0-5v to 5 to 0 v analog level conveter
Or what you really want to do is subtract your 0-5V control signal from a 5V reference....







simulate this circuit &ndash; Schematic created using CircuitLab



NOTE Your op-amp either needs to be powered by >> +- 5V preferred, or a single supply rail-to rail model >5V. if you don't mind a little roll off at the ends.