Revert "Remove support for xpp drivers."
-rw-r--r-- 1410 .gitignore
-rw-r--r-- 18008 LICENSE
-rw-r--r-- 26423 LICENSE.LGPL
-rw-r--r-- 5872 Makefile
-rw-r--r-- 52421 README
-rw-r--r-- 3804 UPGRADE.txt
drwxr-xr-x - build_tools
-rwxr-xr-x 1679 dahdi-modules
drwxr-xr-x - drivers
drwxr-xr-x - include