From: "Nigel Roles" <nigel@9fs.org>
To: <9fans@cse.psu.edu>
Subject: RE: [9fans] USB weirdness.
Date: Wed, 15 Jan 2003 21:33:45 +0000 [thread overview]
Message-ID: <HOEHIDJJJINMLFPOLFJCKEKACJAA.nigel@9fs.org> (raw)
In-Reply-To: <200301152111.h0FLBCw21088@augusta.math.psu.edu>
No, that's quite likely. If the device class of the device descriptor
is set to 0, so will be the subclass, and most likely the protocol. It
indicates that the real information is within the configuration.
As it says in Table 9-7 of USB 1,1:
If this field is reset to zero, each interface
within a configuration specifies its own
class information and the various
interfaces operate independently.
Configurations represent different operating modes of a device; this
is often used to have a device which has behaviour according to the
standard, and a proprietary mode as well. Quite a lot of proprietary
devices pass the buck to the configuration descriptor.
Unfortunately, the Plan 9 arrangements don't express alternate
configurations.
-----Original Message-----
From: 9fans-admin@cse.psu.edu [mailto:9fans-admin@cse.psu.edu]On Behalf
Of Dan Cross
Sent: 15 January 2003 21:11
To: 9fans@cse.psu.edu
Subject: [9fans] USB weirdness.
When scanning USB status files, I see a lot of ``Enabled 0x000000''.
Surely the vendor/class/device strings really *aren't* all zero's;
has anyone else seen this?
- Dan C.
next prev parent reply other threads:[~2003-01-15 21:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-15 21:11 Dan Cross
2003-01-15 21:33 ` Nigel Roles [this message]
2003-01-15 22:00 ` Dan Cross
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