Re: [PATCH 3/3] ACPI: battery: register power_supply subdevice even when battery not present

[Alan Jenkins <alan-jenkins@tuffmail.co.uk>]

Maxim Levitsky wrote:
> On Tue, 2009-05-12 at 15:51 +0100, Alan Jenkins wrote:
>   
>> Keeping this device around lets userspace know that we have a battery
>> bay, even if there is nothing in it at the moment.  This is what every
>> other battery driver does, so ACPI should do it as well.
>>
>> There is no reason to preserve the old behaviour.  We now correctly
>> provide the "present" attribute, which will return "0" when the battery
>> is removed.  HAL was already trying to check this attribute, so
>> it should be fine.
>>
>> Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
>>     
>
> What happened to this patch?
>
> I still get the issue this patch attempts to fix:
>
> maxim@maxim-laptop:~/software/kernel/linux-2.6$
> ls /sys/class/power_supply/
> AC
> maxim@maxim-laptop:~/software/kernel/linux-2.6$
> ls /sys/class/power_supply/
> AC  BAT0
> maxim@maxim-laptop:~/software/kernel/linux-2.6$
> ls /sys/class/power_supply/
> AC
> maxim@maxim-laptop:~/software/kernel/linux-2.6$ uname -r
> 2.6.31-rc8-next-20090904-next
> maxim@maxim-laptop:~/software/kernel/linux-2.6$ 
>
>
> When I unplug the battery, its sysfs entry disappears.
> Thus if system was booted without battery, there will be no way to know
> system has one.
>
> This patch doesn't apply.
>   

I rebased these patches a while back

http://patchwork.kernel.org/patch/33118/
http://patchwork.kernel.org/patch/33119/
http://patchwork.kernel.org/patch/33120/

you should find these will still apply.

Regards
Alan