This driver enables hardware monitoring support for NZXT Kraken
X53/X63/X73 and Z53/Z63/Z73 all-in-one CPU liquid coolers.

All models expose liquid temperature and pump speed (in RPM), as well as
PWM control (natively only through a temp-PWM curve, but the driver also
emulates fixed PWM control on top of that). The Z-series models
additionally expose the speed and duty of an optionally connected fan,
with the same PWM control capabilities.

Pump and fan duty control mode can be set through pwm[1-2]_enable,
where 1 is for the manual control mode and 2 is for the liquid temp
to PWM curve mode. Writing a 0 disables control of the channel through
the driver after setting its duty to 100%. As it is not possible to query
the device for the active mode, the driver keeps track of it.

The temperature of the curves relates to the fixed [20-59] C range, per
device limitations, and correlating to the detected liquid temperature.
Only PWM values (ranging from 0-255) can be set.

The addressable RGB LEDs and LCD screen, included only on Z-series models,
are not supported in this driver.
Co-developed-by: Jonas Malaco <jonas@protocubo.io>
Signed-off-by: Jonas Malaco <jonas@protocubo.io>
Co-developed-by: Yury Zhuravlev <stalkerg@gmail.com>
Signed-off-by: Yury Zhuravlev <stalkerg@gmail.com>
Signed-off-by: Aleksa Savic <savicaleksa83@gmail.com>
Link: https://lore.kernel.org/r/20240129111932.368232-1-savicaleksa83@gmail.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>