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Commit 2692c1c6 authored by Kuninori Morimoto's avatar Kuninori Morimoto Committed by Mark Brown
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ASoC: add audio-graph-card support 



OF-graph base DT binding are used on V4L2, and ALSA SoC is using
different style of DT today. Now ALSA SoC supports simple-card driver
for generic/simple sound card.
In the future, V4L2 / ALSA will support HDMI, and then, DT bindings
between V4L2 / ALSA should be merged.
This patch adds new Audio Graph Card which is OF-graph base of
simple-card

Signed-off-by: default avatarKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 2d4e31de

sound/soc/generic/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -14,3 +14,11 @@ config SND_SIMPLE_SCU_CARD 
	help

	  This option enables generic simple SCU sound card support.

	  It supports DPCM of multi CPU single Codec system.



config SND_AUDIO_GRAPH_CARD

	tristate "ASoC Audio Graph sound card support"

	depends on OF

	select SND_SIMPLE_CARD_UTILS

	help

	  This option enables generic simple simple sound card support

	  with OF-graph DT bindings.

sound/soc/generic/Makefile

+2 −0
Original line number Diff line number Diff line 
snd-soc-simple-card-utils-objs	:= simple-card-utils.o

snd-soc-simple-card-objs	:= simple-card.o

snd-soc-simple-scu-card-objs	:= simple-scu-card.o

snd-soc-audio-graph-card-objs	:= audio-graph-card.o



obj-$(CONFIG_SND_SIMPLE_CARD_UTILS)	+= snd-soc-simple-card-utils.o

obj-$(CONFIG_SND_SIMPLE_CARD)		+= snd-soc-simple-card.o

obj-$(CONFIG_SND_SIMPLE_SCU_CARD)	+= snd-soc-simple-scu-card.o

obj-$(CONFIG_SND_AUDIO_GRAPH_CARD)	+= snd-soc-audio-graph-card.o

sound/soc/generic/audio-graph-card.c

0 → 100644
+308 −0
Original line number Diff line number Diff line 
/*

 * 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

 *

 * 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/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 graph_dai_props {

		struct asoc_simple_dai cpu_dai;

		struct asoc_simple_dai codec_dai;

	} *dai_props;

	struct snd_soc_dai_link *dai_link;

};



#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 graph_dai_props *dai_props = graph_priv_to_props(priv, rtd->num);

	int ret;



	ret = clk_prepare_enable(dai_props->cpu_dai.clk);

	if (ret)

		return ret;



	ret = clk_prepare_enable(dai_props->codec_dai.clk);

	if (ret)

		clk_disable_unprepare(dai_props->cpu_dai.clk);



	return ret;

}



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 graph_dai_props *dai_props = graph_priv_to_props(priv, rtd->num);



	clk_disable_unprepare(dai_props->cpu_dai.clk);



	clk_disable_unprepare(dai_props->codec_dai.clk);

}



static 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 *codec = rtd->codec_dai;

	struct snd_soc_dai *cpu = rtd->cpu_dai;

	struct graph_dai_props *dai_props =

		graph_priv_to_props(priv, rtd->num);

	int ret;



	ret = asoc_simple_card_init_dai(codec, &dai_props->codec_dai);

	if (ret < 0)

		return ret;



	ret = asoc_simple_card_init_dai(cpu, &dai_props->cpu_dai);

	if (ret < 0)

		return ret;



	return 0;

}



static int asoc_graph_card_dai_link_of(struct device_node *cpu_port,

					struct graph_card_data *priv,

					int idx)

{

	struct device *dev = graph_priv_to_dev(priv);

	struct snd_soc_dai_link *dai_link = graph_priv_to_link(priv, idx);

	struct graph_dai_props *dai_props = graph_priv_to_props(priv, idx);

	struct asoc_simple_dai *cpu_dai = &dai_props->cpu_dai;

	struct asoc_simple_dai *codec_dai = &dai_props->codec_dai;

	struct snd_soc_card *card = graph_priv_to_card(priv);

	struct device_node *cpu_ep    = of_get_next_child(cpu_port, NULL);

	struct device_node *codec_ep = of_graph_get_remote_endpoint(cpu_ep);

	struct device_node *rcpu_ep = of_graph_get_remote_endpoint(codec_ep);

	int ret;



	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 dai_link_of_err;

	}



	ret = asoc_simple_card_parse_daifmt(dev, cpu_ep, codec_ep,

					    NULL, &dai_link->dai_fmt);

	if (ret < 0)

		goto dai_link_of_err;



	/*

	 * we need to consider "mclk-fs" around here

	 * see simple-card

	 */



	ret = asoc_simple_card_parse_graph_cpu(cpu_ep, dai_link);

	if (ret < 0)

		goto dai_link_of_err;



	ret = asoc_simple_card_parse_graph_codec(codec_ep, dai_link);

	if (ret < 0)

		goto dai_link_of_err;



	ret = snd_soc_of_parse_tdm_slot(cpu_ep,

					&cpu_dai->tx_slot_mask,

					&cpu_dai->rx_slot_mask,

					&cpu_dai->slots,

					&cpu_dai->slot_width);

	if (ret < 0)

		goto dai_link_of_err;



	ret = snd_soc_of_parse_tdm_slot(codec_ep,

					&codec_dai->tx_slot_mask,

					&codec_dai->rx_slot_mask,

					&codec_dai->slots,

					&codec_dai->slot_width);

	if (ret < 0)

		goto dai_link_of_err;



	ret = asoc_simple_card_parse_clk_cpu(dev, cpu_ep, dai_link, cpu_dai);

	if (ret < 0)

		goto dai_link_of_err;



	ret = asoc_simple_card_parse_clk_codec(dev, codec_ep, 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->codec_dai_name);

	if (ret < 0)

		goto dai_link_of_err;



	dai_link->ops = &asoc_graph_card_ops;

	dai_link->init = asoc_graph_card_dai_init;



	dev_dbg(dev, "\tname : %s\n", dai_link->stream_name);

	dev_dbg(dev, "\tformat : %04x\n", dai_link->dai_fmt);

	dev_dbg(dev, "\tcpu : %s / %d\n",

		dai_link->cpu_dai_name,

		cpu_dai->sysclk);

	dev_dbg(dev, "\tcodec : %s / %d\n",

		dai_link->codec_dai_name,

		codec_dai->sysclk);



	asoc_simple_card_canonicalize_cpu(dai_link,

					  card->num_links == 1);



dai_link_of_err:

	of_node_put(cpu_ep);

	of_node_put(rcpu_ep);

	of_node_put(codec_ep);



	return ret;

}



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;

	int rc, idx = 0;

	int ret;



	/*

	 * we need to consider "widgets", "routing", "mclk-fs" around here

	 * see simple-card

	 */



	of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {

		ret = asoc_graph_card_dai_link_of(it.node, priv, idx++);

		of_node_put(it.node);

		if (ret < 0)

			return ret;

	}



	return asoc_simple_card_parse_card_name(card, NULL);

}



static int asoc_graph_get_dais_count(struct device *dev)

{

	struct of_phandle_iterator it;

	struct device_node *node = dev->of_node;

	int count = 0;

	int rc;



	of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {

		count++;

		of_node_put(it.node);

	}



	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 graph_dai_props *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_kzalloc(dev, sizeof(*dai_props) * num, GFP_KERNEL);

	dai_link  = devm_kzalloc(dev, sizeof(*dai_link)  * num, 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	= dai_link;

	card->num_links	= num;



	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)

		return ret;

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-card", },

	{},

};

MODULE_DEVICE_TABLE(of, asoc_graph_of_match);



static struct platform_driver asoc_graph_card = {

	.driver = {

		.name = "asoc-audio-graph-card",

		.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-card");

MODULE_LICENSE("GPL v2");

MODULE_DESCRIPTION("ASoC Audio Graph Sound Card");

MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");