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 *info)
  63 {
  64         memset(info, 0, sizeof(*info));
  65
  66         if (dev->driver_name[0])
  67                 strlcpy(info->driver, dev->driver_name, sizeof(info->driver));
  68         else
  69                 strlcpy(info->driver, dev->dev->driver->name,
  70                         sizeof(info->driver));
  71
  72         strlcpy(info->model, dev->model, sizeof(info->model));
  73         strlcpy(info->serial, dev->serial, sizeof(info->serial));
  74         strlcpy(info->bus_info, dev->bus_info, sizeof(info->bus_info));
  75
  76         info->media_version = MEDIA_API_VERSION;
  77         info->hw_revision = dev->hw_revision;
  78         info->driver_version = dev->driver_version;
  79
  80         return 0;
  81 }
  82
  83 static struct media_entity *find_entity(struct media_device *mdev, u32 id)
  84 {
  85         struct media_entity *entity;
  86         int next = id & MEDIA_ENT_ID_FLAG_NEXT;
  87
  88         id &= ~MEDIA_ENT_ID_FLAG_NEXT;
  89
  90         media_device_for_each_entity(entity, mdev) {
  91                 if (((media_entity_id(entity) == id) && !next) ||
  92                     ((media_entity_id(entity) > id) && next)) {
  93                         return entity;
  94                 }
  95         }
  96
  97         return NULL;
  98 }
  99
 100 static long media_device_enum_entities(struct media_device *mdev,
 101                                        struct media_entity_desc *entd)
 102 {
 103         struct media_entity *ent;
 104
 105         ent = find_entity(mdev, entd->id);
 106         if (ent == NULL)
 107                 return -EINVAL;
 108
 109         memset(entd, 0, sizeof(*entd));
 110
 111         entd->id = media_entity_id(ent);
 112         if (ent->name)
 113                 strlcpy(entd->name, ent->name, sizeof(entd->name));
 114         entd->type = ent->function;
 115         entd->revision = 0;             /* Unused */
 116         entd->flags = ent->flags;
 117         entd->group_id = 0;             /* Unused */
 118         entd->pads = ent->num_pads;
 119         entd->links = ent->num_links - ent->num_backlinks;
 120
 121         /*
 122          * Workaround for a bug at media-ctl <= v1.10 that makes it to
 123          * do the wrong thing if the entity function doesn't belong to
 124          * either MEDIA_ENT_F_OLD_BASE or MEDIA_ENT_F_OLD_SUBDEV_BASE
 125          * Ranges.
 126          *
 127          * Non-subdevices are expected to be at the MEDIA_ENT_F_OLD_BASE,
 128          * or, otherwise, will be silently ignored by media-ctl when
 129          * printing the graphviz diagram. So, map them into the devnode
 130          * old range.
 131          */
 132         if (ent->function < MEDIA_ENT_F_OLD_BASE ||
 133             ent->function > MEDIA_ENT_T_DEVNODE_UNKNOWN) {
 134                 if (is_media_entity_v4l2_subdev(ent))
 135                         entd->type = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
 136                 else if (ent->function != MEDIA_ENT_F_IO_V4L)
 137                         entd->type = MEDIA_ENT_T_DEVNODE_UNKNOWN;
 138         }
 139
 140         memcpy(&entd->raw, &ent->info, sizeof(ent->info));
 141
 142         return 0;
 143 }
 144
 145 static void media_device_kpad_to_upad(const struct media_pad *kpad,
 146                                       struct media_pad_desc *upad)
 147 {
 148         upad->entity = media_entity_id(kpad->entity);
 149         upad->index = kpad->index;
 150         upad->flags = kpad->flags;
 151 }
 152
 153 static long media_device_enum_links(struct media_device *mdev,
 154                                     struct media_links_enum *links)
 155 {
 156         struct media_entity *entity;
 157
 158         entity = find_entity(mdev, links->entity);
 159         if (entity == NULL)
 160                 return -EINVAL;
 161
 162         if (links->pads) {
 163                 unsigned int p;
 164
 165                 for (p = 0; p < entity->num_pads; p++) {
 166                         struct media_pad_desc pad;
 167
 168                         memset(&pad, 0, sizeof(pad));
 169                         media_device_kpad_to_upad(&entity->pads[p], &pad);
 170                         if (copy_to_user(&links->pads[p], &pad, sizeof(pad)))
 171                                 return -EFAULT;
 172                 }
 173         }
 174
 175         if (links->links) {
 176                 struct media_link *link;
 177                 struct media_link_desc __user *ulink_desc = links->links;
 178
 179                 list_for_each_entry(link, &entity->links, list) {
 180                         struct media_link_desc klink_desc;
 181
 182                         /* Ignore backlinks. */
 183                         if (link->source->entity != entity)
 184                                 continue;
 185                         memset(&klink_desc, 0, sizeof(klink_desc));
 186                         media_device_kpad_to_upad(link->source,
 187                                                   &klink_desc.source);
 188                         media_device_kpad_to_upad(link->sink,
 189                                                   &klink_desc.sink);
 190                         klink_desc.flags = link->flags;
 191                         if (copy_to_user(ulink_desc, &klink_desc,
 192                                          sizeof(*ulink_desc)))
 193                                 return -EFAULT;
 194                         ulink_desc++;
 195                 }
 196         }
 197
 198         return 0;
 199 }
 200
 201 static long media_device_setup_link(struct media_device *mdev,
 202                                     struct media_link_desc *linkd)
 203 {
 204         struct media_link *link = NULL;
 205         struct media_entity *source;
 206         struct media_entity *sink;
 207
 208         /* Find the source and sink entities and link.
 209          */
 210         source = find_entity(mdev, linkd->source.entity);
 211         sink = find_entity(mdev, linkd->sink.entity);
 212
 213         if (source == NULL || sink == NULL)
 214                 return -EINVAL;
 215
 216         if (linkd->source.index >= source->num_pads ||
 217             linkd->sink.index >= sink->num_pads)
 218                 return -EINVAL;
 219
 220         link = media_entity_find_link(&source->pads[linkd->source.index],
 221                                       &sink->pads[linkd->sink.index]);
 222         if (link == NULL)
 223                 return -EINVAL;
 224
 225         /* Setup the link on both entities. */
 226         return __media_entity_setup_link(link, linkd->flags);
 227 }
 228
 229 static long media_device_get_topology(struct media_device *mdev,
 230                                       struct media_v2_topology *topo)
 231 {
 232         struct media_entity *entity;
 233         struct media_interface *intf;
 234         struct media_pad *pad;
 235         struct media_link *link;
 236         struct media_v2_entity kentity, __user *uentity;
 237         struct media_v2_interface kintf, __user *uintf;
 238         struct media_v2_pad kpad, __user *upad;
 239         struct media_v2_link klink, __user *ulink;
 240         unsigned int i;
 241         int ret = 0;
 242
 243         topo->topology_version = mdev->topology_version;
 244
 245         /* Get entities and number of entities */
 246         i = 0;
 247         uentity = media_get_uptr(topo->ptr_entities);
 248         media_device_for_each_entity(entity, mdev) {
 249                 i++;
 250                 if (ret || !uentity)
 251                         continue;
 252
 253                 if (i > topo->num_entities) {
 254                         ret = -ENOSPC;
 255                         continue;
 256                 }
 257
 258                 /* Copy fields to userspace struct if not error */
 259                 memset(&kentity, 0, sizeof(kentity));
 260                 kentity.id = entity->graph_obj.id;
 261                 kentity.function = entity->function;
 262                 strncpy(kentity.name, entity->name,
 263                         sizeof(kentity.name));
 264
 265                 if (copy_to_user(uentity, &kentity, sizeof(kentity)))
 266                         ret = -EFAULT;
 267                 uentity++;
 268         }
 269         topo->num_entities = i;
 270
 271         /* Get interfaces and number of interfaces */
 272         i = 0;
 273         uintf = media_get_uptr(topo->ptr_interfaces);
 274         media_device_for_each_intf(intf, mdev) {
 275                 i++;
 276                 if (ret || !uintf)
 277                         continue;
 278
 279                 if (i > topo->num_interfaces) {
 280                         ret = -ENOSPC;
 281                         continue;
 282                 }
 283
 284                 memset(&kintf, 0, sizeof(kintf));
 285
 286                 /* Copy intf fields to userspace struct */
 287                 kintf.id = intf->graph_obj.id;
 288                 kintf.intf_type = intf->type;
 289                 kintf.flags = intf->flags;
 290
 291                 if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) {
 292                         struct media_intf_devnode *devnode;
 293
 294                         devnode = intf_to_devnode(intf);
 295
 296                         kintf.devnode.major = devnode->major;
 297                         kintf.devnode.minor = devnode->minor;
 298                 }
 299
 300                 if (copy_to_user(uintf, &kintf, sizeof(kintf)))
 301                         ret = -EFAULT;
 302                 uintf++;
 303         }
 304         topo->num_interfaces = i;
 305
 306         /* Get pads and number of pads */
 307         i = 0;
 308         upad = media_get_uptr(topo->ptr_pads);
 309         media_device_for_each_pad(pad, mdev) {
 310                 i++;
 311                 if (ret || !upad)
 312                         continue;
 313
 314                 if (i > topo->num_pads) {
 315                         ret = -ENOSPC;
 316                         continue;
 317                 }
 318
 319                 memset(&kpad, 0, sizeof(kpad));
 320
 321                 /* Copy pad fields to userspace struct */
 322                 kpad.id = pad->graph_obj.id;
 323                 kpad.entity_id = pad->entity->graph_obj.id;
 324                 kpad.flags = pad->flags;
 325
 326                 if (copy_to_user(upad, &kpad, sizeof(kpad)))
 327                         ret = -EFAULT;
 328                 upad++;
 329         }
 330         topo->num_pads = i;
 331
 332         /* Get links and number of links */
 333         i = 0;
 334         ulink = media_get_uptr(topo->ptr_links);
 335         media_device_for_each_link(link, mdev) {
 336                 if (link->is_backlink)
 337                         continue;
 338
 339                 i++;
 340
 341                 if (ret || !ulink)
 342                         continue;
 343
 344                 if (i > topo->num_links) {
 345                         ret = -ENOSPC;
 346                         continue;
 347                 }
 348
 349                 memset(&klink, 0, sizeof(klink));
 350
 351                 /* Copy link fields to userspace struct */
 352                 klink.id = link->graph_obj.id;
 353                 klink.source_id = link->gobj0->id;
 354                 klink.sink_id = link->gobj1->id;
 355                 klink.flags = link->flags;
 356
 357                 if (copy_to_user(ulink, &klink, sizeof(klink)))
 358                         ret = -EFAULT;
 359                 ulink++;
 360         }
 361         topo->num_links = i;
 362
 363         return ret;
 364 }
 365
 366 static long copy_arg_from_user(void *karg, void __user *uarg, unsigned int cmd)
 367 {
 368         /* All media IOCTLs are _IOWR() */
 369         if (copy_from_user(karg, uarg, _IOC_SIZE(cmd)))
 370                 return -EFAULT;
 371
 372         return 0;
 373 }
 374
 375 static long copy_arg_to_user(void __user *uarg, void *karg, unsigned int cmd)
 376 {
 377         /* All media IOCTLs are _IOWR() */
 378         if (copy_to_user(uarg, karg, _IOC_SIZE(cmd)))
 379                 return -EFAULT;
 380
 381         return 0;
 382 }
 383
 384 /* Do acquire the graph mutex */
 385 #define MEDIA_IOC_FL_GRAPH_MUTEX        BIT(0)
 386
 387 #define MEDIA_IOC_ARG(__cmd, func, fl, from_user, to_user)              \
 388         [_IOC_NR(MEDIA_IOC_##__cmd)] = {                                \
 389                 .cmd = MEDIA_IOC_##__cmd,                               \
 390                 .fn = (long (*)(struct media_device *, void *))func,    \
 391                 .flags = fl,                                            \
 392                 .arg_from_user = from_user,                             \
 393                 .arg_to_user = to_user,                                 \
 394         }
 395
 396 #define MEDIA_IOC(__cmd, func, fl)                                      \
 397         MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user)
 398
 399 /* the table is indexed by _IOC_NR(cmd) */
 400 struct media_ioctl_info {
 401         unsigned int cmd;
 402         unsigned short flags;
 403         long (*fn)(struct media_device *dev, void *arg);
 404         long (*arg_from_user)(void *karg, void __user *uarg, unsigned int cmd);
 405         long (*arg_to_user)(void __user *uarg, void *karg, unsigned int cmd);
 406 };
 407
 408 static const struct media_ioctl_info ioctl_info[] = {
 409         MEDIA_IOC(DEVICE_INFO, media_device_get_info, MEDIA_IOC_FL_GRAPH_MUTEX),
 410         MEDIA_IOC(ENUM_ENTITIES, media_device_enum_entities, MEDIA_IOC_FL_GRAPH_MUTEX),
 411         MEDIA_IOC(ENUM_LINKS, media_device_enum_links, MEDIA_IOC_FL_GRAPH_MUTEX),
 412         MEDIA_IOC(SETUP_LINK, media_device_setup_link, MEDIA_IOC_FL_GRAPH_MUTEX),
 413         MEDIA_IOC(G_TOPOLOGY, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX),
 414 };
 415
 416 static long media_device_ioctl(struct file *filp, unsigned int cmd,
 417                                unsigned long __arg)
 418 {
 419         struct media_devnode *devnode = media_devnode_data(filp);
 420         struct media_device *dev = devnode->media_dev;
 421         const struct media_ioctl_info *info;
 422         void __user *arg = (void __user *)__arg;
 423         char __karg[256], *karg = __karg;
 424         long ret;
 425
 426         if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info)
 427             || ioctl_info[_IOC_NR(cmd)].cmd != cmd)
 428                 return -ENOIOCTLCMD;
 429
 430         info = &ioctl_info[_IOC_NR(cmd)];
 431
 432         if (_IOC_SIZE(info->cmd) > sizeof(__karg)) {
 433                 karg = kmalloc(_IOC_SIZE(info->cmd), GFP_KERNEL);
 434                 if (!karg)
 435                         return -ENOMEM;
 436         }
 437
 438         if (info->arg_from_user) {
 439                 ret = info->arg_from_user(karg, arg, cmd);
 440                 if (ret)
 441                         goto out_free;
 442         }
 443
 444         if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
 445                 mutex_lock(&dev->graph_mutex);
 446
 447         ret = info->fn(dev, karg);
 448
 449         if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX)
 450                 mutex_unlock(&dev->graph_mutex);
 451
 452         if (!ret && info->arg_to_user)
 453                 ret = info->arg_to_user(arg, karg, cmd);
 454
 455 out_free:
 456         if (karg != __karg)
 457                 kfree(karg);
 458
 459         return ret;
 460 }
 461
 462 #ifdef CONFIG_COMPAT
 463
 464 struct media_links_enum32 {
 465         __u32 entity;
 466         compat_uptr_t pads; /* struct media_pad_desc * */
 467         compat_uptr_t links; /* struct media_link_desc * */
 468         __u32 reserved[4];
 469 };
 470
 471 static long media_device_enum_links32(struct media_device *mdev,
 472                                       struct media_links_enum32 __user *ulinks)
 473 {
 474         struct media_links_enum links;
 475         compat_uptr_t pads_ptr, links_ptr;
 476
 477         memset(&links, 0, sizeof(links));
 478
 479         if (get_user(links.entity, &ulinks->entity)
 480             || get_user(pads_ptr, &ulinks->pads)
 481             || get_user(links_ptr, &ulinks->links))
 482                 return -EFAULT;
 483
 484         links.pads = compat_ptr(pads_ptr);
 485         links.links = compat_ptr(links_ptr);
 486
 487         return media_device_enum_links(mdev, &links);
 488 }
 489
 490 #define MEDIA_IOC_ENUM_LINKS32          _IOWR('|', 0x02, struct media_links_enum32)
 491
 492 static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
 493                                       unsigned long arg)
 494 {
 495         struct media_devnode *devnode = media_devnode_data(filp);
 496         struct media_device *dev = devnode->media_dev;
 497         long ret;
 498
 499         switch (cmd) {
 500         case MEDIA_IOC_ENUM_LINKS32:
 501                 mutex_lock(&dev->graph_mutex);
 502                 ret = media_device_enum_links32(dev,
 503                                 (struct media_links_enum32 __user *)arg);
 504                 mutex_unlock(&dev->graph_mutex);
 505                 break;
 506
 507         default:
 508                 return media_device_ioctl(filp, cmd, arg);
 509         }
 510
 511         return ret;
 512 }
 513 #endif /* CONFIG_COMPAT */
 514
 515 static const struct media_file_operations media_device_fops = {
 516         .owner = THIS_MODULE,
 517         .open = media_device_open,
 518         .ioctl = media_device_ioctl,
 519 #ifdef CONFIG_COMPAT
 520         .compat_ioctl = media_device_compat_ioctl,
 521 #endif /* CONFIG_COMPAT */
 522         .release = media_device_close,
 523 };
 524
 525 /* -----------------------------------------------------------------------------
 526  * sysfs
 527  */
 528
 529 static ssize_t show_model(struct device *cd,
 530                           struct device_attribute *attr, char *buf)
 531 {
 532         struct media_devnode *devnode = to_media_devnode(cd);
 533         struct media_device *mdev = devnode->media_dev;
 534
 535         return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
 536 }
 537
 538 static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
 539
 540 /* -----------------------------------------------------------------------------
 541  * Registration/unregistration
 542  */
 543
 544 static void media_device_release(struct media_devnode *mdev)
 545 {
 546         dev_dbg(mdev->parent, "Media device released\n");
 547 }
 548
 549 /**
 550  * media_device_register_entity - Register an entity with a media device
 551  * @mdev:       The media device
 552  * @entity:     The entity
 553  */
 554 int __must_check media_device_register_entity(struct media_device *mdev,
 555                                               struct media_entity *entity)
 556 {
 557         struct media_entity_notify *notify, *next;
 558         unsigned int i;
 559         int ret;
 560
 561         if (entity->function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN ||
 562             entity->function == MEDIA_ENT_F_UNKNOWN)
 563                 dev_warn(mdev->dev,
 564                          "Entity type for entity %s was not initialized!\n",
 565                          entity->name);
 566
 567         /* Warn if we apparently re-register an entity */
 568         WARN_ON(entity->graph_obj.mdev != NULL);
 569         entity->graph_obj.mdev = mdev;
 570         INIT_LIST_HEAD(&entity->links);
 571         entity->num_links = 0;
 572         entity->num_backlinks = 0;
 573
 574         if (!ida_pre_get(&mdev->entity_internal_idx, GFP_KERNEL))
 575                 return -ENOMEM;
 576
 577         mutex_lock(&mdev->graph_mutex);
 578
 579         ret = ida_get_new_above(&mdev->entity_internal_idx, 1,
 580                                 &entity->internal_idx);
 581         if (ret < 0) {
 582                 mutex_unlock(&mdev->graph_mutex);
 583                 return ret;
 584         }
 585
 586         mdev->entity_internal_idx_max =
 587                 max(mdev->entity_internal_idx_max, entity->internal_idx);
 588
 589         /* Initialize media_gobj embedded at the entity */
 590         media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj);
 591
 592         /* Initialize objects at the pads */
 593         for (i = 0; i < entity->num_pads; i++)
 594                 media_gobj_create(mdev, MEDIA_GRAPH_PAD,
 595                                &entity->pads[i].graph_obj);
 596
 597         /* invoke entity_notify callbacks */
 598         list_for_each_entry_safe(notify, next, &mdev->entity_notify, list) {
 599                 (notify)->notify(entity, notify->notify_data);
 600         }
 601
 602         if (mdev->entity_internal_idx_max
 603             >= mdev->pm_count_walk.ent_enum.idx_max) {
 604                 struct media_entity_graph new = { .top = 0 };
 605
 606                 /*
 607                  * Initialise the new graph walk before cleaning up
 608                  * the old one in order not to spoil the graph walk
 609                  * object of the media device if graph walk init fails.
 610                  */
 611                 ret = media_entity_graph_walk_init(&new, mdev);
 612                 if (ret) {
 613                         mutex_unlock(&mdev->graph_mutex);
 614                         return ret;
 615                 }
 616                 media_entity_graph_walk_cleanup(&mdev->pm_count_walk);
 617                 mdev->pm_count_walk = new;
 618         }
 619         mutex_unlock(&mdev->graph_mutex);
 620
 621         return 0;
 622 }
 623 EXPORT_SYMBOL_GPL(media_device_register_entity);
 624
 625 static void __media_device_unregister_entity(struct media_entity *entity)
 626 {
 627         struct media_device *mdev = entity->graph_obj.mdev;
 628         struct media_link *link, *tmp;
 629         struct media_interface *intf;
 630         unsigned int i;
 631
 632         ida_simple_remove(&mdev->entity_internal_idx, entity->internal_idx);
 633
 634         /* Remove all interface links pointing to this entity */
 635         list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) {
 636                 list_for_each_entry_safe(link, tmp, &intf->links, list) {
 637                         if (link->entity == entity)
 638                                 __media_remove_intf_link(link);
 639                 }
 640         }
 641
 642         /* Remove all data links that belong to this entity */
 643         __media_entity_remove_links(entity);
 644
 645         /* Remove all pads that belong to this entity */
 646         for (i = 0; i < entity->num_pads; i++)
 647                 media_gobj_destroy(&entity->pads[i].graph_obj);
 648
 649         /* Remove the entity */
 650         media_gobj_destroy(&entity->graph_obj);
 651
 652         /* invoke entity_notify callbacks to handle entity removal?? */
 653
 654         entity->graph_obj.mdev = NULL;
 655 }
 656
 657 void media_device_unregister_entity(struct media_entity *entity)
 658 {
 659         struct media_device *mdev = entity->graph_obj.mdev;
 660
 661         if (mdev == NULL)
 662                 return;
 663
 664         mutex_lock(&mdev->graph_mutex);
 665         __media_device_unregister_entity(entity);
 666         mutex_unlock(&mdev->graph_mutex);
 667 }
 668 EXPORT_SYMBOL_GPL(media_device_unregister_entity);
 669
 670 /**
 671  * media_device_init() - initialize a media device
 672  * @mdev:       The media device
 673  *
 674  * The caller is responsible for initializing the media device before
 675  * registration. The following fields must be set:
 676  *
 677  * - dev must point to the parent device
 678  * - model must be filled with the device model name
 679  */
 680 void media_device_init(struct media_device *mdev)
 681 {
 682         INIT_LIST_HEAD(&mdev->entities);
 683         INIT_LIST_HEAD(&mdev->interfaces);
 684         INIT_LIST_HEAD(&mdev->pads);
 685         INIT_LIST_HEAD(&mdev->links);
 686         INIT_LIST_HEAD(&mdev->entity_notify);
 687         mutex_init(&mdev->graph_mutex);
 688         ida_init(&mdev->entity_internal_idx);
 689
 690         dev_dbg(mdev->dev, "Media device initialized\n");
 691 }
 692 EXPORT_SYMBOL_GPL(media_device_init);
 693
 694 void media_device_cleanup(struct media_device *mdev)
 695 {
 696         ida_destroy(&mdev->entity_internal_idx);
 697         mdev->entity_internal_idx_max = 0;
 698         media_entity_graph_walk_cleanup(&mdev->pm_count_walk);
 699         mutex_destroy(&mdev->graph_mutex);
 700 }
 701 EXPORT_SYMBOL_GPL(media_device_cleanup);
 702
 703 int __must_check __media_device_register(struct media_device *mdev,
 704                                          struct module *owner)
 705 {
 706         struct media_devnode *devnode;
 707         int ret;
 708
 709         devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
 710         if (!devnode)
 711                 return -ENOMEM;
 712
 713         /* Register the device node. */
 714         mdev->devnode = devnode;
 715         devnode->fops = &media_device_fops;
 716         devnode->parent = mdev->dev;
 717         devnode->release = media_device_release;
 718
 719         /* Set version 0 to indicate user-space that the graph is static */
 720         mdev->topology_version = 0;
 721
 722         ret = media_devnode_register(mdev, devnode, owner);
 723         if (ret < 0) {
 724                 /* devnode free is handled in media_devnode_*() */
 725                 mdev->devnode = NULL;
 726                 return ret;
 727         }
 728
 729         ret = device_create_file(&devnode->dev, &dev_attr_model);
 730         if (ret < 0) {
 731                 /* devnode free is handled in media_devnode_*() */
 732                 mdev->devnode = NULL;
 733                 media_devnode_unregister_prepare(devnode);
 734                 media_devnode_unregister(devnode);
 735                 return ret;
 736         }
 737
 738         dev_dbg(mdev->dev, "Media device registered\n");
 739
 740         return 0;
 741 }
 742 EXPORT_SYMBOL_GPL(__media_device_register);
 743
 744 int __must_check media_device_register_entity_notify(struct media_device *mdev,
 745                                         struct media_entity_notify *nptr)
 746 {
 747         mutex_lock(&mdev->graph_mutex);
 748         list_add_tail(&nptr->list, &mdev->entity_notify);
 749         mutex_unlock(&mdev->graph_mutex);
 750         return 0;
 751 }
 752 EXPORT_SYMBOL_GPL(media_device_register_entity_notify);
 753
 754 /*
 755  * Note: Should be called with mdev->lock held.
 756  */
 757 static void __media_device_unregister_entity_notify(struct media_device *mdev,
 758                                         struct media_entity_notify *nptr)
 759 {
 760         list_del(&nptr->list);
 761 }
 762
 763 void media_device_unregister_entity_notify(struct media_device *mdev,
 764                                         struct media_entity_notify *nptr)
 765 {
 766         mutex_lock(&mdev->graph_mutex);
 767         __media_device_unregister_entity_notify(mdev, nptr);
 768         mutex_unlock(&mdev->graph_mutex);
 769 }
 770 EXPORT_SYMBOL_GPL(media_device_unregister_entity_notify);
 771
 772 void media_device_unregister(struct media_device *mdev)
 773 {
 774         struct media_entity *entity;
 775         struct media_entity *next;
 776         struct media_interface *intf, *tmp_intf;
 777         struct media_entity_notify *notify, *nextp;
 778
 779         if (mdev == NULL)
 780                 return;
 781
 782         mutex_lock(&mdev->graph_mutex);
 783
 784         /* Check if mdev was ever registered at all */
 785         if (!media_devnode_is_registered(mdev->devnode)) {
 786                 mutex_unlock(&mdev->graph_mutex);
 787                 return;
 788         }
 789
 790         /* Clear the devnode register bit to avoid races with media dev open */
 791         media_devnode_unregister_prepare(mdev->devnode);
 792
 793         /* Remove all entities from the media device */
 794         list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)
 795                 __media_device_unregister_entity(entity);
 796
 797         /* Remove all entity_notify callbacks from the media device */
 798         list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list)
 799                 __media_device_unregister_entity_notify(mdev, notify);
 800
 801         /* Remove all interfaces from the media device */
 802         list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,
 803                                  graph_obj.list) {
 804                 /*
 805                  * Unlink the interface, but don't free it here; the
 806                  * module which created it is responsible for freeing
 807                  * it
 808                  */
 809                 __media_remove_intf_links(intf);
 810                 media_gobj_destroy(&intf->graph_obj);
 811         }
 812
 813         mutex_unlock(&mdev->graph_mutex);
 814
 815         dev_dbg(mdev->dev, "Media device unregistered\n");
 816
 817         device_remove_file(&mdev->devnode->dev, &dev_attr_model);
 818         media_devnode_unregister(mdev->devnode);
 819         /* devnode free is handled in media_devnode_*() */
 820         mdev->devnode = NULL;
 821 }
 822 EXPORT_SYMBOL_GPL(media_device_unregister);
 823
 824 #if IS_ENABLED(CONFIG_PCI)
 825 void media_device_pci_init(struct media_device *mdev,
 826                            struct pci_dev *pci_dev,
 827                            const char *name)
 828 {
 829         mdev->dev = &pci_dev->dev;
 830
 831         if (name)
 832                 strlcpy(mdev->model, name, sizeof(mdev->model));
 833         else
 834                 strlcpy(mdev->model, pci_name(pci_dev), sizeof(mdev->model));
 835
 836         sprintf(mdev->bus_info, "PCI:%s", pci_name(pci_dev));
 837
 838         mdev->hw_revision = (pci_dev->subsystem_vendor << 16)
 839                             | pci_dev->subsystem_device;
 840
 841         mdev->driver_version = LINUX_VERSION_CODE;
 842
 843         media_device_init(mdev);
 844 }
 845 EXPORT_SYMBOL_GPL(media_device_pci_init);
 846 #endif
 847
 848 #if IS_ENABLED(CONFIG_USB)
 849 void __media_device_usb_init(struct media_device *mdev,
 850                              struct usb_device *udev,
 851                              const char *board_name,
 852                              const char *driver_name)
 853 {
 854         mdev->dev = &udev->dev;
 855
 856         if (driver_name)
 857                 strlcpy(mdev->driver_name, driver_name,
 858                         sizeof(mdev->driver_name));
 859
 860         if (board_name)
 861                 strlcpy(mdev->model, board_name, sizeof(mdev->model));
 862         else if (udev->product)
 863                 strlcpy(mdev->model, udev->product, sizeof(mdev->model));
 864         else
 865                 strlcpy(mdev->model, "unknown model", sizeof(mdev->model));
 866         if (udev->serial)
 867                 strlcpy(mdev->serial, udev->serial, sizeof(mdev->serial));
 868         usb_make_path(udev, mdev->bus_info, sizeof(mdev->bus_info));
 869         mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
 870         mdev->driver_version = LINUX_VERSION_CODE;
 871
 872         media_device_init(mdev);
 873 }
 874 EXPORT_SYMBOL_GPL(__media_device_usb_init);
 875 #endif
 876
 877
 878 #endif /* CONFIG_MEDIA_CONTROLLER */