// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * isl9305 - Intersil ISL9305 DCDC regulator
 *
 * Copyright 2014 Linaro Ltd
 *
 * Author: Mark Brown <broonie@kernel.org>
 */

#include <linux/module.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/of.h>
#include <linux/platform_data/isl9305.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#include <linux/slab.h>

/*
 * Registers
 */
#define ISL9305_DCD1OUT          0x0
#define ISL9305_DCD2OUT          0x1
#define ISL9305_LDO1OUT          0x2
#define ISL9305_LDO2OUT          0x3
#define ISL9305_DCD_PARAMETER    0x4
#define ISL9305_SYSTEM_PARAMETER 0x5
#define ISL9305_DCD_SRCTL        0x6

#define ISL9305_MAX_REG ISL9305_DCD_SRCTL

/*
 * DCD_PARAMETER
 */
#define ISL9305_DCD_PHASE   0x40
#define ISL9305_DCD2_ULTRA  0x20
#define ISL9305_DCD1_ULTRA  0x10
#define ISL9305_DCD2_BLD    0x08
#define ISL9305_DCD1_BLD    0x04
#define ISL9305_DCD2_MODE   0x02
#define ISL9305_DCD1_MODE   0x01

/*
 * SYSTEM_PARAMETER
 */
#define ISL9305_I2C_EN      0x40
#define ISL9305_DCDPOR_MASK 0x30
#define ISL9305_LDO2_EN     0x08
#define ISL9305_LDO1_EN     0x04
#define ISL9305_DCD2_EN     0x02
#define ISL9305_DCD1_EN     0x01

/*
 * DCD_SRCTL
 */
#define ISL9305_DCD2SR_MASK 0xc0
#define ISL9305_DCD1SR_MASK 0x07

static const struct regulator_ops isl9305_ops = {
        .enable = regulator_enable_regmap,
        .disable = regulator_disable_regmap,
        .is_enabled = regulator_is_enabled_regmap,
        .list_voltage = regulator_list_voltage_linear,
        .get_voltage_sel = regulator_get_voltage_sel_regmap,
        .set_voltage_sel = regulator_set_voltage_sel_regmap,
};

static const struct regulator_desc isl9305_regulators[] = {
        [ISL9305_DCD1] = {
                .name =         "DCD1",
                .of_match =     of_match_ptr("dcd1"),
                .regulators_node = of_match_ptr("regulators"),
                .n_voltages =   0x70,
                .min_uV =       825000,
                .uV_step =      25000,
                .vsel_reg =     ISL9305_DCD1OUT,
                .vsel_mask =    0x7f,
                .enable_reg =   ISL9305_SYSTEM_PARAMETER,
                .enable_mask =  ISL9305_DCD1_EN,
                .supply_name =  "VINDCD1",
                .ops =          &isl9305_ops,
                .owner =        THIS_MODULE,
        },
        [ISL9305_DCD2] = {
                .name =         "DCD2",
                .of_match =     of_match_ptr("dcd2"),
                .regulators_node = of_match_ptr("regulators"),
                .n_voltages =   0x70,
                .min_uV =       825000,
                .uV_step =      25000,
                .vsel_reg =     ISL9305_DCD2OUT,
                .vsel_mask =    0x7f,
                .enable_reg =   ISL9305_SYSTEM_PARAMETER,
                .enable_mask =  ISL9305_DCD2_EN,
                .supply_name =  "VINDCD2",
                .ops =          &isl9305_ops,
                .owner =        THIS_MODULE,
        },
        [ISL9305_LDO1] = {
                .name =         "LDO1",
                .of_match =     of_match_ptr("ldo1"),
                .regulators_node = of_match_ptr("regulators"),
                .n_voltages =   0x37,
                .min_uV =       900000,
                .uV_step =      50000,
                .vsel_reg =     ISL9305_LDO1OUT,
                .vsel_mask =    0x3f,
                .enable_reg =   ISL9305_SYSTEM_PARAMETER,
                .enable_mask =  ISL9305_LDO1_EN,
                .supply_name =  "VINLDO1",
                .ops =          &isl9305_ops,
                .owner =        THIS_MODULE,
        },
        [ISL9305_LDO2] = {
                .name =         "LDO2",
                .of_match =     of_match_ptr("ldo2"),
                .regulators_node = of_match_ptr("regulators"),
                .n_voltages =   0x37,
                .min_uV =       900000,
                .uV_step =      50000,
                .vsel_reg =     ISL9305_LDO2OUT,
                .vsel_mask =    0x3f,
                .enable_reg =   ISL9305_SYSTEM_PARAMETER,
                .enable_mask =  ISL9305_LDO2_EN,
                .supply_name =  "VINLDO2",
                .ops =          &isl9305_ops,
                .owner =        THIS_MODULE,
        },
};

static const struct regmap_config isl9305_regmap = {
        .reg_bits = 8,
        .val_bits = 8,

        .max_register = ISL9305_MAX_REG,
        .cache_type = REGCACHE_MAPLE,
};

static int isl9305_i2c_probe(struct i2c_client *i2c)
{
        struct regulator_config config = { };
        struct isl9305_pdata *pdata = i2c->dev.platform_data;
        struct regulator_dev *rdev;
        struct regmap *regmap;
        int i, ret;

        regmap = devm_regmap_init_i2c(i2c, &isl9305_regmap);
        if (IS_ERR(regmap)) {
                ret = PTR_ERR(regmap);
                dev_err(&i2c->dev, "Failed to create regmap: %d\n", ret);
                return ret;
        }

        config.dev = &i2c->dev;

        for (i = 0; i < ARRAY_SIZE(isl9305_regulators); i++) {
                if (pdata)
                        config.init_data = pdata->init_data[i];
                else
                        config.init_data = NULL;

                rdev = devm_regulator_register(&i2c->dev,
                                               &isl9305_regulators[i],
                                               &config);
                if (IS_ERR(rdev)) {
                        ret = PTR_ERR(rdev);
                        dev_err(&i2c->dev, "Failed to register %s: %d\n",
                                isl9305_regulators[i].name, ret);
                        return ret;
                }
        }

        return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id isl9305_dt_ids[] = {
        { .compatible = "isl,isl9305" }, /* for backward compat., don't use */
        { .compatible = "isil,isl9305" },
        { .compatible = "isl,isl9305h" }, /* for backward compat., don't use */
        { .compatible = "isil,isl9305h" },
        {},
};
MODULE_DEVICE_TABLE(of, isl9305_dt_ids);
#endif

static const struct i2c_device_id isl9305_i2c_id[] = {
        { "isl9305", },
        { "isl9305h", },
        { }
};
MODULE_DEVICE_TABLE(i2c, isl9305_i2c_id);

static struct i2c_driver isl9305_regulator_driver = {
        .driver = {
                .name = "isl9305",
                .probe_type = PROBE_PREFER_ASYNCHRONOUS,
                .of_match_table = of_match_ptr(isl9305_dt_ids),
        },
        .probe = isl9305_i2c_probe,
        .id_table = isl9305_i2c_id,
};

module_i2c_driver(isl9305_regulator_driver);

MODULE_AUTHOR("Mark Brown");
MODULE_DESCRIPTION("Intersil ISL9305 DCDC regulator");
MODULE_LICENSE("GPL");