drivers/mfd/madera-spi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * SPI bus interface to Cirrus Logic Madera codecs
   4  *
   5  * Copyright (C) 2015-2018 Cirrus Logic
   6  */
   7
   8 #include <linux/device.h>
   9 #include <linux/err.h>
  10 #include <linux/module.h>
  11 #include <linux/of.h>
  12 #include <linux/regmap.h>
  13 #include <linux/spi/spi.h>
  14
  15 #include <linux/mfd/madera/core.h>
  16
  17 #include "madera.h"
  18
  19 static int madera_spi_probe(struct spi_device *spi)
  20 {
  21         const struct spi_device_id *id = spi_get_device_id(spi);
  22         struct madera *madera;
  23         const struct regmap_config *regmap_16bit_config = NULL;
  24         const struct regmap_config *regmap_32bit_config = NULL;
  25         const void *of_data;
  26         unsigned long type;
  27         const char *name;
  28         int ret;
  29
  30         of_data = of_device_get_match_data(&spi->dev);
  31         if (of_data)
  32                 type = (unsigned long)of_data;
  33         else
  34                 type = id->driver_data;
  35
  36         switch (type) {
  37         case CS47L15:
  38                 if (IS_ENABLED(CONFIG_MFD_CS47L15)) {
  39                         regmap_16bit_config = &cs47l15_16bit_spi_regmap;
  40                         regmap_32bit_config = &cs47l15_32bit_spi_regmap;
  41                 }
  42                 break;
  43         case CS47L35:
  44                 if (IS_ENABLED(CONFIG_MFD_CS47L35)) {
  45                         regmap_16bit_config = &cs47l35_16bit_spi_regmap;
  46                         regmap_32bit_config = &cs47l35_32bit_spi_regmap;
  47                 }
  48                 break;
  49         case CS47L85:
  50         case WM1840:
  51                 if (IS_ENABLED(CONFIG_MFD_CS47L85)) {
  52                         regmap_16bit_config = &cs47l85_16bit_spi_regmap;
  53                         regmap_32bit_config = &cs47l85_32bit_spi_regmap;
  54                 }
  55                 break;
  56         case CS47L90:
  57         case CS47L91:
  58                 if (IS_ENABLED(CONFIG_MFD_CS47L90)) {
  59                         regmap_16bit_config = &cs47l90_16bit_spi_regmap;
  60                         regmap_32bit_config = &cs47l90_32bit_spi_regmap;
  61                 }
  62                 break;
  63         case CS42L92:
  64         case CS47L92:
  65         case CS47L93:
  66                 if (IS_ENABLED(CONFIG_MFD_CS47L92)) {
  67                         regmap_16bit_config = &cs47l92_16bit_spi_regmap;
  68                         regmap_32bit_config = &cs47l92_32bit_spi_regmap;
  69                 }
  70                 break;
  71         default:
  72                 dev_err(&spi->dev,
  73                         "Unknown Madera SPI device type %ld\n", type);
  74                 return -EINVAL;
  75         }
  76
  77         name = madera_name_from_type(type);
  78
  79         if (!regmap_16bit_config) {
  80                 /* it's polite to say which codec isn't built into the kernel */
  81                 dev_err(&spi->dev,
  82                         "Kernel does not include support for %s\n", name);
  83                 return -EINVAL;
  84         }
  85
  86         madera = devm_kzalloc(&spi->dev, sizeof(*madera), GFP_KERNEL);
  87         if (!madera)
  88                 return -ENOMEM;
  89
  90         madera->regmap = devm_regmap_init_spi(spi, regmap_16bit_config);
  91         if (IS_ERR(madera->regmap)) {
  92                 ret = PTR_ERR(madera->regmap);
  93                 dev_err(&spi->dev,
  94                         "Failed to allocate 16-bit register map: %d\n", ret);
  95                 return ret;
  96         }
  97
  98         madera->regmap_32bit = devm_regmap_init_spi(spi, regmap_32bit_config);
  99         if (IS_ERR(madera->regmap_32bit)) {
 100                 ret = PTR_ERR(madera->regmap_32bit);
 101                 dev_err(&spi->dev,
 102                         "Failed to allocate 32-bit register map: %d\n", ret);
 103                 return ret;
 104         }
 105
 106         madera->type = type;
 107         madera->type_name = name;
 108         madera->dev = &spi->dev;
 109         madera->irq = spi->irq;
 110
 111         return madera_dev_init(madera);
 112 }
 113
 114 static void madera_spi_remove(struct spi_device *spi)
 115 {
 116         struct madera *madera = spi_get_drvdata(spi);
 117
 118         madera_dev_exit(madera);
 119 }
 120
 121 static const struct spi_device_id madera_spi_ids[] = {
 122         { "cs47l15", CS47L15 },
 123         { "cs47l35", CS47L35 },
 124         { "cs47l85", CS47L85 },
 125         { "cs47l90", CS47L90 },
 126         { "cs47l91", CS47L91 },
 127         { "cs42l92", CS42L92 },
 128         { "cs47l92", CS47L92 },
 129         { "cs47l93", CS47L93 },
 130         { "wm1840", WM1840 },
 131         { }
 132 };
 133 MODULE_DEVICE_TABLE(spi, madera_spi_ids);
 134
 135 static struct spi_driver madera_spi_driver = {
 136         .driver = {
 137                 .name   = "madera",
 138                 .pm     = &madera_pm_ops,
 139                 .of_match_table = of_match_ptr(madera_of_match),
 140         },
 141         .probe          = madera_spi_probe,
 142         .remove         = madera_spi_remove,
 143         .id_table       = madera_spi_ids,
 144 };
 145
 146 module_spi_driver(madera_spi_driver);
 147
 148 MODULE_DESCRIPTION("Madera SPI bus interface");
 149 MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
 150 MODULE_LICENSE("GPL v2");