linux-kernel - Thermal driver with safeguards

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Message-ID: <41483e2b-361b-4b84-88a7-24fc1eaae745@tuxedocomputers.com>
Date: Mon, 2 Dec 2024 15:52:43 +0100
From: Werner Sembach <wse@...edocomputers.com>
To: "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
 "Rafael J . Wysocki" <rafael@...nel.org>
Cc: rui.zhang@...el.com, Hans de Goede <hdegoede@...hat.com>,
 Armin Wolf <W_Armin@....de>, Ilpo Järvinen
 <ilpo.jarvinen@...ux.intel.com>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 platform-driver-x86@...r.kernel.org
Subject: Thermal driver with safeguards

Hi,

given a pair of a temperature sensor and a fan, I want to implement a driver. 
that allows userspace to directly control the fan if it wants to. But have a 
minimum fan speed when certain high temperatures are reached to avoid crashes or 
hardware damage.

e.g.

- temperature of target die is 80°C -> fan speed must be at least 30%

- temperature of target die is 90°C -> fan speed must be at least 40%

- temperature of target die is 105°C -> fan speed must be 100%

- temperature of target die is 110°C -> device shuts off to protect the hardware

Would the thermal subsystem be the right place for this to implement this 
protection in driver?

It already has functions around periodic temperature polling and trip points.

Kind regards,

Werner Sembach