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 <[email protected]>
   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
  17 static 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
  30 static 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
  48 static void adau1781_spi_remove(struct spi_device *spi)
  49 {
  50         adau17x1_remove(&spi->dev);
  51 }
  52
  53 static const struct spi_device_id adau1781_spi_id[] = {
  54         { "adau1381", ADAU1381 },
  55         { "adau1781", ADAU1781 },
  56         { }
  57 };
  58 MODULE_DEVICE_TABLE(spi, adau1781_spi_id);
  59
  60 #if defined(CONFIG_OF)
  61 static const struct of_device_id adau1781_spi_dt_ids[] = {
  62         { .compatible = "adi,adau1381", },
  63         { .compatible = "adi,adau1781", },
  64         { },
  65 };
  66 MODULE_DEVICE_TABLE(of, adau1781_spi_dt_ids);
  67 #endif
  68
  69 static struct spi_driver adau1781_spi_driver = {
  70         .driver = {
  71                 .name = "adau1781",
  72                 .of_match_table = of_match_ptr(adau1781_spi_dt_ids),
  73         },
  74         .probe = adau1781_spi_probe,
  75         .remove = adau1781_spi_remove,
  76         .id_table = adau1781_spi_id,
  77 };
  78 module_spi_driver(adau1781_spi_driver);
  79
  80 MODULE_DESCRIPTION("ASoC ADAU1381/ADAU1781 CODEC SPI driver");
  81 MODULE_AUTHOR("Lars-Peter Clausen <[email protected]>");
  82 MODULE_LICENSE("GPL");