Hi,
I need to update some software that programatically determines what devices
are present on a Linux system, to now support USB devices. I've travelled
or started down three paths so far...
The current design/implementation identifies devices via /sys/devices, then
matches up based on the info found there, the appropriate file in /dev for
SCSI and IDE devices to communicate with them. I have had little success
determining how USB devices are represented in /sys or /dev. eg. naming
conventions, info available, operations available, etc.
- Should I be able to continue to use the existing design/implementation
based on /sys & /dev with minimal changes?
- Where might I find a good description of the representation of USB devices
in /sys and /dev?
- Is there USB information present in /sys and /dev that will enable me to
know I'm looking at the same device in both places?
We did find and glance at the documentation and implementation of the
'lsusb' command, but it appears to be based on /proc. Should I make use of
/proc? My (beginner) understanding was that this was the type of
information that is being migrated from /proc to /sys. I'm not sure if
that's linked to newer kernels or not...
I have now found, but have not had a chance to read in detail, the Linux USB
Guide, that seems to indicate there is a specific Linux-USB subsystem.
- Is use of it the best way to discover and communicate with USB devices?
In other words, do I have to change the design/implementation of this
software to make use of it?
- If I use it in conjunction with the original design/implementation, is
there potential overlap in what will be "discovered" in /sys/devices and
what the Linux-USB subsystem provides?
- Likewise, if I use it, should/must it be used instead of a /dev file to
communicate with the device? Can I determine which /dev file represents
what appears in the Linux-USB subsystem?
Any information and/or pointers to information will be appreciated a great
deal.
Thank you,
BobCap.
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