MPU401_MODE_BIT_OUTPUT_TRIGGER
#define MPU401_MODE_OUTPUT_TRIGGER (1<<MPU401_MODE_BIT_OUTPUT_TRIGGER)
set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {