drivers/mfd/da9055-i2c.c

   1  /* I2C access for DA9055 PMICs.
   2  *
   3  * Copyright(c) 2012 Dialog Semiconductor Ltd.
   4  *
   5  * Author: David Dajun Chen <dchen@diasemi.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/device.h>
  16 #include <linux/i2c.h>
  17 #include <linux/err.h>
  18 #include <linux/of.h>
  19 #include <linux/of_device.h>
  20
  21 #include <linux/mfd/da9055/core.h>
  22
  23 static int da9055_i2c_probe(struct i2c_client *i2c,
  24                                       const struct i2c_device_id *id)
  25 {
  26         struct da9055 *da9055;
  27         int ret;
  28
  29         da9055 = devm_kzalloc(&i2c->dev, sizeof(struct da9055), GFP_KERNEL);
  30         if (!da9055)
  31                 return -ENOMEM;
  32
  33         da9055->regmap = devm_regmap_init_i2c(i2c, &da9055_regmap_config);
  34         if (IS_ERR(da9055->regmap)) {
  35                 ret = PTR_ERR(da9055->regmap);
  36                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
  37                         ret);
  38                 return ret;
  39         }
  40
  41         da9055->dev = &i2c->dev;
  42         da9055->chip_irq = i2c->irq;
  43
  44         i2c_set_clientdata(i2c, da9055);
  45
  46         return da9055_device_init(da9055);
  47 }
  48
  49 static int da9055_i2c_remove(struct i2c_client *i2c)
  50 {
  51         struct da9055 *da9055 = i2c_get_clientdata(i2c);
  52
  53         da9055_device_exit(da9055);
  54
  55         return 0;
  56 }
  57
  58 /*
  59  * DO NOT change the device Ids. The naming is intentionally specific as both
  60  * the PMIC and CODEC parts of this chip are instantiated separately as I2C
  61  * devices (both have configurable I2C addresses, and are to all intents and
  62  * purposes separate). As a result there are specific DA9055 ids for PMIC
  63  * and CODEC, which must be different to operate together.
  64  */
  65 static struct i2c_device_id da9055_i2c_id[] = {
  66         {"da9055-pmic", 0},
  67         { }
  68 };
  69 MODULE_DEVICE_TABLE(i2c, da9055_i2c_id);
  70
  71 static const struct of_device_id da9055_of_match[] = {
  72         { .compatible = "dlg,da9055-pmic", },
  73         { }
  74 };
  75
  76 static struct i2c_driver da9055_i2c_driver = {
  77         .probe = da9055_i2c_probe,
  78         .remove = da9055_i2c_remove,
  79         .id_table = da9055_i2c_id,
  80         .driver = {
  81                 .name = "da9055-pmic",
  82                 .owner = THIS_MODULE,
  83                 .of_match_table = of_match_ptr(da9055_of_match),
  84         },
  85 };
  86
  87 static int __init da9055_i2c_init(void)
  88 {
  89         int ret;
  90
  91         ret = i2c_add_driver(&da9055_i2c_driver);
  92         if (ret != 0) {
  93                 pr_err("DA9055 I2C registration failed %d\n", ret);
  94                 return ret;
  95         }
  96
  97         return 0;
  98 }
  99 subsys_initcall(da9055_i2c_init);
 100
 101 static void __exit da9055_i2c_exit(void)
 102 {
 103         i2c_del_driver(&da9055_i2c_driver);
 104 }
 105 module_exit(da9055_i2c_exit);
 106
 107 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 108 MODULE_DESCRIPTION("I2C driver for Dialog DA9055 PMIC");
 109 MODULE_LICENSE("GPL");