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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * ADAU1977/ADAU1978/ADAU1979 driver4 *5 * Copyright 2014 Analog Devices Inc.6 *  Author: Lars-Peter Clausen <lars@metafoo.de>7 */8 9#include <linux/mod_devicetable.h>10#include <linux/module.h>11#include <linux/regmap.h>12#include <linux/of.h>13#include <linux/spi/spi.h>14#include <sound/soc.h>15 16#include "adau1977.h"17 18static void adau1977_spi_switch_mode(struct device *dev)19{20	struct spi_device *spi = to_spi_device(dev);21 22	/*23	 * To get the device into SPI mode CLATCH has to be pulled low three24	 * times.  Do this by issuing three dummy reads.25	 */26	spi_w8r8(spi, 0x00);27	spi_w8r8(spi, 0x00);28	spi_w8r8(spi, 0x00);29}30 31static int adau1977_spi_probe(struct spi_device *spi)32{33	const struct spi_device_id *id = spi_get_device_id(spi);34	struct regmap_config config;35 36	if (!id)37		return -EINVAL;38 39	config = adau1977_regmap_config;40	config.val_bits = 8;41	config.reg_bits = 16;42	config.read_flag_mask = 0x1;43 44	return adau1977_probe(&spi->dev,45		devm_regmap_init_spi(spi, &config),46		id->driver_data, adau1977_spi_switch_mode);47}48 49static const struct spi_device_id adau1977_spi_ids[] = {50	{ "adau1977", ADAU1977 },51	{ "adau1978", ADAU1978 },52	{ "adau1979", ADAU1978 },53	{ }54};55MODULE_DEVICE_TABLE(spi, adau1977_spi_ids);56 57static const struct of_device_id adau1977_spi_of_match[] __maybe_unused = {58        { .compatible = "adi,adau1977" },59        { .compatible = "adi,adau1978" },60        { .compatible = "adi,adau1979" },61        { },62};63MODULE_DEVICE_TABLE(of, adau1977_spi_of_match);64 65static struct spi_driver adau1977_spi_driver = {66	.driver = {67		.name = "adau1977",68		.of_match_table = of_match_ptr(adau1977_spi_of_match),69	},70	.probe = adau1977_spi_probe,71	.id_table = adau1977_spi_ids,72};73module_spi_driver(adau1977_spi_driver);74 75MODULE_DESCRIPTION("ASoC ADAU1977/ADAU1978/ADAU1979 driver");76MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");77MODULE_LICENSE("GPL");78