onBatteryPower

[Richard Hughes]

On Wed, 2005-10-26 at 17:32 +0200, Danny Kukawka wrote:
> On Wednesday 26 October 2005 17:18, Richard Hughes wrote:
> > How about a key /devices/computer:onBatteryPower which could be
> > set/cleared by each of the acpi, apm, pmu modules?
> >
> > A system service (e.g. updatedb) would then find the value of this key
> > before starting it's progress.
> >
> > And g-p-m could be made a *whole lot* simpler and not have to cache the
> > batteries and ac_adaptors in a complicated caching structure.
> >
> > We would need to add a small lump of code to each addon to change this
> > key.
> >
> > Good idea/bad idea?
> >
> > One key,
> 
> We have already a key for this: ac_adapter.present.

Could we just copy this key to a computer node so we don't have to find
all devices with capability "ac_adapter"?

We want to make the "glue" bit that queries hal as simple as possibly,
hopefully just reading one key.

>  This should work with 
> laptop and workstation for ACPI/APM and PMU.

Point taken.

>  At least you could also check 
> battery.rechargeable.is_discharging to detect if run on battery.

What about multiple batteries? We would have to check each one.

> I think we don't need one more key, if there is already one.

See above, but I do see your point.

Richard.