This file is indexed.

/usr/sbin/pwmconfig is in fancontrol 1:3.3.2-2+deb7u1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
#!/bin/bash
#
# pwmconfig
# Tests the pwm outputs of sensors and configures fancontrol
# Supported Linux kernel versions: 2.6.5 and later
#
#    Warning!!! This program will stop your fans, one at a time,
#    for approximately 5 seconds each!!!
#    This may cause your processor temperature to rise!!!
#    Verify that all fans are running at normal speed after this
#    program has exited!!!
#
#    Copyright (C) 2007-2009 Jean Delvare <khali@linux-fr.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; 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.
#
#

REVISION=$(echo '$Revision: 5857 $' | cut -d' ' -f2)
REVDATE=$(echo '$Date: 2010-08-22 18:17:57 +0200 (dim. 22 août 2010) $' | cut -d' ' -f2)
PIDFILE="/var/run/fancontrol.pid"

if [ -f "$PIDFILE" ]
then
	echo "File $PIDFILE exists. This typically means that the"
	echo "fancontrol deamon is running. You should stop it before running pwmconfig."
	echo "If you are certain that fancontrol is not running, then you can delete"
	echo "$PIDFILE manually."
	exit 1
fi

if [ "`id -u`" != "0" ]
then
	echo "You need to be root to run this script."
	exit 1
fi

echo "# pwmconfig revision $REVISION ($REVDATE)"
echo 'This program will search your sensors for pulse width modulation (pwm)'
echo 'controls, and test each one to see if it controls a fan on'
echo 'your motherboard. Note that many motherboards do not have pwm'
echo 'circuitry installed, even if your sensor chip supports pwm.'
echo
echo 'We will attempt to briefly stop each fan using the pwm controls.'
echo 'The program will attempt to restore each fan to full speed'
echo 'after testing. However, it is ** very important ** that you'
echo 'physically verify that the fans have been to full speed'
echo 'after the program has completed.'
echo

DELAY=5 # 3 seconds delay is too short for large fans, thus I increased it to 5
MAX=255

if [ -d "/sys/class/hwmon" ]
then
	SYSFS=2
	DIR="/sys/class/hwmon"
	PREFIX='hwmon*'
elif [ -d "/sys/bus/i2c/devices" ]
then
	SYSFS=1
	DIR="/sys/bus/i2c/devices"
	PREFIX='*-*'
else
	echo $0: 'No sensors found! (modprobe sensor modules?)'
	exit 1
fi

cd $DIR
DEVICES=`echo $PREFIX`
if [ "$PREFIX" = "$DEVICES" ]
then
	echo $0: 'No sensors found! (modprobe sensor modules?)'
	exit 1
fi

# We may need to adjust the device path
if [ "$SYSFS" = "2" ]
then
	OLD_DEVICES="$DEVICES"
	DEVICES=""

	for device in $OLD_DEVICES
	do
		if [ ! -r "$device/name" ]
		then
			device="$device/device"
		fi
		
		DEVICES="$DEVICES $device"
	done
fi


for device in $DEVICES
do
	# Find available fan control outputs
	MATCH=$device/'pwm[1-9]'
	device_pwm=`echo $MATCH`
	if [ "$SYSFS" = "1" -a "$MATCH" = "$device_pwm" ]
	then
		# Deprecated naming scheme (used in kernels 2.6.5 to 2.6.9)
		MATCH=$device/'fan[1-9]_pwm'
		device_pwm=`echo $MATCH`
	fi
	if [ "$MATCH" != "$device_pwm" ]
	then
		PWM="$PWM $device_pwm"
	fi

	# Find available fan monitoring inputs
	MATCH=$device/'fan[1-9]_input'
	device_fan=`echo $MATCH`
	if [ "$MATCH" != "$device_fan" ]
	then
		FAN="$FAN $device_fan"
	fi
done

if [ -z "$PWM" ]
then
	echo $0: 'There are no pwm-capable sensor modules installed'
	exit 1
fi
if [ -z "$FAN" ]
then
	echo $0: 'There are no fan-capable sensor modules installed'
	exit 1
fi

# $1 = padding
function print_devices()
{
	local name

	for device in $DEVICES
	do
		name=`cat $device/name 2> /dev/null`
		[ -z "$name" ] && name="unknown (no name attribute)"
		echo "$1$device is $name"
	done
}

# $1 = pwm file name
function is_pwm_auto()
{
	ENABLE=${1}_enable
	if [ -f $ENABLE ]
	then
		if [ "`cat $ENABLE`" -gt 1 ]
		then
			return 0
		fi
	fi

	return 1
}

# $1 = pwm file name
function pwmdisable()
{
	ENABLE=${1}_enable
	# No enable file? Just set to max
	if [ ! -f $ENABLE ]
	then
		echo $MAX > $1
		return 0
	fi

	# Try pwmN_enable=0
	echo 0 2>/dev/null > $ENABLE
	if [ "`cat $ENABLE`" -eq 0 ]
	then
		# Success
		return 0
	fi

	# It didn't work, try pwmN_enable=1 pwmN=255
	echo 1 2>/dev/null > $ENABLE
	if [ "`cat $ENABLE`" -ne 1 ]
	then
		echo "$ENABLE stuck to `cat $ENABLE`" >&2
		return 1
	fi

	echo $MAX > $1
	if [ "`cat $1`" -ge 190 ]
	then
		# Success
		return 0
	fi

	# Nothing worked
	echo "$1 stuck to `cat $1`" >&2
	return 1
}

# $1 = pwm file name
function pwmenable()
{
	ENABLE=${1}_enable
	if [ -w $ENABLE ]
	then
		echo 1 2>/dev/null > $ENABLE
		if [ $? -ne 0 ]
		then
			return 1
		fi
	fi
	echo $MAX > $1
}

# $1 = pwm file name; $2 = pwm value 0-255
function pwmset()
{
	echo $2 > $1
}

echo 'Found the following devices:'
print_devices "   "
echo

echo 'Found the following PWM controls:'
for i in $PWM
do
	echo "   $i"
	if [ -w $i ]
	then
		# First check if PWM output is in automatic mode
		if is_pwm_auto $i
		then
			echo "$i is currently setup for automatic speed control."
			echo 'In general, automatic mode is preferred over manual mode, as'
			echo 'it is more efficient and it reacts faster. Are you sure that'
			echo -n 'you want to setup this output for manual control? (n) '
			read X
			if [ "$X" = "" -o "$X" != "y" -a "$X" != "Y" ]
			then
				continue
			fi
		fi

		pwmdisable $i
		if [ $? -ne 0 ]
		then
			echo "Manual control mode not supported, skipping $i."
		elif [ "$GOODPWM" = "" ]
		then
			GOODPWM=$i
		else
			GOODPWM="$GOODPWM $i"
		fi
	else
		echo "Can't write to $i, skipping."
	fi
done

if [ "$GOODPWM" = "" ]
then
	echo 'There are no usable PWM outputs.'
	exit 1
fi

echo
echo "Giving the fans some time to reach full speed..."
sleep $DELAY
echo 'Found the following fan sensors:'
for i in $FAN
do
	S=`cat $i`
	if [ "$S" = "0" -o "$S" = "-1" ]
	then
		echo "   $i     current speed: 0 ... skipping!"
	else
		echo "   $i     current speed: $S RPM"
		if [ "$GOODFAN" = "" ]
		then
			GOODFAN=$i
			SPEEDS=$S
		else
			GOODFAN="$GOODFAN $i"
			SPEEDS="$SPEEDS $S"
		fi
	fi
done
echo

if [ "$GOODFAN" = "" ]
then
	echo 'There are no working fan sensors, all readings are 0.'
	echo 'Make sure you have a 3-wire fan connected.'
	echo 'You may also need to increase the fan divisors.'
	echo 'See doc/fan-divisors for more information.'
	exit 1
fi

echo 'Warning!!! This program will stop your fans, one at a time,'
echo "for approximately $DELAY seconds each!!!"
echo 'This may cause your processor temperature to rise!!!'
echo 'If you do not want to do this hit control-C now!!!'
echo -n 'Hit return to continue: '
read X
echo

PLOTTER=gnuplot
STEP=15
PDELAY=2
# Use a smaller step for low PWM values as this is typically where the
# more important fan speed changes are happening.
STEP2=2
STEP2_BELOW=31

function pwmdetail()
{
	P=$1
	F=$2
	PLOT=

	type $PLOTTER > /dev/null 2>&1
	if [ $? -eq 0 ]
	then
		echo -n "Would you like to generate a graphical plot using $PLOTTER (y)? "
		read X
		if [ "$X" = "y" -o "$X" = "Y" -o "$X" = "" ]
		then
			PLOT=y
		fi
	else
		if [ -n "$DISPLAY" ]
		then
			echo "Note: If you had $PLOTTER installed, I could generate a graphical plot."
		fi
	fi

	if [ "$PLOT" = "y" ]
	then
		TMP1=`mktemp -t pwmtest1.XXXXXXXXXX` || { echo "$0: Cannot create temporary file" >&2; exit 1; }
		TMP2=`mktemp -t pwmtest2.XXXXXXXXXX` || { rm -f $TMP1 ; echo "$0: Cannot create temporary file" >&2; exit 1; }
		echo "set xlabel \"PWM: $P\"" > $TMP1
		echo "set ylabel \"FAN: $F (RPM)\"" >> $TMP1
		echo 'set nokey' >> $TMP1
		echo 'set xrange [0:255]' >> $TMP1
		echo "plot \"$TMP2\" with lines" >> $TMP1
		echo 'pause -1 "    Hit return to continue..."' >> $TMP1
		> $TMP2
	fi

	local threshold=100000
	let pwm=$MAX
	pwmenable $P
	while [ $pwm -ge 0 ]
	do
		pwmset $P $pwm
		sleep $PDELAY
		if [ $? -ne 0 ]
		then
			pwmdisable $P
			echo '^C received, aborting...'
			rm -f $TMP1 $TMP2
			exit 1
		fi
		S=`cat $F`
		# Fan speed should never increase significantly
		if [ $S -gt $threshold ]
		then
			echo "    PWM $pwm FAN $S (probably incorrect)"
		else
			echo "    PWM $pwm FAN $S"
			let threshold=S*6/5
		fi

		if [ "$PLOT" = "y" ]
		then
			echo "$pwm $S" >> $TMP2
		fi
		if [ "$S" = "0" -o "$S" = "-1" ]
		then
			pwmdisable $P
			echo "    Fan Stopped at PWM = $pwm"
			if [ $pwm -eq $MAX ]
			then
				echo "    This fan appears to stop when the PWM is enabled;"
				echo "    perhaps the fan input shares a pin with the PWM output"
				echo "    on the sensor chip."
				echo "    You cannot control this fan with this PWM output."
				rm -f $TMP1 $TMP2
				echo
				return 0
			fi
			break
		fi
		if [ $pwm -lt $STEP2_BELOW ]
		then
			let pwm=$pwm-$STEP2
		else
			let pwm=$pwm-$STEP
		fi
	done
	pwmdisable $P
	if [ "$PLOT" = "y" ]
	then
		$PLOTTER  $TMP1
		rm -f $TMP1 $TMP2
	fi
	echo
}

for i in $GOODPWM
do
	echo Testing pwm control $i ...
	pwmenable $i
	if [ $? -ne 0 ]
	then
		echo "Manual control mode not supported, skipping."
		continue
	fi
	pwmset $i 0
	sleep $DELAY
	if [ $? -ne 0 ]
	then
		pwmdisable $i
		echo '^C received, restoring PWM and aborting...'
		exit 1
	fi

	# Sample all current fan speeds at once, so that we can quickly
	# disable PWM and return all fans to full speed
	CURRENT_SPEEDS="`cat $GOODFAN`"
	pwmdisable $i

	let pwmactivecount=0
	let count=1
	for j in $GOODFAN
	do
		OS=`echo $SPEEDS | cut -d' ' -f$count`
		S=`echo $CURRENT_SPEEDS | cut -d' ' -f$count`
		echo "  $j ... speed was $OS now $S"
		let threshold=2*$OS/3
		if [ $S -lt $threshold ]
		then
			echo "    It appears that fan $j"
			echo "    is controlled by pwm $i"
#
# a PWM can control more than one fan....
#
			if [ $pwmactivecount -eq 0 ]
			then
				let pwmactivecount=1
				pwmactive="$i ${pwmactive}"
				fanactive="$j ${fanactive}"
				fanactive_min="$S ${fanactive_min}"

				# Give all correlated fans time to return to full speed
				sleep $DELAY
				if [ $? -ne 0 ]
				then
					echo '^C received, aborting...'
					exit 1
				fi
			else
				fanactive="$(($j+${fanactive}))" #not supported yet by fancontrol
				fanactive_min="$(($S+${fanactive_min}))"
			fi
			S=`cat $j`
			if [ $S -lt $threshold ]
			then
				echo "    Fan $j has not returned to speed, please investigate!"
			else
				echo -n "Would you like to generate a detailed correlation (y)? "
				read X
				if [ "$X" = "y" -o "$X" = "Y" -o "$X" = "" ]
				then
					pwmdetail $i $j
				fi
			fi
		else
			echo "    no correlation"
		fi
		let count=count+1
	done
	echo
	if [ "$pwmactivecount" = "0" ]
	then
		echo "No correlations were detected."
		echo "There is either no fan connected to the output of $i,"
		echo "or the connected fan has no rpm-signal connected to one of"
		echo "the tested fan sensors. (Note: not all motherboards have"
		echo "the pwm outputs connected to the fan connectors,"
		echo "check out the hardware database on http://www.almico.com/forumindex.php)"
		echo
		echo -n "Did you see/hear a fan stopping during the above test (n)? "
		read X
		if [ "$X" = "y" -o "$X" = "Y" ]
		then
			pwmactive="$i ${pwmactive}"
		fi
		echo
	fi
done


echo 'Testing is complete.'
echo 'Please verify that all fans have returned to their normal speed.'
echo
echo 'The fancontrol script can automatically respond to temperature changes'
echo 'of your system by changing fanspeeds.'
echo -n 'Do you want to set up its configuration file now (y)? '

read X
if [ "$X" = "n" -o "$X" = "N" ]
then
	exit
fi

for device in $DEVICES
do
	# Find available temperature monitoring inputs
	MATCH=$device/'temp[1-9]_input'
	device_temp=`echo $MATCH`
	if [ "$MATCH" != "$device_temp" ]
	then
		TEMPS="$TEMPS $device_temp"
	fi
done

if [ -z "$TEMPS" ]
then
	echo $0: 'There are no temperature-capable sensor modules installed'
	exit 1
fi

function DevicePath()
{
	if [ -h "$1/device" ]
	then
		readlink -f "$1/device" | sed -e 's/^\/sys\///'
	fi
}

function DeviceName()
{
	if [ -r "$1/name" ]
	then
		cat "$1/name" | sed -e 's/[[:space:]=]/_/g'
	elif [ -r "$1/device/name" ]
	then
		cat "$1/device/name" | sed -e 's/[[:space:]=]/_/g'
	fi
}

function ValidateDevices()
{
	local OLD_DEVPATH="$1" OLD_DEVNAME="$2" outdated=0
	local entry device name path

	for entry in $OLD_DEVPATH
	do
		device=`echo "$entry" | sed -e 's/=[^=]*$//'`
		path=`echo "$entry" | sed -e 's/^[^=]*=//'`

		if [ "`DevicePath "$device"`" != "$path" ]
		then
			echo "Device path of $device has changed"
			outdated=1
		fi
	done

	for entry in $OLD_DEVNAME
	do
		device=`echo "$entry" | sed -e 's/=[^=]*$//'`
		name=`echo "$entry" | sed -e 's/^[^=]*=//'`

		if [ "`DeviceName "$device"`" != "$name" ]
		then
			echo "Device name of $device has changed"
			outdated=1
		fi
	done

	return $outdated
}

function AskPath()
{
	echo -n 'What should be the path to your fancontrol config file (/etc/fancontrol)? '

	read FCCONFIG
	if [ "$FCCONFIG" = "" ]
	then
		FCCONFIG="/etc/fancontrol"
	fi
}

AskPath

function ClearConfig()
{
	FCTEMPS=""
	FCFANS=""
	MINTEMP=""
	MAXTEMP=""
	MINSTART=""
	MINSTOP=""
	MINPWM=""
	MAXPWM=""
}

function LoadConfig()
{
	local OLD_DEVPATH OLD_DEVNAME

	# Nothing to do
	if [ ! -f "$1" ]
	then
		ClearConfig
		return 0
	fi

	echo "Loading configuration from $1 ..."
	INTERVAL=`egrep '^INTERVAL=.*$' $1 | sed -e 's/INTERVAL= *//g'`
	OLD_DEVPATH=`egrep '^DEVPATH=.*$' $1 | sed -e 's/DEVPATH= *//g'`
	OLD_DEVNAME=`egrep '^DEVNAME=.*$' $1 | sed -e 's/DEVNAME= *//g'`
	FCTEMPS=`egrep '^FCTEMPS=.*$' $1 | sed -e 's/FCTEMPS= *//g'`
	FCFANS=`egrep '^FCFANS=.*$' $1 | sed -e 's/FCFANS= *//g'`
	MINTEMP=`egrep '^MINTEMP=.*$' $1 | sed -e 's/MINTEMP= *//g'`
	MAXTEMP=`egrep '^MAXTEMP=.*$' $1 | sed -e 's/MAXTEMP= *//g'`
	MINSTART=`egrep '^MINSTART=.*$' $1 | sed -e 's/MINSTART= *//g'`
	MINSTOP=`egrep '^MINSTOP=.*$' $1 | sed -e 's/MINSTOP= *//g'`
	MINPWM=`egrep '^MINPWM=.*$' $1 | sed -e 's/MINPWM= *//g'`
	MAXPWM=`egrep '^MAXPWM=.*$' $1 | sed -e 's/MAXPWM= *//g'`

	# Check for configuration change
	if ! ValidateDevices "$OLD_DEVPATH" "$OLD_DEVNAME"
	then
		echo "Configuration appears to be outdated, discarded"
		ClearConfig
		return 0
	fi
}

LoadConfig $FCCONFIG

# $1 = pwm value below which the fan is stopped
function TestMinStart()
{
	echo
	echo 'Now we increase the PWM value in 10-unit-steps.'
	echo 'Let the fan stop completely, then press return until the'
	echo "fan starts spinning. Then enter 'y'."
	echo 'We will use this value +20 as the starting speed.'
	let fanok=0
	let fanval="$1"

	pwmenable $pwms
	until [ "$fanok" = "1" ]
	do
		if [ $fanval -gt 240 ] ; then let fanval=$MAX ; let fanok=1 ; fi
		echo -n "Setting $pwms to $fanval..."
		pwmset $pwms $fanval
		read FANTEST
		if [ "$FANTEST" != "" ] ; then let fanok=1 ; fi
		let fanval=fanval+10
	done
	pwmdisable $pwms

	let fanval=fanval+20
	if [ $fanval -gt 240 ] ; then let fanval=$MAX ; fi
	echo "OK, using $fanval"
}

# $1 = fan input to read the fan speed from
function TestMinStop()
{
	local faninput=$1
	local threshold=100000
	local fanspeed

	echo
	echo 'Now we decrease the PWM value to figure out the lowest usable value.'
	echo 'We will use a slightly greater value as the minimum speed.'
	let fanval=$MAX

	pwmenable $pwms
	while [ $fanval -ge 0 ]
	do
		pwmset $pwms $fanval
		sleep $PDELAY
		fanspeed=`cat $faninput`
		if [ $fanspeed -gt $threshold ]
		then
			echo "    PWM $fanval -> $fanspeed RPM (probably incorrect)"
			break
		else
			echo "    PWM $fanval -> $fanspeed RPM"
			if [ $fanspeed = "0" -o $fanspeed = "-1" ]
			then
				break
			fi
			let threshold=fanspeed*6/5
		fi
		if [ $fanval -lt $STEP2_BELOW ]
		then
			let fanval=$fanval-$STEP2
		else
			let fanval=$fanval-$STEP
		fi
	done
	pwmdisable $pwms

	if [ $fanval -lt $STEP2_BELOW ]
	then
		let 'fanval=fanval+2*STEP2'
	else
		let 'fanval=fanval+STEP'
	fi
	echo "OK, using $fanval"
}

# Remember the path and name of each device with at least one
# reference (pwm, temp or fan) in the configuration file.
# This function sets globals DEVPATH and DEVNAME as a side effect.
function RememberDevices()
{
	local used entry device name path tempfandev pwmdev
	DEVPATH=""
	DEVNAME=""

	for device in $DEVICES
	do
		device=`echo "$device" | sed -e 's/\/.*$//'`

		used=0
		for entry in $1 $2
		do
			pwmdev=`echo "$entry" | sed -e 's/\/.*$//'`
			tempfandev=`echo "$entry" | sed -e 's/^[^=]*=//' -e 's/\/.*$//'`

			if [ "$device" = "$pwmdev" -o "$device" = "$tempfandev" ]
			then
				used=1
			fi
		done
		if [ "$used" -eq 0 ]
		then
			continue
		fi

		# Record the device path and name. This lets the fancontrol
		# script check that they didn't change. If they did, then the
		# configuration file can no longer be trusted.
		path=`DevicePath "$device"`
		if [ -z "$DEVPATH" ]
		then
			DEVPATH="$device=$path"
		else
			DEVPATH="$DEVPATH $device=$path"
		fi

		name=`DeviceName "$device"`
		if [ -z "$DEVNAME" ]
		then
			DEVNAME="$device=$name"
		else
			DEVNAME="$DEVNAME $device=$name"
		fi
	done
}

function SaveConfig()
{
	RememberDevices "$FCTEMPS" "$FCFANS"

	echo
	echo "Saving configuration to $FCCONFIG..."
	tmpfile=`mktemp -t pwmcfg.XXXXXXXXXX` || { echo "$0: Cannot create temporary file" >&2; exit 1;  }
	trap " [ -f \"$tmpfile\" ] && /bin/rm -f -- \"$tmpfile\"" 0 1 2 3 13 15
	echo "# Configuration file generated by pwmconfig, changes will be lost" >$tmpfile
	echo "INTERVAL=$INTERVAL" >>$tmpfile
	echo "DEVPATH=$DEVPATH" >>$tmpfile
	echo "DEVNAME=$DEVNAME" >>$tmpfile
	echo "FCTEMPS=$FCTEMPS" >>$tmpfile
	echo "FCFANS=$FCFANS" >>$tmpfile
	echo "MINTEMP=$MINTEMP" >>$tmpfile
	echo "MAXTEMP=$MAXTEMP" >>$tmpfile
	echo "MINSTART=$MINSTART" >>$tmpfile
	echo "MINSTOP=$MINSTOP" >>$tmpfile
	[ -n "$MINPWM" ] && echo "MINPWM=$MINPWM" >>$tmpfile
	[ -n "$MAXPWM" ] && echo "MAXPWM=$MAXPWM" >>$tmpfile
	mv $tmpfile $FCCONFIG
	chmod +r $FCCONFIG
	#check if file was written correctly
	echo 'Configuration saved'
}

INTERVAL=10
PS3='select (1-n): '
DEFMINTEMP=20
DEFMAXTEMP=60
DEFMINSTART=150
DEFMINSTOP=100

function filter_cfgvar()
{
	echo "$1" | sed -e 's/ /\n/g' \
		  | egrep "$2" \
		  | sed -e 's/.*=//g'
}

# "select" won't repeat the list of options, so we enclose it in a
# never-ending loop so that it starts over again with each iteration.
# I admit it's not exactly nice, but I do not have a better idea to
# keep usability at an acceptable level.
while [ 1 ] ; do
echo
echo 'Select fan output to configure, or other action:'
select pwms in $pwmactive "Change INTERVAL" "Just quit" "Save and quit" "Show configuration"; do
	case $pwms in
	"Change INTERVAL")
		echo
		echo "Current interval is $INTERVAL seconds."
		echo -n "Enter the interval at which fancontrol should update PWM values (in s): "
		read INTERVAL #check user input here
		break ;;
	"Just quit")
		exit ;;
	"Save and quit")
		SaveConfig
		exit ;;
	"Show configuration")
		echo
		echo "Common Settings:"
		echo "INTERVAL=$INTERVAL"
		for pwmo in $pwmactive
		do
			echo
			echo "Settings of ${pwmo}:"
			echo "  Depends on `filter_cfgvar "$FCTEMPS" "$pwmo"`"
			echo "  Controls `filter_cfgvar "$FCFANS" "$pwmo"`"
			echo "  MINTEMP=`filter_cfgvar "$MINTEMP" $pwmo`"
			echo "  MAXTEMP=`filter_cfgvar "$MAXTEMP" "$pwmo"`"
			echo "  MINSTART=`filter_cfgvar "$MINSTART" "$pwmo"`"
			echo "  MINSTOP=`filter_cfgvar "$MINSTOP" "$pwmo"`"
			XMINP=`filter_cfgvar "$MINPWM" "$pwmo"`
			[ -n "$XMINP" ] && echo "  MINPWM=$XMINP"
			XMAXP=`filter_cfgvar "$MAXPWM" "$pwmo"`
			[ -n "$XMAXP" ] && echo "  MAXPWM=$XMAXP"
		done
		echo
		break ;;

	"`echo ${pwmactive} |sed -e 's/ /\n/g' | egrep "${pwms}"`" )
		pwmsed=`echo ${pwms} | sed -e 's/\//\\\\\//g'` #escape / for sed
		echo

		echo 'Devices:'
		print_devices ""
		echo

		echo 'Current temperature readings are as follows:'
		for j in $TEMPS
		do
			S=`cat $j`
			let S="$S / 1000"
			echo "$j	$S"
		done
		FAN=`echo $fanactive|cut -d' ' -f$REPLY`
		FAN_MIN=`echo $fanactive_min|cut -d' ' -f$REPLY`
	       	FCFANS="`echo $FCFANS | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=$FAN"
		echo
		echo "Select a temperature sensor as source for ${pwms}:"
		select tempss in $TEMPS "None (Do not affect this PWM output)"; do
			if [ "$tempss" = "None (Do not affect this PWM output)" ]
			then

				break;
			else
				if [ "$FCTEMPS" = "" ]
				then
					FCTEMPS="${pwms}=${tempss}"
				else
					FCTEMPS="`echo $FCTEMPS | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=${tempss}"
				fi
			fi
			echo
			echo 'Enter the low temperature (degree C)'
			echo -n "below which the fan should spin at minimum speed ($DEFMINTEMP): "
			read XMT
			if [ "$XMT" = "" ]
			then
				XMT=$DEFMINTEMP
			fi
			if [ "$MINTEMP" = "" ]
			then
				MINTEMP="${pwms}=${XMT}"
			else
				MINTEMP="`echo $MINTEMP | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=${XMT}"
			fi
			echo
			echo 'Enter the high temperature (degree C)'
			echo -n "over which the fan should spin at maximum speed ($DEFMAXTEMP): "
			read XMT
			if [ "$XMT" = "" ]
			then
				XMT=$DEFMAXTEMP
			fi
			if [ "$MAXTEMP" = "" ]
			then
				MAXTEMP="${pwms}=${XMT}"
			else
				MAXTEMP="`echo $MAXTEMP | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=${XMT}"
			fi

			if [ $FAN_MIN -eq 0 ]
			then
				echo
				echo "Enter the minimum PWM value (0-$MAX)"
				echo -n "at which the fan STOPS spinning (press t to test) ($DEFMINSTOP): "
				read XMSTOP

				if [ "$XMSTOP" = "" ]
				then
					XMSTOP=$DEFMINSTOP
				fi
				if [ "$XMSTOP" = "t" -o "$XMSTOP" = "T" ]
				then
					TestMinStop $FAN
					XMSTOP=$fanval
				fi
			else
				XMSTOP=0
			fi
			if [ "$MINSTOP" = "" ]
			then
				MINSTOP="${pwms}=${XMSTOP}"
			else
				MINSTOP="`echo $MINSTOP | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=${XMSTOP}"
			fi

			if [ $FAN_MIN -eq 0 ]
			then
				echo
				echo "Enter the minimum PWM value ($XMSTOP-$MAX)"
				echo -n "at which the fan STARTS spinning (press t to test) ($DEFMINSTART): "
				read XMSTART

				if [ "$XMSTART" = "" ]
				then
					XMSTART=$DEFMINSTART
				fi
				if [ "$XMSTART" = "t" -o "$XMSTART" = "T" ]
				then
					TestMinStart $XMSTOP
					XMSTART=$fanval
				fi
			else
				XMSTART=$DEFMINSTART
			fi
			if [ "$MINSTART" = "" ]
			then
				MINSTART="${pwms}=${XMSTART}"
			else
				MINSTART="`echo $MINSTART | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=${XMSTART}"
			fi

			if [ $XMSTOP -gt 0 ]
			then
				echo
				echo "Enter the PWM value (0-$XMSTOP) to use when the temperature"
				echo -n "is below the low temperature limit (0): "
				read XMINP
			else
				XMINP=""
			fi
			if [ -n "$XMINP" ]
			then
				if [ "$MINPWM" = "" ]
				then
					MINPWM="${pwms}=${XMINP}"
				else
					MINPWM="`echo $MINPWM | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=${XMINP}"
				fi
			fi
			echo
			echo "Enter the PWM value ($XMSTOP-$MAX) to use when the temperature"
			echo -n "is over the high temperature limit ($MAX): "
			read XMAXP
			if [ -n "$XMAXP" ]
			then
				if [ "$MAXPWM" = "" ]
				then
					MAXPWM="${pwms}=${XMAXP}"
				else
					MAXPWM="`echo $MAXPWM | sed -e "s/${pwmsed}[^ ]* *//g"` ${pwms}=${XMAXP}"
				fi
			fi
			echo
			break;
		done
		break ;;

	*)
		echo "No such option. Enter a number."
		break ;;
	esac
done
done