ACPI: battery: Round capacity percengate to closest integer

JIRA: https://issues.redhat.com/browse/RHEL-114091

commit 46d839a
Author: shitao <shitao@kylinos.cn>
Date: Wed, 09 Apr 2025 15:56:19 +0000

If the difference between capacity_now and full_capacity is
within 0.5%, 100% is arguably a better number to expose than
99% and exposing the latter may confuse the user to think that
there's something wrong with the battery.

Round the capacity percentage to the closest integer value to
avoid the confusion.

Signed-off-by: shitao  <shitao@kylinos.cn>
Link: https://patch.msgid.link/20250407085419.494234-1-shitao@kylinos.cn
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Mark Langsdorf <mlangsdo@redhat.com>

Author: mlangsdorf

drivers/acpi/battery.c

@@ -279,8 +279,8 @@ static int acpi_battery_get_property(struct power_supply *psy,
 		    full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 			ret = -ENODEV;
 		else
-			val->intval = battery->capacity_now * 100/
-					full_capacity;
+			val->intval = DIV_ROUND_CLOSEST_ULL(battery->capacity_now * 100ULL,
+					full_capacity);
 		break;
 	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
 		if (battery->state & ACPI_BATTERY_STATE_CRITICAL)