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linux-next/Documentation/hwmon/nzxt-kraken2.rst
Jonas Malaco 82e3430dfa hwmon: add driver for NZXT Kraken X42/X52/X62/X72
These are "all-in-one" CPU liquid coolers that can be monitored and
controlled through a proprietary USB HID protocol.

While the models have differently sized radiators and come with varying
numbers of fans, they are all indistinguishable at the software level.

The driver exposes fan/pump speeds and coolant temperature through the
standard hwmon sysfs interface.

Fan and pump control, while supported by the devices, are not currently
exposed.  The firmware accepts up to 61 trip points per channel
(fan/pump), but the same set of trip temperatures has to be maintained
for both; with pwmX_auto_point_Y_temp attributes, users would need to
maintain this invariant themselves.

Instead, fan and pump control, as well as LED control (which the device
also supports for 9 addressable RGB LEDs on the CPU water block) are
left for existing and already mature user-space tools, which can still
be used alongside the driver, thanks to hidraw.  A link to one, which I
also maintain, is provided in the documentation.

The implementation is based on USB traffic analysis.  It has been
runtime tested on x86_64, both as a built-in driver and as a module.

Signed-off-by: Jonas Malaco <jonas@protocubo.io>
Link: https://lore.kernel.org/r/20210319045544.416138-1-jonas@protocubo.io
[groeck: Removed unnecessary spinlock.h include]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2021-04-20 06:50:14 -07:00

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.. SPDX-License-Identifier: GPL-2.0-or-later
Kernel driver nzxt-kraken2
==========================
Supported devices:
* NZXT Kraken X42
* NZXT Kraken X52
* NZXT Kraken X62
* NZXT Kraken X72
Author: Jonas Malaco
Description
-----------
This driver enables hardware monitoring support for NZXT Kraken X42/X52/X62/X72
all-in-one CPU liquid coolers. Three sensors are available: fan speed, pump
speed and coolant temperature.
Fan and pump control, while supported by the firmware, are not currently
exposed. The addressable RGB LEDs, present in the integrated CPU water block
and pump head, are not supported either. But both features can be found in
existing user-space tools (e.g. `liquidctl`_).
.. _liquidctl: https://github.com/liquidctl/liquidctl
Usage Notes
-----------
As these are USB HIDs, the driver can be loaded automatically by the kernel and
supports hot swapping.
Sysfs entries
-------------
======================= ========================================================
fan1_input Fan speed (in rpm)
fan2_input Pump speed (in rpm)
temp1_input Coolant temperature (in millidegrees Celsius)
======================= ========================================================