drivers/mfd/madera-i2c.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * I2C 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/i2c.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/of_device.h>
  14 #include <linux/regmap.h>
  15
  16 #include <linux/mfd/madera/core.h>
  17
  18 #include "madera.h"
  19
  20 static int madera_i2c_probe(struct i2c_client *i2c,
  21                             const struct i2c_device_id *id)
  22 {
  23         struct madera *madera;
  24         const struct regmap_config *regmap_16bit_config = NULL;
  25         const struct regmap_config *regmap_32bit_config = NULL;
  26         const void *of_data;
  27         unsigned long type;
  28         const char *name;
  29         int ret;
  30
  31         of_data = of_device_get_match_data(&i2c->dev);
  32         if (of_data)
  33                 type = (unsigned long)of_data;
  34         else
  35                 type = id->driver_data;
  36
  37         switch (type) {
  38         case CS47L15:
  39                 if (IS_ENABLED(CONFIG_MFD_CS47L15)) {
  40                         regmap_16bit_config = &cs47l15_16bit_i2c_regmap;
  41                         regmap_32bit_config = &cs47l15_32bit_i2c_regmap;
  42                 }
  43                 break;
  44         case CS47L35:
  45                 if (IS_ENABLED(CONFIG_MFD_CS47L35)) {
  46                         regmap_16bit_config = &cs47l35_16bit_i2c_regmap;
  47                         regmap_32bit_config = &cs47l35_32bit_i2c_regmap;
  48                 }
  49                 break;
  50         case CS47L85:
  51         case WM1840:
  52                 if (IS_ENABLED(CONFIG_MFD_CS47L85)) {
  53                         regmap_16bit_config = &cs47l85_16bit_i2c_regmap;
  54                         regmap_32bit_config = &cs47l85_32bit_i2c_regmap;
  55                 }
  56                 break;
  57         case CS47L90:
  58         case CS47L91:
  59                 if (IS_ENABLED(CONFIG_MFD_CS47L90)) {
  60                         regmap_16bit_config = &cs47l90_16bit_i2c_regmap;
  61                         regmap_32bit_config = &cs47l90_32bit_i2c_regmap;
  62                 }
  63                 break;
  64         case CS42L92:
  65         case CS47L92:
  66         case CS47L93:
  67                 if (IS_ENABLED(CONFIG_MFD_CS47L92)) {
  68                         regmap_16bit_config = &cs47l92_16bit_i2c_regmap;
  69                         regmap_32bit_config = &cs47l92_32bit_i2c_regmap;
  70                 }
  71                 break;
  72         default:
  73                 dev_err(&i2c->dev,
  74                         "Unknown Madera I2C device type %ld\n", type);
  75                 return -EINVAL;
  76         }
  77
  78         name = madera_name_from_type(type);
  79
  80         if (!regmap_16bit_config) {
  81                 /* it's polite to say which codec isn't built into the kernel */
  82                 dev_err(&i2c->dev,
  83                         "Kernel does not include support for %s\n", name);
  84                 return -EINVAL;
  85         }
  86
  87         madera = devm_kzalloc(&i2c->dev, sizeof(*madera), GFP_KERNEL);
  88         if (!madera)
  89                 return -ENOMEM;
  90
  91         madera->regmap = devm_regmap_init_i2c(i2c, regmap_16bit_config);
  92         if (IS_ERR(madera->regmap)) {
  93                 ret = PTR_ERR(madera->regmap);
  94                 dev_err(&i2c->dev,
  95                         "Failed to allocate 16-bit register map: %d\n", ret);
  96                 return ret;
  97         }
  98
  99         madera->regmap_32bit = devm_regmap_init_i2c(i2c, regmap_32bit_config);
 100         if (IS_ERR(madera->regmap_32bit)) {
 101                 ret = PTR_ERR(madera->regmap_32bit);
 102                 dev_err(&i2c->dev,
 103                         "Failed to allocate 32-bit register map: %d\n", ret);
 104                 return ret;
 105         }
 106
 107         madera->type = type;
 108         madera->type_name = name;
 109         madera->dev = &i2c->dev;
 110         madera->irq = i2c->irq;
 111
 112         return madera_dev_init(madera);
 113 }
 114
 115 static int madera_i2c_remove(struct i2c_client *i2c)
 116 {
 117         struct madera *madera = dev_get_drvdata(&i2c->dev);
 118
 119         madera_dev_exit(madera);
 120
 121         return 0;
 122 }
 123
 124 static const struct i2c_device_id madera_i2c_id[] = {
 125         { "cs47l15", CS47L15 },
 126         { "cs47l35", CS47L35 },
 127         { "cs47l85", CS47L85 },
 128         { "cs47l90", CS47L90 },
 129         { "cs47l91", CS47L91 },
 130         { "cs42l92", CS42L92 },
 131         { "cs47l92", CS47L92 },
 132         { "cs47l93", CS47L93 },
 133         { "wm1840", WM1840 },
 134         { }
 135 };
 136 MODULE_DEVICE_TABLE(i2c, madera_i2c_id);
 137
 138 static struct i2c_driver madera_i2c_driver = {
 139         .driver = {
 140                 .name   = "madera",
 141                 .pm     = &madera_pm_ops,
 142                 .of_match_table = of_match_ptr(madera_of_match),
 143         },
 144         .probe          = madera_i2c_probe,
 145         .remove         = madera_i2c_remove,
 146         .id_table       = madera_i2c_id,
 147 };
 148
 149 module_i2c_driver(madera_i2c_driver);
 150
 151 MODULE_DESCRIPTION("Madera I2C bus interface");
 152 MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
 153 MODULE_LICENSE("GPL v2");