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/*
* Copyright (C) 2000 Karim Yaghmour <karym@opersys.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*****************************************************************
* File : rtai_tracer.c
* Description :
* Contains the code for the RTAI tracing driver.
* Author :
* karym@opersys.com
* Date :
* 16/05/00, Initial typing.
* Note :
*****************************************************************/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <rtai_trace.h>
MODULE_LICENSE("GPL");
/* Local variables */
static int rt_tracer_registered = 0; /* Is there a tracer registered */
tracer_call rt_tracer = NULL; /* The registered tracer */
/****************************************************
* Function: rt_register_tracer()
* Description:
* Register the tracer to RTAI
* Return values :
* 0, all is OK
* -1, tracer already registered
****************************************************/
int rt_register_tracer(tracer_call pmTraceFunction)
{
/* Is there a tracer already registered */
if(rt_tracer_registered == 1)
return -1;
/* Set the tracer to the one being passed by the caller */
rt_tracer = pmTraceFunction;
/* Remember that a tracer is now registered */
rt_tracer_registered = 1;
/* Tell the caller that everything went fine */
return 0;
}
/***************************************************
* Function: rt_unregister_tracer()
* Description:
* Unregister the currently registered tracer.
* Return values :
* 0, all is OK
* -ENOMEDIUM, there isn't a registered tracer
* -ENXIO, unregestering wrong tracer
***************************************************/
int rt_unregister_tracer(tracer_call pmTraceFunction)
{
/* Is there a tracer already registered */
if(rt_tracer_registered == 0)
/* Nothing to unregister */
return -ENOMEDIUM;
/* Is it the tracer that was registered */
if(rt_tracer == pmTraceFunction)
/* There isn't any tracer in here */
rt_tracer_registered = 0;
else
return -ENXIO;
/* Reset tracer function */
rt_tracer = NULL;
/* Reset the registered flag */
rt_tracer_registered = 0;
/* Tell the caller that everything went OK */
return 0;
}
/*******************************************************
* Function: rt_trace_event()
* Description:
* Trace an event
* Parameters :
* pmEventID, the event's ID (check out rtai_trace.h)
* pmEventStruct, the structure describing the event
* Return values :
* 0, all is OK
* -ENOMEDIUM, there isn't a registered tracer
* -EBUSY, tracing hasn't started yet
*******************************************************/
int rt_trace_event(uint8_t pmEventID,
void* pmEventStruct)
{
/* Is there a tracer registered */
if(rt_tracer_registered != 1)
return -ENOMEDIUM;
/* Call the tracer */
return (rt_tracer(pmEventID, pmEventStruct));
}
/*******************************************************
* Function: __rtai_trace_init()
* Description:
* Initializes the RTAI trace module
* Parameters :
* NONE
* Return values :
* 0, all is OK
*******************************************************/
int __rtai_trace_init(void)
{
return 0;
}
/*******************************************************
* Function: __rtai_trace_exit()
* Description:
* Cleans-up the RTAI trace module
* Parameters :
* NONE
* Return values :
* NONE
*******************************************************/
void __rtai_trace_exit(void)
{
}
module_init(__rtai_trace_init);
module_exit(__rtai_trace_exit);
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