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

// SPDX-License-Identifier: GPL-2.0
//
// ASoC simple SCU sound card support
//
// Copyright (C) 2015 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/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <sound/jack.h>
#include <sound/soc.h>
#include <sound/soc-dai.h>
#include <sound/simple_card_utils.h>

struct simple_card_data {
	struct snd_soc_card snd_card;
	struct snd_soc_codec_conf codec_conf;
	struct simple_dai_props {
		struct asoc_simple_dai dai;
		struct snd_soc_dai_link_component codecs;
		struct snd_soc_dai_link_component platform;
	} *dai_props;
	struct snd_soc_dai_link *dai_link;
	struct asoc_simple_card_data adata;
};

#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);

	return asoc_simple_card_clk_enable(&dai_props->dai);
}

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->dai);
}

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

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 *dai;
	struct snd_soc_dai_link *dai_link;
	struct simple_dai_props *dai_props;
	int num = rtd->num;

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

	return asoc_simple_card_init_dai(dai, &dai_props->dai);
}

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);

	asoc_simple_card_convert_fixup(&priv->adata, params);

	return 0;
}

static int asoc_simple_card_dai_link_of(struct device_node *link,
					struct device_node *np,
					struct device_node *codec,
					struct simple_card_data *priv,
					int idx, bool 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, idx);
	struct simple_dai_props *dai_props = simple_priv_to_props(priv, idx);
	struct snd_soc_card *card = simple_priv_to_card(priv);
	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;

		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_props->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 {
		/* 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;

		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_props->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,
					      &priv->codec_conf,
					      dai_link->codecs->of_node,
					      PREFIX "prefix");
		/* check "prefix" from each node if top doesn't have */
		if (!priv->codec_conf.of_node)
			snd_soc_of_parse_node_prefix(np,
						     &priv->codec_conf,
						     dai_link->codecs->of_node,
						     "prefix");
	}

	ret = asoc_simple_card_of_parse_tdm(np, &dai_props->dai);
	if (ret)
		return ret;

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

	ret = asoc_simple_card_parse_daifmt(dev, link, 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_parse_of(struct simple_card_data *priv)

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

	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;

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

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

	do  {
		codec = of_get_child_by_name(node,
					     loop ? "codec" : PREFIX "codec");
		if (!codec)
			return -ENODEV;

		for_each_child_of_node(node, np) {
			is_fe = (np != codec);

			ret = asoc_simple_card_dai_link_of(node, np, codec, priv,
							   i, is_fe, !loop);
			if (ret < 0)
				return ret;
			i++;
		}
		node = of_get_next_child(top, node);
	} while (loop && node);

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

	return 0;
}

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_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 snd_soc_card *card;
	struct device *dev = &pdev->dev;
	int ret, i;
	int lnum = 0, dnum = 0, cnum = 0;

	/* Allocate the private data */
	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);
	if (!dai_props || !dai_link)
		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;

	/* 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	= &priv->codec_conf;
	card->num_configs	= 1;

	ret = asoc_simple_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_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 = "renesas,rsrc-card", },
	{ .compatible = "simple-scu-audio-card", },
	{},
};
MODULE_DEVICE_TABLE(of, asoc_simple_of_match);

static struct platform_driver asoc_simple_card = {
	.driver = {
		.name = "simple-scu-audio-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-scu-card");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ASoC Simple SCU Sound Card");
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");