linux/sound/soc/generic/simple-card.c

// SPDX-License-Identifier: GPL-2.0
//
// ASoC simple sound card support
//
// Copyright (C) 2012 Renesas Solutions Corp.
// Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

#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;
		struct snd_soc_dai_link_component codecs; /* single codec */
		struct snd_soc_dai_link_component platform;
		struct asoc_simple_card_data adata;
		struct snd_soc_codec_conf *codec_conf;
		unsigned int mclk_fs;
	} *dai_props;
	unsigned int mclk_fs;
	struct asoc_simple_jack hp_jack;
	struct asoc_simple_jack mic_jack;
	struct snd_soc_dai_link *dai_link;
	struct asoc_simple_dai *dais;
	struct asoc_simple_card_data adata;
	struct snd_soc_codec_conf *codec_conf;
};

#define simple_priv_to_card(priv) (&(priv)->snd_card)
#define simple_priv_to_props(priv, i) ((priv)->dai_props + (i))
#define simple_priv_to_dev(priv) (simple_priv_to_card(priv)->dev)
#define simple_priv_to_link(priv, i) (simple_priv_to_card(priv)->dai_link + (i))

#define DAI	"sound-dai"
#define CELL	"#sound-dai-cells"
#define PREFIX	"simple-audio-card,"

static int asoc_simple_card_startup(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct simple_card_data *priv =	snd_soc_card_get_drvdata(rtd->card);
	struct simple_dai_props *dai_props =
		simple_priv_to_props(priv, rtd->num);
	int ret;

	ret = asoc_simple_card_clk_enable(dai_props->cpu_dai);
	if (ret)
		return ret;

	ret = asoc_simple_card_clk_enable(dai_props->codec_dai);
	if (ret)
		asoc_simple_card_clk_disable(dai_props->cpu_dai);

	return ret;
}

static void asoc_simple_card_shutdown(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct simple_card_data *priv =	snd_soc_card_get_drvdata(rtd->card);
	struct simple_dai_props *dai_props =
		simple_priv_to_props(priv, rtd->num);

	asoc_simple_card_clk_disable(dai_props->cpu_dai);

	asoc_simple_card_clk_disable(dai_props->codec_dai);
}

static int asoc_simple_set_clk_rate(struct asoc_simple_dai *simple_dai,
				    unsigned long rate)
{
	if (!simple_dai)
		return 0;

	if (!simple_dai->clk)
		return 0;

	if (clk_get_rate(simple_dai->clk) == rate)
		return 0;

	return clk_set_rate(simple_dai->clk, rate);
}

static int asoc_simple_card_hw_params(struct snd_pcm_substream *substream,
				      struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
	struct simple_dai_props *dai_props =
		simple_priv_to_props(priv, rtd->num);
	unsigned int mclk, mclk_fs = 0;
	int ret = 0;

	if (priv->mclk_fs)
		mclk_fs = priv->mclk_fs;
	else if (dai_props->mclk_fs)
		mclk_fs = dai_props->mclk_fs;

	if (mclk_fs) {
		mclk = params_rate(params) * mclk_fs;

		ret = asoc_simple_set_clk_rate(dai_props->codec_dai, mclk);
		if (ret < 0)
			return ret;

		ret = asoc_simple_set_clk_rate(dai_props->cpu_dai, mclk);
		if (ret < 0)
			return ret;

		ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
					     SND_SOC_CLOCK_IN);
		if (ret && ret != -ENOTSUPP)
			goto err;

		ret = snd_soc_dai_set_sysclk(cpu_dai, 0, mclk,
					     SND_SOC_CLOCK_OUT);
		if (ret && ret != -ENOTSUPP)
			goto err;
	}
	return 0;
err:
	return ret;
}

static const struct snd_soc_ops asoc_simple_card_ops = {
	.startup = asoc_simple_card_startup,
	.shutdown = asoc_simple_card_shutdown,
	.hw_params = asoc_simple_card_hw_params,
};

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 simple_dai_props *dai_props = simple_priv_to_props(priv, rtd->num);
	int ret;

	ret = asoc_simple_card_init_dai(rtd->codec_dai,
					dai_props->codec_dai);
	if (ret < 0)
		return ret;

	ret = asoc_simple_card_init_dai(rtd->cpu_dai,
					dai_props->cpu_dai);
	if (ret < 0)
		return ret;

	return 0;
}

static int asoc_simple_card_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
					       struct snd_pcm_hw_params *params)
{
	struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
	struct simple_dai_props *dai_props = simple_priv_to_props(priv, rtd->num);

	asoc_simple_card_convert_fixup(&dai_props->adata, params);

	/* overwrite by top level adata if exist */
	asoc_simple_card_convert_fixup(&priv->adata, params);

	return 0;
}

static int asoc_simple_card_dai_link_of_dpcm(struct device_node *node,
					     struct device_node *np,
					     struct device_node *codec,
					     struct simple_card_data *priv,
					     int *dai_idx, int link_idx,
					     int *conf_idx, int is_fe,
					     bool is_top_level_node)
{
	struct device *dev = simple_priv_to_dev(priv);
	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, link_idx);
	struct simple_dai_props *dai_props = simple_priv_to_props(priv, link_idx);
	struct snd_soc_card *card = simple_priv_to_card(priv);
	struct asoc_simple_dai *dai;
	char *prefix = "";
	int ret;

	/* For single DAI link & old style of DT node */
	if (is_top_level_node)
		prefix = PREFIX;

	if (is_fe) {
		int is_single_links = 0;
		struct snd_soc_dai_link_component *codecs;

		/* BE is dummy */
		codecs			= dai_link->codecs;
		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[(*dai_idx)++];

		ret = asoc_simple_card_parse_cpu(np, dai_link, DAI, CELL,
						 &is_single_links);
		if (ret)
			return ret;

		ret = asoc_simple_card_parse_clk_cpu(dev, np, dai_link, dai);
		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;

		asoc_simple_card_canonicalize_cpu(dai_link, is_single_links);
	} else {
		struct snd_soc_codec_conf *cconf;

		/* 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_simple_card_be_hw_params_fixup;

		dai =
		dai_props->codec_dai	= &priv->dais[(*dai_idx)++];

		cconf =
		dai_props->codec_conf	= &priv->codec_conf[(*conf_idx)++];

		ret = asoc_simple_card_parse_codec(np, dai_link, DAI, CELL);
		if (ret < 0)
			return ret;

		ret = asoc_simple_card_parse_clk_codec(dev, np, dai_link, dai);
		if (ret < 0)
			return ret;

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

		/* check "prefix" from top node */
		snd_soc_of_parse_audio_prefix(card, cconf,
					      dai_link->codecs->of_node,
					      PREFIX "prefix");
		/* check "prefix" from each node if top doesn't have */
		if (!cconf->of_node)
			snd_soc_of_parse_node_prefix(np, cconf,
						     dai_link->codecs->of_node,
						     "prefix");
	}

	asoc_simple_card_parse_convert(dev, node, prefix, &dai_props->adata);

	ret = asoc_simple_card_of_parse_tdm(np, dai);
	if (ret)
		return ret;

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

	of_property_read_u32(np, "mclk-fs", &dai_props->mclk_fs);

	ret = asoc_simple_card_parse_daifmt(dev, node, codec,
					    prefix, &dai_link->dai_fmt);
	if (ret < 0)
		return ret;

	dai_link->dpcm_playback		= 1;
	dai_link->dpcm_capture		= 1;
	dai_link->ops			= &asoc_simple_card_ops;
	dai_link->init			= asoc_simple_card_dai_init;

	return 0;
}

static int asoc_simple_card_dai_link_of(struct device_node *node,
					struct simple_card_data *priv,
					int *dai_idx, int link_idx,
					bool is_top_level_node)
{
	struct device *dev = simple_priv_to_dev(priv);
	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, link_idx);
	struct simple_dai_props *dai_props = simple_priv_to_props(priv, link_idx);
	struct asoc_simple_dai *cpu_dai;
	struct asoc_simple_dai *codec_dai;
	struct device_node *cpu = NULL;
	struct device_node *plat = NULL;
	struct device_node *codec = NULL;
	char prop[128];
	char *prefix = "";
	int ret, single_cpu;

	/* For single DAI link & old style of DT node */
	if (is_top_level_node)
		prefix = PREFIX;

	snprintf(prop, sizeof(prop), "%scpu", prefix);
	cpu = of_get_child_by_name(node, prop);

	if (!cpu) {
		ret = -EINVAL;
		dev_err(dev, "%s: Can't find %s DT node\n", __func__, prop);
		goto dai_link_of_err;
	}

	snprintf(prop, sizeof(prop), "%splat", prefix);
	plat = of_get_child_by_name(node, prop);

	snprintf(prop, sizeof(prop), "%scodec", prefix);
	codec = of_get_child_by_name(node, prop);

	if (!codec) {
		ret = -EINVAL;
		dev_err(dev, "%s: Can't find %s DT node\n", __func__, prop);
		goto dai_link_of_err;
	}

	cpu_dai			=
	dai_props->cpu_dai	= &priv->dais[(*dai_idx)++];
	codec_dai		=
	dai_props->codec_dai	= &priv->dais[(*dai_idx)++];

	ret = asoc_simple_card_parse_daifmt(dev, node, codec,
					    prefix, &dai_link->dai_fmt);
	if (ret < 0)
		goto dai_link_of_err;

	of_property_read_u32(node, "mclk-fs", &dai_props->mclk_fs);

	ret = asoc_simple_card_parse_cpu(cpu, dai_link,
					 DAI, CELL, &single_cpu);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_parse_codec(codec, dai_link, DAI, CELL);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_parse_platform(plat, dai_link, DAI, CELL);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_of_parse_tdm(cpu, cpu_dai);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_of_parse_tdm(codec, codec_dai);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_parse_clk_cpu(dev, cpu, dai_link, cpu_dai);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_parse_clk_codec(dev, codec, dai_link, codec_dai);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_canonicalize_dailink(dai_link);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_set_dailink_name(dev, dai_link,
						"%s-%s",
						dai_link->cpu_dai_name,
						dai_link->codecs->dai_name);
	if (ret < 0)
		goto dai_link_of_err;

	dai_link->ops = &asoc_simple_card_ops;
	dai_link->init = asoc_simple_card_dai_init;

	asoc_simple_card_canonicalize_cpu(dai_link, single_cpu);

dai_link_of_err:
	of_node_put(cpu);
	of_node_put(codec);

	return ret;
}

static int asoc_simple_card_parse_aux_devs(struct device_node *node,
					   struct simple_card_data *priv)
{
	struct device *dev = simple_priv_to_dev(priv);
	struct device_node *aux_node;
	struct snd_soc_card *card = simple_priv_to_card(priv);
	int i, n, len;

	if (!of_find_property(node, PREFIX "aux-devs", &len))
		return 0;		/* Ok to have no aux-devs */

	n = len / sizeof(__be32);
	if (n <= 0)
		return -EINVAL;

	card->aux_dev = devm_kcalloc(dev,
			n, sizeof(*card->aux_dev), GFP_KERNEL);
	if (!card->aux_dev)
		return -ENOMEM;

	for (i = 0; i < n; i++) {
		aux_node = of_parse_phandle(node, PREFIX "aux-devs", i);
		if (!aux_node)
			return -EINVAL;
		card->aux_dev[i].codec_of_node = aux_node;
	}

	card->num_aux_devs = n;
	return 0;
}

static int asoc_simple_card_parse_of(struct simple_card_data *priv)
{
	struct device *dev = simple_priv_to_dev(priv);
	struct device_node *top = dev->of_node;
	struct snd_soc_card *card = simple_priv_to_card(priv);
	struct device_node *node;
	struct device_node *np;
	struct device_node *codec;
	bool is_fe;
	int ret, loop;
	int dai_idx, link_idx, conf_idx;

	if (!top)
		return -EINVAL;

	ret = asoc_simple_card_of_parse_widgets(card, PREFIX);
	if (ret < 0)
		return ret;

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

	/* Factor to mclk, used in hw_params() */
	of_property_read_u32(top, PREFIX "mclk-fs", &priv->mclk_fs);

	asoc_simple_card_parse_convert(dev, top, PREFIX, &priv->adata);

	/* Single/Muti DAI link(s) & New style of DT node */
	loop		= 1;
	link_idx	= 0;
	dai_idx		= 0;
	conf_idx	= 0;
	node = of_get_child_by_name(top, PREFIX "dai-link");
	if (!node) {
		node = dev->of_node;
		loop = 0;
	}

	do  {
		/* DPCM */
		if (of_get_child_count(node) > 2) {
			for_each_child_of_node(node, np) {
				codec = of_get_child_by_name(node,
							loop ?	"codec" :
								PREFIX "codec");
				if (!codec)
					return -ENODEV;

				is_fe = (np != codec);

				ret = asoc_simple_card_dai_link_of_dpcm(
						node, np, codec, priv,
						&dai_idx, link_idx++, &conf_idx,
						is_fe, !loop);
			}
		} else {
			ret = asoc_simple_card_dai_link_of(
						node, priv,
						&dai_idx, link_idx++, !loop);
		}
		if (ret < 0)
			return ret;

		node = of_get_next_child(top, node);
	} while (loop && node);

	ret = asoc_simple_card_parse_card_name(card, PREFIX);
	if (ret < 0)
		return ret;

	ret = asoc_simple_card_parse_aux_devs(top, priv);

	return ret;
}

static void asoc_simple_card_get_dais_count(struct device *dev,
					    int *link_num,
					    int *dais_num,
					    int *ccnf_num)
{
	struct device_node *top = dev->of_node;
	struct device_node *node;
	int loop;
	int num;

	/*
	 * 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
	 */
	if (!top) {
		(*link_num) = 1;
		(*dais_num) = 2;
		(*ccnf_num) = 0;
		return;
	}

	loop = 1;
	node = of_get_child_by_name(top, PREFIX "dai-link");
	if (!node) {
		node = top;
		loop = 0;
	}

	do {
		num = of_get_child_count(node);
		(*dais_num) += num;
		if (num > 2) {
			(*link_num) += num;
			(*ccnf_num)++;
		} else {
			(*link_num)++;
		}
		node = of_get_next_child(top, node);
	} while (loop && node);
}

static int asoc_simple_soc_card_probe(struct snd_soc_card *card)
{
	struct simple_card_data *priv = snd_soc_card_get_drvdata(card);
	int ret;

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

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

	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 simple_dai_props *dai_props;
	struct asoc_simple_dai *dais;
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct snd_soc_card *card;
	struct snd_soc_codec_conf *cconf;
	int lnum = 0, dnum = 0, cnum = 0;
	int ret, i;

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

	asoc_simple_card_get_dais_count(dev, &lnum, &dnum, &cnum);
	if (!lnum || !dnum)
		return -EINVAL;

	dai_props = devm_kcalloc(dev, lnum, sizeof(*dai_props), GFP_KERNEL);
	dai_link  = devm_kcalloc(dev, lnum, sizeof(*dai_link),  GFP_KERNEL);
	dais      = devm_kcalloc(dev, dnum, sizeof(*dais),      GFP_KERNEL);
	cconf     = devm_kcalloc(dev, cnum, sizeof(*cconf),     GFP_KERNEL);
	if (!dai_props || !dai_link || !dais)
		return -ENOMEM;

	/*
	 * Use snd_soc_dai_link_component instead of legacy style
	 * It is codec only. but cpu/platform will be supported in the future.
	 * see
	 *	soc-core.c :: snd_soc_init_multicodec()
	 */
	for (i = 0; i < lnum; i++) {
		dai_link[i].codecs	= &dai_props[i].codecs;
		dai_link[i].num_codecs	= 1;
		dai_link[i].platform	= &dai_props[i].platform;
	}

	priv->dai_props			= dai_props;
	priv->dai_link			= dai_link;
	priv->dais			= dais;
	priv->codec_conf		= cconf;

	/* Init snd_soc_card */
	card = simple_priv_to_card(priv);
	card->owner		= THIS_MODULE;
	card->dev		= dev;
	card->dai_link		= priv->dai_link;
	card->num_links		= lnum;
	card->codec_conf	= cconf;
	card->num_configs	= cnum;
	card->probe		= asoc_simple_soc_card_probe;

	if (np && of_device_is_available(np)) {

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

	} else {
		struct asoc_simple_card_info *cinfo;
		struct snd_soc_dai_link_component *codecs;
		struct snd_soc_dai_link_component *platform;
		int dai_idx = 0;

		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;
		}

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

		codecs			= dai_link->codecs;
		codecs->name		= cinfo->codec;
		codecs->dai_name	= cinfo->codec_dai.name;

		platform		= dai_link->platform;
		platform->name		= cinfo->platform;

		card->name		= (cinfo->card) ? cinfo->card : cinfo->name;
		dai_link->name		= cinfo->name;
		dai_link->stream_name	= cinfo->name;
		dai_link->cpu_dai_name	= cinfo->cpu_dai.name;
		dai_link->dai_fmt	= cinfo->daifmt;
		dai_link->init		= asoc_simple_card_dai_init;
		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));
	}

	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_simple_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_simple_of_match[] = {
	{ .compatible = "simple-audio-card", },
	{ .compatible = "simple-scu-audio-card", },
	{},
};
MODULE_DEVICE_TABLE(of, asoc_simple_of_match);

static struct platform_driver asoc_simple_card = {
	.driver = {
		.name = "asoc-simple-card",
		.pm = &snd_soc_pm_ops,
		.of_match_table = asoc_simple_of_match,
	},
	.probe = asoc_simple_card_probe,
	.remove = asoc_simple_card_remove,
};

module_platform_driver(asoc_simple_card);

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