_M220             770 drivers/input/misc/yealink.c static DEVICE_ATTR(show_icon	, _M220, NULL		, show_icon	);
_M220             771 drivers/input/misc/yealink.c static DEVICE_ATTR(hide_icon	, _M220, NULL		, hide_icon	);
_M220             772 drivers/input/misc/yealink.c static DEVICE_ATTR(ringtone	, _M220, NULL		, store_ringtone);