linux-kernel - Re: [PATCH] gpio: take in account the active low flag when configuring the gpio as an ouput

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Message-ID: <CAAVeFuJ6BP4JnVb6qD1DYXqPQ3zBKw8hb+xLqcmUjktOxAjdGA@mail.gmail.com>
Date:	Tue, 11 Feb 2014 13:22:44 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Jean-Jacques Hiblot <jjhiblot@...phandler.com>,
	Linus Walleij <linus.walleij@...aro.org>
Cc:	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	richard.genoud@...il.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: take in account the active low flag when
 configuring the gpio as an ouput

On Tue, Feb 11, 2014 at 12:03 AM, Jean-Jacques Hiblot
<jjhiblot@...phandler.com> wrote:
> The initial value of the gpio is passed to gpiod_direction_output. Currently
> this value is the raw value of the GPIO line, but it should be the logical
> value.

I think we have a patch that already does this:

http://www.kernelhub.org/?msg=390263&p=2

Linus said it would be merged for 3.15, but I am not seeing it in -next. Linus?

>
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...phandler.com>
> ---
>  drivers/gpio/gpiolib.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index 4e10b10..111a1f1 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -1751,6 +1751,9 @@ int gpiod_direction_output(struct gpio_desc *desc, int value)
>                 return -EINVAL;
>         }
>
> +       if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
> +               value = !value;
> +
>         /* GPIOs used for IRQs shall not be set as output */
>         if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) {
>                 gpiod_err(desc,
> --
> 1.8.5.3
>
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