Add a property for reporting the error margin expected
by fuel gauge chips.
Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>
---
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 bf3b48f022dc..2f896555ae23 100644
--- a/Documentation/ABI/testing/sysfs-class-power
+++ b/Documentation/ABI/testing/sysfs-class-power
@@ -74,6 +74,21 @@ Description:
Access: Read, Write
Valid values: 0 - 100 (percent)
+What: /sys/class/power_supply/<supply_name>/capacity_error_margin
+Date: April 2019
+Contact: linux-pm@xxxxxxxxxxxxxxx
+Description:
+ Battery capacity measurement becomes unreliable without
+ recalibration. This values provides the maximum error
+ margin expected to exist by the fuel gauge in percent.
+ Values close to 0% will be returned after (re-)calibration
+ has happened. Over time the error margin will increase.
+ 100% means, that the capacity related values are basically
+ completely useless.
+
+ Access: Read
+ Valid values: 0 - 100 (percent)
+
What: /sys/class/power_supply/<supply_name>/capacity_level
Date: June 2009
Contact: linux-pm@xxxxxxxxxxxxxxx
diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
index d21b4e0edf38..e664774a2d1e 100644
--- a/drivers/power/supply/power_supply_sysfs.c
+++ b/drivers/power/supply/power_supply_sysfs.c
@@ -178,6 +178,7 @@ static struct power_supply_attr power_supply_attrs[] = {
POWER_SUPPLY_ATTR(CAPACITY),
POWER_SUPPLY_ATTR(CAPACITY_ALERT_MIN),
POWER_SUPPLY_ATTR(CAPACITY_ALERT_MAX),
+ POWER_SUPPLY_ATTR(CAPACITY_ERROR_MARGIN),
POWER_SUPPLY_ENUM_ATTR(CAPACITY_LEVEL),
POWER_SUPPLY_ATTR(TEMP),
POWER_SUPPLY_ATTR(TEMP_MAX),
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 1f60731ec7fe..453a85f25635 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -139,6 +139,7 @@ enum power_supply_property {
POWER_SUPPLY_PROP_CAPACITY, /* in percents! */
POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN, /* in percents! */
POWER_SUPPLY_PROP_CAPACITY_ALERT_MAX, /* in percents! */
+ POWER_SUPPLY_PROP_CAPACITY_ERROR_MARGIN, /* in percents! */
POWER_SUPPLY_PROP_CAPACITY_LEVEL,
POWER_SUPPLY_PROP_TEMP,
POWER_SUPPLY_PROP_TEMP_MAX,
--
2.26.2
