HID: wacom: Add battery presence indicator to wireless tablets

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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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Jason Gerecke 2015-03-11 10:25:41 -07:00 • committed by Jiri Kosina

parent 8fac172214

commit 71fa641ebb

3 changed files with 15 additions and 6 deletions

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4

drivers/hid/wacom_sys.c

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16

drivers/hid/wacom_wac.c

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1

drivers/hid/wacom_wac.h

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