From: Andrew Morton <akpm@linux-foundation.org>
To: Ben Gardner <gardner.ben@gmail.com>
Cc: Andres Salomon <dilinger@collabora.co.uk>,
linux-kernel@vger.kernel.org, stable@kernel.org
Subject: Re: [PATCH] cs5535_gpio: gpio_chip.get should return the input value
Date: Wed, 24 Feb 2010 20:05:59 -0800 [thread overview]
Message-ID: <20100224200559.fa911282.akpm@linux-foundation.org> (raw)
In-Reply-To: <808c8e9d1002241952s63633da3m471b6fb170558789@mail.gmail.com>
On Wed, 24 Feb 2010 21:52:07 -0600 Ben Gardner <gardner.ben@gmail.com> wrote:
> >> --- linux-2.6.33-rc8.orig/drivers/gpio/cs5535-gpio.c
> >> +++ linux-2.6.33-rc8/drivers/gpio/cs5535-gpio.c
> >> @@ -154,7 +154,7 @@
> >>
> >> __static int chip_gpio_get(struct gpio_chip *chip, unsigned offset)
> >> __{
> >> - __ __ return cs5535_gpio_isset(offset, GPIO_OUTPUT_VAL);
> >> + __ __ return cs5535_gpio_isset(offset, GPIO_READ_BACK);
> >> __}
> >>
> >> __static void chip_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
> >
> > <presses F10>
> >
> > What were the user-visible effects of this bug?
>
> The user-visible effects were that the input didn't work.
> I use the CS5535 chip in a custom board that uses GPIO 25 and 26 as
> voltage monitoring inputs (external voltage comparators).
> Since the char-based cs5535-gpio is now deprecated, I'm trying out the
> gpio driver.
> I export the GPIO pins via sysfs to access them from user-space.
> Reading the 'value' member didn't reflect the input.
OK, then in that case we'd want to backport this into 2.6.33.x and
perhaps earlier?
> Personally, I would prefer a separate sysfs entry for the output and
> the input, since the GPIO pins can be both outputs and inputs, but
> that would require a gpiolib change.
> Since there doesn't appear to be a gpio maintainer, any change to that
> might be tricky.
Eh, we can cope. Propose a patch and cc lots of people..
next prev parent reply other threads:[~2010-02-25 4:06 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-23 22:55 [PATCH] cs5535_gpio: gpio_chip.get should return the input value Ben Gardner
2010-02-24 22:58 ` Andrew Morton
2010-02-25 3:52 ` Ben Gardner
2010-02-25 4:05 ` Andrew Morton [this message]
2010-02-25 4:16 ` Ben Gardner
2010-02-25 5:04 ` Andres Salomon
2010-02-24 23:42 ` Andres Salomon
2010-02-24 23:45 ` [PATCH] OLPC: ALSA: fix cs5535audio's MIC GPIO to enable input Andres Salomon
2010-02-26 17:47 ` Ben Gardner
2010-02-26 21:07 ` Andres Salomon
2010-02-26 23:32 ` Ben Gardner
2010-03-01 14:55 ` Ben Gardner
2010-03-01 15:17 ` Andres Salomon
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