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