usb: disable

[Net Llama!]

On 12/30/02 16:55, Joel Hammer wrote:
> I am still fussing with digital photos.
> 
> I would like to have my digital camera, with a usb connection, tethered to a
> computer (linux). I would like to shoot a series of photos with the camera,
> then, with a simple command on the computer, transfer those photos to the
> computer.
> 
> The problem is that when you plug in the usb cable into the camera, the
> camera goes out of the picture taking mode, so it is useless for photos.
> 
> However, if I plug in the usb cable without the cable being connected to
> the computer, the camera stays in the picture taking mode. Voila. This
> suggests there may be a solution.
> 
> So, the obvious questions are:
> 
> 1. Is there such a beast as a usb switch box which would accomplish this
> with a minimum of fuss?
> 
> 2. Is there a way to disable the usb socket via software, like removing
> modules or sending a 0 into a file in /proc ?
> 
> I have tried taking out all the usb modules, but that didn't work.
> 
> Here are the modules I load to get the usb port to work with my camera:
> 
> 
> Module                  Size  Used by
> usb-storage            23284   0  (unused)
> nls_iso8859-1           2636   0
> ide-scsi                7428   0
> sr_mod                 11800   0
> sg                     21692   0
> sd_mod                  9832   0
> scsi_mod               53024   4  [usb-storage ide-scsi sr_mod sg sd_mod]
> hid                    12016   0  (unused)
> usb-uhci               21720   0  (unused)
> usbcore                27940   0  [usb-storage hid usb-uhci] 
> 
> With all these modules gone, plugging in the cable still turns off the
> camera.
> 
> Is there a USB driver that could be compiled as a module which I have
> built into the kernel ?

If you could manage to unload usbcore, then you'd get the desired 
result.  However, i've never had any luck unloading usbcore once its 
loaded (under a 2.4.x kernel, perhaps the rules are different for 2.5.x).

> 
> Now, according to the salesmen, I could use a firewire connection to do what
> I want, but, amazingly, those cameras cost several thousand dollars more
> than the usb camera (Nikons).

Yea, IEEE1394 hardware is still quite pricy.  Its not being marketed as 
well as USB, and AFAIK, only Macs, and some laptops come standard with a 
firewire port.

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
L. Friedman                       	       netllama at linux-sxs.org
Linux Step-by-step & TyGeMo: 		    http://netllama.ipfox.com

   5:00pm  up 16 days, 9 min,  2 users,  load average: 0.03, 0.08, 0.14