ASoC: add generic simple-card support

Current ASoC requires card.c file to each platforms in order to
specifies its CPU and Codecs pair.
But the differences between these were only value/strings of setting.
In order to reduce duplicate driver, this patch adds generic/simple-card.

Signed-off-by: Kuninori Morimoto <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

include/sound/simple_card.h

···
+/*
+ * ASoC simple sound card support
+ *
+ * Copyright (C) 2012 Renesas Solutions Corp.
+ * Kuninori Morimoto <[e-mail]>
+ *
+ * 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_H
+#define __SIMPLE_CARD_H
+
+#include <sound/soc.h>
+
+struct asoc_simple_dai_init_info {
+	unsigned int fmt;
+	unsigned int cpu_daifmt;
+	unsigned int codec_daifmt;
+	unsigned int sysclk;
+};
+
+struct asoc_simple_card_info {
+	const char *name;
+	const char *card;
+	const char *cpu_dai;
+	const char *codec;
+	const char *platform;
+	const char *codec_dai;
+	struct asoc_simple_dai_init_info *init; /* for snd_link.init */
+
+	/* used in simple-card.c */
+	struct snd_soc_dai_link snd_link;
+	struct snd_soc_card snd_card;
+};
+
+#endif /* __SIMPLE_CARD_H */

sound/soc/Kconfig

···
 # Supported codecs
 source "sound/soc/codecs/Kconfig"
 
+# generic frame-work
+source "sound/soc/generic/Kconfig"
+
 endif	# SND_SOC
 

sound/soc/Makefile

···
 
 obj-$(CONFIG_SND_SOC)	+= snd-soc-core.o
 obj-$(CONFIG_SND_SOC)	+= codecs/
+obj-$(CONFIG_SND_SOC)	+= generic/
 obj-$(CONFIG_SND_SOC)	+= atmel/
 obj-$(CONFIG_SND_SOC)	+= au1x/
 obj-$(CONFIG_SND_SOC)	+= blackfin/

sound/soc/generic/Kconfig

···
+config SND_SIMPLE_CARD
+	tristate "ASoC Simple sound card support"
+	help
+	  This option enables generic simple sound card support

sound/soc/generic/Makefile

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

sound/soc/generic/simple-card.c

···
+/*
+ * ASoC simple sound card support
+ *
+ * Copyright (C) 2012 Renesas Solutions Corp.
+ * Kuninori Morimoto <[e-mail]>
+ *
+ * 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/platform_device.h>
+#include <linux/module.h>
+#include <sound/simple_card.h>
+
+#define asoc_simple_get_card_info(p) \
+	container_of(p->dai_link, struct asoc_simple_card_info, snd_link)
+
+static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct asoc_simple_card_info *cinfo = asoc_simple_get_card_info(rtd);
+	struct asoc_simple_dai_init_info *iinfo = cinfo->init;
+	struct snd_soc_dai *codec = rtd->codec_dai;
+	struct snd_soc_dai *cpu = rtd->cpu_dai;
+	unsigned int cpu_daifmt = iinfo->fmt | iinfo->cpu_daifmt;
+	unsigned int codec_daifmt = iinfo->fmt | iinfo->codec_daifmt;
+	int ret;
+
+	if (codec_daifmt) {
+		ret = snd_soc_dai_set_fmt(codec, codec_daifmt);
+		if (ret < 0)
+			return ret;
+	}
+
+	if (iinfo->sysclk) {
+		ret = snd_soc_dai_set_sysclk(codec, 0, iinfo->sysclk, 0);
+		if (ret < 0)
+			return ret;
+	}
+
+	if (cpu_daifmt) {
+		ret = snd_soc_dai_set_fmt(cpu, cpu_daifmt);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int asoc_simple_card_probe(struct platform_device *pdev)
+{
+	struct asoc_simple_card_info *cinfo = pdev->dev.platform_data;
+
+	if (!cinfo) {
+		dev_err(&pdev->dev, "no info for asoc-simple-card\n");
+		return -EINVAL;
+	}
+
+	if (!cinfo->name	||
+	    !cinfo->card	||
+	    !cinfo->cpu_dai	||
+	    !cinfo->codec	||
+	    !cinfo->platform	||
+	    !cinfo->codec_dai) {
+		dev_err(&pdev->dev, "insufficient asoc_simple_card_info settings\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * init snd_soc_dai_link
+	 */
+	cinfo->snd_link.name		= cinfo->name;
+	cinfo->snd_link.stream_name	= cinfo->name;
+	cinfo->snd_link.cpu_dai_name	= cinfo->cpu_dai;
+	cinfo->snd_link.platform_name	= cinfo->platform;
+	cinfo->snd_link.codec_name	= cinfo->codec;
+	cinfo->snd_link.codec_dai_name	= cinfo->codec_dai;
+
+	/* enable snd_link.init if cinfo has settings */
+	if (cinfo->init)
+		cinfo->snd_link.init	= asoc_simple_card_dai_init;
+
+	/*
+	 * init snd_soc_card
+	 */
+	cinfo->snd_card.name		= cinfo->card;
+	cinfo->snd_card.owner		= THIS_MODULE;
+	cinfo->snd_card.dai_link	= &cinfo->snd_link;
+	cinfo->snd_card.num_links	= 1;
+	cinfo->snd_card.dev		= &pdev->dev;
+
+	return snd_soc_register_card(&cinfo->snd_card);
+}
+
+static int asoc_simple_card_remove(struct platform_device *pdev)
+{
+	struct asoc_simple_card_info *cinfo = pdev->dev.platform_data;
+
+	return snd_soc_unregister_card(&cinfo->snd_card);
+}
+
+static struct platform_driver asoc_simple_card = {
+	.driver = {
+		.name	= "asoc-simple-card",
+	},
+	.probe		= asoc_simple_card_probe,
+	.remove		= asoc_simple_card_remove,
+};
+
+module_platform_driver(asoc_simple_card);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("ASoC Simple Sound Card");
+MODULE_AUTHOR("Kuninori Morimoto <[e-mail]>");