#include <dt-bindings/regulator/richtek,rt5190a-regulator.h>
#include <linux/bits.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#define RT5190A_REG_MANUFACTURE 0x00
#define RT5190A_REG_BUCK2VSEL 0x04
#define RT5190A_REG_BUCK3VSEL 0x05
#define RT5190A_REG_DCDCCNTL 0x06
#define RT5190A_REG_ENABLE 0x07
#define RT5190A_REG_DISCHARGE 0x09
#define RT5190A_REG_PROTMODE 0x0A
#define RT5190A_REG_MUTECNTL 0x0B
#define RT5190A_REG_PGSTAT 0x0F
#define RT5190A_REG_OVINT 0x10
#define RT5190A_REG_HOTDIEMASK 0x17
#define RT5190A_VSEL_MASK GENMASK(6, 0)
#define RT5190A_RID_BITMASK(rid) BIT(rid + 1)
#define RT5190A_BUCK1_DISCHG_MASK GENMASK(1, 0)
#define RT5190A_BUCK1_DISCHG_ONVAL 0x01
#define RT5190A_OVERVOLT_MASK GENMASK(7, 0)
#define RT5190A_UNDERVOLT_MASK GENMASK(15, 8)
#define RT5190A_CH234OT_MASK BIT(29)
#define RT5190A_CHIPOT_MASK BIT(28)
#define RT5190A_BUCK23_MINUV 600000
#define RT5190A_BUCK23_MAXUV 1400000
#define RT5190A_BUCK23_STEPUV 10000
#define RT5190A_BUCK23_STEPNUM ((1400000 - 600000) / 10000 + 1)
enum {
RT5190A_IDX_BUCK1 = 0,
RT5190A_IDX_BUCK2,
RT5190A_IDX_BUCK3,
RT5190A_IDX_BUCK4,
RT5190A_IDX_LDO,
RT5190A_MAX_IDX
};
struct rt5190a_priv {
struct device *dev;
struct regmap *regmap;
struct regulator_desc rdesc[RT5190A_MAX_IDX];
struct regulator_dev *rdev[RT5190A_MAX_IDX];
};
static int rt5190a_get_error_flags(struct regulator_dev *rdev,
unsigned int *flags)
{
struct regmap *regmap = rdev_get_regmap(rdev);
int rid = rdev_get_id(rdev);
unsigned int pgood_stat;
int ret;
ret = regmap_read(regmap, RT5190A_REG_PGSTAT, &pgood_stat);
if (ret)
return ret;
if (!(pgood_stat & RT5190A_RID_BITMASK(rid)))
*flags = REGULATOR_ERROR_FAIL;
else
*flags = 0;
return 0;
}
static int rt5190a_fixed_buck_set_mode(struct regulator_dev *rdev,
unsigned int mode)
{
struct regmap *regmap = rdev_get_regmap(rdev);
int rid = rdev_get_id(rdev);
unsigned int mask = RT5190A_RID_BITMASK(rid), val;
switch (mode) {
case REGULATOR_MODE_FAST:
val = mask;
break;
case REGULATOR_MODE_NORMAL:
val = 0;
break;
default:
return -EINVAL;
}
return regmap_update_bits(regmap, RT5190A_REG_DCDCCNTL, mask, val);
}
static unsigned int rt5190a_fixed_buck_get_mode(struct regulator_dev *rdev)
{
struct regmap *regmap = rdev_get_regmap(rdev);
int rid = rdev_get_id(rdev);
unsigned int val;
int ret;
ret = regmap_read(regmap, RT5190A_REG_DCDCCNTL, &val);
if (ret) {
dev_err(&rdev->dev, "Failed to get mode [%d]\n", ret);
return ret;
}
if (val & RT5190A_RID_BITMASK(rid))
return REGULATOR_MODE_FAST;
return REGULATOR_MODE_NORMAL;
}
static const struct regulator_ops rt5190a_ranged_buck_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear,
.set_active_discharge = regulator_set_active_discharge_regmap,
.get_error_flags = rt5190a_get_error_flags,
};
static const struct regulator_ops rt5190a_fixed_buck_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_active_discharge = regulator_set_active_discharge_regmap,
.set_mode = rt5190a_fixed_buck_set_mode,
.get_mode = rt5190a_fixed_buck_get_mode,
.get_error_flags = rt5190a_get_error_flags,
};
static const struct regulator_ops rt5190a_fixed_ldo_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_active_discharge = regulator_set_active_discharge_regmap,
.get_error_flags = rt5190a_get_error_flags,
};
static irqreturn_t rt5190a_irq_handler(int irq, void *data)
{
struct rt5190a_priv *priv = data;
__le32 raws;
unsigned int events, fields;
static const struct {
unsigned int bitmask;
unsigned int report;
} event_tbl[] = {
{ RT5190A_OVERVOLT_MASK, REGULATOR_ERROR_REGULATION_OUT },
{ RT5190A_UNDERVOLT_MASK, REGULATOR_ERROR_UNDER_VOLTAGE }
};
int i, j, ret;
ret = regmap_raw_read(priv->regmap, RT5190A_REG_OVINT, &raws,
sizeof(raws));
if (ret) {
dev_err(priv->dev, "Failed to read events\n");
return IRQ_NONE;
}
events = le32_to_cpu(raws);
ret = regmap_raw_write(priv->regmap, RT5190A_REG_OVINT, &raws,
sizeof(raws));
if (ret)
dev_err(priv->dev, "Failed to write-clear events\n");
for (i = 0; i < ARRAY_SIZE(event_tbl); i++) {
fields = events & event_tbl[i].bitmask;
fields >>= ffs(event_tbl[i].bitmask) - 1;
for (j = 0; j < RT5190A_MAX_IDX; j++) {
if (!(fields & RT5190A_RID_BITMASK(j)))
continue;
regulator_notifier_call_chain(priv->rdev[j],
event_tbl[i].report,
NULL);
}
}
if (events & RT5190A_CH234OT_MASK) {
for (j = RT5190A_IDX_BUCK2; j < RT5190A_IDX_LDO; j++) {
regulator_notifier_call_chain(priv->rdev[j],
REGULATOR_ERROR_OVER_TEMP,
NULL);
}
}
if (events & RT5190A_CHIPOT_MASK)
dev_warn(priv->dev, "CHIP overheat\n");
return IRQ_HANDLED;
}
static unsigned int rt5190a_of_map_mode(unsigned int mode)
{
switch (mode) {
case RT5190A_OPMODE_AUTO:
return REGULATOR_MODE_NORMAL;
case RT5190A_OPMODE_FPWM:
return REGULATOR_MODE_FAST;
default:
return REGULATOR_MODE_INVALID;
}
}
static int rt5190a_of_parse_cb(struct rt5190a_priv *priv, int rid,
struct of_regulator_match *match)
{
struct regulator_desc *desc = priv->rdesc + rid;
struct regulator_init_data *init_data = match->init_data;
struct device_node *np = match->of_node;
bool latchup_enable;
unsigned int mask = RT5190A_RID_BITMASK(rid), val;
if (!init_data)
return 0;
switch (rid) {
case RT5190A_IDX_BUCK1:
case RT5190A_IDX_BUCK4:
case RT5190A_IDX_LDO:
init_data->constraints.apply_uV = 0;
if (init_data->constraints.min_uV ==
init_data->constraints.max_uV)
desc->fixed_uV = init_data->constraints.min_uV;
else {
dev_err(priv->dev,
"Variable voltage for fixed regulator\n");
return -EINVAL;
}
break;
default:
break;
}
latchup_enable = of_property_read_bool(np, "richtek,latchup-enable");
val = !latchup_enable ? mask : 0;
return regmap_update_bits(priv->regmap, RT5190A_REG_PROTMODE, mask, val);
}
static void rt5190a_fillin_regulator_desc(struct regulator_desc *desc, int rid)
{
static const char * const regu_name[] = { "buck1", "buck2",
"buck3", "buck4",
"ldo" };
static const char * const supply[] = { NULL, "vin2", "vin3", "vin4",
"vinldo" };
desc->name = regu_name[rid];
desc->supply_name = supply[rid];
desc->owner = THIS_MODULE;
desc->type = REGULATOR_VOLTAGE;
desc->id = rid;
desc->enable_reg = RT5190A_REG_ENABLE;
desc->enable_mask = RT5190A_RID_BITMASK(rid);
desc->active_discharge_reg = RT5190A_REG_DISCHARGE;
desc->active_discharge_mask = RT5190A_RID_BITMASK(rid);
desc->active_discharge_on = RT5190A_RID_BITMASK(rid);
switch (rid) {
case RT5190A_IDX_BUCK1:
desc->active_discharge_mask = RT5190A_BUCK1_DISCHG_MASK;
desc->active_discharge_on = RT5190A_BUCK1_DISCHG_ONVAL;
desc->n_voltages = 1;
desc->ops = &rt5190a_fixed_buck_ops;
desc->of_map_mode = rt5190a_of_map_mode;
break;
case RT5190A_IDX_BUCK2:
desc->vsel_reg = RT5190A_REG_BUCK2VSEL;
desc->vsel_mask = RT5190A_VSEL_MASK;
desc->min_uV = RT5190A_BUCK23_MINUV;
desc->uV_step = RT5190A_BUCK23_STEPUV;
desc->n_voltages = RT5190A_BUCK23_STEPNUM;
desc->ops = &rt5190a_ranged_buck_ops;
break;
case RT5190A_IDX_BUCK3:
desc->vsel_reg = RT5190A_REG_BUCK3VSEL;
desc->vsel_mask = RT5190A_VSEL_MASK;
desc->min_uV = RT5190A_BUCK23_MINUV;
desc->uV_step = RT5190A_BUCK23_STEPUV;
desc->n_voltages = RT5190A_BUCK23_STEPNUM;
desc->ops = &rt5190a_ranged_buck_ops;
break;
case RT5190A_IDX_BUCK4:
desc->n_voltages = 1;
desc->ops = &rt5190a_fixed_buck_ops;
desc->of_map_mode = rt5190a_of_map_mode;
break;
case RT5190A_IDX_LDO:
desc->n_voltages = 1;
desc->ops = &rt5190a_fixed_ldo_ops;
break;
}
}
static struct of_regulator_match rt5190a_regulator_match[] = {
{ .name = "buck1", },
{ .name = "buck2", },
{ .name = "buck3", },
{ .name = "buck4", },
{ .name = "ldo", }
};
static int rt5190a_parse_regulator_dt_data(struct rt5190a_priv *priv)
{
struct device_node *regulator_np;
struct regulator_desc *reg_desc;
struct of_regulator_match *match;
int i, ret;
for (i = 0; i < RT5190A_MAX_IDX; i++) {
reg_desc = priv->rdesc + i;
match = rt5190a_regulator_match + i;
rt5190a_fillin_regulator_desc(reg_desc, i);
match->desc = reg_desc;
}
regulator_np = of_get_child_by_name(priv->dev->of_node, "regulators");
if (!regulator_np) {
dev_err(priv->dev, "Could not find 'regulators' node\n");
return -ENODEV;
}
ret = of_regulator_match(priv->dev, regulator_np,
rt5190a_regulator_match,
ARRAY_SIZE(rt5190a_regulator_match));
of_node_put(regulator_np);
if (ret < 0) {
dev_err(priv->dev,
"Error parsing regulator init data: %d\n", ret);
return ret;
}
for (i = 0; i < RT5190A_MAX_IDX; i++) {
match = rt5190a_regulator_match + i;
ret = rt5190a_of_parse_cb(priv, i, match);
if (ret) {
dev_err(priv->dev, "Failed in [%d] of_parse_cb\n", i);
return ret;
}
}
return 0;
}
static const struct reg_sequence rt5190a_init_patch[] = {
{ 0x09, 0x3d, },
{ 0x0a, 0x3e, },
{ 0x0b, 0x01, },
{ 0x10, 0xff, },
{ 0x11, 0xff, },
{ 0x12, 0xff, },
{ 0x13, 0xff, },
{ 0x14, 0, },
{ 0x15, 0, },
{ 0x16, 0x3e, },
{ 0x17, 0, }
};
static int rt5190a_device_initialize(struct rt5190a_priv *priv)
{
bool mute_enable;
int ret;
ret = regmap_register_patch(priv->regmap, rt5190a_init_patch,
ARRAY_SIZE(rt5190a_init_patch));
if (ret) {
dev_err(priv->dev, "Failed to do register patch\n");
return ret;
}
mute_enable = device_property_read_bool(priv->dev,
"richtek,mute-enable");
if (mute_enable) {
ret = regmap_write(priv->regmap, RT5190A_REG_MUTECNTL, 0x00);
if (ret) {
dev_err(priv->dev, "Failed to enable mute function\n");
return ret;
}
}
return 0;
}
static int rt5190a_device_check(struct rt5190a_priv *priv)
{
u16 devid;
int ret;
ret = regmap_raw_read(priv->regmap, RT5190A_REG_MANUFACTURE, &devid,
sizeof(devid));
if (ret)
return ret;
if (devid) {
dev_err(priv->dev, "Incorrect device id 0x%04x\n", devid);
return -ENODEV;
}
return 0;
}
static const struct regmap_config rt5190a_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = RT5190A_REG_HOTDIEMASK,
};
static int rt5190a_probe(struct i2c_client *i2c)
{
struct rt5190a_priv *priv;
struct regulator_config cfg = {};
int i, ret;
priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->dev = &i2c->dev;
priv->regmap = devm_regmap_init_i2c(i2c, &rt5190a_regmap_config);
if (IS_ERR(priv->regmap)) {
dev_err(&i2c->dev, "Failed to allocate regmap\n");
return PTR_ERR(priv->regmap);
}
ret = rt5190a_device_check(priv);
if (ret) {
dev_err(&i2c->dev, "Failed to check device %d\n", ret);
return ret;
}
ret = rt5190a_device_initialize(priv);
if (ret) {
dev_err(&i2c->dev, "Failed to initialize the device\n");
return ret;
}
ret = rt5190a_parse_regulator_dt_data(priv);
if (ret) {
dev_err(&i2c->dev, "Failed to parse regulator dt\n");
return ret;
}
cfg.dev = &i2c->dev;
cfg.regmap = priv->regmap;
for (i = 0; i < RT5190A_MAX_IDX; i++) {
struct regulator_desc *desc = priv->rdesc + i;
struct of_regulator_match *match = rt5190a_regulator_match + i;
cfg.init_data = match->init_data;
cfg.of_node = match->of_node;
priv->rdev[i] = devm_regulator_register(&i2c->dev, desc, &cfg);
if (IS_ERR(priv->rdev[i])) {
dev_err(&i2c->dev, "Failed to register regulator %s\n",
desc->name);
return PTR_ERR(priv->rdev[i]);
}
}
if (i2c->irq) {
ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
rt5190a_irq_handler,
IRQF_ONESHOT,
dev_name(&i2c->dev), priv);
if (ret) {
dev_err(&i2c->dev, "Failed to register interrupt\n");
return ret;
}
}
return 0;
}
static const struct of_device_id __maybe_unused rt5190a_device_table[] = {
{ .compatible = "richtek,rt5190a", },
{}
};
MODULE_DEVICE_TABLE(of, rt5190a_device_table);
static struct i2c_driver rt5190a_driver = {
.driver = {
.name = "rt5190a",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = rt5190a_device_table,
},
.probe = rt5190a_probe,
};
module_i2c_driver(rt5190a_driver);
MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
MODULE_DESCRIPTION("Richtek RT5190A Regulator Driver");
MODULE_LICENSE("GPL v2");
