// SPDX-License-Identifier: GPL-2.0-or-later
/*
* MP2629 battery charger driver
*
* Copyright 2020 Monolithic Power Systems, Inc
*
* Author: Saravanan Sekar <[email protected]>
*/
#include <linux/bits.h>
#include <linux/iio/consumer.h>
#include <linux/iio/types.h>
#include <linux/interrupt.h>
#include <linux/mfd/mp2629.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#define MP2629_REG_INPUT_ILIM 0x00
#define MP2629_REG_INPUT_VLIM 0x01
#define MP2629_REG_CHARGE_CTRL 0x04
#define MP2629_REG_CHARGE_ILIM 0x05
#define MP2629_REG_PRECHARGE 0x06
#define MP2629_REG_TERM_CURRENT 0x06
#define MP2629_REG_CHARGE_VLIM 0x07
#define MP2629_REG_TIMER_CTRL 0x08
#define MP2629_REG_IMPEDANCE_COMP 0x09
#define MP2629_REG_INTERRUPT 0x0b
#define MP2629_REG_STATUS 0x0c
#define MP2629_REG_FAULT 0x0d
#define MP2629_MASK_INPUT_TYPE GENMASK(7, 5)
#define MP2629_MASK_CHARGE_TYPE GENMASK(4, 3)
#define MP2629_MASK_CHARGE_CTRL GENMASK(5, 4)
#define MP2629_MASK_WDOG_CTRL GENMASK(5, 4)
#define MP2629_MASK_IMPEDANCE GENMASK(7, 4)
#define MP2629_INPUTSOURCE_CHANGE GENMASK(7, 5)
#define MP2629_CHARGING_CHANGE GENMASK(4, 3)
#define MP2629_FAULT_BATTERY BIT(3)
#define MP2629_FAULT_THERMAL BIT(4)
#define MP2629_FAULT_INPUT BIT(5)
#define MP2629_FAULT_OTG BIT(6)
#define MP2629_MAX_BATT_CAPACITY 100
#define MP2629_PROPS(_idx, _min, _max, _step) \
[_idx] = { \
.min = _min, \
.max = _max, \
.step = _step, \
}
enum mp2629_source_type {
MP2629_SOURCE_TYPE_NO_INPUT,
MP2629_SOURCE_TYPE_NON_STD,
MP2629_SOURCE_TYPE_SDP,
MP2629_SOURCE_TYPE_CDP,
MP2629_SOURCE_TYPE_DCP,
MP2629_SOURCE_TYPE_OTG = 7,
};
enum mp2629_field {
INPUT_ILIM,
INPUT_VLIM,
CHARGE_ILIM,
CHARGE_VLIM,
PRECHARGE,
TERM_CURRENT,
MP2629_MAX_FIELD
};
struct mp2629_charger {
struct device *dev;
int status;
int fault;
struct regmap *regmap;
struct regmap_field *regmap_fields[MP2629_MAX_FIELD];
struct mutex lock;
struct power_supply *usb;
struct power_supply *battery;
struct iio_channel *iiochan[MP2629_ADC_CHAN_END];
};
struct mp2629_prop {
int reg;
int mask;
int min;
int max;
int step;
int shift;
};
static enum power_supply_property mp2629_charger_usb_props[] = {
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_USB_TYPE,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT,
};
static enum power_supply_property mp2629_charger_bat_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_CHARGE_TYPE,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
};
static struct mp2629_prop props[] = {
MP2629_PROPS(INPUT_ILIM, 100000, 3250000, 50000),
MP2629_PROPS(INPUT_VLIM, 3800000, 5300000, 100000),
MP2629_PROPS(CHARGE_ILIM, 320000, 4520000, 40000),
MP2629_PROPS(CHARGE_VLIM, 3400000, 4670000, 10000),
MP2629_PROPS(PRECHARGE, 120000, 720000, 40000),
MP2629_PROPS(TERM_CURRENT, 80000, 680000, 40000),
};
static const struct reg_field mp2629_reg_fields[] = {
[INPUT_ILIM] = REG_FIELD(MP2629_REG_INPUT_ILIM, 0, 5),
[INPUT_VLIM] = REG_FIELD(MP2629_REG_INPUT_VLIM, 0, 3),
[CHARGE_ILIM] = REG_FIELD(MP2629_REG_CHARGE_ILIM, 0, 6),
[CHARGE_VLIM] = REG_FIELD(MP2629_REG_CHARGE_VLIM, 1, 7),
[PRECHARGE] = REG_FIELD(MP2629_REG_PRECHARGE, 4, 7),
[TERM_CURRENT] = REG_FIELD(MP2629_REG_TERM_CURRENT, 0, 3),
};
static char *adc_chan_name[] = {
"mp2629-batt-volt",
"mp2629-system-volt",
"mp2629-input-volt",
"mp2629-batt-current",
"mp2629-input-current",
};
static int mp2629_read_adc(struct mp2629_charger *charger,
enum mp2629_adc_chan ch,
union power_supply_propval *val)
{
int ret;
int chval;
ret = iio_read_channel_processed(charger->iiochan[ch], &chval);
if (ret)
return ret;
val->intval = chval * 1000;
return 0;
}
static int mp2629_get_prop(struct mp2629_charger *charger,
enum mp2629_field fld,
union power_supply_propval *val)
{
int ret;
unsigned int rval;
ret = regmap_field_read(charger->regmap_fields[fld], &rval);
if (ret)
return ret;
val->intval = rval * props[fld].step + props[fld].min;
return 0;
}
static int mp2629_set_prop(struct mp2629_charger *charger,
enum mp2629_field fld,
const union power_supply_propval *val)
{
unsigned int rval;
if (val->intval < props[fld].min || val->intval > props[fld].max)
return -EINVAL;
rval = (val->intval - props[fld].min) / props[fld].step;
return regmap_field_write(charger->regmap_fields[fld], rval);
}
static int mp2629_get_battery_capacity(struct mp2629_charger *charger,
union power_supply_propval *val)
{
union power_supply_propval vnow, vlim;
int ret;
ret = mp2629_read_adc(charger, MP2629_BATT_VOLT, &vnow);
if (ret)
return ret;
ret = mp2629_get_prop(charger, CHARGE_VLIM, &vlim);
if (ret)
return ret;
val->intval = (vnow.intval * 100) / vlim.intval;
val->intval = min(val->intval, MP2629_MAX_BATT_CAPACITY);
return 0;
}
static int mp2629_charger_battery_get_prop(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct mp2629_charger *charger = dev_get_drvdata(psy->dev.parent);
unsigned int rval;
int ret = 0;
switch (psp) {
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
ret = mp2629_read_adc(charger, MP2629_BATT_VOLT, val);
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
ret = mp2629_read_adc(charger, MP2629_BATT_CURRENT, val);
break;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
val->intval = 4520000;
break;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
val->intval = 4670000;
break;
case POWER_SUPPLY_PROP_CAPACITY:
ret = mp2629_get_battery_capacity(charger, val);
break;
case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
ret = mp2629_get_prop(charger, TERM_CURRENT, val);
break;
case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
ret = mp2629_get_prop(charger, PRECHARGE, val);
break;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
ret = mp2629_get_prop(charger, CHARGE_VLIM, val);
break;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
ret = mp2629_get_prop(charger, CHARGE_ILIM, val);
break;
case POWER_SUPPLY_PROP_HEALTH:
if (!charger->fault)
val->intval = POWER_SUPPLY_HEALTH_GOOD;
if (MP2629_FAULT_BATTERY & charger->fault)
val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
else if (MP2629_FAULT_THERMAL & charger->fault)
val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
else if (MP2629_FAULT_INPUT & charger->fault)
val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
break;
case POWER_SUPPLY_PROP_STATUS:
ret = regmap_read(charger->regmap, MP2629_REG_STATUS, &rval);
if (ret)
break;
rval = (rval & MP2629_MASK_CHARGE_TYPE) >> 3;
switch (rval) {
case 0x00:
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
break;
case 0x01:
case 0x10:
val->intval = POWER_SUPPLY_STATUS_CHARGING;
break;
case 0x11:
val->intval = POWER_SUPPLY_STATUS_FULL;
}
break;
case POWER_SUPPLY_PROP_CHARGE_TYPE:
ret = regmap_read(charger->regmap, MP2629_REG_STATUS, &rval);
if (ret)
break;
rval = (rval & MP2629_MASK_CHARGE_TYPE) >> 3;
switch (rval) {
case 0x00:
val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
break;
case 0x01:
val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
break;
case 0x10:
val->intval = POWER_SUPPLY_CHARGE_TYPE_STANDARD;
break;
default:
val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
}
break;
default:
return -EINVAL;
}
return ret;
}
static int mp2629_charger_battery_set_prop(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct mp2629_charger *charger = dev_get_drvdata(psy->dev.parent);
switch (psp) {
case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
return mp2629_set_prop(charger, TERM_CURRENT, val);
case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
return mp2629_set_prop(charger, PRECHARGE, val);
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
return mp2629_set_prop(charger, CHARGE_VLIM, val);
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
return mp2629_set_prop(charger, CHARGE_ILIM, val);
default:
return -EINVAL;
}
}
static int mp2629_charger_usb_get_prop(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct mp2629_charger *charger = dev_get_drvdata(psy->dev.parent);
unsigned int rval;
int ret;
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
ret = regmap_read(charger->regmap, MP2629_REG_STATUS, &rval);
if (ret)
break;
val->intval = !!(rval & MP2629_MASK_INPUT_TYPE);
break;
case POWER_SUPPLY_PROP_USB_TYPE:
ret = regmap_read(charger->regmap, MP2629_REG_STATUS, &rval);
if (ret)
break;
rval = (rval & MP2629_MASK_INPUT_TYPE) >> 5;
switch (rval) {
case MP2629_SOURCE_TYPE_SDP:
val->intval = POWER_SUPPLY_USB_TYPE_SDP;
break;
case MP2629_SOURCE_TYPE_CDP:
val->intval = POWER_SUPPLY_USB_TYPE_CDP;
break;
case MP2629_SOURCE_TYPE_DCP:
val->intval = POWER_SUPPLY_USB_TYPE_DCP;
break;
case MP2629_SOURCE_TYPE_OTG:
val->intval = POWER_SUPPLY_USB_TYPE_PD_DRP;
break;
default:
val->intval = POWER_SUPPLY_USB_TYPE_UNKNOWN;
break;
}
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
ret = mp2629_read_adc(charger, MP2629_INPUT_VOLT, val);
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
ret = mp2629_read_adc(charger, MP2629_INPUT_CURRENT, val);
break;
case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
ret = mp2629_get_prop(charger, INPUT_VLIM, val);
break;
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
ret = mp2629_get_prop(charger, INPUT_ILIM, val);
break;
default:
return -EINVAL;
}
return ret;
}
static int mp2629_charger_usb_set_prop(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct mp2629_charger *charger = dev_get_drvdata(psy->dev.parent);
switch (psp) {
case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
return mp2629_set_prop(charger, INPUT_VLIM, val);
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
return mp2629_set_prop(charger, INPUT_ILIM, val);
default:
return -EINVAL;
}
}
static int mp2629_charger_battery_prop_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
return (psp == POWER_SUPPLY_PROP_PRECHARGE_CURRENT) ||
(psp == POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT) ||
(psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT) ||
(psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE);
}
static int mp2629_charger_usb_prop_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
return (psp == POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT) ||
(psp == POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT);
}
static irqreturn_t mp2629_irq_handler(int irq, void *dev_id)
{
struct mp2629_charger *charger = dev_id;
unsigned int rval;
int ret;
mutex_lock(&charger->lock);
ret = regmap_read(charger->regmap, MP2629_REG_FAULT, &rval);
if (ret)
goto unlock;
if (rval) {
charger->fault = rval;
if (MP2629_FAULT_BATTERY & rval)
dev_err(charger->dev, "Battery fault OVP\n");
else if (MP2629_FAULT_THERMAL & rval)
dev_err(charger->dev, "Thermal shutdown fault\n");
else if (MP2629_FAULT_INPUT & rval)
dev_err(charger->dev, "no input or input OVP\n");
else if (MP2629_FAULT_OTG & rval)
dev_err(charger->dev, "VIN overloaded\n");
goto unlock;
}
ret = regmap_read(charger->regmap, MP2629_REG_STATUS, &rval);
if (ret)
goto unlock;
if (rval & MP2629_INPUTSOURCE_CHANGE)
power_supply_changed(charger->usb);
else if (rval & MP2629_CHARGING_CHANGE)
power_supply_changed(charger->battery);
unlock:
mutex_unlock(&charger->lock);
return IRQ_HANDLED;
}
static const struct power_supply_desc mp2629_usb_desc = {
.name = "mp2629_usb",
.type = POWER_SUPPLY_TYPE_USB,
.usb_types = BIT(POWER_SUPPLY_USB_TYPE_SDP) |
BIT(POWER_SUPPLY_USB_TYPE_CDP) |
BIT(POWER_SUPPLY_USB_TYPE_DCP) |
BIT(POWER_SUPPLY_USB_TYPE_PD_DRP) |
BIT(POWER_SUPPLY_USB_TYPE_UNKNOWN),
.properties = mp2629_charger_usb_props,
.num_properties = ARRAY_SIZE(mp2629_charger_usb_props),
.get_property = mp2629_charger_usb_get_prop,
.set_property = mp2629_charger_usb_set_prop,
.property_is_writeable = mp2629_charger_usb_prop_writeable,
};
static const struct power_supply_desc mp2629_battery_desc = {
.name = "mp2629_battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = mp2629_charger_bat_props,
.num_properties = ARRAY_SIZE(mp2629_charger_bat_props),
.get_property = mp2629_charger_battery_get_prop,
.set_property = mp2629_charger_battery_set_prop,
.property_is_writeable = mp2629_charger_battery_prop_writeable,
};
static ssize_t batt_impedance_compensation_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct mp2629_charger *charger = dev_get_drvdata(dev->parent);
unsigned int rval;
int ret;
ret = regmap_read(charger->regmap, MP2629_REG_IMPEDANCE_COMP, &rval);
if (ret)
return ret;
rval = (rval >> 4) * 10;
return sysfs_emit(buf, "%d mohm\n", rval);
}
static ssize_t batt_impedance_compensation_store(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count)
{
struct mp2629_charger *charger = dev_get_drvdata(dev->parent);
unsigned int val;
int ret;
ret = kstrtouint(buf, 10, &val);
if (ret)
return ret;
if (val > 140)
return -ERANGE;
/* multiples of 10 mohm so round off */
val = val / 10;
ret = regmap_update_bits(charger->regmap, MP2629_REG_IMPEDANCE_COMP,
MP2629_MASK_IMPEDANCE, val << 4);
if (ret)
return ret;
return count;
}
static DEVICE_ATTR_RW(batt_impedance_compensation);
static struct attribute *mp2629_charger_sysfs_attrs[] = {
&dev_attr_batt_impedance_compensation.attr,
NULL
};
ATTRIBUTE_GROUPS(mp2629_charger_sysfs);
static void mp2629_charger_disable(void *data)
{
struct mp2629_charger *charger = data;
regmap_update_bits(charger->regmap, MP2629_REG_CHARGE_CTRL,
MP2629_MASK_CHARGE_CTRL, 0);
}
static int mp2629_charger_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mp2629_data *ddata = dev_get_drvdata(dev->parent);
struct mp2629_charger *charger;
struct power_supply_config psy_cfg = {};
int ret, i, irq;
charger = devm_kzalloc(dev, sizeof(*charger), GFP_KERNEL);
if (!charger)
return -ENOMEM;
charger->regmap = ddata->regmap;
charger->dev = dev;
platform_set_drvdata(pdev, charger);
irq = platform_get_irq(to_platform_device(dev->parent), 0);
if (irq < 0)
return irq;
for (i = 0; i < MP2629_MAX_FIELD; i++) {
charger->regmap_fields[i] = devm_regmap_field_alloc(dev,
charger->regmap, mp2629_reg_fields[i]);
if (IS_ERR(charger->regmap_fields[i])) {
dev_err(dev, "regmap field alloc fail %d\n", i);
return PTR_ERR(charger->regmap_fields[i]);
}
}
for (i = 0; i < MP2629_ADC_CHAN_END; i++) {
charger->iiochan[i] = devm_iio_channel_get(dev,
adc_chan_name[i]);
if (IS_ERR(charger->iiochan[i])) {
dev_err(dev, "iio chan get %s err\n", adc_chan_name[i]);
return PTR_ERR(charger->iiochan[i]);
}
}
ret = devm_add_action_or_reset(dev, mp2629_charger_disable, charger);
if (ret)
return ret;
charger->usb = devm_power_supply_register(dev, &mp2629_usb_desc, NULL);
if (IS_ERR(charger->usb)) {
dev_err(dev, "power supply register usb failed\n");
return PTR_ERR(charger->usb);
}
psy_cfg.drv_data = charger;
psy_cfg.attr_grp = mp2629_charger_sysfs_groups;
charger->battery = devm_power_supply_register(dev,
&mp2629_battery_desc, &psy_cfg);
if (IS_ERR(charger->battery)) {
dev_err(dev, "power supply register battery failed\n");
return PTR_ERR(charger->battery);
}
ret = regmap_update_bits(charger->regmap, MP2629_REG_CHARGE_CTRL,
MP2629_MASK_CHARGE_CTRL, BIT(4));
if (ret) {
dev_err(dev, "enable charge fail: %d\n", ret);
return ret;
}
regmap_update_bits(charger->regmap, MP2629_REG_TIMER_CTRL,
MP2629_MASK_WDOG_CTRL, 0);
mutex_init(&charger->lock);
ret = devm_request_threaded_irq(dev, irq, NULL, mp2629_irq_handler,
IRQF_ONESHOT | IRQF_TRIGGER_RISING,
"mp2629-charger", charger);
if (ret) {
dev_err(dev, "failed to request gpio IRQ\n");
return ret;
}
regmap_update_bits(charger->regmap, MP2629_REG_INTERRUPT,
GENMASK(6, 5), BIT(6) | BIT(5));
return 0;
}
static const struct of_device_id mp2629_charger_of_match[] = {
{ .compatible = "mps,mp2629_charger"},
{}
};
MODULE_DEVICE_TABLE(of, mp2629_charger_of_match);
static struct platform_driver mp2629_charger_driver = {
.driver = {
.name = "mp2629_charger",
.of_match_table = mp2629_charger_of_match,
},
.probe = mp2629_charger_probe,
};
module_platform_driver(mp2629_charger_driver);
MODULE_AUTHOR("Saravanan Sekar <[email protected]>");
MODULE_DESCRIPTION("MP2629 Charger driver");
MODULE_LICENSE("GPL");
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