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