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

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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"?

> second:
> In the  xhci driver, add acpi hook in the xhci_hub_control()
>                 where USB_PORT_FEAT_POWER request is dealt with.

Do you have a patch showing that this works?

greg k-h
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