1 .. SPDX-License-Identifier: GPL-2.0-or-later
3 Kernel driver nzxt-kraken3
4 ==========================
15 * NZXT Kraken 2023 Elite
17 Author: Jonas Malaco, Aleksa Savic
22 This driver enables hardware monitoring support for NZXT Kraken X53/X63/X73,
23 Z53/Z63/Z73 and Kraken 2023 (standard and Elite) all-in-one CPU liquid coolers.
24 All models expose liquid temperature and pump speed (in RPM), as well as PWM
25 control (either as a fixed value or through a temp-PWM curve). The Z-series and
26 Kraken 2023 models additionally expose the speed and duty of an optionally connected
27 fan, with the same PWM control capabilities.
29 Pump and fan duty control mode can be set through pwm[1-2]_enable, where 1 is
30 for the manual control mode and 2 is for the liquid temp to PWM curve mode.
31 Writing a 0 disables control of the channel through the driver after setting its
34 The temperature of the curves relates to the fixed [20-59] range, correlating to
35 the detected liquid temperature. Only PWM values (ranging from 0-255) can be set.
36 If in curve mode, setting point values should be done in moderation - the devices
37 require complete curves to be sent for each change; they can lock up or discard
38 the changes if they are too numerous at once. Suggestion is to set them while
39 in an another mode, and then apply them by switching to curve.
41 The devices can report if they are faulty. The driver supports that situation
42 and will issue a warning. This can also happen when the USB cable is connected,
43 but SATA power is not.
45 The addressable RGB LEDs and LCD screen (only on Z-series and Kraken 2023 models)
46 are not supported in this driver, but can be controlled through existing userspace
47 tools, such as `liquidctl`_.
49 .. _liquidctl: https://github.com/liquidctl/liquidctl
54 As these are USB HIDs, the driver can be loaded automatically by the kernel and
55 supports hot swapping.
57 Possible pwm_enable values are:
59 ====== ==========================================================================
61 1 Direct PWM mode (applies value in corresponding PWM entry)
62 2 Curve control mode (applies the temp-PWM duty curve based on coolant temp)
63 ====== ==========================================================================
68 ============================== ================================================================
69 fan1_input Pump speed (in rpm)
70 fan2_input Fan speed (in rpm)
71 temp1_input Coolant temperature (in millidegrees Celsius)
72 pwm1 Pump duty (value between 0-255)
73 pwm1_enable Pump duty control mode (0: disabled, 1: manual, 2: curve)
74 pwm2 Fan duty (value between 0-255)
75 pwm2_enable Fan duty control mode (0: disabled, 1: manual, 2: curve)
76 temp[1-2]_auto_point[1-40]_pwm Temp-PWM duty curves (for pump and fan), related to coolant temp
77 ============================== ================================================================