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                 .of_compatible = "active-semi,act8945a-charger",
  27         },
  28 };
  29
  30 static const struct regmap_config act8945a_regmap_config = {
  31         .reg_bits = 8,
  32         .val_bits = 8,
  33 };
  34
  35 static int act8945a_i2c_probe(struct i2c_client *i2c,
  36                               const struct i2c_device_id *id)
  37 {
  38         int ret;
  39         struct regmap *regmap;
  40
  41         regmap = devm_regmap_init_i2c(i2c, &act8945a_regmap_config);
  42         if (IS_ERR(regmap)) {
  43                 ret = PTR_ERR(regmap);
  44                 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
  45                 return ret;
  46         }
  47
  48         i2c_set_clientdata(i2c, regmap);
  49
  50         ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE,
  51                                    act8945a_devs, ARRAY_SIZE(act8945a_devs),
  52                                    NULL, 0, NULL);
  53         if (ret) {
  54                 dev_err(&i2c->dev, "Failed to add sub devices\n");
  55                 return ret;
  56         }
  57
  58         return 0;
  59 }
  60
  61 static const struct i2c_device_id act8945a_i2c_id[] = {
  62         { "act8945a", 0 },
  63         {}
  64 };
  65 MODULE_DEVICE_TABLE(i2c, act8945a_i2c_id);
  66
  67 static const struct of_device_id act8945a_of_match[] = {
  68         { .compatible = "active-semi,act8945a", },
  69         {},
  70 };
  71 MODULE_DEVICE_TABLE(of, act8945a_of_match);
  72
  73 static struct i2c_driver act8945a_i2c_driver = {
  74         .driver = {
  75                    .name = "act8945a",
  76                    .of_match_table = of_match_ptr(act8945a_of_match),
  77         },
  78         .probe = act8945a_i2c_probe,
  79         .id_table = act8945a_i2c_id,
  80 };
  81
  82 static int __init act8945a_i2c_init(void)
  83 {
  84         return i2c_add_driver(&act8945a_i2c_driver);
  85 }
  86 subsys_initcall(act8945a_i2c_init);
  87
  88 static void __exit act8945a_i2c_exit(void)
  89 {
  90         i2c_del_driver(&act8945a_i2c_driver);
  91 }
  92 module_exit(act8945a_i2c_exit);
  93
  94 MODULE_DESCRIPTION("ACT8945A PMIC multi-function driver");
  95 MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
  96 MODULE_LICENSE("GPL");