hwmon: (aquacomputer_d5next) Add support for reading virtual temp sensors

Add support for reading virtual temperature sensors for the D5 Next, Octo,
Quadro and Farbwerk 360.

Virtual temperature sensors are written to the device by the user, pulling
from an arbitrary value source. Writing to them is not yet reverse
engineered, so the only way to set them for now is to use the official
software.

Signed-off-by: Aleksa Savic <savicaleksa83@gmail.com>
Link: https://lore.kernel.org/r/20220817121441.112198-1-savicaleksa83@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 19 insertions, 13 deletions

diff --git a/Documentation/hwmon/aquacomputer_d5next.rst b/Documentation/hwmon/aquacomputer_d5next.rst
index 33649a1e3a05..b63a78d47624 100644
--- a/Documentation/hwmon/aquacomputer_d5next.rst
+++ b/Documentation/hwmon/aquacomputer_d5next.rst
@@ -20,10 +20,11 @@ This driver exposes hardware sensors of listed Aquacomputer devices, which
 communicate through proprietary USB HID protocols.
 
 For the D5 Next pump, available sensors are pump and fan speed, power, voltage
-and current, as well as coolant temperature. Also available through debugfs are
-the serial number, firmware version and power-on count. Attaching a fan to it is
-optional and allows it to be controlled using temperature curves directly from the
-pump. If it's not connected, the fan-related sensors will report zeroes.
+and current, as well as coolant temperature and eight virtual temp sensors. Also
+available through debugfs are the serial number, firmware version and power-on
+count. Attaching a fan to it is optional and allows it to be controlled using
+temperature curves directly from the pump. If it's not connected, the fan-related
+sensors will report zeroes.
 
 The pump can be configured either through software or via its physical
 interface. Configuring the pump through this driver is not implemented, as it
@@ -31,14 +32,19 @@ seems to require sending it a complete configuration. That includes addressable
 RGB LEDs, for which there is no standard sysfs interface. Thus, that task is
 better suited for userspace tools.
 
-The Octo exposes four temperature sensors and eight PWM controllable fans, along
-with their speed (in RPM), power, voltage and current.
+The Octo exposes four physical and sixteen virtual temperature sensors, as well as
+eight PWM controllable fans, along with their speed (in RPM), power, voltage and
+current.
 
-The Quadro exposes four temperature sensors, a flow sensor and four PWM controllable
-fans, along with their speed (in RPM), power, voltage and current.
+The Quadro exposes four physical and sixteen virtual temperature sensors, a flow
+sensor and four PWM controllable fans, along with their speed (in RPM), power,
+voltage and current.
 
-The Farbwerk and Farbwerk 360 expose four temperature sensors. Depending on the device,
-not all sysfs and debugfs entries will be available.
+The Farbwerk and Farbwerk 360 expose four temperature sensors. Additionally,
+sixteen virtual temperature sensors of the Farbwerk 360 are exposed.
+
+Depending on the device, not all sysfs and debugfs entries will be available.
+Writing to virtual temperature sensors is not currently supported.
 
 Usage notes
 -----------
@@ -49,14 +55,14 @@ the kernel and supports hotswapping.
 Sysfs entries
 -------------
 
-================ ==============================================
-temp[1-4]_input  Temperature sensors (in millidegrees Celsius)
+================ ==============================================================
+temp[1-20]_input Physical/virtual temperature sensors (in millidegrees Celsius)
 fan[1-8]_input   Pump/fan speed (in RPM) / Flow speed (in dL/h)
 power[1-8]_input Pump/fan power (in micro Watts)
 in[0-7]_input    Pump/fan voltage (in milli Volts)
 curr[1-8]_input  Pump/fan current (in milli Amperes)
 pwm[1-8]         Fan PWM (0 - 255)
-================ ==============================================
+================ ==============================================================
 
 Debugfs entries
 ---------------