On Nov 25 2008, at 15:18, Alan Stern was caught saying: > On Tue, 25 Nov 2008, Deepak Saxena wrote: > > > The sideband signal is a gpio. The driver knows that the GPIO exists, > > but it does not know that it anything about it is routed on the board > > IMHO it should not. > > It's a difficult problem. You've essentially got a platform device on > the USB bus. > > > > The easiest answer is for the driver to call directly into the platform code. > > > > Agreed, and there are several ways to do this: > > > > One is to do wrap code around #ifdef and if(machine_is_olpc()) to make > > a call to an OLPC-specific call. > > > > The other is to add a generic platform wakeup hook mechanism such as > > either my original proposal or adding a set_wakeup() to struct device > > itself. Another option is to have a single platform_set_wakeup() > > pointer similar to the platform_notify() and platform_notify_remove(). > > I'm not sure... This sort of thing isn't something I've had to deal > with before. I'm going to throw a patch togethre and post it here and on lkml for vetting and we can go from there. > Suppose the same sort of WLAN interface was packaged as an independent, > external USB device and one of them was plugged into an OLPC. Then how > would you know which device was the one attached to the embedded > controller and which was external? I think in that case we couldn't really do WOL. I imagine this is the case on a standard laptop too. On future XO versions, we may move to an SDIO based card and we will have to deal with the same situation where the SDIO stack has a concept of wake up on card insert/remove but we will need to route the WOL signal from the card to the EC. ~Deepak -- Deepak Saxena http://www.greenbasement.info _____ __o Kernel Hacker, One Laptop Per Child (o> ------ -\<, Give One Laptop, Get One Laptop //\ ----- ( )/ ( ) http://www.amazon.com/xo V_/_ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
