/*

   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.Text;

 using System.Threading;

 namespace OpenHardwareMonitor.Hardware.LPC {

   public class LPCGroup : IGroup {

     private List<IHardware> hardware = new List<IHardware>();

     private Chip chip = Chip.Unknown;

     // I/O Ports

     private const ushort REGISTER_PORT = 0x2e;

     private const ushort VALUE_PORT = 0x2f;

     // Registers

     private const byte CONFIGURATION_CONTROL_REGISTER = 0x02;

     private const byte DEVCIE_SELECT_REGISTER = 0x07;

     private const byte CHIP_ID_REGISTER = 0x20;

     private const byte CHIP_REVISION_REGISTER = 0x21;

     private static byte ReadByte(byte register) {

       WinRing0.WriteIoPortByte(REGISTER_PORT, register);

       return WinRing0.ReadIoPortByte(VALUE_PORT);

     }

     private static ushort ReadWord(byte register) {

       ushort value;

       WinRing0.WriteIoPortByte(REGISTER_PORT, register);

       value = (ushort)(((ushort)WinRing0.ReadIoPortByte(VALUE_PORT)) << 8);

       WinRing0.WriteIoPortByte(REGISTER_PORT, (byte)(register + 1));

       value |= (ushort)WinRing0.ReadIoPortByte(VALUE_PORT);

       return value;

     }

     private static void Select(byte logicalDeviceNumber) {

       WinRing0.WriteIoPortByte(REGISTER_PORT, DEVCIE_SELECT_REGISTER);

       WinRing0.WriteIoPortByte(VALUE_PORT, logicalDeviceNumber);

     }

     // IT87

     private const ushort IT8716F_CHIP_ID = 0x8716;

     private const ushort IT8718F_CHIP_ID = 0x8718;

     private const ushort IT8720F_CHIP_ID = 0x8720;

     private const ushort IT8726F_CHIP_ID = 0x8726;

     private const byte IT87_ENVIRONMENT_CONTROLLER_LDN = 0x04;

     private const byte IT87_ENVIRONMENT_CONTROLLER_BASE_ADDR_REG = 0x60;

     private static void IT87Enter() {

       WinRing0.WriteIoPortByte(REGISTER_PORT, 0x87);

       WinRing0.WriteIoPortByte(REGISTER_PORT, 0x01);

       WinRing0.WriteIoPortByte(REGISTER_PORT, 0x55);

       WinRing0.WriteIoPortByte(REGISTER_PORT, 0x55);

     }

     internal static void IT87Exit() {

       WinRing0.WriteIoPortByte(REGISTER_PORT, CONFIGURATION_CONTROL_REGISTER);

       WinRing0.WriteIoPortByte(VALUE_PORT, 0x02);

     }

     // Winbond

     private static void WinbondEnter() {

       WinRing0.WriteIoPortByte(REGISTER_PORT, 0x87);

       WinRing0.WriteIoPortByte(REGISTER_PORT, 0x87);

     }

     private static void WinbondExit() {

       WinRing0.WriteIoPortByte(REGISTER_PORT, 0xAA);      

     }

     public LPCGroup() {

       if (!WinRing0.IsAvailable)

         return;

       WinbondEnter();

       byte id = ReadByte(CHIP_ID_REGISTER);

       byte revision = ReadByte(CHIP_REVISION_REGISTER);

       switch (id) {

         case 0xA0:

           switch (revision & 0xF0) {

             case 0x20: chip = Chip.W83627DHG; break;

             default: chip = Chip.Unknown; break;

           } break;

         default: chip = Chip.Unknown; break;

       }

       if (chip != Chip.Unknown) {

         WinbondExit();

         W83627DHG w83627dhg = new W83627DHG(revision);

         if (w83627dhg.IsAvailable)

           hardware.Add(w83627dhg);

         return;

       }

       IT87Enter();

       switch (ReadWord(CHIP_ID_REGISTER)) {

         case 0x8716: chip = Chip.IT8716F; break;

         case 0x8718: chip = Chip.IT8718F; break;

         case 0x8720: chip = Chip.IT8720F; break;

         case 0x8726: chip = Chip.IT8726F; break;

         default: chip = Chip.Unknown; break;

       }

       if (chip != Chip.Unknown) {        

         Select(IT87_ENVIRONMENT_CONTROLLER_LDN);

         ushort address = ReadWord(IT87_ENVIRONMENT_CONTROLLER_BASE_ADDR_REG);

         Thread.Sleep(1);

         ushort verify = ReadWord(IT87_ENVIRONMENT_CONTROLLER_BASE_ADDR_REG);

         IT87Exit();

         if (address != verify || address == 0 || (address & 0xF007) != 0)

           return;

         IT87 it87 = new IT87(chip, address);

         if (it87.IsAvailable)

           hardware.Add(it87);

         return;

       }                

     }

     public IHardware[] Hardware {

       get {

         return hardware.ToArray();

       }

     }

     public string GetReport() {

       return null;

     }

     public void Close() { }

   }

 }