linux-kernel - Re: Cut power to a USB port?

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Date:	Tue, 2 Jan 2007 08:36:50 -0800
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Andrew Barr <andrew.james.barr@...il.com>
Cc:	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: Re: Cut power to a USB port?

On Tue, 02 Jan 2007 10:28:38 -0500 Andrew Barr wrote:

> On Tue, 2007-01-02 at 00:32 -0800, Greg KH wrote:
> > On Mon, Jan 01, 2007 at 03:56:25PM -0500, Andrew Barr wrote:
> > > I have a simple question perhaps someone can help me with here...
> > > 
> > > I have one of those simple LED keyboard lamps that get their power from
> > > the USB port. Is there some way in Linux, using files under /sys I would
> > > imagine, to cut power to the USB port into which this lamp is plugged? I
> > > know I would have to manually figure out what port it's plugged into, as
> > > it is not a "real" USB device...e.g. it just draws power. I would like
> > > to be able to programmatically switch the lamp on and off.
> > 
> > Search the archives of the linux-usb-devel mailing list for a program
> > that might do this for you (depending on your hardware.)
> 
> What search terms should I use? Searching on "power" and "port power" at
> Gmane in the gmane.linux.usb.devel group doesn't readily give me
> anything.

You can try:

usbpoweroff.c
(http://www.informatik.uni-halle.de/~ladischc/usbpoweroff.c)
or
hub-ctrl-2.c (http://www.gniibe.org/log/linux)

> For the record, my hardware:
> 
> 00:1d.0 USB Controller: Intel Corporation 82801DB/DBL/DBM
> (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 01)
> 00:1d.1 USB Controller: Intel Corporation 82801DB/DBL/DBM
> (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 01)
> 00:1d.2 USB Controller: Intel Corporation 82801DB/DBL/DBM
> (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 01)
> 00:1d.7 USB Controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2
> EHCI Controller (rev 01)
> 
> IBM Thinkpad R51 2883-ELU.


---
~Randy
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