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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Message-ID: <74d0deb30805120427x71b4588es9200f80252bab319@mail.gmail.com>
Date:	Mon, 12 May 2008 13:27:24 +0200
From:	"pHilipp Zabel" <philipp.zabel@...il.com>
To:	"Bryan Wu" <cooloney@...nel.org>
Cc:	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

Hi,

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?

>  +
>  +#define GPIOKEYS_EDGE_SENSE(x) set_gpio_edge(gpio, x)
>  +#else
>  +#define GPIOKEYS_EDGE_SENSE(x) do {} while (0)
>  +#endif
>  +
>   static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
>   {
>         int i;
>  @@ -39,8 +51,9 @@ static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
>
>                 if (irq == gpio_to_irq(gpio)) {
>                         unsigned int type = button->type ?: EV_KEY;
>  +                       GPIOKEYS_EDGE_SENSE(0);
>                         int state = (gpio_get_value(gpio) ? 1 : 0) ^ button->active_low;
>  -
>  +                       GPIOKEYS_EDGE_SENSE(1);
>                         input_event(input, type, button->code, !!state);
>                         input_sync(input);
>                         return IRQ_HANDLED;
>  --
>  1.5.5
>
>

regards
Philipp
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