drivers/media/media-device.c

   1 /*
   2  * Media device
   3  *
   4  * Copyright (C) 2010 Nokia Corporation
   5  *
   6  * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
   7  *           Sakari Ailus <sakari.ailus@iki.fi>
   8  *
   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.
  12  *
  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.
  17  *
  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
  21  */
  22
  23 #include <linux/compat.h>
  24 #include <linux/export.h>
  25 #include <linux/idr.h>
  26 #include <linux/ioctl.h>
  27 #include <linux/media.h>
  28 #include <linux/slab.h>
  29 #include <linux/types.h>
  30 #include <linux/pci.h>
  31 #include <linux/usb.h>
  32
  33 #include <media/media-device.h>
  34 #include <media/media-devnode.h>
  35 #include <media/media-entity.h>
  36
  37 #ifdef CONFIG_MEDIA_CONTROLLER
  38
  39 /* -----------------------------------------------------------------------------
  40  * Userspace API
  41  */
  42
  43 static int media_device_open(struct file *filp)
  44 {
  45         return 0;
  46 }
  47
  48 static int media_device_close(struct file *filp)
  49 {
  50         return 0;
  51 }
  52
  53 static int media_device_get_info(struct media_device *dev,
  54                                  struct media_device_info __user *__info)
  55 {
  56         struct media_device_info info;
  57
  58         memset(&info, 0, sizeof(info));
  59
  60         if (dev->driver_name[0])
  61                 strlcpy(info.driver, dev->driver_name, sizeof(info.driver));
  62         else
  63                 strlcpy(info.driver, dev->dev->driver->name, sizeof(info.driver));
  64
  65         strlcpy(info.model, dev->model, sizeof(info.model));
  66         strlcpy(info.serial, dev->serial, sizeof(info.serial));
  67         strlcpy(info.bus_info, dev->bus_info, sizeof(info.bus_info));
  68
  69         info.media_version = MEDIA_API_VERSION;
  70         info.hw_revision = dev->hw_revision;
  71         info.driver_version = dev->driver_version;
  72
  73         if (copy_to_user(__info, &info, sizeof(*__info)))
  74                 return -EFAULT;
  75         return 0;
  76 }
  77
  78 static struct media_entity *find_entity(struct media_device *mdev, u32 id)
  79 {
  80         struct media_entity *entity;
  81         int next = id & MEDIA_ENT_ID_FLAG_NEXT;
  82
  83         id &= ~MEDIA_ENT_ID_FLAG_NEXT;
  84
  85         spin_lock(&mdev->lock);
  86
  87         media_device_for_each_entity(entity, mdev) {
  88                 if (((media_entity_id(entity) == id) && !next) ||
  89                     ((media_entity_id(entity) > id) && next)) {
  90                         spin_unlock(&mdev->lock);
  91                         return entity;
  92                 }
  93         }
  94
  95         spin_unlock(&mdev->lock);
  96
  97         return NULL;
  98 }
  99
 100 static long media_device_enum_entities(struct media_device *mdev,
 101                                        struct media_entity_desc __user *uent)
 102 {
 103         struct media_entity *ent;
 104         struct media_entity_desc u_ent;
 105
 106         memset(&u_ent, 0, sizeof(u_ent));
 107         if (copy_from_user(&u_ent.id, &uent->id, sizeof(u_ent.id)))
 108                 return -EFAULT;
 109
 110         ent = find_entity(mdev, u_ent.id);
 111
 112         if (ent == NULL)
 113                 return -EINVAL;
 114
 115         u_ent.id = media_entity_id(ent);
 116         if (ent->name)
 117                 strlcpy(u_ent.name, ent->name, sizeof(u_ent.name));
 118         u_ent.type = ent->function;
 119         u_ent.revision = 0;             /* Unused */
 120         u_ent.flags = ent->flags;
 121         u_ent.group_id = 0;             /* Unused */
 122         u_ent.pads = ent->num_pads;
 123         u_ent.links = ent->num_links - ent->num_backlinks;
 124         memcpy(&u_ent.raw, &ent->info, sizeof(ent->info));
 125         if (copy_to_user(uent, &u_ent, sizeof(u_ent)))
 126                 return -EFAULT;
 127         return 0;
 128 }
 129
 130 static void media_device_kpad_to_upad(const struct media_pad *kpad,
 131                                       struct media_pad_desc *upad)
 132 {
 133         upad->entity = media_entity_id(kpad->entity);
 134         upad->index = kpad->index;
 135         upad->flags = kpad->flags;
 136 }
 137
 138 static long __media_device_enum_links(struct media_device *mdev,
 139                                       struct media_links_enum *links)
 140 {
 141         struct media_entity *entity;
 142
 143         entity = find_entity(mdev, links->entity);
 144         if (entity == NULL)
 145                 return -EINVAL;
 146
 147         if (links->pads) {
 148                 unsigned int p;
 149
 150                 for (p = 0; p < entity->num_pads; p++) {
 151                         struct media_pad_desc pad;
 152
 153                         memset(&pad, 0, sizeof(pad));
 154                         media_device_kpad_to_upad(&entity->pads[p], &pad);
 155                         if (copy_to_user(&links->pads[p], &pad, sizeof(pad)))
 156                                 return -EFAULT;
 157                 }
 158         }
 159
 160         if (links->links) {
 161                 struct media_link *link;
 162                 struct media_link_desc __user *ulink_desc = links->links;
 163
 164                 list_for_each_entry(link, &entity->links, list) {
 165                         struct media_link_desc klink_desc;
 166
 167                         /* Ignore backlinks. */
 168                         if (link->source->entity != entity)
 169                                 continue;
 170                         memset(&klink_desc, 0, sizeof(klink_desc));
 171                         media_device_kpad_to_upad(link->source,
 172                                                   &klink_desc.source);
 173                         media_device_kpad_to_upad(link->sink,
 174                                                   &klink_desc.sink);
 175                         klink_desc.flags = link->flags;
 176                         if (copy_to_user(ulink_desc, &klink_desc,
 177                                          sizeof(*ulink_desc)))
 178                                 return -EFAULT;
 179                         ulink_desc++;
 180                 }
 181         }
 182
 183         return 0;
 184 }
 185
 186 static long media_device_enum_links(struct media_device *mdev,
 187                                     struct media_links_enum __user *ulinks)
 188 {
 189         struct media_links_enum links;
 190         int rval;
 191
 192         if (copy_from_user(&links, ulinks, sizeof(links)))
 193                 return -EFAULT;
 194
 195         rval = __media_device_enum_links(mdev, &links);
 196         if (rval < 0)
 197                 return rval;
 198
 199         if (copy_to_user(ulinks, &links, sizeof(*ulinks)))
 200                 return -EFAULT;
 201
 202         return 0;
 203 }
 204
 205 static long media_device_setup_link(struct media_device *mdev,
 206                                     struct media_link_desc __user *_ulink)
 207 {
 208         struct media_link *link = NULL;
 209         struct media_link_desc ulink;
 210         struct media_entity *source;
 211         struct media_entity *sink;
 212         int ret;
 213
 214         if (copy_from_user(&ulink, _ulink, sizeof(ulink)))
 215                 return -EFAULT;
 216
 217         /* Find the source and sink entities and link.
 218          */
 219         source = find_entity(mdev, ulink.source.entity);
 220         sink = find_entity(mdev, ulink.sink.entity);
 221
 222         if (source == NULL || sink == NULL)
 223                 return -EINVAL;
 224
 225         if (ulink.source.index >= source->num_pads ||
 226             ulink.sink.index >= sink->num_pads)
 227                 return -EINVAL;
 228
 229         link = media_entity_find_link(&source->pads[ulink.source.index],
 230                                       &sink->pads[ulink.sink.index]);
 231         if (link == NULL)
 232                 return -EINVAL;
 233
 234         /* Setup the link on both entities. */
 235         ret = __media_entity_setup_link(link, ulink.flags);
 236
 237         if (copy_to_user(_ulink, &ulink, sizeof(ulink)))
 238                 return -EFAULT;
 239
 240         return ret;
 241 }
 242
 243 static long __media_device_get_topology(struct media_device *mdev,
 244                                       struct media_v2_topology *topo)
 245 {
 246         struct media_entity *entity;
 247         struct media_interface *intf;
 248         struct media_pad *pad;
 249         struct media_link *link;
 250         struct media_v2_entity kentity, *uentity;
 251         struct media_v2_interface kintf, *uintf;
 252         struct media_v2_pad kpad, *upad;
 253         struct media_v2_link klink, *ulink;
 254         unsigned int i;
 255         int ret = 0;
 256
 257         topo->topology_version = mdev->topology_version;
 258
 259         /* Get entities and number of entities */
 260         i = 0;
 261         uentity = media_get_uptr(topo->ptr_entities);
 262         media_device_for_each_entity(entity, mdev) {
 263                 i++;
 264                 if (ret || !uentity)
 265                         continue;
 266
 267                 if (i > topo->num_entities) {
 268                         ret = -ENOSPC;
 269                         continue;
 270                 }
 271
 272                 /* Copy fields to userspace struct if not error */
 273                 memset(&kentity, 0, sizeof(kentity));
 274                 kentity.id = entity->graph_obj.id;
 275                 kentity.function = entity->function;
 276                 strncpy(kentity.name, entity->name,
 277                         sizeof(kentity.name));
 278
 279                 if (copy_to_user(uentity, &kentity, sizeof(kentity)))
 280                         ret = -EFAULT;
 281                 uentity++;
 282         }
 283         topo->num_entities = i;
 284
 285         /* Get interfaces and number of interfaces */
 286         i = 0;
 287         uintf = media_get_uptr(topo->ptr_interfaces);
 288         media_device_for_each_intf(intf, mdev) {
 289                 i++;
 290                 if (ret || !uintf)
 291                         continue;
 292
 293                 if (i > topo->num_interfaces) {
 294                         ret = -ENOSPC;
 295                         continue;
 296                 }
 297
 298                 memset(&kintf, 0, sizeof(kintf));
 299
 300                 /* Copy intf fields to userspace struct */
 301                 kintf.id = intf->graph_obj.id;
 302                 kintf.intf_type = intf->type;
 303                 kintf.flags = intf->flags;
 304
 305                 if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {
 306                         struct media_intf_devnode *devnode;
 307
 308                         devnode = intf_to_devnode(intf);
 309
 310                         kintf.devnode.major = devnode->major;
 311                         kintf.devnode.minor = devnode->minor;
 312                 }
 313
 314                 if (copy_to_user(uintf, &kintf, sizeof(kintf)))
 315                         ret = -EFAULT;
 316                 uintf++;
 317         }
 318         topo->num_interfaces = i;
 319
 320         /* Get pads and number of pads */
 321         i = 0;
 322         upad = media_get_uptr(topo->ptr_pads);
 323         media_device_for_each_pad(pad, mdev) {
 324                 i++;
 325                 if (ret || !upad)
 326                         continue;
 327
 328                 if (i > topo->num_pads) {
 329                         ret = -ENOSPC;
 330                         continue;
 331                 }
 332
 333                 memset(&kpad, 0, sizeof(kpad));
 334
 335                 /* Copy pad fields to userspace struct */
 336                 kpad.id = pad->graph_obj.id;
 337                 kpad.entity_id = pad->entity->graph_obj.id;
 338                 kpad.flags = pad->flags;
 339
 340                 if (copy_to_user(upad, &kpad, sizeof(kpad)))
 341                         ret = -EFAULT;
 342                 upad++;
 343         }
 344         topo->num_pads = i;
 345
 346         /* Get links and number of links */
 347         i = 0;
 348         ulink = media_get_uptr(topo->ptr_links);
 349         media_device_for_each_link(link, mdev) {
 350                 if (link->is_backlink)
 351                         continue;
 352
 353                 i++;
 354
 355                 if (ret || !ulink)
 356                         continue;
 357
 358                 if (i > topo->num_links) {
 359                         ret = -ENOSPC;
 360                         continue;
 361                 }
 362
 363                 memset(&klink, 0, sizeof(klink));
 364
 365                 /* Copy link fields to userspace struct */
 366                 klink.id = link->graph_obj.id;
 367                 klink.source_id = link->gobj0->id;
 368                 klink.sink_id = link->gobj1->id;
 369                 klink.flags = link->flags;
 370
 371                 if (copy_to_user(ulink, &klink, sizeof(klink)))
 372                         ret = -EFAULT;
 373                 ulink++;
 374         }
 375         topo->num_links = i;
 376
 377         return ret;
 378 }
 379
 380 static long media_device_get_topology(struct media_device *mdev,
 381                                       struct media_v2_topology __user *utopo)
 382 {
 383         struct media_v2_topology ktopo;
 384         int ret;
 385
 386         if (copy_from_user(&ktopo, utopo, sizeof(ktopo)))
 387                 return -EFAULT;
 388
 389         ret = __media_device_get_topology(mdev, &ktopo);
 390         if (ret < 0)
 391                 return ret;
 392
 393         if (copy_to_user(utopo, &ktopo, sizeof(*utopo)))
 394                 return -EFAULT;
 395
 396         return 0;
 397 }
 398
 399 static long media_device_ioctl(struct file *filp, unsigned int cmd,
 400                                unsigned long arg)
 401 {
 402         struct media_devnode *devnode = media_devnode_data(filp);
 403         struct media_device *dev = to_media_device(devnode);
 404         long ret;
 405
 406         switch (cmd) {
 407         case MEDIA_IOC_DEVICE_INFO:
 408                 ret = media_device_get_info(dev,
 409                                 (struct media_device_info __user *)arg);
 410                 break;
 411
 412         case MEDIA_IOC_ENUM_ENTITIES:
 413                 ret = media_device_enum_entities(dev,
 414                                 (struct media_entity_desc __user *)arg);
 415                 break;
 416
 417         case MEDIA_IOC_ENUM_LINKS:
 418                 mutex_lock(&dev->graph_mutex);
 419                 ret = media_device_enum_links(dev,
 420                                 (struct media_links_enum __user *)arg);
 421                 mutex_unlock(&dev->graph_mutex);
 422                 break;
 423
 424         case MEDIA_IOC_SETUP_LINK:
 425                 mutex_lock(&dev->graph_mutex);
 426                 ret = media_device_setup_link(dev,
 427                                 (struct media_link_desc __user *)arg);
 428                 mutex_unlock(&dev->graph_mutex);
 429                 break;
 430
 431         case MEDIA_IOC_G_TOPOLOGY:
 432                 mutex_lock(&dev->graph_mutex);
 433                 ret = media_device_get_topology(dev,
 434                                 (struct media_v2_topology __user *)arg);
 435                 mutex_unlock(&dev->graph_mutex);
 436                 break;
 437
 438         default:
 439                 ret = -ENOIOCTLCMD;
 440         }
 441
 442         return ret;
 443 }
 444
 445 #ifdef CONFIG_COMPAT
 446
 447 struct media_links_enum32 {
 448         __u32 entity;
 449         compat_uptr_t pads; /* struct media_pad_desc * */
 450         compat_uptr_t links; /* struct media_link_desc * */
 451         __u32 reserved[4];
 452 };
 453
 454 static long media_device_enum_links32(struct media_device *mdev,
 455                                       struct media_links_enum32 __user *ulinks)
 456 {
 457         struct media_links_enum links;
 458         compat_uptr_t pads_ptr, links_ptr;
 459
 460         memset(&links, 0, sizeof(links));
 461
 462         if (get_user(links.entity, &ulinks->entity)
 463             || get_user(pads_ptr, &ulinks->pads)
 464             || get_user(links_ptr, &ulinks->links))
 465                 return -EFAULT;
 466
 467         links.pads = compat_ptr(pads_ptr);
 468         links.links = compat_ptr(links_ptr);
 469
 470         return __media_device_enum_links(mdev, &links);
 471 }
 472
 473 #define MEDIA_IOC_ENUM_LINKS32          _IOWR('|', 0x02, struct media_links_enum32)
 474
 475 static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
 476                                       unsigned long arg)
 477 {
 478         struct media_devnode *devnode = media_devnode_data(filp);
 479         struct media_device *dev = to_media_device(devnode);
 480         long ret;
 481
 482         switch (cmd) {
 483         case MEDIA_IOC_DEVICE_INFO:
 484         case MEDIA_IOC_ENUM_ENTITIES:
 485         case MEDIA_IOC_SETUP_LINK:
 486         case MEDIA_IOC_G_TOPOLOGY:
 487                 return media_device_ioctl(filp, cmd, arg);
 488
 489         case MEDIA_IOC_ENUM_LINKS32:
 490                 mutex_lock(&dev->graph_mutex);
 491                 ret = media_device_enum_links32(dev,
 492                                 (struct media_links_enum32 __user *)arg);
 493                 mutex_unlock(&dev->graph_mutex);
 494                 break;
 495
 496         default:
 497                 ret = -ENOIOCTLCMD;
 498         }
 499
 500         return ret;
 501 }
 502 #endif /* CONFIG_COMPAT */
 503
 504 static const struct media_file_operations media_device_fops = {
 505         .owner = THIS_MODULE,
 506         .open = media_device_open,
 507         .ioctl = media_device_ioctl,
 508 #ifdef CONFIG_COMPAT
 509         .compat_ioctl = media_device_compat_ioctl,
 510 #endif /* CONFIG_COMPAT */
 511         .release = media_device_close,
 512 };
 513
 514 /* -----------------------------------------------------------------------------
 515  * sysfs
 516  */
 517
 518 static ssize_t show_model(struct device *cd,
 519                           struct device_attribute *attr, char *buf)
 520 {
 521         struct media_device *mdev = to_media_device(to_media_devnode(cd));
 522
 523         return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
 524 }
 525
 526 static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
 527
 528 /* -----------------------------------------------------------------------------
 529  * Registration/unregistration
 530  */
 531
 532 static void media_device_release(struct media_devnode *mdev)
 533 {
 534         dev_dbg(mdev->parent, "Media device released\n");
 535 }
 536
 537 /**
 538  * media_device_register_entity - Register an entity with a media device
 539  * @mdev:       The media device
 540  * @entity:     The entity
 541  */
 542 int __must_check media_device_register_entity(struct media_device *mdev,
 543                                               struct media_entity *entity)
 544 {
 545         unsigned int i;
 546         int ret;
 547
 548         if (entity->function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN ||
 549             entity->function == MEDIA_ENT_F_UNKNOWN)
 550                 dev_warn(mdev->dev,
 551                          "Entity type for entity %s was not initialized!\n",
 552                          entity->name);
 553
 554         /* Warn if we apparently re-register an entity */
 555         WARN_ON(entity->graph_obj.mdev != NULL);
 556         entity->graph_obj.mdev = mdev;
 557         INIT_LIST_HEAD(&entity->links);
 558         entity->num_links = 0;
 559         entity->num_backlinks = 0;
 560
 561         if (!ida_pre_get(&mdev->entity_internal_idx, GFP_KERNEL))
 562                 return -ENOMEM;
 563
 564         spin_lock(&mdev->lock);
 565
 566         ret = ida_get_new_above(&mdev->entity_internal_idx, 1,
 567                                 &entity->internal_idx);
 568         if (ret < 0) {
 569                 spin_unlock(&mdev->lock);
 570                 return ret;
 571         }
 572
 573         mdev->entity_internal_idx_max =
 574                 max(mdev->entity_internal_idx_max, entity->internal_idx);
 575
 576         /* Initialize media_gobj embedded at the entity */
 577         media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
 578
 579         /* Initialize objects at the pads */
 580         for (i = 0; i < entity->num_pads; i++)
 581                 media_gobj_create(mdev, MEDIA_GRAPH_PAD,
 582                                &entity->pads[i].graph_obj);
 583
 584         spin_unlock(&mdev->lock);
 585
 586         return 0;
 587 }
 588 EXPORT_SYMBOL_GPL(media_device_register_entity);
 589
 590 static void __media_device_unregister_entity(struct media_entity *entity)
 591 {
 592         struct media_device *mdev = entity->graph_obj.mdev;
 593         struct media_link *link, *tmp;
 594         struct media_interface *intf;
 595         unsigned int i;
 596
 597         ida_simple_remove(&mdev->entity_internal_idx, entity->internal_idx);
 598
 599         /* Remove all interface links pointing to this entity */
 600         list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) {
 601                 list_for_each_entry_safe(link, tmp, &intf->links, list) {
 602                         if (link->entity == entity)
 603                                 __media_remove_intf_link(link);
 604                 }
 605         }
 606
 607         /* Remove all data links that belong to this entity */
 608         __media_entity_remove_links(entity);
 609
 610         /* Remove all pads that belong to this entity */
 611         for (i = 0; i < entity->num_pads; i++)
 612                 media_gobj_destroy(&entity->pads[i].graph_obj);
 613
 614         /* Remove the entity */
 615         media_gobj_destroy(&entity->graph_obj);
 616
 617         entity->graph_obj.mdev = NULL;
 618 }
 619
 620 void media_device_unregister_entity(struct media_entity *entity)
 621 {
 622         struct media_device *mdev = entity->graph_obj.mdev;
 623
 624         if (mdev == NULL)
 625                 return;
 626
 627         spin_lock(&mdev->lock);
 628         __media_device_unregister_entity(entity);
 629         spin_unlock(&mdev->lock);
 630 }
 631 EXPORT_SYMBOL_GPL(media_device_unregister_entity);
 632
 633 /**
 634  * media_device_init() - initialize a media device
 635  * @mdev:       The media device
 636  *
 637  * The caller is responsible for initializing the media device before
 638  * registration. The following fields must be set:
 639  *
 640  * - dev must point to the parent device
 641  * - model must be filled with the device model name
 642  */
 643 void media_device_init(struct media_device *mdev)
 644 {
 645         INIT_LIST_HEAD(&mdev->entities);
 646         INIT_LIST_HEAD(&mdev->interfaces);
 647         INIT_LIST_HEAD(&mdev->pads);
 648         INIT_LIST_HEAD(&mdev->links);
 649         spin_lock_init(&mdev->lock);
 650         mutex_init(&mdev->graph_mutex);
 651         ida_init(&mdev->entity_internal_idx);
 652
 653         dev_dbg(mdev->dev, "Media device initialized\n");
 654 }
 655 EXPORT_SYMBOL_GPL(media_device_init);
 656
 657 void media_device_cleanup(struct media_device *mdev)
 658 {
 659         ida_destroy(&mdev->entity_internal_idx);
 660         mdev->entity_internal_idx_max = 0;
 661         mutex_destroy(&mdev->graph_mutex);
 662 }
 663 EXPORT_SYMBOL_GPL(media_device_cleanup);
 664
 665 int __must_check __media_device_register(struct media_device *mdev,
 666                                          struct module *owner)
 667 {
 668         int ret;
 669
 670         /* Register the device node. */
 671         mdev->devnode.fops = &media_device_fops;
 672         mdev->devnode.parent = mdev->dev;
 673         mdev->devnode.release = media_device_release;
 674
 675         /* Set version 0 to indicate user-space that the graph is static */
 676         mdev->topology_version = 0;
 677
 678         ret = media_devnode_register(&mdev->devnode, owner);
 679         if (ret < 0)
 680                 return ret;
 681
 682         ret = device_create_file(&mdev->devnode.dev, &dev_attr_model);
 683         if (ret < 0) {
 684                 media_devnode_unregister(&mdev->devnode);
 685                 return ret;
 686         }
 687
 688         dev_dbg(mdev->dev, "Media device registered\n");
 689
 690         return 0;
 691 }
 692 EXPORT_SYMBOL_GPL(__media_device_register);
 693
 694 void media_device_unregister(struct media_device *mdev)
 695 {
 696         struct media_entity *entity;
 697         struct media_entity *next;
 698         struct media_interface *intf, *tmp_intf;
 699
 700         if (mdev == NULL)
 701                 return;
 702
 703         spin_lock(&mdev->lock);
 704
 705         /* Check if mdev was ever registered at all */
 706         if (!media_devnode_is_registered(&mdev->devnode)) {
 707                 spin_unlock(&mdev->lock);
 708                 return;
 709         }
 710
 711         /* Remove all entities from the media device */
 712         list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)
 713                 __media_device_unregister_entity(entity);
 714
 715         /* Remove all interfaces from the media device */
 716         list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,
 717                                  graph_obj.list) {
 718                 __media_remove_intf_links(intf);
 719                 media_gobj_destroy(&intf->graph_obj);
 720                 kfree(intf);
 721         }
 722
 723         spin_unlock(&mdev->lock);
 724
 725         device_remove_file(&mdev->devnode.dev, &dev_attr_model);
 726         media_devnode_unregister(&mdev->devnode);
 727
 728         dev_dbg(mdev->dev, "Media device unregistered\n");
 729 }
 730 EXPORT_SYMBOL_GPL(media_device_unregister);
 731
 732 static void media_device_release_devres(struct device *dev, void *res)
 733 {
 734 }
 735
 736 struct media_device *media_device_get_devres(struct device *dev)
 737 {
 738         struct media_device *mdev;
 739
 740         mdev = devres_find(dev, media_device_release_devres, NULL, NULL);
 741         if (mdev)
 742                 return mdev;
 743
 744         mdev = devres_alloc(media_device_release_devres,
 745                                 sizeof(struct media_device), GFP_KERNEL);
 746         if (!mdev)
 747                 return NULL;
 748         return devres_get(dev, mdev, NULL, NULL);
 749 }
 750 EXPORT_SYMBOL_GPL(media_device_get_devres);
 751
 752 struct media_device *media_device_find_devres(struct device *dev)
 753 {
 754         return devres_find(dev, media_device_release_devres, NULL, NULL);
 755 }
 756 EXPORT_SYMBOL_GPL(media_device_find_devres);
 757
 758 void media_device_pci_init(struct media_device *mdev,
 759                            struct pci_dev *pci_dev,
 760                            const char *name)
 761 {
 762 #ifdef CONFIG_PCI
 763         mdev->dev = &pci_dev->dev;
 764
 765         if (name)
 766                 strlcpy(mdev->model, name, sizeof(mdev->model));
 767         else
 768                 strlcpy(mdev->model, pci_name(pci_dev), sizeof(mdev->model));
 769
 770         sprintf(mdev->bus_info, "PCI:%s", pci_name(pci_dev));
 771
 772         mdev->hw_revision = (pci_dev->subsystem_vendor << 16)
 773                             | pci_dev->subsystem_device;
 774
 775         mdev->driver_version = LINUX_VERSION_CODE;
 776
 777         media_device_init(mdev);
 778 #endif
 779 }
 780 EXPORT_SYMBOL_GPL(media_device_pci_init);
 781
 782 void __media_device_usb_init(struct media_device *mdev,
 783                              struct usb_device *udev,
 784                              const char *board_name,
 785                              const char *driver_name)
 786 {
 787 #ifdef CONFIG_USB
 788         mdev->dev = &udev->dev;
 789
 790         if (driver_name)
 791                 strlcpy(mdev->driver_name, driver_name,
 792                         sizeof(mdev->driver_name));
 793
 794         if (board_name)
 795                 strlcpy(mdev->model, board_name, sizeof(mdev->model));
 796         else if (udev->product)
 797                 strlcpy(mdev->model, udev->product, sizeof(mdev->model));
 798         else
 799                 strlcpy(mdev->model, "unknown model", sizeof(mdev->model));
 800         if (udev->serial)
 801                 strlcpy(mdev->serial, udev->serial, sizeof(mdev->serial));
 802         usb_make_path(udev, mdev->bus_info, sizeof(mdev->bus_info));
 803         mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
 804         mdev->driver_version = LINUX_VERSION_CODE;
 805
 806         media_device_init(mdev);
 807 #endif
 808 }
 809 EXPORT_SYMBOL_GPL(__media_device_usb_init);
 810
 811
 812 #endif /* CONFIG_MEDIA_CONTROLLER */