diff options
| author | Josef Gajdusek <atx@atx.name> | 2014-06-17 23:15:49 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-07-07 23:37:06 +0200 |
| commit | 232de514379082e7ec431c66c9713a6ef23d5dcb (patch) | |
| tree | a66ce250f7260efc070edf9ff9512eaf03d44f81 | |
| parent | 75646e758a0ecbed5024454507d5be5b9ea9dcbf (diff) | |
| download | lwn-232de514379082e7ec431c66c9713a6ef23d5dcb.tar.gz lwn-232de514379082e7ec431c66c9713a6ef23d5dcb.zip | |
ACPI / battery: fix wrong value of capacity_now reported when fully charged
It seems that some batteries (noticed on DELL JYPJ136) assume
capacity_now = design_capacity when fully charged. This causes
reported capacity to suddenly jump to >full_charge_capacity (and that
means capacity reported to userspace is >100% and incorrect)
values after 99%. This patch detects capacity_now > full_charge_capacity,
notifies userspace (unless it is the known bug where capacity_now ==
design_capacity) and trims the value to full_charge_capacity.
Signed-off-by: Josef Gajdusek <atx@atx.name>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/acpi/battery.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c index bc0b286ff2ba..130f513e08c9 100644 --- a/drivers/acpi/battery.c +++ b/drivers/acpi/battery.c @@ -535,6 +535,20 @@ static int acpi_battery_get_state(struct acpi_battery *battery) " invalid.\n"); } + /* + * When fully charged, some batteries wrongly report + * capacity_now = design_capacity instead of = full_charge_capacity + */ + if (battery->capacity_now > battery->full_charge_capacity + && battery->full_charge_capacity != ACPI_BATTERY_VALUE_UNKNOWN) { + battery->capacity_now = battery->full_charge_capacity; + if (battery->capacity_now != battery->design_capacity) + printk_once(KERN_WARNING FW_BUG + "battery: reported current charge level (%d) " + "is higher than reported maximum charge level (%d).\n", + battery->capacity_now, battery->full_charge_capacity); + } + if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags) && battery->capacity_now >= 0 && battery->capacity_now <= 100) battery->capacity_now = (battery->capacity_now * |