LXR linux/drivers/mfd/lp87565.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com/
   4 *
   5 * Author: Keerthy <j-keerthy@ti.com>
   6 */
   7
   8#include <linux/gpio/consumer.h>
   9#include <linux/interrupt.h>
  10#include <linux/mfd/core.h>
  11#include <linux/module.h>
  12#include <linux/of_device.h>
  13#include <linux/regmap.h>
  14
  15#include <linux/mfd/lp87565.h>
  16
  17static const struct regmap_config lp87565_regmap_config = {
  18        .reg_bits = 8,
  19        .val_bits = 8,
  20        .max_register = LP87565_REG_MAX,
  21};
  22
  23static const struct mfd_cell lp87565_cells[] = {
  24        { .name = "lp87565-q1-regulator", },
  25        { .name = "lp87565-q1-gpio", },
  26};
  27
  28static const struct of_device_id of_lp87565_match_table[] = {
  29        { .compatible = "ti,lp87565", },
  30        {
  31                .compatible = "ti,lp87524-q1",
  32                .data = (void *)LP87565_DEVICE_TYPE_LP87524_Q1,
  33        },
  34        {
  35                .compatible = "ti,lp87565-q1",
  36                .data = (void *)LP87565_DEVICE_TYPE_LP87565_Q1,
  37        },
  38        {
  39                .compatible = "ti,lp87561-q1",
  40                .data = (void *)LP87565_DEVICE_TYPE_LP87561_Q1,
  41        },
  42        {}
  43};
  44MODULE_DEVICE_TABLE(of, of_lp87565_match_table);
  45
  46static int lp87565_probe(struct i2c_client *client,
  47                         const struct i2c_device_id *ids)
  48{
  49        struct lp87565 *lp87565;
  50        const struct of_device_id *of_id;
  51        int ret;
  52        unsigned int otpid;
  53
  54        lp87565 = devm_kzalloc(&client->dev, sizeof(*lp87565), GFP_KERNEL);
  55        if (!lp87565)
  56                return -ENOMEM;
  57
  58        lp87565->dev = &client->dev;
  59
  60        lp87565->regmap = devm_regmap_init_i2c(client, &lp87565_regmap_config);
  61        if (IS_ERR(lp87565->regmap)) {
  62                ret = PTR_ERR(lp87565->regmap);
  63                dev_err(lp87565->dev,
  64                        "Failed to initialize register map: %d\n", ret);
  65                return ret;
  66        }
  67
  68        lp87565->reset_gpio = devm_gpiod_get_optional(lp87565->dev, "reset",
  69                                                      GPIOD_OUT_LOW);
  70        if (IS_ERR(lp87565->reset_gpio)) {
  71                ret = PTR_ERR(lp87565->reset_gpio);
  72                if (ret == -EPROBE_DEFER)
  73                        return ret;
  74        }
  75
  76        if (lp87565->reset_gpio) {
  77                gpiod_set_value_cansleep(lp87565->reset_gpio, 1);
  78                /* The minimum assertion time is undocumented, just guess */
  79                usleep_range(2000, 4000);
  80
  81                gpiod_set_value_cansleep(lp87565->reset_gpio, 0);
  82                /* Min 1.2 ms before first I2C transaction */
  83                usleep_range(1500, 3000);
  84        }
  85
  86        ret = regmap_read(lp87565->regmap, LP87565_REG_OTP_REV, &otpid);
  87        if (ret) {
  88                dev_err(lp87565->dev, "Failed to read OTP ID\n");
  89                return ret;
  90        }
  91
  92        lp87565->rev = otpid & LP87565_OTP_REV_OTP_ID;
  93
  94        of_id = of_match_device(of_lp87565_match_table, &client->dev);
  95        if (of_id)
  96                lp87565->dev_type = (enum lp87565_device_type)of_id->data;
  97
  98        i2c_set_clientdata(client, lp87565);
  99
 100        return devm_mfd_add_devices(lp87565->dev, PLATFORM_DEVID_AUTO,
 101                                    lp87565_cells, ARRAY_SIZE(lp87565_cells),
 102                                    NULL, 0, NULL);
 103}
 104
 105static void lp87565_shutdown(struct i2c_client *client)
 106{
 107        struct lp87565 *lp87565 = i2c_get_clientdata(client);
 108
 109        gpiod_set_value_cansleep(lp87565->reset_gpio, 1);
 110}
 111
 112static const struct i2c_device_id lp87565_id_table[] = {
 113        { "lp87565-q1", 0 },
 114        { },
 115};
 116MODULE_DEVICE_TABLE(i2c, lp87565_id_table);
 117
 118static struct i2c_driver lp87565_driver = {
 119        .driver = {
 120                .name   = "lp87565",
 121                .of_match_table = of_lp87565_match_table,
 122        },
 123        .probe = lp87565_probe,
 124        .shutdown = lp87565_shutdown,
 125        .id_table = lp87565_id_table,
 126};
 127module_i2c_driver(lp87565_driver);
 128
 129MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
 130MODULE_DESCRIPTION("lp87565 chip family Multi-Function Device driver");
 131MODULE_LICENSE("GPL v2");
 132