On Wed, 16 May 2012, Lan Tianyu wrote: > On 2012/5/16 22:39, Greg KH wrote: > > On Wed, May 16, 2012 at 10:36:02AM -0400, Alan Stern wrote: > >> On Wed, 16 May 2012, Lan Tianyu 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? > When the port was powered off, the connect-change event will not be > detected and > we don't know a device was plugged in. :( Ah, yes. Okay, then I guess we _don't_ want a setting like the one I suggested. The original proposal was good. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
