#!/bin/sh -e
#
#  fan_speed: speed of the cpu or case fan
#  Copyright (C) 2009 Canonical Ltd.
#
#  Authors: Dustin Kirkland <kirkland@canonical.com>

#  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/>.
#

PKG="byobu"
color 2>/dev/null || color() { true; }

DIR="/sys/class/hwmon"

# Nothing interesting to say here about fan speed
[ "$1" = "--detail" ] && exit 0

# Let's check a few different probes for fan speed

# This seems to cover most of them:
for i in $(find $DIR/*/*/ -type f -name "fan1_input"); do
	speed=$(cat "$i")
	if [ "$speed" -gt 0 ]; then
	        printf "$(color bold1)%s$(color -)$(color none)%s$(color -) " "$speed" "rpm"
		exit 0
	fi
done

# But others (e.g. Dell Inspirons) seem to be here:
if [ -r /proc/i8k ]; then
	for speed in $(awk '{ print $7, $8 }' /proc/i8k); do
		if [ "$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
			[ "$speed" -gt 10000 ] && speed=$((${speed} / 30))
			printf "$(color bold1)%s$(color -)$(color none)%s$(color -) " "$speed" "rpm"
			exit 0
		fi
	done
fi
