summaryrefslogtreecommitdiffstats
path: root/sound/soc/generic/audio-graph-card.c
blob: 6007e630573540eb62f003f4bebfbb16dcc8b70d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
// SPDX-License-Identifier: GPL-2.0
//
// ASoC audio graph sound card support
//
// Copyright (C) 2016 Renesas Solutions Corp.
// Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
//
// based on ${LINUX}/sound/soc/generic/simple-card.c

#include <linux/clk.h>
#include <linux/device.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <sound/simple_card_utils.h>

#define DPCM_SELECTABLE 1

#define PREFIX	"audio-graph-card,"

static int graph_outdrv_event(struct snd_soc_dapm_widget *w,
			      struct snd_kcontrol *kcontrol,
			      int event)
{
	struct snd_soc_dapm_context *dapm = w->dapm;
	struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(dapm->card);

	switch (event) {
	case SND_SOC_DAPM_POST_PMU:
		gpiod_set_value_cansleep(priv->pa_gpio, 1);
		break;
	case SND_SOC_DAPM_PRE_PMD:
		gpiod_set_value_cansleep(priv->pa_gpio, 0);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static const struct snd_soc_dapm_widget graph_dapm_widgets[] = {
	SND_SOC_DAPM_OUT_DRV_E("Amplifier", SND_SOC_NOPM,
			       0, 0, NULL, 0, graph_outdrv_event,
			       SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
};

static const struct snd_soc_ops graph_ops = {
	.startup	= asoc_simple_startup,
	.shutdown	= asoc_simple_shutdown,
	.hw_params	= asoc_simple_hw_params,
};

static int graph_get_dai_id(struct device_node *ep)
{
	struct device_node *node;
	struct device_node *endpoint;
	struct of_endpoint info;
	int i, id;
	const u32 *reg;
	int ret;

	/* use driver specified DAI ID if exist */
	ret = snd_soc_get_dai_id(ep);
	if (ret != -ENOTSUPP)
		return ret;

	/* use endpoint/port reg if exist */
	ret = of_graph_parse_endpoint(ep, &info);
	if (ret == 0) {
		/*
		 * Because it will count port/endpoint if it doesn't have "reg".
		 * But, we can't judge whether it has "no reg", or "reg = <0>"
		 * only of_graph_parse_endpoint().
		 * We need to check "reg" property
		 */
		if (of_get_property(ep,   "reg", NULL))
			return info.id;

		node = of_get_parent(ep);
		reg = of_get_property(node, "reg", NULL);
		of_node_put(node);
		if (reg)
			return info.port;
	}
	node = of_graph_get_port_parent(ep);

	/*
	 * Non HDMI sound case, counting port/endpoint on its DT
	 * is enough. Let's count it.
	 */
	i = 0;
	id = -1;
	for_each_endpoint_of_node(node, endpoint) {
		if (endpoint == ep)
			id = i;
		i++;
	}

	of_node_put(node);

	if (id < 0)
		return -ENODEV;

	return id;
}

static int asoc_simple_parse_dai(struct device_node *ep,
				 struct snd_soc_dai_link_component *dlc,
				 int *is_single_link)
{
	struct device_node *node;
	struct of_phandle_args args;
	int ret;

	if (!ep)
		return 0;

	node = of_graph_get_port_parent(ep);

	/* Get dai->name */
	args.np		= node;
	args.args[0]	= graph_get_dai_id(ep);
	args.args_count	= (of_graph_get_endpoint_count(node) > 1);

	/*
	 * FIXME
	 *
	 * Here, dlc->dai_name is pointer to CPU/Codec DAI name.
	 * If user unbinded CPU or Codec driver, but not for Sound Card,
	 * dlc->dai_name is keeping unbinded CPU or Codec
	 * driver's pointer.
	 *
	 * If user re-bind CPU or Codec driver again, ALSA SoC will try
	 * to rebind Card via snd_soc_try_rebind_card(), but because of
	 * above reason, it might can't bind Sound Card.
	 * Because Sound Card is pointing to released dai_name pointer.
	 *
	 * To avoid this rebind Card issue,
	 * 1) It needs to alloc memory to keep dai_name eventhough
	 *    CPU or Codec driver was unbinded, or
	 * 2) user need to rebind Sound Card everytime
	 *    if he unbinded CPU or Codec.
	 */
	ret = snd_soc_get_dai_name(&args, &dlc->dai_name);
	if (ret < 0)
		return ret;

	dlc->of_node = node;

	if (is_single_link)
		*is_single_link = of_graph_get_endpoint_count(node) == 1;

	return 0;
}

static void graph_parse_convert(struct device *dev,
				struct device_node *ep,
				struct asoc_simple_data *adata)
{
	struct device_node *top = dev->of_node;
	struct device_node *port = of_get_parent(ep);
	struct device_node *ports = of_get_parent(port);
	struct device_node *node = of_graph_get_port_parent(ep);

	asoc_simple_parse_convert(dev, top,   NULL,   adata);
	asoc_simple_parse_convert(dev, node,  PREFIX, adata);
	asoc_simple_parse_convert(dev, ports, NULL,   adata);
	asoc_simple_parse_convert(dev, port,  NULL,   adata);
	asoc_simple_parse_convert(dev, ep,    NULL,   adata);

	of_node_put(port);
	of_node_put(ports);
	of_node_put(node);
}

static void graph_parse_mclk_fs(struct device_node *top,
				struct device_node *ep,
				struct simple_dai_props *props)
{
	struct device_node *port	= of_get_parent(ep);
	struct device_node *ports	= of_get_parent(port);
	struct device_node *node	= of_graph_get_port_parent(ep);

	of_property_read_u32(top,	"mclk-fs", &props->mclk_fs);
	of_property_read_u32(ports,	"mclk-fs", &props->mclk_fs);
	of_property_read_u32(port,	"mclk-fs", &props->mclk_fs);
	of_property_read_u32(ep,	"mclk-fs", &props->mclk_fs);

	of_node_put(port);
	of_node_put(ports);
	of_node_put(node);
}

static int graph_dai_link_of_dpcm(struct asoc_simple_priv *priv,
				  struct device_node *cpu_ep,
				  struct device_node *codec_ep,
				  struct link_info *li,
				  int dup_codec)
{
	struct device *dev = simple_priv_to_dev(priv);
	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
	struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
	struct device_node *top = dev->of_node;
	struct device_node *ep = li->cpu ? cpu_ep : codec_ep;
	struct device_node *port;
	struct device_node *ports;
	struct device_node *node;
	struct asoc_simple_dai *dai;
	struct snd_soc_dai_link_component *cpus = dai_link->cpus;
	struct snd_soc_dai_link_component *codecs = dai_link->codecs;
	int ret;

	/* Do it all CPU endpoint, and 1st Codec endpoint */
	if (!li->cpu && dup_codec)
		return 0;

	port	= of_get_parent(ep);
	ports	= of_get_parent(port);
	node	= of_graph_get_port_parent(ep);

	li->link++;

	dev_dbg(dev, "link_of DPCM (%pOF)\n", ep);

	if (li->cpu) {
		int is_single_links = 0;

		/* BE is dummy */
		codecs->of_node		= NULL;
		codecs->dai_name	= "snd-soc-dummy-dai";
		codecs->name		= "snd-soc-dummy";

		/* FE settings */
		dai_link->dynamic		= 1;
		dai_link->dpcm_merged_format	= 1;

		dai =
		dai_props->cpu_dai	= &priv->dais[li->dais++];

		ret = asoc_simple_parse_cpu(ep, dai_link, &is_single_links);
		if (ret)
			goto out_put_node;

		ret = asoc_simple_parse_clk_cpu(dev, ep, dai_link, dai);
		if (ret < 0)
			goto out_put_node;

		ret = asoc_simple_set_dailink_name(dev, dai_link,
						   "fe.%s",
						   cpus->dai_name);
		if (ret < 0)
			goto out_put_node;

		/* card->num_links includes Codec */
		asoc_simple_canonicalize_cpu(dai_link, is_single_links);
	} else {
		struct snd_soc_codec_conf *cconf;

		/* FE is dummy */
		cpus->of_node		= NULL;
		cpus->dai_name		= "snd-soc-dummy-dai";
		cpus->name		= "snd-soc-dummy";

		/* BE settings */
		dai_link->no_pcm		= 1;
		dai_link->be_hw_params_fixup	= asoc_simple_be_hw_params_fixup;

		dai =
		dai_props->codec_dai	= &priv->dais[li->dais++];

		cconf =
		dai_props->codec_conf	= &priv->codec_conf[li->conf++];

		ret = asoc_simple_parse_codec(ep, dai_link);
		if (ret < 0)
			goto out_put_node;

		ret = asoc_simple_parse_clk_codec(dev, ep, dai_link, dai);
		if (ret < 0)
			goto out_put_node;

		ret = asoc_simple_set_dailink_name(dev, dai_link,
						   "be.%s",
						   codecs->dai_name);
		if (ret < 0)
			goto out_put_node;

		/* check "prefix" from top node */
		snd_soc_of_parse_node_prefix(top, cconf, codecs->of_node,
					      "prefix");
		snd_soc_of_parse_node_prefix(node, cconf, codecs->of_node,
					     PREFIX "prefix");
		snd_soc_of_parse_node_prefix(ports, cconf, codecs->of_node,
					     "prefix");
		snd_soc_of_parse_node_prefix(port, cconf, codecs->of_node,
					     "prefix");
	}

	graph_parse_convert(dev, ep, &dai_props->adata);
	graph_parse_mclk_fs(top, ep, dai_props);

	asoc_simple_canonicalize_platform(dai_link);

	ret = asoc_simple_parse_tdm(ep, dai);
	if (ret)
		goto out_put_node;

	ret = asoc_simple_parse_daifmt(dev, cpu_ep, codec_ep,
				       NULL, &dai_link->dai_fmt);
	if (ret < 0)
		goto out_put_node;

	dai_link->dpcm_playback		= 1;
	dai_link->dpcm_capture		= 1;
	dai_link->ops			= &graph_ops;
	dai_link->init			= asoc_simple_dai_init;

out_put_node:
	of_node_put(ports);
	of_node_put(port);
	of_node_put(node);
	return ret;
}

static int graph_dai_link_of(struct asoc_simple_priv *priv,
			     struct device_node *cpu_ep,
			     struct device_node *codec_ep,
			     struct link_info *li)
{
	struct device *dev = simple_priv_to_dev(priv);
	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
	struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
	struct device_node *top = dev->of_node;
	struct asoc_simple_dai *cpu_dai;
	struct asoc_simple_dai *codec_dai;
	int ret, single_cpu;

	/* Do it only CPU turn */
	if (!li->cpu)
		return 0;

	dev_dbg(dev, "link_of (%pOF)\n", cpu_ep);

	li->link++;

	cpu_dai			=
	dai_props->cpu_dai	= &priv->dais[li->dais++];
	codec_dai		=
	dai_props->codec_dai	= &priv->dais[li->dais++];

	/* Factor to mclk, used in hw_params() */
	graph_parse_mclk_fs(top, cpu_ep,   dai_props);
	graph_parse_mclk_fs(top, codec_ep, dai_props);

	ret = asoc_simple_parse_daifmt(dev, cpu_ep, codec_ep,
				       NULL, &dai_link->dai_fmt);
	if (ret < 0)
		return ret;

	ret = asoc_simple_parse_cpu(cpu_ep, dai_link, &single_cpu);
	if (ret < 0)
		return ret;

	ret = asoc_simple_parse_codec(codec_ep, dai_link);
	if (ret < 0)
		return ret;

	ret = asoc_simple_parse_tdm(cpu_ep, cpu_dai);
	if (ret < 0)
		return ret;

	ret = asoc_simple_parse_tdm(codec_ep, codec_dai);
	if (ret < 0)
		return ret;

	ret = asoc_simple_parse_clk_cpu(dev, cpu_ep, dai_link, cpu_dai);
	if (ret < 0)
		return ret;

	ret = asoc_simple_parse_clk_codec(dev, codec_ep, dai_link, codec_dai);
	if (ret < 0)
		return ret;

	ret = asoc_simple_set_dailink_name(dev, dai_link,
					   "%s-%s",
					   dai_link->cpus->dai_name,
					   dai_link->codecs->dai_name);
	if (ret < 0)
		return ret;

	dai_link->ops = &graph_ops;
	dai_link->init = asoc_simple_dai_init;

	asoc_simple_canonicalize_cpu(dai_link, single_cpu);
	asoc_simple_canonicalize_platform(dai_link);

	return 0;
}

static int graph_for_each_link(struct asoc_simple_priv *priv,
			struct link_info *li,
			int (*func_noml)(struct asoc_simple_priv *priv,
					 struct device_node *cpu_ep,
					 struct device_node *codec_ep,
					 struct link_info *li),
			int (*func_dpcm)(struct asoc_simple_priv *priv,
					 struct device_node *cpu_ep,
					 struct device_node *codec_ep,
					 struct link_info *li, int dup_codec))
{
	struct of_phandle_iterator it;
	struct device *dev = simple_priv_to_dev(priv);
	struct device_node *node = dev->of_node;
	struct device_node *cpu_port;
	struct device_node *cpu_ep;
	struct device_node *codec_ep;
	struct device_node *codec_port;
	struct device_node *codec_port_old = NULL;
	struct asoc_simple_data adata;
	uintptr_t dpcm_selectable = (uintptr_t)of_device_get_match_data(dev);
	int rc, ret;

	/* loop for all listed CPU port */
	of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
		cpu_port = it.node;
		cpu_ep	 = NULL;

		/* loop for all CPU endpoint */
		while (1) {
			cpu_ep = of_get_next_child(cpu_port, cpu_ep);
			if (!cpu_ep)
				break;

			/* get codec */
			codec_ep = of_graph_get_remote_endpoint(cpu_ep);
			codec_port = of_get_parent(codec_ep);

			/* get convert-xxx property */
			memset(&adata, 0, sizeof(adata));
			graph_parse_convert(dev, codec_ep, &adata);
			graph_parse_convert(dev, cpu_ep,   &adata);

			/*
			 * It is DPCM
			 * if Codec port has many endpoints,
			 * or has convert-xxx property
			 */
			if (dpcm_selectable &&
			    ((of_get_child_count(codec_port) > 1) ||
			     adata.convert_rate || adata.convert_channels))
				ret = func_dpcm(priv, cpu_ep, codec_ep, li,
						(codec_port_old == codec_port));
			/* else normal sound */
			else
				ret = func_noml(priv, cpu_ep, codec_ep, li);

			of_node_put(codec_ep);
			of_node_put(codec_port);

			if (ret < 0)
				return ret;

			codec_port_old = codec_port;
		}
	}

	return 0;
}

static int graph_parse_of(struct asoc_simple_priv *priv)
{
	struct snd_soc_card *card = simple_priv_to_card(priv);
	struct link_info li;
	int ret;

	ret = asoc_simple_parse_widgets(card, NULL);
	if (ret < 0)
		return ret;

	ret = asoc_simple_parse_routing(card, NULL);
	if (ret < 0)
		return ret;

	memset(&li, 0, sizeof(li));
	for (li.cpu = 1; li.cpu >= 0; li.cpu--) {
		/*
		 * Detect all CPU first, and Detect all Codec 2nd.
		 *
		 * In Normal sound case, all DAIs are detected
		 * as "CPU-Codec".
		 *
		 * In DPCM sound case,
		 * all CPUs   are detected as "CPU-dummy", and
		 * all Codecs are detected as "dummy-Codec".
		 * To avoid random sub-device numbering,
		 * detect "dummy-Codec" in last;
		 */
		ret = graph_for_each_link(priv, &li,
					  graph_dai_link_of,
					  graph_dai_link_of_dpcm);
		if (ret < 0)
			return ret;
	}

	return asoc_simple_parse_card_name(card, NULL);
}

static int graph_count_noml(struct asoc_simple_priv *priv,
			    struct device_node *cpu_ep,
			    struct device_node *codec_ep,
			    struct link_info *li)
{
	struct device *dev = simple_priv_to_dev(priv);

	li->link += 1; /* 1xCPU-Codec */
	li->dais += 2; /* 1xCPU + 1xCodec */

	dev_dbg(dev, "Count As Normal\n");

	return 0;
}

static int graph_count_dpcm(struct asoc_simple_priv *priv,
			    struct device_node *cpu_ep,
			    struct device_node *codec_ep,
			    struct link_info *li,
			    int dup_codec)
{
	struct device *dev = simple_priv_to_dev(priv);

	li->link++; /* 1xCPU-dummy */
	li->dais++; /* 1xCPU */

	if (!dup_codec) {
		li->link++; /* 1xdummy-Codec */
		li->conf++; /* 1xdummy-Codec */
		li->dais++; /* 1xCodec */
	}

	dev_dbg(dev, "Count As DPCM\n");

	return 0;
}

static void graph_get_dais_count(struct asoc_simple_priv *priv,
				 struct link_info *li)
{
	struct device *dev = simple_priv_to_dev(priv);

	/*
	 * link_num :	number of links.
	 *		CPU-Codec / CPU-dummy / dummy-Codec
	 * dais_num :	number of DAIs
	 * ccnf_num :	number of codec_conf
	 *		same number for "dummy-Codec"
	 *
	 * ex1)
	 * CPU0 --- Codec0	link : 5
	 * CPU1 --- Codec1	dais : 7
	 * CPU2 -/		ccnf : 1
	 * CPU3 --- Codec2
	 *
	 *	=> 5 links = 2xCPU-Codec + 2xCPU-dummy + 1xdummy-Codec
	 *	=> 7 DAIs  = 4xCPU + 3xCodec
	 *	=> 1 ccnf  = 1xdummy-Codec
	 *
	 * ex2)
	 * CPU0 --- Codec0	link : 5
	 * CPU1 --- Codec1	dais : 6
	 * CPU2 -/		ccnf : 1
	 * CPU3 -/
	 *
	 *	=> 5 links = 1xCPU-Codec + 3xCPU-dummy + 1xdummy-Codec
	 *	=> 6 DAIs  = 4xCPU + 2xCodec
	 *	=> 1 ccnf  = 1xdummy-Codec
	 *
	 * ex3)
	 * CPU0 --- Codec0	link : 6
	 * CPU1 -/		dais : 6
	 * CPU2 --- Codec1	ccnf : 2
	 * CPU3 -/
	 *
	 *	=> 6 links = 0xCPU-Codec + 4xCPU-dummy + 2xdummy-Codec
	 *	=> 6 DAIs  = 4xCPU + 2xCodec
	 *	=> 2 ccnf  = 2xdummy-Codec
	 *
	 * ex4)
	 * CPU0 --- Codec0 (convert-rate)	link : 3
	 * CPU1 --- Codec1			dais : 4
	 *					ccnf : 1
	 *
	 *	=> 3 links = 1xCPU-Codec + 1xCPU-dummy + 1xdummy-Codec
	 *	=> 4 DAIs  = 2xCPU + 2xCodec
	 *	=> 1 ccnf  = 1xdummy-Codec
	 */
	graph_for_each_link(priv, li,
			    graph_count_noml,
			    graph_count_dpcm);
	dev_dbg(dev, "link %d, dais %d, ccnf %d\n",
		li->link, li->dais, li->conf);
}

static int graph_card_probe(struct snd_soc_card *card)
{
	struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(card);
	int ret;

	ret = asoc_simple_init_hp(card, &priv->hp_jack, NULL);
	if (ret < 0)
		return ret;

	ret = asoc_simple_init_mic(card, &priv->mic_jack, NULL);
	if (ret < 0)
		return ret;

	return 0;
}

static int graph_probe(struct platform_device *pdev)
{
	struct asoc_simple_priv *priv;
	struct device *dev = &pdev->dev;
	struct snd_soc_card *card;
	struct link_info li;
	int ret;

	/* Allocate the private data and the DAI link array */
	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	card = simple_priv_to_card(priv);
	card->owner		= THIS_MODULE;
	card->dev		= dev;
	card->dapm_widgets	= graph_dapm_widgets;
	card->num_dapm_widgets	= ARRAY_SIZE(graph_dapm_widgets);
	card->probe		= graph_card_probe;

	memset(&li, 0, sizeof(li));
	graph_get_dais_count(priv, &li);
	if (!li.link || !li.dais)
		return -EINVAL;

	ret = asoc_simple_init_priv(priv, &li);
	if (ret < 0)
		return ret;

	priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
	if (IS_ERR(priv->pa_gpio)) {
		ret = PTR_ERR(priv->pa_gpio);
		dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
		return ret;
	}

	ret = graph_parse_of(priv);
	if (ret < 0) {
		if (ret != -EPROBE_DEFER)
			dev_err(dev, "parse error %d\n", ret);
		goto err;
	}

	snd_soc_card_set_drvdata(card, priv);

	asoc_simple_debug_info(priv);

	ret = devm_snd_soc_register_card(dev, card);
	if (ret < 0)
		goto err;

	return 0;
err:
	asoc_simple_clean_reference(card);

	return ret;
}

static int graph_remove(struct platform_device *pdev)
{
	struct snd_soc_card *card = platform_get_drvdata(pdev);

	return asoc_simple_clean_reference(card);
}

static const struct of_device_id graph_of_match[] = {
	{ .compatible = "audio-graph-card", },
	{ .compatible = "audio-graph-scu-card",
	  .data = (void *)DPCM_SELECTABLE },
	{},
};
MODULE_DEVICE_TABLE(of, graph_of_match);

static struct platform_driver graph_card = {
	.driver = {
		.name = "asoc-audio-graph-card",
		.pm = &snd_soc_pm_ops,
		.of_match_table = graph_of_match,
	},
	.probe = graph_probe,
	.remove = graph_remove,
};
module_platform_driver(graph_card);

MODULE_ALIAS("platform:asoc-audio-graph-card");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ASoC Audio Graph Sound Card");
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");