On Thu, 5 Oct 2006, Oliver Neukum wrote: > > > > If you are talking runtime suspend, you should probably just wake the > > > > device up on first access. > > > > > > Do you really think a device driver should override an explicitely > > > selected power state? > > > > (So we are talking runtime suspend?) > > Yes. Otherwise the patch would have been ready two days ago. > But if I am implenting this, I'll do a full implementation. > > > No, I do not know what the right interface is. I started to suspect > > that drivers should suspend/resume devices automatically, without > > userland help. Maybe having autosuspend_timeout in sysfs is enough. > > If you do this at kernel level, you'll screw up any demon implementing > a power policy to stay within the budget.
Currently we don't have any userspace APIs for such a daemon to use. The only existing API is deprecated and will go away soon. Current thinking is that a driver will suspend its device whenever the device isn't in use. With usblp, that would be whenever the device file isn't open. See the example code in usb-skeleton.c. Alan Stern ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
