sound/soc/generic/audio-graph-card.c - arm/linux - Git at Google

 /*
  * 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/gpio/consumer.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;
 	struct gpio_desc *pa_gpio;
 };

 static int asoc_graph_card_outdrv_event(struct snd_soc_dapm_widget *w,
 					struct snd_kcontrol *kcontrol,
 					int event)
 {
 	struct snd_soc_dapm_context *dapm = w->dapm;
 	struct graph_card_data *priv = snd_soc_card_get_drvdata(dapm->card);

 	switch (event) {
 	case SND_SOC_DAPM_POST_PMU:
 		gpiod_set_value_cansleep(priv->pa_gpio, 1);
 		break;
 	case SND_SOC_DAPM_PRE_PMD:
 		gpiod_set_value_cansleep(priv->pa_gpio, 0);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static const struct snd_soc_dapm_widget asoc_graph_card_dapm_widgets[] = {
 	SND_SOC_DAPM_OUT_DRV_E("Amplifier", SND_SOC_NOPM,
 			       0, 0, NULL, 0, asoc_graph_card_outdrv_event,
 			       SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
 };

 #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 = 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_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);

 	asoc_simple_card_clk_disable(&dai_props->cpu_dai);

 	asoc_simple_card_clk_disable(&dai_props->codec_dai);
 }

 static const 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 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 mismatch (%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 = asoc_simple_card_of_parse_tdm(cpu_ep, cpu_dai);
 	if (ret < 0)
 		goto dai_link_of_err;

 	ret = asoc_simple_card_of_parse_tdm(codec_ep, codec_dai);
 	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;

 	asoc_simple_card_canonicalize_cpu(dai_link,
 		of_graph_get_endpoint_count(dai_link->cpu_of_node) == 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;

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

 	ret = asoc_simple_card_of_parse_routing(card, NULL, 1);
 	if (ret < 0)
 		return ret;

 	/*
 	 * we need to consider "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++);
 		if (ret < 0) {
 			of_node_put(it.node);

 			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++;

 	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->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
 	if (IS_ERR(priv->pa_gpio)) {
 		ret = PTR_ERR(priv->pa_gpio);
 		dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
 		return ret;
 	}

 	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;
 	card->dapm_widgets = asoc_graph_card_dapm_widgets;
 	card->num_dapm_widgets = ARRAY_SIZE(asoc_graph_card_dapm_widgets);

 	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)
 		goto err;

 	return 0;
 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",
 		.pm = &snd_soc_pm_ops,
 		.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>");
	/*
	* 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/gpio/consumer.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;
	struct gpio_desc *pa_gpio;
	};

	static int asoc_graph_card_outdrv_event(struct snd_soc_dapm_widget *w,
	struct snd_kcontrol *kcontrol,
	int event)
	{
	struct snd_soc_dapm_context *dapm = w->dapm;
	struct graph_card_data *priv = snd_soc_card_get_drvdata(dapm->card);

	switch (event) {
	case SND_SOC_DAPM_POST_PMU:
	gpiod_set_value_cansleep(priv->pa_gpio, 1);
	break;
	case SND_SOC_DAPM_PRE_PMD:
	gpiod_set_value_cansleep(priv->pa_gpio, 0);
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static const struct snd_soc_dapm_widget asoc_graph_card_dapm_widgets[] = {
	SND_SOC_DAPM_OUT_DRV_E("Amplifier", SND_SOC_NOPM,
	0, 0, NULL, 0, asoc_graph_card_outdrv_event,
	SND_SOC_DAPM_POST_PMU \| SND_SOC_DAPM_PRE_PMD),
	};

	#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 = 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_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);

	asoc_simple_card_clk_disable(&dai_props->cpu_dai);

	asoc_simple_card_clk_disable(&dai_props->codec_dai);
	}

	static const 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 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 mismatch (%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 = asoc_simple_card_of_parse_tdm(cpu_ep, cpu_dai);
	if (ret < 0)
	goto dai_link_of_err;

	ret = asoc_simple_card_of_parse_tdm(codec_ep, codec_dai);
	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;

	asoc_simple_card_canonicalize_cpu(dai_link,
	of_graph_get_endpoint_count(dai_link->cpu_of_node) == 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;

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

	ret = asoc_simple_card_of_parse_routing(card, NULL, 1);
	if (ret < 0)
	return ret;

	/*
	* we need to consider "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++);
	if (ret < 0) {
	of_node_put(it.node);

	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++;

	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->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
	if (IS_ERR(priv->pa_gpio)) {
	ret = PTR_ERR(priv->pa_gpio);
	dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
	return ret;
	}

	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;
	card->dapm_widgets = asoc_graph_card_dapm_widgets;
	card->num_dapm_widgets = ARRAY_SIZE(asoc_graph_card_dapm_widgets);

	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)
	goto err;

	return 0;
	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",
	.pm = &snd_soc_pm_ops,
	.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>");