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
  19 #include <linux/mfd/da9055/core.h>
  20
  21 static int da9055_i2c_probe(struct i2c_client *i2c,
  22                                       const struct i2c_device_id *id)
  23 {
  24         struct da9055 *da9055;
  25         int ret;
  26
  27         da9055 = devm_kzalloc(&i2c->dev, sizeof(struct da9055), GFP_KERNEL);
  28         if (!da9055)
  29                 return -ENOMEM;
  30
  31         da9055->regmap = devm_regmap_init_i2c(i2c, &da9055_regmap_config);
  32         if (IS_ERR(da9055->regmap)) {
  33                 ret = PTR_ERR(da9055->regmap);
  34                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
  35                         ret);
  36                 return ret;
  37         }
  38
  39         da9055->dev = &i2c->dev;
  40         da9055->chip_irq = i2c->irq;
  41
  42         i2c_set_clientdata(i2c, da9055);
  43
  44         return da9055_device_init(da9055);
  45 }
  46
  47 static int da9055_i2c_remove(struct i2c_client *i2c)
  48 {
  49         struct da9055 *da9055 = i2c_get_clientdata(i2c);
  50
  51         da9055_device_exit(da9055);
  52
  53         return 0;
  54 }
  55
  56 /*
  57  * DO NOT change the device Ids. The naming is intentionally specific as both
  58  * the PMIC and CODEC parts of this chip are instantiated separately as I2C
  59  * devices (both have configurable I2C addresses, and are to all intents and
  60  * purposes separate). As a result there are specific DA9055 ids for PMIC
  61  * and CODEC, which must be different to operate together.
  62  */
  63 static struct i2c_device_id da9055_i2c_id[] = {
  64         {"da9055-pmic", 0},
  65         { }
  66 };
  67 MODULE_DEVICE_TABLE(i2c, da9055_i2c_id);
  68
  69 static struct i2c_driver da9055_i2c_driver = {
  70         .probe = da9055_i2c_probe,
  71         .remove = da9055_i2c_remove,
  72         .id_table = da9055_i2c_id,
  73         .driver = {
  74                 .name = "da9055-pmic",
  75                 .owner = THIS_MODULE,
  76         },
  77 };
  78
  79 static int __init da9055_i2c_init(void)
  80 {
  81         int ret;
  82
  83         ret = i2c_add_driver(&da9055_i2c_driver);
  84         if (ret != 0) {
  85                 pr_err("DA9055 I2C registration failed %d\n", ret);
  86                 return ret;
  87         }
  88
  89         return 0;
  90 }
  91 subsys_initcall(da9055_i2c_init);
  92
  93 static void __exit da9055_i2c_exit(void)
  94 {
  95         i2c_del_driver(&da9055_i2c_driver);
  96 }
  97 module_exit(da9055_i2c_exit);
  98
  99 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 100 MODULE_DESCRIPTION("I2C driver for Dialog DA9055 PMIC");
 101 MODULE_LICENSE("GPL");