mp_doccer is a tool that travels C code files, and extracts specially marked information to build documentation. This documentation can be generated in HTML, man pages, or an executable shell script. The markup is very similar to that in the Linux 2.4.x kernel sources.
Download it from here:
http://triptico.com/download/mp_doccer-1.2.1.tar.gz - [GPG signature]
or get the development version using git:
git clone http://git.triptico.com/mp_doccer
You can take a look at mp_doccer's output by browsing the QDGDF API, and get more information from README.