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Commit a20136a6 authored by Laszlo Toth's avatar Laszlo Toth Committed by Rafael J. Wysocki
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ACPI: battery: do not export degraded capacity values over 100 



With a degraded battery, full_charge_capacity can be less
than design_capacity, however it's not sure that capacity_now's
max will follow.

Example from an affected machine:
/sys/class/power_supply/BAT0/charge_full        -> 4290000
/sys/class/power_supply/BAT0/charge_full_design -> 5900000
/sys/class/power_supply/BAT0/charge_now         -> 5900000
/sys/class/power_supply/BAT0/capacity           -> 137

The battery is a degraded one with a full charge, and
charge_now is the value of charge_full_design instead of
charge_full.

Added a new quirk to test and correct this, and
a new function to check if the battery is a degraded one
or not. This keeps the possibility to be over 100 if
it's really the case.

Signed-off-by: default avatarLaszlo Toth <laszlth@gmail.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 514bcc5d

drivers/acpi/battery.c

+27 −0
Original line number Diff line number Diff line
@@ -121,6 +121,10 @@ enum { 
	   post-1.29 BIOS), but as of Nov. 2012, no such update is

	   available for the 2010 models.  */

	ACPI_BATTERY_QUIRK_THINKPAD_MAH,

	/* for batteries reporting current capacity with design capacity

	 * on a full charge, but showing degradation in full charge cap.

	 */

	ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE,

};



struct acpi_battery {
@@ -207,6 +211,12 @@ static int acpi_battery_is_charged(struct acpi_battery *battery) 
	return 0;

}



static bool acpi_battery_is_degraded(struct acpi_battery *battery)

{

	return battery->full_charge_capacity && battery->design_capacity &&

		battery->full_charge_capacity < battery->design_capacity;

}



static int acpi_battery_get_property(struct power_supply *psy,

				     enum power_supply_property psp,

				     union power_supply_propval *val)
@@ -483,6 +493,10 @@ static int extract_battery_info(const int use_bix, 
		   it's impossible to tell if they would need an adjustment

		   or not if their values were higher.  */

	}

	if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&

	    battery->capacity_now > battery->full_charge_capacity)

		battery->capacity_now = battery->full_charge_capacity;



	return result;

}
@@ -575,6 +589,10 @@ static int acpi_battery_get_state(struct acpi_battery *battery) 
		battery->capacity_now = battery->capacity_now *

		    10000 / battery->design_voltage;

	}

	if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&

	    battery->capacity_now > battery->full_charge_capacity)

		battery->capacity_now = battery->full_charge_capacity;



	return result;

}
@@ -885,6 +903,15 @@ static void acpi_battery_quirks(struct acpi_battery *battery) 
			}

		}

	}



	if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))

		return;



	if (acpi_battery_is_degraded(battery) &&

	    battery->capacity_now > battery->full_charge_capacity) {

		set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);

		battery->capacity_now = battery->full_charge_capacity;

	}

}



static int acpi_battery_update(struct acpi_battery *battery, bool resume)