parport_claim — claim access to a parallel port device
int parport_claim ( | struct pardevice * | dev); |
This function will not block and so can be used from interrupt
context. If parport_claim succeeds in claiming access to
the port it returns zero and the port is available to use. It
may fail (returning non-zero) if the port is in use by another
driver and that driver is not willing to relinquish control of
the port.