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>

1 files changed, 127 insertions, 0 deletions

diff --git a/sound/soc/codecs/ads117x.c b/sound/soc/codecs/ads117x.c
new file mode 100644
index 00000000000..f3230927dc6
--- /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");