Re: [PATCH] input: add support for generic GPIO-based matrix keypad

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Dmitry Torokhov wrote:
> Hi Eric,
> 
> On Fri, Jun 12, 2009 at 09:26:43PM +0800, Eric Miao wrote:
>> Hi Dmitry,
>>
>> I've tested the driver code, and it's basically OK except for two minor
>> fixes:
>>
>> 1) GPIO and IRQs have to be initialized before input_register_device(),
>> otherwise input->open() will be invoked before that, which will schedule
>> an immediate scan work and fail.
>>
>> 2) disable_irq_rows() called in init_matrix_gpio() so that by default it's
>> initialized to disabled - and will be enabled by input->open()
>>
> 
> Could you please take a look at the driver as it is commited to
> 'for-linus' branch of my tree and let me know if you see anything wrong
> there? Otherwise I inted to submit it in my next update to Linus.
> 

Sorry Dmitry,

Reply so late and til now I have some time to test this. The patch there
still has at least one issue I guess - the keycodes[] allocation size
should be MATRIX_MAX_ROWS * MATRIX_MAX_COLS if I understand correctly.

I'm experiencing a problem of keypad->pdata being overwritten, and found
keycodes are actually accessed by [(row << 4) + col], so that should be
a full range.

And one more minor issue that may not be significant is the hardcoding of
the '4' in this (row << 4).

Some of the key hits on my Littleton just worked smoothly with the above
correction, but not all - some key hits just gave intermittent events, I
have no idea how's that - maybe related to my scan delay and debouncing
settings

> Thanks!
> 

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