1 What: /config/usb-gadget/gadget/functions/SourceSink.name
7 pattern - 0 (all zeros), 1 (mod63), 2 (none)
9 isoc_maxpacket - 0 - 1023 (fs), 0 - 1024 (hs/ss)
10 isoc_mult - 0..2 (hs/ss only)
11 isoc_maxburst - 0..15 (ss only)
12 buflen - buffer length