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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 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#include <linux/bitmap.h>
24#include <linux/module.h>
25#include <linux/slab.h>
26#include <media/media-entity.h>
27#include <media/media-device.h>
28
29static inline const char *gobj_type(enum media_gobj_type type)
30{
31 switch (type) {
32 case MEDIA_GRAPH_ENTITY:
33 return "entity";
34 case MEDIA_GRAPH_PAD:
35 return "pad";
36 case MEDIA_GRAPH_LINK:
37 return "link";
38 case MEDIA_GRAPH_INTF_DEVNODE:
39 return "intf-devnode";
40 default:
41 return "unknown";
42 }
43}
44
45static inline const char *intf_type(struct media_interface *intf)
46{
47 switch (intf->type) {
48 case MEDIA_INTF_T_DVB_FE:
49 return "dvb-frontend";
50 case MEDIA_INTF_T_DVB_DEMUX:
51 return "dvb-demux";
52 case MEDIA_INTF_T_DVB_DVR:
53 return "dvb-dvr";
54 case MEDIA_INTF_T_DVB_CA:
55 return "dvb-ca";
56 case MEDIA_INTF_T_DVB_NET:
57 return "dvb-net";
58 case MEDIA_INTF_T_V4L_VIDEO:
59 return "v4l-video";
60 case MEDIA_INTF_T_V4L_VBI:
61 return "v4l-vbi";
62 case MEDIA_INTF_T_V4L_RADIO:
63 return "v4l-radio";
64 case MEDIA_INTF_T_V4L_SUBDEV:
65 return "v4l-subdev";
66 case MEDIA_INTF_T_V4L_SWRADIO:
67 return "v4l-swradio";
68 case MEDIA_INTF_T_V4L_TOUCH:
69 return "v4l-touch";
70 case MEDIA_INTF_T_ALSA_PCM_CAPTURE:
71 return "alsa-pcm-capture";
72 case MEDIA_INTF_T_ALSA_PCM_PLAYBACK:
73 return "alsa-pcm-playback";
74 case MEDIA_INTF_T_ALSA_CONTROL:
75 return "alsa-control";
76 case MEDIA_INTF_T_ALSA_COMPRESS:
77 return "alsa-compress";
78 case MEDIA_INTF_T_ALSA_RAWMIDI:
79 return "alsa-rawmidi";
80 case MEDIA_INTF_T_ALSA_HWDEP:
81 return "alsa-hwdep";
82 case MEDIA_INTF_T_ALSA_SEQUENCER:
83 return "alsa-sequencer";
84 case MEDIA_INTF_T_ALSA_TIMER:
85 return "alsa-timer";
86 default:
87 return "unknown-intf";
88 }
89};
90
91__must_check int __media_entity_enum_init(struct media_entity_enum *ent_enum,
92 int idx_max)
93{
94 idx_max = ALIGN(idx_max, BITS_PER_LONG);
95 ent_enum->bmap = kcalloc(idx_max / BITS_PER_LONG, sizeof(long),
96 GFP_KERNEL);
97 if (!ent_enum->bmap)
98 return -ENOMEM;
99
100 bitmap_zero(ent_enum->bmap, idx_max);
101 ent_enum->idx_max = idx_max;
102
103 return 0;
104}
105EXPORT_SYMBOL_GPL(__media_entity_enum_init);
106
107void media_entity_enum_cleanup(struct media_entity_enum *ent_enum)
108{
109 kfree(ent_enum->bmap);
110}
111EXPORT_SYMBOL_GPL(media_entity_enum_cleanup);
112
113/**
114 * dev_dbg_obj - Prints in debug mode a change on some object
115 *
116 * @event_name: Name of the event to report. Could be __func__
117 * @gobj: Pointer to the object
118 *
119 * Enabled only if DEBUG or CONFIG_DYNAMIC_DEBUG. Otherwise, it
120 * won't produce any code.
121 */
122static void dev_dbg_obj(const char *event_name, struct media_gobj *gobj)
123{
124#if defined(DEBUG) || defined (CONFIG_DYNAMIC_DEBUG)
125 switch (media_type(gobj)) {
126 case MEDIA_GRAPH_ENTITY:
127 dev_dbg(gobj->mdev->dev,
128 "%s id %u: entity '%s'\n",
129 event_name, media_id(gobj),
130 gobj_to_entity(gobj)->name);
131 break;
132 case MEDIA_GRAPH_LINK:
133 {
134 struct media_link *link = gobj_to_link(gobj);
135
136 dev_dbg(gobj->mdev->dev,
137 "%s id %u: %s link id %u ==> id %u\n",
138 event_name, media_id(gobj),
139 media_type(link->gobj0) == MEDIA_GRAPH_PAD ?
140 "data" : "interface",
141 media_id(link->gobj0),
142 media_id(link->gobj1));
143 break;
144 }
145 case MEDIA_GRAPH_PAD:
146 {
147 struct media_pad *pad = gobj_to_pad(gobj);
148
149 dev_dbg(gobj->mdev->dev,
150 "%s id %u: %s%spad '%s':%d\n",
151 event_name, media_id(gobj),
152 pad->flags & MEDIA_PAD_FL_SINK ? "sink " : "",
153 pad->flags & MEDIA_PAD_FL_SOURCE ? "source " : "",
154 pad->entity->name, pad->index);
155 break;
156 }
157 case MEDIA_GRAPH_INTF_DEVNODE:
158 {
159 struct media_interface *intf = gobj_to_intf(gobj);
160 struct media_intf_devnode *devnode = intf_to_devnode(intf);
161
162 dev_dbg(gobj->mdev->dev,
163 "%s id %u: intf_devnode %s - major: %d, minor: %d\n",
164 event_name, media_id(gobj),
165 intf_type(intf),
166 devnode->major, devnode->minor);
167 break;
168 }
169 }
170#endif
171}
172
173void media_gobj_create(struct media_device *mdev,
174 enum media_gobj_type type,
175 struct media_gobj *gobj)
176{
177 BUG_ON(!mdev);
178
179 gobj->mdev = mdev;
180
181 /* Create a per-type unique object ID */
182 gobj->id = media_gobj_gen_id(type, ++mdev->id);
183
184 switch (type) {
185 case MEDIA_GRAPH_ENTITY:
186 list_add_tail(&gobj->list, &mdev->entities);
187 break;
188 case MEDIA_GRAPH_PAD:
189 list_add_tail(&gobj->list, &mdev->pads);
190 break;
191 case MEDIA_GRAPH_LINK:
192 list_add_tail(&gobj->list, &mdev->links);
193 break;
194 case MEDIA_GRAPH_INTF_DEVNODE:
195 list_add_tail(&gobj->list, &mdev->interfaces);
196 break;
197 }
198
199 mdev->topology_version++;
200
201 dev_dbg_obj(__func__, gobj);
202}
203
204void media_gobj_destroy(struct media_gobj *gobj)
205{
206 dev_dbg_obj(__func__, gobj);
207
208 /* Do nothing if the object is not linked. */
209 if (gobj->mdev == NULL)
210 return;
211
212 gobj->mdev->topology_version++;
213
214 /* Remove the object from mdev list */
215 list_del(&gobj->list);
216
217 gobj->mdev = NULL;
218}
219
220int media_entity_pads_init(struct media_entity *entity, u16 num_pads,
221 struct media_pad *pads)
222{
223 struct media_device *mdev = entity->graph_obj.mdev;
224 unsigned int i;
225
226 entity->num_pads = num_pads;
227 entity->pads = pads;
228
229 if (mdev)
230 mutex_lock(&mdev->graph_mutex);
231
232 for (i = 0; i < num_pads; i++) {
233 pads[i].entity = entity;
234 pads[i].index = i;
235 if (mdev)
236 media_gobj_create(mdev, MEDIA_GRAPH_PAD,
237 &entity->pads[i].graph_obj);
238 }
239
240 if (mdev)
241 mutex_unlock(&mdev->graph_mutex);
242
243 return 0;
244}
245EXPORT_SYMBOL_GPL(media_entity_pads_init);
246
247/* -----------------------------------------------------------------------------
248 * Graph traversal
249 */
250
251static struct media_entity *
252media_entity_other(struct media_entity *entity, struct media_link *link)
253{
254 if (link->source->entity == entity)
255 return link->sink->entity;
256 else
257 return link->source->entity;
258}
259
260/* push an entity to traversal stack */
261static void stack_push(struct media_entity_graph *graph,
262 struct media_entity *entity)
263{
264 if (graph->top == MEDIA_ENTITY_ENUM_MAX_DEPTH - 1) {
265 WARN_ON(1);
266 return;
267 }
268 graph->top++;
269 graph->stack[graph->top].link = entity->links.next;
270 graph->stack[graph->top].entity = entity;
271}
272
273static struct media_entity *stack_pop(struct media_entity_graph *graph)
274{
275 struct media_entity *entity;
276
277 entity = graph->stack[graph->top].entity;
278 graph->top--;
279
280 return entity;
281}
282
283#define link_top(en) ((en)->stack[(en)->top].link)
284#define stack_top(en) ((en)->stack[(en)->top].entity)
285
286/*
287 * TODO: Get rid of this.
288 */
289#define MEDIA_ENTITY_MAX_PADS 512
290
291/**
292 * media_entity_graph_walk_init - Allocate resources for graph walk
293 * @graph: Media graph structure that will be used to walk the graph
294 * @mdev: Media device
295 *
296 * Reserve resources for graph walk in media device's current
297 * state. The memory must be released using
298 * media_entity_graph_walk_free().
299 *
300 * Returns error on failure, zero on success.
301 */
302__must_check int media_entity_graph_walk_init(
303 struct media_entity_graph *graph, struct media_device *mdev)
304{
305 return media_entity_enum_init(&graph->ent_enum, mdev);
306}
307EXPORT_SYMBOL_GPL(media_entity_graph_walk_init);
308
309/**
310 * media_entity_graph_walk_cleanup - Release resources related to graph walking
311 * @graph: Media graph structure that was used to walk the graph
312 */
313void media_entity_graph_walk_cleanup(struct media_entity_graph *graph)
314{
315 media_entity_enum_cleanup(&graph->ent_enum);
316}
317EXPORT_SYMBOL_GPL(media_entity_graph_walk_cleanup);
318
319void media_entity_graph_walk_start(struct media_entity_graph *graph,
320 struct media_entity *entity)
321{
322 media_entity_enum_zero(&graph->ent_enum);
323 media_entity_enum_set(&graph->ent_enum, entity);
324
325 graph->top = 0;
326 graph->stack[graph->top].entity = NULL;
327 stack_push(graph, entity);
328}
329EXPORT_SYMBOL_GPL(media_entity_graph_walk_start);
330
331struct media_entity *
332media_entity_graph_walk_next(struct media_entity_graph *graph)
333{
334 if (stack_top(graph) == NULL)
335 return NULL;
336
337 /*
338 * Depth first search. Push entity to stack and continue from
339 * top of the stack until no more entities on the level can be
340 * found.
341 */
342 while (link_top(graph) != &stack_top(graph)->links) {
343 struct media_entity *entity = stack_top(graph);
344 struct media_link *link;
345 struct media_entity *next;
346
347 link = list_entry(link_top(graph), typeof(*link), list);
348
349 /* The link is not enabled so we do not follow. */
350 if (!(link->flags & MEDIA_LNK_FL_ENABLED)) {
351 link_top(graph) = link_top(graph)->next;
352 continue;
353 }
354
355 /* Get the entity in the other end of the link . */
356 next = media_entity_other(entity, link);
357
358 /* Has the entity already been visited? */
359 if (media_entity_enum_test_and_set(&graph->ent_enum, next)) {
360 link_top(graph) = link_top(graph)->next;
361 continue;
362 }
363
364 /* Push the new entity to stack and start over. */
365 link_top(graph) = link_top(graph)->next;
366 stack_push(graph, next);
367 }
368
369 return stack_pop(graph);
370}
371EXPORT_SYMBOL_GPL(media_entity_graph_walk_next);
372
373/* -----------------------------------------------------------------------------
374 * Pipeline management
375 */
376
377__must_check int __media_entity_pipeline_start(struct media_entity *entity,
378 struct media_pipeline *pipe)
379{
380 struct media_device *mdev = entity->graph_obj.mdev;
381 struct media_entity_graph *graph = &pipe->graph;
382 struct media_entity *entity_err = entity;
383 struct media_link *link;
384 int ret;
385
386 if (!pipe->streaming_count++) {
387 ret = media_entity_graph_walk_init(&pipe->graph, mdev);
388 if (ret)
389 goto error_graph_walk_start;
390 }
391
392 media_entity_graph_walk_start(&pipe->graph, entity);
393
394 while ((entity = media_entity_graph_walk_next(graph))) {
395 DECLARE_BITMAP(active, MEDIA_ENTITY_MAX_PADS);
396 DECLARE_BITMAP(has_no_links, MEDIA_ENTITY_MAX_PADS);
397
398 entity->stream_count++;
399
400 if (WARN_ON(entity->pipe && entity->pipe != pipe)) {
401 ret = -EBUSY;
402 goto error;
403 }
404
405 entity->pipe = pipe;
406
407 /* Already streaming --- no need to check. */
408 if (entity->stream_count > 1)
409 continue;
410
411 if (!entity->ops || !entity->ops->link_validate)
412 continue;
413
414 bitmap_zero(active, entity->num_pads);
415 bitmap_fill(has_no_links, entity->num_pads);
416
417 list_for_each_entry(link, &entity->links, list) {
418 struct media_pad *pad = link->sink->entity == entity
419 ? link->sink : link->source;
420
421 /* Mark that a pad is connected by a link. */
422 bitmap_clear(has_no_links, pad->index, 1);
423
424 /*
425 * Pads that either do not need to connect or
426 * are connected through an enabled link are
427 * fine.
428 */
429 if (!(pad->flags & MEDIA_PAD_FL_MUST_CONNECT) ||
430 link->flags & MEDIA_LNK_FL_ENABLED)
431 bitmap_set(active, pad->index, 1);
432
433 /*
434 * Link validation will only take place for
435 * sink ends of the link that are enabled.
436 */
437 if (link->sink != pad ||
438 !(link->flags & MEDIA_LNK_FL_ENABLED))
439 continue;
440
441 ret = entity->ops->link_validate(link);
442 if (ret < 0 && ret != -ENOIOCTLCMD) {
443 dev_dbg(entity->graph_obj.mdev->dev,
444 "link validation failed for \"%s\":%u -> \"%s\":%u, error %d\n",
445 link->source->entity->name,
446 link->source->index,
447 entity->name, link->sink->index, ret);
448 goto error;
449 }
450 }
451
452 /* Either no links or validated links are fine. */
453 bitmap_or(active, active, has_no_links, entity->num_pads);
454
455 if (!bitmap_full(active, entity->num_pads)) {
456 ret = -ENOLINK;
457 dev_dbg(entity->graph_obj.mdev->dev,
458 "\"%s\":%u must be connected by an enabled link\n",
459 entity->name,
460 (unsigned)find_first_zero_bit(
461 active, entity->num_pads));
462 goto error;
463 }
464 }
465
466 return 0;
467
468error:
469 /*
470 * Link validation on graph failed. We revert what we did and
471 * return the error.
472 */
473 media_entity_graph_walk_start(graph, entity_err);
474
475 while ((entity_err = media_entity_graph_walk_next(graph))) {
476 /* don't let the stream_count go negative */
477 if (entity->stream_count > 0) {
478 entity_err->stream_count--;
479 if (entity_err->stream_count == 0)
480 entity_err->pipe = NULL;
481 }
482
483 /*
484 * We haven't increased stream_count further than this
485 * so we quit here.
486 */
487 if (entity_err == entity)
488 break;
489 }
490
491error_graph_walk_start:
492 if (!--pipe->streaming_count)
493 media_entity_graph_walk_cleanup(graph);
494
495 return ret;
496}
497EXPORT_SYMBOL_GPL(__media_entity_pipeline_start);
498
499__must_check int media_entity_pipeline_start(struct media_entity *entity,
500 struct media_pipeline *pipe)
501{
502 struct media_device *mdev = entity->graph_obj.mdev;
503 int ret;
504
505 mutex_lock(&mdev->graph_mutex);
506 ret = __media_entity_pipeline_start(entity, pipe);
507 mutex_unlock(&mdev->graph_mutex);
508 return ret;
509}
510EXPORT_SYMBOL_GPL(media_entity_pipeline_start);
511
512void __media_entity_pipeline_stop(struct media_entity *entity)
513{
514 struct media_entity_graph *graph = &entity->pipe->graph;
515 struct media_pipeline *pipe = entity->pipe;
516
517
518 WARN_ON(!pipe->streaming_count);
519 media_entity_graph_walk_start(graph, entity);
520
521 while ((entity = media_entity_graph_walk_next(graph))) {
522 /* don't let the stream_count go negative */
523 if (entity->stream_count > 0) {
524 entity->stream_count--;
525 if (entity->stream_count == 0)
526 entity->pipe = NULL;
527 }
528 }
529
530 if (!--pipe->streaming_count)
531 media_entity_graph_walk_cleanup(graph);
532
533}
534EXPORT_SYMBOL_GPL(__media_entity_pipeline_stop);
535
536void media_entity_pipeline_stop(struct media_entity *entity)
537{
538 struct media_device *mdev = entity->graph_obj.mdev;
539
540 mutex_lock(&mdev->graph_mutex);
541 __media_entity_pipeline_stop(entity);
542 mutex_unlock(&mdev->graph_mutex);
543}
544EXPORT_SYMBOL_GPL(media_entity_pipeline_stop);
545
546/* -----------------------------------------------------------------------------
547 * Module use count
548 */
549
550struct media_entity *media_entity_get(struct media_entity *entity)
551{
552 if (entity == NULL)
553 return NULL;
554
555 if (entity->graph_obj.mdev->dev &&
556 !try_module_get(entity->graph_obj.mdev->dev->driver->owner))
557 return NULL;
558
559 return entity;
560}
561EXPORT_SYMBOL_GPL(media_entity_get);
562
563void media_entity_put(struct media_entity *entity)
564{
565 if (entity == NULL)
566 return;
567
568 if (entity->graph_obj.mdev->dev)
569 module_put(entity->graph_obj.mdev->dev->driver->owner);
570}
571EXPORT_SYMBOL_GPL(media_entity_put);
572
573/* -----------------------------------------------------------------------------
574 * Links management
575 */
576
577static struct media_link *media_add_link(struct list_head *head)
578{
579 struct media_link *link;
580
581 link = kzalloc(sizeof(*link), GFP_KERNEL);
582 if (link == NULL)
583 return NULL;
584
585 list_add_tail(&link->list, head);
586
587 return link;
588}
589
590static void __media_entity_remove_link(struct media_entity *entity,
591 struct media_link *link)
592{
593 struct media_link *rlink, *tmp;
594 struct media_entity *remote;
595
596 if (link->source->entity == entity)
597 remote = link->sink->entity;
598 else
599 remote = link->source->entity;
600
601 list_for_each_entry_safe(rlink, tmp, &remote->links, list) {
602 if (rlink != link->reverse)
603 continue;
604
605 if (link->source->entity == entity)
606 remote->num_backlinks--;
607
608 /* Remove the remote link */
609 list_del(&rlink->list);
610 media_gobj_destroy(&rlink->graph_obj);
611 kfree(rlink);
612
613 if (--remote->num_links == 0)
614 break;
615 }
616 list_del(&link->list);
617 media_gobj_destroy(&link->graph_obj);
618 kfree(link);
619}
620
621int
622media_create_pad_link(struct media_entity *source, u16 source_pad,
623 struct media_entity *sink, u16 sink_pad, u32 flags)
624{
625 struct media_link *link;
626 struct media_link *backlink;
627
628 BUG_ON(source == NULL || sink == NULL);
629 BUG_ON(source_pad >= source->num_pads);
630 BUG_ON(sink_pad >= sink->num_pads);
631
632 link = media_add_link(&source->links);
633 if (link == NULL)
634 return -ENOMEM;
635
636 link->source = &source->pads[source_pad];
637 link->sink = &sink->pads[sink_pad];
638 link->flags = flags & ~MEDIA_LNK_FL_INTERFACE_LINK;
639
640 /* Initialize graph object embedded at the new link */
641 media_gobj_create(source->graph_obj.mdev, MEDIA_GRAPH_LINK,
642 &link->graph_obj);
643
644 /* Create the backlink. Backlinks are used to help graph traversal and
645 * are not reported to userspace.
646 */
647 backlink = media_add_link(&sink->links);
648 if (backlink == NULL) {
649 __media_entity_remove_link(source, link);
650 return -ENOMEM;
651 }
652
653 backlink->source = &source->pads[source_pad];
654 backlink->sink = &sink->pads[sink_pad];
655 backlink->flags = flags;
656 backlink->is_backlink = true;
657
658 /* Initialize graph object embedded at the new link */
659 media_gobj_create(sink->graph_obj.mdev, MEDIA_GRAPH_LINK,
660 &backlink->graph_obj);
661
662 link->reverse = backlink;
663 backlink->reverse = link;
664
665 sink->num_backlinks++;
666 sink->num_links++;
667 source->num_links++;
668
669 return 0;
670}
671EXPORT_SYMBOL_GPL(media_create_pad_link);
672
673int media_create_pad_links(const struct media_device *mdev,
674 const u32 source_function,
675 struct media_entity *source,
676 const u16 source_pad,
677 const u32 sink_function,
678 struct media_entity *sink,
679 const u16 sink_pad,
680 u32 flags,
681 const bool allow_both_undefined)
682{
683 struct media_entity *entity;
684 unsigned function;
685 int ret;
686
687 /* Trivial case: 1:1 relation */
688 if (source && sink)
689 return media_create_pad_link(source, source_pad,
690 sink, sink_pad, flags);
691
692 /* Worse case scenario: n:n relation */
693 if (!source && !sink) {
694 if (!allow_both_undefined)
695 return 0;
696 media_device_for_each_entity(source, mdev) {
697 if (source->function != source_function)
698 continue;
699 media_device_for_each_entity(sink, mdev) {
700 if (sink->function != sink_function)
701 continue;
702 ret = media_create_pad_link(source, source_pad,
703 sink, sink_pad,
704 flags);
705 if (ret)
706 return ret;
707 flags &= ~(MEDIA_LNK_FL_ENABLED |
708 MEDIA_LNK_FL_IMMUTABLE);
709 }
710 }
711 return 0;
712 }
713
714 /* Handle 1:n and n:1 cases */
715 if (source)
716 function = sink_function;
717 else
718 function = source_function;
719
720 media_device_for_each_entity(entity, mdev) {
721 if (entity->function != function)
722 continue;
723
724 if (source)
725 ret = media_create_pad_link(source, source_pad,
726 entity, sink_pad, flags);
727 else
728 ret = media_create_pad_link(entity, source_pad,
729 sink, sink_pad, flags);
730 if (ret)
731 return ret;
732 flags &= ~(MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE);
733 }
734 return 0;
735}
736EXPORT_SYMBOL_GPL(media_create_pad_links);
737
738void __media_entity_remove_links(struct media_entity *entity)
739{
740 struct media_link *link, *tmp;
741
742 list_for_each_entry_safe(link, tmp, &entity->links, list)
743 __media_entity_remove_link(entity, link);
744
745 entity->num_links = 0;
746 entity->num_backlinks = 0;
747}
748EXPORT_SYMBOL_GPL(__media_entity_remove_links);
749
750void media_entity_remove_links(struct media_entity *entity)
751{
752 struct media_device *mdev = entity->graph_obj.mdev;
753
754 /* Do nothing if the entity is not registered. */
755 if (mdev == NULL)
756 return;
757
758 mutex_lock(&mdev->graph_mutex);
759 __media_entity_remove_links(entity);
760 mutex_unlock(&mdev->graph_mutex);
761}
762EXPORT_SYMBOL_GPL(media_entity_remove_links);
763
764static int __media_entity_setup_link_notify(struct media_link *link, u32 flags)
765{
766 int ret;
767
768 /* Notify both entities. */
769 ret = media_entity_call(link->source->entity, link_setup,
770 link->source, link->sink, flags);
771 if (ret < 0 && ret != -ENOIOCTLCMD)
772 return ret;
773
774 ret = media_entity_call(link->sink->entity, link_setup,
775 link->sink, link->source, flags);
776 if (ret < 0 && ret != -ENOIOCTLCMD) {
777 media_entity_call(link->source->entity, link_setup,
778 link->source, link->sink, link->flags);
779 return ret;
780 }
781
782 link->flags = flags;
783 link->reverse->flags = link->flags;
784
785 return 0;
786}
787
788int __media_entity_setup_link(struct media_link *link, u32 flags)
789{
790 const u32 mask = MEDIA_LNK_FL_ENABLED;
791 struct media_device *mdev;
792 struct media_entity *source, *sink;
793 int ret = -EBUSY;
794
795 if (link == NULL)
796 return -EINVAL;
797
798 /* The non-modifiable link flags must not be modified. */
799 if ((link->flags & ~mask) != (flags & ~mask))
800 return -EINVAL;
801
802 if (link->flags & MEDIA_LNK_FL_IMMUTABLE)
803 return link->flags == flags ? 0 : -EINVAL;
804
805 if (link->flags == flags)
806 return 0;
807
808 source = link->source->entity;
809 sink = link->sink->entity;
810
811 if (!(link->flags & MEDIA_LNK_FL_DYNAMIC) &&
812 (source->stream_count || sink->stream_count))
813 return -EBUSY;
814
815 mdev = source->graph_obj.mdev;
816
817 if (mdev->ops && mdev->ops->link_notify) {
818 ret = mdev->ops->link_notify(link, flags,
819 MEDIA_DEV_NOTIFY_PRE_LINK_CH);
820 if (ret < 0)
821 return ret;
822 }
823
824 ret = __media_entity_setup_link_notify(link, flags);
825
826 if (mdev->ops && mdev->ops->link_notify)
827 mdev->ops->link_notify(link, flags,
828 MEDIA_DEV_NOTIFY_POST_LINK_CH);
829
830 return ret;
831}
832EXPORT_SYMBOL_GPL(__media_entity_setup_link);
833
834int media_entity_setup_link(struct media_link *link, u32 flags)
835{
836 int ret;
837
838 mutex_lock(&link->graph_obj.mdev->graph_mutex);
839 ret = __media_entity_setup_link(link, flags);
840 mutex_unlock(&link->graph_obj.mdev->graph_mutex);
841
842 return ret;
843}
844EXPORT_SYMBOL_GPL(media_entity_setup_link);
845
846struct media_link *
847media_entity_find_link(struct media_pad *source, struct media_pad *sink)
848{
849 struct media_link *link;
850
851 list_for_each_entry(link, &source->entity->links, list) {
852 if (link->source->entity == source->entity &&
853 link->source->index == source->index &&
854 link->sink->entity == sink->entity &&
855 link->sink->index == sink->index)
856 return link;
857 }
858
859 return NULL;
860}
861EXPORT_SYMBOL_GPL(media_entity_find_link);
862
863struct media_pad *media_entity_remote_pad(struct media_pad *pad)
864{
865 struct media_link *link;
866
867 list_for_each_entry(link, &pad->entity->links, list) {
868 if (!(link->flags & MEDIA_LNK_FL_ENABLED))
869 continue;
870
871 if (link->source == pad)
872 return link->sink;
873
874 if (link->sink == pad)
875 return link->source;
876 }
877
878 return NULL;
879
880}
881EXPORT_SYMBOL_GPL(media_entity_remote_pad);
882
883static void media_interface_init(struct media_device *mdev,
884 struct media_interface *intf,
885 u32 gobj_type,
886 u32 intf_type, u32 flags)
887{
888 intf->type = intf_type;
889 intf->flags = flags;
890 INIT_LIST_HEAD(&intf->links);
891
892 media_gobj_create(mdev, gobj_type, &intf->graph_obj);
893}
894
895/* Functions related to the media interface via device nodes */
896
897struct media_intf_devnode *media_devnode_create(struct media_device *mdev,
898 u32 type, u32 flags,
899 u32 major, u32 minor)
900{
901 struct media_intf_devnode *devnode;
902
903 devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
904 if (!devnode)
905 return NULL;
906
907 devnode->major = major;
908 devnode->minor = minor;
909
910 media_interface_init(mdev, &devnode->intf, MEDIA_GRAPH_INTF_DEVNODE,
911 type, flags);
912
913 return devnode;
914}
915EXPORT_SYMBOL_GPL(media_devnode_create);
916
917void media_devnode_remove(struct media_intf_devnode *devnode)
918{
919 media_remove_intf_links(&devnode->intf);
920 media_gobj_destroy(&devnode->intf.graph_obj);
921 kfree(devnode);
922}
923EXPORT_SYMBOL_GPL(media_devnode_remove);
924
925struct media_link *media_create_intf_link(struct media_entity *entity,
926 struct media_interface *intf,
927 u32 flags)
928{
929 struct media_link *link;
930
931 link = media_add_link(&intf->links);
932 if (link == NULL)
933 return NULL;
934
935 link->intf = intf;
936 link->entity = entity;
937 link->flags = flags | MEDIA_LNK_FL_INTERFACE_LINK;
938
939 /* Initialize graph object embedded at the new link */
940 media_gobj_create(intf->graph_obj.mdev, MEDIA_GRAPH_LINK,
941 &link->graph_obj);
942
943 return link;
944}
945EXPORT_SYMBOL_GPL(media_create_intf_link);
946
947void __media_remove_intf_link(struct media_link *link)
948{
949 list_del(&link->list);
950 media_gobj_destroy(&link->graph_obj);
951 kfree(link);
952}
953EXPORT_SYMBOL_GPL(__media_remove_intf_link);
954
955void media_remove_intf_link(struct media_link *link)
956{
957 struct media_device *mdev = link->graph_obj.mdev;
958
959 /* Do nothing if the intf is not registered. */
960 if (mdev == NULL)
961 return;
962
963 mutex_lock(&mdev->graph_mutex);
964 __media_remove_intf_link(link);
965 mutex_unlock(&mdev->graph_mutex);
966}
967EXPORT_SYMBOL_GPL(media_remove_intf_link);
968
969void __media_remove_intf_links(struct media_interface *intf)
970{
971 struct media_link *link, *tmp;
972
973 list_for_each_entry_safe(link, tmp, &intf->links, list)
974 __media_remove_intf_link(link);
975
976}
977EXPORT_SYMBOL_GPL(__media_remove_intf_links);
978
979void media_remove_intf_links(struct media_interface *intf)
980{
981 struct media_device *mdev = intf->graph_obj.mdev;
982
983 /* Do nothing if the intf is not registered. */
984 if (mdev == NULL)
985 return;
986
987 mutex_lock(&mdev->graph_mutex);
988 __media_remove_intf_links(intf);
989 mutex_unlock(&mdev->graph_mutex);
990}
991EXPORT_SYMBOL_GPL(media_remove_intf_links);