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/*
* 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/interrupt.h>
#include <asm/mach-types.h>
extern void ctrl_alt_del(void);
static irqreturn_t nslu2_power_handler(int irq, void *dev_id, struct pt_regs *regs)
{
/* 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, struct pt_regs *regs)
{
/* 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);
gpio_line_isr_clear(NSLU2_RB_GPIO);
gpio_line_isr_clear(NSLU2_PB_GPIO);
if (request_irq(NSLU2_RB_IRQ, &nslu2_reset_handler,
SA_INTERRUPT, "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,
SA_INTERRUPT, "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)
{
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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