IT87 voltage registers update (#1567)

* Update SuperIOHardware.cs

The embedded switch on the model has no default and would break out of the manufacturer switch if the model wasn't Z790_Taichi.

* Fix the voltage registers for IT87

* Based on linux Hwmon
* Also go from 10 to 9 voltage readings, as no motherboard in LHM using IT87 has more than 9 voltage readings.

* Update SuperIOHardware.cs

* Update IT87XX.cs

Author: Rem0o

LibreHardwareMonitorLib/Hardware/Motherboard/Lpc/IT87XX.cs

@@ -8,7 +8,6 @@
 using System.Globalization;
 using System.Linq;
 using System.Text;
-using System.Threading;
 
 // ReSharper disable once InconsistentNaming
 
@@ -167,7 +166,7 @@ Chip.IT8631E or
                 break;
 
             case Chip.IT87952E:
-                Voltages = new float?[10];
+                Voltages = new float?[9];
                 Temperatures = new float?[3];
                 Fans = new float?[3];
                 Controls = new float?[3];
@@ -194,7 +193,7 @@ Chip.IT8631E or
                 Fans = new float?[3];
                 Controls = new float?[3];
                 break;
-            
+
             case Chip.IT8620E:
                 Voltages = new float?[9];
                 Temperatures = new float?[3];
@@ -428,7 +427,7 @@ public void Update()
 
         for (int i = 0; i < Voltages.Length; i++)
         {
-            float value = _voltageGain * ReadByte((byte)(VOLTAGE_BASE_REG + i), out bool valid);
+            float value = _voltageGain * ReadByte(IT87_REG_VIN[i], out bool valid);
 
             if (!valid)
                 continue;
@@ -602,7 +601,9 @@ private void RestoreDefaultFanPwmControl(int index)
 
     private const byte TEMPERATURE_BASE_REG = 0x29;
     private const byte VENDOR_ID_REGISTER = 0x58;
-    private const byte VOLTAGE_BASE_REG = 0x20;
+
+    // https://github.com/torvalds/linux/blob/master/drivers/hwmon/it87.c
+    private readonly byte[] IT87_REG_VIN = { 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x2f, 0x2c, 0x2d, 0x2e };
 
     private readonly byte[] FAN_PWM_CTRL_REG;
     private readonly byte[] FAN_PWM_CTRL_EXT_REG = { 0x63, 0x6b, 0x73, 0x7b, 0xa3, 0xab };

LibreHardwareMonitorLib/Hardware/Motherboard/SuperIOHardware.cs

@@ -452,9 +452,9 @@ private static void GetBoardSpecificConfiguration
                         c.Add(new Control("System Fan #1", 2));
                         c.Add(new Control("System Fan #2", 3));
                         c.Add(new Control("System Fan #3", 4));
-                        
+
                         break;
-                        
+
                     default:
                         v.Add(new Voltage("+12V", 0));
                         v.Add(new Voltage("+5V", 1));
@@ -3391,7 +3391,7 @@ private static void GetNuvotonConfigurationD(ISuperIO superIO, Manufacturer manu
                         f.Add(new Fan("Chassis Fan #1", 3)); // CHA_FAN1/WP
                         f.Add(new Fan("Chassis Fan #2", 4)); // CHA_FAN2/WP
                         f.Add(new Fan("Chassis Fan #3", 6)); // CHA_FAN3/WP
-                        
+
                         c.Add(new Control("CPU Fan #1", 1)); // CPU_FAN1
                         c.Add(new Control("CPU Fan #2", 0)); // CPU_FAN2/WP
                         c.Add(new Control("Chassis Fan #1", 3)); // CHA_FAN1/WP
@@ -4258,7 +4258,7 @@ private static void GetNuvotonConfigurationD(ISuperIO superIO, Manufacturer manu
                         v.Add(new Voltage("CMOS Battery", 8, 34, 34));
                         v.Add(new Voltage("CPU Termination", 9));
                         v.Add(new Voltage("CPU VDDIO / MC", 10, 1, 1));
-                        
+
                         t.Add(new Temperature("CPU", 22));
                         t.Add(new Temperature("Motherboard", 2));
                         t.Add(new Temperature("CPU Package", 3));
@@ -4573,7 +4573,7 @@ private static void GetNuvotonConfigurationD(ISuperIO superIO, Manufacturer manu
                         v.Add(new Voltage("+5V", 1, 4, 1));
                         v.Add(new Voltage("AVCC", 2, 34, 34));
                         v.Add(new Voltage("+3.3V", 3, 34, 34));
-                        v.Add(new Voltage("+12V", 4,  11, 1));
+                        v.Add(new Voltage("+12V", 4, 11, 1));
                         //v.Add(new Voltage("Voltage #6", 5));
                         v.Add(new Voltage("VIN4", 6, false));
                         v.Add(new Voltage("+3V Standby", 7, 34, 34));