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nslu2-power.c

/*
 * arch/arm/mach-ixp4xx/nslu2-power.c
 *
 * NSLU2 Power/Reset driver
 *
 * Copyright (C) 2005 Tower Technologies
 *
 * based on nslu2-io.c
 *  Copyright (C) 2004 Karen Spearel
 *
 * Author: Alessandro Zummo <a.zummo@towertech.it>
 * Maintainers: http://www.nslu2-linux.org/
 *
 * 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/module.h>
#include <linux/reboot.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/reboot.h>

#include <asm/mach-types.h>

static irqreturn_t nslu2_power_handler(int irq, void *dev_id)
{
      /* Signal init to do the ctrlaltdel action, this will bypass init if
       * it hasn't started and do a kernel_restart.
       */
      ctrl_alt_del();

      return IRQ_HANDLED;
}

static irqreturn_t nslu2_reset_handler(int irq, void *dev_id)
{
      /* This is the paper-clip reset, it shuts the machine down directly.
       */
      machine_power_off();

      return IRQ_HANDLED;
}

static int __init nslu2_power_init(void)
{
      if (!(machine_is_nslu2()))
            return 0;

      *IXP4XX_GPIO_GPISR = 0x20400000;    /* read the 2 irqs to clr */

      set_irq_type(NSLU2_RB_IRQ, IRQT_LOW);
      set_irq_type(NSLU2_PB_IRQ, IRQT_HIGH);

      if (request_irq(NSLU2_RB_IRQ, &nslu2_reset_handler,
            IRQF_DISABLED, "NSLU2 reset button", NULL) < 0) {

            printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
                  NSLU2_RB_IRQ);

            return -EIO;
      }

      if (request_irq(NSLU2_PB_IRQ, &nslu2_power_handler,
            IRQF_DISABLED, "NSLU2 power button", NULL) < 0) {

            printk(KERN_DEBUG "Power Button IRQ %d not available\n",
                  NSLU2_PB_IRQ);

            return -EIO;
      }

      return 0;
}

static void __exit nslu2_power_exit(void)
{
      if (!(machine_is_nslu2()))
            return;

      free_irq(NSLU2_RB_IRQ, NULL);
      free_irq(NSLU2_PB_IRQ, NULL);
}

module_init(nslu2_power_init);
module_exit(nslu2_power_exit);

MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
MODULE_DESCRIPTION("NSLU2 Power/Reset driver");
MODULE_LICENSE("GPL");

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