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

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Date:	Sat, 10 Mar 2007 14:02:19 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Mariusz Kozlowski <m.kozlowski@...land.pl>
cc:	Jiri Kosina <jkosina@...e.cz>, Greg KH <greg@...ah.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-usb-devel@...ts.sourceforge.net>
Subject: Re: [linux-usb-devel] 2.6.21-rc3-mm1

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

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