// SPDX-License-Identifier: GPL-2.0+
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>

static const struct regulator_ops max8893_ops = {
        .is_enabled             = regulator_is_enabled_regmap,
        .enable                 = regulator_enable_regmap,
        .disable                = regulator_disable_regmap,
        .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,
};

static const struct regulator_desc max8893_regulators[] = {
        {
                .name = "BUCK",
                .supply_name = "in-buck",
                .of_match = of_match_ptr("buck"),
                .regulators_node = of_match_ptr("regulators"),
                .n_voltages = 0x11,
                .id = 6,
                .ops = &max8893_ops,
                .type = REGULATOR_VOLTAGE,
                .owner = THIS_MODULE,
                .min_uV = 800000,
                .uV_step = 100000,
                .vsel_reg = 0x4,
                .vsel_mask = 0x1f,
                .enable_reg = 0x0,
                .enable_mask = BIT(7),
        },
        {
                .name = "LDO1",
                .supply_name = "in-ldo1",
                .of_match = of_match_ptr("ldo1"),
                .regulators_node = of_match_ptr("regulators"),
                .n_voltages = 0x12,
                .id = 1,
                .ops = &max8893_ops,
                .type = REGULATOR_VOLTAGE,
                .owner = THIS_MODULE,
                .min_uV = 1600000,
                .uV_step = 100000,
                .vsel_reg = 0x5,
                .vsel_mask = 0x1f,
                .enable_reg = 0x0,
                .enable_mask = BIT(5),
        },
        {
                .name = "LDO2",
                .supply_name = "in-ldo2",
                .of_match = of_match_ptr("ldo2"),
                .regulators_node = of_match_ptr("regulators"),
                .n_voltages = 0x16,
                .id = 2,
                .ops = &max8893_ops,
                .type = REGULATOR_VOLTAGE,
                .owner = THIS_MODULE,
                .min_uV = 1200000,
                .uV_step = 100000,
                .vsel_reg = 0x6,
                .vsel_mask = 0x1f,
                .enable_reg = 0x0,
                .enable_mask = BIT(4),
        },
        {
                .name = "LDO3",
                .supply_name = "in-ldo3",
                .of_match = of_match_ptr("ldo3"),
                .regulators_node = of_match_ptr("regulators"),
                .n_voltages = 0x12,
                .id = 3,
                .ops = &max8893_ops,
                .type = REGULATOR_VOLTAGE,
                .owner = THIS_MODULE,
                .min_uV = 1600000,
                .uV_step = 100000,
                .vsel_reg = 0x7,
                .vsel_mask = 0x1f,
                .enable_reg = 0x0,
                .enable_mask = BIT(3),
        },
        {
                .name = "LDO4",
                .supply_name = "in-ldo4",
                .of_match = of_match_ptr("ldo4"),
                .regulators_node = of_match_ptr("regulators"),
                .n_voltages = 0x1a,
                .id = 4,
                .ops = &max8893_ops,
                .type = REGULATOR_VOLTAGE,
                .owner = THIS_MODULE,
                .min_uV = 800000,
                .uV_step = 100000,
                .vsel_reg = 0x8,
                .vsel_mask = 0x1f,
                .enable_reg = 0x0,
                .enable_mask = BIT(2),
        },
        {
                .name = "LDO5",
                .supply_name = "in-ldo5",
                .of_match = of_match_ptr("ldo5"),
                .regulators_node = of_match_ptr("regulators"),
                .n_voltages = 0x1a,
                .id = 5,
                .ops = &max8893_ops,
                .type = REGULATOR_VOLTAGE,
                .owner = THIS_MODULE,
                .min_uV = 800000,
                .uV_step = 100000,
                .vsel_reg = 0x9,
                .vsel_mask = 0x1f,
                .enable_reg = 0x0,
                .enable_mask = BIT(1),
        }
};

static const struct regmap_config max8893_regmap = {
        .reg_bits = 8,
        .val_bits = 8,
};

static int max8893_probe(struct i2c_client *i2c)
{
        int id, ret;
        struct regulator_config config = {.dev = &i2c->dev};
        struct regmap *regmap = devm_regmap_init_i2c(i2c, &max8893_regmap);

        if (IS_ERR(regmap)) {
                ret = PTR_ERR(regmap);
                dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
                return ret;
        }

        for (id = 0; id < ARRAY_SIZE(max8893_regulators); id++) {
                struct regulator_dev *rdev;
                rdev = devm_regulator_register(&i2c->dev,
                                               &max8893_regulators[id],
                                               &config);
                if (IS_ERR(rdev)) {
                        ret = PTR_ERR(rdev);
                        dev_err(&i2c->dev, "failed to register %s: %d\n",
                                max8893_regulators[id].name, ret);
                        return ret;
                }
        }

        return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id max8893_dt_match[] = {
        { .compatible = "maxim,max8893" },
        { /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, max8893_dt_match);
#endif

static const struct i2c_device_id max8893_ids[] = {
        { "max8893" },
        { }
};
MODULE_DEVICE_TABLE(i2c, max8893_ids);

static struct i2c_driver max8893_driver = {
        .probe          = max8893_probe,
        .driver         = {
                .name   = "max8893",
                .probe_type = PROBE_PREFER_ASYNCHRONOUS,
                .of_match_table = of_match_ptr(max8893_dt_match),
        },
        .id_table       = max8893_ids,
};

module_i2c_driver(max8893_driver);

MODULE_DESCRIPTION("Maxim MAX8893 PMIC driver");
MODULE_AUTHOR("Sergey Larin <cerg2010cerg2010@mail.ru>");
MODULE_LICENSE("GPL");