[patch] addon-hid-ups.c : battery.present is mandatory for HAL spec

[Pierre Ossman]

Richard Hughes wrote:
> According to the HAL spec, battery.present is compulsory for devices
> that have capability battery.
> 
> Whilst programming the tooltip logic for Power Manager, I noticed that
> battery.present is never set for my UPS. It makes no sense to have a UPS
> without a battery (you can't hot-change the batteries...) so this
> parameter should be hard-coded.
> 
> 

Even though I've never seen a UPS capable of hot-swapping the batteries,
I don't see why that wouldn't be possible. :)
Could be useful on high-reliability systems.

As for the usefulness of an UPS without battery. They are usually pretty
good filters for line noise. But you normally keep the batteries in them
even if they're crappy in those cases.

Just my $.02

Rgds
Pierre
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