linux-kernel - Re: [PATCH 1/1] [INPUT/KEYPAD] gpio keypad: Replace current blackfin specific pfbutton driver with kernel generic gpio key driver

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Date:	Mon, 12 May 2008 07:42:23 -0400
From:	"Mike Frysinger" <vapier.adi@...il.com>
To:	"pHilipp Zabel" <philipp.zabel@...il.com>
Cc:	"Bryan Wu" <cooloney@...nel.org>, dbrownell@...rs.sourceforge.net,
	dmitry.torokhov@...il.com, linux-kernel@...r.kernel.org,
	"Michael Hennerich" <michael.hennerich@...log.com>
Subject: Re: [PATCH 1/1] [INPUT/KEYPAD] gpio keypad: Replace current blackfin specific pfbutton driver with kernel generic gpio key driver

On Mon, May 12, 2008 at 7:27 AM, pHilipp Zabel <philipp.zabel@...il.com> wrote:
> On Mon, May 12, 2008 at 12:17 PM, Bryan Wu <cooloney@...nel.org> wrote:
>> From: Michael Hennerich <michael.hennerich@...log.com>
>>
>>  It's an actual deficiency in the hardware that we can't address,
>>  so it needs to be worked around in software.
>>
>>  Signed-off-by: Michael Hennerich <michael.hennerich@...log.com>
>>  Signed-off-by: Bryan Wu <cooloney@...nel.org>
>>  ---
>>   drivers/input/keyboard/gpio_keys.c |   15 ++++++++++++++-
>>   1 files changed, 14 insertions(+), 1 deletions(-)
>>
>>  diff --git a/drivers/input/keyboard/gpio_keys.c
b/drivers/input/keyboard/gpio_keys.c
>>  index bbd00c3..d856eb9 100644
>>  --- a/drivers/input/keyboard/gpio_keys.c
>>  +++ b/drivers/input/keyboard/gpio_keys.c
>>  @@ -26,6 +26,18 @@
>>
>>   #include <asm/gpio.h>
>>
>>  +#if defined(CONFIG_BLACKFIN) && !defined(BF548_FAMILY)
>>  +
>>  +/*
>>  + * On some Blackfin CPUs reading edge triggered
>>  + * GPIOs doesn't return the current value
>>  + */
>
> If this is a generic problem, shouldn't this be addressed inside gpio_get_value?

it's an issue only when the GPIO is an interrupt source and the
trigger condition is set to both rising and falling.  but i guess your
point is that in gpio_get_value(), we can check to see if these
conditions are met and if so, temporarily fiddle things there ?

Michael: that sounds reasonable, what do you think ?
-mike
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