Where could I get a copy of kernel source code?

[magicnat]

I want to compile the driver for rtl8188eu USB wireless. However I cannot load the module after compiling and it seems to be a kernel mismatch problem.

I'm currently using kernel version 3.12.34+, using kernel source files 3.12.34 from raspberry-pi repository.

[notro]

This could be because you use a different gcc than the one used to buil the kernel.

Have you tried rpi-source? It guides you through the process.
https://github.com/notro/rpi-source/wiki

If you use it and succeed, please add and entry for rtl8188eu in https://github.com/notro/rpi-source/wiki/Examples-on-how-to-build-various-modules

[magicnat]

I tried rpi-source and it works fine :)

Thanks for help.