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.. SPDX-License-Identifier: GPL-2.0-only
Kernel driver macsmc-hwmon
==========================
Supported hardware
* Apple Silicon Macs (M1 and up)
Author: James Calligeros <jcalligeros99@gmail.com>
Description
-----------
macsmc-hwmon exposes the Apple System Management controller's
temperature, voltage, current and power sensors, as well as
fan speed and control capabilities, via hwmon.
Because each Apple Silicon Mac exposes a different set of sensors
(e.g. the MacBooks expose battery telemetry that is not present on
the desktop Macs), sensors present on any given machine are described
via Devicetree. The driver picks these up and registers them with
hwmon when probed.
Manual fan speed is supported via the fan_control module parameter. This
is disabled by default and marked as unsafe, as it cannot be proven that
the system will fail safe if overheating due to manual fan control being
used.
sysfs interface
---------------
currX_input
Ammeter value
currX_label
Ammeter label
fanX_input
Current fan speed
fanX_label
Fan label
fanX_min
Minimum possible fan speed
fanX_max
Maximum possible fan speed
fanX_target
Current fan setpoint
inX_input
Voltmeter value
inX_label
Voltmeter label
powerX_input
Power meter value
powerX_label
Power meter label
tempX_input
Temperature sensor value
tempX_label
Temperature sensor label
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