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Linux 4.14.51
[linux/fpc-iii.git] / drivers / media / media-entity.c
blob2ace0410d277c373853ec2fcb58edb30b8bcfc0c
1 /*
2 * Media entity
3 *
4 * Copyright (C) 2010 Nokia Corporation
5 *
6 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
7 * Sakari Ailus <sakari.ailus@iki.fi>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18
19 #include <linux/bitmap.h>
20 #include <linux/module.h>
21 #include <linux/property.h>
22 #include <linux/slab.h>
23 #include <media/media-entity.h>
24 #include <media/media-device.h>
25
26 static inline const char *gobj_type(enum media_gobj_type type)
27 {
28 switch (type) {
29 case MEDIA_GRAPH_ENTITY:
30 return "entity";
31 case MEDIA_GRAPH_PAD:
32 return "pad";
33 case MEDIA_GRAPH_LINK:
34 return "link";
35 case MEDIA_GRAPH_INTF_DEVNODE:
36 return "intf-devnode";
37 default:
38 return "unknown";
39 }
40 }
41
42 static inline const char *intf_type(struct media_interface *intf)
43 {
44 switch (intf->type) {
45 case MEDIA_INTF_T_DVB_FE:
46 return "dvb-frontend";
47 case MEDIA_INTF_T_DVB_DEMUX:
48 return "dvb-demux";
49 case MEDIA_INTF_T_DVB_DVR:
50 return "dvb-dvr";
51 case MEDIA_INTF_T_DVB_CA:
52 return "dvb-ca";
53 case MEDIA_INTF_T_DVB_NET:
54 return "dvb-net";
55 case MEDIA_INTF_T_V4L_VIDEO:
56 return "v4l-video";
57 case MEDIA_INTF_T_V4L_VBI:
58 return "v4l-vbi";
59 case MEDIA_INTF_T_V4L_RADIO:
60 return "v4l-radio";
61 case MEDIA_INTF_T_V4L_SUBDEV:
62 return "v4l-subdev";
63 case MEDIA_INTF_T_V4L_SWRADIO:
64 return "v4l-swradio";
65 case MEDIA_INTF_T_V4L_TOUCH:
66 return "v4l-touch";
67 case MEDIA_INTF_T_ALSA_PCM_CAPTURE:
68 return "alsa-pcm-capture";
69 case MEDIA_INTF_T_ALSA_PCM_PLAYBACK:
70 return "alsa-pcm-playback";
71 case MEDIA_INTF_T_ALSA_CONTROL:
72 return "alsa-control";
73 case MEDIA_INTF_T_ALSA_COMPRESS:
74 return "alsa-compress";
75 case MEDIA_INTF_T_ALSA_RAWMIDI:
76 return "alsa-rawmidi";
77 case MEDIA_INTF_T_ALSA_HWDEP:
78 return "alsa-hwdep";
79 case MEDIA_INTF_T_ALSA_SEQUENCER:
80 return "alsa-sequencer";
81 case MEDIA_INTF_T_ALSA_TIMER:
82 return "alsa-timer";
83 default:
84 return "unknown-intf";
85 }
86 };
87
88 __must_check int __media_entity_enum_init(struct media_entity_enum *ent_enum,
89 int idx_max)
90 {
91 idx_max = ALIGN(idx_max, BITS_PER_LONG);
92 ent_enum->bmap = kcalloc(idx_max / BITS_PER_LONG, sizeof(long),
93 GFP_KERNEL);
94 if (!ent_enum->bmap)
95 return -ENOMEM;
96
97 bitmap_zero(ent_enum->bmap, idx_max);
98 ent_enum->idx_max = idx_max;
99
100 return 0;
101 }
102 EXPORT_SYMBOL_GPL(__media_entity_enum_init);
103
104 void media_entity_enum_cleanup(struct media_entity_enum *ent_enum)
105 {
106 kfree(ent_enum->bmap);
107 }
108 EXPORT_SYMBOL_GPL(media_entity_enum_cleanup);
109
110 /**
111 * dev_dbg_obj - Prints in debug mode a change on some object
112 *
113 * @event_name: Name of the event to report. Could be __func__
114 * @gobj: Pointer to the object
115 *
116 * Enabled only if DEBUG or CONFIG_DYNAMIC_DEBUG. Otherwise, it
117 * won't produce any code.
118 */
119 static void dev_dbg_obj(const char *event_name, struct media_gobj *gobj)
120 {
121 #if defined(DEBUG) || defined (CONFIG_DYNAMIC_DEBUG)
122 switch (media_type(gobj)) {
123 case MEDIA_GRAPH_ENTITY:
124 dev_dbg(gobj->mdev->dev,
125 "%s id %u: entity '%s'\n",
126 event_name, media_id(gobj),
127 gobj_to_entity(gobj)->name);
128 break;
129 case MEDIA_GRAPH_LINK:
130 {
131 struct media_link *link = gobj_to_link(gobj);
132
133 dev_dbg(gobj->mdev->dev,
134 "%s id %u: %s link id %u ==> id %u\n",
135 event_name, media_id(gobj),
136 media_type(link->gobj0) == MEDIA_GRAPH_PAD ?
137 "data" : "interface",
138 media_id(link->gobj0),
139 media_id(link->gobj1));
140 break;
141 }
142 case MEDIA_GRAPH_PAD:
143 {
144 struct media_pad *pad = gobj_to_pad(gobj);
145
146 dev_dbg(gobj->mdev->dev,
147 "%s id %u: %s%spad '%s':%d\n",
148 event_name, media_id(gobj),
149 pad->flags & MEDIA_PAD_FL_SINK ? "sink " : "",
150 pad->flags & MEDIA_PAD_FL_SOURCE ? "source " : "",
151 pad->entity->name, pad->index);
152 break;
153 }
154 case MEDIA_GRAPH_INTF_DEVNODE:
155 {
156 struct media_interface *intf = gobj_to_intf(gobj);
157 struct media_intf_devnode *devnode = intf_to_devnode(intf);
158
159 dev_dbg(gobj->mdev->dev,
160 "%s id %u: intf_devnode %s - major: %d, minor: %d\n",
161 event_name, media_id(gobj),
162 intf_type(intf),
163 devnode->major, devnode->minor);
164 break;
165 }
166 }
167 #endif
168 }
169
170 void media_gobj_create(struct media_device *mdev,
171 enum media_gobj_type type,
172 struct media_gobj *gobj)
173 {
174 BUG_ON(!mdev);
175
176 gobj->mdev = mdev;
177
178 /* Create a per-type unique object ID */
179 gobj->id = media_gobj_gen_id(type, ++mdev->id);
180
181 switch (type) {
182 case MEDIA_GRAPH_ENTITY:
183 list_add_tail(&gobj->list, &mdev->entities);
184 break;
185 case MEDIA_GRAPH_PAD:
186 list_add_tail(&gobj->list, &mdev->pads);
187 break;
188 case MEDIA_GRAPH_LINK:
189 list_add_tail(&gobj->list, &mdev->links);
190 break;
191 case MEDIA_GRAPH_INTF_DEVNODE:
192 list_add_tail(&gobj->list, &mdev->interfaces);
193 break;
194 }
195
196 mdev->topology_version++;
197
198 dev_dbg_obj(__func__, gobj);
199 }
200
201 void media_gobj_destroy(struct media_gobj *gobj)
202 {
203 /* Do nothing if the object is not linked. */
204 if (gobj->mdev == NULL)
205 return;
206
207 dev_dbg_obj(__func__, gobj);
208
209 gobj->mdev->topology_version++;
210
211 /* Remove the object from mdev list */
212 list_del(&gobj->list);
213
214 gobj->mdev = NULL;
215 }
216
217 int media_entity_pads_init(struct media_entity *entity, u16 num_pads,
218 struct media_pad *pads)
219 {
220 struct media_device *mdev = entity->graph_obj.mdev;
221 unsigned int i;
222
223 entity->num_pads = num_pads;
224 entity->pads = pads;
225
226 if (mdev)
227 mutex_lock(&mdev->graph_mutex);
228
229 for (i = 0; i < num_pads; i++) {
230 pads[i].entity = entity;
231 pads[i].index = i;
232 if (mdev)
233 media_gobj_create(mdev, MEDIA_GRAPH_PAD,
234 &entity->pads[i].graph_obj);
235 }
236
237 if (mdev)
238 mutex_unlock(&mdev->graph_mutex);
239
240 return 0;
241 }
242 EXPORT_SYMBOL_GPL(media_entity_pads_init);
243
244 /* -----------------------------------------------------------------------------
245 * Graph traversal
246 */
247
248 static struct media_entity *
249 media_entity_other(struct media_entity *entity, struct media_link *link)
250 {
251 if (link->source->entity == entity)
252 return link->sink->entity;
253 else
254 return link->source->entity;
255 }
256
257 /* push an entity to traversal stack */
258 static void stack_push(struct media_graph *graph,
259 struct media_entity *entity)
260 {
261 if (graph->top == MEDIA_ENTITY_ENUM_MAX_DEPTH - 1) {
262 WARN_ON(1);
263 return;
264 }
265 graph->top++;
266 graph->stack[graph->top].link = entity->links.next;
267 graph->stack[graph->top].entity = entity;
268 }
269
270 static struct media_entity *stack_pop(struct media_graph *graph)
271 {
272 struct media_entity *entity;
273
274 entity = graph->stack[graph->top].entity;
275 graph->top--;
276
277 return entity;
278 }
279
280 #define link_top(en) ((en)->stack[(en)->top].link)
281 #define stack_top(en) ((en)->stack[(en)->top].entity)
282
283 /*
284 * TODO: Get rid of this.
285 */
286 #define MEDIA_ENTITY_MAX_PADS 512
287
288 /**
289 * media_graph_walk_init - Allocate resources for graph walk
290 * @graph: Media graph structure that will be used to walk the graph
291 * @mdev: Media device
292 *
293 * Reserve resources for graph walk in media device's current
294 * state. The memory must be released using
295 * media_graph_walk_free().
296 *
297 * Returns error on failure, zero on success.
298 */
299 __must_check int media_graph_walk_init(
300 struct media_graph *graph, struct media_device *mdev)
301 {
302 return media_entity_enum_init(&graph->ent_enum, mdev);
303 }
304 EXPORT_SYMBOL_GPL(media_graph_walk_init);
305
306 /**
307 * media_graph_walk_cleanup - Release resources related to graph walking
308 * @graph: Media graph structure that was used to walk the graph
309 */
310 void media_graph_walk_cleanup(struct media_graph *graph)
311 {
312 media_entity_enum_cleanup(&graph->ent_enum);
313 }
314 EXPORT_SYMBOL_GPL(media_graph_walk_cleanup);
315
316 void media_graph_walk_start(struct media_graph *graph,
317 struct media_entity *entity)
318 {
319 media_entity_enum_zero(&graph->ent_enum);
320 media_entity_enum_set(&graph->ent_enum, entity);
321
322 graph->top = 0;
323 graph->stack[graph->top].entity = NULL;
324 stack_push(graph, entity);
325 dev_dbg(entity->graph_obj.mdev->dev,
326 "begin graph walk at '%s'\n", entity->name);
327 }
328 EXPORT_SYMBOL_GPL(media_graph_walk_start);
329
330 static void media_graph_walk_iter(struct media_graph *graph)
331 {
332 struct media_entity *entity = stack_top(graph);
333 struct media_link *link;
334 struct media_entity *next;
335
336 link = list_entry(link_top(graph), typeof(*link), list);
337
338 /* The link is not enabled so we do not follow. */
339 if (!(link->flags & MEDIA_LNK_FL_ENABLED)) {
340 link_top(graph) = link_top(graph)->next;
341 dev_dbg(entity->graph_obj.mdev->dev,
342 "walk: skipping disabled link '%s':%u -> '%s':%u\n",
343 link->source->entity->name, link->source->index,
344 link->sink->entity->name, link->sink->index);
345 return;
346 }
347
348 /* Get the entity in the other end of the link . */
349 next = media_entity_other(entity, link);
350
351 /* Has the entity already been visited? */
352 if (media_entity_enum_test_and_set(&graph->ent_enum, next)) {
353 link_top(graph) = link_top(graph)->next;
354 dev_dbg(entity->graph_obj.mdev->dev,
355 "walk: skipping entity '%s' (already seen)\n",
356 next->name);
357 return;
358 }
359
360 /* Push the new entity to stack and start over. */
361 link_top(graph) = link_top(graph)->next;
362 stack_push(graph, next);
363 dev_dbg(entity->graph_obj.mdev->dev, "walk: pushing '%s' on stack\n",
364 next->name);
365 }
366
367 struct media_entity *media_graph_walk_next(struct media_graph *graph)
368 {
369 struct media_entity *entity;
370
371 if (stack_top(graph) == NULL)
372 return NULL;
373
374 /*
375 * Depth first search. Push entity to stack and continue from
376 * top of the stack until no more entities on the level can be
377 * found.
378 */
379 while (link_top(graph) != &stack_top(graph)->links)
380 media_graph_walk_iter(graph);
381
382 entity = stack_pop(graph);
383 dev_dbg(entity->graph_obj.mdev->dev,
384 "walk: returning entity '%s'\n", entity->name);
385
386 return entity;
387 }
388 EXPORT_SYMBOL_GPL(media_graph_walk_next);
389
390 int media_entity_get_fwnode_pad(struct media_entity *entity,
391 struct fwnode_handle *fwnode,
392 unsigned long direction_flags)
393 {
394 struct fwnode_endpoint endpoint;
395 unsigned int i;
396 int ret;
397
398 if (!entity->ops || !entity->ops->get_fwnode_pad) {
399 for (i = 0; i < entity->num_pads; i++) {
400 if (entity->pads[i].flags & direction_flags)
401 return i;
402 }
403
404 return -ENXIO;
405 }
406
407 ret = fwnode_graph_parse_endpoint(fwnode, &endpoint);
408 if (ret)
409 return ret;
410
411 ret = entity->ops->get_fwnode_pad(&endpoint);
412 if (ret < 0)
413 return ret;
414
415 if (ret >= entity->num_pads)
416 return -ENXIO;
417
418 if (!(entity->pads[ret].flags & direction_flags))
419 return -ENXIO;
420
421 return ret;
422 }
423 EXPORT_SYMBOL_GPL(media_entity_get_fwnode_pad);
424
425 /* -----------------------------------------------------------------------------
426 * Pipeline management
427 */
428
429 __must_check int __media_pipeline_start(struct media_entity *entity,
430 struct media_pipeline *pipe)
431 {
432 struct media_device *mdev = entity->graph_obj.mdev;
433 struct media_graph *graph = &pipe->graph;
434 struct media_entity *entity_err = entity;
435 struct media_link *link;
436 int ret;
437
438 if (!pipe->streaming_count++) {
439 ret = media_graph_walk_init(&pipe->graph, mdev);
440 if (ret)
441 goto error_graph_walk_start;
442 }
443
444 media_graph_walk_start(&pipe->graph, entity);
445
446 while ((entity = media_graph_walk_next(graph))) {
447 DECLARE_BITMAP(active, MEDIA_ENTITY_MAX_PADS);
448 DECLARE_BITMAP(has_no_links, MEDIA_ENTITY_MAX_PADS);
449
450 entity->stream_count++;
451
452 if (WARN_ON(entity->pipe && entity->pipe != pipe)) {
453 ret = -EBUSY;
454 goto error;
455 }
456
457 entity->pipe = pipe;
458
459 /* Already streaming --- no need to check. */
460 if (entity->stream_count > 1)
461 continue;
462
463 if (!entity->ops || !entity->ops->link_validate)
464 continue;
465
466 bitmap_zero(active, entity->num_pads);
467 bitmap_fill(has_no_links, entity->num_pads);
468
469 list_for_each_entry(link, &entity->links, list) {
470 struct media_pad *pad = link->sink->entity == entity
471 ? link->sink : link->source;
472
473 /* Mark that a pad is connected by a link. */
474 bitmap_clear(has_no_links, pad->index, 1);
475
476 /*
477 * Pads that either do not need to connect or
478 * are connected through an enabled link are
479 * fine.
480 */
481 if (!(pad->flags & MEDIA_PAD_FL_MUST_CONNECT) ||
482 link->flags & MEDIA_LNK_FL_ENABLED)
483 bitmap_set(active, pad->index, 1);
484
485 /*
486 * Link validation will only take place for
487 * sink ends of the link that are enabled.
488 */
489 if (link->sink != pad ||
490 !(link->flags & MEDIA_LNK_FL_ENABLED))
491 continue;
492
493 ret = entity->ops->link_validate(link);
494 if (ret < 0 && ret != -ENOIOCTLCMD) {
495 dev_dbg(entity->graph_obj.mdev->dev,
496 "link validation failed for '%s':%u -> '%s':%u, error %d\n",
497 link->source->entity->name,
498 link->source->index,
499 entity->name, link->sink->index, ret);
500 goto error;
501 }
502 }
503
504 /* Either no links or validated links are fine. */
505 bitmap_or(active, active, has_no_links, entity->num_pads);
506
507 if (!bitmap_full(active, entity->num_pads)) {
508 ret = -ENOLINK;
509 dev_dbg(entity->graph_obj.mdev->dev,
510 "'%s':%u must be connected by an enabled link\n",
511 entity->name,
512 (unsigned)find_first_zero_bit(
513 active, entity->num_pads));
514 goto error;
515 }
516 }
517
518 return 0;
519
520 error:
521 /*
522 * Link validation on graph failed. We revert what we did and
523 * return the error.
524 */
525 media_graph_walk_start(graph, entity_err);
526
527 while ((entity_err = media_graph_walk_next(graph))) {
528 /* Sanity check for negative stream_count */
529 if (!WARN_ON_ONCE(entity_err->stream_count <= 0)) {
530 entity_err->stream_count--;
531 if (entity_err->stream_count == 0)
532 entity_err->pipe = NULL;
533 }
534
535 /*
536 * We haven't increased stream_count further than this
537 * so we quit here.
538 */
539 if (entity_err == entity)
540 break;
541 }
542
543 error_graph_walk_start:
544 if (!--pipe->streaming_count)
545 media_graph_walk_cleanup(graph);
546
547 return ret;
548 }
549 EXPORT_SYMBOL_GPL(__media_pipeline_start);
550
551 __must_check int media_pipeline_start(struct media_entity *entity,
552 struct media_pipeline *pipe)
553 {
554 struct media_device *mdev = entity->graph_obj.mdev;
555 int ret;
556
557 mutex_lock(&mdev->graph_mutex);
558 ret = __media_pipeline_start(entity, pipe);
559 mutex_unlock(&mdev->graph_mutex);
560 return ret;
561 }
562 EXPORT_SYMBOL_GPL(media_pipeline_start);
563
564 void __media_pipeline_stop(struct media_entity *entity)
565 {
566 struct media_graph *graph = &entity->pipe->graph;
567 struct media_pipeline *pipe = entity->pipe;
568
569 /*
570 * If the following check fails, the driver has performed an
571 * unbalanced call to media_pipeline_stop()
572 */
573 if (WARN_ON(!pipe))
574 return;
575
576 media_graph_walk_start(graph, entity);
577
578 while ((entity = media_graph_walk_next(graph))) {
579 /* Sanity check for negative stream_count */
580 if (!WARN_ON_ONCE(entity->stream_count <= 0)) {
581 entity->stream_count--;
582 if (entity->stream_count == 0)
583 entity->pipe = NULL;
584 }
585 }
586
587 if (!--pipe->streaming_count)
588 media_graph_walk_cleanup(graph);
589
590 }
591 EXPORT_SYMBOL_GPL(__media_pipeline_stop);
592
593 void media_pipeline_stop(struct media_entity *entity)
594 {
595 struct media_device *mdev = entity->graph_obj.mdev;
596
597 mutex_lock(&mdev->graph_mutex);
598 __media_pipeline_stop(entity);
599 mutex_unlock(&mdev->graph_mutex);
600 }
601 EXPORT_SYMBOL_GPL(media_pipeline_stop);
602
603 /* -----------------------------------------------------------------------------
604 * Module use count
605 */
606
607 struct media_entity *media_entity_get(struct media_entity *entity)
608 {
609 if (entity == NULL)
610 return NULL;
611
612 if (entity->graph_obj.mdev->dev &&
613 !try_module_get(entity->graph_obj.mdev->dev->driver->owner))
614 return NULL;
615
616 return entity;
617 }
618 EXPORT_SYMBOL_GPL(media_entity_get);
619
620 void media_entity_put(struct media_entity *entity)
621 {
622 if (entity == NULL)
623 return;
624
625 if (entity->graph_obj.mdev->dev)
626 module_put(entity->graph_obj.mdev->dev->driver->owner);
627 }
628 EXPORT_SYMBOL_GPL(media_entity_put);
629
630 /* -----------------------------------------------------------------------------
631 * Links management
632 */
633
634 static struct media_link *media_add_link(struct list_head *head)
635 {
636 struct media_link *link;
637
638 link = kzalloc(sizeof(*link), GFP_KERNEL);
639 if (link == NULL)
640 return NULL;
641
642 list_add_tail(&link->list, head);
643
644 return link;
645 }
646
647 static void __media_entity_remove_link(struct media_entity *entity,
648 struct media_link *link)
649 {
650 struct media_link *rlink, *tmp;
651 struct media_entity *remote;
652
653 if (link->source->entity == entity)
654 remote = link->sink->entity;
655 else
656 remote = link->source->entity;
657
658 list_for_each_entry_safe(rlink, tmp, &remote->links, list) {
659 if (rlink != link->reverse)
660 continue;
661
662 if (link->source->entity == entity)
663 remote->num_backlinks--;
664
665 /* Remove the remote link */
666 list_del(&rlink->list);
667 media_gobj_destroy(&rlink->graph_obj);
668 kfree(rlink);
669
670 if (--remote->num_links == 0)
671 break;
672 }
673 list_del(&link->list);
674 media_gobj_destroy(&link->graph_obj);
675 kfree(link);
676 }
677
678 int
679 media_create_pad_link(struct media_entity *source, u16 source_pad,
680 struct media_entity *sink, u16 sink_pad, u32 flags)
681 {
682 struct media_link *link;
683 struct media_link *backlink;
684
685 BUG_ON(source == NULL || sink == NULL);
686 BUG_ON(source_pad >= source->num_pads);
687 BUG_ON(sink_pad >= sink->num_pads);
688
689 link = media_add_link(&source->links);
690 if (link == NULL)
691 return -ENOMEM;
692
693 link->source = &source->pads[source_pad];
694 link->sink = &sink->pads[sink_pad];
695 link->flags = flags & ~MEDIA_LNK_FL_INTERFACE_LINK;
696
697 /* Initialize graph object embedded at the new link */
698 media_gobj_create(source->graph_obj.mdev, MEDIA_GRAPH_LINK,
699 &link->graph_obj);
700
701 /* Create the backlink. Backlinks are used to help graph traversal and
702 * are not reported to userspace.
703 */
704 backlink = media_add_link(&sink->links);
705 if (backlink == NULL) {
706 __media_entity_remove_link(source, link);
707 return -ENOMEM;
708 }
709
710 backlink->source = &source->pads[source_pad];
711 backlink->sink = &sink->pads[sink_pad];
712 backlink->flags = flags;
713 backlink->is_backlink = true;
714
715 /* Initialize graph object embedded at the new link */
716 media_gobj_create(sink->graph_obj.mdev, MEDIA_GRAPH_LINK,
717 &backlink->graph_obj);
718
719 link->reverse = backlink;
720 backlink->reverse = link;
721
722 sink->num_backlinks++;
723 sink->num_links++;
724 source->num_links++;
725
726 return 0;
727 }
728 EXPORT_SYMBOL_GPL(media_create_pad_link);
729
730 int media_create_pad_links(const struct media_device *mdev,
731 const u32 source_function,
732 struct media_entity *source,
733 const u16 source_pad,
734 const u32 sink_function,
735 struct media_entity *sink,
736 const u16 sink_pad,
737 u32 flags,
738 const bool allow_both_undefined)
739 {
740 struct media_entity *entity;
741 unsigned function;
742 int ret;
743
744 /* Trivial case: 1:1 relation */
745 if (source && sink)
746 return media_create_pad_link(source, source_pad,
747 sink, sink_pad, flags);
748
749 /* Worse case scenario: n:n relation */
750 if (!source && !sink) {
751 if (!allow_both_undefined)
752 return 0;
753 media_device_for_each_entity(source, mdev) {
754 if (source->function != source_function)
755 continue;
756 media_device_for_each_entity(sink, mdev) {
757 if (sink->function != sink_function)
758 continue;
759 ret = media_create_pad_link(source, source_pad,
760 sink, sink_pad,
761 flags);
762 if (ret)
763 return ret;
764 flags &= ~(MEDIA_LNK_FL_ENABLED |
765 MEDIA_LNK_FL_IMMUTABLE);
766 }
767 }
768 return 0;
769 }
770
771 /* Handle 1:n and n:1 cases */
772 if (source)
773 function = sink_function;
774 else
775 function = source_function;
776
777 media_device_for_each_entity(entity, mdev) {
778 if (entity->function != function)
779 continue;
780
781 if (source)
782 ret = media_create_pad_link(source, source_pad,
783 entity, sink_pad, flags);
784 else
785 ret = media_create_pad_link(entity, source_pad,
786 sink, sink_pad, flags);
787 if (ret)
788 return ret;
789 flags &= ~(MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE);
790 }
791 return 0;
792 }
793 EXPORT_SYMBOL_GPL(media_create_pad_links);
794
795 void __media_entity_remove_links(struct media_entity *entity)
796 {
797 struct media_link *link, *tmp;
798
799 list_for_each_entry_safe(link, tmp, &entity->links, list)
800 __media_entity_remove_link(entity, link);
801
802 entity->num_links = 0;
803 entity->num_backlinks = 0;
804 }
805 EXPORT_SYMBOL_GPL(__media_entity_remove_links);
806
807 void media_entity_remove_links(struct media_entity *entity)
808 {
809 struct media_device *mdev = entity->graph_obj.mdev;
810
811 /* Do nothing if the entity is not registered. */
812 if (mdev == NULL)
813 return;
814
815 mutex_lock(&mdev->graph_mutex);
816 __media_entity_remove_links(entity);
817 mutex_unlock(&mdev->graph_mutex);
818 }
819 EXPORT_SYMBOL_GPL(media_entity_remove_links);
820
821 static int __media_entity_setup_link_notify(struct media_link *link, u32 flags)
822 {
823 int ret;
824
825 /* Notify both entities. */
826 ret = media_entity_call(link->source->entity, link_setup,
827 link->source, link->sink, flags);
828 if (ret < 0 && ret != -ENOIOCTLCMD)
829 return ret;
830
831 ret = media_entity_call(link->sink->entity, link_setup,
832 link->sink, link->source, flags);
833 if (ret < 0 && ret != -ENOIOCTLCMD) {
834 media_entity_call(link->source->entity, link_setup,
835 link->source, link->sink, link->flags);
836 return ret;
837 }
838
839 link->flags = flags;
840 link->reverse->flags = link->flags;
841
842 return 0;
843 }
844
845 int __media_entity_setup_link(struct media_link *link, u32 flags)
846 {
847 const u32 mask = MEDIA_LNK_FL_ENABLED;
848 struct media_device *mdev;
849 struct media_entity *source, *sink;
850 int ret = -EBUSY;
851
852 if (link == NULL)
853 return -EINVAL;
854
855 /* The non-modifiable link flags must not be modified. */
856 if ((link->flags & ~mask) != (flags & ~mask))
857 return -EINVAL;
858
859 if (link->flags & MEDIA_LNK_FL_IMMUTABLE)
860 return link->flags == flags ? 0 : -EINVAL;
861
862 if (link->flags == flags)
863 return 0;
864
865 source = link->source->entity;
866 sink = link->sink->entity;
867
868 if (!(link->flags & MEDIA_LNK_FL_DYNAMIC) &&
869 (source->stream_count || sink->stream_count))
870 return -EBUSY;
871
872 mdev = source->graph_obj.mdev;
873
874 if (mdev->ops && mdev->ops->link_notify) {
875 ret = mdev->ops->link_notify(link, flags,
876 MEDIA_DEV_NOTIFY_PRE_LINK_CH);
877 if (ret < 0)
878 return ret;
879 }
880
881 ret = __media_entity_setup_link_notify(link, flags);
882
883 if (mdev->ops && mdev->ops->link_notify)
884 mdev->ops->link_notify(link, flags,
885 MEDIA_DEV_NOTIFY_POST_LINK_CH);
886
887 return ret;
888 }
889 EXPORT_SYMBOL_GPL(__media_entity_setup_link);
890
891 int media_entity_setup_link(struct media_link *link, u32 flags)
892 {
893 int ret;
894
895 mutex_lock(&link->graph_obj.mdev->graph_mutex);
896 ret = __media_entity_setup_link(link, flags);
897 mutex_unlock(&link->graph_obj.mdev->graph_mutex);
898
899 return ret;
900 }
901 EXPORT_SYMBOL_GPL(media_entity_setup_link);
902
903 struct media_link *
904 media_entity_find_link(struct media_pad *source, struct media_pad *sink)
905 {
906 struct media_link *link;
907
908 list_for_each_entry(link, &source->entity->links, list) {
909 if (link->source->entity == source->entity &&
910 link->source->index == source->index &&
911 link->sink->entity == sink->entity &&
912 link->sink->index == sink->index)
913 return link;
914 }
915
916 return NULL;
917 }
918 EXPORT_SYMBOL_GPL(media_entity_find_link);
919
920 struct media_pad *media_entity_remote_pad(const struct media_pad *pad)
921 {
922 struct media_link *link;
923
924 list_for_each_entry(link, &pad->entity->links, list) {
925 if (!(link->flags & MEDIA_LNK_FL_ENABLED))
926 continue;
927
928 if (link->source == pad)
929 return link->sink;
930
931 if (link->sink == pad)
932 return link->source;
933 }
934
935 return NULL;
936
937 }
938 EXPORT_SYMBOL_GPL(media_entity_remote_pad);
939
940 static void media_interface_init(struct media_device *mdev,
941 struct media_interface *intf,
942 u32 gobj_type,
943 u32 intf_type, u32 flags)
944 {
945 intf->type = intf_type;
946 intf->flags = flags;
947 INIT_LIST_HEAD(&intf->links);
948
949 media_gobj_create(mdev, gobj_type, &intf->graph_obj);
950 }
951
952 /* Functions related to the media interface via device nodes */
953
954 struct media_intf_devnode *media_devnode_create(struct media_device *mdev,
955 u32 type, u32 flags,
956 u32 major, u32 minor)
957 {
958 struct media_intf_devnode *devnode;
959
960 devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
961 if (!devnode)
962 return NULL;
963
964 devnode->major = major;
965 devnode->minor = minor;
966
967 media_interface_init(mdev, &devnode->intf, MEDIA_GRAPH_INTF_DEVNODE,
968 type, flags);
969
970 return devnode;
971 }
972 EXPORT_SYMBOL_GPL(media_devnode_create);
973
974 void media_devnode_remove(struct media_intf_devnode *devnode)
975 {
976 media_remove_intf_links(&devnode->intf);
977 media_gobj_destroy(&devnode->intf.graph_obj);
978 kfree(devnode);
979 }
980 EXPORT_SYMBOL_GPL(media_devnode_remove);
981
982 struct media_link *media_create_intf_link(struct media_entity *entity,
983 struct media_interface *intf,
984 u32 flags)
985 {
986 struct media_link *link;
987
988 link = media_add_link(&intf->links);
989 if (link == NULL)
990 return NULL;
991
992 link->intf = intf;
993 link->entity = entity;
994 link->flags = flags | MEDIA_LNK_FL_INTERFACE_LINK;
995
996 /* Initialize graph object embedded at the new link */
997 media_gobj_create(intf->graph_obj.mdev, MEDIA_GRAPH_LINK,
998 &link->graph_obj);
999
1000 return link;
1001 }
1002 EXPORT_SYMBOL_GPL(media_create_intf_link);
1003
1004 void __media_remove_intf_link(struct media_link *link)
1005 {
1006 list_del(&link->list);
1007 media_gobj_destroy(&link->graph_obj);
1008 kfree(link);
1009 }
1010 EXPORT_SYMBOL_GPL(__media_remove_intf_link);
1011
1012 void media_remove_intf_link(struct media_link *link)
1013 {
1014 struct media_device *mdev = link->graph_obj.mdev;
1015
1016 /* Do nothing if the intf is not registered. */
1017 if (mdev == NULL)
1018 return;
1019
1020 mutex_lock(&mdev->graph_mutex);
1021 __media_remove_intf_link(link);
1022 mutex_unlock(&mdev->graph_mutex);
1023 }
1024 EXPORT_SYMBOL_GPL(media_remove_intf_link);
1025
1026 void __media_remove_intf_links(struct media_interface *intf)
1027 {
1028 struct media_link *link, *tmp;
1029
1030 list_for_each_entry_safe(link, tmp, &intf->links, list)
1031 __media_remove_intf_link(link);
1032
1033 }
1034 EXPORT_SYMBOL_GPL(__media_remove_intf_links);
1035
1036 void media_remove_intf_links(struct media_interface *intf)
1037 {
1038 struct media_device *mdev = intf->graph_obj.mdev;
1039
1040 /* Do nothing if the intf is not registered. */
1041 if (mdev == NULL)
1042 return;
1043
1044 mutex_lock(&mdev->graph_mutex);
1045 __media_remove_intf_links(intf);
1046 mutex_unlock(&mdev->graph_mutex);
1047 }
1048 EXPORT_SYMBOL_GPL(media_remove_intf_links);
Linux with added FPC-III support