shortlinkconn_plat/generic_hid_api/inc/hidinterfaces.h
branchRCL_3
changeset 39 4096754ee773
parent 38 3dcb815346df
child 40 52a167391590
equal deleted inserted replaced
38:3dcb815346df 39:4096754ee773
     1 /*
       
     2 * Copyright (c) 2004-2007 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:  Declares main application class.
       
    15 *
       
    16 */
       
    17 
       
    18 
       
    19 
       
    20 #ifndef C_HIDDRIVER_H
       
    21 #define C_HIDDRIVER_H
       
    22 
       
    23 #include <ecom/ecom.h>
       
    24 
       
    25 
       
    26 class CReportRoot;
       
    27 class MDriverAccess;
       
    28 class MTransportLayer;
       
    29 class CHidDriver;
       
    30 // ----------------------------------------------------------------------
       
    31 
       
    32 // Return codes from the Generic HID to Transport layers
       
    33 //
       
    34 const TInt KErrHidBase = -8000;
       
    35 
       
    36 const TInt KErrHidNoDriver = KErrHidBase;           /*!< No driver could be found to handle the request */
       
    37 const TInt KErrHidSuspended = KErrHidBase - 1;      /*!< Command not handled - driver is suspended */
       
    38 const TInt KErrHidUnrecognised = KErrHidBase - 2;   /*!< Driver could not understand the data */
       
    39 const TInt KErrHidUnexpected = KErrHidBase - 3;     /*!< Unsolicited data from the device */
       
    40 const TInt KErrHidBadChannel = KErrHidBase - 4;     /*!< Channel was not Int or Ctrl type */
       
    41 const TInt KErrHidPartialSupported = KErrHidBase - 5;     /*!< Partil supported hid device */
       
    42 
       
    43 // Errors returned by the report translator / generator:
       
    44 //
       
    45 const TInt KErrUsageNotFound = KErrHidBase - 10;    //!< Usage page/ID wasn't found in the field
       
    46 const TInt KErrValueOutOfRange = KErrHidBase - 11;  //!< Value specified is outside the logical range
       
    47 const TInt KErrNoSpaceInArray = KErrHidBase - 12;   //!< Array field already contains the maximum number of values
       
    48 const TInt KErrBadControlIndex = KErrHidBase - 13;  //!< Control index exceeds the number of controls in the field
       
    49 
       
    50 // ACK codes returned by Set/Get requests to the devices
       
    51 //
       
    52 const TInt KErrCommandAckBase = -8100;
       
    53 
       
    54 const TInt KErrAckInvalidReportID = KErrCommandAckBase;         /*!< Invalid report ID */
       
    55 const TInt KErrAckInvalidParameter = KErrCommandAckBase - 1;    /*!< Invalid or out of range param */
       
    56 const TInt KErrAckUnknown = KErrCommandAckBase - 2;             /*!< Command failed, but the device can't determine why */
       
    57 const TInt KErrAckFatal = KErrCommandAckBase - 3;               /*!< The device is in an unrecoverable state and must be restarted */
       
    58 
       
    59 // Constant for plugin interface:
       
    60 const TUid KHidDriverPluginInterfaceUid        = { 0x10201d26 };
       
    61 
       
    62 
       
    63 class THidEvent
       
    64     {
       
    65     public:
       
    66     /**
       
    67      * Usage page
       
    68      */
       
    69     TInt iUsagePage;
       
    70     
       
    71     /**
       
    72      * Keycode
       
    73      */
       
    74     TInt iKeyCode;
       
    75     };
       
    76 
       
    77 class CHidInputDataHandlingReg: public CBase
       
    78     {
       
    79        
       
    80 public:
       
    81     /**
       
    82      * Two-phased constructor.     
       
    83      */
       
    84     static CHidInputDataHandlingReg* NewL();
       
    85 
       
    86     /**
       
    87      * Destructor
       
    88      */
       
    89      virtual ~CHidInputDataHandlingReg(); 
       
    90 
       
    91 public:        
       
    92         
       
    93     /**
       
    94      * Check if key event is not allready processed
       
    95      *
       
    96      * @since S60 v5.0
       
    97      * @param aUsagePage a usage page to be checked
       
    98      * @param aUsage a usage code to be checked
       
    99      * @return true if event is not allready handled
       
   100      */
       
   101     IMPORT_C TBool  AllowedToHandleEvent(TInt aUsagePage, TInt aUsage);
       
   102     
       
   103     
       
   104     /**
       
   105      * Add handled event
       
   106      *
       
   107      * @since S60 v5.0
       
   108      * @param aUsagePage usage page to be handled
       
   109      * @param aUsage Usage to be handled
       
   110      * @return None.
       
   111      */ 
       
   112     IMPORT_C void  AddHandledEvent( TInt aUsagePage, TInt aUsage);
       
   113     
       
   114     /**
       
   115      * Reset Array 
       
   116      */
       
   117     void  Reset();
       
   118     
       
   119 private:
       
   120     
       
   121     CHidInputDataHandlingReg();
       
   122     void ConstructL();
       
   123 
       
   124 private: 
       
   125     
       
   126     /**
       
   127      * Event array
       
   128      * Own.
       
   129      */
       
   130     CArrayFixFlat<THidEvent>* iEventArray;
       
   131     
       
   132     };
       
   133 
       
   134 /**
       
   135  *
       
   136  *  Transport layer interface class
       
   137  *  Interface allowing the generic HID layer to pass data to a Transport layer
       
   138  *  All commands are asynchronous.  The results are returned via the
       
   139  *
       
   140  *  @since S60 v5.0
       
   141  */
       
   142 class MTransportLayer
       
   143     {
       
   144 public:
       
   145 
       
   146     /**
       
   147      * Request for the country code of the given device.
       
   148      *
       
   149      * @since S60 v5.0
       
   150      * @param aConnID The device identifier
       
   151      * @return country code.
       
   152      */
       
   153     virtual TUint CountryCodeL(TInt aConnID) = 0;
       
   154 
       
   155     /**
       
   156      * Request for the vendor identifier for the given device.
       
   157      *
       
   158      * @since S60 v5.0
       
   159      * @param aConnID The device identifier
       
   160      * @return vendor id.
       
   161      */
       
   162     virtual TUint VendorIdL(TInt aConnID) = 0;
       
   163 
       
   164     /**
       
   165      * Request for the product identifier for the given device.
       
   166      *
       
   167      * @since S60 v5.0
       
   168      * @param aConnID The device identifier
       
   169      * @return product id.
       
   170      */
       
   171     virtual TUint ProductIdL(TInt aConnID) = 0;
       
   172 
       
   173     /**
       
   174      * Request for the current device report protocol. The protocol will be
       
   175      * received as a control report via the CHidTransport::DataIn function
       
   176      *
       
   177      * @since S60 v5.0
       
   178      * @param aConnID The device identifier
       
   179      * @param aInterface The interface we want to get the protocol from
       
   180      * @return None.
       
   181      */
       
   182     virtual void GetProtocolL(TInt aConnID,  TUint16 aInterface) = 0;
       
   183 
       
   184     /**
       
   185      * Request to put the device in the specified protocol
       
   186      *
       
   187      * @since S60 v5.0
       
   188      * @param aConnID The device identifier
       
   189      * @param aValue The requested protocol for the device (boot or report)
       
   190      * @param aInterface The interface we want to set the protocol for
       
   191      * @return None.
       
   192      */
       
   193     virtual void SetProtocolL(TInt aConnID, TUint16 aValue,
       
   194         TUint16 aInterface) = 0;
       
   195 
       
   196     /**
       
   197      * Request for a device report. The data will be received as a control report
       
   198      * via the CHidTransport::DataIn function
       
   199      *
       
   200      * @since S60 v5.0
       
   201      * @param aConnID The device identifier
       
   202      * @param aReportType The type of report (input/output/feature) requested
       
   203      * @param aReportID The specific report required
       
   204      * @param aInterface The interface we want the report from
       
   205      * @param aLength The expected length of the report buffer
       
   206      * @return None.
       
   207      */
       
   208     virtual void GetReportL(TInt aConnID, TUint8 aReportType,TUint8 aReportID,
       
   209         TUint16 aInterface, TUint16 aLength) = 0;
       
   210 
       
   211     /**
       
   212      * Request to send a report to a device. The response will be reported via the
       
   213      * CHidTransport::CommandResult function
       
   214      *
       
   215      * @since S60 v5.0
       
   216      * @param aConnID The device identifier
       
   217      * @param aReportType The type of report (input/output/feature) requested
       
   218      * @param aReportID The specific report required to set
       
   219      * @param aInterface The interface we want to send the report to
       
   220      * @param aReport The report payload to be sent to the device
       
   221      * @return None.
       
   222      */
       
   223     virtual void SetReportL(TInt aConnID, TUint8 aReportType,TUint8 aReportID,
       
   224         TUint16 aInterface, const TDesC8& aReport) = 0;
       
   225 
       
   226     /**
       
   227      * Request to send data to a device. There are no responses to this report from device.
       
   228      *
       
   229      * @since S60 v5.0
       
   230      * @param aConnID The device identifier
       
   231      * @param aReportID The specific report required
       
   232      * @param aInterface The interface we want to send the report to
       
   233      * @param aReport The report payload to be sent to the device
       
   234      * @return None.
       
   235      */
       
   236     virtual void DataOutL(TInt aConnID, TUint8 aReportID,
       
   237         TUint16 aInterface, const TDesC8& aReport) = 0;
       
   238 
       
   239     /**
       
   240      * Request for the current idle rate of a report from the device. The response
       
   241      * will be recevied via the CHidTransport::DataIn function
       
   242      *
       
   243      * @since S60 v5.0
       
   244      * @param aConnID The device identifier
       
   245      * @param aReportID The specific report to be queried
       
   246      * @param aInterface The interface we want to query for idle rate
       
   247      * @return None.
       
   248      */
       
   249     virtual void GetIdleL(TInt aConnID, TUint8 aReportID,
       
   250         TUint16 aInterface) = 0;
       
   251 
       
   252     /**
       
   253      * Request to set the current idle rate for a report on the device.
       
   254      * The response will be received via the CHidTransport::CommandResult function
       
   255      *
       
   256      * @since S60 v5.0
       
   257      * @param aConnID The device identifier
       
   258      * @param aReportID The specific report to be queried
       
   259      * @param aDuration The time period between idle reports (4ms per bit. An
       
   260      *        interval of 0 disables idle reports so that Interrupt reports are only ever
       
   261      *        received when the reported data has changed
       
   262      * @param aReportID The specific report to be queried
       
   263      * @param aInterface The interface we want to query for idle rate
       
   264      * @return None.
       
   265      */
       
   266     virtual void SetIdleL(TInt aConnID,  TUint8 aDuration, TUint8 aReportID,
       
   267         TUint16 aInterface) = 0;
       
   268     };
       
   269 
       
   270 /**
       
   271  *
       
   272  *  Driver access interface
       
   273  *  Interface allowing drivers to request data from and send data to devices via
       
   274  *  the Generic HID layer.
       
   275  *
       
   276  *  @since S60 v5.0
       
   277  */
       
   278 class MDriverAccess
       
   279     {
       
   280 public:
       
   281 
       
   282     /**
       
   283      * The type of report requested from the device
       
   284      * Note: The enumeration values map directly to the HID equivalent values
       
   285      * (Passed as TUint16 values to the transport layer)
       
   286      */
       
   287     enum TReportType
       
   288         {
       
   289         EInput=1,     /*!< Input report */
       
   290         EOutput,      /*!< Output report */
       
   291         EFeature      /*!< Feature report */
       
   292         };
       
   293 
       
   294     /** Return codes from the Generic HID to the device drivers
       
   295      * Note: The enumeration values map directly to the HID equivalent values
       
   296      *(Passed as TUint8 values to the transport layer)
       
   297      */
       
   298 
       
   299     enum TProtocols
       
   300         {
       
   301         EBoot=0,        /*!< Boot Protocol */
       
   302         EReport=1       /*!< Report Protocol */
       
   303         };
       
   304 
       
   305 public:
       
   306 
       
   307     /**
       
   308      * Retrieves the country code for the HID device
       
   309      *
       
   310      * @since S60 v5.0
       
   311      * @param aConnID The device identifier
       
   312      * @return contry code
       
   313      */
       
   314     virtual TUint CountryCodeL(TInt aConnID) = 0;
       
   315 
       
   316     /**
       
   317      * Retrieves the  for the HID device
       
   318      *
       
   319      * @since S60 v5.0
       
   320      * @param aConnID The device identifier
       
   321      * @return vendor id
       
   322      */
       
   323     virtual TUint VendorIdL(TInt aConnID) = 0;
       
   324 
       
   325     /**
       
   326      * Retrieves the product identifier for the HID device
       
   327      *
       
   328      * @since S60 v5.0
       
   329      * @param aConnID The device identifier
       
   330      * @return produrct id
       
   331      */
       
   332     virtual TUint ProductIdL(TInt aConnID) = 0;
       
   333 
       
   334     /**
       
   335      * Requests the current protocol for the device (boot or report)
       
   336      * Leaves whit KErrInUse The request was not successful because the transport 
       
   337      * layer is busy with previous request and KErrNotReady The request failed 
       
   338      * because the device is currently unavaila
       
   339      *
       
   340      * @since S60 v5.0
       
   341      * @param aConnectionID The connection id
       
   342      * @param aInterface The current interface being used by the driver
       
   343      * @return None.
       
   344      */
       
   345     virtual void GetProtocolL(TInt aConnectionID,
       
   346         TUint16 aInterface) = 0;
       
   347 
       
   348     /**
       
   349      * Requests a report from the device
       
   350      * Leaves whit KErrInUse The request was not successful because the transport 
       
   351      * layer is busy with previous request and KErrNotReady The request failed 
       
   352      * because the device is currently unavailable
       
   353      *
       
   354      * @since S60 v5.0
       
   355      * @param aConnectionId The connection id
       
   356      * @param aReportId The report required from the device
       
   357      * @param aInterface The current interface being used by the driver
       
   358      * @param aLength ** NOT USED **
       
   359      * @return None
       
   360      */
       
   361     virtual void GetReportL(TInt aConnectionId, TUint8 aReportId,
       
   362         TUint16 aInterface, TUint16 aLength) = 0;
       
   363 
       
   364     /**
       
   365      * Requests the current Idle setting for the device
       
   366      * Leaves whit KErrInUse The request was not successful because the transport 
       
   367      * layer is busy with previous request and KErrNotReady The request failed 
       
   368      * because the device is currently unavailable
       
   369      *
       
   370      * @since S60 v5.0
       
   371      * @param aConnectionId The device ID
       
   372      * @param aReportId The report required from the device
       
   373      * @param aInterface The current interface being used by the driver
       
   374      * @return None.
       
   375      */
       
   376     virtual void GetIdleL(TInt aConnectionId, TUint8 aReportId,
       
   377         TUint16 aInterface ) = 0;
       
   378 
       
   379     /**
       
   380      * Sets the protocol to be used for reports
       
   381      * Leaves whit KErrInUse The request was not successful because the transport 
       
   382      * layer is busy with previous request and KErrNotReady The request failed 
       
   383      * because the device is currently unavailable
       
   384      *
       
   385      * @since S60 v5.0
       
   386      * @param aConnectionId The device ID
       
   387      * @param aInterface The current interface being used by the driver
       
   388      * @param aProtocol The required protocol (boot or report)
       
   389      * @parem aDriver Calling driver
       
   390      * @return None.
       
   391      */
       
   392     virtual void SetProtocolL(TInt aConnectionId,
       
   393         TUint16 aInterface, TProtocols aProtocol, CHidDriver* aDriver) = 0;
       
   394 
       
   395     /**
       
   396      * Sets the idle interval for interrupt data.
       
   397      * Leaves whit KErrInUse The request was not successful because the transport 
       
   398      * layer is busy with previous request and KErrNotReady The request failed 
       
   399      * because the device is currently unavailable
       
   400      *
       
   401      * @since S60 v5.0
       
   402      * @param aConnectionId The device ID
       
   403      * @param aDuration The idle interval, in steps of 0.04ms intervals (where
       
   404      *                  1 = 0.04ms, 2=0.08ms). 0 will disable idle so reports
       
   405      *                   are only sent when the state of the device changes
       
   406      * @param aInterface The current interface being used by the driver
       
   407      * @param aReportId The report whose idle rate is being set
       
   408      * @param aInterface The current interface being used by the driver
       
   409      * @parem aDriver Calling driver
       
   410      * @return None.
       
   411      */
       
   412     virtual void SetIdleL(TInt aConnectionId, TUint8 aDuration,
       
   413         TUint8 aReportId, TUint16 aInterface, CHidDriver* aDriver) = 0;
       
   414 
       
   415 
       
   416     /**
       
   417      * Sends a report to the device
       
   418      *
       
   419      * @since S60 v5.0
       
   420      * @param aConnectionId The device ID
       
   421      * @param aReportId The report to receive the setup report
       
   422      * @param aReportType The type of report being sent to the device (input, output
       
   423      *                     or Feature)
       
   424      * @param aPayload The report being sent to the device
       
   425      * @parem aDriver Calling driver
       
   426      * @param aInterface The current interface being used by the driver
       
   427      * @return KErrNone The request was successful and the result of the command is
       
   428      *         expected at a later time (as a CmdAck message), KErrInUse The request
       
   429      *         was not successful because the transport layer is busy with a previous
       
   430      *         request, KErrNotReady The request failed because the device is currently
       
   431      *         unavailable and KErrNoMemory The request failed because not enough memory
       
   432      *         available
       
   433      */
       
   434     virtual void SetReportL(TInt aConnectionId, TUint8 aReportId,
       
   435         TReportType aReportType, const TDesC8& aPayload,
       
   436         TUint16 aInterface, CHidDriver* aDriver) = 0;
       
   437 
       
   438     /**
       
   439      * Sends a report to the device (from host) using Interrupt Channel as DATA
       
   440      *
       
   441      * @since S60 v5.0
       
   442      * @param aConnectionId The device ID
       
   443      * @param aReportId The report to receive the setup report
       
   444      * @param aPayload The report being sent to the device
       
   445      * @param aInterface The current interface being used by the driver
       
   446      * @return KErrNone The request was successful and the result of the
       
   447      *         command is expected at a later time (as a CmdAck message),
       
   448      *         KErrInUse The request was not successful because the transport layer is
       
   449      *         busy with a previous request, KErrNotReady The request failed because the
       
   450      *         device is currently unavailable and KErrNoMemory The request failed because
       
   451      *         not enough memory available
       
   452      */
       
   453     virtual void DataOutL(TInt aConnectionId, TUint8 aReportId,
       
   454         /*TReportType aReportType,*/ const TDesC8& aPayload,
       
   455         TUint16 aInterface) = 0;
       
   456 
       
   457     /**
       
   458      * A request for the parsed descriptor container object so the driver can
       
   459      * retrieve the report format(s)
       
   460      *
       
   461      * @since S60 v5.0
       
   462      * @param aConnectionId The device ID
       
   463      * @return A pointer to the parsed report descriptor container and
       
   464      *        NULL if no parsed report descriptor container exists
       
   465      */
       
   466     virtual CReportRoot* ReportDescriptor(TInt aConnectionId) = 0;
       
   467     };
       
   468 
       
   469 
       
   470 /**
       
   471  *
       
   472  *  Hid transport interface
       
   473  *  Interface allowing the transport layer to pass data to the Generic HID
       
   474  *
       
   475  *  @since S60 v5.0
       
   476  */
       
   477 class CHidTransport : public CBase
       
   478     {
       
   479 public:
       
   480     /**
       
   481      * Defines the channel type for the DataIn function
       
   482      */
       
   483     enum THidChannelType
       
   484         {
       
   485         EHidChannelInt,     /*!< Interrupt channel */
       
   486         EHidChannelCtrl     /*!< Control channel */
       
   487         };
       
   488 
       
   489     /**
       
   490      *Driver state (active or suspended)
       
   491      */
       
   492     enum TDriverState
       
   493         {
       
   494         EActive,            /*!< Driver will handle interrupt data */
       
   495         ESuspend            /*!< the driver will not handle interrupt data */
       
   496         };
       
   497 
       
   498 public:
       
   499 
       
   500     /**
       
   501      * Called when a device has connected
       
   502      *
       
   503      * @since S60 v5.0
       
   504      * @param aConnectionId The transport-layer enumeration for the connection
       
   505      * @param aDescriptor The report descriptor for the device
       
   506      * @return KErrNone The connection will be handled by one or more drivers,
       
   507      *         KErrHidNoDriver No driver was found to handle the connected device
       
   508      */
       
   509     virtual TInt ConnectedL(TInt aConnectionId, const TDesC8& aDescriptor) = 0;
       
   510 
       
   511     /**
       
   512      * Called when a device has been disconnected
       
   513      *
       
   514      * @since S60 v5.0
       
   515      * @param aConnectionId The transport-layer enumeration for the connection
       
   516      * @param aDescriptor The report descriptor for the device
       
   517      * @return KErrNone The device was recognised and its drivers were unloaded and
       
   518      *         KErrHidNoDriver No driver was found to handle the connected device
       
   519      */
       
   520     virtual TInt Disconnected(TInt aConnectionId) = 0;
       
   521 
       
   522     /**
       
   523      * Called when a device has been disconnected
       
   524      *
       
   525      * @since S60 v5.0
       
   526      * @param aConnectionId Transport layer connection enumeration
       
   527      * @param aChannel Channel ID (Interrupt or Control)
       
   528      * @param aPayload The complete report payload
       
   529      * @return KErrNone The payload was handled by one or more drivers,
       
   530      *         KErrHidNoDriver No driver is handling reports from the device
       
   531      *         and KErrHidSuspended The report was not handled because all the drivers
       
   532      *         handling the device are suspended
       
   533      */
       
   534     virtual TInt DataIn(TInt aConnectionId,
       
   535         THidChannelType aChannel, const TDesC8& aPayload) = 0;
       
   536 
       
   537     /**
       
   538      * Suspends or Resumes the driver(s) handling the connection
       
   539      *
       
   540      * @since S60 v5.0
       
   541      * @param aConnectionId Transport layer connection enumeration
       
   542      * @param aActive The requested state of the driver (active or suspended)
       
   543      * @return KErrNone The driver was successfully put into the requested state,
       
   544      *         and KErrHidAlreadyInState All the drivers were already in the
       
   545      *         requested state
       
   546      */
       
   547     virtual TInt DriverActive(TInt aConnectionId,
       
   548         CHidTransport::TDriverState aActive) = 0;
       
   549 
       
   550     /**
       
   551      * Called by the transport layers to inform the generic HID of the
       
   552      * success of the last Set... command.
       
   553      *
       
   554      * @since S60 v5.0
       
   555      * @param aConnectionId Transport layer connection enumeration
       
   556      * @param  aCmdAck Status of the last Set... command
       
   557      * @return None.
       
   558      */
       
   559     virtual void CommandResult(TInt aConnectionId, TInt aCmdAck) = 0;
       
   560     };
       
   561 
       
   562 /**
       
   563  *
       
   564  *  Driver plugin interface
       
   565  *  Interface allowing drivers to request data from and send data to devices via
       
   566  *  the Generic HID layer.
       
   567  *
       
   568  *  @lib generichid.lib 
       
   569  *  @since S60 v5.0
       
   570  */
       
   571 class CHidDriver : public CBase
       
   572     {
       
   573 public:
       
   574 
       
   575 
       
   576     /**
       
   577      * Two-phased constructor.
       
   578      * @param aImplementationUid Implementation UID of the plugin to be
       
   579      *                           created.
       
   580      * @param aHid               Driver acces interface
       
   581      */
       
   582     IMPORT_C static CHidDriver* NewL(
       
   583 	    const TUid aImplementationUid,
       
   584     	MDriverAccess* aHid );
       
   585 
       
   586     /**
       
   587      * Destructor
       
   588      */
       
   589      IMPORT_C virtual ~CHidDriver();
       
   590 
       
   591     /**
       
   592      * Called by the Generic HID to see if the factory can use reports described by
       
   593      * the parsed report descriptor
       
   594      * NOTE: The current implementation supports just one driver and that driver
       
   595      * that will either handle all the reports from the device or none at all.
       
   596      * Report ID is not currently being taken into account.
       
   597      *
       
   598      * @since S60 v5.0
       
   599      * @param aReportDescriptor Parsed HID report descriptor
       
   600      * @return KErrNone The driver will handle reports from the report descriptor and
       
   601      *         KErrHidUnrecognised The driver cannot handle reports from the device
       
   602      */
       
   603     virtual TInt CanHandleReportL(CReportRoot* aReportDescriptor) = 0;
       
   604 
       
   605     /**
       
   606      * Called by the Generic HID layer when a device has sent a report on the
       
   607      * interrupt or control channel
       
   608      *
       
   609      * @since S60 v5.0
       
   610      * @param aChannel Channel ID (Interrupt or Control)
       
   611      * @param aPayload The complete report payload
       
   612      * @return Error if data can't be handled.
       
   613      */
       
   614     virtual TInt DataIn(CHidTransport::THidChannelType aChannel,
       
   615         const TDesC8& aPayload) = 0;
       
   616 
       
   617     /**
       
   618      * Called by the Generic HID layer when the handled device has been disconnected
       
   619      * interrupt or control channel
       
   620      *
       
   621      * @since S60 v5.0
       
   622      * @param aReason Disconnection code
       
   623      * @return None.
       
   624      */
       
   625     virtual void Disconnected(TInt aReason) = 0;
       
   626 
       
   627     /**
       
   628      * Called after a driver is sucessfully created by the Generic HID,
       
   629      * when a device is connected.
       
   630      *
       
   631      * @since S60 v5.0
       
   632      * @param aConnectionId An number used to identify the device in
       
   633      * subsequent calls from the driver to the generic HID, for example
       
   634      * when sending data to the device.
       
   635      * @return None.
       
   636      */
       
   637     virtual void InitialiseL(TInt aConnectionId) = 0;
       
   638 
       
   639     /**
       
   640      * Enables the driver so that it will configure the device and
       
   641      * start handling interrupt reports from the device
       
   642      *
       
   643      * @since S60 v5.0
       
   644      * @param aConnectionId A number used to identify the device in
       
   645      * subsequent calls from the driver to the Generic HID, for example
       
   646      * when sending data to the device.
       
   647      * @return None.
       
   648      */
       
   649     virtual void StartL(TInt aConnectionId) = 0;
       
   650 
       
   651     /**
       
   652      * Disables the driver so that it will stop handling device
       
   653      * interrupt reports
       
   654      *
       
   655      * @since S60 v5.0
       
   656      * @return None.
       
   657      */
       
   658     virtual void Stop() = 0;
       
   659 
       
   660     /**
       
   661      * Called by the transport layers to inform the generic HID of
       
   662      * the success of the last Set... command.
       
   663      *
       
   664      * @since S60 v5.0
       
   665      * @param  aCmdAck Status of the last Set... command
       
   666      * @return None.
       
   667      */
       
   668     virtual void CommandResult(TInt aCmdAck) = 0;
       
   669     
       
   670     /**
       
   671      * Return count of supported fields
       
   672      *
       
   673      * @since S60 v5.0     
       
   674      * @return Number of supported fields.
       
   675      */
       
   676     virtual TInt SupportedFieldCount()= 0;
       
   677     
       
   678     
       
   679     /**
       
   680      * Set input handling registy 
       
   681      *
       
   682      * @since S60 v5.0     
       
   683      * @param aHandlingReg  a Input handling registry
       
   684      * @return Number of supported fields.
       
   685      */
       
   686     virtual void SetInputHandlingReg(CHidInputDataHandlingReg* aHandlingReg) = 0;
       
   687 
       
   688     protected:
       
   689     /**
       
   690      * C++ constructor.
       
   691      */
       
   692     IMPORT_C CHidDriver();
       
   693 
       
   694     private: // Data
       
   695 
       
   696     /**
       
   697      * ECOM plugin instance UID.
       
   698      */
       
   699     TUid iDtor_ID_Key;
       
   700     };
       
   701     
       
   702 #endif
       
   703 
       
   704