Jeff Brown 6c81a93ef3 Support specifying buffer start offset for USB requests.
Deprecated existing API which only supported passing buffer
and length in favor of a new one that also supports passing
the start.

Being able to pass a start index is very important because
the kernel imposes size limits on how much data can be transferred
at a time so we often need to transmit large buffers in chunks.

Change-Id: I3484b5e68f1ece61d4645ea04be8ee6a3b79169d
2013-03-28 03:13:09 -07:00
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