tree 98f85a9921254a670904652bdf10205a5b1a149a
parent 8fac1722140019d6a53f7b280f8b785707a16f66
author Jason Gerecke <killertofu@gmail.com> 1426094741 -0700
committer Jiri Kosina <jkosina@suse.cz> 1426096204 -0400

HID: wacom: Add battery presence indicator to wireless tablets

Declare the POWER_SUPPLY_PROP_PRESENT property to provide userspace
with a way to determine if the battery on a wireless tablet is plugged
in. Although current wireless tablets do not explicitly report this
information, it can be inferred from other state information. In
particular, a battery is assumed to be present if any of the following
are true: a non-zero battery level reported, the battery is reported as
charging, or the tablet is operating wirelessly.

Note: The last condition above may not strictly hold for the Graphire
Wireless (it charges from a DC barrel jack instead of a USB port), but I
do not know what is reported in the no-battery condition.

Signed-off-by: Jason Gerecke <killertofu@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>