Hello there,
I'm new to the list and I'm new to kernel module developing, too.
I want to handle an Interrupt on an ARM processor... (at91).
The Interrupt is already handled by the module at91_timer (compiled into
kernel). the module registers it's interrupt this way:
ret = request_irq(AT91_ID_SYS, at91_rtc_interrupt,
IRQF_DISABLED | IRQF_SHARED,
"at91_rtc", pdev);
Shouldn't it be possible to register a second interrupt handler for
AT91_ID_SYS? Because that is a shared Interrupt... the handler has to check
if it is the interrupt it has to handle, like that:
rtsr = at91_sys_read(AT91_RTC_SR) & at91_sys_read(AT91_RTC_IMR);
if (rtsr) { /* this interrupt is shared! Is it ours? */
why can't I reqister another handler, this is how I do it:
ret = request_irq(AT91_ID_SYS, timer_interrupt, SA_SHIRQ,
AD_IRQ_DEVICE_NAME, NULL);
if( ret )
{
printk(KERN_ERR "IRQ %d already claimed :(\n", AT91_ID_SYS);
return ret;
}
that gives me just the message that the IRQ is already claimed.
Can somebody tell me that this is the right way to use shared IRQ's, or am I
totally wrong?
Hello to the whole list and greets and thanks for reading :)
Ole
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