1.\"- 2.\" Copyright (c) 2007 Rui Paulo <rpaulo@FreeBSD.org> 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 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 ``AS IS'' AND ANY EXPRESS OR 15.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 16.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 17.\" DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 18.\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 19.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 20.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 22.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 23.\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 24.\" POSSIBILITY OF SUCH DAMAGE. 25.\" 26.\" $FreeBSD$ 27.\" 28.Dd November 10, 2007 29.Dt ASMC 4 30.Os 31.Sh NAME 32.Nm asmc 33.Nd device driver for the Apple System Management Console (SMC) 34.Sh SYNOPSIS 35To compile this driver into the kernel, place the following line in your 36kernel configuration file: 37.Bd -ragged -offset indent 38.Cd "device asmc" 39.Ed 40.Pp 41Alternatively, to load the driver as a 42module at boot time, place the following line in 43.Xr loader.conf 5 : 44.Bd -literal -offset indent 45asmc_load="YES" 46.Ed 47.Sh DESCRIPTION 48The 49.Nm 50driver controls the Apple System Management Console (SMC for short) 51found on Intel Apple systems. 52.Pp 53The SMC is known to be found on the following systems: 54.Pp 55.Bl -bullet -offset indent -compact 56.It 57MacBook (any generation) 58.It 59MacBook Pro (any generation) 60.It 61Intel MacMini 62.El 63.Pp 64With this driver, you can configure your keyboard backlight 65brightness, check temperatures of several sensors, check the speed of 66the internal fans and check the status of the Sudden Motion Sensor. 67.Pp 68Variables related to the SMC control and inspection are exported via 69.Xr sysctl 3 70under the device tree 71.Va dev.asmc . 72.Sh KEYBOARD BACKLIGHT 73On 74.Tn MacBook Pro 75systems, you can control the keyboard brightness by writing values to 76the 77.Va dev.asmc.%d.light.left 78or 79.Va dev.asmc.%d.light.right 80sysctl MIBs. 81.Pp 82Each of these sysctl MIBs contains the raw value returned by the left 83and right light sensors. 84.Sh TEMPERATURES 85The number of temperature sensors and their description varies among 86systems. 87You can inspect the temperature sensors on your system by traversing 88the 89.Va dev.asmc.temp 90sysctl MIB. 91.Pp 92All values are in degrees celsius. 93.Sh SYSTEM FANS 94The 95.Va dev.asmc.fan.%d 96sysctl tree contains the leaf nodes 97.Va speed , 98.Va safespeed , 99.Va minspeed , 100.Va maxspeed 101and 102.Va targetspeed . 103Each of these leaf nodes represent the current fan speed, the safest 104minimum fan speed, the mininum speed and the maximum speed 105respectively. 106.Pp 107All values are in RPM. 108.Sh SUDDEN MOTION SENSOR 109The Sudden Motion Sensor (SMS for short) is a device that detects 110laptop movement and notifies the operating system via an interrupt. 111The sysctl MIBs present under 112.Va dev.asmc.sms 113all relate to the SMS. 114.Pp 115The most interesting usage of this device is to park the disk heads 116when the laptop is moved harshly. 117First, you need to install 118.Xr ataidle 8 Pq Pa ports/sysutils/ataidle 119and then configure 120.Xr devd 8 121the following way: 122.Bd -literal -offset indent 123notify 0 { 124 match "system" "ISA"; 125 match "subsystem" "asmc"; 126 action "/usr/local/sbin/ataidle -s X Y"; 127}; 128.Ed 129.Pp 130Do not forget to change the 131.Ar X 132and 133.Ar Y 134values in the command above. 135.Pp 136Also, please note that parking the disk heads too many times can 137dramatically reduce your hard drive's life span. 138Do not rely solely on 139the SMS to protect your hard drive: good care and common sense can 140increase your hard drive's life. 141.Sh SEE ALSO 142.Xr ataidle 8 Pq Pa ports/sysutils/ataidle , 143.Xr devd 8 , 144.Xr sysctl 8 145.Sh HISTORY 146The 147.Nm 148driver first appeared in 149.Fx 8.0 . 150.Sh AUTHORS 151.An -nosplit 152.An Rui Paulo Aq rpaulo@FreeBSD.org 153(Google Summer of Code project). 154.Sh BUGS 155Support for the latest models was never tested and is most likely not 156fully working. 157