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Old 02-21-2008, 10:10 AM   #1
Pioz
LQ Newbie
 
Registered: Feb 2008
Posts: 2

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Keyboard interrupt - request_irq()


Hi all,
I have a problem.
I want handle the keyboard interrupt and for this purpose I have write
this module (I have kernel 2.6.23):


Code:
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>

[...]

irqreturn_t
irq_myhandler (int irqn, void *dev)
{
       printk (KERN_INFO "Key pressed...\n");
       return IRQ_HANDLED;
}

int
init_module ()
{
       int res;
       printk (KERN_INFO "Hello World!\n");
       free_irq (1, NULL);
       res = request_irq (1, irq_myhandler, IRQF_SHARED, "bao", dev_id);
       printk (KERN_INFO "res: %d\n", res);
       return 0;
}

void
cleanup_module ()
{
       free_irq (1, NULL);
       printk (KERN_INFO "Goodbye World!\n");
}

The return value of request_irq() function is -EBUSY. Why? Is the
default handler? How can I do to change handler with my function?
Thanks...
 
  


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