MPU401_MODE_BIT_INPUT
#define MPU401_MODE_INPUT (1<<MPU401_MODE_BIT_INPUT)
set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))