linux-kernel - gpiolib, irqs and error returns

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Message-ID: <9e4733910808312117i76f07e80n6979e7bbfc1b7c21@mail.gmail.com>
Date:	Mon, 1 Sep 2008 00:17:22 -0400
From:	"Jon Smirl" <jonsmirl@...il.com>
To:	lkml <linux-kernel@...r.kernel.org>,
	"David Brownell" <david-b@...bell.net>
Subject: gpiolib, irqs and error returns

>From Documentation/gpio.txt

        /* map GPIO numbers to IRQ numbers */
        int gpio_to_irq(unsigned gpio);

        /* map IRQ numbers to GPIO numbers */
        int irq_to_gpio(unsigned irq);

Those return either the corresponding number in the other namespace, or
else a negative errno code if the mapping can't be done.  (For example,
some GPIOs can't be used as IRQs.)  It is an unchecked error to use a GPIO
number that wasn't set up as an input using gpio_direction_input(), or
to use an IRQ number that didn't originally come from gpio_to_irq().

------------------------------------------------------------

Isn't an irq now an unsigned int? And the only possible error return
is NO_IRQ (ie 0).

-- 
Jon Smirl
jonsmirl@...il.com
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