Main and Dock batteries for Asus TF101

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Please, add support for Asus TF101 batteries.

There are 2 batteries, one in the tablet itself and another one in the dock.
For the main battery, %charge shown in the settings pop-up, but there is
nothing that shows dock battery state.

There is no sysfs file to show you current, but there is information about dock
battery:

/sys/class/power_supply/dock_battery/capacity

gives %charge.
In same directory, file

status

reads Charging/Not charging/Full

For the main battery,

/sys/class/power_supply/battery/

have usual set of files

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Original issue reported on code.google.com by `vladimir...@gmail.com` on 24 Jun 2011 at 9:08