Re: [RFC PATCH] usb/acpi: Add support usb port power off mechanism for device fixed on the motherboard

[Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>]

On Tue, May 15, 2012 at 08:18:00AM -0700, Greg KH wrote:
> On Tue, May 15, 2012 at 10:31:38PM +0800, Lan Tianyu wrote:
> > Since alan suggested we should start simpler version(power
> > down port that have no devices attached) firstly. And we
> > also should provide general power off mechanism.
> > 
> > I have a proposal.
> > first:  add portx_power_control sys file.
> >      echo "auto" => portx_power_control
> >                     check whether there is a device. if no, send the clear
> >                     USB_PORT_FEAT_POWER request. (since general way
> >                     to control port power is via set or clear PORT_POWER)
> > 
> >     echo "on" =>  portx_power_control
> >                     send the set  USB_PORT_FEAT_POWER request.
> 
> No "off"?

Yeah, we probably need an "off" for those libusb and ModemManager
developers who want to try and simulate a disconnect of a misbehaving
device.

Sarah Sharp
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