Re: usb vs. drivers
From: Andrea Vettorello (andrea.vettorello_at_gmail.com)
Date: 11/30/04
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Date: Tue, 30 Nov 2004 15:11:22 +0100 To: debian-user <debian-user@lists.debian.org>
On Tue, 30 Nov 2004 08:44:57 -0500, Christian Convey
<conveycj@npt.nuwc.navy.mil> wrote:
> Hey guys,
>
> I've got a usb camera (Kodak DX6490). I'm starting to suspect from
> various tinkering I've done (in Knoppix, FC3, and Sarge) that the kernel
> can't find a module to associate with the camera, and that's causing my
> problems.
>
> In 2.6/Sarge...
> - How does the kernel know which driver to use for a USB device I plug in?
>
The kernel alone do nothing, you need "userland" programs to load
kernel modules when a new HD is plugged, like the "hotplug" package.
If you only need to access the photos, usually you only need to load
the "usb-storage" kernel module and maybe the "fat" or "vfat".
If you use Gnome, and you install "udev", "hal",
"gnome-volume-manager" and "hotplug", you usually end with a nice icon
on the desktop automagically whenever you attach a USB mass storage to
your pc, and digital cameras can be seen like USB mass storage.
> - What's the easiest reliable way of knowing whether or not the kernel
> managed to bind a driver to a USB device I plug in?
>
Looking in your /varl/log/syslog or perusing your /proc/bus/usb or
/sys/bus/sys. There are utilities that do this for you and show a nice
tree with device informations.
Andrea
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