90 lines
2.0 KiB
C
90 lines
2.0 KiB
C
/*
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* arch/arm/mach-ixp4xx/nslu2-power.c
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*
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* NSLU2 Power/Reset driver
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*
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* Copyright (C) 2005 Tower Technologies
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*
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* based on nslu2-io.c
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* Copyright (C) 2004 Karen Spearel
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*
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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* Maintainers: http://www.nslu2-linux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/reboot.h>
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#include <linux/interrupt.h>
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#include <asm/mach-types.h>
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extern void ctrl_alt_del(void);
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static irqreturn_t nslu2_power_handler(int irq, void *dev_id, struct pt_regs *regs)
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{
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/* Signal init to do the ctrlaltdel action, this will bypass init if
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* it hasn't started and do a kernel_restart.
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*/
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ctrl_alt_del();
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return IRQ_HANDLED;
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}
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static irqreturn_t nslu2_reset_handler(int irq, void *dev_id, struct pt_regs *regs)
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{
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/* This is the paper-clip reset, it shuts the machine down directly.
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*/
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machine_power_off();
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return IRQ_HANDLED;
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}
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static int __init nslu2_power_init(void)
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{
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if (!(machine_is_nslu2()))
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return 0;
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*IXP4XX_GPIO_GPISR = 0x20400000; /* read the 2 irqs to clr */
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set_irq_type(NSLU2_RB_IRQ, IRQT_LOW);
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set_irq_type(NSLU2_PB_IRQ, IRQT_HIGH);
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if (request_irq(NSLU2_RB_IRQ, &nslu2_reset_handler,
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SA_INTERRUPT, "NSLU2 reset button", NULL) < 0) {
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printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
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NSLU2_RB_IRQ);
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return -EIO;
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}
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if (request_irq(NSLU2_PB_IRQ, &nslu2_power_handler,
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SA_INTERRUPT, "NSLU2 power button", NULL) < 0) {
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printk(KERN_DEBUG "Power Button IRQ %d not available\n",
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NSLU2_PB_IRQ);
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return -EIO;
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}
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return 0;
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}
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static void __exit nslu2_power_exit(void)
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{
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free_irq(NSLU2_RB_IRQ, NULL);
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free_irq(NSLU2_PB_IRQ, NULL);
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}
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module_init(nslu2_power_init);
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module_exit(nslu2_power_exit);
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MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
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MODULE_DESCRIPTION("NSLU2 Power/Reset driver");
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MODULE_LICENSE("GPL");
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