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 43 static inline void __user *media_get_uptr(__u64 arg) 44 { 45 return (void __user *)(uintptr_t)arg; 46 } 47 48 static int media_device_open(struct file *filp) 49 { 50 return 0; 51 } 52 53 static int media_device_close(struct file *filp) 54 { 55 return 0; 56 } 57 58 static 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 81 static 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 98 static 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 } 142 143 static 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 } 150 151 static 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 } 199 200 static 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 } 229 230 static 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 } 372 373 static long media_device_request_alloc(struct media_device *mdev, 374 int *alloc_fd) 375 { 376 #ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API 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 #else 382 return -ENOTTY; 383 #endif 384 } 385 386 static long copy_arg_from_user(void *karg, void __user *uarg, unsigned int cmd) 387 { 388 if ((_IOC_DIR(cmd) & _IOC_WRITE) && 389 copy_from_user(karg, uarg, _IOC_SIZE(cmd))) 390 return -EFAULT; 391 392 return 0; 393 } 394 395 static long copy_arg_to_user(void __user *uarg, void *karg, unsigned int cmd) 396 { 397 if ((_IOC_DIR(cmd) & _IOC_READ) && 398 copy_to_user(uarg, karg, _IOC_SIZE(cmd))) 399 return -EFAULT; 400 401 return 0; 402 } 403 404 /* Do acquire the graph mutex */ 405 #define MEDIA_IOC_FL_GRAPH_MUTEX BIT(0) 406 407 #define MEDIA_IOC_ARG(__cmd, func, fl, from_user, to_user) \ 408 [_IOC_NR(MEDIA_IOC_##__cmd)] = { \ 409 .cmd = MEDIA_IOC_##__cmd, \ 410 .fn = (long (*)(struct media_device *, void *))func, \ 411 .flags = fl, \ 412 .arg_from_user = from_user, \ 413 .arg_to_user = to_user, \ 414 } 415 416 #define MEDIA_IOC(__cmd, func, fl) \ 417 MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user) 418 419 /* the table is indexed by _IOC_NR(cmd) */ 420 struct media_ioctl_info { 421 unsigned int cmd; 422 unsigned short flags; 423 long (*fn)(struct media_device *dev, void *arg); 424 long (*arg_from_user)(void *karg, void __user *uarg, unsigned int cmd); 425 long (*arg_to_user)(void __user *uarg, void *karg, unsigned int cmd); 426 }; 427 428 static const struct media_ioctl_info ioctl_info[] = { 429 MEDIA_IOC(DEVICE_INFO, media_device_get_info, MEDIA_IOC_FL_GRAPH_MUTEX), 430 MEDIA_IOC(ENUM_ENTITIES, media_device_enum_entities, MEDIA_IOC_FL_GRAPH_MUTEX), 431 MEDIA_IOC(ENUM_LINKS, media_device_enum_links, MEDIA_IOC_FL_GRAPH_MUTEX), 432 MEDIA_IOC(SETUP_LINK, media_device_setup_link, MEDIA_IOC_FL_GRAPH_MUTEX), 433 MEDIA_IOC(G_TOPOLOGY, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX), 434 MEDIA_IOC(REQUEST_ALLOC, media_device_request_alloc, 0), 435 }; 436 437 static long media_device_ioctl(struct file *filp, unsigned int cmd, 438 unsigned long __arg) 439 { 440 struct media_devnode *devnode = media_devnode_data(filp); 441 struct media_device *dev = devnode->media_dev; 442 const struct media_ioctl_info *info; 443 void __user *arg = (void __user *)__arg; 444 char __karg[256], *karg = __karg; 445 long ret; 446 447 if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info) 448 || ioctl_info[_IOC_NR(cmd)].cmd != cmd) 449 return -ENOIOCTLCMD; 450 451 info = &ioctl_info[_IOC_NR(cmd)]; 452 453 if (_IOC_SIZE(info->cmd) > sizeof(__karg)) { 454 karg = kmalloc(_IOC_SIZE(info->cmd), GFP_KERNEL); 455 if (!karg) 456 return -ENOMEM; 457 } 458 459 if (info->arg_from_user) { 460 ret = info->arg_from_user(karg, arg, cmd); 461 if (ret) 462 goto out_free; 463 } 464 465 if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX) 466 mutex_lock(&dev->graph_mutex); 467 468 ret = info->fn(dev, karg); 469 470 if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX) 471 mutex_unlock(&dev->graph_mutex); 472 473 if (!ret && info->arg_to_user) 474 ret = info->arg_to_user(arg, karg, cmd); 475 476 out_free: 477 if (karg != __karg) 478 kfree(karg); 479 480 return ret; 481 } 482 483 #ifdef CONFIG_COMPAT 484 485 struct media_links_enum32 { 486 __u32 entity; 487 compat_uptr_t pads; /* struct media_pad_desc * */ 488 compat_uptr_t links; /* struct media_link_desc * */ 489 __u32 reserved[4]; 490 }; 491 492 static long media_device_enum_links32(struct media_device *mdev, 493 struct media_links_enum32 __user *ulinks) 494 { 495 struct media_links_enum links; 496 compat_uptr_t pads_ptr, links_ptr; 497 int ret; 498 499 memset(&links, 0, sizeof(links)); 500 501 if (get_user(links.entity, &ulinks->entity) 502 || get_user(pads_ptr, &ulinks->pads) 503 || get_user(links_ptr, &ulinks->links)) 504 return -EFAULT; 505 506 links.pads = compat_ptr(pads_ptr); 507 links.links = compat_ptr(links_ptr); 508 509 ret = media_device_enum_links(mdev, &links); 510 if (ret) 511 return ret; 512 513 if (copy_to_user(ulinks->reserved, links.reserved, 514 sizeof(ulinks->reserved))) 515 return -EFAULT; 516 return 0; 517 } 518 519 #define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct media_links_enum32) 520 521 static long media_device_compat_ioctl(struct file *filp, unsigned int cmd, 522 unsigned long arg) 523 { 524 struct media_devnode *devnode = media_devnode_data(filp); 525 struct media_device *dev = devnode->media_dev; 526 long ret; 527 528 switch (cmd) { 529 case MEDIA_IOC_ENUM_LINKS32: 530 mutex_lock(&dev->graph_mutex); 531 ret = media_device_enum_links32(dev, 532 (struct media_links_enum32 __user *)arg); 533 mutex_unlock(&dev->graph_mutex); 534 break; 535 536 default: 537 return media_device_ioctl(filp, cmd, arg); 538 } 539 540 return ret; 541 } 542 #endif /* CONFIG_COMPAT */ 543 544 static const struct media_file_operations media_device_fops = { 545 .owner = THIS_MODULE, 546 .open = media_device_open, 547 .ioctl = media_device_ioctl, 548 #ifdef CONFIG_COMPAT 549 .compat_ioctl = media_device_compat_ioctl, 550 #endif /* CONFIG_COMPAT */ 551 .release = media_device_close, 552 }; 553 554 /* ----------------------------------------------------------------------------- 555 * sysfs 556 */ 557 558 static ssize_t show_model(struct device *cd, 559 struct device_attribute *attr, char *buf) 560 { 561 struct media_devnode *devnode = to_media_devnode(cd); 562 struct media_device *mdev = devnode->media_dev; 563 564 return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model); 565 } 566 567 static DEVICE_ATTR(model, S_IRUGO, show_model, NULL); 568 569 /* ----------------------------------------------------------------------------- 570 * Registration/unregistration 571 */ 572 573 static void media_device_release(struct media_devnode *devnode) 574 { 575 dev_dbg(devnode->parent, "Media device released\n"); 576 } 577 578 static void __media_device_unregister_entity(struct media_entity *entity) 579 { 580 struct media_device *mdev = entity->graph_obj.mdev; 581 struct media_link *link, *tmp; 582 struct media_interface *intf; 583 unsigned int i; 584 585 ida_free(&mdev->entity_internal_idx, entity->internal_idx); 586 587 /* Remove all interface links pointing to this entity */ 588 list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) { 589 list_for_each_entry_safe(link, tmp, &intf->links, list) { 590 if (link->entity == entity) 591 __media_remove_intf_link(link); 592 } 593 } 594 595 /* Remove all data links that belong to this entity */ 596 __media_entity_remove_links(entity); 597 598 /* Remove all pads that belong to this entity */ 599 for (i = 0; i < entity->num_pads; i++) 600 media_gobj_destroy(&entity->pads[i].graph_obj); 601 602 /* Remove the entity */ 603 media_gobj_destroy(&entity->graph_obj); 604 605 /* invoke entity_notify callbacks to handle entity removal?? */ 606 607 entity->graph_obj.mdev = NULL; 608 } 609 610 /** 611 * media_device_register_entity - Register an entity with a media device 612 * @mdev: The media device 613 * @entity: The entity 614 */ 615 int __must_check media_device_register_entity(struct media_device *mdev, 616 struct media_entity *entity) 617 { 618 struct media_entity_notify *notify, *next; 619 unsigned int i; 620 int ret; 621 622 if (entity->function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN || 623 entity->function == MEDIA_ENT_F_UNKNOWN) 624 dev_warn(mdev->dev, 625 "Entity type for entity %s was not initialized!\n", 626 entity->name); 627 628 /* Warn if we apparently re-register an entity */ 629 WARN_ON(entity->graph_obj.mdev != NULL); 630 entity->graph_obj.mdev = mdev; 631 INIT_LIST_HEAD(&entity->links); 632 entity->num_links = 0; 633 entity->num_backlinks = 0; 634 635 ret = ida_alloc_min(&mdev->entity_internal_idx, 1, GFP_KERNEL); 636 if (ret < 0) 637 return ret; 638 entity->internal_idx = ret; 639 640 mutex_lock(&mdev->graph_mutex); 641 mdev->entity_internal_idx_max = 642 max(mdev->entity_internal_idx_max, entity->internal_idx); 643 644 /* Initialize media_gobj embedded at the entity */ 645 media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj); 646 647 /* Initialize objects at the pads */ 648 for (i = 0; i < entity->num_pads; i++) 649 media_gobj_create(mdev, MEDIA_GRAPH_PAD, 650 &entity->pads[i].graph_obj); 651 652 /* invoke entity_notify callbacks */ 653 list_for_each_entry_safe(notify, next, &mdev->entity_notify, list) 654 notify->notify(entity, notify->notify_data); 655 656 if (mdev->entity_internal_idx_max 657 >= mdev->pm_count_walk.ent_enum.idx_max) { 658 struct media_graph new = { .top = 0 }; 659 660 /* 661 * Initialise the new graph walk before cleaning up 662 * the old one in order not to spoil the graph walk 663 * object of the media device if graph walk init fails. 664 */ 665 ret = media_graph_walk_init(&new, mdev); 666 if (ret) { 667 __media_device_unregister_entity(entity); 668 mutex_unlock(&mdev->graph_mutex); 669 return ret; 670 } 671 media_graph_walk_cleanup(&mdev->pm_count_walk); 672 mdev->pm_count_walk = new; 673 } 674 mutex_unlock(&mdev->graph_mutex); 675 676 return 0; 677 } 678 EXPORT_SYMBOL_GPL(media_device_register_entity); 679 680 void media_device_unregister_entity(struct media_entity *entity) 681 { 682 struct media_device *mdev = entity->graph_obj.mdev; 683 684 if (mdev == NULL) 685 return; 686 687 mutex_lock(&mdev->graph_mutex); 688 __media_device_unregister_entity(entity); 689 mutex_unlock(&mdev->graph_mutex); 690 } 691 EXPORT_SYMBOL_GPL(media_device_unregister_entity); 692 693 /** 694 * media_device_init() - initialize a media device 695 * @mdev: The media device 696 * 697 * The caller is responsible for initializing the media device before 698 * registration. The following fields must be set: 699 * 700 * - dev must point to the parent device 701 * - model must be filled with the device model name 702 */ 703 void media_device_init(struct media_device *mdev) 704 { 705 INIT_LIST_HEAD(&mdev->entities); 706 INIT_LIST_HEAD(&mdev->interfaces); 707 INIT_LIST_HEAD(&mdev->pads); 708 INIT_LIST_HEAD(&mdev->links); 709 INIT_LIST_HEAD(&mdev->entity_notify); 710 711 mutex_init(&mdev->req_queue_mutex); 712 mutex_init(&mdev->graph_mutex); 713 ida_init(&mdev->entity_internal_idx); 714 715 atomic_set(&mdev->request_id, 0); 716 717 dev_dbg(mdev->dev, "Media device initialized\n"); 718 } 719 EXPORT_SYMBOL_GPL(media_device_init); 720 721 void media_device_cleanup(struct media_device *mdev) 722 { 723 ida_destroy(&mdev->entity_internal_idx); 724 mdev->entity_internal_idx_max = 0; 725 media_graph_walk_cleanup(&mdev->pm_count_walk); 726 mutex_destroy(&mdev->graph_mutex); 727 mutex_destroy(&mdev->req_queue_mutex); 728 } 729 EXPORT_SYMBOL_GPL(media_device_cleanup); 730 731 int __must_check __media_device_register(struct media_device *mdev, 732 struct module *owner) 733 { 734 struct media_devnode *devnode; 735 int ret; 736 737 devnode = kzalloc(sizeof(*devnode), GFP_KERNEL); 738 if (!devnode) 739 return -ENOMEM; 740 741 /* Register the device node. */ 742 mdev->devnode = devnode; 743 devnode->fops = &media_device_fops; 744 devnode->parent = mdev->dev; 745 devnode->release = media_device_release; 746 747 /* Set version 0 to indicate user-space that the graph is static */ 748 mdev->topology_version = 0; 749 750 ret = media_devnode_register(mdev, devnode, owner); 751 if (ret < 0) { 752 /* devnode free is handled in media_devnode_*() */ 753 mdev->devnode = NULL; 754 return ret; 755 } 756 757 ret = device_create_file(&devnode->dev, &dev_attr_model); 758 if (ret < 0) { 759 /* devnode free is handled in media_devnode_*() */ 760 mdev->devnode = NULL; 761 media_devnode_unregister_prepare(devnode); 762 media_devnode_unregister(devnode); 763 return ret; 764 } 765 766 dev_dbg(mdev->dev, "Media device registered\n"); 767 768 return 0; 769 } 770 EXPORT_SYMBOL_GPL(__media_device_register); 771 772 int __must_check media_device_register_entity_notify(struct media_device *mdev, 773 struct media_entity_notify *nptr) 774 { 775 mutex_lock(&mdev->graph_mutex); 776 list_add_tail(&nptr->list, &mdev->entity_notify); 777 mutex_unlock(&mdev->graph_mutex); 778 return 0; 779 } 780 EXPORT_SYMBOL_GPL(media_device_register_entity_notify); 781 782 /* 783 * Note: Should be called with mdev->lock held. 784 */ 785 static void __media_device_unregister_entity_notify(struct media_device *mdev, 786 struct media_entity_notify *nptr) 787 { 788 list_del(&nptr->list); 789 } 790 791 void media_device_unregister_entity_notify(struct media_device *mdev, 792 struct media_entity_notify *nptr) 793 { 794 mutex_lock(&mdev->graph_mutex); 795 __media_device_unregister_entity_notify(mdev, nptr); 796 mutex_unlock(&mdev->graph_mutex); 797 } 798 EXPORT_SYMBOL_GPL(media_device_unregister_entity_notify); 799 800 void media_device_unregister(struct media_device *mdev) 801 { 802 struct media_entity *entity; 803 struct media_entity *next; 804 struct media_interface *intf, *tmp_intf; 805 struct media_entity_notify *notify, *nextp; 806 807 if (mdev == NULL) 808 return; 809 810 mutex_lock(&mdev->graph_mutex); 811 812 /* Check if mdev was ever registered at all */ 813 if (!media_devnode_is_registered(mdev->devnode)) { 814 mutex_unlock(&mdev->graph_mutex); 815 return; 816 } 817 818 /* Clear the devnode register bit to avoid races with media dev open */ 819 media_devnode_unregister_prepare(mdev->devnode); 820 821 /* Remove all entities from the media device */ 822 list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list) 823 __media_device_unregister_entity(entity); 824 825 /* Remove all entity_notify callbacks from the media device */ 826 list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list) 827 __media_device_unregister_entity_notify(mdev, notify); 828 829 /* Remove all interfaces from the media device */ 830 list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces, 831 graph_obj.list) { 832 /* 833 * Unlink the interface, but don't free it here; the 834 * module which created it is responsible for freeing 835 * it 836 */ 837 __media_remove_intf_links(intf); 838 media_gobj_destroy(&intf->graph_obj); 839 } 840 841 mutex_unlock(&mdev->graph_mutex); 842 843 dev_dbg(mdev->dev, "Media device unregistered\n"); 844 845 device_remove_file(&mdev->devnode->dev, &dev_attr_model); 846 media_devnode_unregister(mdev->devnode); 847 /* devnode free is handled in media_devnode_*() */ 848 mdev->devnode = NULL; 849 } 850 EXPORT_SYMBOL_GPL(media_device_unregister); 851 852 #if IS_ENABLED(CONFIG_PCI) 853 void media_device_pci_init(struct media_device *mdev, 854 struct pci_dev *pci_dev, 855 const char *name) 856 { 857 mdev->dev = &pci_dev->dev; 858 859 if (name) 860 strscpy(mdev->model, name, sizeof(mdev->model)); 861 else 862 strscpy(mdev->model, pci_name(pci_dev), sizeof(mdev->model)); 863 864 sprintf(mdev->bus_info, "PCI:%s", pci_name(pci_dev)); 865 866 mdev->hw_revision = (pci_dev->subsystem_vendor << 16) 867 | pci_dev->subsystem_device; 868 869 media_device_init(mdev); 870 } 871 EXPORT_SYMBOL_GPL(media_device_pci_init); 872 #endif 873 874 #if IS_ENABLED(CONFIG_USB) 875 void __media_device_usb_init(struct media_device *mdev, 876 struct usb_device *udev, 877 const char *board_name, 878 const char *driver_name) 879 { 880 mdev->dev = &udev->dev; 881 882 if (driver_name) 883 strscpy(mdev->driver_name, driver_name, 884 sizeof(mdev->driver_name)); 885 886 if (board_name) 887 strscpy(mdev->model, board_name, sizeof(mdev->model)); 888 else if (udev->product) 889 strscpy(mdev->model, udev->product, sizeof(mdev->model)); 890 else 891 strscpy(mdev->model, "unknown model", sizeof(mdev->model)); 892 if (udev->serial) 893 strscpy(mdev->serial, udev->serial, sizeof(mdev->serial)); 894 usb_make_path(udev, mdev->bus_info, sizeof(mdev->bus_info)); 895 mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice); 896 897 media_device_init(mdev); 898 } 899 EXPORT_SYMBOL_GPL(__media_device_usb_init); 900 #endif 901 902 903 #endif /* CONFIG_MEDIA_CONTROLLER */ 904