From owner-freebsd-usb@FreeBSD.ORG  Wed Jul 20 13:22:07 2011
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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Wed, 20 Jul 2011 15:19:55 +0200
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Subject: Re: Powercycling USB device on hub
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On Wednesday 20 July 2011 14:30:37 Peer Stritzinger wrote:
> Hi,
> 
> is ist possible to power-cycle the HUB port of a USB device by
> programmatic means (via script or libusb or some ioctl)?
> 
> It would be perfect if I could power-off/on just a certain device but
> it would also help to power-cycle all devices on a HUB.
> 

Hi,

Using the usbconfig utility in 8 stable and 9 current, you can set the 
configuration to 255 which means unconfigured and then 0 for the root HUB. For 
non-root HUBs you can BUS-reset the devices usbconfig -d X.Y reset or 
set_config aswell. There is also a power_off command, but your device might 
not come back after that.

--HPS