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Commit 87f937b4 authored by Kuninori Morimoto's avatar Kuninori Morimoto Committed by Mark Brown
Browse files

ASoC: add audio-graph-scu-card support 



OF-graph base DT binding is 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, and we have simple-scu-card driver
for simple-card + ALSA DPCM case.
In the future, V4L2 / ALSA will support HDMI, and then, DT bindings
between V4L2 / ALSA should be merged.
This patch adds new Audio Graph SCU Card which is OF-graph base of
simple-scu-card

Signed-off-by: default avatarKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent be10ee2c

sound/soc/generic/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -22,3 +22,12 @@ config SND_AUDIO_GRAPH_CARD 
	help

	  This option enables generic simple simple sound card support

	  with OF-graph DT bindings.



config SND_AUDIO_GRAPH_SCU_CARD

	tristate "ASoC Audio Graph SCU sound card support"

	depends on OF

	select SND_SIMPLE_CARD_UTILS

	help

	  This option enables generic simple SCU sound card support

	  with OF-graph DT bindings.

	  It supports DPCM of multi CPU single Codec ststem.

sound/soc/generic/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -2,8 +2,10 @@ 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

snd-soc-audio-graph-scu-card-objs	:= audio-graph-scu-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

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

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

0 → 100644
+416 −0
Original line number Diff line number Diff line 
/*

 * 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

 *

 * 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 snd_soc_codec_conf codec_conf;

	struct asoc_simple_dai *dai_props;

	struct snd_soc_dai_link *dai_link;

	u32 convert_rate;

	u32 convert_channels;

};



#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 clk_prepare_enable(dai_props->clk);

}



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);



	clk_disable_unprepare(dai_props->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 *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);

	struct snd_interval *rate = hw_param_interval(params,

						      SNDRV_PCM_HW_PARAM_RATE);

	struct snd_interval *channels = hw_param_interval(params,

							  SNDRV_PCM_HW_PARAM_CHANNELS);



	if (priv->convert_rate)

		rate->min =

		rate->max = priv->convert_rate;



	if (priv->convert_channels)

		channels->min =

		channels->max = priv->convert_channels;



	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,

					(card->num_links - 1) == 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 = snd_soc_of_parse_tdm_slot(ep,

					&dai_props->tx_slot_mask,

					&dai_props->rx_slot_mask,

					&dai_props->slots,

					&dai_props->slot_width);

	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;



	dev_dbg(dev, "\t%s / %04x / %d\n",

		dai_link->name,

		dai_link->dai_fmt,

		dai_props->sysclk);



	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;

	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 = snd_soc_of_parse_audio_routing(card, "routing");

	if (ret)

		return ret;



	/* sampling rate convert */

	of_property_read_u32(node, "convert-rate", &priv->convert_rate);



	/* channels transfer */

	of_property_read_u32(node, "convert-channels", &priv->convert_channels);



	/*

	 * 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_port);

		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)

			goto parse_of_err;

	}



	dai_idx = 0;

	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);



			of_node_put(cpu_port);

			of_node_put(cpu_ep);

			of_node_put(codec_ep);



			if (codec) {

				if (!codec_ep)

					continue;



				/* Back-End (= Codec) */

				ret = asoc_graph_card_dai_link_of(codec_ep, priv, daifmt, dai_idx++, 0);

				if (ret < 0)

					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)

					goto parse_of_err;

			}

		}

	}



	ret = asoc_simple_card_parse_card_name(card, NULL);

	if (ret)

		goto parse_of_err;



	dev_dbg(dev, "New card: %s\n",

		card->name ? card->name : "");

	dev_dbg(dev, "convert_rate     %d\n", priv->convert_rate);

	dev_dbg(dev, "convert_channels %d\n", priv->convert_channels);



	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;

	int count = 0;

	int rc;



	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);



		of_node_put(cpu_port);

		of_node_put(cpu_ep);

		of_node_put(codec_ep);



		if (cpu_ep)

			count++;

		if (codec_ep)

			count++;

	}



	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_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		= 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)

		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-scu-card", },

	{},

};

MODULE_DEVICE_TABLE(of, asoc_graph_of_match);



static struct platform_driver asoc_graph_card = {

	.driver = {

		.name = "asoc-audio-graph-scu-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-scu-card");

MODULE_LICENSE("GPL v2");

MODULE_DESCRIPTION("ASoC Audio Graph SCU Sound Card");

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