Date: Sun, 08 Aug 2004 00:08:22 -0400 From: Chris <chris@tellme3times.com> To: Darren Pilgrim <dmp@bitfreak.org> Cc: "'M. Warner Losh'" <imp@bsdimp.com> Subject: Re: USB drivers Message-ID: <4115A736.9000705@tellme3times.com> In-Reply-To: <000001c47cb8$8ef1bb50$142a15ac@spud> References: <000001c47cb8$8ef1bb50$142a15ac@spud>
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Darren Pilgrim wrote: >>From: M. Warner Losh >> >>In message: <41124C8B.2060902@tellme3times.com> >> Chris <chris@tellme3times.com> writes: >>: >>: What I am trying to determine is why my multifunction >> >> >printer/scanner > > >>: receives only one of the two drivers. Is it because the printer >> >> >does > > >>: not respond properly? Is it because the printer is not defined? I >>: have many questions here. >> >>Yes. Usb is a little complicated in this area, and there are a number >>of details that are hard to get right. It wouldn't surprise me if the >>current set of drivers are less than completely optimal. >> >> > >On a bit of a side-track, I'm wondering if it could be due to how the >multifunction device presents itself? A bit back in this thread someone >mentioned that a pointer must be present for a driver to attach to a >device. If there is only one pointer for a device, only one driver may >attach. Since a single USB bus can have a LOT of devices and each >device's capabilities are determined through the presence of usage >pages, I see two ways for a multifunction device to present itself: > >- A single device ID with more than one usage page. All the >functionality is there and is compatible with FreeBSD drivers, but since >there is only one device probed on the bus, only one driver may attach. >Perhaps a "simple" mux driver would be useful? > >- A multiple single-usage device IDs. Same functionality as before, but >now FreeBSD can probe unique printer and scanner devices and thus let >both ulpt and uscanner attach simutaneously. > >Am I way off base? > > > > What I would like to know is where are these tests done. Or should I say where does USB start to load and what are the steps in between. Chris
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