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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
/*
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* ADAU1977/ADAU1978/ADAU1979 driver
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*
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* Copyright 2014 Analog Devices Inc.
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* Author: Lars-Peter Clausen <lars@metafoo.de>
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/spi/spi.h>
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#include <sound/soc.h>
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#include "adau1977.h"
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static void adau1977_spi_switch_mode(struct device *dev)
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{
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struct spi_device *spi = to_spi_device(dev);
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/*
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* To get the device into SPI mode CLATCH has to be pulled low three
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* times. Do this by issuing three dummy reads.
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*/
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spi_w8r8(spi, 0x00);
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spi_w8r8(spi, 0x00);
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spi_w8r8(spi, 0x00);
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}
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static int adau1977_spi_probe(struct spi_device *spi)
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{
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const struct spi_device_id *id = spi_get_device_id(spi);
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struct regmap_config config;
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if (!id)
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return -EINVAL;
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config = adau1977_regmap_config;
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config.val_bits = 8;
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config.reg_bits = 16;
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config.read_flag_mask = 0x1;
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return adau1977_probe(&spi->dev,
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devm_regmap_init_spi(spi, &config),
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id->driver_data, adau1977_spi_switch_mode);
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}
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static int adau1977_spi_remove(struct spi_device *spi)
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{
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snd_soc_unregister_codec(&spi->dev);
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return 0;
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}
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static const struct spi_device_id adau1977_spi_ids[] = {
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{ "adau1977", ADAU1977 },
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{ "adau1978", ADAU1978 },
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{ "adau1979", ADAU1978 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, adau1977_spi_ids);
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static struct spi_driver adau1977_spi_driver = {
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.driver = {
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.name = "adau1977",
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.owner = THIS_MODULE,
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},
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.probe = adau1977_spi_probe,
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.remove = adau1977_spi_remove,
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.id_table = adau1977_spi_ids,
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};
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module_spi_driver(adau1977_spi_driver);
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MODULE_DESCRIPTION("ASoC ADAU1977/ADAU1978/ADAU1979 driver");
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MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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MODULE_LICENSE("GPL");
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