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