1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Media device 4 * 5 * Copyright (C) 2010 Nokia Corporation 6 * 7 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com> 8 * Sakari Ailus <sakari.ailus@iki.fi> 9 */ 10 11#include <linux/compat.h> 12#include <linux/export.h> 13#include <linux/idr.h> 14#include <linux/ioctl.h> 15#include <linux/media.h> 16#include <linux/slab.h> 17#include <linux/types.h> 18#include <linux/pci.h> 19#include <linux/usb.h> 20#include <linux/version.h> 21 22#include <media/media-device.h> 23#include <media/media-devnode.h> 24#include <media/media-entity.h> 25#include <media/media-request.h> 26 27#ifdef CONFIG_MEDIA_CONTROLLER 28 29/* 30 * Legacy defines from linux/media.h. This is the only place we need this 31 * so we just define it here. The media.h header doesn't expose it to the 32 * kernel to prevent it from being used by drivers, but here (and only here!) 33 * we need it to handle the legacy behavior. 34 */ 35#define MEDIA_ENT_SUBTYPE_MASK 0x0000ffff 36#define MEDIA_ENT_T_DEVNODE_UNKNOWN (MEDIA_ENT_F_OLD_BASE | \ 37 MEDIA_ENT_SUBTYPE_MASK) 38 39/* ----------------------------------------------------------------------------- 40 * Userspace API 41 */ 42 43static inline void __user *media_get_uptr(__u64 arg) 44{ 45 return (void __user *)(uintptr_t)arg; 46} 47 48static int media_device_open(struct file *filp) 49{ 50 return 0; 51} 52 53static int media_device_close(struct file *filp) 54{ 55 return 0; 56} 57 58static long media_device_get_info(struct media_device *dev, void *arg) 59{ 60 struct media_device_info *info = arg; 61 62 memset(info, 0, sizeof(*info)); 63 64 if (dev->driver_name[0]) 65 strscpy(info->driver, dev->driver_name, sizeof(info->driver)); 66 else 67 strscpy(info->driver, dev->dev->driver->name, 68 sizeof(info->driver)); 69 70 strscpy(info->model, dev->model, sizeof(info->model)); 71 strscpy(info->serial, dev->serial, sizeof(info->serial)); 72 strscpy(info->bus_info, dev->bus_info, sizeof(info->bus_info)); 73 74 info->media_version = LINUX_VERSION_CODE; 75 info->driver_version = info->media_version; 76 info->hw_revision = dev->hw_revision; 77 78 return 0; 79} 80 81static struct media_entity *find_entity(struct media_device *mdev, u32 id) 82{ 83 struct media_entity *entity; 84 int next = id & MEDIA_ENT_ID_FLAG_NEXT; 85 86 id &= ~MEDIA_ENT_ID_FLAG_NEXT; 87 88 media_device_for_each_entity(entity, mdev) { 89 if (((media_entity_id(entity) == id) && !next) || 90 ((media_entity_id(entity) > id) && next)) { 91 return entity; 92 } 93 } 94 95 return NULL; 96} 97 98static long media_device_enum_entities(struct media_device *mdev, void *arg) 99{ 100 struct media_entity_desc *entd = arg; 101 struct media_entity *ent; 102 103 ent = find_entity(mdev, entd->id); 104 if (ent == NULL) 105 return -EINVAL; 106 107 memset(entd, 0, sizeof(*entd)); 108 109 entd->id = media_entity_id(ent); 110 if (ent->name) 111 strscpy(entd->name, ent->name, sizeof(entd->name)); 112 entd->type = ent->function; 113 entd->revision = 0; /* Unused */ 114 entd->flags = ent->flags; 115 entd->group_id = 0; /* Unused */ 116 entd->pads = ent->num_pads; 117 entd->links = ent->num_links - ent->num_backlinks; 118 119 /* 120 * Workaround for a bug at media-ctl <= v1.10 that makes it to 121 * do the wrong thing if the entity function doesn't belong to 122 * either MEDIA_ENT_F_OLD_BASE or MEDIA_ENT_F_OLD_SUBDEV_BASE 123 * Ranges. 124 * 125 * Non-subdevices are expected to be at the MEDIA_ENT_F_OLD_BASE, 126 * or, otherwise, will be silently ignored by media-ctl when 127 * printing the graphviz diagram. So, map them into the devnode 128 * old range. 129 */ 130 if (ent->function < MEDIA_ENT_F_OLD_BASE || 131 ent->function > MEDIA_ENT_F_TUNER) { 132 if (is_media_entity_v4l2_subdev(ent)) 133 entd->type = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN; 134 else if (ent->function != MEDIA_ENT_F_IO_V4L) 135 entd->type = MEDIA_ENT_T_DEVNODE_UNKNOWN; 136 } 137 138 memcpy(&entd->raw, &ent->info, sizeof(ent->info)); 139 140 return 0; 141} 142 143static void media_device_kpad_to_upad(const struct media_pad *kpad, 144 struct media_pad_desc *upad) 145{ 146 upad->entity = media_entity_id(kpad->entity); 147 upad->index = kpad->index; 148 upad->flags = kpad->flags; 149} 150 151static long media_device_enum_links(struct media_device *mdev, void *arg) 152{ 153 struct media_links_enum *links = arg; 154 struct media_entity *entity; 155 156 entity = find_entity(mdev, links->entity); 157 if (entity == NULL) 158 return -EINVAL; 159 160 if (links->pads) { 161 unsigned int p; 162 163 for (p = 0; p < entity->num_pads; p++) { 164 struct media_pad_desc pad; 165 166 memset(&pad, 0, sizeof(pad)); 167 media_device_kpad_to_upad(&entity->pads[p], &pad); 168 if (copy_to_user(&links->pads[p], &pad, sizeof(pad))) 169 return -EFAULT; 170 } 171 } 172 173 if (links->links) { 174 struct media_link *link; 175 struct media_link_desc __user *ulink_desc = links->links; 176 177 list_for_each_entry(link, &entity->links, list) { 178 struct media_link_desc klink_desc; 179 180 /* Ignore backlinks. */ 181 if (link->source->entity != entity) 182 continue; 183 memset(&klink_desc, 0, sizeof(klink_desc)); 184 media_device_kpad_to_upad(link->source, 185 &klink_desc.source); 186 media_device_kpad_to_upad(link->sink, 187 &klink_desc.sink); 188 klink_desc.flags = link->flags; 189 if (copy_to_user(ulink_desc, &klink_desc, 190 sizeof(*ulink_desc))) 191 return -EFAULT; 192 ulink_desc++; 193 } 194 } 195 memset(links->reserved, 0, sizeof(links->reserved)); 196 197 return 0; 198} 199 200static long media_device_setup_link(struct media_device *mdev, void *arg) 201{ 202 struct media_link_desc *linkd = arg; 203 struct media_link *link = NULL; 204 struct media_entity *source; 205 struct media_entity *sink; 206 207 /* Find the source and sink entities and link. 208 */ 209 source = find_entity(mdev, linkd->source.entity); 210 sink = find_entity(mdev, linkd->sink.entity); 211 212 if (source == NULL || sink == NULL) 213 return -EINVAL; 214 215 if (linkd->source.index >= source->num_pads || 216 linkd->sink.index >= sink->num_pads) 217 return -EINVAL; 218 219 link = media_entity_find_link(&source->pads[linkd->source.index], 220 &sink->pads[linkd->sink.index]); 221 if (link == NULL) 222 return -EINVAL; 223 224 memset(linkd->reserved, 0, sizeof(linkd->reserved)); 225 226 /* Setup the link on both entities. */ 227 return __media_entity_setup_link(link, linkd->flags); 228} 229 230static long media_device_get_topology(struct media_device *mdev, void *arg) 231{ 232 struct media_v2_topology *topo = arg; 233 struct media_entity *entity; 234 struct media_interface *intf; 235 struct media_pad *pad; 236 struct media_link *link; 237 struct media_v2_entity kentity, __user *uentity; 238 struct media_v2_interface kintf, __user *uintf; 239 struct media_v2_pad kpad, __user *upad; 240 struct media_v2_link klink, __user *ulink; 241 unsigned int i; 242 int ret = 0; 243 244 topo->topology_version = mdev->topology_version; 245 246 /* Get entities and number of entities */ 247 i = 0; 248 uentity = media_get_uptr(topo->ptr_entities); 249 media_device_for_each_entity(entity, mdev) { 250 i++; 251 if (ret || !uentity) 252 continue; 253 254 if (i > topo->num_entities) { 255 ret = -ENOSPC; 256 continue; 257 } 258 259 /* Copy fields to userspace struct if not error */ 260 memset(&kentity, 0, sizeof(kentity)); 261 kentity.id = entity->graph_obj.id; 262 kentity.function = entity->function; 263 kentity.flags = entity->flags; 264 strscpy(kentity.name, entity->name, 265 sizeof(kentity.name)); 266 267 if (copy_to_user(uentity, &kentity, sizeof(kentity))) 268 ret = -EFAULT; 269 uentity++; 270 } 271 topo->num_entities = i; 272 topo->reserved1 = 0; 273 274 /* Get interfaces and number of interfaces */ 275 i = 0; 276 uintf = media_get_uptr(topo->ptr_interfaces); 277 media_device_for_each_intf(intf, mdev) { 278 i++; 279 if (ret || !uintf) 280 continue; 281 282 if (i > topo->num_interfaces) { 283 ret = -ENOSPC; 284 continue; 285 } 286 287 memset(&kintf, 0, sizeof(kintf)); 288 289 /* Copy intf fields to userspace struct */ 290 kintf.id = intf->graph_obj.id; 291 kintf.intf_type = intf->type; 292 kintf.flags = intf->flags; 293 294 if (media_type(&intf->graph_obj) == MEDIA_GRAPH_INTF_DEVNODE) { 295 struct media_intf_devnode *devnode; 296 297 devnode = intf_to_devnode(intf); 298 299 kintf.devnode.major = devnode->major; 300 kintf.devnode.minor = devnode->minor; 301 } 302 303 if (copy_to_user(uintf, &kintf, sizeof(kintf))) 304 ret = -EFAULT; 305 uintf++; 306 } 307 topo->num_interfaces = i; 308 topo->reserved2 = 0; 309 310 /* Get pads and number of pads */ 311 i = 0; 312 upad = media_get_uptr(topo->ptr_pads); 313 media_device_for_each_pad(pad, mdev) { 314 i++; 315 if (ret || !upad) 316 continue; 317 318 if (i > topo->num_pads) { 319 ret = -ENOSPC; 320 continue; 321 } 322 323 memset(&kpad, 0, sizeof(kpad)); 324 325 /* Copy pad fields to userspace struct */ 326 kpad.id = pad->graph_obj.id; 327 kpad.entity_id = pad->entity->graph_obj.id; 328 kpad.flags = pad->flags; 329 kpad.index = pad->index; 330 331 if (copy_to_user(upad, &kpad, sizeof(kpad))) 332 ret = -EFAULT; 333 upad++; 334 } 335 topo->num_pads = i; 336 topo->reserved3 = 0; 337 338 /* Get links and number of links */ 339 i = 0; 340 ulink = media_get_uptr(topo->ptr_links); 341 media_device_for_each_link(link, mdev) { 342 if (link->is_backlink) 343 continue; 344 345 i++; 346 347 if (ret || !ulink) 348 continue; 349 350 if (i > topo->num_links) { 351 ret = -ENOSPC; 352 continue; 353 } 354 355 memset(&klink, 0, sizeof(klink)); 356 357 /* Copy link fields to userspace struct */ 358 klink.id = link->graph_obj.id; 359 klink.source_id = link->gobj0->id; 360 klink.sink_id = link->gobj1->id; 361 klink.flags = link->flags; 362 363 if (copy_to_user(ulink, &klink, sizeof(klink))) 364 ret = -EFAULT; 365 ulink++; 366 } 367 topo->num_links = i; 368 topo->reserved4 = 0; 369 370 return ret; 371} 372 373static long media_device_request_alloc(struct media_device *mdev, void *arg) 374{ 375 int *alloc_fd = arg; 376 377 if (!mdev->ops || !mdev->ops->req_validate || !mdev->ops->req_queue) 378 return -ENOTTY; 379 380 return media_request_alloc(mdev, alloc_fd); 381} 382 383static long copy_arg_from_user(void *karg, void __user *uarg, unsigned int cmd) 384{ 385 if ((_IOC_DIR(cmd) & _IOC_WRITE) && 386 copy_from_user(karg, uarg, _IOC_SIZE(cmd))) 387 return -EFAULT; 388 389 return 0; 390} 391 392static long copy_arg_to_user(void __user *uarg, void *karg, unsigned int cmd) 393{ 394 if ((_IOC_DIR(cmd) & _IOC_READ) && 395 copy_to_user(uarg, karg, _IOC_SIZE(cmd))) 396 return -EFAULT; 397 398 return 0; 399} 400 401/* Do acquire the graph mutex */ 402#define MEDIA_IOC_FL_GRAPH_MUTEX BIT(0) 403 404#define MEDIA_IOC_ARG(__cmd, func, fl, from_user, to_user) \ 405 [_IOC_NR(MEDIA_IOC_##__cmd)] = { \ 406 .cmd = MEDIA_IOC_##__cmd, \ 407 .fn = func, \ 408 .flags = fl, \ 409 .arg_from_user = from_user, \ 410 .arg_to_user = to_user, \ 411 } 412 413#define MEDIA_IOC(__cmd, func, fl) \ 414 MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user) 415 416/* the table is indexed by _IOC_NR(cmd) */ 417struct media_ioctl_info { 418 unsigned int cmd; 419 unsigned short flags; 420 long (*fn)(struct media_device *dev, void *arg); 421 long (*arg_from_user)(void *karg, void __user *uarg, unsigned int cmd); 422 long (*arg_to_user)(void __user *uarg, void *karg, unsigned int cmd); 423}; 424 425static const struct media_ioctl_info ioctl_info[] = { 426 MEDIA_IOC(DEVICE_INFO, media_device_get_info, MEDIA_IOC_FL_GRAPH_MUTEX), 427 MEDIA_IOC(ENUM_ENTITIES, media_device_enum_entities, MEDIA_IOC_FL_GRAPH_MUTEX), 428 MEDIA_IOC(ENUM_LINKS, media_device_enum_links, MEDIA_IOC_FL_GRAPH_MUTEX), 429 MEDIA_IOC(SETUP_LINK, media_device_setup_link, MEDIA_IOC_FL_GRAPH_MUTEX), 430 MEDIA_IOC(G_TOPOLOGY, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX), 431 MEDIA_IOC(REQUEST_ALLOC, media_device_request_alloc, 0), 432}; 433 434static long media_device_ioctl(struct file *filp, unsigned int cmd, 435 unsigned long __arg) 436{ 437 struct media_devnode *devnode = media_devnode_data(filp); 438 struct media_device *dev = devnode->media_dev; 439 const struct media_ioctl_info *info; 440 void __user *arg = (void __user *)__arg; 441 char __karg[256], *karg = __karg; 442 long ret; 443 444 if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info) 445 || ioctl_info[_IOC_NR(cmd)].cmd != cmd) 446 return -ENOIOCTLCMD; 447 448 info = &ioctl_info[_IOC_NR(cmd)]; 449 450 if (_IOC_SIZE(info->cmd) > sizeof(__karg)) { 451 karg = kmalloc(_IOC_SIZE(info->cmd), GFP_KERNEL); 452 if (!karg) 453 return -ENOMEM; 454 } 455 456 if (info->arg_from_user) { 457 ret = info->arg_from_user(karg, arg, cmd); 458 if (ret) 459 goto out_free; 460 } 461 462 if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX) 463 mutex_lock(&dev->graph_mutex); 464 465 ret = info->fn(dev, karg); 466 467 if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX) 468 mutex_unlock(&dev->graph_mutex); 469 470 if (!ret && info->arg_to_user) 471 ret = info->arg_to_user(arg, karg, cmd); 472 473out_free: 474 if (karg != __karg) 475 kfree(karg); 476 477 return ret; 478} 479 480#ifdef CONFIG_COMPAT 481 482struct media_links_enum32 { 483 __u32 entity; 484 compat_uptr_t pads; /* struct media_pad_desc * */ 485 compat_uptr_t links; /* struct media_link_desc * */ 486 __u32 reserved[4]; 487}; 488 489static long media_device_enum_links32(struct media_device *mdev, 490 struct media_links_enum32 __user *ulinks) 491{ 492 struct media_links_enum links; 493 compat_uptr_t pads_ptr, links_ptr; 494 int ret; 495 496 memset(&links, 0, sizeof(links)); 497 498 if (get_user(links.entity, &ulinks->entity) 499 || get_user(pads_ptr, &ulinks->pads) 500 || get_user(links_ptr, &ulinks->links)) 501 return -EFAULT; 502 503 links.pads = compat_ptr(pads_ptr); 504 links.links = compat_ptr(links_ptr); 505 506 ret = media_device_enum_links(mdev, &links); 507 if (ret) 508 return ret; 509 510 if (copy_to_user(ulinks->reserved, links.reserved, 511 sizeof(ulinks->reserved))) 512 return -EFAULT; 513 return 0; 514} 515 516#define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct media_links_enum32) 517 518static long media_device_compat_ioctl(struct file *filp, unsigned int cmd, 519 unsigned long arg) 520{ 521 struct media_devnode *devnode = media_devnode_data(filp); 522 struct media_device *dev = devnode->media_dev; 523 long ret; 524 525 switch (cmd) { 526 case MEDIA_IOC_ENUM_LINKS32: 527 mutex_lock(&dev->graph_mutex); 528 ret = media_device_enum_links32(dev, 529 (struct media_links_enum32 __user *)arg); 530 mutex_unlock(&dev->graph_mutex); 531 break; 532 533 default: 534 return media_device_ioctl(filp, cmd, arg); 535 } 536 537 return ret; 538} 539#endif /* CONFIG_COMPAT */ 540 541static const struct media_file_operations media_device_fops = { 542 .owner = THIS_MODULE, 543 .open = media_device_open, 544 .ioctl = media_device_ioctl, 545#ifdef CONFIG_COMPAT 546 .compat_ioctl = media_device_compat_ioctl, 547#endif /* CONFIG_COMPAT */ 548 .release = media_device_close, 549}; 550 551/* ----------------------------------------------------------------------------- 552 * sysfs 553 */ 554 555static ssize_t model_show(struct device *cd, 556 struct device_attribute *attr, char *buf) 557{ 558 struct media_devnode *devnode = to_media_devnode(cd); 559 struct media_device *mdev = devnode->media_dev; 560 561 return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model); 562} 563 564static DEVICE_ATTR_RO(model); 565 566/* ----------------------------------------------------------------------------- 567 * Registration/unregistration 568 */ 569 570static void media_device_release(struct media_devnode *devnode) 571{ 572 dev_dbg(devnode->parent, "Media device released\n"); 573} 574 575static void __media_device_unregister_entity(struct media_entity *entity) 576{ 577 struct media_device *mdev = entity->graph_obj.mdev; 578 struct media_link *link, *tmp; 579 struct media_interface *intf; 580 struct media_pad *iter; 581 582 ida_free(&mdev->entity_internal_idx, entity->internal_idx); 583 584 /* Remove all interface links pointing to this entity */ 585 list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) { 586 list_for_each_entry_safe(link, tmp, &intf->links, list) { 587 if (link->entity == entity) 588 __media_remove_intf_link(link); 589 } 590 } 591 592 /* Remove all data links that belong to this entity */ 593 __media_entity_remove_links(entity); 594 595 /* Remove all pads that belong to this entity */ 596 media_entity_for_each_pad(entity, iter) 597 media_gobj_destroy(&iter->graph_obj); 598 599 /* Remove the entity */ 600 media_gobj_destroy(&entity->graph_obj); 601 602 /* invoke entity_notify callbacks to handle entity removal?? */ 603} 604 605int __must_check media_device_register_entity(struct media_device *mdev, 606 struct media_entity *entity) 607{ 608 struct media_entity_notify *notify, *next; 609 struct media_pad *iter; 610 int ret; 611 612 if (entity->function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN || 613 entity->function == MEDIA_ENT_F_UNKNOWN) 614 dev_warn(mdev->dev, 615 "Entity type for entity %s was not initialized!\n", 616 entity->name); 617 618 /* Warn if we apparently re-register an entity */ 619 WARN_ON(entity->graph_obj.mdev != NULL); 620 entity->graph_obj.mdev = mdev; 621 INIT_LIST_HEAD(&entity->links); 622 entity->num_links = 0; 623 entity->num_backlinks = 0; 624 625 ret = ida_alloc_min(&mdev->entity_internal_idx, 1, GFP_KERNEL); 626 if (ret < 0) 627 return ret; 628 entity->internal_idx = ret; 629 630 mutex_lock(&mdev->graph_mutex); 631 mdev->entity_internal_idx_max = 632 max(mdev->entity_internal_idx_max, entity->internal_idx); 633 634 /* Initialize media_gobj embedded at the entity */ 635 media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj); 636 637 /* Initialize objects at the pads */ 638 media_entity_for_each_pad(entity, iter) 639 media_gobj_create(mdev, MEDIA_GRAPH_PAD, &iter->graph_obj); 640 641 /* invoke entity_notify callbacks */ 642 list_for_each_entry_safe(notify, next, &mdev->entity_notify, list) 643 notify->notify(entity, notify->notify_data); 644 645 if (mdev->entity_internal_idx_max 646 >= mdev->pm_count_walk.ent_enum.idx_max) { 647 struct media_graph new = { .top = 0 }; 648 649 /* 650 * Initialise the new graph walk before cleaning up 651 * the old one in order not to spoil the graph walk 652 * object of the media device if graph walk init fails. 653 */ 654 ret = media_graph_walk_init(&new, mdev); 655 if (ret) { 656 __media_device_unregister_entity(entity); 657 mutex_unlock(&mdev->graph_mutex); 658 return ret; 659 } 660 media_graph_walk_cleanup(&mdev->pm_count_walk); 661 mdev->pm_count_walk = new; 662 } 663 mutex_unlock(&mdev->graph_mutex); 664 665 return 0; 666} 667EXPORT_SYMBOL_GPL(media_device_register_entity); 668 669void media_device_unregister_entity(struct media_entity *entity) 670{ 671 struct media_device *mdev = entity->graph_obj.mdev; 672 673 if (mdev == NULL) 674 return; 675 676 mutex_lock(&mdev->graph_mutex); 677 __media_device_unregister_entity(entity); 678 mutex_unlock(&mdev->graph_mutex); 679} 680EXPORT_SYMBOL_GPL(media_device_unregister_entity); 681 682void media_device_init(struct media_device *mdev) 683{ 684 INIT_LIST_HEAD(&mdev->entities); 685 INIT_LIST_HEAD(&mdev->interfaces); 686 INIT_LIST_HEAD(&mdev->pads); 687 INIT_LIST_HEAD(&mdev->links); 688 INIT_LIST_HEAD(&mdev->entity_notify); 689 690 mutex_init(&mdev->req_queue_mutex); 691 mutex_init(&mdev->graph_mutex); 692 ida_init(&mdev->entity_internal_idx); 693 694 atomic_set(&mdev->request_id, 0); 695 696 if (!*mdev->bus_info) 697 media_set_bus_info(mdev->bus_info, sizeof(mdev->bus_info), 698 mdev->dev); 699 700 dev_dbg(mdev->dev, "Media device initialized\n"); 701} 702EXPORT_SYMBOL_GPL(media_device_init); 703 704void media_device_cleanup(struct media_device *mdev) 705{ 706 ida_destroy(&mdev->entity_internal_idx); 707 mdev->entity_internal_idx_max = 0; 708 media_graph_walk_cleanup(&mdev->pm_count_walk); 709 mutex_destroy(&mdev->graph_mutex); 710 mutex_destroy(&mdev->req_queue_mutex); 711} 712EXPORT_SYMBOL_GPL(media_device_cleanup); 713 714int __must_check __media_device_register(struct media_device *mdev, 715 struct module *owner) 716{ 717 struct media_devnode *devnode; 718 int ret; 719 720 devnode = kzalloc(sizeof(*devnode), GFP_KERNEL); 721 if (!devnode) 722 return -ENOMEM; 723 724 /* Register the device node. */ 725 mdev->devnode = devnode; 726 devnode->fops = &media_device_fops; 727 devnode->parent = mdev->dev; 728 devnode->release = media_device_release; 729 730 /* Set version 0 to indicate user-space that the graph is static */ 731 mdev->topology_version = 0; 732 733 ret = media_devnode_register(mdev, devnode, owner); 734 if (ret < 0) { 735 /* devnode free is handled in media_devnode_*() */ 736 mdev->devnode = NULL; 737 return ret; 738 } 739 740 ret = device_create_file(&devnode->dev, &dev_attr_model); 741 if (ret < 0) { 742 /* devnode free is handled in media_devnode_*() */ 743 mdev->devnode = NULL; 744 media_devnode_unregister_prepare(devnode); 745 media_devnode_unregister(devnode); 746 return ret; 747 } 748 749 dev_dbg(mdev->dev, "Media device registered\n"); 750 751 return 0; 752} 753EXPORT_SYMBOL_GPL(__media_device_register); 754 755void media_device_register_entity_notify(struct media_device *mdev, 756 struct media_entity_notify *nptr) 757{ 758 mutex_lock(&mdev->graph_mutex); 759 list_add_tail(&nptr->list, &mdev->entity_notify); 760 mutex_unlock(&mdev->graph_mutex); 761} 762EXPORT_SYMBOL_GPL(media_device_register_entity_notify); 763 764/* 765 * Note: Should be called with mdev->lock held. 766 */ 767static void __media_device_unregister_entity_notify(struct media_device *mdev, 768 struct media_entity_notify *nptr) 769{ 770 list_del(&nptr->list); 771} 772 773void media_device_unregister_entity_notify(struct media_device *mdev, 774 struct media_entity_notify *nptr) 775{ 776 mutex_lock(&mdev->graph_mutex); 777 __media_device_unregister_entity_notify(mdev, nptr); 778 mutex_unlock(&mdev->graph_mutex); 779} 780EXPORT_SYMBOL_GPL(media_device_unregister_entity_notify); 781 782void media_device_unregister(struct media_device *mdev) 783{ 784 struct media_entity *entity; 785 struct media_entity *next; 786 struct media_interface *intf, *tmp_intf; 787 struct media_entity_notify *notify, *nextp; 788 789 if (mdev == NULL) 790 return; 791 792 mutex_lock(&mdev->graph_mutex); 793 794 /* Check if mdev was ever registered at all */ 795 if (!media_devnode_is_registered(mdev->devnode)) { 796 mutex_unlock(&mdev->graph_mutex); 797 return; 798 } 799 800 /* Clear the devnode register bit to avoid races with media dev open */ 801 media_devnode_unregister_prepare(mdev->devnode); 802 803 /* Remove all entities from the media device */ 804 list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list) 805 __media_device_unregister_entity(entity); 806 807 /* Remove all entity_notify callbacks from the media device */ 808 list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list) 809 __media_device_unregister_entity_notify(mdev, notify); 810 811 /* Remove all interfaces from the media device */ 812 list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces, 813 graph_obj.list) { 814 /* 815 * Unlink the interface, but don't free it here; the 816 * module which created it is responsible for freeing 817 * it 818 */ 819 __media_remove_intf_links(intf); 820 media_gobj_destroy(&intf->graph_obj); 821 } 822 823 mutex_unlock(&mdev->graph_mutex); 824 825 dev_dbg(mdev->dev, "Media device unregistered\n"); 826 827 device_remove_file(&mdev->devnode->dev, &dev_attr_model); 828 media_devnode_unregister(mdev->devnode); 829 /* devnode free is handled in media_devnode_*() */ 830 mdev->devnode = NULL; 831} 832EXPORT_SYMBOL_GPL(media_device_unregister); 833 834#if IS_ENABLED(CONFIG_PCI) 835void media_device_pci_init(struct media_device *mdev, 836 struct pci_dev *pci_dev, 837 const char *name) 838{ 839 mdev->dev = &pci_dev->dev; 840 841 if (name) 842 strscpy(mdev->model, name, sizeof(mdev->model)); 843 else 844 strscpy(mdev->model, pci_name(pci_dev), sizeof(mdev->model)); 845 846 sprintf(mdev->bus_info, "PCI:%s", pci_name(pci_dev)); 847 848 mdev->hw_revision = (pci_dev->subsystem_vendor << 16) 849 | pci_dev->subsystem_device; 850 851 media_device_init(mdev); 852} 853EXPORT_SYMBOL_GPL(media_device_pci_init); 854#endif 855 856#if IS_ENABLED(CONFIG_USB) 857void __media_device_usb_init(struct media_device *mdev, 858 struct usb_device *udev, 859 const char *board_name, 860 const char *driver_name) 861{ 862 mdev->dev = &udev->dev; 863 864 if (driver_name) 865 strscpy(mdev->driver_name, driver_name, 866 sizeof(mdev->driver_name)); 867 868 if (board_name) 869 strscpy(mdev->model, board_name, sizeof(mdev->model)); 870 else if (udev->product) 871 strscpy(mdev->model, udev->product, sizeof(mdev->model)); 872 else 873 strscpy(mdev->model, "unknown model", sizeof(mdev->model)); 874 if (udev->serial) 875 strscpy(mdev->serial, udev->serial, sizeof(mdev->serial)); 876 usb_make_path(udev, mdev->bus_info, sizeof(mdev->bus_info)); 877 mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice); 878 879 media_device_init(mdev); 880} 881EXPORT_SYMBOL_GPL(__media_device_usb_init); 882#endif 883 884 885#endif /* CONFIG_MEDIA_CONTROLLER */ 886