#include <linux/bits.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#define RT5759_REG_VENDORINFO 0x00
#define RT5759_REG_FREQ 0x01
#define RT5759_REG_VSEL 0x02
#define RT5759_REG_DCDCCTRL 0x03
#define RT5759_REG_STATUS 0x04
#define RT5759_REG_DCDCSET 0x05
#define RT5759A_REG_WDTEN 0x42
#define RT5759_TSTEP_MASK GENMASK(3, 2)
#define RT5759_VSEL_MASK GENMASK(6, 0)
#define RT5759_DISCHARGE_MASK BIT(3)
#define RT5759_FPWM_MASK BIT(2)
#define RT5759_ENABLE_MASK BIT(1)
#define RT5759_OT_MASK BIT(1)
#define RT5759_UV_MASK BIT(0)
#define RT5957_OCLVL_MASK GENMASK(7, 6)
#define RT5759_OCLVL_SHIFT 6
#define RT5957_OTLVL_MASK GENMASK(5, 4)
#define RT5759_OTLVL_SHIFT 4
#define RT5759A_WDTEN_MASK BIT(1)
#define RT5759_MANUFACTURER_ID 0x82
#define RT5759_NUM_VOLTS 91
#define RT5759_MIN_UV 600000
#define RT5759_STEP_UV 10000
#define RT5759A_STEP_UV 12500
#define RT5759_MINSS_TIMEUS 1500
#define RT5759_PSKIP_MODE 0
#define RT5759_FPWM_MODE 1
enum {
CHIP_TYPE_RT5759 = 0,
CHIP_TYPE_RT5759A,
CHIP_TYPE_MAX
};
struct rt5759_priv {
struct device *dev;
struct regmap *regmap;
struct regulator_desc desc;
unsigned long chip_type;
};
static int rt5759_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_NORMAL:
mode_val = 0;
break;
case REGULATOR_MODE_FAST:
mode_val = RT5759_FPWM_MASK;
break;
default:
return -EINVAL;
}
return regmap_update_bits(regmap, RT5759_REG_STATUS, RT5759_FPWM_MASK,
mode_val);
}
static unsigned int rt5759_get_mode(struct regulator_dev *rdev)
{
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int regval;
int ret;
ret = regmap_read(regmap, RT5759_REG_DCDCCTRL, ®val);
if (ret)
return REGULATOR_MODE_INVALID;
if (regval & RT5759_FPWM_MASK)
return REGULATOR_MODE_FAST;
return REGULATOR_MODE_NORMAL;
}
static int rt5759_get_error_flags(struct regulator_dev *rdev,
unsigned int *flags)
{
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int status, events = 0;
int ret;
ret = regmap_read(regmap, RT5759_REG_STATUS, &status);
if (ret)
return ret;
if (status & RT5759_OT_MASK)
events |= REGULATOR_ERROR_OVER_TEMP;
if (status & RT5759_UV_MASK)
events |= REGULATOR_ERROR_UNDER_VOLTAGE;
*flags = events;
return 0;
}
static int rt5759_set_ocp(struct regulator_dev *rdev, int lim_uA, int severity,
bool enable)
{
struct regmap *regmap = rdev_get_regmap(rdev);
int ocp_lvl[] = { 9800000, 10800000, 11800000 };
unsigned int ocp_regval;
int i;
if (severity != REGULATOR_SEVERITY_PROT)
return 0;
if (enable) {
if (lim_uA == 0)
lim_uA = 10800000;
for (i = 0; i < ARRAY_SIZE(ocp_lvl); i++) {
if (lim_uA <= ocp_lvl[i])
break;
}
if (i == ARRAY_SIZE(ocp_lvl))
i = ARRAY_SIZE(ocp_lvl) - 1;
ocp_regval = i + 1;
} else
ocp_regval = 0;
return regmap_update_bits(regmap, RT5759_REG_DCDCSET, RT5957_OCLVL_MASK,
ocp_regval << RT5759_OCLVL_SHIFT);
}
static int rt5759_set_otp(struct regulator_dev *rdev, int lim, int severity,
bool enable)
{
struct regmap *regmap = rdev_get_regmap(rdev);
int otp_lvl[] = { 140, 150, 170 };
unsigned int otp_regval;
int i;
if (severity != REGULATOR_SEVERITY_PROT)
return 0;
if (enable) {
if (lim == 0)
lim = 150;
for (i = 0; i < ARRAY_SIZE(otp_lvl); i++) {
if (lim <= otp_lvl[i])
break;
}
if (i == ARRAY_SIZE(otp_lvl))
i = ARRAY_SIZE(otp_lvl) - 1;
otp_regval = i + 1;
} else
otp_regval = 0;
return regmap_update_bits(regmap, RT5759_REG_DCDCSET, RT5957_OTLVL_MASK,
otp_regval << RT5759_OTLVL_SHIFT);
}
static const struct regulator_ops rt5759_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 = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_active_discharge = regulator_set_active_discharge_regmap,
.set_mode = rt5759_set_mode,
.get_mode = rt5759_get_mode,
.set_ramp_delay = regulator_set_ramp_delay_regmap,
.get_error_flags = rt5759_get_error_flags,
.set_over_current_protection = rt5759_set_ocp,
.set_thermal_protection = rt5759_set_otp,
};
static unsigned int rt5759_of_map_mode(unsigned int mode)
{
switch (mode) {
case RT5759_FPWM_MODE:
return REGULATOR_MODE_FAST;
case RT5759_PSKIP_MODE:
return REGULATOR_MODE_NORMAL;
default:
return REGULATOR_MODE_INVALID;
}
}
static const unsigned int rt5759_ramp_table[] = { 20000, 15000, 10000, 5000 };
static int rt5759_regulator_register(struct rt5759_priv *priv)
{
struct device_node *np = priv->dev->of_node;
struct regulator_desc *reg_desc = &priv->desc;
struct regulator_config reg_cfg;
struct regulator_dev *rdev;
int ret;
reg_desc->name = "rt5759-buck";
reg_desc->type = REGULATOR_VOLTAGE;
reg_desc->owner = THIS_MODULE;
reg_desc->ops = &rt5759_regulator_ops;
reg_desc->n_voltages = RT5759_NUM_VOLTS;
reg_desc->min_uV = RT5759_MIN_UV;
reg_desc->uV_step = RT5759_STEP_UV;
reg_desc->vsel_reg = RT5759_REG_VSEL;
reg_desc->vsel_mask = RT5759_VSEL_MASK;
reg_desc->enable_reg = RT5759_REG_DCDCCTRL;
reg_desc->enable_mask = RT5759_ENABLE_MASK;
reg_desc->active_discharge_reg = RT5759_REG_DCDCCTRL;
reg_desc->active_discharge_mask = RT5759_DISCHARGE_MASK;
reg_desc->active_discharge_on = RT5759_DISCHARGE_MASK;
reg_desc->ramp_reg = RT5759_REG_FREQ;
reg_desc->ramp_mask = RT5759_TSTEP_MASK;
reg_desc->ramp_delay_table = rt5759_ramp_table;
reg_desc->n_ramp_values = ARRAY_SIZE(rt5759_ramp_table);
reg_desc->enable_time = RT5759_MINSS_TIMEUS;
reg_desc->of_map_mode = rt5759_of_map_mode;
if (priv->chip_type == CHIP_TYPE_RT5759A)
reg_desc->uV_step = RT5759A_STEP_UV;
memset(®_cfg, 0, sizeof(reg_cfg));
reg_cfg.dev = priv->dev;
reg_cfg.of_node = np;
reg_cfg.init_data = of_get_regulator_init_data(priv->dev, np, reg_desc);
reg_cfg.regmap = priv->regmap;
rdev = devm_regulator_register(priv->dev, reg_desc, ®_cfg);
if (IS_ERR(rdev)) {
ret = PTR_ERR(rdev);
dev_err(priv->dev, "Failed to register regulator (%d)\n", ret);
return ret;
}
return 0;
}
static int rt5759_init_device_property(struct rt5759_priv *priv)
{
unsigned int val = 0;
if (priv->chip_type != CHIP_TYPE_RT5759A)
return 0;
if (device_property_read_bool(priv->dev, "richtek,watchdog-enable"))
val = RT5759A_WDTEN_MASK;
return regmap_update_bits(priv->regmap, RT5759A_REG_WDTEN,
RT5759A_WDTEN_MASK, val);
}
static int rt5759_manufacturer_check(struct rt5759_priv *priv)
{
unsigned int vendor;
int ret;
ret = regmap_read(priv->regmap, RT5759_REG_VENDORINFO, &vendor);
if (ret)
return ret;
if (vendor != RT5759_MANUFACTURER_ID) {
dev_err(priv->dev, "vendor info not correct (%d)\n", vendor);
return -EINVAL;
}
return 0;
}
static bool rt5759_is_accessible_reg(struct device *dev, unsigned int reg)
{
struct rt5759_priv *priv = dev_get_drvdata(dev);
if (reg <= RT5759_REG_DCDCSET)
return true;
if (priv->chip_type == CHIP_TYPE_RT5759A && reg == RT5759A_REG_WDTEN)
return true;
return false;
}
static const struct regmap_config rt5759_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = RT5759A_REG_WDTEN,
.readable_reg = rt5759_is_accessible_reg,
.writeable_reg = rt5759_is_accessible_reg,
};
static int rt5759_probe(struct i2c_client *i2c)
{
struct rt5759_priv *priv;
int ret;
priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->dev = &i2c->dev;
priv->chip_type = (unsigned long)of_device_get_match_data(&i2c->dev);
i2c_set_clientdata(i2c, priv);
priv->regmap = devm_regmap_init_i2c(i2c, &rt5759_regmap_config);
if (IS_ERR(priv->regmap)) {
ret = PTR_ERR(priv->regmap);
dev_err(&i2c->dev, "Failed to allocate regmap (%d)\n", ret);
return ret;
}
ret = rt5759_manufacturer_check(priv);
if (ret) {
dev_err(&i2c->dev, "Failed to check device (%d)\n", ret);
return ret;
}
ret = rt5759_init_device_property(priv);
if (ret) {
dev_err(&i2c->dev, "Failed to init device (%d)\n", ret);
return ret;
}
return rt5759_regulator_register(priv);
}
static const struct of_device_id __maybe_unused rt5759_device_table[] = {
{ .compatible = "richtek,rt5759", .data = (void *)CHIP_TYPE_RT5759 },
{ .compatible = "richtek,rt5759a", .data = (void *)CHIP_TYPE_RT5759A },
{}
};
MODULE_DEVICE_TABLE(of, rt5759_device_table);
static struct i2c_driver rt5759_driver = {
.driver = {
.name = "rt5759",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(rt5759_device_table),
},
.probe = rt5759_probe,
};
module_i2c_driver(rt5759_driver);
MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
MODULE_DESCRIPTION("Richtek RT5759 Regulator Driver");
MODULE_LICENSE("GPL v2");
