REG_C2HEVT_CLEAR
rtl_write_byte(rtlpriv, REG_C2HEVT_CLEAR, 0);
rtw_write8(adapter, REG_C2HEVT_CLEAR, C2H_EVT_HOST_CLOSE);
trigger = rtw_read8(adapter, REG_C2HEVT_CLEAR);
rtw_write8(adapter, REG_C2HEVT_CLEAR, C2H_EVT_HOST_CLOSE);