ACPI: battery: add power_{now,avg} properties to power_class

ACPI has smart batteries, which work in units of energy and measure
rate of (dis)charge as power, thus it is not appropriate to export it
as a current_now. Current_now will still be exported to allow
for userland applications to match.

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/battery.c

@@ -92,7 +92,7 @@ struct acpi_battery {
 #endif
 	struct acpi_device *device;
 	unsigned long update_time;
-	int current_now;
+	int rate_now;
 	int capacity_now;
 	int voltage_now;
 	int design_capacity;
@@ -196,7 +196,8 @@ static int acpi_battery_get_property(struct power_supply *psy,
 		val->intval = battery->voltage_now * 1000;
 		break;
 	case POWER_SUPPLY_PROP_CURRENT_NOW:
-		val->intval = battery->current_now * 1000;
+	case POWER_SUPPLY_PROP_POWER_NOW:
+		val->intval = battery->rate_now * 1000;
 		break;
 	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
@@ -247,6 +248,7 @@ static enum power_supply_property energy_battery_props[] = {
 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 	POWER_SUPPLY_PROP_CURRENT_NOW,
+	POWER_SUPPLY_PROP_POWER_NOW,
 	POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 	POWER_SUPPLY_PROP_ENERGY_FULL,
 	POWER_SUPPLY_PROP_ENERGY_NOW,
@@ -273,7 +275,7 @@ struct acpi_offsets {
 
 static struct acpi_offsets state_offsets[] = {
 	{offsetof(struct acpi_battery, state), 0},
-	{offsetof(struct acpi_battery, current_now), 0},
+	{offsetof(struct acpi_battery, rate_now), 0},
 	{offsetof(struct acpi_battery, capacity_now), 0},
 	{offsetof(struct acpi_battery, voltage_now), 0},
 };
@@ -605,11 +607,11 @@ static int acpi_battery_print_state(struct seq_file *seq, int result)
 	else
 		seq_printf(seq, "charging state:          charged\n");
 
-	if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
+	if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 		seq_printf(seq, "present rate:            unknown\n");
 	else
 		seq_printf(seq, "present rate:            %d %s\n",
-			   battery->current_now, acpi_battery_units(battery));
+			   battery->rate_now, acpi_battery_units(battery));
 
 	if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 		seq_printf(seq, "remaining capacity:      unknown\n");