// SPDX-License-Identifier: GPL-2.0-only
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/kernel.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 RT6160_MODE_AUTO 0
#define RT6160_MODE_FPWM 1
#define RT6160_REG_CNTL 0x01
#define RT6160_REG_STATUS 0x02
#define RT6160_REG_DEVID 0x03
#define RT6160_REG_VSELL 0x04
#define RT6160_REG_VSELH 0x05
#define RT6160_NUM_REGS (RT6160_REG_VSELH + 1)
#define RT6160_FPWM_MASK BIT(3)
#define RT6160_RAMPRATE_MASK GENMASK(1, 0)
#define RT6160_VID_MASK GENMASK(7, 4)
#define RT6160_VSEL_MASK GENMASK(6, 0)
#define RT6160_HDSTAT_MASK BIT(4)
#define RT6160_UVSTAT_MASK BIT(3)
#define RT6160_OCSTAT_MASK BIT(2)
#define RT6160_TSDSTAT_MASK BIT(1)
#define RT6160_PGSTAT_MASK BIT(0)
#define RT6160_VENDOR_ID 0xA0
#define RT6160_VOUT_MINUV 2025000
#define RT6160_VOUT_MAXUV 5200000
#define RT6160_VOUT_STPUV 25000
#define RT6160_N_VOUTS ((RT6160_VOUT_MAXUV - RT6160_VOUT_MINUV) / RT6160_VOUT_STPUV + 1)
#define RT6160_I2CRDY_TIMEUS 100
struct rt6160_priv {
struct regulator_desc desc;
struct gpio_desc *enable_gpio;
struct regmap *regmap;
bool enable_state;
};
static const unsigned int rt6160_ramp_tables[] = {
1000, 2500, 5000, 10000
};
static int rt6160_enable(struct regulator_dev *rdev)
{
struct rt6160_priv *priv = rdev_get_drvdata(rdev);
if (!priv->enable_gpio)
return 0;
gpiod_set_value_cansleep(priv->enable_gpio, 1);
priv->enable_state = true;
usleep_range(RT6160_I2CRDY_TIMEUS, RT6160_I2CRDY_TIMEUS + 100);
regcache_cache_only(priv->regmap, false);
return regcache_sync(priv->regmap);
}
static int rt6160_disable(struct regulator_dev *rdev)
{
struct rt6160_priv *priv = rdev_get_drvdata(rdev);
if (!priv->enable_gpio)
return -EINVAL;
/* Mark regcache as dirty and cache only before HW disabled */
regcache_cache_only(priv->regmap, true);
regcache_mark_dirty(priv->regmap);
priv->enable_state = false;
gpiod_set_value_cansleep(priv->enable_gpio, 0);
return 0;
}
static int rt6160_is_enabled(struct regulator_dev *rdev)
{
struct rt6160_priv *priv = rdev_get_drvdata(rdev);
return priv->enable_state ? 1 : 0;
}
static int rt6160_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int mode_val;
switch (mode) {
case REGULATOR_MODE_FAST:
mode_val = RT6160_FPWM_MASK;
break;
case REGULATOR_MODE_NORMAL:
mode_val = 0;
break;
default:
dev_err(&rdev->dev, "mode not supported\n");
return -EINVAL;
}
return regmap_update_bits(regmap, RT6160_REG_CNTL, RT6160_FPWM_MASK, mode_val);
}
static unsigned int rt6160_get_mode(struct regulator_dev *rdev)
{
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int val;
int ret;
ret = regmap_read(regmap, RT6160_REG_CNTL, &val);
if (ret)
return ret;
if (val & RT6160_FPWM_MASK)
return REGULATOR_MODE_FAST;
return REGULATOR_MODE_NORMAL;
}
static int rt6160_set_suspend_voltage(struct regulator_dev *rdev, int uV)
{
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int suspend_vsel_reg;
int vsel;
vsel = regulator_map_voltage_linear(rdev, uV, uV);
if (vsel < 0)
return vsel;
if (rdev->desc->vsel_reg == RT6160_REG_VSELL)
suspend_vsel_reg = RT6160_REG_VSELH;
else
suspend_vsel_reg = RT6160_REG_VSELL;
return regmap_update_bits(regmap, suspend_vsel_reg,
RT6160_VSEL_MASK, vsel);
}
static int rt6160_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
{
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int val, events = 0;
int ret;
ret = regmap_read(regmap, RT6160_REG_STATUS, &val);
if (ret)
return ret;
if (val & (RT6160_HDSTAT_MASK | RT6160_TSDSTAT_MASK))
events |= REGULATOR_ERROR_OVER_TEMP;
if (val & RT6160_UVSTAT_MASK)
events |= REGULATOR_ERROR_UNDER_VOLTAGE;
if (val & RT6160_OCSTAT_MASK)
events |= REGULATOR_ERROR_OVER_CURRENT;
if (val & RT6160_PGSTAT_MASK)
events |= REGULATOR_ERROR_FAIL;
*flags = events;
return 0;
}
static const struct regulator_ops rt6160_regulator_ops = {
.list_voltage = regulator_list_voltage_linear,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.enable = rt6160_enable,
.disable = rt6160_disable,
.is_enabled = rt6160_is_enabled,
.set_mode = rt6160_set_mode,
.get_mode = rt6160_get_mode,
.set_suspend_voltage = rt6160_set_suspend_voltage,
.set_ramp_delay = regulator_set_ramp_delay_regmap,
.get_error_flags = rt6160_get_error_flags,
};
static unsigned int rt6160_of_map_mode(unsigned int mode)
{
switch (mode) {
case RT6160_MODE_FPWM:
return REGULATOR_MODE_FAST;
case RT6160_MODE_AUTO:
return REGULATOR_MODE_NORMAL;
}
return REGULATOR_MODE_INVALID;
}
static bool rt6160_is_accessible_reg(struct device *dev, unsigned int reg)
{
if (reg >= RT6160_REG_CNTL && reg <= RT6160_REG_VSELH)
return true;
return false;
}
static bool rt6160_is_volatile_reg(struct device *dev, unsigned int reg)
{
if (reg == RT6160_REG_STATUS)
return true;
return false;
}
static const struct regmap_config rt6160_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = RT6160_REG_VSELH,
.num_reg_defaults_raw = RT6160_NUM_REGS,
.cache_type = REGCACHE_FLAT,
.writeable_reg = rt6160_is_accessible_reg,
.readable_reg = rt6160_is_accessible_reg,
.volatile_reg = rt6160_is_volatile_reg,
};
static int rt6160_probe(struct i2c_client *i2c)
{
struct rt6160_priv *priv;
struct regulator_config regulator_cfg = {};
struct regulator_dev *rdev;
bool vsel_active_low;
unsigned int devid;
int ret;
priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
vsel_active_low =
device_property_present(&i2c->dev, "richtek,vsel-active-low");
priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable", GPIOD_OUT_HIGH);
if (IS_ERR(priv->enable_gpio)) {
dev_err(&i2c->dev, "Failed to get 'enable' gpio\n");
return PTR_ERR(priv->enable_gpio);
}
priv->enable_state = true;
usleep_range(RT6160_I2CRDY_TIMEUS, RT6160_I2CRDY_TIMEUS + 100);
priv->regmap = devm_regmap_init_i2c(i2c, &rt6160_regmap_config);
if (IS_ERR(priv->regmap)) {
ret = PTR_ERR(priv->regmap);
dev_err(&i2c->dev, "Failed to init regmap (%d)\n", ret);
return ret;
}
ret = regmap_read(priv->regmap, RT6160_REG_DEVID, &devid);
if (ret)
return ret;
if ((devid & RT6160_VID_MASK) != RT6160_VENDOR_ID) {
dev_err(&i2c->dev, "VID not correct [0x%02x]\n", devid);
return -ENODEV;
}
priv->desc.name = "rt6160-buckboost";
priv->desc.type = REGULATOR_VOLTAGE;
priv->desc.owner = THIS_MODULE;
priv->desc.min_uV = RT6160_VOUT_MINUV;
priv->desc.uV_step = RT6160_VOUT_STPUV;
if (vsel_active_low)
priv->desc.vsel_reg = RT6160_REG_VSELL;
else
priv->desc.vsel_reg = RT6160_REG_VSELH;
priv->desc.vsel_mask = RT6160_VSEL_MASK;
priv->desc.n_voltages = RT6160_N_VOUTS;
priv->desc.ramp_reg = RT6160_REG_CNTL;
priv->desc.ramp_mask = RT6160_RAMPRATE_MASK;
priv->desc.ramp_delay_table = rt6160_ramp_tables;
priv->desc.n_ramp_values = ARRAY_SIZE(rt6160_ramp_tables);
priv->desc.of_map_mode = rt6160_of_map_mode;
priv->desc.ops = &rt6160_regulator_ops;
regulator_cfg.dev = &i2c->dev;
regulator_cfg.of_node = i2c->dev.of_node;
regulator_cfg.regmap = priv->regmap;
regulator_cfg.driver_data = priv;
regulator_cfg.init_data = of_get_regulator_init_data(&i2c->dev, i2c->dev.of_node,
&priv->desc);
rdev = devm_regulator_register(&i2c->dev, &priv->desc, ®ulator_cfg);
if (IS_ERR(rdev)) {
dev_err(&i2c->dev, "Failed to register regulator\n");
return PTR_ERR(rdev);
}
return 0;
}
static const struct of_device_id __maybe_unused rt6160_of_match_table[] = {
{ .compatible = "richtek,rt6160", },
{}
};
MODULE_DEVICE_TABLE(of, rt6160_of_match_table);
static struct i2c_driver rt6160_driver = {
.driver = {
.name = "rt6160",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = rt6160_of_match_table,
},
.probe = rt6160_probe,
};
module_i2c_driver(rt6160_driver);
MODULE_DESCRIPTION("Richtek RT6160 voltage regulator driver");
MODULE_AUTHOR("ChiYuan Huang <[email protected]>");
MODULE_LICENSE("GPL v2");
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