Interrupt registering for PIO problem in ATMEL chips

[hemanthv@ti.com (Hemanth V)]

----- Original Message ----- 
From: <biswa.nayak@wipro.com>
To: <linux-arm-kernel@lists.infradead.org>
Sent: Monday, February 22, 2010 2:06 PM
Subject: Interrupt registering for PIO problem in ATMEL chips


> 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.

Have u looked at driver/input/keyboard, which should
provide some examples

> Please, let me know if you need more info on this.
>
> Thanks
> Biswa
>
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