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Commit | Line | Data |
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53e269c1 LP |
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 | ||
5c7b25b9 | 23 | #include <linux/bitmap.h> |
53e269c1 LP |
24 | #include <linux/module.h> |
25 | #include <linux/slab.h> | |
26 | #include <media/media-entity.h> | |
503c3d82 | 27 | #include <media/media-device.h> |
53e269c1 | 28 | |
39a956c4 MCC |
29 | static 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"; | |
27e543fa MCC |
38 | case MEDIA_GRAPH_INTF_DEVNODE: |
39 | return "intf-devnode"; | |
39a956c4 MCC |
40 | default: |
41 | return "unknown"; | |
42 | } | |
43 | } | |
44 | ||
27e543fa MCC |
45 | static inline const char *intf_type(struct media_interface *intf) |
46 | { | |
47 | switch (intf->type) { | |
48 | case MEDIA_INTF_T_DVB_FE: | |
49 | return "frontend"; | |
50 | case MEDIA_INTF_T_DVB_DEMUX: | |
51 | return "demux"; | |
52 | case MEDIA_INTF_T_DVB_DVR: | |
53 | return "DVR"; | |
54 | case MEDIA_INTF_T_DVB_CA: | |
55 | return "CA"; | |
56 | case MEDIA_INTF_T_DVB_NET: | |
57 | return "dvbnet"; | |
58 | case MEDIA_INTF_T_V4L_VIDEO: | |
59 | return "video"; | |
60 | case MEDIA_INTF_T_V4L_VBI: | |
61 | return "vbi"; | |
62 | case MEDIA_INTF_T_V4L_RADIO: | |
63 | return "radio"; | |
64 | case MEDIA_INTF_T_V4L_SUBDEV: | |
65 | return "v4l2-subdev"; | |
66 | case MEDIA_INTF_T_V4L_SWRADIO: | |
67 | return "swradio"; | |
68 | default: | |
69 | return "unknown-intf"; | |
70 | } | |
71 | }; | |
72 | ||
1fc25d30 MCC |
73 | /** |
74 | * dev_dbg_obj - Prints in debug mode a change on some object | |
75 | * | |
76 | * @event_name: Name of the event to report. Could be __func__ | |
77 | * @gobj: Pointer to the object | |
78 | * | |
79 | * Enabled only if DEBUG or CONFIG_DYNAMIC_DEBUG. Otherwise, it | |
80 | * won't produce any code. | |
81 | */ | |
39a956c4 MCC |
82 | static void dev_dbg_obj(const char *event_name, struct media_gobj *gobj) |
83 | { | |
84 | #if defined(DEBUG) || defined (CONFIG_DYNAMIC_DEBUG) | |
85 | switch (media_type(gobj)) { | |
86 | case MEDIA_GRAPH_ENTITY: | |
87 | dev_dbg(gobj->mdev->dev, | |
88 | "%s: id 0x%08x entity#%d: '%s'\n", | |
89 | event_name, gobj->id, media_localid(gobj), | |
90 | gobj_to_entity(gobj)->name); | |
91 | break; | |
92 | case MEDIA_GRAPH_LINK: | |
93 | { | |
94 | struct media_link *link = gobj_to_link(gobj); | |
95 | ||
96 | dev_dbg(gobj->mdev->dev, | |
3c0e266f | 97 | "%s: id 0x%08x link#%d: %s#%d ==> %s#%d\n", |
39a956c4 MCC |
98 | event_name, gobj->id, media_localid(gobj), |
99 | ||
3c0e266f MCC |
100 | gobj_type(media_type(link->gobj0)), |
101 | media_localid(link->gobj0), | |
39a956c4 | 102 | |
3c0e266f MCC |
103 | gobj_type(media_type(link->gobj1)), |
104 | media_localid(link->gobj1)); | |
39a956c4 MCC |
105 | break; |
106 | } | |
107 | case MEDIA_GRAPH_PAD: | |
108 | { | |
109 | struct media_pad *pad = gobj_to_pad(gobj); | |
110 | ||
111 | dev_dbg(gobj->mdev->dev, | |
6c24d460 MCC |
112 | "%s: id 0x%08x %s%spad#%d: '%s':%d\n", |
113 | event_name, gobj->id, | |
114 | pad->flags & MEDIA_PAD_FL_SINK ? " sink " : "", | |
115 | pad->flags & MEDIA_PAD_FL_SOURCE ? "source " : "", | |
116 | media_localid(gobj), | |
39a956c4 | 117 | pad->entity->name, pad->index); |
27e543fa MCC |
118 | break; |
119 | } | |
120 | case MEDIA_GRAPH_INTF_DEVNODE: | |
121 | { | |
122 | struct media_interface *intf = gobj_to_intf(gobj); | |
123 | struct media_intf_devnode *devnode = intf_to_devnode(intf); | |
124 | ||
125 | dev_dbg(gobj->mdev->dev, | |
126 | "%s: id 0x%08x intf_devnode#%d: %s - major: %d, minor: %d\n", | |
127 | event_name, gobj->id, media_localid(gobj), | |
128 | intf_type(intf), | |
129 | devnode->major, devnode->minor); | |
130 | break; | |
39a956c4 MCC |
131 | } |
132 | } | |
133 | #endif | |
134 | } | |
135 | ||
c350ef83 | 136 | void media_gobj_create(struct media_device *mdev, |
ec6e4c95 MCC |
137 | enum media_gobj_type type, |
138 | struct media_gobj *gobj) | |
139 | { | |
8f6d368f MCC |
140 | BUG_ON(!mdev); |
141 | ||
39a956c4 MCC |
142 | gobj->mdev = mdev; |
143 | ||
bfab2aac MCC |
144 | /* Create a per-type unique object ID */ |
145 | switch (type) { | |
146 | case MEDIA_GRAPH_ENTITY: | |
147 | gobj->id = media_gobj_gen_id(type, ++mdev->entity_id); | |
05bfa9fa | 148 | list_add_tail(&gobj->list, &mdev->entities); |
bfab2aac | 149 | break; |
18710dc6 MCC |
150 | case MEDIA_GRAPH_PAD: |
151 | gobj->id = media_gobj_gen_id(type, ++mdev->pad_id); | |
9155d859 | 152 | list_add_tail(&gobj->list, &mdev->pads); |
18710dc6 | 153 | break; |
6b6a4278 MCC |
154 | case MEDIA_GRAPH_LINK: |
155 | gobj->id = media_gobj_gen_id(type, ++mdev->link_id); | |
9155d859 | 156 | list_add_tail(&gobj->list, &mdev->links); |
6b6a4278 | 157 | break; |
27e543fa MCC |
158 | case MEDIA_GRAPH_INTF_DEVNODE: |
159 | gobj->id = media_gobj_gen_id(type, ++mdev->intf_devnode_id); | |
9155d859 | 160 | list_add_tail(&gobj->list, &mdev->interfaces); |
27e543fa | 161 | break; |
bfab2aac | 162 | } |
2521fdac MCC |
163 | |
164 | mdev->topology_version++; | |
165 | ||
39a956c4 | 166 | dev_dbg_obj(__func__, gobj); |
ec6e4c95 MCC |
167 | } |
168 | ||
c350ef83 | 169 | void media_gobj_destroy(struct media_gobj *gobj) |
ec6e4c95 | 170 | { |
39a956c4 | 171 | dev_dbg_obj(__func__, gobj); |
9155d859 | 172 | |
2521fdac MCC |
173 | gobj->mdev->topology_version++; |
174 | ||
9155d859 MCC |
175 | /* Remove the object from mdev list */ |
176 | list_del(&gobj->list); | |
ec6e4c95 MCC |
177 | } |
178 | ||
1fc25d30 MCC |
179 | int media_entity_pads_init(struct media_entity *entity, u16 num_pads, |
180 | struct media_pad *pads) | |
53e269c1 | 181 | { |
db141a35 | 182 | struct media_device *mdev = entity->graph_obj.mdev; |
53e269c1 LP |
183 | unsigned int i; |
184 | ||
53e269c1 LP |
185 | entity->num_pads = num_pads; |
186 | entity->pads = pads; | |
53e269c1 | 187 | |
db141a35 JMC |
188 | if (mdev) |
189 | spin_lock(&mdev->lock); | |
190 | ||
53e269c1 LP |
191 | for (i = 0; i < num_pads; i++) { |
192 | pads[i].entity = entity; | |
193 | pads[i].index = i; | |
db141a35 | 194 | if (mdev) |
c350ef83 | 195 | media_gobj_create(mdev, MEDIA_GRAPH_PAD, |
db141a35 | 196 | &entity->pads[i].graph_obj); |
53e269c1 LP |
197 | } |
198 | ||
db141a35 JMC |
199 | if (mdev) |
200 | spin_unlock(&mdev->lock); | |
201 | ||
53e269c1 LP |
202 | return 0; |
203 | } | |
ab22e77c | 204 | EXPORT_SYMBOL_GPL(media_entity_pads_init); |
53e269c1 | 205 | |
a5ccc48a SA |
206 | /* ----------------------------------------------------------------------------- |
207 | * Graph traversal | |
208 | */ | |
209 | ||
210 | static struct media_entity * | |
211 | media_entity_other(struct media_entity *entity, struct media_link *link) | |
212 | { | |
213 | if (link->source->entity == entity) | |
214 | return link->sink->entity; | |
215 | else | |
216 | return link->source->entity; | |
217 | } | |
218 | ||
219 | /* push an entity to traversal stack */ | |
220 | static void stack_push(struct media_entity_graph *graph, | |
221 | struct media_entity *entity) | |
222 | { | |
223 | if (graph->top == MEDIA_ENTITY_ENUM_MAX_DEPTH - 1) { | |
224 | WARN_ON(1); | |
225 | return; | |
226 | } | |
227 | graph->top++; | |
313895fb | 228 | graph->stack[graph->top].link = entity->links.next; |
a5ccc48a SA |
229 | graph->stack[graph->top].entity = entity; |
230 | } | |
231 | ||
232 | static struct media_entity *stack_pop(struct media_entity_graph *graph) | |
233 | { | |
234 | struct media_entity *entity; | |
235 | ||
236 | entity = graph->stack[graph->top].entity; | |
237 | graph->top--; | |
238 | ||
239 | return entity; | |
240 | } | |
241 | ||
a5ccc48a SA |
242 | #define link_top(en) ((en)->stack[(en)->top].link) |
243 | #define stack_top(en) ((en)->stack[(en)->top].entity) | |
244 | ||
a5ccc48a SA |
245 | void media_entity_graph_walk_start(struct media_entity_graph *graph, |
246 | struct media_entity *entity) | |
247 | { | |
248 | graph->top = 0; | |
249 | graph->stack[graph->top].entity = NULL; | |
5c7b25b9 LP |
250 | bitmap_zero(graph->entities, MEDIA_ENTITY_ENUM_MAX_ID); |
251 | ||
fa762394 | 252 | if (WARN_ON(media_entity_id(entity) >= MEDIA_ENTITY_ENUM_MAX_ID)) |
5c7b25b9 LP |
253 | return; |
254 | ||
fa762394 | 255 | __set_bit(media_entity_id(entity), graph->entities); |
a5ccc48a SA |
256 | stack_push(graph, entity); |
257 | } | |
258 | EXPORT_SYMBOL_GPL(media_entity_graph_walk_start); | |
259 | ||
a5ccc48a SA |
260 | struct media_entity * |
261 | media_entity_graph_walk_next(struct media_entity_graph *graph) | |
262 | { | |
263 | if (stack_top(graph) == NULL) | |
264 | return NULL; | |
265 | ||
266 | /* | |
267 | * Depth first search. Push entity to stack and continue from | |
268 | * top of the stack until no more entities on the level can be | |
269 | * found. | |
270 | */ | |
313895fb | 271 | while (link_top(graph) != &stack_top(graph)->links) { |
a5ccc48a | 272 | struct media_entity *entity = stack_top(graph); |
57208e5e | 273 | struct media_link *link; |
a5ccc48a SA |
274 | struct media_entity *next; |
275 | ||
57208e5e MCC |
276 | link = list_entry(link_top(graph), typeof(*link), list); |
277 | ||
a5ccc48a SA |
278 | /* The link is not enabled so we do not follow. */ |
279 | if (!(link->flags & MEDIA_LNK_FL_ENABLED)) { | |
57208e5e | 280 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
281 | continue; |
282 | } | |
283 | ||
284 | /* Get the entity in the other end of the link . */ | |
285 | next = media_entity_other(entity, link); | |
fa762394 | 286 | if (WARN_ON(media_entity_id(next) >= MEDIA_ENTITY_ENUM_MAX_ID)) |
5c7b25b9 | 287 | return NULL; |
a5ccc48a | 288 | |
5c7b25b9 | 289 | /* Has the entity already been visited? */ |
fa762394 | 290 | if (__test_and_set_bit(media_entity_id(next), graph->entities)) { |
57208e5e | 291 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
292 | continue; |
293 | } | |
294 | ||
295 | /* Push the new entity to stack and start over. */ | |
57208e5e | 296 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
297 | stack_push(graph, next); |
298 | } | |
299 | ||
300 | return stack_pop(graph); | |
301 | } | |
302 | EXPORT_SYMBOL_GPL(media_entity_graph_walk_next); | |
303 | ||
e02188c9 LP |
304 | /* ----------------------------------------------------------------------------- |
305 | * Pipeline management | |
306 | */ | |
307 | ||
af88be38 SA |
308 | __must_check int media_entity_pipeline_start(struct media_entity *entity, |
309 | struct media_pipeline *pipe) | |
e02188c9 | 310 | { |
d10c9894 | 311 | struct media_device *mdev = entity->graph_obj.mdev; |
e02188c9 | 312 | struct media_entity_graph graph; |
af88be38 | 313 | struct media_entity *entity_err = entity; |
57208e5e | 314 | struct media_link *link; |
af88be38 | 315 | int ret; |
e02188c9 LP |
316 | |
317 | mutex_lock(&mdev->graph_mutex); | |
318 | ||
319 | media_entity_graph_walk_start(&graph, entity); | |
320 | ||
321 | while ((entity = media_entity_graph_walk_next(&graph))) { | |
ef69ee1b MCC |
322 | DECLARE_BITMAP(active, MEDIA_ENTITY_MAX_PADS); |
323 | DECLARE_BITMAP(has_no_links, MEDIA_ENTITY_MAX_PADS); | |
af88be38 | 324 | |
e02188c9 | 325 | entity->stream_count++; |
8aaf62b5 SA |
326 | |
327 | if (WARN_ON(entity->pipe && entity->pipe != pipe)) { | |
328 | ret = -EBUSY; | |
329 | goto error; | |
330 | } | |
331 | ||
e02188c9 | 332 | entity->pipe = pipe; |
af88be38 SA |
333 | |
334 | /* Already streaming --- no need to check. */ | |
335 | if (entity->stream_count > 1) | |
336 | continue; | |
337 | ||
338 | if (!entity->ops || !entity->ops->link_validate) | |
339 | continue; | |
340 | ||
de49c285 SA |
341 | bitmap_zero(active, entity->num_pads); |
342 | bitmap_fill(has_no_links, entity->num_pads); | |
343 | ||
57208e5e | 344 | list_for_each_entry(link, &entity->links, list) { |
de49c285 SA |
345 | struct media_pad *pad = link->sink->entity == entity |
346 | ? link->sink : link->source; | |
347 | ||
348 | /* Mark that a pad is connected by a link. */ | |
349 | bitmap_clear(has_no_links, pad->index, 1); | |
350 | ||
351 | /* | |
352 | * Pads that either do not need to connect or | |
353 | * are connected through an enabled link are | |
354 | * fine. | |
355 | */ | |
356 | if (!(pad->flags & MEDIA_PAD_FL_MUST_CONNECT) || | |
357 | link->flags & MEDIA_LNK_FL_ENABLED) | |
358 | bitmap_set(active, pad->index, 1); | |
359 | ||
360 | /* | |
361 | * Link validation will only take place for | |
362 | * sink ends of the link that are enabled. | |
363 | */ | |
364 | if (link->sink != pad || | |
365 | !(link->flags & MEDIA_LNK_FL_ENABLED)) | |
af88be38 SA |
366 | continue; |
367 | ||
368 | ret = entity->ops->link_validate(link); | |
fab9d30b | 369 | if (ret < 0 && ret != -ENOIOCTLCMD) { |
d10c9894 | 370 | dev_dbg(entity->graph_obj.mdev->dev, |
fab9d30b | 371 | "link validation failed for \"%s\":%u -> \"%s\":%u, error %d\n", |
823ea2a6 SA |
372 | link->source->entity->name, |
373 | link->source->index, | |
374 | entity->name, link->sink->index, ret); | |
af88be38 | 375 | goto error; |
fab9d30b | 376 | } |
af88be38 | 377 | } |
de49c285 SA |
378 | |
379 | /* Either no links or validated links are fine. */ | |
380 | bitmap_or(active, active, has_no_links, entity->num_pads); | |
381 | ||
382 | if (!bitmap_full(active, entity->num_pads)) { | |
383 | ret = -EPIPE; | |
d10c9894 | 384 | dev_dbg(entity->graph_obj.mdev->dev, |
fab9d30b SA |
385 | "\"%s\":%u must be connected by an enabled link\n", |
386 | entity->name, | |
094f1ca5 SA |
387 | (unsigned)find_first_zero_bit( |
388 | active, entity->num_pads)); | |
de49c285 SA |
389 | goto error; |
390 | } | |
e02188c9 LP |
391 | } |
392 | ||
393 | mutex_unlock(&mdev->graph_mutex); | |
af88be38 SA |
394 | |
395 | return 0; | |
396 | ||
397 | error: | |
398 | /* | |
399 | * Link validation on graph failed. We revert what we did and | |
400 | * return the error. | |
401 | */ | |
402 | media_entity_graph_walk_start(&graph, entity_err); | |
403 | ||
404 | while ((entity_err = media_entity_graph_walk_next(&graph))) { | |
405 | entity_err->stream_count--; | |
406 | if (entity_err->stream_count == 0) | |
407 | entity_err->pipe = NULL; | |
408 | ||
409 | /* | |
410 | * We haven't increased stream_count further than this | |
411 | * so we quit here. | |
412 | */ | |
413 | if (entity_err == entity) | |
414 | break; | |
415 | } | |
416 | ||
417 | mutex_unlock(&mdev->graph_mutex); | |
418 | ||
419 | return ret; | |
e02188c9 LP |
420 | } |
421 | EXPORT_SYMBOL_GPL(media_entity_pipeline_start); | |
422 | ||
e02188c9 LP |
423 | void media_entity_pipeline_stop(struct media_entity *entity) |
424 | { | |
d10c9894 | 425 | struct media_device *mdev = entity->graph_obj.mdev; |
e02188c9 LP |
426 | struct media_entity_graph graph; |
427 | ||
428 | mutex_lock(&mdev->graph_mutex); | |
429 | ||
430 | media_entity_graph_walk_start(&graph, entity); | |
431 | ||
432 | while ((entity = media_entity_graph_walk_next(&graph))) { | |
433 | entity->stream_count--; | |
434 | if (entity->stream_count == 0) | |
435 | entity->pipe = NULL; | |
436 | } | |
437 | ||
438 | mutex_unlock(&mdev->graph_mutex); | |
439 | } | |
440 | EXPORT_SYMBOL_GPL(media_entity_pipeline_stop); | |
441 | ||
503c3d82 LP |
442 | /* ----------------------------------------------------------------------------- |
443 | * Module use count | |
444 | */ | |
445 | ||
503c3d82 LP |
446 | struct media_entity *media_entity_get(struct media_entity *entity) |
447 | { | |
448 | if (entity == NULL) | |
449 | return NULL; | |
450 | ||
d10c9894 JMC |
451 | if (entity->graph_obj.mdev->dev && |
452 | !try_module_get(entity->graph_obj.mdev->dev->driver->owner)) | |
503c3d82 LP |
453 | return NULL; |
454 | ||
455 | return entity; | |
456 | } | |
457 | EXPORT_SYMBOL_GPL(media_entity_get); | |
458 | ||
503c3d82 LP |
459 | void media_entity_put(struct media_entity *entity) |
460 | { | |
461 | if (entity == NULL) | |
462 | return; | |
463 | ||
d10c9894 JMC |
464 | if (entity->graph_obj.mdev->dev) |
465 | module_put(entity->graph_obj.mdev->dev->driver->owner); | |
503c3d82 LP |
466 | } |
467 | EXPORT_SYMBOL_GPL(media_entity_put); | |
468 | ||
a5ccc48a SA |
469 | /* ----------------------------------------------------------------------------- |
470 | * Links management | |
471 | */ | |
472 | ||
23615de5 | 473 | static struct media_link *media_add_link(struct list_head *head) |
53e269c1 | 474 | { |
57208e5e | 475 | struct media_link *link; |
53e269c1 | 476 | |
57208e5e MCC |
477 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
478 | if (link == NULL) | |
479 | return NULL; | |
53e269c1 | 480 | |
23615de5 | 481 | list_add_tail(&link->list, head); |
53e269c1 | 482 | |
57208e5e | 483 | return link; |
53e269c1 LP |
484 | } |
485 | ||
57208e5e | 486 | static void __media_entity_remove_link(struct media_entity *entity, |
5abad22f MCC |
487 | struct media_link *link) |
488 | { | |
489 | struct media_link *rlink, *tmp; | |
490 | struct media_entity *remote; | |
5abad22f MCC |
491 | |
492 | if (link->source->entity == entity) | |
493 | remote = link->sink->entity; | |
494 | else | |
495 | remote = link->source->entity; | |
496 | ||
497 | list_for_each_entry_safe(rlink, tmp, &remote->links, list) { | |
58f69ee9 | 498 | if (rlink != link->reverse) |
5abad22f | 499 | continue; |
5abad22f MCC |
500 | |
501 | if (link->source->entity == entity) | |
502 | remote->num_backlinks--; | |
503 | ||
504 | /* Remove the remote link */ | |
505 | list_del(&rlink->list); | |
c350ef83 | 506 | media_gobj_destroy(&rlink->graph_obj); |
5abad22f MCC |
507 | kfree(rlink); |
508 | ||
509 | if (--remote->num_links == 0) | |
510 | break; | |
511 | } | |
512 | list_del(&link->list); | |
c350ef83 | 513 | media_gobj_destroy(&link->graph_obj); |
5abad22f MCC |
514 | kfree(link); |
515 | } | |
57208e5e | 516 | |
53e269c1 | 517 | int |
8df00a15 | 518 | media_create_pad_link(struct media_entity *source, u16 source_pad, |
53e269c1 LP |
519 | struct media_entity *sink, u16 sink_pad, u32 flags) |
520 | { | |
521 | struct media_link *link; | |
522 | struct media_link *backlink; | |
523 | ||
524 | BUG_ON(source == NULL || sink == NULL); | |
525 | BUG_ON(source_pad >= source->num_pads); | |
526 | BUG_ON(sink_pad >= sink->num_pads); | |
527 | ||
23615de5 | 528 | link = media_add_link(&source->links); |
53e269c1 LP |
529 | if (link == NULL) |
530 | return -ENOMEM; | |
531 | ||
532 | link->source = &source->pads[source_pad]; | |
533 | link->sink = &sink->pads[sink_pad]; | |
82ae2a50 | 534 | link->flags = flags & ~MEDIA_LNK_FL_INTERFACE_LINK; |
53e269c1 | 535 | |
6b6a4278 | 536 | /* Initialize graph object embedded at the new link */ |
c350ef83 | 537 | media_gobj_create(source->graph_obj.mdev, MEDIA_GRAPH_LINK, |
d10c9894 | 538 | &link->graph_obj); |
6b6a4278 | 539 | |
53e269c1 LP |
540 | /* Create the backlink. Backlinks are used to help graph traversal and |
541 | * are not reported to userspace. | |
542 | */ | |
23615de5 | 543 | backlink = media_add_link(&sink->links); |
53e269c1 | 544 | if (backlink == NULL) { |
57208e5e | 545 | __media_entity_remove_link(source, link); |
53e269c1 LP |
546 | return -ENOMEM; |
547 | } | |
548 | ||
549 | backlink->source = &source->pads[source_pad]; | |
550 | backlink->sink = &sink->pads[sink_pad]; | |
551 | backlink->flags = flags; | |
39d1ebc6 | 552 | backlink->is_backlink = true; |
53e269c1 | 553 | |
6b6a4278 | 554 | /* Initialize graph object embedded at the new link */ |
c350ef83 | 555 | media_gobj_create(sink->graph_obj.mdev, MEDIA_GRAPH_LINK, |
d10c9894 | 556 | &backlink->graph_obj); |
6b6a4278 | 557 | |
53e269c1 LP |
558 | link->reverse = backlink; |
559 | backlink->reverse = link; | |
560 | ||
561 | sink->num_backlinks++; | |
57208e5e MCC |
562 | sink->num_links++; |
563 | source->num_links++; | |
53e269c1 LP |
564 | |
565 | return 0; | |
566 | } | |
8df00a15 | 567 | EXPORT_SYMBOL_GPL(media_create_pad_link); |
97548ed4 | 568 | |
57208e5e MCC |
569 | void __media_entity_remove_links(struct media_entity *entity) |
570 | { | |
571 | struct media_link *link, *tmp; | |
7349cec1 | 572 | |
57208e5e MCC |
573 | list_for_each_entry_safe(link, tmp, &entity->links, list) |
574 | __media_entity_remove_link(entity, link); | |
7349cec1 SN |
575 | |
576 | entity->num_links = 0; | |
577 | entity->num_backlinks = 0; | |
578 | } | |
579 | EXPORT_SYMBOL_GPL(__media_entity_remove_links); | |
580 | ||
581 | void media_entity_remove_links(struct media_entity *entity) | |
582 | { | |
583 | /* Do nothing if the entity is not registered. */ | |
d10c9894 | 584 | if (entity->graph_obj.mdev == NULL) |
7349cec1 SN |
585 | return; |
586 | ||
a08fad1e | 587 | spin_lock(&entity->graph_obj.mdev->lock); |
7349cec1 | 588 | __media_entity_remove_links(entity); |
a08fad1e | 589 | spin_unlock(&entity->graph_obj.mdev->lock); |
7349cec1 SN |
590 | } |
591 | EXPORT_SYMBOL_GPL(media_entity_remove_links); | |
592 | ||
97548ed4 LP |
593 | static int __media_entity_setup_link_notify(struct media_link *link, u32 flags) |
594 | { | |
97548ed4 LP |
595 | int ret; |
596 | ||
597 | /* Notify both entities. */ | |
598 | ret = media_entity_call(link->source->entity, link_setup, | |
599 | link->source, link->sink, flags); | |
600 | if (ret < 0 && ret != -ENOIOCTLCMD) | |
601 | return ret; | |
602 | ||
603 | ret = media_entity_call(link->sink->entity, link_setup, | |
604 | link->sink, link->source, flags); | |
605 | if (ret < 0 && ret != -ENOIOCTLCMD) { | |
606 | media_entity_call(link->source->entity, link_setup, | |
607 | link->source, link->sink, link->flags); | |
608 | return ret; | |
609 | } | |
610 | ||
7a6f0b22 | 611 | link->flags = flags; |
97548ed4 LP |
612 | link->reverse->flags = link->flags; |
613 | ||
614 | return 0; | |
615 | } | |
616 | ||
97548ed4 LP |
617 | int __media_entity_setup_link(struct media_link *link, u32 flags) |
618 | { | |
7a6f0b22 | 619 | const u32 mask = MEDIA_LNK_FL_ENABLED; |
97548ed4 LP |
620 | struct media_device *mdev; |
621 | struct media_entity *source, *sink; | |
622 | int ret = -EBUSY; | |
623 | ||
624 | if (link == NULL) | |
625 | return -EINVAL; | |
626 | ||
7a6f0b22 LP |
627 | /* The non-modifiable link flags must not be modified. */ |
628 | if ((link->flags & ~mask) != (flags & ~mask)) | |
629 | return -EINVAL; | |
630 | ||
97548ed4 LP |
631 | if (link->flags & MEDIA_LNK_FL_IMMUTABLE) |
632 | return link->flags == flags ? 0 : -EINVAL; | |
633 | ||
634 | if (link->flags == flags) | |
635 | return 0; | |
636 | ||
637 | source = link->source->entity; | |
638 | sink = link->sink->entity; | |
639 | ||
e02188c9 LP |
640 | if (!(link->flags & MEDIA_LNK_FL_DYNAMIC) && |
641 | (source->stream_count || sink->stream_count)) | |
642 | return -EBUSY; | |
643 | ||
d10c9894 | 644 | mdev = source->graph_obj.mdev; |
97548ed4 | 645 | |
813f5c0a SN |
646 | if (mdev->link_notify) { |
647 | ret = mdev->link_notify(link, flags, | |
648 | MEDIA_DEV_NOTIFY_PRE_LINK_CH); | |
97548ed4 LP |
649 | if (ret < 0) |
650 | return ret; | |
651 | } | |
652 | ||
653 | ret = __media_entity_setup_link_notify(link, flags); | |
97548ed4 | 654 | |
813f5c0a SN |
655 | if (mdev->link_notify) |
656 | mdev->link_notify(link, flags, MEDIA_DEV_NOTIFY_POST_LINK_CH); | |
97548ed4 LP |
657 | |
658 | return ret; | |
659 | } | |
660 | ||
661 | int media_entity_setup_link(struct media_link *link, u32 flags) | |
662 | { | |
663 | int ret; | |
664 | ||
5c883edb | 665 | mutex_lock(&link->graph_obj.mdev->graph_mutex); |
97548ed4 | 666 | ret = __media_entity_setup_link(link, flags); |
5c883edb | 667 | mutex_unlock(&link->graph_obj.mdev->graph_mutex); |
97548ed4 LP |
668 | |
669 | return ret; | |
670 | } | |
671 | EXPORT_SYMBOL_GPL(media_entity_setup_link); | |
672 | ||
97548ed4 LP |
673 | struct media_link * |
674 | media_entity_find_link(struct media_pad *source, struct media_pad *sink) | |
675 | { | |
676 | struct media_link *link; | |
97548ed4 | 677 | |
57208e5e | 678 | list_for_each_entry(link, &source->entity->links, list) { |
97548ed4 LP |
679 | if (link->source->entity == source->entity && |
680 | link->source->index == source->index && | |
681 | link->sink->entity == sink->entity && | |
682 | link->sink->index == sink->index) | |
683 | return link; | |
684 | } | |
685 | ||
686 | return NULL; | |
687 | } | |
688 | EXPORT_SYMBOL_GPL(media_entity_find_link); | |
689 | ||
1bddf1b3 | 690 | struct media_pad *media_entity_remote_pad(struct media_pad *pad) |
97548ed4 | 691 | { |
57208e5e | 692 | struct media_link *link; |
97548ed4 | 693 | |
57208e5e | 694 | list_for_each_entry(link, &pad->entity->links, list) { |
97548ed4 LP |
695 | if (!(link->flags & MEDIA_LNK_FL_ENABLED)) |
696 | continue; | |
697 | ||
698 | if (link->source == pad) | |
699 | return link->sink; | |
700 | ||
701 | if (link->sink == pad) | |
702 | return link->source; | |
703 | } | |
704 | ||
705 | return NULL; | |
706 | ||
707 | } | |
1bddf1b3 | 708 | EXPORT_SYMBOL_GPL(media_entity_remote_pad); |
27e543fa | 709 | |
1283f849 MCC |
710 | static void media_interface_init(struct media_device *mdev, |
711 | struct media_interface *intf, | |
712 | u32 gobj_type, | |
713 | u32 intf_type, u32 flags) | |
714 | { | |
715 | intf->type = intf_type; | |
716 | intf->flags = flags; | |
717 | INIT_LIST_HEAD(&intf->links); | |
718 | ||
c350ef83 | 719 | media_gobj_create(mdev, gobj_type, &intf->graph_obj); |
1283f849 MCC |
720 | } |
721 | ||
27e543fa MCC |
722 | /* Functions related to the media interface via device nodes */ |
723 | ||
724 | struct media_intf_devnode *media_devnode_create(struct media_device *mdev, | |
725 | u32 type, u32 flags, | |
0b3b72df | 726 | u32 major, u32 minor) |
27e543fa MCC |
727 | { |
728 | struct media_intf_devnode *devnode; | |
27e543fa | 729 | |
0b3b72df | 730 | devnode = kzalloc(sizeof(*devnode), GFP_KERNEL); |
27e543fa MCC |
731 | if (!devnode) |
732 | return NULL; | |
733 | ||
27e543fa MCC |
734 | devnode->major = major; |
735 | devnode->minor = minor; | |
736 | ||
1283f849 MCC |
737 | media_interface_init(mdev, &devnode->intf, MEDIA_GRAPH_INTF_DEVNODE, |
738 | type, flags); | |
27e543fa MCC |
739 | |
740 | return devnode; | |
741 | } | |
742 | EXPORT_SYMBOL_GPL(media_devnode_create); | |
743 | ||
744 | void media_devnode_remove(struct media_intf_devnode *devnode) | |
745 | { | |
7c4696a9 | 746 | media_remove_intf_links(&devnode->intf); |
c350ef83 | 747 | media_gobj_destroy(&devnode->intf.graph_obj); |
27e543fa MCC |
748 | kfree(devnode); |
749 | } | |
750 | EXPORT_SYMBOL_GPL(media_devnode_remove); | |
86e26620 MCC |
751 | |
752 | struct media_link *media_create_intf_link(struct media_entity *entity, | |
753 | struct media_interface *intf, | |
754 | u32 flags) | |
755 | { | |
756 | struct media_link *link; | |
757 | ||
758 | link = media_add_link(&intf->links); | |
759 | if (link == NULL) | |
760 | return NULL; | |
761 | ||
762 | link->intf = intf; | |
763 | link->entity = entity; | |
82ae2a50 | 764 | link->flags = flags | MEDIA_LNK_FL_INTERFACE_LINK; |
86e26620 MCC |
765 | |
766 | /* Initialize graph object embedded at the new link */ | |
c350ef83 | 767 | media_gobj_create(intf->graph_obj.mdev, MEDIA_GRAPH_LINK, |
86e26620 MCC |
768 | &link->graph_obj); |
769 | ||
770 | return link; | |
771 | } | |
772 | EXPORT_SYMBOL_GPL(media_create_intf_link); | |
773 | ||
d47109fa | 774 | void __media_remove_intf_link(struct media_link *link) |
86e26620 | 775 | { |
d47109fa | 776 | list_del(&link->list); |
c350ef83 | 777 | media_gobj_destroy(&link->graph_obj); |
86e26620 MCC |
778 | kfree(link); |
779 | } | |
d47109fa | 780 | EXPORT_SYMBOL_GPL(__media_remove_intf_link); |
86e26620 MCC |
781 | |
782 | void media_remove_intf_link(struct media_link *link) | |
783 | { | |
a08fad1e | 784 | spin_lock(&link->graph_obj.mdev->lock); |
86e26620 | 785 | __media_remove_intf_link(link); |
a08fad1e | 786 | spin_unlock(&link->graph_obj.mdev->lock); |
86e26620 MCC |
787 | } |
788 | EXPORT_SYMBOL_GPL(media_remove_intf_link); | |
7c4696a9 MCC |
789 | |
790 | void __media_remove_intf_links(struct media_interface *intf) | |
791 | { | |
792 | struct media_link *link, *tmp; | |
793 | ||
794 | list_for_each_entry_safe(link, tmp, &intf->links, list) | |
795 | __media_remove_intf_link(link); | |
796 | ||
797 | } | |
798 | EXPORT_SYMBOL_GPL(__media_remove_intf_links); | |
799 | ||
800 | void media_remove_intf_links(struct media_interface *intf) | |
801 | { | |
802 | /* Do nothing if the intf is not registered. */ | |
803 | if (intf->graph_obj.mdev == NULL) | |
804 | return; | |
805 | ||
a08fad1e | 806 | spin_lock(&intf->graph_obj.mdev->lock); |
7c4696a9 | 807 | __media_remove_intf_links(intf); |
a08fad1e | 808 | spin_unlock(&intf->graph_obj.mdev->lock); |
7c4696a9 MCC |
809 | } |
810 | EXPORT_SYMBOL_GPL(media_remove_intf_links); |