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HID: wacom: remove the battery when the EKR is off
commit 9ac6678 upstream. Currently the EKR battery remains even after we stop getting information from the device. This can lead to a stale battery persisting indefinitely in userspace. The remote sends a heartbeat every 10 seconds. Delete the battery if we miss two heartbeats (after 21 seconds). Restore the battery once we see a heartbeat again. Signed-off-by: Aaron Skomra <skomra@gmail.com> Signed-off-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com> Reviewed-by: Jason Gerecke <jason.gerecke@wacom.com> Fixes: 9f1015d ("HID: wacom: EKR: attach the power_supply on first connection") CC: stable@vger.kernel.org Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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