#!/bin/sh -e
#
# fan_speed: speed of the cpu or case fan
#
# Copyright (C) 2009 Canonical Ltd.
# Copyright (C) 2011-2014 Dustin Kirkland
#
# Authors: Dustin Kirkland <[email protected]>
#
# 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, version 3 of the License.
#
# 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/>.

__fan_speed_detail() {
# Nothing interesting to say here about fan speed
return
}

__fan_speed() {
local i="" speed=0
# Let's check a few different probes for fan speed
# This seems to cover most of them:
for i in $FAN /sys/class/hwmon/*/*/fan1_input /sys/class/hwmon/*/device/hwmon/*/fan1_input; do
[ -f "$i" ] || continue
read speed < "$i"
if [ -n "$speed" ] && [ "$speed" -gt 0 ]; then
color bold1; printf "%s" "$speed"; color -; color none; printf "rpm"; color --
return 0
fi
done

# But others (e.g. Dell Inspirons) seem to be here:
if [ -r /proc/i8k ]; then
local line=""
read line < /proc/i8k
set -- $line
for speed in $7 $8; do
if [ -n "$speed" ] && [ "$speed" -gt 0 ]; then
# I8K_FAN_MULT defaults to 30 (buggy BIOS workaround?),
# use `modprobe i8k fan_mult=1` to disable if unneeded,
# resulting in nonsensical speeds
[ "$speed" -gt 10000 ] && speed=$((${speed} / 30))
color bold1; printf "%s" "$speed"; color -; color none; printf "rpm"; color --
return 0
fi
done
fi
}

# vi: syntax=sh ts=4 noexpandtab