drivers/mfd/lp873x.c

   1 /*
   2  * Copyright (C) 2016 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  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  11  * kind, whether express or implied; without even the implied warranty
  12  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/interrupt.h>
  17 #include <linux/mfd/core.h>
  18 #include <linux/module.h>
  19 #include <linux/of_device.h>
  20 #include <linux/regmap.h>
  21
  22 #include <linux/mfd/lp873x.h>
  23
  24 static const struct regmap_config lp873x_regmap_config = {
  25         .reg_bits = 8,
  26         .val_bits = 8,
  27         .max_register = LP873X_REG_MAX,
  28 };
  29
  30 static const struct mfd_cell lp873x_cells[] = {
  31         { .name = "lp873x-regulator", },
  32         { .name = "lp873x-gpio", },
  33 };
  34
  35 static int lp873x_probe(struct i2c_client *client,
  36                         const struct i2c_device_id *ids)
  37 {
  38         struct lp873x *lp873;
  39         int ret;
  40         unsigned int otpid;
  41
  42         lp873 = devm_kzalloc(&client->dev, sizeof(*lp873), GFP_KERNEL);
  43         if (!lp873)
  44                 return -ENOMEM;
  45
  46         lp873->dev = &client->dev;
  47
  48         lp873->regmap = devm_regmap_init_i2c(client, &lp873x_regmap_config);
  49         if (IS_ERR(lp873->regmap)) {
  50                 ret = PTR_ERR(lp873->regmap);
  51                 dev_err(lp873->dev,
  52                         "Failed to initialize register map: %d\n", ret);
  53                 return ret;
  54         }
  55
  56         ret = regmap_read(lp873->regmap, LP873X_REG_OTP_REV, &otpid);
  57         if (ret) {
  58                 dev_err(lp873->dev, "Failed to read OTP ID\n");
  59                 return ret;
  60         }
  61
  62         lp873->rev = otpid & LP873X_OTP_REV_OTP_ID;
  63
  64         i2c_set_clientdata(client, lp873);
  65
  66         ret = mfd_add_devices(lp873->dev, PLATFORM_DEVID_AUTO, lp873x_cells,
  67                               ARRAY_SIZE(lp873x_cells), NULL, 0, NULL);
  68
  69         return ret;
  70 }
  71
  72 static const struct of_device_id of_lp873x_match_table[] = {
  73         { .compatible = "ti,lp8733", },
  74         { .compatible = "ti,lp8732", },
  75         {}
  76 };
  77 MODULE_DEVICE_TABLE(of, of_lp873x_match_table);
  78
  79 static const struct i2c_device_id lp873x_id_table[] = {
  80         { "lp873x", 0 },
  81         { },
  82 };
  83 MODULE_DEVICE_TABLE(i2c, lp873x_id_table);
  84
  85 static struct i2c_driver lp873x_driver = {
  86         .driver = {
  87                 .name   = "lp873x",
  88                 .of_match_table = of_lp873x_match_table,
  89         },
  90         .probe          = lp873x_probe,
  91         .id_table       = lp873x_id_table,
  92 };
  93 module_i2c_driver(lp873x_driver);
  94
  95 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
  96 MODULE_DESCRIPTION("LP873X chip family Multi-Function Device driver");
  97 MODULE_LICENSE("GPL v2");