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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, | |
3c0e266f | 97 | "%s: id 0x%08x link#%d: %s#%d ==> %s#%d\n", |
39a956c4 MCC |
98 | event_name, gobj->id, media_localid(gobj), |
99 | ||
3c0e266f MCC |
100 | gobj_type(media_type(link->gobj0)), |
101 | media_localid(link->gobj0), | |
39a956c4 | 102 | |
3c0e266f MCC |
103 | gobj_type(media_type(link->gobj1)), |
104 | media_localid(link->gobj1)); | |
39a956c4 MCC |
105 | break; |
106 | } | |
107 | case MEDIA_GRAPH_PAD: | |
108 | { | |
109 | struct media_pad *pad = gobj_to_pad(gobj); | |
110 | ||
111 | dev_dbg(gobj->mdev->dev, | |
6c24d460 MCC |
112 | "%s: id 0x%08x %s%spad#%d: '%s':%d\n", |
113 | event_name, gobj->id, | |
114 | pad->flags & MEDIA_PAD_FL_SINK ? " sink " : "", | |
115 | pad->flags & MEDIA_PAD_FL_SOURCE ? "source " : "", | |
116 | media_localid(gobj), | |
39a956c4 | 117 | pad->entity->name, pad->index); |
27e543fa MCC |
118 | break; |
119 | } | |
120 | case MEDIA_GRAPH_INTF_DEVNODE: | |
121 | { | |
122 | struct media_interface *intf = gobj_to_intf(gobj); | |
123 | struct media_intf_devnode *devnode = intf_to_devnode(intf); | |
124 | ||
125 | dev_dbg(gobj->mdev->dev, | |
126 | "%s: id 0x%08x intf_devnode#%d: %s - major: %d, minor: %d\n", | |
127 | event_name, gobj->id, media_localid(gobj), | |
128 | intf_type(intf), | |
129 | devnode->major, devnode->minor); | |
130 | break; | |
39a956c4 MCC |
131 | } |
132 | } | |
133 | #endif | |
134 | } | |
135 | ||
ec6e4c95 MCC |
136 | /** |
137 | * media_gobj_init - Initialize a graph object | |
138 | * | |
139 | * @mdev: Pointer to the media_device that contains the object | |
140 | * @type: Type of the object | |
141 | * @gobj: Pointer to the object | |
142 | * | |
143 | * This routine initializes the embedded struct media_gobj inside a | |
144 | * media graph object. It is called automatically if media_*_create() | |
145 | * calls are used. However, if the object (entity, link, pad, interface) | |
146 | * is embedded on some other object, this function should be called before | |
147 | * registering the object at the media controller. | |
148 | */ | |
149 | void media_gobj_init(struct media_device *mdev, | |
150 | enum media_gobj_type type, | |
151 | struct media_gobj *gobj) | |
152 | { | |
8f6d368f MCC |
153 | BUG_ON(!mdev); |
154 | ||
39a956c4 MCC |
155 | gobj->mdev = mdev; |
156 | ||
bfab2aac MCC |
157 | /* Create a per-type unique object ID */ |
158 | switch (type) { | |
159 | case MEDIA_GRAPH_ENTITY: | |
160 | gobj->id = media_gobj_gen_id(type, ++mdev->entity_id); | |
05bfa9fa | 161 | list_add_tail(&gobj->list, &mdev->entities); |
bfab2aac | 162 | break; |
18710dc6 MCC |
163 | case MEDIA_GRAPH_PAD: |
164 | gobj->id = media_gobj_gen_id(type, ++mdev->pad_id); | |
9155d859 | 165 | list_add_tail(&gobj->list, &mdev->pads); |
18710dc6 | 166 | break; |
6b6a4278 MCC |
167 | case MEDIA_GRAPH_LINK: |
168 | gobj->id = media_gobj_gen_id(type, ++mdev->link_id); | |
9155d859 | 169 | list_add_tail(&gobj->list, &mdev->links); |
6b6a4278 | 170 | break; |
27e543fa MCC |
171 | case MEDIA_GRAPH_INTF_DEVNODE: |
172 | gobj->id = media_gobj_gen_id(type, ++mdev->intf_devnode_id); | |
9155d859 | 173 | list_add_tail(&gobj->list, &mdev->interfaces); |
27e543fa | 174 | break; |
bfab2aac | 175 | } |
2521fdac MCC |
176 | |
177 | mdev->topology_version++; | |
178 | ||
39a956c4 | 179 | dev_dbg_obj(__func__, gobj); |
ec6e4c95 MCC |
180 | } |
181 | ||
182 | /** | |
183 | * media_gobj_remove - Stop using a graph object on a media device | |
184 | * | |
185 | * @graph_obj: Pointer to the object | |
186 | * | |
187 | * This should be called at media_device_unregister_*() routines | |
188 | */ | |
189 | void media_gobj_remove(struct media_gobj *gobj) | |
190 | { | |
39a956c4 | 191 | dev_dbg_obj(__func__, gobj); |
9155d859 | 192 | |
2521fdac MCC |
193 | gobj->mdev->topology_version++; |
194 | ||
9155d859 MCC |
195 | /* Remove the object from mdev list */ |
196 | list_del(&gobj->list); | |
ec6e4c95 MCC |
197 | } |
198 | ||
53e269c1 LP |
199 | /** |
200 | * media_entity_init - Initialize a media entity | |
201 | * | |
202 | * @num_pads: Total number of sink and source pads. | |
53e269c1 LP |
203 | * @pads: Array of 'num_pads' pads. |
204 | * | |
205 | * The total number of pads is an intrinsic property of entities known by the | |
206 | * entity driver, while the total number of links depends on hardware design | |
207 | * and is an extrinsic property unknown to the entity driver. However, in most | |
18095107 MCC |
208 | * use cases the number of links can safely be assumed to be equal to or |
209 | * larger than the number of pads. | |
53e269c1 | 210 | * |
18095107 MCC |
211 | * For those reasons the links array can be preallocated based on the number |
212 | * of pads and will be reallocated later if extra links need to be created. | |
53e269c1 LP |
213 | * |
214 | * This function allocates a links array with enough space to hold at least | |
18095107 MCC |
215 | * 'num_pads' elements. The media_entity::max_links field will be set to the |
216 | * number of allocated elements. | |
53e269c1 LP |
217 | * |
218 | * The pads array is managed by the entity driver and passed to | |
219 | * media_entity_init() where its pointer will be stored in the entity structure. | |
220 | */ | |
221 | int | |
222 | media_entity_init(struct media_entity *entity, u16 num_pads, | |
18095107 | 223 | struct media_pad *pads) |
53e269c1 | 224 | { |
53e269c1 LP |
225 | unsigned int i; |
226 | ||
53e269c1 | 227 | entity->group_id = 0; |
53e269c1 LP |
228 | entity->num_links = 0; |
229 | entity->num_backlinks = 0; | |
230 | entity->num_pads = num_pads; | |
231 | entity->pads = pads; | |
53e269c1 LP |
232 | |
233 | for (i = 0; i < num_pads; i++) { | |
234 | pads[i].entity = entity; | |
235 | pads[i].index = i; | |
236 | } | |
237 | ||
238 | return 0; | |
239 | } | |
240 | EXPORT_SYMBOL_GPL(media_entity_init); | |
241 | ||
242 | void | |
243 | media_entity_cleanup(struct media_entity *entity) | |
244 | { | |
57208e5e MCC |
245 | struct media_link *link, *tmp; |
246 | ||
247 | list_for_each_entry_safe(link, tmp, &entity->links, list) { | |
248 | media_gobj_remove(&link->graph_obj); | |
249 | list_del(&link->list); | |
250 | kfree(link); | |
251 | } | |
53e269c1 LP |
252 | } |
253 | EXPORT_SYMBOL_GPL(media_entity_cleanup); | |
254 | ||
a5ccc48a SA |
255 | /* ----------------------------------------------------------------------------- |
256 | * Graph traversal | |
257 | */ | |
258 | ||
259 | static struct media_entity * | |
260 | media_entity_other(struct media_entity *entity, struct media_link *link) | |
261 | { | |
262 | if (link->source->entity == entity) | |
263 | return link->sink->entity; | |
264 | else | |
265 | return link->source->entity; | |
266 | } | |
267 | ||
268 | /* push an entity to traversal stack */ | |
269 | static void stack_push(struct media_entity_graph *graph, | |
270 | struct media_entity *entity) | |
271 | { | |
272 | if (graph->top == MEDIA_ENTITY_ENUM_MAX_DEPTH - 1) { | |
273 | WARN_ON(1); | |
274 | return; | |
275 | } | |
276 | graph->top++; | |
57208e5e | 277 | graph->stack[graph->top].link = (&entity->links)->next; |
a5ccc48a SA |
278 | graph->stack[graph->top].entity = entity; |
279 | } | |
280 | ||
281 | static struct media_entity *stack_pop(struct media_entity_graph *graph) | |
282 | { | |
283 | struct media_entity *entity; | |
284 | ||
285 | entity = graph->stack[graph->top].entity; | |
286 | graph->top--; | |
287 | ||
288 | return entity; | |
289 | } | |
290 | ||
a5ccc48a SA |
291 | #define link_top(en) ((en)->stack[(en)->top].link) |
292 | #define stack_top(en) ((en)->stack[(en)->top].entity) | |
293 | ||
294 | /** | |
295 | * media_entity_graph_walk_start - Start walking the media graph at a given entity | |
296 | * @graph: Media graph structure that will be used to walk the graph | |
297 | * @entity: Starting entity | |
298 | * | |
299 | * This function initializes the graph traversal structure to walk the entities | |
300 | * graph starting at the given entity. The traversal structure must not be | |
301 | * modified by the caller during graph traversal. When done the structure can | |
302 | * safely be freed. | |
303 | */ | |
304 | void media_entity_graph_walk_start(struct media_entity_graph *graph, | |
305 | struct media_entity *entity) | |
306 | { | |
307 | graph->top = 0; | |
308 | graph->stack[graph->top].entity = NULL; | |
5c7b25b9 LP |
309 | bitmap_zero(graph->entities, MEDIA_ENTITY_ENUM_MAX_ID); |
310 | ||
fa762394 | 311 | if (WARN_ON(media_entity_id(entity) >= MEDIA_ENTITY_ENUM_MAX_ID)) |
5c7b25b9 LP |
312 | return; |
313 | ||
fa762394 | 314 | __set_bit(media_entity_id(entity), graph->entities); |
a5ccc48a SA |
315 | stack_push(graph, entity); |
316 | } | |
317 | EXPORT_SYMBOL_GPL(media_entity_graph_walk_start); | |
318 | ||
57208e5e | 319 | |
a5ccc48a SA |
320 | /** |
321 | * media_entity_graph_walk_next - Get the next entity in the graph | |
322 | * @graph: Media graph structure | |
323 | * | |
324 | * Perform a depth-first traversal of the given media entities graph. | |
325 | * | |
326 | * The graph structure must have been previously initialized with a call to | |
327 | * media_entity_graph_walk_start(). | |
328 | * | |
329 | * Return the next entity in the graph or NULL if the whole graph have been | |
330 | * traversed. | |
331 | */ | |
332 | struct media_entity * | |
333 | media_entity_graph_walk_next(struct media_entity_graph *graph) | |
334 | { | |
335 | if (stack_top(graph) == NULL) | |
336 | return NULL; | |
337 | ||
338 | /* | |
339 | * Depth first search. Push entity to stack and continue from | |
340 | * top of the stack until no more entities on the level can be | |
341 | * found. | |
342 | */ | |
57208e5e | 343 | while (link_top(graph) != &(stack_top(graph)->links)) { |
a5ccc48a | 344 | struct media_entity *entity = stack_top(graph); |
57208e5e | 345 | struct media_link *link; |
a5ccc48a SA |
346 | struct media_entity *next; |
347 | ||
57208e5e MCC |
348 | link = list_entry(link_top(graph), typeof(*link), list); |
349 | ||
a5ccc48a SA |
350 | /* The link is not enabled so we do not follow. */ |
351 | if (!(link->flags & MEDIA_LNK_FL_ENABLED)) { | |
57208e5e | 352 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
353 | continue; |
354 | } | |
355 | ||
356 | /* Get the entity in the other end of the link . */ | |
357 | next = media_entity_other(entity, link); | |
fa762394 | 358 | if (WARN_ON(media_entity_id(next) >= MEDIA_ENTITY_ENUM_MAX_ID)) |
5c7b25b9 | 359 | return NULL; |
a5ccc48a | 360 | |
5c7b25b9 | 361 | /* Has the entity already been visited? */ |
fa762394 | 362 | if (__test_and_set_bit(media_entity_id(next), graph->entities)) { |
57208e5e | 363 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
364 | continue; |
365 | } | |
366 | ||
367 | /* Push the new entity to stack and start over. */ | |
57208e5e | 368 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
369 | stack_push(graph, next); |
370 | } | |
371 | ||
372 | return stack_pop(graph); | |
373 | } | |
374 | EXPORT_SYMBOL_GPL(media_entity_graph_walk_next); | |
375 | ||
e02188c9 LP |
376 | /* ----------------------------------------------------------------------------- |
377 | * Pipeline management | |
378 | */ | |
379 | ||
380 | /** | |
381 | * media_entity_pipeline_start - Mark a pipeline as streaming | |
382 | * @entity: Starting entity | |
383 | * @pipe: Media pipeline to be assigned to all entities in the pipeline. | |
384 | * | |
385 | * Mark all entities connected to a given entity through enabled links, either | |
386 | * directly or indirectly, as streaming. The given pipeline object is assigned to | |
387 | * every entity in the pipeline and stored in the media_entity pipe field. | |
388 | * | |
389 | * Calls to this function can be nested, in which case the same number of | |
390 | * media_entity_pipeline_stop() calls will be required to stop streaming. The | |
391 | * pipeline pointer must be identical for all nested calls to | |
392 | * media_entity_pipeline_start(). | |
393 | */ | |
af88be38 SA |
394 | __must_check int media_entity_pipeline_start(struct media_entity *entity, |
395 | struct media_pipeline *pipe) | |
e02188c9 | 396 | { |
d10c9894 | 397 | struct media_device *mdev = entity->graph_obj.mdev; |
e02188c9 | 398 | struct media_entity_graph graph; |
af88be38 | 399 | struct media_entity *entity_err = entity; |
57208e5e | 400 | struct media_link *link; |
af88be38 | 401 | int ret; |
e02188c9 LP |
402 | |
403 | mutex_lock(&mdev->graph_mutex); | |
404 | ||
405 | media_entity_graph_walk_start(&graph, entity); | |
406 | ||
407 | while ((entity = media_entity_graph_walk_next(&graph))) { | |
ef69ee1b MCC |
408 | DECLARE_BITMAP(active, MEDIA_ENTITY_MAX_PADS); |
409 | DECLARE_BITMAP(has_no_links, MEDIA_ENTITY_MAX_PADS); | |
af88be38 | 410 | |
e02188c9 LP |
411 | entity->stream_count++; |
412 | WARN_ON(entity->pipe && entity->pipe != pipe); | |
413 | entity->pipe = pipe; | |
af88be38 SA |
414 | |
415 | /* Already streaming --- no need to check. */ | |
416 | if (entity->stream_count > 1) | |
417 | continue; | |
418 | ||
419 | if (!entity->ops || !entity->ops->link_validate) | |
420 | continue; | |
421 | ||
de49c285 SA |
422 | bitmap_zero(active, entity->num_pads); |
423 | bitmap_fill(has_no_links, entity->num_pads); | |
424 | ||
57208e5e | 425 | list_for_each_entry(link, &entity->links, list) { |
de49c285 SA |
426 | struct media_pad *pad = link->sink->entity == entity |
427 | ? link->sink : link->source; | |
428 | ||
429 | /* Mark that a pad is connected by a link. */ | |
430 | bitmap_clear(has_no_links, pad->index, 1); | |
431 | ||
432 | /* | |
433 | * Pads that either do not need to connect or | |
434 | * are connected through an enabled link are | |
435 | * fine. | |
436 | */ | |
437 | if (!(pad->flags & MEDIA_PAD_FL_MUST_CONNECT) || | |
438 | link->flags & MEDIA_LNK_FL_ENABLED) | |
439 | bitmap_set(active, pad->index, 1); | |
440 | ||
441 | /* | |
442 | * Link validation will only take place for | |
443 | * sink ends of the link that are enabled. | |
444 | */ | |
445 | if (link->sink != pad || | |
446 | !(link->flags & MEDIA_LNK_FL_ENABLED)) | |
af88be38 SA |
447 | continue; |
448 | ||
449 | ret = entity->ops->link_validate(link); | |
fab9d30b | 450 | if (ret < 0 && ret != -ENOIOCTLCMD) { |
d10c9894 | 451 | dev_dbg(entity->graph_obj.mdev->dev, |
fab9d30b | 452 | "link validation failed for \"%s\":%u -> \"%s\":%u, error %d\n", |
823ea2a6 SA |
453 | link->source->entity->name, |
454 | link->source->index, | |
455 | entity->name, link->sink->index, ret); | |
af88be38 | 456 | goto error; |
fab9d30b | 457 | } |
af88be38 | 458 | } |
de49c285 SA |
459 | |
460 | /* Either no links or validated links are fine. */ | |
461 | bitmap_or(active, active, has_no_links, entity->num_pads); | |
462 | ||
463 | if (!bitmap_full(active, entity->num_pads)) { | |
464 | ret = -EPIPE; | |
d10c9894 | 465 | dev_dbg(entity->graph_obj.mdev->dev, |
fab9d30b SA |
466 | "\"%s\":%u must be connected by an enabled link\n", |
467 | entity->name, | |
094f1ca5 SA |
468 | (unsigned)find_first_zero_bit( |
469 | active, entity->num_pads)); | |
de49c285 SA |
470 | goto error; |
471 | } | |
e02188c9 LP |
472 | } |
473 | ||
474 | mutex_unlock(&mdev->graph_mutex); | |
af88be38 SA |
475 | |
476 | return 0; | |
477 | ||
478 | error: | |
479 | /* | |
480 | * Link validation on graph failed. We revert what we did and | |
481 | * return the error. | |
482 | */ | |
483 | media_entity_graph_walk_start(&graph, entity_err); | |
484 | ||
485 | while ((entity_err = media_entity_graph_walk_next(&graph))) { | |
486 | entity_err->stream_count--; | |
487 | if (entity_err->stream_count == 0) | |
488 | entity_err->pipe = NULL; | |
489 | ||
490 | /* | |
491 | * We haven't increased stream_count further than this | |
492 | * so we quit here. | |
493 | */ | |
494 | if (entity_err == entity) | |
495 | break; | |
496 | } | |
497 | ||
498 | mutex_unlock(&mdev->graph_mutex); | |
499 | ||
500 | return ret; | |
e02188c9 LP |
501 | } |
502 | EXPORT_SYMBOL_GPL(media_entity_pipeline_start); | |
503 | ||
504 | /** | |
505 | * media_entity_pipeline_stop - Mark a pipeline as not streaming | |
506 | * @entity: Starting entity | |
507 | * | |
508 | * Mark all entities connected to a given entity through enabled links, either | |
509 | * directly or indirectly, as not streaming. The media_entity pipe field is | |
510 | * reset to NULL. | |
511 | * | |
512 | * If multiple calls to media_entity_pipeline_start() have been made, the same | |
513 | * number of calls to this function are required to mark the pipeline as not | |
514 | * streaming. | |
515 | */ | |
516 | void media_entity_pipeline_stop(struct media_entity *entity) | |
517 | { | |
d10c9894 | 518 | struct media_device *mdev = entity->graph_obj.mdev; |
e02188c9 LP |
519 | struct media_entity_graph graph; |
520 | ||
521 | mutex_lock(&mdev->graph_mutex); | |
522 | ||
523 | media_entity_graph_walk_start(&graph, entity); | |
524 | ||
525 | while ((entity = media_entity_graph_walk_next(&graph))) { | |
526 | entity->stream_count--; | |
527 | if (entity->stream_count == 0) | |
528 | entity->pipe = NULL; | |
529 | } | |
530 | ||
531 | mutex_unlock(&mdev->graph_mutex); | |
532 | } | |
533 | EXPORT_SYMBOL_GPL(media_entity_pipeline_stop); | |
534 | ||
503c3d82 LP |
535 | /* ----------------------------------------------------------------------------- |
536 | * Module use count | |
537 | */ | |
538 | ||
539 | /* | |
540 | * media_entity_get - Get a reference to the parent module | |
541 | * @entity: The entity | |
542 | * | |
543 | * Get a reference to the parent media device module. | |
544 | * | |
545 | * The function will return immediately if @entity is NULL. | |
546 | * | |
547 | * Return a pointer to the entity on success or NULL on failure. | |
548 | */ | |
549 | struct media_entity *media_entity_get(struct media_entity *entity) | |
550 | { | |
551 | if (entity == NULL) | |
552 | return NULL; | |
553 | ||
d10c9894 JMC |
554 | if (entity->graph_obj.mdev->dev && |
555 | !try_module_get(entity->graph_obj.mdev->dev->driver->owner)) | |
503c3d82 LP |
556 | return NULL; |
557 | ||
558 | return entity; | |
559 | } | |
560 | EXPORT_SYMBOL_GPL(media_entity_get); | |
561 | ||
562 | /* | |
563 | * media_entity_put - Release the reference to the parent module | |
564 | * @entity: The entity | |
565 | * | |
566 | * Release the reference count acquired by media_entity_get(). | |
567 | * | |
568 | * The function will return immediately if @entity is NULL. | |
569 | */ | |
570 | void media_entity_put(struct media_entity *entity) | |
571 | { | |
572 | if (entity == NULL) | |
573 | return; | |
574 | ||
d10c9894 JMC |
575 | if (entity->graph_obj.mdev->dev) |
576 | module_put(entity->graph_obj.mdev->dev->driver->owner); | |
503c3d82 LP |
577 | } |
578 | EXPORT_SYMBOL_GPL(media_entity_put); | |
579 | ||
a5ccc48a SA |
580 | /* ----------------------------------------------------------------------------- |
581 | * Links management | |
582 | */ | |
583 | ||
23615de5 | 584 | static struct media_link *media_add_link(struct list_head *head) |
53e269c1 | 585 | { |
57208e5e | 586 | struct media_link *link; |
53e269c1 | 587 | |
57208e5e MCC |
588 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
589 | if (link == NULL) | |
590 | return NULL; | |
53e269c1 | 591 | |
23615de5 | 592 | list_add_tail(&link->list, head); |
53e269c1 | 593 | |
57208e5e | 594 | return link; |
53e269c1 LP |
595 | } |
596 | ||
57208e5e MCC |
597 | static void __media_entity_remove_link(struct media_entity *entity, |
598 | struct media_link *link); | |
599 | ||
53e269c1 | 600 | int |
8df00a15 | 601 | media_create_pad_link(struct media_entity *source, u16 source_pad, |
53e269c1 LP |
602 | struct media_entity *sink, u16 sink_pad, u32 flags) |
603 | { | |
604 | struct media_link *link; | |
605 | struct media_link *backlink; | |
606 | ||
607 | BUG_ON(source == NULL || sink == NULL); | |
608 | BUG_ON(source_pad >= source->num_pads); | |
609 | BUG_ON(sink_pad >= sink->num_pads); | |
610 | ||
23615de5 | 611 | link = media_add_link(&source->links); |
53e269c1 LP |
612 | if (link == NULL) |
613 | return -ENOMEM; | |
614 | ||
615 | link->source = &source->pads[source_pad]; | |
616 | link->sink = &sink->pads[sink_pad]; | |
617 | link->flags = flags; | |
618 | ||
6b6a4278 | 619 | /* Initialize graph object embedded at the new link */ |
d10c9894 JMC |
620 | media_gobj_init(source->graph_obj.mdev, MEDIA_GRAPH_LINK, |
621 | &link->graph_obj); | |
6b6a4278 | 622 | |
53e269c1 LP |
623 | /* Create the backlink. Backlinks are used to help graph traversal and |
624 | * are not reported to userspace. | |
625 | */ | |
23615de5 | 626 | backlink = media_add_link(&sink->links); |
53e269c1 | 627 | if (backlink == NULL) { |
57208e5e | 628 | __media_entity_remove_link(source, link); |
53e269c1 LP |
629 | return -ENOMEM; |
630 | } | |
631 | ||
632 | backlink->source = &source->pads[source_pad]; | |
633 | backlink->sink = &sink->pads[sink_pad]; | |
634 | backlink->flags = flags; | |
635 | ||
6b6a4278 | 636 | /* Initialize graph object embedded at the new link */ |
d10c9894 JMC |
637 | media_gobj_init(sink->graph_obj.mdev, MEDIA_GRAPH_LINK, |
638 | &backlink->graph_obj); | |
6b6a4278 | 639 | |
53e269c1 LP |
640 | link->reverse = backlink; |
641 | backlink->reverse = link; | |
642 | ||
643 | sink->num_backlinks++; | |
57208e5e MCC |
644 | sink->num_links++; |
645 | source->num_links++; | |
53e269c1 LP |
646 | |
647 | return 0; | |
648 | } | |
8df00a15 | 649 | EXPORT_SYMBOL_GPL(media_create_pad_link); |
97548ed4 | 650 | |
57208e5e MCC |
651 | static void __media_entity_remove_link(struct media_entity *entity, |
652 | struct media_link *link) | |
7349cec1 | 653 | { |
57208e5e MCC |
654 | struct media_link *rlink, *tmp; |
655 | struct media_entity *remote; | |
656 | unsigned int r = 0; | |
657 | ||
658 | if (link->source->entity == entity) | |
659 | remote = link->sink->entity; | |
660 | else | |
661 | remote = link->source->entity; | |
7349cec1 | 662 | |
57208e5e MCC |
663 | list_for_each_entry_safe(rlink, tmp, &remote->links, list) { |
664 | if (rlink != link->reverse) { | |
665 | r++; | |
666 | continue; | |
667 | } | |
7349cec1 SN |
668 | |
669 | if (link->source->entity == entity) | |
57208e5e | 670 | remote->num_backlinks--; |
7349cec1 | 671 | |
57208e5e MCC |
672 | if (--remote->num_links == 0) |
673 | break; | |
7349cec1 | 674 | |
57208e5e MCC |
675 | /* Remove the remote link */ |
676 | list_del(&rlink->list); | |
677 | kfree(rlink); | |
678 | } | |
679 | list_del(&link->list); | |
680 | kfree(link); | |
681 | } | |
7349cec1 | 682 | |
57208e5e MCC |
683 | void __media_entity_remove_links(struct media_entity *entity) |
684 | { | |
685 | struct media_link *link, *tmp; | |
7349cec1 | 686 | |
57208e5e MCC |
687 | list_for_each_entry_safe(link, tmp, &entity->links, list) |
688 | __media_entity_remove_link(entity, link); | |
7349cec1 SN |
689 | |
690 | entity->num_links = 0; | |
691 | entity->num_backlinks = 0; | |
692 | } | |
693 | EXPORT_SYMBOL_GPL(__media_entity_remove_links); | |
694 | ||
695 | void media_entity_remove_links(struct media_entity *entity) | |
696 | { | |
697 | /* Do nothing if the entity is not registered. */ | |
d10c9894 | 698 | if (entity->graph_obj.mdev == NULL) |
7349cec1 SN |
699 | return; |
700 | ||
d10c9894 | 701 | mutex_lock(&entity->graph_obj.mdev->graph_mutex); |
7349cec1 | 702 | __media_entity_remove_links(entity); |
d10c9894 | 703 | mutex_unlock(&entity->graph_obj.mdev->graph_mutex); |
7349cec1 SN |
704 | } |
705 | EXPORT_SYMBOL_GPL(media_entity_remove_links); | |
706 | ||
97548ed4 LP |
707 | static int __media_entity_setup_link_notify(struct media_link *link, u32 flags) |
708 | { | |
97548ed4 LP |
709 | int ret; |
710 | ||
711 | /* Notify both entities. */ | |
712 | ret = media_entity_call(link->source->entity, link_setup, | |
713 | link->source, link->sink, flags); | |
714 | if (ret < 0 && ret != -ENOIOCTLCMD) | |
715 | return ret; | |
716 | ||
717 | ret = media_entity_call(link->sink->entity, link_setup, | |
718 | link->sink, link->source, flags); | |
719 | if (ret < 0 && ret != -ENOIOCTLCMD) { | |
720 | media_entity_call(link->source->entity, link_setup, | |
721 | link->source, link->sink, link->flags); | |
722 | return ret; | |
723 | } | |
724 | ||
7a6f0b22 | 725 | link->flags = flags; |
97548ed4 LP |
726 | link->reverse->flags = link->flags; |
727 | ||
728 | return 0; | |
729 | } | |
730 | ||
731 | /** | |
732 | * __media_entity_setup_link - Configure a media link | |
733 | * @link: The link being configured | |
734 | * @flags: Link configuration flags | |
735 | * | |
736 | * The bulk of link setup is handled by the two entities connected through the | |
737 | * link. This function notifies both entities of the link configuration change. | |
738 | * | |
739 | * If the link is immutable or if the current and new configuration are | |
740 | * identical, return immediately. | |
741 | * | |
742 | * The user is expected to hold link->source->parent->mutex. If not, | |
743 | * media_entity_setup_link() should be used instead. | |
744 | */ | |
745 | int __media_entity_setup_link(struct media_link *link, u32 flags) | |
746 | { | |
7a6f0b22 | 747 | const u32 mask = MEDIA_LNK_FL_ENABLED; |
97548ed4 LP |
748 | struct media_device *mdev; |
749 | struct media_entity *source, *sink; | |
750 | int ret = -EBUSY; | |
751 | ||
752 | if (link == NULL) | |
753 | return -EINVAL; | |
754 | ||
7a6f0b22 LP |
755 | /* The non-modifiable link flags must not be modified. */ |
756 | if ((link->flags & ~mask) != (flags & ~mask)) | |
757 | return -EINVAL; | |
758 | ||
97548ed4 LP |
759 | if (link->flags & MEDIA_LNK_FL_IMMUTABLE) |
760 | return link->flags == flags ? 0 : -EINVAL; | |
761 | ||
762 | if (link->flags == flags) | |
763 | return 0; | |
764 | ||
765 | source = link->source->entity; | |
766 | sink = link->sink->entity; | |
767 | ||
e02188c9 LP |
768 | if (!(link->flags & MEDIA_LNK_FL_DYNAMIC) && |
769 | (source->stream_count || sink->stream_count)) | |
770 | return -EBUSY; | |
771 | ||
d10c9894 | 772 | mdev = source->graph_obj.mdev; |
97548ed4 | 773 | |
813f5c0a SN |
774 | if (mdev->link_notify) { |
775 | ret = mdev->link_notify(link, flags, | |
776 | MEDIA_DEV_NOTIFY_PRE_LINK_CH); | |
97548ed4 LP |
777 | if (ret < 0) |
778 | return ret; | |
779 | } | |
780 | ||
781 | ret = __media_entity_setup_link_notify(link, flags); | |
97548ed4 | 782 | |
813f5c0a SN |
783 | if (mdev->link_notify) |
784 | mdev->link_notify(link, flags, MEDIA_DEV_NOTIFY_POST_LINK_CH); | |
97548ed4 LP |
785 | |
786 | return ret; | |
787 | } | |
788 | ||
789 | int media_entity_setup_link(struct media_link *link, u32 flags) | |
790 | { | |
791 | int ret; | |
792 | ||
d10c9894 | 793 | mutex_lock(&link->source->entity->graph_obj.mdev->graph_mutex); |
97548ed4 | 794 | ret = __media_entity_setup_link(link, flags); |
d10c9894 | 795 | mutex_unlock(&link->source->entity->graph_obj.mdev->graph_mutex); |
97548ed4 LP |
796 | |
797 | return ret; | |
798 | } | |
799 | EXPORT_SYMBOL_GPL(media_entity_setup_link); | |
800 | ||
801 | /** | |
802 | * media_entity_find_link - Find a link between two pads | |
803 | * @source: Source pad | |
804 | * @sink: Sink pad | |
805 | * | |
806 | * Return a pointer to the link between the two entities. If no such link | |
807 | * exists, return NULL. | |
808 | */ | |
809 | struct media_link * | |
810 | media_entity_find_link(struct media_pad *source, struct media_pad *sink) | |
811 | { | |
812 | struct media_link *link; | |
97548ed4 | 813 | |
57208e5e | 814 | list_for_each_entry(link, &source->entity->links, list) { |
97548ed4 LP |
815 | if (link->source->entity == source->entity && |
816 | link->source->index == source->index && | |
817 | link->sink->entity == sink->entity && | |
818 | link->sink->index == sink->index) | |
819 | return link; | |
820 | } | |
821 | ||
822 | return NULL; | |
823 | } | |
824 | EXPORT_SYMBOL_GPL(media_entity_find_link); | |
825 | ||
826 | /** | |
1bddf1b3 AH |
827 | * media_entity_remote_pad - Find the pad at the remote end of a link |
828 | * @pad: Pad at the local end of the link | |
97548ed4 | 829 | * |
1bddf1b3 AH |
830 | * Search for a remote pad connected to the given pad by iterating over all |
831 | * links originating or terminating at that pad until an enabled link is found. | |
97548ed4 LP |
832 | * |
833 | * Return a pointer to the pad at the remote end of the first found enabled | |
834 | * link, or NULL if no enabled link has been found. | |
835 | */ | |
1bddf1b3 | 836 | struct media_pad *media_entity_remote_pad(struct media_pad *pad) |
97548ed4 | 837 | { |
57208e5e | 838 | struct media_link *link; |
97548ed4 | 839 | |
57208e5e | 840 | list_for_each_entry(link, &pad->entity->links, list) { |
97548ed4 LP |
841 | if (!(link->flags & MEDIA_LNK_FL_ENABLED)) |
842 | continue; | |
843 | ||
844 | if (link->source == pad) | |
845 | return link->sink; | |
846 | ||
847 | if (link->sink == pad) | |
848 | return link->source; | |
849 | } | |
850 | ||
851 | return NULL; | |
852 | ||
853 | } | |
1bddf1b3 | 854 | EXPORT_SYMBOL_GPL(media_entity_remote_pad); |
27e543fa MCC |
855 | |
856 | ||
1283f849 MCC |
857 | static void media_interface_init(struct media_device *mdev, |
858 | struct media_interface *intf, | |
859 | u32 gobj_type, | |
860 | u32 intf_type, u32 flags) | |
861 | { | |
862 | intf->type = intf_type; | |
863 | intf->flags = flags; | |
864 | INIT_LIST_HEAD(&intf->links); | |
865 | ||
866 | media_gobj_init(mdev, gobj_type, &intf->graph_obj); | |
867 | } | |
868 | ||
27e543fa MCC |
869 | /* Functions related to the media interface via device nodes */ |
870 | ||
871 | struct media_intf_devnode *media_devnode_create(struct media_device *mdev, | |
872 | u32 type, u32 flags, | |
873 | u32 major, u32 minor, | |
874 | gfp_t gfp_flags) | |
875 | { | |
876 | struct media_intf_devnode *devnode; | |
27e543fa MCC |
877 | |
878 | devnode = kzalloc(sizeof(*devnode), gfp_flags); | |
879 | if (!devnode) | |
880 | return NULL; | |
881 | ||
27e543fa MCC |
882 | devnode->major = major; |
883 | devnode->minor = minor; | |
884 | ||
1283f849 MCC |
885 | media_interface_init(mdev, &devnode->intf, MEDIA_GRAPH_INTF_DEVNODE, |
886 | type, flags); | |
27e543fa MCC |
887 | |
888 | return devnode; | |
889 | } | |
890 | EXPORT_SYMBOL_GPL(media_devnode_create); | |
891 | ||
892 | void media_devnode_remove(struct media_intf_devnode *devnode) | |
893 | { | |
7c4696a9 | 894 | media_remove_intf_links(&devnode->intf); |
27e543fa MCC |
895 | media_gobj_remove(&devnode->intf.graph_obj); |
896 | kfree(devnode); | |
897 | } | |
898 | EXPORT_SYMBOL_GPL(media_devnode_remove); | |
86e26620 MCC |
899 | |
900 | struct media_link *media_create_intf_link(struct media_entity *entity, | |
901 | struct media_interface *intf, | |
902 | u32 flags) | |
903 | { | |
904 | struct media_link *link; | |
905 | ||
906 | link = media_add_link(&intf->links); | |
907 | if (link == NULL) | |
908 | return NULL; | |
909 | ||
910 | link->intf = intf; | |
911 | link->entity = entity; | |
912 | link->flags = flags; | |
913 | ||
914 | /* Initialize graph object embedded at the new link */ | |
915 | media_gobj_init(intf->graph_obj.mdev, MEDIA_GRAPH_LINK, | |
916 | &link->graph_obj); | |
917 | ||
918 | return link; | |
919 | } | |
920 | EXPORT_SYMBOL_GPL(media_create_intf_link); | |
921 | ||
922 | ||
923 | static void __media_remove_intf_link(struct media_link *link) | |
924 | { | |
925 | media_gobj_remove(&link->graph_obj); | |
926 | kfree(link); | |
927 | } | |
928 | ||
929 | void media_remove_intf_link(struct media_link *link) | |
930 | { | |
931 | mutex_lock(&link->graph_obj.mdev->graph_mutex); | |
932 | __media_remove_intf_link(link); | |
933 | mutex_unlock(&link->graph_obj.mdev->graph_mutex); | |
934 | } | |
935 | EXPORT_SYMBOL_GPL(media_remove_intf_link); | |
7c4696a9 MCC |
936 | |
937 | void __media_remove_intf_links(struct media_interface *intf) | |
938 | { | |
939 | struct media_link *link, *tmp; | |
940 | ||
941 | list_for_each_entry_safe(link, tmp, &intf->links, list) | |
942 | __media_remove_intf_link(link); | |
943 | ||
944 | } | |
945 | EXPORT_SYMBOL_GPL(__media_remove_intf_links); | |
946 | ||
947 | void media_remove_intf_links(struct media_interface *intf) | |
948 | { | |
949 | /* Do nothing if the intf is not registered. */ | |
950 | if (intf->graph_obj.mdev == NULL) | |
951 | return; | |
952 | ||
953 | mutex_lock(&intf->graph_obj.mdev->graph_mutex); | |
954 | __media_remove_intf_links(intf); | |
955 | mutex_unlock(&intf->graph_obj.mdev->graph_mutex); | |
956 | } | |
957 | EXPORT_SYMBOL_GPL(media_remove_intf_links); |