Kernel driver gpd-fan

Author:

Description

Handheld devices from Shenzhen GPD Technology Co., Ltd. provide fan readings and fan control through their embedded controllers.

Supported devices

Currently the driver supports the following handhelds:

  • GPD Win Mini (7840U)

  • GPD Win Mini (8840U)

  • GPD Win Mini (HX370)

  • GPD Pocket 4

  • GPD Duo

  • GPD Win Max 2 (6800U)

  • GPD Win Max 2 2023 (7840U)

  • GPD Win Max 2 2024 (8840U)

  • GPD Win Max 2 2025 (HX370)

  • GPD Win 4 (6800U)

  • GPD Win 4 (7840U)

Module parameters

gpd_fan_board

Force specific which module quirk should be used. Use it like “gpd_fan_board=wm2”.

  • wm2

    • GPD Win 4 (7840U)

    • GPD Win Max 2 (6800U)

    • GPD Win Max 2 2023 (7840U)

    • GPD Win Max 2 2024 (8840U)

    • GPD Win Max 2 2025 (HX370)

  • win4

    • GPD Win 4 (6800U)

  • win_mini

    • GPD Win Mini (7840U)

    • GPD Win Mini (8840U)

    • GPD Win Mini (HX370)

    • GPD Pocket 4

    • GPD Duo

Sysfs entries

The following attributes are supported:

fan1_input

Read Only. Reads current fan RPM.

pwm1_enable

Read/Write. Enable manual fan control. Write “0” to disable control and run at full speed. Write “1” to set to manual, write “2” to let the EC control decide fan speed. Read this attribute to see current status.

NB：In consideration of the safety of the device, when setting to manual mode, the pwm speed will be set to the maximum value (255) by default. You can set a different value by writing pwm1 later.

pwm1

Read/Write. Read this attribute to see current duty cycle in the range [0-255]. When pwm1_enable is set to “1” (manual) write any value in the range [0-255] to set fan speed.

NB: Many boards (except listed under wm2 above) don’t support reading the current pwm value in auto mode. That will just return EOPNOTSUPP. In manual mode it will always return the real value.