5.6.2. Interrupt Handling

• simple! Write a handler:

irqreturn_t handler(int irq, void *dev_id);

• register it with the kernel...

int request_irq(unsigned int irq,
          irq_handler_t handler,
       unsigned long irqflags,
       const char *devname,
       void * dev_id);

• ...enable device to generate interrupts

int fiddle_with_registers();

• and handle! (when done undo in reverse order)

• But... this is not the case anymore for ARCH=powerpc! (but still for ARM)

• Virtual vs. real interrupts