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// SPDX-License-Identifier: GPL-2.0-or-later
//
// regulator driver for Maxim MAX77838
//
// based on max77826-regulator.c
//
// Copyright (c) 2025, Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
enum max77838_registers {
MAX77838_REG_DEVICE_ID = 0x00,
MAX77838_REG_TOPSYS_STAT,
MAX77838_REG_STAT,
MAX77838_REG_EN,
MAX77838_REG_GPIO_PD_CTRL,
MAX77838_REG_UVLO_CFG1,
/* 0x06 - 0x0B: reserved */
MAX77838_REG_I2C_CFG = 0x0C,
/* 0x0D - 0x0F: reserved */
MAX77838_REG_LDO1_CFG = 0x10,
MAX77838_REG_LDO2_CFG,
MAX77838_REG_LDO3_CFG,
MAX77838_REG_LDO4_CFG,
/* 0x14 - 0x1F: reserved */
MAX77838_REG_BUCK_CFG1 = 0x20,
MAX77838_REG_BUCK_VOUT,
};
enum max77838_regulators {
MAX77838_LDO1 = 0,
MAX77838_LDO2,
MAX77838_LDO3,
MAX77838_LDO4,
MAX77838_BUCK,
MAX77838_MAX_REGULATORS,
};
#define MAX77838_MASK_LDO 0x7f
#define MAX77838_MASK_BUCK 0xff
#define MAX77838_LDO1_EN BIT(0)
#define MAX77838_LDO2_EN BIT(1)
#define MAX77838_LDO3_EN BIT(2)
#define MAX77838_LDO4_EN BIT(3)
#define MAX77838_BUCK_EN BIT(4)
#define MAX77838_BUCK_AD BIT(3)
#define MAX77838_LDO_AD BIT(7)
#define MAX77838_LDO_VOLT_MIN 600000
#define MAX77838_LDO_VOLT_MAX 3775000
#define MAX77838_LDO_VOLT_STEP 25000
#define MAX77838_BUCK_VOLT_MIN 500000
#define MAX77838_BUCK_VOLT_MAX 2093750
#define MAX77838_BUCK_VOLT_STEP 6250
#define MAX77838_VOLT_RANGE(_type) \
((MAX77838_ ## _type ## _VOLT_MAX - \
MAX77838_ ## _type ## _VOLT_MIN) / \
MAX77838_ ## _type ## _VOLT_STEP + 1)
#define MAX77838_LDO(_id) \
[MAX77838_LDO ## _id] = { \
.id = MAX77838_LDO ## _id, \
.name = "ldo"#_id, \
.of_match = of_match_ptr("ldo"#_id), \
.regulators_node = "regulators", \
.ops = &max77838_regulator_ops, \
.min_uV = MAX77838_LDO_VOLT_MIN, \
.uV_step = MAX77838_LDO_VOLT_STEP, \
.n_voltages = MAX77838_VOLT_RANGE(LDO), \
.enable_reg = MAX77838_REG_EN, \
.enable_mask = MAX77838_LDO ## _id ## _EN, \
.vsel_reg = MAX77838_REG_LDO ## _id ## _CFG, \
.vsel_mask = MAX77838_MASK_LDO, \
.active_discharge_off = 0, \
.active_discharge_on = MAX77838_LDO_AD, \
.active_discharge_mask = MAX77838_LDO_AD, \
.active_discharge_reg = MAX77838_REG_LDO ## _id ## _CFG, \
.owner = THIS_MODULE, \
}
#define MAX77838_BUCK_DESC \
[MAX77838_BUCK] = { \
.id = MAX77838_BUCK, \
.name = "buck", \
.of_match = of_match_ptr("buck"), \
.regulators_node = "regulators", \
.ops = &max77838_regulator_ops, \
.min_uV = MAX77838_BUCK_VOLT_MIN, \
.uV_step = MAX77838_BUCK_VOLT_STEP, \
.n_voltages = MAX77838_VOLT_RANGE(BUCK), \
.enable_reg = MAX77838_REG_EN, \
.enable_mask = MAX77838_BUCK_EN, \
.vsel_reg = MAX77838_REG_BUCK_VOUT, \
.vsel_mask = MAX77838_MASK_BUCK, \
.active_discharge_off = 0, \
.active_discharge_on = MAX77838_BUCK_AD, \
.active_discharge_mask = MAX77838_BUCK_AD, \
.active_discharge_reg = MAX77838_REG_BUCK_CFG1, \
.owner = THIS_MODULE, \
}
struct max77838_regulator_info {
struct regmap *regmap;
};
static const struct regmap_config max77838_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = MAX77838_REG_BUCK_VOUT,
};
static const struct regulator_ops max77838_regulator_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_active_discharge = regulator_set_active_discharge_regmap,
};
static const struct regulator_desc max77838_regulators_desc[] = {
MAX77838_LDO(1),
MAX77838_LDO(2),
MAX77838_LDO(3),
MAX77838_LDO(4),
MAX77838_BUCK_DESC,
};
static int max77838_read_device_id(struct regmap *regmap, struct device *dev)
{
unsigned int device_id;
int ret;
ret = regmap_read(regmap, MAX77838_REG_DEVICE_ID, &device_id);
if (!ret)
dev_dbg(dev, "DEVICE_ID: 0x%x\n", device_id);
return ret;
}
static int max77838_i2c_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct max77838_regulator_info *info;
struct regulator_config config = {};
struct regulator_dev *rdev;
struct regmap *regmap;
int i;
info = devm_kzalloc(dev, sizeof(struct max77838_regulator_info),
GFP_KERNEL);
if (!info)
return -ENOMEM;
regmap = devm_regmap_init_i2c(client, &max77838_regmap_config);
if (IS_ERR(regmap)) {
dev_err(dev, "Failed to allocate regmap!\n");
return PTR_ERR(regmap);
}
info->regmap = regmap;
i2c_set_clientdata(client, info);
config.dev = dev;
config.regmap = regmap;
config.driver_data = info;
for (i = 0; i < MAX77838_MAX_REGULATORS; i++) {
rdev = devm_regulator_register(dev,
&max77838_regulators_desc[i],
&config);
if (IS_ERR(rdev)) {
dev_err(dev, "Failed to register regulator!\n");
return PTR_ERR(rdev);
}
}
return max77838_read_device_id(regmap, dev);
}
static const struct of_device_id __maybe_unused max77838_of_match[] = {
{ .compatible = "maxim,max77838" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, max77838_of_match);
static const struct i2c_device_id max77838_id[] = {
{ "max77838-regulator" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, max77838_id);
static struct i2c_driver max77838_regulator_driver = {
.driver = {
.name = "max77838",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(max77838_of_match),
},
.probe = max77838_i2c_probe,
.id_table = max77838_id,
};
module_i2c_driver(max77838_regulator_driver);
MODULE_AUTHOR("Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>");
MODULE_DESCRIPTION("MAX77838 PMIC regulator driver");
MODULE_LICENSE("GPL");
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