currently the RT-Socket-CAN drivers maintains it's own version or
release number. As RT-Socket-CAN is part of Xenomai, I do not see the
need for it (and so far I did not update it). What is the intended use
of "driver_version" in "struct rtdm_device"? Furthermore, there is also
"profile_version" (which does not show up n the Doxygen docu for some
strange reason). The latter one seems suitable to reflect CAN API changes.
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