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// SPDX-License-Identifier: GPL-2.0+
//
// Copyright (c) 2025 Richtek Technology Corp.
//
// Author: ChiYuan Huang <cy_huang@richtek.com>
#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#define RT8092_REG_MNTRPT 0x00
#define RT8092_REG_VOUTH 0x10
#define RT8092_REG_VOUTL 0x11
#define RT8092_REG_PWMMODE 0x14
#define RT8092_REG_EVENT 0x18
#define RT8092_REG_VBANKH 0x1C
#define RT8092_REG_VBANKL 0x1D
#define RT8092_REG_VBOUND 0x1E
#define RT8092_TSDEVT_MASK BIT(7)
#define RT8092_PGEVT_MASK BIT(0)
#define RT8092_VSEL_MASK GENMASK(6, 0)
#define RT8092_VOUTEN_MASK BIT(7)
#define RT8092_FPWML_MASK BIT(7)
#define RT8092_FPWMH_MASK BIT(6)
#define RT8092_OCPEVT_MASK BIT(7)
#define RT8092_SCPEVT_MASK BIT(4)
#define RT8092_VINUVEVT_MASK BIT(1)
#define RT8092_VBANK_MASK GENMASK(1, 0)
#define RT8092_MODE_AUTO 0
#define RT8092_MODE_FPWM 1
#define RT8092_VOUT_BASEUV 303125
#define RT8092_VOUT_STEPUV 3125
#define RT8092_VOUT_MINSEL 15
#define RT8092_NUM_VOLTS 128
#define RT8092_INITSS_US 400
static int rt8092_get_vbank_index(struct regmap *regmap, bool vsel_high, unsigned int *vbank_idx)
{
unsigned int vbank_reg = vsel_high ? RT8092_REG_VBANKH : RT8092_REG_VBANKL;
unsigned int index;
int ret;
ret = regmap_read(regmap, vbank_reg, &index);
if (ret)
return ret;
*vbank_idx = FIELD_GET(RT8092_VBANK_MASK, index);
return 0;
}
static int rt8092_set_operating_mode(struct regulator_dev *rdev, unsigned int mode)
{
const struct regulator_desc *desc = rdev->desc;
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int mode_mask, mode_val;
mode_mask = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_FPWMH_MASK : RT8092_FPWML_MASK;
switch (mode) {
case REGULATOR_MODE_FAST:
mode_val = mode_mask;
break;
case REGULATOR_MODE_NORMAL:
mode_val = 0;
break;
default:
return -EINVAL;
}
return regmap_update_bits(regmap, RT8092_REG_PWMMODE, mode_mask, mode_val);
}
static unsigned int rt8092_get_operating_mode(struct regulator_dev *rdev)
{
const struct regulator_desc *desc = rdev->desc;
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int mode_mask, mode_val;
int ret;
mode_mask = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_FPWMH_MASK : RT8092_FPWML_MASK;
ret = regmap_read(regmap, RT8092_REG_PWMMODE, &mode_val);
if (ret)
return REGULATOR_MODE_INVALID;
return mode_val & mode_mask ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
}
static int rt8092_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
{
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int mntrpt, evtrpt, events = 0;
int ret;
ret = regmap_read(regmap, RT8092_REG_MNTRPT, &mntrpt);
if (ret)
return ret;
ret = regmap_read(regmap, RT8092_REG_EVENT, &evtrpt);
if (ret)
return ret;
if (!(mntrpt & RT8092_PGEVT_MASK) || evtrpt & RT8092_VINUVEVT_MASK)
events |= REGULATOR_ERROR_UNDER_VOLTAGE;
if (mntrpt & RT8092_TSDEVT_MASK)
events |= REGULATOR_ERROR_OVER_TEMP;
if (evtrpt & RT8092_OCPEVT_MASK)
events |= REGULATOR_ERROR_OVER_CURRENT;
if (evtrpt & RT8092_SCPEVT_MASK)
events |= REGULATOR_ERROR_FAIL;
*flags = events;
return 0;
}
static int rt8092_set_suspend_voltage(struct regulator_dev *rdev, int uV)
{
const struct regulator_desc *desc = rdev->desc;
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int vsel_reg, vsel_val, vbank_idx;
bool vsel_high;
int ret;
vsel_reg = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_REG_VOUTL : RT8092_REG_VOUTH;
vsel_high = desc->vsel_reg == RT8092_REG_VOUTH;
ret = rt8092_get_vbank_index(regmap, vsel_high, &vbank_idx);
if (ret)
return ret;
/* VOUT = (BASEUV + STEPUV * VSEL) * 2^vbank_idx */
uV >>= vbank_idx;
if (uV < RT8092_VOUT_BASEUV)
return -EINVAL;
vsel_val = (uV - RT8092_VOUT_BASEUV) / RT8092_VOUT_STEPUV;
if (vsel_val < RT8092_VOUT_MINSEL || vsel_val >= RT8092_NUM_VOLTS)
return -EINVAL;
return regmap_update_bits(regmap, vsel_reg, RT8092_VSEL_MASK, vsel_val);
}
static int rt8092_set_suspend_enable(struct regulator_dev *rdev)
{
const struct regulator_desc *desc = rdev->desc;
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int enable_reg;
enable_reg = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_REG_VOUTL : RT8092_REG_VOUTH;
return regmap_set_bits(regmap, enable_reg, RT8092_VOUTEN_MASK);
}
static int rt8092_set_suspend_disable(struct regulator_dev *rdev)
{
const struct regulator_desc *desc = rdev->desc;
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int enable_reg;
enable_reg = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_REG_VOUTL : RT8092_REG_VOUTH;
return regmap_clear_bits(regmap, enable_reg, RT8092_VOUTEN_MASK);
}
static int rt8092_set_suspend_mode(struct regulator_dev *rdev, unsigned int mode)
{
const struct regulator_desc *desc = rdev->desc;
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int mode_mask, mode_val;
mode_mask = desc->vsel_reg == RT8092_REG_VOUTH ? RT8092_FPWML_MASK : RT8092_FPWMH_MASK;
switch (mode) {
case REGULATOR_MODE_FAST:
mode_val = mode_mask;
break;
case REGULATOR_MODE_NORMAL:
mode_val = 0;
break;
default:
return -EINVAL;
}
return regmap_update_bits(regmap, RT8092_REG_PWMMODE, mode_mask, mode_val);
}
static const struct regulator_ops rt8092_regulator_ops = {
.list_voltage = regulator_list_voltage_linear,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_mode = rt8092_set_operating_mode,
.get_mode = rt8092_get_operating_mode,
.get_error_flags = rt8092_get_error_flags,
.set_suspend_voltage = rt8092_set_suspend_voltage,
.set_suspend_enable = rt8092_set_suspend_enable,
.set_suspend_disable = rt8092_set_suspend_disable,
.set_suspend_mode = rt8092_set_suspend_mode,
};
static unsigned int rt8092_of_map_mode(unsigned int mode)
{
switch (mode) {
case RT8092_MODE_AUTO:
return REGULATOR_MODE_NORMAL;
case RT8092_MODE_FPWM:
return REGULATOR_MODE_FAST;
default:
return REGULATOR_MODE_INVALID;
}
}
static const struct regmap_config rt8092_regmap_cfg = {
.name = "rt8092",
.reg_bits = 8,
.val_bits = 8,
.max_register = RT8092_REG_VBOUND,
};
static int rt8092_probe(struct i2c_client *i2c)
{
unsigned int vbank_idx, min_uV, step_uV;
struct regulator_config cfg = {};
struct device *dev = &i2c->dev;
struct regulator_desc *desc;
struct regulator_dev *rdev;
struct gpio_desc *enable;
struct regmap *regmap;
bool vsel_high;
int ret;
desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
if (!desc)
return -ENOMEM;
enable = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
if (IS_ERR(enable))
return dev_err_probe(dev, PTR_ERR(enable), "Failed get 'enable' gpio\n");
regmap = devm_regmap_init_i2c(i2c, &rt8092_regmap_cfg);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n");
vsel_high = device_property_read_bool(dev, "richtek,vsel-active-high");
ret = rt8092_get_vbank_index(regmap, vsel_high, &vbank_idx);
if (ret)
return dev_err_probe(dev, ret, "Failed to get VOUT bank index\n");
/*
* step VOUT = STEP_UV * 2^vbank_idx
* min VOUT = (BASEUV + STEPUV * VMIN_SEL) * 2^vbank_idx
*/
step_uV = RT8092_VOUT_STEPUV << vbank_idx;
min_uV = (RT8092_VOUT_BASEUV + RT8092_VOUT_STEPUV * RT8092_VOUT_MINSEL) << vbank_idx;
desc->name = "rt8092";
desc->owner = THIS_MODULE;
desc->type = REGULATOR_VOLTAGE;
desc->ops = &rt8092_regulator_ops;
desc->n_voltages = RT8092_NUM_VOLTS;
desc->min_uV = min_uV;
desc->uV_step = step_uV;
desc->linear_min_sel = RT8092_VOUT_MINSEL;
desc->enable_reg = desc->vsel_reg = vsel_high ? RT8092_REG_VOUTH : RT8092_REG_VOUTL;
desc->vsel_mask = RT8092_VSEL_MASK;
desc->enable_mask = RT8092_VOUTEN_MASK;
desc->enable_time = RT8092_INITSS_US;
desc->of_map_mode = rt8092_of_map_mode;
cfg.dev = dev;
cfg.of_node = dev_of_node(dev);
cfg.init_data = of_get_regulator_init_data(dev, dev_of_node(dev), desc);
rdev = devm_regulator_register(dev, desc, &cfg);
if (IS_ERR(rdev))
return dev_err_probe(dev, PTR_ERR(rdev), "Failed to register regulator\n");
return 0;
}
static const struct of_device_id rt8092_device_tables[] = {
{ .compatible = "richtek,rt8092" },
{}
};
MODULE_DEVICE_TABLE(of, rt8092_device_tables);
static struct i2c_driver rt8092_driver = {
.driver = {
.name = "rt8092",
.of_match_table = rt8092_device_tables,
},
.probe = rt8092_probe,
};
module_i2c_driver(rt8092_driver);
MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
MODULE_DESCRIPTION("Richtek RT8092 Regulator Driver");
MODULE_LICENSE("GPL");
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