dummy-irq: introduce a dummy IRQ handler driver (54f69b92) · Commits · 戴 / test

drivers/misc/Kconfig

+8 −0

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		@@ -93,6 +93,14 @@ config ATMEL_TCB_CLKSRC_BLOCK
		TC can be used for other purposes, such as PWM generation and
		interval timing.

		config DUMMY_IRQ
		tristate "Dummy IRQ handler"
		default n
		---help---
		This module accepts a single 'irq' parameter, which it should register for.
		The sole purpose of this module is to help with debugging of systems on
		which spurious IRQs would happen on disabled IRQ vector.

		config IBM_ASM
		tristate "Device driver for IBM RSA service processor"
		depends on X86 && PCI && INPUT

+1 −0

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		@@ -13,6 +13,7 @@ obj-$(CONFIG_ATMEL_TCLIB) += atmel_tclib.o
		obj-$(CONFIG_BMP085) += bmp085.o
		obj-$(CONFIG_BMP085_I2C) += bmp085-i2c.o
		obj-$(CONFIG_BMP085_SPI) += bmp085-spi.o
		obj-$(CONFIG_DUMMY_IRQ) += dummy-irq.o
		obj-$(CONFIG_ICS932S401) += ics932s401.o
		obj-$(CONFIG_LKDTM) += lkdtm.o
		obj-$(CONFIG_TIFM_CORE) += tifm_core.o

0 → 100644

+59 −0

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		/*
		* 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;

		static irqreturn_t dummy_interrupt(int irq, void *dev_id)
		{
		static int count = 0;

		if (count == 0) {
		printk(KERN_INFO "dummy-irq: interrupt occured on IRQ %d\n",
		irq);
		count++;
		}

		return IRQ_NONE;
		}

		static int __init dummy_irq_init(void)
		{
		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");