LXR linux/drivers/mfd/madera-spi.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * SPI bus interface to Cirrus Logic Madera codecs
   4 *
   5 * Copyright (C) 2015-2018 Cirrus Logic
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by the
   9 * Free Software Foundation; version 2.
  10 */
  11
  12#include <linux/device.h>
  13#include <linux/err.h>
  14#include <linux/module.h>
  15#include <linux/of.h>
  16#include <linux/of_device.h>
  17#include <linux/regmap.h>
  18#include <linux/spi/spi.h>
  19
  20#include <linux/mfd/madera/core.h>
  21
  22#include "madera.h"
  23
  24static int madera_spi_probe(struct spi_device *spi)
  25{
  26        const struct spi_device_id *id = spi_get_device_id(spi);
  27        struct madera *madera;
  28        const struct regmap_config *regmap_16bit_config = NULL;
  29        const struct regmap_config *regmap_32bit_config = NULL;
  30        const void *of_data;
  31        unsigned long type;
  32        const char *name;
  33        int ret;
  34
  35        of_data = of_device_get_match_data(&spi->dev);
  36        if (of_data)
  37                type = (unsigned long)of_data;
  38        else
  39                type = id->driver_data;
  40
  41        switch (type) {
  42        case CS47L35:
  43                if (IS_ENABLED(CONFIG_MFD_CS47L35)) {
  44                        regmap_16bit_config = &cs47l35_16bit_spi_regmap;
  45                        regmap_32bit_config = &cs47l35_32bit_spi_regmap;
  46                }
  47                break;
  48        case CS47L85:
  49        case WM1840:
  50                if (IS_ENABLED(CONFIG_MFD_CS47L85)) {
  51                        regmap_16bit_config = &cs47l85_16bit_spi_regmap;
  52                        regmap_32bit_config = &cs47l85_32bit_spi_regmap;
  53                }
  54                break;
  55        case CS47L90:
  56        case CS47L91:
  57                if (IS_ENABLED(CONFIG_MFD_CS47L90)) {
  58                        regmap_16bit_config = &cs47l90_16bit_spi_regmap;
  59                        regmap_32bit_config = &cs47l90_32bit_spi_regmap;
  60                }
  61                break;
  62        default:
  63                dev_err(&spi->dev,
  64                        "Unknown Madera SPI device type %ld\n", type);
  65                return -EINVAL;
  66        }
  67
  68        name = madera_name_from_type(type);
  69
  70        if (!regmap_16bit_config) {
  71                /* it's polite to say which codec isn't built into the kernel */
  72                dev_err(&spi->dev,
  73                        "Kernel does not include support for %s\n", name);
  74                return -EINVAL;
  75        }
  76
  77        madera = devm_kzalloc(&spi->dev, sizeof(*madera), GFP_KERNEL);
  78        if (!madera)
  79                return -ENOMEM;
  80
  81        madera->regmap = devm_regmap_init_spi(spi, regmap_16bit_config);
  82        if (IS_ERR(madera->regmap)) {
  83                ret = PTR_ERR(madera->regmap);
  84                dev_err(&spi->dev,
  85                        "Failed to allocate 16-bit register map: %d\n", ret);
  86                return ret;
  87        }
  88
  89        madera->regmap_32bit = devm_regmap_init_spi(spi, regmap_32bit_config);
  90        if (IS_ERR(madera->regmap_32bit)) {
  91                ret = PTR_ERR(madera->regmap_32bit);
  92                dev_err(&spi->dev,
  93                        "Failed to allocate 32-bit register map: %d\n", ret);
  94                return ret;
  95        }
  96
  97        madera->type = type;
  98        madera->type_name = name;
  99        madera->dev = &spi->dev;
 100        madera->irq = spi->irq;
 101
 102        return madera_dev_init(madera);
 103}
 104
 105static int madera_spi_remove(struct spi_device *spi)
 106{
 107        struct madera *madera = spi_get_drvdata(spi);
 108
 109        madera_dev_exit(madera);
 110
 111        return 0;
 112}
 113
 114static const struct spi_device_id madera_spi_ids[] = {
 115        { "cs47l35", CS47L35 },
 116        { "cs47l85", CS47L85 },
 117        { "cs47l90", CS47L90 },
 118        { "cs47l91", CS47L91 },
 119        { "wm1840", WM1840 },
 120        { }
 121};
 122MODULE_DEVICE_TABLE(spi, madera_spi_ids);
 123
 124static struct spi_driver madera_spi_driver = {
 125        .driver = {
 126                .name   = "madera",
 127                .pm     = &madera_pm_ops,
 128                .of_match_table = of_match_ptr(madera_of_match),
 129        },
 130        .probe          = madera_spi_probe,
 131        .remove         = madera_spi_remove,
 132        .id_table       = madera_spi_ids,
 133};
 134
 135module_spi_driver(madera_spi_driver);
 136
 137MODULE_DESCRIPTION("Madera SPI bus interface");
 138MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
 139MODULE_LICENSE("GPL v2");
 140