On Mon, 12 April 2010 Jiri Kosina <jkosina@xxxxxxx> wrote: > On Sun, 11 Apr 2010, Bruno Prémont wrote: > > > > > As far as I understand the code, in auto-suspend case if the driver > > > > sends commands to the device it will have to call usbhid_wait_io(). > > > > Please correct me if I'm wrong! > > > > > > It's not needed. There is a queuing mechanism in place on > > > 'resumption_waker' workqueue. > > > > So the driver is not allowed to ask the device to do something > > at auto-suspend time (as that would abort the auto-suspension). > > What do you mean by "is not allowed" exactly? > > Yes, it will wake the device up from auto-suspension. However, that's > usually what you want to happen, is there is anything you need to dispatch > to the device, isn't it? I thought of a report to send to device to ask the device to disable some power using feature (e.g. turning off or dimming LEDs) > What exactly is the situation you are trying to handle? That's rather a generic question, not related to any implementation. Maybe I'm mixing suspend and USB-autosuspend too much? Thanks, Bruno -- 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
