#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
enum {
RTQ6752_IDX_PAVDD = 0,
RTQ6752_IDX_NAVDD = 1,
RTQ6752_IDX_MAX
};
#define RTQ6752_REG_PAVDD 0x00
#define RTQ6752_REG_NAVDD 0x01
#define RTQ6752_REG_PAVDDONDLY 0x07
#define RTQ6752_REG_PAVDDSSTIME 0x08
#define RTQ6752_REG_NAVDDONDLY 0x0D
#define RTQ6752_REG_NAVDDSSTIME 0x0E
#define RTQ6752_REG_OPTION1 0x12
#define RTQ6752_REG_CHSWITCH 0x16
#define RTQ6752_REG_FAULT 0x1D
#define RTQ6752_VOUT_MASK GENMASK(5, 0)
#define RTQ6752_NAVDDEN_MASK BIT(3)
#define RTQ6752_PAVDDEN_MASK BIT(0)
#define RTQ6752_PAVDDAD_MASK BIT(4)
#define RTQ6752_NAVDDAD_MASK BIT(3)
#define RTQ6752_PAVDDF_MASK BIT(3)
#define RTQ6752_NAVDDF_MASK BIT(0)
#define RTQ6752_ENABLE_MASK (BIT(RTQ6752_IDX_MAX) - 1)
#define RTQ6752_VOUT_MINUV 5000000
#define RTQ6752_VOUT_STEPUV 50000
#define RTQ6752_VOUT_NUM 47
#define RTQ6752_I2CRDY_TIMEUS 1000
#define RTQ6752_MINSS_TIMEUS 5000
struct rtq6752_priv {
struct regmap *regmap;
struct gpio_desc *enable_gpio;
struct mutex lock;
unsigned char enable_flag;
};
static int rtq6752_set_vdd_enable(struct regulator_dev *rdev)
{
struct rtq6752_priv *priv = rdev_get_drvdata(rdev);
int rid = rdev_get_id(rdev), ret;
mutex_lock(&priv->lock);
if (!priv->enable_flag) {
if (priv->enable_gpio) {
gpiod_set_value(priv->enable_gpio, 1);
usleep_range(RTQ6752_I2CRDY_TIMEUS,
RTQ6752_I2CRDY_TIMEUS + 100);
}
regcache_cache_only(priv->regmap, false);
ret = regcache_sync(priv->regmap);
if (ret) {
mutex_unlock(&priv->lock);
return ret;
}
}
priv->enable_flag |= BIT(rid);
mutex_unlock(&priv->lock);
return regulator_enable_regmap(rdev);
}
static int rtq6752_set_vdd_disable(struct regulator_dev *rdev)
{
struct rtq6752_priv *priv = rdev_get_drvdata(rdev);
int rid = rdev_get_id(rdev), ret;
ret = regulator_disable_regmap(rdev);
if (ret)
return ret;
mutex_lock(&priv->lock);
priv->enable_flag &= ~BIT(rid);
if (!priv->enable_flag) {
regcache_cache_only(priv->regmap, true);
regcache_mark_dirty(priv->regmap);
if (priv->enable_gpio)
gpiod_set_value(priv->enable_gpio, 0);
}
mutex_unlock(&priv->lock);
return 0;
}
static int rtq6752_get_error_flags(struct regulator_dev *rdev,
unsigned int *flags)
{
unsigned int val, events = 0;
static const unsigned int fault_mask[] = {
RTQ6752_PAVDDF_MASK, RTQ6752_NAVDDF_MASK };
int rid = rdev_get_id(rdev), ret;
ret = regmap_read(rdev->regmap, RTQ6752_REG_FAULT, &val);
if (ret)
return ret;
if (val & fault_mask[rid])
events = REGULATOR_ERROR_REGULATION_OUT;
*flags = events;
return 0;
}
static const struct regulator_ops rtq6752_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 = rtq6752_set_vdd_enable,
.disable = rtq6752_set_vdd_disable,
.is_enabled = regulator_is_enabled_regmap,
.set_active_discharge = regulator_set_active_discharge_regmap,
.get_error_flags = rtq6752_get_error_flags,
};
static const struct regulator_desc rtq6752_regulator_descs[] = {
{
.name = "rtq6752-pavdd",
.of_match = of_match_ptr("pavdd"),
.regulators_node = of_match_ptr("regulators"),
.id = RTQ6752_IDX_PAVDD,
.n_voltages = RTQ6752_VOUT_NUM,
.ops = &rtq6752_regulator_ops,
.owner = THIS_MODULE,
.min_uV = RTQ6752_VOUT_MINUV,
.uV_step = RTQ6752_VOUT_STEPUV,
.enable_time = RTQ6752_MINSS_TIMEUS,
.vsel_reg = RTQ6752_REG_PAVDD,
.vsel_mask = RTQ6752_VOUT_MASK,
.enable_reg = RTQ6752_REG_CHSWITCH,
.enable_mask = RTQ6752_PAVDDEN_MASK,
.active_discharge_reg = RTQ6752_REG_OPTION1,
.active_discharge_mask = RTQ6752_PAVDDAD_MASK,
.active_discharge_off = RTQ6752_PAVDDAD_MASK,
},
{
.name = "rtq6752-navdd",
.of_match = of_match_ptr("navdd"),
.regulators_node = of_match_ptr("regulators"),
.id = RTQ6752_IDX_NAVDD,
.n_voltages = RTQ6752_VOUT_NUM,
.ops = &rtq6752_regulator_ops,
.owner = THIS_MODULE,
.min_uV = RTQ6752_VOUT_MINUV,
.uV_step = RTQ6752_VOUT_STEPUV,
.enable_time = RTQ6752_MINSS_TIMEUS,
.vsel_reg = RTQ6752_REG_NAVDD,
.vsel_mask = RTQ6752_VOUT_MASK,
.enable_reg = RTQ6752_REG_CHSWITCH,
.enable_mask = RTQ6752_NAVDDEN_MASK,
.active_discharge_reg = RTQ6752_REG_OPTION1,
.active_discharge_mask = RTQ6752_NAVDDAD_MASK,
.active_discharge_off = RTQ6752_NAVDDAD_MASK,
}
};
static int rtq6752_init_device_properties(struct rtq6752_priv *priv)
{
u8 raw_vals[] = { 0, 0 };
int ret;
ret = regmap_raw_write(priv->regmap, RTQ6752_REG_PAVDDONDLY, raw_vals,
ARRAY_SIZE(raw_vals));
if (ret)
return ret;
return regmap_raw_write(priv->regmap, RTQ6752_REG_NAVDDONDLY, raw_vals,
ARRAY_SIZE(raw_vals));
}
static bool rtq6752_is_volatile_reg(struct device *dev, unsigned int reg)
{
if (reg == RTQ6752_REG_FAULT)
return true;
return false;
}
static const struct reg_default rtq6752_reg_defaults[] = {
{ RTQ6752_REG_PAVDD, 0x14 },
{ RTQ6752_REG_NAVDD, 0x14 },
{ RTQ6752_REG_PAVDDONDLY, 0x01 },
{ RTQ6752_REG_PAVDDSSTIME, 0x01 },
{ RTQ6752_REG_NAVDDONDLY, 0x01 },
{ RTQ6752_REG_NAVDDSSTIME, 0x01 },
{ RTQ6752_REG_OPTION1, 0x07 },
{ RTQ6752_REG_CHSWITCH, 0x29 },
};
static const struct regmap_config rtq6752_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.cache_type = REGCACHE_MAPLE,
.max_register = RTQ6752_REG_FAULT,
.reg_defaults = rtq6752_reg_defaults,
.num_reg_defaults = ARRAY_SIZE(rtq6752_reg_defaults),
.volatile_reg = rtq6752_is_volatile_reg,
};
static int rtq6752_probe(struct i2c_client *i2c)
{
struct rtq6752_priv *priv;
struct regulator_config reg_cfg = {};
struct regulator_dev *rdev;
int i, ret;
priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
mutex_init(&priv->lock);
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);
}
usleep_range(RTQ6752_I2CRDY_TIMEUS, RTQ6752_I2CRDY_TIMEUS + 100);
priv->enable_flag = RTQ6752_ENABLE_MASK;
priv->regmap = devm_regmap_init_i2c(i2c, &rtq6752_regmap_config);
if (IS_ERR(priv->regmap)) {
dev_err(&i2c->dev, "Failed to init regmap\n");
return PTR_ERR(priv->regmap);
}
ret = rtq6752_init_device_properties(priv);
if (ret) {
dev_err(&i2c->dev, "Failed to init device properties\n");
return ret;
}
reg_cfg.dev = &i2c->dev;
reg_cfg.regmap = priv->regmap;
reg_cfg.driver_data = priv;
for (i = 0; i < ARRAY_SIZE(rtq6752_regulator_descs); i++) {
rdev = devm_regulator_register(&i2c->dev,
rtq6752_regulator_descs + i,
®_cfg);
if (IS_ERR(rdev)) {
dev_err(&i2c->dev, "Failed to init %d regulator\n", i);
return PTR_ERR(rdev);
}
}
return 0;
}
static const struct of_device_id __maybe_unused rtq6752_device_table[] = {
{ .compatible = "richtek,rtq6752", },
{}
};
MODULE_DEVICE_TABLE(of, rtq6752_device_table);
static struct i2c_driver rtq6752_driver = {
.driver = {
.name = "rtq6752",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = rtq6752_device_table,
},
.probe = rtq6752_probe,
};
module_i2c_driver(rtq6752_driver);
MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
MODULE_DESCRIPTION("Richtek RTQ6752 Regulator Driver");
MODULE_LICENSE("GPL v2");
