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ASoC: Add ADAU1977 CODEC driver

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This patch adds support for the ADAU1977, ADAU1978 and ADAU1979 audio CODEC
devices. They are a family of 4-channel differential input audio ADC devices.
They can be connected to either a SPI or I2C bus. The driver is implemented in
three modules, one main module (adau1977.ko) which implements the device logic
and one module each for SPI (adau1977-spi.ko) and I2C (adau1977-i2c.ko) bus
access.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Lars-Peter Clausen
2014-02-18 15:57:35 +01:00
committed by Mark Brown
parent a32eb702f8
commit 603597c937
7 changed files with 1256 additions and 0 deletions
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76
sound/soc/codecs/adau1977-spi.c Normal file
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/*
* ADAU1977/ADAU1978/ADAU1979 driver
*
* 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 "adau1977.h"
static void adau1977_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 adau1977_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 = adau1977_regmap_config;
config.val_bits = 8;
config.reg_bits = 16;
config.read_flag_mask = 0x1;
return adau1977_probe(&spi->dev,
devm_regmap_init_spi(spi, &config),
id->driver_data, adau1977_spi_switch_mode);
}
static int adau1977_spi_remove(struct spi_device *spi)
{
snd_soc_unregister_codec(&spi->dev);
return 0;
}
static const struct spi_device_id adau1977_spi_ids[] = {
{ "adau1977", ADAU1977 },
{ "adau1978", ADAU1978 },
{ "adau1979", ADAU1978 },
{ }
};
MODULE_DEVICE_TABLE(spi, adau1977_spi_ids);
static struct spi_driver adau1977_spi_driver = {
.driver = {
.name = "adau1977",
.owner = THIS_MODULE,
},
.probe = adau1977_spi_probe,
.remove = adau1977_spi_remove,
.id_table = adau1977_spi_ids,
};
module_spi_driver(adau1977_spi_driver);
MODULE_DESCRIPTION("ASoC ADAU1977/ADAU1978/ADAU1979 driver");
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_LICENSE("GPL");