.\" $NetBSD: gpiosim.4,v 1.6.16.1 2023/11/26 12:13:19 bouyer Exp $
.\"
.\" Copyright (c) 2009, 2013 Marc Balmer <marc@msys.ch>
.\" All rights reserved.
.\"
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.\"
.Dd November 8, 2013
.Dt GPIOSIM 4
.Os
.Sh NAME
.Nm gpiosim
.Nd General Purpose Input/Output Simulator
.Sh SYNOPSIS
.Cd "pseudo-device gpiosim"
.Sh DESCRIPTION
The
.Nm
pseudo-device simulates a 64-bit wide
.Xr gpio 4
device.
The state of the simulated device can be manipulated through the
.Xr sysctl 8
interface.
For this purpose, access the "hw.gpiosim<N>.value"
.Xr sysctl 8
variable, where "<N>" denotes the number of the
.Nm
instance.
.Pp
Both edge and level interrupts are simulated.  The "hw.gpiosim<N>.ms"
.Xr sysctl 8
variable will change the amount of time between
.Xr callout 9
ticks for simulated level interrupts.
.Sh SEE ALSO
.Xr gpio 4 ,
.Xr gpioirq 4 ,
.Xr sysctl 8
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was written by
.An Marc Balmer Aq Mt marc@msys.ch
Simulated interrupts added by
.An Brad Spencer Aq Mt brad@anduin.eldar.org .