// SPDX-License-Identifier: GPL-2.0-only
/*
 * Regulator driver for the Richtek RT5033
 *
 * Copyright (C) 2014 Samsung Electronics, Co., Ltd.
 * Author: Beomho Seo <beomho.seo@samsung.com>
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/mfd/rt5033.h>
#include <linux/mfd/rt5033-private.h>
#include <linux/regulator/of_regulator.h>

static const struct linear_range rt5033_buck_ranges[] = {
        REGULATOR_LINEAR_RANGE(1000000, 0, 20, 100000),
        REGULATOR_LINEAR_RANGE(3000000, 21, 31, 0),
};

static const struct linear_range rt5033_ldo_ranges[] = {
        REGULATOR_LINEAR_RANGE(1200000, 0, 18, 100000),
        REGULATOR_LINEAR_RANGE(3000000, 19, 31, 0),
};

static const struct regulator_ops rt5033_safe_ldo_ops = {
        .is_enabled             = regulator_is_enabled_regmap,
        .enable                 = regulator_enable_regmap,
        .disable                = regulator_disable_regmap,
        .list_voltage           = regulator_list_voltage_linear,
};

static const struct regulator_ops rt5033_buck_ops = {
        .is_enabled             = regulator_is_enabled_regmap,
        .enable                 = regulator_enable_regmap,
        .disable                = regulator_disable_regmap,
        .list_voltage           = regulator_list_voltage_linear_range,
        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
};

static const struct regulator_desc rt5033_supported_regulators[] = {
        [RT5033_BUCK] = {
                .name           = "BUCK",
                .of_match       = of_match_ptr("BUCK"),
                .regulators_node = of_match_ptr("regulators"),
                .id             = RT5033_BUCK,
                .ops            = &rt5033_buck_ops,
                .type           = REGULATOR_VOLTAGE,
                .owner          = THIS_MODULE,
                .n_voltages     = RT5033_REGULATOR_BUCK_VOLTAGE_STEP_NUM,
                .linear_ranges  = rt5033_buck_ranges,
                .n_linear_ranges = ARRAY_SIZE(rt5033_buck_ranges),
                .enable_reg     = RT5033_REG_CTRL,
                .enable_mask    = RT5033_CTRL_EN_BUCK_MASK,
                .vsel_reg       = RT5033_REG_BUCK_CTRL,
                .vsel_mask      = RT5033_BUCK_CTRL_MASK,
        },
        [RT5033_LDO] = {
                .name           = "LDO",
                .of_match       = of_match_ptr("LDO"),
                .regulators_node = of_match_ptr("regulators"),
                .id             = RT5033_LDO,
                .ops            = &rt5033_buck_ops,
                .type           = REGULATOR_VOLTAGE,
                .owner          = THIS_MODULE,
                .n_voltages     = RT5033_REGULATOR_LDO_VOLTAGE_STEP_NUM,
                .linear_ranges  = rt5033_ldo_ranges,
                .n_linear_ranges = ARRAY_SIZE(rt5033_ldo_ranges),
                .enable_reg     = RT5033_REG_CTRL,
                .enable_mask    = RT5033_CTRL_EN_LDO_MASK,
                .vsel_reg       = RT5033_REG_LDO_CTRL,
                .vsel_mask      = RT5033_LDO_CTRL_MASK,
        },
        [RT5033_SAFE_LDO] = {
                .name           = "SAFE_LDO",
                .of_match       = of_match_ptr("SAFE_LDO"),
                .regulators_node = of_match_ptr("regulators"),
                .id             = RT5033_SAFE_LDO,
                .ops            = &rt5033_safe_ldo_ops,
                .type           = REGULATOR_VOLTAGE,
                .owner          = THIS_MODULE,
                .n_voltages     = 1,
                .min_uV         = RT5033_REGULATOR_SAFE_LDO_VOLTAGE,
                .enable_reg     = RT5033_REG_CTRL,
                .enable_mask    = RT5033_CTRL_EN_SAFE_LDO_MASK,
        },
};

static int rt5033_regulator_probe(struct platform_device *pdev)
{
        struct rt5033_dev *rt5033 = dev_get_drvdata(pdev->dev.parent);
        int ret, i;
        struct regulator_config config = {};

        config.dev = rt5033->dev;
        config.driver_data = rt5033;

        for (i = 0; i < ARRAY_SIZE(rt5033_supported_regulators); i++) {
                struct regulator_dev *regulator;

                config.regmap = rt5033->regmap;

                regulator = devm_regulator_register(&pdev->dev,
                                &rt5033_supported_regulators[i], &config);
                if (IS_ERR(regulator)) {
                        ret = PTR_ERR(regulator);
                        dev_err(&pdev->dev,
                                "Regulator init failed %d: with error: %d\n",
                                i, ret);
                        return ret;
                }
        }

        return 0;
}

static const struct platform_device_id rt5033_regulator_id[] = {
        { "rt5033-regulator", },
        { }
};
MODULE_DEVICE_TABLE(platform, rt5033_regulator_id);

static struct platform_driver rt5033_regulator_driver = {
        .driver = {
                .name = "rt5033-regulator",
                .probe_type = PROBE_PREFER_ASYNCHRONOUS,
        },
        .probe          = rt5033_regulator_probe,
        .id_table       = rt5033_regulator_id,
};
module_platform_driver(rt5033_regulator_driver);

MODULE_DESCRIPTION("Richtek RT5033 Regulator driver");
MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
MODULE_LICENSE("GPL");