simple-card.c

/*
 * ASoC simple sound card support
 *
 * Copyright (C) 2012 Renesas Solutions Corp.
 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 *
 * 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_gpio.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <sound/jack.h>
#include <sound/simple_card.h>
#include <sound/soc-dai.h>
#include <sound/soc.h>

struct asoc_simple_jack {
	struct snd_soc_jack jack;
	struct snd_soc_jack_pin pin;
	struct snd_soc_jack_gpio gpio;
};

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;
		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[];	/* dynamically allocated */
};

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

#define PREFIX	"simple-audio-card,"

#define asoc_simple_card_init_hp(card, sjack, prefix)\
	asoc_simple_card_init_jack(card, sjack, 1, prefix)
#define asoc_simple_card_init_mic(card, sjack, prefix)\
	asoc_simple_card_init_jack(card, sjack, 0, prefix)
static int asoc_simple_card_init_jack(struct snd_soc_card *card,
				      struct asoc_simple_jack *sjack,
				      int is_hp, char *prefix)
{
	struct device *dev = card->dev;
	enum of_gpio_flags flags;
	char prop[128];
	char *pin_name;
	char *gpio_name;
	int mask;
	int det;

	sjack->gpio.gpio = -ENOENT;

	if (is_hp) {
		snprintf(prop, sizeof(prop), "%shp-det-gpio", prefix);
		pin_name	= "Headphones";
		gpio_name	= "Headphone detection";
		mask		= SND_JACK_HEADPHONE;
	} else {
		snprintf(prop, sizeof(prop), "%smic-det-gpio", prefix);
		pin_name	= "Mic Jack";
		gpio_name	= "Mic detection";
		mask		= SND_JACK_MICROPHONE;
	}

	det = of_get_named_gpio_flags(dev->of_node, prop, 0, &flags);
	if (det == -EPROBE_DEFER)
		return -EPROBE_DEFER;

	if (gpio_is_valid(det)) {
		sjack->pin.pin		= pin_name;
		sjack->pin.mask		= mask;

		sjack->gpio.name	= gpio_name;
		sjack->gpio.report	= mask;
		sjack->gpio.gpio	= det;
		sjack->gpio.invert	= !!(flags & OF_GPIO_ACTIVE_LOW);
		sjack->gpio.debounce_time = 150;

		snd_soc_card_jack_new(card, pin_name, mask,
				      &sjack->jack,
				      &sjack->pin, 1);

		snd_soc_jack_add_gpios(&sjack->jack, 1,
				       &sjack->gpio);
	}

	return 0;
}

static void asoc_simple_card_remove_jack(struct asoc_simple_jack *sjack)
{
	if (gpio_is_valid(sjack->gpio.gpio))
		snd_soc_jack_free_gpios(&sjack->jack, 1, &sjack->gpio);
}

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 =
		&priv->dai_props[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_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 =
		&priv->dai_props[rtd->num];

	clk_disable_unprepare(dai_props->cpu_dai.clk);

	clk_disable_unprepare(dai_props->codec_dai.clk);
}

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 = &priv->dai_props[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 = 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 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_dai *dai,
				       struct asoc_simple_dai *set)
{
	int ret;

	if (set->sysclk) {
		ret = snd_soc_dai_set_sysclk(dai, 0, set->sysclk, 0);
		if (ret && ret != -ENOTSUPP) {
			dev_err(dai->dev, "simple-card: set_sysclk error\n");
			goto err;
		}
	}

	if (set->slots) {
		ret = snd_soc_dai_set_tdm_slot(dai,
					       set->tx_slot_mask,
					       set->rx_slot_mask,
						set->slots,
						set->slot_width);
		if (ret && ret != -ENOTSUPP) {
			dev_err(dai->dev, "simple-card: set_tdm_slot error\n");
			goto err;
		}
	}

	ret = 0;

err:
	return ret;
}

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 *codec = rtd->codec_dai;
	struct snd_soc_dai *cpu = rtd->cpu_dai;
	struct simple_dai_props *dai_props;
	int ret;

	dai_props = &priv->dai_props[rtd->num];
	ret = __asoc_simple_card_dai_init(codec, &dai_props->codec_dai);
	if (ret < 0)
		return ret;

	ret = __asoc_simple_card_dai_init(cpu, &dai_props->cpu_dai);
	if (ret < 0)
		return ret;

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

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

	return 0;
}

static int
asoc_simple_card_sub_parse_of(struct device_node *np,
			      struct asoc_simple_dai *dai,
			      struct device_node **p_node,
			      const char **name,
			      int *args_count)
{
	struct of_phandle_args args;
	struct clk *clk;
	u32 val;
	int ret;

	if (!np)
		return 0;

	/*
	 * Get node via "sound-dai = <&phandle port>"
	 * it will be used as xxx_of_node on soc_bind_dai_link()
	 */
	ret = of_parse_phandle_with_args(np, "sound-dai",
					 "#sound-dai-cells", 0, &args);
	if (ret)
		return ret;

	*p_node = args.np;

	if (args_count)
		*args_count = args.args_count;

	/* Get dai->name */
	if (name) {
		ret = snd_soc_of_get_dai_name(np, name);
		if (ret < 0)
			return ret;
	}

	if (!dai)
		return 0;

	/* Parse TDM slot */
	ret = snd_soc_of_parse_tdm_slot(np, &dai->tx_slot_mask,
					&dai->rx_slot_mask,
					&dai->slots, &dai->slot_width);
	if (ret)
		return ret;

	/*
	 * Parse dai->sysclk come from "clocks = <&xxx>"
	 * (if system has common clock)
	 *  or "system-clock-frequency = <xxx>"
	 *  or device's module clock.
	 */
	if (of_property_read_bool(np, "clocks")) {
		clk = of_clk_get(np, 0);
		if (IS_ERR(clk)) {
			ret = PTR_ERR(clk);
			return ret;
		}

		dai->sysclk = clk_get_rate(clk);
		dai->clk = clk;
	} else if (!of_property_read_u32(np, "system-clock-frequency", &val)) {
		dai->sysclk = val;
	} else {
		clk = of_clk_get(args.np, 0);
		if (!IS_ERR(clk))
			dai->sysclk = clk_get_rate(clk);
	}

	return 0;
}

static int asoc_simple_card_dai_link_of(struct device_node *node,
					struct simple_card_data *priv,
					int 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, idx);
	struct simple_dai_props *dai_props = simple_priv_to_props(priv, idx);
	struct device_node *cpu = NULL;
	struct device_node *plat = NULL;
	struct device_node *codec = NULL;
	char prop[128];
	char *prefix = "";
	int ret, cpu_args;
	u32 val;

	/* 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);

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

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

	if (!of_property_read_u32(node, "mclk-fs", &val))
		dai_props->mclk_fs = val;

	ret = asoc_simple_card_sub_parse_of(cpu, &dai_props->cpu_dai,
					    &dai_link->cpu_of_node,
					    &dai_link->cpu_dai_name,
					    &cpu_args);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_sub_parse_of(codec, &dai_props->codec_dai,
					    &dai_link->codec_of_node,
					    &dai_link->codec_dai_name, NULL);
	if (ret < 0)
		goto dai_link_of_err;

	ret = asoc_simple_card_sub_parse_of(plat, NULL,
					    &dai_link->platform_of_node,
					    NULL, NULL);
	if (ret < 0)
		goto dai_link_of_err;

	if (!dai_link->cpu_dai_name || !dai_link->codec_dai_name) {
		ret = -EINVAL;
		goto dai_link_of_err;
	}

	/* Assumes platform == cpu */
	if (!dai_link->platform_of_node)
		dai_link->platform_of_node = dai_link->cpu_of_node;

	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_simple_card_ops;
	dai_link->init = asoc_simple_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,
		dai_props->cpu_dai.sysclk);
	dev_dbg(dev, "\tcodec : %s / %d\n",
		dai_link->codec_dai_name,
		dai_props->codec_dai.sysclk);

	/*
	 * In soc_bind_dai_link() will check cpu name after
	 * of_node matching if dai_link has cpu_dai_name.
	 * but, it will never match if name was created by
	 * fmt_single_name() remove cpu_dai_name if cpu_args
	 * was 0. See:
	 *	fmt_single_name()
	 *	fmt_multiple_name()
	 */
	if (!cpu_args)
		dai_link->cpu_dai_name = NULL;

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

	return ret;
}

static int asoc_simple_card_parse_of(struct device_node *node,
				     struct simple_card_data *priv)
{
	struct device *dev = simple_priv_to_dev(priv);
	u32 val;
	int ret;

	if (!node)
		return -EINVAL;

	/* Parse the card name from DT */
	snd_soc_of_parse_card_name(&priv->snd_card, PREFIX "name");

	/* The off-codec widgets */
	if (of_property_read_bool(node, PREFIX "widgets")) {
		ret = snd_soc_of_parse_audio_simple_widgets(&priv->snd_card,
					PREFIX "widgets");
		if (ret)
			return ret;
	}

	/* DAPM routes */
	if (of_property_read_bool(node, PREFIX "routing")) {
		ret = snd_soc_of_parse_audio_routing(&priv->snd_card,
					PREFIX "routing");
		if (ret)
			return ret;
	}

	/* Factor to mclk, used in hw_params() */
	ret = of_property_read_u32(node, PREFIX "mclk-fs", &val);
	if (ret == 0)
		priv->mclk_fs = val;

	dev_dbg(dev, "New simple-card: %s\n", priv->snd_card.name ?
		priv->snd_card.name : "");

	/* Single/Muti DAI link(s) & New style of DT node */
	if (of_get_child_by_name(node, PREFIX "dai-link")) {
		struct device_node *np = NULL;
		int i = 0;

		for_each_child_of_node(node, np) {
			dev_dbg(dev, "\tlink %d:\n", i);
			ret = asoc_simple_card_dai_link_of(np, priv,
							   i, false);
			if (ret < 0) {
				of_node_put(np);
				return ret;
			}
			i++;
		}
	} else {
		/* For single DAI link & old style of DT node */
		ret = asoc_simple_card_dai_link_of(node, priv, 0, true);
		if (ret < 0)
			return ret;
	}

	if (!priv->snd_card.name)
		priv->snd_card.name = priv->snd_card.dai_link->name;

	return 0;
}

/* Decrease the reference count of the device nodes */
static int asoc_simple_card_unref(struct snd_soc_card *card)
{
	struct snd_soc_dai_link *dai_link;
	int num_links;

	for (num_links = 0, dai_link = card->dai_link;
	     num_links < card->num_links;
	     num_links++, dai_link++) {
		of_node_put(dai_link->cpu_of_node);
		of_node_put(dai_link->codec_of_node);
	}
	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 device_node *np = pdev->dev.of_node;
	struct device *dev = &pdev->dev;
	int num_links, ret;

	/* Get the number of DAI links */
	if (np && of_get_child_by_name(np, PREFIX "dai-link"))
		num_links = of_get_child_count(np);
	else
		num_links = 1;

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

	/* Init snd_soc_card */
	priv->snd_card.owner = THIS_MODULE;
	priv->snd_card.dev = dev;
	dai_link = priv->dai_link;
	priv->snd_card.dai_link = dai_link;
	priv->snd_card.num_links = num_links;

	/* Get room for the other properties */
	priv->dai_props = devm_kzalloc(dev,
			sizeof(*priv->dai_props) * num_links,
			GFP_KERNEL);
	if (!priv->dai_props)
		return -ENOMEM;

	if (np && of_device_is_available(np)) {

		ret = asoc_simple_card_parse_of(np, 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;

		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;
		}

		priv->snd_card.name	= (cinfo->card) ? cinfo->card : cinfo->name;
		dai_link->name		= cinfo->name;
		dai_link->stream_name	= cinfo->name;
		dai_link->platform_name	= cinfo->platform;
		dai_link->codec_name	= cinfo->codec;
		dai_link->cpu_dai_name	= cinfo->cpu_dai.name;
		dai_link->codec_dai_name = cinfo->codec_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(&priv->snd_card, priv);

	ret = devm_snd_soc_register_card(&pdev->dev, &priv->snd_card);
	if (ret >= 0)
		return ret;

err:
	asoc_simple_card_unref(&priv->snd_card);
	return ret;
}

static int asoc_simple_card_remove(struct platform_device *pdev)
{
	struct snd_soc_card *card = platform_get_drvdata(pdev);
	struct simple_card_data *priv = snd_soc_card_get_drvdata(card);

	asoc_simple_card_remove_jack(&priv->hp_jack);
	asoc_simple_card_remove_jack(&priv->mic_jack);

	return asoc_simple_card_unref(card);
}

static const struct of_device_id asoc_simple_of_match[] = {
	{ .compatible = "simple-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");
MODULE_DESCRIPTION("ASoC Simple Sound Card");
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");