// SPDX-License-Identifier: GPL-2.0-only
/*
 * Regulator driver for RICOH RC5T583 power management chip.
 *
 * Copyright (c) 2011-2012, NVIDIA CORPORATION.  All rights reserved.
 * Author: Laxman dewangan <ldewangan@nvidia.com>
 *
 * based on code
 *      Copyright (C) 2011 RICOH COMPANY,LTD
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/rc5t583.h>

struct rc5t583_regulator_info {
        int                     deepsleep_id;

        /* Regulator register address.*/
        uint8_t                 reg_disc_reg;
        uint8_t                 disc_bit;
        uint8_t                 deepsleep_reg;

        /* Regulator specific turn-on delay  and voltage settling time*/
        int                     enable_uv_per_us;

        /* Used by regulator core */
        struct regulator_desc   desc;
};

static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
{
        struct rc5t583_regulator_info *reg_info = rdev_get_drvdata(rdev);
        int vsel = regulator_get_voltage_sel_regmap(rdev);
        int curr_uV = regulator_list_voltage_linear(rdev, vsel);

        return DIV_ROUND_UP(curr_uV, reg_info->enable_uv_per_us);
}

static const struct regulator_ops rc5t583_ops = {
        .is_enabled             = regulator_is_enabled_regmap,
        .enable                 = regulator_enable_regmap,
        .disable                = regulator_disable_regmap,
        .enable_time            = rc5t583_regulator_enable_time,
        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
        .list_voltage           = regulator_list_voltage_linear,
        .map_voltage            = regulator_map_voltage_linear,
        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
};

#define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \
                _vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \
{                                                               \
        .reg_disc_reg   = RC5T583_REG_##_disc_reg,              \
        .disc_bit       = _disc_bit,                            \
        .deepsleep_reg  = RC5T583_REG_##_id##DAC_DS,            \
        .enable_uv_per_us = _enable_mv * 1000,                  \
        .deepsleep_id   = RC5T583_DS_##_id,                     \
        .desc = {                                               \
                .name = "rc5t583-regulator-"#_id,               \
                .id = RC5T583_REGULATOR_##_id,                  \
                .n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
                .ops = &rc5t583_ops,                            \
                .type = REGULATOR_VOLTAGE,                      \
                .owner = THIS_MODULE,                           \
                .vsel_reg = RC5T583_REG_##_id##DAC,             \
                .vsel_mask = _vout_mask,                        \
                .enable_reg = RC5T583_REG_##_en_reg,            \
                .enable_mask = BIT(_en_bit),                    \
                .min_uV = _min_mv * 1000,                       \
                .uV_step = _step_uV,                            \
                .ramp_delay = 40 * 1000,                        \
        },                                                      \
}

static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
        RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4),
        RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14),
        RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14),
        RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14),
        RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160),
        RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160),
        RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160),
        RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160),
        RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133),
        RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267),
        RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133),
        RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233),
        RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233),
        RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133),
};

static int rc5t583_regulator_probe(struct platform_device *pdev)
{
        struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
        struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
        struct regulator_config config = { };
        struct regulator_dev *rdev;
        struct rc5t583_regulator_info *ri;
        int ret;
        int id;

        if (!pdata) {
                dev_err(&pdev->dev, "No platform data, exiting...\n");
                return -ENODEV;
        }

        for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
                ri = &rc5t583_reg_info[id];

                if (ri->deepsleep_id == RC5T583_DS_NONE)
                        goto skip_ext_pwr_config;

                ret = rc5t583_ext_power_req_config(rc5t583->dev,
                                ri->deepsleep_id,
                                pdata->regulator_ext_pwr_control[id],
                                pdata->regulator_deepsleep_slot[id]);
                /*
                 * Configuring external control is not a major issue,
                 * just give warning.
                 */
                if (ret < 0)
                        dev_warn(&pdev->dev,
                                "Failed to configure ext control %d\n", id);

skip_ext_pwr_config:
                config.dev = &pdev->dev;
                config.init_data = pdata->reg_init_data[id];
                config.driver_data = ri;
                config.regmap = rc5t583->regmap;

                rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
                if (IS_ERR(rdev)) {
                        dev_err(&pdev->dev, "Failed to register regulator %s\n",
                                                ri->desc.name);
                        return PTR_ERR(rdev);
                }
        }
        return 0;
}

static struct platform_driver rc5t583_regulator_driver = {
        .driver = {
                .name   = "rc5t583-regulator",
                .probe_type = PROBE_PREFER_ASYNCHRONOUS,
        },
        .probe          = rc5t583_regulator_probe,
};

static int __init rc5t583_regulator_init(void)
{
        return platform_driver_register(&rc5t583_regulator_driver);
}
subsys_initcall(rc5t583_regulator_init);

static void __exit rc5t583_regulator_exit(void)
{
        platform_driver_unregister(&rc5t583_regulator_driver);
}
module_exit(rc5t583_regulator_exit);

MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
MODULE_DESCRIPTION("RC5T583 regulator driver");
MODULE_ALIAS("platform:rc5t583-regulator");
MODULE_LICENSE("GPL v2");