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 | /** |
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, | |
97 | "%s: id 0x%08x link#%d: '%s' %s#%d ==> '%s' %s#%d\n", | |
98 | event_name, gobj->id, media_localid(gobj), | |
99 | ||
100 | link->source->entity->name, | |
101 | gobj_type(media_type(&link->source->graph_obj)), | |
102 | media_localid(&link->source->graph_obj), | |
103 | ||
104 | link->sink->entity->name, | |
105 | gobj_type(media_type(&link->sink->graph_obj)), | |
106 | media_localid(&link->sink->graph_obj)); | |
107 | break; | |
108 | } | |
109 | case MEDIA_GRAPH_PAD: | |
110 | { | |
111 | struct media_pad *pad = gobj_to_pad(gobj); | |
112 | ||
113 | dev_dbg(gobj->mdev->dev, | |
114 | "%s: id 0x%08x pad#%d: '%s':%d\n", | |
115 | event_name, gobj->id, media_localid(gobj), | |
116 | pad->entity->name, pad->index); | |
27e543fa MCC |
117 | break; |
118 | } | |
119 | case MEDIA_GRAPH_INTF_DEVNODE: | |
120 | { | |
121 | struct media_interface *intf = gobj_to_intf(gobj); | |
122 | struct media_intf_devnode *devnode = intf_to_devnode(intf); | |
123 | ||
124 | dev_dbg(gobj->mdev->dev, | |
125 | "%s: id 0x%08x intf_devnode#%d: %s - major: %d, minor: %d\n", | |
126 | event_name, gobj->id, media_localid(gobj), | |
127 | intf_type(intf), | |
128 | devnode->major, devnode->minor); | |
129 | break; | |
39a956c4 MCC |
130 | } |
131 | } | |
132 | #endif | |
133 | } | |
134 | ||
ec6e4c95 MCC |
135 | /** |
136 | * media_gobj_init - Initialize a graph object | |
137 | * | |
138 | * @mdev: Pointer to the media_device that contains the object | |
139 | * @type: Type of the object | |
140 | * @gobj: Pointer to the object | |
141 | * | |
142 | * This routine initializes the embedded struct media_gobj inside a | |
143 | * media graph object. It is called automatically if media_*_create() | |
144 | * calls are used. However, if the object (entity, link, pad, interface) | |
145 | * is embedded on some other object, this function should be called before | |
146 | * registering the object at the media controller. | |
147 | */ | |
148 | void media_gobj_init(struct media_device *mdev, | |
149 | enum media_gobj_type type, | |
150 | struct media_gobj *gobj) | |
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 LP |
209 | { |
210 | struct media_link *links; | |
18095107 | 211 | unsigned int max_links = num_pads; |
53e269c1 LP |
212 | unsigned int i; |
213 | ||
214 | links = kzalloc(max_links * sizeof(links[0]), GFP_KERNEL); | |
215 | if (links == NULL) | |
216 | return -ENOMEM; | |
217 | ||
218 | entity->group_id = 0; | |
219 | entity->max_links = max_links; | |
220 | entity->num_links = 0; | |
221 | entity->num_backlinks = 0; | |
222 | entity->num_pads = num_pads; | |
223 | entity->pads = pads; | |
224 | entity->links = links; | |
225 | ||
226 | for (i = 0; i < num_pads; i++) { | |
227 | pads[i].entity = entity; | |
228 | pads[i].index = i; | |
229 | } | |
230 | ||
231 | return 0; | |
232 | } | |
233 | EXPORT_SYMBOL_GPL(media_entity_init); | |
234 | ||
235 | void | |
236 | media_entity_cleanup(struct media_entity *entity) | |
237 | { | |
238 | kfree(entity->links); | |
239 | } | |
240 | EXPORT_SYMBOL_GPL(media_entity_cleanup); | |
241 | ||
a5ccc48a SA |
242 | /* ----------------------------------------------------------------------------- |
243 | * Graph traversal | |
244 | */ | |
245 | ||
246 | static struct media_entity * | |
247 | media_entity_other(struct media_entity *entity, struct media_link *link) | |
248 | { | |
249 | if (link->source->entity == entity) | |
250 | return link->sink->entity; | |
251 | else | |
252 | return link->source->entity; | |
253 | } | |
254 | ||
255 | /* push an entity to traversal stack */ | |
256 | static void stack_push(struct media_entity_graph *graph, | |
257 | struct media_entity *entity) | |
258 | { | |
259 | if (graph->top == MEDIA_ENTITY_ENUM_MAX_DEPTH - 1) { | |
260 | WARN_ON(1); | |
261 | return; | |
262 | } | |
263 | graph->top++; | |
264 | graph->stack[graph->top].link = 0; | |
265 | graph->stack[graph->top].entity = entity; | |
266 | } | |
267 | ||
268 | static struct media_entity *stack_pop(struct media_entity_graph *graph) | |
269 | { | |
270 | struct media_entity *entity; | |
271 | ||
272 | entity = graph->stack[graph->top].entity; | |
273 | graph->top--; | |
274 | ||
275 | return entity; | |
276 | } | |
277 | ||
a5ccc48a SA |
278 | #define link_top(en) ((en)->stack[(en)->top].link) |
279 | #define stack_top(en) ((en)->stack[(en)->top].entity) | |
280 | ||
281 | /** | |
282 | * media_entity_graph_walk_start - Start walking the media graph at a given entity | |
283 | * @graph: Media graph structure that will be used to walk the graph | |
284 | * @entity: Starting entity | |
285 | * | |
286 | * This function initializes the graph traversal structure to walk the entities | |
287 | * graph starting at the given entity. The traversal structure must not be | |
288 | * modified by the caller during graph traversal. When done the structure can | |
289 | * safely be freed. | |
290 | */ | |
291 | void media_entity_graph_walk_start(struct media_entity_graph *graph, | |
292 | struct media_entity *entity) | |
293 | { | |
294 | graph->top = 0; | |
295 | graph->stack[graph->top].entity = NULL; | |
5c7b25b9 LP |
296 | bitmap_zero(graph->entities, MEDIA_ENTITY_ENUM_MAX_ID); |
297 | ||
fa762394 | 298 | if (WARN_ON(media_entity_id(entity) >= MEDIA_ENTITY_ENUM_MAX_ID)) |
5c7b25b9 LP |
299 | return; |
300 | ||
fa762394 | 301 | __set_bit(media_entity_id(entity), graph->entities); |
a5ccc48a SA |
302 | stack_push(graph, entity); |
303 | } | |
304 | EXPORT_SYMBOL_GPL(media_entity_graph_walk_start); | |
305 | ||
306 | /** | |
307 | * media_entity_graph_walk_next - Get the next entity in the graph | |
308 | * @graph: Media graph structure | |
309 | * | |
310 | * Perform a depth-first traversal of the given media entities graph. | |
311 | * | |
312 | * The graph structure must have been previously initialized with a call to | |
313 | * media_entity_graph_walk_start(). | |
314 | * | |
315 | * Return the next entity in the graph or NULL if the whole graph have been | |
316 | * traversed. | |
317 | */ | |
318 | struct media_entity * | |
319 | media_entity_graph_walk_next(struct media_entity_graph *graph) | |
320 | { | |
321 | if (stack_top(graph) == NULL) | |
322 | return NULL; | |
323 | ||
324 | /* | |
325 | * Depth first search. Push entity to stack and continue from | |
326 | * top of the stack until no more entities on the level can be | |
327 | * found. | |
328 | */ | |
329 | while (link_top(graph) < stack_top(graph)->num_links) { | |
330 | struct media_entity *entity = stack_top(graph); | |
331 | struct media_link *link = &entity->links[link_top(graph)]; | |
332 | struct media_entity *next; | |
333 | ||
334 | /* The link is not enabled so we do not follow. */ | |
335 | if (!(link->flags & MEDIA_LNK_FL_ENABLED)) { | |
336 | link_top(graph)++; | |
337 | continue; | |
338 | } | |
339 | ||
340 | /* Get the entity in the other end of the link . */ | |
341 | next = media_entity_other(entity, link); | |
fa762394 | 342 | if (WARN_ON(media_entity_id(next) >= MEDIA_ENTITY_ENUM_MAX_ID)) |
5c7b25b9 | 343 | return NULL; |
a5ccc48a | 344 | |
5c7b25b9 | 345 | /* Has the entity already been visited? */ |
fa762394 | 346 | if (__test_and_set_bit(media_entity_id(next), graph->entities)) { |
a5ccc48a SA |
347 | link_top(graph)++; |
348 | continue; | |
349 | } | |
350 | ||
351 | /* Push the new entity to stack and start over. */ | |
352 | link_top(graph)++; | |
353 | stack_push(graph, next); | |
354 | } | |
355 | ||
356 | return stack_pop(graph); | |
357 | } | |
358 | EXPORT_SYMBOL_GPL(media_entity_graph_walk_next); | |
359 | ||
e02188c9 LP |
360 | /* ----------------------------------------------------------------------------- |
361 | * Pipeline management | |
362 | */ | |
363 | ||
364 | /** | |
365 | * media_entity_pipeline_start - Mark a pipeline as streaming | |
366 | * @entity: Starting entity | |
367 | * @pipe: Media pipeline to be assigned to all entities in the pipeline. | |
368 | * | |
369 | * Mark all entities connected to a given entity through enabled links, either | |
370 | * directly or indirectly, as streaming. The given pipeline object is assigned to | |
371 | * every entity in the pipeline and stored in the media_entity pipe field. | |
372 | * | |
373 | * Calls to this function can be nested, in which case the same number of | |
374 | * media_entity_pipeline_stop() calls will be required to stop streaming. The | |
375 | * pipeline pointer must be identical for all nested calls to | |
376 | * media_entity_pipeline_start(). | |
377 | */ | |
af88be38 SA |
378 | __must_check int media_entity_pipeline_start(struct media_entity *entity, |
379 | struct media_pipeline *pipe) | |
e02188c9 | 380 | { |
d10c9894 | 381 | struct media_device *mdev = entity->graph_obj.mdev; |
e02188c9 | 382 | struct media_entity_graph graph; |
af88be38 SA |
383 | struct media_entity *entity_err = entity; |
384 | int ret; | |
e02188c9 LP |
385 | |
386 | mutex_lock(&mdev->graph_mutex); | |
387 | ||
388 | media_entity_graph_walk_start(&graph, entity); | |
389 | ||
390 | while ((entity = media_entity_graph_walk_next(&graph))) { | |
ef69ee1b MCC |
391 | DECLARE_BITMAP(active, MEDIA_ENTITY_MAX_PADS); |
392 | DECLARE_BITMAP(has_no_links, MEDIA_ENTITY_MAX_PADS); | |
af88be38 SA |
393 | unsigned int i; |
394 | ||
e02188c9 LP |
395 | entity->stream_count++; |
396 | WARN_ON(entity->pipe && entity->pipe != pipe); | |
397 | entity->pipe = pipe; | |
af88be38 SA |
398 | |
399 | /* Already streaming --- no need to check. */ | |
400 | if (entity->stream_count > 1) | |
401 | continue; | |
402 | ||
403 | if (!entity->ops || !entity->ops->link_validate) | |
404 | continue; | |
405 | ||
de49c285 SA |
406 | bitmap_zero(active, entity->num_pads); |
407 | bitmap_fill(has_no_links, entity->num_pads); | |
408 | ||
af88be38 SA |
409 | for (i = 0; i < entity->num_links; i++) { |
410 | struct media_link *link = &entity->links[i]; | |
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 | ||
53e269c1 LP |
569 | static struct media_link *media_entity_add_link(struct media_entity *entity) |
570 | { | |
571 | if (entity->num_links >= entity->max_links) { | |
572 | struct media_link *links = entity->links; | |
573 | unsigned int max_links = entity->max_links + 2; | |
574 | unsigned int i; | |
575 | ||
576 | links = krealloc(links, max_links * sizeof(*links), GFP_KERNEL); | |
577 | if (links == NULL) | |
578 | return NULL; | |
579 | ||
580 | for (i = 0; i < entity->num_links; i++) | |
581 | links[i].reverse->reverse = &links[i]; | |
582 | ||
583 | entity->max_links = max_links; | |
584 | entity->links = links; | |
585 | } | |
586 | ||
587 | return &entity->links[entity->num_links++]; | |
588 | } | |
589 | ||
590 | int | |
8df00a15 | 591 | media_create_pad_link(struct media_entity *source, u16 source_pad, |
53e269c1 LP |
592 | struct media_entity *sink, u16 sink_pad, u32 flags) |
593 | { | |
594 | struct media_link *link; | |
595 | struct media_link *backlink; | |
596 | ||
597 | BUG_ON(source == NULL || sink == NULL); | |
598 | BUG_ON(source_pad >= source->num_pads); | |
599 | BUG_ON(sink_pad >= sink->num_pads); | |
600 | ||
601 | link = media_entity_add_link(source); | |
602 | if (link == NULL) | |
603 | return -ENOMEM; | |
604 | ||
605 | link->source = &source->pads[source_pad]; | |
606 | link->sink = &sink->pads[sink_pad]; | |
607 | link->flags = flags; | |
608 | ||
6b6a4278 | 609 | /* Initialize graph object embedded at the new link */ |
d10c9894 JMC |
610 | media_gobj_init(source->graph_obj.mdev, MEDIA_GRAPH_LINK, |
611 | &link->graph_obj); | |
6b6a4278 | 612 | |
53e269c1 LP |
613 | /* Create the backlink. Backlinks are used to help graph traversal and |
614 | * are not reported to userspace. | |
615 | */ | |
616 | backlink = media_entity_add_link(sink); | |
617 | if (backlink == NULL) { | |
618 | source->num_links--; | |
619 | return -ENOMEM; | |
620 | } | |
621 | ||
622 | backlink->source = &source->pads[source_pad]; | |
623 | backlink->sink = &sink->pads[sink_pad]; | |
624 | backlink->flags = flags; | |
625 | ||
6b6a4278 | 626 | /* Initialize graph object embedded at the new link */ |
d10c9894 JMC |
627 | media_gobj_init(sink->graph_obj.mdev, MEDIA_GRAPH_LINK, |
628 | &backlink->graph_obj); | |
6b6a4278 | 629 | |
53e269c1 LP |
630 | link->reverse = backlink; |
631 | backlink->reverse = link; | |
632 | ||
633 | sink->num_backlinks++; | |
634 | ||
635 | return 0; | |
636 | } | |
8df00a15 | 637 | EXPORT_SYMBOL_GPL(media_create_pad_link); |
97548ed4 | 638 | |
7349cec1 SN |
639 | void __media_entity_remove_links(struct media_entity *entity) |
640 | { | |
641 | unsigned int i; | |
642 | ||
643 | for (i = 0; i < entity->num_links; i++) { | |
644 | struct media_link *link = &entity->links[i]; | |
645 | struct media_entity *remote; | |
646 | unsigned int r = 0; | |
647 | ||
648 | if (link->source->entity == entity) | |
649 | remote = link->sink->entity; | |
650 | else | |
651 | remote = link->source->entity; | |
652 | ||
653 | while (r < remote->num_links) { | |
654 | struct media_link *rlink = &remote->links[r]; | |
655 | ||
656 | if (rlink != link->reverse) { | |
657 | r++; | |
658 | continue; | |
659 | } | |
660 | ||
661 | if (link->source->entity == entity) | |
662 | remote->num_backlinks--; | |
663 | ||
664 | if (--remote->num_links == 0) | |
665 | break; | |
666 | ||
667 | /* Insert last entry in place of the dropped link. */ | |
668 | *rlink = remote->links[remote->num_links]; | |
669 | } | |
670 | } | |
671 | ||
672 | entity->num_links = 0; | |
673 | entity->num_backlinks = 0; | |
674 | } | |
675 | EXPORT_SYMBOL_GPL(__media_entity_remove_links); | |
676 | ||
677 | void media_entity_remove_links(struct media_entity *entity) | |
678 | { | |
679 | /* Do nothing if the entity is not registered. */ | |
d10c9894 | 680 | if (entity->graph_obj.mdev == NULL) |
7349cec1 SN |
681 | return; |
682 | ||
d10c9894 | 683 | mutex_lock(&entity->graph_obj.mdev->graph_mutex); |
7349cec1 | 684 | __media_entity_remove_links(entity); |
d10c9894 | 685 | mutex_unlock(&entity->graph_obj.mdev->graph_mutex); |
7349cec1 SN |
686 | } |
687 | EXPORT_SYMBOL_GPL(media_entity_remove_links); | |
688 | ||
97548ed4 LP |
689 | static int __media_entity_setup_link_notify(struct media_link *link, u32 flags) |
690 | { | |
97548ed4 LP |
691 | int ret; |
692 | ||
693 | /* Notify both entities. */ | |
694 | ret = media_entity_call(link->source->entity, link_setup, | |
695 | link->source, link->sink, flags); | |
696 | if (ret < 0 && ret != -ENOIOCTLCMD) | |
697 | return ret; | |
698 | ||
699 | ret = media_entity_call(link->sink->entity, link_setup, | |
700 | link->sink, link->source, flags); | |
701 | if (ret < 0 && ret != -ENOIOCTLCMD) { | |
702 | media_entity_call(link->source->entity, link_setup, | |
703 | link->source, link->sink, link->flags); | |
704 | return ret; | |
705 | } | |
706 | ||
7a6f0b22 | 707 | link->flags = flags; |
97548ed4 LP |
708 | link->reverse->flags = link->flags; |
709 | ||
710 | return 0; | |
711 | } | |
712 | ||
713 | /** | |
714 | * __media_entity_setup_link - Configure a media link | |
715 | * @link: The link being configured | |
716 | * @flags: Link configuration flags | |
717 | * | |
718 | * The bulk of link setup is handled by the two entities connected through the | |
719 | * link. This function notifies both entities of the link configuration change. | |
720 | * | |
721 | * If the link is immutable or if the current and new configuration are | |
722 | * identical, return immediately. | |
723 | * | |
724 | * The user is expected to hold link->source->parent->mutex. If not, | |
725 | * media_entity_setup_link() should be used instead. | |
726 | */ | |
727 | int __media_entity_setup_link(struct media_link *link, u32 flags) | |
728 | { | |
7a6f0b22 | 729 | const u32 mask = MEDIA_LNK_FL_ENABLED; |
97548ed4 LP |
730 | struct media_device *mdev; |
731 | struct media_entity *source, *sink; | |
732 | int ret = -EBUSY; | |
733 | ||
734 | if (link == NULL) | |
735 | return -EINVAL; | |
736 | ||
7a6f0b22 LP |
737 | /* The non-modifiable link flags must not be modified. */ |
738 | if ((link->flags & ~mask) != (flags & ~mask)) | |
739 | return -EINVAL; | |
740 | ||
97548ed4 LP |
741 | if (link->flags & MEDIA_LNK_FL_IMMUTABLE) |
742 | return link->flags == flags ? 0 : -EINVAL; | |
743 | ||
744 | if (link->flags == flags) | |
745 | return 0; | |
746 | ||
747 | source = link->source->entity; | |
748 | sink = link->sink->entity; | |
749 | ||
e02188c9 LP |
750 | if (!(link->flags & MEDIA_LNK_FL_DYNAMIC) && |
751 | (source->stream_count || sink->stream_count)) | |
752 | return -EBUSY; | |
753 | ||
d10c9894 | 754 | mdev = source->graph_obj.mdev; |
97548ed4 | 755 | |
813f5c0a SN |
756 | if (mdev->link_notify) { |
757 | ret = mdev->link_notify(link, flags, | |
758 | MEDIA_DEV_NOTIFY_PRE_LINK_CH); | |
97548ed4 LP |
759 | if (ret < 0) |
760 | return ret; | |
761 | } | |
762 | ||
763 | ret = __media_entity_setup_link_notify(link, flags); | |
97548ed4 | 764 | |
813f5c0a SN |
765 | if (mdev->link_notify) |
766 | mdev->link_notify(link, flags, MEDIA_DEV_NOTIFY_POST_LINK_CH); | |
97548ed4 LP |
767 | |
768 | return ret; | |
769 | } | |
770 | ||
771 | int media_entity_setup_link(struct media_link *link, u32 flags) | |
772 | { | |
773 | int ret; | |
774 | ||
d10c9894 | 775 | mutex_lock(&link->source->entity->graph_obj.mdev->graph_mutex); |
97548ed4 | 776 | ret = __media_entity_setup_link(link, flags); |
d10c9894 | 777 | mutex_unlock(&link->source->entity->graph_obj.mdev->graph_mutex); |
97548ed4 LP |
778 | |
779 | return ret; | |
780 | } | |
781 | EXPORT_SYMBOL_GPL(media_entity_setup_link); | |
782 | ||
783 | /** | |
784 | * media_entity_find_link - Find a link between two pads | |
785 | * @source: Source pad | |
786 | * @sink: Sink pad | |
787 | * | |
788 | * Return a pointer to the link between the two entities. If no such link | |
789 | * exists, return NULL. | |
790 | */ | |
791 | struct media_link * | |
792 | media_entity_find_link(struct media_pad *source, struct media_pad *sink) | |
793 | { | |
794 | struct media_link *link; | |
795 | unsigned int i; | |
796 | ||
797 | for (i = 0; i < source->entity->num_links; ++i) { | |
798 | link = &source->entity->links[i]; | |
799 | ||
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 LP |
822 | { |
823 | unsigned int i; | |
824 | ||
825 | for (i = 0; i < pad->entity->num_links; i++) { | |
826 | struct media_link *link = &pad->entity->links[i]; | |
827 | ||
828 | if (!(link->flags & MEDIA_LNK_FL_ENABLED)) | |
829 | continue; | |
830 | ||
831 | if (link->source == pad) | |
832 | return link->sink; | |
833 | ||
834 | if (link->sink == pad) | |
835 | return link->source; | |
836 | } | |
837 | ||
838 | return NULL; | |
839 | ||
840 | } | |
1bddf1b3 | 841 | EXPORT_SYMBOL_GPL(media_entity_remote_pad); |
27e543fa MCC |
842 | |
843 | ||
844 | /* Functions related to the media interface via device nodes */ | |
845 | ||
846 | struct media_intf_devnode *media_devnode_create(struct media_device *mdev, | |
847 | u32 type, u32 flags, | |
848 | u32 major, u32 minor, | |
849 | gfp_t gfp_flags) | |
850 | { | |
851 | struct media_intf_devnode *devnode; | |
852 | struct media_interface *intf; | |
853 | ||
854 | devnode = kzalloc(sizeof(*devnode), gfp_flags); | |
855 | if (!devnode) | |
856 | return NULL; | |
857 | ||
858 | intf = &devnode->intf; | |
859 | ||
860 | intf->type = type; | |
861 | intf->flags = flags; | |
862 | ||
863 | devnode->major = major; | |
864 | devnode->minor = minor; | |
865 | ||
866 | media_gobj_init(mdev, MEDIA_GRAPH_INTF_DEVNODE, | |
867 | &devnode->intf.graph_obj); | |
868 | ||
869 | return devnode; | |
870 | } | |
871 | EXPORT_SYMBOL_GPL(media_devnode_create); | |
872 | ||
873 | void media_devnode_remove(struct media_intf_devnode *devnode) | |
874 | { | |
875 | media_gobj_remove(&devnode->intf.graph_obj); | |
876 | kfree(devnode); | |
877 | } | |
878 | EXPORT_SYMBOL_GPL(media_devnode_remove); |