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gpio.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net>
 */

#include <linux/ssb/ssb.h>
#include <linux/ssb/ssb_driver_chipcommon.h>
#include <linux/ssb/ssb_driver_extif.h>
#include <asm/mach-bcm47xx/bcm47xx.h>
#include <asm/mach-bcm47xx/gpio.h>

#if (BCM47XX_CHIPCO_GPIO_LINES > BCM47XX_EXTIF_GPIO_LINES)
static DECLARE_BITMAP(gpio_in_use, BCM47XX_CHIPCO_GPIO_LINES);
#else
static DECLARE_BITMAP(gpio_in_use, BCM47XX_EXTIF_GPIO_LINES);
#endif

int gpio_request(unsigned gpio, const char *tag)
{
      if (ssb_chipco_available(&ssb_bcm47xx.chipco) &&
          ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
            return -EINVAL;

      if (ssb_extif_available(&ssb_bcm47xx.extif) &&
          ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
            return -EINVAL;

      if (test_and_set_bit(gpio, gpio_in_use))
            return -EBUSY;

      return 0;
}
EXPORT_SYMBOL(gpio_request);

void gpio_free(unsigned gpio)
{
      if (ssb_chipco_available(&ssb_bcm47xx.chipco) &&
          ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
            return;

      if (ssb_extif_available(&ssb_bcm47xx.extif) &&
          ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
            return;

      clear_bit(gpio, gpio_in_use);
}
EXPORT_SYMBOL(gpio_free);

int gpio_to_irq(unsigned gpio)
{
      if (ssb_chipco_available(&ssb_bcm47xx.chipco))
            return ssb_mips_irq(ssb_bcm47xx.chipco.dev) + 2;
      else if (ssb_extif_available(&ssb_bcm47xx.extif))
            return ssb_mips_irq(ssb_bcm47xx.extif.dev) + 2;
      else
            return -EINVAL;
}
EXPORT_SYMBOL_GPL(gpio_to_irq);


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