// SPDX-License-Identifier: GPL-2.0
//
// Regulator Driver for Freescale MC13xxx PMIC
//
// Copyright 2010 Yong Shen <yong.shen@linaro.org>
//
// Based on mc13783 regulator driver :
// Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
// Copyright 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
//
// Regs infos taken from mc13xxx drivers from freescale and mc13xxx.pdf file
// from freescale

#include <linux/mfd/mc13xxx.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include "mc13xxx.h"

static int mc13xxx_regulator_enable(struct regulator_dev *rdev)
{
        struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
        struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
        int id = rdev_get_id(rdev);

        dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

        return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
                               mc13xxx_regulators[id].enable_bit,
                               mc13xxx_regulators[id].enable_bit);
}

static int mc13xxx_regulator_disable(struct regulator_dev *rdev)
{
        struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
        struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
        int id = rdev_get_id(rdev);

        dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

        return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
                               mc13xxx_regulators[id].enable_bit, 0);
}

static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev)
{
        struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
        struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
        int ret, id = rdev_get_id(rdev);
        unsigned int val;

        ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val);
        if (ret)
                return ret;

        return (val & mc13xxx_regulators[id].enable_bit) != 0;
}

static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev,
                                             unsigned selector)
{
        struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
        struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
        int id = rdev_get_id(rdev);

        return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
                               mc13xxx_regulators[id].vsel_mask,
                               selector << mc13xxx_regulators[id].vsel_shift);
}

static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)
{
        struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
        struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
        int ret, id = rdev_get_id(rdev);
        unsigned int val;

        dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);

        ret = mc13xxx_reg_read(priv->mc13xxx,
                                mc13xxx_regulators[id].vsel_reg, &val);
        if (ret)
                return ret;

        val = (val & mc13xxx_regulators[id].vsel_mask)
                >> mc13xxx_regulators[id].vsel_shift;

        dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);

        BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages);

        return rdev->desc->volt_table[val];
}

const struct regulator_ops mc13xxx_regulator_ops = {
        .enable = mc13xxx_regulator_enable,
        .disable = mc13xxx_regulator_disable,
        .is_enabled = mc13xxx_regulator_is_enabled,
        .list_voltage = regulator_list_voltage_table,
        .set_voltage_sel = mc13xxx_regulator_set_voltage_sel,
        .get_voltage = mc13xxx_regulator_get_voltage,
};
EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);

int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
               int max_uV, unsigned *selector)
{
        int id = rdev_get_id(rdev);

        dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
                __func__, id, min_uV, max_uV);

        if (min_uV <= rdev->desc->volt_table[0] &&
            rdev->desc->volt_table[0] <= max_uV) {
                *selector = 0;
                return 0;
        } else {
                return -EINVAL;
        }
}
EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);

const struct regulator_ops mc13xxx_fixed_regulator_ops = {
        .enable = mc13xxx_regulator_enable,
        .disable = mc13xxx_regulator_disable,
        .is_enabled = mc13xxx_regulator_is_enabled,
        .list_voltage = regulator_list_voltage_table,
        .set_voltage = mc13xxx_fixed_regulator_set_voltage,
};
EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);

#ifdef CONFIG_OF
int mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
{
        struct device_node *parent;
        int num;

        if (!pdev->dev.parent->of_node)
                return -ENODEV;

        parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
        if (!parent)
                return -ENODEV;

        num = of_get_child_count(parent);
        of_node_put(parent);
        return num;
}
EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);

struct mc13xxx_regulator_init_data *mc13xxx_parse_regulators_dt(
        struct platform_device *pdev, struct mc13xxx_regulator *regulators,
        int num_regulators)
{
        struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
        struct mc13xxx_regulator_init_data *data, *p;
        struct device_node *parent, *child;
        int i, parsed = 0;

        if (!pdev->dev.parent->of_node)
                return NULL;

        parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
        if (!parent)
                return NULL;

        data = devm_kcalloc(&pdev->dev, priv->num_regulators, sizeof(*data),
                            GFP_KERNEL);
        if (!data) {
                of_node_put(parent);
                return NULL;
        }

        p = data;

        for_each_child_of_node(parent, child) {
                int found = 0;

                for (i = 0; i < num_regulators; i++) {
                        if (!regulators[i].desc.name)
                                continue;
                        if (of_node_name_eq(child,
                                         regulators[i].desc.name)) {
                                p->id = i;
                                p->init_data = of_get_regulator_init_data(
                                                        &pdev->dev, child,
                                                        &regulators[i].desc);
                                p->node = child;
                                p++;

                                parsed++;
                                found = 1;
                                break;
                        }
                }

                if (!found)
                        dev_warn(&pdev->dev,
                                 "Unknown regulator: %pOFn\n", child);
        }
        of_node_put(parent);

        priv->num_regulators = parsed;

        return data;
}
EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
#endif

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
MODULE_ALIAS("mc13xxx-regulator-core");