rio_get_device — Begin or continue searching for a RIO device by vid/did
struct rio_dev * rio_get_device (u16 vid, u16 did, struct rio_dev * from);
vid
RIO vid to match or RIO_ANY_ID to match all vids
did
RIO did to match or RIO_ANY_ID to match all dids
from
Previous RIO device found in search, or NULL for new search
Iterates through the list of known RIO devices. If a RIO device is
found with a matching vid and did, the reference count to the
device is incrememted and a pointer to its device structure is returned.
Otherwise, NULL is returned. A new search is initiated by passing NULL
to the from argument. Otherwise, if from is not NULL, searches
continue from next device on the global list. The reference count for
from is always decremented if it is not NULL.