xref: /linux/drivers/media/v4l2-core/v4l2-mc.c (revision 79790b6818e96c58fe2bffee1b418c16e64e7b80)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 
3 /*
4  * Media Controller ancillary functions
5  *
6  * Copyright (c) 2016 Mauro Carvalho Chehab <mchehab@kernel.org>
7  * Copyright (C) 2016 Shuah Khan <shuahkh@osg.samsung.com>
8  * Copyright (C) 2006-2010 Nokia Corporation
9  * Copyright (c) 2016 Intel Corporation.
10  */
11 
12 #include <linux/module.h>
13 #include <linux/pci.h>
14 #include <linux/usb.h>
15 #include <media/media-device.h>
16 #include <media/media-entity.h>
17 #include <media/v4l2-fh.h>
18 #include <media/v4l2-mc.h>
19 #include <media/v4l2-subdev.h>
20 #include <media/videobuf2-core.h>
21 
v4l2_mc_create_media_graph(struct media_device * mdev)22 int v4l2_mc_create_media_graph(struct media_device *mdev)
23 
24 {
25 	struct media_entity *entity;
26 	struct media_entity *if_vid = NULL, *if_aud = NULL;
27 	struct media_entity *tuner = NULL, *decoder = NULL;
28 	struct media_entity *io_v4l = NULL, *io_vbi = NULL, *io_swradio = NULL;
29 	bool is_webcam = false;
30 	u32 flags;
31 	int ret, pad_sink, pad_source;
32 
33 	if (!mdev)
34 		return 0;
35 
36 	media_device_for_each_entity(entity, mdev) {
37 		switch (entity->function) {
38 		case MEDIA_ENT_F_IF_VID_DECODER:
39 			if_vid = entity;
40 			break;
41 		case MEDIA_ENT_F_IF_AUD_DECODER:
42 			if_aud = entity;
43 			break;
44 		case MEDIA_ENT_F_TUNER:
45 			tuner = entity;
46 			break;
47 		case MEDIA_ENT_F_ATV_DECODER:
48 			decoder = entity;
49 			break;
50 		case MEDIA_ENT_F_IO_V4L:
51 			io_v4l = entity;
52 			break;
53 		case MEDIA_ENT_F_IO_VBI:
54 			io_vbi = entity;
55 			break;
56 		case MEDIA_ENT_F_IO_SWRADIO:
57 			io_swradio = entity;
58 			break;
59 		case MEDIA_ENT_F_CAM_SENSOR:
60 			is_webcam = true;
61 			break;
62 		}
63 	}
64 
65 	/* It should have at least one I/O entity */
66 	if (!io_v4l && !io_vbi && !io_swradio) {
67 		dev_warn(mdev->dev, "Didn't find any I/O entity\n");
68 		return -EINVAL;
69 	}
70 
71 	/*
72 	 * Here, webcams are modelled on a very simple way: the sensor is
73 	 * connected directly to the I/O entity. All dirty details, like
74 	 * scaler and crop HW are hidden. While such mapping is not enough
75 	 * for mc-centric hardware, it is enough for v4l2 interface centric
76 	 * PC-consumer's hardware.
77 	 */
78 	if (is_webcam) {
79 		if (!io_v4l) {
80 			dev_warn(mdev->dev, "Didn't find a MEDIA_ENT_F_IO_V4L\n");
81 			return -EINVAL;
82 		}
83 
84 		media_device_for_each_entity(entity, mdev) {
85 			if (entity->function != MEDIA_ENT_F_CAM_SENSOR)
86 				continue;
87 			ret = media_create_pad_link(entity, 0,
88 						    io_v4l, 0,
89 						    MEDIA_LNK_FL_ENABLED);
90 			if (ret) {
91 				dev_warn(mdev->dev, "Failed to create a sensor link\n");
92 				return ret;
93 			}
94 		}
95 		if (!decoder)
96 			return 0;
97 	}
98 
99 	/* The device isn't a webcam. So, it should have a decoder */
100 	if (!decoder) {
101 		dev_warn(mdev->dev, "Decoder not found\n");
102 		return -EINVAL;
103 	}
104 
105 	/* Link the tuner and IF video output pads */
106 	if (tuner) {
107 		if (if_vid) {
108 			pad_source = media_get_pad_index(tuner,
109 							 MEDIA_PAD_FL_SOURCE,
110 							 PAD_SIGNAL_ANALOG);
111 			pad_sink = media_get_pad_index(if_vid,
112 						       MEDIA_PAD_FL_SINK,
113 						       PAD_SIGNAL_ANALOG);
114 			if (pad_source < 0 || pad_sink < 0) {
115 				dev_warn(mdev->dev, "Couldn't get tuner and/or PLL pad(s): (%d, %d)\n",
116 					 pad_source, pad_sink);
117 				return -EINVAL;
118 			}
119 			ret = media_create_pad_link(tuner, pad_source,
120 						    if_vid, pad_sink,
121 						    MEDIA_LNK_FL_ENABLED);
122 			if (ret) {
123 				dev_warn(mdev->dev, "Couldn't create tuner->PLL link)\n");
124 				return ret;
125 			}
126 
127 			pad_source = media_get_pad_index(if_vid,
128 							 MEDIA_PAD_FL_SOURCE,
129 							 PAD_SIGNAL_ANALOG);
130 			pad_sink = media_get_pad_index(decoder,
131 						       MEDIA_PAD_FL_SINK,
132 						       PAD_SIGNAL_ANALOG);
133 			if (pad_source < 0 || pad_sink < 0) {
134 				dev_warn(mdev->dev, "get decoder and/or PLL pad(s): (%d, %d)\n",
135 					 pad_source, pad_sink);
136 				return -EINVAL;
137 			}
138 			ret = media_create_pad_link(if_vid, pad_source,
139 						    decoder, pad_sink,
140 						    MEDIA_LNK_FL_ENABLED);
141 			if (ret) {
142 				dev_warn(mdev->dev, "couldn't link PLL to decoder\n");
143 				return ret;
144 			}
145 		} else {
146 			pad_source = media_get_pad_index(tuner,
147 							 MEDIA_PAD_FL_SOURCE,
148 							 PAD_SIGNAL_ANALOG);
149 			pad_sink = media_get_pad_index(decoder,
150 						       MEDIA_PAD_FL_SINK,
151 						       PAD_SIGNAL_ANALOG);
152 			if (pad_source < 0 || pad_sink < 0) {
153 				dev_warn(mdev->dev, "couldn't get tuner and/or decoder pad(s): (%d, %d)\n",
154 					 pad_source, pad_sink);
155 				return -EINVAL;
156 			}
157 			ret = media_create_pad_link(tuner, pad_source,
158 						    decoder, pad_sink,
159 						    MEDIA_LNK_FL_ENABLED);
160 			if (ret)
161 				return ret;
162 		}
163 
164 		if (if_aud) {
165 			pad_source = media_get_pad_index(tuner,
166 							 MEDIA_PAD_FL_SOURCE,
167 							 PAD_SIGNAL_AUDIO);
168 			pad_sink = media_get_pad_index(if_aud,
169 						       MEDIA_PAD_FL_SINK,
170 						       PAD_SIGNAL_AUDIO);
171 			if (pad_source < 0 || pad_sink < 0) {
172 				dev_warn(mdev->dev, "couldn't get tuner and/or decoder pad(s) for audio: (%d, %d)\n",
173 					 pad_source, pad_sink);
174 				return -EINVAL;
175 			}
176 			ret = media_create_pad_link(tuner, pad_source,
177 						    if_aud, pad_sink,
178 						    MEDIA_LNK_FL_ENABLED);
179 			if (ret) {
180 				dev_warn(mdev->dev, "couldn't link tuner->audio PLL\n");
181 				return ret;
182 			}
183 		} else {
184 			if_aud = tuner;
185 		}
186 
187 	}
188 
189 	/* Create demod to V4L, VBI and SDR radio links */
190 	if (io_v4l) {
191 		pad_source = media_get_pad_index(decoder, MEDIA_PAD_FL_SOURCE,
192 						 PAD_SIGNAL_DV);
193 		if (pad_source < 0) {
194 			dev_warn(mdev->dev, "couldn't get decoder output pad for V4L I/O\n");
195 			return -EINVAL;
196 		}
197 		ret = media_create_pad_link(decoder, pad_source,
198 					    io_v4l, 0,
199 					    MEDIA_LNK_FL_ENABLED);
200 		if (ret) {
201 			dev_warn(mdev->dev, "couldn't link decoder output to V4L I/O\n");
202 			return ret;
203 		}
204 	}
205 
206 	if (io_swradio) {
207 		pad_source = media_get_pad_index(decoder, MEDIA_PAD_FL_SOURCE,
208 						 PAD_SIGNAL_DV);
209 		if (pad_source < 0) {
210 			dev_warn(mdev->dev, "couldn't get decoder output pad for SDR\n");
211 			return -EINVAL;
212 		}
213 		ret = media_create_pad_link(decoder, pad_source,
214 					    io_swradio, 0,
215 					    MEDIA_LNK_FL_ENABLED);
216 		if (ret) {
217 			dev_warn(mdev->dev, "couldn't link decoder output to SDR\n");
218 			return ret;
219 		}
220 	}
221 
222 	if (io_vbi) {
223 		pad_source = media_get_pad_index(decoder, MEDIA_PAD_FL_SOURCE,
224 						 PAD_SIGNAL_DV);
225 		if (pad_source < 0) {
226 			dev_warn(mdev->dev, "couldn't get decoder output pad for VBI\n");
227 			return -EINVAL;
228 		}
229 		ret = media_create_pad_link(decoder, pad_source,
230 					    io_vbi, 0,
231 					    MEDIA_LNK_FL_ENABLED);
232 		if (ret) {
233 			dev_warn(mdev->dev, "couldn't link decoder output to VBI\n");
234 			return ret;
235 		}
236 	}
237 
238 	/* Create links for the media connectors */
239 	flags = MEDIA_LNK_FL_ENABLED;
240 	media_device_for_each_entity(entity, mdev) {
241 		switch (entity->function) {
242 		case MEDIA_ENT_F_CONN_RF:
243 			if (!tuner)
244 				continue;
245 			pad_sink = media_get_pad_index(tuner, MEDIA_PAD_FL_SINK,
246 						       PAD_SIGNAL_ANALOG);
247 			if (pad_sink < 0) {
248 				dev_warn(mdev->dev, "couldn't get tuner analog pad sink\n");
249 				return -EINVAL;
250 			}
251 			ret = media_create_pad_link(entity, 0, tuner,
252 						    pad_sink,
253 						    flags);
254 			break;
255 		case MEDIA_ENT_F_CONN_SVIDEO:
256 		case MEDIA_ENT_F_CONN_COMPOSITE:
257 			pad_sink = media_get_pad_index(decoder,
258 						       MEDIA_PAD_FL_SINK,
259 						       PAD_SIGNAL_ANALOG);
260 			if (pad_sink < 0) {
261 				dev_warn(mdev->dev, "couldn't get decoder analog pad sink\n");
262 				return -EINVAL;
263 			}
264 			ret = media_create_pad_link(entity, 0, decoder,
265 						    pad_sink,
266 						    flags);
267 			break;
268 		default:
269 			continue;
270 		}
271 		if (ret)
272 			return ret;
273 
274 		flags = 0;
275 	}
276 
277 	return 0;
278 }
279 EXPORT_SYMBOL_GPL(v4l2_mc_create_media_graph);
280 
v4l_enable_media_source(struct video_device * vdev)281 int v4l_enable_media_source(struct video_device *vdev)
282 {
283 	struct media_device *mdev = vdev->entity.graph_obj.mdev;
284 	int ret = 0, err;
285 
286 	if (!mdev)
287 		return 0;
288 
289 	mutex_lock(&mdev->graph_mutex);
290 	if (!mdev->enable_source)
291 		goto end;
292 	err = mdev->enable_source(&vdev->entity, &vdev->pipe);
293 	if (err)
294 		ret = -EBUSY;
295 end:
296 	mutex_unlock(&mdev->graph_mutex);
297 	return ret;
298 }
299 EXPORT_SYMBOL_GPL(v4l_enable_media_source);
300 
v4l_disable_media_source(struct video_device * vdev)301 void v4l_disable_media_source(struct video_device *vdev)
302 {
303 	struct media_device *mdev = vdev->entity.graph_obj.mdev;
304 
305 	if (mdev) {
306 		mutex_lock(&mdev->graph_mutex);
307 		if (mdev->disable_source)
308 			mdev->disable_source(&vdev->entity);
309 		mutex_unlock(&mdev->graph_mutex);
310 	}
311 }
312 EXPORT_SYMBOL_GPL(v4l_disable_media_source);
313 
v4l_vb2q_enable_media_source(struct vb2_queue * q)314 int v4l_vb2q_enable_media_source(struct vb2_queue *q)
315 {
316 	struct v4l2_fh *fh = q->owner;
317 
318 	if (fh && fh->vdev)
319 		return v4l_enable_media_source(fh->vdev);
320 	return 0;
321 }
322 EXPORT_SYMBOL_GPL(v4l_vb2q_enable_media_source);
323 
v4l2_create_fwnode_links_to_pad(struct v4l2_subdev * src_sd,struct media_pad * sink,u32 flags)324 int v4l2_create_fwnode_links_to_pad(struct v4l2_subdev *src_sd,
325 				    struct media_pad *sink, u32 flags)
326 {
327 	struct fwnode_handle *endpoint;
328 
329 	if (!(sink->flags & MEDIA_PAD_FL_SINK))
330 		return -EINVAL;
331 
332 	fwnode_graph_for_each_endpoint(dev_fwnode(src_sd->dev), endpoint) {
333 		struct fwnode_handle *remote_ep;
334 		int src_idx, sink_idx, ret;
335 		struct media_pad *src;
336 
337 		src_idx = media_entity_get_fwnode_pad(&src_sd->entity,
338 						      endpoint,
339 						      MEDIA_PAD_FL_SOURCE);
340 		if (src_idx < 0) {
341 			dev_dbg(src_sd->dev, "no source pad found for %pfw\n",
342 				endpoint);
343 			continue;
344 		}
345 
346 		remote_ep = fwnode_graph_get_remote_endpoint(endpoint);
347 		if (!remote_ep) {
348 			dev_dbg(src_sd->dev, "no remote ep found for %pfw\n",
349 				endpoint);
350 			continue;
351 		}
352 
353 		/*
354 		 * ask the sink to verify it owns the remote endpoint,
355 		 * and translate to a sink pad.
356 		 */
357 		sink_idx = media_entity_get_fwnode_pad(sink->entity,
358 						       remote_ep,
359 						       MEDIA_PAD_FL_SINK);
360 		fwnode_handle_put(remote_ep);
361 
362 		if (sink_idx < 0 || sink_idx != sink->index) {
363 			dev_dbg(src_sd->dev,
364 				"sink pad index mismatch or error (is %d, expected %u)\n",
365 				sink_idx, sink->index);
366 			continue;
367 		}
368 
369 		/*
370 		 * the source endpoint corresponds to one of its source pads,
371 		 * the source endpoint connects to an endpoint at the sink
372 		 * entity, and the sink endpoint corresponds to the sink
373 		 * pad requested, so we have found an endpoint connection
374 		 * that works, create the media link for it.
375 		 */
376 
377 		src = &src_sd->entity.pads[src_idx];
378 
379 		/* skip if link already exists */
380 		if (media_entity_find_link(src, sink)) {
381 			dev_dbg(src_sd->dev,
382 				"link %s:%d -> %s:%d already exists\n",
383 				src_sd->entity.name, src_idx,
384 				sink->entity->name, sink_idx);
385 			continue;
386 		}
387 
388 		dev_dbg(src_sd->dev, "creating link %s:%d -> %s:%d\n",
389 			src_sd->entity.name, src_idx,
390 			sink->entity->name, sink_idx);
391 
392 		ret = media_create_pad_link(&src_sd->entity, src_idx,
393 					    sink->entity, sink_idx, flags);
394 		if (ret) {
395 			dev_err(src_sd->dev,
396 				"link %s:%d -> %s:%d failed with %d\n",
397 				src_sd->entity.name, src_idx,
398 				sink->entity->name, sink_idx, ret);
399 
400 			fwnode_handle_put(endpoint);
401 			return ret;
402 		}
403 	}
404 
405 	return 0;
406 }
407 EXPORT_SYMBOL_GPL(v4l2_create_fwnode_links_to_pad);
408 
v4l2_create_fwnode_links(struct v4l2_subdev * src_sd,struct v4l2_subdev * sink_sd)409 int v4l2_create_fwnode_links(struct v4l2_subdev *src_sd,
410 			     struct v4l2_subdev *sink_sd)
411 {
412 	unsigned int i;
413 
414 	for (i = 0; i < sink_sd->entity.num_pads; i++) {
415 		struct media_pad *pad = &sink_sd->entity.pads[i];
416 		int ret;
417 
418 		if (!(pad->flags & MEDIA_PAD_FL_SINK))
419 			continue;
420 
421 		ret = v4l2_create_fwnode_links_to_pad(src_sd, pad, 0);
422 		if (ret)
423 			return ret;
424 	}
425 
426 	return 0;
427 }
428 EXPORT_SYMBOL_GPL(v4l2_create_fwnode_links);
429 
430 /* -----------------------------------------------------------------------------
431  * Pipeline power management
432  *
433  * Entities must be powered up when part of a pipeline that contains at least
434  * one open video device node.
435  *
436  * To achieve this use the entity use_count field to track the number of users.
437  * For entities corresponding to video device nodes the use_count field stores
438  * the users count of the node. For entities corresponding to subdevs the
439  * use_count field stores the total number of users of all video device nodes
440  * in the pipeline.
441  *
442  * The v4l2_pipeline_pm_{get, put}() functions must be called in the open() and
443  * close() handlers of video device nodes. It increments or decrements the use
444  * count of all subdev entities in the pipeline.
445  *
446  * To react to link management on powered pipelines, the link setup notification
447  * callback updates the use count of all entities in the source and sink sides
448  * of the link.
449  */
450 
451 /*
452  * pipeline_pm_use_count - Count the number of users of a pipeline
453  * @entity: The entity
454  *
455  * Return the total number of users of all video device nodes in the pipeline.
456  */
pipeline_pm_use_count(struct media_entity * entity,struct media_graph * graph)457 static int pipeline_pm_use_count(struct media_entity *entity,
458 	struct media_graph *graph)
459 {
460 	int use = 0;
461 
462 	media_graph_walk_start(graph, entity);
463 
464 	while ((entity = media_graph_walk_next(graph))) {
465 		if (is_media_entity_v4l2_video_device(entity))
466 			use += entity->use_count;
467 	}
468 
469 	return use;
470 }
471 
472 /*
473  * pipeline_pm_power_one - Apply power change to an entity
474  * @entity: The entity
475  * @change: Use count change
476  *
477  * Change the entity use count by @change. If the entity is a subdev update its
478  * power state by calling the core::s_power operation when the use count goes
479  * from 0 to != 0 or from != 0 to 0.
480  *
481  * Return 0 on success or a negative error code on failure.
482  */
pipeline_pm_power_one(struct media_entity * entity,int change)483 static int pipeline_pm_power_one(struct media_entity *entity, int change)
484 {
485 	struct v4l2_subdev *subdev;
486 	int ret;
487 
488 	subdev = is_media_entity_v4l2_subdev(entity)
489 	       ? media_entity_to_v4l2_subdev(entity) : NULL;
490 
491 	if (entity->use_count == 0 && change > 0 && subdev != NULL) {
492 		ret = v4l2_subdev_call(subdev, core, s_power, 1);
493 		if (ret < 0 && ret != -ENOIOCTLCMD)
494 			return ret;
495 	}
496 
497 	entity->use_count += change;
498 	WARN_ON(entity->use_count < 0);
499 
500 	if (entity->use_count == 0 && change < 0 && subdev != NULL)
501 		v4l2_subdev_call(subdev, core, s_power, 0);
502 
503 	return 0;
504 }
505 
506 /*
507  * pipeline_pm_power - Apply power change to all entities in a pipeline
508  * @entity: The entity
509  * @change: Use count change
510  *
511  * Walk the pipeline to update the use count and the power state of all non-node
512  * entities.
513  *
514  * Return 0 on success or a negative error code on failure.
515  */
pipeline_pm_power(struct media_entity * entity,int change,struct media_graph * graph)516 static int pipeline_pm_power(struct media_entity *entity, int change,
517 	struct media_graph *graph)
518 {
519 	struct media_entity *first = entity;
520 	int ret = 0;
521 
522 	if (!change)
523 		return 0;
524 
525 	media_graph_walk_start(graph, entity);
526 
527 	while (!ret && (entity = media_graph_walk_next(graph)))
528 		if (is_media_entity_v4l2_subdev(entity))
529 			ret = pipeline_pm_power_one(entity, change);
530 
531 	if (!ret)
532 		return ret;
533 
534 	media_graph_walk_start(graph, first);
535 
536 	while ((first = media_graph_walk_next(graph))
537 	       && first != entity)
538 		if (is_media_entity_v4l2_subdev(first))
539 			pipeline_pm_power_one(first, -change);
540 
541 	return ret;
542 }
543 
v4l2_pipeline_pm_use(struct media_entity * entity,unsigned int use)544 static int v4l2_pipeline_pm_use(struct media_entity *entity, unsigned int use)
545 {
546 	struct media_device *mdev = entity->graph_obj.mdev;
547 	int change = use ? 1 : -1;
548 	int ret;
549 
550 	mutex_lock(&mdev->graph_mutex);
551 
552 	/* Apply use count to node. */
553 	entity->use_count += change;
554 	WARN_ON(entity->use_count < 0);
555 
556 	/* Apply power change to connected non-nodes. */
557 	ret = pipeline_pm_power(entity, change, &mdev->pm_count_walk);
558 	if (ret < 0)
559 		entity->use_count -= change;
560 
561 	mutex_unlock(&mdev->graph_mutex);
562 
563 	return ret;
564 }
565 
v4l2_pipeline_pm_get(struct media_entity * entity)566 int v4l2_pipeline_pm_get(struct media_entity *entity)
567 {
568 	return v4l2_pipeline_pm_use(entity, 1);
569 }
570 EXPORT_SYMBOL_GPL(v4l2_pipeline_pm_get);
571 
v4l2_pipeline_pm_put(struct media_entity * entity)572 void v4l2_pipeline_pm_put(struct media_entity *entity)
573 {
574 	/* Powering off entities shouldn't fail. */
575 	WARN_ON(v4l2_pipeline_pm_use(entity, 0));
576 }
577 EXPORT_SYMBOL_GPL(v4l2_pipeline_pm_put);
578 
v4l2_pipeline_link_notify(struct media_link * link,u32 flags,unsigned int notification)579 int v4l2_pipeline_link_notify(struct media_link *link, u32 flags,
580 			      unsigned int notification)
581 {
582 	struct media_graph *graph = &link->graph_obj.mdev->pm_count_walk;
583 	struct media_entity *source = link->source->entity;
584 	struct media_entity *sink = link->sink->entity;
585 	int source_use;
586 	int sink_use;
587 	int ret = 0;
588 
589 	source_use = pipeline_pm_use_count(source, graph);
590 	sink_use = pipeline_pm_use_count(sink, graph);
591 
592 	if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
593 	    !(flags & MEDIA_LNK_FL_ENABLED)) {
594 		/* Powering off entities is assumed to never fail. */
595 		pipeline_pm_power(source, -sink_use, graph);
596 		pipeline_pm_power(sink, -source_use, graph);
597 		return 0;
598 	}
599 
600 	if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH &&
601 		(flags & MEDIA_LNK_FL_ENABLED)) {
602 
603 		ret = pipeline_pm_power(source, sink_use, graph);
604 		if (ret < 0)
605 			return ret;
606 
607 		ret = pipeline_pm_power(sink, source_use, graph);
608 		if (ret < 0)
609 			pipeline_pm_power(source, -sink_use, graph);
610 	}
611 
612 	return ret;
613 }
614 EXPORT_SYMBOL_GPL(v4l2_pipeline_link_notify);
615