(ENUM_ENTITIES, media_device_enum_entities, MEDIA_IOC_FL_GRAPH_MUTEX),428 MEDIA_IOC(ENUM_LINKS, media_device_enum_links, MEDIA_IOC_FL_GRAPH_MUTEX),429 MEDIA_IOC(SETUP_LINK, media_device_setup_link, MEDIA_IOC_FL_GRAPH_MUTEX),430 MEDIA_IOC(G_TOPOLOGY, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX),431 MEDIA_IOC(REQUEST_ALLOC, media_device_request_alloc, 0),432};433 434static long media_device_ioctl(struct file *filp, unsigned int cmd,435 unsigned long __arg)436{437 struct media_devnode *devnode = media_devnode_data(filp);438 struct media_device *dev = devnode->media_dev;439 const struct media_ioctl_info *info;440 void __user *arg = (void __user *)__arg;441 char __karg[256], *karg = __karg;442 long ret;443 444 if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info)445 || ioctl_info[_IOC_NR(cmd)].cmd != cmd)446 return -ENOIOCTLCMD;447 448 info = &ioctl_info[_IOC_NR(cmd)];449 450 if (_IOC_SIZE(info->cmd) > sizeof(__karg)) {451 karg = kmalloc(_IOC_SIZE(info->cmd), GFP_KERNEL);452 if (!karg)453 return -ENOMEM;454 }455 456 if (info->arg_from_user) {457 ret = info->arg_from_user(karg, arg, cmd);458 if (ret)459 goto out_free;460 }461 462 if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)463 mutex_lock(&dev->graph_mutex);464 465 ret = info->fn(dev, karg);466 467 if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)468 mutex_unlock(&dev->graph_mutex);469 470 if (!ret && info->arg_to_user)471 ret = info->arg_to_user(arg, karg, cmd);472 473out_free:474 if (karg != __karg)475 kfree(karg);476 477 return ret;478}479 480#ifdef CONFIG_COMPAT481 482struct media_links_enum32 {483 __u32 entity;484 compat_uptr_t pads; /* struct media_pad_desc * */485 compat_uptr_t links; /* struct media_link_desc * */486 __u32 reserved[4];487};488 489static long media_device_enum_links32(struct media_device *mdev,490 struct media_links_enum32 __user *ulinks)491{492 struct media_links_enum links;493 compat_uptr_t pads_ptr, links_ptr;494 int ret;495 496 memset(&links, 0, sizeof(links));497 498 if (get_user(links.entity, &ulinks->entity)499 || get_user(pads_ptr, &ulinks->pads)500 || get_user(links_ptr, &ulinks->links))501 return -EFAULT;502 503 links.pads = compat_ptr(pads_ptr);504 links.links = compat_ptr(links_ptr);505 506 ret = media_device_enum_links(mdev, &links);507 if (ret)508 return ret;509 510 if (copy_to_user(ulinks->reserved, links.reserved,511 sizeof(ulinks->reserved)))512 return -EFAULT;513 return 0;514}515 516#define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct media_links_enum32)517 518static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,519 unsigned long arg)520{521 struct media_devnode *devnode = media_devnode_data(filp);522 struct media_device *dev = devnode->media_dev;523 long ret;524 525 switch (cmd) {526 case MEDIA_IOC_ENUM_LINKS32:527 mutex_lock(&dev->graph_mutex);528 ret = media_device_enum_links32(dev,529 (struct media_links_enum32 __user *)arg);530 mutex_unlock(&dev->graph_mutex);531 break;532 533 default:534 return media_device_ioctl(filp, cmd, arg);535 }536 537 return ret;538}539#endif /* CONFIG_COMPAT */540 541static const struct media_file_operations media_device_fops = {542 .owner = THIS_MODULE,543 .open = media_device_open,544 .ioctl = media_device_ioctl,545#ifdef CONFIG_COMPAT546 .compat_ioctl = media_device_compat_ioctl,547#endif /* CONFIG_COMPAT */548 .release = media_device_close,549};550 551/* -----------------------------------------------------------------------------552 * sysfs553 */554 555static ssize_t model_show(struct device *cd,556 struct device_attribute *attr, char *buf)557{558 struct media_devnode *devnode = to_media_devnode(cd);559 struct media_device *mdev = devnode->media_dev;560 561 return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);562}563 564static DEVICE_ATTR_RO(model);565 566/* -----------------------------------------------------------------------------567 * Registration/unregistration568 */569 570static void media_device_release(struct media_devnode *devnode)571{572 dev_dbg(devnode->parent, "Media device released\n");573}574 575static void __media_device_unregister_entity(struct media_entity *entity)576{577 struct media_device *mdev = entity->graph_obj.mdev;578 struct media_link *link, *tmp;579 struct media_interface *intf;580 struct media_pad *iter;581 582 ida_free(&mdev->entity_internal_idx, entity->internal_idx);583 584 /* Remove all interface links pointing to this entity */585 list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) {586 list_for_each_entry_safe(link, tmp, &intf->links, list) {587 if (link->entity == entity)588 __media_remove_intf_link(link);589 }590 }591 592 /* Remove all data links that belong to this entity */593 __media_entity_remove_links(entity);594 595 /* Remove all pads that belong to this entity */596 media_entity_for_each_pad(entity, iter)597 media_gobj_destroy(&iter->graph_obj);598 599 /* Remove the entity */600 media_gobj_destroy(&entity->graph_obj);601 602 /* invoke entity_notify callbacks to handle entity removal?? */603}604 605int __must_check media_device_register_entity(struct media_device *mdev,606 struct media_entity *entity)607{608 struct media_entity_notify *notify, *next;609 struct media_pad *iter;610 int ret;611 612 if (entity->function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN ||613 entity->function == MEDIA_ENT_F_UNKNOWN)614 dev_warn(mdev->dev,615 "Entity type for entity %s was not initialized!\n",616 entity->name);617 618 /* Warn if we apparently re-register an entity */619 WARN_ON(entity->graph_obj.mdev != NULL);620 entity->graph_obj.mdev = mdev;621 INIT_LIST_HEAD(&entity->links);622 entity->num_links = 0;623 entity->num_backlinks = 0;624 625 ret = ida_alloc_min(&mdev->entity_internal_idx, 1, GFP_KERNEL);626 if (ret < 0)627 return ret;628 entity->internal_idx = ret;629 630 mutex_lock(&mdev->graph_mutex);631 mdev->entity_internal_idx_max =632 max(mdev->entity_internal_idx_max, entity->internal_idx);633 634 /* Initialize media_gobj embedded at the entity */635 media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);636 637 /* Initialize objects at the pads */638 media_entity_for_each_pad(entity, iter)639 media_gobj_create(mdev, MEDIA_GRAPH_PAD, &iter->graph_obj);640 641 /* invoke entity_notify callbacks */642 list_for_each_entry_safe(notify, next, &mdev->entity_notify, list)643 notify->notify(entity, notify->notify_data);644 645 if (mdev->entity_internal_idx_max646 >= mdev->pm_count_walk.ent_enum.idx_max) {647 struct media_graph new = { .top = 0 };648 649 /*650 * Initialise the new graph walk before cleaning up651 * the old one in order not to spoil the graph walk652 * object of the media device if graph walk init fails.653 */654 ret = media_graph_walk_init(&new, mdev);655 if (ret) {656 __media_device_unregister_entity(entity);657 mutex_unlock(&mdev->graph_mutex);658 return ret;659 }660 media_graph_walk_cleanup(&mdev->pm_count_walk);661 mdev->pm_count_walk = new;662 }663 mutex_unlock(&mdev->graph_mutex);664 665 return 0;666}667EXPORT_SYMBOL_GPL(media_device_register_entity);668 669void media_device_unregister_entity(struct media_entity *entity)670{671 struct media_device *mdev = entity->graph_obj.mdev;672 673 if (mdev == NULL)674 return;675 676 mutex_lock(&mdev->graph_mutex);677 __media_device_unregister_entity(entity);678 mutex_unlock(&mdev->graph_mutex);679}680EXPORT_SYMBOL_GPL(media_device_unregister_entity);681 682void media_device_init(struct media_device *mdev)683{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);689 690 mutex_init(&mdev->req_queue_mutex);691 mutex_init(&mdev->graph_mutex);692 ida_init(&mdev->entity_internal_idx);693 694 atomic_set(&mdev->request_id, 0);695 696 if (!*mdev->bus_info)697 media_set_bus_info(mdev->bus_info, sizeof(mdev->bus_info),698 mdev->dev);699 700 dev_dbg(mdev->dev, "Media device initialized\n");701}702EXPORT_SYMBOL_GPL(media_device_init);703 704void media_device_cleanup(struct media_device *mdev)705{706 ida_destroy(&mdev->entity_internal_idx);707 mdev->entity_internal_idx_max = 0;708 media_graph_walk_cleanup(&mdev->pm_count_walk);709 mutex_destroy(&mdev->graph_mutex);710 mutex_destroy(&mdev->req_queue_mutex);711}712EXPORT_SYMBOL_GPL(media_device_cleanup);713 714int __must_check __media_device_register(struct media_device *mdev,715 struct module *owner)716{717 struct media_devnode *devnode;718 int ret;719 720 devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);721 if (!devnode)722 return -ENOMEM;723 724 /* Register the device node. */725 mdev->devnode = devnode;726 devnode->fops = &media_device_fops;727 devnode->parent = mdev->dev;728 devnode->release = media_device_release;729 730 /* Set version 0 to indicate user-space that the graph is static */731 mdev->topology_version = 0;732 733 ret = media_devnode_register(mdev, devnode, owner);734 if (ret < 0) {735 /* devnode free is handled in media_devnode_*() */736 mdev->devnode = NULL;737 return ret;738 }739 740 ret = device_create_file(&devnode->dev, &dev_attr_model);741 if (ret < 0) {742 /* devnode free is handled in media_devnode_*() */743 mdev->devnode = NULL;744 media_devnode_unregister_prepare(devnode);745 media_devnode_unregister(devnode);746 return ret;747 }748 749 dev_dbg(mdev->dev, "Media device registered\n");750 751 return 0;752}753EXPORT_SYMBOL_GPL(__media_device_register);754 755void media_device_register_entity_notify(struct media_device *mdev,756 struct media_entity_notify *nptr)757{758 mutex_lock(&mdev->graph_mutex);759 list_add_tail(&nptr->list, &mdev->entity_notify);760 mutex_unlock(&mdev->graph_mutex);761}762EXPORT_SYMBOL_GPL(media_device_register_entity_notify);763 764/*765 * Note: Should be called with mdev->lock held.766 */767static void __media_device_unregister_entity_notify(struct media_device *mdev,768 struct media_entity_notify *nptr)769{770 list_del(&nptr->list);771}772 773void media_device_unregister_entity_notify(struct media_device *mdev,774 struct media_entity_notify *nptr)775{776 mutex_lock(&mdev->graph_mutex);777 __media_device_unregister_entity_notify(mdev, nptr);778 mutex_unlock(&mdev->graph_mutex);779}780EXPORT_SYMBOL_GPL(media_device_unregister_entity_notify);781 782void media_device_unregister(struct media_device *mdev)783{784 struct media_entity *entity;785 struct media_entity *next;786 struct media_interface *intf, *tmp_intf;787 struct media_entity_notify *notify, *nextp;788 789 if (mdev == NULL)790 return;791 792 mutex_lock(&mdev->graph_mutex);793 794 /* Check if mdev was ever registered at all */795 if (!media_devnode_is_registered(mdev->devnode)) {796 mutex_unlock(&mdev->graph_mutex);797 return;798 }799 800 /* Clear the devnode register bit to avoid races with media dev open */801 media_devnode_unregister_prepare(mdev->devnode);802 803 /* Remove all entities from the media device */804 list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)805 __media_device_unregister_entity(entity);806 807 /* Remove all entity_notify callbacks from the media device */808 list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list)809 __media_device_unregister_entity_notify(mdev, notify);810 811 /* Remove all interfaces from the media device */812 list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,813 graph_obj.list) {814 /*815 * Unlink the interface, but don't free it here; the816 * module which created it is responsible for freeing817 * it818 */819 __media_remove_intf_links(intf);820 media_gobj_destroy(&intf->graph_obj);821 }822 823 mutex_unlock(&mdev->graph_mutex);824 825 dev_dbg(mdev->dev, "Media device unregistered\n");826 827 device_remove_file(&mdev->devnode->dev, &dev_attr_model);828 media_devnode_unregister(mdev->devnode);829 /* devnode free is handled in media_devnode_*() */830 mdev->devnode = NULL;831}832EXPORT_SYMBOL_GPL(media_device_unregister);833 834#if IS_ENABLED(CONFIG_PCI)835void media_device_pci_init(struct media_device *mdev,836 struct pci_dev *pci_dev,837 const char *name)838{839 mdev->dev = &pci_dev->dev;840 841 if (name)842 strscpy(mdev->model, name, sizeof(mdev->model));843 else844 strscpy(mdev->model, pci_name(pci_dev), sizeof(mdev->model));845 846 sprintf(mdev->bus_info, "PCI:%s", pci_name(pci_dev));847 848 mdev->hw_revision = (pci_dev->subsystem_vendor << 16)849 | pci_dev->subsystem_device;850 851 media_device_init(mdev);852}853EXPORT_SYMBOL_GPL(media_device_pci_init);854#endif855 856#if IS_ENABLED(CONFIG_USB)857void __media_device_usb_init(struct media_device *mdev,858 struct usb_device *udev,859 const char *board_name,860 const char *driver_name)861{862 mdev->dev = &udev->dev;863 864 if (driver_name)865 strscpy(mdev->driver_name, driver_name,866 sizeof(mdev->driver_name));867 868 if (board_name)869 strscpy(mdev->model, board_name, sizeof(mdev->model));870 else if (udev->product)871 strscpy(mdev->model, udev->product, sizeof(mdev->model));872 else873 strscpy(mdev->model, "unknown model", sizeof(mdev->model));874 if (udev->serial)875 strscpy(mdev->serial, udev->serial, sizeof(mdev->serial));876 usb_make_path(udev, mdev->bus_info, sizeof(mdev->bus_info));877 mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);878 879 media_device_init(mdev);880}881EXPORT_SYMBOL_GPL(__media_device_usb_init);882#endif883 884 885#endif /* CONFIG_MEDIA_CONTROLLER */886