1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Media entity 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/bitmap.h> 12 #include <linux/property.h> 13 #include <linux/slab.h> 14 #include <media/media-entity.h> 15 #include <media/media-device.h> 16 17 static inline const char *intf_type(struct media_interface *intf) 18 { 19 switch (intf->type) { 20 case MEDIA_INTF_T_DVB_FE: 21 return "dvb-frontend"; 22 case MEDIA_INTF_T_DVB_DEMUX: 23 return "dvb-demux"; 24 case MEDIA_INTF_T_DVB_DVR: 25 return "dvb-dvr"; 26 case MEDIA_INTF_T_DVB_CA: 27 return "dvb-ca"; 28 case MEDIA_INTF_T_DVB_NET: 29 return "dvb-net"; 30 case MEDIA_INTF_T_V4L_VIDEO: 31 return "v4l-video"; 32 case MEDIA_INTF_T_V4L_VBI: 33 return "v4l-vbi"; 34 case MEDIA_INTF_T_V4L_RADIO: 35 return "v4l-radio"; 36 case MEDIA_INTF_T_V4L_SUBDEV: 37 return "v4l-subdev"; 38 case MEDIA_INTF_T_V4L_SWRADIO: 39 return "v4l-swradio"; 40 case MEDIA_INTF_T_V4L_TOUCH: 41 return "v4l-touch"; 42 default: 43 return "unknown-intf"; 44 } 45 }; 46 47 __must_check int __media_entity_enum_init(struct media_entity_enum *ent_enum, 48 int idx_max) 49 { 50 idx_max = ALIGN(idx_max, BITS_PER_LONG); 51 ent_enum->bmap = bitmap_zalloc(idx_max, GFP_KERNEL); 52 if (!ent_enum->bmap) 53 return -ENOMEM; 54 55 ent_enum->idx_max = idx_max; 56 57 return 0; 58 } 59 EXPORT_SYMBOL_GPL(__media_entity_enum_init); 60 61 void media_entity_enum_cleanup(struct media_entity_enum *ent_enum) 62 { 63 bitmap_free(ent_enum->bmap); 64 } 65 EXPORT_SYMBOL_GPL(media_entity_enum_cleanup); 66 67 /** 68 * dev_dbg_obj - Prints in debug mode a change on some object 69 * 70 * @event_name: Name of the event to report. Could be __func__ 71 * @gobj: Pointer to the object 72 * 73 * Enabled only if DEBUG or CONFIG_DYNAMIC_DEBUG. Otherwise, it 74 * won't produce any code. 75 */ 76 static void dev_dbg_obj(const char *event_name, struct media_gobj *gobj) 77 { 78 #if defined(DEBUG) || defined (CONFIG_DYNAMIC_DEBUG) 79 switch (media_type(gobj)) { 80 case MEDIA_GRAPH_ENTITY: 81 dev_dbg(gobj->mdev->dev, 82 "%s id %u: entity '%s'\n", 83 event_name, media_id(gobj), 84 gobj_to_entity(gobj)->name); 85 break; 86 case MEDIA_GRAPH_LINK: 87 { 88 struct media_link *link = gobj_to_link(gobj); 89 90 dev_dbg(gobj->mdev->dev, 91 "%s id %u: %s link id %u ==> id %u\n", 92 event_name, media_id(gobj), 93 media_type(link->gobj0) == MEDIA_GRAPH_PAD ? 94 "data" : "interface", 95 media_id(link->gobj0), 96 media_id(link->gobj1)); 97 break; 98 } 99 case MEDIA_GRAPH_PAD: 100 { 101 struct media_pad *pad = gobj_to_pad(gobj); 102 103 dev_dbg(gobj->mdev->dev, 104 "%s id %u: %s%spad '%s':%d\n", 105 event_name, media_id(gobj), 106 pad->flags & MEDIA_PAD_FL_SINK ? "sink " : "", 107 pad->flags & MEDIA_PAD_FL_SOURCE ? "source " : "", 108 pad->entity->name, pad->index); 109 break; 110 } 111 case MEDIA_GRAPH_INTF_DEVNODE: 112 { 113 struct media_interface *intf = gobj_to_intf(gobj); 114 struct media_intf_devnode *devnode = intf_to_devnode(intf); 115 116 dev_dbg(gobj->mdev->dev, 117 "%s id %u: intf_devnode %s - major: %d, minor: %d\n", 118 event_name, media_id(gobj), 119 intf_type(intf), 120 devnode->major, devnode->minor); 121 break; 122 } 123 } 124 #endif 125 } 126 127 void media_gobj_create(struct media_device *mdev, 128 enum media_gobj_type type, 129 struct media_gobj *gobj) 130 { 131 BUG_ON(!mdev); 132 133 gobj->mdev = mdev; 134 135 /* Create a per-type unique object ID */ 136 gobj->id = media_gobj_gen_id(type, ++mdev->id); 137 138 switch (type) { 139 case MEDIA_GRAPH_ENTITY: 140 list_add_tail(&gobj->list, &mdev->entities); 141 break; 142 case MEDIA_GRAPH_PAD: 143 list_add_tail(&gobj->list, &mdev->pads); 144 break; 145 case MEDIA_GRAPH_LINK: 146 list_add_tail(&gobj->list, &mdev->links); 147 break; 148 case MEDIA_GRAPH_INTF_DEVNODE: 149 list_add_tail(&gobj->list, &mdev->interfaces); 150 break; 151 } 152 153 mdev->topology_version++; 154 155 dev_dbg_obj(__func__, gobj); 156 } 157 158 void media_gobj_destroy(struct media_gobj *gobj) 159 { 160 /* Do nothing if the object is not linked. */ 161 if (gobj->mdev == NULL) 162 return; 163 164 dev_dbg_obj(__func__, gobj); 165 166 gobj->mdev->topology_version++; 167 168 /* Remove the object from mdev list */ 169 list_del(&gobj->list); 170 171 gobj->mdev = NULL; 172 } 173 174 /* 175 * TODO: Get rid of this. 176 */ 177 #define MEDIA_ENTITY_MAX_PADS 512 178 179 int media_entity_pads_init(struct media_entity *entity, u16 num_pads, 180 struct media_pad *pads) 181 { 182 struct media_device *mdev = entity->graph_obj.mdev; 183 unsigned int i; 184 185 if (num_pads >= MEDIA_ENTITY_MAX_PADS) 186 return -E2BIG; 187 188 entity->num_pads = num_pads; 189 entity->pads = pads; 190 191 if (mdev) 192 mutex_lock(&mdev->graph_mutex); 193 194 for (i = 0; i < num_pads; i++) { 195 pads[i].entity = entity; 196 pads[i].index = i; 197 if (mdev) 198 media_gobj_create(mdev, MEDIA_GRAPH_PAD, 199 &entity->pads[i].graph_obj); 200 } 201 202 if (mdev) 203 mutex_unlock(&mdev->graph_mutex); 204 205 return 0; 206 } 207 EXPORT_SYMBOL_GPL(media_entity_pads_init); 208 209 /* ----------------------------------------------------------------------------- 210 * Graph traversal 211 */ 212 213 static struct media_entity * 214 media_entity_other(struct media_entity *entity, struct media_link *link) 215 { 216 if (link->source->entity == entity) 217 return link->sink->entity; 218 else 219 return link->source->entity; 220 } 221 222 /* push an entity to traversal stack */ 223 static void stack_push(struct media_graph *graph, 224 struct media_entity *entity) 225 { 226 if (graph->top == MEDIA_ENTITY_ENUM_MAX_DEPTH - 1) { 227 WARN_ON(1); 228 return; 229 } 230 graph->top++; 231 graph->stack[graph->top].link = entity->links.next; 232 graph->stack[graph->top].entity = entity; 233 } 234 235 static struct media_entity *stack_pop(struct media_graph *graph) 236 { 237 struct media_entity *entity; 238 239 entity = graph->stack[graph->top].entity; 240 graph->top--; 241 242 return entity; 243 } 244 245 #define link_top(en) ((en)->stack[(en)->top].link) 246 #define stack_top(en) ((en)->stack[(en)->top].entity) 247 248 /** 249 * media_graph_walk_init - Allocate resources for graph walk 250 * @graph: Media graph structure that will be used to walk the graph 251 * @mdev: Media device 252 * 253 * Reserve resources for graph walk in media device's current 254 * state. The memory must be released using 255 * media_graph_walk_free(). 256 * 257 * Returns error on failure, zero on success. 258 */ 259 __must_check int media_graph_walk_init( 260 struct media_graph *graph, struct media_device *mdev) 261 { 262 return media_entity_enum_init(&graph->ent_enum, mdev); 263 } 264 EXPORT_SYMBOL_GPL(media_graph_walk_init); 265 266 /** 267 * media_graph_walk_cleanup - Release resources related to graph walking 268 * @graph: Media graph structure that was used to walk the graph 269 */ 270 void media_graph_walk_cleanup(struct media_graph *graph) 271 { 272 media_entity_enum_cleanup(&graph->ent_enum); 273 } 274 EXPORT_SYMBOL_GPL(media_graph_walk_cleanup); 275 276 void media_graph_walk_start(struct media_graph *graph, 277 struct media_entity *entity) 278 { 279 media_entity_enum_zero(&graph->ent_enum); 280 media_entity_enum_set(&graph->ent_enum, entity); 281 282 graph->top = 0; 283 graph->stack[graph->top].entity = NULL; 284 stack_push(graph, entity); 285 dev_dbg(entity->graph_obj.mdev->dev, 286 "begin graph walk at '%s'\n", entity->name); 287 } 288 EXPORT_SYMBOL_GPL(media_graph_walk_start); 289 290 static void media_graph_walk_iter(struct media_graph *graph) 291 { 292 struct media_entity *entity = stack_top(graph); 293 struct media_link *link; 294 struct media_entity *next; 295 296 link = list_entry(link_top(graph), typeof(*link), list); 297 298 /* The link is not enabled so we do not follow. */ 299 if (!(link->flags & MEDIA_LNK_FL_ENABLED)) { 300 link_top(graph) = link_top(graph)->next; 301 dev_dbg(entity->graph_obj.mdev->dev, 302 "walk: skipping disabled link '%s':%u -> '%s':%u\n", 303 link->source->entity->name, link->source->index, 304 link->sink->entity->name, link->sink->index); 305 return; 306 } 307 308 /* Get the entity at the other end of the link. */ 309 next = media_entity_other(entity, link); 310 311 /* Has the entity already been visited? */ 312 if (media_entity_enum_test_and_set(&graph->ent_enum, next)) { 313 link_top(graph) = link_top(graph)->next; 314 dev_dbg(entity->graph_obj.mdev->dev, 315 "walk: skipping entity '%s' (already seen)\n", 316 next->name); 317 return; 318 } 319 320 /* Push the new entity to stack and start over. */ 321 link_top(graph) = link_top(graph)->next; 322 stack_push(graph, next); 323 dev_dbg(entity->graph_obj.mdev->dev, "walk: pushing '%s' on stack\n", 324 next->name); 325 lockdep_assert_held(&entity->graph_obj.mdev->graph_mutex); 326 } 327 328 struct media_entity *media_graph_walk_next(struct media_graph *graph) 329 { 330 struct media_entity *entity; 331 332 if (stack_top(graph) == NULL) 333 return NULL; 334 335 /* 336 * Depth first search. Push entity to stack and continue from 337 * top of the stack until no more entities on the level can be 338 * found. 339 */ 340 while (link_top(graph) != &stack_top(graph)->links) 341 media_graph_walk_iter(graph); 342 343 entity = stack_pop(graph); 344 dev_dbg(entity->graph_obj.mdev->dev, 345 "walk: returning entity '%s'\n", entity->name); 346 347 return entity; 348 } 349 EXPORT_SYMBOL_GPL(media_graph_walk_next); 350 351 int media_entity_get_fwnode_pad(struct media_entity *entity, 352 struct fwnode_handle *fwnode, 353 unsigned long direction_flags) 354 { 355 struct fwnode_endpoint endpoint; 356 unsigned int i; 357 int ret; 358 359 if (!entity->ops || !entity->ops->get_fwnode_pad) { 360 for (i = 0; i < entity->num_pads; i++) { 361 if (entity->pads[i].flags & direction_flags) 362 return i; 363 } 364 365 return -ENXIO; 366 } 367 368 ret = fwnode_graph_parse_endpoint(fwnode, &endpoint); 369 if (ret) 370 return ret; 371 372 ret = entity->ops->get_fwnode_pad(entity, &endpoint); 373 if (ret < 0) 374 return ret; 375 376 if (ret >= entity->num_pads) 377 return -ENXIO; 378 379 if (!(entity->pads[ret].flags & direction_flags)) 380 return -ENXIO; 381 382 return ret; 383 } 384 EXPORT_SYMBOL_GPL(media_entity_get_fwnode_pad); 385 386 /* ----------------------------------------------------------------------------- 387 * Pipeline management 388 */ 389 390 __must_check int __media_pipeline_start(struct media_entity *entity, 391 struct media_pipeline *pipe) 392 { 393 struct media_device *mdev = entity->graph_obj.mdev; 394 struct media_graph *graph = &pipe->graph; 395 struct media_entity *entity_err = entity; 396 struct media_link *link; 397 int ret; 398 399 if (pipe->streaming_count) { 400 pipe->streaming_count++; 401 return 0; 402 } 403 404 ret = media_graph_walk_init(&pipe->graph, mdev); 405 if (ret) 406 return ret; 407 408 media_graph_walk_start(&pipe->graph, entity); 409 410 while ((entity = media_graph_walk_next(graph))) { 411 DECLARE_BITMAP(active, MEDIA_ENTITY_MAX_PADS); 412 DECLARE_BITMAP(has_no_links, MEDIA_ENTITY_MAX_PADS); 413 414 if (entity->pipe && entity->pipe != pipe) { 415 pr_err("Pipe active for %s. Can't start for %s\n", 416 entity->name, 417 entity_err->name); 418 ret = -EBUSY; 419 goto error; 420 } 421 422 /* Already streaming --- no need to check. */ 423 if (entity->pipe) 424 continue; 425 426 entity->pipe = pipe; 427 428 if (!entity->ops || !entity->ops->link_validate) 429 continue; 430 431 bitmap_zero(active, entity->num_pads); 432 bitmap_fill(has_no_links, entity->num_pads); 433 434 list_for_each_entry(link, &entity->links, list) { 435 struct media_pad *pad = link->sink->entity == entity 436 ? link->sink : link->source; 437 438 /* Mark that a pad is connected by a link. */ 439 bitmap_clear(has_no_links, pad->index, 1); 440 441 /* 442 * Pads that either do not need to connect or 443 * are connected through an enabled link are 444 * fine. 445 */ 446 if (!(pad->flags & MEDIA_PAD_FL_MUST_CONNECT) || 447 link->flags & MEDIA_LNK_FL_ENABLED) 448 bitmap_set(active, pad->index, 1); 449 450 /* 451 * Link validation will only take place for 452 * sink ends of the link that are enabled. 453 */ 454 if (link->sink != pad || 455 !(link->flags & MEDIA_LNK_FL_ENABLED)) 456 continue; 457 458 ret = entity->ops->link_validate(link); 459 if (ret < 0 && ret != -ENOIOCTLCMD) { 460 dev_dbg(entity->graph_obj.mdev->dev, 461 "link validation failed for '%s':%u -> '%s':%u, error %d\n", 462 link->source->entity->name, 463 link->source->index, 464 entity->name, link->sink->index, ret); 465 goto error; 466 } 467 } 468 469 /* Either no links or validated links are fine. */ 470 bitmap_or(active, active, has_no_links, entity->num_pads); 471 472 if (!bitmap_full(active, entity->num_pads)) { 473 ret = -ENOLINK; 474 dev_dbg(entity->graph_obj.mdev->dev, 475 "'%s':%u must be connected by an enabled link\n", 476 entity->name, 477 (unsigned)find_first_zero_bit( 478 active, entity->num_pads)); 479 goto error; 480 } 481 } 482 483 pipe->streaming_count++; 484 485 return 0; 486 487 error: 488 /* 489 * Link validation on graph failed. We revert what we did and 490 * return the error. 491 */ 492 media_graph_walk_start(graph, entity_err); 493 494 while ((entity_err = media_graph_walk_next(graph))) { 495 entity_err->pipe = NULL; 496 497 /* 498 * We haven't started entities further than this so we quit 499 * here. 500 */ 501 if (entity_err == entity) 502 break; 503 } 504 505 media_graph_walk_cleanup(graph); 506 507 return ret; 508 } 509 EXPORT_SYMBOL_GPL(__media_pipeline_start); 510 511 __must_check int media_pipeline_start(struct media_entity *entity, 512 struct media_pipeline *pipe) 513 { 514 struct media_device *mdev = entity->graph_obj.mdev; 515 int ret; 516 517 mutex_lock(&mdev->graph_mutex); 518 ret = __media_pipeline_start(entity, pipe); 519 mutex_unlock(&mdev->graph_mutex); 520 return ret; 521 } 522 EXPORT_SYMBOL_GPL(media_pipeline_start); 523 524 void __media_pipeline_stop(struct media_entity *entity) 525 { 526 struct media_graph *graph = &entity->pipe->graph; 527 struct media_pipeline *pipe = entity->pipe; 528 529 /* 530 * If the following check fails, the driver has performed an 531 * unbalanced call to media_pipeline_stop() 532 */ 533 if (WARN_ON(!pipe)) 534 return; 535 536 if (--pipe->streaming_count) 537 return; 538 539 media_graph_walk_start(graph, entity); 540 541 while ((entity = media_graph_walk_next(graph))) 542 entity->pipe = NULL; 543 544 media_graph_walk_cleanup(graph); 545 546 } 547 EXPORT_SYMBOL_GPL(__media_pipeline_stop); 548 549 void media_pipeline_stop(struct media_entity *entity) 550 { 551 struct media_device *mdev = entity->graph_obj.mdev; 552 553 mutex_lock(&mdev->graph_mutex); 554 __media_pipeline_stop(entity); 555 mutex_unlock(&mdev->graph_mutex); 556 } 557 EXPORT_SYMBOL_GPL(media_pipeline_stop); 558 559 /* ----------------------------------------------------------------------------- 560 * Links management 561 */ 562 563 static struct media_link *media_add_link(struct list_head *head) 564 { 565 struct media_link *link; 566 567 link = kzalloc(sizeof(*link), GFP_KERNEL); 568 if (link == NULL) 569 return NULL; 570 571 list_add_tail(&link->list, head); 572 573 return link; 574 } 575 576 static void __media_entity_remove_link(struct media_entity *entity, 577 struct media_link *link) 578 { 579 struct media_link *rlink, *tmp; 580 struct media_entity *remote; 581 582 if (link->source->entity == entity) 583 remote = link->sink->entity; 584 else 585 remote = link->source->entity; 586 587 list_for_each_entry_safe(rlink, tmp, &remote->links, list) { 588 if (rlink != link->reverse) 589 continue; 590 591 if (link->source->entity == entity) 592 remote->num_backlinks--; 593 594 /* Remove the remote link */ 595 list_del(&rlink->list); 596 media_gobj_destroy(&rlink->graph_obj); 597 kfree(rlink); 598 599 if (--remote->num_links == 0) 600 break; 601 } 602 list_del(&link->list); 603 media_gobj_destroy(&link->graph_obj); 604 kfree(link); 605 } 606 607 int media_get_pad_index(struct media_entity *entity, bool is_sink, 608 enum media_pad_signal_type sig_type) 609 { 610 int i; 611 bool pad_is_sink; 612 613 if (!entity) 614 return -EINVAL; 615 616 for (i = 0; i < entity->num_pads; i++) { 617 if (entity->pads[i].flags & MEDIA_PAD_FL_SINK) 618 pad_is_sink = true; 619 else if (entity->pads[i].flags & MEDIA_PAD_FL_SOURCE) 620 pad_is_sink = false; 621 else 622 continue; /* This is an error! */ 623 624 if (pad_is_sink != is_sink) 625 continue; 626 if (entity->pads[i].sig_type == sig_type) 627 return i; 628 } 629 return -EINVAL; 630 } 631 EXPORT_SYMBOL_GPL(media_get_pad_index); 632 633 int 634 media_create_pad_link(struct media_entity *source, u16 source_pad, 635 struct media_entity *sink, u16 sink_pad, u32 flags) 636 { 637 struct media_link *link; 638 struct media_link *backlink; 639 640 if (WARN_ON(!source || !sink) || 641 WARN_ON(source_pad >= source->num_pads) || 642 WARN_ON(sink_pad >= sink->num_pads)) 643 return -EINVAL; 644 if (WARN_ON(!(source->pads[source_pad].flags & MEDIA_PAD_FL_SOURCE))) 645 return -EINVAL; 646 if (WARN_ON(!(sink->pads[sink_pad].flags & MEDIA_PAD_FL_SINK))) 647 return -EINVAL; 648 649 link = media_add_link(&source->links); 650 if (link == NULL) 651 return -ENOMEM; 652 653 link->source = &source->pads[source_pad]; 654 link->sink = &sink->pads[sink_pad]; 655 link->flags = flags & ~MEDIA_LNK_FL_INTERFACE_LINK; 656 657 /* Initialize graph object embedded at the new link */ 658 media_gobj_create(source->graph_obj.mdev, MEDIA_GRAPH_LINK, 659 &link->graph_obj); 660 661 /* Create the backlink. Backlinks are used to help graph traversal and 662 * are not reported to userspace. 663 */ 664 backlink = media_add_link(&sink->links); 665 if (backlink == NULL) { 666 __media_entity_remove_link(source, link); 667 return -ENOMEM; 668 } 669 670 backlink->source = &source->pads[source_pad]; 671 backlink->sink = &sink->pads[sink_pad]; 672 backlink->flags = flags; 673 backlink->is_backlink = true; 674 675 /* Initialize graph object embedded at the new link */ 676 media_gobj_create(sink->graph_obj.mdev, MEDIA_GRAPH_LINK, 677 &backlink->graph_obj); 678 679 link->reverse = backlink; 680 backlink->reverse = link; 681 682 sink->num_backlinks++; 683 sink->num_links++; 684 source->num_links++; 685 686 return 0; 687 } 688 EXPORT_SYMBOL_GPL(media_create_pad_link); 689 690 int media_create_pad_links(const struct media_device *mdev, 691 const u32 source_function, 692 struct media_entity *source, 693 const u16 source_pad, 694 const u32 sink_function, 695 struct media_entity *sink, 696 const u16 sink_pad, 697 u32 flags, 698 const bool allow_both_undefined) 699 { 700 struct media_entity *entity; 701 unsigned function; 702 int ret; 703 704 /* Trivial case: 1:1 relation */ 705 if (source && sink) 706 return media_create_pad_link(source, source_pad, 707 sink, sink_pad, flags); 708 709 /* Worse case scenario: n:n relation */ 710 if (!source && !sink) { 711 if (!allow_both_undefined) 712 return 0; 713 media_device_for_each_entity(source, mdev) { 714 if (source->function != source_function) 715 continue; 716 media_device_for_each_entity(sink, mdev) { 717 if (sink->function != sink_function) 718 continue; 719 ret = media_create_pad_link(source, source_pad, 720 sink, sink_pad, 721 flags); 722 if (ret) 723 return ret; 724 flags &= ~(MEDIA_LNK_FL_ENABLED | 725 MEDIA_LNK_FL_IMMUTABLE); 726 } 727 } 728 return 0; 729 } 730 731 /* Handle 1:n and n:1 cases */ 732 if (source) 733 function = sink_function; 734 else 735 function = source_function; 736 737 media_device_for_each_entity(entity, mdev) { 738 if (entity->function != function) 739 continue; 740 741 if (source) 742 ret = media_create_pad_link(source, source_pad, 743 entity, sink_pad, flags); 744 else 745 ret = media_create_pad_link(entity, source_pad, 746 sink, sink_pad, flags); 747 if (ret) 748 return ret; 749 flags &= ~(MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE); 750 } 751 return 0; 752 } 753 EXPORT_SYMBOL_GPL(media_create_pad_links); 754 755 void __media_entity_remove_links(struct media_entity *entity) 756 { 757 struct media_link *link, *tmp; 758 759 list_for_each_entry_safe(link, tmp, &entity->links, list) 760 __media_entity_remove_link(entity, link); 761 762 entity->num_links = 0; 763 entity->num_backlinks = 0; 764 } 765 EXPORT_SYMBOL_GPL(__media_entity_remove_links); 766 767 void media_entity_remove_links(struct media_entity *entity) 768 { 769 struct media_device *mdev = entity->graph_obj.mdev; 770 771 /* Do nothing if the entity is not registered. */ 772 if (mdev == NULL) 773 return; 774 775 mutex_lock(&mdev->graph_mutex); 776 __media_entity_remove_links(entity); 777 mutex_unlock(&mdev->graph_mutex); 778 } 779 EXPORT_SYMBOL_GPL(media_entity_remove_links); 780 781 static int __media_entity_setup_link_notify(struct media_link *link, u32 flags) 782 { 783 int ret; 784 785 /* Notify both entities. */ 786 ret = media_entity_call(link->source->entity, link_setup, 787 link->source, link->sink, flags); 788 if (ret < 0 && ret != -ENOIOCTLCMD) 789 return ret; 790 791 ret = media_entity_call(link->sink->entity, link_setup, 792 link->sink, link->source, flags); 793 if (ret < 0 && ret != -ENOIOCTLCMD) { 794 media_entity_call(link->source->entity, link_setup, 795 link->source, link->sink, link->flags); 796 return ret; 797 } 798 799 link->flags = flags; 800 link->reverse->flags = link->flags; 801 802 return 0; 803 } 804 805 int __media_entity_setup_link(struct media_link *link, u32 flags) 806 { 807 const u32 mask = MEDIA_LNK_FL_ENABLED; 808 struct media_device *mdev; 809 struct media_entity *source, *sink; 810 int ret = -EBUSY; 811 812 if (link == NULL) 813 return -EINVAL; 814 815 /* The non-modifiable link flags must not be modified. */ 816 if ((link->flags & ~mask) != (flags & ~mask)) 817 return -EINVAL; 818 819 if (link->flags & MEDIA_LNK_FL_IMMUTABLE) 820 return link->flags == flags ? 0 : -EINVAL; 821 822 if (link->flags == flags) 823 return 0; 824 825 source = link->source->entity; 826 sink = link->sink->entity; 827 828 if (!(link->flags & MEDIA_LNK_FL_DYNAMIC) && 829 (media_entity_is_streaming(source) || 830 media_entity_is_streaming(sink))) 831 return -EBUSY; 832 833 mdev = source->graph_obj.mdev; 834 835 if (mdev->ops && mdev->ops->link_notify) { 836 ret = mdev->ops->link_notify(link, flags, 837 MEDIA_DEV_NOTIFY_PRE_LINK_CH); 838 if (ret < 0) 839 return ret; 840 } 841 842 ret = __media_entity_setup_link_notify(link, flags); 843 844 if (mdev->ops && mdev->ops->link_notify) 845 mdev->ops->link_notify(link, flags, 846 MEDIA_DEV_NOTIFY_POST_LINK_CH); 847 848 return ret; 849 } 850 EXPORT_SYMBOL_GPL(__media_entity_setup_link); 851 852 int media_entity_setup_link(struct media_link *link, u32 flags) 853 { 854 int ret; 855 856 mutex_lock(&link->graph_obj.mdev->graph_mutex); 857 ret = __media_entity_setup_link(link, flags); 858 mutex_unlock(&link->graph_obj.mdev->graph_mutex); 859 860 return ret; 861 } 862 EXPORT_SYMBOL_GPL(media_entity_setup_link); 863 864 struct media_link * 865 media_entity_find_link(struct media_pad *source, struct media_pad *sink) 866 { 867 struct media_link *link; 868 869 list_for_each_entry(link, &source->entity->links, list) { 870 if (link->source->entity == source->entity && 871 link->source->index == source->index && 872 link->sink->entity == sink->entity && 873 link->sink->index == sink->index) 874 return link; 875 } 876 877 return NULL; 878 } 879 EXPORT_SYMBOL_GPL(media_entity_find_link); 880 881 struct media_pad *media_entity_remote_pad(const struct media_pad *pad) 882 { 883 struct media_link *link; 884 885 list_for_each_entry(link, &pad->entity->links, list) { 886 if (!(link->flags & MEDIA_LNK_FL_ENABLED)) 887 continue; 888 889 if (link->source == pad) 890 return link->sink; 891 892 if (link->sink == pad) 893 return link->source; 894 } 895 896 return NULL; 897 898 } 899 EXPORT_SYMBOL_GPL(media_entity_remote_pad); 900 901 static void media_interface_init(struct media_device *mdev, 902 struct media_interface *intf, 903 u32 gobj_type, 904 u32 intf_type, u32 flags) 905 { 906 intf->type = intf_type; 907 intf->flags = flags; 908 INIT_LIST_HEAD(&intf->links); 909 910 media_gobj_create(mdev, gobj_type, &intf->graph_obj); 911 } 912 913 /* Functions related to the media interface via device nodes */ 914 915 struct media_intf_devnode *media_devnode_create(struct media_device *mdev, 916 u32 type, u32 flags, 917 u32 major, u32 minor) 918 { 919 struct media_intf_devnode *devnode; 920 921 devnode = kzalloc(sizeof(*devnode), GFP_KERNEL); 922 if (!devnode) 923 return NULL; 924 925 devnode->major = major; 926 devnode->minor = minor; 927 928 media_interface_init(mdev, &devnode->intf, MEDIA_GRAPH_INTF_DEVNODE, 929 type, flags); 930 931 return devnode; 932 } 933 EXPORT_SYMBOL_GPL(media_devnode_create); 934 935 void media_devnode_remove(struct media_intf_devnode *devnode) 936 { 937 media_remove_intf_links(&devnode->intf); 938 media_gobj_destroy(&devnode->intf.graph_obj); 939 kfree(devnode); 940 } 941 EXPORT_SYMBOL_GPL(media_devnode_remove); 942 943 struct media_link *media_create_intf_link(struct media_entity *entity, 944 struct media_interface *intf, 945 u32 flags) 946 { 947 struct media_link *link; 948 949 link = media_add_link(&intf->links); 950 if (link == NULL) 951 return NULL; 952 953 link->intf = intf; 954 link->entity = entity; 955 link->flags = flags | MEDIA_LNK_FL_INTERFACE_LINK; 956 957 /* Initialize graph object embedded at the new link */ 958 media_gobj_create(intf->graph_obj.mdev, MEDIA_GRAPH_LINK, 959 &link->graph_obj); 960 961 return link; 962 } 963 EXPORT_SYMBOL_GPL(media_create_intf_link); 964 965 void __media_remove_intf_link(struct media_link *link) 966 { 967 list_del(&link->list); 968 media_gobj_destroy(&link->graph_obj); 969 kfree(link); 970 } 971 EXPORT_SYMBOL_GPL(__media_remove_intf_link); 972 973 void media_remove_intf_link(struct media_link *link) 974 { 975 struct media_device *mdev = link->graph_obj.mdev; 976 977 /* Do nothing if the intf is not registered. */ 978 if (mdev == NULL) 979 return; 980 981 mutex_lock(&mdev->graph_mutex); 982 __media_remove_intf_link(link); 983 mutex_unlock(&mdev->graph_mutex); 984 } 985 EXPORT_SYMBOL_GPL(media_remove_intf_link); 986 987 void __media_remove_intf_links(struct media_interface *intf) 988 { 989 struct media_link *link, *tmp; 990 991 list_for_each_entry_safe(link, tmp, &intf->links, list) 992 __media_remove_intf_link(link); 993 994 } 995 EXPORT_SYMBOL_GPL(__media_remove_intf_links); 996 997 void media_remove_intf_links(struct media_interface *intf) 998 { 999 struct media_device *mdev = intf->graph_obj.mdev; 1000 1001 /* Do nothing if the intf is not registered. */ 1002 if (mdev == NULL) 1003 return; 1004 1005 mutex_lock(&mdev->graph_mutex); 1006 __media_remove_intf_links(intf); 1007 mutex_unlock(&mdev->graph_mutex); 1008 } 1009 EXPORT_SYMBOL_GPL(media_remove_intf_links); 1010