On Mon, Aug 15, 2011 at 7:03 PM, radhika bhaskaran <[email protected]>wrote:
> Hi javier, > > Thanks for the help. > > I have tried the suggestion made by you. But unfortunately it did not work. > > For my debugging purpose i tried to register two isr's on the same number > IRQ no in the same driver. But the isr which is registerd first is being > hit. > > The other isr funciton which is registered after the first isr is never > executed. > > Any more suggestions? > > IRQ_SHARED flag could work if IRQ_ONESHOT isn't enabled. In your request_threaded_irq(), you assigned thread_func() and NULL for handler_func(). It means that IRQ_ONESHOT is enabled. You either registered it to handler_func(), or abandon irq handler sharing between multiple drivers. > > On Sun, Aug 14, 2011 at 6:31 AM, Javier Martinez Canillas < > [email protected]> wrote: > >> On Sat, Aug 13, 2011 at 9:25 PM, radhika bhaskaran <[email protected]> >> wrote: >> > Hi, >> > I have a question with respect to request_threaded_irq. >> > Assume that one driver has registered and ISR on some particular irq >> number. >> > Can i use the same irq number and register and isr in another driver. >> > Because that is my requirement. >> > when i try to do that is an error message with an error no as -19. >> > err = request_threaded_irq(pdata->irq , NULL, testing_fucntion, >> > IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, >> > "testing_function", dev); >> > Can some one please help me whether it is possible. >> > Regards, >> > RB >> >> You have to use the IRQF_SHARED flag that specifies the IRQ will be >> shared for two devices: >> >> err = request_threaded_irq(pdata->irq , NULL, testing_fucntion, >> IRQF_SHARED | >> IRQF_TRIGGER_FALLING | >> IRQF_TRIGGER_RISING, >> "testing_function", dev); >> >> Have in mind that the kernel invokes every handler registered for that >> IRQ every time an interrupt occurs on that line. So you have to check >> in each ISR if the hardware raised the interrupt. >> >> Hope it helps, >> >> -- >> Javier MartÃnez Canillas >> (+34) 682 39 81 69 >> Barcelona, Spain >> > > > _______________________________________________ > Kernelnewbies mailing list > [email protected] > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > >
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