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power: supply: add support for S2MU005 battery fuel gauge device

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Samsung's S2MU005 PMIC, which contains battery charger functionality
also includes a battery fuel gauge device, which is separate from the
PMIC itself, and typically connected to an I2C bus. Add a generic driver
to support said device.

Signed-off-by: Yassine Oudjana <y.oudjana@protonmail.com>
Co-developed-by: Kaustabh Chakraborty <kauschluss@disroot.org>
Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
Link: https://patch.msgid.link/20260304-s2mu005-fuelgauge-v3-2-e4dc4e47cde8@disroot.org
[Moved mutex init before power-supply registration]
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Yassine Oudjana
2026-03-04 22:33:56 +05:30
committed by Sebastian Reichel
parent d74b4fcc80
commit aa21327998
3 changed files with 319 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/power/supply/Kconfig
View File

@@ -229,6 +229,17 @@ config BATTERY_SAMSUNG_SDI
Say Y to enable support for Samsung SDI battery data.
These batteries are used in Samsung mobile phones.
config BATTERY_S2MU005
tristate "Samsung S2MU005 PMIC fuel gauge driver"
depends on I2C
select REGMAP_I2C
help
Say Y to enable support for the Samsung S2MU005 PMIC integrated
fuel gauge, which works indepenently of the PMIC battery charger
counterpart, and reports battery metrics.
This driver, if built as a module, will be called s2mu005-fuel-gauge.
config BATTERY_COLLIE
tristate "Sharp SL-5500 (collie) battery"
depends on SA1100_COLLIE && MCP_UCB1200

1
drivers/power/supply/Makefile
View File

@@ -40,6 +40,7 @@ obj-$(CONFIG_BATTERY_PMU) += pmu_battery.o
obj-$(CONFIG_BATTERY_QCOM_BATTMGR) += qcom_battmgr.o
obj-$(CONFIG_BATTERY_OLPC) += olpc_battery.o
obj-$(CONFIG_BATTERY_SAMSUNG_SDI) += samsung-sdi-battery.o
obj-$(CONFIG_BATTERY_S2MU005) += s2mu005-battery.o
obj-$(CONFIG_BATTERY_COLLIE) += collie_battery.o
obj-$(CONFIG_BATTERY_INGENIC) += ingenic-battery.o
obj-$(CONFIG_BATTERY_INTEL_DC_TI) += intel_dc_ti_battery.o

307
drivers/power/supply/s2mu005-battery.c Normal file
View File

@@ -0,0 +1,307 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Battery Fuel Gauge Driver for Samsung S2MU005 PMIC.
*
* Copyright (C) 2015 Samsung Electronics
* Copyright (C) 2023 Yassine Oudjana <y.oudjana@protonmail.com>
* Copyright (C) 2025 Kaustabh Chakraborty <kauschluss@disroot.org>
*/
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/mod_devicetable.h>
#include <linux/mutex.h>
#include <linux/power_supply.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/units.h>
#define S2MU005_FG_REG_STATUS 0x00
#define S2MU005_FG_REG_IRQ 0x02
#define S2MU005_FG_REG_RVBAT 0x04
#define S2MU005_FG_REG_RCURCC 0x06
#define S2MU005_FG_REG_RSOC 0x08
#define S2MU005_FG_REG_MONOUT 0x0a
#define S2MU005_FG_REG_MONOUTSEL 0x0c
#define S2MU005_FG_REG_RBATCAP 0x0e
#define S2MU005_FG_REG_RZADJ 0x12
#define S2MU005_FG_REG_RBATZ0 0x16
#define S2MU005_FG_REG_RBATZ1 0x18
#define S2MU005_FG_REG_IRQLVL 0x1a
#define S2MU005_FG_REG_START 0x1e
#define S2MU005_FG_MONOUTSEL_AVGCURRENT 0x26
#define S2MU005_FG_MONOUTSEL_AVGVOLTAGE 0x27
struct s2mu005_fg {
struct device *dev;
struct regmap *regmap;
struct power_supply *psy;
struct mutex monout_mutex;
};
static const struct regmap_config s2mu005_fg_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
.val_format_endian = REGMAP_ENDIAN_LITTLE,
};
static irqreturn_t s2mu005_handle_irq(int irq, void *data)
{
struct s2mu005_fg *priv = data;
msleep(100);
power_supply_changed(priv->psy);
return IRQ_HANDLED;
}
static int s2mu005_fg_get_voltage_now(struct s2mu005_fg *priv, int *value)
{
struct regmap *regmap = priv->regmap;
u32 val;
int ret;
ret = regmap_read(regmap, S2MU005_FG_REG_RVBAT, &val);
if (ret < 0) {
dev_err(priv->dev, "failed to read voltage register (%d)\n", ret);
return ret;
}
*value = (val * MICRO) >> 13;
return 0;
}
static int s2mu005_fg_get_voltage_avg(struct s2mu005_fg *priv, int *value)
{
struct regmap *regmap = priv->regmap;
u32 val;
int ret;
mutex_lock(&priv->monout_mutex);
ret = regmap_write(regmap, S2MU005_FG_REG_MONOUTSEL,
S2MU005_FG_MONOUTSEL_AVGVOLTAGE);
if (ret < 0) {
dev_err(priv->dev, "failed to enable average voltage monitoring (%d)\n",
ret);
goto unlock;
}
ret = regmap_read(regmap, S2MU005_FG_REG_MONOUT, &val);
if (ret < 0) {
dev_err(priv->dev, "failed to read current register (%d)\n", ret);
goto unlock;
}
*value = (val * MICRO) >> 12;
unlock:
mutex_unlock(&priv->monout_mutex);
return ret;
}
static int s2mu005_fg_get_current_now(struct s2mu005_fg *priv, int *value)
{
struct regmap *regmap = priv->regmap;
u32 val;
int ret;
ret = regmap_read(regmap, S2MU005_FG_REG_RCURCC, &val);
if (ret < 0) {
dev_err(priv->dev, "failed to read current register (%d)\n", ret);
return ret;
}
*value = -((s16)val * MICRO) >> 12;
return 0;
}
static int s2mu005_fg_get_current_avg(struct s2mu005_fg *priv, int *value)
{
struct regmap *regmap = priv->regmap;
u32 val;
int ret;
mutex_lock(&priv->monout_mutex);
ret = regmap_write(regmap, S2MU005_FG_REG_MONOUTSEL,
S2MU005_FG_MONOUTSEL_AVGCURRENT);
if (ret < 0) {
dev_err(priv->dev, "failed to enable average current monitoring (%d)\n",
ret);
goto unlock;
}
ret = regmap_read(regmap, S2MU005_FG_REG_MONOUT, &val);
if (ret < 0) {
dev_err(priv->dev, "failed to read current register (%d)\n", ret);
goto unlock;
}
*value = -((s16)val * MICRO) >> 12;
unlock:
mutex_unlock(&priv->monout_mutex);
return ret;
}
static int s2mu005_fg_get_capacity(struct s2mu005_fg *priv, int *value)
{
struct regmap *regmap = priv->regmap;
u32 val;
int ret;
ret = regmap_read(regmap, S2MU005_FG_REG_RSOC, &val);
if (ret < 0) {
dev_err(priv->dev, "failed to read capacity register (%d)\n", ret);
return ret;
}
*value = (val * CENTI) >> 14;
return 0;
}
static int s2mu005_fg_get_status(struct s2mu005_fg *priv, int *value)
{
int current_now, current_avg, capacity;
int ret;
ret = s2mu005_fg_get_current_now(priv, &current_now);
if (ret < 0)
return ret;
ret = s2mu005_fg_get_current_avg(priv, &current_avg);
if (ret < 0)
return ret;
/*
* Verify both current values reported to reduce inaccuracies due to
* internal hysteresis.
*/
if (current_now < 0 && current_avg < 0) {
*value = POWER_SUPPLY_STATUS_DISCHARGING;
} else if (current_now == 0) {
*value = POWER_SUPPLY_STATUS_NOT_CHARGING;
} else {
*value = POWER_SUPPLY_STATUS_CHARGING;
ret = s2mu005_fg_get_capacity(priv, &capacity);
if (!ret && capacity > 98)
*value = POWER_SUPPLY_STATUS_FULL;
return ret;
}
return 0;
}
static const enum power_supply_property s2mu005_fg_properties[] = {
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_AVG,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CURRENT_AVG,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_STATUS,
};
static int s2mu005_fg_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct s2mu005_fg *priv = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
return s2mu005_fg_get_voltage_now(priv, &val->intval);
case POWER_SUPPLY_PROP_VOLTAGE_AVG:
return s2mu005_fg_get_voltage_avg(priv, &val->intval);
case POWER_SUPPLY_PROP_CURRENT_NOW:
return s2mu005_fg_get_current_now(priv, &val->intval);
case POWER_SUPPLY_PROP_CURRENT_AVG:
return s2mu005_fg_get_current_avg(priv, &val->intval);
case POWER_SUPPLY_PROP_CAPACITY:
return s2mu005_fg_get_capacity(priv, &val->intval);
case POWER_SUPPLY_PROP_STATUS:
return s2mu005_fg_get_status(priv, &val->intval);
default:
return -EINVAL;
}
}
static const struct power_supply_desc s2mu005_fg_desc = {
.name = "s2mu005-fuel-gauge",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = s2mu005_fg_properties,
.num_properties = ARRAY_SIZE(s2mu005_fg_properties),
.get_property = s2mu005_fg_get_property,
};
static int s2mu005_fg_i2c_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct s2mu005_fg *priv;
struct power_supply_config psy_cfg = {};
const struct power_supply_desc *psy_desc;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
dev_set_drvdata(dev, priv);
priv->dev = dev;
priv->regmap = devm_regmap_init_i2c(client, &s2mu005_fg_regmap_config);
if (IS_ERR(priv->regmap))
return dev_err_probe(dev, PTR_ERR(priv->regmap),
"failed to initialize regmap\n");
ret = devm_mutex_init(dev, &priv->monout_mutex);
if (ret)
dev_err_probe(dev, ret, "failed to initialize MONOUT mutex\n");
psy_desc = device_get_match_data(dev);
psy_cfg.drv_data = priv;
psy_cfg.fwnode = dev_fwnode(dev);
priv->psy = devm_power_supply_register(priv->dev, psy_desc, &psy_cfg);
if (IS_ERR(priv->psy))
return dev_err_probe(dev, PTR_ERR(priv->psy),
"failed to register power supply subsystem\n");
ret = devm_request_threaded_irq(priv->dev, client->irq, NULL,
s2mu005_handle_irq, IRQF_ONESHOT,
psy_desc->name, priv);
if (ret)
dev_err_probe(dev, ret, "failed to request IRQ\n");
return 0;
}
static const struct of_device_id s2mu005_fg_of_match_table[] = {
{
.compatible = "samsung,s2mu005-fuel-gauge",
.data = &s2mu005_fg_desc,
},
{ }
};
MODULE_DEVICE_TABLE(of, s2mu005_fg_of_match_table);
static struct i2c_driver s2mu005_fg_i2c_driver = {
.probe = s2mu005_fg_i2c_probe,
.driver = {
.name = "s2mu005-fuel-gauge",
.of_match_table = s2mu005_fg_of_match_table,
},
};
module_i2c_driver(s2mu005_fg_i2c_driver);
MODULE_DESCRIPTION("Samsung S2MU005 PMIC Battery Fuel Gauge Driver");
MODULE_AUTHOR("Yassine Oudjana <y.oudjana@protonmail.com>");
MODULE_AUTHOR("Kaustabh Chakraborty <kauschluss@disroot.org>");
MODULE_LICENSE("GPL");