NAME

       BUS_CONFIG_INTR — configure interrupt polarity and trigger mode

SYNOPSIS

       #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);

DESCRIPTION

       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_SETUP_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 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 ⟨marcel@xcllnt.net⟩.

Debian                                           January 6, 2005                              BUS_CONFIG_INTR(9)