/*

   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 IT87XX : IHardware {

     private string name;

     private Image icon;

     private bool available = false;

     private Chip chip;

     private ushort address;

     private Sensor[] temperatures;

     private Sensor[] fans;

     private Sensor[] voltages;

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

     private float[] voltageGains;

     // 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_16_BIT_ENABLE_REGISTER = 0x0c;

     private byte[] FAN_TACHOMETER_REG = 

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

     private byte[] FAN_TACHOMETER_EXT_REG =

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

     private const byte VOLTAGE_BASE_REG = 0x20;  

     private byte ReadByte(byte register) {

       WinRing0.WriteIoPortByte(

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

       return WinRing0.ReadIoPortByte((ushort)(address + DATA_REGISTER_OFFSET));

     }

     public IT87XX(Chip chip, ushort address) {

       this.chip = chip;

       this.address = address;

       switch (chip) {

         case Chip.IT8716: name = "ITE IT8716"; break;

         case Chip.IT8718: name = "ITE IT8718"; break;

         case Chip.IT8720: name = "ITE IT8720"; break;

         case Chip.IT8726: name = "ITE IT8726"; break;

         default: return;

       }

       // Check vendor id

       byte vendorId = ReadByte(VENDOR_ID_REGISTER);      

       if (vendorId != ITE_VENDOR_ID)

         return;

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

       if ((ReadByte(CONFIGURATION_REGISTER) & 0x10) == 0)

         return;

       temperatures = new Sensor[3];

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

         temperatures[i] = new Sensor("Temperature #" + (i + 1), i,

           SensorType.Temperature, this);

       fans = new Sensor[5];

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

         fans[i] = new Sensor("Fan #" + (i + 1), i, SensorType.Fan, this);

       voltageGains = new float[] { 

         1, 1, 1, (6.8f / 10 + 1), 1, 1, 1, 1, 1 };

       voltages = new Sensor[2];

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

       voltages[1] = new Sensor("Battery", 8, SensorType.Voltage, this);           

       available = true;

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

     }

     public bool IsAvailable {

       get { return available; } 

     }

     public string Name {

       get { return name; }

     }

     public string Identifier {

       get { return "/lpc/it87"; }

     }

     public Image Icon {

       get { return icon; }

     }

     public ISensor[] Sensors {

       get { return active.ToArray(); }

     }

     public string GetReport() {

       StringBuilder r = new StringBuilder();

       r.AppendLine("LPC IT87XX");

       r.AppendLine();

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

       r.Append("Chip Name: "); r.AppendLine(name);

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

       r.AppendLine();

       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")); r.Append("  ");

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

           r.Append(" ");

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

         }

         r.AppendLine();

       }

       r.AppendLine();

       return r.ToString();

     }

     public void Update() {

       foreach (Sensor sensor in voltages) {

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

         sensor.Value = voltageGains[sensor.Index] * 0.001f * (value << 4);

         if (sensor.Value > 0)

           ActivateSensor(sensor);

         else

           DeactivateSensor(sensor);

       }

       foreach (Sensor sensor in temperatures) {

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

         sensor.Value = value;

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

           ActivateSensor(sensor);

         else

           DeactivateSensor(sensor);

       }

       foreach (Sensor sensor in fans) {

         int value = ReadByte(FAN_TACHOMETER_REG[sensor.Index]);

         value |= ReadByte(FAN_TACHOMETER_EXT_REG[sensor.Index]) << 8;

         if (value > 0) {

           sensor.Value = (value < 0xffff) ? 1.35e6f / ((value) * 2) : 0;

           ActivateSensor(sensor);

         } else {

           DeactivateSensor(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;

   }

 }