linux/sound/soc/generic/simple-card-utils.c

/*
 * simple-card-core.c
 *
 * Copyright (c) 2016 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/module.h>
#include <linux/of.h>
#include <sound/simple_card_utils.h>

int asoc_simple_card_parse_daifmt(struct device *dev,
				  struct device_node *node,
				  struct device_node *codec,
				  char *prefix,
				  unsigned int *retfmt)
{
	struct device_node *bitclkmaster = NULL;
	struct device_node *framemaster = NULL;
	int prefix_len = prefix ? strlen(prefix) : 0;
	unsigned int daifmt;

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

	if (prefix_len && !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, "Revert to legacy daifmt parsing\n");

		daifmt = snd_soc_of_parse_daifmt(codec, NULL, NULL, NULL) |
			(daifmt & ~SND_SOC_DAIFMT_CLOCK_MASK);
	} else {
		if (codec == bitclkmaster)
			daifmt |= (codec == framemaster) ?
				SND_SOC_DAIFMT_CBM_CFM : SND_SOC_DAIFMT_CBM_CFS;
		else
			daifmt |= (codec == framemaster) ?
				SND_SOC_DAIFMT_CBS_CFM : SND_SOC_DAIFMT_CBS_CFS;
	}

	of_node_put(bitclkmaster);
	of_node_put(framemaster);

	*retfmt = daifmt;

	return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_card_parse_daifmt);

int asoc_simple_card_set_dailink_name(struct device *dev,
				      struct snd_soc_dai_link *dai_link,
				      const char *fmt, ...)
{
	va_list ap;
	char *name = NULL;
	int ret = -ENOMEM;

	va_start(ap, fmt);
	name = devm_kvasprintf(dev, GFP_KERNEL, fmt, ap);
	va_end(ap);

	if (name) {
		ret = 0;

		dai_link->name		= name;
		dai_link->stream_name	= name;
	}

	return ret;
}
EXPORT_SYMBOL_GPL(asoc_simple_card_set_dailink_name);

int asoc_simple_card_parse_card_name(struct snd_soc_card *card,
				     char *prefix)
{
	char prop[128];
	int ret;

	snprintf(prop, sizeof(prop), "%sname", prefix);

	/* Parse the card name from DT */
	ret = snd_soc_of_parse_card_name(card, prop);
	if (ret < 0)
		return ret;

	if (!card->name && card->dai_link)
		card->name = card->dai_link->name;

	return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_card_parse_card_name);

int asoc_simple_card_parse_clk(struct device_node *node,
			       struct device_node *dai_of_node,
			       struct asoc_simple_dai *simple_dai)
{
	struct clk *clk;
	u32 val;

	/*
	 * Parse dai->sysclk come from "clocks = <&xxx>"
	 * (if system has common clock)
	 *  or "system-clock-frequency = <xxx>"
	 *  or device's module clock.
	 */
	clk = of_clk_get(node, 0);
	if (!IS_ERR(clk)) {
		simple_dai->sysclk = clk_get_rate(clk);
		simple_dai->clk = clk;
	} else if (!of_property_read_u32(node, "system-clock-frequency", &val)) {
		simple_dai->sysclk = val;
	} else {
		clk = of_clk_get(dai_of_node, 0);
		if (!IS_ERR(clk))
			simple_dai->sysclk = clk_get_rate(clk);
	}

	return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_card_parse_clk);

int asoc_simple_card_parse_dai(struct device_node *node,
				    struct device_node **dai_of_node,
				    const char **dai_name,
				    const char *list_name,
				    const char *cells_name,
				    int *is_single_link)
{
	struct of_phandle_args args;
	int ret;

	if (!node)
		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(node, list_name, cells_name, 0, &args);
	if (ret)
		return ret;

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

	*dai_of_node = args.np;

	if (is_single_link)
		*is_single_link = !args.args_count;

	return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_card_parse_dai);

/* Module information */
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
MODULE_DESCRIPTION("ALSA SoC Simple Card Utils");
MODULE_LICENSE("GPL v2");