mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 17:24:17 +08:00
603597c937
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>
77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
/*
|
|
* 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");
|