power_profile revision 174464 
1#!/bin/sh
2#
3# Modify the power profile based on AC line state.  This script is
4# usually called from devd(8).
5#
6# Arguments: 0x00 (AC offline, economy) or 0x01 (AC online, performance)
7#
8# $FreeBSD: head/etc/rc.d/power_profile 174464 2007-12-08 23:00:28Z dougb $
9#
10
11# PROVIDE: power_profile
12# REQUIRE: FILESYSTEMS syslogd
13# KEYWORD: nojail nostart
14
15. /etc/rc.subr
16
17name="power_profile"
18stop_cmd=':'
19LOGGER="logger -t power_profile -p daemon.notice"
20
21# Set a given sysctl node to a value.
22#
23# Variables:
24# $node: sysctl node to set with the new value
25# $value: HIGH for the highest performance value, LOW for the best
26#	  economy value, or the value itself.
27# $highest_value: maximum value for this sysctl, when $value is "HIGH"
28# $lowest_value: minimum value for this sysctl, when $value is "LOW"
29#
30sysctl_set ()
31{
32	# Check if the node exists
33	if [ -z "$(sysctl -n ${node} 2> /dev/null)" ]; then
34		return
35	fi
36
37	# Get the new value, checking for special types HIGH or LOW
38	case ${value} in
39	[Hh][Ii][Gg][Hh])
40		value=${highest_value}
41		;;
42	[Ll][Oo][Ww])
43		value=${lowest_value}
44		;;
45	[Nn][Oo][Nn][Ee])
46		return
47		;;
48	*)
49		;;
50	esac
51
52	# Set the desired value
53	[ -n "${value}" ] && sysctl ${node}=${value}
54}
55
56if [ $# -ne 1 ]; then
57	err 1 "Usage: $0 [0x00|0x01]"
58fi
59load_rc_config $name
60
61# Find the next state (performance or economy).
62state=$1
63case ${state} in
640x01 | '')
65	${LOGGER} "changed to 'performance'"
66	profile="performance"
67	;;
680x00)
69	${LOGGER} "changed to 'economy'"
70	profile="economy"
71	;;
72*)
73	echo "Usage: $0 [0x00|0x01]"
74	exit 1
75esac
76
77# Set the various sysctls based on the profile's values.
78node="hw.acpi.cpu.cx_lowest"
79highest_value="C1"
80lowest_value="`(sysctl -n dev.cpu.0.cx_supported | \
81	awk '{ print "C" split($0, a) }' -) 2> /dev/null`"
82eval value=\$${profile}_cx_lowest
83sysctl_set
84
85node="dev.cpu.0.freq"
86highest_value="`(sysctl -n dev.cpu.0.freq_levels | \
87	awk '{ split($0, a, "[/ ]"); print a[1] }' -) 2> /dev/null`"
88lowest_value="`(sysctl -n dev.cpu.0.freq_levels | \
89	awk '{ split($0, a, "[/ ]"); print a[length(a) - 1] }' -) 2> /dev/null`"
90eval value=\$${profile}_cpu_freq
91sysctl_set
92
93exit 0
94