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diff --git a/Documentation/hwmon/nzxt-smart2.rst b/Documentation/hwmon/nzxt-smart2.rst new file mode 100644 index 000000000000..d9d1b2742665 --- /dev/null +++ b/Documentation/hwmon/nzxt-smart2.rst @@ -0,0 +1,62 @@ +.. SPDX-License-Identifier: GPL-2.0-or-later + +Kernel driver nzxt-smart2 +========================= + +Supported devices: + +- NZXT RGB & Fan controller +- NZXT Smart Device v2 + +Description +----------- + +This driver implements monitoring and control of fans plugged into the device. +Besides typical speed monitoring and PWM duty cycle control, voltage and current +is reported for every fan. + +The device also has two connectors for RGB LEDs; support for them isn't +implemented (mainly because there is no standardized sysfs interface). + +Also, the device has a noise sensor, but the sensor seems to be completely +useless (and very imprecise), so support for it isn't implemented too. + +Usage Notes +----------- + +The device should be autodetected, and the driver should load automatically. + +If fans are plugged in/unplugged while the system is powered on, the driver +must be reloaded to detect configuration changes; otherwise, new fans can't +be controlled (`pwm*` changes will be ignored). It is necessary because the +device has a dedicated "detect fans" command, and currently, it is executed only +during initialization. Speed, voltage, current monitoring will work even without +reload. As an alternative to reloading the module, a userspace tool (like +`liquidctl`_) can be used to run "detect fans" command through hidraw interface. + +The driver coexists with userspace tools that access the device through hidraw +interface with no known issues. + +.. _liquidctl: https://github.com/liquidctl/liquidctl + +Sysfs entries +------------- + +======================= ======================================================== +fan[1-3]_input Fan speed monitoring (in rpm). +curr[1-3]_input Current supplied to the fan (in milliamperes). +in[0-2]_input Voltage supplied to the fan (in millivolts). +pwm[1-3] Controls fan speed: PWM duty cycle for PWM-controlled + fans, voltage for other fans. Voltage can be changed in + 9-12 V range, but the value of the sysfs attribute is + always in 0-255 range (1 = 9V, 255 = 12V). Setting the + attribute to 0 turns off the fan completely. +pwm[1-3]_enable 1 if the fan can be controlled by writing to the + corresponding pwm* attribute, 0 otherwise. The device + can control only the fans it detected itself, so the + attribute is read-only. +pwm[1-3]_mode Read-only, 1 for PWM-controlled fans, 0 for other fans + (or if no fan connected). +update_interval The interval at which all inputs are updated (in + milliseconds). The default is 1000ms. Minimum is 250ms. +======================= ======================================================== |