This topic describes the USB Client Driver code that Symbian platform provides.
USB client driver LDD:
is implemented in USBC.LDD
has its source code located in ...\e32\drivers\usbc\d_usbc.cpp
has its project file located in ...\e32\drivers\usbc\usbc.mmp.
USB client controller PDD:
The interface DUsbClientController is defined in ...\e32\include\drivers\usbc.h.