Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Dummy IRQ handler driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * This module only registers itself as a handler that is specified to it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * by the 'irq' parameter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * The sole purpose of this module is to help with debugging of systems on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * which spurious IRQs would happen on disabled IRQ vector.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * Copyright (C) 2013 Jiri Kosina
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static int irq = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static irqreturn_t dummy_interrupt(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	static int count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	if (count == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 		printk(KERN_INFO "dummy-irq: interrupt occurred on IRQ %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 				irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 		count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	return IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static int __init dummy_irq_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	if (irq < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		printk(KERN_ERR "dummy-irq: no IRQ given.  Use irq=N\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	if (request_irq(irq, &dummy_interrupt, IRQF_SHARED, "dummy_irq", &irq)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		printk(KERN_ERR "dummy-irq: cannot register IRQ %d\n", irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	printk(KERN_INFO "dummy-irq: registered for IRQ %d\n", irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static void __exit dummy_irq_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	printk(KERN_INFO "dummy-irq unloaded\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	free_irq(irq, &irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) module_init(dummy_irq_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) module_exit(dummy_irq_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) MODULE_AUTHOR("Jiri Kosina");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) module_param_hw(irq, uint, irq, 0444);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) MODULE_PARM_DESC(irq, "The IRQ to register for");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) MODULE_DESCRIPTION("Dummy IRQ handler driver");