Re: [PATCH] Input: gpio-keys: Support for one-directional interrupts

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On Wed, Dec 9, 2009 at 3:32 AM, Ferenc Wagner <wferi@xxxxxxx> wrote:
> Cory Maccarrone <darkstar6262@xxxxxxxxx> writes:
>
> Interesting.  Btw. I'd like to convert gpio-keys from edge-triggered to
> level-triggered interrupts.  Would that work for your hardware?

I'm fairly certain it wouldn't.  Each of the interrupts on my hardware
has a corresponding bit in a control register that determines if it's
rising or falling-edge triggered -- thus the need for my patch.  To
capture both directions, it's necessary to modify the control register
when a falling edge is detected, so that the corresponding rising edge
can be collected afterward.  May I ask why you're thinking of
converting to level-triggering?

Perhaps it would be better to provide an option in the platform_device
structure to set edge- or level-triggering, similar to the change I'm
proposing for interrupts that can only signal one way at a time.

- Cory
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