// SPDX-License-Identifier: GPL-2.0+
#include <linux/bits.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
enum {
MT6370_IDX_DSVBOOST = 0,
MT6370_IDX_DSVPOS,
MT6370_IDX_DSVNEG,
MT6370_IDX_VIBLDO,
MT6370_MAX_IDX
};
#define MT6370_REG_LDO_CFG 0x180
#define MT6370_REG_LDO_VOUT 0x181
#define MT6370_REG_DB_CTRL1 0x1B0
#define MT6370_REG_DB_CTRL2 0x1B1
#define MT6370_REG_DB_VBST 0x1B2
#define MT6370_REG_DB_VPOS 0x1B3
#define MT6370_REG_DB_VNEG 0x1B4
#define MT6370_REG_LDO_STAT 0x1DC
#define MT6370_REG_DB_STAT 0x1DF
#define MT6370_LDOOMS_MASK BIT(7)
#define MT6370_LDOEN_MASK BIT(7)
#define MT6370_LDOVOUT_MASK GENMASK(3, 0)
#define MT6370_DBPERD_MASK (BIT(7) | BIT(4))
#define MT6370_DBEXTEN_MASK BIT(0)
#define MT6370_DBVPOSEN_MASK BIT(6)
#define MT6370_DBVPOSDISG_MASK BIT(5)
#define MT6370_DBVNEGEN_MASK BIT(3)
#define MT6370_DBVNEGDISG_MASK BIT(2)
#define MT6370_DBALLON_MASK (MT6370_DBVPOSEN_MASK | MT6370_DBVNEGEN_MASK)
#define MT6370_DBSLEW_MASK GENMASK(7, 6)
#define MT6370_DBVOUT_MASK GENMASK(5, 0)
#define MT6370_LDOOC_EVT_MASK BIT(7)
#define MT6370_POSSCP_EVT_MASK BIT(7)
#define MT6370_NEGSCP_EVT_MASK BIT(6)
#define MT6370_BSTOCP_EVT_MASK BIT(5)
#define MT6370_POSOCP_EVT_MASK BIT(4)
#define MT6370_NEGOCP_EVT_MASK BIT(3)
#define MT6370_LDO_MINUV 1600000
#define MT6370_LDO_STPUV 200000
#define MT6370_LDO_N_VOLT 13
#define MT6370_DBVBOOST_MINUV 4000000
#define MT6370_DBVBOOST_STPUV 50000
#define MT6370_DBVBOOST_N_VOLT 45
#define MT6370_DBVOUT_MINUV 4000000
#define MT6370_DBVOUT_STPUV 50000
#define MT6370_DBVOUT_N_VOLT 41
struct mt6370_priv {
struct device *dev;
struct regmap *regmap;
struct regulator_dev *rdev[MT6370_MAX_IDX];
bool use_external_ctrl;
};
static const unsigned int mt6370_vpos_ramp_tbl[] = { 8540, 5840, 4830, 3000 };
static const unsigned int mt6370_vneg_ramp_tbl[] = { 10090, 6310, 5050, 3150 };
static int mt6370_get_error_flags(struct regulator_dev *rdev,
unsigned int *flags)
{
struct regmap *regmap = rdev_get_regmap(rdev);
unsigned int stat_reg, stat, rpt_flags = 0;
int rid = rdev_get_id(rdev), ret;
if (rid == MT6370_IDX_VIBLDO)
stat_reg = MT6370_REG_LDO_STAT;
else
stat_reg = MT6370_REG_DB_STAT;
ret = regmap_read(regmap, stat_reg, &stat);
if (ret)
return ret;
switch (rid) {
case MT6370_IDX_DSVBOOST:
if (stat & MT6370_BSTOCP_EVT_MASK)
rpt_flags |= REGULATOR_ERROR_OVER_CURRENT;
break;
case MT6370_IDX_DSVPOS:
if (stat & MT6370_POSSCP_EVT_MASK)
rpt_flags |= REGULATOR_ERROR_UNDER_VOLTAGE;
if (stat & MT6370_POSOCP_EVT_MASK)
rpt_flags |= REGULATOR_ERROR_OVER_CURRENT;
break;
case MT6370_IDX_DSVNEG:
if (stat & MT6370_NEGSCP_EVT_MASK)
rpt_flags |= REGULATOR_ERROR_UNDER_VOLTAGE;
if (stat & MT6370_NEGOCP_EVT_MASK)
rpt_flags |= REGULATOR_ERROR_OVER_CURRENT;
break;
default:
if (stat & MT6370_LDOOC_EVT_MASK)
rpt_flags |= REGULATOR_ERROR_OVER_CURRENT;
break;
}
*flags = rpt_flags;
return 0;
}
static const struct regulator_ops mt6370_dbvboost_ops = {
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear,
.get_bypass = regulator_get_bypass_regmap,
.set_bypass = regulator_set_bypass_regmap,
.get_error_flags = mt6370_get_error_flags,
};
static const struct regulator_ops mt6370_dbvout_ops = {
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear,
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.set_active_discharge = regulator_set_active_discharge_regmap,
.set_ramp_delay = regulator_set_ramp_delay_regmap,
.get_error_flags = mt6370_get_error_flags,
};
static const struct regulator_ops mt6370_ldo_ops = {
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear,
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.set_active_discharge = regulator_set_active_discharge_regmap,
.get_error_flags = mt6370_get_error_flags,
};
static int mt6370_of_parse_cb(struct device_node *np,
const struct regulator_desc *desc,
struct regulator_config *config)
{
struct mt6370_priv *priv = config->driver_data;
struct gpio_desc *enable_gpio;
int ret;
enable_gpio = fwnode_gpiod_get_index(of_fwnode_handle(np), "enable", 0,
GPIOD_OUT_HIGH |
GPIOD_FLAGS_BIT_NONEXCLUSIVE,
desc->name);
if (IS_ERR(enable_gpio)) {
config->ena_gpiod = NULL;
return 0;
}
/*
* RG control by default
* Only if all are using external pin, change all by external control
*/
if (priv->use_external_ctrl) {
ret = regmap_update_bits(priv->regmap, MT6370_REG_DB_CTRL1,
MT6370_DBEXTEN_MASK,
MT6370_DBEXTEN_MASK);
if (ret)
return ret;
}
config->ena_gpiod = enable_gpio;
priv->use_external_ctrl = true;
return 0;
}
static const struct regulator_desc mt6370_regulator_descs[] = {
{
.name = "mt6370-dsv-vbst",
.of_match = of_match_ptr("dsvbst"),
.regulators_node = of_match_ptr("regulators"),
.id = MT6370_IDX_DSVBOOST,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.ops = &mt6370_dbvboost_ops,
.min_uV = MT6370_DBVBOOST_MINUV,
.uV_step = MT6370_DBVBOOST_STPUV,
.n_voltages = MT6370_DBVBOOST_N_VOLT,
.vsel_reg = MT6370_REG_DB_VBST,
.vsel_mask = MT6370_DBVOUT_MASK,
.bypass_reg = MT6370_REG_DB_CTRL1,
.bypass_mask = MT6370_DBPERD_MASK,
.bypass_val_on = MT6370_DBPERD_MASK,
},
{
.name = "mt6370-dsv-vpos",
.of_match = of_match_ptr("dsvpos"),
.regulators_node = of_match_ptr("regulators"),
.id = MT6370_IDX_DSVPOS,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.of_parse_cb = mt6370_of_parse_cb,
.ops = &mt6370_dbvout_ops,
.min_uV = MT6370_DBVOUT_MINUV,
.uV_step = MT6370_DBVOUT_STPUV,
.n_voltages = MT6370_DBVOUT_N_VOLT,
.vsel_reg = MT6370_REG_DB_VPOS,
.vsel_mask = MT6370_DBVOUT_MASK,
.enable_reg = MT6370_REG_DB_CTRL2,
.enable_mask = MT6370_DBVPOSEN_MASK,
.ramp_reg = MT6370_REG_DB_VPOS,
.ramp_mask = MT6370_DBSLEW_MASK,
.ramp_delay_table = mt6370_vpos_ramp_tbl,
.n_ramp_values = ARRAY_SIZE(mt6370_vpos_ramp_tbl),
.active_discharge_reg = MT6370_REG_DB_CTRL2,
.active_discharge_mask = MT6370_DBVPOSDISG_MASK,
.active_discharge_on = MT6370_DBVPOSDISG_MASK,
},
{
.name = "mt6370-dsv-vneg",
.of_match = of_match_ptr("dsvneg"),
.regulators_node = of_match_ptr("regulators"),
.id = MT6370_IDX_DSVNEG,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.of_parse_cb = mt6370_of_parse_cb,
.ops = &mt6370_dbvout_ops,
.min_uV = MT6370_DBVOUT_MINUV,
.uV_step = MT6370_DBVOUT_STPUV,
.n_voltages = MT6370_DBVOUT_N_VOLT,
.vsel_reg = MT6370_REG_DB_VNEG,
.vsel_mask = MT6370_DBVOUT_MASK,
.enable_reg = MT6370_REG_DB_CTRL2,
.enable_mask = MT6370_DBVNEGEN_MASK,
.ramp_reg = MT6370_REG_DB_VNEG,
.ramp_mask = MT6370_DBSLEW_MASK,
.ramp_delay_table = mt6370_vneg_ramp_tbl,
.n_ramp_values = ARRAY_SIZE(mt6370_vneg_ramp_tbl),
.active_discharge_reg = MT6370_REG_DB_CTRL2,
.active_discharge_mask = MT6370_DBVNEGDISG_MASK,
.active_discharge_on = MT6370_DBVNEGDISG_MASK,
},
{
.name = "mt6370-vib-ldo",
.of_match = of_match_ptr("vibldo"),
.regulators_node = of_match_ptr("regulators"),
.id = MT6370_IDX_VIBLDO,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.ops = &mt6370_ldo_ops,
.min_uV = MT6370_LDO_MINUV,
.uV_step = MT6370_LDO_STPUV,
.n_voltages = MT6370_LDO_N_VOLT,
.vsel_reg = MT6370_REG_LDO_VOUT,
.vsel_mask = MT6370_LDOVOUT_MASK,
.enable_reg = MT6370_REG_LDO_VOUT,
.enable_mask = MT6370_LDOEN_MASK,
.active_discharge_reg = MT6370_REG_LDO_CFG,
.active_discharge_mask = MT6370_LDOOMS_MASK,
.active_discharge_on = MT6370_LDOOMS_MASK,
}
};
static irqreturn_t mt6370_scp_handler(int irq, void *data)
{
struct regulator_dev *rdev = data;
regulator_notifier_call_chain(rdev, REGULATOR_EVENT_UNDER_VOLTAGE,
NULL);
return IRQ_HANDLED;
}
static irqreturn_t mt6370_ocp_handler(int irq, void *data)
{
struct regulator_dev *rdev = data;
regulator_notifier_call_chain(rdev, REGULATOR_EVENT_OVER_CURRENT, NULL);
return IRQ_HANDLED;
}
static int mt6370_regulator_irq_register(struct mt6370_priv *priv)
{
struct platform_device *pdev = to_platform_device(priv->dev);
static const struct {
const char *name;
int rid;
irq_handler_t handler;
} mt6370_irqs[] = {
{ "db_vpos_scp", MT6370_IDX_DSVPOS, mt6370_scp_handler },
{ "db_vneg_scp", MT6370_IDX_DSVNEG, mt6370_scp_handler },
{ "db_vbst_ocp", MT6370_IDX_DSVBOOST, mt6370_ocp_handler },
{ "db_vpos_ocp", MT6370_IDX_DSVPOS, mt6370_ocp_handler },
{ "db_vneg_ocp", MT6370_IDX_DSVNEG, mt6370_ocp_handler },
{ "ldo_oc", MT6370_IDX_VIBLDO, mt6370_ocp_handler }
};
struct regulator_dev *rdev;
int i, irq, ret;
for (i = 0; i < ARRAY_SIZE(mt6370_irqs); i++) {
irq = platform_get_irq_byname(pdev, mt6370_irqs[i].name);
rdev = priv->rdev[mt6370_irqs[i].rid];
ret = devm_request_threaded_irq(priv->dev, irq, NULL,
mt6370_irqs[i].handler, 0,
mt6370_irqs[i].name, rdev);
if (ret) {
dev_err(priv->dev,
"Failed to register (%d) interrupt\n", i);
return ret;
}
}
return 0;
}
static int mt6370_regualtor_register(struct mt6370_priv *priv)
{
struct regulator_dev *rdev;
struct regulator_config cfg = {};
struct device *parent = priv->dev->parent;
int i;
cfg.dev = parent;
cfg.driver_data = priv;
for (i = 0; i < MT6370_MAX_IDX; i++) {
rdev = devm_regulator_register(priv->dev,
mt6370_regulator_descs + i,
&cfg);
if (IS_ERR(rdev)) {
dev_err(priv->dev,
"Failed to register (%d) regulator\n", i);
return PTR_ERR(rdev);
}
priv->rdev[i] = rdev;
}
return 0;
}
static int mt6370_regulator_probe(struct platform_device *pdev)
{
struct mt6370_priv *priv;
int ret;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->dev = &pdev->dev;
priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!priv->regmap) {
dev_err(&pdev->dev, "Failed to init regmap\n");
return -ENODEV;
}
ret = mt6370_regualtor_register(priv);
if (ret)
return ret;
return mt6370_regulator_irq_register(priv);
}
static const struct platform_device_id mt6370_devid_table[] = {
{ "mt6370-regulator", 0},
{}
};
MODULE_DEVICE_TABLE(platform, mt6370_devid_table);
static struct platform_driver mt6370_regulator_driver = {
.driver = {
.name = "mt6370-regulator",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.id_table = mt6370_devid_table,
.probe = mt6370_regulator_probe,
};
module_platform_driver(mt6370_regulator_driver);
MODULE_AUTHOR("ChiYuan Huang <[email protected]>");
MODULE_DESCRIPTION("Mediatek MT6370 Regulator Driver");
MODULE_LICENSE("GPL v2");
Codebase Browser
linux