NAME

gpiosim — General Purpose Input/Output Simulator

SYNOPSIS

pseudo-device gpiosim

DESCRIPTION

The gpiosim pseudo-device simulates a 64-bit wide gpio(4) device. The state of the simulated device can be manipulated through the sysctl(8) interface. For this purpose, access the "hw.gpiosim<N>.value" sysctl(8) variable, where "<N>" denotes the number of the gpiosim instance.

Both edge and level interrupts are simulated. The "hw.gpiosim<N>.ms" sysctl(8) variable will change the amount of time between callout(9) ticks for simulated level interrupts.

SEE ALSO

gpio(4), gpioirq(4), sysctl(8)

AUTHORS

The gpiosim driver was written by Marc Balmer <marc@msys.ch> Simulated interrupts added by Brad Spencer <brad@anduin.eldar.org>.