On Mon, Apr 15, 2002 at 07:05:34PM -0500, William A. Gatliff wrote:
> Greg:
>
> On Mon, Apr 15, 2002 at 03:47:42PM -0700, Greg KH wrote:
> > Um, you're missing a out endpoint, which is necessary for the generic
> > usb-serial driver to write data to. This is why writes will not work :)
>
> Right. D'oh!
>
> Know what's wierd? The previous cut-and-paste from usbview *did* have
> an OUT endpoint. After tinkering a bit, I've discovered that
> sometimes it's there, sometimes it isn't. Hmmm, that's more to look
> into than I had a few minutes ago... thanks! :^)
>
> > Do you have a pointer to the arm-linux code on the device that
> > implements the usb device side interface?
>
> Not yet, I haven't written it. The general idea is to continue using
> usbserial, a'la the Visor driver.
You want to use usbserial on the device side? You might want to look
into the usbd code that Lineo just released for USB client devices.
I have started to merge this into the main kernel 2.5 tree. It can be
seen at:
http://linuxusb.bkbits.net:8080/usbd-2.5
if you're interested in looking at it, or using it.
There is a usb network and usb serial device driver in that tree, which
sounds like you are looking for. The network driver works with Windows
hosts.
> I intend to use /dev/ttyUSB0 on the PC side, and mknod c 240 10
> (SA1110 usb-char) on the arm-linux side. At the application level, it
> will (hopefully, critiques welcome) just look like a fast serial port,
> which I *think* is how usbserial is intended to work. That's how it
> looks like it's working in visor.c, anyway.
>
> Once I have that going, I'll figure out how to talk to the arm-linux
> client from the Win32 world--- which I'm hoping won't require any more
> work on the arm-linux side. Not sure exactly how that's going to pan
> out, I still have some research to do...
>
> At any rate, if possible I'd like to test with minicom running at both
> ends for now, until I'm sure that the low-level stuff is right.
>
> Does this seem rational?
Yes it does.
Good luck,
greg k-h
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