MPU401_INFO_INPUT
if (! (info_flags & (MPU401_INFO_INPUT | MPU401_INFO_OUTPUT)))
info_flags |= MPU401_INFO_INPUT | MPU401_INFO_OUTPUT;
in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0;
if (mpu->info_flags & MPU401_INFO_INPUT) {
info_flags |= MPU401_INFO_INPUT;