IOCTL is a function call that allows you to interface with
kernel drivers, and adjust settings or set parameters from
code without compiling a new module. Timer1 is started
according to the control and configuration commands passed
by the ioctl. And in the timer interrupt service routine, the
Wireless module data I/O outputs specific width of high or
low level in turn. It finally realizes to send address and data
codes to the remote wireless switch.