/* * 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); 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) { 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");