Re: Driver for Microsoft USB Fingerprint Reader

[Greg KH <greg@kroah.com>]

A: No.
Q: Should I include quotations after my reply?

On Mon, Jul 03, 2006 at 04:53:43PM -0400, Daniel Bonekeeper wrote:
> hahahaha I wish I could... well, you are _always_ welcome to donate me
> yours ! =P
> I'll try more later to get one of those readers...
> 
> Reading Greg's comment, now I'm in doubt if this should really be in
> kernel mode or at userspace. Since there is no standard (AFAIK) for
> those readers, how should it be done ?

It all depends on what you want the userspace interface to be.

> Another thing: where can I find documentation about the USB
> architecture ?

www.usb.org for the USB specs.  See the kernel built-in documentation
for a full document on how the Linux USB layer works.

> For example, I suppose that some (or all) USB devices may have DMA
> capabilities... how is this done ?

Heh, no, USB can't do DMA at all.  Why would you think they could?  It's
a serial bus that just streams data across it at relativly slow speeds.

thanks,

greg k-h