LXR linux/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
  24static 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
 106static 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
 115static 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};
 123MODULE_DEVICE_TABLE(i2c, madera_i2c_id);
 124
 125static 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
 136module_i2c_driver(madera_i2c_driver);
 137
 138MODULE_DESCRIPTION("Madera I2C bus interface");
 139MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
 140MODULE_LICENSE("GPL v2");
 141