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Date: Thu, 5 Oct 2006 17:45:25 -0400 (EDT) From: Alan Stern <stern@...land.harvard.edu> To: Oliver Neukum <oliver@...kum.org> cc: Pavel Machek <pavel@....cz>, <linux-kernel@...r.kernel.org>, <linux-usb-devel@...ts.sourceforge.net> Subject: Re: [linux-usb-devel] error to be returned while suspended On Thu, 5 Oct 2006, Oliver Neukum wrote: > I have a few observations, but no solution either: > - if root tells a device to suspend, it shall do so Probably everyone will agree on that. > - the issues of manual & automatic suspend and remote wakeup are orthogonal Except for the fact that remote wakeup kicks in only when a device is suspended. > - there should be a common API for all devices It would be nice, wouldn't it? But we _already_ have several vastly different power-management APIs. Consider for example DPMI and IDE spindown. > - there's no direct connection between power save and open() Why shouldn't a device always be put into a power-saving mode whenever it isn't open? Agreed, you might want to reduce its power usage at times even when it is open... > The question when a device is in use is far from trivial. Yes. It has to be decided by each individual driver. For simple character-oriented devices, "open" is a good first start. Alan Stern - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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