ASoC: Add ADAU1361/ADAU1761 audio CODEC support

This patch adds support for the Analog Devices ADAU1361 and ADAU1761 CODECs.
The device is a a low-power, 24-bit stereo audio CODEC with multiple analog
input and outputs, one digital microphone input and an I2S interface. The device
can be controlled either via I2C or SPI. The main difference between the two
variants is that the ADAU1761 has a built-in SigmaDSP, while the ADAU1361 has
not.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 77 insertions, 0 deletions

diff --git a/sound/soc/codecs/adau1761-spi.c b/sound/soc/codecs/adau1761-spi.c
new file mode 100644
index 000000000000..cce2f11f1ffb
--- /dev/null
+++ b/sound/soc/codecs/adau1761-spi.c
@@ -0,0 +1,77 @@
+/*
+ * Driver for ADAU1761/ADAU1461/ADAU1761/ADAU1961 codec
+ *
+ * Copyright 2014 Analog Devices Inc.
+ *  Author: Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+#include <sound/soc.h>
+
+#include "adau1761.h"
+
+static void adau1761_spi_switch_mode(struct device *dev)
+{
+	struct spi_device *spi = to_spi_device(dev);
+
+	/*
+	 * To get the device into SPI mode CLATCH has to be pulled low three
+	 * times.  Do this by issuing three dummy reads.
+	 */
+	spi_w8r8(spi, 0x00);
+	spi_w8r8(spi, 0x00);
+	spi_w8r8(spi, 0x00);
+}
+
+static int adau1761_spi_probe(struct spi_device *spi)
+{
+	const struct spi_device_id *id = spi_get_device_id(spi);
+	struct regmap_config config;
+
+	if (!id)
+		return -EINVAL;
+
+	config = adau1761_regmap_config;
+	config.val_bits = 8;
+	config.reg_bits = 24;
+	config.read_flag_mask = 0x1;
+
+	return adau1761_probe(&spi->dev,
+		devm_regmap_init_spi(spi, &config),
+		id->driver_data, adau1761_spi_switch_mode);
+}
+
+static int adau1761_spi_remove(struct spi_device *spi)
+{
+	snd_soc_unregister_codec(&spi->dev);
+	return 0;
+}
+
+static const struct spi_device_id adau1761_spi_id[] = {
+	{ "adau1361", ADAU1361 },
+	{ "adau1461", ADAU1761 },
+	{ "adau1761", ADAU1761 },
+	{ "adau1961", ADAU1361 },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, adau1761_spi_id);
+
+static struct spi_driver adau1761_spi_driver = {
+	.driver = {
+		.name = "adau1761",
+		.owner = THIS_MODULE,
+	},
+	.probe = adau1761_spi_probe,
+	.remove = adau1761_spi_remove,
+	.id_table = adau1761_spi_id,
+};
+module_spi_driver(adau1761_spi_driver);
+
+MODULE_DESCRIPTION("ASoC ADAU1361/ADAU1461/ADAU1761/ADAU1961 CODEC SPI driver");
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_LICENSE("GPL");