1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // ASoC audio graph sound card support
4 //
5 // Copyright (C) 2016 Renesas Solutions Corp.
6 // Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
7 //
8 // based on ${LINUX}/sound/soc/generic/simple-card.c
9 
10 #include <linux/clk.h>
11 #include <linux/device.h>
12 #include <linux/gpio.h>
13 #include <linux/gpio/consumer.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/of_device.h>
17 #include <linux/of_gpio.h>
18 #include <linux/of_graph.h>
19 #include <linux/platform_device.h>
20 #include <linux/string.h>
21 #include <sound/graph_card.h>
22 
23 #define DPCM_SELECTABLE 1
24 
25 static int graph_outdrv_event(struct snd_soc_dapm_widget *w,
26 			      struct snd_kcontrol *kcontrol,
27 			      int event)
28 {
29 	struct snd_soc_dapm_context *dapm = w->dapm;
30 	struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(dapm->card);
31 
32 	switch (event) {
33 	case SND_SOC_DAPM_POST_PMU:
34 		gpiod_set_value_cansleep(priv->pa_gpio, 1);
35 		break;
36 	case SND_SOC_DAPM_PRE_PMD:
37 		gpiod_set_value_cansleep(priv->pa_gpio, 0);
38 		break;
39 	default:
40 		return -EINVAL;
41 	}
42 
43 	return 0;
44 }
45 
46 static const struct snd_soc_dapm_widget graph_dapm_widgets[] = {
47 	SND_SOC_DAPM_OUT_DRV_E("Amplifier", SND_SOC_NOPM,
48 			       0, 0, NULL, 0, graph_outdrv_event,
49 			       SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
50 };
51 
52 static const struct snd_soc_ops graph_ops = {
53 	.startup	= asoc_simple_startup,
54 	.shutdown	= asoc_simple_shutdown,
55 	.hw_params	= asoc_simple_hw_params,
56 };
57 
58 static int graph_get_dai_id(struct device_node *ep)
59 {
60 	struct device_node *node;
61 	struct device_node *endpoint;
62 	struct of_endpoint info;
63 	int i, id;
64 	const u32 *reg;
65 	int ret;
66 
67 	/* use driver specified DAI ID if exist */
68 	ret = snd_soc_get_dai_id(ep);
69 	if (ret != -ENOTSUPP)
70 		return ret;
71 
72 	/* use endpoint/port reg if exist */
73 	ret = of_graph_parse_endpoint(ep, &info);
74 	if (ret == 0) {
75 		/*
76 		 * Because it will count port/endpoint if it doesn't have "reg".
77 		 * But, we can't judge whether it has "no reg", or "reg = <0>"
78 		 * only of_graph_parse_endpoint().
79 		 * We need to check "reg" property
80 		 */
81 		if (of_get_property(ep,   "reg", NULL))
82 			return info.id;
83 
84 		node = of_get_parent(ep);
85 		reg = of_get_property(node, "reg", NULL);
86 		of_node_put(node);
87 		if (reg)
88 			return info.port;
89 	}
90 	node = of_graph_get_port_parent(ep);
91 
92 	/*
93 	 * Non HDMI sound case, counting port/endpoint on its DT
94 	 * is enough. Let's count it.
95 	 */
96 	i = 0;
97 	id = -1;
98 	for_each_endpoint_of_node(node, endpoint) {
99 		if (endpoint == ep)
100 			id = i;
101 		i++;
102 	}
103 
104 	of_node_put(node);
105 
106 	if (id < 0)
107 		return -ENODEV;
108 
109 	return id;
110 }
111 
112 static bool soc_component_is_pcm(struct snd_soc_dai_link_component *dlc)
113 {
114 	struct snd_soc_dai *dai = snd_soc_find_dai_with_mutex(dlc);
115 
116 	if (dai && (dai->component->driver->pcm_construct ||
117 		    dai->driver->pcm_new))
118 		return true;
119 
120 	return false;
121 }
122 
123 static int asoc_simple_parse_dai(struct device_node *ep,
124 				 struct snd_soc_dai_link_component *dlc,
125 				 int *is_single_link)
126 {
127 	struct device_node *node;
128 	struct of_phandle_args args;
129 	int ret;
130 
131 	if (!ep)
132 		return 0;
133 
134 	node = of_graph_get_port_parent(ep);
135 
136 	/* Get dai->name */
137 	args.np		= node;
138 	args.args[0]	= graph_get_dai_id(ep);
139 	args.args_count	= (of_graph_get_endpoint_count(node) > 1);
140 
141 	/*
142 	 * FIXME
143 	 *
144 	 * Here, dlc->dai_name is pointer to CPU/Codec DAI name.
145 	 * If user unbinded CPU or Codec driver, but not for Sound Card,
146 	 * dlc->dai_name is keeping unbinded CPU or Codec
147 	 * driver's pointer.
148 	 *
149 	 * If user re-bind CPU or Codec driver again, ALSA SoC will try
150 	 * to rebind Card via snd_soc_try_rebind_card(), but because of
151 	 * above reason, it might can't bind Sound Card.
152 	 * Because Sound Card is pointing to released dai_name pointer.
153 	 *
154 	 * To avoid this rebind Card issue,
155 	 * 1) It needs to alloc memory to keep dai_name eventhough
156 	 *    CPU or Codec driver was unbinded, or
157 	 * 2) user need to rebind Sound Card everytime
158 	 *    if he unbinded CPU or Codec.
159 	 */
160 	ret = snd_soc_get_dai_name(&args, &dlc->dai_name);
161 	if (ret < 0) {
162 		of_node_put(node);
163 		return ret;
164 	}
165 
166 	dlc->of_node = node;
167 
168 	if (is_single_link)
169 		*is_single_link = of_graph_get_endpoint_count(node) == 1;
170 
171 	return 0;
172 }
173 
174 static void graph_parse_convert(struct device *dev,
175 				struct device_node *ep,
176 				struct asoc_simple_data *adata)
177 {
178 	struct device_node *top = dev->of_node;
179 	struct device_node *port = of_get_parent(ep);
180 	struct device_node *ports = of_get_parent(port);
181 	struct device_node *node = of_graph_get_port_parent(ep);
182 
183 	asoc_simple_parse_convert(top,   NULL,   adata);
184 	if (of_node_name_eq(ports, "ports"))
185 		asoc_simple_parse_convert(ports, NULL, adata);
186 	asoc_simple_parse_convert(port,  NULL,   adata);
187 	asoc_simple_parse_convert(ep,    NULL,   adata);
188 
189 	of_node_put(port);
190 	of_node_put(ports);
191 	of_node_put(node);
192 }
193 
194 static void graph_parse_mclk_fs(struct device_node *top,
195 				struct device_node *ep,
196 				struct simple_dai_props *props)
197 {
198 	struct device_node *port	= of_get_parent(ep);
199 	struct device_node *ports	= of_get_parent(port);
200 
201 	of_property_read_u32(top,	"mclk-fs", &props->mclk_fs);
202 	if (of_node_name_eq(ports, "ports"))
203 		of_property_read_u32(ports, "mclk-fs", &props->mclk_fs);
204 	of_property_read_u32(port,	"mclk-fs", &props->mclk_fs);
205 	of_property_read_u32(ep,	"mclk-fs", &props->mclk_fs);
206 
207 	of_node_put(port);
208 	of_node_put(ports);
209 }
210 
211 static int graph_parse_node(struct asoc_simple_priv *priv,
212 			    struct device_node *ep,
213 			    struct link_info *li,
214 			    int *cpu)
215 {
216 	struct device *dev = simple_priv_to_dev(priv);
217 	struct device_node *top = dev->of_node;
218 	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
219 	struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
220 	struct snd_soc_dai_link_component *dlc;
221 	struct asoc_simple_dai *dai;
222 	int ret;
223 
224 	if (cpu) {
225 		dlc = asoc_link_to_cpu(dai_link, 0);
226 		dai = simple_props_to_dai_cpu(dai_props, 0);
227 	} else {
228 		dlc = asoc_link_to_codec(dai_link, 0);
229 		dai = simple_props_to_dai_codec(dai_props, 0);
230 	}
231 
232 	graph_parse_mclk_fs(top, ep, dai_props);
233 
234 	ret = asoc_simple_parse_dai(ep, dlc, cpu);
235 	if (ret < 0)
236 		return ret;
237 
238 	ret = asoc_simple_parse_tdm(ep, dai);
239 	if (ret < 0)
240 		return ret;
241 
242 	ret = asoc_simple_parse_clk(dev, ep, dai, dlc);
243 	if (ret < 0)
244 		return ret;
245 
246 	return 0;
247 }
248 
249 static int graph_link_init(struct asoc_simple_priv *priv,
250 			   struct device_node *cpu_ep,
251 			   struct device_node *codec_ep,
252 			   struct link_info *li,
253 			   char *name)
254 {
255 	struct device *dev = simple_priv_to_dev(priv);
256 	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
257 	int ret;
258 
259 	ret = asoc_simple_parse_daifmt(dev, cpu_ep, codec_ep,
260 				       NULL, &dai_link->dai_fmt);
261 	if (ret < 0)
262 		return ret;
263 
264 	dai_link->init		= asoc_simple_dai_init;
265 	dai_link->ops		= &graph_ops;
266 	if (priv->ops)
267 		dai_link->ops	= priv->ops;
268 
269 	return asoc_simple_set_dailink_name(dev, dai_link, name);
270 }
271 
272 static int graph_dai_link_of_dpcm(struct asoc_simple_priv *priv,
273 				  struct device_node *cpu_ep,
274 				  struct device_node *codec_ep,
275 				  struct link_info *li)
276 {
277 	struct device *dev = simple_priv_to_dev(priv);
278 	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
279 	struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
280 	struct device_node *top = dev->of_node;
281 	struct device_node *ep = li->cpu ? cpu_ep : codec_ep;
282 	char dai_name[64];
283 	int ret;
284 
285 	dev_dbg(dev, "link_of DPCM (%pOF)\n", ep);
286 
287 	if (li->cpu) {
288 		struct snd_soc_card *card = simple_priv_to_card(priv);
289 		struct snd_soc_dai_link_component *cpus = asoc_link_to_cpu(dai_link, 0);
290 		struct snd_soc_dai_link_component *platforms = asoc_link_to_platform(dai_link, 0);
291 		int is_single_links = 0;
292 
293 		/* Codec is dummy */
294 
295 		/* FE settings */
296 		dai_link->dynamic		= 1;
297 		dai_link->dpcm_merged_format	= 1;
298 
299 		ret = graph_parse_node(priv, cpu_ep, li, &is_single_links);
300 		if (ret)
301 			return ret;
302 
303 		snprintf(dai_name, sizeof(dai_name),
304 			 "fe.%pOFP.%s", cpus->of_node, cpus->dai_name);
305 		/*
306 		 * In BE<->BE connections it is not required to create
307 		 * PCM devices at CPU end of the dai link and thus 'no_pcm'
308 		 * flag needs to be set. It is useful when there are many
309 		 * BE components and some of these have to be connected to
310 		 * form a valid audio path.
311 		 *
312 		 * For example: FE <-> BE1 <-> BE2 <-> ... <-> BEn where
313 		 * there are 'n' BE components in the path.
314 		 */
315 		if (card->component_chaining && !soc_component_is_pcm(cpus)) {
316 			dai_link->no_pcm = 1;
317 			dai_link->be_hw_params_fixup = asoc_simple_be_hw_params_fixup;
318 		}
319 
320 		asoc_simple_canonicalize_cpu(cpus, is_single_links);
321 		asoc_simple_canonicalize_platform(platforms, cpus);
322 	} else {
323 		struct snd_soc_codec_conf *cconf = simple_props_to_codec_conf(dai_props, 0);
324 		struct snd_soc_dai_link_component *codecs = asoc_link_to_codec(dai_link, 0);
325 		struct device_node *port;
326 		struct device_node *ports;
327 
328 		/* CPU is dummy */
329 
330 		/* BE settings */
331 		dai_link->no_pcm		= 1;
332 		dai_link->be_hw_params_fixup	= asoc_simple_be_hw_params_fixup;
333 
334 		ret = graph_parse_node(priv, codec_ep, li, NULL);
335 		if (ret < 0)
336 			return ret;
337 
338 		snprintf(dai_name, sizeof(dai_name),
339 			 "be.%pOFP.%s", codecs->of_node, codecs->dai_name);
340 
341 		/* check "prefix" from top node */
342 		port = of_get_parent(ep);
343 		ports = of_get_parent(port);
344 		snd_soc_of_parse_node_prefix(top, cconf, codecs->of_node,
345 					      "prefix");
346 		if (of_node_name_eq(ports, "ports"))
347 			snd_soc_of_parse_node_prefix(ports, cconf, codecs->of_node, "prefix");
348 		snd_soc_of_parse_node_prefix(port, cconf, codecs->of_node,
349 					     "prefix");
350 
351 		of_node_put(ports);
352 		of_node_put(port);
353 	}
354 
355 	graph_parse_convert(dev, ep, &dai_props->adata);
356 
357 	snd_soc_dai_link_set_capabilities(dai_link);
358 
359 	ret = graph_link_init(priv, cpu_ep, codec_ep, li, dai_name);
360 
361 	li->link++;
362 
363 	return ret;
364 }
365 
366 static int graph_dai_link_of(struct asoc_simple_priv *priv,
367 			     struct device_node *cpu_ep,
368 			     struct device_node *codec_ep,
369 			     struct link_info *li)
370 {
371 	struct device *dev = simple_priv_to_dev(priv);
372 	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
373 	struct snd_soc_dai_link_component *cpus = asoc_link_to_cpu(dai_link, 0);
374 	struct snd_soc_dai_link_component *codecs = asoc_link_to_codec(dai_link, 0);
375 	struct snd_soc_dai_link_component *platforms = asoc_link_to_platform(dai_link, 0);
376 	char dai_name[64];
377 	int ret, is_single_links = 0;
378 
379 	dev_dbg(dev, "link_of (%pOF)\n", cpu_ep);
380 
381 	ret = graph_parse_node(priv, cpu_ep, li, &is_single_links);
382 	if (ret < 0)
383 		return ret;
384 
385 	ret = graph_parse_node(priv, codec_ep, li, NULL);
386 	if (ret < 0)
387 		return ret;
388 
389 	snprintf(dai_name, sizeof(dai_name),
390 		 "%s-%s", cpus->dai_name, codecs->dai_name);
391 
392 	asoc_simple_canonicalize_cpu(cpus, is_single_links);
393 	asoc_simple_canonicalize_platform(platforms, cpus);
394 
395 	ret = graph_link_init(priv, cpu_ep, codec_ep, li, dai_name);
396 	if (ret < 0)
397 		return ret;
398 
399 	li->link++;
400 
401 	return 0;
402 }
403 
404 static inline bool parse_as_dpcm_link(struct asoc_simple_priv *priv,
405 				      struct device_node *codec_port,
406 				      struct asoc_simple_data *adata)
407 {
408 	if (priv->force_dpcm)
409 		return true;
410 
411 	if (!priv->dpcm_selectable)
412 		return false;
413 
414 	/*
415 	 * It is DPCM
416 	 * if Codec port has many endpoints,
417 	 * or has convert-xxx property
418 	 */
419 	if ((of_get_child_count(codec_port) > 1) ||
420 	    asoc_simple_is_convert_required(adata))
421 		return true;
422 
423 	return false;
424 }
425 
426 static int __graph_for_each_link(struct asoc_simple_priv *priv,
427 			struct link_info *li,
428 			int (*func_noml)(struct asoc_simple_priv *priv,
429 					 struct device_node *cpu_ep,
430 					 struct device_node *codec_ep,
431 					 struct link_info *li),
432 			int (*func_dpcm)(struct asoc_simple_priv *priv,
433 					 struct device_node *cpu_ep,
434 					 struct device_node *codec_ep,
435 					 struct link_info *li))
436 {
437 	struct of_phandle_iterator it;
438 	struct device *dev = simple_priv_to_dev(priv);
439 	struct device_node *node = dev->of_node;
440 	struct device_node *cpu_port;
441 	struct device_node *cpu_ep;
442 	struct device_node *codec_ep;
443 	struct device_node *codec_port;
444 	struct device_node *codec_port_old = NULL;
445 	struct asoc_simple_data adata;
446 	int rc, ret = 0;
447 
448 	/* loop for all listed CPU port */
449 	of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
450 		cpu_port = it.node;
451 		cpu_ep	 = NULL;
452 
453 		/* loop for all CPU endpoint */
454 		while (1) {
455 			cpu_ep = of_get_next_child(cpu_port, cpu_ep);
456 			if (!cpu_ep)
457 				break;
458 
459 			/* get codec */
460 			codec_ep = of_graph_get_remote_endpoint(cpu_ep);
461 			codec_port = of_get_parent(codec_ep);
462 
463 			/* get convert-xxx property */
464 			memset(&adata, 0, sizeof(adata));
465 			graph_parse_convert(dev, codec_ep, &adata);
466 			graph_parse_convert(dev, cpu_ep,   &adata);
467 
468 			/* check if link requires DPCM parsing */
469 			if (parse_as_dpcm_link(priv, codec_port, &adata)) {
470 				/*
471 				 * Codec endpoint can be NULL for pluggable audio HW.
472 				 * Platform DT can populate the Codec endpoint depending on the
473 				 * plugged HW.
474 				 */
475 				/* Do it all CPU endpoint, and 1st Codec endpoint */
476 				if (li->cpu ||
477 				    ((codec_port_old != codec_port) && codec_ep))
478 					ret = func_dpcm(priv, cpu_ep, codec_ep, li);
479 			/* else normal sound */
480 			} else {
481 				if (li->cpu)
482 					ret = func_noml(priv, cpu_ep, codec_ep, li);
483 			}
484 
485 			of_node_put(codec_ep);
486 			of_node_put(codec_port);
487 
488 			if (ret < 0) {
489 				of_node_put(cpu_ep);
490 				return ret;
491 			}
492 
493 			codec_port_old = codec_port;
494 		}
495 	}
496 
497 	return 0;
498 }
499 
500 static int graph_for_each_link(struct asoc_simple_priv *priv,
501 			       struct link_info *li,
502 			       int (*func_noml)(struct asoc_simple_priv *priv,
503 						struct device_node *cpu_ep,
504 						struct device_node *codec_ep,
505 						struct link_info *li),
506 			       int (*func_dpcm)(struct asoc_simple_priv *priv,
507 						struct device_node *cpu_ep,
508 						struct device_node *codec_ep,
509 						struct link_info *li))
510 {
511 	int ret;
512 	/*
513 	 * Detect all CPU first, and Detect all Codec 2nd.
514 	 *
515 	 * In Normal sound case, all DAIs are detected
516 	 * as "CPU-Codec".
517 	 *
518 	 * In DPCM sound case,
519 	 * all CPUs   are detected as "CPU-dummy", and
520 	 * all Codecs are detected as "dummy-Codec".
521 	 * To avoid random sub-device numbering,
522 	 * detect "dummy-Codec" in last;
523 	 */
524 	for (li->cpu = 1; li->cpu >= 0; li->cpu--) {
525 		ret = __graph_for_each_link(priv, li, func_noml, func_dpcm);
526 		if (ret < 0)
527 			break;
528 	}
529 
530 	return ret;
531 }
532 
533 static int graph_get_dais_count(struct asoc_simple_priv *priv,
534 				struct link_info *li);
535 
536 int audio_graph_parse_of(struct asoc_simple_priv *priv, struct device *dev)
537 {
538 	struct snd_soc_card *card = simple_priv_to_card(priv);
539 	struct link_info *li;
540 	int ret;
541 
542 	li = devm_kzalloc(dev, sizeof(*li), GFP_KERNEL);
543 	if (!li)
544 		return -ENOMEM;
545 
546 	card->owner = THIS_MODULE;
547 	card->dev = dev;
548 
549 	ret = graph_get_dais_count(priv, li);
550 	if (ret < 0)
551 		return ret;
552 
553 	if (!li->link)
554 		return -EINVAL;
555 
556 	ret = asoc_simple_init_priv(priv, li);
557 	if (ret < 0)
558 		return ret;
559 
560 	priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
561 	if (IS_ERR(priv->pa_gpio)) {
562 		ret = PTR_ERR(priv->pa_gpio);
563 		dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
564 		return ret;
565 	}
566 
567 	ret = asoc_simple_parse_widgets(card, NULL);
568 	if (ret < 0)
569 		return ret;
570 
571 	ret = asoc_simple_parse_routing(card, NULL);
572 	if (ret < 0)
573 		return ret;
574 
575 	memset(li, 0, sizeof(*li));
576 	ret = graph_for_each_link(priv, li,
577 				  graph_dai_link_of,
578 				  graph_dai_link_of_dpcm);
579 	if (ret < 0)
580 		goto err;
581 
582 	ret = asoc_simple_parse_card_name(card, NULL);
583 	if (ret < 0)
584 		goto err;
585 
586 	snd_soc_card_set_drvdata(card, priv);
587 
588 	asoc_simple_debug_info(priv);
589 
590 	ret = devm_snd_soc_register_card(dev, card);
591 	if (ret < 0)
592 		goto err;
593 
594 	devm_kfree(dev, li);
595 	return 0;
596 
597 err:
598 	asoc_simple_clean_reference(card);
599 
600 	return dev_err_probe(dev, ret, "parse error\n");
601 }
602 EXPORT_SYMBOL_GPL(audio_graph_parse_of);
603 
604 static int graph_count_noml(struct asoc_simple_priv *priv,
605 			    struct device_node *cpu_ep,
606 			    struct device_node *codec_ep,
607 			    struct link_info *li)
608 {
609 	struct device *dev = simple_priv_to_dev(priv);
610 
611 	if (li->link >= SNDRV_MAX_LINKS) {
612 		dev_err(dev, "too many links\n");
613 		return -EINVAL;
614 	}
615 
616 	li->num[li->link].cpus		= 1;
617 	li->num[li->link].codecs	= 1;
618 	li->num[li->link].platforms     = 1;
619 
620 	li->link += 1; /* 1xCPU-Codec */
621 
622 	dev_dbg(dev, "Count As Normal\n");
623 
624 	return 0;
625 }
626 
627 static int graph_count_dpcm(struct asoc_simple_priv *priv,
628 			    struct device_node *cpu_ep,
629 			    struct device_node *codec_ep,
630 			    struct link_info *li)
631 {
632 	struct device *dev = simple_priv_to_dev(priv);
633 
634 	if (li->link >= SNDRV_MAX_LINKS) {
635 		dev_err(dev, "too many links\n");
636 		return -EINVAL;
637 	}
638 
639 	if (li->cpu) {
640 		li->num[li->link].cpus		= 1;
641 		li->num[li->link].platforms     = 1;
642 
643 		li->link++; /* 1xCPU-dummy */
644 	} else {
645 		li->num[li->link].codecs	= 1;
646 
647 		li->link++; /* 1xdummy-Codec */
648 	}
649 
650 	dev_dbg(dev, "Count As DPCM\n");
651 
652 	return 0;
653 }
654 
655 static int graph_get_dais_count(struct asoc_simple_priv *priv,
656 				struct link_info *li)
657 {
658 	/*
659 	 * link_num :	number of links.
660 	 *		CPU-Codec / CPU-dummy / dummy-Codec
661 	 * dais_num :	number of DAIs
662 	 * ccnf_num :	number of codec_conf
663 	 *		same number for "dummy-Codec"
664 	 *
665 	 * ex1)
666 	 * CPU0 --- Codec0	link : 5
667 	 * CPU1 --- Codec1	dais : 7
668 	 * CPU2 -/		ccnf : 1
669 	 * CPU3 --- Codec2
670 	 *
671 	 *	=> 5 links = 2xCPU-Codec + 2xCPU-dummy + 1xdummy-Codec
672 	 *	=> 7 DAIs  = 4xCPU + 3xCodec
673 	 *	=> 1 ccnf  = 1xdummy-Codec
674 	 *
675 	 * ex2)
676 	 * CPU0 --- Codec0	link : 5
677 	 * CPU1 --- Codec1	dais : 6
678 	 * CPU2 -/		ccnf : 1
679 	 * CPU3 -/
680 	 *
681 	 *	=> 5 links = 1xCPU-Codec + 3xCPU-dummy + 1xdummy-Codec
682 	 *	=> 6 DAIs  = 4xCPU + 2xCodec
683 	 *	=> 1 ccnf  = 1xdummy-Codec
684 	 *
685 	 * ex3)
686 	 * CPU0 --- Codec0	link : 6
687 	 * CPU1 -/		dais : 6
688 	 * CPU2 --- Codec1	ccnf : 2
689 	 * CPU3 -/
690 	 *
691 	 *	=> 6 links = 0xCPU-Codec + 4xCPU-dummy + 2xdummy-Codec
692 	 *	=> 6 DAIs  = 4xCPU + 2xCodec
693 	 *	=> 2 ccnf  = 2xdummy-Codec
694 	 *
695 	 * ex4)
696 	 * CPU0 --- Codec0 (convert-rate)	link : 3
697 	 * CPU1 --- Codec1			dais : 4
698 	 *					ccnf : 1
699 	 *
700 	 *	=> 3 links = 1xCPU-Codec + 1xCPU-dummy + 1xdummy-Codec
701 	 *	=> 4 DAIs  = 2xCPU + 2xCodec
702 	 *	=> 1 ccnf  = 1xdummy-Codec
703 	 */
704 	return graph_for_each_link(priv, li,
705 				   graph_count_noml,
706 				   graph_count_dpcm);
707 }
708 
709 static int graph_probe(struct platform_device *pdev)
710 {
711 	struct asoc_simple_priv *priv;
712 	struct device *dev = &pdev->dev;
713 	struct snd_soc_card *card;
714 
715 	/* Allocate the private data and the DAI link array */
716 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
717 	if (!priv)
718 		return -ENOMEM;
719 
720 	card = simple_priv_to_card(priv);
721 	card->dapm_widgets	= graph_dapm_widgets;
722 	card->num_dapm_widgets	= ARRAY_SIZE(graph_dapm_widgets);
723 	card->probe		= asoc_graph_card_probe;
724 
725 	if (of_device_get_match_data(dev))
726 		priv->dpcm_selectable = 1;
727 
728 	return audio_graph_parse_of(priv, dev);
729 }
730 
731 static const struct of_device_id graph_of_match[] = {
732 	{ .compatible = "audio-graph-card", },
733 	{ .compatible = "audio-graph-scu-card",
734 	  .data = (void *)DPCM_SELECTABLE },
735 	{},
736 };
737 MODULE_DEVICE_TABLE(of, graph_of_match);
738 
739 static struct platform_driver graph_card = {
740 	.driver = {
741 		.name = "asoc-audio-graph-card",
742 		.pm = &snd_soc_pm_ops,
743 		.of_match_table = graph_of_match,
744 	},
745 	.probe = graph_probe,
746 	.remove = asoc_simple_remove,
747 };
748 module_platform_driver(graph_card);
749 
750 MODULE_ALIAS("platform:asoc-audio-graph-card");
751 MODULE_LICENSE("GPL v2");
752 MODULE_DESCRIPTION("ASoC Audio Graph Sound Card");
753 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
754