soc/codecs/adau1781-spi.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Driver for ADAU1381/ADAU1781 CODEC
0004  *
0005  * Copyright 2014 Analog Devices Inc.
0006  *  Author: Lars-Peter Clausen <lars@metafoo.de>
0007  */
0008
0009 #include <linux/mod_devicetable.h>
0010 #include <linux/module.h>
0011 #include <linux/regmap.h>
0012 #include <linux/spi/spi.h>
0013 #include <sound/soc.h>
0014
0015 #include "adau1781.h"
0016
0017 static void adau1781_spi_switch_mode(struct device *dev)
0018 {
0019     struct spi_device *spi = to_spi_device(dev);
0020
0021     /*
0022      * To get the device into SPI mode CLATCH has to be pulled low three
0023      * times.  Do this by issuing three dummy reads.
0024      */
0025     spi_w8r8(spi, 0x00);
0026     spi_w8r8(spi, 0x00);
0027     spi_w8r8(spi, 0x00);
0028 }
0029
0030 static int adau1781_spi_probe(struct spi_device *spi)
0031 {
0032     const struct spi_device_id *id = spi_get_device_id(spi);
0033     struct regmap_config config;
0034
0035     if (!id)
0036         return -EINVAL;
0037
0038     config = adau1781_regmap_config;
0039     config.val_bits = 8;
0040     config.reg_bits = 24;
0041     config.read_flag_mask = 0x1;
0042
0043     return adau1781_probe(&spi->dev,
0044         devm_regmap_init_spi(spi, &config),
0045         id->driver_data, adau1781_spi_switch_mode);
0046 }
0047
0048 static void adau1781_spi_remove(struct spi_device *spi)
0049 {
0050     adau17x1_remove(&spi->dev);
0051 }
0052
0053 static const struct spi_device_id adau1781_spi_id[] = {
0054     { "adau1381", ADAU1381 },
0055     { "adau1781", ADAU1781 },
0056     { }
0057 };
0058 MODULE_DEVICE_TABLE(spi, adau1781_spi_id);
0059
0060 #if defined(CONFIG_OF)
0061 static const struct of_device_id adau1781_spi_dt_ids[] = {
0062     { .compatible = "adi,adau1381", },
0063     { .compatible = "adi,adau1781", },
0064     { },
0065 };
0066 MODULE_DEVICE_TABLE(of, adau1781_spi_dt_ids);
0067 #endif
0068
0069 static struct spi_driver adau1781_spi_driver = {
0070     .driver = {
0071         .name = "adau1781",
0072         .of_match_table = of_match_ptr(adau1781_spi_dt_ids),
0073     },
0074     .probe = adau1781_spi_probe,
0075     .remove = adau1781_spi_remove,
0076     .id_table = adau1781_spi_id,
0077 };
0078 module_spi_driver(adau1781_spi_driver);
0079
0080 MODULE_DESCRIPTION("ASoC ADAU1381/ADAU1781 CODEC SPI driver");
0081 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
0082 MODULE_LICENSE("GPL");