WinCE下的触控屏驱动程序源代码

// // Copyright (c) Microsoft Corporation. All rights reserved. // // // Use of this source code is subject to the terms of the Microsoft end-user // license agreement (EULA) under which you licensed this SOFTWARE PRODUCT. // If you did not accept the terms of the EULA, you are not authorized to use // this source code. For a copy of the EULA, please see the LICENSE.RTF on your // install media. // /*++ THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE. @doc EX_TOUCH_DDI INTERNAL DRIVERS MDD TOUCH_PANEL Module Name: @module mdd.c Abstract: This module contains the DDI implementation and the supporting administriva. if DBGCAL is defined, the results of the calibration calculations are displayed following the setting of calibration data. <nl> Functions: TouchPanelpDetach TouchPanelpAttach TouchPanelpISR TouchPanelGetDeviceCaps TouchPanelSetMode TouchPanelPowerHandler TouchPanelEnable TouchPanelDisable TouchPanelReadCalibrationPoint TouchPanelReadCalibrationAbort Notes: --*/ #include <windows.h> #include <types.h> #include <memory.h> #include <nkintr.h> #include <tchddi.h> #include <tchddsi.h> extern PFN_TOUCH_PANEL_CALLBACK v_pfnCgrPointCallback; extern PFN_TOUCH_PANEL_CALLBACK v_pfnCgrCallback; // To track if we are in OOM state. BOOL _bTchThreadHighPriority = FALSE; // // Run at high priority so that we can service our interrupts quickly. // #define DEFAULT_THREAD_PRIORITY 109 #define DEFAULT_THREAD_HIGH_PRIORITY 109 #define CAL_DELTA_RESET 20 #define CAL_HOLD_STEADY_TIME 1500 // If we are a DLL, we can define our dpCurSettings #ifdef DEBUG DBGPARAM dpCurSettings = { TEXT("Touch"), { TEXT("Samples"),TEXT("Calibrate"),TEXT("Stats"),TEXT("Thread"), TEXT("TipState"),TEXT("Init"),TEXT(""),TEXT(""), TEXT(""),TEXT("Misc"),TEXT("Delays"),TEXT("Timing"), TEXT("Alloc"),TEXT("Function"),TEXT("Warning"),TEXT("Error") }, 0xC020 // warning, error, init }; #endif // // Calibration State defintions // // @const LONG | CalibrationAvailable | // Indicates that calibration is not in progress and is available for use. // // @const LONG | CalibrationActive | // Indicates that calibration is active. // // @const LONG | CalibrationInactive | // Indicates that calibration is inactive and waiting for completion. // // @const LONG | CalibrationAborted | // Indicates that calibration is in the process of aborting via user request. // #define CalibrationInactive 0x00 #define CalibrationWaiting 0x01 #define CalibrationDown 0x02 #define CalibrationValid 0x03 #define CalibrationAborted 0x04 // Scale factor to support sub-pixel resolutions #define X_SCALE_FACTOR 4 #define Y_SCALE_FACTOR 4 // // Macro for absolute value. // #define ABS(x) ((x) >= 0 ? (x) : (-(x))) // // Internal Function Prototypes // static ULONG TouchPanelpISR( PVOID Reserved ); ULONG culReferenceCount; //@globalvar ULONG | culReferenceCount | Count of attached threads HANDLE hThread; //@globalvar HANDLE | hThread | Handle of attached thread CRITICAL_SECTION csMutex; //@globalvar CRITICAL_SECTION | csMutex | Critical section HANDLE hTouchPanelEvent; //@globalvar HANDLE | hTouchPanelEvent | Holds the event handle for // touch panel event notification. HANDLE hCalibrationSampleAvailable; //@globalvar HANDLE | hCalibrationSampleAvailable | Holds the event handle for // notification that a calibration // mapping point is available. INT CalibrationState; //@globalvar INT | CalibrationState | Flag which indicates the // state of calibration: Available, // Active or Inactive. static DWORD gThreadPriority; //@globalvar DWORD | gThreadPriority | Interrupt thread normal priority static DWORD gThreadHighPriority; //@globalvar DWORD | gThreadHighPriority | Interrupt thread high priority // The MIN_CAL_COUNT is defined in the PDD, since each touch panel // has different characteristics. The value should be high enough // to prevent spurious touches, but low enough that the user doesn't // have to hold the pen on each crosshair too long. extern int MIN_CAL_COUNT; LONG lCalibrationXCoord; //@globalvar LONG | lCalibrationXCoord | Holds the X coordinate // corresponding to the touch. LONG lCalibrationYCoord; //@globalvar LONG | lCalibrationYCoord | Holds the Y coordinate // corresponding to the touch. INT32 DisplayWidth; INT32 DisplayHeight; DWORD gdwTouchIstTimeout = INFINITE; // hold csMutex when accessing this // //@globalvar PFN_TOUCH_PANEL_CALLBACK | v_pfnPointCallback | // Pointer to the application supplied function for receiving points. // PFN_TOUCH_PANEL_CALLBACK v_pfnPointCallback; //********************************************************************** // The following routines are internal helpers, and are not visible to // the DDI layer. // @doc IN_TOUCH_DDI INTERNAL DRIVERS MDD TOUCH_PANEL //********************************************************************** /*++ Autodoc Information: @func VOID | TouchPanelpDetach | Performs cleanup and frees memory when owning process detaches. @devnote We let ExitProcess handle the shutting down of the ISR thread. --*/ static VOID TouchPanelpDetach( VOID ) { } /*++ Autodoc Information: @func BOOL | TouchPanelpAttach | This routine performs the initialization for the touch panel. @rdesc If the function succeeds the return value is TRUE, otherwise, it is FALSE. --*/ static BOOL TouchPanelpAttach( VOID ) { // // Create the event for touch panel events. // If creation fails, return failure. // hTouchPanelEvent = CreateEvent( NULL, FALSE, // Not manual reset FALSE, // Not signalled NULL ); if ( !hTouchPanelEvent ) return ( FALSE ); // // Create the event for signaling when a calibration sample has been sent. // hCalibrationSampleAvailable = CreateEvent( NULL, FALSE, // Not manual reset FALSE, // Not signalled NULL ); if ( !hCalibrationSampleAvailable ) return ( FALSE ); DdsiTouchPanelDisable(); // Insure the device is disabled // // Initialize the critical section, flags, callbacks, reference count, // sample rate. // InitializeCriticalSection( &csMutex ); CalibrationState = CalibrationInactive; v_pfnPointCallback = NULL; culReferenceCount = 0; // // Initialize calibration info used to convert uncalibrated to calibrated // points so that function is a noop. // TouchPanelSetCalibration( 0, NULL, NULL, NULL, NULL ); return ( TRUE ); } /*++ Autodoc Information: @func ULONG | TouchPanelpISR | This routine is the thread which handles touch panel events. The event that this thread synchronizes on is signaled by the PDD based on the sampling rate, typically 10ms. @rdesc Never returns. --*/ static ULONG TouchPanelpISR( PVOID Reserved //@parm Reserved, not used. ) { TOUCH_PANEL_