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 = NULL;
  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         case WM5102:
  41                 if (IS_ENABLED(CONFIG_MFD_WM5102))
  42                         regmap_config = &wm5102_i2c_regmap;
  43                 break;
  44         case WM5110:
  45         case WM8280:
  46                 if (IS_ENABLED(CONFIG_MFD_WM5110))
  47                         regmap_config = &wm5110_i2c_regmap;
  48                 break;
  49         case WM8997:
  50                 if (IS_ENABLED(CONFIG_MFD_WM8997))
  51                         regmap_config = &wm8997_i2c_regmap;
  52                 break;
  53         case WM8998:
  54         case WM1814:
  55                 if (IS_ENABLED(CONFIG_MFD_WM8998))
  56                         regmap_config = &wm8998_i2c_regmap;
  57                 break;
  58         default:
  59                 dev_err(&i2c->dev, "Unknown device type %ld\n", type);
  60                 return -EINVAL;
  61         }
  62
  63         if (!regmap_config) {
  64                 dev_err(&i2c->dev,
  65                         "No kernel support for device type %ld\n", type);
  66                 return -EINVAL;
  67         }
  68
  69         arizona = devm_kzalloc(&i2c->dev, sizeof(*arizona), GFP_KERNEL);
  70         if (arizona == NULL)
  71                 return -ENOMEM;
  72
  73         arizona->regmap = devm_regmap_init_i2c(i2c, regmap_config);
  74         if (IS_ERR(arizona->regmap)) {
  75                 ret = PTR_ERR(arizona->regmap);
  76                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
  77                         ret);
  78                 return ret;
  79         }
  80
  81         arizona->type = type;
  82         arizona->dev = &i2c->dev;
  83         arizona->irq = i2c->irq;
  84
  85         return arizona_dev_init(arizona);
  86 }
  87
  88 static int arizona_i2c_remove(struct i2c_client *i2c)
  89 {
  90         struct arizona *arizona = dev_get_drvdata(&i2c->dev);
  91
  92         arizona_dev_exit(arizona);
  93
  94         return 0;
  95 }
  96
  97 static const struct i2c_device_id arizona_i2c_id[] = {
  98         { "wm5102", WM5102 },
  99         { "wm5110", WM5110 },
 100         { "wm8280", WM8280 },
 101         { "wm8997", WM8997 },
 102         { "wm8998", WM8998 },
 103         { "wm1814", WM1814 },
 104         { }
 105 };
 106 MODULE_DEVICE_TABLE(i2c, arizona_i2c_id);
 107
 108 static struct i2c_driver arizona_i2c_driver = {
 109         .driver = {
 110                 .name   = "arizona",
 111                 .pm     = &arizona_pm_ops,
 112                 .of_match_table = of_match_ptr(arizona_of_match),
 113         },
 114         .probe          = arizona_i2c_probe,
 115         .remove         = arizona_i2c_remove,
 116         .id_table       = arizona_i2c_id,
 117 };
 118
 119 module_i2c_driver(arizona_i2c_driver);
 120
 121 MODULE_DESCRIPTION("Arizona I2C bus interface");
 122 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 123 MODULE_LICENSE("GPL");