Re: USB drivers

From: Chris (chris_at_tellme3times.com)
Date: 08/08/04

  • Next message: M. Warner Losh: "Re: USB drivers" 
    Date: Sun, 08 Aug 2004 00:08:22 -0400
To: Darren Pilgrim <dmp@bitfreak.org>

    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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  • Next message: M. Warner Losh: "Re: USB drivers"

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