1.\" $OpenBSD: smu.4,v 1.11 2018/06/18 06:06:52 jmc Exp $ 2.\" 3.\" Copyright (c) 2005 Mark Kettenis 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd $Mdocdate: June 18 2018 $ 18.Dt SMU 4 macppc 19.Os 20.Sh NAME 21.Nm smu 22.Nd Apple System Management Unit 23.Sh SYNOPSIS 24.Cd "smu? at mainbus0" 25.Sh DESCRIPTION 26The 27.Nm 28driver provides support for the System Management Unit found on Apple 29.Tn iMac G5 30and some 31.Tn Power Mac G5 32machines. 33.Pp 34The System Management Unit controls the fans in these systems. 35It also contains the real-time clock and an I2C controller. 36.Sh SEE ALSO 37.Xr iic 4 , 38.Xr intro 4 39.Sh HISTORY 40The 41.Nm 42driver first appeared in 43.Ox 3.9 . 44.Sh AUTHORS 45The 46.Nm 47driver was written by 48.An Mark Kettenis . 49.Sh BUGS 50Fan control is not implemented yet. 51