[mirror_ubuntu-zesty-kernel.git] / sound / soc / generic / 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/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <sound/simple_card.h>
#include <sound/soc-dai.h>
#include <sound/soc.h>

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;
	} *dai_props;
	unsigned int mclk_fs;
	struct snd_soc_dai_link dai_link[];	/* dynamically allocated */
};

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 simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
	unsigned int mclk;
	int ret = 0;

	if (priv->mclk_fs) {
		mclk = params_rate(params) * priv->mclk_fs;
		ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
					     SND_SOC_CLOCK_IN);
	}

	return ret;
}

static struct snd_soc_ops asoc_simple_card_ops = {
	.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->fmt) {
		ret = snd_soc_dai_set_fmt(dai, set->fmt);
		if (ret && ret != -ENOTSUPP) {
			dev_err(dai->dev, "simple-card: set_fmt error\n");
			goto err;
		}
	}

	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, 0, 0,
						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 num, ret;

	num = rtd - rtd->card->rtd;
	dai_props = &priv->dai_props[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;

	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)
{
	struct device_node *node;
	struct clk *clk;
	u32 val;
	int ret;

	/*
	 * get node via "sound-dai = <&phandle port>"
	 * it will be used as xxx_of_node on soc_bind_dai_link()
	 */
	node = of_parse_phandle(np, "sound-dai", 0);
	if (!node)
		return -ENODEV;
	*p_node = node;

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

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

	/*
	 * 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);
	} else if (!of_property_read_u32(np, "system-clock-frequency", &val)) {
		dai->sysclk = val;
	} else {
		clk = of_clk_get(node, 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 device *dev,
					struct snd_soc_dai_link *dai_link,
					struct simple_dai_props *dai_props,
					bool is_top_level_node)
{
	struct device_node *np = NULL;
	struct device_node *bitclkmaster = NULL;
	struct device_node *framemaster = NULL;
	unsigned int daifmt;
	char *name;
	char prop[128];
	char *prefix = "";
	int ret;

	if (is_top_level_node)
		prefix = "simple-audio-card,";

	daifmt = snd_soc_of_parse_daifmt(node, prefix,
					 &bitclkmaster, &framemaster);
	daifmt &= ~SND_SOC_DAIFMT_MASTER_MASK;

	snprintf(prop, sizeof(prop), "%scpu", prefix);
	np = of_get_child_by_name(node, prop);
	if (!np) {
		ret = -EINVAL;
		dev_err(dev, "%s: Can't find %s DT node\n", __func__, prop);
		goto dai_link_of_err;
	}

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

	dai_props->cpu_dai.fmt = daifmt;
	switch (((np == bitclkmaster) << 4) | (np == framemaster)) {
	case 0x11:
		dai_props->cpu_dai.fmt |= SND_SOC_DAIFMT_CBS_CFS;
		break;
	case 0x10:
		dai_props->cpu_dai.fmt |= SND_SOC_DAIFMT_CBS_CFM;
		break;
	case 0x01:
		dai_props->cpu_dai.fmt |= SND_SOC_DAIFMT_CBM_CFS;
		break;
	default:
		dai_props->cpu_dai.fmt |= SND_SOC_DAIFMT_CBM_CFM;
		break;
	}

	of_node_put(np);
	snprintf(prop, sizeof(prop), "%scodec", prefix);
	np = of_get_child_by_name(node, prop);
	if (!np) {
		ret = -EINVAL;
		dev_err(dev, "%s: Can't find %s DT node\n", __func__, prop);
		goto dai_link_of_err;
	}

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

	if (strlen(prefix) && !bitclkmaster && !framemaster) {
		/* No dai-link level and master setting was not found from
		   sound node level, revert back to legacy DT parsing and
		   take the settings from codec node. */
		dev_dbg(dev, "%s: Revert to legacy daifmt parsing\n",
			__func__);
		dai_props->cpu_dai.fmt = dai_props->codec_dai.fmt =
			snd_soc_of_parse_daifmt(np, NULL, NULL, NULL) |
			(daifmt & ~SND_SOC_DAIFMT_CLOCK_MASK);
	} else {
		dai_props->codec_dai.fmt = daifmt;
		switch (((np == bitclkmaster) << 4) | (np == framemaster)) {
		case 0x11:
			dai_props->codec_dai.fmt |= SND_SOC_DAIFMT_CBM_CFM;
			break;
		case 0x10:
			dai_props->codec_dai.fmt |= SND_SOC_DAIFMT_CBM_CFS;
			break;
		case 0x01:
			dai_props->codec_dai.fmt |= SND_SOC_DAIFMT_CBS_CFM;
			break;
		default:
			dai_props->codec_dai.fmt |= SND_SOC_DAIFMT_CBS_CFS;
			break;
		}
	}

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

	/* simple-card assumes platform == cpu */
	dai_link->platform_of_node = dai_link->cpu_of_node;

	/* Link name is created from CPU/CODEC dai name */
	name = devm_kzalloc(dev,
			    strlen(dai_link->cpu_dai_name)   +
			    strlen(dai_link->codec_dai_name) + 2,
			    GFP_KERNEL);
	sprintf(name, "%s-%s", dai_link->cpu_dai_name,
				dai_link->codec_dai_name);
	dai_link->name = dai_link->stream_name = name;
	dai_link->ops = &asoc_simple_card_ops;

	dev_dbg(dev, "\tname : %s\n", dai_link->stream_name);
	dev_dbg(dev, "\tcpu : %s / %04x / %d\n",
		dai_link->cpu_dai_name,
		dai_props->cpu_dai.fmt,
		dai_props->cpu_dai.sysclk);
	dev_dbg(dev, "\tcodec : %s / %04x / %d\n",
		dai_link->codec_dai_name,
		dai_props->codec_dai.fmt,
		dai_props->codec_dai.sysclk);

dai_link_of_err:
	if (np)
		of_node_put(np);
	if (bitclkmaster)
		of_node_put(bitclkmaster);
	if (framemaster)
		of_node_put(framemaster);
	return ret;
}

static int asoc_simple_card_parse_of(struct device_node *node,
				     struct simple_card_data *priv,
				     struct device *dev,
				     int multi)
{
	struct snd_soc_dai_link *dai_link = priv->snd_card.dai_link;
	struct simple_dai_props *dai_props = priv->dai_props;
	u32 val;
	int ret;

	/* parsing the card name from DT */
	snd_soc_of_parse_card_name(&priv->snd_card, "simple-audio-card,name");

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

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

	/* Factor to mclk, used in hw_params() */
	ret = of_property_read_u32(node, "simple-audio-card,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 : "");

	if (multi) {
		struct device_node *np = NULL;
		int i;
		for (i = 0; (np = of_get_next_child(node, np)); i++) {
			dev_dbg(dev, "\tlink %d:\n", i);
			ret = asoc_simple_card_dai_link_of(np, dev,
							   dai_link + i,
							   dai_props + i,
							   false);
			if (ret < 0) {
				of_node_put(np);
				return ret;
			}
		}
	} else {
		ret = asoc_simple_card_dai_link_of(node, dev,
						   dai_link, dai_props, true);
		if (ret < 0)
			return ret;
	}

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

	return 0;
}

/* update the reference count of the devices nodes at end of probe */
static int asoc_simple_card_unref(struct platform_device *pdev)
{
	struct snd_soc_card *card = platform_get_drvdata(pdev);
	struct snd_soc_dai_link *dai_link;
	struct device_node *np;
	int num_links;

	for (num_links = 0, dai_link = card->dai_link;
	     num_links < card->num_links;
	     num_links++, dai_link++) {
		np = (struct device_node *) dai_link->cpu_of_node;
		if (np)
			of_node_put(np);
		np = (struct device_node *) dai_link->codec_of_node;
		if (np)
			of_node_put(np);
	}
	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, multi, ret;

	/* get the number of DAI links */
	if (np && of_get_child_by_name(np, "simple-audio-card,dai-link")) {
		num_links = of_get_child_count(np);
		multi = 1;
	} else {
		num_links = 1;
		multi = 0;
	}

	/* 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, dev, multi);
		if (ret < 0) {
			if (ret != -EPROBE_DEFER)
				dev_err(dev, "parse error %d\n", ret);
			goto err;
		}

		/*
		 * 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 to escape name matching.
		 * see
		 *	fmt_single_name()
		 *	fmt_multiple_name()
		 */
		if (num_links == 1)
			dai_link->cpu_dai_name = NULL;

	} 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;
		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));

		priv->dai_props->cpu_dai.fmt	|= cinfo->daifmt;
		priv->dai_props->codec_dai.fmt	|= cinfo->daifmt;
	}

	/*
	 * init snd_soc_dai_link
	 */
	dai_link->init = asoc_simple_card_dai_init;

	snd_soc_card_set_drvdata(&priv->snd_card, priv);

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

err:
	asoc_simple_card_unref(pdev);
	return ret;
}

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",
		.owner = THIS_MODULE,
		.of_match_table = asoc_simple_of_match,
	},
	.probe = asoc_simple_card_probe,
};

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>");
Commit	Line	Data
	1	/*
	2	* ASoC simple sound card support
	3	*
	4	* Copyright (C) 2012 Renesas Solutions Corp.
	5	* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#include <linux/clk.h>
	12	#include <linux/device.h>
	13	#include <linux/module.h>
	14	#include <linux/of.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/string.h>
	17	#include <sound/simple_card.h>
	18	#include <sound/soc-dai.h>
	19	#include <sound/soc.h>
	20
	21	struct simple_card_data {
	22	struct snd_soc_card snd_card;
	23	struct simple_dai_props {
	24	struct asoc_simple_dai cpu_dai;
	25	struct asoc_simple_dai codec_dai;
	26	} *dai_props;
	27	unsigned int mclk_fs;
	28	struct snd_soc_dai_link dai_link[]; /* dynamically allocated */
	29	};
	30
	31	static int asoc_simple_card_hw_params(struct snd_pcm_substream *substream,
	32	struct snd_pcm_hw_params *params)
	33	{
	34	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	35	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	36	struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
	37	unsigned int mclk;
	38	int ret = 0;
	39
	40	if (priv->mclk_fs) {
	41	mclk = params_rate(params) * priv->mclk_fs;
	42	ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
	43	SND_SOC_CLOCK_IN);
	44	}
	45
	46	return ret;
	47	}
	48
	49	static struct snd_soc_ops asoc_simple_card_ops = {
	50	.hw_params = asoc_simple_card_hw_params,
	51	};
	52
	53	static int __asoc_simple_card_dai_init(struct snd_soc_dai *dai,
	54	struct asoc_simple_dai *set)
	55	{
	56	int ret;
	57
	58	if (set->fmt) {
	59	ret = snd_soc_dai_set_fmt(dai, set->fmt);
	60	if (ret && ret != -ENOTSUPP) {
	61	dev_err(dai->dev, "simple-card: set_fmt error\n");
	62	goto err;
	63	}
	64	}
	65
	66	if (set->sysclk) {
	67	ret = snd_soc_dai_set_sysclk(dai, 0, set->sysclk, 0);
	68	if (ret && ret != -ENOTSUPP) {
	69	dev_err(dai->dev, "simple-card: set_sysclk error\n");
	70	goto err;
	71	}
	72	}
	73
	74	if (set->slots) {
	75	ret = snd_soc_dai_set_tdm_slot(dai, 0, 0,
	76	set->slots,
	77	set->slot_width);
	78	if (ret && ret != -ENOTSUPP) {
	79	dev_err(dai->dev, "simple-card: set_tdm_slot error\n");
	80	goto err;
	81	}
	82	}
	83
	84	ret = 0;
	85
	86	err:
	87	return ret;
	88	}
	89
	90	static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
	91	{
	92	struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
	93	struct snd_soc_dai *codec = rtd->codec_dai;
	94	struct snd_soc_dai *cpu = rtd->cpu_dai;
	95	struct simple_dai_props *dai_props;
	96	int num, ret;
	97
	98	num = rtd - rtd->card->rtd;
	99	dai_props = &priv->dai_props[num];
	100	ret = __asoc_simple_card_dai_init(codec, &dai_props->codec_dai);
	101	if (ret < 0)
	102	return ret;
	103
	104	ret = __asoc_simple_card_dai_init(cpu, &dai_props->cpu_dai);
	105	if (ret < 0)
	106	return ret;
	107
	108	return 0;
	109	}
	110
	111	static int
	112	asoc_simple_card_sub_parse_of(struct device_node *np,
	113	struct asoc_simple_dai *dai,
	114	struct device_node **p_node,
	115	const char **name)
	116	{
	117	struct device_node *node;
	118	struct clk *clk;
	119	u32 val;
	120	int ret;
	121
	122	/*
	123	* get node via "sound-dai = <&phandle port>"
	124	* it will be used as xxx_of_node on soc_bind_dai_link()
	125	*/
	126	node = of_parse_phandle(np, "sound-dai", 0);
	127	if (!node)
	128	return -ENODEV;
	129	*p_node = node;
	130
	131	/* get dai->name */
	132	ret = snd_soc_of_get_dai_name(np, name);
	133	if (ret < 0)
	134	return ret;
	135
	136	/* parse TDM slot */
	137	ret = snd_soc_of_parse_tdm_slot(np, &dai->slots, &dai->slot_width);
	138	if (ret)
	139	return ret;
	140
	141	/*
	142	* dai->sysclk come from
	143	* "clocks = <&xxx>" (if system has common clock)
	144	* or "system-clock-frequency = <xxx>"
	145	* or device's module clock.
	146	*/
	147	if (of_property_read_bool(np, "clocks")) {
	148	clk = of_clk_get(np, 0);
	149	if (IS_ERR(clk)) {
	150	ret = PTR_ERR(clk);
	151	return ret;
	152	}
	153
	154	dai->sysclk = clk_get_rate(clk);
	155	} else if (!of_property_read_u32(np, "system-clock-frequency", &val)) {
	156	dai->sysclk = val;
	157	} else {
	158	clk = of_clk_get(node, 0);
	159	if (!IS_ERR(clk))
	160	dai->sysclk = clk_get_rate(clk);
	161	}
	162
	163	return 0;
	164	}
	165
	166	static int asoc_simple_card_dai_link_of(struct device_node *node,
	167	struct device *dev,
	168	struct snd_soc_dai_link *dai_link,
	169	struct simple_dai_props *dai_props,
	170	bool is_top_level_node)
	171	{
	172	struct device_node *np = NULL;
	173	struct device_node *bitclkmaster = NULL;
	174	struct device_node *framemaster = NULL;
	175	unsigned int daifmt;
	176	char *name;
	177	char prop[128];
	178	char *prefix = "";
	179	int ret;
	180
	181	if (is_top_level_node)
	182	prefix = "simple-audio-card,";
	183
	184	daifmt = snd_soc_of_parse_daifmt(node, prefix,
	185	&bitclkmaster, &framemaster);
	186	daifmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
	187
	188	snprintf(prop, sizeof(prop), "%scpu", prefix);
	189	np = of_get_child_by_name(node, prop);
	190	if (!np) {
	191	ret = -EINVAL;
	192	dev_err(dev, "%s: Can't find %s DT node\n", __func__, prop);
	193	goto dai_link_of_err;
	194	}
	195
	196	ret = asoc_simple_card_sub_parse_of(np, &dai_props->cpu_dai,
	197	&dai_link->cpu_of_node,
	198	&dai_link->cpu_dai_name);
	199	if (ret < 0)
	200	goto dai_link_of_err;
	201
	202	dai_props->cpu_dai.fmt = daifmt;
	203	switch (((np == bitclkmaster) << 4) \| (np == framemaster)) {
	204	case 0x11:
	205	dai_props->cpu_dai.fmt \|= SND_SOC_DAIFMT_CBS_CFS;
	206	break;
	207	case 0x10:
	208	dai_props->cpu_dai.fmt \|= SND_SOC_DAIFMT_CBS_CFM;
	209	break;
	210	case 0x01:
	211	dai_props->cpu_dai.fmt \|= SND_SOC_DAIFMT_CBM_CFS;
	212	break;
	213	default:
	214	dai_props->cpu_dai.fmt \|= SND_SOC_DAIFMT_CBM_CFM;
	215	break;
	216	}
	217
	218	of_node_put(np);
	219	snprintf(prop, sizeof(prop), "%scodec", prefix);
	220	np = of_get_child_by_name(node, prop);
	221	if (!np) {
	222	ret = -EINVAL;
	223	dev_err(dev, "%s: Can't find %s DT node\n", __func__, prop);
	224	goto dai_link_of_err;
	225	}
	226
	227	ret = asoc_simple_card_sub_parse_of(np, &dai_props->codec_dai,
	228	&dai_link->codec_of_node,
	229	&dai_link->codec_dai_name);
	230	if (ret < 0)
	231	goto dai_link_of_err;
	232
	233	if (strlen(prefix) && !bitclkmaster && !framemaster) {
	234	/* No dai-link level and master setting was not found from
	235	sound node level, revert back to legacy DT parsing and
	236	take the settings from codec node. */
	237	dev_dbg(dev, "%s: Revert to legacy daifmt parsing\n",
	238	__func__);
	239	dai_props->cpu_dai.fmt = dai_props->codec_dai.fmt =
	240	snd_soc_of_parse_daifmt(np, NULL, NULL, NULL) \|
	241	(daifmt & ~SND_SOC_DAIFMT_CLOCK_MASK);
	242	} else {
	243	dai_props->codec_dai.fmt = daifmt;
	244	switch (((np == bitclkmaster) << 4) \| (np == framemaster)) {
	245	case 0x11:
	246	dai_props->codec_dai.fmt \|= SND_SOC_DAIFMT_CBM_CFM;
	247	break;
	248	case 0x10:
	249	dai_props->codec_dai.fmt \|= SND_SOC_DAIFMT_CBM_CFS;
	250	break;
	251	case 0x01:
	252	dai_props->codec_dai.fmt \|= SND_SOC_DAIFMT_CBS_CFM;
	253	break;
	254	default:
	255	dai_props->codec_dai.fmt \|= SND_SOC_DAIFMT_CBS_CFS;
	256	break;
	257	}
	258	}
	259
	260	if (!dai_link->cpu_dai_name \|\| !dai_link->codec_dai_name) {
	261	ret = -EINVAL;
	262	goto dai_link_of_err;
	263	}
	264
	265	/* simple-card assumes platform == cpu */
	266	dai_link->platform_of_node = dai_link->cpu_of_node;
	267
	268	/* Link name is created from CPU/CODEC dai name */
	269	name = devm_kzalloc(dev,
	270	strlen(dai_link->cpu_dai_name) +
	271	strlen(dai_link->codec_dai_name) + 2,
	272	GFP_KERNEL);
	273	sprintf(name, "%s-%s", dai_link->cpu_dai_name,
	274	dai_link->codec_dai_name);
	275	dai_link->name = dai_link->stream_name = name;
	276	dai_link->ops = &asoc_simple_card_ops;
	277
	278	dev_dbg(dev, "\tname : %s\n", dai_link->stream_name);
	279	dev_dbg(dev, "\tcpu : %s / %04x / %d\n",
	280	dai_link->cpu_dai_name,
	281	dai_props->cpu_dai.fmt,
	282	dai_props->cpu_dai.sysclk);
	283	dev_dbg(dev, "\tcodec : %s / %04x / %d\n",
	284	dai_link->codec_dai_name,
	285	dai_props->codec_dai.fmt,
	286	dai_props->codec_dai.sysclk);
	287
	288	dai_link_of_err:
	289	if (np)
	290	of_node_put(np);
	291	if (bitclkmaster)
	292	of_node_put(bitclkmaster);
	293	if (framemaster)
	294	of_node_put(framemaster);
	295	return ret;
	296	}
	297
	298	static int asoc_simple_card_parse_of(struct device_node *node,
	299	struct simple_card_data *priv,
	300	struct device *dev,
	301	int multi)
	302	{
	303	struct snd_soc_dai_link *dai_link = priv->snd_card.dai_link;
	304	struct simple_dai_props *dai_props = priv->dai_props;
	305	u32 val;
	306	int ret;
	307
	308	/* parsing the card name from DT */
	309	snd_soc_of_parse_card_name(&priv->snd_card, "simple-audio-card,name");
	310
	311	/* off-codec widgets */
	312	if (of_property_read_bool(node, "simple-audio-card,widgets")) {
	313	ret = snd_soc_of_parse_audio_simple_widgets(&priv->snd_card,
	314	"simple-audio-card,widgets");
	315	if (ret)
	316	return ret;
	317	}
	318
	319	/* DAPM routes */
	320	if (of_property_read_bool(node, "simple-audio-card,routing")) {
	321	ret = snd_soc_of_parse_audio_routing(&priv->snd_card,
	322	"simple-audio-card,routing");
	323	if (ret)
	324	return ret;
	325	}
	326
	327	/* Factor to mclk, used in hw_params() */
	328	ret = of_property_read_u32(node, "simple-audio-card,mclk-fs", &val);
	329	if (ret == 0)
	330	priv->mclk_fs = val;
	331
	332	dev_dbg(dev, "New simple-card: %s\n", priv->snd_card.name ?
	333	priv->snd_card.name : "");
	334
	335	if (multi) {
	336	struct device_node *np = NULL;
	337	int i;
	338	for (i = 0; (np = of_get_next_child(node, np)); i++) {
	339	dev_dbg(dev, "\tlink %d:\n", i);
	340	ret = asoc_simple_card_dai_link_of(np, dev,
	341	dai_link + i,
	342	dai_props + i,
	343	false);
	344	if (ret < 0) {
	345	of_node_put(np);
	346	return ret;
	347	}
	348	}
	349	} else {
	350	ret = asoc_simple_card_dai_link_of(node, dev,
	351	dai_link, dai_props, true);
	352	if (ret < 0)
	353	return ret;
	354	}
	355
	356	if (!priv->snd_card.name)
	357	priv->snd_card.name = priv->snd_card.dai_link->name;
	358
	359	return 0;
	360	}
	361
	362	/* update the reference count of the devices nodes at end of probe */
	363	static int asoc_simple_card_unref(struct platform_device *pdev)
	364	{
	365	struct snd_soc_card *card = platform_get_drvdata(pdev);
	366	struct snd_soc_dai_link *dai_link;
	367	struct device_node *np;
	368	int num_links;
	369
	370	for (num_links = 0, dai_link = card->dai_link;
	371	num_links < card->num_links;
	372	num_links++, dai_link++) {
	373	np = (struct device_node *) dai_link->cpu_of_node;
	374	if (np)
	375	of_node_put(np);
	376	np = (struct device_node *) dai_link->codec_of_node;
	377	if (np)
	378	of_node_put(np);
	379	}
	380	return 0;
	381	}
	382
	383	static int asoc_simple_card_probe(struct platform_device *pdev)
	384	{
	385	struct simple_card_data *priv;
	386	struct snd_soc_dai_link *dai_link;
	387	struct device_node *np = pdev->dev.of_node;
	388	struct device *dev = &pdev->dev;
	389	int num_links, multi, ret;
	390
	391	/* get the number of DAI links */
	392	if (np && of_get_child_by_name(np, "simple-audio-card,dai-link")) {
	393	num_links = of_get_child_count(np);
	394	multi = 1;
	395	} else {
	396	num_links = 1;
	397	multi = 0;
	398	}
	399
	400	/* allocate the private data and the DAI link array */
	401	priv = devm_kzalloc(dev,
	402	sizeof(priv) + sizeof(dai_link) * num_links,
	403	GFP_KERNEL);
	404	if (!priv)
	405	return -ENOMEM;
	406
	407	/*
	408	* init snd_soc_card
	409	*/
	410	priv->snd_card.owner = THIS_MODULE;
	411	priv->snd_card.dev = dev;
	412	dai_link = priv->dai_link;
	413	priv->snd_card.dai_link = dai_link;
	414	priv->snd_card.num_links = num_links;
	415
	416	/* get room for the other properties */
	417	priv->dai_props = devm_kzalloc(dev,
	418	sizeof(priv->dai_props) num_links,
	419	GFP_KERNEL);
	420	if (!priv->dai_props)
	421	return -ENOMEM;
	422
	423	if (np && of_device_is_available(np)) {
	424
	425	ret = asoc_simple_card_parse_of(np, priv, dev, multi);
	426	if (ret < 0) {
	427	if (ret != -EPROBE_DEFER)
	428	dev_err(dev, "parse error %d\n", ret);
	429	goto err;
	430	}
	431
	432	/*
	433	* soc_bind_dai_link() will check cpu name
	434	* after of_node matching if dai_link has cpu_dai_name.
	435	* but, it will never match if name was created by fmt_single_name()
	436	* remove cpu_dai_name to escape name matching.
	437	* see
	438	* fmt_single_name()
	439	* fmt_multiple_name()
	440	*/
	441	if (num_links == 1)
	442	dai_link->cpu_dai_name = NULL;
	443
	444	} else {
	445	struct asoc_simple_card_info *cinfo;
	446
	447	cinfo = dev->platform_data;
	448	if (!cinfo) {
	449	dev_err(dev, "no info for asoc-simple-card\n");
	450	return -EINVAL;
	451	}
	452
	453	if (!cinfo->name \|\|
	454	!cinfo->codec_dai.name \|\|
	455	!cinfo->codec \|\|
	456	!cinfo->platform \|\|
	457	!cinfo->cpu_dai.name) {
	458	dev_err(dev, "insufficient asoc_simple_card_info settings\n");
	459	return -EINVAL;
	460	}
	461
	462	priv->snd_card.name = (cinfo->card) ? cinfo->card : cinfo->name;
	463	dai_link->name = cinfo->name;
	464	dai_link->stream_name = cinfo->name;
	465	dai_link->platform_name = cinfo->platform;
	466	dai_link->codec_name = cinfo->codec;
	467	dai_link->cpu_dai_name = cinfo->cpu_dai.name;
	468	dai_link->codec_dai_name = cinfo->codec_dai.name;
	469	memcpy(&priv->dai_props->cpu_dai, &cinfo->cpu_dai,
	470	sizeof(priv->dai_props->cpu_dai));
	471	memcpy(&priv->dai_props->codec_dai, &cinfo->codec_dai,
	472	sizeof(priv->dai_props->codec_dai));
	473
	474	priv->dai_props->cpu_dai.fmt \|= cinfo->daifmt;
	475	priv->dai_props->codec_dai.fmt \|= cinfo->daifmt;
	476	}
	477
	478	/*
	479	* init snd_soc_dai_link
	480	*/
	481	dai_link->init = asoc_simple_card_dai_init;
	482
	483	snd_soc_card_set_drvdata(&priv->snd_card, priv);
	484
	485	ret = devm_snd_soc_register_card(&pdev->dev, &priv->snd_card);
	486
	487	err:
	488	asoc_simple_card_unref(pdev);
	489	return ret;
	490	}
	491
	492	static const struct of_device_id asoc_simple_of_match[] = {
	493	{ .compatible = "simple-audio-card", },
	494	{},
	495	};
	496	MODULE_DEVICE_TABLE(of, asoc_simple_of_match);
	497
	498	static struct platform_driver asoc_simple_card = {
	499	.driver = {
	500	.name = "asoc-simple-card",
	501	.owner = THIS_MODULE,
	502	.of_match_table = asoc_simple_of_match,
	503	},
	504	.probe = asoc_simple_card_probe,
	505	};
	506
	507	module_platform_driver(asoc_simple_card);
	508
	509	MODULE_ALIAS("platform:asoc-simple-card");
	510	MODULE_LICENSE("GPL");
	511	MODULE_DESCRIPTION("ASoC Simple Sound Card");
	512	MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");