// SPDX-License-Identifier: GPL-2.0-only /* * ADAU1977/ADAU1978/ADAU1979 driver * * Copyright 2014 Analog Devices Inc. * Author: Lars-Peter Clausen <lars@metafoo.de> */ #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/regmap.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/spi/spi.h> #include <sound/soc.h> #include "adau1977.h" static void adau1977_spi_switch_mode(struct device *dev) { struct spi_device *spi = to_spi_device(dev); /* * To get the device into SPI mode CLATCH has to be pulled low three * times. Do this by issuing three dummy reads. */ spi_w8r8(spi, 0x00); spi_w8r8(spi, 0x00); spi_w8r8(spi, 0x00); } static int adau1977_spi_probe(struct spi_device *spi) { const struct spi_device_id *id = spi_get_device_id(spi); struct regmap_config config; if (!id) return -EINVAL; config = adau1977_regmap_config; config.val_bits = 8; config.reg_bits = 16; config.read_flag_mask = 0x1; return adau1977_probe(&spi->dev, devm_regmap_init_spi(spi, &config), id->driver_data, adau1977_spi_switch_mode); } static const struct spi_device_id adau1977_spi_ids[] = { { "adau1977", ADAU1977 }, { "adau1978", ADAU1978 }, { "adau1979", ADAU1978 }, { } }; MODULE_DEVICE_TABLE(spi, adau1977_spi_ids); static const struct of_device_id adau1977_spi_of_match[] = { { .compatible = "adi,adau1977" }, { .compatible = "adi,adau1978" }, { .compatible = "adi,adau1979" }, { }, }; MODULE_DEVICE_TABLE(of, adau1977_spi_of_match); static struct spi_driver adau1977_spi_driver = { .driver = { .name = "adau1977", .of_match_table = of_match_ptr(adau1977_spi_of_match), }, .probe = adau1977_spi_probe, .id_table = adau1977_spi_ids, }; module_spi_driver(adau1977_spi_driver); MODULE_DESCRIPTION("ASoC ADAU1977/ADAU1978/ADAU1979 driver"); MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); MODULE_LICENSE("GPL");