ASoC: ADS117x ADC driver

This patch adds support for the TI ADS117x family of multichannel ADCs
and was sponsored by Shotspotter Inc.

Signed-off-by: Graeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/Kconfig

@@ -15,6 +15,7 @@ config SND_SOC_ALL_CODECS
 	select SND_SOC_AD1836 if SPI_MASTER
 	select SND_SOC_AD1938 if SPI_MASTER
 	select SND_SOC_AD1980 if SND_SOC_AC97_BUS
+	select SND_SOC_ADS117X
 	select SND_SOC_AD73311 if I2C
 	select SND_SOC_AK4104 if SPI_MASTER
 	select SND_SOC_AK4535 if I2C
@@ -91,6 +92,9 @@ config SND_SOC_AD1980
 
 config SND_SOC_AD73311
 	tristate
+
+config SND_SOC_ADS117X
+	tristate
 
 config SND_SOC_AK4104
 	tristate

sound/soc/codecs/Makefile

@@ -3,6 +3,7 @@ snd-soc-ad1836-objs := ad1836.o
 snd-soc-ad1938-objs := ad1938.o
 snd-soc-ad1980-objs := ad1980.o
 snd-soc-ad73311-objs := ad73311.o
+snd-soc-ads117x-objs := ads117x.o
 snd-soc-ak4104-objs := ak4104.o
 snd-soc-ak4535-objs := ak4535.o
 snd-soc-ak4642-objs := ak4642.o
@@ -58,6 +59,7 @@ obj-$(CONFIG_SND_SOC_AD1836)	+= snd-soc-ad1836.o
 obj-$(CONFIG_SND_SOC_AD1938)	+= snd-soc-ad1938.o
 obj-$(CONFIG_SND_SOC_AD1980)	+= snd-soc-ad1980.o
 obj-$(CONFIG_SND_SOC_AD73311) += snd-soc-ad73311.o
+obj-$(CONFIG_SND_SOC_ADS117X)	+= snd-soc-ads117x.o
 obj-$(CONFIG_SND_SOC_AK4104)	+= snd-soc-ak4104.o
 obj-$(CONFIG_SND_SOC_AK4535)	+= snd-soc-ak4535.o
 obj-$(CONFIG_SND_SOC_AK4642)	+= snd-soc-ak4642.o

sound/soc/codecs/ads117x.c

@@ -0,0 +1,127 @@
+/*
+ * ads117x.c  --  Driver for ads1174/8 ADC chips
+ *
+ * Copyright 2009 ShotSpotter Inc.
+ * Author: Graeme Gregory <gg@slimlogic.co.uk>
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include "ads117x.h"
+
+#define ADS117X_RATES (SNDRV_PCM_RATE_8000_48000)
+
+#define ADS117X_FORMATS (SNDRV_PCM_FMTBIT_S16_LE)
+
+struct snd_soc_dai ads117x_dai = {
+/* ADC */
+	.name = "ADS117X ADC",
+	.id = 1,
+	.capture = {
+		.stream_name = "Capture",
+		.channels_min = 1,
+		.channels_max = 32,
+		.rates = ADS117X_RATES,
+		.formats = ADS117X_FORMATS,},
+};
+EXPORT_SYMBOL_GPL(ads117x_dai);
+
+/*
+ * initialise the ads117x driver
+ */
+static int ads117x_init(struct snd_soc_device *socdev)
+{
+	struct snd_soc_codec *codec = socdev->card->codec;
+	int ret = 0;
+
+	codec->name = "ADS117X";
+	codec->owner = THIS_MODULE;
+	codec->dai = &ads117x_dai;
+	codec->num_dai = 1;
+
+	/* register pcms */
+	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+	if (ret < 0) {
+		printk(KERN_ERR "ads117x: failed to create pcms\n");
+		return ret;
+	}
+
+	ret = snd_soc_init_card(socdev);
+	if (ret < 0) {
+		printk(KERN_ERR "ads117x: failed to register card\n");
+		goto card_err;
+	}
+	return ret;
+
+card_err:
+	snd_soc_free_pcms(socdev);
+	return ret;
+}
+
+static int ads117x_probe(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_codec *codec;
+	int ret;
+
+	pr_info("ads117x ADC\n");
+
+	codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
+	if (codec == NULL)
+		return -ENOMEM;
+
+	socdev->card->codec = codec;
+	mutex_init(&codec->mutex);
+	INIT_LIST_HEAD(&codec->dapm_widgets);
+	INIT_LIST_HEAD(&codec->dapm_paths);
+
+	ret = ads117x_init(socdev);
+	if (ret != 0)
+		kfree(codec);
+
+	return ret;
+}
+
+static int ads117x_remove(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_codec *codec = socdev->card->codec;
+
+	snd_soc_free_pcms(socdev);
+	kfree(codec);
+
+	return 0;
+}
+
+struct snd_soc_codec_device soc_codec_dev_ads117x = {
+	.probe =	ads117x_probe,
+	.remove =	ads117x_remove,
+};
+EXPORT_SYMBOL_GPL(soc_codec_dev_ads117x);
+
+static int __init ads117x_modinit(void)
+{
+	return snd_soc_register_dai(&ads117x_dai);
+}
+module_init(ads117x_modinit);
+
+static void __exit ads117x_exit(void)
+{
+	snd_soc_unregister_dai(&ads117x_dai);
+}
+module_exit(ads117x_exit);
+
+MODULE_DESCRIPTION("ASoC ads117x driver");
+MODULE_AUTHOR("Graeme Gregory");
+MODULE_LICENSE("GPL");

sound/soc/codecs/ads117x.h

@@ -0,0 +1,13 @@
+/*
+ * ads117x.h  --  Driver for ads1174/8 ADC chips
+ *
+ * Copyright 2009 ShotSpotter Inc.
+ * Author: Graeme Gregory <gg@slimlogic.co.uk>
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ */
+extern struct snd_soc_dai ads117x_dai;
+extern struct snd_soc_codec_device soc_codec_dev_ads117x;