1.\" Copyright (c) 2003 Marcel Moolenaar 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $FreeBSD$ 27.\" 28.Dd September 23, 2003 29.Dt BUS_CONFIG_INTR 9 30.Os 31.\" 32.Sh NAME 33.Nm BUS_CONFIG_INTR 34.Nd Configure interrupt polarity and trigger mode 35.\" 36.Sh SYNOPSIS 37.In sys/param.h 38.In sys/bus.h 39.Ft int 40.Fn BUS_CONFIG_INTR "device_t dev" "int irq" "enum intr_trigger trig" "enum intr_polarity pol" 41.\" 42.Sh DESCRIPTION 43The 44.Nm 45method allows bus or device drivers to provide interrupt polarity and trigger 46mode to parent busses. 47This typically bubbles all the way up to the root bus (e.g. nexus) where the 48necessary actions are taken to actually program the hardware. 49Since the 50.Nm 51method takes an interrupt number, it is assumed but not necessarily required 52that it is called prior to 53.Xr BUS_SETUP_INTR 9 . 54.Pp 55The 56.Fa trig 57argument can be one of 58.Bl -tag -width INTR_TRIGGER_CONFORM 59.It Dv INTR_TRIGGER_CONFORM 60The interrupt trigger mode is standard for the bus to which the device is 61attached. 62.It Dv INTR_TRIGGER_EDGE 63The interrupt is edge triggered. 64This means that the interrupt is raised by the rising edge of the signal on 65the interrupt line. 66The signal typically revert to the original state so as to cause a spike. 67.Dv INTR_TRIGGER_LEVEL 68The interrupt is level triggered. 69This means that the interrupt is raised when the signal on the interrupt line 70transitions and remains unchanged after that until the interrupt has been 71serviced, after which the signal transitions back. 72.El 73.Pp 74The 75.Fa pol 76argument can be any one of 77.Bl -tag -width INTR_POLARITY_CONFORM 78.It Dv INTR_POLARITY_CONFORM 79The interrupt polarity is standard for the bus to which the device is attached. 80.It Dv INTR_POLARITY_HIGH 81The interrupt is activated by a high voltage on the interrupt line. 82.It Dv INTR_POLARITY_LOW 83The interrupt is activated by a low voltage on the interrupt line. 84.El 85.\" 86.Sh RETURN VALUES 87Zero is returned on success, otherwise an appropriate error is returned. 88.\" 89.Sh SEE ALSO 90.Xr BUS_SETUP_INTR 9 , 91.Xr BUS_TEARDOWN_INTR 9 , 92.Xr device 9 , 93.Xr driver 9 94.\" 95.Sh HISTORY 96The 97.Nm 98method first appeared in 99.Fx 5.2 . 100.\" 101.Sh AUTHORS 102This manual page was written by 103.An Marcel Moolenaar 104.Aq marcel@xcllnt.net 105