linux-kernel - uinput question

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Date:	Sun, 20 Apr 2008 16:32:36 -0700
From:	Yan Seiner <yan@...ner.com>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: uinput question

I'm trying to set up a system with multiple IR remotes acting as 
keyboards for specific X sessions.

lirc <http://www.lirc.org> is a way to send infrared remote keystrokes 
to applications.  Some time ago I wrote a small patch to kbdd 
<http://handhelds.org/moin/moin.cgi/kbdd> that lets me inject button 
pushes on an IR remote into the /dev/input/uinput system as keyboard 
events.

Now I'd like to send those keyboard events to only one X session, not 
all of them.

In the kbdd code, there is the following snippet when the 
/dev/input/uinput device is opened:

        memset(&dev, 0, sizeof(dev));
        strncpy(dev.name, "SerKBD", UINPUT_MAX_NAME_SIZE);
        dev.idbus = BUS_RS232;
        dev.idvendor = 0x00;
        dev.idproduct = 0x00;
        dev.idversion = 0x00;

So this would indicate to me that I can emulate different devices by 
changing the names, IDs, and events.  Then I want to select only those 
events that pertain to my app... 

So...
-   Create a 'virtual' eventNN device based on the data fed to kbdd
-   Send various keyboard events to the kernel via the uinput device 
from several physical devices
-   Select only those events destined for my virtual device
-   Have those events pop out of my eventNN device so I can handle them 
back in userspace

How do I do that?  Where can I find some information on how to handle 
uinput devices?

Thanks,

--Yan

-- 
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Yan Seiner      (_)\(_)       ,>/'_     o__
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Who says engineers have to be pencil necked geeks?  (_)\(_)

Help out my kids' school: http://www.seiner.com/blog/Travels/

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