1 /*

     2 * Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies). 

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:  An example implementation for ISC Driver Reference

    15 *

    16 */

    17 

    18 

    19 

    20 // INCLUDE FILES

    21 #include <kernel.h>

    22 #include "IscSendQueue.h"

    23 #include "IscTrace.h"

    24 

    25 // EXTERNAL DATA STRUCTURES

    26 

    27 // EXTERNAL FUNCTION PROTOTYPES  

    28 

    29 // CONSTANTS

    30 const TInt KImpossibleChannelId( 255 );

    31 

    32 // MACROS

    33 

    34 // LOCAL CONSTANTS AND MACROS

    35 

    36 // MODULE DATA STRUCTURES

    37 

    38 // LOCAL FUNCTION PROTOTYPES

    39 

    40 // FORWARD DECLARATIONS

    41 

    42 

    43 // ============================ MEMBER FUNCTIONS ===============================

    44 

    45 // -----------------------------------------------------------------------------

    46 // DIscSendQueue::DIscSendQueue

    47 // C++ default constructor can NOT contain any code, that

    48 // might leave.

    49 // -----------------------------------------------------------------------------

    50 //

    51 EXPORT_C DIscSendQueue::DIscSendQueue( TUint32** aQueue, TIscSendFrameInfo** aParameterQueue, TUint16 aSize )

    52          :iParameterQueue( aParameterQueue )

    53     {

    54     iHead  = 0;

    55     iTail  = 0;

    56     iCount = 0;

    57     iQueue = aQueue;

    58     iSize  = aSize;

    59     for ( TInt i( 0 ); i < aSize; i++ )

    60         {

    61         iParameterQueue[i]->iChannelId = KImpossibleChannelId;

    62         iParameterQueue[i]->iChannelPtr = NULL;

    63         iParameterQueue[i]->iFrameInfo = NULL;

    64         }

    65     E_TRACE( ( _T( "ISQ:ISQ %d 0x%x" ), iSize, iQueue ) );

    66     }

    67     

    68 // Destructor

    69 EXPORT_C DIscSendQueue::~DIscSendQueue()

    70     {

    71     iHead       = 0;

    72     iTail       = 0;

    73     iCount      = 0;

    74     iQueue      = NULL;

    75     iParameterQueue = NULL;

    76     iSize       = 0;

    77     }

    78 

    79 

    80 // -----------------------------------------------------------------------------

    81 // DIscSendQueue::Add

    82 // Function to add element to queue

    83 // ( other items were commented in a header ).

    84 // -----------------------------------------------------------------------------

    85 //

    86 EXPORT_C TInt DIscSendQueue::Add( TAny* anEntry, TUint16 aId, DIscChannel* aChannelPtr, TAny* aFrameInfo )

    87     {

    88     E_TRACE( ( _T( "ISQ:A %d, 0x%x" ), iCount, iQueue ) );

    89 

    90     TInt irqLevel = DisableIrqs();

    91 

    92     if ( iCount == iSize || iSize == 0 )

    93         {

    94         RestoreIrqs( irqLevel );

    95         return KErrNoMemory;//EFalse;

    96         }

    97 

    98     /* place the buffer into the queue */

    99     iQueue[ iTail ] = ( TUint32* )( anEntry );

   100 

   101     TIscSendFrameInfo* tmp = iParameterQueue[ iTail ];

   102     // Set additional info for send frame

   103     tmp->iChannelId = aId;

   104     

   105     tmp->iChannelPtr = aChannelPtr;

   106 

   107     tmp->iFrameInfo = aFrameInfo;

   108 

   109     /* adjust tail pointer */

   110     iTail = ++iTail % iSize;

   111 

   112     /* remember the amount of the requests in the queue */

   113     iCount++;

   114 

   115     RestoreIrqs( irqLevel );

   116 

   117     return KErrNone;

   118     }

   119 

   120 // -----------------------------------------------------------------------------

   121 // DIscSendQueue::GetFirstFrameInfo

   122 // Returns a frist frame info from list.

   123 // (other items were commented in a header).

   124 // -----------------------------------------------------------------------------

   125 //

   126 EXPORT_C TIscSendFrameInfo* DIscSendQueue::GetFirstFrameInfo()

   127     {

   128     E_TRACE( ( _T( "ISQ:G(%d, 0x%x)" ), iCount, iQueue ) );

   129 

   130     TIscSendFrameInfo* result;

   131 

   132     TInt irqLevel = DisableIrqs();

   133 

   134     if ( iCount == 0 || iSize == 0 )

   135         {

   136         RestoreIrqs( irqLevel );

   137         return NULL;

   138         }

   139 

   140     result = iParameterQueue[ iHead ];

   141     

   142     RestoreIrqs( irqLevel );

   143 

   144     return result;

   145     }

   146