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ACPI battery: support percentage battery remaining capacity

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According to the ACPI spec, some kinds of primary battery can
report percentage battery remaining capacity directly to OS.

In this case, it reports the LastFullChargedCapacity == 100,
BatteryPresentRate = 0xFFFFFFFF, and BatteryRemaingCapacity a
percentage value, which actually means RemainingBatteryPercentage.

Now we found some battery follows this rule even if it's a rechargeable.
https://bugzilla.kernel.org/show_bug.cgi?id=15979

Handle these batteries correctly in ACPI battery driver
so that they won't break userspace.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: Sitsofe Wheeler <sitsofe@yahoo.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Zhang Rui 2010-10-22 10:02:06 +08:00 committed by Len Brown
parent 03e7c3432d
commit 557d58687d
1 changed files with 37 additions and 1 deletions
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38
drivers/acpi/battery.c
View file

@ -95,6 +95,7 @@ enum {
* due to bad math.
*/
ACPI_BATTERY_QUIRK_SIGNED16_CURRENT,
ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
};
struct acpi_battery {
@ -405,6 +406,8 @@ static int acpi_battery_get_info(struct acpi_battery *battery)
result = extract_package(battery, buffer.pointer,
info_offsets, ARRAY_SIZE(info_offsets));
kfree(buffer.pointer);
if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
battery->full_charge_capacity = battery->design_capacity;
return result;
}
@ -441,6 +444,10 @@ static int acpi_battery_get_state(struct acpi_battery *battery)
battery->rate_now != -1)
battery->rate_now = abs((s16)battery->rate_now);
if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
&& battery->capacity_now >= 0 && battery->capacity_now <= 100)
battery->capacity_now = (battery->capacity_now *
battery->full_charge_capacity) / 100;
return result;
}
@ -552,6 +559,33 @@ static void acpi_battery_quirks(struct acpi_battery *battery)
}
}
/*
* According to the ACPI spec, some kinds of primary batteries can
* report percentage battery remaining capacity directly to OS.
* In this case, it reports the Last Full Charged Capacity == 100
* and BatteryPresentRate == 0xFFFFFFFF.
*
* Now we found some battery reports percentage remaining capacity
* even if it's rechargeable.
* https://bugzilla.kernel.org/show_bug.cgi?id=15979
*
* Handle this correctly so that they won't break userspace.
*/
static void acpi_battery_quirks2(struct acpi_battery *battery)
{
if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
return ;
if (battery->full_charge_capacity == 100 &&
battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
battery->capacity_now >=0 && battery->capacity_now <= 100) {
set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
battery->full_charge_capacity = battery->design_capacity;
battery->capacity_now = (battery->capacity_now *
battery->full_charge_capacity) / 100;
}
}
static int acpi_battery_update(struct acpi_battery *battery)
{
int result, old_present = acpi_battery_present(battery);
@ -573,7 +607,9 @@ static int acpi_battery_update(struct acpi_battery *battery)
}
if (!battery->bat.dev)
sysfs_add_battery(battery);
return acpi_battery_get_state(battery);
result = acpi_battery_get_state(battery);
acpi_battery_quirks2(battery);
return result;
}
/* --------------------------------------------------------------------------