Documentation/ABI/testing/sysfs-class-hwmon

   1 What:           /sys/class/hwmon/hwmonX/name
   2 Description:
   3                 The chip name.
   4                 This should be a short, lowercase string, not containing
   5                 whitespace, dashes, or the wildcard character '*'.
   6                 This attribute represents the chip name. It is the only
   7                 mandatory attribute.
   8                 I2C devices get this attribute created automatically.
   9
  10                 RO
  11
  12 What:           /sys/class/hwmon/hwmonX/label
  13 Description:
  14                 A descriptive label that allows to uniquely identify a
  15                 device within the system.
  16                 The contents of the label are free-form.
  17
  18                 RO
  19
  20 What:           /sys/class/hwmon/hwmonX/update_interval
  21 Description:
  22                 The interval at which the chip will update readings.
  23                 Unit: millisecond
  24
  25                 RW
  26
  27                 Some devices have a variable update rate or interval.
  28                 This attribute can be used to change it to the desired value.
  29
  30 What:           /sys/class/hwmon/hwmonX/inY_min
  31 Description:
  32                 Voltage min value.
  33
  34                 Unit: millivolt
  35
  36                 RW
  37
  38 What:           /sys/class/hwmon/hwmonX/inY_lcrit
  39 Description:
  40                 Voltage critical min value.
  41
  42                 Unit: millivolt
  43
  44                 RW
  45
  46                 If voltage drops to or below this limit, the system may
  47                 take drastic action such as power down or reset. At the very
  48                 least, it should report a fault.
  49
  50 What:           /sys/class/hwmon/hwmonX/inY_max
  51 Description:
  52                 Voltage max value.
  53
  54                 Unit: millivolt
  55
  56                 RW
  57
  58 What:           /sys/class/hwmon/hwmonX/inY_crit
  59 Description:
  60                 Voltage critical max value.
  61
  62                 Unit: millivolt
  63
  64                 RW
  65
  66                 If voltage reaches or exceeds this limit, the system may
  67                 take drastic action such as power down or reset. At the very
  68                 least, it should report a fault.
  69
  70 What:           /sys/class/hwmon/hwmonX/inY_input
  71 Description:
  72                 Voltage input value.
  73
  74                 Unit: millivolt
  75
  76                 RO
  77
  78                 Voltage measured on the chip pin.
  79
  80                 Actual voltage depends on the scaling resistors on the
  81                 motherboard, as recommended in the chip datasheet.
  82
  83                 This varies by chip and by motherboard.
  84                 Because of this variation, values are generally NOT scaled
  85                 by the chip driver, and must be done by the application.
  86                 However, some drivers (notably lm87 and via686a)
  87                 do scale, because of internal resistors built into a chip.
  88                 These drivers will output the actual voltage. Rule of
  89                 thumb: drivers should report the voltage values at the
  90                 "pins" of the chip.
  91
  92 What:           /sys/class/hwmon/hwmonX/inY_average
  93 Description:
  94                 Average voltage
  95
  96                 Unit: millivolt
  97
  98                 RO
  99
 100 What:           /sys/class/hwmon/hwmonX/inY_lowest
 101 Description:
 102                 Historical minimum voltage
 103
 104                 Unit: millivolt
 105
 106                 RO
 107
 108 What:           /sys/class/hwmon/hwmonX/inY_highest
 109 Description:
 110                 Historical maximum voltage
 111
 112                 Unit: millivolt
 113
 114                 RO
 115
 116 What:           /sys/class/hwmon/hwmonX/inY_reset_history
 117 Description:
 118                 Reset inX_lowest and inX_highest
 119
 120                 WO
 121
 122 What:           /sys/class/hwmon/hwmonX/in_reset_history
 123 Description:
 124                 Reset inX_lowest and inX_highest for all sensors
 125
 126                 WO
 127
 128 What:           /sys/class/hwmon/hwmonX/inY_label
 129 Description:
 130                 Suggested voltage channel label.
 131
 132                 Text string
 133
 134                 Should only be created if the driver has hints about what
 135                 this voltage channel is being used for, and user-space
 136                 doesn't. In all other cases, the label is provided by
 137                 user-space.
 138
 139                 RO
 140
 141 What:           /sys/class/hwmon/hwmonX/inY_enable
 142 Description:
 143                 Enable or disable the sensors.
 144
 145                 When disabled the sensor read will return -ENODATA.
 146
 147                 - 1: Enable
 148                 - 0: Disable
 149
 150                 RW
 151
 152 What:           /sys/class/hwmon/hwmonX/cpuY_vid
 153 Description:
 154                 CPU core reference voltage.
 155
 156                 Unit: millivolt
 157
 158                 RO
 159
 160                 Not always correct.
 161
 162 What:           /sys/class/hwmon/hwmonX/vrm
 163 Description:
 164                 Voltage Regulator Module version number.
 165
 166                 RW (but changing it should no more be necessary)
 167
 168                 Originally the VRM standard version multiplied by 10, but now
 169                 an arbitrary number, as not all standards have a version
 170                 number.
 171
 172                 Affects the way the driver calculates the CPU core reference
 173                 voltage from the vid pins.
 174
 175 What:           /sys/class/hwmon/hwmonX/inY_rated_min
 176 Description:
 177                 Minimum rated voltage.
 178
 179                 Unit: millivolt
 180
 181                 RO
 182
 183 What:           /sys/class/hwmon/hwmonX/inY_rated_max
 184 Description:
 185                 Maximum rated voltage.
 186
 187                 Unit: millivolt
 188
 189                 RO
 190
 191 What:           /sys/class/hwmon/hwmonX/fanY_min
 192 Description:
 193                 Fan minimum value
 194
 195                 Unit: revolution/min (RPM)
 196
 197                 RW
 198
 199 What:           /sys/class/hwmon/hwmonX/fanY_max
 200 Description:
 201                 Fan maximum value
 202
 203                 Unit: revolution/min (RPM)
 204
 205                 Only rarely supported by the hardware.
 206                 RW
 207
 208 What:           /sys/class/hwmon/hwmonX/fanY_input
 209 Description:
 210                 Fan input value.
 211
 212                 Unit: revolution/min (RPM)
 213
 214                 RO
 215
 216 What:           /sys/class/hwmon/hwmonX/fanY_div
 217 Description:
 218                 Fan divisor.
 219
 220                 Integer value in powers of two (1, 2, 4, 8, 16, 32, 64, 128).
 221
 222                 RW
 223
 224                 Some chips only support values 1, 2, 4 and 8.
 225                 Note that this is actually an internal clock divisor, which
 226                 affects the measurable speed range, not the read value.
 227
 228 What:           /sys/class/hwmon/hwmonX/fanY_pulses
 229 Description:
 230                 Number of tachometer pulses per fan revolution.
 231
 232                 Integer value, typically between 1 and 4.
 233
 234                 RW
 235
 236                 This value is a characteristic of the fan connected to the
 237                 device's input, so it has to be set in accordance with the fan
 238                 model.
 239
 240                 Should only be created if the chip has a register to configure
 241                 the number of pulses. In the absence of such a register (and
 242                 thus attribute) the value assumed by all devices is 2 pulses
 243                 per fan revolution.
 244
 245 What:           /sys/class/hwmon/hwmonX/fanY_target
 246 Description:
 247                 Desired fan speed
 248
 249                 Unit: revolution/min (RPM)
 250
 251                 RW
 252
 253                 Only makes sense if the chip supports closed-loop fan speed
 254                 control based on the measured fan speed.
 255
 256 What:           /sys/class/hwmon/hwmonX/fanY_label
 257 Description:
 258                 Suggested fan channel label.
 259
 260                 Text string
 261
 262                 Should only be created if the driver has hints about what
 263                 this fan channel is being used for, and user-space doesn't.
 264                 In all other cases, the label is provided by user-space.
 265
 266                 RO
 267
 268 What:           /sys/class/hwmon/hwmonX/fanY_enable
 269 Description:
 270                 Enable or disable the sensors.
 271
 272                 When disabled the sensor read will return -ENODATA.
 273
 274                 - 1: Enable
 275                 - 0: Disable
 276
 277                 RW
 278
 279 What:           /sys/class/hwmon/hwmonX/fanY_fault
 280 Description:
 281                 Reports if a fan has reported failure.
 282
 283                 - 1: Failed
 284                 - 0: Ok
 285
 286                 RO
 287
 288 What:           /sys/class/hwmon/hwmonX/pwmY
 289 Description:
 290                 Pulse width modulation fan control.
 291
 292                 Integer value in the range 0 to 255
 293
 294                 RW
 295
 296                 255 is max or 100%.
 297
 298 What:           /sys/class/hwmon/hwmonX/pwmY_enable
 299 Description:
 300                 Fan speed control method:
 301
 302                 - 0: no fan speed control (i.e. fan at full speed)
 303                 - 1: manual fan speed control enabled (using `pwmY`)
 304                 - 2+: automatic fan speed control enabled
 305
 306                 Check individual chip documentation files for automatic mode
 307                 details.
 308
 309                 RW
 310
 311 What:           /sys/class/hwmon/hwmonX/pwmY_mode
 312 Description:
 313                 - 0: DC mode (direct current)
 314                 - 1: PWM mode (pulse-width modulation)
 315
 316                 RW
 317
 318 What:           /sys/class/hwmon/hwmonX/pwmY_freq
 319 Description:
 320                 Base PWM frequency in Hz.
 321
 322                 Only possibly available when pwmN_mode is PWM, but not always
 323                 present even then.
 324
 325                 RW
 326
 327 What:           /sys/class/hwmon/hwmonX/pwmY_auto_channels_temp
 328 Description:
 329                 Select which temperature channels affect this PWM output in
 330                 auto mode.
 331
 332                 Bitfield, 1 is temp1, 2 is temp2, 4 is temp3 etc...
 333                 Which values are possible depend on the chip used.
 334
 335                 RW
 336
 337 What:           /sys/class/hwmon/hwmonX/pwmY_auto_pointZ_pwm
 338 What:           /sys/class/hwmon/hwmonX/pwmY_auto_pointZ_temp
 339 What:           /sys/class/hwmon/hwmonX/pwmY_auto_pointZ_temp_hyst
 340 Description:
 341                 Define the PWM vs temperature curve.
 342
 343                 Number of trip points is chip-dependent. Use this for chips
 344                 which associate trip points to PWM output channels.
 345
 346                 RW
 347
 348 What:           /sys/class/hwmon/hwmonX/tempY_auto_pointZ_pwm
 349 What:           /sys/class/hwmon/hwmonX/tempY_auto_pointZ_temp
 350 What:           /sys/class/hwmon/hwmonX/tempY_auto_pointZ_temp_hyst
 351 Description:
 352                 Define the PWM vs temperature curve.
 353
 354                 Number of trip points is chip-dependent. Use this for chips
 355                 which associate trip points to temperature channels.
 356
 357                 RW
 358
 359 What:           /sys/class/hwmon/hwmonX/tempY_type
 360 Description:
 361                 Sensor type selection.
 362
 363                 Integers 1 to 6
 364
 365                 RW
 366
 367                 - 1: CPU embedded diode
 368                 - 2: 3904 transistor
 369                 - 3: thermal diode
 370                 - 4: thermistor
 371                 - 5: AMD AMDSI
 372                 - 6: Intel PECI
 373
 374                 Not all types are supported by all chips
 375
 376 What:           /sys/class/hwmon/hwmonX/tempY_max
 377 Description:
 378                 Temperature max value.
 379
 380                 Unit: millidegree Celsius (or millivolt, see below)
 381
 382                 RW
 383
 384 What:           /sys/class/hwmon/hwmonX/tempY_min
 385 Description:
 386                 Temperature min value.
 387
 388                 Unit: millidegree Celsius
 389
 390                 RW
 391
 392 What:           /sys/class/hwmon/hwmonX/tempY_max_hyst
 393 Description:
 394                 Temperature hysteresis value for max limit.
 395
 396                 Unit: millidegree Celsius
 397
 398                 Must be reported as an absolute temperature, NOT a delta
 399                 from the max value.
 400
 401                 RW
 402
 403 What:           /sys/class/hwmon/hwmonX/tempY_min_hyst
 404 Description:
 405                 Temperature hysteresis value for min limit.
 406                 Unit: millidegree Celsius
 407
 408                 Must be reported as an absolute temperature, NOT a delta
 409                 from the min value.
 410
 411                 RW
 412
 413 What:           /sys/class/hwmon/hwmonX/tempY_input
 414 Description:
 415                 Temperature input value.
 416
 417                 Unit: millidegree Celsius
 418
 419                 RO
 420
 421 What:           /sys/class/hwmon/hwmonX/tempY_crit
 422 Description:
 423                 Temperature critical max value, typically greater than
 424                 corresponding temp_max values.
 425
 426                 Unit: millidegree Celsius
 427
 428                 RW
 429
 430 What:           /sys/class/hwmon/hwmonX/tempY_crit_alarm
 431 Description:
 432                 Critical high temperature alarm flag.
 433
 434                 - 0: OK
 435                 - 1: temperature has reached tempY_crit
 436
 437                 RW
 438
 439                 Contrary to regular alarm flags which clear themselves
 440                 automatically when read, this one sticks until cleared by
 441                 the user. This is done by writing 0 to the file. Writing
 442                 other values is unsupported.
 443
 444 What:           /sys/class/hwmon/hwmonX/tempY_crit_hyst
 445 Description:
 446                 Temperature hysteresis value for critical limit.
 447
 448                 Unit: millidegree Celsius
 449
 450                 Must be reported as an absolute temperature, NOT a delta
 451                 from the critical value.
 452
 453                 RW
 454
 455 What:           /sys/class/hwmon/hwmonX/tempY_emergency
 456 Description:
 457                 Temperature emergency max value, for chips supporting more than
 458                 two upper temperature limits. Must be equal or greater than
 459                 corresponding temp_crit values.
 460
 461                 Unit: millidegree Celsius
 462
 463                 RW
 464
 465 What:           /sys/class/hwmon/hwmonX/tempY_emergency_hyst
 466 Description:
 467                 Temperature hysteresis value for emergency limit.
 468
 469                 Unit: millidegree Celsius
 470
 471                 Must be reported as an absolute temperature, NOT a delta
 472                 from the emergency value.
 473
 474                 RW
 475
 476 What:           /sys/class/hwmon/hwmonX/tempY_lcrit
 477 Description:
 478                 Temperature critical min value, typically lower than
 479                 corresponding temp_min values.
 480
 481                 Unit: millidegree Celsius
 482
 483                 RW
 484
 485 What:           /sys/class/hwmon/hwmonX/tempY_lcrit_hyst
 486 Description:
 487                 Temperature hysteresis value for critical min limit.
 488
 489                 Unit: millidegree Celsius
 490
 491                 Must be reported as an absolute temperature, NOT a delta
 492                 from the critical min value.
 493
 494                 RW
 495
 496 What:           /sys/class/hwmon/hwmonX/tempY_offset
 497 Description:
 498                 Temperature offset which is added to the temperature reading
 499                 by the chip.
 500
 501                 Unit: millidegree Celsius
 502
 503                 Read/Write value.
 504
 505 What:           /sys/class/hwmon/hwmonX/tempY_label
 506 Description:
 507                 Suggested temperature channel label.
 508
 509                 Text string
 510
 511                 Should only be created if the driver has hints about what
 512                 this temperature channel is being used for, and user-space
 513                 doesn't. In all other cases, the label is provided by
 514                 user-space.
 515
 516                 RO
 517
 518 What:           /sys/class/hwmon/hwmonX/tempY_lowest
 519 Description:
 520                 Historical minimum temperature
 521
 522                 Unit: millidegree Celsius
 523
 524                 RO
 525
 526 What:           /sys/class/hwmon/hwmonX/tempY_highest
 527 Description:
 528                 Historical maximum temperature
 529
 530                 Unit: millidegree Celsius
 531
 532                 RO
 533
 534 What:           /sys/class/hwmon/hwmonX/tempY_reset_history
 535 Description:
 536                 Reset temp_lowest and temp_highest
 537
 538                 WO
 539
 540 What:           /sys/class/hwmon/hwmonX/temp_reset_history
 541 Description:
 542                 Reset temp_lowest and temp_highest for all sensors
 543
 544                 WO
 545
 546 What:           /sys/class/hwmon/hwmonX/tempY_enable
 547 Description:
 548                 Enable or disable the sensors.
 549
 550                 When disabled the sensor read will return -ENODATA.
 551
 552                 - 1: Enable
 553                 - 0: Disable
 554
 555                 RW
 556
 557 What:           /sys/class/hwmon/hwmonX/tempY_rated_min
 558 Description:
 559                 Minimum rated temperature.
 560
 561                 Unit: millidegree Celsius
 562
 563                 RO
 564
 565 What:           /sys/class/hwmon/hwmonX/tempY_rated_max
 566 Description:
 567                 Maximum rated temperature.
 568
 569                 Unit: millidegree Celsius
 570
 571                 RO
 572
 573 What:           /sys/class/hwmon/hwmonX/currY_max
 574 Description:
 575                 Current max value
 576
 577                 Unit: milliampere
 578
 579                 RW
 580
 581 What:           /sys/class/hwmon/hwmonX/currY_min
 582 Description:
 583                 Current min value.
 584
 585                 Unit: milliampere
 586
 587                 RW
 588
 589 What:           /sys/class/hwmon/hwmonX/currY_lcrit
 590 Description:
 591                 Current critical low value
 592
 593                 Unit: milliampere
 594
 595                 RW
 596
 597 What:           /sys/class/hwmon/hwmonX/currY_crit
 598 Description:
 599                 Current critical high value.
 600
 601                 Unit: milliampere
 602
 603                 RW
 604
 605 What:           /sys/class/hwmon/hwmonX/currY_input
 606 Description:
 607                 Current input value
 608
 609                 Unit: milliampere
 610
 611                 RO
 612
 613 What:           /sys/class/hwmon/hwmonX/currY_average
 614 Description:
 615                 Average current use
 616
 617                 Unit: milliampere
 618
 619                 RO
 620
 621 What:           /sys/class/hwmon/hwmonX/currY_lowest
 622 Description:
 623                 Historical minimum current
 624
 625                 Unit: milliampere
 626
 627                 RO
 628
 629 What:           /sys/class/hwmon/hwmonX/currY_highest
 630 Description:
 631                 Historical maximum current
 632                 Unit: milliampere
 633                 RO
 634
 635 What:           /sys/class/hwmon/hwmonX/currY_reset_history
 636 Description:
 637                 Reset currX_lowest and currX_highest
 638
 639                 WO
 640
 641 What:           /sys/class/hwmon/hwmonX/curr_reset_history
 642 Description:
 643                 Reset currX_lowest and currX_highest for all sensors
 644
 645                 WO
 646
 647 What:           /sys/class/hwmon/hwmonX/currY_enable
 648 Description:
 649                 Enable or disable the sensors.
 650
 651                 When disabled the sensor read will return -ENODATA.
 652
 653                 - 1: Enable
 654                 - 0: Disable
 655
 656                 RW
 657
 658 What:           /sys/class/hwmon/hwmonX/currY_rated_min
 659 Description:
 660                 Minimum rated current.
 661
 662                 Unit: milliampere
 663
 664                 RO
 665
 666 What:           /sys/class/hwmon/hwmonX/currY_rated_max
 667 Description:
 668                 Maximum rated current.
 669
 670                 Unit: milliampere
 671
 672                 RO
 673
 674 What:           /sys/class/hwmon/hwmonX/powerY_average
 675 Description:
 676                 Average power use
 677
 678                 Unit: microWatt
 679
 680                 RO
 681
 682 What:           /sys/class/hwmon/hwmonX/powerY_average_interval
 683 Description:
 684                 Power use averaging interval.  A poll
 685                 notification is sent to this file if the
 686                 hardware changes the averaging interval.
 687
 688                 Unit: milliseconds
 689
 690                 RW
 691
 692 What:           /sys/class/hwmon/hwmonX/powerY_average_interval_max
 693 Description:
 694                 Maximum power use averaging interval
 695
 696                 Unit: milliseconds
 697
 698                 RO
 699
 700 What:           /sys/class/hwmon/hwmonX/powerY_average_interval_min
 701 Description:
 702                 Minimum power use averaging interval
 703
 704                 Unit: milliseconds
 705
 706                 RO
 707
 708 What:           /sys/class/hwmon/hwmonX/powerY_average_highest
 709 Description:
 710                 Historical average maximum power use
 711
 712                 Unit: microWatt
 713
 714                 RO
 715
 716 What:           /sys/class/hwmon/hwmonX/powerY_average_lowest
 717 Description:
 718                 Historical average minimum power use
 719
 720                 Unit: microWatt
 721
 722                 RO
 723
 724 What:           /sys/class/hwmon/hwmonX/powerY_average_max
 725 Description:
 726                 A poll notification is sent to
 727                 `powerY_average` when power use
 728                 rises above this value.
 729
 730                 Unit: microWatt
 731
 732                 RW
 733
 734 What:           /sys/class/hwmon/hwmonX/powerY_average_min
 735 Description:
 736                 A poll notification is sent to
 737                 `powerY_average` when power use
 738                 sinks below this value.
 739
 740                 Unit: microWatt
 741
 742                 RW
 743
 744 What:           /sys/class/hwmon/hwmonX/powerY_input
 745 Description:
 746                 Instantaneous power use
 747
 748                 Unit: microWatt
 749
 750                 RO
 751
 752 What:           /sys/class/hwmon/hwmonX/powerY_input_highest
 753 Description:
 754                 Historical maximum power use
 755
 756                 Unit: microWatt
 757
 758                 RO
 759
 760 What:           /sys/class/hwmon/hwmonX/powerY_input_lowest
 761 Description:
 762                 Historical minimum power use
 763
 764                 Unit: microWatt
 765
 766                 RO
 767
 768 What:           /sys/class/hwmon/hwmonX/powerY_reset_history
 769 Description:
 770                 Reset input_highest, input_lowest,
 771                 average_highest and average_lowest.
 772
 773                 WO
 774
 775 What:           /sys/class/hwmon/hwmonX/powerY_accuracy
 776 Description:
 777                 Accuracy of the power meter.
 778
 779                 Unit: Percent
 780
 781                 RO
 782
 783 What:           /sys/class/hwmon/hwmonX/powerY_cap
 784 Description:
 785                 If power use rises above this limit, the
 786                 system should take action to reduce power use.
 787                 A poll notification is sent to this file if the
 788                 cap is changed by the hardware.  The `*_cap`
 789                 files only appear if the cap is known to be
 790                 enforced by hardware.
 791
 792                 Unit: microWatt
 793
 794                 RW
 795
 796 What:           /sys/class/hwmon/hwmonX/powerY_cap_hyst
 797 Description:
 798                 Margin of hysteresis built around capping and
 799                 notification.
 800
 801                 Unit: microWatt
 802
 803                 RW
 804
 805 What:           /sys/class/hwmon/hwmonX/powerY_cap_max
 806 Description:
 807                 Maximum cap that can be set.
 808
 809                 Unit: microWatt
 810
 811                 RO
 812
 813 What:           /sys/class/hwmon/hwmonX/powerY_cap_min
 814 Description:
 815                 Minimum cap that can be set.
 816
 817                 Unit: microWatt
 818
 819                 RO
 820
 821 What:           /sys/class/hwmon/hwmonX/powerY_max
 822 Description:
 823                 Maximum power.
 824
 825                 Unit: microWatt
 826
 827                 RW
 828
 829 What:           /sys/class/hwmon/hwmonX/powerY_crit
 830 Description:
 831                 Critical maximum power.
 832
 833                 If power rises to or above this limit, the
 834                 system is expected take drastic action to reduce
 835                 power consumption, such as a system shutdown or
 836                 a forced powerdown of some devices.
 837
 838                 Unit: microWatt
 839
 840                 RW
 841
 842 What:           /sys/class/hwmon/hwmonX/powerY_enable
 843 Description:
 844                 Enable or disable the sensors.
 845
 846                 When disabled the sensor read will return
 847                 -ENODATA.
 848
 849                 - 1: Enable
 850                 - 0: Disable
 851
 852                 RW
 853
 854 What:           /sys/class/hwmon/hwmonX/powerY_rated_min
 855 Description:
 856                 Minimum rated power.
 857
 858                 Unit: microWatt
 859
 860                 RO
 861
 862 What:           /sys/class/hwmon/hwmonX/powerY_rated_max
 863 Description:
 864                 Maximum rated power.
 865
 866                 Unit: microWatt
 867
 868                 RO
 869
 870 What:           /sys/class/hwmon/hwmonX/energyY_input
 871 Description:
 872                 Cumulative energy use
 873
 874                 Unit: microJoule
 875
 876                 RO
 877
 878 What:           /sys/class/hwmon/hwmonX/energyY_enable
 879 Description:
 880                 Enable or disable the sensors.
 881
 882                 When disabled the sensor read will return
 883                 -ENODATA.
 884
 885                 - 1: Enable
 886                 - 0: Disable
 887
 888                 RW
 889
 890 What:           /sys/class/hwmon/hwmonX/humidityY_input
 891 Description:
 892                 Humidity
 893
 894                 Unit: milli-percent (per cent mille, pcm)
 895
 896                 RO
 897
 898
 899 What:           /sys/class/hwmon/hwmonX/humidityY_enable
 900 Description:
 901                 Enable or disable the sensors
 902
 903                 When disabled the sensor read will return
 904                 -ENODATA.
 905
 906                 - 1: Enable
 907                 - 0: Disable
 908
 909                 RW
 910
 911 What:           /sys/class/hwmon/hwmonX/humidityY_rated_min
 912 Description:
 913                 Minimum rated humidity.
 914
 915                 Unit: milli-percent (per cent mille, pcm)
 916
 917                 RO
 918
 919 What:           /sys/class/hwmon/hwmonX/humidityY_rated_max
 920 Description:
 921                 Maximum rated humidity.
 922
 923                 Unit: milli-percent (per cent mille, pcm)
 924
 925                 RO
 926
 927
 928 What:           /sys/class/hwmon/hwmonX/intrusionY_alarm
 929 Description:
 930                 Chassis intrusion detection
 931
 932                 - 0: OK
 933                 - 1: intrusion detected
 934
 935                 RW
 936
 937                 Contrary to regular alarm flags which clear themselves
 938                 automatically when read, this one sticks until cleared by
 939                 the user. This is done by writing 0 to the file. Writing
 940                 other values is unsupported.
 941
 942 What:           /sys/class/hwmon/hwmonX/intrusionY_beep
 943 Description:
 944                 Chassis intrusion beep
 945
 946                 - 0: disable
 947                 - 1: enable
 948
 949                 RW
 950
 951 What:           /sys/class/hwmon/hwmonX/device/pec
 952 Description:
 953                 PEC support on I2C devices
 954
 955                 - 0, off, n: disable
 956                 - 1, on, y: enable
 957
 958                 RW