sound/soc/generic/simple-card.c - maze/linux - Git at Google

 /*
  * ASoC simple sound card support
  *
  * Copyright (C) 2012 Renesas Solutions Corp.
  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
 #include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/string.h>
 #include <sound/simple_card.h>
 #include <sound/soc-dai.h>
 #include <sound/soc.h>

 struct simple_card_data {
 	struct snd_soc_card snd_card;
 	struct simple_dai_props {
 		struct asoc_simple_dai cpu_dai;
 		struct asoc_simple_dai codec_dai;
 	} *dai_props;
 	struct snd_soc_dai_link dai_link[];	/* dynamically allocated */
 };

 static int __asoc_simple_card_dai_init(struct snd_soc_dai *dai,
 				       struct asoc_simple_dai *set)
 {
 	int ret;

 	if (set->fmt) {
 		ret = snd_soc_dai_set_fmt(dai, set->fmt);
 		if (ret && ret != -ENOTSUPP) {
 			dev_err(dai->dev, "simple-card: set_fmt error\n");
 			goto err;
 		}
 	}

 	if (set->sysclk) {
 		ret = snd_soc_dai_set_sysclk(dai, 0, set->sysclk, 0);
 		if (ret && ret != -ENOTSUPP) {
 			dev_err(dai->dev, "simple-card: set_sysclk error\n");
 			goto err;
 		}
 	}

 	if (set->slots) {
 		ret = snd_soc_dai_set_tdm_slot(dai, 0, 0,
 						set->slots,
 						set->slot_width);
 		if (ret && ret != -ENOTSUPP) {
 			dev_err(dai->dev, "simple-card: set_tdm_slot error\n");
 			goto err;
 		}
 	}

 	ret = 0;

 err:
 	return ret;
 }

 static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
 {
 	struct simple_card_data *priv =
 				snd_soc_card_get_drvdata(rtd->card);
 	struct snd_soc_dai *codec = rtd->codec_dai;
 	struct snd_soc_dai *cpu = rtd->cpu_dai;
 	struct simple_dai_props *dai_props;
 	int num, ret;

 	num = rtd - rtd->card->rtd;
 	dai_props = &priv->dai_props[num];
 	ret = __asoc_simple_card_dai_init(codec, &dai_props->codec_dai);
 	if (ret < 0)
 		return ret;

 	ret = __asoc_simple_card_dai_init(cpu, &dai_props->cpu_dai);
 	if (ret < 0)
 		return ret;

 	return 0;
 }

 static int
 asoc_simple_card_sub_parse_of(struct device_node *np,
 			      unsigned int daifmt,
 			      struct asoc_simple_dai *dai,
 			      const struct device_node **p_node,
 			      const char **name)
 {
 	struct device_node *node;
 	struct clk *clk;
 	int ret;

 	/*
 	 * get node via "sound-dai = <&phandle port>"
 	 * it will be used as xxx_of_node on soc_bind_dai_link()
 	 */
 	node = of_parse_phandle(np, "sound-dai", 0);
 	if (!node)
 		return -ENODEV;
 	*p_node = node;

 	/* get dai->name */
 	ret = snd_soc_of_get_dai_name(np, name);
 	if (ret < 0)
 		return ret;

 	/* parse TDM slot */
 	ret = snd_soc_of_parse_tdm_slot(np, &dai->slots, &dai->slot_width);
 	if (ret)
 		return ret;

 	/*
 	 * bitclock-inversion, frame-inversion
 	 * bitclock-master,    frame-master
 	 * and specific "format" if it has
 	 */
 	dai->fmt = snd_soc_of_parse_daifmt(np, NULL);
 	dai->fmt |= daifmt;

 	/*
 	 * dai->sysclk come from
 	 *  "clocks = <&xxx>" (if system has common clock)
 	 *  or "system-clock-frequency = <xxx>"
 	 *  or device's module clock.
 	 */
 	if (of_property_read_bool(np, "clocks")) {
 		clk = of_clk_get(np, 0);
 		if (IS_ERR(clk)) {
 			ret = PTR_ERR(clk);
 			return ret;
 		}

 		dai->sysclk = clk_get_rate(clk);
 	} else if (of_property_read_bool(np, "system-clock-frequency")) {
 		of_property_read_u32(np,
 				     "system-clock-frequency",
 				     &dai->sysclk);
 	} else {
 		clk = of_clk_get(node, 0);
 		if (!IS_ERR(clk))
 			dai->sysclk = clk_get_rate(clk);
 	}

 	return 0;
 }

 static int simple_card_cpu_codec_of(struct device_node *node,
 				int daifmt,
 				struct snd_soc_dai_link *dai_link,
 				struct simple_dai_props *dai_props)
 {
 	struct device_node *np;
 	int ret;

 	/* CPU sub-node */
 	ret = -EINVAL;
 	np = of_get_child_by_name(node, "simple-audio-card,cpu");
 	if (np) {
 		ret = asoc_simple_card_sub_parse_of(np, daifmt,
 						&dai_props->cpu_dai,
 						&dai_link->cpu_of_node,
 						&dai_link->cpu_dai_name);
 		of_node_put(np);
 	}
 	if (ret < 0)
 		return ret;

 	/* CODEC sub-node */
 	ret = -EINVAL;
 	np = of_get_child_by_name(node, "simple-audio-card,codec");
 	if (np) {
 		ret = asoc_simple_card_sub_parse_of(np, daifmt,
 						&dai_props->codec_dai,
 						&dai_link->codec_of_node,
 						&dai_link->codec_dai_name);
 		of_node_put(np);
 	}
 	return ret;
 }

 static int asoc_simple_card_parse_of(struct device_node *node,
 				     struct simple_card_data *priv,
 				     struct device *dev,
 				     int multi)
 {
 	struct snd_soc_dai_link *dai_link = priv->snd_card.dai_link;
 	struct simple_dai_props *dai_props = priv->dai_props;
 	struct device_node *np;
 	char *name;
 	unsigned int daifmt;
 	int ret;

 	/* parsing the card name from DT */
 	snd_soc_of_parse_card_name(&priv->snd_card, "simple-audio-card,name");

 	/* get CPU/CODEC common format via simple-audio-card,format */
 	daifmt = snd_soc_of_parse_daifmt(node, "simple-audio-card,") &
 		(SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK);

 	/* off-codec widgets */
 	if (of_property_read_bool(node, "simple-audio-card,widgets")) {
 		ret = snd_soc_of_parse_audio_simple_widgets(&priv->snd_card,
 					"simple-audio-card,widgets");
 		if (ret)
 			return ret;
 	}

 	/* DAPM routes */
 	if (of_property_read_bool(node, "simple-audio-card,routing")) {
 		ret = snd_soc_of_parse_audio_routing(&priv->snd_card,
 					"simple-audio-card,routing");
 		if (ret)
 			return ret;
 	}

 	/* loop on the DAI links */
 	np = NULL;
 	for (;;) {
 		if (multi) {
 			np = of_get_next_child(node, np);
 			if (!np)
 				break;
 		}

 		ret = simple_card_cpu_codec_of(multi ? np : node,
 					daifmt, dai_link, dai_props);
 		if (ret < 0)
 			goto err;

 		/*
 		 * overwrite cpu_dai->fmt as its DAIFMT_MASTER bit is based on CODEC
 		 * while the other bits should be identical unless buggy SW/HW design.
 		 */
 		dai_props->cpu_dai.fmt = dai_props->codec_dai.fmt;

 		if (!dai_link->cpu_dai_name || !dai_link->codec_dai_name) {
 			ret = -EINVAL;
 			goto err;
 		}

 		/* simple-card assumes platform == cpu */
 		dai_link->platform_of_node = dai_link->cpu_of_node;

 		name = devm_kzalloc(dev,
 				    strlen(dai_link->cpu_dai_name)   +
 				    strlen(dai_link->codec_dai_name) + 2,
 				    GFP_KERNEL);
 		sprintf(name, "%s-%s", dai_link->cpu_dai_name,
 					dai_link->codec_dai_name);
 		dai_link->name = dai_link->stream_name = name;

 		if (!multi)
 			break;

 		dai_link++;
 		dai_props++;
 	}

 	/* card name is created from CPU/CODEC dai name */
 	dai_link = priv->snd_card.dai_link;
 	if (!priv->snd_card.name)
 		priv->snd_card.name = dai_link->name;

 	dev_dbg(dev, "card-name : %s\n", priv->snd_card.name);
 	dev_dbg(dev, "platform : %04x\n", daifmt);
 	dai_props = priv->dai_props;
 	dev_dbg(dev, "cpu : %s / %04x / %d\n",
 		dai_link->cpu_dai_name,
 		dai_props->cpu_dai.fmt,
 		dai_props->cpu_dai.sysclk);
 	dev_dbg(dev, "codec : %s / %04x / %d\n",
 		dai_link->codec_dai_name,
 		dai_props->codec_dai.fmt,
 		dai_props->codec_dai.sysclk);

 	return 0;

 err:
 	of_node_put(np);
 	return ret;
 }

 /* update the reference count of the devices nodes at end of probe */
 static int asoc_simple_card_unref(struct platform_device *pdev)
 {
 	struct snd_soc_card *card = platform_get_drvdata(pdev);
 	struct snd_soc_dai_link *dai_link;
 	struct device_node *np;
 	int num_links;

 	for (num_links = 0, dai_link = card->dai_link;
 	     num_links < card->num_links;
 	     num_links++, dai_link++) {
 		np = (struct device_node *) dai_link->cpu_of_node;
 		if (np)
 			of_node_put(np);
 		np = (struct device_node *) dai_link->codec_of_node;
 		if (np)
 			of_node_put(np);
 	}
 	return 0;
 }

 static int asoc_simple_card_probe(struct platform_device *pdev)
 {
 	struct simple_card_data *priv;
 	struct snd_soc_dai_link *dai_link;
 	struct device_node *np = pdev->dev.of_node;
 	struct device *dev = &pdev->dev;
 	int num_links, multi, ret;

 	/* get the number of DAI links */
 	if (np && of_get_child_by_name(np, "simple-audio-card,dai-link")) {
 		num_links = of_get_child_count(np);
 		multi = 1;
 	} else {
 		num_links = 1;
 		multi = 0;
 	}

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

 	/*
 	 * init snd_soc_card
 	 */
 	priv->snd_card.owner = THIS_MODULE;
 	priv->snd_card.dev = dev;
 	dai_link = priv->dai_link;
 	priv->snd_card.dai_link = dai_link;
 	priv->snd_card.num_links = num_links;

 	/* get room for the other properties */
 	priv->dai_props = devm_kzalloc(dev,
 			sizeof(*priv->dai_props) * num_links,
 			GFP_KERNEL);
 	if (!priv->dai_props)
 		return -ENOMEM;

 	if (np && of_device_is_available(np)) {

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

 		/*
 		 * soc_bind_dai_link() will check cpu name
 		 * after of_node matching if dai_link has cpu_dai_name.
 		 * but, it will never match if name was created by fmt_single_name()
 		 * remove cpu_dai_name to escape name matching.
 		 * see
 		 *	fmt_single_name()
 		 *	fmt_multiple_name()
 		 */
 		if (num_links == 1)
 			dai_link->cpu_dai_name = NULL;

 	} else {
 		struct asoc_simple_card_info *cinfo;

 		cinfo = dev->platform_data;
 		if (!cinfo) {
 			dev_err(dev, "no info for asoc-simple-card\n");
 			return -EINVAL;
 		}

 		if (!cinfo->name	||
 		    !cinfo->codec_dai.name	||
 		    !cinfo->codec	||
 		    !cinfo->platform	||
 		    !cinfo->cpu_dai.name) {
 			dev_err(dev, "insufficient asoc_simple_card_info settings\n");
 			return -EINVAL;
 		}

 		priv->snd_card.name	= (cinfo->card) ? cinfo->card : cinfo->name;
 		dai_link->name		= cinfo->name;
 		dai_link->stream_name	= cinfo->name;
 		dai_link->platform_name	= cinfo->platform;
 		dai_link->codec_name	= cinfo->codec;
 		dai_link->cpu_dai_name	= cinfo->cpu_dai.name;
 		dai_link->codec_dai_name = cinfo->codec_dai.name;
 		memcpy(&priv->dai_props->cpu_dai, &cinfo->cpu_dai,
 					sizeof(priv->dai_props->cpu_dai));
 		memcpy(&priv->dai_props->codec_dai, &cinfo->codec_dai,
 					sizeof(priv->dai_props->codec_dai));

 		priv->dai_props->cpu_dai.fmt	|= cinfo->daifmt;
 		priv->dai_props->codec_dai.fmt	|= cinfo->daifmt;
 	}

 	/*
 	 * init snd_soc_dai_link
 	 */
 	dai_link->init = asoc_simple_card_dai_init;

 	snd_soc_card_set_drvdata(&priv->snd_card, priv);

 	ret = devm_snd_soc_register_card(&pdev->dev, &priv->snd_card);

 err:
 	asoc_simple_card_unref(pdev);
 	return ret;
 }

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

 static struct platform_driver asoc_simple_card = {
 	.driver = {
 		.name	= "asoc-simple-card",
 		.owner = THIS_MODULE,
 		.of_match_table = asoc_simple_of_match,
 	},
 	.probe		= asoc_simple_card_probe,
 };

 module_platform_driver(asoc_simple_card);

 MODULE_ALIAS("platform:asoc-simple-card");
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("ASoC Simple Sound Card");
 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
	/*
	* ASoC simple sound card support
	*
	* Copyright (C) 2012 Renesas Solutions Corp.
	* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/
	#include <linux/clk.h>
	#include <linux/device.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/string.h>
	#include <sound/simple_card.h>
	#include <sound/soc-dai.h>
	#include <sound/soc.h>

	struct simple_card_data {
	struct snd_soc_card snd_card;
	struct simple_dai_props {
	struct asoc_simple_dai cpu_dai;
	struct asoc_simple_dai codec_dai;
	} *dai_props;
	struct snd_soc_dai_link dai_link[]; /* dynamically allocated */
	};

	static int __asoc_simple_card_dai_init(struct snd_soc_dai *dai,
	struct asoc_simple_dai *set)
	{
	int ret;

	if (set->fmt) {
	ret = snd_soc_dai_set_fmt(dai, set->fmt);
	if (ret && ret != -ENOTSUPP) {
	dev_err(dai->dev, "simple-card: set_fmt error\n");
	goto err;
	}
	}

	if (set->sysclk) {
	ret = snd_soc_dai_set_sysclk(dai, 0, set->sysclk, 0);
	if (ret && ret != -ENOTSUPP) {
	dev_err(dai->dev, "simple-card: set_sysclk error\n");
	goto err;
	}
	}

	if (set->slots) {
	ret = snd_soc_dai_set_tdm_slot(dai, 0, 0,
	set->slots,
	set->slot_width);
	if (ret && ret != -ENOTSUPP) {
	dev_err(dai->dev, "simple-card: set_tdm_slot error\n");
	goto err;
	}
	}

	ret = 0;

	err:
	return ret;
	}

	static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
	{
	struct simple_card_data *priv =
	snd_soc_card_get_drvdata(rtd->card);
	struct snd_soc_dai *codec = rtd->codec_dai;
	struct snd_soc_dai *cpu = rtd->cpu_dai;
	struct simple_dai_props *dai_props;
	int num, ret;

	num = rtd - rtd->card->rtd;
	dai_props = &priv->dai_props[num];
	ret = __asoc_simple_card_dai_init(codec, &dai_props->codec_dai);
	if (ret < 0)
	return ret;

	ret = __asoc_simple_card_dai_init(cpu, &dai_props->cpu_dai);
	if (ret < 0)
	return ret;

	return 0;
	}

	static int
	asoc_simple_card_sub_parse_of(struct device_node *np,
	unsigned int daifmt,
	struct asoc_simple_dai *dai,
	const struct device_node **p_node,
	const char **name)
	{
	struct device_node *node;
	struct clk *clk;
	int ret;

	/*
	* get node via "sound-dai = <&phandle port>"
	* it will be used as xxx_of_node on soc_bind_dai_link()
	*/
	node = of_parse_phandle(np, "sound-dai", 0);
	if (!node)
	return -ENODEV;
	*p_node = node;

	/* get dai->name */
	ret = snd_soc_of_get_dai_name(np, name);
	if (ret < 0)
	return ret;

	/* parse TDM slot */
	ret = snd_soc_of_parse_tdm_slot(np, &dai->slots, &dai->slot_width);
	if (ret)
	return ret;

	/*
	* bitclock-inversion, frame-inversion
	* bitclock-master, frame-master
	* and specific "format" if it has
	*/
	dai->fmt = snd_soc_of_parse_daifmt(np, NULL);
	dai->fmt \|= daifmt;

	/*
	* dai->sysclk come from
	* "clocks = <&xxx>" (if system has common clock)
	* or "system-clock-frequency = <xxx>"
	* or device's module clock.
	*/
	if (of_property_read_bool(np, "clocks")) {
	clk = of_clk_get(np, 0);
	if (IS_ERR(clk)) {
	ret = PTR_ERR(clk);
	return ret;
	}

	dai->sysclk = clk_get_rate(clk);
	} else if (of_property_read_bool(np, "system-clock-frequency")) {
	of_property_read_u32(np,
	"system-clock-frequency",
	&dai->sysclk);
	} else {
	clk = of_clk_get(node, 0);
	if (!IS_ERR(clk))
	dai->sysclk = clk_get_rate(clk);
	}

	return 0;
	}

	static int simple_card_cpu_codec_of(struct device_node *node,
	int daifmt,
	struct snd_soc_dai_link *dai_link,
	struct simple_dai_props *dai_props)
	{
	struct device_node *np;
	int ret;

	/* CPU sub-node */
	ret = -EINVAL;
	np = of_get_child_by_name(node, "simple-audio-card,cpu");
	if (np) {
	ret = asoc_simple_card_sub_parse_of(np, daifmt,
	&dai_props->cpu_dai,
	&dai_link->cpu_of_node,
	&dai_link->cpu_dai_name);
	of_node_put(np);
	}
	if (ret < 0)
	return ret;

	/* CODEC sub-node */
	ret = -EINVAL;
	np = of_get_child_by_name(node, "simple-audio-card,codec");
	if (np) {
	ret = asoc_simple_card_sub_parse_of(np, daifmt,
	&dai_props->codec_dai,
	&dai_link->codec_of_node,
	&dai_link->codec_dai_name);
	of_node_put(np);
	}
	return ret;
	}

	static int asoc_simple_card_parse_of(struct device_node *node,
	struct simple_card_data *priv,
	struct device *dev,
	int multi)
	{
	struct snd_soc_dai_link *dai_link = priv->snd_card.dai_link;
	struct simple_dai_props *dai_props = priv->dai_props;
	struct device_node *np;
	char *name;
	unsigned int daifmt;
	int ret;

	/* parsing the card name from DT */
	snd_soc_of_parse_card_name(&priv->snd_card, "simple-audio-card,name");

	/* get CPU/CODEC common format via simple-audio-card,format */
	daifmt = snd_soc_of_parse_daifmt(node, "simple-audio-card,") &
	(SND_SOC_DAIFMT_FORMAT_MASK \| SND_SOC_DAIFMT_INV_MASK);

	/* off-codec widgets */
	if (of_property_read_bool(node, "simple-audio-card,widgets")) {
	ret = snd_soc_of_parse_audio_simple_widgets(&priv->snd_card,
	"simple-audio-card,widgets");
	if (ret)
	return ret;
	}

	/* DAPM routes */
	if (of_property_read_bool(node, "simple-audio-card,routing")) {
	ret = snd_soc_of_parse_audio_routing(&priv->snd_card,
	"simple-audio-card,routing");
	if (ret)
	return ret;
	}

	/* loop on the DAI links */
	np = NULL;
	for (;;) {
	if (multi) {
	np = of_get_next_child(node, np);
	if (!np)
	break;
	}

	ret = simple_card_cpu_codec_of(multi ? np : node,
	daifmt, dai_link, dai_props);
	if (ret < 0)
	goto err;

	/*
	* overwrite cpu_dai->fmt as its DAIFMT_MASTER bit is based on CODEC
	* while the other bits should be identical unless buggy SW/HW design.
	*/
	dai_props->cpu_dai.fmt = dai_props->codec_dai.fmt;

	if (!dai_link->cpu_dai_name \|\| !dai_link->codec_dai_name) {
	ret = -EINVAL;
	goto err;
	}

	/* simple-card assumes platform == cpu */
	dai_link->platform_of_node = dai_link->cpu_of_node;

	name = devm_kzalloc(dev,
	strlen(dai_link->cpu_dai_name) +
	strlen(dai_link->codec_dai_name) + 2,
	GFP_KERNEL);
	sprintf(name, "%s-%s", dai_link->cpu_dai_name,
	dai_link->codec_dai_name);
	dai_link->name = dai_link->stream_name = name;

	if (!multi)
	break;

	dai_link++;
	dai_props++;
	}

	/* card name is created from CPU/CODEC dai name */
	dai_link = priv->snd_card.dai_link;
	if (!priv->snd_card.name)
	priv->snd_card.name = dai_link->name;

	dev_dbg(dev, "card-name : %s\n", priv->snd_card.name);
	dev_dbg(dev, "platform : %04x\n", daifmt);
	dai_props = priv->dai_props;
	dev_dbg(dev, "cpu : %s / %04x / %d\n",
	dai_link->cpu_dai_name,
	dai_props->cpu_dai.fmt,
	dai_props->cpu_dai.sysclk);
	dev_dbg(dev, "codec : %s / %04x / %d\n",
	dai_link->codec_dai_name,
	dai_props->codec_dai.fmt,
	dai_props->codec_dai.sysclk);

	return 0;

	err:
	of_node_put(np);
	return ret;
	}

	/* update the reference count of the devices nodes at end of probe */
	static int asoc_simple_card_unref(struct platform_device *pdev)
	{
	struct snd_soc_card *card = platform_get_drvdata(pdev);
	struct snd_soc_dai_link *dai_link;
	struct device_node *np;
	int num_links;

	for (num_links = 0, dai_link = card->dai_link;
	num_links < card->num_links;
	num_links++, dai_link++) {
	np = (struct device_node *) dai_link->cpu_of_node;
	if (np)
	of_node_put(np);
	np = (struct device_node *) dai_link->codec_of_node;
	if (np)
	of_node_put(np);
	}
	return 0;
	}

	static int asoc_simple_card_probe(struct platform_device *pdev)
	{
	struct simple_card_data *priv;
	struct snd_soc_dai_link *dai_link;
	struct device_node *np = pdev->dev.of_node;
	struct device *dev = &pdev->dev;
	int num_links, multi, ret;

	/* get the number of DAI links */
	if (np && of_get_child_by_name(np, "simple-audio-card,dai-link")) {
	num_links = of_get_child_count(np);
	multi = 1;
	} else {
	num_links = 1;
	multi = 0;
	}

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

	/*
	* init snd_soc_card
	*/
	priv->snd_card.owner = THIS_MODULE;
	priv->snd_card.dev = dev;
	dai_link = priv->dai_link;
	priv->snd_card.dai_link = dai_link;
	priv->snd_card.num_links = num_links;

	/* get room for the other properties */
	priv->dai_props = devm_kzalloc(dev,
	sizeof(priv->dai_props) num_links,
	GFP_KERNEL);
	if (!priv->dai_props)
	return -ENOMEM;

	if (np && of_device_is_available(np)) {

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

	/*
	* soc_bind_dai_link() will check cpu name
	* after of_node matching if dai_link has cpu_dai_name.
	* but, it will never match if name was created by fmt_single_name()
	* remove cpu_dai_name to escape name matching.
	* see
	* fmt_single_name()
	* fmt_multiple_name()
	*/
	if (num_links == 1)
	dai_link->cpu_dai_name = NULL;

	} else {
	struct asoc_simple_card_info *cinfo;

	cinfo = dev->platform_data;
	if (!cinfo) {
	dev_err(dev, "no info for asoc-simple-card\n");
	return -EINVAL;
	}

	if (!cinfo->name \|\|
	!cinfo->codec_dai.name \|\|
	!cinfo->codec \|\|
	!cinfo->platform \|\|
	!cinfo->cpu_dai.name) {
	dev_err(dev, "insufficient asoc_simple_card_info settings\n");
	return -EINVAL;
	}

	priv->snd_card.name = (cinfo->card) ? cinfo->card : cinfo->name;
	dai_link->name = cinfo->name;
	dai_link->stream_name = cinfo->name;
	dai_link->platform_name = cinfo->platform;
	dai_link->codec_name = cinfo->codec;
	dai_link->cpu_dai_name = cinfo->cpu_dai.name;
	dai_link->codec_dai_name = cinfo->codec_dai.name;
	memcpy(&priv->dai_props->cpu_dai, &cinfo->cpu_dai,
	sizeof(priv->dai_props->cpu_dai));
	memcpy(&priv->dai_props->codec_dai, &cinfo->codec_dai,
	sizeof(priv->dai_props->codec_dai));

	priv->dai_props->cpu_dai.fmt \|= cinfo->daifmt;
	priv->dai_props->codec_dai.fmt \|= cinfo->daifmt;
	}

	/*
	* init snd_soc_dai_link
	*/
	dai_link->init = asoc_simple_card_dai_init;

	snd_soc_card_set_drvdata(&priv->snd_card, priv);

	ret = devm_snd_soc_register_card(&pdev->dev, &priv->snd_card);

	err:
	asoc_simple_card_unref(pdev);
	return ret;
	}

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

	static struct platform_driver asoc_simple_card = {
	.driver = {
	.name = "asoc-simple-card",
	.owner = THIS_MODULE,
	.of_match_table = asoc_simple_of_match,
	},
	.probe = asoc_simple_card_probe,
	};

	module_platform_driver(asoc_simple_card);

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