[PATCH v4 2/8] power: supply: core: Add state_of_health power supply property

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

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

Add state_of_health power supply property to represent battery
health percentage.

Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on Thinkpad T14S OLED
Signed-off-by: Fenglin Wu <fenglin.wu@oss.qualcomm.com>
---
Documentation/ABI/testing/sysfs-class-power | 15 +++++++++++++++
drivers/power/supply/power_supply_sysfs.c | 1 +
include/linux/power_supply.h | 1 +
3 files changed, 17 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-class-power b/Documentation/ABI/testing/sysfs-class-power
index cea1a38f5a8fb754d4e6323967ef6cf2e20a68ce..04f82e3e33aad6e16dc4fbace066b5d26069bf44 100644
--- a/Documentation/ABI/testing/sysfs-class-power
+++ b/Documentation/ABI/testing/sysfs-class-power
@@ -568,6 +568,21 @@ Description:

Valid values: Represented in microohms

+What: /sys/class/power_supply/<supply_name>/state_of_health
+Date: August 2025
+Contact: linux-arm-msm@vger.kernel.org
+Description:
+ The state_of_health parameter quantifies the overall condition
+ of a battery as a percentage, reflecting its ability to deliver
+ rated performance relative to its original specifications. It is
+ dynamically computed using a combination of learned capacity
+ and impedance-based degradation indicators, both of which evolve
+ over the battery's lifecycle.
+
+ Access: Read
+
+ Valid values: 0 - 100 (percent)
+
**USB Properties**

What: /sys/class/power_supply/<supply_name>/input_current_limit
diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
index cfa8f90a88ebc8fc1c7447198f138e5d2e699e5a..d96a8578308e3af60cc1a352845662aa922c29b3 100644
--- a/drivers/power/supply/power_supply_sysfs.c
+++ b/drivers/power/supply/power_supply_sysfs.c
@@ -221,6 +221,7 @@ static struct power_supply_attr power_supply_attrs[] __ro_after_init = {
POWER_SUPPLY_ATTR(MANUFACTURE_MONTH),
POWER_SUPPLY_ATTR(MANUFACTURE_DAY),
POWER_SUPPLY_ATTR(INTERNAL_RESISTANCE),
+ POWER_SUPPLY_ATTR(STATE_OF_HEALTH),
/* Properties of type `const char *' */
POWER_SUPPLY_ATTR(MODEL_NAME),
POWER_SUPPLY_ATTR(MANUFACTURER),
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 8bc3b7a67eb5693a16db9b7d123e7881711c6bf4..ccb43fe44381965069dc3bd9505d45050b9b1bd8 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -175,6 +175,7 @@ enum power_supply_property {
POWER_SUPPLY_PROP_MANUFACTURE_MONTH,
POWER_SUPPLY_PROP_MANUFACTURE_DAY,
POWER_SUPPLY_PROP_INTERNAL_RESISTANCE,
+ POWER_SUPPLY_PROP_STATE_OF_HEALTH,
/* Properties of type `const char *' */
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER,

--
2.34.1