I2C_GET_OUTPUT
ret = ioctl_retry(fp, I2C_GET_OUTPUT, (void *)value);
ret = ioctl_retry(fp, I2C_GET_OUTPUT, (void *)value);
ret = ioctl_retry(fp, I2C_GET_OUTPUT, (void *)&value);
case I2C_GET_OUTPUT:
case I2C_GET_OUTPUT: