MPU401_MODE_BIT_INPUT_TRIGGER
#define MPU401_MODE_INPUT_TRIGGER (1<<MPU401_MODE_BIT_INPUT_TRIGGER)
if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER,
clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))