linamh/sys-power/undervolt/files/undervolt.initd

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#!/sbin/runscript
# Copyright 1999-2005 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $
CUSTOM_VTABLE=" "
DEFAULT_VTABLE=" "
VTABLE_PATH=" "
depend()
{
need localmount
need logger
}
do_error()
{
# Display an error
# $1: Error message
eerror $1
eerror "see http://gentoo-wiki.com/HOWTO_Undervolt_a_Pentium_M_CPU for further information"
eend 1
}
sysfs_check()
{
# Check that the sysfs interface exists
if [ -e ${VTABLE_PATH_0_3_X} ]; then
VTABLE_PATH="${VTABLE_PATH_0_3_X}"
CUSTOM_VTABLE="${CUSTOM_VTABLE_0_3_X}"
DEFAULT_VTABLE="${DEFAULT_VTABLE_0_3_X}"
return 0
else
if [ -e ${VTABLE_PATH_0_2_X} ]; then
VTABLE_PATH="${VTABLE_PATH_0_2_X}"
CUSTOM_VTABLE="${CUSTOM_VTABLE_0_2_X}"
DEFAULT_VTABLE="${DEFAULT_VTABLE_0_2_X}"
return 0
else
logger "Undervolt: SysFs table not found. Can't modify CPU voltages."
eerror "SysFs voltage_table not found. Can't modify CPU voltage table."
eerror "It seems that the undervolting patch has not been applied to the kernel"
do_error "or that the file /etc/conf.d/undervolt is not correctly configured."
return 1
fi
fi
}
einfo_tables()
{
# display current table and a custom table
# $1 : custom table to display
# Display the voltage table currently used by the CPU
einfo "Current table: "`cat ${VTABLE_PATH} `
# Display the custom voltage table
einfo "Configured table: ${1}"
}
set_custom_table()
{
# Set a custom table through the sysfs interface
# $1 : custom table to set
# Display current table and custom table that will be set
einfo_tables "${1}"
# Write the custom voltage to the SysFS interface and display the
# new voltage table that is now used by the CPU if there is no error
echo "${1}" > ${VTABLE_PATH} && \
einfo "Applied table: "`cat ${VTABLE_PATH}`
return $?
}
start()
{
ebegin "Changing CPU voltages table"
if [ "$IS_CONFIGURED" = "yes" ]; then
sysfs_check || return 1
set_custom_table "${CUSTOM_VTABLE}"
eend $?
else
do_error "Custom voltage table is not configured. Check the file /etc/conf.d/undervolt"
fi
}
# I think it is not necessary to switch to the default voltage table on shutdown
# But this init script provides that feature in case you don't agree.
stop()
{
if [ "$SWITCH_BACK" = "yes" ]; then
if [ "$IS_CONFIGURED" = "yes" ]; then
ebegin "Switching back to default CPU voltage table"
sysfs_check || return 1
set_custom_table "${DEFAULT_VTABLE}"
eend $?
else
do_error "Default voltage table is not configured. Check the file /etc/conf.d/undervolt"
fi
else
ebegin "Not switching back to default CPU voltage table (disabled in configuration)"
eend 0
fi
}