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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 in-
     terrupt polarity and trigger mode to parent buses.	 This typically	bub-
     bles all the way up to the	root bus (e.g. nexus) where the	necessary ac-
     tions 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 in-
			   terrupt line	transitions and	remains	unchanged af-
			   ter that until the interrupt	has been serviced, af-
			   ter 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 15, 2017				   BSD

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | HISTORY | AUTHORS

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