/****************************************************************************   (c) SYSTEC electronic GmbH, D-07973 Greiz, August-Bebel-Str. 29      www.systec-electronic.com   Project:      openPOWERLINK   Description:  source file for EPL User Timermodule for Linux kernel module   License:     Redistribution and use in source and binary forms, with or without    modification, are permitted provided that the following conditions    are met:     1. Redistributions of source code must retain the above copyright       notice, this list of conditions and the following disclaimer.     2. Redistributions in binary form must reproduce the above copyright       notice, this list of conditions and the following disclaimer in the       documentation and/or other materials provided with the distribution.     3. Neither the name of SYSTEC electronic GmbH nor the names of its       contributors may be used to endorse or promote products derived       from this software without prior written permission. For written       permission, please contact info@systec-electronic.com.     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE    COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,    BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE    POSSIBILITY OF SUCH DAMAGE.     Severability Clause:         If a provision of this License is or becomes illegal, invalid or        unenforceable in any jurisdiction, that shall not affect:        1. the validity or enforceability in that jurisdiction of any other           provision of this License; or        2. the validity or enforceability in other jurisdictions of that or           any other provision of this License.   -------------------------------------------------------------------------                 $RCSfile: EplTimeruLinuxKernel.c,v $                 $Author: D.Krueger $                 $Revision: 1.6 $  $Date: 2008/04/17 21:36:32 $                 $State: Exp $                 Build Environment:                KEIL uVision 2   -------------------------------------------------------------------------   Revision History:   2006/09/12 d.k.:   start of the implementation ****************************************************************************/ #include "user/EplTimeru.h"#include <linux/timer.h> /***************************************************************************//*                                                                         *//*                                                                         *//*          G L O B A L   D E F I N I T I O N S                            *//*                                                                         *//*                                                                         *//***************************************************************************/ //---------------------------------------------------------------------------// const defines//--------------------------------------------------------------------------- //---------------------------------------------------------------------------// local types//---------------------------------------------------------------------------typedef struct {	struct timer_list m_Timer;	tEplTimerArg TimerArgument; } tEplTimeruData; //---------------------------------------------------------------------------// modul globale vars//--------------------------------------------------------------------------- //---------------------------------------------------------------------------// local function prototypes//---------------------------------------------------------------------------static void EplTimeruCbMs(unsigned long ulParameter_p); /***************************************************************************//*                                                                         *//*                                                                         *//*          C L A S S  <Epl Userspace-Timermodule for Linux Kernel>              *//*                                                                         *//*                                                                         *//***************************************************************************///// Description: Epl Userspace-Timermodule for Linux Kernel/////***************************************************************************/ //=========================================================================////                                                                         ////          P U B L I C   F U N C T I O N S                                ////                                                                         ////=========================================================================// //---------------------------------------------------------------------------//// Function:    EplTimeruInit//// Description: function inits first instance//// Parameters:  void//// Returns:     tEplKernel  = errorcode//// State:////--------------------------------------------------------------------------- tEplKernel EplTimeruInit(void){	tEplKernel Ret; 	Ret = EplTimeruAddInstance(); 	return Ret;} //---------------------------------------------------------------------------//// Function:    EplTimeruAddInstance//// Description: function inits additional instance//// Parameters:  void//// Returns:     tEplKernel  = errorcode//// State:////--------------------------------------------------------------------------- tEplKernel EplTimeruAddInstance(void){	tEplKernel Ret; 	Ret = kEplSuccessful; 	return Ret;} //---------------------------------------------------------------------------//// Function:    EplTimeruDelInstance//// Description: function deletes instance//              -> under Linux nothing to do//              -> no instance table needed//// Parameters:  void//// Returns:     tEplKernel  = errorcode//// State:////--------------------------------------------------------------------------- tEplKernel EplTimeruDelInstance(void){	tEplKernel Ret; 	Ret = kEplSuccessful; 	return Ret;} //---------------------------------------------------------------------------//// Function:    EplTimeruSetTimerMs//// Description: function creates a timer and returns the corresponding handle//// Parameters:  pTimerHdl_p = pointer to a buffer to fill in the handle//              ulTime_p    = time for timer in ms//              Argument_p  = argument for timer//// Returns:     tEplKernel  = errorcode//// State:////--------------------------------------------------------------------------- tEplKernel EplTimeruSetTimerMs(tEplTimerHdl *pTimerHdl_p,			       unsigned long ulTime_p,			       tEplTimerArg Argument_p){	tEplKernel Ret = kEplSuccessful;	tEplTimeruData *pData; 	// check pointer to handle	if (pTimerHdl_p == NULL) {		Ret = kEplTimerInvalidHandle;		goto Exit;	} 	pData = (tEplTimeruData *) EPL_MALLOC(sizeof(tEplTimeruData));	if (pData == NULL) {		Ret = kEplNoResource;		goto Exit;	} 	init_timer(&pData->m_Timer);	pData->m_Timer.function = EplTimeruCbMs;	pData->m_Timer.data = (unsigned long)pData;	pData->m_Timer.expires = jiffies + ulTime_p * HZ / 1000; 	EPL_MEMCPY(&pData->TimerArgument, &Argument_p, sizeof(tEplTimerArg)); 	add_timer(&pData->m_Timer); 	*pTimerHdl_p = (tEplTimerHdl) pData;       Exit:	return Ret;} //---------------------------------------------------------------------------//// Function:    EplTimeruModifyTimerMs//// Description: function changes a timer and returns the corresponding handle//// Parameters:  pTimerHdl_p = pointer to a buffer to fill in the handle//              ulTime_p    = time for timer in ms//              Argument_p  = argument for timer//// Returns:     tEplKernel  = errorcode//// State:////--------------------------------------------------------------------------- tEplKernel EplTimeruModifyTimerMs(tEplTimerHdl *pTimerHdl_p,				  unsigned long ulTime_p,				  tEplTimerArg Argument_p){	tEplKernel Ret = kEplSuccessful;	tEplTimeruData *pData; 	// check pointer to handle	if (pTimerHdl_p == NULL) {		Ret = kEplTimerInvalidHandle;		goto Exit;	}	// check handle itself, i.e. was the handle initialized before	if (*pTimerHdl_p == 0) {		Ret = EplTimeruSetTimerMs(pTimerHdl_p, ulTime_p, Argument_p);		goto Exit;	}	pData = (tEplTimeruData *) * pTimerHdl_p;	if ((tEplTimeruData *) pData->m_Timer.data != pData) {		Ret = kEplTimerInvalidHandle;		goto Exit;	} 	mod_timer(&pData->m_Timer, (jiffies + ulTime_p * HZ / 1000)); 	// copy the TimerArg after the timer is restarted,	// so that a timer occured immediately before mod_timer	// won't use the new TimerArg and	// therefore the old timer cannot be distinguished from the new one.	// But if the new timer is too fast, it may get lost.	EPL_MEMCPY(&pData->TimerArgument, &Argument_p, sizeof(tEplTimerArg)); 	// check if timer is really running	if (timer_pending(&pData->m_Timer) == 0) {	// timer is not running		// retry starting it		add_timer(&pData->m_Timer);	}	// set handle to pointer of tEplTimeruData//    *pTimerHdl_p = (tEplTimerHdl) pData;       Exit:	return Ret;} //---------------------------------------------------------------------------//// Function:    EplTimeruDeleteTimer//// Description: function deletes a timer//// Parameters:  pTimerHdl_p = pointer to a buffer to fill in the handle//// Returns:     tEplKernel  = errorcode//// State:////--------------------------------------------------------------------------- tEplKernel EplTimeruDeleteTimer(tEplTimerHdl *pTimerHdl_p){	tEplKernel Ret = kEplSuccessful;	tEplTimeruData *pData; 	// check pointer to handle	if (pTimerHdl_p == NULL) {		Ret = kEplTimerInvalidHandle;		goto Exit;	}	// check handle itself, i.e. was the handle initialized before	if (*pTimerHdl_p == 0) {		Ret = kEplSuccessful;		goto Exit;	}	pData = (tEplTimeruData *) * pTimerHdl_p;	if ((tEplTimeruData *) pData->m_Timer.data != pData) {		Ret = kEplTimerInvalidHandle;		goto Exit;	} /*    if (del_timer(&pData->m_Timer) == 1)    {        kfree(pData);    }*/	// try to delete the timer	del_timer(&pData->m_Timer);	// free memory in any case	kfree(pData); 	// uninitialize handle	*pTimerHdl_p = 0;       Exit:	return Ret; } //---------------------------------------------------------------------------//// Function:    EplTimeruIsTimerActive//// Description: checks if the timer referenced by the handle is currently//              active.//// Parameters:  TimerHdl_p  = handle of the timer to check//// Returns:     BOOL        = TRUE, if active;//                            FALSE, otherwise//// State:////--------------------------------------------------------------------------- BOOL EplTimeruIsTimerActive(tEplTimerHdl TimerHdl_p){	BOOL fActive = FALSE;	tEplTimeruData *pData; 	// check handle itself, i.e. was the handle initialized before	if (TimerHdl_p == 0) {	// timer was not created yet, so it is not active		goto Exit;	}	pData = (tEplTimeruData *) TimerHdl_p;	if ((tEplTimeruData *) pData->m_Timer.data != pData) {	// invalid timer		goto Exit;	}	// check if timer is running	if (timer_pending(&pData->m_Timer) == 0) {	// timer is not running		goto Exit;	} 	fActive = TRUE;       Exit:	return fActive;} //=========================================================================////                                                                         ////          P R I V A T E   F U N C T I O N S                              ////                                                                         ////=========================================================================// //---------------------------------------------------------------------------//// Function:    EplTimeruCbMs//// Description: function to process timer//////// Parameters:  lpParameter = pointer to structur of type tEplTimeruData////// Returns:     (none)////// State:////---------------------------------------------------------------------------static void EplTimeruCbMs(unsigned long ulParameter_p){	tEplKernel Ret = kEplSuccessful;	tEplTimeruData *pData;	tEplEvent EplEvent;	tEplTimerEventArg TimerEventArg; 	pData = (tEplTimeruData *) ulParameter_p; 	// call event function	TimerEventArg.m_TimerHdl = (tEplTimerHdl) pData;	TimerEventArg.m_ulArg = pData->TimerArgument.m_ulArg; 	EplEvent.m_EventSink = pData->TimerArgument.m_EventSink;	EplEvent.m_EventType = kEplEventTypeTimer;	EPL_MEMSET(&EplEvent.m_NetTime, 0x00, sizeof(tEplNetTime));	EplEvent.m_pArg = &TimerEventArg;	EplEvent.m_uiSize = sizeof(TimerEventArg); 	Ret = EplEventuPost(&EplEvent); 	// d.k. do not free memory, user has to call EplTimeruDeleteTimer()	//kfree(pData); } // EOF