LXR linux/sound/soc/codecs/adau1761-spi.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Driver for ADAU1361/ADAU1461/ADAU1761/ADAU1961 codec
   4 *
   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/spi/spi.h>
  13#include <sound/soc.h>
  14
  15#include "adau1761.h"
  16
  17static void adau1761_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 three
  23         * 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 adau1761_spi_probe(struct spi_device *spi)
  31{
  32        const struct spi_device_id *id = spi_get_device_id(spi);
  33        struct regmap_config config;
  34
  35        if (!id)
  36                return -EINVAL;
  37
  38        config = adau1761_regmap_config;
  39        config.val_bits = 8;
  40        config.reg_bits = 24;
  41        config.read_flag_mask = 0x1;
  42
  43        return adau1761_probe(&spi->dev,
  44                devm_regmap_init_spi(spi, &config),
  45                id->driver_data, adau1761_spi_switch_mode);
  46}
  47
  48static int adau1761_spi_remove(struct spi_device *spi)
  49{
  50        adau17x1_remove(&spi->dev);
  51        return 0;
  52}
  53
  54static const struct spi_device_id adau1761_spi_id[] = {
  55        { "adau1361", ADAU1361 },
  56        { "adau1461", ADAU1761 },
  57        { "adau1761", ADAU1761 },
  58        { "adau1961", ADAU1361 },
  59        { }
  60};
  61MODULE_DEVICE_TABLE(spi, adau1761_spi_id);
  62
  63#if defined(CONFIG_OF)
  64static const struct of_device_id adau1761_spi_dt_ids[] = {
  65        { .compatible = "adi,adau1361", },
  66        { .compatible = "adi,adau1461", },
  67        { .compatible = "adi,adau1761", },
  68        { .compatible = "adi,adau1961", },
  69        { },
  70};
  71MODULE_DEVICE_TABLE(of, adau1761_spi_dt_ids);
  72#endif
  73
  74static struct spi_driver adau1761_spi_driver = {
  75        .driver = {
  76                .name = "adau1761",
  77                .of_match_table = of_match_ptr(adau1761_spi_dt_ids),
  78        },
  79        .probe = adau1761_spi_probe,
  80        .remove = adau1761_spi_remove,
  81        .id_table = adau1761_spi_id,
  82};
  83module_spi_driver(adau1761_spi_driver);
  84
  85MODULE_DESCRIPTION("ASoC ADAU1361/ADAU1461/ADAU1761/ADAU1961 CODEC SPI driver");
  86MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
  87MODULE_LICENSE("GPL");
  88