access driver private instance variables
Return the driver-specific state of dev
softc is automatically allocated and zeroed when the device is attached. The
softc is also initialized and present when a device is probed, but is subject
to caveats as described in DEVICE_PROBE(9)
size of the allocation is determined by the device's
information used to define the
driver. The softc typically encapsulates the state of this instance of the
Driver writers are discouraged from using their own softc management mechanisms.
Driver writers should not copy such mechanisms found in drivers in the tree
that predate this function.
The pointer to the driver-specific instance variable is returned.
This manual page was written by Doug