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/*
* arch/arm/mach-ns9xxx/gpio.c
*
* Copyright (C) 2006-2008 by Digi International Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
#include <linux/compiler.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <asm/bug.h>
#include <asm/types.h>
#include <asm/bitops.h>
#include <mach/gpio.h>
#include <mach/processor.h>
DEFINE_SPINLOCK(gpio_lock);
/* only access gpiores with atomic ops */
static DECLARE_BITMAP(gpiores, NS9XXX_NUM_GPIO);
int gpio_request(unsigned gpio, const char *label)
{
if (likely(gpio_issocgpio(gpio)))
return test_and_set_bit(gpio, gpiores) ? -EBUSY : 0;
else
return -EINVAL;
}
EXPORT_SYMBOL(gpio_request);
void gpio_free(unsigned gpio)
{
clear_bit(gpio, gpiores);
return;
}
EXPORT_SYMBOL(gpio_free);
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