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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