/*

   Version: MPL 1.1/GPL 2.0/LGPL 2.1

   The contents of this file are subject to the Mozilla Public License Version

   1.1 (the "License"); you may not use this file except in compliance with

   the License. You may obtain a copy of the License at

   http://www.mozilla.org/MPL/

   Software distributed under the License is distributed on an "AS IS" basis,

   WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License

   for the specific language governing rights and limitations under the License.

   The Original Code is the Open Hardware Monitor code.

   The Initial Developer of the Original Code is 

   Michael Möller <m.moeller@gmx.ch>.

   Portions created by the Initial Developer are Copyright (C) 2009-2010

   the Initial Developer. All Rights Reserved.

   Contributor(s):

   Alternatively, the contents of this file may be used under the terms of

   either the GNU General Public License Version 2 or later (the "GPL"), or

   the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),

   in which case the provisions of the GPL or the LGPL are applicable instead

   of those above. If you wish to allow use of your version of this file only

   under the terms of either the GPL or the LGPL, and not to allow others to

   use your version of this file under the terms of the MPL, indicate your

   decision by deleting the provisions above and replace them with the notice

   and other provisions required by the GPL or the LGPL. If you do not delete

   the provisions above, a recipient may use your version of this file under

   the terms of any one of the MPL, the GPL or the LGPL.

 */

 using System.Globalization;

 using System.Text;

 namespace OpenHardwareMonitor.Hardware.LPC {

   internal class IT87XX : ISuperIO {

     private readonly ushort address;

     private readonly Chip chip;

     private readonly byte version;

     private readonly ushort gpioAddress;

     private readonly int gpioCount;

     private readonly ushort addressReg;

     private readonly ushort dataReg;

     private readonly float?[] voltages = new float?[0];

     private readonly float?[] temperatures = new float?[0];

     private readonly float?[] fans = new float?[0];

     private readonly float voltageGain;

     private readonly bool has16bitFanCounter;

     // Consts

     private const byte ITE_VENDOR_ID = 0x90;

     // Environment Controller

     private const byte ADDRESS_REGISTER_OFFSET = 0x05;

     private const byte DATA_REGISTER_OFFSET = 0x06;

     // Environment Controller Registers    

     private const byte CONFIGURATION_REGISTER = 0x00;

     private const byte TEMPERATURE_BASE_REG = 0x29;

     private const byte VENDOR_ID_REGISTER = 0x58;

     private const byte FAN_TACHOMETER_DIVISOR_REGISTER = 0x0B;

     private readonly byte[] FAN_TACHOMETER_REG = 

       new byte[] { 0x0d, 0x0e, 0x0f, 0x80, 0x82 };

     private readonly byte[] FAN_TACHOMETER_EXT_REG =

       new byte[] { 0x18, 0x19, 0x1a, 0x81, 0x83 };

     private const byte VOLTAGE_BASE_REG = 0x20;

     private byte ReadByte(byte register, out bool valid) {

       Ring0.WriteIoPort(addressReg, register);

       byte value = Ring0.ReadIoPort(dataReg);

       valid = register == Ring0.ReadIoPort(addressReg);

       return value;

     }

     private bool WriteByte(byte register, byte value) {

       Ring0.WriteIoPort(addressReg, register);

       Ring0.WriteIoPort(dataReg, value);

       return register == Ring0.ReadIoPort(addressReg); 

     } 

     public byte? ReadGPIO(int index) {

       if (index >= gpioCount)

         return null;

       return Ring0.ReadIoPort((ushort)(gpioAddress + index));

     }

     public void WriteGPIO(int index, byte value) {

       if (index >= gpioCount)

         return;

       Ring0.WriteIoPort((ushort)(gpioAddress + index), value);

     }

     public IT87XX(Chip chip, ushort address, ushort gpioAddress, byte version) {

       this.address = address;

       this.chip = chip;

       this.version = version;

       this.addressReg = (ushort)(address + ADDRESS_REGISTER_OFFSET);

       this.dataReg = (ushort)(address + DATA_REGISTER_OFFSET);

       this.gpioAddress = gpioAddress;

       // Check vendor id

       bool valid;

       byte vendorId = ReadByte(VENDOR_ID_REGISTER, out valid);       

       if (!valid || vendorId != ITE_VENDOR_ID)

         return;

       // Bit 0x10 of the configuration register should always be 1

       if ((ReadByte(CONFIGURATION_REGISTER, out valid) & 0x10) == 0)

         return;

       if (!valid)

         return;

       voltages = new float?[9];

       temperatures = new float?[3];

       fans = new float?[5];

       // The IT8721F uses a 12mV resultion ADC, all others 16mV

       if (chip == Chip.IT8721F || chip == Chip.IT8728F) {

         voltageGain = 0.012f;

       } else {

         voltageGain = 0.016f;        

       }

       // older IT8721F revision do not have 16-bit fan counters

       if (chip == Chip.IT8712F && version < 8) {

         has16bitFanCounter = false;

       } else {

         has16bitFanCounter = true;

       }

       // Set the number of GPIO sets

       switch (chip) {

         case Chip.IT8712F:

         case Chip.IT8716F:

         case Chip.IT8718F:

         case Chip.IT8726F:

           gpioCount = 5;

           break;

         case Chip.IT8720F:

         case Chip.IT8721F:

           gpioCount = 8;

           break;

         case Chip.IT8728F:

           gpioCount = 0;

           break;

       }

     }

     public Chip Chip { get { return chip; } }

     public float?[] Voltages { get { return voltages; } }

     public float?[] Temperatures { get { return temperatures; } }

     public float?[] Fans { get { return fans; } }

     public string GetReport() {

       StringBuilder r = new StringBuilder();

       r.AppendLine("LPC " + this.GetType().Name);

       r.AppendLine();

       r.Append("Chip ID: 0x"); r.AppendLine(chip.ToString("X"));

       r.Append("Chip Version: 0x"); r.AppendLine(

         version.ToString("X", CultureInfo.InvariantCulture));

       r.Append("Base Address: 0x"); r.AppendLine(

         address.ToString("X4", CultureInfo.InvariantCulture));

       r.Append("GPIO Address: 0x"); r.AppendLine(

         gpioAddress.ToString("X4", CultureInfo.InvariantCulture));

       r.AppendLine();

       if (!Ring0.WaitIsaBusMutex(100))

         return r.ToString();

       r.AppendLine("Environment Controller Registers");

       r.AppendLine();

       r.AppendLine("      00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F");

       r.AppendLine();

       for (int i = 0; i <= 0xA; i++) {

         r.Append(" "); 

         r.Append((i << 4).ToString("X2", CultureInfo.InvariantCulture)); 

         r.Append("  ");

         for (int j = 0; j <= 0xF; j++) {

           r.Append(" ");

           bool valid;

           byte value = ReadByte((byte)((i << 4) | j), out valid);

           r.Append(

             valid ? value.ToString("X2", CultureInfo.InvariantCulture) : "??");

         }

         r.AppendLine();

       }

       r.AppendLine();

       r.AppendLine("GPIO Registers");

       r.AppendLine();

       for (int i = 0; i < gpioCount; i++) {

         r.Append(" ");

         r.Append(ReadGPIO(i).Value.ToString("X2",

           CultureInfo.InvariantCulture));

       }

       r.AppendLine();

       r.AppendLine();

       Ring0.ReleaseIsaBusMutex();

       return r.ToString();

     }

     public void Update() {

       if (!Ring0.WaitIsaBusMutex(10))

         return;

       for (int i = 0; i < voltages.Length; i++) {

         bool valid;

         float value = 

           voltageGain * ReadByte((byte)(VOLTAGE_BASE_REG + i), out valid);   

         if (!valid)

           continue;

         if (value > 0)

           voltages[i] = value;  

         else

           voltages[i] = null;

       }

       for (int i = 0; i < temperatures.Length; i++) {

         bool valid;

         sbyte value = (sbyte)ReadByte(

           (byte)(TEMPERATURE_BASE_REG + i), out valid);

         if (!valid)

           continue;

         if (value < sbyte.MaxValue && value > 0)

           temperatures[i] = value;

         else

           temperatures[i] = null;       

       }

       if (has16bitFanCounter) {

         for (int i = 0; i < fans.Length; i++) {

           bool valid;

           int value = ReadByte(FAN_TACHOMETER_REG[i], out valid);

           if (!valid)

             continue;

           value |= ReadByte(FAN_TACHOMETER_EXT_REG[i], out valid) << 8;

           if (!valid)

             continue;

           if (value > 0x3f) {

             fans[i] = (value < 0xffff) ? 1.35e6f / (value * 2) : 0;

           } else {

             fans[i] = null;

           }

         }

       } else {

         for (int i = 0; i < fans.Length; i++) {

           bool valid;

           int value = ReadByte(FAN_TACHOMETER_REG[i], out valid);

           if (!valid)

             continue;

           int divisor = 2;

           if (i < 2) {

             int divisors = ReadByte(FAN_TACHOMETER_DIVISOR_REGISTER, out valid);

             if (!valid)

               continue;

             divisor = 1 << ((divisors >> (3 * i)) & 0x7);

           }

           if (value > 0) {

             fans[i] = (value < 0xff) ? 1.35e6f / (value * divisor) : 0;

           } else {

             fans[i] = null;

           }

         }

       }

       Ring0.ReleaseIsaBusMutex();

     }

   } 

 }