[PATCH v4 3/8] power: supply: qcom_battmgr: Add resistance power supply property

Fenglin Wu via B4 Relay
2025-09-15T08:50:14Z

From: Fenglin Wu <fenglin.wu@oss.qualcomm.com>

Add power supply property to get battery internal resistance from
the battery management firmware.

Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on Thinkpad T14S OLED
Signed-off-by: Fenglin Wu <fenglin.wu@oss.qualcomm.com>
---
drivers/power/supply/qcom_battmgr.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/drivers/power/supply/qcom_battmgr.c b/drivers/power/supply/qcom_battmgr.c
index fe27676fbc7cd12292caa6fb3b5b46a18c426e6d..55477ae92fd56ede465b32d6f7ed9da78ebd869c 100644
--- a/drivers/power/supply/qcom_battmgr.c
+++ b/drivers/power/supply/qcom_battmgr.c
@@ -2,6 +2,7 @@
/*
* Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
* Copyright (c) 2022, Linaro Ltd
+ * Copyright (c) 2025 Qualcomm Innovation Center, Inc. All rights reserved.
*/
#include <linux/auxiliary_bus.h>
#include <linux/module.h>
@@ -254,6 +255,7 @@ struct qcom_battmgr_status {
unsigned int voltage_now;
unsigned int voltage_ocv;
unsigned int temperature;
+ unsigned int resistance;

unsigned int discharge_time;
unsigned int charge_time;
@@ -418,6 +420,7 @@ static const u8 sm8350_bat_prop_map[] = {
[POWER_SUPPLY_PROP_MODEL_NAME] = BATT_MODEL_NAME,
[POWER_SUPPLY_PROP_TIME_TO_FULL_AVG] = BATT_TTF_AVG,
[POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG] = BATT_TTE_AVG,
+ [POWER_SUPPLY_PROP_INTERNAL_RESISTANCE] = BATT_RESISTANCE,
[POWER_SUPPLY_PROP_POWER_NOW] = BATT_POWER_NOW,
};

@@ -582,6 +585,9 @@ static int qcom_battmgr_bat_get_property(struct power_supply *psy,
case POWER_SUPPLY_PROP_TEMP:
val->intval = battmgr->status.temperature;
break;
+ case POWER_SUPPLY_PROP_INTERNAL_RESISTANCE:
+ val->intval = battmgr->status.resistance;
+ break;
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
val->intval = battmgr->status.discharge_time;
break;
@@ -665,6 +671,7 @@ static const enum power_supply_property sm8350_bat_props[] = {
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
+ POWER_SUPPLY_PROP_INTERNAL_RESISTANCE,
POWER_SUPPLY_PROP_POWER_NOW,
};

@@ -1174,6 +1181,9 @@ static void qcom_battmgr_sm8350_callback(struct qcom_battmgr *battmgr,
case BATT_TTE_AVG:
battmgr->status.discharge_time = le32_to_cpu(resp->intval.value);
break;
+ case BATT_RESISTANCE:
+ battmgr->status.resistance = le32_to_cpu(resp->intval.value);
+ break;
case BATT_POWER_NOW:
battmgr->status.power_now = le32_to_cpu(resp->intval.value);
break;

--
2.34.1