bus_config_intr(9)

NAME

#include <sys/param.h>
#include <sys/bus.h>
int
BUS_CONFIG_INTR(device_t  dev,  int  irq,  enum intr_trigger
trig,
        enum intr_polarity pol);

The BUS_CONFIG_INTR() method allows bus or device drivers to
provide interrupt polarity and trigger mode to parent busses. This
typically bubbles all the way up to the root bus (e.g. nexus) where
the necessary actions are taken to actually program the hardware. Since
the
BUS_CONFIG_INTR() method takes an interrupt number, it is
assumed but not necessarily required that it is called prior to BUS_SET
UP_INTR(9).
The trig argument can be one of:
INTR_TRIGGER_CONFORM The interrupt trigger mode is
standard for the: bus to which the device is at; tached.
INTR_TRIGGER_EDGE The interrupt is edge triggered.
This means: that the interrupt is raised by; the rising edge
of the signal on the interrupt; line. The signal typically reverts to the orig; inal state so
as to cause a spike.
INTR_TRIGGER_LEVEL The interrupt is level triggered.
This means: that the interrupt is raised when; the signal on
the interrupt line transitions and; remains
unchanged after that until the in; terrupt has
been serviced, after which the; signal transitions back.
The pol argument can be any one of:
INTR_POLARITY_CONFORM The interrupt polarity is stan
dard for the bus: to which the device is attached.
INTR_POLARITY_HIGH The interrupt is activated by a
high voltage: on the interrupt line.
INTR_POLARITY_LOW The interrupt is activated by a
low voltage on: the interrupt line.

The BUS_CONFIG_INTR() method first appeared in FreeBSD 5.2.