#!/bin/bash

# cpufreqctl - This script can configure the pstate driver of your intel CPU.
#
# Copyright (C) 2015-2020
#     Martin Koppehel <psl.kontakt@gmail.com>,
#     Fin Christensen <christensen.fin@gmail.com>,
#
# This file is part of the gnome-shell extension cpupower.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

set -e

VERSION="9.0.1"

log ()
{
    echo "$@" >&2 || true
}

show_usage ()
{
    log "usage: cpufreqctl [-h] [turbo {get,0,1}] [min {get,check,VALUE}] [max {get,VALUE}]"
    log "version $VERSION"
}

show_help ()
{
    log "usage: cpufreqctl [-h] ACTION PARAMETER"
    log
    log "This script can configure the pstate driver of your intel CPU."
    log
    help_arguments
    help_actions
    help_turbo
    help_min
    help_max
    help_examples
    help_copyright
}

help_arguments ()
{
    log "optional arguments:"
    log "    -h, --help   show this help message and exit"
    log
}

help_actions ()
{
    log "available actions:"
    log "    turbo        control or read the turbo boost state of your cpu"
    log "    min          get or set the minimum cpu frequency (in %, [0;100])"
    log "                 or get the smallest allowed value"
    log "    max          get or set the maximum cpu frequency (in %, [0;100])"
    log
}

help_turbo ()
{
    log "turbo parameters:"
    log "    get          get the current turbo boost state"
    log "    0            turn turbo boost off"
    log "    1            turn turbo boost on"
    log
}

help_min ()
{
    log "min parameters:"
    log "    get          get the current set minimum frequency (in %, [0;100])"
    log "    check        get the smallest allowed minimum frequency for your cpu model"
    log "    VALUE        set the current minimum frequency to a value in [0;100]"
    log "                 the values is automatically clamped to the minimum allowed cpu"
    log "                 frequency"
    log
}

help_max ()
{
    log "max parameters:"
    log "    get          get the current set maximum frequency (in %, [0;100])"
    log "    VALUE        set the current maximum frequency to a value in [0;100]"
    log
}

help_examples ()
{
    log "examples:"
    log "    Set the maximum frequency to 50%"
    log "        cpufreqctl max 50"
    log
    log "    Get the turbo boost state"
    log "        cpufreqctl turbo get"
    log
    log "    Get smallest allowed minimum cpu frequency for your model"
    log "        cpufreqctl min check"
    log
}

help_copyright ()
{
    log "cpufreqctl $VERSION  Copyright (c) 2020  Martin Koppehel, Fin Christensen"
}

if [ $# -lt 1 ]
then
    show_usage
    log "error: you must specify an action!"
    exit
fi

if [ "$1" = "-h" ] || [ "$1" = "--help" ]
then
    show_help
    exit
fi

if [ "$1" = "turbo" ]
then
    if [ -z "$2" ]
    then
        log "usage: cpufreqctl turbo {get,0,1}"
        log
        help_turbo
        help_copyright
        exit
    fi

    if [ "$2" = "get" ]
    then
        value=$(<"/sys/devices/system/cpu/intel_pstate/no_turbo")
        if [ "${value}" -eq 0 ]
        then
            echo 1
        else
            echo 0
        fi
        exit
    fi
    if [ "$2" -lt 0 ] || [ "$2" -gt 1 ];
    then
        log "usage: cpufreqctl turbo {get,0,1}"
        log "error: VALUE must be 0 or 1"
        exit
    fi

    if [ "$2" -eq 1 ]
    then
        echo 0 > /sys/devices/system/cpu/intel_pstate/no_turbo
    else
        echo 1 > /sys/devices/system/cpu/intel_pstate/no_turbo
    fi
    exit
fi

if [ "$1" = "max" ]
then
    if [ -z "$2" ]
    then
        log "usage: cpufreqctl max {get,VALUE}"
        log
        help_max
        help_copyright
        exit
    fi

    if [ "$2" = "get" ]
    then
        value=$(</sys/devices/system/cpu/intel_pstate/max_perf_pct)
        echo "${value}"
        exit
    fi

    if [ "$2" = "check" ]
    then
        preValue=$(</sys/devices/system/cpu/intel_pstate/max_perf_pct)
        echo 100 > /sys/devices/system/cpu/intel_pstate/max_perf_pct
        postValue=$(</sys/devices/system/cpu/intel_pstate/max_perf_pct)
        echo "${preValue}" > /sys/devices/system/cpu/intel_pstate/max_perf_pct
        echo "${postValue}"
        exit
    fi

    if [ "$2" -lt 0 ] || [ "$2" -gt 100 ];
    then
        log "usage: cpufreqctl max {get,VALUE}"
        log "error: VALUE must be between 0 and 100"
        exit
    fi
    echo "$2" > /sys/devices/system/cpu/intel_pstate/max_perf_pct
    exit
fi

if [ "$1" = "min" ]
then
    if [ -z "$2" ]
    then
        log "usage: cpufreqctl mini {get,check,VALUE}"
        log
        help_min
        help_copyright
        exit
    fi

    if [ "$2" = "get" ]
    then
        value=$(</sys/devices/system/cpu/intel_pstate/min_perf_pct)
        echo "${value}"
        exit
    fi
    if [ "$2" = "check" ]
    then
        preValue=$(</sys/devices/system/cpu/intel_pstate/min_perf_pct)
        echo 0 > /sys/devices/system/cpu/intel_pstate/min_perf_pct
        postValue=$(</sys/devices/system/cpu/intel_pstate/min_perf_pct)
        echo "${preValue}" > /sys/devices/system/cpu/intel_pstate/min_perf_pct
        echo "${postValue}"
        exit
    fi
    if [ "$2" -lt 0 ] || [ "$2" -gt 100 ];
    then
        log "usage: cpufreqctl min {get,check,VALUE}"
        log "error: VALUE must be between 0 and 100"
        exit
    fi
    echo "$2" > /sys/devices/system/cpu/intel_pstate/min_perf_pct
    exit
fi

show_usage
log "error: unknown action $*"
exit 1