LXR linux/sound/soc/codecs/adau1977-spi.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * ADAU1977/ADAU1978/ADAU1979 driver
   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/of.h>
  13#include <linux/of_device.h>
  14#include <linux/spi/spi.h>
  15#include <sound/soc.h>
  16
  17#include "adau1977.h"
  18
  19static void adau1977_spi_switch_mode(struct device *dev)
  20{
  21        struct spi_device *spi = to_spi_device(dev);
  22
  23        /*
  24         * To get the device into SPI mode CLATCH has to be pulled low three
  25         * times.  Do this by issuing three dummy reads.
  26         */
  27        spi_w8r8(spi, 0x00);
  28        spi_w8r8(spi, 0x00);
  29        spi_w8r8(spi, 0x00);
  30}
  31
  32static int adau1977_spi_probe(struct spi_device *spi)
  33{
  34        const struct spi_device_id *id = spi_get_device_id(spi);
  35        struct regmap_config config;
  36
  37        if (!id)
  38                return -EINVAL;
  39
  40        config = adau1977_regmap_config;
  41        config.val_bits = 8;
  42        config.reg_bits = 16;
  43        config.read_flag_mask = 0x1;
  44
  45        return adau1977_probe(&spi->dev,
  46                devm_regmap_init_spi(spi, &config),
  47                id->driver_data, adau1977_spi_switch_mode);
  48}
  49
  50static const struct spi_device_id adau1977_spi_ids[] = {
  51        { "adau1977", ADAU1977 },
  52        { "adau1978", ADAU1978 },
  53        { "adau1979", ADAU1978 },
  54        { }
  55};
  56MODULE_DEVICE_TABLE(spi, adau1977_spi_ids);
  57
  58static const struct of_device_id adau1977_spi_of_match[] = {
  59        { .compatible = "adi,adau1977" },
  60        { .compatible = "adi,adau1978" },
  61        { .compatible = "adi,adau1979" },
  62        { },
  63};
  64MODULE_DEVICE_TABLE(of, adau1977_spi_of_match);
  65
  66static struct spi_driver adau1977_spi_driver = {
  67        .driver = {
  68                .name = "adau1977",
  69                .of_match_table = of_match_ptr(adau1977_spi_of_match),
  70        },
  71        .probe = adau1977_spi_probe,
  72        .id_table = adau1977_spi_ids,
  73};
  74module_spi_driver(adau1977_spi_driver);
  75
  76MODULE_DESCRIPTION("ASoC ADAU1977/ADAU1978/ADAU1979 driver");
  77MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
  78MODULE_LICENSE("GPL");
  79