/*

  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;

using System.Collections.Generic;

using System.Drawing;

using System.Text;

namespace OpenHardwareMonitor.Hardware.LPC {

  public class W83627DHG : IHardware {

    private byte revision;

    private string name;

    private Image icon;

    private bool available = false;

    private ushort address;

    private List<ISensor> active = new List<ISensor>();

    private Sensor[] temperatures;

    private Sensor[] fans;

    private Sensor[] voltages;

    private float[] voltageGains;

    // Consts 

    private const ushort WINBOND_VENDOR_ID = 0x5CA3;

    private const byte HIGH_BYTE = 0x80;

    // Hardware Monitor

    private const byte ADDRESS_REGISTER_OFFSET = 0x05;

    private const byte DATA_REGISTER_OFFSET = 0x06;

    // Hardware Monitor Registers

    private const byte VOLTAGE_BASE_REG = 0x20;

    private const byte BANK_SELECT_REGISTER = 0x04E;

    private const byte VENDOR_ID_REGISTER = 0x4F;

    private const byte FIRST_BANK_REGISTER = 0x50;

    private const byte TEMPERATURE_BASE_REG = 0x50;

    private const byte TEMPERATURE_SYS_REG = 0x27;

    private byte[] FAN_TACHO_REG = new byte[] { 0x28, 0x29, 0x2A, 0x3F, 0x53 };

    private byte[] FAN_TACHO_BANK = new byte[] { 0, 0, 0, 0, 5 };    

    private string[] FAN_NAME = new string[] 

      { "System", "CPU #1", "Auxiliary #1", "CPU #2", "Auxiliary #2" };

    private byte[] FAN_BIT_REG = new byte[] { 0x47, 0x4B, 0x4C, 0x59, 0x5D };

    private byte[] FAN_DIV_BIT0 = new byte[] { 36, 38, 30, 8, 10 };

    private byte[] FAN_DIV_BIT1 = new byte[] { 37, 39, 31, 9, 11 };

    private byte[] FAN_DIV_BIT2 = new byte[] { 5, 6, 7, 23, 15 };

    private byte ReadByte(byte bank, byte register) {  

      WinRing0.WriteIoPortByte(

         (ushort)(address + ADDRESS_REGISTER_OFFSET), BANK_SELECT_REGISTER);

      WinRing0.WriteIoPortByte(

         (ushort)(address + DATA_REGISTER_OFFSET), bank);

      WinRing0.WriteIoPortByte(

         (ushort)(address + ADDRESS_REGISTER_OFFSET), register);

      return WinRing0.ReadIoPortByte(

        (ushort)(address + DATA_REGISTER_OFFSET));

    }    

    public W83627DHG(byte revision, ushort address) {      

      this.revision = revision;

      this.address = address;

      // Check vendor id

      ushort vendorId =

        (ushort)((ReadByte(HIGH_BYTE, VENDOR_ID_REGISTER) << 8) |

           ReadByte(0, VENDOR_ID_REGISTER));

      if (vendorId != WINBOND_VENDOR_ID)

        return;

      voltageGains = new float[] { 0.008f, 1, 1, 0.016f, 1, 1, 1, 0.016f };

      voltages = new Sensor[3];

      voltages[0] = new Sensor("CPU VCore", 0, SensorType.Voltage, this);

      voltages[1] = new Sensor("+3.3V", 3, SensorType.Voltage, this);

      voltages[2] = new Sensor("Battery", 7, SensorType.Voltage, this);

      temperatures = new Sensor[3];

      temperatures[0] = new Sensor("CPU", 0, SensorType.Temperature, this);

      temperatures[1] = new Sensor("Auxiliary", 1, SensorType.Temperature, this);

      temperatures[2] = new Sensor("System", 2, SensorType.Temperature, this);

      fans = new Sensor[FAN_NAME.Length];

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

        fans[i] = new Sensor(FAN_NAME[i], i, SensorType.Fan, this);

      this.name = "Winbond W83627DHG";

      this.icon = Utilities.EmbeddedResources.GetImage("chip.png");

      available = true;

    }

    public bool IsAvailable {

      get { return available; }

    }

    public string Name {

      get { return name; }

    }

    public string Identifier {

      get { return "/lpc/w83627dhg"; }

    }

    public Image Icon {

      get { return icon; }

    }

    public ISensor[] Sensors {

      get { return active.ToArray(); }

    }

    public string GetReport() {

      StringBuilder r = new StringBuilder();

      r.AppendLine("LPC W83627DHG");

      r.AppendLine();

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

      r.Append("Base Adress: 0x"); r.AppendLine(address.ToString("X4"));

      r.AppendLine();

      r.AppendLine("Hardware Monitor 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 < 0x7; i++) {

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

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

          r.Append(" ");

          r.Append(ReadByte(0, (byte)((i << 4) | j)).ToString("X2"));

        }

        r.AppendLine();

      }      

      for (int k = 1; k <=5; k++) {

        r.AppendLine("Bank " + k);

        for (int i = 0x5; i < 0x6; i++) {

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

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

            r.Append(" ");

            r.Append(ReadByte((byte)(k), 

              (byte)((i << 4) | j)).ToString("X2"));

          }

          r.AppendLine();

        }        

      }

      r.AppendLine();

      return r.ToString();

    }

    public void Update() {

      foreach (Sensor sensor in voltages) {

        if (sensor.Index < 7) {

          int value = ReadByte(0, (byte)(VOLTAGE_BASE_REG + sensor.Index));

          sensor.Value = voltageGains[sensor.Index] * value;

          if (sensor.Value > 0)

            ActivateSensor(sensor);

          else

            DeactivateSensor(sensor);

        } else {

          // Battery voltage

          bool valid = (ReadByte(0, 0x5D) & 0x01) > 0;

          if (valid) {

            sensor.Value = voltageGains[sensor.Index] * 

              ReadByte(5, 0x51);

            ActivateSensor(sensor);

          } else

            DeactivateSensor(sensor);

        }

      }

      foreach (Sensor sensor in temperatures) {

        int value;

        if (sensor.Index < 2) {

          value = ReadByte((byte)(sensor.Index + 1), TEMPERATURE_BASE_REG);

          value = (value << 1) | ReadByte((byte)(sensor.Index + 1),

            (byte)(TEMPERATURE_BASE_REG + 1)) >> 7;

        } else {

          value = ReadByte(0, TEMPERATURE_SYS_REG) << 1;

        }

        sensor.Value = value / 2.0f;

        if (value < 0x1FE)

          ActivateSensor(sensor);

        else

          DeactivateSensor(sensor);

      }

      long bits = 0;

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

        bits = (bits << 8) | ReadByte(0, FAN_BIT_REG[i]);

      foreach (Sensor sensor in fans) {

        int count = ReadByte(FAN_TACHO_BANK[sensor.Index], 

          FAN_TACHO_REG[sensor.Index]);

        int divisorBits = (int)(

          (((bits >> FAN_DIV_BIT2[sensor.Index]) & 1) << 2) |

          (((bits >> FAN_DIV_BIT1[sensor.Index]) & 1) << 1) |

           ((bits >> FAN_DIV_BIT0[sensor.Index]) & 1));

        int divisor = 1 << divisorBits;

        sensor.Value = (count < 0xff) ? 1.35e6f / (count * divisor) : 0;

        ActivateSensor(sensor);        

      }     

    }

    private void ActivateSensor(Sensor sensor) {

      if (!active.Contains(sensor)) {

        active.Add(sensor);

        if (SensorAdded != null)

          SensorAdded(sensor);

      }

    }

    private void DeactivateSensor(Sensor sensor) {

      if (active.Contains(sensor)) {

        active.Remove(sensor);

        if (SensorRemoved != null)

          SensorRemoved(sensor);

      }

    }

    public event SensorEventHandler SensorAdded;

    public event SensorEventHandler SensorRemoved;

  }

}