kernel/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         case WM8280:
  48                 regmap_config = &wm5110_i2c_regmap;
  49                 break;
  50 #endif
  51 #ifdef CONFIG_MFD_WM8997
  52         case WM8997:
  53                 regmap_config = &wm8997_i2c_regmap;
  54                 break;
  55 #endif
  56         default:
  57                 dev_err(&i2c->dev, "Unknown device type %ld\n",
  58                         id->driver_data);
  59                 return -EINVAL;
  60         }
  61
  62         arizona = devm_kzalloc(&i2c->dev, sizeof(*arizona), GFP_KERNEL);
  63         if (arizona == NULL)
  64                 return -ENOMEM;
  65
  66         arizona->regmap = devm_regmap_init_i2c(i2c, regmap_config);
  67         if (IS_ERR(arizona->regmap)) {
  68                 ret = PTR_ERR(arizona->regmap);
  69                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
  70                         ret);
  71                 return ret;
  72         }
  73
  74         arizona->type = id->driver_data;
  75         arizona->dev = &i2c->dev;
  76         arizona->irq = i2c->irq;
  77
  78         return arizona_dev_init(arizona);
  79 }
  80
  81 static int arizona_i2c_remove(struct i2c_client *i2c)
  82 {
  83         struct arizona *arizona = dev_get_drvdata(&i2c->dev);
  84         arizona_dev_exit(arizona);
  85         return 0;
  86 }
  87
  88 static const struct i2c_device_id arizona_i2c_id[] = {
  89         { "wm5102", WM5102 },
  90         { "wm5110", WM5110 },
  91         { "wm8280", WM8280 },
  92         { "wm8997", WM8997 },
  93         { }
  94 };
  95 MODULE_DEVICE_TABLE(i2c, arizona_i2c_id);
  96
  97 static struct i2c_driver arizona_i2c_driver = {
  98         .driver = {
  99                 .name   = "arizona",
 100                 .owner  = THIS_MODULE,
 101                 .pm     = &arizona_pm_ops,
 102                 .of_match_table = of_match_ptr(arizona_of_match),
 103         },
 104         .probe          = arizona_i2c_probe,
 105         .remove         = arizona_i2c_remove,
 106         .id_table       = arizona_i2c_id,
 107 };
 108
 109 module_i2c_driver(arizona_i2c_driver);
 110
 111 MODULE_DESCRIPTION("Arizona I2C bus interface");
 112 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 113 MODULE_LICENSE("GPL");