6.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Thomas Antoine t.antoine@uclouvain.be
[ Upstream commit 58ae036172b5f051a19a32eba94a3e5eb37bf47e ]
From the datasheet of the MAX17201/17205, the LSB should be "5.0μVh/RSENSE".
The current computation sets it at 0.5mAh=5.0μVh/10mOhm, which does not take into account the value of rsense (which is in 10µV steps) which can be different from 10mOhm.
Change the computation to fit the specs.
Fixes: 479b6d04964b ("power: supply: add support for MAX1720x standalone fuel gauge") Signed-off-by: Thomas Antoine t.antoine@uclouvain.be Link: https://lore.kernel.org/r/20250523-b4-gs101_max77759_fg-v4-1-b49904e35a34@uc... Signed-off-by: Sebastian Reichel sebastian.reichel@collabora.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/power/supply/max1720x_battery.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/power/supply/max1720x_battery.c b/drivers/power/supply/max1720x_battery.c index ea3912fd1de8..68b5314ecf3a 100644 --- a/drivers/power/supply/max1720x_battery.c +++ b/drivers/power/supply/max1720x_battery.c @@ -288,9 +288,10 @@ static int max172xx_voltage_to_ps(unsigned int reg) return reg * 1250; /* in uV */ }
-static int max172xx_capacity_to_ps(unsigned int reg) +static int max172xx_capacity_to_ps(unsigned int reg, + struct max1720x_device_info *info) { - return reg * 500; /* in uAh */ + return reg * (500000 / info->rsense); /* in uAh */ }
/* @@ -394,11 +395,11 @@ static int max1720x_battery_get_property(struct power_supply *psy, break; case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: ret = regmap_read(info->regmap, MAX172XX_DESIGN_CAP, ®_val); - val->intval = max172xx_capacity_to_ps(reg_val); + val->intval = max172xx_capacity_to_ps(reg_val, info); break; case POWER_SUPPLY_PROP_CHARGE_AVG: ret = regmap_read(info->regmap, MAX172XX_REPCAP, ®_val); - val->intval = max172xx_capacity_to_ps(reg_val); + val->intval = max172xx_capacity_to_ps(reg_val, info); break; case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: ret = regmap_read(info->regmap, MAX172XX_TTE, ®_val); @@ -422,7 +423,7 @@ static int max1720x_battery_get_property(struct power_supply *psy, break; case POWER_SUPPLY_PROP_CHARGE_FULL: ret = regmap_read(info->regmap, MAX172XX_FULL_CAP, ®_val); - val->intval = max172xx_capacity_to_ps(reg_val); + val->intval = max172xx_capacity_to_ps(reg_val, info); break; case POWER_SUPPLY_PROP_MODEL_NAME: ret = regmap_read(info->regmap, MAX172XX_DEV_NAME, ®_val);