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#!/bin/bash
# See https://github.com/Cryolitia/gpd-fan-driver for a documentation of this interface.
# See https://www.kernel.org/doc/Documentation/hwmon/sysfs-interface for documentation of the kernel sysfs interface.
### LICENSING INFORMATION: GPL 2.0 OR LATER
#
# 'gpdfanspeed': Companion application to the kernel driver 'gpd-fan' (https://github.com/Cryolitia/gpd-fan-driver) to make easy command line control of the driver's settings.
# Copyright (C) 2024+ dreieck.
#
#
# 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 2 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, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. Also add information on how to contact you by electronic and paper mail.
#
###
set -e
shopt -s extglob
PROGRAMMENAME="gpdfanspeed"
VERSION=20240429.01
FANMONDIR="$(ls -1d "/sys/devices/platform/gpd_fan/hwmon"/hwmon[0-9] | head -n1)"
DEBUGFSDIR="/sys/kernel/debug/gpdfan"
## In the hwmon interface ($FANMONDIR/):
_namefile="name"
_rpmfile="fan1_input"
_pwmsettingfile="pwm1"
_controlmodefile="pwm1_enable"
_pwmmodefile="pwm1_mode"
_updateintervalfile="update_interval"
## In debugfs ($DEBUGFSDIR/):
_debugpwmsettingfile="pwm_reg"
_debugcontrolmodefile="manual_control_reg"
msg() {
printf '%s\n' "$@"
}
msgnonl() {
printf '%s' "$@"
}
errmsg() {
msg "$@" > /dev/stderr
}
printlicensestub() {
msg "${PROGRAMMENAME} version ${VERSION}, Copyright (C) 2024+ dreieck"
msg "${PROGRAMMENAME} comes with ABSOLUTELY NO WARRANTY. It is licensed under GPL-2.0-or-later."
msg "This is free software, and you are welcome to redistribute it under certain conditions."
msg "For details, see https://www.gnu.org/licenses/old-licenses/gpl-2.0-standalone.html"
}
printusage() {
msg "Usage:"
msg ""
msg " $0"
msg " Show current setting of gpd-fan."
msg ""
msg " $0 <setting>"
msg " Sets GPD fan setting. '<setting>' can be:"
msg " * Number in 0..255: Sets the fan to manual control and that speed (values outside that range will be truncated)."
msg " * 'auto': Sets to automatically controlled by the firmware."
msg " * 'manual': Sets to manually controlled."
msg " * 'max': Sets to full speed."
msg " * [0-9]+ms: Sets the interval in ms in which the chip updates the readings."
msg ""
msg " $0 <-h|--help|help>"
msg " Prints this help message."
msg ""
msg " $0 <-V|--version|version>"
msg " Prints out the programme's version."
}
case "$1" in
"-h"|"--help"|"help")
printlicensestub
msg ""
printusage
exit 0
;;
"-V"|"--version"|"version")
msg "${VERSION}"
exit 0
;;
esac
_action=show
if [ "$#" -ge 1 ]; then
_action=set
_setting="$1"
fi
case "${_action}" in
'show')
_name="$(<"${FANMONDIR}/${_namefile}")"
_rpm="$(<"${FANMONDIR}/${_rpmfile}")"
_controlmode="$(<"${FANMONDIR}/${_controlmodefile}")"
_setting="$(<"${FANMONDIR}/${_pwmsettingfile}")"
_pwmmode="$(<"${FANMONDIR}/${_pwmmodefile}")"
_updateinterval="$(<"${FANMONDIR}/${_updateintervalfile}")"
if [ -r "${DEBUGFSDIR}/${_debugpwmsettingfile}" ]; then
_pwm_reg="$(<"${DEBUGFSDIR}/${_debugpwmsettingfile}")"
fi
if [ -r "${DEBUGFSDIR}/${_debugcontrolmodefile}" ]; then
_manual_control_reg="$(<"${DEBUGFSDIR}/${_debugcontrolmodefile}")"
fi
case "${_controlmode}" in
"0")
_controlmodename="full speed"
;;
"1")
_controlmodename="manual"
;;
"2")
_controlmodename="auto"
;;
*)
_controlmodename="unknown (${_controlmode})"
;;
esac
case "${_pwmmode}" in
"0")
_pwmmodename="DC"
;;
"1")
_pwmmodename="PWM"
;;
*)
_pwmmodename="unknown (${_pwmmode})"
;;
esac
msg "${_name}:"
msgnonl " Speed: ${_rpm} rpm"
if [ -n "${_pwm_reg}" ]; then
msgnonl " (HW register: ${_pwm_reg})"
fi
msg ""
msgnonl " Control mode: ${_controlmodename}"
if [ -n "${_manual_control_reg}" ]; then
msgnonl " (HW register: ${_manual_control_reg})"
fi
msg ""
msg " Speed setting (0..255): ${_setting}"
msg " PWM Mode: ${_pwmmodename}"
msg " Info update interval: ${_updateinterval} ms"
;;
'set')
case "${_setting}" in
?(-)+([0-9]))
if [ "${_setting}" -lt 0 ]; then
_setting=0
fi
if [ "${_setting}" -gt 255 ]; then
_setting=255
fi
printf '1' > "${FANMONDIR}/${_controlmodefile}"
printf '%s' "${_setting}" > "${FANMONDIR}/${_pwmsettingfile}"
;;
'auto')
printf '%s' '2' > "${FANMONDIR}/${_controlmodefile}"
;;
'manual')
printf '%s' '1' > "${FANMONDIR}/${_controlmodefile}"
;;
'max')
printf '%s' '0' > "${FANMONDIR}/${_controlmodefile}"
;;
+([0-9])ms)
_value="${_setting%ms}"
printf '%s' "${_value}" > "${FANMONDIR}/${_updateintervalfile}"
;;
*)
errmsg "$0: Invalid setting '${_setting}'".
errmsg ""
errmsg "$(printusage)"
errmsg ""
errmsg "Aborting."
exit 1
;;
esac
;;
*)
errmsg "$0: Internal error: This state should never bee reached."
errmsg "This is a bug in $0, please report."
errmsg "Reference: This message is at line number ${LINENO}."
errmsg "Aborting."
exit 255
;;
esac
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