Interrupt registering for PIO problem in ATMEL chips

[biswa.nayak at wipro.com]

Hello List,
I have a strange issue with dealing with interrupts in a ATMEL chip as
described below. 

As per the documentations, the peripherals of my board (custom one based
on AT91SAM9260) are connected to the Advanced Interrupt Controller (AIC)
of the ATMEL chip via the Parallel I/O (PIO) chips. 
Also, PIOs can not distinguish between inputs and interrupts, as they
treat everything as inputs. 

Now, my problem is I am writing this keypad driver, which is connected
to PIOA. 
I am able to read the key press event if I keep reading the PIO lines in
a loop. 

Now, I need to read the key press events in an interrupt handler (but
obvious) How exactly can I install an interrupt handler? 

The PIOA is connected to pin 2 of AIC, but then I can not install the
handler for pin2, It fails saying error -22 ( resource not available).
I also don't know, what I can do even if I get to install the handler
for PIO. 

Can someone guide me in this? Or atleast point to me some driver codes
which handles such situations. 

I would really appreciate some help on this, as I have hit a roadblock
here. 
Please, let me know if you need more info on this.

Thanks
Biswa

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