106 lines
3.5 KiB
Groff
106 lines
3.5 KiB
Groff
.\" Copyright (c) 2003 Marcel Moolenaar
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\"
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd January 6, 2005
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.Dt BUS_CONFIG_INTR 9
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.Os
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.\"
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.Sh NAME
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.Nm BUS_CONFIG_INTR
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.Nd "configure interrupt polarity and trigger mode"
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.\"
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/bus.h
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.Ft int
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.Fo BUS_CONFIG_INTR
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.Fa "device_t dev" "int irq" "enum intr_trigger trig" "enum intr_polarity pol"
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.Fc
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.\"
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.Sh DESCRIPTION
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The
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.Fn BUS_CONFIG_INTR
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method allows bus or device drivers to provide interrupt polarity and trigger
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mode to parent busses.
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This typically bubbles all the way up to the root bus (e.g.\& nexus) where the
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necessary actions are taken to actually program the hardware.
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Since the
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.Fn BUS_CONFIG_INTR
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method takes an interrupt number, it is assumed but not necessarily required
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that it is called prior to
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.Xr BUS_SETUP_INTR 9 .
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.Pp
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The
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.Fa trig
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argument can be one of:
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.Bl -tag -width ".Dv INTR_TRIGGER_CONFORM"
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.It Dv INTR_TRIGGER_CONFORM
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The interrupt trigger mode is standard for the bus to which the device is
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attached.
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.It Dv INTR_TRIGGER_EDGE
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The interrupt is edge triggered.
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This means that the interrupt is raised by the rising edge of the signal on
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the interrupt line.
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The signal typically reverts to the original state so as to cause a spike.
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.It Dv INTR_TRIGGER_LEVEL
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The interrupt is level triggered.
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This means that the interrupt is raised when the signal on the interrupt line
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transitions and remains unchanged after that until the interrupt has been
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serviced, after which the signal transitions back.
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.El
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.Pp
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The
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.Fa pol
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argument can be any one of:
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.Bl -tag -width ".Dv INTR_POLARITY_CONFORM"
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.It Dv INTR_POLARITY_CONFORM
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The interrupt polarity is standard for the bus to which the device is attached.
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.It Dv INTR_POLARITY_HIGH
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The interrupt is activated by a high voltage on the interrupt line.
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.It Dv INTR_POLARITY_LOW
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The interrupt is activated by a low voltage on the interrupt line.
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.El
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.\"
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.Sh RETURN VALUES
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Zero is returned on success, otherwise an appropriate error is returned.
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.\"
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.Sh SEE ALSO
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.Xr BUS_SETUP_INTR 9 ,
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.Xr BUS_TEARDOWN_INTR 9 ,
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.Xr device 9 ,
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.Xr driver 9
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.\"
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.Sh HISTORY
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The
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.Fn BUS_CONFIG_INTR
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method first appeared in
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.Fx 5.2 .
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.\"
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.Sh AUTHORS
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This manual page was written by
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.An Marcel Moolenaar Aq Mt marcel@xcllnt.net .
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