drivers/mfd/lp87565.c

   1 /*
   2  * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
   3  *
   4  * Author: Keerthy <j-keerthy@ti.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation version 2.
   9  */
  10
  11 #include <linux/interrupt.h>
  12 #include <linux/mfd/core.h>
  13 #include <linux/module.h>
  14 #include <linux/of_device.h>
  15 #include <linux/regmap.h>
  16
  17 #include <linux/mfd/lp87565.h>
  18
  19 static const struct regmap_config lp87565_regmap_config = {
  20         .reg_bits = 8,
  21         .val_bits = 8,
  22         .max_register = LP87565_REG_MAX,
  23 };
  24
  25 static const struct mfd_cell lp87565_cells[] = {
  26         { .name = "lp87565-q1-regulator", },
  27         { .name = "lp87565-q1-gpio", },
  28 };
  29
  30 static const struct of_device_id of_lp87565_match_table[] = {
  31         { .compatible = "ti,lp87565", },
  32         {
  33                 .compatible = "ti,lp87565-q1",
  34                 .data = (void *)LP87565_DEVICE_TYPE_LP87565_Q1,
  35         },
  36         {}
  37 };
  38 MODULE_DEVICE_TABLE(of, of_lp87565_match_table);
  39
  40 static int lp87565_probe(struct i2c_client *client,
  41                          const struct i2c_device_id *ids)
  42 {
  43         struct lp87565 *lp87565;
  44         const struct of_device_id *of_id;
  45         int ret;
  46         unsigned int otpid;
  47
  48         lp87565 = devm_kzalloc(&client->dev, sizeof(*lp87565), GFP_KERNEL);
  49         if (!lp87565)
  50                 return -ENOMEM;
  51
  52         lp87565->dev = &client->dev;
  53
  54         lp87565->regmap = devm_regmap_init_i2c(client, &lp87565_regmap_config);
  55         if (IS_ERR(lp87565->regmap)) {
  56                 ret = PTR_ERR(lp87565->regmap);
  57                 dev_err(lp87565->dev,
  58                         "Failed to initialize register map: %d\n", ret);
  59                 return ret;
  60         }
  61
  62         ret = regmap_read(lp87565->regmap, LP87565_REG_OTP_REV, &otpid);
  63         if (ret) {
  64                 dev_err(lp87565->dev, "Failed to read OTP ID\n");
  65                 return ret;
  66         }
  67
  68         lp87565->rev = otpid & LP87565_OTP_REV_OTP_ID;
  69
  70         of_id = of_match_device(of_lp87565_match_table, &client->dev);
  71         if (of_id)
  72                 lp87565->dev_type = (enum lp87565_device_type)of_id->data;
  73
  74         i2c_set_clientdata(client, lp87565);
  75
  76         return devm_mfd_add_devices(lp87565->dev, PLATFORM_DEVID_AUTO,
  77                                     lp87565_cells, ARRAY_SIZE(lp87565_cells),
  78                                     NULL, 0, NULL);
  79 }
  80
  81 static const struct i2c_device_id lp87565_id_table[] = {
  82         { "lp87565-q1", 0 },
  83         { },
  84 };
  85 MODULE_DEVICE_TABLE(i2c, lp87565_id_table);
  86
  87 static struct i2c_driver lp87565_driver = {
  88         .driver = {
  89                 .name   = "lp87565",
  90                 .of_match_table = of_lp87565_match_table,
  91         },
  92         .probe = lp87565_probe,
  93         .id_table = lp87565_id_table,
  94 };
  95 module_i2c_driver(lp87565_driver);
  96
  97 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
  98 MODULE_DESCRIPTION("lp87565 chip family Multi-Function Device driver");
  99 MODULE_LICENSE("GPL v2");