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#!/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
	# 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
}

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