2  * Dummy IRQ handler driver.
5  * by the 'irq' parameter.
8  * which spurious IRQs would happen on disabled IRQ vector.
19 #include <linux/irq.h>
22 static int irq = -1;  variable
24 static irqreturn_t dummy_interrupt(int irq, void *dev_id)  in dummy_interrupt()  argument
29 		printk(KERN_INFO "dummy-irq: interrupt occurred on IRQ %d\n",  in dummy_interrupt()
30 				irq);  in dummy_interrupt()
39 	if (irq < 0) {  in dummy_irq_init()
40 		printk(KERN_ERR "dummy-irq: no IRQ given.  Use irq=N\n");  in dummy_irq_init()
43 	if (request_irq(irq, &dummy_interrupt, IRQF_SHARED, "dummy_irq", &irq)) {  in dummy_irq_init()
44 		printk(KERN_ERR "dummy-irq: cannot register IRQ %d\n", irq);  in dummy_irq_init()
47 	printk(KERN_INFO "dummy-irq: registered for IRQ %d\n", irq);  in dummy_irq_init()
53 	printk(KERN_INFO "dummy-irq unloaded\n");  in dummy_irq_exit()
54 	free_irq(irq, &irq);  in dummy_irq_exit()
62 module_param_hw(irq, uint, irq, 0444);
63 MODULE_PARM_DESC(irq, "The IRQ to register for");
64 MODULE_DESCRIPTION("Dummy IRQ handler driver");