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 /* We need to access legacy defines from linux/media.h */
  24 #define __NEED_MEDIA_LEGACY_API
  25
  26 #include <linux/compat.h>
  27 #include <linux/export.h>
  28 #include <linux/idr.h>
  29 #include <linux/ioctl.h>
  30 #include <linux/media.h>
  31 #include <linux/slab.h>
  32 #include <linux/types.h>
  33 #include <linux/pci.h>
  34 #include <linux/usb.h>
  35
  36 #include <media/media-device.h>
  37 #include <media/media-devnode.h>
  38 #include <media/media-entity.h>
  39
  40 #ifdef CONFIG_MEDIA_CONTROLLER
  41
  42 /* -----------------------------------------------------------------------------
  43  * Userspace API
  44  */
  45
  46 static inline void __user *media_get_uptr(__u64 arg)
  47 {
  48         return (void __user *)(uintptr_t)arg;
  49 }
  50
  51 static int media_device_open(struct file *filp)
  52 {
  53         return 0;
  54 }
  55
  56 static int media_device_close(struct file *filp)
  57 {
  58         return 0;
  59 }
  60
  61 static int media_device_get_info(struct media_device *dev,
  62                                  struct media_device_info __user *__info)
  63 {
  64         struct media_device_info info;
  65
  66         memset(&info, 0, sizeof(info));
  67
  68         if (dev->driver_name[0])
  69                 strlcpy(info.driver, dev->driver_name, sizeof(info.driver));
  70         else
  71                 strlcpy(info.driver, dev->dev->driver->name, sizeof(info.driver));
  72
  73         strlcpy(info.model, dev->model, sizeof(info.model));
  74         strlcpy(info.serial, dev->serial, sizeof(info.serial));
  75         strlcpy(info.bus_info, dev->bus_info, sizeof(info.bus_info));
  76
  77         info.media_version = MEDIA_API_VERSION;
  78         info.hw_revision = dev->hw_revision;
  79         info.driver_version = dev->driver_version;
  80
  81         if (copy_to_user(__info, &info, sizeof(*__info)))
  82                 return -EFAULT;
  83         return 0;
  84 }
  85
  86 static struct media_entity *find_entity(struct media_device *mdev, u32 id)
  87 {
  88         struct media_entity *entity;
  89         int next = id & MEDIA_ENT_ID_FLAG_NEXT;
  90
  91         id &= ~MEDIA_ENT_ID_FLAG_NEXT;
  92
  93         media_device_for_each_entity(entity, mdev) {
  94                 if (((media_entity_id(entity) == id) && !next) ||
  95                     ((media_entity_id(entity) > id) && next)) {
  96                         return entity;
  97                 }
  98         }
  99
 100         return NULL;
 101 }
 102
 103 static long media_device_enum_entities(struct media_device *mdev,
 104                                        struct media_entity_desc __user *uent)
 105 {
 106         struct media_entity *ent;
 107         struct media_entity_desc u_ent;
 108
 109         memset(&u_ent, 0, sizeof(u_ent));
 110         if (copy_from_user(&u_ent.id, &uent->id, sizeof(u_ent.id)))
 111                 return -EFAULT;
 112
 113         ent = find_entity(mdev, u_ent.id);
 114
 115         if (ent == NULL)
 116                 return -EINVAL;
 117
 118         u_ent.id = media_entity_id(ent);
 119         if (ent->name)
 120                 strlcpy(u_ent.name, ent->name, sizeof(u_ent.name));
 121         u_ent.type = ent->function;
 122         u_ent.revision = 0;             /* Unused */
 123         u_ent.flags = ent->flags;
 124         u_ent.group_id = 0;             /* Unused */
 125         u_ent.pads = ent->num_pads;
 126         u_ent.links = ent->num_links - ent->num_backlinks;
 127
 128         /*
 129          * Workaround for a bug at media-ctl <= v1.10 that makes it to
 130          * do the wrong thing if the entity function doesn't belong to
 131          * either MEDIA_ENT_F_OLD_BASE or MEDIA_ENT_F_OLD_SUBDEV_BASE
 132          * Ranges.
 133          *
 134          * Non-subdevices are expected to be at the MEDIA_ENT_F_OLD_BASE,
 135          * or, otherwise, will be silently ignored by media-ctl when
 136          * printing the graphviz diagram. So, map them into the devnode
 137          * old range.
 138          */
 139         if (ent->function < MEDIA_ENT_F_OLD_BASE ||
 140             ent->function > MEDIA_ENT_T_DEVNODE_UNKNOWN) {
 141                 if (is_media_entity_v4l2_subdev(ent))
 142                         u_ent.type = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
 143                 else if (ent->function != MEDIA_ENT_F_IO_V4L)
 144                         u_ent.type = MEDIA_ENT_T_DEVNODE_UNKNOWN;
 145         }
 146
 147         memcpy(&u_ent.raw, &ent->info, sizeof(ent->info));
 148         if (copy_to_user(uent, &u_ent, sizeof(u_ent)))
 149                 return -EFAULT;
 150         return 0;
 151 }
 152
 153 static void media_device_kpad_to_upad(const struct media_pad *kpad,
 154                                       struct media_pad_desc *upad)
 155 {
 156         upad->entity = media_entity_id(kpad->entity);
 157         upad->index = kpad->index;
 158         upad->flags = kpad->flags;
 159 }
 160
 161 static long __media_device_enum_links(struct media_device *mdev,
 162                                       struct media_links_enum *links)
 163 {
 164         struct media_entity *entity;
 165
 166         entity = find_entity(mdev, links->entity);
 167         if (entity == NULL)
 168                 return -EINVAL;
 169
 170         if (links->pads) {
 171                 unsigned int p;
 172
 173                 for (p = 0; p < entity->num_pads; p++) {
 174                         struct media_pad_desc pad;
 175
 176                         memset(&pad, 0, sizeof(pad));
 177                         media_device_kpad_to_upad(&entity->pads[p], &pad);
 178                         if (copy_to_user(&links->pads[p], &pad, sizeof(pad)))
 179                                 return -EFAULT;
 180                 }
 181         }
 182
 183         if (links->links) {
 184                 struct media_link *link;
 185                 struct media_link_desc __user *ulink_desc = links->links;
 186
 187                 list_for_each_entry(link, &entity->links, list) {
 188                         struct media_link_desc klink_desc;
 189
 190                         /* Ignore backlinks. */
 191                         if (link->source->entity != entity)
 192                                 continue;
 193                         memset(&klink_desc, 0, sizeof(klink_desc));
 194                         media_device_kpad_to_upad(link->source,
 195                                                   &klink_desc.source);
 196                         media_device_kpad_to_upad(link->sink,
 197                                                   &klink_desc.sink);
 198                         klink_desc.flags = link->flags;
 199                         if (copy_to_user(ulink_desc, &klink_desc,
 200                                          sizeof(*ulink_desc)))
 201                                 return -EFAULT;
 202                         ulink_desc++;
 203                 }
 204         }
 205
 206         return 0;
 207 }
 208
 209 static long media_device_enum_links(struct media_device *mdev,
 210                                     struct media_links_enum __user *ulinks)
 211 {
 212         struct media_links_enum links;
 213         int rval;
 214
 215         if (copy_from_user(&links, ulinks, sizeof(links)))
 216                 return -EFAULT;
 217
 218         rval = __media_device_enum_links(mdev, &links);
 219         if (rval < 0)
 220                 return rval;
 221
 222         if (copy_to_user(ulinks, &links, sizeof(*ulinks)))
 223                 return -EFAULT;
 224
 225         return 0;
 226 }
 227
 228 static long media_device_setup_link(struct media_device *mdev,
 229                                     struct media_link_desc __user *_ulink)
 230 {
 231         struct media_link *link = NULL;
 232         struct media_link_desc ulink;
 233         struct media_entity *source;
 234         struct media_entity *sink;
 235         int ret;
 236
 237         if (copy_from_user(&ulink, _ulink, sizeof(ulink)))
 238                 return -EFAULT;
 239
 240         /* Find the source and sink entities and link.
 241          */
 242         source = find_entity(mdev, ulink.source.entity);
 243         sink = find_entity(mdev, ulink.sink.entity);
 244
 245         if (source == NULL || sink == NULL)
 246                 return -EINVAL;
 247
 248         if (ulink.source.index >= source->num_pads ||
 249             ulink.sink.index >= sink->num_pads)
 250                 return -EINVAL;
 251
 252         link = media_entity_find_link(&source->pads[ulink.source.index],
 253                                       &sink->pads[ulink.sink.index]);
 254         if (link == NULL)
 255                 return -EINVAL;
 256
 257         /* Setup the link on both entities. */
 258         ret = __media_entity_setup_link(link, ulink.flags);
 259
 260         if (copy_to_user(_ulink, &ulink, sizeof(ulink)))
 261                 return -EFAULT;
 262
 263         return ret;
 264 }
 265
 266 static long __media_device_get_topology(struct media_device *mdev,
 267                                       struct media_v2_topology *topo)
 268 {
 269         struct media_entity *entity;
 270         struct media_interface *intf;
 271         struct media_pad *pad;
 272         struct media_link *link;
 273         struct media_v2_entity kentity, __user *uentity;
 274         struct media_v2_interface kintf, __user *uintf;
 275         struct media_v2_pad kpad, __user *upad;
 276         struct media_v2_link klink, __user *ulink;
 277         unsigned int i;
 278         int ret = 0;
 279
 280         topo->topology_version = mdev->topology_version;
 281
 282         /* Get entities and number of entities */
 283         i = 0;
 284         uentity = media_get_uptr(topo->ptr_entities);
 285         media_device_for_each_entity(entity, mdev) {
 286                 i++;
 287                 if (ret || !uentity)
 288                         continue;
 289
 290                 if (i > topo->num_entities) {
 291                         ret = -ENOSPC;
 292                         continue;
 293                 }
 294
 295                 /* Copy fields to userspace struct if not error */
 296                 memset(&kentity, 0, sizeof(kentity));
 297                 kentity.id = entity->graph_obj.id;
 298                 kentity.function = entity->function;
 299                 strncpy(kentity.name, entity->name,
 300                         sizeof(kentity.name));
 301
 302                 if (copy_to_user(uentity, &kentity, sizeof(kentity)))
 303                         ret = -EFAULT;
 304                 uentity++;
 305         }
 306         topo->num_entities = i;
 307
 308         /* Get interfaces and number of interfaces */
 309         i = 0;
 310         uintf = media_get_uptr(topo->ptr_interfaces);
 311         media_device_for_each_intf(intf, mdev) {
 312                 i++;
 313                 if (ret || !uintf)
 314                         continue;
 315
 316                 if (i > topo->num_interfaces) {
 317                         ret = -ENOSPC;
 318                         continue;
 319                 }
 320
 321                 memset(&kintf, 0, sizeof(kintf));
 322
 323                 /* Copy intf fields to userspace struct */
 324                 kintf.id = intf->graph_obj.id;
 325                 kintf.intf_type = intf->type;
 326                 kintf.flags = intf->flags;
 327
 328                 if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {
 329                         struct media_intf_devnode *devnode;
 330
 331                         devnode = intf_to_devnode(intf);
 332
 333                         kintf.devnode.major = devnode->major;
 334                         kintf.devnode.minor = devnode->minor;
 335                 }
 336
 337                 if (copy_to_user(uintf, &kintf, sizeof(kintf)))
 338                         ret = -EFAULT;
 339                 uintf++;
 340         }
 341         topo->num_interfaces = i;
 342
 343         /* Get pads and number of pads */
 344         i = 0;
 345         upad = media_get_uptr(topo->ptr_pads);
 346         media_device_for_each_pad(pad, mdev) {
 347                 i++;
 348                 if (ret || !upad)
 349                         continue;
 350
 351                 if (i > topo->num_pads) {
 352                         ret = -ENOSPC;
 353                         continue;
 354                 }
 355
 356                 memset(&kpad, 0, sizeof(kpad));
 357
 358                 /* Copy pad fields to userspace struct */
 359                 kpad.id = pad->graph_obj.id;
 360                 kpad.entity_id = pad->entity->graph_obj.id;
 361                 kpad.flags = pad->flags;
 362
 363                 if (copy_to_user(upad, &kpad, sizeof(kpad)))
 364                         ret = -EFAULT;
 365                 upad++;
 366         }
 367         topo->num_pads = i;
 368
 369         /* Get links and number of links */
 370         i = 0;
 371         ulink = media_get_uptr(topo->ptr_links);
 372         media_device_for_each_link(link, mdev) {
 373                 if (link->is_backlink)
 374                         continue;
 375
 376                 i++;
 377
 378                 if (ret || !ulink)
 379                         continue;
 380
 381                 if (i > topo->num_links) {
 382                         ret = -ENOSPC;
 383                         continue;
 384                 }
 385
 386                 memset(&klink, 0, sizeof(klink));
 387
 388                 /* Copy link fields to userspace struct */
 389                 klink.id = link->graph_obj.id;
 390                 klink.source_id = link->gobj0->id;
 391                 klink.sink_id = link->gobj1->id;
 392                 klink.flags = link->flags;
 393
 394                 if (copy_to_user(ulink, &klink, sizeof(klink)))
 395                         ret = -EFAULT;
 396                 ulink++;
 397         }
 398         topo->num_links = i;
 399
 400         return ret;
 401 }
 402
 403 static long media_device_get_topology(struct media_device *mdev,
 404                                       struct media_v2_topology __user *utopo)
 405 {
 406         struct media_v2_topology ktopo;
 407         int ret;
 408
 409         if (copy_from_user(&ktopo, utopo, sizeof(ktopo)))
 410                 return -EFAULT;
 411
 412         ret = __media_device_get_topology(mdev, &ktopo);
 413         if (ret < 0)
 414                 return ret;
 415
 416         if (copy_to_user(utopo, &ktopo, sizeof(*utopo)))
 417                 return -EFAULT;
 418
 419         return 0;
 420 }
 421
 422 static long media_device_ioctl(struct file *filp, unsigned int cmd,
 423                                unsigned long arg)
 424 {
 425         struct media_devnode *devnode = media_devnode_data(filp);
 426         struct media_device *dev = devnode->media_dev;
 427         long ret;
 428
 429         mutex_lock(&dev->graph_mutex);
 430         switch (cmd) {
 431         case MEDIA_IOC_DEVICE_INFO:
 432                 ret = media_device_get_info(dev,
 433                                 (struct media_device_info __user *)arg);
 434                 break;
 435
 436         case MEDIA_IOC_ENUM_ENTITIES:
 437                 ret = media_device_enum_entities(dev,
 438                                 (struct media_entity_desc __user *)arg);
 439                 break;
 440
 441         case MEDIA_IOC_ENUM_LINKS:
 442                 ret = media_device_enum_links(dev,
 443                                 (struct media_links_enum __user *)arg);
 444                 break;
 445
 446         case MEDIA_IOC_SETUP_LINK:
 447                 ret = media_device_setup_link(dev,
 448                                 (struct media_link_desc __user *)arg);
 449                 break;
 450
 451         case MEDIA_IOC_G_TOPOLOGY:
 452                 ret = media_device_get_topology(dev,
 453                                 (struct media_v2_topology __user *)arg);
 454                 break;
 455
 456         default:
 457                 ret = -ENOIOCTLCMD;
 458         }
 459         mutex_unlock(&dev->graph_mutex);
 460
 461         return ret;
 462 }
 463
 464 #ifdef CONFIG_COMPAT
 465
 466 struct media_links_enum32 {
 467         __u32 entity;
 468         compat_uptr_t pads; /* struct media_pad_desc * */
 469         compat_uptr_t links; /* struct media_link_desc * */
 470         __u32 reserved[4];
 471 };
 472
 473 static long media_device_enum_links32(struct media_device *mdev,
 474                                       struct media_links_enum32 __user *ulinks)
 475 {
 476         struct media_links_enum links;
 477         compat_uptr_t pads_ptr, links_ptr;
 478
 479         memset(&links, 0, sizeof(links));
 480
 481         if (get_user(links.entity, &ulinks->entity)
 482             || get_user(pads_ptr, &ulinks->pads)
 483             || get_user(links_ptr, &ulinks->links))
 484                 return -EFAULT;
 485
 486         links.pads = compat_ptr(pads_ptr);
 487         links.links = compat_ptr(links_ptr);
 488
 489         return __media_device_enum_links(mdev, &links);
 490 }
 491
 492 #define MEDIA_IOC_ENUM_LINKS32          _IOWR('|', 0x02, struct media_links_enum32)
 493
 494 static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
 495                                       unsigned long arg)
 496 {
 497         struct media_devnode *devnode = media_devnode_data(filp);
 498         struct media_device *dev = devnode->media_dev;
 499         long ret;
 500
 501         switch (cmd) {
 502         case MEDIA_IOC_ENUM_LINKS32:
 503                 mutex_lock(&dev->graph_mutex);
 504                 ret = media_device_enum_links32(dev,
 505                                 (struct media_links_enum32 __user *)arg);
 506                 mutex_unlock(&dev->graph_mutex);
 507                 break;
 508
 509         default:
 510                 return media_device_ioctl(filp, cmd, arg);
 511         }
 512
 513         return ret;
 514 }
 515 #endif /* CONFIG_COMPAT */
 516
 517 static const struct media_file_operations media_device_fops = {
 518         .owner = THIS_MODULE,
 519         .open = media_device_open,
 520         .ioctl = media_device_ioctl,
 521 #ifdef CONFIG_COMPAT
 522         .compat_ioctl = media_device_compat_ioctl,
 523 #endif /* CONFIG_COMPAT */
 524         .release = media_device_close,
 525 };
 526
 527 /* -----------------------------------------------------------------------------
 528  * sysfs
 529  */
 530
 531 static ssize_t show_model(struct device *cd,
 532                           struct device_attribute *attr, char *buf)
 533 {
 534         struct media_devnode *devnode = to_media_devnode(cd);
 535         struct media_device *mdev = devnode->media_dev;
 536
 537         return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
 538 }
 539
 540 static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
 541
 542 /* -----------------------------------------------------------------------------
 543  * Registration/unregistration
 544  */
 545
 546 static void media_device_release(struct media_devnode *mdev)
 547 {
 548         dev_dbg(mdev->parent, "Media device released\n");
 549 }
 550
 551 /**
 552  * media_device_register_entity - Register an entity with a media device
 553  * @mdev:       The media device
 554  * @entity:     The entity
 555  */
 556 int __must_check media_device_register_entity(struct media_device *mdev,
 557                                               struct media_entity *entity)
 558 {
 559         struct media_entity_notify *notify, *next;
 560         unsigned int i;
 561         int ret;
 562
 563         if (entity->function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN ||
 564             entity->function == MEDIA_ENT_F_UNKNOWN)
 565                 dev_warn(mdev->dev,
 566                          "Entity type for entity %s was not initialized!\n",
 567                          entity->name);
 568
 569         /* Warn if we apparently re-register an entity */
 570         WARN_ON(entity->graph_obj.mdev != NULL);
 571         entity->graph_obj.mdev = mdev;
 572         INIT_LIST_HEAD(&entity->links);
 573         entity->num_links = 0;
 574         entity->num_backlinks = 0;
 575
 576         if (!ida_pre_get(&mdev->entity_internal_idx, GFP_KERNEL))
 577                 return -ENOMEM;
 578
 579         mutex_lock(&mdev->graph_mutex);
 580
 581         ret = ida_get_new_above(&mdev->entity_internal_idx, 1,
 582                                 &entity->internal_idx);
 583         if (ret < 0) {
 584                 mutex_unlock(&mdev->graph_mutex);
 585                 return ret;
 586         }
 587
 588         mdev->entity_internal_idx_max =
 589                 max(mdev->entity_internal_idx_max, entity->internal_idx);
 590
 591         /* Initialize media_gobj embedded at the entity */
 592         media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
 593
 594         /* Initialize objects at the pads */
 595         for (i = 0; i < entity->num_pads; i++)
 596                 media_gobj_create(mdev, MEDIA_GRAPH_PAD,
 597                                &entity->pads[i].graph_obj);
 598
 599         /* invoke entity_notify callbacks */
 600         list_for_each_entry_safe(notify, next, &mdev->entity_notify, list) {
 601                 (notify)->notify(entity, notify->notify_data);
 602         }
 603
 604         if (mdev->entity_internal_idx_max
 605             >= mdev->pm_count_walk.ent_enum.idx_max) {
 606                 struct media_entity_graph new = { .top = 0 };
 607
 608                 /*
 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.
 612                  */
 613                 ret = media_entity_graph_walk_init(&new, mdev);
 614                 if (ret) {
 615                         mutex_unlock(&mdev->graph_mutex);
 616                         return ret;
 617                 }
 618                 media_entity_graph_walk_cleanup(&mdev->pm_count_walk);
 619                 mdev->pm_count_walk = new;
 620         }
 621         mutex_unlock(&mdev->graph_mutex);
 622
 623         return 0;
 624 }
 625 EXPORT_SYMBOL_GPL(media_device_register_entity);
 626
 627 static void __media_device_unregister_entity(struct media_entity *entity)
 628 {
 629         struct media_device *mdev = entity->graph_obj.mdev;
 630         struct media_link *link, *tmp;
 631         struct media_interface *intf;
 632         unsigned int i;
 633
 634         ida_simple_remove(&mdev->entity_internal_idx, entity->internal_idx);
 635
 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);
 641                 }
 642         }
 643
 644         /* Remove all data links that belong to this entity */
 645         __media_entity_remove_links(entity);
 646
 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);
 650
 651         /* Remove the entity */
 652         media_gobj_destroy(&entity->graph_obj);
 653
 654         /* invoke entity_notify callbacks to handle entity removal?? */
 655
 656         entity->graph_obj.mdev = NULL;
 657 }
 658
 659 void media_device_unregister_entity(struct media_entity *entity)
 660 {
 661         struct media_device *mdev = entity->graph_obj.mdev;
 662
 663         if (mdev == NULL)
 664                 return;
 665
 666         mutex_lock(&mdev->graph_mutex);
 667         __media_device_unregister_entity(entity);
 668         mutex_unlock(&mdev->graph_mutex);
 669 }
 670 EXPORT_SYMBOL_GPL(media_device_unregister_entity);
 671
 672 /**
 673  * media_device_init() - initialize a media device
 674  * @mdev:       The media device
 675  *
 676  * The caller is responsible for initializing the media device before
 677  * registration. The following fields must be set:
 678  *
 679  * - dev must point to the parent device
 680  * - model must be filled with the device model name
 681  */
 682 void 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         mutex_init(&mdev->graph_mutex);
 690         ida_init(&mdev->entity_internal_idx);
 691
 692         dev_dbg(mdev->dev, "Media device initialized\n");
 693 }
 694 EXPORT_SYMBOL_GPL(media_device_init);
 695
 696 void media_device_cleanup(struct media_device *mdev)
 697 {
 698         ida_destroy(&mdev->entity_internal_idx);
 699         mdev->entity_internal_idx_max = 0;
 700         media_entity_graph_walk_cleanup(&mdev->pm_count_walk);
 701         mutex_destroy(&mdev->graph_mutex);
 702 }
 703 EXPORT_SYMBOL_GPL(media_device_cleanup);
 704
 705 int __must_check __media_device_register(struct media_device *mdev,
 706                                          struct module *owner)
 707 {
 708         struct media_devnode *devnode;
 709         int ret;
 710
 711         devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
 712         if (!devnode)
 713                 return -ENOMEM;
 714
 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;
 720
 721         /* Set version 0 to indicate user-space that the graph is static */
 722         mdev->topology_version = 0;
 723
 724         ret = media_devnode_register(mdev, devnode, owner);
 725         if (ret < 0) {
 726                 /* devnode free is handled in media_devnode_*() */
 727                 mdev->devnode = NULL;
 728                 return ret;
 729         }
 730
 731         ret = device_create_file(&devnode->dev, &dev_attr_model);
 732         if (ret < 0) {
 733                 /* devnode free is handled in media_devnode_*() */
 734                 mdev->devnode = NULL;
 735                 media_devnode_unregister_prepare(devnode);
 736                 media_devnode_unregister(devnode);
 737                 return ret;
 738         }
 739
 740         dev_dbg(mdev->dev, "Media device registered\n");
 741
 742         return 0;
 743 }
 744 EXPORT_SYMBOL_GPL(__media_device_register);
 745
 746 int __must_check media_device_register_entity_notify(struct media_device *mdev,
 747                                         struct media_entity_notify *nptr)
 748 {
 749         mutex_lock(&mdev->graph_mutex);
 750         list_add_tail(&nptr->list, &mdev->entity_notify);
 751         mutex_unlock(&mdev->graph_mutex);
 752         return 0;
 753 }
 754 EXPORT_SYMBOL_GPL(media_device_register_entity_notify);
 755
 756 /*
 757  * Note: Should be called with mdev->lock held.
 758  */
 759 static void __media_device_unregister_entity_notify(struct media_device *mdev,
 760                                         struct media_entity_notify *nptr)
 761 {
 762         list_del(&nptr->list);
 763 }
 764
 765 void media_device_unregister_entity_notify(struct media_device *mdev,
 766                                         struct media_entity_notify *nptr)
 767 {
 768         mutex_lock(&mdev->graph_mutex);
 769         __media_device_unregister_entity_notify(mdev, nptr);
 770         mutex_unlock(&mdev->graph_mutex);
 771 }
 772 EXPORT_SYMBOL_GPL(media_device_unregister_entity_notify);
 773
 774 void media_device_unregister(struct media_device *mdev)
 775 {
 776         struct media_entity *entity;
 777         struct media_entity *next;
 778         struct media_interface *intf, *tmp_intf;
 779         struct media_entity_notify *notify, *nextp;
 780
 781         if (mdev == NULL)
 782                 return;
 783
 784         mutex_lock(&mdev->graph_mutex);
 785
 786         /* Check if mdev was ever registered at all */
 787         if (!media_devnode_is_registered(mdev->devnode)) {
 788                 mutex_unlock(&mdev->graph_mutex);
 789                 return;
 790         }
 791
 792         /* Clear the devnode register bit to avoid races with media dev open */
 793         media_devnode_unregister_prepare(mdev->devnode);
 794
 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);
 798
 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);
 802
 803         /* Remove all interfaces from the media device */
 804         list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,
 805                                  graph_obj.list) {
 806                 __media_remove_intf_links(intf);
 807                 media_gobj_destroy(&intf->graph_obj);
 808                 kfree(intf);
 809         }
 810
 811         mutex_unlock(&mdev->graph_mutex);
 812
 813         dev_dbg(mdev->dev, "Media device unregistered\n");
 814
 815         device_remove_file(&mdev->devnode->dev, &dev_attr_model);
 816         media_devnode_unregister(mdev->devnode);
 817         /* devnode free is handled in media_devnode_*() */
 818         mdev->devnode = NULL;
 819 }
 820 EXPORT_SYMBOL_GPL(media_device_unregister);
 821
 822 static void media_device_release_devres(struct device *dev, void *res)
 823 {
 824 }
 825
 826 struct media_device *media_device_get_devres(struct device *dev)
 827 {
 828         struct media_device *mdev;
 829
 830         mdev = devres_find(dev, media_device_release_devres, NULL, NULL);
 831         if (mdev)
 832                 return mdev;
 833
 834         mdev = devres_alloc(media_device_release_devres,
 835                                 sizeof(struct media_device), GFP_KERNEL);
 836         if (!mdev)
 837                 return NULL;
 838         return devres_get(dev, mdev, NULL, NULL);
 839 }
 840 EXPORT_SYMBOL_GPL(media_device_get_devres);
 841
 842 struct media_device *media_device_find_devres(struct device *dev)
 843 {
 844         return devres_find(dev, media_device_release_devres, NULL, NULL);
 845 }
 846 EXPORT_SYMBOL_GPL(media_device_find_devres);
 847
 848 #if IS_ENABLED(CONFIG_PCI)
 849 void media_device_pci_init(struct media_device *mdev,
 850                            struct pci_dev *pci_dev,
 851                            const char *name)
 852 {
 853         mdev->dev = &pci_dev->dev;
 854
 855         if (name)
 856                 strlcpy(mdev->model, name, sizeof(mdev->model));
 857         else
 858                 strlcpy(mdev->model, pci_name(pci_dev), sizeof(mdev->model));
 859
 860         sprintf(mdev->bus_info, "PCI:%s", pci_name(pci_dev));
 861
 862         mdev->hw_revision = (pci_dev->subsystem_vendor << 16)
 863                             | pci_dev->subsystem_device;
 864
 865         mdev->driver_version = LINUX_VERSION_CODE;
 866
 867         media_device_init(mdev);
 868 }
 869 EXPORT_SYMBOL_GPL(media_device_pci_init);
 870 #endif
 871
 872 #if IS_ENABLED(CONFIG_USB)
 873 void __media_device_usb_init(struct media_device *mdev,
 874                              struct usb_device *udev,
 875                              const char *board_name,
 876                              const char *driver_name)
 877 {
 878         mdev->dev = &udev->dev;
 879
 880         if (driver_name)
 881                 strlcpy(mdev->driver_name, driver_name,
 882                         sizeof(mdev->driver_name));
 883
 884         if (board_name)
 885                 strlcpy(mdev->model, board_name, sizeof(mdev->model));
 886         else if (udev->product)
 887                 strlcpy(mdev->model, udev->product, sizeof(mdev->model));
 888         else
 889                 strlcpy(mdev->model, "unknown model", sizeof(mdev->model));
 890         if (udev->serial)
 891                 strlcpy(mdev->serial, udev->serial, sizeof(mdev->serial));
 892         usb_make_path(udev, mdev->bus_info, sizeof(mdev->bus_info));
 893         mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
 894         mdev->driver_version = LINUX_VERSION_CODE;
 895
 896         media_device_init(mdev);
 897 }
 898 EXPORT_SYMBOL_GPL(__media_device_usb_init);
 899 #endif
 900
 901
 902 #endif /* CONFIG_MEDIA_CONTROLLER */