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, void *arg) 374 { 375 #ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API 376 int *alloc_fd = arg; 377 378 if (!mdev->ops || !mdev->ops->req_validate || !mdev->ops->req_queue) 379 return -ENOTTY; 380 381 return media_request_alloc(mdev, alloc_fd); 382 #else 383 return -ENOTTY; 384 #endif 385 } 386 387 static long copy_arg_from_user(void *karg, void __user *uarg, unsigned int cmd) 388 { 389 if ((_IOC_DIR(cmd) & _IOC_WRITE) && 390 copy_from_user(karg, uarg, _IOC_SIZE(cmd))) 391 return -EFAULT; 392 393 return 0; 394 } 395 396 static long copy_arg_to_user(void __user *uarg, void *karg, unsigned int cmd) 397 { 398 if ((_IOC_DIR(cmd) & _IOC_READ) && 399 copy_to_user(uarg, karg, _IOC_SIZE(cmd))) 400 return -EFAULT; 401 402 return 0; 403 } 404 405 /* Do acquire the graph mutex */ 406 #define MEDIA_IOC_FL_GRAPH_MUTEX BIT(0) 407 408 #define MEDIA_IOC_ARG(__cmd, func, fl, from_user, to_user) \ 409 [_IOC_NR(MEDIA_IOC_##__cmd)] = { \ 410 .cmd = MEDIA_IOC_##__cmd, \ 411 .fn = func, \ 412 .flags = fl, \ 413 .arg_from_user = from_user, \ 414 .arg_to_user = to_user, \ 415 } 416 417 #define MEDIA_IOC(__cmd, func, fl) \ 418 MEDIA_IOC_ARG(__cmd, func, fl, copy_arg_from_user, copy_arg_to_user) 419 420 /* the table is indexed by _IOC_NR(cmd) */ 421 struct media_ioctl_info { 422 unsigned int cmd; 423 unsigned short flags; 424 long (*fn)(struct media_device *dev, void *arg); 425 long (*arg_from_user)(void *karg, void __user *uarg, unsigned int cmd); 426 long (*arg_to_user)(void __user *uarg, void *karg, unsigned int cmd); 427 }; 428 429 static const struct media_ioctl_info ioctl_info[] = { 430 MEDIA_IOC(DEVICE_INFO, media_device_get_info, MEDIA_IOC_FL_GRAPH_MUTEX), 431 MEDIA_IOC(ENUM_ENTITIES, media_device_enum_entities, MEDIA_IOC_FL_GRAPH_MUTEX), 432 MEDIA_IOC(ENUM_LINKS, media_device_enum_links, MEDIA_IOC_FL_GRAPH_MUTEX), 433 MEDIA_IOC(SETUP_LINK, media_device_setup_link, MEDIA_IOC_FL_GRAPH_MUTEX), 434 MEDIA_IOC(G_TOPOLOGY, media_device_get_topology, MEDIA_IOC_FL_GRAPH_MUTEX), 435 MEDIA_IOC(REQUEST_ALLOC, media_device_request_alloc, 0), 436 }; 437 438 static long media_device_ioctl(struct file *filp, unsigned int cmd, 439 unsigned long __arg) 440 { 441 struct media_devnode *devnode = media_devnode_data(filp); 442 struct media_device *dev = devnode->media_dev; 443 const struct media_ioctl_info *info; 444 void __user *arg = (void __user *)__arg; 445 char __karg[256], *karg = __karg; 446 long ret; 447 448 if (_IOC_NR(cmd) >= ARRAY_SIZE(ioctl_info) 449 || ioctl_info[_IOC_NR(cmd)].cmd != cmd) 450 return -ENOIOCTLCMD; 451 452 info = &ioctl_info[_IOC_NR(cmd)]; 453 454 if (_IOC_SIZE(info->cmd) > sizeof(__karg)) { 455 karg = kmalloc(_IOC_SIZE(info->cmd), GFP_KERNEL); 456 if (!karg) 457 return -ENOMEM; 458 } 459 460 if (info->arg_from_user) { 461 ret = info->arg_from_user(karg, arg, cmd); 462 if (ret) 463 goto out_free; 464 } 465 466 if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX) 467 mutex_lock(&dev->graph_mutex); 468 469 ret = info->fn(dev, karg); 470 471 if (info->flags & MEDIA_IOC_FL_GRAPH_MUTEX) 472 mutex_unlock(&dev->graph_mutex); 473 474 if (!ret && info->arg_to_user) 475 ret = info->arg_to_user(arg, karg, cmd); 476 477 out_free: 478 if (karg != __karg) 479 kfree(karg); 480 481 return ret; 482 } 483 484 #ifdef CONFIG_COMPAT 485 486 struct media_links_enum32 { 487 __u32 entity; 488 compat_uptr_t pads; /* struct media_pad_desc * */ 489 compat_uptr_t links; /* struct media_link_desc * */ 490 __u32 reserved[4]; 491 }; 492 493 static long media_device_enum_links32(struct media_device *mdev, 494 struct media_links_enum32 __user *ulinks) 495 { 496 struct media_links_enum links; 497 compat_uptr_t pads_ptr, links_ptr; 498 int ret; 499 500 memset(&links, 0, sizeof(links)); 501 502 if (get_user(links.entity, &ulinks->entity) 503 || get_user(pads_ptr, &ulinks->pads) 504 || get_user(links_ptr, &ulinks->links)) 505 return -EFAULT; 506 507 links.pads = compat_ptr(pads_ptr); 508 links.links = compat_ptr(links_ptr); 509 510 ret = media_device_enum_links(mdev, &links); 511 if (ret) 512 return ret; 513 514 if (copy_to_user(ulinks->reserved, links.reserved, 515 sizeof(ulinks->reserved))) 516 return -EFAULT; 517 return 0; 518 } 519 520 #define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct media_links_enum32) 521 522 static long media_device_compat_ioctl(struct file *filp, unsigned int cmd, 523 unsigned long arg) 524 { 525 struct media_devnode *devnode = media_devnode_data(filp); 526 struct media_device *dev = devnode->media_dev; 527 long ret; 528 529 switch (cmd) { 530 case MEDIA_IOC_ENUM_LINKS32: 531 mutex_lock(&dev->graph_mutex); 532 ret = media_device_enum_links32(dev, 533 (struct media_links_enum32 __user *)arg); 534 mutex_unlock(&dev->graph_mutex); 535 break; 536 537 default: 538 return media_device_ioctl(filp, cmd, arg); 539 } 540 541 return ret; 542 } 543 #endif /* CONFIG_COMPAT */ 544 545 static const struct media_file_operations media_device_fops = { 546 .owner = THIS_MODULE, 547 .open = media_device_open, 548 .ioctl = media_device_ioctl, 549 #ifdef CONFIG_COMPAT 550 .compat_ioctl = media_device_compat_ioctl, 551 #endif /* CONFIG_COMPAT */ 552 .release = media_device_close, 553 }; 554 555 /* ----------------------------------------------------------------------------- 556 * sysfs 557 */ 558 559 static ssize_t show_model(struct device *cd, 560 struct device_attribute *attr, char *buf) 561 { 562 struct media_devnode *devnode = to_media_devnode(cd); 563 struct media_device *mdev = devnode->media_dev; 564 565 return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model); 566 } 567 568 static DEVICE_ATTR(model, S_IRUGO, show_model, NULL); 569 570 /* ----------------------------------------------------------------------------- 571 * Registration/unregistration 572 */ 573 574 static void media_device_release(struct media_devnode *devnode) 575 { 576 dev_dbg(devnode->parent, "Media device released\n"); 577 } 578 579 static void __media_device_unregister_entity(struct media_entity *entity) 580 { 581 struct media_device *mdev = entity->graph_obj.mdev; 582 struct media_link *link, *tmp; 583 struct media_interface *intf; 584 unsigned int i; 585 586 ida_free(&mdev->entity_internal_idx, entity->internal_idx); 587 588 /* Remove all interface links pointing to this entity */ 589 list_for_each_entry(intf, &mdev->interfaces, graph_obj.list) { 590 list_for_each_entry_safe(link, tmp, &intf->links, list) { 591 if (link->entity == entity) 592 __media_remove_intf_link(link); 593 } 594 } 595 596 /* Remove all data links that belong to this entity */ 597 __media_entity_remove_links(entity); 598 599 /* Remove all pads that belong to this entity */ 600 for (i = 0; i < entity->num_pads; i++) 601 media_gobj_destroy(&entity->pads[i].graph_obj); 602 603 /* Remove the entity */ 604 media_gobj_destroy(&entity->graph_obj); 605 606 /* invoke entity_notify callbacks to handle entity removal?? */ 607 608 entity->graph_obj.mdev = NULL; 609 } 610 611 /** 612 * media_device_register_entity - Register an entity with a media device 613 * @mdev: The media device 614 * @entity: The entity 615 */ 616 int __must_check media_device_register_entity(struct media_device *mdev, 617 struct media_entity *entity) 618 { 619 struct media_entity_notify *notify, *next; 620 unsigned int i; 621 int ret; 622 623 if (entity->function == MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN || 624 entity->function == MEDIA_ENT_F_UNKNOWN) 625 dev_warn(mdev->dev, 626 "Entity type for entity %s was not initialized!\n", 627 entity->name); 628 629 /* Warn if we apparently re-register an entity */ 630 WARN_ON(entity->graph_obj.mdev != NULL); 631 entity->graph_obj.mdev = mdev; 632 INIT_LIST_HEAD(&entity->links); 633 entity->num_links = 0; 634 entity->num_backlinks = 0; 635 636 ret = ida_alloc_min(&mdev->entity_internal_idx, 1, GFP_KERNEL); 637 if (ret < 0) 638 return ret; 639 entity->internal_idx = ret; 640 641 mutex_lock(&mdev->graph_mutex); 642 mdev->entity_internal_idx_max = 643 max(mdev->entity_internal_idx_max, entity->internal_idx); 644 645 /* Initialize media_gobj embedded at the entity */ 646 media_gobj_create(mdev, MEDIA_GRAPH_ENTITY, &entity->graph_obj); 647 648 /* Initialize objects at the pads */ 649 for (i = 0; i < entity->num_pads; i++) 650 media_gobj_create(mdev, MEDIA_GRAPH_PAD, 651 &entity->pads[i].graph_obj); 652 653 /* invoke entity_notify callbacks */ 654 list_for_each_entry_safe(notify, next, &mdev->entity_notify, list) 655 notify->notify(entity, notify->notify_data); 656 657 if (mdev->entity_internal_idx_max 658 >= mdev->pm_count_walk.ent_enum.idx_max) { 659 struct media_graph new = { .top = 0 }; 660 661 /* 662 * Initialise the new graph walk before cleaning up 663 * the old one in order not to spoil the graph walk 664 * object of the media device if graph walk init fails. 665 */ 666 ret = media_graph_walk_init(&new, mdev); 667 if (ret) { 668 __media_device_unregister_entity(entity); 669 mutex_unlock(&mdev->graph_mutex); 670 return ret; 671 } 672 media_graph_walk_cleanup(&mdev->pm_count_walk); 673 mdev->pm_count_walk = new; 674 } 675 mutex_unlock(&mdev->graph_mutex); 676 677 return 0; 678 } 679 EXPORT_SYMBOL_GPL(media_device_register_entity); 680 681 void media_device_unregister_entity(struct media_entity *entity) 682 { 683 struct media_device *mdev = entity->graph_obj.mdev; 684 685 if (mdev == NULL) 686 return; 687 688 mutex_lock(&mdev->graph_mutex); 689 __media_device_unregister_entity(entity); 690 mutex_unlock(&mdev->graph_mutex); 691 } 692 EXPORT_SYMBOL_GPL(media_device_unregister_entity); 693 694 /** 695 * media_device_init() - initialize a media device 696 * @mdev: The media device 697 * 698 * The caller is responsible for initializing the media device before 699 * registration. The following fields must be set: 700 * 701 * - dev must point to the parent device 702 * - model must be filled with the device model name 703 */ 704 void media_device_init(struct media_device *mdev) 705 { 706 INIT_LIST_HEAD(&mdev->entities); 707 INIT_LIST_HEAD(&mdev->interfaces); 708 INIT_LIST_HEAD(&mdev->pads); 709 INIT_LIST_HEAD(&mdev->links); 710 INIT_LIST_HEAD(&mdev->entity_notify); 711 712 mutex_init(&mdev->req_queue_mutex); 713 mutex_init(&mdev->graph_mutex); 714 ida_init(&mdev->entity_internal_idx); 715 716 atomic_set(&mdev->request_id, 0); 717 718 dev_dbg(mdev->dev, "Media device initialized\n"); 719 } 720 EXPORT_SYMBOL_GPL(media_device_init); 721 722 void media_device_cleanup(struct media_device *mdev) 723 { 724 ida_destroy(&mdev->entity_internal_idx); 725 mdev->entity_internal_idx_max = 0; 726 media_graph_walk_cleanup(&mdev->pm_count_walk); 727 mutex_destroy(&mdev->graph_mutex); 728 mutex_destroy(&mdev->req_queue_mutex); 729 } 730 EXPORT_SYMBOL_GPL(media_device_cleanup); 731 732 int __must_check __media_device_register(struct media_device *mdev, 733 struct module *owner) 734 { 735 struct media_devnode *devnode; 736 int ret; 737 738 devnode = kzalloc(sizeof(*devnode), GFP_KERNEL); 739 if (!devnode) 740 return -ENOMEM; 741 742 /* Register the device node. */ 743 mdev->devnode = devnode; 744 devnode->fops = &media_device_fops; 745 devnode->parent = mdev->dev; 746 devnode->release = media_device_release; 747 748 /* Set version 0 to indicate user-space that the graph is static */ 749 mdev->topology_version = 0; 750 751 ret = media_devnode_register(mdev, devnode, owner); 752 if (ret < 0) { 753 /* devnode free is handled in media_devnode_*() */ 754 mdev->devnode = NULL; 755 return ret; 756 } 757 758 ret = device_create_file(&devnode->dev, &dev_attr_model); 759 if (ret < 0) { 760 /* devnode free is handled in media_devnode_*() */ 761 mdev->devnode = NULL; 762 media_devnode_unregister_prepare(devnode); 763 media_devnode_unregister(devnode); 764 return ret; 765 } 766 767 dev_dbg(mdev->dev, "Media device registered\n"); 768 769 return 0; 770 } 771 EXPORT_SYMBOL_GPL(__media_device_register); 772 773 int __must_check media_device_register_entity_notify(struct media_device *mdev, 774 struct media_entity_notify *nptr) 775 { 776 mutex_lock(&mdev->graph_mutex); 777 list_add_tail(&nptr->list, &mdev->entity_notify); 778 mutex_unlock(&mdev->graph_mutex); 779 return 0; 780 } 781 EXPORT_SYMBOL_GPL(media_device_register_entity_notify); 782 783 /* 784 * Note: Should be called with mdev->lock held. 785 */ 786 static void __media_device_unregister_entity_notify(struct media_device *mdev, 787 struct media_entity_notify *nptr) 788 { 789 list_del(&nptr->list); 790 } 791 792 void media_device_unregister_entity_notify(struct media_device *mdev, 793 struct media_entity_notify *nptr) 794 { 795 mutex_lock(&mdev->graph_mutex); 796 __media_device_unregister_entity_notify(mdev, nptr); 797 mutex_unlock(&mdev->graph_mutex); 798 } 799 EXPORT_SYMBOL_GPL(media_device_unregister_entity_notify); 800 801 void media_device_unregister(struct media_device *mdev) 802 { 803 struct media_entity *entity; 804 struct media_entity *next; 805 struct media_interface *intf, *tmp_intf; 806 struct media_entity_notify *notify, *nextp; 807 808 if (mdev == NULL) 809 return; 810 811 mutex_lock(&mdev->graph_mutex); 812 813 /* Check if mdev was ever registered at all */ 814 if (!media_devnode_is_registered(mdev->devnode)) { 815 mutex_unlock(&mdev->graph_mutex); 816 return; 817 } 818 819 /* Clear the devnode register bit to avoid races with media dev open */ 820 media_devnode_unregister_prepare(mdev->devnode); 821 822 /* Remove all entities from the media device */ 823 list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list) 824 __media_device_unregister_entity(entity); 825 826 /* Remove all entity_notify callbacks from the media device */ 827 list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list) 828 __media_device_unregister_entity_notify(mdev, notify); 829 830 /* Remove all interfaces from the media device */ 831 list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces, 832 graph_obj.list) { 833 /* 834 * Unlink the interface, but don't free it here; the 835 * module which created it is responsible for freeing 836 * it 837 */ 838 __media_remove_intf_links(intf); 839 media_gobj_destroy(&intf->graph_obj); 840 } 841 842 mutex_unlock(&mdev->graph_mutex); 843 844 dev_dbg(mdev->dev, "Media device unregistered\n"); 845 846 device_remove_file(&mdev->devnode->dev, &dev_attr_model); 847 media_devnode_unregister(mdev->devnode); 848 /* devnode free is handled in media_devnode_*() */ 849 mdev->devnode = NULL; 850 } 851 EXPORT_SYMBOL_GPL(media_device_unregister); 852 853 #if IS_ENABLED(CONFIG_PCI) 854 void media_device_pci_init(struct media_device *mdev, 855 struct pci_dev *pci_dev, 856 const char *name) 857 { 858 mdev->dev = &pci_dev->dev; 859 860 if (name) 861 strscpy(mdev->model, name, sizeof(mdev->model)); 862 else 863 strscpy(mdev->model, pci_name(pci_dev), sizeof(mdev->model)); 864 865 sprintf(mdev->bus_info, "PCI:%s", pci_name(pci_dev)); 866 867 mdev->hw_revision = (pci_dev->subsystem_vendor << 16) 868 | pci_dev->subsystem_device; 869 870 media_device_init(mdev); 871 } 872 EXPORT_SYMBOL_GPL(media_device_pci_init); 873 #endif 874 875 #if IS_ENABLED(CONFIG_USB) 876 void __media_device_usb_init(struct media_device *mdev, 877 struct usb_device *udev, 878 const char *board_name, 879 const char *driver_name) 880 { 881 mdev->dev = &udev->dev; 882 883 if (driver_name) 884 strscpy(mdev->driver_name, driver_name, 885 sizeof(mdev->driver_name)); 886 887 if (board_name) 888 strscpy(mdev->model, board_name, sizeof(mdev->model)); 889 else if (udev->product) 890 strscpy(mdev->model, udev->product, sizeof(mdev->model)); 891 else 892 strscpy(mdev->model, "unknown model", sizeof(mdev->model)); 893 if (udev->serial) 894 strscpy(mdev->serial, udev->serial, sizeof(mdev->serial)); 895 usb_make_path(udev, mdev->bus_info, sizeof(mdev->bus_info)); 896 mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice); 897 898 media_device_init(mdev); 899 } 900 EXPORT_SYMBOL_GPL(__media_device_usb_init); 901 #endif 902 903 904 #endif /* CONFIG_MEDIA_CONTROLLER */ 905