On Tuesday, June 17, 2014 10:14:00 PM Josef Gajdusek wrote:
> 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 attempts to detect this bug, notifies
> userspace and trims the value to full_charge_capacity.
>
> Signed-off-by: Josef Gajdusek <atx@xxxxxxxx>
> ---
> >
> > But it still is necessary to check if battery->full_charge_capacity is
> > not ACPI_BATTERY_VALUE_UNKNOWN, isn't it?
> >
>
> Fixed, my mistake. When changing the checks, I somehow missed that the values
> are not unsigned.
>
> diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
> index e48fc98..2e8f699 100644
> --- a/drivers/acpi/battery.c
> +++ b/drivers/acpi/battery.c
> @@ -532,6 +532,19 @@ 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;
Thinking more about the printk_once(). Perhaps it only needs to be printed
when battery->capacity_now != battery->design_capacity (it's a known issue
otherwise).
> + printk_once(KERN_WARNING FW_BUG
> + "battery: reported current charge level (%d) "
> + "is higher than reported maximum charge level (%d)."
> + "This is normal on some systems.\n",
Also I think that the line above doesn't add any real value. :-)
> + 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 *
>
> --
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--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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