180         State previousState;  in enroll()  local
184             previousState = mState;  in enroll()
185             if (previousState == State::IDLE) {  in enroll()
199                   int(ErrorCode::E_INCORRECT_STATE), state2str(previousState).c_str());  in enroll()
214     State previousState;  in authenticate()  local
218         previousState = mState;  in authenticate()
219         if (previousState == State::IDLE) {  in authenticate()
234                     state2str(previousState).c_str());  in authenticate()
244     State previousState;  in detectInteraction()  local
248         previousState = mState;  in detectInteraction()
249         if (previousState == State::IDLE) {  in detectInteraction()
263                     state2str(previousState).c_str());  in detectInteraction()