Re: detecting when keys are being pressed on a keyboard

Am Freitag 21 September 2007 schrieb Jiri Kosina:

On Fri, 21 Sep 2007, Oliver Neukum wrote:

quoted

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.
Secondly, what is to happen in case of a system wide suspend? Will
the system wake up thinking that the key is still pressed?

	Regards
		Oliver

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