LXR linux/drivers/mfd/lp873x.c

   1/*
   2 * Copyright (C) 2016 Texas Instruments Incorporated - https://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
  24static const struct regmap_config lp873x_regmap_config = {
  25        .reg_bits = 8,
  26        .val_bits = 8,
  27        .max_register = LP873X_REG_MAX,
  28};
  29
  30static const struct mfd_cell lp873x_cells[] = {
  31        { .name = "lp873x-regulator", },
  32        { .name = "lp873x-gpio", },
  33};
  34
  35static 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
  72static const struct of_device_id of_lp873x_match_table[] = {
  73        { .compatible = "ti,lp8733", },
  74        { .compatible = "ti,lp8732", },
  75        {}
  76};
  77MODULE_DEVICE_TABLE(of, of_lp873x_match_table);
  78
  79static const struct i2c_device_id lp873x_id_table[] = {
  80        { "lp873x", 0 },
  81        { },
  82};
  83MODULE_DEVICE_TABLE(i2c, lp873x_id_table);
  84
  85static 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};
  93module_i2c_driver(lp873x_driver);
  94
  95MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
  96MODULE_DESCRIPTION("LP873X chip family Multi-Function Device driver");
  97MODULE_LICENSE("GPL v2");
  98