ASoC: Add ADAU1381/ADAU1781 audio CODEC support

This patch adds support for the Analog Devices ADAU1381 and ADAU1781 audio
CODECs. The device is a low-power, 24-bit stereo audio CODEC with multiple
analog inputs and outputs, two digital microphone inputs and an I2S interface.
The device can be controlled either using I2C or SPI. The main difference
between the two variants is that the ADAU1781 has a freely programmable SigmaDSP
processor, while the ADAU1381 has a fixed function wind noise reduction filter.

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

1 files changed, 75 insertions, 0 deletions

diff --git a/sound/soc/codecs/adau1781-spi.c b/sound/soc/codecs/adau1781-spi.c
new file mode 100644
index 000000000000..194686716bbe
--- /dev/null
+++ b/sound/soc/codecs/adau1781-spi.c
@@ -0,0 +1,75 @@
+/*
+ * Driver for ADAU1381/ADAU1781 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 "adau1781.h"
+
+static void adau1781_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 adau1781_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 = adau1781_regmap_config;
+	config.val_bits = 8;
+	config.reg_bits = 24;
+	config.read_flag_mask = 0x1;
+
+	return adau1781_probe(&spi->dev,
+		devm_regmap_init_spi(spi, &config),
+		id->driver_data, adau1781_spi_switch_mode);
+}
+
+static int adau1781_spi_remove(struct spi_device *spi)
+{
+	snd_soc_unregister_codec(&spi->dev);
+	return 0;
+}
+
+static const struct spi_device_id adau1781_spi_id[] = {
+	{ "adau1381", ADAU1381 },
+	{ "adau1781", ADAU1781 },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, adau1781_spi_id);
+
+static struct spi_driver adau1781_spi_driver = {
+	.driver = {
+		.name = "adau1781",
+		.owner = THIS_MODULE,
+	},
+	.probe = adau1781_spi_probe,
+	.remove = adau1781_spi_remove,
+	.id_table = adau1781_spi_id,
+};
+module_spi_driver(adau1781_spi_driver);
+
+MODULE_DESCRIPTION("ASoC ADAU1381/ADAU1781 CODEC SPI driver");
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_LICENSE("GPL");