linux/Documentation/hwmon/surface_fan.rst
Ivor Wanders d612bf839f hwmon: add fan speed monitoring driver for Surface devices
Adds a driver that provides read only access to the fan speed for Microsoft
Surface Pro devices. The fan speed is always regulated by the EC and cannot
be influenced directly.

Signed-off-by: Ivor Wanders <ivor@iwanders.net>
Link: https://github.com/linux-surface/kernel/pull/144
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com>
Reviewed-by: Armin Wolf <W_Armin@gmx.de>
Link: https://lore.kernel.org/r/20240131005856.10180-2-ivor@iwanders.net
[groeck:
 - Declare surface_fan_hwmon_is_visible() static
 - Add dependency on SURFACE_AGGREGATOR_BUS
]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2024-02-25 12:37:36 -08:00

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.. SPDX-License-Identifier: GPL-2.0-or-later
Kernel driver surface_fan
=========================
Supported Devices:
* Microsoft Surface Pro 9
Author: Ivor Wanders <ivor@iwanders.net>
Description
-----------
This provides monitoring of the fan found in some Microsoft Surface Pro devices,
like the Surface Pro 9. The fan is always controlled by the onboard controller.
Sysfs interface
---------------
======================= ======= =========================================
Name Perm Description
======================= ======= =========================================
``fan1_input`` RO Current fan speed in RPM.
======================= ======= =========================================