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Commit abd3147e authored by Kuninori Morimoto's avatar Kuninori Morimoto Committed by Mark Brown
Browse files

ASoC: add new simple-card-utils.c 



Current ALSA SoC has simple-card driver which is supporting both
platform and DT probe.
Now, some sound cards driver are created based on simple-card.
They have similar feature or function, but implemented separately
on each drivers. This is a waste of code.
OTOH, merging these driver into same driver is highly risk,
because it will be very difficult to keep compatibility.
More over, ALSA SoC want to have graph base of DT feature in the
future. Maybe it want to use simple-card like feature / function.
Because of these background, this patch creates simple-card
helper utils, and provides common function to each drivers.
1st is asoc_simple_card_parse_daifmt()

Signed-off-by: default avatarKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 9eac3618

include/sound/simple_card_utils.h

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Original line number Diff line number Diff line 
/*

 * simple_card_core.h

 *

 * 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.

 */

#ifndef __SIMPLE_CARD_CORE_H

#define __SIMPLE_CARD_CORE_H



#include <sound/soc.h>



int asoc_simple_card_parse_daifmt(struct device *dev,

				  struct device_node *node,

				  struct device_node *codec,

				  char *prefix,

				  unsigned int *retfmt);



#endif /* __SIMPLE_CARD_CORE_H */

sound/soc/generic/Kconfig

+3 −0
Original line number Diff line number Diff line 
config SND_SIMPLE_CARD_UTILS

       tristate



config SND_SIMPLE_CARD

	tristate "ASoC Simple sound card support"

	help

sound/soc/generic/Makefile

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obj-$(CONFIG_SND_SIMPLE_CARD_UTILS) := simple-card-utils.o



snd-soc-simple-card-objs	:= simple-card.o



obj-$(CONFIG_SND_SIMPLE_CARD)	+= snd-soc-simple-card.o

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

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Original line number Diff line number Diff line 
/*

 * 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/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);