Interrupt handler prototype

irqreturn_t foo_interrupt (int irq, void *dev_id)

Arguments

• irq, the IRQ number

• dev_id, the opaque pointer passed at request_irq()

Return value

• IRQ_HANDLED: recognized and handled interrupt

• IRQ_NONE: not on a device managed by the module. Useful to share interrupt channels and/or report spurious interrupts to the kernel.