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/regmap.h>
  14
  15 #include <linux/mfd/madera/core.h>
  16
  17 #include "madera.h"
  18
  19 static int madera_i2c_probe(struct i2c_client *i2c)
  20 {
  21         struct madera *madera;
  22         const struct regmap_config *regmap_16bit_config = NULL;
  23         const struct regmap_config *regmap_32bit_config = NULL;
  24         unsigned long type;
  25         const char *name;
  26         int ret;
  27
  28         type = (uintptr_t)i2c_get_match_data(i2c);
  29         switch (type) {
  30         case CS47L15:
  31                 if (IS_ENABLED(CONFIG_MFD_CS47L15)) {
  32                         regmap_16bit_config = &cs47l15_16bit_i2c_regmap;
  33                         regmap_32bit_config = &cs47l15_32bit_i2c_regmap;
  34                 }
  35                 break;
  36         case CS47L35:
  37                 if (IS_ENABLED(CONFIG_MFD_CS47L35)) {
  38                         regmap_16bit_config = &cs47l35_16bit_i2c_regmap;
  39                         regmap_32bit_config = &cs47l35_32bit_i2c_regmap;
  40                 }
  41                 break;
  42         case CS47L85:
  43         case WM1840:
  44                 if (IS_ENABLED(CONFIG_MFD_CS47L85)) {
  45                         regmap_16bit_config = &cs47l85_16bit_i2c_regmap;
  46                         regmap_32bit_config = &cs47l85_32bit_i2c_regmap;
  47                 }
  48                 break;
  49         case CS47L90:
  50         case CS47L91:
  51                 if (IS_ENABLED(CONFIG_MFD_CS47L90)) {
  52                         regmap_16bit_config = &cs47l90_16bit_i2c_regmap;
  53                         regmap_32bit_config = &cs47l90_32bit_i2c_regmap;
  54                 }
  55                 break;
  56         case CS42L92:
  57         case CS47L92:
  58         case CS47L93:
  59                 if (IS_ENABLED(CONFIG_MFD_CS47L92)) {
  60                         regmap_16bit_config = &cs47l92_16bit_i2c_regmap;
  61                         regmap_32bit_config = &cs47l92_32bit_i2c_regmap;
  62                 }
  63                 break;
  64         default:
  65                 dev_err(&i2c->dev,
  66                         "Unknown Madera I2C device type %ld\n", type);
  67                 return -EINVAL;
  68         }
  69
  70         name = madera_name_from_type(type);
  71
  72         if (!regmap_16bit_config) {
  73                 /* it's polite to say which codec isn't built into the kernel */
  74                 dev_err(&i2c->dev,
  75                         "Kernel does not include support for %s\n", name);
  76                 return -EINVAL;
  77         }
  78
  79         madera = devm_kzalloc(&i2c->dev, sizeof(*madera), GFP_KERNEL);
  80         if (!madera)
  81                 return -ENOMEM;
  82
  83         madera->regmap = devm_regmap_init_i2c(i2c, regmap_16bit_config);
  84         if (IS_ERR(madera->regmap)) {
  85                 ret = PTR_ERR(madera->regmap);
  86                 dev_err(&i2c->dev,
  87                         "Failed to allocate 16-bit register map: %d\n", ret);
  88                 return ret;
  89         }
  90
  91         madera->regmap_32bit = devm_regmap_init_i2c(i2c, regmap_32bit_config);
  92         if (IS_ERR(madera->regmap_32bit)) {
  93                 ret = PTR_ERR(madera->regmap_32bit);
  94                 dev_err(&i2c->dev,
  95                         "Failed to allocate 32-bit register map: %d\n", ret);
  96                 return ret;
  97         }
  98
  99         madera->type = type;
 100         madera->type_name = name;
 101         madera->dev = &i2c->dev;
 102         madera->irq = i2c->irq;
 103
 104         return madera_dev_init(madera);
 105 }
 106
 107 static void madera_i2c_remove(struct i2c_client *i2c)
 108 {
 109         struct madera *madera = dev_get_drvdata(&i2c->dev);
 110
 111         madera_dev_exit(madera);
 112 }
 113
 114 static const struct i2c_device_id madera_i2c_id[] = {
 115         { "cs47l15", CS47L15 },
 116         { "cs47l35", CS47L35 },
 117         { "cs47l85", CS47L85 },
 118         { "cs47l90", CS47L90 },
 119         { "cs47l91", CS47L91 },
 120         { "cs42l92", CS42L92 },
 121         { "cs47l92", CS47L92 },
 122         { "cs47l93", CS47L93 },
 123         { "wm1840", WM1840 },
 124         { }
 125 };
 126 MODULE_DEVICE_TABLE(i2c, madera_i2c_id);
 127
 128 static struct i2c_driver madera_i2c_driver = {
 129         .driver = {
 130                 .name   = "madera",
 131                 .pm     = &madera_pm_ops,
 132                 .of_match_table = of_match_ptr(madera_of_match),
 133         },
 134         .probe          = madera_i2c_probe,
 135         .remove         = madera_i2c_remove,
 136         .id_table       = madera_i2c_id,
 137 };
 138
 139 module_i2c_driver(madera_i2c_driver);
 140
 141 MODULE_DESCRIPTION("Madera I2C bus interface");
 142 MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
 143 MODULE_LICENSE("GPL v2");