LXR linux/sound/soc/codecs/adau1781-spi.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Driver for ADAU1381/ADAU1781 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 "adau1781.h"
  16
  17static void adau1781_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 adau1781_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 = adau1781_regmap_config;
  39        config.val_bits = 8;
  40        config.reg_bits = 24;
  41        config.read_flag_mask = 0x1;
  42
  43        return adau1781_probe(&spi->dev,
  44                devm_regmap_init_spi(spi, &config),
  45                id->driver_data, adau1781_spi_switch_mode);
  46}
  47
  48static int adau1781_spi_remove(struct spi_device *spi)
  49{
  50        adau17x1_remove(&spi->dev);
  51        return 0;
  52}
  53
  54static const struct spi_device_id adau1781_spi_id[] = {
  55        { "adau1381", ADAU1381 },
  56        { "adau1781", ADAU1781 },
  57        { }
  58};
  59MODULE_DEVICE_TABLE(spi, adau1781_spi_id);
  60
  61#if defined(CONFIG_OF)
  62static const struct of_device_id adau1781_spi_dt_ids[] = {
  63        { .compatible = "adi,adau1381", },
  64        { .compatible = "adi,adau1781", },
  65        { },
  66};
  67MODULE_DEVICE_TABLE(of, adau1781_spi_dt_ids);
  68#endif
  69
  70static struct spi_driver adau1781_spi_driver = {
  71        .driver = {
  72                .name = "adau1781",
  73                .of_match_table = of_match_ptr(adau1781_spi_dt_ids),
  74        },
  75        .probe = adau1781_spi_probe,
  76        .remove = adau1781_spi_remove,
  77        .id_table = adau1781_spi_id,
  78};
  79module_spi_driver(adau1781_spi_driver);
  80
  81MODULE_DESCRIPTION("ASoC ADAU1381/ADAU1781 CODEC SPI driver");
  82MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
  83MODULE_LICENSE("GPL");
  84