Hi Oliver, On 9/24/07, Oliver Neukum <[EMAIL PROTECTED]> wrote: > Am Freitag 21 September 2007 schrieb Jiri Kosina: > > On Fri, 21 Sep 2007, Oliver Neukum wrote: > > > > > I got the strange case of a keyboard going into autosuspend while a key > > > was being pressed. The key release never arrived and I had to unplug the > > > keyboard to get the key unstuck. Is there a clean way to learn from > > > hid-core.c if a keyboard has keys pressed? > > > > Hi Oliver, > > > > HID doesn't keep any permanent state by itself. If you want to know > > whether a given key is currently pressed or not, you'd have to inspect the > > bitfields inside input_dev*, I am afraid. > > I see no way to do this without a race condition. The field isn't locked > as far as I can tell.
You can take input_dev->event_lock to stop event from propagating through input core while you are evaluating the bits. Input lcoking changes are im -mm and will be merged into 2.6.24. > Secondly, what is to happen in case of a system wide suspend? Will > the system wake up thinking that the key is still pressed? > For now it will but it is about to change. Input device will send 'release' events for all pressed keys from their suspend method. -- Dmitry
