Keyboard interrupt not working in x64 based machine on latest linux kernel

Question

Here is the basic kernel module that I have coded:

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/delay.h>

MODULE_LICENSE("GPL");
// irq number for keyboard is 1
static int irq = 1,  dev = 0xaa, counter = 0;

static irqreturn_t keyboard_handler(int irq, void *dev)
{
        pr_info("Keyboard Counter:%d\n", counter++);
        return IRQ_NONE;
}
/* registering irq */
static int test_interrupt_init(void)
{
        pr_info("%s: In init\n", __func__);
        return request_irq(irq, keyboard_handler, IRQF_SHARED,"my_keyboard_handler", &dev);
}

static void test_interrupt_exit(void)
{
        pr_info("%s: In exit\n", __func__);
        synchronize_irq(irq); /* synchronize interrupt */
        free_irq(irq, &dev);
}

module_init(test_interrupt_init);
module_exit(test_interrupt_exit);

This module counts the number of generated keyboard interrupts and prints it to the kernel printk circular buffer.

The problem is that the keyboard_handler is never getting executed.

Some debugging information that I want to share: Before loading this module, the output of sudo cat /proc/interrupts | less is

            CPU0       CPU1       CPU2       CPU3       CPU4       CPU5       CPU6       CPU7       CPU8       CPU9       CPU10      CPU11      CPU12      CPU13      CPU14      CPU15      
   1:          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0         93  IR-IO-APIC    1-edge      i8042

After loading the module, the output of the same command is

            CPU0       CPU1       CPU2       CPU3       CPU4       CPU5       CPU6       CPU7       CPU8       CPU9       CPU10      CPU11      CPU12      CPU13      CPU14      CPU15      
   1:          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0         93  IR-IO-APIC    1-edge      i8042, my_keyboard_handler

This suggests that my request_irq function call has registered my keyboard_handler successfully.

The dmesg output is:

[48485.839232] test_interrupt_init: In init
[48504.831010] test_interrupt_exit: In exit

The steps I have followed to get this dmesg output:

$ sudo insmod hello.ko
$ sdsds
sdsds: command not found
$ sudo rmmod hello

Details of the machine where I was trying to execute this code:

$ uname -r
5.18.0-4mx-amd64

I am using the MX-Linux distro

I was expecting the keyboard_handler function to get executed that will increase the counter variable to each keyboard interrupt and print its value in the kernel print buffer.

--Edited--

Note: The interrupt count value in my /proc/interrupts for IRQ1 is also not incrementing though I am pressing the keyboard buttons. Thanks to @Ian Abbott for pointing it out.

Answer 1

same question. Wonder if it has been solved...