#!/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 <kirkland@byobu.org>
#
#    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
	# OpenBSD: read fan speed from hw.sensors
	if [ "$BYOBU_OSTYPE" = "OpenBSD" ]; then
		speed=$(sysctl hw.sensors 2>/dev/null | awk -F'=' '/fan[0-9]/ { print $2+0; exit }')
		if [ -n "$speed" ] && [ "$speed" -gt 0 ] 2>/dev/null; then
			color bold1; printf "%s" "$speed"; color -; color none; printf "rpm"; color --
			return 0
		fi
		rm -f "$BYOBU_RUN_DIR/status.$BYOBU_BACKEND/fan_speed"*
		return 0
	fi
	# 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" ]; then
			if [ "$speed" -gt 0 ]; then
				color bold1; printf "%s" "$speed"; color -; color none; printf "rpm"; color --
				return 0
			else
				# Fan is at 0 RPM, clear any cached values
				rm -f "$BYOBU_RUN_DIR/status.$BYOBU_BACKEND/fan_speed"*
				return 0
			fi
		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" ]; then
				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))
					color bold1; printf "%s" "$speed"; color -; color none; printf "rpm"; color --
					return 0
				else
					# Fan is at 0 RPM, clear any cached values
					rm -f "$BYOBU_RUN_DIR/status.$BYOBU_BACKEND/fan_speed"*
					return 0
				fi
			fi
		done
	fi
	# No fan found or couldn't read speed, clear cache
	rm -f "$BYOBU_RUN_DIR/status.$BYOBU_BACKEND/fan_speed"*
}

# vi: syntax=sh ts=4 noexpandtab
