drivers/mfd/lp873x.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2016 Texas Instruments Incorporated - https://www.ti.com/
   4  *
   5  * Author: Keerthy <j-keerthy@ti.com>
   6  */
   7
   8 #include <linux/interrupt.h>
   9 #include <linux/mfd/core.h>
  10 #include <linux/mod_devicetable.h>
  11 #include <linux/module.h>
  12 #include <linux/regmap.h>
  13
  14 #include <linux/mfd/lp873x.h>
  15
  16 static const struct regmap_config lp873x_regmap_config = {
  17         .reg_bits = 8,
  18         .val_bits = 8,
  19         .max_register = LP873X_REG_MAX,
  20 };
  21
  22 static const struct mfd_cell lp873x_cells[] = {
  23         { .name = "lp873x-regulator", },
  24         { .name = "lp873x-gpio", },
  25 };
  26
  27 static int lp873x_probe(struct i2c_client *client)
  28 {
  29         struct lp873x *lp873;
  30         int ret;
  31         unsigned int otpid;
  32
  33         lp873 = devm_kzalloc(&client->dev, sizeof(*lp873), GFP_KERNEL);
  34         if (!lp873)
  35                 return -ENOMEM;
  36
  37         lp873->dev = &client->dev;
  38
  39         lp873->regmap = devm_regmap_init_i2c(client, &lp873x_regmap_config);
  40         if (IS_ERR(lp873->regmap)) {
  41                 ret = PTR_ERR(lp873->regmap);
  42                 dev_err(lp873->dev,
  43                         "Failed to initialize register map: %d\n", ret);
  44                 return ret;
  45         }
  46
  47         ret = regmap_read(lp873->regmap, LP873X_REG_OTP_REV, &otpid);
  48         if (ret) {
  49                 dev_err(lp873->dev, "Failed to read OTP ID\n");
  50                 return ret;
  51         }
  52
  53         lp873->rev = otpid & LP873X_OTP_REV_OTP_ID;
  54
  55         i2c_set_clientdata(client, lp873);
  56
  57         ret = mfd_add_devices(lp873->dev, PLATFORM_DEVID_AUTO, lp873x_cells,
  58                               ARRAY_SIZE(lp873x_cells), NULL, 0, NULL);
  59
  60         return ret;
  61 }
  62
  63 static const struct of_device_id of_lp873x_match_table[] = {
  64         { .compatible = "ti,lp8733", },
  65         { .compatible = "ti,lp8732", },
  66         {}
  67 };
  68 MODULE_DEVICE_TABLE(of, of_lp873x_match_table);
  69
  70 static const struct i2c_device_id lp873x_id_table[] = {
  71         { "lp873x" },
  72         { }
  73 };
  74 MODULE_DEVICE_TABLE(i2c, lp873x_id_table);
  75
  76 static struct i2c_driver lp873x_driver = {
  77         .driver = {
  78                 .name   = "lp873x",
  79                 .of_match_table = of_lp873x_match_table,
  80         },
  81         .probe          = lp873x_probe,
  82         .id_table       = lp873x_id_table,
  83 };
  84 module_i2c_driver(lp873x_driver);
  85
  86 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
  87 MODULE_DESCRIPTION("LP873X chip family Multi-Function Device driver");
  88 MODULE_LICENSE("GPL v2");