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linux/drivers/regulator/rt5739.c
ChiYuan Huang 4536f3b93a
regulator: Add support for Richtek RT5739 voltage regulator 
The RT5739 is a step-down switching voltage regulator that supports
output voltage ragne from 300mV to 1300mV with the wide input supply
voltage range from 2.5V to 5.5V.

Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Link: https://lore.kernel.org/r/1676599618-24819-3-git-send-email-cy_huang@richtek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2023-03-05 23:38:55 +00:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Device driver for RT5739 regulator
*
* Copyright (C) 2023 Richtek Technology Corp.
*
* Author: ChiYuan Huang <cy_huang@richtek.com>
*/
#include <linux/bits.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#define RT5739_AUTO_MODE 0
#define RT5739_FPWM_MODE 1
#define RT5739_REG_NSEL0 0x00
#define RT5739_REG_NSEL1 0x01
#define RT5739_REG_CNTL1 0x02
#define RT5739_REG_ID1 0x03
#define RT5739_REG_CNTL2 0x06
#define RT5739_REG_CNTL4 0x08
#define RT5739_VSEL_MASK GENMASK(7, 0)
#define RT5739_MODEVSEL1_MASK BIT(1)
#define RT5739_MODEVSEL0_MASK BIT(0)
#define RT5739_VID_MASK GENMASK(7, 5)
#define RT5739_ACTD_MASK BIT(7)
#define RT5739_ENVSEL1_MASK BIT(1)
#define RT5739_ENVSEL0_MASK BIT(0)
#define RT5739_VOLT_MINUV 300000
#define RT5739_VOLT_MAXUV 1300000
#define RT5739_VOLT_STPUV 5000
#define RT5739_N_VOLTS 201
#define RT5739_I2CRDY_TIMEUS 1000
static int rt5739_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
const struct regulator_desc *desc = rdev->desc;
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int mask, val;
if (desc->vsel_reg == RT5739_REG_NSEL0)
mask = RT5739_MODEVSEL0_MASK;
else
mask = RT5739_MODEVSEL1_MASK;
switch (mode) {
case REGULATOR_MODE_FAST:
val = mask;
break;
case REGULATOR_MODE_NORMAL:
val = 0;
break;
default:
return -EINVAL;
}
return regmap_update_bits(regmap, RT5739_REG_CNTL1, mask, val);
}
static unsigned int rt5739_get_mode(struct regulator_dev *rdev)
{
const struct regulator_desc *desc = rdev->desc;
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int mask, val;
int ret;
if (desc->vsel_reg == RT5739_REG_NSEL0)
mask = RT5739_MODEVSEL0_MASK;
else
mask = RT5739_MODEVSEL1_MASK;
ret = regmap_read(regmap, RT5739_REG_CNTL1, &val);
if (ret)
return REGULATOR_MODE_INVALID;
if (val & mask)
return REGULATOR_MODE_FAST;
return REGULATOR_MODE_NORMAL;
}
static int rt5739_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 reg, vsel;
if (uV < RT5739_VOLT_MINUV || uV > RT5739_VOLT_MAXUV)
return -EINVAL;
if (desc->vsel_reg == RT5739_REG_NSEL0)
reg = RT5739_REG_NSEL1;
else
reg = RT5739_REG_NSEL0;
vsel = (uV - RT5739_VOLT_MINUV) / RT5739_VOLT_STPUV;
return regmap_write(regmap, reg, vsel);
}
static int rt5739_set_suspend_enable(struct regulator_dev *rdev)
{
const struct regulator_desc *desc = rdev->desc;
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int mask;
if (desc->vsel_reg == RT5739_REG_NSEL0)
mask = RT5739_ENVSEL1_MASK;
else
mask = RT5739_ENVSEL0_MASK;
return regmap_update_bits(regmap, desc->enable_reg, mask, mask);
}
static int rt5739_set_suspend_disable(struct regulator_dev *rdev)
{
const struct regulator_desc *desc = rdev->desc;
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int mask;
if (desc->vsel_reg == RT5739_REG_NSEL0)
mask = RT5739_ENVSEL1_MASK;
else
mask = RT5739_ENVSEL0_MASK;
return regmap_update_bits(regmap, desc->enable_reg, mask, 0);
}
static int rt5739_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 mask, val;
if (desc->vsel_reg == RT5739_REG_NSEL0)
mask = RT5739_MODEVSEL1_MASK;
else
mask = RT5739_MODEVSEL0_MASK;
switch (mode) {
case REGULATOR_MODE_FAST:
val = mask;
break;
case REGULATOR_MODE_NORMAL:
val = 0;
break;
default:
return -EINVAL;
}
return regmap_update_bits(regmap, RT5739_REG_CNTL1, mask, val);
}
static const struct regulator_ops rt5739_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_active_discharge = regulator_set_active_discharge_regmap,
.set_mode = rt5739_set_mode,
.get_mode = rt5739_get_mode,
.set_suspend_voltage = rt5739_set_suspend_voltage,
.set_suspend_enable = rt5739_set_suspend_enable,
.set_suspend_disable = rt5739_set_suspend_disable,
.set_suspend_mode = rt5739_set_suspend_mode,
};
static unsigned int rt5739_of_map_mode(unsigned int mode)
{
switch (mode) {
case RT5739_AUTO_MODE:
return REGULATOR_MODE_NORMAL;
case RT5739_FPWM_MODE:
return REGULATOR_MODE_FAST;
default:
return REGULATOR_MODE_INVALID;
}
}
static void rt5739_init_regulator_desc(struct regulator_desc *desc,
bool vsel_active_high)
{
/* Fixed */
desc->name = "rt5739-regulator";
desc->owner = THIS_MODULE;
desc->ops = &rt5739_regulator_ops;
desc->n_voltages = RT5739_N_VOLTS;
desc->min_uV = RT5739_VOLT_MINUV;
desc->uV_step = RT5739_VOLT_STPUV;
desc->vsel_mask = RT5739_VSEL_MASK;
desc->enable_reg = RT5739_REG_CNTL2;
desc->active_discharge_reg = RT5739_REG_CNTL1;
desc->active_discharge_mask = RT5739_ACTD_MASK;
desc->active_discharge_on = RT5739_ACTD_MASK;
desc->of_map_mode = rt5739_of_map_mode;
/* Assigned by vsel level */
if (vsel_active_high) {
desc->vsel_reg = RT5739_REG_NSEL1;
desc->enable_mask = RT5739_ENVSEL1_MASK;
} else {
desc->vsel_reg = RT5739_REG_NSEL0;
desc->enable_mask = RT5739_ENVSEL0_MASK;
}
}
static const struct regmap_config rt5739_regmap_config = {
.name = "rt5739",
.reg_bits = 8,
.val_bits = 8,
.max_register = RT5739_REG_CNTL4,
};
static int rt5739_probe(struct i2c_client *i2c)
{
struct device *dev = &i2c->dev;
struct regulator_desc *desc;
struct regmap *regmap;
struct gpio_desc *enable_gpio;
struct regulator_config cfg = {};
struct regulator_dev *rdev;
bool vsel_acth;
unsigned int vid;
int ret;
desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
if (!desc)
return -ENOMEM;
enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
if (IS_ERR(enable_gpio))
return dev_err_probe(dev, PTR_ERR(enable_gpio), "Failed to get 'enable' gpio\n");
else if (enable_gpio)
usleep_range(RT5739_I2CRDY_TIMEUS, RT5739_I2CRDY_TIMEUS + 1000);
regmap = devm_regmap_init_i2c(i2c, &rt5739_regmap_config);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n");
ret = regmap_read(regmap, RT5739_REG_ID1, &vid);
if (ret)
return dev_err_probe(dev, ret, "Failed to read VID\n");
/* RT5739: (VID & MASK) must be 0 */
if (vid & RT5739_VID_MASK)
return dev_err_probe(dev, -ENODEV, "Incorrect VID (0x%02x)\n", vid);
vsel_acth = device_property_read_bool(dev, "richtek,vsel-active-high");
rt5739_init_regulator_desc(desc, vsel_acth);
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 rt5739_device_table[] = {
{ .compatible = "richtek,rt5739" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, rt5739_device_table);
static struct i2c_driver rt5739_driver = {
.driver = {
.name = "rt5739",
.of_match_table = rt5739_device_table,
},
.probe_new = rt5739_probe,
};
module_i2c_driver(rt5739_driver);
MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
MODULE_DESCRIPTION("Richtek RT5739 regulator driver");
MODULE_LICENSE("GPL");
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