1.. SPDX-License-Identifier: GPL-2.0-or-later 2 3Kernel driver nzxt-smart2 4========================= 5 6Supported devices: 7 8- NZXT RGB & Fan controller 9- NZXT Smart Device v2 10 11Description 12----------- 13 14This driver implements monitoring and control of fans plugged into the device. 15Besides typical speed monitoring and PWM duty cycle control, voltage and current 16is reported for every fan. 17 18The device also has two connectors for RGB LEDs; support for them isn't 19implemented (mainly because there is no standardized sysfs interface). 20 21Also, the device has a noise sensor, but the sensor seems to be completely 22useless (and very imprecise), so support for it isn't implemented too. 23 24Usage Notes 25----------- 26 27The device should be autodetected, and the driver should load automatically. 28 29If fans are plugged in/unplugged while the system is powered on, the driver 30must be reloaded to detect configuration changes; otherwise, new fans can't 31be controlled (`pwm*` changes will be ignored). It is necessary because the 32device has a dedicated "detect fans" command, and currently, it is executed only 33during initialization. Speed, voltage, current monitoring will work even without 34reload. As an alternative to reloading the module, a userspace tool (like 35`liquidctl`_) can be used to run "detect fans" command through hidraw interface. 36 37The driver coexists with userspace tools that access the device through hidraw 38interface with no known issues. 39 40.. _liquidctl: https://github.com/liquidctl/liquidctl 41 42Sysfs entries 43------------- 44 45======================= ======================================================== 46fan[1-3]_input Fan speed monitoring (in rpm). 47curr[1-3]_input Current supplied to the fan (in milliamperes). 48in[0-2]_input Voltage supplied to the fan (in millivolts). 49pwm[1-3] Controls fan speed: PWM duty cycle for PWM-controlled 50 fans, voltage for other fans. Voltage can be changed in 51 9-12 V range, but the value of the sysfs attribute is 52 always in 0-255 range (1 = 9V, 255 = 12V). Setting the 53 attribute to 0 turns off the fan completely. 54pwm[1-3]_enable 1 if the fan can be controlled by writing to the 55 corresponding pwm* attribute, 0 otherwise. The device 56 can control only the fans it detected itself, so the 57 attribute is read-only. 58pwm[1-3]_mode Read-only, 1 for PWM-controlled fans, 0 for other fans 59 (or if no fan connected). 60update_interval The interval at which all inputs are updated (in 61 milliseconds). The default is 1000ms. Minimum is 250ms. 62======================= ======================================================== 63