request_irq(9)
NAME
request_irq - allocate an interrupt line
SYNOPSIS
int request_irq(unsigned int irq, irq_handler_t handler,
unsigned long irqflags, const char * devname,
void * dev_id);
ARGUMENTS
- irq
- Interrupt line to allocate
- handler
- Function to be called when the IRQ occurs
- irqflags
- Interrupt type flags
- devname
- An ascii name for the claiming device
- dev_id
- A cookie passed back to the handler function
DESCRIPTION
This call allocates interrupt resources and enables the interrupt line
and IRQ handling. From the point this call is made your handler
function may be invoked. Since your handler function must clear any
interrupt the board raises, you must take care both to initialise your
hardware and to set up the interrupt handler in the right order.
Dev_id must be globally unique. Normally the address of the device data
structure is used as the cookie. Since the handler receives this value
it makes sense to use it.
If your interrupt is shared you must pass a non NULL dev_id as this is
required when freeing the interrupt.
FLAGS
IRQF_SHARED Interrupt is shared IRQF_DISABLED Disable local interrupts
while processing IRQF_SAMPLE_RANDOM The interrupt can be used for
entropy