All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
$FreeBSD$
.Dd January 15, 2017 .Dt BUS_CONFIG_INTR 9 .Os
.Sh NAME .Nm BUS_CONFIG_INTR .Nd "configure interrupt polarity and trigger mode"
.Sh SYNOPSIS n sys/param.h n sys/bus.h .Ft int .Fo BUS_CONFIG_INTR .Fa "device_t dev" "int irq" "enum intr_trigger trig" "enum intr_polarity pol" .Fc
.Sh DESCRIPTION The .Fn 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 .Fn BUS_CONFIG_INTR method takes an interrupt number, it is assumed but not necessarily required that it is called prior to .Xr BUS_SETUP_INTR 9 .
p The .Fa trig argument can be one of: l -tag -width ".Dv INTR_TRIGGER_CONFORM" t Dv INTR_TRIGGER_CONFORM The interrupt trigger mode is standard for the bus to which the device is attached. t Dv 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. t Dv 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. .El
p
The
.Fa pol
argument can be any one of:
l -tag -width ".Dv INTR_POLARITY_CONFORM" t Dv INTR_POLARITY_CONFORM The interrupt polarity is standard for the bus to which the device is attached.
t Dv INTR_POLARITY_HIGH The interrupt is activated by a high voltage on the interrupt line.
t Dv INTR_POLARITY_LOW The interrupt is activated by a low voltage on the interrupt line.
.El
.Sh RETURN VALUES
Zero is returned on success, otherwise an appropriate error is returned.
.Sh SEE ALSO
.Xr BUS_SETUP_INTR 9 ,
.Xr BUS_TEARDOWN_INTR 9 ,
.Xr device 9 ,
.Xr driver 9
.Sh HISTORY
The
.Fn BUS_CONFIG_INTR
method first appeared in
.Fx 5.2 .
.Sh AUTHORS
This manual page was written by
.An Marcel Moolenaar Aq Mt marcel@xcllnt.net .