drivers/mfd/act8945a.c

   1 /*
   2  * MFD driver for Active-semi ACT8945a PMIC
   3  *
   4  * Copyright (C) 2015 Atmel Corporation.
   5  *
   6  * Author: Wenyou Yang <wenyou.yang@atmel.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under  the terms of the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #include <linux/i2c.h>
  15 #include <linux/mfd/core.h>
  16 #include <linux/module.h>
  17 #include <linux/of_device.h>
  18 #include <linux/regmap.h>
  19
  20 static const struct mfd_cell act8945a_devs[] = {
  21         {
  22                 .name = "act8945a-regulator",
  23         },
  24         {
  25                 .name = "act8945a-charger",
  26         },
  27 };
  28
  29 static const struct regmap_config act8945a_regmap_config = {
  30         .reg_bits = 8,
  31         .val_bits = 8,
  32 };
  33
  34 static int act8945a_i2c_probe(struct i2c_client *i2c,
  35                               const struct i2c_device_id *id)
  36 {
  37         int ret;
  38         struct regmap *regmap;
  39
  40         regmap = devm_regmap_init_i2c(i2c, &act8945a_regmap_config);
  41         if (IS_ERR(regmap)) {
  42                 ret = PTR_ERR(regmap);
  43                 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
  44                 return ret;
  45         }
  46
  47         i2c_set_clientdata(i2c, regmap);
  48
  49         ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
  50                                    act8945a_devs, ARRAY_SIZE(act8945a_devs),
  51                                    NULL, 0, NULL);
  52         if (ret) {
  53                 dev_err(&i2c->dev, "Failed to add sub devices\n");
  54                 return ret;
  55         }
  56
  57         return 0;
  58 }
  59
  60 static const struct i2c_device_id act8945a_i2c_id[] = {
  61         { "act8945a", 0 },
  62         {}
  63 };
  64 MODULE_DEVICE_TABLE(i2c, act8945a_i2c_id);
  65
  66 static const struct of_device_id act8945a_of_match[] = {
  67         { .compatible = "active-semi,act8945a", },
  68         {},
  69 };
  70 MODULE_DEVICE_TABLE(of, act8945a_of_match);
  71
  72 static struct i2c_driver act8945a_i2c_driver = {
  73         .driver = {
  74                    .name = "act8945a",
  75                    .of_match_table = of_match_ptr(act8945a_of_match),
  76         },
  77         .probe = act8945a_i2c_probe,
  78         .id_table = act8945a_i2c_id,
  79 };
  80
  81 static int __init act8945a_i2c_init(void)
  82 {
  83         return i2c_add_driver(&act8945a_i2c_driver);
  84 }
  85 subsys_initcall(act8945a_i2c_init);
  86
  87 static void __exit act8945a_i2c_exit(void)
  88 {
  89         i2c_del_driver(&act8945a_i2c_driver);
  90 }
  91 module_exit(act8945a_i2c_exit);
  92
  93 MODULE_DESCRIPTION("ACT8945A PMIC multi-function driver");
  94 MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
  95 MODULE_LICENSE("GPL");