[Linux-parport] usblp ioctl's

ST st at iss.tu-darmstadt.de
Thu Jun 21 19:52:57 EDT 2007


Does anybody has a pointer to some documentation of the usblp ioctls. I would 
like to switch an usb-to-lp adapter cable to spp mode. The kernel source 
doesn't help me, since i don't know how to infer the ioctl nr and i am 
missing a decription of the functionality of these ioctls in the kernel 

Also if someone has a suggestion what magic input pins (ack, busy etc. ) need 
to be set that a "echo 'this is some long text' >/dev/usb/lp1" writes to the 

I am trying to fill a register attached to the parallel port with values.


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