Am Samstag, 12. Juli 2003 11:36 schrieb Siddhartha Jain:
> hello,
>
> Ok .. this is a repost. I got a USB modem with no
> driver for linux (searched far and wide). Now I want
> to write a driver for it. I got SnoopyPro on my Win2k
Good.
> machine and read a couple of brief tutorials on
> writing USB drivers. But still can't figure out where
> to start for writing a modem driver.
First the protocol. Writing a driver is usually easy compared to
that.
> What part of the communication is propreitary here
> that I need to decipher from sniffing the
> communication between the Win2k box and the modem?
Any weird protocol is possible.
First you should take a look at the descriptor via 'lsusb'.
Second you need to determine whether the device needs
its firmware to be downloaded from the host. To determine
that you should snoop a device detecion.
If you observe a firmware download here, the sequence must simply
be recreated. That is easy but possibly tedious.
Then you should try to access the modem via a terminal program.
This should allow you to determine how the modem deals with control
sequences like 'ATZ' or 'ATDT'.
By now you should have a working hypotheses on the protocol
and the function of the endpoints.
HTH
Oliver
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