BUS_CONFIG_INTR(9) FreeBSD Kernel Developer's Manual BUS_CONFIG_INTR(9)
NAME
BUS_CONFIG_INTR, bus_config_intr - configure interrupt polarity and
trigger mode
SYNOPSIS
#include <sys/param.h>
#include <sys/bus.h>
int
BUS_CONFIG_INTR(device_t bus, device_t dev, int irq,
enum intr_trigger trig, enum intr_polarity pol);
int
bus_config_intr(device_t dev, int irq, enum intr_trigger trig,
enum intr_polarity pol);
DESCRIPTION
The BUS_CONFIG_INTR() method allows bus or device drivers to provide
interrupt polarity and trigger mode to parent buses. 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_SETUP_INTR(9).
The bus_config_intr() function is a simple wrapper around
BUS_CONFIG_INTR().
The trig argument can be one of:
INTR_TRIGGER_CONFORM The interrupt trigger mode is standard for the bus
to which the device is attached.
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 original 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 interrupt has been serviced,
after which the signal transitions back.
The pol argument can be any one of:
INTR_POLARITY_CONFORM The interrupt polarity is standard 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.
RETURN VALUES
Zero is returned on success, otherwise an appropriate error is returned.
SEE ALSO
BUS_SETUP_INTR(9), BUS_TEARDOWN_INTR(9), device(9), driver(9)
HISTORY
The BUS_CONFIG_INTR() method first appeared in FreeBSD 5.2.
AUTHORS
This manual page was written by Marcel Moolenaar <
[email protected]>.
FreeBSD 14.1-RELEASE-p8 January 16, 2025 FreeBSD 14.1-RELEASE-p8