[PATCH 6.6.y] power: supply: qcom_battmgr: Notify charger supplies of online changes

[Sasha Levin <sashal@kernel.org>]

From: Brandon Williams <turbine.bmw@gmail.com>

[ Upstream commit 87fd20da8ca8bacdaa9bff5860167f208077dc51 ]

On SC8280XP and X1E80100 the AC, USB and wireless supplies take their
online state from the charging source in the battery status response.
The firmware sends no notification for those supplies when the charging
source changes, and the driver only announces the battery, so userspace
never learns that the charger was plugged in or out. UPower keeps the
state it read at startup: a laptop booted on the charger never goes on
battery.

Call power_supply_changed() for a supply whose online state changes when
a status response is parsed. A supply that is not registered yet, when
the battery is read during probe, reports its state when it registers.

Tested on a Microsoft Surface Pro 11 (X1E80100): after restarting UPower
on the charger, unplugging now sets OnBattery, and plugging in clears it.

Fixes: 29e8142b5623 ("power: supply: Introduce Qualcomm PMIC GLINK power supply")
Cc: stable@vger.kernel.org
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: Brandon Williams <turbine.bmw@gmail.com>
Link: https://patch.msgid.link/20261013-upstream-battmgr-charger-online-v1-1-731973e133a0@gmail.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
[ sashal: adjusted callback context because the last_full_capacity block is absent ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/power/supply/qcom_battmgr.c | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/power/supply/qcom_battmgr.c b/drivers/power/supply/qcom_battmgr.c
index 7b51f827c34cd..65140d4985af1 100644
--- a/drivers/power/supply/qcom_battmgr.c
+++ b/drivers/power/supply/qcom_battmgr.c
@@ -995,6 +995,23 @@ static unsigned int qcom_battmgr_sc8280xp_convert_temp(unsigned int temperature)
 	return DIV_ROUND_CLOSEST(temperature, 10);
 }
 
+/*
+ * The charger supplies' online state comes from the battery status response,
+ * and the firmware sends no notification of its own when it changes, so
+ * announce the change here. A supply that is not registered yet announces its
+ * state when it is.
+ */
+static void qcom_battmgr_sc8280xp_set_online(struct power_supply *psy,
+					     bool *online, bool value)
+{
+	if (*online == value)
+		return;
+
+	*online = value;
+	if (psy)
+		power_supply_changed(psy);
+}
+
 static void qcom_battmgr_sc8280xp_callback(struct qcom_battmgr *battmgr,
 					   const struct qcom_battmgr_message *resp,
 					   size_t len)
@@ -1062,9 +1079,12 @@ static void qcom_battmgr_sc8280xp_callback(struct qcom_battmgr *battmgr,
 		battmgr->status.temperature = qcom_battmgr_sc8280xp_convert_temp(le32_to_cpu(resp->status.temperature));
 
 		source = le32_to_cpu(resp->status.charging_source);
-		battmgr->ac.online = source == BATTMGR_CHARGING_SOURCE_AC;
-		battmgr->usb.online = source == BATTMGR_CHARGING_SOURCE_USB;
-		battmgr->wireless.online = source == BATTMGR_CHARGING_SOURCE_WIRELESS;
+		qcom_battmgr_sc8280xp_set_online(battmgr->ac_psy, &battmgr->ac.online,
+						 source == BATTMGR_CHARGING_SOURCE_AC);
+		qcom_battmgr_sc8280xp_set_online(battmgr->usb_psy, &battmgr->usb.online,
+						 source == BATTMGR_CHARGING_SOURCE_USB);
+		qcom_battmgr_sc8280xp_set_online(battmgr->wls_psy, &battmgr->wireless.online,
+						 source == BATTMGR_CHARGING_SOURCE_WIRELESS);
 		break;
 	case BATTMGR_BAT_DISCHARGE_TIME:
 		battmgr->status.discharge_time = le32_to_cpu(resp->time);
-- 
2.53.0