linux-kernel - Re: [RFC][PATCH] gpiolib: add irq_wake (power-management) sysfs file

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Date:	Mon, 21 Nov 2011 08:47:51 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Patrick Combes <p-combes@...com>
Cc:	grant.likely@...retlab.ca, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, Hugo Dupras <h-dupras@...com>
Subject: Re: [RFC][PATCH] gpiolib: add irq_wake (power-management) sysfs file

On Fri, Nov 11, 2011 at 10:40 AM, Patrick Combes <p-combes@...com> wrote:

> This patch creates a new sysfs file /sys/class/gpio/gpioN/irq_wake to enable
> usermode application to set the wake properties of a gpio IRQ.
> This option can be set or not for each gpio to preserve power consumption (e.g
> embedded systems).
(...)
> +       if (!test_bit(FLAG_EXPORT, &desc->flags))
> +               status = -EIO;
> +       else if (sysfs_streq(buf, "enable") || sysfs_streq(buf, "1"))
> +               status = enable_irq_wake(gpio_to_irq(gpio));
> +       else if (sysfs_streq(buf, "disable") || sysfs_streq(buf, "0"))
> +               status = disable_irq_wake(gpio_to_irq(gpio));
> +       else
> +               status = -EINVAL;

As noted elsewhere, human-readable files go into debugfs.

sysfs rule is one file, one value.

Create a file ile named "irq_wakeup_enable" that works
like this:

cat wakeup_enable
0
echo 1 > wakeup_enable
cat wakeup_enable
1

Also document you new ABI in
Documentation/ABI/testing/*
and preferabley write some new words on it
in Documentation/gpio.txt too.

Thanks!
Linus Walleij
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