Documentation/ABI/testing/sysfs-class-power

   1 **General Properties**
   2
   3 What:           /sys/class/power_supply/<supply_name>/manufacturer
   4 Date:           May 2007
   5 Contact:        linux-pm@vger.kernel.org
   6 Description:
   7                 Reports the name of the device manufacturer.
   8
   9                 Access: Read
  10                 Valid values: Represented as string
  11
  12 What:           /sys/class/power_supply/<supply_name>/model_name
  13 Date:           May 2007
  14 Contact:        linux-pm@vger.kernel.org
  15 Description:
  16                 Reports the name of the device model.
  17
  18                 Access: Read
  19                 Valid values: Represented as string
  20
  21 What:           /sys/class/power_supply/<supply_name>/serial_number
  22 Date:           January 2008
  23 Contact:        linux-pm@vger.kernel.org
  24 Description:
  25                 Reports the serial number of the device.
  26
  27                 Access: Read
  28                 Valid values: Represented as string
  29
  30 What:           /sys/class/power_supply/<supply_name>/type
  31 Date:           May 2010
  32 Contact:        linux-pm@vger.kernel.org
  33 Description:
  34                 Describes the main type of the supply.
  35
  36                 Access: Read
  37                 Valid values: "Battery", "UPS", "Mains", "USB", "Wireless"
  38
  39 **Battery and USB properties**
  40
  41 What:           /sys/class/power_supply/<supply_name>/current_avg
  42 Date:           May 2007
  43 Contact:        linux-pm@vger.kernel.org
  44 Description:
  45                 Battery:
  46
  47                   Reports an average IBAT current reading for the battery, over
  48                   a fixed period. Normally devices will provide a fixed interval
  49                   in which they average readings to smooth out the reported
  50                   value.
  51
  52                 USB:
  53
  54                   Reports an average IBUS current reading over a fixed period.
  55                   Normally devices will provide a fixed interval in which they
  56                   average readings to smooth out the reported value.
  57
  58                 Access: Read
  59
  60                 Valid values: Represented in microamps. Negative values are
  61                 used for discharging batteries, positive values for charging
  62                 batteries and for USB IBUS current.
  63
  64 What:           /sys/class/power_supply/<supply_name>/current_max
  65 Date:           October 2010
  66 Contact:        linux-pm@vger.kernel.org
  67 Description:
  68                 Battery:
  69
  70                   Reports the maximum IBAT current allowed into the battery.
  71
  72                 USB:
  73
  74                   Reports the maximum IBUS current the supply can support.
  75
  76                 Access: Read
  77                 Valid values: Represented in microamps
  78
  79 What:           /sys/class/power_supply/<supply_name>/current_now
  80 Date:           May 2007
  81 Contact:        linux-pm@vger.kernel.org
  82 Description:
  83
  84                 Battery:
  85
  86                   Reports an instant, single IBAT current reading for the
  87                   battery. This value is not averaged/smoothed.
  88
  89                   Access: Read
  90
  91                 USB:
  92
  93                   Reports the IBUS current supplied now. This value is generally
  94                   read-only reporting, unless the 'online' state of the supply
  95                   is set to be programmable, in which case this value can be set
  96                   within the reported min/max range.
  97
  98                   Access: Read, Write
  99
 100                 Valid values: Represented in microamps. Negative values are
 101                 used for discharging batteries, positive values for charging
 102                 batteries and for USB IBUS current.
 103
 104 What:           /sys/class/power_supply/<supply_name>/temp
 105 Date:           May 2007
 106 Contact:        linux-pm@vger.kernel.org
 107 Description:
 108                 Battery:
 109
 110                   Reports the current TBAT battery temperature reading.
 111
 112                 USB:
 113
 114                   Reports the current supply temperature reading. This would
 115                   normally be the internal temperature of the device itself
 116                   (e.g TJUNC temperature of an IC)
 117
 118                 Access: Read
 119
 120                 Valid values: Represented in 1/10 Degrees Celsius
 121
 122 What:           /sys/class/power_supply/<supply_name>/temp_alert_max
 123 Date:           July 2012
 124 Contact:        linux-pm@vger.kernel.org
 125 Description:
 126                 Battery:
 127
 128                   Maximum TBAT temperature trip-wire value where the supply will
 129                   notify user-space of the event.
 130
 131                 USB:
 132
 133                   Maximum supply temperature trip-wire value where the supply
 134                   will notify user-space of the event.
 135
 136                 This is normally used for the charging scenario where
 137                 user-space needs to know if the temperature has crossed an
 138                 upper threshold so it can take appropriate action (e.g. warning
 139                 user that the temperature is critically high, and charging has
 140                 stopped).
 141
 142                 Access: Read
 143
 144                 Valid values: Represented in 1/10 Degrees Celsius
 145
 146 What:           /sys/class/power_supply/<supply_name>/temp_alert_min
 147 Date:           July 2012
 148 Contact:        linux-pm@vger.kernel.org
 149 Description:
 150
 151                 Battery:
 152
 153                   Minimum TBAT temperature trip-wire value where the supply will
 154                   notify user-space of the event.
 155
 156                 USB:
 157
 158                   Minimum supply temperature trip-wire value where the supply
 159                   will notify user-space of the event.
 160
 161                 This is normally used for the charging scenario where user-space
 162                 needs to know if the temperature has crossed a lower threshold
 163                 so it can take appropriate action (e.g. warning user that
 164                 temperature level is high, and charging current has been
 165                 reduced accordingly to remedy the situation).
 166
 167                 Access: Read
 168
 169                 Valid values: Represented in 1/10 Degrees Celsius
 170
 171 What:           /sys/class/power_supply/<supply_name>/temp_max
 172 Date:           July 2014
 173 Contact:        linux-pm@vger.kernel.org
 174 Description:
 175                 Battery:
 176
 177                   Reports the maximum allowed TBAT battery temperature for
 178                   charging.
 179
 180                 USB:
 181
 182                   Reports the maximum allowed supply temperature for operation.
 183
 184                 Access: Read
 185
 186                 Valid values: Represented in 1/10 Degrees Celsius
 187
 188 What:           /sys/class/power_supply/<supply_name>/temp_min
 189 Date:           July 2014
 190 Contact:        linux-pm@vger.kernel.org
 191 Description:
 192                 Battery:
 193
 194                   Reports the minimum allowed TBAT battery temperature for
 195                   charging.
 196
 197                 USB:
 198
 199                   Reports the minimum allowed supply temperature for operation.
 200
 201                 Access: Read
 202
 203                 Valid values: Represented in 1/10 Degrees Celsius
 204
 205 What:           /sys/class/power_supply/<supply_name>/voltage_max,
 206 Date:           January 2008
 207 Contact:        linux-pm@vger.kernel.org
 208 Description:
 209                 Battery:
 210
 211                   Reports the maximum safe VBAT voltage permitted for the
 212                   battery, during charging.
 213
 214                 USB:
 215
 216                   Reports the maximum VBUS voltage the supply can support.
 217
 218                 Access: Read
 219
 220                 Valid values: Represented in microvolts
 221
 222 What:           /sys/class/power_supply/<supply_name>/voltage_min,
 223 Date:           January 2008
 224 Contact:        linux-pm@vger.kernel.org
 225 Description:
 226                 Battery:
 227
 228                   Reports the minimum safe VBAT voltage permitted for the
 229                   battery, during discharging.
 230
 231                 USB:
 232
 233                   Reports the minimum VBUS voltage the supply can support.
 234
 235                 Access: Read
 236
 237                 Valid values: Represented in microvolts
 238
 239 What:           /sys/class/power_supply/<supply_name>/voltage_now,
 240 Date:           May 2007
 241 Contact:        linux-pm@vger.kernel.org
 242 Description:
 243                 Battery:
 244
 245                   Reports an instant, single VBAT voltage reading for the
 246                   battery. This value is not averaged/smoothed.
 247
 248                   Access: Read
 249
 250                 USB:
 251
 252                   Reports the VBUS voltage supplied now. This value is generally
 253                   read-only reporting, unless the 'online' state of the supply
 254                   is set to be programmable, in which case this value can be set
 255                   within the reported min/max range.
 256
 257                   Access: Read, Write
 258
 259                 Valid values: Represented in microvolts
 260
 261 **Battery Properties**
 262
 263 What:           /sys/class/power_supply/<supply_name>/capacity
 264 Date:           May 2007
 265 Contact:        linux-pm@vger.kernel.org
 266 Description:
 267                 Fine grain representation of battery capacity.
 268
 269                 Access: Read
 270
 271                 Valid values: 0 - 100 (percent)
 272
 273 What:           /sys/class/power_supply/<supply_name>/capacity_alert_max
 274 Date:           July 2012
 275 Contact:        linux-pm@vger.kernel.org
 276 Description:
 277                 Maximum battery capacity trip-wire value where the supply will
 278                 notify user-space of the event. This is normally used for the
 279                 battery discharging scenario where user-space needs to know the
 280                 battery has dropped to an upper level so it can take
 281                 appropriate action (e.g. warning user that battery level is
 282                 low).
 283
 284                 Access: Read, Write
 285
 286                 Valid values: 0 - 100 (percent)
 287
 288 What:           /sys/class/power_supply/<supply_name>/capacity_alert_min
 289 Date:           July 2012
 290 Contact:        linux-pm@vger.kernel.org
 291 Description:
 292                 Minimum battery capacity trip-wire value where the supply will
 293                 notify user-space of the event. This is normally used for the
 294                 battery discharging scenario where user-space needs to know the
 295                 battery has dropped to a lower level so it can take
 296                 appropriate action (e.g. warning user that battery level is
 297                 critically low).
 298
 299                 Access: Read, Write
 300
 301                 Valid values: 0 - 100 (percent)
 302
 303 What:           /sys/class/power_supply/<supply_name>/capacity_error_margin
 304 Date:           April 2019
 305 Contact:        linux-pm@vger.kernel.org
 306 Description:
 307                 Battery capacity measurement becomes unreliable without
 308                 recalibration. This values provides the maximum error
 309                 margin expected to exist by the fuel gauge in percent.
 310                 Values close to 0% will be returned after (re-)calibration
 311                 has happened. Over time the error margin will increase.
 312                 100% means, that the capacity related values are basically
 313                 completely useless.
 314
 315                 Access: Read
 316
 317                 Valid values: 0 - 100 (percent)
 318
 319 What:           /sys/class/power_supply/<supply_name>/capacity_level
 320 Date:           June 2009
 321 Contact:        linux-pm@vger.kernel.org
 322 Description:
 323                 Coarse representation of battery capacity.
 324
 325                 Access: Read
 326
 327                 Valid values:
 328                               "Unknown", "Critical", "Low", "Normal", "High",
 329                               "Full"
 330
 331 What:           /sys/class/power_supply/<supply_name>/charge_control_limit
 332 Date:           Oct 2012
 333 Contact:        linux-pm@vger.kernel.org
 334 Description:
 335                 Maximum allowable charging current. Used for charge rate
 336                 throttling for thermal cooling or improving battery health.
 337
 338                 Access: Read, Write
 339
 340                 Valid values: Represented in microamps
 341
 342 What:           /sys/class/power_supply/<supply_name>/charge_control_limit_max
 343 Date:           Oct 2012
 344 Contact:        linux-pm@vger.kernel.org
 345 Description:
 346                 Maximum legal value for the charge_control_limit property.
 347
 348                 Access: Read
 349
 350                 Valid values: Represented in microamps
 351
 352 What:           /sys/class/power_supply/<supply_name>/charge_control_start_threshold
 353 Date:           April 2019
 354 Contact:        linux-pm@vger.kernel.org
 355 Description:
 356                 Represents a battery percentage level, below which charging will
 357                 begin.
 358
 359                 Access: Read, Write
 360                 Valid values: 0 - 100 (percent)
 361
 362 What:           /sys/class/power_supply/<supply_name>/charge_control_end_threshold
 363 Date:           April 2019
 364 Contact:        linux-pm@vger.kernel.org
 365 Description:
 366                 Represents a battery percentage level, above which charging will
 367                 stop. Not all hardware is capable of setting this to an arbitrary
 368                 percentage. Drivers will round written values to the nearest
 369                 supported value. Reading back the value will show the actual
 370                 threshold set by the driver.
 371
 372                 Access: Read, Write
 373
 374                 Valid values: 0 - 100 (percent)
 375
 376 What:           /sys/class/power_supply/<supply_name>/charge_type
 377 Date:           July 2009
 378 Contact:        linux-pm@vger.kernel.org
 379 Description:
 380                 Select the charging algorithm to use for a battery.
 381
 382                 Standard:
 383                         Fully charge the battery at a moderate rate.
 384                 Fast:
 385                         Quickly charge the battery using fast-charge
 386                         technology. This is typically harder on the battery
 387                         than standard charging and may lower its lifespan.
 388                 Trickle:
 389                         Users who primarily operate the system while
 390                         plugged into an external power source can extend
 391                         battery life with this mode. Vendor tooling may
 392                         call this "Primarily AC Use".
 393                 Adaptive:
 394                         Automatically optimize battery charge rate based
 395                         on typical usage pattern.
 396                 Custom:
 397                         Use the charge_control_* properties to determine
 398                         when to start and stop charging. Advanced users
 399                         can use this to drastically extend battery life.
 400                 Long Life:
 401                         The charger reduces its charging rate in order to
 402                         prolong the battery health.
 403                 Bypass:
 404                         The charger bypasses the charging path around the
 405                         integrated converter allowing for a "smart" wall
 406                         adaptor to perform the power conversion externally.
 407
 408                 Access: Read, Write
 409
 410                 Valid values:
 411                               "Unknown", "N/A", "Trickle", "Fast", "Standard",
 412                               "Adaptive", "Custom", "Long Life", "Bypass"
 413
 414 What:           /sys/class/power_supply/<supply_name>/charge_term_current
 415 Date:           July 2014
 416 Contact:        linux-pm@vger.kernel.org
 417 Description:
 418                 Reports the charging current value which is used to determine
 419                 when the battery is considered full and charging should end.
 420
 421                 Access: Read
 422
 423                 Valid values: Represented in microamps
 424
 425 What:           /sys/class/power_supply/<supply_name>/health
 426 Date:           May 2007
 427 Contact:        linux-pm@vger.kernel.org
 428 Description:
 429                 Reports the health of the battery or battery side of charger
 430                 functionality.
 431
 432                 Access: Read
 433
 434                 Valid values:
 435                               "Unknown", "Good", "Overheat", "Dead",
 436                               "Over voltage", "Unspecified failure", "Cold",
 437                               "Watchdog timer expire", "Safety timer expire",
 438                               "Over current", "Calibration required", "Warm",
 439                               "Cool", "Hot", "No battery"
 440
 441 What:           /sys/class/power_supply/<supply_name>/precharge_current
 442 Date:           June 2017
 443 Contact:        linux-pm@vger.kernel.org
 444 Description:
 445                 Reports the charging current applied during pre-charging phase
 446                 for a battery charge cycle.
 447
 448                 Access: Read
 449
 450                 Valid values: Represented in microamps
 451
 452 What:           /sys/class/power_supply/<supply_name>/present
 453 Date:           May 2007
 454 Contact:        linux-pm@vger.kernel.org
 455 Description:
 456                 Reports whether a battery is present or not in the system. If the
 457                 property does not exist, the battery is considered to be present.
 458
 459                 Access: Read
 460
 461                 Valid values:
 462
 463                         == =======
 464                         0: Absent
 465                         1: Present
 466                         == =======
 467
 468 What:           /sys/class/power_supply/<supply_name>/status
 469 Date:           May 2007
 470 Contact:        linux-pm@vger.kernel.org
 471 Description:
 472                 Represents the charging status of the battery. Normally this
 473                 is read-only reporting although for some supplies this can be
 474                 used to enable/disable charging to the battery.
 475
 476                 Access: Read, Write
 477
 478                 Valid values:
 479                               "Unknown", "Charging", "Discharging",
 480                               "Not charging", "Full"
 481
 482 What:           /sys/class/power_supply/<supply_name>/charge_behaviour
 483 Date:           November 2021
 484 Contact:        linux-pm@vger.kernel.org
 485 Description:
 486                 Represents the charging behaviour.
 487
 488                 Access: Read, Write
 489
 490                 Valid values:
 491                         ================ ====================================
 492                         auto:            Charge normally, respect thresholds
 493                         inhibit-charge:  Do not charge while AC is attached
 494                         force-discharge: Force discharge while AC is attached
 495                         ================ ====================================
 496
 497 What:           /sys/class/power_supply/<supply_name>/technology
 498 Date:           May 2007
 499 Contact:        linux-pm@vger.kernel.org
 500 Description:
 501                 Describes the battery technology supported by the supply.
 502
 503                 Access: Read
 504
 505                 Valid values:
 506                               "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe",
 507                               "NiCd", "LiMn"
 508
 509
 510 What:           /sys/class/power_supply/<supply_name>/voltage_avg,
 511 Date:           May 2007
 512 Contact:        linux-pm@vger.kernel.org
 513 Description:
 514                 Reports an average VBAT voltage reading for the battery, over a
 515                 fixed period. Normally devices will provide a fixed interval in
 516                 which they average readings to smooth out the reported value.
 517
 518                 Access: Read
 519
 520                 Valid values: Represented in microvolts
 521
 522 What:           /sys/class/power_supply/<supply_name>/cycle_count
 523 Date:           January 2010
 524 Contact:        linux-pm@vger.kernel.org
 525 Description:
 526                 Reports the number of full charge + discharge cycles the
 527                 battery has undergone.
 528
 529                 Access: Read
 530
 531                 Valid values:
 532                         Integer > 0: representing full cycles
 533                         Integer = 0: cycle_count info is not available
 534
 535 **USB Properties**
 536
 537 What:           /sys/class/power_supply/<supply_name>/input_current_limit
 538 Date:           July 2014
 539 Contact:        linux-pm@vger.kernel.org
 540 Description:
 541                 Details the incoming IBUS current limit currently set in the
 542                 supply. Normally this is configured based on the type of
 543                 connection made (e.g. A configured SDP should output a maximum
 544                 of 500mA so the input current limit is set to the same value).
 545                 Use preferably input_power_limit, and for problems that can be
 546                 solved using power limit use input_current_limit.
 547
 548                 Access: Read, Write
 549
 550                 Valid values: Represented in microamps
 551
 552 What:           /sys/class/power_supply/<supply_name>/input_voltage_limit
 553 Date:           May 2019
 554 Contact:        linux-pm@vger.kernel.org
 555 Description:
 556                 This entry configures the incoming VBUS voltage limit currently
 557                 set in the supply. Normally this is configured based on
 558                 system-level knowledge or user input (e.g. This is part of the
 559                 Pixel C's thermal management strategy to effectively limit the
 560                 input power to 5V when the screen is on to meet Google's skin
 561                 temperature targets). Note that this feature should not be
 562                 used for safety critical things.
 563                 Use preferably input_power_limit, and for problems that can be
 564                 solved using power limit use input_voltage_limit.
 565
 566                 Access: Read, Write
 567
 568                 Valid values: Represented in microvolts
 569
 570 What:           /sys/class/power_supply/<supply_name>/input_power_limit
 571 Date:           May 2019
 572 Contact:        linux-pm@vger.kernel.org
 573 Description:
 574                 This entry configures the incoming power limit currently set
 575                 in the supply. Normally this is configured based on
 576                 system-level knowledge or user input. Use preferably this
 577                 feature to limit the incoming power and use current/voltage
 578                 limit only for problems that can be solved using power limit.
 579
 580                 Access: Read, Write
 581
 582                 Valid values: Represented in microwatts
 583
 584 What:           /sys/class/power_supply/<supply_name>/online,
 585 Date:           May 2007
 586 Contact:        linux-pm@vger.kernel.org
 587 Description:
 588                 Indicates if VBUS is present for the supply. When the supply is
 589                 online, and the supply allows it, then it's possible to switch
 590                 between online states (e.g. Fixed -> Programmable for a PD_PPS
 591                 USB supply so voltage and current can be controlled).
 592
 593                 Access: Read, Write
 594
 595                 Valid values:
 596
 597                         == ==================================================
 598                         0: Offline
 599                         1: Online Fixed - Fixed Voltage Supply
 600                         2: Online Programmable - Programmable Voltage Supply
 601                         == ==================================================
 602
 603 What:           /sys/class/power_supply/<supply_name>/usb_type
 604 Date:           March 2018
 605 Contact:        linux-pm@vger.kernel.org
 606 Description:
 607                 Reports what type of USB connection is currently active for
 608                 the supply, for example it can show if USB-PD capable source
 609                 is attached.
 610
 611                 Access: For power-supplies which consume USB power such
 612                 as battery charger chips, this indicates the type of
 613                 the connected USB power source and is Read-Only.
 614
 615                 For power-supplies which act as a USB power-source such as
 616                 e.g. the UCS1002 USB Port Power Controller this is writable.
 617
 618                 Valid values:
 619                               "Unknown", "SDP", "DCP", "CDP", "ACA", "C", "PD",
 620                               "PD_DRP", "PD_PPS", "BrickID"
 621
 622 **Device Specific Properties**
 623
 624 What:           /sys/class/power/ds2760-battery.*/charge_now
 625 Date:           May 2010
 626 KernelVersion:  2.6.35
 627 Contact:        Daniel Mack <daniel@caiaq.de>
 628 Description:
 629                 This file is writeable and can be used to set the current
 630                 coloumb counter value inside the battery monitor chip. This
 631                 is needed for unavoidable corrections of aging batteries.
 632                 A userspace daemon can monitor the battery charging logic
 633                 and once the counter drops out of considerable bounds, take
 634                 appropriate action.
 635
 636 What:           /sys/class/power/ds2760-battery.*/charge_full
 637 Date:           May 2010
 638 KernelVersion:  2.6.35
 639 Contact:        Daniel Mack <daniel@caiaq.de>
 640 Description:
 641                 This file is writeable and can be used to set the assumed
 642                 battery 'full level'. As batteries age, this value has to be
 643                 amended over time.
 644
 645 What:           /sys/class/power_supply/max14577-charger/device/fast_charge_timer
 646 Date:           October 2014
 647 KernelVersion:  3.18.0
 648 Contact:        Krzysztof Kozlowski <krzk@kernel.org>
 649 Description:
 650                 This entry shows and sets the maximum time the max14577
 651                 charger operates in fast-charge mode. When the timer expires
 652                 the device will terminate fast-charge mode (charging current
 653                 will drop to 0 A) and will trigger interrupt.
 654
 655                 Valid values:
 656
 657                 - 5, 6 or 7 (hours),
 658                 - 0: disabled.
 659
 660 What:           /sys/class/power_supply/max77693-charger/device/fast_charge_timer
 661 Date:           January 2015
 662 KernelVersion:  3.19.0
 663 Contact:        Krzysztof Kozlowski <krzk@kernel.org>
 664 Description:
 665                 This entry shows and sets the maximum time the max77693
 666                 charger operates in fast-charge mode. When the timer expires
 667                 the device will terminate fast-charge mode (charging current
 668                 will drop to 0 A) and will trigger interrupt.
 669
 670                 Valid values:
 671
 672                 - 4 - 16 (hours), step by 2 (rounded down)
 673                 - 0: disabled.
 674
 675 What:           /sys/class/power_supply/max77693-charger/device/top_off_threshold_current
 676 Date:           January 2015
 677 KernelVersion:  3.19.0
 678 Contact:        Krzysztof Kozlowski <krzk@kernel.org>
 679 Description:
 680                 This entry shows and sets the charging current threshold for
 681                 entering top-off charging mode. When charging current in fast
 682                 charge mode drops below this value, the charger will trigger
 683                 interrupt and start top-off charging mode.
 684
 685                 Valid values:
 686
 687                 - 100000 - 200000 (microamps), step by 25000 (rounded down)
 688                 - 200000 - 350000 (microamps), step by 50000 (rounded down)
 689                 - 0: disabled.
 690
 691 What:           /sys/class/power_supply/max77693-charger/device/top_off_timer
 692 Date:           January 2015
 693 KernelVersion:  3.19.0
 694 Contact:        Krzysztof Kozlowski <krzk@kernel.org>
 695 Description:
 696                 This entry shows and sets the maximum time the max77693
 697                 charger operates in top-off charge mode. When the timer expires
 698                 the device will terminate top-off charge mode (charging current
 699                 will drop to 0 A) and will trigger interrupt.
 700
 701                 Valid values:
 702
 703                 - 0 - 70 (minutes), step by 10 (rounded down)
 704
 705 What:           /sys/class/power_supply/bq24257-charger/ovp_voltage
 706 Date:           October 2015
 707 KernelVersion:  4.4.0
 708 Contact:        Andreas Dannenberg <dannenberg@ti.com>
 709 Description:
 710                 This entry configures the overvoltage protection feature of bq24257-
 711                 type charger devices. This feature protects the device and other
 712                 components against damage from overvoltage on the input supply. See
 713                 device datasheet for details.
 714
 715                 Valid values:
 716
 717                 - 6000000, 6500000, 7000000, 8000000, 9000000, 9500000, 10000000,
 718                   10500000 (all uV)
 719
 720 What:           /sys/class/power_supply/bq24257-charger/in_dpm_voltage
 721 Date:           October 2015
 722 KernelVersion:  4.4.0
 723 Contact:        Andreas Dannenberg <dannenberg@ti.com>
 724 Description:
 725                 This entry configures the input dynamic power path management voltage of
 726                 bq24257-type charger devices. Once the supply drops to the configured
 727                 voltage, the input current limit is reduced down to prevent the further
 728                 drop of the supply. When the IC enters this mode, the charge current is
 729                 lower than the set value. See device datasheet for details.
 730
 731                 Valid values:
 732
 733                 - 4200000, 4280000, 4360000, 4440000, 4520000, 4600000, 4680000,
 734                   4760000 (all uV)
 735
 736 What:           /sys/class/power_supply/bq24257-charger/high_impedance_enable
 737 Date:           October 2015
 738 KernelVersion:  4.4.0
 739 Contact:        Andreas Dannenberg <dannenberg@ti.com>
 740 Description:
 741                 This entry allows enabling the high-impedance mode of bq24257-type
 742                 charger devices. If enabled, it places the charger IC into low power
 743                 standby mode with the switch mode controller disabled. When disabled,
 744                 the charger operates normally. See device datasheet for details.
 745
 746                 Valid values:
 747
 748                 - 1: enabled
 749                 - 0: disabled
 750
 751 What:           /sys/class/power_supply/bq24257-charger/sysoff_enable
 752 Date:           October 2015
 753 KernelVersion:  4.4.0
 754 Contact:        Andreas Dannenberg <dannenberg@ti.com>
 755 Description:
 756                 This entry allows enabling the sysoff mode of bq24257-type charger
 757                 devices. If enabled and the input is removed, the internal battery FET
 758                 is turned off in order to reduce the leakage from the BAT pin to less
 759                 than 1uA. Note that on some devices/systems this disconnects the battery
 760                 from the system. See device datasheet for details.
 761
 762                 Valid values:
 763
 764                 - 1: enabled
 765                 - 0: disabled
 766
 767 What:           /sys/class/power_supply/<supply_name>/manufacture_year
 768 Date:           January 2020
 769 Contact:        linux-pm@vger.kernel.org
 770 Description:
 771                 Reports the year (following Gregorian calendar) when the device has been
 772                 manufactured.
 773
 774                 Access: Read
 775
 776                 Valid values: Reported as integer
 777
 778 What:           /sys/class/power_supply/<supply_name>/manufacture_month
 779 Date:           January 2020
 780 Contact:        linux-pm@vger.kernel.org
 781 Description:
 782                 Reports the month when the device has been manufactured.
 783
 784                 Access: Read
 785
 786                 Valid values: 1-12
 787
 788 What:           /sys/class/power_supply/<supply_name>/manufacture_day
 789 Date:           January 2020
 790 Contact:        linux-pm@vger.kernel.org
 791 Description:
 792                 Reports the day of month when the device has been manufactured.
 793
 794                 Access: Read
 795                 Valid values: 1-31