Re: detecting when keys are being pressed on a keyboard
Jiri Kosina <[email protected]>
| Newsgroups | gmane.linux.usb.devel,gmane.linux.kernel.input |
|---|---|
| Message-ID | <[email protected]> |
On Mon, 24 Sep 2007, Oliver Neukum wrote: > > 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. Hi Oliver, Dmitry (CC added) has been doing a lot of rework of locking in input as far as I know. He would know this better. > Secondly, what is to happen in case of a system wide suspend? Will > the system wake up thinking that the key is still pressed? If the release event didn't happen before the machine went to suspend, I'd say so. -- Jiri Kosina ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel