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