59 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Driver for ADAU1372 codec4 *5 * Copyright 2016 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/spi/spi.h>13#include <sound/soc.h>14 15#include "adau1372.h"16 17static void adau1372_spi_switch_mode(struct device *dev)18{19 struct spi_device *spi = to_spi_device(dev);20 21 /*22 * To get the device into SPI mode CLATCH has to be pulled low three23 * times. Do this by issuing three dummy reads.24 */25 spi_w8r8(spi, 0x00);26 spi_w8r8(spi, 0x00);27 spi_w8r8(spi, 0x00);28}29 30static int adau1372_spi_probe(struct spi_device *spi)31{32 struct regmap_config config;33 34 config = adau1372_regmap_config;35 config.read_flag_mask = 0x1;36 37 return adau1372_probe(&spi->dev,38 devm_regmap_init_spi(spi, &config), adau1372_spi_switch_mode);39}40 41static const struct spi_device_id adau1372_spi_id[] = {42 { "adau1372", 0 },43 { }44};45MODULE_DEVICE_TABLE(spi, adau1372_spi_id);46 47static struct spi_driver adau1372_spi_driver = {48 .driver = {49 .name = "adau1372",50 },51 .probe = adau1372_spi_probe,52 .id_table = adau1372_spi_id,53};54module_spi_driver(adau1372_spi_driver);55 56MODULE_DESCRIPTION("ASoC ADAU1372 CODEC SPI driver");57MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");58MODULE_LICENSE("GPL v2");59