drivers/mfd/arizona-i2c.c

   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 #include <linux/of.h>
  21
  22 #include <linux/mfd/arizona/core.h>
  23
  24 #include "arizona.h"
  25
  26 static int arizona_i2c_probe(struct i2c_client *i2c,
  27                                           const struct i2c_device_id *id)
  28 {
  29         struct arizona *arizona;
  30         const struct regmap_config *regmap_config;
  31         int ret, type;
  32
  33         if (i2c->dev.of_node)
  34                 type = arizona_of_get_type(&i2c->dev);
  35         else
  36                 type = id->driver_data;
  37
  38         switch (type) {
  39 #ifdef CONFIG_MFD_WM5102
  40         case WM5102:
  41                 regmap_config = &wm5102_i2c_regmap;
  42                 break;
  43 #endif
  44 #ifdef CONFIG_MFD_WM5110
  45         case WM5110:
  46                 regmap_config = &wm5110_i2c_regmap;
  47                 break;
  48 #endif
  49 #ifdef CONFIG_MFD_WM8997
  50         case WM8997:
  51                 regmap_config = &wm8997_i2c_regmap;
  52                 break;
  53 #endif
  54         default:
  55                 dev_err(&i2c->dev, "Unknown device type %ld\n",
  56                         id->driver_data);
  57                 return -EINVAL;
  58         }
  59
  60         arizona = devm_kzalloc(&i2c->dev, sizeof(*arizona), GFP_KERNEL);
  61         if (arizona == NULL)
  62                 return -ENOMEM;
  63
  64         arizona->regmap = devm_regmap_init_i2c(i2c, regmap_config);
  65         if (IS_ERR(arizona->regmap)) {
  66                 ret = PTR_ERR(arizona->regmap);
  67                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
  68                         ret);
  69                 return ret;
  70         }
  71
  72         arizona->type = id->driver_data;
  73         arizona->dev = &i2c->dev;
  74         arizona->irq = i2c->irq;
  75
  76         return arizona_dev_init(arizona);
  77 }
  78
  79 static int arizona_i2c_remove(struct i2c_client *i2c)
  80 {
  81         struct arizona *arizona = dev_get_drvdata(&i2c->dev);
  82         arizona_dev_exit(arizona);
  83         return 0;
  84 }
  85
  86 static const struct i2c_device_id arizona_i2c_id[] = {
  87         { "wm5102", WM5102 },
  88         { "wm5110", WM5110 },
  89         { "wm8997", WM8997 },
  90         { }
  91 };
  92 MODULE_DEVICE_TABLE(i2c, arizona_i2c_id);
  93
  94 static struct i2c_driver arizona_i2c_driver = {
  95         .driver = {
  96                 .name   = "arizona",
  97                 .owner  = THIS_MODULE,
  98                 .pm     = &arizona_pm_ops,
  99                 .of_match_table = of_match_ptr(arizona_of_match),
 100         },
 101         .probe          = arizona_i2c_probe,
 102         .remove         = arizona_i2c_remove,
 103         .id_table       = arizona_i2c_id,
 104 };
 105
 106 module_i2c_driver(arizona_i2c_driver);
 107
 108 MODULE_DESCRIPTION("Arizona I2C bus interface");
 109 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 110 MODULE_LICENSE("GPL");