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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/sound/soc/codecs/adau1761-spi.c
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// SPDX-License-Identifier: GPL-2.0-only

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/*

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 * Driver for ADAU1361/ADAU1461/ADAU1761/ADAU1961 codec

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 *

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 * Copyright 2014 Analog Devices Inc.

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 *  Author: Lars-Peter Clausen <[email protected]>

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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 "adau1761.h"

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static void adau1761_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 adau1761_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 = adau1761_regmap_config;

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	config.val_bits = 8;

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	config.reg_bits = 24;

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	config.read_flag_mask = 0x1;

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	return adau1761_probe(&spi->dev,

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		devm_regmap_init_spi(spi, &config),

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		id->driver_data, adau1761_spi_switch_mode);

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}

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static void adau1761_spi_remove(struct spi_device *spi)

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{

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	adau17x1_remove(&spi->dev);

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}

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static const struct spi_device_id adau1761_spi_id[] = {

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	{ "adau1361", ADAU1361 },

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	{ "adau1461", ADAU1761 },

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	{ "adau1761", ADAU1761 },

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	{ "adau1961", ADAU1361 },

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	{ }

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};

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MODULE_DEVICE_TABLE(spi, adau1761_spi_id);

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#if defined(CONFIG_OF)

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static const struct of_device_id adau1761_spi_dt_ids[] = {

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	{ .compatible = "adi,adau1361", },

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	{ .compatible = "adi,adau1461", },

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	{ .compatible = "adi,adau1761", },

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	{ .compatible = "adi,adau1961", },

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	{ },

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};

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MODULE_DEVICE_TABLE(of, adau1761_spi_dt_ids);

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#endif

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static struct spi_driver adau1761_spi_driver = {

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	.driver = {

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		.name = "adau1761",

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		.of_match_table = of_match_ptr(adau1761_spi_dt_ids),

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	},

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	.probe = adau1761_spi_probe,

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	.remove = adau1761_spi_remove,

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	.id_table = adau1761_spi_id,

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};

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module_spi_driver(adau1761_spi_driver);

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MODULE_DESCRIPTION("ASoC ADAU1361/ADAU1461/ADAU1761/ADAU1961 CODEC SPI driver");

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MODULE_AUTHOR("Lars-Peter Clausen <[email protected]>");

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MODULE_LICENSE("GPL");

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