MPU401_MODE_BIT_OUTPUT
#define MPU401_MODE_OUTPUT (1<<MPU401_MODE_BIT_OUTPUT)
if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) {
set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode))
clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&