65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
/*
|
|
* 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
|
|
*/
|
|
|
|
/*
|
|
* 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/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",
|
|
irq);
|
|
count++;
|
|
}
|
|
|
|
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_init(dummy_irq_init);
|
|
module_exit(dummy_irq_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Jiri Kosina");
|
|
module_param(irq, uint, 0444);
|
|
MODULE_PARM_DESC(irq, "The IRQ to register for");
|
|
MODULE_DESCRIPTION("Dummy IRQ handler driver");
|