mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
d2912cb15b
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
// 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",
|
|
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_hw(irq, uint, irq, 0444);
|
|
MODULE_PARM_DESC(irq, "The IRQ to register for");
|
|
MODULE_DESCRIPTION("Dummy IRQ handler driver");
|