BUS_CONFIG_INTR man page on FreeBSD

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BUS_CONFIG_INTR(9)	 BSD Kernel Developer's Manual	    BUS_CONFIG_INTR(9)

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⟩.

BSD				January 6, 2005				   BSD
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