How to set (and reset) pins of parallel port of a usb-to-p..

Hi All:

I need to interface my computer to a digital circuit and I'm needing
to control (reading, setting and resetting) the pins
of a usb-to-parallel port device that uses usblp kernel module (kernel
2.6.21). After googling around I did not figure out
how to do it.
How can I do that? Is there any ioctl()'s call ? Or some way to get an
address to use outb() and inb() ??

Thanks a lot in advance.

Lucas Brasilino

Hi Jan:

> It's just not possible. USB<->Centronics converters aren't just "port pins"
> as built-in ports. Like USB<->RS232 converters, they do all the handshaking
> on the remote device side alone. The host computer cannot control their
> port pins directly.
>
> Short: If you don't connect a printer to a USB<->Centronics converter, it
> won't work at all.

Thanks for your answer.
Well, it is not possible since USB<->Centronics kernel module (usblp)
does not
implement this kind of 'pin control', right? But it is possible to
write a kernel module
which implements, for example, some proc files that it's content is
written directly
to pins, ie, a file like /proc/lp/strobe that when:

echo 1 > /proc/lp/strobe

the strobe pin is set, isn't it?

regards
Lucas Brasilino