On Tue, Jun 24, 2003 at 08:50:23PM +0200, Martin Diehl wrote:
>
> On Tue, 24 Jun 2003, Tomek Grzejszczyk wrote:
>
> > I'am trying to write driver for STIR4200 usb-irda bridge controller. I'am
> > not writing it from scratch but rather modify current irda-usb driver
> > from 2.4.20 kernel. Right now I'am testing what I've written but I've
>
> I'm not sure whether this would be the best approach. From looking across
> the stir4200 datasheet I'm pretty sure it's completely different from
> irda-usb class. So I think all you can keep from irda-usb is some network
> and usb skeleton which might even be a sub-optimal thing to start from for
> this device - but it's your decision of course.
I already pointed to the alpha driver on my web page ;-)
> The second thing I'd suggest is using the very latest 2.4 kernel, probably
> 2.4.22-pre2, in order to get all the recent important irda and usb fixes.
> Or maybe even better 2.5.
I will merge new drivers in 2.5.X first, and reject drivers
that I can't integrate in 2.5.X. I'm starting to get fed up that for
each driver I have to spend a few days just to integrate it properly
in 2.5.X because the author just didn't care.
> Have you seen the experimental driver for the stir4200 at Jeans Homepage?
> Maybe you could start with this one or cooperate with the other author to
> avoid having to start all over?
The main issues with the driver on my web page :
o sequencial transmission of frames is busted, the driver
would need a scheme to properly wait for the end of the transmission
of the previous frame, and the HW doesn't seem to offer an easy way to
do that.
o Rx of frames at 4Mb/s doesn't timely push the frame to the
host and bundle multiple frames in a descriptor without any way to
separate them (you will get multiple RR bundled together).
To be polite, I was not impressed by the hardware design. This
is going to be difficult to workaround those "features".
> Martin
>
> PS: I've added Jean and the irda-users to CC because you send another
> request there and I think the thread would be more appropriate there.
Correct ;-)
Jean
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