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
  24 static 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
 105 static 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
 114 static 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 };
 122 MODULE_DEVICE_TABLE(spi, madera_spi_ids);
 123
 124 static 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
 135 module_spi_driver(madera_spi_driver);
 136
 137 MODULE_DESCRIPTION("Madera SPI bus interface");
 138 MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
 139 MODULE_LICENSE("GPL v2");