blob: fe3bfcb31a4cf4c3b6bc4333d899e3e5929a72b9 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
* Dummy IRQ handler driver.
* This module only registers itself as a handler that is specified to it
* by the 'irq' parameter.
* The sole purpose of this module is to help with debugging of systems on
* which spurious IRQs would happen on disabled IRQ vector.
* Copyright (C) 2013 Jiri Kosina
#include <linux/module.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
static int irq = -1;
static irqreturn_t dummy_interrupt(int irq, void *dev_id)
static int count = 0;
if (count == 0) {
printk(KERN_INFO "dummy-irq: interrupt occurred on IRQ %d\n",
return IRQ_NONE;
static int __init dummy_irq_init(void)
if (irq < 0) {
printk(KERN_ERR "dummy-irq: no IRQ given. Use irq=N\n");
return -EIO;
if (request_irq(irq, &dummy_interrupt, IRQF_SHARED, "dummy_irq", &irq)) {
printk(KERN_ERR "dummy-irq: cannot register IRQ %d\n", irq);
return -EIO;
printk(KERN_INFO "dummy-irq: registered for IRQ %d\n", irq);
return 0;
static void __exit dummy_irq_exit(void)
printk(KERN_INFO "dummy-irq unloaded\n");
free_irq(irq, &irq);
MODULE_AUTHOR("Jiri Kosina");
module_param_hw(irq, uint, irq, 0444);
MODULE_PARM_DESC(irq, "The IRQ to register for");
MODULE_DESCRIPTION("Dummy IRQ handler driver");