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):
#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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