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

   1/*
   2 * Driver for ADAU1381/ADAU1781 CODEC
   3 *
   4 * Copyright 2014 Analog Devices Inc.
   5 *  Author: Lars-Peter Clausen <lars@metafoo.de>
   6 *
   7 * Licensed under the GPL-2.
   8 */
   9
  10#include <linux/mod_devicetable.h>
  11#include <linux/module.h>
  12#include <linux/regmap.h>
  13#include <linux/spi/spi.h>
  14#include <sound/soc.h>
  15
  16#include "adau1781.h"
  17
  18static void adau1781_spi_switch_mode(struct device *dev)
  19{
  20        struct spi_device *spi = to_spi_device(dev);
  21
  22        /*
  23         * To get the device into SPI mode CLATCH has to be pulled low three
  24         * times.  Do this by issuing three dummy reads.
  25         */
  26        spi_w8r8(spi, 0x00);
  27        spi_w8r8(spi, 0x00);
  28        spi_w8r8(spi, 0x00);
  29}
  30
  31static int adau1781_spi_probe(struct spi_device *spi)
  32{
  33        const struct spi_device_id *id = spi_get_device_id(spi);
  34        struct regmap_config config;
  35
  36        if (!id)
  37                return -EINVAL;
  38
  39        config = adau1781_regmap_config;
  40        config.val_bits = 8;
  41        config.reg_bits = 24;
  42        config.read_flag_mask = 0x1;
  43
  44        return adau1781_probe(&spi->dev,
  45                devm_regmap_init_spi(spi, &config),
  46                id->driver_data, adau1781_spi_switch_mode);
  47}
  48
  49static int adau1781_spi_remove(struct spi_device *spi)
  50{
  51        adau17x1_remove(&spi->dev);
  52        return 0;
  53}
  54
  55static const struct spi_device_id adau1781_spi_id[] = {
  56        { "adau1381", ADAU1381 },
  57        { "adau1781", ADAU1781 },
  58        { }
  59};
  60MODULE_DEVICE_TABLE(spi, adau1781_spi_id);
  61
  62#if defined(CONFIG_OF)
  63static const struct of_device_id adau1781_spi_dt_ids[] = {
  64        { .compatible = "adi,adau1381", },
  65        { .compatible = "adi,adau1781", },
  66        { },
  67};
  68MODULE_DEVICE_TABLE(of, adau1781_spi_dt_ids);
  69#endif
  70
  71static struct spi_driver adau1781_spi_driver = {
  72        .driver = {
  73                .name = "adau1781",
  74                .of_match_table = of_match_ptr(adau1781_spi_dt_ids),
  75        },
  76        .probe = adau1781_spi_probe,
  77        .remove = adau1781_spi_remove,
  78        .id_table = adau1781_spi_id,
  79};
  80module_spi_driver(adau1781_spi_driver);
  81
  82MODULE_DESCRIPTION("ASoC ADAU1381/ADAU1781 CODEC SPI driver");
  83MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
  84MODULE_LICENSE("GPL");
  85