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 		return ret;
163 
164 	dlc->of_node = node;
165 
166 	if (is_single_link)
167 		*is_single_link = of_graph_get_endpoint_count(node) == 1;
168 
169 	return 0;
170 }
171 
172 static void graph_parse_convert(struct device *dev,
173 				struct device_node *ep,
174 				struct asoc_simple_data *adata)
175 {
176 	struct device_node *top = dev->of_node;
177 	struct device_node *port = of_get_parent(ep);
178 	struct device_node *ports = of_get_parent(port);
179 	struct device_node *node = of_graph_get_port_parent(ep);
180 
181 	asoc_simple_parse_convert(top,   NULL,   adata);
182 	if (of_node_name_eq(ports, "ports"))
183 		asoc_simple_parse_convert(ports, NULL, adata);
184 	asoc_simple_parse_convert(port,  NULL,   adata);
185 	asoc_simple_parse_convert(ep,    NULL,   adata);
186 
187 	of_node_put(port);
188 	of_node_put(ports);
189 	of_node_put(node);
190 }
191 
192 static void graph_parse_mclk_fs(struct device_node *top,
193 				struct device_node *ep,
194 				struct simple_dai_props *props)
195 {
196 	struct device_node *port	= of_get_parent(ep);
197 	struct device_node *ports	= of_get_parent(port);
198 
199 	of_property_read_u32(top,	"mclk-fs", &props->mclk_fs);
200 	if (of_node_name_eq(ports, "ports"))
201 		of_property_read_u32(ports, "mclk-fs", &props->mclk_fs);
202 	of_property_read_u32(port,	"mclk-fs", &props->mclk_fs);
203 	of_property_read_u32(ep,	"mclk-fs", &props->mclk_fs);
204 
205 	of_node_put(port);
206 	of_node_put(ports);
207 }
208 
209 static int graph_parse_node(struct asoc_simple_priv *priv,
210 			    struct device_node *ep,
211 			    struct link_info *li,
212 			    int *cpu)
213 {
214 	struct device *dev = simple_priv_to_dev(priv);
215 	struct device_node *top = dev->of_node;
216 	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
217 	struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
218 	struct snd_soc_dai_link_component *dlc;
219 	struct asoc_simple_dai *dai;
220 	int ret;
221 
222 	if (cpu) {
223 		dlc = asoc_link_to_cpu(dai_link, 0);
224 		dai = simple_props_to_dai_cpu(dai_props, 0);
225 	} else {
226 		dlc = asoc_link_to_codec(dai_link, 0);
227 		dai = simple_props_to_dai_codec(dai_props, 0);
228 	}
229 
230 	graph_parse_mclk_fs(top, ep, dai_props);
231 
232 	ret = asoc_simple_parse_dai(ep, dlc, cpu);
233 	if (ret < 0)
234 		return ret;
235 
236 	ret = asoc_simple_parse_tdm(ep, dai);
237 	if (ret < 0)
238 		return ret;
239 
240 	ret = asoc_simple_parse_clk(dev, ep, dai, dlc);
241 	if (ret < 0)
242 		return ret;
243 
244 	return 0;
245 }
246 
247 static int graph_link_init(struct asoc_simple_priv *priv,
248 			   struct device_node *cpu_ep,
249 			   struct device_node *codec_ep,
250 			   struct link_info *li,
251 			   char *name)
252 {
253 	struct device *dev = simple_priv_to_dev(priv);
254 	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
255 	int ret;
256 
257 	ret = asoc_simple_parse_daifmt(dev, cpu_ep, codec_ep,
258 				       NULL, &dai_link->dai_fmt);
259 	if (ret < 0)
260 		return ret;
261 
262 	dai_link->init		= asoc_simple_dai_init;
263 	dai_link->ops		= &graph_ops;
264 	if (priv->ops)
265 		dai_link->ops	= priv->ops;
266 
267 	return asoc_simple_set_dailink_name(dev, dai_link, name);
268 }
269 
270 static int graph_dai_link_of_dpcm(struct asoc_simple_priv *priv,
271 				  struct device_node *cpu_ep,
272 				  struct device_node *codec_ep,
273 				  struct link_info *li)
274 {
275 	struct device *dev = simple_priv_to_dev(priv);
276 	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
277 	struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
278 	struct device_node *top = dev->of_node;
279 	struct device_node *ep = li->cpu ? cpu_ep : codec_ep;
280 	char dai_name[64];
281 	int ret;
282 
283 	dev_dbg(dev, "link_of DPCM (%pOF)\n", ep);
284 
285 	if (li->cpu) {
286 		struct snd_soc_card *card = simple_priv_to_card(priv);
287 		struct snd_soc_dai_link_component *cpus = asoc_link_to_cpu(dai_link, 0);
288 		struct snd_soc_dai_link_component *platforms = asoc_link_to_platform(dai_link, 0);
289 		int is_single_links = 0;
290 
291 		/* Codec is dummy */
292 
293 		/* FE settings */
294 		dai_link->dynamic		= 1;
295 		dai_link->dpcm_merged_format	= 1;
296 
297 		ret = graph_parse_node(priv, cpu_ep, li, &is_single_links);
298 		if (ret)
299 			return ret;
300 
301 		snprintf(dai_name, sizeof(dai_name),
302 			 "fe.%pOFP.%s", cpus->of_node, cpus->dai_name);
303 		/*
304 		 * In BE<->BE connections it is not required to create
305 		 * PCM devices at CPU end of the dai link and thus 'no_pcm'
306 		 * flag needs to be set. It is useful when there are many
307 		 * BE components and some of these have to be connected to
308 		 * form a valid audio path.
309 		 *
310 		 * For example: FE <-> BE1 <-> BE2 <-> ... <-> BEn where
311 		 * there are 'n' BE components in the path.
312 		 */
313 		if (card->component_chaining && !soc_component_is_pcm(cpus)) {
314 			dai_link->no_pcm = 1;
315 			dai_link->be_hw_params_fixup = asoc_simple_be_hw_params_fixup;
316 		}
317 
318 		asoc_simple_canonicalize_cpu(cpus, is_single_links);
319 		asoc_simple_canonicalize_platform(platforms, cpus);
320 	} else {
321 		struct snd_soc_codec_conf *cconf = simple_props_to_codec_conf(dai_props, 0);
322 		struct snd_soc_dai_link_component *codecs = asoc_link_to_codec(dai_link, 0);
323 		struct device_node *port;
324 		struct device_node *ports;
325 
326 		/* CPU is dummy */
327 
328 		/* BE settings */
329 		dai_link->no_pcm		= 1;
330 		dai_link->be_hw_params_fixup	= asoc_simple_be_hw_params_fixup;
331 
332 		ret = graph_parse_node(priv, codec_ep, li, NULL);
333 		if (ret < 0)
334 			return ret;
335 
336 		snprintf(dai_name, sizeof(dai_name),
337 			 "be.%pOFP.%s", codecs->of_node, codecs->dai_name);
338 
339 		/* check "prefix" from top node */
340 		port = of_get_parent(ep);
341 		ports = of_get_parent(port);
342 		snd_soc_of_parse_node_prefix(top, cconf, codecs->of_node,
343 					      "prefix");
344 		if (of_node_name_eq(ports, "ports"))
345 			snd_soc_of_parse_node_prefix(ports, cconf, codecs->of_node, "prefix");
346 		snd_soc_of_parse_node_prefix(port, cconf, codecs->of_node,
347 					     "prefix");
348 
349 		of_node_put(ports);
350 		of_node_put(port);
351 	}
352 
353 	graph_parse_convert(dev, ep, &dai_props->adata);
354 
355 	snd_soc_dai_link_set_capabilities(dai_link);
356 
357 	ret = graph_link_init(priv, cpu_ep, codec_ep, li, dai_name);
358 
359 	li->link++;
360 
361 	return ret;
362 }
363 
364 static int graph_dai_link_of(struct asoc_simple_priv *priv,
365 			     struct device_node *cpu_ep,
366 			     struct device_node *codec_ep,
367 			     struct link_info *li)
368 {
369 	struct device *dev = simple_priv_to_dev(priv);
370 	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
371 	struct snd_soc_dai_link_component *cpus = asoc_link_to_cpu(dai_link, 0);
372 	struct snd_soc_dai_link_component *codecs = asoc_link_to_codec(dai_link, 0);
373 	struct snd_soc_dai_link_component *platforms = asoc_link_to_platform(dai_link, 0);
374 	char dai_name[64];
375 	int ret, is_single_links = 0;
376 
377 	dev_dbg(dev, "link_of (%pOF)\n", cpu_ep);
378 
379 	ret = graph_parse_node(priv, cpu_ep, li, &is_single_links);
380 	if (ret < 0)
381 		return ret;
382 
383 	ret = graph_parse_node(priv, codec_ep, li, NULL);
384 	if (ret < 0)
385 		return ret;
386 
387 	snprintf(dai_name, sizeof(dai_name),
388 		 "%s-%s", cpus->dai_name, codecs->dai_name);
389 
390 	asoc_simple_canonicalize_cpu(cpus, is_single_links);
391 	asoc_simple_canonicalize_platform(platforms, cpus);
392 
393 	ret = graph_link_init(priv, cpu_ep, codec_ep, li, dai_name);
394 	if (ret < 0)
395 		return ret;
396 
397 	li->link++;
398 
399 	return 0;
400 }
401 
402 static inline bool parse_as_dpcm_link(struct asoc_simple_priv *priv,
403 				      struct device_node *codec_port,
404 				      struct asoc_simple_data *adata)
405 {
406 	if (priv->force_dpcm)
407 		return true;
408 
409 	if (!priv->dpcm_selectable)
410 		return false;
411 
412 	/*
413 	 * It is DPCM
414 	 * if Codec port has many endpoints,
415 	 * or has convert-xxx property
416 	 */
417 	if ((of_get_child_count(codec_port) > 1) ||
418 	    (adata->convert_rate || adata->convert_channels))
419 		return true;
420 
421 	return false;
422 }
423 
424 static int __graph_for_each_link(struct asoc_simple_priv *priv,
425 			struct link_info *li,
426 			int (*func_noml)(struct asoc_simple_priv *priv,
427 					 struct device_node *cpu_ep,
428 					 struct device_node *codec_ep,
429 					 struct link_info *li),
430 			int (*func_dpcm)(struct asoc_simple_priv *priv,
431 					 struct device_node *cpu_ep,
432 					 struct device_node *codec_ep,
433 					 struct link_info *li))
434 {
435 	struct of_phandle_iterator it;
436 	struct device *dev = simple_priv_to_dev(priv);
437 	struct device_node *node = dev->of_node;
438 	struct device_node *cpu_port;
439 	struct device_node *cpu_ep;
440 	struct device_node *codec_ep;
441 	struct device_node *codec_port;
442 	struct device_node *codec_port_old = NULL;
443 	struct asoc_simple_data adata;
444 	int rc, ret = 0;
445 
446 	/* loop for all listed CPU port */
447 	of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
448 		cpu_port = it.node;
449 		cpu_ep	 = NULL;
450 
451 		/* loop for all CPU endpoint */
452 		while (1) {
453 			cpu_ep = of_get_next_child(cpu_port, cpu_ep);
454 			if (!cpu_ep)
455 				break;
456 
457 			/* get codec */
458 			codec_ep = of_graph_get_remote_endpoint(cpu_ep);
459 			codec_port = of_get_parent(codec_ep);
460 
461 			/* get convert-xxx property */
462 			memset(&adata, 0, sizeof(adata));
463 			graph_parse_convert(dev, codec_ep, &adata);
464 			graph_parse_convert(dev, cpu_ep,   &adata);
465 
466 			/* check if link requires DPCM parsing */
467 			if (parse_as_dpcm_link(priv, codec_port, &adata)) {
468 				/*
469 				 * Codec endpoint can be NULL for pluggable audio HW.
470 				 * Platform DT can populate the Codec endpoint depending on the
471 				 * plugged HW.
472 				 */
473 				/* Do it all CPU endpoint, and 1st Codec endpoint */
474 				if (li->cpu ||
475 				    ((codec_port_old != codec_port) && codec_ep))
476 					ret = func_dpcm(priv, cpu_ep, codec_ep, li);
477 			/* else normal sound */
478 			} else {
479 				if (li->cpu)
480 					ret = func_noml(priv, cpu_ep, codec_ep, li);
481 			}
482 
483 			of_node_put(codec_ep);
484 			of_node_put(codec_port);
485 
486 			if (ret < 0)
487 				return ret;
488 
489 			codec_port_old = codec_port;
490 		}
491 	}
492 
493 	return 0;
494 }
495 
496 static int graph_for_each_link(struct asoc_simple_priv *priv,
497 			       struct link_info *li,
498 			       int (*func_noml)(struct asoc_simple_priv *priv,
499 						struct device_node *cpu_ep,
500 						struct device_node *codec_ep,
501 						struct link_info *li),
502 			       int (*func_dpcm)(struct asoc_simple_priv *priv,
503 						struct device_node *cpu_ep,
504 						struct device_node *codec_ep,
505 						struct link_info *li))
506 {
507 	int ret;
508 	/*
509 	 * Detect all CPU first, and Detect all Codec 2nd.
510 	 *
511 	 * In Normal sound case, all DAIs are detected
512 	 * as "CPU-Codec".
513 	 *
514 	 * In DPCM sound case,
515 	 * all CPUs   are detected as "CPU-dummy", and
516 	 * all Codecs are detected as "dummy-Codec".
517 	 * To avoid random sub-device numbering,
518 	 * detect "dummy-Codec" in last;
519 	 */
520 	for (li->cpu = 1; li->cpu >= 0; li->cpu--) {
521 		ret = __graph_for_each_link(priv, li, func_noml, func_dpcm);
522 		if (ret < 0)
523 			break;
524 	}
525 
526 	return ret;
527 }
528 
529 static int graph_get_dais_count(struct asoc_simple_priv *priv,
530 				struct link_info *li);
531 
532 int audio_graph_parse_of(struct asoc_simple_priv *priv, struct device *dev)
533 {
534 	struct snd_soc_card *card = simple_priv_to_card(priv);
535 	struct link_info *li;
536 	int ret;
537 
538 	li = devm_kzalloc(dev, sizeof(*li), GFP_KERNEL);
539 	if (!li)
540 		return -ENOMEM;
541 
542 	card->owner = THIS_MODULE;
543 	card->dev = dev;
544 
545 	ret = graph_get_dais_count(priv, li);
546 	if (ret < 0)
547 		return ret;
548 
549 	if (!li->link)
550 		return -EINVAL;
551 
552 	ret = asoc_simple_init_priv(priv, li);
553 	if (ret < 0)
554 		return ret;
555 
556 	priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
557 	if (IS_ERR(priv->pa_gpio)) {
558 		ret = PTR_ERR(priv->pa_gpio);
559 		dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
560 		return ret;
561 	}
562 
563 	ret = asoc_simple_parse_widgets(card, NULL);
564 	if (ret < 0)
565 		return ret;
566 
567 	ret = asoc_simple_parse_routing(card, NULL);
568 	if (ret < 0)
569 		return ret;
570 
571 	memset(li, 0, sizeof(*li));
572 	ret = graph_for_each_link(priv, li,
573 				  graph_dai_link_of,
574 				  graph_dai_link_of_dpcm);
575 	if (ret < 0)
576 		goto err;
577 
578 	ret = asoc_simple_parse_card_name(card, NULL);
579 	if (ret < 0)
580 		goto err;
581 
582 	snd_soc_card_set_drvdata(card, priv);
583 
584 	asoc_simple_debug_info(priv);
585 
586 	ret = devm_snd_soc_register_card(dev, card);
587 	if (ret < 0)
588 		goto err;
589 
590 	devm_kfree(dev, li);
591 	return 0;
592 
593 err:
594 	asoc_simple_clean_reference(card);
595 
596 	return dev_err_probe(dev, ret, "parse error\n");
597 }
598 EXPORT_SYMBOL_GPL(audio_graph_parse_of);
599 
600 static int graph_count_noml(struct asoc_simple_priv *priv,
601 			    struct device_node *cpu_ep,
602 			    struct device_node *codec_ep,
603 			    struct link_info *li)
604 {
605 	struct device *dev = simple_priv_to_dev(priv);
606 
607 	if (li->link >= SNDRV_MAX_LINKS) {
608 		dev_err(dev, "too many links\n");
609 		return -EINVAL;
610 	}
611 
612 	li->num[li->link].cpus		= 1;
613 	li->num[li->link].codecs	= 1;
614 	li->num[li->link].platforms     = 1;
615 
616 	li->link += 1; /* 1xCPU-Codec */
617 
618 	dev_dbg(dev, "Count As Normal\n");
619 
620 	return 0;
621 }
622 
623 static int graph_count_dpcm(struct asoc_simple_priv *priv,
624 			    struct device_node *cpu_ep,
625 			    struct device_node *codec_ep,
626 			    struct link_info *li)
627 {
628 	struct device *dev = simple_priv_to_dev(priv);
629 
630 	if (li->link >= SNDRV_MAX_LINKS) {
631 		dev_err(dev, "too many links\n");
632 		return -EINVAL;
633 	}
634 
635 	if (li->cpu) {
636 		li->num[li->link].cpus		= 1;
637 		li->num[li->link].platforms     = 1;
638 
639 		li->link++; /* 1xCPU-dummy */
640 	} else {
641 		li->num[li->link].codecs	= 1;
642 
643 		li->link++; /* 1xdummy-Codec */
644 	}
645 
646 	dev_dbg(dev, "Count As DPCM\n");
647 
648 	return 0;
649 }
650 
651 static int graph_get_dais_count(struct asoc_simple_priv *priv,
652 				struct link_info *li)
653 {
654 	/*
655 	 * link_num :	number of links.
656 	 *		CPU-Codec / CPU-dummy / dummy-Codec
657 	 * dais_num :	number of DAIs
658 	 * ccnf_num :	number of codec_conf
659 	 *		same number for "dummy-Codec"
660 	 *
661 	 * ex1)
662 	 * CPU0 --- Codec0	link : 5
663 	 * CPU1 --- Codec1	dais : 7
664 	 * CPU2 -/		ccnf : 1
665 	 * CPU3 --- Codec2
666 	 *
667 	 *	=> 5 links = 2xCPU-Codec + 2xCPU-dummy + 1xdummy-Codec
668 	 *	=> 7 DAIs  = 4xCPU + 3xCodec
669 	 *	=> 1 ccnf  = 1xdummy-Codec
670 	 *
671 	 * ex2)
672 	 * CPU0 --- Codec0	link : 5
673 	 * CPU1 --- Codec1	dais : 6
674 	 * CPU2 -/		ccnf : 1
675 	 * CPU3 -/
676 	 *
677 	 *	=> 5 links = 1xCPU-Codec + 3xCPU-dummy + 1xdummy-Codec
678 	 *	=> 6 DAIs  = 4xCPU + 2xCodec
679 	 *	=> 1 ccnf  = 1xdummy-Codec
680 	 *
681 	 * ex3)
682 	 * CPU0 --- Codec0	link : 6
683 	 * CPU1 -/		dais : 6
684 	 * CPU2 --- Codec1	ccnf : 2
685 	 * CPU3 -/
686 	 *
687 	 *	=> 6 links = 0xCPU-Codec + 4xCPU-dummy + 2xdummy-Codec
688 	 *	=> 6 DAIs  = 4xCPU + 2xCodec
689 	 *	=> 2 ccnf  = 2xdummy-Codec
690 	 *
691 	 * ex4)
692 	 * CPU0 --- Codec0 (convert-rate)	link : 3
693 	 * CPU1 --- Codec1			dais : 4
694 	 *					ccnf : 1
695 	 *
696 	 *	=> 3 links = 1xCPU-Codec + 1xCPU-dummy + 1xdummy-Codec
697 	 *	=> 4 DAIs  = 2xCPU + 2xCodec
698 	 *	=> 1 ccnf  = 1xdummy-Codec
699 	 */
700 	return graph_for_each_link(priv, li,
701 				   graph_count_noml,
702 				   graph_count_dpcm);
703 }
704 
705 static int graph_probe(struct platform_device *pdev)
706 {
707 	struct asoc_simple_priv *priv;
708 	struct device *dev = &pdev->dev;
709 	struct snd_soc_card *card;
710 
711 	/* Allocate the private data and the DAI link array */
712 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
713 	if (!priv)
714 		return -ENOMEM;
715 
716 	card = simple_priv_to_card(priv);
717 	card->dapm_widgets	= graph_dapm_widgets;
718 	card->num_dapm_widgets	= ARRAY_SIZE(graph_dapm_widgets);
719 	card->probe		= asoc_graph_card_probe;
720 
721 	if (of_device_get_match_data(dev))
722 		priv->dpcm_selectable = 1;
723 
724 	return audio_graph_parse_of(priv, dev);
725 }
726 
727 static const struct of_device_id graph_of_match[] = {
728 	{ .compatible = "audio-graph-card", },
729 	{ .compatible = "audio-graph-scu-card",
730 	  .data = (void *)DPCM_SELECTABLE },
731 	{},
732 };
733 MODULE_DEVICE_TABLE(of, graph_of_match);
734 
735 static struct platform_driver graph_card = {
736 	.driver = {
737 		.name = "asoc-audio-graph-card",
738 		.pm = &snd_soc_pm_ops,
739 		.of_match_table = graph_of_match,
740 	},
741 	.probe = graph_probe,
742 	.remove = asoc_simple_remove,
743 };
744 module_platform_driver(graph_card);
745 
746 MODULE_ALIAS("platform:asoc-audio-graph-card");
747 MODULE_LICENSE("GPL v2");
748 MODULE_DESCRIPTION("ASoC Audio Graph Sound Card");
749 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
750