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>

4 files changed, 146 insertions, 0 deletions

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 4a3e8dcf24d9..52b005f8fed4 100644
--- a/sound/soc/codecs/Kconfig
+++ b/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
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index cacfc7692d7f..dbaecb133ac7 100644
--- a/sound/soc/codecs/Makefile
+++ b/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
diff --git a/sound/soc/codecs/ads117x.c b/sound/soc/codecs/ads117x.c
new file mode 100644
index 000000000000..f3230927dc66
--- /dev/null
+++ b/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");
diff --git a/sound/soc/codecs/ads117x.h b/sound/soc/codecs/ads117x.h
new file mode 100644
index 000000000000..dbcf50ec9bd1
--- /dev/null
+++ b/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;