linux-kernel - Re: [PATCH] gpio sysfs: add a "toggle" value

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Date:	Thu, 4 Jun 2009 00:54:35 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mike Frysinger <vapier@...too.org>
Cc:	David Brownell <david-b@...bell.net>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio sysfs: add a "toggle" value

On Wed,  3 Jun 2009 04:16:59 -0400 Mike Frysinger <vapier@...too.org> wrote:

> Signed-off-by: Mike Frysinger <vapier@...too.org>

-ENOCHANGELOGAGAIN

> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index 51a8d41..7f79732 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -274,7 +274,12 @@ static ssize_t gpio_value_store(struct device *dev,
>  	else {
>  		long		value;
>  
> -		status = strict_strtol(buf, 0, &value);
> +		if (sysfs_streq(buf, "toggle")) {
> +			value = !gpio_get_value_cansleep(gpio);
> +			status = 0;
> +		} else
> +			status = strict_strtol(buf, 0, &value);
> +
>  		if (status == 0) {
>  			gpio_set_value_cansleep(gpio, value != 0);
>  			status = size;

A suitable place to document this is Documentation/gpio.txt.
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