battery: Add support for hot-removal

In cases of hot-removal, further communication with the device should be
avoided whenever possible, as it may fail and time out.

Signed-off-by: Maximilian Luz <[email protected]>

Author: qzed

module/src/clients/surface_battery.c

@@ -156,6 +156,9 @@ static bool spwr_battery_present(struct spwr_battery_device *bat)
 {
 	lockdep_assert_held(&bat->lock);
 
+	if (ssam_device_is_hot_removed(bat->sdev))
+		return false;
+
 	return le32_to_cpu(bat->sta) & SAM_BATTERY_STA_PRESENT;
 }
 
@@ -245,6 +248,9 @@ static int spwr_battery_update_bix_unlocked(struct spwr_battery_device *bat)
 
 	lockdep_assert_held(&bat->lock);
 
+	if (ssam_device_is_hot_removed(bat->sdev))
+		return 0;
+
 	status = spwr_battery_load_sta(bat);
 	if (status)
 		return status;