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/pwmY
 280 Description:
 281                 Pulse width modulation fan control.
 282
 283                 Integer value in the range 0 to 255
 284
 285                 RW
 286
 287                 255 is max or 100%.
 288
 289 What:           /sys/class/hwmon/hwmonX/pwmY_enable
 290 Description:
 291                 Fan speed control method:
 292
 293                 - 0: no fan speed control (i.e. fan at full speed)
 294                 - 1: manual fan speed control enabled (using `pwmY`)
 295                 - 2+: automatic fan speed control enabled
 296
 297                 Check individual chip documentation files for automatic mode
 298                 details.
 299
 300                 RW
 301
 302 What:           /sys/class/hwmon/hwmonX/pwmY_mode
 303 Description:
 304                 - 0: DC mode (direct current)
 305                 - 1: PWM mode (pulse-width modulation)
 306
 307                 RW
 308
 309 What:           /sys/class/hwmon/hwmonX/pwmY_freq
 310 Description:
 311                 Base PWM frequency in Hz.
 312
 313                 Only possibly available when pwmN_mode is PWM, but not always
 314                 present even then.
 315
 316                 RW
 317
 318 What:           /sys/class/hwmon/hwmonX/pwmY_auto_channels_temp
 319 Description:
 320                 Select which temperature channels affect this PWM output in
 321                 auto mode.
 322
 323                 Bitfield, 1 is temp1, 2 is temp2, 4 is temp3 etc...
 324                 Which values are possible depend on the chip used.
 325
 326                 RW
 327
 328 What:           /sys/class/hwmon/hwmonX/pwmY_auto_pointZ_pwm
 329 What:           /sys/class/hwmon/hwmonX/pwmY_auto_pointZ_temp
 330 What:           /sys/class/hwmon/hwmonX/pwmY_auto_pointZ_temp_hyst
 331 Description:
 332                 Define the PWM vs temperature curve.
 333
 334                 Number of trip points is chip-dependent. Use this for chips
 335                 which associate trip points to PWM output channels.
 336
 337                 RW
 338
 339 What:           /sys/class/hwmon/hwmonX/tempY_auto_pointZ_pwm
 340 What:           /sys/class/hwmon/hwmonX/tempY_auto_pointZ_temp
 341 What:           /sys/class/hwmon/hwmonX/tempY_auto_pointZ_temp_hyst
 342 Description:
 343                 Define the PWM vs temperature curve.
 344
 345                 Number of trip points is chip-dependent. Use this for chips
 346                 which associate trip points to temperature channels.
 347
 348                 RW
 349
 350 What:           /sys/class/hwmon/hwmonX/tempY_type
 351 Description:
 352                 Sensor type selection.
 353
 354                 Integers 1 to 6
 355
 356                 RW
 357
 358                 - 1: CPU embedded diode
 359                 - 2: 3904 transistor
 360                 - 3: thermal diode
 361                 - 4: thermistor
 362                 - 5: AMD AMDSI
 363                 - 6: Intel PECI
 364
 365                 Not all types are supported by all chips
 366
 367 What:           /sys/class/hwmon/hwmonX/tempY_max
 368 Description:
 369                 Temperature max value.
 370
 371                 Unit: millidegree Celsius (or millivolt, see below)
 372
 373                 RW
 374
 375 What:           /sys/class/hwmon/hwmonX/tempY_min
 376 Description:
 377                 Temperature min value.
 378
 379                 Unit: millidegree Celsius
 380
 381                 RW
 382
 383 What:           /sys/class/hwmon/hwmonX/tempY_max_hyst
 384 Description:
 385                 Temperature hysteresis value for max limit.
 386
 387                 Unit: millidegree Celsius
 388
 389                 Must be reported as an absolute temperature, NOT a delta
 390                 from the max value.
 391
 392                 RW
 393
 394 What:           /sys/class/hwmon/hwmonX/tempY_min_hyst
 395 Description:
 396                 Temperature hysteresis value for min limit.
 397                 Unit: millidegree Celsius
 398
 399                 Must be reported as an absolute temperature, NOT a delta
 400                 from the min value.
 401
 402                 RW
 403
 404 What:           /sys/class/hwmon/hwmonX/tempY_input
 405 Description:
 406                 Temperature input value.
 407
 408                 Unit: millidegree Celsius
 409
 410                 RO
 411
 412 What:           /sys/class/hwmon/hwmonX/tempY_crit
 413 Description:
 414                 Temperature critical max value, typically greater than
 415                 corresponding temp_max values.
 416
 417                 Unit: millidegree Celsius
 418
 419                 RW
 420
 421 What:           /sys/class/hwmon/hwmonX/tempY_crit_alarm
 422 Description:
 423                 Critical high temperature alarm flag.
 424
 425                 - 0: OK
 426                 - 1: temperature has reached tempY_crit
 427
 428                 RW
 429
 430                 Contrary to regular alarm flags which clear themselves
 431                 automatically when read, this one sticks until cleared by
 432                 the user. This is done by writing 0 to the file. Writing
 433                 other values is unsupported.
 434
 435 What:           /sys/class/hwmon/hwmonX/tempY_crit_hyst
 436 Description:
 437                 Temperature hysteresis value for critical limit.
 438
 439                 Unit: millidegree Celsius
 440
 441                 Must be reported as an absolute temperature, NOT a delta
 442                 from the critical value.
 443
 444                 RW
 445
 446 What:           /sys/class/hwmon/hwmonX/tempY_emergency
 447 Description:
 448                 Temperature emergency max value, for chips supporting more than
 449                 two upper temperature limits. Must be equal or greater than
 450                 corresponding temp_crit values.
 451
 452                 Unit: millidegree Celsius
 453
 454                 RW
 455
 456 What:           /sys/class/hwmon/hwmonX/tempY_emergency_hyst
 457 Description:
 458                 Temperature hysteresis value for emergency limit.
 459
 460                 Unit: millidegree Celsius
 461
 462                 Must be reported as an absolute temperature, NOT a delta
 463                 from the emergency value.
 464
 465                 RW
 466
 467 What:           /sys/class/hwmon/hwmonX/tempY_lcrit
 468 Description:
 469                 Temperature critical min value, typically lower than
 470                 corresponding temp_min values.
 471
 472                 Unit: millidegree Celsius
 473
 474                 RW
 475
 476 What:           /sys/class/hwmon/hwmonX/tempY_lcrit_hyst
 477 Description:
 478                 Temperature hysteresis value for critical min limit.
 479
 480                 Unit: millidegree Celsius
 481
 482                 Must be reported as an absolute temperature, NOT a delta
 483                 from the critical min value.
 484
 485                 RW
 486
 487 What:           /sys/class/hwmon/hwmonX/tempY_offset
 488 Description:
 489                 Temperature offset which is added to the temperature reading
 490                 by the chip.
 491
 492                 Unit: millidegree Celsius
 493
 494                 Read/Write value.
 495
 496 What:           /sys/class/hwmon/hwmonX/tempY_label
 497 Description:
 498                 Suggested temperature channel label.
 499
 500                 Text string
 501
 502                 Should only be created if the driver has hints about what
 503                 this temperature channel is being used for, and user-space
 504                 doesn't. In all other cases, the label is provided by
 505                 user-space.
 506
 507                 RO
 508
 509 What:           /sys/class/hwmon/hwmonX/tempY_lowest
 510 Description:
 511                 Historical minimum temperature
 512
 513                 Unit: millidegree Celsius
 514
 515                 RO
 516
 517 What:           /sys/class/hwmon/hwmonX/tempY_highest
 518 Description:
 519                 Historical maximum temperature
 520
 521                 Unit: millidegree Celsius
 522
 523                 RO
 524
 525 What:           /sys/class/hwmon/hwmonX/tempY_reset_history
 526 Description:
 527                 Reset temp_lowest and temp_highest
 528
 529                 WO
 530
 531 What:           /sys/class/hwmon/hwmonX/temp_reset_history
 532 Description:
 533                 Reset temp_lowest and temp_highest for all sensors
 534
 535                 WO
 536
 537 What:           /sys/class/hwmon/hwmonX/tempY_enable
 538 Description:
 539                 Enable or disable the sensors.
 540
 541                 When disabled the sensor read will return -ENODATA.
 542
 543                 - 1: Enable
 544                 - 0: Disable
 545
 546                 RW
 547
 548 What:           /sys/class/hwmon/hwmonX/tempY_rated_min
 549 Description:
 550                 Minimum rated temperature.
 551
 552                 Unit: millidegree Celsius
 553
 554                 RO
 555
 556 What:           /sys/class/hwmon/hwmonX/tempY_rated_max
 557 Description:
 558                 Maximum rated temperature.
 559
 560                 Unit: millidegree Celsius
 561
 562                 RO
 563
 564 What:           /sys/class/hwmon/hwmonX/currY_max
 565 Description:
 566                 Current max value
 567
 568                 Unit: milliampere
 569
 570                 RW
 571
 572 What:           /sys/class/hwmon/hwmonX/currY_min
 573 Description:
 574                 Current min value.
 575
 576                 Unit: milliampere
 577
 578                 RW
 579
 580 What:           /sys/class/hwmon/hwmonX/currY_lcrit
 581 Description:
 582                 Current critical low value
 583
 584                 Unit: milliampere
 585
 586                 RW
 587
 588 What:           /sys/class/hwmon/hwmonX/currY_crit
 589 Description:
 590                 Current critical high value.
 591
 592                 Unit: milliampere
 593
 594                 RW
 595
 596 What:           /sys/class/hwmon/hwmonX/currY_input
 597 Description:
 598                 Current input value
 599
 600                 Unit: milliampere
 601
 602                 RO
 603
 604 What:           /sys/class/hwmon/hwmonX/currY_average
 605 Description:
 606                 Average current use
 607
 608                 Unit: milliampere
 609
 610                 RO
 611
 612 What:           /sys/class/hwmon/hwmonX/currY_lowest
 613 Description:
 614                 Historical minimum current
 615
 616                 Unit: milliampere
 617
 618                 RO
 619
 620 What:           /sys/class/hwmon/hwmonX/currY_highest
 621 Description:
 622                 Historical maximum current
 623                 Unit: milliampere
 624                 RO
 625
 626 What:           /sys/class/hwmon/hwmonX/currY_reset_history
 627 Description:
 628                 Reset currX_lowest and currX_highest
 629
 630                 WO
 631
 632 What:           /sys/class/hwmon/hwmonX/curr_reset_history
 633 Description:
 634                 Reset currX_lowest and currX_highest for all sensors
 635
 636                 WO
 637
 638 What:           /sys/class/hwmon/hwmonX/currY_enable
 639 Description:
 640                 Enable or disable the sensors.
 641
 642                 When disabled the sensor read will return -ENODATA.
 643
 644                 - 1: Enable
 645                 - 0: Disable
 646
 647                 RW
 648
 649 What:           /sys/class/hwmon/hwmonX/currY_rated_min
 650 Description:
 651                 Minimum rated current.
 652
 653                 Unit: milliampere
 654
 655                 RO
 656
 657 What:           /sys/class/hwmon/hwmonX/currY_rated_max
 658 Description:
 659                 Maximum rated current.
 660
 661                 Unit: milliampere
 662
 663                 RO
 664
 665 What:           /sys/class/hwmon/hwmonX/powerY_average
 666 Description:
 667                 Average power use
 668
 669                 Unit: microWatt
 670
 671                 RO
 672
 673 What:           /sys/class/hwmon/hwmonX/powerY_average_interval
 674 Description:
 675                 Power use averaging interval.  A poll
 676                 notification is sent to this file if the
 677                 hardware changes the averaging interval.
 678
 679                 Unit: milliseconds
 680
 681                 RW
 682
 683 What:           /sys/class/hwmon/hwmonX/powerY_average_interval_max
 684 Description:
 685                 Maximum power use averaging interval
 686
 687                 Unit: milliseconds
 688
 689                 RO
 690
 691 What:           /sys/class/hwmon/hwmonX/powerY_average_interval_min
 692 Description:
 693                 Minimum power use averaging interval
 694
 695                 Unit: milliseconds
 696
 697                 RO
 698
 699 What:           /sys/class/hwmon/hwmonX/powerY_average_highest
 700 Description:
 701                 Historical average maximum power use
 702
 703                 Unit: microWatt
 704
 705                 RO
 706
 707 What:           /sys/class/hwmon/hwmonX/powerY_average_lowest
 708 Description:
 709                 Historical average minimum power use
 710
 711                 Unit: microWatt
 712
 713                 RO
 714
 715 What:           /sys/class/hwmon/hwmonX/powerY_average_max
 716 Description:
 717                 A poll notification is sent to
 718                 `powerY_average` when power use
 719                 rises above this value.
 720
 721                 Unit: microWatt
 722
 723                 RW
 724
 725 What:           /sys/class/hwmon/hwmonX/powerY_average_min
 726 Description:
 727                 A poll notification is sent to
 728                 `powerY_average` when power use
 729                 sinks below this value.
 730
 731                 Unit: microWatt
 732
 733                 RW
 734
 735 What:           /sys/class/hwmon/hwmonX/powerY_input
 736 Description:
 737                 Instantaneous power use
 738
 739                 Unit: microWatt
 740
 741                 RO
 742
 743 What:           /sys/class/hwmon/hwmonX/powerY_input_highest
 744 Description:
 745                 Historical maximum power use
 746
 747                 Unit: microWatt
 748
 749                 RO
 750
 751 What:           /sys/class/hwmon/hwmonX/powerY_input_lowest
 752 Description:
 753                 Historical minimum power use
 754
 755                 Unit: microWatt
 756
 757                 RO
 758
 759 What:           /sys/class/hwmon/hwmonX/powerY_reset_history
 760 Description:
 761                 Reset input_highest, input_lowest,
 762                 average_highest and average_lowest.
 763
 764                 WO
 765
 766 What:           /sys/class/hwmon/hwmonX/powerY_accuracy
 767 Description:
 768                 Accuracy of the power meter.
 769
 770                 Unit: Percent
 771
 772                 RO
 773
 774 What:           /sys/class/hwmon/hwmonX/powerY_cap
 775 Description:
 776                 If power use rises above this limit, the
 777                 system should take action to reduce power use.
 778                 A poll notification is sent to this file if the
 779                 cap is changed by the hardware.  The `*_cap`
 780                 files only appear if the cap is known to be
 781                 enforced by hardware.
 782
 783                 Unit: microWatt
 784
 785                 RW
 786
 787 What:           /sys/class/hwmon/hwmonX/powerY_cap_hyst
 788 Description:
 789                 Margin of hysteresis built around capping and
 790                 notification.
 791
 792                 Unit: microWatt
 793
 794                 RW
 795
 796 What:           /sys/class/hwmon/hwmonX/powerY_cap_max
 797 Description:
 798                 Maximum cap that can be set.
 799
 800                 Unit: microWatt
 801
 802                 RO
 803
 804 What:           /sys/class/hwmon/hwmonX/powerY_cap_min
 805 Description:
 806                 Minimum cap that can be set.
 807
 808                 Unit: microWatt
 809
 810                 RO
 811
 812 What:           /sys/class/hwmon/hwmonX/powerY_max
 813 Description:
 814                 Maximum power.
 815
 816                 Unit: microWatt
 817
 818                 RW
 819
 820 What:           /sys/class/hwmon/hwmonX/powerY_crit
 821 Description:
 822                 Critical maximum power.
 823
 824                 If power rises to or above this limit, the
 825                 system is expected take drastic action to reduce
 826                 power consumption, such as a system shutdown or
 827                 a forced powerdown of some devices.
 828
 829                 Unit: microWatt
 830
 831                 RW
 832
 833 What:           /sys/class/hwmon/hwmonX/powerY_enable
 834 Description:
 835                 Enable or disable the sensors.
 836
 837                 When disabled the sensor read will return
 838                 -ENODATA.
 839
 840                 - 1: Enable
 841                 - 0: Disable
 842
 843                 RW
 844
 845 What:           /sys/class/hwmon/hwmonX/powerY_rated_min
 846 Description:
 847                 Minimum rated power.
 848
 849                 Unit: microWatt
 850
 851                 RO
 852
 853 What:           /sys/class/hwmon/hwmonX/powerY_rated_max
 854 Description:
 855                 Maximum rated power.
 856
 857                 Unit: microWatt
 858
 859                 RO
 860
 861 What:           /sys/class/hwmon/hwmonX/energyY_input
 862 Description:
 863                 Cumulative energy use
 864
 865                 Unit: microJoule
 866
 867                 RO
 868
 869 What:           /sys/class/hwmon/hwmonX/energyY_enable
 870 Description:
 871                 Enable or disable the sensors.
 872
 873                 When disabled the sensor read will return
 874                 -ENODATA.
 875
 876                 - 1: Enable
 877                 - 0: Disable
 878
 879                 RW
 880
 881 What:           /sys/class/hwmon/hwmonX/humidityY_input
 882 Description:
 883                 Humidity
 884
 885                 Unit: milli-percent (per cent mille, pcm)
 886
 887                 RO
 888
 889
 890 What:           /sys/class/hwmon/hwmonX/humidityY_enable
 891 Description:
 892                 Enable or disable the sensors
 893
 894                 When disabled the sensor read will return
 895                 -ENODATA.
 896
 897                 - 1: Enable
 898                 - 0: Disable
 899
 900                 RW
 901
 902 What:           /sys/class/hwmon/hwmonX/humidityY_rated_min
 903 Description:
 904                 Minimum rated humidity.
 905
 906                 Unit: milli-percent (per cent mille, pcm)
 907
 908                 RO
 909
 910 What:           /sys/class/hwmon/hwmonX/humidityY_rated_max
 911 Description:
 912                 Maximum rated humidity.
 913
 914                 Unit: milli-percent (per cent mille, pcm)
 915
 916                 RO
 917
 918
 919 What:           /sys/class/hwmon/hwmonX/intrusionY_alarm
 920 Description:
 921                 Chassis intrusion detection
 922
 923                 - 0: OK
 924                 - 1: intrusion detected
 925
 926                 RW
 927
 928                 Contrary to regular alarm flags which clear themselves
 929                 automatically when read, this one sticks until cleared by
 930                 the user. This is done by writing 0 to the file. Writing
 931                 other values is unsupported.
 932
 933 What:           /sys/class/hwmon/hwmonX/intrusionY_beep
 934 Description:
 935                 Chassis intrusion beep
 936
 937                 - 0: disable
 938                 - 1: enable
 939
 940                 RW
 941
 942 What:           /sys/class/hwmon/hwmonX/device/pec
 943 Description:
 944                 PEC support on I2C devices
 945
 946                 - 0, off, n: disable
 947                 - 1, on, y: enable
 948
 949                 RW