/****************************************************************************
(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:
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modification, are permitted provided that the following conditions
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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POSSIBILITY OF SUCH DAMAGE.
Severability Clause:
If a provision of this License is or becomes illegal, invalid or
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-------------------------------------------------------------------------
$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
