On Thu, 21 Feb 2008, Pioz wrote:
> 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):
[ ... ]
> res = request_irq (1, irq_myhandler, IRQF_SHARED, "bao", dev_id);
[ ... ]
> 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...
The check in setup_irq() very probably triggers for you:
/*
* Can't share interrupts unless both agree to and are
* the same type (level, edge, polarity). So both flag
* fields must have IRQF_SHARED set and the bits which
* set the trigger type must match.
*/
if (!((old->flags & new->flags) & IRQF_SHARED) ||
((old->flags ^ new->flags) & IRQF_TRIGGER_MASK)) {
old_name = old->name;
goto mismatch;
}
--
Jiri Kosina
SUSE Labs
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