From: Jason Gerecke <killertofu@gmail.com>
Date: Wed, 11 Mar 2015 17:25:41 +0000 (-0700)
Subject: HID: wacom: Add battery presence indicator to wireless tablets
X-Git-Tag: omap-for-v4.1/fixes-rc1~163^2~1^11~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=71fa641ebbfd2402bdb76d3c6ba7e4a2d1eb2dfc;p=pandora-kernel.git

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>
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