Re: [linux-usb-devel] 2.6.21-rc3-mm1

Alan Stern
2007-03-10T19:55:45Z

On Sat, 10 Mar 2007, Mariusz Kozlowski wrote:

> Hello,
>
> > > Right. Can't be 100% sure but without the patch it would have probably
> > > failed by now so I guess the patch is ok. Not sure how to make usb mouse
> > > plugging/unplugging process automatic ;-)
> >
> > echo FOO >/sys/bus/usb/drivers/usbhid/unbind
> >
> > to simulate an unplug (actually, to do an unbind), and
> >
> > echo FOO >/sys/bus/usb/drivers/usbhid/unbind
> ^^^^^^ bind I guess

Whoops, yes. Cut & paste strikes again...

> > to do a bind, where FOO is the name of the USB mouse device link present
> > in the /sys/bus/usb/drivers/usbhid directory.
>
> # ls -al /sys/bus/usb/drivers/usbhid
> total 0
> drwxr-xr-x 2 root root 0 Mar 10 17:30 .
> drwxr-xr-x 8 root root 0 Mar 10 17:14 ..
> lrwxrwxrwx 1 root root 0 Mar 10 17:30 2-2:1.0 -> ../../../../devices/pci0000:00/0000:00:0c.0/usb2/2-2/2-2:1.0
> --w------- 1 root root 4096 Mar 10 17:17 bind
> lrwxrwxrwx 1 root root 0 Mar 10 17:17 module -> ../../../../module/usbhid
> --w------- 1 root root 4096 Mar 10 17:17 new_id
> --w------- 1 root root 0 Mar 10 17:22 unbind
>
> # echo "2-2:1.0" > /sys/bus/usb/drivers/usbhid/unbind
> bash: echo: write error: No such device
>
> Any thoughts?

Another mistake on my part. The correct command is

echo -n '2-2:1.0' >/sys/bus/usb/drivers/usbhid/unbind

Without the "-n", the system thinks that the newline character at the end
of the line written by "echo" is part of the filename.

Alan Stern