WINE has no knowledge of the *real* hardware connected to your Linux system, e.g. it sees whatever pointing device you have as simple PS/2 mouse. You might have more success using your tablet under VMware or VirtualBox, as those packages simulate an entire PC (including chipset, BIOS, RAM, disks, floppies, and USB ports). Both packages are able to handle USB devices that you dedicate to them (= you allow the virtual OS exclusive control over the USB device you specify). Therefore if your tablet is a USB device you could assign it to the virtual OS and then use the real Windows device drivers to make full use of the tablet.
But running PhotoShop under VMware or VirtualBox is going to be horribly slow.
It would be better if you dropped PhotoShop altogether and used GIMP (or anything else that is native to Linux) instead. Or you don't switch to Linux and go back to Windows.
