int wl3501_ioctl (struct net_device * dev, struct ifreq * rq, int cmd);
dev - network device ifreq - request cmd - command
Perform IOCTL call functions here. Some are privileged operations and the effective uid is checked in those cases.
This part is optional. Needed only if you want to run wlu (unix version).
To prevent interrupted by wl3501_interrupt and timer-based wl3501_hard_start_xmit from other interrupts, this should be run single-threaded.