On Friday, 6. February 2009, Arve Hjønnevåg wrote: > On Thu, Feb 5, 2009 at 1:11 AM, Pavel Machek <pavel@xxxxxx> wrote: > > On Wed 2009-02-04 18:50:14, Arve Hj??nnev??g wrote: > >> +A locked wakelock, depending on its type, prevents the system from > >> entering +suspend or other low-power states. When creating a wakelock, > >> you can select +if it prevents suspend or low-power idle states. If the > >> type is set to > > > > idle states are very different from suspend. Mixing them does not look > > like good idea... and IIRC we already have API somewhere to prevent > > deep idle states. Intel did it for their wireless cards IIRC. > > If you are talking about the pm_qos interface, then yes there is some > overlap. We did not use the pm_qos interface since it does a linear > scan for a string every time you change a requirement, and it only let > you specify the latency you need not the power level. We have > interrupts that stop working at the lowest power level and this does > not easily translate into a latency value. > > >> + Key pressed Key released > >> + | | > >> +keypad-scan ++++++++++++++++++ > >> +input-event-queue +++ +++ > >> +process-input-events +++ +++ > >> + > > > > I'm not sure if keyboard scanning example is good here. It is very > > t-mobile G1 specific. > > There is no G1 specific code in the keypad driver. I also don't > remember seeing any development boards without a similar keypad. I > like this example since it show how an event can be passed from the > kernel to user-space. > I absolutely agree. The example shows how you can keep wake locks right from the time the interrupt comes in through all levels until a user space action gets triggered. Uli -- ------- ROAD ...the handyPC Company - - - ) ) ) Uli Luckas Head of Software Development ROAD GmbH Bennigsenstr. 14 | 12159 Berlin | Germany fon: +49 (30) 230069 - 62 | fax: +49 (30) 230069 - 69 url: www.road.de Amtsgericht Charlottenburg: HRB 96688 B Managing director: Hans-Peter Constien _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
