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

Sergei Shtylyov
2012-05-17T11:42:52Z

Hello.

On 16-05-2012 18:39, Greg KH wrote:

>>> Ok. Let me reconfirm the meaning of these opinions.

>>> "auto"
>>> if port without device, turn off power directly.
>>> if port with device, turn off power when the device is suspended.

>>> "on" the port's power must be on.

>>> "off" the port's power must be off.

>>> Right?

>> Maybe the "auto" setting should be renamed "active". Then "auto" can
>> be used for:

>> If the port has a device, turn the power on.
>> If the port doesn't have a device, turn the power off.

> And plugging a new device into a port that was powered off is going to
> cause the power to come back on, right?

How plugging a device can be detected on unpowered port?

WBR, Sergei
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