Very Computer

1. Need help porting DOS app that uses parallel port (Part II)

Randy Olinger spewed forth:

This is a computer interface board I bought from velleman
(www.velleman.be) and soldered together myself.  The card basicly hooks to
your parallel port and allows your PC to interact with any external
electronic device.  I has 16 digital outputs that can be turned on and
off, 16 digital inputs whose on/off status can be read, and a couple
analogue inputs and outputs as well.  I'm pretty darn sure there is no
linux driver for it.

What THEY provide with the board is a single C "function library"?
containing c functions for initializing and reading and writing to the
card.  This c file is meant to be compiled under DOS and uses functions
that read and write directly to the IO buffers of the port (inport and
outport).  They also provide several example programs which put together
the read and write function from the "function library" to make the card do
something interesting like turn a heater on if the temp drops.

So it sounds to me like the best thing for me to do is grab a copy of
"Linux Device Drivers" and "port" the "function library" into a device
driver.  The hard part is done really.  The C code detailing the
communications protocol with the card is provided.  I just have to add the
code to make it a kernel module, and to have it talk through the
appropriate kernel interfaces to the parallel port and not directly
to the hardware.  How close am I here?  Anyone have any suggestions as to
which kernel modules I should use as an example?  What kernel code I
should look at to start with?

        Thanks for any and all help,
        Chris

--
"(America is) a country where a dual morality, hypocrisy and nonsense have
been allowed to dominate politics and the mass media for years, and this
doesn't make it look so reliable as a world policeman..."
        -The Swedish Newspaper Aftonbladet

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