Hi) For porting guide check this blogpost http://ragustechblog.blogspot.in/2015/06/porting-driver-from-freebsd-to-rtems.html Also read libbsd's README, especially "Rules for Modifying FreeBSD Source"
Can't say anything specific about USB HID and WLAN. Definitely WLAN will require porting libraries with auth protocols (WPA\WEP). About HID, you can try searching how input works in RTEMS. Maybe you can implement API in your future HID driver
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