* Interrupt handler registration for multiple devices
@ 2006-08-30 15:12 Rick Brown
2006-08-30 15:29 ` Octavian Purdila
2006-08-30 19:38 ` Alan Cox
0 siblings, 2 replies; 3+ messages in thread
From: Rick Brown @ 2006-08-30 15:12 UTC (permalink / raw)
To: linux-newbie, kernelnewbies, linux-kernel
Hi,
I want to write a driver that will handle multiple devices. These
devices will share the IRQ line. Do I need to register my (same)
interrupt handler as many times as the number of devices(by calling
request_irq())?
Also an unrelated query. Can I sleep after a call to preempt_kernel()??
TIA,
Rick
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Interrupt handler registration for multiple devices
2006-08-30 15:12 Interrupt handler registration for multiple devices Rick Brown
@ 2006-08-30 15:29 ` Octavian Purdila
2006-08-30 19:38 ` Alan Cox
1 sibling, 0 replies; 3+ messages in thread
From: Octavian Purdila @ 2006-08-30 15:29 UTC (permalink / raw)
To: kernelnewbies; +Cc: Rick Brown, linux-newbie
On Wednesday 30 August 2006 18:12, Rick Brown wrote:
> Hi,
>
> I want to write a driver that will handle multiple devices. These
> devices will share the IRQ line. Do I need to register my (same)
> interrupt handler as many times as the number of devices(by calling
> request_irq())?
>
No, once will suffice. However, you will need to check your devices registers
and figure out which device triggered the interrupt.
tavi
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Interrupt handler registration for multiple devices
2006-08-30 15:12 Interrupt handler registration for multiple devices Rick Brown
2006-08-30 15:29 ` Octavian Purdila
@ 2006-08-30 19:38 ` Alan Cox
1 sibling, 0 replies; 3+ messages in thread
From: Alan Cox @ 2006-08-30 19:38 UTC (permalink / raw)
To: Rick Brown; +Cc: linux-newbie, kernelnewbies, linux-kernel
Ar Mer, 2006-08-30 am 20:42 +0530, ysgrifennodd Rick Brown:
> Hi,
>
> I want to write a driver that will handle multiple devices. These
> devices will share the IRQ line. Do I need to register my (same)
> interrupt handler as many times as the number of devices(by calling
> request_irq())?
Up to you. If you are working with standard devices that need no special
handling to share interrupts (eg PCI bus), the device model makes it
more natural to do that and let the kernel call your handler once for
each device (passing a different dev_id).
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^ permalink raw reply [flat|nested] 3+ messages in thread
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