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Extend aquacomputer_d5next driver to expose various hardware
sensors of the Aquacomputer High Flow Next flow sensor, which
communicates through a proprietary USB HID protocol.

The High Flow Next exposes +5V voltages, water quality, conductivity
and flow readings. A temperature sensor can be connected to it, in
which case it provides its reading and an estimation of the
dissipated/absorbed power in the liquid cooling loop.

Additionally, serial number and firmware version are exposed through
debugfs.

Registry offsets were discovered and tested by users on Github [1] [2].

[1] https://github.com/aleksamagicka/aquacomputer_d5next-hwmon/issues/8
[2] https://github.com/aleksamagicka/aquacomputer_d5next-hwmon/pull/34

Signed-off-by: Aleksa Savic <savicaleksa83@gmail.com>
Link: https://lore.kernel.org/r/20220907100739.806571-1-savicaleksa83@gmail.com

Signed-off-by: Guenter Roeck <linux@roeck-us.net>