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 | /** |
30 | * dev_dbg_obj - Prints in debug mode a change on some object | |
31 | * | |
32 | * @event_name: Name of the event to report. Could be __func__ | |
33 | * @gobj: Pointer to the object | |
34 | * | |
35 | * Enabled only if DEBUG or CONFIG_DYNAMIC_DEBUG. Otherwise, it | |
36 | * won't produce any code. | |
37 | */ | |
38 | static inline const char *gobj_type(enum media_gobj_type type) | |
39 | { | |
40 | switch (type) { | |
41 | case MEDIA_GRAPH_ENTITY: | |
42 | return "entity"; | |
43 | case MEDIA_GRAPH_PAD: | |
44 | return "pad"; | |
45 | case MEDIA_GRAPH_LINK: | |
46 | return "link"; | |
27e543fa MCC |
47 | case MEDIA_GRAPH_INTF_DEVNODE: |
48 | return "intf-devnode"; | |
39a956c4 MCC |
49 | default: |
50 | return "unknown"; | |
51 | } | |
52 | } | |
53 | ||
27e543fa MCC |
54 | static inline const char *intf_type(struct media_interface *intf) |
55 | { | |
56 | switch (intf->type) { | |
57 | case MEDIA_INTF_T_DVB_FE: | |
58 | return "frontend"; | |
59 | case MEDIA_INTF_T_DVB_DEMUX: | |
60 | return "demux"; | |
61 | case MEDIA_INTF_T_DVB_DVR: | |
62 | return "DVR"; | |
63 | case MEDIA_INTF_T_DVB_CA: | |
64 | return "CA"; | |
65 | case MEDIA_INTF_T_DVB_NET: | |
66 | return "dvbnet"; | |
67 | case MEDIA_INTF_T_V4L_VIDEO: | |
68 | return "video"; | |
69 | case MEDIA_INTF_T_V4L_VBI: | |
70 | return "vbi"; | |
71 | case MEDIA_INTF_T_V4L_RADIO: | |
72 | return "radio"; | |
73 | case MEDIA_INTF_T_V4L_SUBDEV: | |
74 | return "v4l2-subdev"; | |
75 | case MEDIA_INTF_T_V4L_SWRADIO: | |
76 | return "swradio"; | |
77 | default: | |
78 | return "unknown-intf"; | |
79 | } | |
80 | }; | |
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, | |
112 | "%s: id 0x%08x pad#%d: '%s':%d\n", | |
113 | event_name, gobj->id, media_localid(gobj), | |
114 | pad->entity->name, pad->index); | |
27e543fa MCC |
115 | break; |
116 | } | |
117 | case MEDIA_GRAPH_INTF_DEVNODE: | |
118 | { | |
119 | struct media_interface *intf = gobj_to_intf(gobj); | |
120 | struct media_intf_devnode *devnode = intf_to_devnode(intf); | |
121 | ||
122 | dev_dbg(gobj->mdev->dev, | |
123 | "%s: id 0x%08x intf_devnode#%d: %s - major: %d, minor: %d\n", | |
124 | event_name, gobj->id, media_localid(gobj), | |
125 | intf_type(intf), | |
126 | devnode->major, devnode->minor); | |
127 | break; | |
39a956c4 MCC |
128 | } |
129 | } | |
130 | #endif | |
131 | } | |
132 | ||
ec6e4c95 MCC |
133 | /** |
134 | * media_gobj_init - Initialize a graph object | |
135 | * | |
136 | * @mdev: Pointer to the media_device that contains the object | |
137 | * @type: Type of the object | |
138 | * @gobj: Pointer to the object | |
139 | * | |
140 | * This routine initializes the embedded struct media_gobj inside a | |
141 | * media graph object. It is called automatically if media_*_create() | |
142 | * calls are used. However, if the object (entity, link, pad, interface) | |
143 | * is embedded on some other object, this function should be called before | |
144 | * registering the object at the media controller. | |
145 | */ | |
146 | void media_gobj_init(struct media_device *mdev, | |
147 | enum media_gobj_type type, | |
148 | struct media_gobj *gobj) | |
149 | { | |
8f6d368f MCC |
150 | BUG_ON(!mdev); |
151 | ||
39a956c4 MCC |
152 | gobj->mdev = mdev; |
153 | ||
bfab2aac MCC |
154 | /* Create a per-type unique object ID */ |
155 | switch (type) { | |
156 | case MEDIA_GRAPH_ENTITY: | |
157 | gobj->id = media_gobj_gen_id(type, ++mdev->entity_id); | |
158 | break; | |
18710dc6 MCC |
159 | case MEDIA_GRAPH_PAD: |
160 | gobj->id = media_gobj_gen_id(type, ++mdev->pad_id); | |
161 | break; | |
6b6a4278 MCC |
162 | case MEDIA_GRAPH_LINK: |
163 | gobj->id = media_gobj_gen_id(type, ++mdev->link_id); | |
164 | break; | |
27e543fa MCC |
165 | case MEDIA_GRAPH_INTF_DEVNODE: |
166 | gobj->id = media_gobj_gen_id(type, ++mdev->intf_devnode_id); | |
167 | break; | |
bfab2aac | 168 | } |
39a956c4 | 169 | dev_dbg_obj(__func__, gobj); |
ec6e4c95 MCC |
170 | } |
171 | ||
172 | /** | |
173 | * media_gobj_remove - Stop using a graph object on a media device | |
174 | * | |
175 | * @graph_obj: Pointer to the object | |
176 | * | |
177 | * This should be called at media_device_unregister_*() routines | |
178 | */ | |
179 | void media_gobj_remove(struct media_gobj *gobj) | |
180 | { | |
39a956c4 | 181 | dev_dbg_obj(__func__, gobj); |
ec6e4c95 MCC |
182 | } |
183 | ||
53e269c1 LP |
184 | /** |
185 | * media_entity_init - Initialize a media entity | |
186 | * | |
187 | * @num_pads: Total number of sink and source pads. | |
53e269c1 LP |
188 | * @pads: Array of 'num_pads' pads. |
189 | * | |
190 | * The total number of pads is an intrinsic property of entities known by the | |
191 | * entity driver, while the total number of links depends on hardware design | |
192 | * and is an extrinsic property unknown to the entity driver. However, in most | |
18095107 MCC |
193 | * use cases the number of links can safely be assumed to be equal to or |
194 | * larger than the number of pads. | |
53e269c1 | 195 | * |
18095107 MCC |
196 | * For those reasons the links array can be preallocated based on the number |
197 | * of pads and will be reallocated later if extra links need to be created. | |
53e269c1 LP |
198 | * |
199 | * This function allocates a links array with enough space to hold at least | |
18095107 MCC |
200 | * 'num_pads' elements. The media_entity::max_links field will be set to the |
201 | * number of allocated elements. | |
53e269c1 LP |
202 | * |
203 | * The pads array is managed by the entity driver and passed to | |
204 | * media_entity_init() where its pointer will be stored in the entity structure. | |
205 | */ | |
206 | int | |
207 | media_entity_init(struct media_entity *entity, u16 num_pads, | |
18095107 | 208 | struct media_pad *pads) |
53e269c1 | 209 | { |
53e269c1 LP |
210 | unsigned int i; |
211 | ||
53e269c1 | 212 | entity->group_id = 0; |
53e269c1 LP |
213 | entity->num_links = 0; |
214 | entity->num_backlinks = 0; | |
215 | entity->num_pads = num_pads; | |
216 | entity->pads = pads; | |
53e269c1 LP |
217 | |
218 | for (i = 0; i < num_pads; i++) { | |
219 | pads[i].entity = entity; | |
220 | pads[i].index = i; | |
221 | } | |
222 | ||
223 | return 0; | |
224 | } | |
225 | EXPORT_SYMBOL_GPL(media_entity_init); | |
226 | ||
227 | void | |
228 | media_entity_cleanup(struct media_entity *entity) | |
229 | { | |
57208e5e MCC |
230 | struct media_link *link, *tmp; |
231 | ||
232 | list_for_each_entry_safe(link, tmp, &entity->links, list) { | |
233 | media_gobj_remove(&link->graph_obj); | |
234 | list_del(&link->list); | |
235 | kfree(link); | |
236 | } | |
53e269c1 LP |
237 | } |
238 | EXPORT_SYMBOL_GPL(media_entity_cleanup); | |
239 | ||
a5ccc48a SA |
240 | /* ----------------------------------------------------------------------------- |
241 | * Graph traversal | |
242 | */ | |
243 | ||
244 | static struct media_entity * | |
245 | media_entity_other(struct media_entity *entity, struct media_link *link) | |
246 | { | |
247 | if (link->source->entity == entity) | |
248 | return link->sink->entity; | |
249 | else | |
250 | return link->source->entity; | |
251 | } | |
252 | ||
253 | /* push an entity to traversal stack */ | |
254 | static void stack_push(struct media_entity_graph *graph, | |
255 | struct media_entity *entity) | |
256 | { | |
257 | if (graph->top == MEDIA_ENTITY_ENUM_MAX_DEPTH - 1) { | |
258 | WARN_ON(1); | |
259 | return; | |
260 | } | |
261 | graph->top++; | |
57208e5e | 262 | graph->stack[graph->top].link = (&entity->links)->next; |
a5ccc48a SA |
263 | graph->stack[graph->top].entity = entity; |
264 | } | |
265 | ||
266 | static struct media_entity *stack_pop(struct media_entity_graph *graph) | |
267 | { | |
268 | struct media_entity *entity; | |
269 | ||
270 | entity = graph->stack[graph->top].entity; | |
271 | graph->top--; | |
272 | ||
273 | return entity; | |
274 | } | |
275 | ||
a5ccc48a SA |
276 | #define link_top(en) ((en)->stack[(en)->top].link) |
277 | #define stack_top(en) ((en)->stack[(en)->top].entity) | |
278 | ||
279 | /** | |
280 | * media_entity_graph_walk_start - Start walking the media graph at a given entity | |
281 | * @graph: Media graph structure that will be used to walk the graph | |
282 | * @entity: Starting entity | |
283 | * | |
284 | * This function initializes the graph traversal structure to walk the entities | |
285 | * graph starting at the given entity. The traversal structure must not be | |
286 | * modified by the caller during graph traversal. When done the structure can | |
287 | * safely be freed. | |
288 | */ | |
289 | void media_entity_graph_walk_start(struct media_entity_graph *graph, | |
290 | struct media_entity *entity) | |
291 | { | |
292 | graph->top = 0; | |
293 | graph->stack[graph->top].entity = NULL; | |
5c7b25b9 LP |
294 | bitmap_zero(graph->entities, MEDIA_ENTITY_ENUM_MAX_ID); |
295 | ||
fa762394 | 296 | if (WARN_ON(media_entity_id(entity) >= MEDIA_ENTITY_ENUM_MAX_ID)) |
5c7b25b9 LP |
297 | return; |
298 | ||
fa762394 | 299 | __set_bit(media_entity_id(entity), graph->entities); |
a5ccc48a SA |
300 | stack_push(graph, entity); |
301 | } | |
302 | EXPORT_SYMBOL_GPL(media_entity_graph_walk_start); | |
303 | ||
57208e5e | 304 | |
a5ccc48a SA |
305 | /** |
306 | * media_entity_graph_walk_next - Get the next entity in the graph | |
307 | * @graph: Media graph structure | |
308 | * | |
309 | * Perform a depth-first traversal of the given media entities graph. | |
310 | * | |
311 | * The graph structure must have been previously initialized with a call to | |
312 | * media_entity_graph_walk_start(). | |
313 | * | |
314 | * Return the next entity in the graph or NULL if the whole graph have been | |
315 | * traversed. | |
316 | */ | |
317 | struct media_entity * | |
318 | media_entity_graph_walk_next(struct media_entity_graph *graph) | |
319 | { | |
320 | if (stack_top(graph) == NULL) | |
321 | return NULL; | |
322 | ||
323 | /* | |
324 | * Depth first search. Push entity to stack and continue from | |
325 | * top of the stack until no more entities on the level can be | |
326 | * found. | |
327 | */ | |
57208e5e | 328 | while (link_top(graph) != &(stack_top(graph)->links)) { |
a5ccc48a | 329 | struct media_entity *entity = stack_top(graph); |
57208e5e | 330 | struct media_link *link; |
a5ccc48a SA |
331 | struct media_entity *next; |
332 | ||
57208e5e MCC |
333 | link = list_entry(link_top(graph), typeof(*link), list); |
334 | ||
a5ccc48a SA |
335 | /* The link is not enabled so we do not follow. */ |
336 | if (!(link->flags & MEDIA_LNK_FL_ENABLED)) { | |
57208e5e | 337 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
338 | continue; |
339 | } | |
340 | ||
341 | /* Get the entity in the other end of the link . */ | |
342 | next = media_entity_other(entity, link); | |
fa762394 | 343 | if (WARN_ON(media_entity_id(next) >= MEDIA_ENTITY_ENUM_MAX_ID)) |
5c7b25b9 | 344 | return NULL; |
a5ccc48a | 345 | |
5c7b25b9 | 346 | /* Has the entity already been visited? */ |
fa762394 | 347 | if (__test_and_set_bit(media_entity_id(next), graph->entities)) { |
57208e5e | 348 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
349 | continue; |
350 | } | |
351 | ||
352 | /* Push the new entity to stack and start over. */ | |
57208e5e | 353 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
354 | stack_push(graph, next); |
355 | } | |
356 | ||
357 | return stack_pop(graph); | |
358 | } | |
359 | EXPORT_SYMBOL_GPL(media_entity_graph_walk_next); | |
360 | ||
e02188c9 LP |
361 | /* ----------------------------------------------------------------------------- |
362 | * Pipeline management | |
363 | */ | |
364 | ||
365 | /** | |
366 | * media_entity_pipeline_start - Mark a pipeline as streaming | |
367 | * @entity: Starting entity | |
368 | * @pipe: Media pipeline to be assigned to all entities in the pipeline. | |
369 | * | |
370 | * Mark all entities connected to a given entity through enabled links, either | |
371 | * directly or indirectly, as streaming. The given pipeline object is assigned to | |
372 | * every entity in the pipeline and stored in the media_entity pipe field. | |
373 | * | |
374 | * Calls to this function can be nested, in which case the same number of | |
375 | * media_entity_pipeline_stop() calls will be required to stop streaming. The | |
376 | * pipeline pointer must be identical for all nested calls to | |
377 | * media_entity_pipeline_start(). | |
378 | */ | |
af88be38 SA |
379 | __must_check int media_entity_pipeline_start(struct media_entity *entity, |
380 | struct media_pipeline *pipe) | |
e02188c9 | 381 | { |
d10c9894 | 382 | struct media_device *mdev = entity->graph_obj.mdev; |
e02188c9 | 383 | struct media_entity_graph graph; |
af88be38 | 384 | struct media_entity *entity_err = entity; |
57208e5e | 385 | struct media_link *link; |
af88be38 | 386 | int ret; |
e02188c9 LP |
387 | |
388 | mutex_lock(&mdev->graph_mutex); | |
389 | ||
390 | media_entity_graph_walk_start(&graph, entity); | |
391 | ||
392 | while ((entity = media_entity_graph_walk_next(&graph))) { | |
ef69ee1b MCC |
393 | DECLARE_BITMAP(active, MEDIA_ENTITY_MAX_PADS); |
394 | DECLARE_BITMAP(has_no_links, MEDIA_ENTITY_MAX_PADS); | |
af88be38 | 395 | |
e02188c9 LP |
396 | entity->stream_count++; |
397 | WARN_ON(entity->pipe && entity->pipe != pipe); | |
398 | entity->pipe = pipe; | |
af88be38 SA |
399 | |
400 | /* Already streaming --- no need to check. */ | |
401 | if (entity->stream_count > 1) | |
402 | continue; | |
403 | ||
404 | if (!entity->ops || !entity->ops->link_validate) | |
405 | continue; | |
406 | ||
de49c285 SA |
407 | bitmap_zero(active, entity->num_pads); |
408 | bitmap_fill(has_no_links, entity->num_pads); | |
409 | ||
57208e5e | 410 | list_for_each_entry(link, &entity->links, list) { |
de49c285 SA |
411 | struct media_pad *pad = link->sink->entity == entity |
412 | ? link->sink : link->source; | |
413 | ||
414 | /* Mark that a pad is connected by a link. */ | |
415 | bitmap_clear(has_no_links, pad->index, 1); | |
416 | ||
417 | /* | |
418 | * Pads that either do not need to connect or | |
419 | * are connected through an enabled link are | |
420 | * fine. | |
421 | */ | |
422 | if (!(pad->flags & MEDIA_PAD_FL_MUST_CONNECT) || | |
423 | link->flags & MEDIA_LNK_FL_ENABLED) | |
424 | bitmap_set(active, pad->index, 1); | |
425 | ||
426 | /* | |
427 | * Link validation will only take place for | |
428 | * sink ends of the link that are enabled. | |
429 | */ | |
430 | if (link->sink != pad || | |
431 | !(link->flags & MEDIA_LNK_FL_ENABLED)) | |
af88be38 SA |
432 | continue; |
433 | ||
434 | ret = entity->ops->link_validate(link); | |
fab9d30b | 435 | if (ret < 0 && ret != -ENOIOCTLCMD) { |
d10c9894 | 436 | dev_dbg(entity->graph_obj.mdev->dev, |
fab9d30b | 437 | "link validation failed for \"%s\":%u -> \"%s\":%u, error %d\n", |
823ea2a6 SA |
438 | link->source->entity->name, |
439 | link->source->index, | |
440 | entity->name, link->sink->index, ret); | |
af88be38 | 441 | goto error; |
fab9d30b | 442 | } |
af88be38 | 443 | } |
de49c285 SA |
444 | |
445 | /* Either no links or validated links are fine. */ | |
446 | bitmap_or(active, active, has_no_links, entity->num_pads); | |
447 | ||
448 | if (!bitmap_full(active, entity->num_pads)) { | |
449 | ret = -EPIPE; | |
d10c9894 | 450 | dev_dbg(entity->graph_obj.mdev->dev, |
fab9d30b SA |
451 | "\"%s\":%u must be connected by an enabled link\n", |
452 | entity->name, | |
094f1ca5 SA |
453 | (unsigned)find_first_zero_bit( |
454 | active, entity->num_pads)); | |
de49c285 SA |
455 | goto error; |
456 | } | |
e02188c9 LP |
457 | } |
458 | ||
459 | mutex_unlock(&mdev->graph_mutex); | |
af88be38 SA |
460 | |
461 | return 0; | |
462 | ||
463 | error: | |
464 | /* | |
465 | * Link validation on graph failed. We revert what we did and | |
466 | * return the error. | |
467 | */ | |
468 | media_entity_graph_walk_start(&graph, entity_err); | |
469 | ||
470 | while ((entity_err = media_entity_graph_walk_next(&graph))) { | |
471 | entity_err->stream_count--; | |
472 | if (entity_err->stream_count == 0) | |
473 | entity_err->pipe = NULL; | |
474 | ||
475 | /* | |
476 | * We haven't increased stream_count further than this | |
477 | * so we quit here. | |
478 | */ | |
479 | if (entity_err == entity) | |
480 | break; | |
481 | } | |
482 | ||
483 | mutex_unlock(&mdev->graph_mutex); | |
484 | ||
485 | return ret; | |
e02188c9 LP |
486 | } |
487 | EXPORT_SYMBOL_GPL(media_entity_pipeline_start); | |
488 | ||
489 | /** | |
490 | * media_entity_pipeline_stop - Mark a pipeline as not streaming | |
491 | * @entity: Starting entity | |
492 | * | |
493 | * Mark all entities connected to a given entity through enabled links, either | |
494 | * directly or indirectly, as not streaming. The media_entity pipe field is | |
495 | * reset to NULL. | |
496 | * | |
497 | * If multiple calls to media_entity_pipeline_start() have been made, the same | |
498 | * number of calls to this function are required to mark the pipeline as not | |
499 | * streaming. | |
500 | */ | |
501 | void media_entity_pipeline_stop(struct media_entity *entity) | |
502 | { | |
d10c9894 | 503 | struct media_device *mdev = entity->graph_obj.mdev; |
e02188c9 LP |
504 | struct media_entity_graph graph; |
505 | ||
506 | mutex_lock(&mdev->graph_mutex); | |
507 | ||
508 | media_entity_graph_walk_start(&graph, entity); | |
509 | ||
510 | while ((entity = media_entity_graph_walk_next(&graph))) { | |
511 | entity->stream_count--; | |
512 | if (entity->stream_count == 0) | |
513 | entity->pipe = NULL; | |
514 | } | |
515 | ||
516 | mutex_unlock(&mdev->graph_mutex); | |
517 | } | |
518 | EXPORT_SYMBOL_GPL(media_entity_pipeline_stop); | |
519 | ||
503c3d82 LP |
520 | /* ----------------------------------------------------------------------------- |
521 | * Module use count | |
522 | */ | |
523 | ||
524 | /* | |
525 | * media_entity_get - Get a reference to the parent module | |
526 | * @entity: The entity | |
527 | * | |
528 | * Get a reference to the parent media device module. | |
529 | * | |
530 | * The function will return immediately if @entity is NULL. | |
531 | * | |
532 | * Return a pointer to the entity on success or NULL on failure. | |
533 | */ | |
534 | struct media_entity *media_entity_get(struct media_entity *entity) | |
535 | { | |
536 | if (entity == NULL) | |
537 | return NULL; | |
538 | ||
d10c9894 JMC |
539 | if (entity->graph_obj.mdev->dev && |
540 | !try_module_get(entity->graph_obj.mdev->dev->driver->owner)) | |
503c3d82 LP |
541 | return NULL; |
542 | ||
543 | return entity; | |
544 | } | |
545 | EXPORT_SYMBOL_GPL(media_entity_get); | |
546 | ||
547 | /* | |
548 | * media_entity_put - Release the reference to the parent module | |
549 | * @entity: The entity | |
550 | * | |
551 | * Release the reference count acquired by media_entity_get(). | |
552 | * | |
553 | * The function will return immediately if @entity is NULL. | |
554 | */ | |
555 | void media_entity_put(struct media_entity *entity) | |
556 | { | |
557 | if (entity == NULL) | |
558 | return; | |
559 | ||
d10c9894 JMC |
560 | if (entity->graph_obj.mdev->dev) |
561 | module_put(entity->graph_obj.mdev->dev->driver->owner); | |
503c3d82 LP |
562 | } |
563 | EXPORT_SYMBOL_GPL(media_entity_put); | |
564 | ||
a5ccc48a SA |
565 | /* ----------------------------------------------------------------------------- |
566 | * Links management | |
567 | */ | |
568 | ||
23615de5 | 569 | static struct media_link *media_add_link(struct list_head *head) |
53e269c1 | 570 | { |
57208e5e | 571 | struct media_link *link; |
53e269c1 | 572 | |
57208e5e MCC |
573 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
574 | if (link == NULL) | |
575 | return NULL; | |
53e269c1 | 576 | |
23615de5 | 577 | list_add_tail(&link->list, head); |
53e269c1 | 578 | |
57208e5e | 579 | return link; |
53e269c1 LP |
580 | } |
581 | ||
57208e5e MCC |
582 | static void __media_entity_remove_link(struct media_entity *entity, |
583 | struct media_link *link); | |
584 | ||
53e269c1 | 585 | int |
8df00a15 | 586 | media_create_pad_link(struct media_entity *source, u16 source_pad, |
53e269c1 LP |
587 | struct media_entity *sink, u16 sink_pad, u32 flags) |
588 | { | |
589 | struct media_link *link; | |
590 | struct media_link *backlink; | |
591 | ||
592 | BUG_ON(source == NULL || sink == NULL); | |
593 | BUG_ON(source_pad >= source->num_pads); | |
594 | BUG_ON(sink_pad >= sink->num_pads); | |
595 | ||
23615de5 | 596 | link = media_add_link(&source->links); |
53e269c1 LP |
597 | if (link == NULL) |
598 | return -ENOMEM; | |
599 | ||
600 | link->source = &source->pads[source_pad]; | |
601 | link->sink = &sink->pads[sink_pad]; | |
602 | link->flags = flags; | |
603 | ||
6b6a4278 | 604 | /* Initialize graph object embedded at the new link */ |
d10c9894 JMC |
605 | media_gobj_init(source->graph_obj.mdev, MEDIA_GRAPH_LINK, |
606 | &link->graph_obj); | |
6b6a4278 | 607 | |
53e269c1 LP |
608 | /* Create the backlink. Backlinks are used to help graph traversal and |
609 | * are not reported to userspace. | |
610 | */ | |
23615de5 | 611 | backlink = media_add_link(&sink->links); |
53e269c1 | 612 | if (backlink == NULL) { |
57208e5e | 613 | __media_entity_remove_link(source, link); |
53e269c1 LP |
614 | return -ENOMEM; |
615 | } | |
616 | ||
617 | backlink->source = &source->pads[source_pad]; | |
618 | backlink->sink = &sink->pads[sink_pad]; | |
619 | backlink->flags = flags; | |
620 | ||
6b6a4278 | 621 | /* Initialize graph object embedded at the new link */ |
d10c9894 JMC |
622 | media_gobj_init(sink->graph_obj.mdev, MEDIA_GRAPH_LINK, |
623 | &backlink->graph_obj); | |
6b6a4278 | 624 | |
53e269c1 LP |
625 | link->reverse = backlink; |
626 | backlink->reverse = link; | |
627 | ||
628 | sink->num_backlinks++; | |
57208e5e MCC |
629 | sink->num_links++; |
630 | source->num_links++; | |
53e269c1 LP |
631 | |
632 | return 0; | |
633 | } | |
8df00a15 | 634 | EXPORT_SYMBOL_GPL(media_create_pad_link); |
97548ed4 | 635 | |
57208e5e MCC |
636 | static void __media_entity_remove_link(struct media_entity *entity, |
637 | struct media_link *link) | |
7349cec1 | 638 | { |
57208e5e MCC |
639 | struct media_link *rlink, *tmp; |
640 | struct media_entity *remote; | |
641 | unsigned int r = 0; | |
642 | ||
643 | if (link->source->entity == entity) | |
644 | remote = link->sink->entity; | |
645 | else | |
646 | remote = link->source->entity; | |
7349cec1 | 647 | |
57208e5e MCC |
648 | list_for_each_entry_safe(rlink, tmp, &remote->links, list) { |
649 | if (rlink != link->reverse) { | |
650 | r++; | |
651 | continue; | |
652 | } | |
7349cec1 SN |
653 | |
654 | if (link->source->entity == entity) | |
57208e5e | 655 | remote->num_backlinks--; |
7349cec1 | 656 | |
57208e5e MCC |
657 | if (--remote->num_links == 0) |
658 | break; | |
7349cec1 | 659 | |
57208e5e MCC |
660 | /* Remove the remote link */ |
661 | list_del(&rlink->list); | |
662 | kfree(rlink); | |
663 | } | |
664 | list_del(&link->list); | |
665 | kfree(link); | |
666 | } | |
7349cec1 | 667 | |
57208e5e MCC |
668 | void __media_entity_remove_links(struct media_entity *entity) |
669 | { | |
670 | struct media_link *link, *tmp; | |
7349cec1 | 671 | |
57208e5e MCC |
672 | list_for_each_entry_safe(link, tmp, &entity->links, list) |
673 | __media_entity_remove_link(entity, link); | |
7349cec1 SN |
674 | |
675 | entity->num_links = 0; | |
676 | entity->num_backlinks = 0; | |
677 | } | |
678 | EXPORT_SYMBOL_GPL(__media_entity_remove_links); | |
679 | ||
680 | void media_entity_remove_links(struct media_entity *entity) | |
681 | { | |
682 | /* Do nothing if the entity is not registered. */ | |
d10c9894 | 683 | if (entity->graph_obj.mdev == NULL) |
7349cec1 SN |
684 | return; |
685 | ||
d10c9894 | 686 | mutex_lock(&entity->graph_obj.mdev->graph_mutex); |
7349cec1 | 687 | __media_entity_remove_links(entity); |
d10c9894 | 688 | mutex_unlock(&entity->graph_obj.mdev->graph_mutex); |
7349cec1 SN |
689 | } |
690 | EXPORT_SYMBOL_GPL(media_entity_remove_links); | |
691 | ||
97548ed4 LP |
692 | static int __media_entity_setup_link_notify(struct media_link *link, u32 flags) |
693 | { | |
97548ed4 LP |
694 | int ret; |
695 | ||
696 | /* Notify both entities. */ | |
697 | ret = media_entity_call(link->source->entity, link_setup, | |
698 | link->source, link->sink, flags); | |
699 | if (ret < 0 && ret != -ENOIOCTLCMD) | |
700 | return ret; | |
701 | ||
702 | ret = media_entity_call(link->sink->entity, link_setup, | |
703 | link->sink, link->source, flags); | |
704 | if (ret < 0 && ret != -ENOIOCTLCMD) { | |
705 | media_entity_call(link->source->entity, link_setup, | |
706 | link->source, link->sink, link->flags); | |
707 | return ret; | |
708 | } | |
709 | ||
7a6f0b22 | 710 | link->flags = flags; |
97548ed4 LP |
711 | link->reverse->flags = link->flags; |
712 | ||
713 | return 0; | |
714 | } | |
715 | ||
716 | /** | |
717 | * __media_entity_setup_link - Configure a media link | |
718 | * @link: The link being configured | |
719 | * @flags: Link configuration flags | |
720 | * | |
721 | * The bulk of link setup is handled by the two entities connected through the | |
722 | * link. This function notifies both entities of the link configuration change. | |
723 | * | |
724 | * If the link is immutable or if the current and new configuration are | |
725 | * identical, return immediately. | |
726 | * | |
727 | * The user is expected to hold link->source->parent->mutex. If not, | |
728 | * media_entity_setup_link() should be used instead. | |
729 | */ | |
730 | int __media_entity_setup_link(struct media_link *link, u32 flags) | |
731 | { | |
7a6f0b22 | 732 | const u32 mask = MEDIA_LNK_FL_ENABLED; |
97548ed4 LP |
733 | struct media_device *mdev; |
734 | struct media_entity *source, *sink; | |
735 | int ret = -EBUSY; | |
736 | ||
737 | if (link == NULL) | |
738 | return -EINVAL; | |
739 | ||
7a6f0b22 LP |
740 | /* The non-modifiable link flags must not be modified. */ |
741 | if ((link->flags & ~mask) != (flags & ~mask)) | |
742 | return -EINVAL; | |
743 | ||
97548ed4 LP |
744 | if (link->flags & MEDIA_LNK_FL_IMMUTABLE) |
745 | return link->flags == flags ? 0 : -EINVAL; | |
746 | ||
747 | if (link->flags == flags) | |
748 | return 0; | |
749 | ||
750 | source = link->source->entity; | |
751 | sink = link->sink->entity; | |
752 | ||
e02188c9 LP |
753 | if (!(link->flags & MEDIA_LNK_FL_DYNAMIC) && |
754 | (source->stream_count || sink->stream_count)) | |
755 | return -EBUSY; | |
756 | ||
d10c9894 | 757 | mdev = source->graph_obj.mdev; |
97548ed4 | 758 | |
813f5c0a SN |
759 | if (mdev->link_notify) { |
760 | ret = mdev->link_notify(link, flags, | |
761 | MEDIA_DEV_NOTIFY_PRE_LINK_CH); | |
97548ed4 LP |
762 | if (ret < 0) |
763 | return ret; | |
764 | } | |
765 | ||
766 | ret = __media_entity_setup_link_notify(link, flags); | |
97548ed4 | 767 | |
813f5c0a SN |
768 | if (mdev->link_notify) |
769 | mdev->link_notify(link, flags, MEDIA_DEV_NOTIFY_POST_LINK_CH); | |
97548ed4 LP |
770 | |
771 | return ret; | |
772 | } | |
773 | ||
774 | int media_entity_setup_link(struct media_link *link, u32 flags) | |
775 | { | |
776 | int ret; | |
777 | ||
d10c9894 | 778 | mutex_lock(&link->source->entity->graph_obj.mdev->graph_mutex); |
97548ed4 | 779 | ret = __media_entity_setup_link(link, flags); |
d10c9894 | 780 | mutex_unlock(&link->source->entity->graph_obj.mdev->graph_mutex); |
97548ed4 LP |
781 | |
782 | return ret; | |
783 | } | |
784 | EXPORT_SYMBOL_GPL(media_entity_setup_link); | |
785 | ||
786 | /** | |
787 | * media_entity_find_link - Find a link between two pads | |
788 | * @source: Source pad | |
789 | * @sink: Sink pad | |
790 | * | |
791 | * Return a pointer to the link between the two entities. If no such link | |
792 | * exists, return NULL. | |
793 | */ | |
794 | struct media_link * | |
795 | media_entity_find_link(struct media_pad *source, struct media_pad *sink) | |
796 | { | |
797 | struct media_link *link; | |
97548ed4 | 798 | |
57208e5e | 799 | list_for_each_entry(link, &source->entity->links, list) { |
97548ed4 LP |
800 | if (link->source->entity == source->entity && |
801 | link->source->index == source->index && | |
802 | link->sink->entity == sink->entity && | |
803 | link->sink->index == sink->index) | |
804 | return link; | |
805 | } | |
806 | ||
807 | return NULL; | |
808 | } | |
809 | EXPORT_SYMBOL_GPL(media_entity_find_link); | |
810 | ||
811 | /** | |
1bddf1b3 AH |
812 | * media_entity_remote_pad - Find the pad at the remote end of a link |
813 | * @pad: Pad at the local end of the link | |
97548ed4 | 814 | * |
1bddf1b3 AH |
815 | * Search for a remote pad connected to the given pad by iterating over all |
816 | * links originating or terminating at that pad until an enabled link is found. | |
97548ed4 LP |
817 | * |
818 | * Return a pointer to the pad at the remote end of the first found enabled | |
819 | * link, or NULL if no enabled link has been found. | |
820 | */ | |
1bddf1b3 | 821 | struct media_pad *media_entity_remote_pad(struct media_pad *pad) |
97548ed4 | 822 | { |
57208e5e | 823 | struct media_link *link; |
97548ed4 | 824 | |
57208e5e | 825 | list_for_each_entry(link, &pad->entity->links, list) { |
97548ed4 LP |
826 | if (!(link->flags & MEDIA_LNK_FL_ENABLED)) |
827 | continue; | |
828 | ||
829 | if (link->source == pad) | |
830 | return link->sink; | |
831 | ||
832 | if (link->sink == pad) | |
833 | return link->source; | |
834 | } | |
835 | ||
836 | return NULL; | |
837 | ||
838 | } | |
1bddf1b3 | 839 | EXPORT_SYMBOL_GPL(media_entity_remote_pad); |
27e543fa MCC |
840 | |
841 | ||
1283f849 MCC |
842 | static void media_interface_init(struct media_device *mdev, |
843 | struct media_interface *intf, | |
844 | u32 gobj_type, | |
845 | u32 intf_type, u32 flags) | |
846 | { | |
847 | intf->type = intf_type; | |
848 | intf->flags = flags; | |
849 | INIT_LIST_HEAD(&intf->links); | |
850 | ||
851 | media_gobj_init(mdev, gobj_type, &intf->graph_obj); | |
57cf79b7 MCC |
852 | |
853 | list_add_tail(&intf->list, &mdev->interfaces); | |
1283f849 MCC |
854 | } |
855 | ||
27e543fa MCC |
856 | /* Functions related to the media interface via device nodes */ |
857 | ||
858 | struct media_intf_devnode *media_devnode_create(struct media_device *mdev, | |
859 | u32 type, u32 flags, | |
860 | u32 major, u32 minor, | |
861 | gfp_t gfp_flags) | |
862 | { | |
863 | struct media_intf_devnode *devnode; | |
27e543fa MCC |
864 | |
865 | devnode = kzalloc(sizeof(*devnode), gfp_flags); | |
866 | if (!devnode) | |
867 | return NULL; | |
868 | ||
27e543fa MCC |
869 | devnode->major = major; |
870 | devnode->minor = minor; | |
871 | ||
1283f849 MCC |
872 | media_interface_init(mdev, &devnode->intf, MEDIA_GRAPH_INTF_DEVNODE, |
873 | type, flags); | |
27e543fa MCC |
874 | |
875 | return devnode; | |
876 | } | |
877 | EXPORT_SYMBOL_GPL(media_devnode_create); | |
878 | ||
879 | void media_devnode_remove(struct media_intf_devnode *devnode) | |
880 | { | |
881 | media_gobj_remove(&devnode->intf.graph_obj); | |
57cf79b7 | 882 | list_del(&devnode->intf.list); |
27e543fa MCC |
883 | kfree(devnode); |
884 | } | |
885 | EXPORT_SYMBOL_GPL(media_devnode_remove); | |
86e26620 MCC |
886 | |
887 | struct media_link *media_create_intf_link(struct media_entity *entity, | |
888 | struct media_interface *intf, | |
889 | u32 flags) | |
890 | { | |
891 | struct media_link *link; | |
892 | ||
893 | link = media_add_link(&intf->links); | |
894 | if (link == NULL) | |
895 | return NULL; | |
896 | ||
897 | link->intf = intf; | |
898 | link->entity = entity; | |
899 | link->flags = flags; | |
900 | ||
901 | /* Initialize graph object embedded at the new link */ | |
902 | media_gobj_init(intf->graph_obj.mdev, MEDIA_GRAPH_LINK, | |
903 | &link->graph_obj); | |
904 | ||
905 | return link; | |
906 | } | |
907 | EXPORT_SYMBOL_GPL(media_create_intf_link); | |
908 | ||
909 | ||
910 | static void __media_remove_intf_link(struct media_link *link) | |
911 | { | |
912 | media_gobj_remove(&link->graph_obj); | |
913 | kfree(link); | |
914 | } | |
915 | ||
916 | void media_remove_intf_link(struct media_link *link) | |
917 | { | |
918 | mutex_lock(&link->graph_obj.mdev->graph_mutex); | |
919 | __media_remove_intf_link(link); | |
920 | mutex_unlock(&link->graph_obj.mdev->graph_mutex); | |
921 | } | |
922 | EXPORT_SYMBOL_GPL(media_remove_intf_link); |