| .. SPDX-License-Identifier: GPL-2.0-or-later |
| |
| Kernel driver gpd-fan |
| ========================= |
| |
| Author: |
| - Cryolitia PukNgae <cryolitia@uniontech.com> |
| |
| 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. |
