Keyboard interruption replacement For Linux module programming

Linux module programming keyboard interrupt replacement-Linux general technology-Linux programming and kernel information, the following is a detailed description. Replaced the module programming keyboard interrupt ..

Only 40 lines of code... You have to restart to restore the original keyboard interruption ..

Register the interrupt handler first.

Use tasklet In the interrupt processing function.

Of course, there are also functions for reading the keyboard.

Pay attention to the original function matching problem. The kernel versions may be different. The header file may be different.

/* The interrupt module, repalce the keyboard interrupt
* Edit by bo-liu
* 07-5-21
*/

# Include
# Include
# Include
# Include
# Include

MODULE_AUTHOR ("BO-LIU ");
MODULE_LICENSE ("GPL ");

Static unsigned char scancode;
Static void kbd_do_tasklet (unsigned long unused );
DECLARE_TASKLET (kbd_tasklet, kbd_do_tasklet, 0 );

Static void kbd_handler (int irq, void * dev_id, struct pt_regs * regs ){
// While (! (Inb (0x64) & 1 ));
Wait:
If (! (Inb (0x64) & 1 ))
Goto wait;
Scancode = inb (0x60 );
Tasklet_schedule (& kbd_tasklet );
}

Static void kbd_do_tasklet (unsigned long unused ){
Printk ("scancode % x % s.", scancode & 0x7f, (scancode & 0x80 )? "Released": "pressed ");
}

Static int kbd_init (void ){
Free_irq (1, NULL );
Request_irq (1, kbd_handler, 0, "keyboard", NULL );

}

Static void kbd_cleanup (void ){
Free_irq (1, NULL );
}


Module_init (kbd_init );
Module_exit (kbd_cleanup );