drivers/mfd/mp2629.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * MP2629 parent driver for ADC and battery charger
   4  *
   5  * Copyright 2020 Monolithic Power Systems, Inc
   6  *
   7  * Author: Saravanan Sekar <sravanhome@gmail.com>
   8  */
   9
  10 #include <linux/i2c.h>
  11 #include <linux/kernel.h>
  12 #include <linux/mfd/core.h>
  13 #include <linux/mfd/mp2629.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/regmap.h>
  17 #include <linux/slab.h>
  18
  19 static const struct mfd_cell mp2629_cell[] = {
  20         {
  21                 .name = "mp2629_adc",
  22                 .of_compatible = "mps,mp2629_adc",
  23         },
  24         {
  25                 .name = "mp2629_charger",
  26                 .of_compatible = "mps,mp2629_charger",
  27         }
  28 };
  29
  30 static const struct regmap_config mp2629_regmap_config = {
  31         .reg_bits = 8,
  32         .val_bits = 8,
  33         .max_register = 0x17,
  34 };
  35
  36 static int mp2629_probe(struct i2c_client *client)
  37 {
  38         struct mp2629_data *ddata;
  39         int ret;
  40
  41         ddata = devm_kzalloc(&client->dev, sizeof(*ddata), GFP_KERNEL);
  42         if (!ddata)
  43                 return -ENOMEM;
  44
  45         ddata->dev = &client->dev;
  46         i2c_set_clientdata(client, ddata);
  47
  48         ddata->regmap = devm_regmap_init_i2c(client, &mp2629_regmap_config);
  49         if (IS_ERR(ddata->regmap)) {
  50                 dev_err(ddata->dev, "Failed to allocate regmap\n");
  51                 return PTR_ERR(ddata->regmap);
  52         }
  53
  54         ret = devm_mfd_add_devices(ddata->dev, PLATFORM_DEVID_AUTO, mp2629_cell,
  55                                    ARRAY_SIZE(mp2629_cell), NULL, 0, NULL);
  56         if (ret)
  57                 dev_err(ddata->dev, "Failed to register sub-devices %d\n", ret);
  58
  59         return ret;
  60 }
  61
  62 static const struct of_device_id mp2629_of_match[] = {
  63         { .compatible = "mps,mp2629"},
  64         { }
  65 };
  66 MODULE_DEVICE_TABLE(of, mp2629_of_match);
  67
  68 static struct i2c_driver mp2629_driver = {
  69         .driver = {
  70                 .name = "mp2629",
  71                 .of_match_table = mp2629_of_match,
  72         },
  73         .probe          = mp2629_probe,
  74 };
  75 module_i2c_driver(mp2629_driver);
  76
  77 MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
  78 MODULE_DESCRIPTION("MP2629 Battery charger parent driver");
  79 MODULE_LICENSE("GPL");