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Byte 31 of the Sixaxis report can change depending on whether or not the
controller is rumbling.  Using bit 3 is the only reliable way to detect the
state of the cable regardless of rumble activity.
Signed-off-by: Frank Praznik <frank.praznik@oh.rr.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>