linux/drivers/mfd/arizona-i2c.c
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   1/*
   2 * Arizona-i2c.c  --  Arizona I2C bus interface
   3 *
   4 * Copyright 2012 Wolfson Microelectronics plc
   5 *
   6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12
  13#include <linux/err.h>
  14#include <linux/i2c.h>
  15#include <linux/module.h>
  16#include <linux/pm_runtime.h>
  17#include <linux/regmap.h>
  18#include <linux/regulator/consumer.h>
  19#include <linux/slab.h>
  20
  21#include <linux/mfd/arizona/core.h>
  22
  23#include "arizona.h"
  24
  25static int arizona_i2c_probe(struct i2c_client *i2c,
  26                                          const struct i2c_device_id *id)
  27{
  28        struct arizona *arizona;
  29        const struct regmap_config *regmap_config;
  30        int ret, type;
  31
  32        if (i2c->dev.of_node)
  33                type = arizona_of_get_type(&i2c->dev);
  34        else
  35                type = id->driver_data;
  36
  37        switch (type) {
  38#ifdef CONFIG_MFD_WM5102
  39        case WM5102:
  40                regmap_config = &wm5102_i2c_regmap;
  41                break;
  42#endif
  43#ifdef CONFIG_MFD_WM5110
  44        case WM5110:
  45                regmap_config = &wm5110_i2c_regmap;
  46                break;
  47#endif
  48#ifdef CONFIG_MFD_WM8997
  49        case WM8997:
  50                regmap_config = &wm8997_i2c_regmap;
  51                break;
  52#endif
  53        default:
  54                dev_err(&i2c->dev, "Unknown device type %ld\n",
  55                        id->driver_data);
  56                return -EINVAL;
  57        }
  58
  59        arizona = devm_kzalloc(&i2c->dev, sizeof(*arizona), GFP_KERNEL);
  60        if (arizona == NULL)
  61                return -ENOMEM;
  62
  63        arizona->regmap = devm_regmap_init_i2c(i2c, regmap_config);
  64        if (IS_ERR(arizona->regmap)) {
  65                ret = PTR_ERR(arizona->regmap);
  66                dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
  67                        ret);
  68                return ret;
  69        }
  70
  71        arizona->type = id->driver_data;
  72        arizona->dev = &i2c->dev;
  73        arizona->irq = i2c->irq;
  74
  75        return arizona_dev_init(arizona);
  76}
  77
  78static int arizona_i2c_remove(struct i2c_client *i2c)
  79{
  80        struct arizona *arizona = dev_get_drvdata(&i2c->dev);
  81        arizona_dev_exit(arizona);
  82        return 0;
  83}
  84
  85static const struct i2c_device_id arizona_i2c_id[] = {
  86        { "wm5102", WM5102 },
  87        { "wm5110", WM5110 },
  88        { "wm8997", WM8997 },
  89        { }
  90};
  91MODULE_DEVICE_TABLE(i2c, arizona_i2c_id);
  92
  93static struct i2c_driver arizona_i2c_driver = {
  94        .driver = {
  95                .name   = "arizona",
  96                .owner  = THIS_MODULE,
  97                .pm     = &arizona_pm_ops,
  98                .of_match_table = of_match_ptr(arizona_of_match),
  99        },
 100        .probe          = arizona_i2c_probe,
 101        .remove         = arizona_i2c_remove,
 102        .id_table       = arizona_i2c_id,
 103};
 104
 105module_i2c_driver(arizona_i2c_driver);
 106
 107MODULE_DESCRIPTION("Arizona I2C bus interface");
 108MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 109MODULE_LICENSE("GPL");
 110
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