Commit | Line | Data |
---|---|---|
53e269c1 LP |
1 | /* |
2 | * Media entity | |
3 | * | |
4 | * Copyright (C) 2010 Nokia Corporation | |
5 | * | |
6 | * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com> | |
7 | * Sakari Ailus <sakari.ailus@iki.fi> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | ||
5c7b25b9 | 23 | #include <linux/bitmap.h> |
53e269c1 LP |
24 | #include <linux/module.h> |
25 | #include <linux/slab.h> | |
26 | #include <media/media-entity.h> | |
503c3d82 | 27 | #include <media/media-device.h> |
53e269c1 | 28 | |
39a956c4 MCC |
29 | static inline const char *gobj_type(enum media_gobj_type type) |
30 | { | |
31 | switch (type) { | |
32 | case MEDIA_GRAPH_ENTITY: | |
33 | return "entity"; | |
34 | case MEDIA_GRAPH_PAD: | |
35 | return "pad"; | |
36 | case MEDIA_GRAPH_LINK: | |
37 | return "link"; | |
27e543fa MCC |
38 | case MEDIA_GRAPH_INTF_DEVNODE: |
39 | return "intf-devnode"; | |
39a956c4 MCC |
40 | default: |
41 | return "unknown"; | |
42 | } | |
43 | } | |
44 | ||
27e543fa MCC |
45 | static inline const char *intf_type(struct media_interface *intf) |
46 | { | |
47 | switch (intf->type) { | |
48 | case MEDIA_INTF_T_DVB_FE: | |
66c1db1b | 49 | return "dvb-frontend"; |
27e543fa | 50 | case MEDIA_INTF_T_DVB_DEMUX: |
66c1db1b | 51 | return "dvb-demux"; |
27e543fa | 52 | case MEDIA_INTF_T_DVB_DVR: |
66c1db1b | 53 | return "dvb-dvr"; |
27e543fa | 54 | case MEDIA_INTF_T_DVB_CA: |
66c1db1b | 55 | return "dvb-ca"; |
27e543fa | 56 | case MEDIA_INTF_T_DVB_NET: |
66c1db1b | 57 | return "dvb-net"; |
27e543fa | 58 | case MEDIA_INTF_T_V4L_VIDEO: |
66c1db1b | 59 | return "v4l-video"; |
27e543fa | 60 | case MEDIA_INTF_T_V4L_VBI: |
66c1db1b | 61 | return "v4l-vbi"; |
27e543fa | 62 | case MEDIA_INTF_T_V4L_RADIO: |
66c1db1b | 63 | return "v4l-radio"; |
27e543fa | 64 | case MEDIA_INTF_T_V4L_SUBDEV: |
66c1db1b | 65 | return "v4l-subdev"; |
27e543fa | 66 | case MEDIA_INTF_T_V4L_SWRADIO: |
66c1db1b | 67 | return "v4l-swradio"; |
5af557a6 | 68 | case MEDIA_INTF_T_ALSA_PCM_CAPTURE: |
66c1db1b | 69 | return "alsa-pcm-capture"; |
5af557a6 | 70 | case MEDIA_INTF_T_ALSA_PCM_PLAYBACK: |
66c1db1b | 71 | return "alsa-pcm-playback"; |
5af557a6 SK |
72 | case MEDIA_INTF_T_ALSA_CONTROL: |
73 | return "alsa-control"; | |
74 | case MEDIA_INTF_T_ALSA_COMPRESS: | |
66c1db1b | 75 | return "alsa-compress"; |
5af557a6 | 76 | case MEDIA_INTF_T_ALSA_RAWMIDI: |
66c1db1b | 77 | return "alsa-rawmidi"; |
5af557a6 | 78 | case MEDIA_INTF_T_ALSA_HWDEP: |
66c1db1b | 79 | return "alsa-hwdep"; |
5af557a6 | 80 | case MEDIA_INTF_T_ALSA_SEQUENCER: |
66c1db1b | 81 | return "alsa-sequencer"; |
5af557a6 | 82 | case MEDIA_INTF_T_ALSA_TIMER: |
66c1db1b | 83 | return "alsa-timer"; |
27e543fa MCC |
84 | default: |
85 | return "unknown-intf"; | |
86 | } | |
87 | }; | |
88 | ||
c8d54cd5 SA |
89 | __must_check int __media_entity_enum_init(struct media_entity_enum *ent_enum, |
90 | int idx_max) | |
91 | { | |
f7b5dff0 SA |
92 | idx_max = ALIGN(idx_max, BITS_PER_LONG); |
93 | ent_enum->bmap = kcalloc(idx_max / BITS_PER_LONG, sizeof(long), | |
94 | GFP_KERNEL); | |
030e89ec SA |
95 | if (!ent_enum->bmap) |
96 | return -ENOMEM; | |
c8d54cd5 SA |
97 | |
98 | bitmap_zero(ent_enum->bmap, idx_max); | |
99 | ent_enum->idx_max = idx_max; | |
100 | ||
101 | return 0; | |
102 | } | |
103 | EXPORT_SYMBOL_GPL(__media_entity_enum_init); | |
104 | ||
c8d54cd5 SA |
105 | void media_entity_enum_cleanup(struct media_entity_enum *ent_enum) |
106 | { | |
030e89ec | 107 | kfree(ent_enum->bmap); |
c8d54cd5 SA |
108 | } |
109 | EXPORT_SYMBOL_GPL(media_entity_enum_cleanup); | |
110 | ||
1fc25d30 MCC |
111 | /** |
112 | * dev_dbg_obj - Prints in debug mode a change on some object | |
113 | * | |
114 | * @event_name: Name of the event to report. Could be __func__ | |
115 | * @gobj: Pointer to the object | |
116 | * | |
117 | * Enabled only if DEBUG or CONFIG_DYNAMIC_DEBUG. Otherwise, it | |
118 | * won't produce any code. | |
119 | */ | |
39a956c4 MCC |
120 | static void dev_dbg_obj(const char *event_name, struct media_gobj *gobj) |
121 | { | |
122 | #if defined(DEBUG) || defined (CONFIG_DYNAMIC_DEBUG) | |
123 | switch (media_type(gobj)) { | |
124 | case MEDIA_GRAPH_ENTITY: | |
125 | dev_dbg(gobj->mdev->dev, | |
05b3b77c MCC |
126 | "%s id %u: entity '%s'\n", |
127 | event_name, media_id(gobj), | |
39a956c4 MCC |
128 | gobj_to_entity(gobj)->name); |
129 | break; | |
130 | case MEDIA_GRAPH_LINK: | |
131 | { | |
132 | struct media_link *link = gobj_to_link(gobj); | |
133 | ||
134 | dev_dbg(gobj->mdev->dev, | |
05b3b77c MCC |
135 | "%s id %u: %s link id %u ==> id %u\n", |
136 | event_name, media_id(gobj), | |
137 | media_type(link->gobj0) == MEDIA_GRAPH_PAD ? | |
138 | "data" : "interface", | |
139 | media_id(link->gobj0), | |
140 | media_id(link->gobj1)); | |
39a956c4 MCC |
141 | break; |
142 | } | |
143 | case MEDIA_GRAPH_PAD: | |
144 | { | |
145 | struct media_pad *pad = gobj_to_pad(gobj); | |
146 | ||
147 | dev_dbg(gobj->mdev->dev, | |
05b3b77c MCC |
148 | "%s id %u: %s%spad '%s':%d\n", |
149 | event_name, media_id(gobj), | |
150 | pad->flags & MEDIA_PAD_FL_SINK ? "sink " : "", | |
6c24d460 | 151 | pad->flags & MEDIA_PAD_FL_SOURCE ? "source " : "", |
39a956c4 | 152 | pad->entity->name, pad->index); |
27e543fa MCC |
153 | break; |
154 | } | |
155 | case MEDIA_GRAPH_INTF_DEVNODE: | |
156 | { | |
157 | struct media_interface *intf = gobj_to_intf(gobj); | |
158 | struct media_intf_devnode *devnode = intf_to_devnode(intf); | |
159 | ||
160 | dev_dbg(gobj->mdev->dev, | |
05b3b77c MCC |
161 | "%s id %u: intf_devnode %s - major: %d, minor: %d\n", |
162 | event_name, media_id(gobj), | |
27e543fa MCC |
163 | intf_type(intf), |
164 | devnode->major, devnode->minor); | |
165 | break; | |
39a956c4 MCC |
166 | } |
167 | } | |
168 | #endif | |
169 | } | |
170 | ||
c350ef83 | 171 | void media_gobj_create(struct media_device *mdev, |
ec6e4c95 MCC |
172 | enum media_gobj_type type, |
173 | struct media_gobj *gobj) | |
174 | { | |
8f6d368f MCC |
175 | BUG_ON(!mdev); |
176 | ||
39a956c4 MCC |
177 | gobj->mdev = mdev; |
178 | ||
bfab2aac | 179 | /* Create a per-type unique object ID */ |
05b3b77c MCC |
180 | gobj->id = media_gobj_gen_id(type, ++mdev->id); |
181 | ||
bfab2aac MCC |
182 | switch (type) { |
183 | case MEDIA_GRAPH_ENTITY: | |
05bfa9fa | 184 | list_add_tail(&gobj->list, &mdev->entities); |
bfab2aac | 185 | break; |
18710dc6 | 186 | case MEDIA_GRAPH_PAD: |
9155d859 | 187 | list_add_tail(&gobj->list, &mdev->pads); |
18710dc6 | 188 | break; |
6b6a4278 | 189 | case MEDIA_GRAPH_LINK: |
9155d859 | 190 | list_add_tail(&gobj->list, &mdev->links); |
6b6a4278 | 191 | break; |
27e543fa | 192 | case MEDIA_GRAPH_INTF_DEVNODE: |
9155d859 | 193 | list_add_tail(&gobj->list, &mdev->interfaces); |
27e543fa | 194 | break; |
bfab2aac | 195 | } |
2521fdac MCC |
196 | |
197 | mdev->topology_version++; | |
198 | ||
39a956c4 | 199 | dev_dbg_obj(__func__, gobj); |
ec6e4c95 MCC |
200 | } |
201 | ||
c350ef83 | 202 | void media_gobj_destroy(struct media_gobj *gobj) |
ec6e4c95 | 203 | { |
39a956c4 | 204 | dev_dbg_obj(__func__, gobj); |
9155d859 | 205 | |
2521fdac MCC |
206 | gobj->mdev->topology_version++; |
207 | ||
9155d859 MCC |
208 | /* Remove the object from mdev list */ |
209 | list_del(&gobj->list); | |
ec6e4c95 MCC |
210 | } |
211 | ||
1fc25d30 MCC |
212 | int media_entity_pads_init(struct media_entity *entity, u16 num_pads, |
213 | struct media_pad *pads) | |
53e269c1 | 214 | { |
db141a35 | 215 | struct media_device *mdev = entity->graph_obj.mdev; |
53e269c1 LP |
216 | unsigned int i; |
217 | ||
53e269c1 LP |
218 | entity->num_pads = num_pads; |
219 | entity->pads = pads; | |
53e269c1 | 220 | |
db141a35 | 221 | if (mdev) |
e2c91d4d | 222 | mutex_lock(&mdev->graph_mutex); |
db141a35 | 223 | |
53e269c1 LP |
224 | for (i = 0; i < num_pads; i++) { |
225 | pads[i].entity = entity; | |
226 | pads[i].index = i; | |
db141a35 | 227 | if (mdev) |
c350ef83 | 228 | media_gobj_create(mdev, MEDIA_GRAPH_PAD, |
db141a35 | 229 | &entity->pads[i].graph_obj); |
53e269c1 LP |
230 | } |
231 | ||
db141a35 | 232 | if (mdev) |
e2c91d4d | 233 | mutex_unlock(&mdev->graph_mutex); |
db141a35 | 234 | |
53e269c1 LP |
235 | return 0; |
236 | } | |
ab22e77c | 237 | EXPORT_SYMBOL_GPL(media_entity_pads_init); |
53e269c1 | 238 | |
a5ccc48a SA |
239 | /* ----------------------------------------------------------------------------- |
240 | * Graph traversal | |
241 | */ | |
242 | ||
243 | static struct media_entity * | |
244 | media_entity_other(struct media_entity *entity, struct media_link *link) | |
245 | { | |
246 | if (link->source->entity == entity) | |
247 | return link->sink->entity; | |
248 | else | |
249 | return link->source->entity; | |
250 | } | |
251 | ||
252 | /* push an entity to traversal stack */ | |
253 | static void stack_push(struct media_entity_graph *graph, | |
254 | struct media_entity *entity) | |
255 | { | |
256 | if (graph->top == MEDIA_ENTITY_ENUM_MAX_DEPTH - 1) { | |
257 | WARN_ON(1); | |
258 | return; | |
259 | } | |
260 | graph->top++; | |
313895fb | 261 | graph->stack[graph->top].link = entity->links.next; |
a5ccc48a SA |
262 | graph->stack[graph->top].entity = entity; |
263 | } | |
264 | ||
265 | static struct media_entity *stack_pop(struct media_entity_graph *graph) | |
266 | { | |
267 | struct media_entity *entity; | |
268 | ||
269 | entity = graph->stack[graph->top].entity; | |
270 | graph->top--; | |
271 | ||
272 | return entity; | |
273 | } | |
274 | ||
a5ccc48a SA |
275 | #define link_top(en) ((en)->stack[(en)->top].link) |
276 | #define stack_top(en) ((en)->stack[(en)->top].entity) | |
277 | ||
0798ce4a SA |
278 | /* |
279 | * TODO: Get rid of this. | |
280 | */ | |
430a672c | 281 | #define MEDIA_ENTITY_MAX_PADS 512 |
0798ce4a | 282 | |
e03d2203 SA |
283 | /** |
284 | * media_entity_graph_walk_init - Allocate resources for graph walk | |
285 | * @graph: Media graph structure that will be used to walk the graph | |
286 | * @mdev: Media device | |
287 | * | |
288 | * Reserve resources for graph walk in media device's current | |
289 | * state. The memory must be released using | |
290 | * media_entity_graph_walk_free(). | |
291 | * | |
292 | * Returns error on failure, zero on success. | |
293 | */ | |
294 | __must_check int media_entity_graph_walk_init( | |
295 | struct media_entity_graph *graph, struct media_device *mdev) | |
296 | { | |
29d8da02 | 297 | return media_entity_enum_init(&graph->ent_enum, mdev); |
e03d2203 SA |
298 | } |
299 | EXPORT_SYMBOL_GPL(media_entity_graph_walk_init); | |
300 | ||
301 | /** | |
302 | * media_entity_graph_walk_cleanup - Release resources related to graph walking | |
303 | * @graph: Media graph structure that was used to walk the graph | |
304 | */ | |
305 | void media_entity_graph_walk_cleanup(struct media_entity_graph *graph) | |
306 | { | |
29d8da02 | 307 | media_entity_enum_cleanup(&graph->ent_enum); |
e03d2203 SA |
308 | } |
309 | EXPORT_SYMBOL_GPL(media_entity_graph_walk_cleanup); | |
310 | ||
a5ccc48a SA |
311 | void media_entity_graph_walk_start(struct media_entity_graph *graph, |
312 | struct media_entity *entity) | |
313 | { | |
29d8da02 SA |
314 | media_entity_enum_zero(&graph->ent_enum); |
315 | media_entity_enum_set(&graph->ent_enum, entity); | |
316 | ||
a5ccc48a SA |
317 | graph->top = 0; |
318 | graph->stack[graph->top].entity = NULL; | |
319 | stack_push(graph, entity); | |
320 | } | |
321 | EXPORT_SYMBOL_GPL(media_entity_graph_walk_start); | |
322 | ||
a5ccc48a SA |
323 | struct media_entity * |
324 | media_entity_graph_walk_next(struct media_entity_graph *graph) | |
325 | { | |
326 | if (stack_top(graph) == NULL) | |
327 | return NULL; | |
328 | ||
329 | /* | |
330 | * Depth first search. Push entity to stack and continue from | |
331 | * top of the stack until no more entities on the level can be | |
332 | * found. | |
333 | */ | |
313895fb | 334 | while (link_top(graph) != &stack_top(graph)->links) { |
a5ccc48a | 335 | struct media_entity *entity = stack_top(graph); |
57208e5e | 336 | struct media_link *link; |
a5ccc48a SA |
337 | struct media_entity *next; |
338 | ||
57208e5e MCC |
339 | link = list_entry(link_top(graph), typeof(*link), list); |
340 | ||
a5ccc48a SA |
341 | /* The link is not enabled so we do not follow. */ |
342 | if (!(link->flags & MEDIA_LNK_FL_ENABLED)) { | |
57208e5e | 343 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
344 | continue; |
345 | } | |
346 | ||
347 | /* Get the entity in the other end of the link . */ | |
348 | next = media_entity_other(entity, link); | |
349 | ||
5c7b25b9 | 350 | /* Has the entity already been visited? */ |
29d8da02 | 351 | if (media_entity_enum_test_and_set(&graph->ent_enum, next)) { |
57208e5e | 352 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
353 | continue; |
354 | } | |
355 | ||
356 | /* Push the new entity to stack and start over. */ | |
57208e5e | 357 | link_top(graph) = link_top(graph)->next; |
a5ccc48a SA |
358 | stack_push(graph, next); |
359 | } | |
360 | ||
361 | return stack_pop(graph); | |
362 | } | |
363 | EXPORT_SYMBOL_GPL(media_entity_graph_walk_next); | |
364 | ||
e02188c9 LP |
365 | /* ----------------------------------------------------------------------------- |
366 | * Pipeline management | |
367 | */ | |
368 | ||
fb49f204 SK |
369 | __must_check int __media_entity_pipeline_start(struct media_entity *entity, |
370 | struct media_pipeline *pipe) | |
e02188c9 | 371 | { |
d10c9894 | 372 | struct media_device *mdev = entity->graph_obj.mdev; |
5dd8775d | 373 | struct media_entity_graph *graph = &pipe->graph; |
af88be38 | 374 | struct media_entity *entity_err = entity; |
57208e5e | 375 | struct media_link *link; |
af88be38 | 376 | int ret; |
e02188c9 | 377 | |
74a41330 SA |
378 | if (!pipe->streaming_count++) { |
379 | ret = media_entity_graph_walk_init(&pipe->graph, mdev); | |
380 | if (ret) | |
381 | goto error_graph_walk_start; | |
106b9907 SA |
382 | } |
383 | ||
384 | media_entity_graph_walk_start(&pipe->graph, entity); | |
e02188c9 | 385 | |
5dd8775d | 386 | while ((entity = media_entity_graph_walk_next(graph))) { |
ef69ee1b MCC |
387 | DECLARE_BITMAP(active, MEDIA_ENTITY_MAX_PADS); |
388 | DECLARE_BITMAP(has_no_links, MEDIA_ENTITY_MAX_PADS); | |
af88be38 | 389 | |
e02188c9 | 390 | entity->stream_count++; |
8aaf62b5 SA |
391 | |
392 | if (WARN_ON(entity->pipe && entity->pipe != pipe)) { | |
393 | ret = -EBUSY; | |
394 | goto error; | |
395 | } | |
396 | ||
e02188c9 | 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 | ||
57208e5e | 409 | list_for_each_entry(link, &entity->links, list) { |
de49c285 SA |
410 | struct media_pad *pad = link->sink->entity == entity |
411 | ? link->sink : link->source; | |
412 | ||
413 | /* Mark that a pad is connected by a link. */ | |
414 | bitmap_clear(has_no_links, pad->index, 1); | |
415 | ||
416 | /* | |
417 | * Pads that either do not need to connect or | |
418 | * are connected through an enabled link are | |
419 | * fine. | |
420 | */ | |
421 | if (!(pad->flags & MEDIA_PAD_FL_MUST_CONNECT) || | |
422 | link->flags & MEDIA_LNK_FL_ENABLED) | |
423 | bitmap_set(active, pad->index, 1); | |
424 | ||
425 | /* | |
426 | * Link validation will only take place for | |
427 | * sink ends of the link that are enabled. | |
428 | */ | |
429 | if (link->sink != pad || | |
430 | !(link->flags & MEDIA_LNK_FL_ENABLED)) | |
af88be38 SA |
431 | continue; |
432 | ||
433 | ret = entity->ops->link_validate(link); | |
fab9d30b | 434 | if (ret < 0 && ret != -ENOIOCTLCMD) { |
d10c9894 | 435 | dev_dbg(entity->graph_obj.mdev->dev, |
fab9d30b | 436 | "link validation failed for \"%s\":%u -> \"%s\":%u, error %d\n", |
823ea2a6 SA |
437 | link->source->entity->name, |
438 | link->source->index, | |
439 | entity->name, link->sink->index, ret); | |
af88be38 | 440 | goto error; |
fab9d30b | 441 | } |
af88be38 | 442 | } |
de49c285 SA |
443 | |
444 | /* Either no links or validated links are fine. */ | |
445 | bitmap_or(active, active, has_no_links, entity->num_pads); | |
446 | ||
447 | if (!bitmap_full(active, entity->num_pads)) { | |
47dfdb3a | 448 | ret = -ENOLINK; |
d10c9894 | 449 | dev_dbg(entity->graph_obj.mdev->dev, |
fab9d30b SA |
450 | "\"%s\":%u must be connected by an enabled link\n", |
451 | entity->name, | |
094f1ca5 SA |
452 | (unsigned)find_first_zero_bit( |
453 | active, entity->num_pads)); | |
de49c285 SA |
454 | goto error; |
455 | } | |
e02188c9 LP |
456 | } |
457 | ||
af88be38 SA |
458 | return 0; |
459 | ||
460 | error: | |
461 | /* | |
462 | * Link validation on graph failed. We revert what we did and | |
463 | * return the error. | |
464 | */ | |
5dd8775d | 465 | media_entity_graph_walk_start(graph, entity_err); |
af88be38 | 466 | |
5dd8775d | 467 | while ((entity_err = media_entity_graph_walk_next(graph))) { |
3801bc7d SK |
468 | /* don't let the stream_count go negative */ |
469 | if (entity->stream_count > 0) { | |
470 | entity_err->stream_count--; | |
471 | if (entity_err->stream_count == 0) | |
472 | entity_err->pipe = NULL; | |
473 | } | |
af88be38 SA |
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 | ||
74a41330 SA |
483 | error_graph_walk_start: |
484 | if (!--pipe->streaming_count) | |
485 | media_entity_graph_walk_cleanup(graph); | |
106b9907 | 486 | |
fb49f204 SK |
487 | return ret; |
488 | } | |
489 | EXPORT_SYMBOL_GPL(__media_entity_pipeline_start); | |
af88be38 | 490 | |
fb49f204 SK |
491 | __must_check int media_entity_pipeline_start(struct media_entity *entity, |
492 | struct media_pipeline *pipe) | |
493 | { | |
494 | struct media_device *mdev = entity->graph_obj.mdev; | |
495 | int ret; | |
496 | ||
497 | mutex_lock(&mdev->graph_mutex); | |
498 | ret = __media_entity_pipeline_start(entity, pipe); | |
499 | mutex_unlock(&mdev->graph_mutex); | |
af88be38 | 500 | return ret; |
e02188c9 LP |
501 | } |
502 | EXPORT_SYMBOL_GPL(media_entity_pipeline_start); | |
503 | ||
fb49f204 | 504 | void __media_entity_pipeline_stop(struct media_entity *entity) |
e02188c9 | 505 | { |
5dd8775d | 506 | struct media_entity_graph *graph = &entity->pipe->graph; |
74a41330 | 507 | struct media_pipeline *pipe = entity->pipe; |
e02188c9 | 508 | |
e02188c9 | 509 | |
74a41330 | 510 | WARN_ON(!pipe->streaming_count); |
5dd8775d | 511 | media_entity_graph_walk_start(graph, entity); |
e02188c9 | 512 | |
5dd8775d | 513 | while ((entity = media_entity_graph_walk_next(graph))) { |
3801bc7d SK |
514 | /* don't let the stream_count go negative */ |
515 | if (entity->stream_count > 0) { | |
516 | entity->stream_count--; | |
517 | if (entity->stream_count == 0) | |
518 | entity->pipe = NULL; | |
519 | } | |
e02188c9 LP |
520 | } |
521 | ||
74a41330 SA |
522 | if (!--pipe->streaming_count) |
523 | media_entity_graph_walk_cleanup(graph); | |
106b9907 | 524 | |
fb49f204 SK |
525 | } |
526 | EXPORT_SYMBOL_GPL(__media_entity_pipeline_stop); | |
527 | ||
528 | void media_entity_pipeline_stop(struct media_entity *entity) | |
529 | { | |
530 | struct media_device *mdev = entity->graph_obj.mdev; | |
531 | ||
532 | mutex_lock(&mdev->graph_mutex); | |
533 | __media_entity_pipeline_stop(entity); | |
e02188c9 LP |
534 | mutex_unlock(&mdev->graph_mutex); |
535 | } | |
536 | EXPORT_SYMBOL_GPL(media_entity_pipeline_stop); | |
537 | ||
503c3d82 LP |
538 | /* ----------------------------------------------------------------------------- |
539 | * Module use count | |
540 | */ | |
541 | ||
503c3d82 LP |
542 | struct media_entity *media_entity_get(struct media_entity *entity) |
543 | { | |
544 | if (entity == NULL) | |
545 | return NULL; | |
546 | ||
d10c9894 JMC |
547 | if (entity->graph_obj.mdev->dev && |
548 | !try_module_get(entity->graph_obj.mdev->dev->driver->owner)) | |
503c3d82 LP |
549 | return NULL; |
550 | ||
551 | return entity; | |
552 | } | |
553 | EXPORT_SYMBOL_GPL(media_entity_get); | |
554 | ||
503c3d82 LP |
555 | void media_entity_put(struct media_entity *entity) |
556 | { | |
557 | if (entity == NULL) | |
558 | return; | |
559 | ||
d10c9894 JMC |
560 | if (entity->graph_obj.mdev->dev) |
561 | module_put(entity->graph_obj.mdev->dev->driver->owner); | |
503c3d82 LP |
562 | } |
563 | EXPORT_SYMBOL_GPL(media_entity_put); | |
564 | ||
a5ccc48a SA |
565 | /* ----------------------------------------------------------------------------- |
566 | * Links management | |
567 | */ | |
568 | ||
23615de5 | 569 | static struct media_link *media_add_link(struct list_head *head) |
53e269c1 | 570 | { |
57208e5e | 571 | struct media_link *link; |
53e269c1 | 572 | |
57208e5e MCC |
573 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
574 | if (link == NULL) | |
575 | return NULL; | |
53e269c1 | 576 | |
23615de5 | 577 | list_add_tail(&link->list, head); |
53e269c1 | 578 | |
57208e5e | 579 | return link; |
53e269c1 LP |
580 | } |
581 | ||
57208e5e | 582 | static void __media_entity_remove_link(struct media_entity *entity, |
5abad22f MCC |
583 | struct media_link *link) |
584 | { | |
585 | struct media_link *rlink, *tmp; | |
586 | struct media_entity *remote; | |
5abad22f MCC |
587 | |
588 | if (link->source->entity == entity) | |
589 | remote = link->sink->entity; | |
590 | else | |
591 | remote = link->source->entity; | |
592 | ||
593 | list_for_each_entry_safe(rlink, tmp, &remote->links, list) { | |
58f69ee9 | 594 | if (rlink != link->reverse) |
5abad22f | 595 | continue; |
5abad22f MCC |
596 | |
597 | if (link->source->entity == entity) | |
598 | remote->num_backlinks--; | |
599 | ||
600 | /* Remove the remote link */ | |
601 | list_del(&rlink->list); | |
c350ef83 | 602 | media_gobj_destroy(&rlink->graph_obj); |
5abad22f MCC |
603 | kfree(rlink); |
604 | ||
605 | if (--remote->num_links == 0) | |
606 | break; | |
607 | } | |
608 | list_del(&link->list); | |
c350ef83 | 609 | media_gobj_destroy(&link->graph_obj); |
5abad22f MCC |
610 | kfree(link); |
611 | } | |
57208e5e | 612 | |
53e269c1 | 613 | int |
8df00a15 | 614 | media_create_pad_link(struct media_entity *source, u16 source_pad, |
53e269c1 LP |
615 | struct media_entity *sink, u16 sink_pad, u32 flags) |
616 | { | |
617 | struct media_link *link; | |
618 | struct media_link *backlink; | |
619 | ||
620 | BUG_ON(source == NULL || sink == NULL); | |
621 | BUG_ON(source_pad >= source->num_pads); | |
622 | BUG_ON(sink_pad >= sink->num_pads); | |
623 | ||
23615de5 | 624 | link = media_add_link(&source->links); |
53e269c1 LP |
625 | if (link == NULL) |
626 | return -ENOMEM; | |
627 | ||
628 | link->source = &source->pads[source_pad]; | |
629 | link->sink = &sink->pads[sink_pad]; | |
82ae2a50 | 630 | link->flags = flags & ~MEDIA_LNK_FL_INTERFACE_LINK; |
53e269c1 | 631 | |
6b6a4278 | 632 | /* Initialize graph object embedded at the new link */ |
c350ef83 | 633 | media_gobj_create(source->graph_obj.mdev, MEDIA_GRAPH_LINK, |
d10c9894 | 634 | &link->graph_obj); |
6b6a4278 | 635 | |
53e269c1 LP |
636 | /* Create the backlink. Backlinks are used to help graph traversal and |
637 | * are not reported to userspace. | |
638 | */ | |
23615de5 | 639 | backlink = media_add_link(&sink->links); |
53e269c1 | 640 | if (backlink == NULL) { |
57208e5e | 641 | __media_entity_remove_link(source, link); |
53e269c1 LP |
642 | return -ENOMEM; |
643 | } | |
644 | ||
645 | backlink->source = &source->pads[source_pad]; | |
646 | backlink->sink = &sink->pads[sink_pad]; | |
647 | backlink->flags = flags; | |
39d1ebc6 | 648 | backlink->is_backlink = true; |
53e269c1 | 649 | |
6b6a4278 | 650 | /* Initialize graph object embedded at the new link */ |
c350ef83 | 651 | media_gobj_create(sink->graph_obj.mdev, MEDIA_GRAPH_LINK, |
d10c9894 | 652 | &backlink->graph_obj); |
6b6a4278 | 653 | |
53e269c1 LP |
654 | link->reverse = backlink; |
655 | backlink->reverse = link; | |
656 | ||
657 | sink->num_backlinks++; | |
57208e5e MCC |
658 | sink->num_links++; |
659 | source->num_links++; | |
53e269c1 LP |
660 | |
661 | return 0; | |
662 | } | |
8df00a15 | 663 | EXPORT_SYMBOL_GPL(media_create_pad_link); |
97548ed4 | 664 | |
b01cc9ce MCC |
665 | int media_create_pad_links(const struct media_device *mdev, |
666 | const u32 source_function, | |
667 | struct media_entity *source, | |
668 | const u16 source_pad, | |
669 | const u32 sink_function, | |
670 | struct media_entity *sink, | |
671 | const u16 sink_pad, | |
672 | u32 flags, | |
673 | const bool allow_both_undefined) | |
674 | { | |
675 | struct media_entity *entity; | |
676 | unsigned function; | |
677 | int ret; | |
678 | ||
679 | /* Trivial case: 1:1 relation */ | |
680 | if (source && sink) | |
681 | return media_create_pad_link(source, source_pad, | |
682 | sink, sink_pad, flags); | |
683 | ||
684 | /* Worse case scenario: n:n relation */ | |
685 | if (!source && !sink) { | |
686 | if (!allow_both_undefined) | |
687 | return 0; | |
688 | media_device_for_each_entity(source, mdev) { | |
689 | if (source->function != source_function) | |
690 | continue; | |
691 | media_device_for_each_entity(sink, mdev) { | |
692 | if (sink->function != sink_function) | |
693 | continue; | |
694 | ret = media_create_pad_link(source, source_pad, | |
695 | sink, sink_pad, | |
696 | flags); | |
697 | if (ret) | |
698 | return ret; | |
699 | flags &= ~(MEDIA_LNK_FL_ENABLED | | |
700 | MEDIA_LNK_FL_IMMUTABLE); | |
701 | } | |
702 | } | |
703 | return 0; | |
704 | } | |
705 | ||
706 | /* Handle 1:n and n:1 cases */ | |
707 | if (source) | |
708 | function = sink_function; | |
709 | else | |
710 | function = source_function; | |
711 | ||
712 | media_device_for_each_entity(entity, mdev) { | |
713 | if (entity->function != function) | |
714 | continue; | |
715 | ||
716 | if (source) | |
717 | ret = media_create_pad_link(source, source_pad, | |
718 | entity, sink_pad, flags); | |
719 | else | |
720 | ret = media_create_pad_link(entity, source_pad, | |
721 | sink, sink_pad, flags); | |
722 | if (ret) | |
723 | return ret; | |
724 | flags &= ~(MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE); | |
725 | } | |
726 | return 0; | |
727 | } | |
728 | EXPORT_SYMBOL_GPL(media_create_pad_links); | |
729 | ||
57208e5e MCC |
730 | void __media_entity_remove_links(struct media_entity *entity) |
731 | { | |
732 | struct media_link *link, *tmp; | |
7349cec1 | 733 | |
57208e5e MCC |
734 | list_for_each_entry_safe(link, tmp, &entity->links, list) |
735 | __media_entity_remove_link(entity, link); | |
7349cec1 SN |
736 | |
737 | entity->num_links = 0; | |
738 | entity->num_backlinks = 0; | |
739 | } | |
740 | EXPORT_SYMBOL_GPL(__media_entity_remove_links); | |
741 | ||
742 | void media_entity_remove_links(struct media_entity *entity) | |
743 | { | |
cc4a8258 MCC |
744 | struct media_device *mdev = entity->graph_obj.mdev; |
745 | ||
7349cec1 | 746 | /* Do nothing if the entity is not registered. */ |
cc4a8258 | 747 | if (mdev == NULL) |
7349cec1 SN |
748 | return; |
749 | ||
e2c91d4d | 750 | mutex_lock(&mdev->graph_mutex); |
7349cec1 | 751 | __media_entity_remove_links(entity); |
e2c91d4d | 752 | mutex_unlock(&mdev->graph_mutex); |
7349cec1 SN |
753 | } |
754 | EXPORT_SYMBOL_GPL(media_entity_remove_links); | |
755 | ||
97548ed4 LP |
756 | static int __media_entity_setup_link_notify(struct media_link *link, u32 flags) |
757 | { | |
97548ed4 LP |
758 | int ret; |
759 | ||
760 | /* Notify both entities. */ | |
761 | ret = media_entity_call(link->source->entity, link_setup, | |
762 | link->source, link->sink, flags); | |
763 | if (ret < 0 && ret != -ENOIOCTLCMD) | |
764 | return ret; | |
765 | ||
766 | ret = media_entity_call(link->sink->entity, link_setup, | |
767 | link->sink, link->source, flags); | |
768 | if (ret < 0 && ret != -ENOIOCTLCMD) { | |
769 | media_entity_call(link->source->entity, link_setup, | |
770 | link->source, link->sink, link->flags); | |
771 | return ret; | |
772 | } | |
773 | ||
7a6f0b22 | 774 | link->flags = flags; |
97548ed4 LP |
775 | link->reverse->flags = link->flags; |
776 | ||
777 | return 0; | |
778 | } | |
779 | ||
97548ed4 LP |
780 | int __media_entity_setup_link(struct media_link *link, u32 flags) |
781 | { | |
7a6f0b22 | 782 | const u32 mask = MEDIA_LNK_FL_ENABLED; |
97548ed4 LP |
783 | struct media_device *mdev; |
784 | struct media_entity *source, *sink; | |
785 | int ret = -EBUSY; | |
786 | ||
787 | if (link == NULL) | |
788 | return -EINVAL; | |
789 | ||
7a6f0b22 LP |
790 | /* The non-modifiable link flags must not be modified. */ |
791 | if ((link->flags & ~mask) != (flags & ~mask)) | |
792 | return -EINVAL; | |
793 | ||
97548ed4 LP |
794 | if (link->flags & MEDIA_LNK_FL_IMMUTABLE) |
795 | return link->flags == flags ? 0 : -EINVAL; | |
796 | ||
797 | if (link->flags == flags) | |
798 | return 0; | |
799 | ||
800 | source = link->source->entity; | |
801 | sink = link->sink->entity; | |
802 | ||
e02188c9 LP |
803 | if (!(link->flags & MEDIA_LNK_FL_DYNAMIC) && |
804 | (source->stream_count || sink->stream_count)) | |
805 | return -EBUSY; | |
806 | ||
d10c9894 | 807 | mdev = source->graph_obj.mdev; |
97548ed4 | 808 | |
813f5c0a SN |
809 | if (mdev->link_notify) { |
810 | ret = mdev->link_notify(link, flags, | |
811 | MEDIA_DEV_NOTIFY_PRE_LINK_CH); | |
97548ed4 LP |
812 | if (ret < 0) |
813 | return ret; | |
814 | } | |
815 | ||
816 | ret = __media_entity_setup_link_notify(link, flags); | |
97548ed4 | 817 | |
813f5c0a SN |
818 | if (mdev->link_notify) |
819 | mdev->link_notify(link, flags, MEDIA_DEV_NOTIFY_POST_LINK_CH); | |
97548ed4 LP |
820 | |
821 | return ret; | |
822 | } | |
efc70278 | 823 | EXPORT_SYMBOL_GPL(__media_entity_setup_link); |
97548ed4 LP |
824 | |
825 | int media_entity_setup_link(struct media_link *link, u32 flags) | |
826 | { | |
827 | int ret; | |
828 | ||
5c883edb | 829 | mutex_lock(&link->graph_obj.mdev->graph_mutex); |
97548ed4 | 830 | ret = __media_entity_setup_link(link, flags); |
5c883edb | 831 | mutex_unlock(&link->graph_obj.mdev->graph_mutex); |
97548ed4 LP |
832 | |
833 | return ret; | |
834 | } | |
835 | EXPORT_SYMBOL_GPL(media_entity_setup_link); | |
836 | ||
97548ed4 LP |
837 | struct media_link * |
838 | media_entity_find_link(struct media_pad *source, struct media_pad *sink) | |
839 | { | |
840 | struct media_link *link; | |
97548ed4 | 841 | |
57208e5e | 842 | list_for_each_entry(link, &source->entity->links, list) { |
97548ed4 LP |
843 | if (link->source->entity == source->entity && |
844 | link->source->index == source->index && | |
845 | link->sink->entity == sink->entity && | |
846 | link->sink->index == sink->index) | |
847 | return link; | |
848 | } | |
849 | ||
850 | return NULL; | |
851 | } | |
852 | EXPORT_SYMBOL_GPL(media_entity_find_link); | |
853 | ||
1bddf1b3 | 854 | struct media_pad *media_entity_remote_pad(struct media_pad *pad) |
97548ed4 | 855 | { |
57208e5e | 856 | struct media_link *link; |
97548ed4 | 857 | |
57208e5e | 858 | list_for_each_entry(link, &pad->entity->links, list) { |
97548ed4 LP |
859 | if (!(link->flags & MEDIA_LNK_FL_ENABLED)) |
860 | continue; | |
861 | ||
862 | if (link->source == pad) | |
863 | return link->sink; | |
864 | ||
865 | if (link->sink == pad) | |
866 | return link->source; | |
867 | } | |
868 | ||
869 | return NULL; | |
870 | ||
871 | } | |
1bddf1b3 | 872 | EXPORT_SYMBOL_GPL(media_entity_remote_pad); |
27e543fa | 873 | |
1283f849 MCC |
874 | static void media_interface_init(struct media_device *mdev, |
875 | struct media_interface *intf, | |
876 | u32 gobj_type, | |
877 | u32 intf_type, u32 flags) | |
878 | { | |
879 | intf->type = intf_type; | |
880 | intf->flags = flags; | |
881 | INIT_LIST_HEAD(&intf->links); | |
882 | ||
c350ef83 | 883 | media_gobj_create(mdev, gobj_type, &intf->graph_obj); |
1283f849 MCC |
884 | } |
885 | ||
27e543fa MCC |
886 | /* Functions related to the media interface via device nodes */ |
887 | ||
888 | struct media_intf_devnode *media_devnode_create(struct media_device *mdev, | |
889 | u32 type, u32 flags, | |
0b3b72df | 890 | u32 major, u32 minor) |
27e543fa MCC |
891 | { |
892 | struct media_intf_devnode *devnode; | |
27e543fa | 893 | |
0b3b72df | 894 | devnode = kzalloc(sizeof(*devnode), GFP_KERNEL); |
27e543fa MCC |
895 | if (!devnode) |
896 | return NULL; | |
897 | ||
27e543fa MCC |
898 | devnode->major = major; |
899 | devnode->minor = minor; | |
900 | ||
1283f849 MCC |
901 | media_interface_init(mdev, &devnode->intf, MEDIA_GRAPH_INTF_DEVNODE, |
902 | type, flags); | |
27e543fa MCC |
903 | |
904 | return devnode; | |
905 | } | |
906 | EXPORT_SYMBOL_GPL(media_devnode_create); | |
907 | ||
908 | void media_devnode_remove(struct media_intf_devnode *devnode) | |
909 | { | |
7c4696a9 | 910 | media_remove_intf_links(&devnode->intf); |
c350ef83 | 911 | media_gobj_destroy(&devnode->intf.graph_obj); |
27e543fa MCC |
912 | kfree(devnode); |
913 | } | |
914 | EXPORT_SYMBOL_GPL(media_devnode_remove); | |
86e26620 MCC |
915 | |
916 | struct media_link *media_create_intf_link(struct media_entity *entity, | |
917 | struct media_interface *intf, | |
918 | u32 flags) | |
919 | { | |
920 | struct media_link *link; | |
921 | ||
922 | link = media_add_link(&intf->links); | |
923 | if (link == NULL) | |
924 | return NULL; | |
925 | ||
926 | link->intf = intf; | |
927 | link->entity = entity; | |
82ae2a50 | 928 | link->flags = flags | MEDIA_LNK_FL_INTERFACE_LINK; |
86e26620 MCC |
929 | |
930 | /* Initialize graph object embedded at the new link */ | |
c350ef83 | 931 | media_gobj_create(intf->graph_obj.mdev, MEDIA_GRAPH_LINK, |
86e26620 MCC |
932 | &link->graph_obj); |
933 | ||
934 | return link; | |
935 | } | |
936 | EXPORT_SYMBOL_GPL(media_create_intf_link); | |
937 | ||
d47109fa | 938 | void __media_remove_intf_link(struct media_link *link) |
86e26620 | 939 | { |
d47109fa | 940 | list_del(&link->list); |
c350ef83 | 941 | media_gobj_destroy(&link->graph_obj); |
86e26620 MCC |
942 | kfree(link); |
943 | } | |
d47109fa | 944 | EXPORT_SYMBOL_GPL(__media_remove_intf_link); |
86e26620 MCC |
945 | |
946 | void media_remove_intf_link(struct media_link *link) | |
947 | { | |
cc4a8258 MCC |
948 | struct media_device *mdev = link->graph_obj.mdev; |
949 | ||
950 | /* Do nothing if the intf is not registered. */ | |
951 | if (mdev == NULL) | |
952 | return; | |
953 | ||
e2c91d4d | 954 | mutex_lock(&mdev->graph_mutex); |
86e26620 | 955 | __media_remove_intf_link(link); |
e2c91d4d | 956 | mutex_unlock(&mdev->graph_mutex); |
86e26620 MCC |
957 | } |
958 | EXPORT_SYMBOL_GPL(media_remove_intf_link); | |
7c4696a9 MCC |
959 | |
960 | void __media_remove_intf_links(struct media_interface *intf) | |
961 | { | |
962 | struct media_link *link, *tmp; | |
963 | ||
964 | list_for_each_entry_safe(link, tmp, &intf->links, list) | |
965 | __media_remove_intf_link(link); | |
966 | ||
967 | } | |
968 | EXPORT_SYMBOL_GPL(__media_remove_intf_links); | |
969 | ||
970 | void media_remove_intf_links(struct media_interface *intf) | |
971 | { | |
cc4a8258 MCC |
972 | struct media_device *mdev = intf->graph_obj.mdev; |
973 | ||
7c4696a9 | 974 | /* Do nothing if the intf is not registered. */ |
cc4a8258 | 975 | if (mdev == NULL) |
7c4696a9 MCC |
976 | return; |
977 | ||
e2c91d4d | 978 | mutex_lock(&mdev->graph_mutex); |
7c4696a9 | 979 | __media_remove_intf_links(intf); |
e2c91d4d | 980 | mutex_unlock(&mdev->graph_mutex); |
7c4696a9 MCC |
981 | } |
982 | EXPORT_SYMBOL_GPL(media_remove_intf_links); |