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Commit | Line | Data |
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53e269c1 LP |
1 | /* |
2 | * Media entity | |
3 | * | |
4 | * Copyright (C) 2010 Nokia Corporation | |
5 | * | |
6 | * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com> | |
7 | * Sakari Ailus <sakari.ailus@iki.fi> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | ||
5c7b25b9 | 23 | #include <linux/bitmap.h> |
53e269c1 LP |
24 | #include <linux/module.h> |
25 | #include <linux/slab.h> | |
26 | #include <media/media-entity.h> | |
503c3d82 | 27 | #include <media/media-device.h> |
53e269c1 | 28 | |
39a956c4 MCC |
29 | /** |
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 | { | |
8f6d368f MCC |
152 | BUG_ON(!mdev); |
153 | ||
39a956c4 MCC |
154 | gobj->mdev = mdev; |
155 | ||
bfab2aac MCC |
156 | /* Create a per-type unique object ID */ |
157 | switch (type) { | |
158 | case MEDIA_GRAPH_ENTITY: | |
159 | gobj->id = media_gobj_gen_id(type, ++mdev->entity_id); | |
160 | break; | |
18710dc6 MCC |
161 | case MEDIA_GRAPH_PAD: |
162 | gobj->id = media_gobj_gen_id(type, ++mdev->pad_id); | |
163 | break; | |
6b6a4278 MCC |
164 | case MEDIA_GRAPH_LINK: |
165 | gobj->id = media_gobj_gen_id(type, ++mdev->link_id); | |
166 | break; | |
27e543fa MCC |
167 | case MEDIA_GRAPH_INTF_DEVNODE: |
168 | gobj->id = media_gobj_gen_id(type, ++mdev->intf_devnode_id); | |
169 | break; | |
bfab2aac | 170 | } |
39a956c4 | 171 | dev_dbg_obj(__func__, gobj); |
ec6e4c95 MCC |
172 | } |
173 | ||
174 | /** | |
175 | * media_gobj_remove - Stop using a graph object on a media device | |
176 | * | |
177 | * @graph_obj: Pointer to the object | |
178 | * | |
179 | * This should be called at media_device_unregister_*() routines | |
180 | */ | |
181 | void media_gobj_remove(struct media_gobj *gobj) | |
182 | { | |
39a956c4 | 183 | dev_dbg_obj(__func__, gobj); |
ec6e4c95 MCC |
184 | } |
185 | ||
53e269c1 LP |
186 | /** |
187 | * media_entity_init - Initialize a media entity | |
188 | * | |
189 | * @num_pads: Total number of sink and source pads. | |
53e269c1 LP |
190 | * @pads: Array of 'num_pads' pads. |
191 | * | |
192 | * The total number of pads is an intrinsic property of entities known by the | |
193 | * entity driver, while the total number of links depends on hardware design | |
194 | * and is an extrinsic property unknown to the entity driver. However, in most | |
18095107 MCC |
195 | * use cases the number of links can safely be assumed to be equal to or |
196 | * larger than the number of pads. | |
53e269c1 | 197 | * |
18095107 MCC |
198 | * For those reasons the links array can be preallocated based on the number |
199 | * of pads and will be reallocated later if extra links need to be created. | |
53e269c1 LP |
200 | * |
201 | * This function allocates a links array with enough space to hold at least | |
18095107 MCC |
202 | * 'num_pads' elements. The media_entity::max_links field will be set to the |
203 | * number of allocated elements. | |
53e269c1 LP |
204 | * |
205 | * The pads array is managed by the entity driver and passed to | |
206 | * media_entity_init() where its pointer will be stored in the entity structure. | |
207 | */ | |
208 | int | |
209 | media_entity_init(struct media_entity *entity, u16 num_pads, | |
18095107 | 210 | struct media_pad *pads) |
53e269c1 | 211 | { |
53e269c1 LP |
212 | unsigned int i; |
213 | ||
53e269c1 | 214 | entity->group_id = 0; |
53e269c1 LP |
215 | entity->num_links = 0; |
216 | entity->num_backlinks = 0; | |
217 | entity->num_pads = num_pads; | |
218 | entity->pads = pads; | |
53e269c1 LP |
219 | |
220 | for (i = 0; i < num_pads; i++) { | |
221 | pads[i].entity = entity; | |
222 | pads[i].index = i; | |
223 | } | |
224 | ||
225 | return 0; | |
226 | } | |
227 | EXPORT_SYMBOL_GPL(media_entity_init); | |
228 | ||
229 | void | |
230 | media_entity_cleanup(struct media_entity *entity) | |
231 | { | |
57208e5e MCC |
232 | struct media_link *link, *tmp; |
233 | ||
234 | list_for_each_entry_safe(link, tmp, &entity->links, list) { | |
235 | media_gobj_remove(&link->graph_obj); | |
236 | list_del(&link->list); | |
237 | kfree(link); | |
238 | } | |
53e269c1 LP |
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++; | |
57208e5e | 264 | graph->stack[graph->top].link = (&entity->links)->next; |
a5ccc48a SA |
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 | ||
57208e5e | 306 | |
a5ccc48a SA |
307 | /** |
308 | * media_entity_graph_walk_next - Get the next entity in the graph | |
309 | * @graph: Media graph structure | |
310 | * | |
311 | * Perform a depth-first traversal of the given media entities graph. | |
312 | * | |
313 | * The graph structure must have been previously initialized with a call to | |
314 | * media_entity_graph_walk_start(). | |
315 | * | |
316 | * Return the next entity in the graph or NULL if the whole graph have been | |
317 | * traversed. | |
318 | */ | |
319 | struct media_entity * | |
320 | media_entity_graph_walk_next(struct media_entity_graph *graph) | |
321 | { | |
322 | if (stack_top(graph) == NULL) | |
323 | return NULL; | |
324 | ||
325 | /* | |
326 | * Depth first search. Push entity to stack and continue from | |
327 | * top of the stack until no more entities on the level can be | |
328 | * found. | |
329 | */ | |
57208e5e | 330 | while (link_top(graph) != &(stack_top(graph)->links)) { |
a5ccc48a | 331 | struct media_entity *entity = stack_top(graph); |
57208e5e | 332 | struct media_link *link; |
a5ccc48a SA |
333 | struct media_entity *next; |
334 | ||
57208e5e MCC |
335 | link = list_entry(link_top(graph), typeof(*link), list); |
336 | ||
a5ccc48a SA |
337 | /* The link is not enabled so we do not follow. */ |
338 | if (!(link->flags & MEDIA_LNK_FL_ENABLED)) { | |
57208e5e | 339 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
340 | continue; |
341 | } | |
342 | ||
343 | /* Get the entity in the other end of the link . */ | |
344 | next = media_entity_other(entity, link); | |
fa762394 | 345 | if (WARN_ON(media_entity_id(next) >= MEDIA_ENTITY_ENUM_MAX_ID)) |
5c7b25b9 | 346 | return NULL; |
a5ccc48a | 347 | |
5c7b25b9 | 348 | /* Has the entity already been visited? */ |
fa762394 | 349 | if (__test_and_set_bit(media_entity_id(next), graph->entities)) { |
57208e5e | 350 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
351 | continue; |
352 | } | |
353 | ||
354 | /* Push the new entity to stack and start over. */ | |
57208e5e | 355 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
356 | stack_push(graph, next); |
357 | } | |
358 | ||
359 | return stack_pop(graph); | |
360 | } | |
361 | EXPORT_SYMBOL_GPL(media_entity_graph_walk_next); | |
362 | ||
e02188c9 LP |
363 | /* ----------------------------------------------------------------------------- |
364 | * Pipeline management | |
365 | */ | |
366 | ||
367 | /** | |
368 | * media_entity_pipeline_start - Mark a pipeline as streaming | |
369 | * @entity: Starting entity | |
370 | * @pipe: Media pipeline to be assigned to all entities in the pipeline. | |
371 | * | |
372 | * Mark all entities connected to a given entity through enabled links, either | |
373 | * directly or indirectly, as streaming. The given pipeline object is assigned to | |
374 | * every entity in the pipeline and stored in the media_entity pipe field. | |
375 | * | |
376 | * Calls to this function can be nested, in which case the same number of | |
377 | * media_entity_pipeline_stop() calls will be required to stop streaming. The | |
378 | * pipeline pointer must be identical for all nested calls to | |
379 | * media_entity_pipeline_start(). | |
380 | */ | |
af88be38 SA |
381 | __must_check int media_entity_pipeline_start(struct media_entity *entity, |
382 | struct media_pipeline *pipe) | |
e02188c9 | 383 | { |
d10c9894 | 384 | struct media_device *mdev = entity->graph_obj.mdev; |
e02188c9 | 385 | struct media_entity_graph graph; |
af88be38 | 386 | struct media_entity *entity_err = entity; |
57208e5e | 387 | struct media_link *link; |
af88be38 | 388 | int ret; |
e02188c9 LP |
389 | |
390 | mutex_lock(&mdev->graph_mutex); | |
391 | ||
392 | media_entity_graph_walk_start(&graph, entity); | |
393 | ||
394 | while ((entity = media_entity_graph_walk_next(&graph))) { | |
ef69ee1b MCC |
395 | DECLARE_BITMAP(active, MEDIA_ENTITY_MAX_PADS); |
396 | DECLARE_BITMAP(has_no_links, MEDIA_ENTITY_MAX_PADS); | |
af88be38 | 397 | |
e02188c9 LP |
398 | entity->stream_count++; |
399 | WARN_ON(entity->pipe && entity->pipe != pipe); | |
400 | entity->pipe = pipe; | |
af88be38 SA |
401 | |
402 | /* Already streaming --- no need to check. */ | |
403 | if (entity->stream_count > 1) | |
404 | continue; | |
405 | ||
406 | if (!entity->ops || !entity->ops->link_validate) | |
407 | continue; | |
408 | ||
de49c285 SA |
409 | bitmap_zero(active, entity->num_pads); |
410 | bitmap_fill(has_no_links, entity->num_pads); | |
411 | ||
57208e5e | 412 | list_for_each_entry(link, &entity->links, list) { |
de49c285 SA |
413 | struct media_pad *pad = link->sink->entity == entity |
414 | ? link->sink : link->source; | |
415 | ||
416 | /* Mark that a pad is connected by a link. */ | |
417 | bitmap_clear(has_no_links, pad->index, 1); | |
418 | ||
419 | /* | |
420 | * Pads that either do not need to connect or | |
421 | * are connected through an enabled link are | |
422 | * fine. | |
423 | */ | |
424 | if (!(pad->flags & MEDIA_PAD_FL_MUST_CONNECT) || | |
425 | link->flags & MEDIA_LNK_FL_ENABLED) | |
426 | bitmap_set(active, pad->index, 1); | |
427 | ||
428 | /* | |
429 | * Link validation will only take place for | |
430 | * sink ends of the link that are enabled. | |
431 | */ | |
432 | if (link->sink != pad || | |
433 | !(link->flags & MEDIA_LNK_FL_ENABLED)) | |
af88be38 SA |
434 | continue; |
435 | ||
436 | ret = entity->ops->link_validate(link); | |
fab9d30b | 437 | if (ret < 0 && ret != -ENOIOCTLCMD) { |
d10c9894 | 438 | dev_dbg(entity->graph_obj.mdev->dev, |
fab9d30b | 439 | "link validation failed for \"%s\":%u -> \"%s\":%u, error %d\n", |
823ea2a6 SA |
440 | link->source->entity->name, |
441 | link->source->index, | |
442 | entity->name, link->sink->index, ret); | |
af88be38 | 443 | goto error; |
fab9d30b | 444 | } |
af88be38 | 445 | } |
de49c285 SA |
446 | |
447 | /* Either no links or validated links are fine. */ | |
448 | bitmap_or(active, active, has_no_links, entity->num_pads); | |
449 | ||
450 | if (!bitmap_full(active, entity->num_pads)) { | |
451 | ret = -EPIPE; | |
d10c9894 | 452 | dev_dbg(entity->graph_obj.mdev->dev, |
fab9d30b SA |
453 | "\"%s\":%u must be connected by an enabled link\n", |
454 | entity->name, | |
094f1ca5 SA |
455 | (unsigned)find_first_zero_bit( |
456 | active, entity->num_pads)); | |
de49c285 SA |
457 | goto error; |
458 | } | |
e02188c9 LP |
459 | } |
460 | ||
461 | mutex_unlock(&mdev->graph_mutex); | |
af88be38 SA |
462 | |
463 | return 0; | |
464 | ||
465 | error: | |
466 | /* | |
467 | * Link validation on graph failed. We revert what we did and | |
468 | * return the error. | |
469 | */ | |
470 | media_entity_graph_walk_start(&graph, entity_err); | |
471 | ||
472 | while ((entity_err = media_entity_graph_walk_next(&graph))) { | |
473 | entity_err->stream_count--; | |
474 | if (entity_err->stream_count == 0) | |
475 | entity_err->pipe = NULL; | |
476 | ||
477 | /* | |
478 | * We haven't increased stream_count further than this | |
479 | * so we quit here. | |
480 | */ | |
481 | if (entity_err == entity) | |
482 | break; | |
483 | } | |
484 | ||
485 | mutex_unlock(&mdev->graph_mutex); | |
486 | ||
487 | return ret; | |
e02188c9 LP |
488 | } |
489 | EXPORT_SYMBOL_GPL(media_entity_pipeline_start); | |
490 | ||
491 | /** | |
492 | * media_entity_pipeline_stop - Mark a pipeline as not streaming | |
493 | * @entity: Starting entity | |
494 | * | |
495 | * Mark all entities connected to a given entity through enabled links, either | |
496 | * directly or indirectly, as not streaming. The media_entity pipe field is | |
497 | * reset to NULL. | |
498 | * | |
499 | * If multiple calls to media_entity_pipeline_start() have been made, the same | |
500 | * number of calls to this function are required to mark the pipeline as not | |
501 | * streaming. | |
502 | */ | |
503 | void media_entity_pipeline_stop(struct media_entity *entity) | |
504 | { | |
d10c9894 | 505 | struct media_device *mdev = entity->graph_obj.mdev; |
e02188c9 LP |
506 | struct media_entity_graph graph; |
507 | ||
508 | mutex_lock(&mdev->graph_mutex); | |
509 | ||
510 | media_entity_graph_walk_start(&graph, entity); | |
511 | ||
512 | while ((entity = media_entity_graph_walk_next(&graph))) { | |
513 | entity->stream_count--; | |
514 | if (entity->stream_count == 0) | |
515 | entity->pipe = NULL; | |
516 | } | |
517 | ||
518 | mutex_unlock(&mdev->graph_mutex); | |
519 | } | |
520 | EXPORT_SYMBOL_GPL(media_entity_pipeline_stop); | |
521 | ||
503c3d82 LP |
522 | /* ----------------------------------------------------------------------------- |
523 | * Module use count | |
524 | */ | |
525 | ||
526 | /* | |
527 | * media_entity_get - Get a reference to the parent module | |
528 | * @entity: The entity | |
529 | * | |
530 | * Get a reference to the parent media device module. | |
531 | * | |
532 | * The function will return immediately if @entity is NULL. | |
533 | * | |
534 | * Return a pointer to the entity on success or NULL on failure. | |
535 | */ | |
536 | struct media_entity *media_entity_get(struct media_entity *entity) | |
537 | { | |
538 | if (entity == NULL) | |
539 | return NULL; | |
540 | ||
d10c9894 JMC |
541 | if (entity->graph_obj.mdev->dev && |
542 | !try_module_get(entity->graph_obj.mdev->dev->driver->owner)) | |
503c3d82 LP |
543 | return NULL; |
544 | ||
545 | return entity; | |
546 | } | |
547 | EXPORT_SYMBOL_GPL(media_entity_get); | |
548 | ||
549 | /* | |
550 | * media_entity_put - Release the reference to the parent module | |
551 | * @entity: The entity | |
552 | * | |
553 | * Release the reference count acquired by media_entity_get(). | |
554 | * | |
555 | * The function will return immediately if @entity is NULL. | |
556 | */ | |
557 | void media_entity_put(struct media_entity *entity) | |
558 | { | |
559 | if (entity == NULL) | |
560 | return; | |
561 | ||
d10c9894 JMC |
562 | if (entity->graph_obj.mdev->dev) |
563 | module_put(entity->graph_obj.mdev->dev->driver->owner); | |
503c3d82 LP |
564 | } |
565 | EXPORT_SYMBOL_GPL(media_entity_put); | |
566 | ||
a5ccc48a SA |
567 | /* ----------------------------------------------------------------------------- |
568 | * Links management | |
569 | */ | |
570 | ||
53e269c1 LP |
571 | static struct media_link *media_entity_add_link(struct media_entity *entity) |
572 | { | |
57208e5e | 573 | struct media_link *link; |
53e269c1 | 574 | |
57208e5e MCC |
575 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
576 | if (link == NULL) | |
577 | return NULL; | |
53e269c1 | 578 | |
57208e5e | 579 | list_add_tail(&link->list, &entity->links); |
53e269c1 | 580 | |
57208e5e | 581 | return link; |
53e269c1 LP |
582 | } |
583 | ||
57208e5e MCC |
584 | static void __media_entity_remove_link(struct media_entity *entity, |
585 | struct media_link *link); | |
586 | ||
53e269c1 | 587 | int |
8df00a15 | 588 | media_create_pad_link(struct media_entity *source, u16 source_pad, |
53e269c1 LP |
589 | struct media_entity *sink, u16 sink_pad, u32 flags) |
590 | { | |
591 | struct media_link *link; | |
592 | struct media_link *backlink; | |
593 | ||
594 | BUG_ON(source == NULL || sink == NULL); | |
595 | BUG_ON(source_pad >= source->num_pads); | |
596 | BUG_ON(sink_pad >= sink->num_pads); | |
597 | ||
598 | link = media_entity_add_link(source); | |
599 | if (link == NULL) | |
600 | return -ENOMEM; | |
601 | ||
602 | link->source = &source->pads[source_pad]; | |
603 | link->sink = &sink->pads[sink_pad]; | |
604 | link->flags = flags; | |
605 | ||
6b6a4278 | 606 | /* Initialize graph object embedded at the new link */ |
d10c9894 JMC |
607 | media_gobj_init(source->graph_obj.mdev, MEDIA_GRAPH_LINK, |
608 | &link->graph_obj); | |
6b6a4278 | 609 | |
53e269c1 LP |
610 | /* Create the backlink. Backlinks are used to help graph traversal and |
611 | * are not reported to userspace. | |
612 | */ | |
613 | backlink = media_entity_add_link(sink); | |
614 | if (backlink == NULL) { | |
57208e5e | 615 | __media_entity_remove_link(source, link); |
53e269c1 LP |
616 | return -ENOMEM; |
617 | } | |
618 | ||
619 | backlink->source = &source->pads[source_pad]; | |
620 | backlink->sink = &sink->pads[sink_pad]; | |
621 | backlink->flags = flags; | |
622 | ||
6b6a4278 | 623 | /* Initialize graph object embedded at the new link */ |
d10c9894 JMC |
624 | media_gobj_init(sink->graph_obj.mdev, MEDIA_GRAPH_LINK, |
625 | &backlink->graph_obj); | |
6b6a4278 | 626 | |
53e269c1 LP |
627 | link->reverse = backlink; |
628 | backlink->reverse = link; | |
629 | ||
630 | sink->num_backlinks++; | |
57208e5e MCC |
631 | sink->num_links++; |
632 | source->num_links++; | |
53e269c1 LP |
633 | |
634 | return 0; | |
635 | } | |
8df00a15 | 636 | EXPORT_SYMBOL_GPL(media_create_pad_link); |
97548ed4 | 637 | |
57208e5e MCC |
638 | static void __media_entity_remove_link(struct media_entity *entity, |
639 | struct media_link *link) | |
7349cec1 | 640 | { |
57208e5e MCC |
641 | struct media_link *rlink, *tmp; |
642 | struct media_entity *remote; | |
643 | unsigned int r = 0; | |
644 | ||
645 | if (link->source->entity == entity) | |
646 | remote = link->sink->entity; | |
647 | else | |
648 | remote = link->source->entity; | |
7349cec1 | 649 | |
57208e5e MCC |
650 | list_for_each_entry_safe(rlink, tmp, &remote->links, list) { |
651 | if (rlink != link->reverse) { | |
652 | r++; | |
653 | continue; | |
654 | } | |
7349cec1 SN |
655 | |
656 | if (link->source->entity == entity) | |
57208e5e | 657 | remote->num_backlinks--; |
7349cec1 | 658 | |
57208e5e MCC |
659 | if (--remote->num_links == 0) |
660 | break; | |
7349cec1 | 661 | |
57208e5e MCC |
662 | /* Remove the remote link */ |
663 | list_del(&rlink->list); | |
664 | kfree(rlink); | |
665 | } | |
666 | list_del(&link->list); | |
667 | kfree(link); | |
668 | } | |
7349cec1 | 669 | |
57208e5e MCC |
670 | void __media_entity_remove_links(struct media_entity *entity) |
671 | { | |
672 | struct media_link *link, *tmp; | |
7349cec1 | 673 | |
57208e5e MCC |
674 | list_for_each_entry_safe(link, tmp, &entity->links, list) |
675 | __media_entity_remove_link(entity, link); | |
7349cec1 SN |
676 | |
677 | entity->num_links = 0; | |
678 | entity->num_backlinks = 0; | |
679 | } | |
680 | EXPORT_SYMBOL_GPL(__media_entity_remove_links); | |
681 | ||
682 | void media_entity_remove_links(struct media_entity *entity) | |
683 | { | |
684 | /* Do nothing if the entity is not registered. */ | |
d10c9894 | 685 | if (entity->graph_obj.mdev == NULL) |
7349cec1 SN |
686 | return; |
687 | ||
d10c9894 | 688 | mutex_lock(&entity->graph_obj.mdev->graph_mutex); |
7349cec1 | 689 | __media_entity_remove_links(entity); |
d10c9894 | 690 | mutex_unlock(&entity->graph_obj.mdev->graph_mutex); |
7349cec1 SN |
691 | } |
692 | EXPORT_SYMBOL_GPL(media_entity_remove_links); | |
693 | ||
97548ed4 LP |
694 | static int __media_entity_setup_link_notify(struct media_link *link, u32 flags) |
695 | { | |
97548ed4 LP |
696 | int ret; |
697 | ||
698 | /* Notify both entities. */ | |
699 | ret = media_entity_call(link->source->entity, link_setup, | |
700 | link->source, link->sink, flags); | |
701 | if (ret < 0 && ret != -ENOIOCTLCMD) | |
702 | return ret; | |
703 | ||
704 | ret = media_entity_call(link->sink->entity, link_setup, | |
705 | link->sink, link->source, flags); | |
706 | if (ret < 0 && ret != -ENOIOCTLCMD) { | |
707 | media_entity_call(link->source->entity, link_setup, | |
708 | link->source, link->sink, link->flags); | |
709 | return ret; | |
710 | } | |
711 | ||
7a6f0b22 | 712 | link->flags = flags; |
97548ed4 LP |
713 | link->reverse->flags = link->flags; |
714 | ||
715 | return 0; | |
716 | } | |
717 | ||
718 | /** | |
719 | * __media_entity_setup_link - Configure a media link | |
720 | * @link: The link being configured | |
721 | * @flags: Link configuration flags | |
722 | * | |
723 | * The bulk of link setup is handled by the two entities connected through the | |
724 | * link. This function notifies both entities of the link configuration change. | |
725 | * | |
726 | * If the link is immutable or if the current and new configuration are | |
727 | * identical, return immediately. | |
728 | * | |
729 | * The user is expected to hold link->source->parent->mutex. If not, | |
730 | * media_entity_setup_link() should be used instead. | |
731 | */ | |
732 | int __media_entity_setup_link(struct media_link *link, u32 flags) | |
733 | { | |
7a6f0b22 | 734 | const u32 mask = MEDIA_LNK_FL_ENABLED; |
97548ed4 LP |
735 | struct media_device *mdev; |
736 | struct media_entity *source, *sink; | |
737 | int ret = -EBUSY; | |
738 | ||
739 | if (link == NULL) | |
740 | return -EINVAL; | |
741 | ||
7a6f0b22 LP |
742 | /* The non-modifiable link flags must not be modified. */ |
743 | if ((link->flags & ~mask) != (flags & ~mask)) | |
744 | return -EINVAL; | |
745 | ||
97548ed4 LP |
746 | if (link->flags & MEDIA_LNK_FL_IMMUTABLE) |
747 | return link->flags == flags ? 0 : -EINVAL; | |
748 | ||
749 | if (link->flags == flags) | |
750 | return 0; | |
751 | ||
752 | source = link->source->entity; | |
753 | sink = link->sink->entity; | |
754 | ||
e02188c9 LP |
755 | if (!(link->flags & MEDIA_LNK_FL_DYNAMIC) && |
756 | (source->stream_count || sink->stream_count)) | |
757 | return -EBUSY; | |
758 | ||
d10c9894 | 759 | mdev = source->graph_obj.mdev; |
97548ed4 | 760 | |
813f5c0a SN |
761 | if (mdev->link_notify) { |
762 | ret = mdev->link_notify(link, flags, | |
763 | MEDIA_DEV_NOTIFY_PRE_LINK_CH); | |
97548ed4 LP |
764 | if (ret < 0) |
765 | return ret; | |
766 | } | |
767 | ||
768 | ret = __media_entity_setup_link_notify(link, flags); | |
97548ed4 | 769 | |
813f5c0a SN |
770 | if (mdev->link_notify) |
771 | mdev->link_notify(link, flags, MEDIA_DEV_NOTIFY_POST_LINK_CH); | |
97548ed4 LP |
772 | |
773 | return ret; | |
774 | } | |
775 | ||
776 | int media_entity_setup_link(struct media_link *link, u32 flags) | |
777 | { | |
778 | int ret; | |
779 | ||
d10c9894 | 780 | mutex_lock(&link->source->entity->graph_obj.mdev->graph_mutex); |
97548ed4 | 781 | ret = __media_entity_setup_link(link, flags); |
d10c9894 | 782 | mutex_unlock(&link->source->entity->graph_obj.mdev->graph_mutex); |
97548ed4 LP |
783 | |
784 | return ret; | |
785 | } | |
786 | EXPORT_SYMBOL_GPL(media_entity_setup_link); | |
787 | ||
788 | /** | |
789 | * media_entity_find_link - Find a link between two pads | |
790 | * @source: Source pad | |
791 | * @sink: Sink pad | |
792 | * | |
793 | * Return a pointer to the link between the two entities. If no such link | |
794 | * exists, return NULL. | |
795 | */ | |
796 | struct media_link * | |
797 | media_entity_find_link(struct media_pad *source, struct media_pad *sink) | |
798 | { | |
799 | struct media_link *link; | |
97548ed4 | 800 | |
57208e5e | 801 | list_for_each_entry(link, &source->entity->links, list) { |
97548ed4 LP |
802 | if (link->source->entity == source->entity && |
803 | link->source->index == source->index && | |
804 | link->sink->entity == sink->entity && | |
805 | link->sink->index == sink->index) | |
806 | return link; | |
807 | } | |
808 | ||
809 | return NULL; | |
810 | } | |
811 | EXPORT_SYMBOL_GPL(media_entity_find_link); | |
812 | ||
813 | /** | |
1bddf1b3 AH |
814 | * media_entity_remote_pad - Find the pad at the remote end of a link |
815 | * @pad: Pad at the local end of the link | |
97548ed4 | 816 | * |
1bddf1b3 AH |
817 | * Search for a remote pad connected to the given pad by iterating over all |
818 | * links originating or terminating at that pad until an enabled link is found. | |
97548ed4 LP |
819 | * |
820 | * Return a pointer to the pad at the remote end of the first found enabled | |
821 | * link, or NULL if no enabled link has been found. | |
822 | */ | |
1bddf1b3 | 823 | struct media_pad *media_entity_remote_pad(struct media_pad *pad) |
97548ed4 | 824 | { |
57208e5e | 825 | struct media_link *link; |
97548ed4 | 826 | |
57208e5e | 827 | list_for_each_entry(link, &pad->entity->links, list) { |
97548ed4 LP |
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); |