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.
 368
 369                 Access: Read, Write
 370
 371                 Valid values: 0 - 100 (percent)
 372
 373 What:           /sys/class/power_supply/<supply_name>/charge_type
 374 Date:           July 2009
 375 Contact:        linux-pm@vger.kernel.org
 376 Description:
 377                 Represents the type of charging currently being applied to the
 378                 battery. "Trickle", "Fast", and "Standard" all mean different
 379                 charging speeds. "Adaptive" means that the charger uses some
 380                 algorithm to adjust the charge rate dynamically, without
 381                 any user configuration required. "Custom" means that the charger
 382                 uses the charge_control_* properties as configuration for some
 383                 different algorithm.
 384
 385                 Access: Read, Write
 386
 387                 Valid values:
 388                               "Unknown", "N/A", "Trickle", "Fast", "Standard",
 389                               "Adaptive", "Custom"
 390
 391 What:           /sys/class/power_supply/<supply_name>/charge_term_current
 392 Date:           July 2014
 393 Contact:        linux-pm@vger.kernel.org
 394 Description:
 395                 Reports the charging current value which is used to determine
 396                 when the battery is considered full and charging should end.
 397
 398                 Access: Read
 399
 400                 Valid values: Represented in microamps
 401
 402 What:           /sys/class/power_supply/<supply_name>/health
 403 Date:           May 2007
 404 Contact:        linux-pm@vger.kernel.org
 405 Description:
 406                 Reports the health of the battery or battery side of charger
 407                 functionality.
 408
 409                 Access: Read
 410
 411                 Valid values:
 412                               "Unknown", "Good", "Overheat", "Dead",
 413                               "Over voltage", "Unspecified failure", "Cold",
 414                               "Watchdog timer expire", "Safety timer expire",
 415                               "Over current", "Calibration required", "Warm",
 416                               "Cool", "Hot"
 417
 418 What:           /sys/class/power_supply/<supply_name>/precharge_current
 419 Date:           June 2017
 420 Contact:        linux-pm@vger.kernel.org
 421 Description:
 422                 Reports the charging current applied during pre-charging phase
 423                 for a battery charge cycle.
 424
 425                 Access: Read
 426
 427                 Valid values: Represented in microamps
 428
 429 What:           /sys/class/power_supply/<supply_name>/present
 430 Date:           May 2007
 431 Contact:        linux-pm@vger.kernel.org
 432 Description:
 433                 Reports whether a battery is present or not in the system.
 434
 435                 Access: Read
 436
 437                 Valid values:
 438
 439                         == =======
 440                         0: Absent
 441                         1: Present
 442                         == =======
 443
 444 What:           /sys/class/power_supply/<supply_name>/status
 445 Date:           May 2007
 446 Contact:        linux-pm@vger.kernel.org
 447 Description:
 448                 Represents the charging status of the battery. Normally this
 449                 is read-only reporting although for some supplies this can be
 450                 used to enable/disable charging to the battery.
 451
 452                 Access: Read, Write
 453
 454                 Valid values:
 455                               "Unknown", "Charging", "Discharging",
 456                               "Not charging", "Full"
 457
 458 What:           /sys/class/power_supply/<supply_name>/technology
 459 Date:           May 2007
 460 Contact:        linux-pm@vger.kernel.org
 461 Description:
 462                 Describes the battery technology supported by the supply.
 463
 464                 Access: Read
 465
 466                 Valid values:
 467                               "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe",
 468                               "NiCd", "LiMn"
 469
 470
 471 What:           /sys/class/power_supply/<supply_name>/voltage_avg,
 472 Date:           May 2007
 473 Contact:        linux-pm@vger.kernel.org
 474 Description:
 475                 Reports an average VBAT voltage reading for the battery, over a
 476                 fixed period. Normally devices will provide a fixed interval in
 477                 which they average readings to smooth out the reported value.
 478
 479                 Access: Read
 480
 481                 Valid values: Represented in microvolts
 482
 483 **USB Properties**
 484
 485 What:           /sys/class/power_supply/<supply_name>/input_current_limit
 486 Date:           July 2014
 487 Contact:        linux-pm@vger.kernel.org
 488 Description:
 489                 Details the incoming IBUS current limit currently set in the
 490                 supply. Normally this is configured based on the type of
 491                 connection made (e.g. A configured SDP should output a maximum
 492                 of 500mA so the input current limit is set to the same value).
 493                 Use preferably input_power_limit, and for problems that can be
 494                 solved using power limit use input_current_limit.
 495
 496                 Access: Read, Write
 497
 498                 Valid values: Represented in microamps
 499
 500 What:           /sys/class/power_supply/<supply_name>/input_voltage_limit
 501 Date:           May 2019
 502 Contact:        linux-pm@vger.kernel.org
 503 Description:
 504                 This entry configures the incoming VBUS voltage limit currently
 505                 set in the supply. Normally this is configured based on
 506                 system-level knowledge or user input (e.g. This is part of the
 507                 Pixel C's thermal management strategy to effectively limit the
 508                 input power to 5V when the screen is on to meet Google's skin
 509                 temperature targets). Note that this feature should not be
 510                 used for safety critical things.
 511                 Use preferably input_power_limit, and for problems that can be
 512                 solved using power limit use input_voltage_limit.
 513
 514                 Access: Read, Write
 515
 516                 Valid values: Represented in microvolts
 517
 518 What:           /sys/class/power_supply/<supply_name>/input_power_limit
 519 Date:           May 2019
 520 Contact:        linux-pm@vger.kernel.org
 521 Description:
 522                 This entry configures the incoming power limit currently set
 523                 in the supply. Normally this is configured based on
 524                 system-level knowledge or user input. Use preferably this
 525                 feature to limit the incoming power and use current/voltage
 526                 limit only for problems that can be solved using power limit.
 527
 528                 Access: Read, Write
 529
 530                 Valid values: Represented in microwatts
 531
 532 What:           /sys/class/power_supply/<supply_name>/online,
 533 Date:           May 2007
 534 Contact:        linux-pm@vger.kernel.org
 535 Description:
 536                 Indicates if VBUS is present for the supply. When the supply is
 537                 online, and the supply allows it, then it's possible to switch
 538                 between online states (e.g. Fixed -> Programmable for a PD_PPS
 539                 USB supply so voltage and current can be controlled).
 540
 541                 Access: Read, Write
 542
 543                 Valid values:
 544
 545                         == ==================================================
 546                         0: Offline
 547                         1: Online Fixed - Fixed Voltage Supply
 548                         2: Online Programmable - Programmable Voltage Supply
 549                         == ==================================================
 550
 551 What:           /sys/class/power_supply/<supply_name>/usb_type
 552 Date:           March 2018
 553 Contact:        linux-pm@vger.kernel.org
 554 Description:
 555                 Reports what type of USB connection is currently active for
 556                 the supply, for example it can show if USB-PD capable source
 557                 is attached.
 558
 559                 Access: Read-Only
 560
 561                 Valid values:
 562                               "Unknown", "SDP", "DCP", "CDP", "ACA", "C", "PD",
 563                               "PD_DRP", "PD_PPS", "BrickID"
 564
 565 **Device Specific Properties**
 566
 567 What:           /sys/class/power/ds2760-battery.*/charge_now
 568 Date:           May 2010
 569 KernelVersion:  2.6.35
 570 Contact:        Daniel Mack <daniel@caiaq.de>
 571 Description:
 572                 This file is writeable and can be used to set the current
 573                 coloumb counter value inside the battery monitor chip. This
 574                 is needed for unavoidable corrections of aging batteries.
 575                 A userspace daemon can monitor the battery charging logic
 576                 and once the counter drops out of considerable bounds, take
 577                 appropriate action.
 578
 579 What:           /sys/class/power/ds2760-battery.*/charge_full
 580 Date:           May 2010
 581 KernelVersion:  2.6.35
 582 Contact:        Daniel Mack <daniel@caiaq.de>
 583 Description:
 584                 This file is writeable and can be used to set the assumed
 585                 battery 'full level'. As batteries age, this value has to be
 586                 amended over time.
 587
 588 What:           /sys/class/power_supply/max14577-charger/device/fast_charge_timer
 589 Date:           October 2014
 590 KernelVersion:  3.18.0
 591 Contact:        Krzysztof Kozlowski <krzk@kernel.org>
 592 Description:
 593                 This entry shows and sets the maximum time the max14577
 594                 charger operates in fast-charge mode. When the timer expires
 595                 the device will terminate fast-charge mode (charging current
 596                 will drop to 0 A) and will trigger interrupt.
 597
 598                 Valid values:
 599
 600                 - 5, 6 or 7 (hours),
 601                 - 0: disabled.
 602
 603 What:           /sys/class/power_supply/max77693-charger/device/fast_charge_timer
 604 Date:           January 2015
 605 KernelVersion:  3.19.0
 606 Contact:        Krzysztof Kozlowski <krzk@kernel.org>
 607 Description:
 608                 This entry shows and sets the maximum time the max77693
 609                 charger operates in fast-charge mode. When the timer expires
 610                 the device will terminate fast-charge mode (charging current
 611                 will drop to 0 A) and will trigger interrupt.
 612
 613                 Valid values:
 614
 615                 - 4 - 16 (hours), step by 2 (rounded down)
 616                 - 0: disabled.
 617
 618 What:           /sys/class/power_supply/max77693-charger/device/top_off_threshold_current
 619 Date:           January 2015
 620 KernelVersion:  3.19.0
 621 Contact:        Krzysztof Kozlowski <krzk@kernel.org>
 622 Description:
 623                 This entry shows and sets the charging current threshold for
 624                 entering top-off charging mode. When charging current in fast
 625                 charge mode drops below this value, the charger will trigger
 626                 interrupt and start top-off charging mode.
 627
 628                 Valid values:
 629
 630                 - 100000 - 200000 (microamps), step by 25000 (rounded down)
 631                 - 200000 - 350000 (microamps), step by 50000 (rounded down)
 632                 - 0: disabled.
 633
 634 What:           /sys/class/power_supply/max77693-charger/device/top_off_timer
 635 Date:           January 2015
 636 KernelVersion:  3.19.0
 637 Contact:        Krzysztof Kozlowski <krzk@kernel.org>
 638 Description:
 639                 This entry shows and sets the maximum time the max77693
 640                 charger operates in top-off charge mode. When the timer expires
 641                 the device will terminate top-off charge mode (charging current
 642                 will drop to 0 A) and will trigger interrupt.
 643
 644                 Valid values:
 645
 646                 - 0 - 70 (minutes), step by 10 (rounded down)
 647
 648 What:           /sys/class/power_supply/bq24257-charger/ovp_voltage
 649 Date:           October 2015
 650 KernelVersion:  4.4.0
 651 Contact:        Andreas Dannenberg <dannenberg@ti.com>
 652 Description:
 653                 This entry configures the overvoltage protection feature of bq24257-
 654                 type charger devices. This feature protects the device and other
 655                 components against damage from overvoltage on the input supply. See
 656                 device datasheet for details.
 657
 658                 Valid values:
 659
 660                 - 6000000, 6500000, 7000000, 8000000, 9000000, 9500000, 10000000,
 661                   10500000 (all uV)
 662
 663 What:           /sys/class/power_supply/bq24257-charger/in_dpm_voltage
 664 Date:           October 2015
 665 KernelVersion:  4.4.0
 666 Contact:        Andreas Dannenberg <dannenberg@ti.com>
 667 Description:
 668                 This entry configures the input dynamic power path management voltage of
 669                 bq24257-type charger devices. Once the supply drops to the configured
 670                 voltage, the input current limit is reduced down to prevent the further
 671                 drop of the supply. When the IC enters this mode, the charge current is
 672                 lower than the set value. See device datasheet for details.
 673
 674                 Valid values:
 675
 676                 - 4200000, 4280000, 4360000, 4440000, 4520000, 4600000, 4680000,
 677                   4760000 (all uV)
 678
 679 What:           /sys/class/power_supply/bq24257-charger/high_impedance_enable
 680 Date:           October 2015
 681 KernelVersion:  4.4.0
 682 Contact:        Andreas Dannenberg <dannenberg@ti.com>
 683 Description:
 684                 This entry allows enabling the high-impedance mode of bq24257-type
 685                 charger devices. If enabled, it places the charger IC into low power
 686                 standby mode with the switch mode controller disabled. When disabled,
 687                 the charger operates normally. See device datasheet for details.
 688
 689                 Valid values:
 690
 691                 - 1: enabled
 692                 - 0: disabled
 693
 694 What:           /sys/class/power_supply/bq24257-charger/sysoff_enable
 695 Date:           October 2015
 696 KernelVersion:  4.4.0
 697 Contact:        Andreas Dannenberg <dannenberg@ti.com>
 698 Description:
 699                 This entry allows enabling the sysoff mode of bq24257-type charger
 700                 devices. If enabled and the input is removed, the internal battery FET
 701                 is turned off in order to reduce the leakage from the BAT pin to less
 702                 than 1uA. Note that on some devices/systems this disconnects the battery
 703                 from the system. See device datasheet for details.
 704
 705                 Valid values:
 706
 707                 - 1: enabled
 708                 - 0: disabled
 709
 710 What:           /sys/class/power_supply/<supply_name>/manufacture_year
 711 Date:           January 2020
 712 Contact:        linux-pm@vger.kernel.org
 713 Description:
 714                 Reports the year (following Gregorian calendar) when the device has been
 715                 manufactured.
 716
 717                 Access: Read
 718
 719                 Valid values: Reported as integer
 720
 721 What:           /sys/class/power_supply/<supply_name>/manufacture_month
 722 Date:           January 2020
 723 Contact:        linux-pm@vger.kernel.org
 724 Description:
 725                 Reports the month when the device has been manufactured.
 726
 727                 Access: Read
 728
 729                 Valid values: 1-12
 730
 731 What:           /sys/class/power_supply/<supply_name>/manufacture_day
 732 Date:           January 2020
 733 Contact:        linux-pm@vger.kernel.org
 734 Description:
 735                 Reports the day of month when the device has been manufactured.
 736
 737                 Access: Read
 738                 Valid values: 1-31