Commit | Line | Data |
---|---|---|
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 | ||
c8d54cd5 SA |
73 | __must_check int __media_entity_enum_init(struct media_entity_enum *ent_enum, |
74 | int idx_max) | |
75 | { | |
030e89ec SA |
76 | ent_enum->bmap = kcalloc(DIV_ROUND_UP(idx_max, BITS_PER_LONG), |
77 | sizeof(long), GFP_KERNEL); | |
78 | if (!ent_enum->bmap) | |
79 | return -ENOMEM; | |
c8d54cd5 SA |
80 | |
81 | bitmap_zero(ent_enum->bmap, idx_max); | |
82 | ent_enum->idx_max = idx_max; | |
83 | ||
84 | return 0; | |
85 | } | |
86 | EXPORT_SYMBOL_GPL(__media_entity_enum_init); | |
87 | ||
c8d54cd5 SA |
88 | void media_entity_enum_cleanup(struct media_entity_enum *ent_enum) |
89 | { | |
030e89ec | 90 | kfree(ent_enum->bmap); |
c8d54cd5 SA |
91 | } |
92 | EXPORT_SYMBOL_GPL(media_entity_enum_cleanup); | |
93 | ||
1fc25d30 MCC |
94 | /** |
95 | * dev_dbg_obj - Prints in debug mode a change on some object | |
96 | * | |
97 | * @event_name: Name of the event to report. Could be __func__ | |
98 | * @gobj: Pointer to the object | |
99 | * | |
100 | * Enabled only if DEBUG or CONFIG_DYNAMIC_DEBUG. Otherwise, it | |
101 | * won't produce any code. | |
102 | */ | |
39a956c4 MCC |
103 | static void dev_dbg_obj(const char *event_name, struct media_gobj *gobj) |
104 | { | |
105 | #if defined(DEBUG) || defined (CONFIG_DYNAMIC_DEBUG) | |
106 | switch (media_type(gobj)) { | |
107 | case MEDIA_GRAPH_ENTITY: | |
108 | dev_dbg(gobj->mdev->dev, | |
05b3b77c MCC |
109 | "%s id %u: entity '%s'\n", |
110 | event_name, media_id(gobj), | |
39a956c4 MCC |
111 | gobj_to_entity(gobj)->name); |
112 | break; | |
113 | case MEDIA_GRAPH_LINK: | |
114 | { | |
115 | struct media_link *link = gobj_to_link(gobj); | |
116 | ||
117 | dev_dbg(gobj->mdev->dev, | |
05b3b77c MCC |
118 | "%s id %u: %s link id %u ==> id %u\n", |
119 | event_name, media_id(gobj), | |
120 | media_type(link->gobj0) == MEDIA_GRAPH_PAD ? | |
121 | "data" : "interface", | |
122 | media_id(link->gobj0), | |
123 | media_id(link->gobj1)); | |
39a956c4 MCC |
124 | break; |
125 | } | |
126 | case MEDIA_GRAPH_PAD: | |
127 | { | |
128 | struct media_pad *pad = gobj_to_pad(gobj); | |
129 | ||
130 | dev_dbg(gobj->mdev->dev, | |
05b3b77c MCC |
131 | "%s id %u: %s%spad '%s':%d\n", |
132 | event_name, media_id(gobj), | |
133 | pad->flags & MEDIA_PAD_FL_SINK ? "sink " : "", | |
6c24d460 | 134 | pad->flags & MEDIA_PAD_FL_SOURCE ? "source " : "", |
39a956c4 | 135 | pad->entity->name, pad->index); |
27e543fa MCC |
136 | break; |
137 | } | |
138 | case MEDIA_GRAPH_INTF_DEVNODE: | |
139 | { | |
140 | struct media_interface *intf = gobj_to_intf(gobj); | |
141 | struct media_intf_devnode *devnode = intf_to_devnode(intf); | |
142 | ||
143 | dev_dbg(gobj->mdev->dev, | |
05b3b77c MCC |
144 | "%s id %u: intf_devnode %s - major: %d, minor: %d\n", |
145 | event_name, media_id(gobj), | |
27e543fa MCC |
146 | intf_type(intf), |
147 | devnode->major, devnode->minor); | |
148 | break; | |
39a956c4 MCC |
149 | } |
150 | } | |
151 | #endif | |
152 | } | |
153 | ||
c350ef83 | 154 | void media_gobj_create(struct media_device *mdev, |
ec6e4c95 MCC |
155 | enum media_gobj_type type, |
156 | struct media_gobj *gobj) | |
157 | { | |
8f6d368f MCC |
158 | BUG_ON(!mdev); |
159 | ||
39a956c4 MCC |
160 | gobj->mdev = mdev; |
161 | ||
bfab2aac | 162 | /* Create a per-type unique object ID */ |
05b3b77c MCC |
163 | gobj->id = media_gobj_gen_id(type, ++mdev->id); |
164 | ||
bfab2aac MCC |
165 | switch (type) { |
166 | case MEDIA_GRAPH_ENTITY: | |
05bfa9fa | 167 | list_add_tail(&gobj->list, &mdev->entities); |
bfab2aac | 168 | break; |
18710dc6 | 169 | case MEDIA_GRAPH_PAD: |
9155d859 | 170 | list_add_tail(&gobj->list, &mdev->pads); |
18710dc6 | 171 | break; |
6b6a4278 | 172 | case MEDIA_GRAPH_LINK: |
9155d859 | 173 | list_add_tail(&gobj->list, &mdev->links); |
6b6a4278 | 174 | break; |
27e543fa | 175 | case MEDIA_GRAPH_INTF_DEVNODE: |
9155d859 | 176 | list_add_tail(&gobj->list, &mdev->interfaces); |
27e543fa | 177 | break; |
bfab2aac | 178 | } |
2521fdac MCC |
179 | |
180 | mdev->topology_version++; | |
181 | ||
39a956c4 | 182 | dev_dbg_obj(__func__, gobj); |
ec6e4c95 MCC |
183 | } |
184 | ||
c350ef83 | 185 | void media_gobj_destroy(struct media_gobj *gobj) |
ec6e4c95 | 186 | { |
39a956c4 | 187 | dev_dbg_obj(__func__, gobj); |
9155d859 | 188 | |
2521fdac MCC |
189 | gobj->mdev->topology_version++; |
190 | ||
9155d859 MCC |
191 | /* Remove the object from mdev list */ |
192 | list_del(&gobj->list); | |
ec6e4c95 MCC |
193 | } |
194 | ||
1fc25d30 MCC |
195 | int media_entity_pads_init(struct media_entity *entity, u16 num_pads, |
196 | struct media_pad *pads) | |
53e269c1 | 197 | { |
db141a35 | 198 | struct media_device *mdev = entity->graph_obj.mdev; |
53e269c1 LP |
199 | unsigned int i; |
200 | ||
53e269c1 LP |
201 | entity->num_pads = num_pads; |
202 | entity->pads = pads; | |
53e269c1 | 203 | |
db141a35 JMC |
204 | if (mdev) |
205 | spin_lock(&mdev->lock); | |
206 | ||
53e269c1 LP |
207 | for (i = 0; i < num_pads; i++) { |
208 | pads[i].entity = entity; | |
209 | pads[i].index = i; | |
db141a35 | 210 | if (mdev) |
c350ef83 | 211 | media_gobj_create(mdev, MEDIA_GRAPH_PAD, |
db141a35 | 212 | &entity->pads[i].graph_obj); |
53e269c1 LP |
213 | } |
214 | ||
db141a35 JMC |
215 | if (mdev) |
216 | spin_unlock(&mdev->lock); | |
217 | ||
53e269c1 LP |
218 | return 0; |
219 | } | |
ab22e77c | 220 | EXPORT_SYMBOL_GPL(media_entity_pads_init); |
53e269c1 | 221 | |
a5ccc48a SA |
222 | /* ----------------------------------------------------------------------------- |
223 | * Graph traversal | |
224 | */ | |
225 | ||
226 | static struct media_entity * | |
227 | media_entity_other(struct media_entity *entity, struct media_link *link) | |
228 | { | |
229 | if (link->source->entity == entity) | |
230 | return link->sink->entity; | |
231 | else | |
232 | return link->source->entity; | |
233 | } | |
234 | ||
235 | /* push an entity to traversal stack */ | |
236 | static void stack_push(struct media_entity_graph *graph, | |
237 | struct media_entity *entity) | |
238 | { | |
239 | if (graph->top == MEDIA_ENTITY_ENUM_MAX_DEPTH - 1) { | |
240 | WARN_ON(1); | |
241 | return; | |
242 | } | |
243 | graph->top++; | |
313895fb | 244 | graph->stack[graph->top].link = entity->links.next; |
a5ccc48a SA |
245 | graph->stack[graph->top].entity = entity; |
246 | } | |
247 | ||
248 | static struct media_entity *stack_pop(struct media_entity_graph *graph) | |
249 | { | |
250 | struct media_entity *entity; | |
251 | ||
252 | entity = graph->stack[graph->top].entity; | |
253 | graph->top--; | |
254 | ||
255 | return entity; | |
256 | } | |
257 | ||
a5ccc48a SA |
258 | #define link_top(en) ((en)->stack[(en)->top].link) |
259 | #define stack_top(en) ((en)->stack[(en)->top].entity) | |
260 | ||
0798ce4a SA |
261 | /* |
262 | * TODO: Get rid of this. | |
263 | */ | |
430a672c | 264 | #define MEDIA_ENTITY_MAX_PADS 512 |
0798ce4a | 265 | |
e03d2203 SA |
266 | /** |
267 | * media_entity_graph_walk_init - Allocate resources for graph walk | |
268 | * @graph: Media graph structure that will be used to walk the graph | |
269 | * @mdev: Media device | |
270 | * | |
271 | * Reserve resources for graph walk in media device's current | |
272 | * state. The memory must be released using | |
273 | * media_entity_graph_walk_free(). | |
274 | * | |
275 | * Returns error on failure, zero on success. | |
276 | */ | |
277 | __must_check int media_entity_graph_walk_init( | |
278 | struct media_entity_graph *graph, struct media_device *mdev) | |
279 | { | |
29d8da02 | 280 | return media_entity_enum_init(&graph->ent_enum, mdev); |
e03d2203 SA |
281 | } |
282 | EXPORT_SYMBOL_GPL(media_entity_graph_walk_init); | |
283 | ||
284 | /** | |
285 | * media_entity_graph_walk_cleanup - Release resources related to graph walking | |
286 | * @graph: Media graph structure that was used to walk the graph | |
287 | */ | |
288 | void media_entity_graph_walk_cleanup(struct media_entity_graph *graph) | |
289 | { | |
29d8da02 | 290 | media_entity_enum_cleanup(&graph->ent_enum); |
e03d2203 SA |
291 | } |
292 | EXPORT_SYMBOL_GPL(media_entity_graph_walk_cleanup); | |
293 | ||
a5ccc48a SA |
294 | void media_entity_graph_walk_start(struct media_entity_graph *graph, |
295 | struct media_entity *entity) | |
296 | { | |
29d8da02 SA |
297 | media_entity_enum_zero(&graph->ent_enum); |
298 | media_entity_enum_set(&graph->ent_enum, entity); | |
299 | ||
a5ccc48a SA |
300 | graph->top = 0; |
301 | graph->stack[graph->top].entity = NULL; | |
302 | stack_push(graph, entity); | |
303 | } | |
304 | EXPORT_SYMBOL_GPL(media_entity_graph_walk_start); | |
305 | ||
a5ccc48a SA |
306 | struct media_entity * |
307 | media_entity_graph_walk_next(struct media_entity_graph *graph) | |
308 | { | |
309 | if (stack_top(graph) == NULL) | |
310 | return NULL; | |
311 | ||
312 | /* | |
313 | * Depth first search. Push entity to stack and continue from | |
314 | * top of the stack until no more entities on the level can be | |
315 | * found. | |
316 | */ | |
313895fb | 317 | while (link_top(graph) != &stack_top(graph)->links) { |
a5ccc48a | 318 | struct media_entity *entity = stack_top(graph); |
57208e5e | 319 | struct media_link *link; |
a5ccc48a SA |
320 | struct media_entity *next; |
321 | ||
57208e5e MCC |
322 | link = list_entry(link_top(graph), typeof(*link), list); |
323 | ||
a5ccc48a SA |
324 | /* The link is not enabled so we do not follow. */ |
325 | if (!(link->flags & MEDIA_LNK_FL_ENABLED)) { | |
57208e5e | 326 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
327 | continue; |
328 | } | |
329 | ||
330 | /* Get the entity in the other end of the link . */ | |
331 | next = media_entity_other(entity, link); | |
332 | ||
5c7b25b9 | 333 | /* Has the entity already been visited? */ |
29d8da02 | 334 | if (media_entity_enum_test_and_set(&graph->ent_enum, next)) { |
57208e5e | 335 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
336 | continue; |
337 | } | |
338 | ||
339 | /* Push the new entity to stack and start over. */ | |
57208e5e | 340 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
341 | stack_push(graph, next); |
342 | } | |
343 | ||
344 | return stack_pop(graph); | |
345 | } | |
346 | EXPORT_SYMBOL_GPL(media_entity_graph_walk_next); | |
347 | ||
e02188c9 LP |
348 | /* ----------------------------------------------------------------------------- |
349 | * Pipeline management | |
350 | */ | |
351 | ||
af88be38 SA |
352 | __must_check int media_entity_pipeline_start(struct media_entity *entity, |
353 | struct media_pipeline *pipe) | |
e02188c9 | 354 | { |
d10c9894 | 355 | struct media_device *mdev = entity->graph_obj.mdev; |
5dd8775d | 356 | struct media_entity_graph *graph = &pipe->graph; |
af88be38 | 357 | struct media_entity *entity_err = entity; |
57208e5e | 358 | struct media_link *link; |
af88be38 | 359 | int ret; |
e02188c9 LP |
360 | |
361 | mutex_lock(&mdev->graph_mutex); | |
362 | ||
74a41330 SA |
363 | if (!pipe->streaming_count++) { |
364 | ret = media_entity_graph_walk_init(&pipe->graph, mdev); | |
365 | if (ret) | |
366 | goto error_graph_walk_start; | |
106b9907 SA |
367 | } |
368 | ||
369 | media_entity_graph_walk_start(&pipe->graph, entity); | |
e02188c9 | 370 | |
5dd8775d | 371 | while ((entity = media_entity_graph_walk_next(graph))) { |
ef69ee1b MCC |
372 | DECLARE_BITMAP(active, MEDIA_ENTITY_MAX_PADS); |
373 | DECLARE_BITMAP(has_no_links, MEDIA_ENTITY_MAX_PADS); | |
af88be38 | 374 | |
e02188c9 | 375 | entity->stream_count++; |
8aaf62b5 SA |
376 | |
377 | if (WARN_ON(entity->pipe && entity->pipe != pipe)) { | |
378 | ret = -EBUSY; | |
379 | goto error; | |
380 | } | |
381 | ||
e02188c9 | 382 | entity->pipe = pipe; |
af88be38 SA |
383 | |
384 | /* Already streaming --- no need to check. */ | |
385 | if (entity->stream_count > 1) | |
386 | continue; | |
387 | ||
388 | if (!entity->ops || !entity->ops->link_validate) | |
389 | continue; | |
390 | ||
de49c285 SA |
391 | bitmap_zero(active, entity->num_pads); |
392 | bitmap_fill(has_no_links, entity->num_pads); | |
393 | ||
57208e5e | 394 | list_for_each_entry(link, &entity->links, list) { |
de49c285 SA |
395 | struct media_pad *pad = link->sink->entity == entity |
396 | ? link->sink : link->source; | |
397 | ||
398 | /* Mark that a pad is connected by a link. */ | |
399 | bitmap_clear(has_no_links, pad->index, 1); | |
400 | ||
401 | /* | |
402 | * Pads that either do not need to connect or | |
403 | * are connected through an enabled link are | |
404 | * fine. | |
405 | */ | |
406 | if (!(pad->flags & MEDIA_PAD_FL_MUST_CONNECT) || | |
407 | link->flags & MEDIA_LNK_FL_ENABLED) | |
408 | bitmap_set(active, pad->index, 1); | |
409 | ||
410 | /* | |
411 | * Link validation will only take place for | |
412 | * sink ends of the link that are enabled. | |
413 | */ | |
414 | if (link->sink != pad || | |
415 | !(link->flags & MEDIA_LNK_FL_ENABLED)) | |
af88be38 SA |
416 | continue; |
417 | ||
418 | ret = entity->ops->link_validate(link); | |
fab9d30b | 419 | if (ret < 0 && ret != -ENOIOCTLCMD) { |
d10c9894 | 420 | dev_dbg(entity->graph_obj.mdev->dev, |
fab9d30b | 421 | "link validation failed for \"%s\":%u -> \"%s\":%u, error %d\n", |
823ea2a6 SA |
422 | link->source->entity->name, |
423 | link->source->index, | |
424 | entity->name, link->sink->index, ret); | |
af88be38 | 425 | goto error; |
fab9d30b | 426 | } |
af88be38 | 427 | } |
de49c285 SA |
428 | |
429 | /* Either no links or validated links are fine. */ | |
430 | bitmap_or(active, active, has_no_links, entity->num_pads); | |
431 | ||
432 | if (!bitmap_full(active, entity->num_pads)) { | |
433 | ret = -EPIPE; | |
d10c9894 | 434 | dev_dbg(entity->graph_obj.mdev->dev, |
fab9d30b SA |
435 | "\"%s\":%u must be connected by an enabled link\n", |
436 | entity->name, | |
094f1ca5 SA |
437 | (unsigned)find_first_zero_bit( |
438 | active, entity->num_pads)); | |
de49c285 SA |
439 | goto error; |
440 | } | |
e02188c9 LP |
441 | } |
442 | ||
443 | mutex_unlock(&mdev->graph_mutex); | |
af88be38 SA |
444 | |
445 | return 0; | |
446 | ||
447 | error: | |
448 | /* | |
449 | * Link validation on graph failed. We revert what we did and | |
450 | * return the error. | |
451 | */ | |
5dd8775d | 452 | media_entity_graph_walk_start(graph, entity_err); |
af88be38 | 453 | |
5dd8775d | 454 | while ((entity_err = media_entity_graph_walk_next(graph))) { |
af88be38 SA |
455 | entity_err->stream_count--; |
456 | if (entity_err->stream_count == 0) | |
457 | entity_err->pipe = NULL; | |
458 | ||
459 | /* | |
460 | * We haven't increased stream_count further than this | |
461 | * so we quit here. | |
462 | */ | |
463 | if (entity_err == entity) | |
464 | break; | |
465 | } | |
466 | ||
74a41330 SA |
467 | error_graph_walk_start: |
468 | if (!--pipe->streaming_count) | |
469 | media_entity_graph_walk_cleanup(graph); | |
106b9907 | 470 | |
af88be38 SA |
471 | mutex_unlock(&mdev->graph_mutex); |
472 | ||
473 | return ret; | |
e02188c9 LP |
474 | } |
475 | EXPORT_SYMBOL_GPL(media_entity_pipeline_start); | |
476 | ||
e02188c9 LP |
477 | void media_entity_pipeline_stop(struct media_entity *entity) |
478 | { | |
d10c9894 | 479 | struct media_device *mdev = entity->graph_obj.mdev; |
5dd8775d | 480 | struct media_entity_graph *graph = &entity->pipe->graph; |
74a41330 | 481 | struct media_pipeline *pipe = entity->pipe; |
e02188c9 LP |
482 | |
483 | mutex_lock(&mdev->graph_mutex); | |
484 | ||
74a41330 | 485 | WARN_ON(!pipe->streaming_count); |
5dd8775d | 486 | media_entity_graph_walk_start(graph, entity); |
e02188c9 | 487 | |
5dd8775d | 488 | while ((entity = media_entity_graph_walk_next(graph))) { |
e02188c9 LP |
489 | entity->stream_count--; |
490 | if (entity->stream_count == 0) | |
491 | entity->pipe = NULL; | |
492 | } | |
493 | ||
74a41330 SA |
494 | if (!--pipe->streaming_count) |
495 | media_entity_graph_walk_cleanup(graph); | |
106b9907 | 496 | |
e02188c9 LP |
497 | mutex_unlock(&mdev->graph_mutex); |
498 | } | |
499 | EXPORT_SYMBOL_GPL(media_entity_pipeline_stop); | |
500 | ||
503c3d82 LP |
501 | /* ----------------------------------------------------------------------------- |
502 | * Module use count | |
503 | */ | |
504 | ||
503c3d82 LP |
505 | struct media_entity *media_entity_get(struct media_entity *entity) |
506 | { | |
507 | if (entity == NULL) | |
508 | return NULL; | |
509 | ||
d10c9894 JMC |
510 | if (entity->graph_obj.mdev->dev && |
511 | !try_module_get(entity->graph_obj.mdev->dev->driver->owner)) | |
503c3d82 LP |
512 | return NULL; |
513 | ||
514 | return entity; | |
515 | } | |
516 | EXPORT_SYMBOL_GPL(media_entity_get); | |
517 | ||
503c3d82 LP |
518 | void media_entity_put(struct media_entity *entity) |
519 | { | |
520 | if (entity == NULL) | |
521 | return; | |
522 | ||
d10c9894 JMC |
523 | if (entity->graph_obj.mdev->dev) |
524 | module_put(entity->graph_obj.mdev->dev->driver->owner); | |
503c3d82 LP |
525 | } |
526 | EXPORT_SYMBOL_GPL(media_entity_put); | |
527 | ||
a5ccc48a SA |
528 | /* ----------------------------------------------------------------------------- |
529 | * Links management | |
530 | */ | |
531 | ||
23615de5 | 532 | static struct media_link *media_add_link(struct list_head *head) |
53e269c1 | 533 | { |
57208e5e | 534 | struct media_link *link; |
53e269c1 | 535 | |
57208e5e MCC |
536 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
537 | if (link == NULL) | |
538 | return NULL; | |
53e269c1 | 539 | |
23615de5 | 540 | list_add_tail(&link->list, head); |
53e269c1 | 541 | |
57208e5e | 542 | return link; |
53e269c1 LP |
543 | } |
544 | ||
57208e5e | 545 | static void __media_entity_remove_link(struct media_entity *entity, |
5abad22f MCC |
546 | struct media_link *link) |
547 | { | |
548 | struct media_link *rlink, *tmp; | |
549 | struct media_entity *remote; | |
5abad22f MCC |
550 | |
551 | if (link->source->entity == entity) | |
552 | remote = link->sink->entity; | |
553 | else | |
554 | remote = link->source->entity; | |
555 | ||
556 | list_for_each_entry_safe(rlink, tmp, &remote->links, list) { | |
58f69ee9 | 557 | if (rlink != link->reverse) |
5abad22f | 558 | continue; |
5abad22f MCC |
559 | |
560 | if (link->source->entity == entity) | |
561 | remote->num_backlinks--; | |
562 | ||
563 | /* Remove the remote link */ | |
564 | list_del(&rlink->list); | |
c350ef83 | 565 | media_gobj_destroy(&rlink->graph_obj); |
5abad22f MCC |
566 | kfree(rlink); |
567 | ||
568 | if (--remote->num_links == 0) | |
569 | break; | |
570 | } | |
571 | list_del(&link->list); | |
c350ef83 | 572 | media_gobj_destroy(&link->graph_obj); |
5abad22f MCC |
573 | kfree(link); |
574 | } | |
57208e5e | 575 | |
53e269c1 | 576 | int |
8df00a15 | 577 | media_create_pad_link(struct media_entity *source, u16 source_pad, |
53e269c1 LP |
578 | struct media_entity *sink, u16 sink_pad, u32 flags) |
579 | { | |
580 | struct media_link *link; | |
581 | struct media_link *backlink; | |
582 | ||
583 | BUG_ON(source == NULL || sink == NULL); | |
584 | BUG_ON(source_pad >= source->num_pads); | |
585 | BUG_ON(sink_pad >= sink->num_pads); | |
586 | ||
23615de5 | 587 | link = media_add_link(&source->links); |
53e269c1 LP |
588 | if (link == NULL) |
589 | return -ENOMEM; | |
590 | ||
591 | link->source = &source->pads[source_pad]; | |
592 | link->sink = &sink->pads[sink_pad]; | |
82ae2a50 | 593 | link->flags = flags & ~MEDIA_LNK_FL_INTERFACE_LINK; |
53e269c1 | 594 | |
6b6a4278 | 595 | /* Initialize graph object embedded at the new link */ |
c350ef83 | 596 | media_gobj_create(source->graph_obj.mdev, MEDIA_GRAPH_LINK, |
d10c9894 | 597 | &link->graph_obj); |
6b6a4278 | 598 | |
53e269c1 LP |
599 | /* Create the backlink. Backlinks are used to help graph traversal and |
600 | * are not reported to userspace. | |
601 | */ | |
23615de5 | 602 | backlink = media_add_link(&sink->links); |
53e269c1 | 603 | if (backlink == NULL) { |
57208e5e | 604 | __media_entity_remove_link(source, link); |
53e269c1 LP |
605 | return -ENOMEM; |
606 | } | |
607 | ||
608 | backlink->source = &source->pads[source_pad]; | |
609 | backlink->sink = &sink->pads[sink_pad]; | |
610 | backlink->flags = flags; | |
39d1ebc6 | 611 | backlink->is_backlink = true; |
53e269c1 | 612 | |
6b6a4278 | 613 | /* Initialize graph object embedded at the new link */ |
c350ef83 | 614 | media_gobj_create(sink->graph_obj.mdev, MEDIA_GRAPH_LINK, |
d10c9894 | 615 | &backlink->graph_obj); |
6b6a4278 | 616 | |
53e269c1 LP |
617 | link->reverse = backlink; |
618 | backlink->reverse = link; | |
619 | ||
620 | sink->num_backlinks++; | |
57208e5e MCC |
621 | sink->num_links++; |
622 | source->num_links++; | |
53e269c1 LP |
623 | |
624 | return 0; | |
625 | } | |
8df00a15 | 626 | EXPORT_SYMBOL_GPL(media_create_pad_link); |
97548ed4 | 627 | |
b01cc9ce MCC |
628 | int media_create_pad_links(const struct media_device *mdev, |
629 | const u32 source_function, | |
630 | struct media_entity *source, | |
631 | const u16 source_pad, | |
632 | const u32 sink_function, | |
633 | struct media_entity *sink, | |
634 | const u16 sink_pad, | |
635 | u32 flags, | |
636 | const bool allow_both_undefined) | |
637 | { | |
638 | struct media_entity *entity; | |
639 | unsigned function; | |
640 | int ret; | |
641 | ||
642 | /* Trivial case: 1:1 relation */ | |
643 | if (source && sink) | |
644 | return media_create_pad_link(source, source_pad, | |
645 | sink, sink_pad, flags); | |
646 | ||
647 | /* Worse case scenario: n:n relation */ | |
648 | if (!source && !sink) { | |
649 | if (!allow_both_undefined) | |
650 | return 0; | |
651 | media_device_for_each_entity(source, mdev) { | |
652 | if (source->function != source_function) | |
653 | continue; | |
654 | media_device_for_each_entity(sink, mdev) { | |
655 | if (sink->function != sink_function) | |
656 | continue; | |
657 | ret = media_create_pad_link(source, source_pad, | |
658 | sink, sink_pad, | |
659 | flags); | |
660 | if (ret) | |
661 | return ret; | |
662 | flags &= ~(MEDIA_LNK_FL_ENABLED | | |
663 | MEDIA_LNK_FL_IMMUTABLE); | |
664 | } | |
665 | } | |
666 | return 0; | |
667 | } | |
668 | ||
669 | /* Handle 1:n and n:1 cases */ | |
670 | if (source) | |
671 | function = sink_function; | |
672 | else | |
673 | function = source_function; | |
674 | ||
675 | media_device_for_each_entity(entity, mdev) { | |
676 | if (entity->function != function) | |
677 | continue; | |
678 | ||
679 | if (source) | |
680 | ret = media_create_pad_link(source, source_pad, | |
681 | entity, sink_pad, flags); | |
682 | else | |
683 | ret = media_create_pad_link(entity, source_pad, | |
684 | sink, sink_pad, flags); | |
685 | if (ret) | |
686 | return ret; | |
687 | flags &= ~(MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE); | |
688 | } | |
689 | return 0; | |
690 | } | |
691 | EXPORT_SYMBOL_GPL(media_create_pad_links); | |
692 | ||
57208e5e MCC |
693 | void __media_entity_remove_links(struct media_entity *entity) |
694 | { | |
695 | struct media_link *link, *tmp; | |
7349cec1 | 696 | |
57208e5e MCC |
697 | list_for_each_entry_safe(link, tmp, &entity->links, list) |
698 | __media_entity_remove_link(entity, link); | |
7349cec1 SN |
699 | |
700 | entity->num_links = 0; | |
701 | entity->num_backlinks = 0; | |
702 | } | |
703 | EXPORT_SYMBOL_GPL(__media_entity_remove_links); | |
704 | ||
705 | void media_entity_remove_links(struct media_entity *entity) | |
706 | { | |
cc4a8258 MCC |
707 | struct media_device *mdev = entity->graph_obj.mdev; |
708 | ||
7349cec1 | 709 | /* Do nothing if the entity is not registered. */ |
cc4a8258 | 710 | if (mdev == NULL) |
7349cec1 SN |
711 | return; |
712 | ||
cc4a8258 | 713 | spin_lock(&mdev->lock); |
7349cec1 | 714 | __media_entity_remove_links(entity); |
cc4a8258 | 715 | spin_unlock(&mdev->lock); |
7349cec1 SN |
716 | } |
717 | EXPORT_SYMBOL_GPL(media_entity_remove_links); | |
718 | ||
97548ed4 LP |
719 | static int __media_entity_setup_link_notify(struct media_link *link, u32 flags) |
720 | { | |
97548ed4 LP |
721 | int ret; |
722 | ||
723 | /* Notify both entities. */ | |
724 | ret = media_entity_call(link->source->entity, link_setup, | |
725 | link->source, link->sink, flags); | |
726 | if (ret < 0 && ret != -ENOIOCTLCMD) | |
727 | return ret; | |
728 | ||
729 | ret = media_entity_call(link->sink->entity, link_setup, | |
730 | link->sink, link->source, flags); | |
731 | if (ret < 0 && ret != -ENOIOCTLCMD) { | |
732 | media_entity_call(link->source->entity, link_setup, | |
733 | link->source, link->sink, link->flags); | |
734 | return ret; | |
735 | } | |
736 | ||
7a6f0b22 | 737 | link->flags = flags; |
97548ed4 LP |
738 | link->reverse->flags = link->flags; |
739 | ||
740 | return 0; | |
741 | } | |
742 | ||
97548ed4 LP |
743 | int __media_entity_setup_link(struct media_link *link, u32 flags) |
744 | { | |
7a6f0b22 | 745 | const u32 mask = MEDIA_LNK_FL_ENABLED; |
97548ed4 LP |
746 | struct media_device *mdev; |
747 | struct media_entity *source, *sink; | |
748 | int ret = -EBUSY; | |
749 | ||
750 | if (link == NULL) | |
751 | return -EINVAL; | |
752 | ||
7a6f0b22 LP |
753 | /* The non-modifiable link flags must not be modified. */ |
754 | if ((link->flags & ~mask) != (flags & ~mask)) | |
755 | return -EINVAL; | |
756 | ||
97548ed4 LP |
757 | if (link->flags & MEDIA_LNK_FL_IMMUTABLE) |
758 | return link->flags == flags ? 0 : -EINVAL; | |
759 | ||
760 | if (link->flags == flags) | |
761 | return 0; | |
762 | ||
763 | source = link->source->entity; | |
764 | sink = link->sink->entity; | |
765 | ||
e02188c9 LP |
766 | if (!(link->flags & MEDIA_LNK_FL_DYNAMIC) && |
767 | (source->stream_count || sink->stream_count)) | |
768 | return -EBUSY; | |
769 | ||
d10c9894 | 770 | mdev = source->graph_obj.mdev; |
97548ed4 | 771 | |
813f5c0a SN |
772 | if (mdev->link_notify) { |
773 | ret = mdev->link_notify(link, flags, | |
774 | MEDIA_DEV_NOTIFY_PRE_LINK_CH); | |
97548ed4 LP |
775 | if (ret < 0) |
776 | return ret; | |
777 | } | |
778 | ||
779 | ret = __media_entity_setup_link_notify(link, flags); | |
97548ed4 | 780 | |
813f5c0a SN |
781 | if (mdev->link_notify) |
782 | mdev->link_notify(link, flags, MEDIA_DEV_NOTIFY_POST_LINK_CH); | |
97548ed4 LP |
783 | |
784 | return ret; | |
785 | } | |
786 | ||
787 | int media_entity_setup_link(struct media_link *link, u32 flags) | |
788 | { | |
789 | int ret; | |
790 | ||
5c883edb | 791 | mutex_lock(&link->graph_obj.mdev->graph_mutex); |
97548ed4 | 792 | ret = __media_entity_setup_link(link, flags); |
5c883edb | 793 | mutex_unlock(&link->graph_obj.mdev->graph_mutex); |
97548ed4 LP |
794 | |
795 | return ret; | |
796 | } | |
797 | EXPORT_SYMBOL_GPL(media_entity_setup_link); | |
798 | ||
97548ed4 LP |
799 | struct media_link * |
800 | media_entity_find_link(struct media_pad *source, struct media_pad *sink) | |
801 | { | |
802 | struct media_link *link; | |
97548ed4 | 803 | |
57208e5e | 804 | list_for_each_entry(link, &source->entity->links, list) { |
97548ed4 LP |
805 | if (link->source->entity == source->entity && |
806 | link->source->index == source->index && | |
807 | link->sink->entity == sink->entity && | |
808 | link->sink->index == sink->index) | |
809 | return link; | |
810 | } | |
811 | ||
812 | return NULL; | |
813 | } | |
814 | EXPORT_SYMBOL_GPL(media_entity_find_link); | |
815 | ||
1bddf1b3 | 816 | struct media_pad *media_entity_remote_pad(struct media_pad *pad) |
97548ed4 | 817 | { |
57208e5e | 818 | struct media_link *link; |
97548ed4 | 819 | |
57208e5e | 820 | list_for_each_entry(link, &pad->entity->links, list) { |
97548ed4 LP |
821 | if (!(link->flags & MEDIA_LNK_FL_ENABLED)) |
822 | continue; | |
823 | ||
824 | if (link->source == pad) | |
825 | return link->sink; | |
826 | ||
827 | if (link->sink == pad) | |
828 | return link->source; | |
829 | } | |
830 | ||
831 | return NULL; | |
832 | ||
833 | } | |
1bddf1b3 | 834 | EXPORT_SYMBOL_GPL(media_entity_remote_pad); |
27e543fa | 835 | |
1283f849 MCC |
836 | static void media_interface_init(struct media_device *mdev, |
837 | struct media_interface *intf, | |
838 | u32 gobj_type, | |
839 | u32 intf_type, u32 flags) | |
840 | { | |
841 | intf->type = intf_type; | |
842 | intf->flags = flags; | |
843 | INIT_LIST_HEAD(&intf->links); | |
844 | ||
c350ef83 | 845 | media_gobj_create(mdev, gobj_type, &intf->graph_obj); |
1283f849 MCC |
846 | } |
847 | ||
27e543fa MCC |
848 | /* Functions related to the media interface via device nodes */ |
849 | ||
850 | struct media_intf_devnode *media_devnode_create(struct media_device *mdev, | |
851 | u32 type, u32 flags, | |
0b3b72df | 852 | u32 major, u32 minor) |
27e543fa MCC |
853 | { |
854 | struct media_intf_devnode *devnode; | |
27e543fa | 855 | |
0b3b72df | 856 | devnode = kzalloc(sizeof(*devnode), GFP_KERNEL); |
27e543fa MCC |
857 | if (!devnode) |
858 | return NULL; | |
859 | ||
27e543fa MCC |
860 | devnode->major = major; |
861 | devnode->minor = minor; | |
862 | ||
1283f849 MCC |
863 | media_interface_init(mdev, &devnode->intf, MEDIA_GRAPH_INTF_DEVNODE, |
864 | type, flags); | |
27e543fa MCC |
865 | |
866 | return devnode; | |
867 | } | |
868 | EXPORT_SYMBOL_GPL(media_devnode_create); | |
869 | ||
870 | void media_devnode_remove(struct media_intf_devnode *devnode) | |
871 | { | |
7c4696a9 | 872 | media_remove_intf_links(&devnode->intf); |
c350ef83 | 873 | media_gobj_destroy(&devnode->intf.graph_obj); |
27e543fa MCC |
874 | kfree(devnode); |
875 | } | |
876 | EXPORT_SYMBOL_GPL(media_devnode_remove); | |
86e26620 MCC |
877 | |
878 | struct media_link *media_create_intf_link(struct media_entity *entity, | |
879 | struct media_interface *intf, | |
880 | u32 flags) | |
881 | { | |
882 | struct media_link *link; | |
883 | ||
884 | link = media_add_link(&intf->links); | |
885 | if (link == NULL) | |
886 | return NULL; | |
887 | ||
888 | link->intf = intf; | |
889 | link->entity = entity; | |
82ae2a50 | 890 | link->flags = flags | MEDIA_LNK_FL_INTERFACE_LINK; |
86e26620 MCC |
891 | |
892 | /* Initialize graph object embedded at the new link */ | |
c350ef83 | 893 | media_gobj_create(intf->graph_obj.mdev, MEDIA_GRAPH_LINK, |
86e26620 MCC |
894 | &link->graph_obj); |
895 | ||
896 | return link; | |
897 | } | |
898 | EXPORT_SYMBOL_GPL(media_create_intf_link); | |
899 | ||
d47109fa | 900 | void __media_remove_intf_link(struct media_link *link) |
86e26620 | 901 | { |
d47109fa | 902 | list_del(&link->list); |
c350ef83 | 903 | media_gobj_destroy(&link->graph_obj); |
86e26620 MCC |
904 | kfree(link); |
905 | } | |
d47109fa | 906 | EXPORT_SYMBOL_GPL(__media_remove_intf_link); |
86e26620 MCC |
907 | |
908 | void media_remove_intf_link(struct media_link *link) | |
909 | { | |
cc4a8258 MCC |
910 | struct media_device *mdev = link->graph_obj.mdev; |
911 | ||
912 | /* Do nothing if the intf is not registered. */ | |
913 | if (mdev == NULL) | |
914 | return; | |
915 | ||
916 | spin_lock(&mdev->lock); | |
86e26620 | 917 | __media_remove_intf_link(link); |
cc4a8258 | 918 | spin_unlock(&mdev->lock); |
86e26620 MCC |
919 | } |
920 | EXPORT_SYMBOL_GPL(media_remove_intf_link); | |
7c4696a9 MCC |
921 | |
922 | void __media_remove_intf_links(struct media_interface *intf) | |
923 | { | |
924 | struct media_link *link, *tmp; | |
925 | ||
926 | list_for_each_entry_safe(link, tmp, &intf->links, list) | |
927 | __media_remove_intf_link(link); | |
928 | ||
929 | } | |
930 | EXPORT_SYMBOL_GPL(__media_remove_intf_links); | |
931 | ||
932 | void media_remove_intf_links(struct media_interface *intf) | |
933 | { | |
cc4a8258 MCC |
934 | struct media_device *mdev = intf->graph_obj.mdev; |
935 | ||
7c4696a9 | 936 | /* Do nothing if the intf is not registered. */ |
cc4a8258 | 937 | if (mdev == NULL) |
7c4696a9 MCC |
938 | return; |
939 | ||
cc4a8258 | 940 | spin_lock(&mdev->lock); |
7c4696a9 | 941 | __media_remove_intf_links(intf); |
cc4a8258 | 942 | spin_unlock(&mdev->lock); |
7c4696a9 MCC |
943 | } |
944 | EXPORT_SYMBOL_GPL(media_remove_intf_links); |