sound/soc/generic/audio-graph-scu-card.c - linux-mtk - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 //
 // ASoC audio graph SCU sound card support
 //
 // Copyright (C) 2017 Renesas Solutions Corp.
 // Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 //
 // based on
 //	${LINUX}/sound/soc/generic/simple-scu-card.c
 //	${LINUX}/sound/soc/generic/audio-graph-card.c

 #include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/gpio.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/jack.h>
 #include <sound/simple_card_utils.h>

 struct graph_card_data {
 	struct snd_soc_card snd_card;
 	struct snd_soc_codec_conf codec_conf;
 	struct asoc_simple_dai *dai_props;
 	struct snd_soc_dai_link *dai_link;
 	struct asoc_simple_card_data adata;
 };

 #define graph_priv_to_card(priv) (&(priv)->snd_card)
 #define graph_priv_to_props(priv, i) ((priv)->dai_props + (i))
 #define graph_priv_to_dev(priv) (graph_priv_to_card(priv)->dev)
 #define graph_priv_to_link(priv, i) (graph_priv_to_card(priv)->dai_link + (i))

 static int asoc_graph_card_startup(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
 	struct asoc_simple_dai *dai_props = graph_priv_to_props(priv, rtd->num);

 	return asoc_simple_card_clk_enable(dai_props);
 }

 static void asoc_graph_card_shutdown(struct snd_pcm_substream *substream)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
 	struct asoc_simple_dai *dai_props = graph_priv_to_props(priv, rtd->num);

 	asoc_simple_card_clk_disable(dai_props);
 }

 static const struct snd_soc_ops asoc_graph_card_ops = {
 	.startup = asoc_graph_card_startup,
 	.shutdown = asoc_graph_card_shutdown,
 };

 static int asoc_graph_card_dai_init(struct snd_soc_pcm_runtime *rtd)
 {
 	struct graph_card_data *priv =	snd_soc_card_get_drvdata(rtd->card);
 	struct snd_soc_dai *dai;
 	struct snd_soc_dai_link *dai_link;
 	struct asoc_simple_dai *dai_props;
 	int num = rtd->num;

 	dai_link	= graph_priv_to_link(priv, num);
 	dai_props	= graph_priv_to_props(priv, num);
 	dai		= dai_link->dynamic ?
 				rtd->cpu_dai :
 				rtd->codec_dai;

 	return asoc_simple_card_init_dai(dai, dai_props);
 }

 static int asoc_graph_card_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
 					       struct snd_pcm_hw_params *params)
 {
 	struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card);

 	asoc_simple_card_convert_fixup(&priv->adata, params);

 	return 0;
 }

 static int asoc_graph_card_dai_link_of(struct device_node *ep,
 				       struct graph_card_data *priv,
 				       unsigned int daifmt,
 				       int idx, int is_fe)
 {
 	struct device *dev = graph_priv_to_dev(priv);
 	struct snd_soc_dai_link *dai_link = graph_priv_to_link(priv, idx);
 	struct asoc_simple_dai *dai_props = graph_priv_to_props(priv, idx);
 	struct snd_soc_card *card = graph_priv_to_card(priv);
 	int ret;

 	if (is_fe) {
 		/* BE is dummy */
 		dai_link->codec_of_node		= NULL;
 		dai_link->codec_dai_name	= "snd-soc-dummy-dai";
 		dai_link->codec_name		= "snd-soc-dummy";

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

 		ret = asoc_simple_card_parse_graph_cpu(ep, dai_link);
 		if (ret)
 			return ret;

 		ret = asoc_simple_card_parse_clk_cpu(dev, ep, dai_link, dai_props);
 		if (ret < 0)
 			return ret;

 		ret = asoc_simple_card_set_dailink_name(dev, dai_link,
 							"fe.%s",
 							dai_link->cpu_dai_name);
 		if (ret < 0)
 			return ret;

 		/* card->num_links includes Codec */
 		asoc_simple_card_canonicalize_cpu(dai_link,
 			of_graph_get_endpoint_count(dai_link->cpu_of_node) == 1);
 	} else {
 		/* FE is dummy */
 		dai_link->cpu_of_node		= NULL;
 		dai_link->cpu_dai_name		= "snd-soc-dummy-dai";
 		dai_link->cpu_name		= "snd-soc-dummy";

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

 		ret = asoc_simple_card_parse_graph_codec(ep, dai_link);
 		if (ret < 0)
 			return ret;

 		ret = asoc_simple_card_parse_clk_codec(dev, ep, dai_link, dai_props);
 		if (ret < 0)
 			return ret;

 		ret = asoc_simple_card_set_dailink_name(dev, dai_link,
 							"be.%s",
 							dai_link->codec_dai_name);
 		if (ret < 0)
 			return ret;

 		snd_soc_of_parse_audio_prefix(card,
 					      &priv->codec_conf,
 					      dai_link->codec_of_node,
 					      "prefix");
 	}

 	ret = asoc_simple_card_of_parse_tdm(ep, dai_props);
 	if (ret)
 		return ret;

 	ret = asoc_simple_card_canonicalize_dailink(dai_link);
 	if (ret < 0)
 		return ret;

 	dai_link->dai_fmt		= daifmt;
 	dai_link->dpcm_playback		= 1;
 	dai_link->dpcm_capture		= 1;
 	dai_link->ops			= &asoc_graph_card_ops;
 	dai_link->init			= asoc_graph_card_dai_init;

 	return 0;
 }

 static int asoc_graph_card_parse_of(struct graph_card_data *priv)
 {
 	struct of_phandle_iterator it;
 	struct device *dev = graph_priv_to_dev(priv);
 	struct snd_soc_card *card = graph_priv_to_card(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 *rcpu_ep;
 	struct device_node *codec_port;
 	struct device_node *codec_port_old;
 	unsigned int daifmt = 0;
 	int dai_idx, ret;
 	int rc, codec;

 	if (!node)
 		return -EINVAL;

 	/*
 	 * we need to consider "widgets", "mclk-fs" around here
 	 * see simple-card
 	 */

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

 	asoc_simple_card_parse_convert(dev, NULL, &priv->adata);

 	/*
 	 * it supports multi CPU, single CODEC only here
 	 * see asoc_graph_get_dais_count
 	 */

 	/* find 1st codec */
 	of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
 		cpu_port = it.node;
 		cpu_ep   = of_get_next_child(cpu_port, NULL);
 		codec_ep = of_graph_get_remote_endpoint(cpu_ep);
 		rcpu_ep  = of_graph_get_remote_endpoint(codec_ep);

 		of_node_put(cpu_ep);
 		of_node_put(codec_ep);
 		of_node_put(rcpu_ep);

 		if (!codec_ep)
 			continue;

 		if (rcpu_ep != cpu_ep) {
 			dev_err(dev, "remote-endpoint missmatch (%s/%s/%s)\n",
 				cpu_ep->name, codec_ep->name, rcpu_ep->name);
 			ret = -EINVAL;
 			goto parse_of_err;
 		}

 		ret = asoc_simple_card_parse_daifmt(dev, cpu_ep, codec_ep,
 							    NULL, &daifmt);
 		if (ret < 0) {
 			of_node_put(cpu_port);
 			goto parse_of_err;
 		}
 	}

 	dai_idx = 0;
 	codec_port_old = NULL;
 	for (codec = 0; codec < 2; codec++) {
 		/*
 		 * To listup valid sounds continuously,
 		 * detect all CPU-dummy first, and
 		 * detect all dummy-Codec second
 		 */
 		of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
 			cpu_port = it.node;
 			cpu_ep   = of_get_next_child(cpu_port, NULL);
 			codec_ep = of_graph_get_remote_endpoint(cpu_ep);
 			codec_port = of_graph_get_port_parent(codec_ep);

 			of_node_put(cpu_ep);
 			of_node_put(codec_ep);
 			of_node_put(codec_port);

 			if (codec) {
 				if (!codec_port)
 					continue;

 				if (codec_port_old == codec_port)
 					continue;

 				codec_port_old = codec_port;

 				/* Back-End (= Codec) */
 				ret = asoc_graph_card_dai_link_of(codec_ep, priv, daifmt, dai_idx++, 0);
 				if (ret < 0) {
 					of_node_put(cpu_port);
 					goto parse_of_err;
 				}
 			} else {
 				/* Front-End (= CPU) */
 				ret = asoc_graph_card_dai_link_of(cpu_ep, priv, daifmt, dai_idx++, 1);
 				if (ret < 0) {
 					of_node_put(cpu_port);
 					goto parse_of_err;
 				}
 			}
 		}
 	}

 	ret = asoc_simple_card_parse_card_name(card, NULL);
 	if (ret)
 		goto parse_of_err;

 	ret = 0;

 parse_of_err:
 	return ret;
 }

 static int asoc_graph_get_dais_count(struct device *dev)
 {
 	struct of_phandle_iterator it;
 	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;
 	int count = 0;
 	int rc;

 	codec_port_old = NULL;
 	of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
 		cpu_port = it.node;
 		cpu_ep   = of_get_next_child(cpu_port, NULL);
 		codec_ep = of_graph_get_remote_endpoint(cpu_ep);
 		codec_port = of_graph_get_port_parent(codec_ep);

 		of_node_put(cpu_ep);
 		of_node_put(codec_ep);
 		of_node_put(codec_port);

 		if (cpu_ep)
 			count++;

 		if (!codec_port)
 			continue;

 		if (codec_port_old == codec_port)
 			continue;

 		count++;
 		codec_port_old = codec_port;
 	}

 	return count;
 }

 static int asoc_graph_card_probe(struct platform_device *pdev)
 {
 	struct graph_card_data *priv;
 	struct snd_soc_dai_link *dai_link;
 	struct asoc_simple_dai *dai_props;
 	struct device *dev = &pdev->dev;
 	struct snd_soc_card *card;
 	int num, ret;

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

 	num = asoc_graph_get_dais_count(dev);
 	if (num == 0)
 		return -EINVAL;

 	dai_props = devm_kcalloc(dev, num, sizeof(*dai_props), GFP_KERNEL);
 	dai_link  = devm_kcalloc(dev, num, sizeof(*dai_link), GFP_KERNEL);
 	if (!dai_props || !dai_link)
 		return -ENOMEM;

 	priv->dai_props			= dai_props;
 	priv->dai_link			= dai_link;

 	/* Init snd_soc_card */
 	card = graph_priv_to_card(priv);
 	card->owner		= THIS_MODULE;
 	card->dev		= dev;
 	card->dai_link		= priv->dai_link;
 	card->num_links		= num;
 	card->codec_conf	= &priv->codec_conf;
 	card->num_configs	= 1;

 	ret = asoc_graph_card_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);

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

 	return 0;
 err:
 	asoc_simple_card_clean_reference(card);

 	return ret;
 }

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

 	return asoc_simple_card_clean_reference(card);
 }

 static const struct of_device_id asoc_graph_of_match[] = {
 	{ .compatible = "audio-graph-scu-card", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, asoc_graph_of_match);

 static struct platform_driver asoc_graph_card = {
 	.driver = {
 		.name = "asoc-audio-graph-scu-card",
 		.pm = &snd_soc_pm_ops,
 		.of_match_table = asoc_graph_of_match,
 	},
 	.probe = asoc_graph_card_probe,
 	.remove = asoc_graph_card_remove,
 };
 module_platform_driver(asoc_graph_card);

 MODULE_ALIAS("platform:asoc-audio-graph-scu-card");
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("ASoC Audio Graph SCU Sound Card");
 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
	// SPDX-License-Identifier: GPL-2.0
	//
	// ASoC audio graph SCU sound card support
	//
	// Copyright (C) 2017 Renesas Solutions Corp.
	// Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
	//
	// based on
	// ${LINUX}/sound/soc/generic/simple-scu-card.c
	// ${LINUX}/sound/soc/generic/audio-graph-card.c

	#include <linux/clk.h>
	#include <linux/device.h>
	#include <linux/gpio.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/jack.h>
	#include <sound/simple_card_utils.h>

	struct graph_card_data {
	struct snd_soc_card snd_card;
	struct snd_soc_codec_conf codec_conf;
	struct asoc_simple_dai *dai_props;
	struct snd_soc_dai_link *dai_link;
	struct asoc_simple_card_data adata;
	};

	#define graph_priv_to_card(priv) (&(priv)->snd_card)
	#define graph_priv_to_props(priv, i) ((priv)->dai_props + (i))
	#define graph_priv_to_dev(priv) (graph_priv_to_card(priv)->dev)
	#define graph_priv_to_link(priv, i) (graph_priv_to_card(priv)->dai_link + (i))

	static int asoc_graph_card_startup(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
	struct asoc_simple_dai *dai_props = graph_priv_to_props(priv, rtd->num);

	return asoc_simple_card_clk_enable(dai_props);
	}

	static void asoc_graph_card_shutdown(struct snd_pcm_substream *substream)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
	struct asoc_simple_dai *dai_props = graph_priv_to_props(priv, rtd->num);

	asoc_simple_card_clk_disable(dai_props);
	}

	static const struct snd_soc_ops asoc_graph_card_ops = {
	.startup = asoc_graph_card_startup,
	.shutdown = asoc_graph_card_shutdown,
	};

	static int asoc_graph_card_dai_init(struct snd_soc_pcm_runtime *rtd)
	{
	struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
	struct snd_soc_dai *dai;
	struct snd_soc_dai_link *dai_link;
	struct asoc_simple_dai *dai_props;
	int num = rtd->num;

	dai_link = graph_priv_to_link(priv, num);
	dai_props = graph_priv_to_props(priv, num);
	dai = dai_link->dynamic ?
	rtd->cpu_dai :
	rtd->codec_dai;

	return asoc_simple_card_init_dai(dai, dai_props);
	}

	static int asoc_graph_card_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
	struct snd_pcm_hw_params *params)
	{
	struct graph_card_data *priv = snd_soc_card_get_drvdata(rtd->card);

	asoc_simple_card_convert_fixup(&priv->adata, params);

	return 0;
	}

	static int asoc_graph_card_dai_link_of(struct device_node *ep,
	struct graph_card_data *priv,
	unsigned int daifmt,
	int idx, int is_fe)
	{
	struct device *dev = graph_priv_to_dev(priv);
	struct snd_soc_dai_link *dai_link = graph_priv_to_link(priv, idx);
	struct asoc_simple_dai *dai_props = graph_priv_to_props(priv, idx);
	struct snd_soc_card *card = graph_priv_to_card(priv);
	int ret;

	if (is_fe) {
	/* BE is dummy */
	dai_link->codec_of_node = NULL;
	dai_link->codec_dai_name = "snd-soc-dummy-dai";
	dai_link->codec_name = "snd-soc-dummy";

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

	ret = asoc_simple_card_parse_graph_cpu(ep, dai_link);
	if (ret)
	return ret;

	ret = asoc_simple_card_parse_clk_cpu(dev, ep, dai_link, dai_props);
	if (ret < 0)
	return ret;

	ret = asoc_simple_card_set_dailink_name(dev, dai_link,
	"fe.%s",
	dai_link->cpu_dai_name);
	if (ret < 0)
	return ret;

	/* card->num_links includes Codec */
	asoc_simple_card_canonicalize_cpu(dai_link,
	of_graph_get_endpoint_count(dai_link->cpu_of_node) == 1);
	} else {
	/* FE is dummy */
	dai_link->cpu_of_node = NULL;
	dai_link->cpu_dai_name = "snd-soc-dummy-dai";
	dai_link->cpu_name = "snd-soc-dummy";

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

	ret = asoc_simple_card_parse_graph_codec(ep, dai_link);
	if (ret < 0)
	return ret;

	ret = asoc_simple_card_parse_clk_codec(dev, ep, dai_link, dai_props);
	if (ret < 0)
	return ret;

	ret = asoc_simple_card_set_dailink_name(dev, dai_link,
	"be.%s",
	dai_link->codec_dai_name);
	if (ret < 0)
	return ret;

	snd_soc_of_parse_audio_prefix(card,
	&priv->codec_conf,
	dai_link->codec_of_node,
	"prefix");
	}

	ret = asoc_simple_card_of_parse_tdm(ep, dai_props);
	if (ret)
	return ret;

	ret = asoc_simple_card_canonicalize_dailink(dai_link);
	if (ret < 0)
	return ret;

	dai_link->dai_fmt = daifmt;
	dai_link->dpcm_playback = 1;
	dai_link->dpcm_capture = 1;
	dai_link->ops = &asoc_graph_card_ops;
	dai_link->init = asoc_graph_card_dai_init;

	return 0;
	}

	static int asoc_graph_card_parse_of(struct graph_card_data *priv)
	{
	struct of_phandle_iterator it;
	struct device *dev = graph_priv_to_dev(priv);
	struct snd_soc_card *card = graph_priv_to_card(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 *rcpu_ep;
	struct device_node *codec_port;
	struct device_node *codec_port_old;
	unsigned int daifmt = 0;
	int dai_idx, ret;
	int rc, codec;

	if (!node)
	return -EINVAL;

	/*
	* we need to consider "widgets", "mclk-fs" around here
	* see simple-card
	*/

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

	asoc_simple_card_parse_convert(dev, NULL, &priv->adata);

	/*
	* it supports multi CPU, single CODEC only here
	* see asoc_graph_get_dais_count
	*/

	/* find 1st codec */
	of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
	cpu_port = it.node;
	cpu_ep = of_get_next_child(cpu_port, NULL);
	codec_ep = of_graph_get_remote_endpoint(cpu_ep);
	rcpu_ep = of_graph_get_remote_endpoint(codec_ep);

	of_node_put(cpu_ep);
	of_node_put(codec_ep);
	of_node_put(rcpu_ep);

	if (!codec_ep)
	continue;

	if (rcpu_ep != cpu_ep) {
	dev_err(dev, "remote-endpoint missmatch (%s/%s/%s)\n",
	cpu_ep->name, codec_ep->name, rcpu_ep->name);
	ret = -EINVAL;
	goto parse_of_err;
	}

	ret = asoc_simple_card_parse_daifmt(dev, cpu_ep, codec_ep,
	NULL, &daifmt);
	if (ret < 0) {
	of_node_put(cpu_port);
	goto parse_of_err;
	}
	}

	dai_idx = 0;
	codec_port_old = NULL;
	for (codec = 0; codec < 2; codec++) {
	/*
	* To listup valid sounds continuously,
	* detect all CPU-dummy first, and
	* detect all dummy-Codec second
	*/
	of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
	cpu_port = it.node;
	cpu_ep = of_get_next_child(cpu_port, NULL);
	codec_ep = of_graph_get_remote_endpoint(cpu_ep);
	codec_port = of_graph_get_port_parent(codec_ep);

	of_node_put(cpu_ep);
	of_node_put(codec_ep);
	of_node_put(codec_port);

	if (codec) {
	if (!codec_port)
	continue;

	if (codec_port_old == codec_port)
	continue;

	codec_port_old = codec_port;

	/* Back-End (= Codec) */
	ret = asoc_graph_card_dai_link_of(codec_ep, priv, daifmt, dai_idx++, 0);
	if (ret < 0) {
	of_node_put(cpu_port);
	goto parse_of_err;
	}
	} else {
	/* Front-End (= CPU) */
	ret = asoc_graph_card_dai_link_of(cpu_ep, priv, daifmt, dai_idx++, 1);
	if (ret < 0) {
	of_node_put(cpu_port);
	goto parse_of_err;
	}
	}
	}
	}

	ret = asoc_simple_card_parse_card_name(card, NULL);
	if (ret)
	goto parse_of_err;

	ret = 0;

	parse_of_err:
	return ret;
	}

	static int asoc_graph_get_dais_count(struct device *dev)
	{
	struct of_phandle_iterator it;
	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;
	int count = 0;
	int rc;

	codec_port_old = NULL;
	of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
	cpu_port = it.node;
	cpu_ep = of_get_next_child(cpu_port, NULL);
	codec_ep = of_graph_get_remote_endpoint(cpu_ep);
	codec_port = of_graph_get_port_parent(codec_ep);

	of_node_put(cpu_ep);
	of_node_put(codec_ep);
	of_node_put(codec_port);

	if (cpu_ep)
	count++;

	if (!codec_port)
	continue;

	if (codec_port_old == codec_port)
	continue;

	count++;
	codec_port_old = codec_port;
	}

	return count;
	}

	static int asoc_graph_card_probe(struct platform_device *pdev)
	{
	struct graph_card_data *priv;
	struct snd_soc_dai_link *dai_link;
	struct asoc_simple_dai *dai_props;
	struct device *dev = &pdev->dev;
	struct snd_soc_card *card;
	int num, ret;

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

	num = asoc_graph_get_dais_count(dev);
	if (num == 0)
	return -EINVAL;

	dai_props = devm_kcalloc(dev, num, sizeof(*dai_props), GFP_KERNEL);
	dai_link = devm_kcalloc(dev, num, sizeof(*dai_link), GFP_KERNEL);
	if (!dai_props \|\| !dai_link)
	return -ENOMEM;

	priv->dai_props = dai_props;
	priv->dai_link = dai_link;

	/* Init snd_soc_card */
	card = graph_priv_to_card(priv);
	card->owner = THIS_MODULE;
	card->dev = dev;
	card->dai_link = priv->dai_link;
	card->num_links = num;
	card->codec_conf = &priv->codec_conf;
	card->num_configs = 1;

	ret = asoc_graph_card_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);

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

	return 0;
	err:
	asoc_simple_card_clean_reference(card);

	return ret;
	}

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

	return asoc_simple_card_clean_reference(card);
	}

	static const struct of_device_id asoc_graph_of_match[] = {
	{ .compatible = "audio-graph-scu-card", },
	{},
	};
	MODULE_DEVICE_TABLE(of, asoc_graph_of_match);

	static struct platform_driver asoc_graph_card = {
	.driver = {
	.name = "asoc-audio-graph-scu-card",
	.pm = &snd_soc_pm_ops,
	.of_match_table = asoc_graph_of_match,
	},
	.probe = asoc_graph_card_probe,
	.remove = asoc_graph_card_remove,
	};
	module_platform_driver(asoc_graph_card);

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