Hi! > > I think the simple and working solution would be never suspedning devices > > that have interface open through hidraw, unless user explicitly allows > > this through respective power/autosuspend setting in sysfs (which will by > > default be set to 'off' for HID devices anyway, right?). > > That we already have. That's the simple copout. Do not enable autosuspend > if you allow hidraw for a device. However, if normal users shall be able to use > the hidraw device that means that autosuspend can never be enabled for the > device, as we don't know when someone will use the device. > > For hiddev we can do better, the device is not autosuspended while it is > open. This allows allowing ordinary users to use the device. Doing so for > hidraw would require to extended the low level hid API. But not as extensively > as I suggested. > > But I consider this to be a lost opportunity. > Currently the ll driver must assume that the device is required to be fully > operational when it is open. This means different things for ordinary input > devices and "raw" devices. Raw devices must not be autosuspended when > open at all. Ordinary devices must be able to process input. > > But that is often overkill. In many situations, for example when a the screen > saver is running, you only care that a key has been pressed, not which key. > Drivers can save more power if they know this. ...way more power in some cases. Yes, I'd love to see interface like that. -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
