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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2023 Richtek Technology Corp.
*
* Author: ChiYuan Huang <cy_huang@richtek.com>
*/
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#define RT4803_AUTO_MODE 1
#define RT4803_FPWM_MODE 2
#define RT4803_REG_CONFIG 0x01
#define RT4803_REG_VSELL 0x02
#define RT4803_REG_VSELH 0x03
#define RT4803_REG_ILIM 0x04
#define RT4803_REG_STAT 0x05
#define RT4803_MODE_MASK GENMASK(1, 0)
#define RT4803_VSEL_MASK GENMASK(4, 0)
#define RT4803_ILIM_MASK GENMASK(3, 0)
#define RT4803_TSD_MASK BIT(7)
#define RT4803_HOTDIE_MASK BIT(6)
#define RT4803_FAULT_MASK BIT(1)
#define RT4803_PGOOD_MASK BIT(0)
#define RT4803_VOUT_MINUV 2850000
#define RT4803_VOUT_STEPUV 50000
#define RT4803_VOUT_NUM 32
static int rt4803_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int modeval;
switch (mode) {
case REGULATOR_MODE_NORMAL:
modeval = RT4803_AUTO_MODE;
break;
case REGULATOR_MODE_FAST:
modeval = RT4803_FPWM_MODE;
break;
default:
return -EINVAL;
}
modeval <<= ffs(RT4803_MODE_MASK) - 1;
return regmap_update_bits(regmap, RT4803_REG_CONFIG, RT4803_MODE_MASK, modeval);
}
static unsigned int rt4803_get_mode(struct regulator_dev *rdev)
{
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int modeval;
int ret;
ret = regmap_read(regmap, RT4803_REG_CONFIG, &modeval);
if (ret)
return REGULATOR_MODE_INVALID;
modeval >>= ffs(RT4803_MODE_MASK) - 1;
switch (modeval) {
case RT4803_AUTO_MODE:
return REGULATOR_MODE_NORMAL;
case RT4803_FPWM_MODE:
return REGULATOR_MODE_FAST;
default:
return REGULATOR_MODE_INVALID;
}
}
static int rt4803_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
{
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int state, events = 0;
int ret;
ret = regmap_read(regmap, RT4803_REG_STAT, &state);
if (ret)
return ret;
if (state & RT4803_PGOOD_MASK)
goto out_error_flag;
if (state & RT4803_FAULT_MASK)
events |= REGULATOR_ERROR_FAIL;
if (state & RT4803_HOTDIE_MASK)
events |= REGULATOR_ERROR_OVER_TEMP_WARN;
if (state & RT4803_TSD_MASK)
events |= REGULATOR_ERROR_OVER_TEMP;
out_error_flag:
*flags = events;
return 0;
}
static int rt4803_set_suspend_voltage(struct regulator_dev *rdev, int uV)
{
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int reg, vsel;
if (rdev->desc->vsel_reg == RT4803_REG_VSELL)
reg = RT4803_REG_VSELH;
else
reg = RT4803_REG_VSELL;
vsel = (uV - rdev->desc->min_uV) / rdev->desc->uV_step;
vsel <<= ffs(RT4803_VSEL_MASK) - 1;
return regmap_update_bits(regmap, reg, RT4803_VSEL_MASK, vsel);
}
static const struct regulator_ops rt4803_regulator_ops = {
.list_voltage = regulator_list_voltage_linear,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_mode = rt4803_set_mode,
.get_mode = rt4803_get_mode,
.get_error_flags = rt4803_get_error_flags,
.set_suspend_voltage = rt4803_set_suspend_voltage,
};
static unsigned int rt4803_of_map_mode(unsigned int mode)
{
switch (mode) {
case RT4803_AUTO_MODE:
return REGULATOR_MODE_NORMAL;
case RT4803_FPWM_MODE:
return REGULATOR_MODE_FAST;
default:
return REGULATOR_MODE_INVALID;
}
}
static const struct regmap_config rt4803_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = RT4803_REG_STAT,
};
static int rt4803_probe(struct i2c_client *i2c)
{
struct device *dev = &i2c->dev;
struct regmap *regmap;
struct regulator_desc *desc;
struct regulator_config cfg = {};
struct regulator_dev *rdev;
bool vsel_act_high;
int ret;
desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
if (!desc)
return -ENOMEM;
regmap = devm_regmap_init_i2c(i2c, &rt4803_regmap_config);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n");
/* Always configure the input current limit to max 5A at initial */
ret = regmap_update_bits(regmap, RT4803_REG_ILIM, RT4803_ILIM_MASK, 0xff);
if (ret)
return dev_err_probe(dev, ret, "Failed to config ILIM to max\n");
vsel_act_high = device_property_read_bool(dev, "richtek,vsel-active-high");
desc->name = "rt4803-regulator";
desc->type = REGULATOR_VOLTAGE;
desc->owner = THIS_MODULE;
desc->ops = &rt4803_regulator_ops;
desc->min_uV = RT4803_VOUT_MINUV;
desc->uV_step = RT4803_VOUT_STEPUV;
desc->n_voltages = RT4803_VOUT_NUM;
desc->vsel_mask = RT4803_VSEL_MASK;
desc->of_map_mode = rt4803_of_map_mode;
if (vsel_act_high)
desc->vsel_reg = RT4803_REG_VSELH;
else
desc->vsel_reg = RT4803_REG_VSELL;
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);
return PTR_ERR_OR_ZERO(rdev);
}
static const struct of_device_id rt4803_device_match_table[] = {
{ .compatible = "richtek,rt4803" },
{}
};
MODULE_DEVICE_TABLE(of, rt4803_device_match_table);
static struct i2c_driver rt4803_driver = {
.driver = {
.name = "rt4803",
.of_match_table = rt4803_device_match_table,
},
.probe = rt4803_probe,
};
module_i2c_driver(rt4803_driver);
MODULE_DESCRIPTION("Richtek RT4803 voltage regulator driver");
MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
MODULE_LICENSE("GPL");
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