drivers/mfd/madera-i2c.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * I2C 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/i2c.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17 #include <linux/of_device.h>
  18 #include <linux/regmap.h>
  19
  20 #include <linux/mfd/madera/core.h>
  21
  22 #include "madera.h"
  23
  24 static int madera_i2c_probe(struct i2c_client *i2c,
  25                             const struct i2c_device_id *id)
  26 {
  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(&i2c->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_i2c_regmap;
  45                         regmap_32bit_config = &cs47l35_32bit_i2c_regmap;
  46                 }
  47                 break;
  48         case CS47L85:
  49         case WM1840:
  50                 if (IS_ENABLED(CONFIG_MFD_CS47L85)) {
  51                         regmap_16bit_config = &cs47l85_16bit_i2c_regmap;
  52                         regmap_32bit_config = &cs47l85_32bit_i2c_regmap;
  53                 }
  54                 break;
  55         case CS47L90:
  56         case CS47L91:
  57                 if (IS_ENABLED(CONFIG_MFD_CS47L90)) {
  58                         regmap_16bit_config = &cs47l90_16bit_i2c_regmap;
  59                         regmap_32bit_config = &cs47l90_32bit_i2c_regmap;
  60                 }
  61                 break;
  62         default:
  63                 dev_err(&i2c->dev,
  64                         "Unknown Madera I2C 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(&i2c->dev,
  73                         "Kernel does not include support for %s\n", name);
  74                 return -EINVAL;
  75         }
  76
  77         madera = devm_kzalloc(&i2c->dev, sizeof(*madera), GFP_KERNEL);
  78         if (!madera)
  79                 return -ENOMEM;
  80
  81
  82         madera->regmap = devm_regmap_init_i2c(i2c, regmap_16bit_config);
  83         if (IS_ERR(madera->regmap)) {
  84                 ret = PTR_ERR(madera->regmap);
  85                 dev_err(&i2c->dev,
  86                         "Failed to allocate 16-bit register map: %d\n", ret);
  87                 return ret;
  88         }
  89
  90         madera->regmap_32bit = devm_regmap_init_i2c(i2c, regmap_32bit_config);
  91         if (IS_ERR(madera->regmap_32bit)) {
  92                 ret = PTR_ERR(madera->regmap_32bit);
  93                 dev_err(&i2c->dev,
  94                         "Failed to allocate 32-bit register map: %d\n", ret);
  95                 return ret;
  96         }
  97
  98         madera->type = type;
  99         madera->type_name = name;
 100         madera->dev = &i2c->dev;
 101         madera->irq = i2c->irq;
 102
 103         return madera_dev_init(madera);
 104 }
 105
 106 static int madera_i2c_remove(struct i2c_client *i2c)
 107 {
 108         struct madera *madera = dev_get_drvdata(&i2c->dev);
 109
 110         madera_dev_exit(madera);
 111
 112         return 0;
 113 }
 114
 115 static const struct i2c_device_id madera_i2c_id[] = {
 116         { "cs47l35", CS47L35 },
 117         { "cs47l85", CS47L85 },
 118         { "cs47l90", CS47L90 },
 119         { "cs47l91", CS47L91 },
 120         { "wm1840", WM1840 },
 121         { }
 122 };
 123 MODULE_DEVICE_TABLE(i2c, madera_i2c_id);
 124
 125 static struct i2c_driver madera_i2c_driver = {
 126         .driver = {
 127                 .name   = "madera",
 128                 .pm     = &madera_pm_ops,
 129                 .of_match_table = of_match_ptr(madera_of_match),
 130         },
 131         .probe          = madera_i2c_probe,
 132         .remove         = madera_i2c_remove,
 133         .id_table       = madera_i2c_id,
 134 };
 135
 136 module_i2c_driver(madera_i2c_driver);
 137
 138 MODULE_DESCRIPTION("Madera I2C bus interface");
 139 MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
 140 MODULE_LICENSE("GPL v2");