Re: [RFC PATCH V3 3/3] usb : Add sysfs files to control usb port's power

[Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>]

On Tue, 5 Jun 2012, Lan Tianyu wrote:

> > The patch does not implement anything at all for "auto".  It should do
> > _something_.
> >
> Yeah, if we don't power off port without device when echo "auto" > portX/control,
> this patch does nothing about "auto". Original plan is to deal with port without
> devices firstly. Do you mean I should add the process of port with device in this
> patch?

At least make a start.  For example, have "auto" turn off the power if
no device is attached to the port.

If "auto" does nothing, there's no reason to put it in this patch at 
all.  It could be added in a later patch, along with its 
implementation.

Alan Stern

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