LXR linux/sound/soc/codecs/adau1372-spi.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Driver for ADAU1372 codec
   4 *
   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 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 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