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ACPI: battery: do not export degraded capacity values over 100

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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: Laszlo Toth <laszlth@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Laszlo Toth 2018-02-24 10:20:15 +01:00 committed by Rafael J. Wysocki
parent 514bcc5dfa
commit a20136a67a
1 changed files with 27 additions and 0 deletions
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27
drivers/acpi/battery.c
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@ -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)