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Laurent Pinchart53e269c2009-12-09 08:40:00 -03001/*
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
Laurent Pinchart5c7b25b2013-06-07 12:45:11 -030023#include <linux/bitmap.h>
Laurent Pinchart53e269c2009-12-09 08:40:00 -030024#include <linux/module.h>
25#include <linux/slab.h>
26#include <media/media-entity.h>
Laurent Pinchart503c3d822010-03-07 15:04:59 -030027#include <media/media-device.h>
Laurent Pinchart53e269c2009-12-09 08:40:00 -030028
Mauro Carvalho Chehab39a956c2015-08-13 14:42:42 -030029static 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";
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -030038 case MEDIA_GRAPH_INTF_DEVNODE:
39 return "intf-devnode";
Mauro Carvalho Chehab39a956c2015-08-13 14:42:42 -030040 default:
41 return "unknown";
42 }
43}
44
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -030045static inline const char *intf_type(struct media_interface *intf)
46{
47 switch (intf->type) {
48 case MEDIA_INTF_T_DVB_FE:
Shuah Khan66c1db12016-03-04 18:14:05 -030049 return "dvb-frontend";
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -030050 case MEDIA_INTF_T_DVB_DEMUX:
Shuah Khan66c1db12016-03-04 18:14:05 -030051 return "dvb-demux";
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -030052 case MEDIA_INTF_T_DVB_DVR:
Shuah Khan66c1db12016-03-04 18:14:05 -030053 return "dvb-dvr";
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -030054 case MEDIA_INTF_T_DVB_CA:
Shuah Khan66c1db12016-03-04 18:14:05 -030055 return "dvb-ca";
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -030056 case MEDIA_INTF_T_DVB_NET:
Shuah Khan66c1db12016-03-04 18:14:05 -030057 return "dvb-net";
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -030058 case MEDIA_INTF_T_V4L_VIDEO:
Shuah Khan66c1db12016-03-04 18:14:05 -030059 return "v4l-video";
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -030060 case MEDIA_INTF_T_V4L_VBI:
Shuah Khan66c1db12016-03-04 18:14:05 -030061 return "v4l-vbi";
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -030062 case MEDIA_INTF_T_V4L_RADIO:
Shuah Khan66c1db12016-03-04 18:14:05 -030063 return "v4l-radio";
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -030064 case MEDIA_INTF_T_V4L_SUBDEV:
Shuah Khan66c1db12016-03-04 18:14:05 -030065 return "v4l-subdev";
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -030066 case MEDIA_INTF_T_V4L_SWRADIO:
Shuah Khan66c1db12016-03-04 18:14:05 -030067 return "v4l-swradio";
Shuah Khan5af557a2016-02-11 21:41:18 -020068 case MEDIA_INTF_T_ALSA_PCM_CAPTURE:
Shuah Khan66c1db12016-03-04 18:14:05 -030069 return "alsa-pcm-capture";
Shuah Khan5af557a2016-02-11 21:41:18 -020070 case MEDIA_INTF_T_ALSA_PCM_PLAYBACK:
Shuah Khan66c1db12016-03-04 18:14:05 -030071 return "alsa-pcm-playback";
Shuah Khan5af557a2016-02-11 21:41:18 -020072 case MEDIA_INTF_T_ALSA_CONTROL:
73 return "alsa-control";
74 case MEDIA_INTF_T_ALSA_COMPRESS:
Shuah Khan66c1db12016-03-04 18:14:05 -030075 return "alsa-compress";
Shuah Khan5af557a2016-02-11 21:41:18 -020076 case MEDIA_INTF_T_ALSA_RAWMIDI:
Shuah Khan66c1db12016-03-04 18:14:05 -030077 return "alsa-rawmidi";
Shuah Khan5af557a2016-02-11 21:41:18 -020078 case MEDIA_INTF_T_ALSA_HWDEP:
Shuah Khan66c1db12016-03-04 18:14:05 -030079 return "alsa-hwdep";
Shuah Khan5af557a2016-02-11 21:41:18 -020080 case MEDIA_INTF_T_ALSA_SEQUENCER:
Shuah Khan66c1db12016-03-04 18:14:05 -030081 return "alsa-sequencer";
Shuah Khan5af557a2016-02-11 21:41:18 -020082 case MEDIA_INTF_T_ALSA_TIMER:
Shuah Khan66c1db12016-03-04 18:14:05 -030083 return "alsa-timer";
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -030084 default:
85 return "unknown-intf";
86 }
87};
88
Sakari Ailusc8d54cd2015-12-16 11:44:32 -020089__must_check int __media_entity_enum_init(struct media_entity_enum *ent_enum,
90 int idx_max)
91{
Sakari Ailusf7b5dff2016-01-27 12:47:54 -020092 idx_max = ALIGN(idx_max, BITS_PER_LONG);
93 ent_enum->bmap = kcalloc(idx_max / BITS_PER_LONG, sizeof(long),
94 GFP_KERNEL);
Sakari Ailus030e89e2015-12-16 11:32:36 -020095 if (!ent_enum->bmap)
96 return -ENOMEM;
Sakari Ailusc8d54cd2015-12-16 11:44:32 -020097
98 bitmap_zero(ent_enum->bmap, idx_max);
99 ent_enum->idx_max = idx_max;
100
101 return 0;
102}
103EXPORT_SYMBOL_GPL(__media_entity_enum_init);
104
Sakari Ailusc8d54cd2015-12-16 11:44:32 -0200105void media_entity_enum_cleanup(struct media_entity_enum *ent_enum)
106{
Sakari Ailus030e89e2015-12-16 11:32:36 -0200107 kfree(ent_enum->bmap);
Sakari Ailusc8d54cd2015-12-16 11:44:32 -0200108}
109EXPORT_SYMBOL_GPL(media_entity_enum_cleanup);
110
111/**
Mauro Carvalho Chehab1fc25d32015-12-11 12:14:58 -0200112 * 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 */
Mauro Carvalho Chehab39a956c2015-08-13 14:42:42 -0300120static 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,
Mauro Carvalho Chehab05b3b772015-12-16 14:28:01 -0200126 "%s id %u: entity '%s'\n",
127 event_name, media_id(gobj),
Mauro Carvalho Chehab39a956c2015-08-13 14:42:42 -0300128 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,
Mauro Carvalho Chehab05b3b772015-12-16 14:28:01 -0200135 "%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));
Mauro Carvalho Chehab39a956c2015-08-13 14:42:42 -0300141 break;
142 }
143 case MEDIA_GRAPH_PAD:
144 {
145 struct media_pad *pad = gobj_to_pad(gobj);
146
147 dev_dbg(gobj->mdev->dev,
Mauro Carvalho Chehab05b3b772015-12-16 14:28:01 -0200148 "%s id %u: %s%spad '%s':%d\n",
149 event_name, media_id(gobj),
150 pad->flags & MEDIA_PAD_FL_SINK ? "sink " : "",
Mauro Carvalho Chehab6c24d462015-08-21 18:26:42 -0300151 pad->flags & MEDIA_PAD_FL_SOURCE ? "source " : "",
Mauro Carvalho Chehab39a956c2015-08-13 14:42:42 -0300152 pad->entity->name, pad->index);
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -0300153 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,
Mauro Carvalho Chehab05b3b772015-12-16 14:28:01 -0200161 "%s id %u: intf_devnode %s - major: %d, minor: %d\n",
162 event_name, media_id(gobj),
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -0300163 intf_type(intf),
164 devnode->major, devnode->minor);
165 break;
Mauro Carvalho Chehab39a956c2015-08-13 14:42:42 -0300166 }
167 }
168#endif
169}
170
Mauro Carvalho Chehabc350ef82015-12-11 11:55:40 -0200171void media_gobj_create(struct media_device *mdev,
Mauro Carvalho Chehabec6e4c92015-08-25 10:28:36 -0300172 enum media_gobj_type type,
173 struct media_gobj *gobj)
174{
Mauro Carvalho Chehab8f6d3682015-08-19 20:18:35 -0300175 BUG_ON(!mdev);
176
Mauro Carvalho Chehab39a956c2015-08-13 14:42:42 -0300177 gobj->mdev = mdev;
178
Mauro Carvalho Chehabbfab2aac2015-08-14 12:47:48 -0300179 /* Create a per-type unique object ID */
Mauro Carvalho Chehab05b3b772015-12-16 14:28:01 -0200180 gobj->id = media_gobj_gen_id(type, ++mdev->id);
181
Mauro Carvalho Chehabbfab2aac2015-08-14 12:47:48 -0300182 switch (type) {
183 case MEDIA_GRAPH_ENTITY:
Mauro Carvalho Chehab05bfa9f2015-08-23 07:51:33 -0300184 list_add_tail(&gobj->list, &mdev->entities);
Mauro Carvalho Chehabbfab2aac2015-08-14 12:47:48 -0300185 break;
Mauro Carvalho Chehab18710dc2015-08-14 12:50:08 -0300186 case MEDIA_GRAPH_PAD:
Mauro Carvalho Chehab9155d852015-08-23 08:00:33 -0300187 list_add_tail(&gobj->list, &mdev->pads);
Mauro Carvalho Chehab18710dc2015-08-14 12:50:08 -0300188 break;
Mauro Carvalho Chehab6b6a4272015-08-14 12:54:36 -0300189 case MEDIA_GRAPH_LINK:
Mauro Carvalho Chehab9155d852015-08-23 08:00:33 -0300190 list_add_tail(&gobj->list, &mdev->links);
Mauro Carvalho Chehab6b6a4272015-08-14 12:54:36 -0300191 break;
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -0300192 case MEDIA_GRAPH_INTF_DEVNODE:
Mauro Carvalho Chehab9155d852015-08-23 08:00:33 -0300193 list_add_tail(&gobj->list, &mdev->interfaces);
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -0300194 break;
Mauro Carvalho Chehabbfab2aac2015-08-14 12:47:48 -0300195 }
Mauro Carvalho Chehab2521fda2015-08-23 09:40:26 -0300196
197 mdev->topology_version++;
198
Mauro Carvalho Chehab39a956c2015-08-13 14:42:42 -0300199 dev_dbg_obj(__func__, gobj);
Mauro Carvalho Chehabec6e4c92015-08-25 10:28:36 -0300200}
201
Mauro Carvalho Chehabc350ef82015-12-11 11:55:40 -0200202void media_gobj_destroy(struct media_gobj *gobj)
Mauro Carvalho Chehabec6e4c92015-08-25 10:28:36 -0300203{
Mauro Carvalho Chehab39a956c2015-08-13 14:42:42 -0300204 dev_dbg_obj(__func__, gobj);
Mauro Carvalho Chehab9155d852015-08-23 08:00:33 -0300205
Mauro Carvalho Chehab2521fda2015-08-23 09:40:26 -0300206 gobj->mdev->topology_version++;
207
Mauro Carvalho Chehab9155d852015-08-23 08:00:33 -0300208 /* Remove the object from mdev list */
209 list_del(&gobj->list);
Mauro Carvalho Chehabec6e4c92015-08-25 10:28:36 -0300210}
211
Mauro Carvalho Chehab1fc25d32015-12-11 12:14:58 -0200212int media_entity_pads_init(struct media_entity *entity, u16 num_pads,
213 struct media_pad *pads)
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300214{
Javier Martinez Canillasdb141a32015-09-08 14:10:56 -0300215 struct media_device *mdev = entity->graph_obj.mdev;
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300216 unsigned int i;
217
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300218 entity->num_pads = num_pads;
219 entity->pads = pads;
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300220
Javier Martinez Canillasdb141a32015-09-08 14:10:56 -0300221 if (mdev)
Mauro Carvalho Chehabe2c91d42016-04-06 10:55:24 -0300222 mutex_lock(&mdev->graph_mutex);
Javier Martinez Canillasdb141a32015-09-08 14:10:56 -0300223
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300224 for (i = 0; i < num_pads; i++) {
225 pads[i].entity = entity;
226 pads[i].index = i;
Javier Martinez Canillasdb141a32015-09-08 14:10:56 -0300227 if (mdev)
Mauro Carvalho Chehabc350ef82015-12-11 11:55:40 -0200228 media_gobj_create(mdev, MEDIA_GRAPH_PAD,
Javier Martinez Canillasdb141a32015-09-08 14:10:56 -0300229 &entity->pads[i].graph_obj);
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300230 }
231
Javier Martinez Canillasdb141a32015-09-08 14:10:56 -0300232 if (mdev)
Mauro Carvalho Chehabe2c91d42016-04-06 10:55:24 -0300233 mutex_unlock(&mdev->graph_mutex);
Javier Martinez Canillasdb141a32015-09-08 14:10:56 -0300234
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300235 return 0;
236}
Mauro Carvalho Chehabab22e772015-12-11 07:44:40 -0200237EXPORT_SYMBOL_GPL(media_entity_pads_init);
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300238
Sakari Ailusa5ccc482010-03-07 16:14:14 -0300239/* -----------------------------------------------------------------------------
240 * Graph traversal
241 */
242
243static struct media_entity *
244media_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 */
253static 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++;
Javier Martinez Canillas313895f2015-12-11 15:16:36 -0200261 graph->stack[graph->top].link = entity->links.next;
Sakari Ailusa5ccc482010-03-07 16:14:14 -0300262 graph->stack[graph->top].entity = entity;
263}
264
265static 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
Sakari Ailusa5ccc482010-03-07 16:14:14 -0300275#define link_top(en) ((en)->stack[(en)->top].link)
276#define stack_top(en) ((en)->stack[(en)->top].entity)
277
Sakari Ailus0798ce42015-12-16 11:32:37 -0200278/*
279 * TODO: Get rid of this.
280 */
Mauro Carvalho Chehab430a6722015-12-16 15:18:25 -0200281#define MEDIA_ENTITY_MAX_PADS 512
Sakari Ailus0798ce42015-12-16 11:32:37 -0200282
Sakari Ailuse03d2202015-12-16 11:32:22 -0200283/**
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{
Sakari Ailus29d8da02015-12-16 11:32:28 -0200297 return media_entity_enum_init(&graph->ent_enum, mdev);
Sakari Ailuse03d2202015-12-16 11:32:22 -0200298}
299EXPORT_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 */
305void media_entity_graph_walk_cleanup(struct media_entity_graph *graph)
306{
Sakari Ailus29d8da02015-12-16 11:32:28 -0200307 media_entity_enum_cleanup(&graph->ent_enum);
Sakari Ailuse03d2202015-12-16 11:32:22 -0200308}
309EXPORT_SYMBOL_GPL(media_entity_graph_walk_cleanup);
310
Sakari Ailusa5ccc482010-03-07 16:14:14 -0300311void media_entity_graph_walk_start(struct media_entity_graph *graph,
312 struct media_entity *entity)
313{
Sakari Ailus29d8da02015-12-16 11:32:28 -0200314 media_entity_enum_zero(&graph->ent_enum);
315 media_entity_enum_set(&graph->ent_enum, entity);
316
Sakari Ailusa5ccc482010-03-07 16:14:14 -0300317 graph->top = 0;
318 graph->stack[graph->top].entity = NULL;
319 stack_push(graph, entity);
320}
321EXPORT_SYMBOL_GPL(media_entity_graph_walk_start);
322
Sakari Ailusa5ccc482010-03-07 16:14:14 -0300323struct media_entity *
324media_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 */
Javier Martinez Canillas313895f2015-12-11 15:16:36 -0200334 while (link_top(graph) != &stack_top(graph)->links) {
Sakari Ailusa5ccc482010-03-07 16:14:14 -0300335 struct media_entity *entity = stack_top(graph);
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300336 struct media_link *link;
Sakari Ailusa5ccc482010-03-07 16:14:14 -0300337 struct media_entity *next;
338
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300339 link = list_entry(link_top(graph), typeof(*link), list);
340
Sakari Ailusa5ccc482010-03-07 16:14:14 -0300341 /* The link is not enabled so we do not follow. */
342 if (!(link->flags & MEDIA_LNK_FL_ENABLED)) {
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300343 link_top(graph) = link_top(graph)->next;
Sakari Ailusa5ccc482010-03-07 16:14:14 -0300344 continue;
345 }
346
347 /* Get the entity in the other end of the link . */
348 next = media_entity_other(entity, link);
349
Laurent Pinchart5c7b25b2013-06-07 12:45:11 -0300350 /* Has the entity already been visited? */
Sakari Ailus29d8da02015-12-16 11:32:28 -0200351 if (media_entity_enum_test_and_set(&graph->ent_enum, next)) {
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300352 link_top(graph) = link_top(graph)->next;
Sakari Ailusa5ccc482010-03-07 16:14:14 -0300353 continue;
354 }
355
356 /* Push the new entity to stack and start over. */
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300357 link_top(graph) = link_top(graph)->next;
Sakari Ailusa5ccc482010-03-07 16:14:14 -0300358 stack_push(graph, next);
359 }
360
361 return stack_pop(graph);
362}
363EXPORT_SYMBOL_GPL(media_entity_graph_walk_next);
364
365/* -----------------------------------------------------------------------------
Laurent Pincharte02188c2010-08-25 09:00:41 -0300366 * Pipeline management
367 */
368
Shuah Khanfb49f202016-02-11 21:41:24 -0200369__must_check int __media_entity_pipeline_start(struct media_entity *entity,
370 struct media_pipeline *pipe)
Laurent Pincharte02188c2010-08-25 09:00:41 -0300371{
Javier Martinez Canillasd10c9892015-08-19 12:35:21 -0300372 struct media_device *mdev = entity->graph_obj.mdev;
Sakari Ailus5dd87752015-12-16 11:32:21 -0200373 struct media_entity_graph *graph = &pipe->graph;
Sakari Ailusaf88be32012-01-11 06:25:15 -0300374 struct media_entity *entity_err = entity;
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300375 struct media_link *link;
Sakari Ailusaf88be32012-01-11 06:25:15 -0300376 int ret;
Laurent Pincharte02188c2010-08-25 09:00:41 -0300377
Sakari Ailus74a41332015-12-16 11:32:29 -0200378 if (!pipe->streaming_count++) {
379 ret = media_entity_graph_walk_init(&pipe->graph, mdev);
380 if (ret)
381 goto error_graph_walk_start;
Sakari Ailus106b9902015-12-16 15:32:23 +0200382 }
383
384 media_entity_graph_walk_start(&pipe->graph, entity);
Laurent Pincharte02188c2010-08-25 09:00:41 -0300385
Sakari Ailus5dd87752015-12-16 11:32:21 -0200386 while ((entity = media_entity_graph_walk_next(graph))) {
Mauro Carvalho Chehabef69ee12015-10-01 18:07:53 -0300387 DECLARE_BITMAP(active, MEDIA_ENTITY_MAX_PADS);
388 DECLARE_BITMAP(has_no_links, MEDIA_ENTITY_MAX_PADS);
Sakari Ailusaf88be32012-01-11 06:25:15 -0300389
Laurent Pincharte02188c2010-08-25 09:00:41 -0300390 entity->stream_count++;
Sakari Ailus8aaf62b2015-11-29 17:20:02 -0200391
392 if (WARN_ON(entity->pipe && entity->pipe != pipe)) {
393 ret = -EBUSY;
394 goto error;
395 }
396
Laurent Pincharte02188c2010-08-25 09:00:41 -0300397 entity->pipe = pipe;
Sakari Ailusaf88be32012-01-11 06:25:15 -0300398
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
Sakari Ailusde49c282013-10-13 08:00:26 -0300406 bitmap_zero(active, entity->num_pads);
407 bitmap_fill(has_no_links, entity->num_pads);
408
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300409 list_for_each_entry(link, &entity->links, list) {
Sakari Ailusde49c282013-10-13 08:00:26 -0300410 struct media_pad *pad = link->sink->entity == entity
411 ? link->sink : link->source;
Sakari Ailusaf88be32012-01-11 06:25:15 -0300412
Sakari Ailusde49c282013-10-13 08:00:26 -0300413 /* Mark that a pad is connected by a link. */
414 bitmap_clear(has_no_links, pad->index, 1);
Sakari Ailusaf88be32012-01-11 06:25:15 -0300415
Sakari Ailusde49c282013-10-13 08:00:26 -0300416 /*
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))
Sakari Ailusaf88be32012-01-11 06:25:15 -0300431 continue;
432
433 ret = entity->ops->link_validate(link);
Sakari Ailusfab9d302014-10-28 20:35:04 -0300434 if (ret < 0 && ret != -ENOIOCTLCMD) {
Javier Martinez Canillasd10c9892015-08-19 12:35:21 -0300435 dev_dbg(entity->graph_obj.mdev->dev,
Sakari Ailusfab9d302014-10-28 20:35:04 -0300436 "link validation failed for \"%s\":%u -> \"%s\":%u, error %d\n",
Sakari Ailus823ea2a2015-02-12 11:43:11 -0200437 link->source->entity->name,
438 link->source->index,
439 entity->name, link->sink->index, ret);
Sakari Ailusaf88be32012-01-11 06:25:15 -0300440 goto error;
Sakari Ailusfab9d302014-10-28 20:35:04 -0300441 }
Sakari Ailusaf88be32012-01-11 06:25:15 -0300442 }
Sakari Ailusde49c282013-10-13 08:00:26 -0300443
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)) {
Helen Mae Koike Fornazier47dfdb32015-06-28 16:14:10 -0300448 ret = -ENOLINK;
Javier Martinez Canillasd10c9892015-08-19 12:35:21 -0300449 dev_dbg(entity->graph_obj.mdev->dev,
Sakari Ailusfab9d302014-10-28 20:35:04 -0300450 "\"%s\":%u must be connected by an enabled link\n",
451 entity->name,
Sakari Ailus094f1ca2014-11-03 17:55:51 -0300452 (unsigned)find_first_zero_bit(
453 active, entity->num_pads));
Sakari Ailusde49c282013-10-13 08:00:26 -0300454 goto error;
455 }
Laurent Pincharte02188c2010-08-25 09:00:41 -0300456 }
457
Sakari Ailusaf88be32012-01-11 06:25:15 -0300458 return 0;
459
460error:
461 /*
462 * Link validation on graph failed. We revert what we did and
463 * return the error.
464 */
Sakari Ailus5dd87752015-12-16 11:32:21 -0200465 media_entity_graph_walk_start(graph, entity_err);
Sakari Ailusaf88be32012-01-11 06:25:15 -0300466
Sakari Ailus5dd87752015-12-16 11:32:21 -0200467 while ((entity_err = media_entity_graph_walk_next(graph))) {
Shuah Khan3801bc72016-01-30 18:10:52 -0200468 /* 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 }
Sakari Ailusaf88be32012-01-11 06:25:15 -0300474
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
Sakari Ailus74a41332015-12-16 11:32:29 -0200483error_graph_walk_start:
484 if (!--pipe->streaming_count)
485 media_entity_graph_walk_cleanup(graph);
Sakari Ailus106b9902015-12-16 15:32:23 +0200486
Shuah Khanfb49f202016-02-11 21:41:24 -0200487 return ret;
488}
489EXPORT_SYMBOL_GPL(__media_entity_pipeline_start);
Sakari Ailusaf88be32012-01-11 06:25:15 -0300490
Shuah Khanfb49f202016-02-11 21:41:24 -0200491__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);
Sakari Ailusaf88be32012-01-11 06:25:15 -0300500 return ret;
Laurent Pincharte02188c2010-08-25 09:00:41 -0300501}
502EXPORT_SYMBOL_GPL(media_entity_pipeline_start);
503
Shuah Khanfb49f202016-02-11 21:41:24 -0200504void __media_entity_pipeline_stop(struct media_entity *entity)
Laurent Pincharte02188c2010-08-25 09:00:41 -0300505{
Sakari Ailus5dd87752015-12-16 11:32:21 -0200506 struct media_entity_graph *graph = &entity->pipe->graph;
Sakari Ailus74a41332015-12-16 11:32:29 -0200507 struct media_pipeline *pipe = entity->pipe;
Laurent Pincharte02188c2010-08-25 09:00:41 -0300508
Laurent Pincharte02188c2010-08-25 09:00:41 -0300509
Sakari Ailus74a41332015-12-16 11:32:29 -0200510 WARN_ON(!pipe->streaming_count);
Sakari Ailus5dd87752015-12-16 11:32:21 -0200511 media_entity_graph_walk_start(graph, entity);
Laurent Pincharte02188c2010-08-25 09:00:41 -0300512
Sakari Ailus5dd87752015-12-16 11:32:21 -0200513 while ((entity = media_entity_graph_walk_next(graph))) {
Shuah Khan3801bc72016-01-30 18:10:52 -0200514 /* 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 }
Laurent Pincharte02188c2010-08-25 09:00:41 -0300520 }
521
Sakari Ailus74a41332015-12-16 11:32:29 -0200522 if (!--pipe->streaming_count)
523 media_entity_graph_walk_cleanup(graph);
Sakari Ailus106b9902015-12-16 15:32:23 +0200524
Shuah Khanfb49f202016-02-11 21:41:24 -0200525}
526EXPORT_SYMBOL_GPL(__media_entity_pipeline_stop);
527
528void 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);
Laurent Pincharte02188c2010-08-25 09:00:41 -0300534 mutex_unlock(&mdev->graph_mutex);
535}
536EXPORT_SYMBOL_GPL(media_entity_pipeline_stop);
537
538/* -----------------------------------------------------------------------------
Laurent Pinchart503c3d822010-03-07 15:04:59 -0300539 * Module use count
540 */
541
Laurent Pinchart503c3d822010-03-07 15:04:59 -0300542struct media_entity *media_entity_get(struct media_entity *entity)
543{
544 if (entity == NULL)
545 return NULL;
546
Javier Martinez Canillasd10c9892015-08-19 12:35:21 -0300547 if (entity->graph_obj.mdev->dev &&
548 !try_module_get(entity->graph_obj.mdev->dev->driver->owner))
Laurent Pinchart503c3d822010-03-07 15:04:59 -0300549 return NULL;
550
551 return entity;
552}
553EXPORT_SYMBOL_GPL(media_entity_get);
554
Laurent Pinchart503c3d822010-03-07 15:04:59 -0300555void media_entity_put(struct media_entity *entity)
556{
557 if (entity == NULL)
558 return;
559
Javier Martinez Canillasd10c9892015-08-19 12:35:21 -0300560 if (entity->graph_obj.mdev->dev)
561 module_put(entity->graph_obj.mdev->dev->driver->owner);
Laurent Pinchart503c3d822010-03-07 15:04:59 -0300562}
563EXPORT_SYMBOL_GPL(media_entity_put);
564
565/* -----------------------------------------------------------------------------
Sakari Ailusa5ccc482010-03-07 16:14:14 -0300566 * Links management
567 */
568
Mauro Carvalho Chehab23615de2015-08-20 08:21:35 -0300569static struct media_link *media_add_link(struct list_head *head)
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300570{
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300571 struct media_link *link;
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300572
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300573 link = kzalloc(sizeof(*link), GFP_KERNEL);
574 if (link == NULL)
575 return NULL;
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300576
Mauro Carvalho Chehab23615de2015-08-20 08:21:35 -0300577 list_add_tail(&link->list, head);
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300578
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300579 return link;
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300580}
581
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300582static void __media_entity_remove_link(struct media_entity *entity,
Mauro Carvalho Chehab5abad222015-12-11 11:19:38 -0200583 struct media_link *link)
584{
585 struct media_link *rlink, *tmp;
586 struct media_entity *remote;
Mauro Carvalho Chehab5abad222015-12-11 11:19:38 -0200587
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) {
Mauro Carvalho Chehab58f69ee2015-12-11 11:25:23 -0200594 if (rlink != link->reverse)
Mauro Carvalho Chehab5abad222015-12-11 11:19:38 -0200595 continue;
Mauro Carvalho Chehab5abad222015-12-11 11:19:38 -0200596
597 if (link->source->entity == entity)
598 remote->num_backlinks--;
599
600 /* Remove the remote link */
601 list_del(&rlink->list);
Mauro Carvalho Chehabc350ef82015-12-11 11:55:40 -0200602 media_gobj_destroy(&rlink->graph_obj);
Mauro Carvalho Chehab5abad222015-12-11 11:19:38 -0200603 kfree(rlink);
604
605 if (--remote->num_links == 0)
606 break;
607 }
608 list_del(&link->list);
Mauro Carvalho Chehabc350ef82015-12-11 11:55:40 -0200609 media_gobj_destroy(&link->graph_obj);
Mauro Carvalho Chehab5abad222015-12-11 11:19:38 -0200610 kfree(link);
611}
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300612
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300613int
Mauro Carvalho Chehab8df00a12015-08-07 08:14:38 -0300614media_create_pad_link(struct media_entity *source, u16 source_pad,
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300615 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
Mauro Carvalho Chehab23615de2015-08-20 08:21:35 -0300624 link = media_add_link(&source->links);
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300625 if (link == NULL)
626 return -ENOMEM;
627
628 link->source = &source->pads[source_pad];
629 link->sink = &sink->pads[sink_pad];
Mauro Carvalho Chehab82ae2a52015-12-11 18:09:13 -0200630 link->flags = flags & ~MEDIA_LNK_FL_INTERFACE_LINK;
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300631
Mauro Carvalho Chehab6b6a4272015-08-14 12:54:36 -0300632 /* Initialize graph object embedded at the new link */
Mauro Carvalho Chehabc350ef82015-12-11 11:55:40 -0200633 media_gobj_create(source->graph_obj.mdev, MEDIA_GRAPH_LINK,
Javier Martinez Canillasd10c9892015-08-19 12:35:21 -0300634 &link->graph_obj);
Mauro Carvalho Chehab6b6a4272015-08-14 12:54:36 -0300635
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300636 /* Create the backlink. Backlinks are used to help graph traversal and
637 * are not reported to userspace.
638 */
Mauro Carvalho Chehab23615de2015-08-20 08:21:35 -0300639 backlink = media_add_link(&sink->links);
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300640 if (backlink == NULL) {
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300641 __media_entity_remove_link(source, link);
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300642 return -ENOMEM;
643 }
644
645 backlink->source = &source->pads[source_pad];
646 backlink->sink = &sink->pads[sink_pad];
647 backlink->flags = flags;
Mauro Carvalho Chehab39d1ebc62015-08-30 09:53:57 -0300648 backlink->is_backlink = true;
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300649
Mauro Carvalho Chehab6b6a4272015-08-14 12:54:36 -0300650 /* Initialize graph object embedded at the new link */
Mauro Carvalho Chehabc350ef82015-12-11 11:55:40 -0200651 media_gobj_create(sink->graph_obj.mdev, MEDIA_GRAPH_LINK,
Javier Martinez Canillasd10c9892015-08-19 12:35:21 -0300652 &backlink->graph_obj);
Mauro Carvalho Chehab6b6a4272015-08-14 12:54:36 -0300653
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300654 link->reverse = backlink;
655 backlink->reverse = link;
656
657 sink->num_backlinks++;
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300658 sink->num_links++;
659 source->num_links++;
Laurent Pinchart53e269c2009-12-09 08:40:00 -0300660
661 return 0;
662}
Mauro Carvalho Chehab8df00a12015-08-07 08:14:38 -0300663EXPORT_SYMBOL_GPL(media_create_pad_link);
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300664
Mauro Carvalho Chehabb01cc9c2015-12-30 09:45:48 -0200665int 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}
728EXPORT_SYMBOL_GPL(media_create_pad_links);
729
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300730void __media_entity_remove_links(struct media_entity *entity)
731{
732 struct media_link *link, *tmp;
733
734 list_for_each_entry_safe(link, tmp, &entity->links, list)
735 __media_entity_remove_link(entity, link);
Sylwester Nawrocki7349cec2013-05-09 08:29:32 -0300736
737 entity->num_links = 0;
738 entity->num_backlinks = 0;
739}
740EXPORT_SYMBOL_GPL(__media_entity_remove_links);
741
742void media_entity_remove_links(struct media_entity *entity)
743{
Mauro Carvalho Chehabcc4a8252015-12-15 08:01:13 -0200744 struct media_device *mdev = entity->graph_obj.mdev;
745
Sylwester Nawrocki7349cec2013-05-09 08:29:32 -0300746 /* Do nothing if the entity is not registered. */
Mauro Carvalho Chehabcc4a8252015-12-15 08:01:13 -0200747 if (mdev == NULL)
Sylwester Nawrocki7349cec2013-05-09 08:29:32 -0300748 return;
749
Mauro Carvalho Chehabe2c91d42016-04-06 10:55:24 -0300750 mutex_lock(&mdev->graph_mutex);
Sylwester Nawrocki7349cec2013-05-09 08:29:32 -0300751 __media_entity_remove_links(entity);
Mauro Carvalho Chehabe2c91d42016-04-06 10:55:24 -0300752 mutex_unlock(&mdev->graph_mutex);
Sylwester Nawrocki7349cec2013-05-09 08:29:32 -0300753}
754EXPORT_SYMBOL_GPL(media_entity_remove_links);
755
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300756static int __media_entity_setup_link_notify(struct media_link *link, u32 flags)
757{
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300758 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
Laurent Pinchart7a6f0b22011-03-11 11:34:35 -0300774 link->flags = flags;
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300775 link->reverse->flags = link->flags;
776
777 return 0;
778}
779
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300780int __media_entity_setup_link(struct media_link *link, u32 flags)
781{
Laurent Pinchart7a6f0b22011-03-11 11:34:35 -0300782 const u32 mask = MEDIA_LNK_FL_ENABLED;
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300783 struct media_device *mdev;
784 struct media_entity *source, *sink;
785 int ret = -EBUSY;
786
787 if (link == NULL)
788 return -EINVAL;
789
Laurent Pinchart7a6f0b22011-03-11 11:34:35 -0300790 /* The non-modifiable link flags must not be modified. */
791 if ((link->flags & ~mask) != (flags & ~mask))
792 return -EINVAL;
793
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300794 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
Laurent Pincharte02188c2010-08-25 09:00:41 -0300803 if (!(link->flags & MEDIA_LNK_FL_DYNAMIC) &&
804 (source->stream_count || sink->stream_count))
805 return -EBUSY;
806
Javier Martinez Canillasd10c9892015-08-19 12:35:21 -0300807 mdev = source->graph_obj.mdev;
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300808
Sylwester Nawrocki813f5c02013-05-31 10:37:26 -0300809 if (mdev->link_notify) {
810 ret = mdev->link_notify(link, flags,
811 MEDIA_DEV_NOTIFY_PRE_LINK_CH);
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300812 if (ret < 0)
813 return ret;
814 }
815
816 ret = __media_entity_setup_link_notify(link, flags);
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300817
Sylwester Nawrocki813f5c02013-05-31 10:37:26 -0300818 if (mdev->link_notify)
819 mdev->link_notify(link, flags, MEDIA_DEV_NOTIFY_POST_LINK_CH);
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300820
821 return ret;
822}
Shuah Khanefc70272016-02-11 21:41:23 -0200823EXPORT_SYMBOL_GPL(__media_entity_setup_link);
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300824
825int media_entity_setup_link(struct media_link *link, u32 flags)
826{
827 int ret;
828
Mauro Carvalho Chehab5c883ed2015-12-15 07:58:18 -0200829 mutex_lock(&link->graph_obj.mdev->graph_mutex);
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300830 ret = __media_entity_setup_link(link, flags);
Mauro Carvalho Chehab5c883ed2015-12-15 07:58:18 -0200831 mutex_unlock(&link->graph_obj.mdev->graph_mutex);
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300832
833 return ret;
834}
835EXPORT_SYMBOL_GPL(media_entity_setup_link);
836
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300837struct media_link *
838media_entity_find_link(struct media_pad *source, struct media_pad *sink)
839{
840 struct media_link *link;
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300841
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300842 list_for_each_entry(link, &source->entity->links, list) {
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300843 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}
852EXPORT_SYMBOL_GPL(media_entity_find_link);
853
Andrzej Hajda1bddf1b2013-06-03 05:16:13 -0300854struct media_pad *media_entity_remote_pad(struct media_pad *pad)
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300855{
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300856 struct media_link *link;
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300857
Mauro Carvalho Chehab57208e52015-08-07 06:55:40 -0300858 list_for_each_entry(link, &pad->entity->links, list) {
Laurent Pinchart97548ed2009-12-09 08:40:03 -0300859 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}
Andrzej Hajda1bddf1b2013-06-03 05:16:13 -0300872EXPORT_SYMBOL_GPL(media_entity_remote_pad);
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -0300873
Mauro Carvalho Chehab1283f842015-08-28 15:43:36 -0300874static 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
Mauro Carvalho Chehabc350ef82015-12-11 11:55:40 -0200883 media_gobj_create(mdev, gobj_type, &intf->graph_obj);
Mauro Carvalho Chehab1283f842015-08-28 15:43:36 -0300884}
885
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -0300886/* Functions related to the media interface via device nodes */
887
888struct media_intf_devnode *media_devnode_create(struct media_device *mdev,
889 u32 type, u32 flags,
Mauro Carvalho Chehab0b3b72df92015-09-09 08:19:25 -0300890 u32 major, u32 minor)
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -0300891{
892 struct media_intf_devnode *devnode;
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -0300893
Mauro Carvalho Chehab0b3b72df92015-09-09 08:19:25 -0300894 devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -0300895 if (!devnode)
896 return NULL;
897
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -0300898 devnode->major = major;
899 devnode->minor = minor;
900
Mauro Carvalho Chehab1283f842015-08-28 15:43:36 -0300901 media_interface_init(mdev, &devnode->intf, MEDIA_GRAPH_INTF_DEVNODE,
902 type, flags);
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -0300903
904 return devnode;
905}
906EXPORT_SYMBOL_GPL(media_devnode_create);
907
908void media_devnode_remove(struct media_intf_devnode *devnode)
909{
Mauro Carvalho Chehab7c4696a2015-08-24 08:46:46 -0300910 media_remove_intf_links(&devnode->intf);
Mauro Carvalho Chehabc350ef82015-12-11 11:55:40 -0200911 media_gobj_destroy(&devnode->intf.graph_obj);
Mauro Carvalho Chehab27e543f2015-08-20 09:07:34 -0300912 kfree(devnode);
913}
914EXPORT_SYMBOL_GPL(media_devnode_remove);
Mauro Carvalho Chehab86e26622015-08-07 10:36:25 -0300915
916struct 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;
Mauro Carvalho Chehab82ae2a52015-12-11 18:09:13 -0200928 link->flags = flags | MEDIA_LNK_FL_INTERFACE_LINK;
Mauro Carvalho Chehab86e26622015-08-07 10:36:25 -0300929
930 /* Initialize graph object embedded at the new link */
Mauro Carvalho Chehabc350ef82015-12-11 11:55:40 -0200931 media_gobj_create(intf->graph_obj.mdev, MEDIA_GRAPH_LINK,
Mauro Carvalho Chehab86e26622015-08-07 10:36:25 -0300932 &link->graph_obj);
933
934 return link;
935}
936EXPORT_SYMBOL_GPL(media_create_intf_link);
937
Mauro Carvalho Chehabd47109f2015-08-29 21:23:44 -0300938void __media_remove_intf_link(struct media_link *link)
Mauro Carvalho Chehab86e26622015-08-07 10:36:25 -0300939{
Mauro Carvalho Chehabd47109f2015-08-29 21:23:44 -0300940 list_del(&link->list);
Mauro Carvalho Chehabc350ef82015-12-11 11:55:40 -0200941 media_gobj_destroy(&link->graph_obj);
Mauro Carvalho Chehab86e26622015-08-07 10:36:25 -0300942 kfree(link);
943}
Mauro Carvalho Chehabd47109f2015-08-29 21:23:44 -0300944EXPORT_SYMBOL_GPL(__media_remove_intf_link);
Mauro Carvalho Chehab86e26622015-08-07 10:36:25 -0300945
946void media_remove_intf_link(struct media_link *link)
947{
Mauro Carvalho Chehabcc4a8252015-12-15 08:01:13 -0200948 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
Mauro Carvalho Chehabe2c91d42016-04-06 10:55:24 -0300954 mutex_lock(&mdev->graph_mutex);
Mauro Carvalho Chehab86e26622015-08-07 10:36:25 -0300955 __media_remove_intf_link(link);
Mauro Carvalho Chehabe2c91d42016-04-06 10:55:24 -0300956 mutex_unlock(&mdev->graph_mutex);
Mauro Carvalho Chehab86e26622015-08-07 10:36:25 -0300957}
958EXPORT_SYMBOL_GPL(media_remove_intf_link);
Mauro Carvalho Chehab7c4696a2015-08-24 08:46:46 -0300959
960void __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}
968EXPORT_SYMBOL_GPL(__media_remove_intf_links);
969
970void media_remove_intf_links(struct media_interface *intf)
971{
Mauro Carvalho Chehabcc4a8252015-12-15 08:01:13 -0200972 struct media_device *mdev = intf->graph_obj.mdev;
973
Mauro Carvalho Chehab7c4696a2015-08-24 08:46:46 -0300974 /* Do nothing if the intf is not registered. */
Mauro Carvalho Chehabcc4a8252015-12-15 08:01:13 -0200975 if (mdev == NULL)
Mauro Carvalho Chehab7c4696a2015-08-24 08:46:46 -0300976 return;
977
Mauro Carvalho Chehabe2c91d42016-04-06 10:55:24 -0300978 mutex_lock(&mdev->graph_mutex);
Mauro Carvalho Chehab7c4696a2015-08-24 08:46:46 -0300979 __media_remove_intf_links(intf);
Mauro Carvalho Chehabe2c91d42016-04-06 10:55:24 -0300980 mutex_unlock(&mdev->graph_mutex);
Mauro Carvalho Chehab7c4696a2015-08-24 08:46:46 -0300981}
982EXPORT_SYMBOL_GPL(media_remove_intf_links);