[PATCH] ACPI: battery: fix incorrect charging status when current is zero

["Ata İlhan Köktürk" <atailhan2006@gmail.com>]

On some laptops, such as the Huawei Matebook series
the Embedded Controller continues to report "Charging"
status even when the charge threshold is
reached and no current is being drawn.

This incorrect reporting prevents the
system from switching to battery
power profiles, leading to significantly
higher power consumption (e.g., 18W
instead of 7W during browsing) and
broken battery remaining time estimation.

Validate the "Charging" state
by checking if rate_now is zero. If the
hardware reports charging but the current is zero,
report "Not Charging" to user space.

Signed-off-by: Ata İlhan Köktürk <atailhan2006@gmail.com>
---
 drivers/acpi/battery.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 34181fa52..b4ba8085f 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -211,7 +211,13 @@ static int acpi_battery_get_property(struct power_supply *psy,
 		if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
 			val->intval = acpi_battery_handle_discharging(battery);
 		else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
-			val->intval = POWER_SUPPLY_STATUS_CHARGING;
+			/* Check if we can fetch ACPI current info */
+			if (battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
+				battery->rate_now == 0)
+				/* On charge but no current (0W/0mA) */
+				val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+			else
+				val->intval = POWER_SUPPLY_STATUS_CHARGING;
 		else if (battery->state & ACPI_BATTERY_STATE_CHARGE_LIMITING)
 			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 		else if (acpi_battery_is_charged(battery))
-- 
2.43.0