Re: usb vs. drivers
From: Christian Convey (conveycj_at_npt.nuwc.navy.mil)
Date: 11/30/04
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Date: Tue, 30 Nov 2004 09:23:39 -0500 To: debian-user <debian-user@lists.debian.org>
Hi Andrea,
I am using hotplug and udev. Thanks for the Gnome tips; I'd still like
to solve this at a lower level if possible.
Do you know the process by which the system goes from (a) discovering
that a device was connected to a USB port, to (z) binding a driver to
that device?
The reason I'm asking is that I'm trying to make my camera work on
Sarge. I *suspect* that no driver is getting loaded for it. I figure
that understanding the process by which drivers get bound to hotplugged
devices will let me better debug the problem.
Thanks for your help,
Christian
Andrea Vettorello wrote:
> 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
>
>
-- Christian Convey Computer Scientist, Naval Undersea Warfare Center Newport, RI -- To UNSUBSCRIBE, email to debian-user-REQUEST@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org
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