// SPDX-License-Identifier: GPL-2.0-only
/*
 * Regulator driver for STw4810/STw4811 VMMC regulator.
 *
 * Copyright (C) 2013 ST-Ericsson SA
 * Written on behalf of Linaro for ST-Ericsson
 *
 * Author: Linus Walleij <linus.walleij@linaro.org>
 */

#include <linux/err.h>
#include <linux/init.h>
#include <linux/mfd/stw481x.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>

static const unsigned int stw481x_vmmc_voltages[] = {
        1800000,
        1800000,
        2850000,
        3000000,
        1850000,
        2600000,
        2700000,
        3300000,
};

static const struct regulator_ops stw481x_vmmc_ops = {
        .list_voltage = regulator_list_voltage_table,
        .enable      = regulator_enable_regmap,
        .disable     = regulator_disable_regmap,
        .is_enabled  = regulator_is_enabled_regmap,
        .get_voltage_sel = regulator_get_voltage_sel_regmap,
        .set_voltage_sel = regulator_set_voltage_sel_regmap,
};

static const struct regulator_desc vmmc_regulator = {
        .name = "VMMC",
        .id   = 0,
        .ops  = &stw481x_vmmc_ops,
        .type = REGULATOR_VOLTAGE,
        .owner = THIS_MODULE,
        .n_voltages = ARRAY_SIZE(stw481x_vmmc_voltages),
        .volt_table = stw481x_vmmc_voltages,
        .enable_time = 200, /* FIXME: look this up */
        .enable_reg = STW_CONF1,
        .enable_mask = STW_CONF1_PDN_VMMC | STW_CONF1_MMC_LS_STATUS,
        .enable_val = STW_CONF1_PDN_VMMC,
        .vsel_reg = STW_CONF1,
        .vsel_mask = STW_CONF1_VMMC_MASK,
};

static int stw481x_vmmc_regulator_probe(struct platform_device *pdev)
{
        struct stw481x *stw481x = dev_get_platdata(&pdev->dev);
        struct regulator_config config = { };
        struct regulator_dev *rdev;
        int ret;

        /* First disable the external VMMC if it's active */
        ret = regmap_update_bits(stw481x->map, STW_CONF2,
                                 STW_CONF2_VMMC_EXT, 0);
        if (ret) {
                dev_err(&pdev->dev, "could not disable external VMMC\n");
                return ret;
        }

        /* Register VMMC regulator */
        config.dev = &pdev->dev;
        config.driver_data = stw481x;
        config.regmap = stw481x->map;
        config.of_node = pdev->dev.of_node;
        config.init_data = of_get_regulator_init_data(&pdev->dev,
                                                      pdev->dev.of_node,
                                                      &vmmc_regulator);

        rdev = devm_regulator_register(&pdev->dev, &vmmc_regulator, &config);
        if (IS_ERR(rdev)) {
                dev_err(&pdev->dev,
                        "error initializing STw481x VMMC regulator\n");
                return PTR_ERR(rdev);
        }

        dev_info(&pdev->dev, "initialized STw481x VMMC regulator\n");
        return 0;
}

static const struct of_device_id stw481x_vmmc_match[] = {
        { .compatible = "st,stw481x-vmmc", },
        {},
};

static struct platform_driver stw481x_vmmc_regulator_driver = {
        .driver = {
                .name  = "stw481x-vmmc-regulator",
                .probe_type = PROBE_PREFER_ASYNCHRONOUS,
                .of_match_table = stw481x_vmmc_match,
        },
        .probe = stw481x_vmmc_regulator_probe,
};

module_platform_driver(stw481x_vmmc_regulator_driver);