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/******************************************************************************
*
* Name: sklm80.c
* Project: GEnesis, PCI Gigabit Ethernet Adapter
* Version: $Revision: 1.17 $
* Date: $Date: 1999/11/22 13:35:51 $
* Purpose: Funktions to access Voltage and Temperature Sensor (LM80)
*
******************************************************************************/
/******************************************************************************
*
* (C)Copyright 1998,1999 SysKonnect,
* a business unit of Schneider & Koch & Co. Datensysteme GmbH.
*
* 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.
*
* The information in this file is provided "AS IS" without warranty.
*
******************************************************************************/
/******************************************************************************
*
* History:
*
* $Log: sklm80.c,v $
* Revision 1.17 1999/11/22 13:35:51 cgoos
* Changed license header to GPL.
*
* Revision 1.16 1999/05/27 14:05:47 malthoff
* Fans: Set SenVal to 0 if the fan value is 0 or 0xff. Both values
* are outside the limits (0: div zero error, 0xff: value not in
* range, assume 0).
*
* Revision 1.15 1999/05/27 13:38:51 malthoff
* Pervent from Division by zero errors.
*
* Revision 1.14 1999/05/20 09:20:01 cgoos
* Changes for 1000Base-T (Fan sensors).
*
* Revision 1.13 1998/10/22 09:48:14 gklug
* fix: SysKonnectFileId typo
*
* Revision 1.12 1998/10/09 06:12:06 malthoff
* Remove ID_sccs by SysKonnectFileId.
*
* Revision 1.11 1998/09/04 08:33:48 malthoff
* bug fix: SenState = SK_SEN_IDLE when
* leaving SK_SEN_VALEXT state
*
* Revision 1.10 1998/08/20 12:02:10 gklug
* fix: compiler warnings type mismatch
*
* Revision 1.9 1998/08/20 11:37:38 gklug
* chg: change Ioc to IoC
*
* Revision 1.8 1998/08/19 12:20:58 gklug
* fix: remove struct from C files (see CCC)
*
* Revision 1.7 1998/08/17 07:04:57 malthoff
* Take SkLm80RcvReg() function from ski2c.c.
* Add IoC parameter to BREAK_OR_WAIT() macro.
*
* Revision 1.6 1998/08/14 07:11:28 malthoff
* remove pAc with pAC.
*
* Revision 1.5 1998/08/14 06:46:55 gklug
* fix: temperature can get negative
*
* Revision 1.4 1998/08/13 08:27:04 gklug
* add: temperature reading now o.k.
* fix: pSen declaration, SK_ERR_LOG call, ADDR macro
*
* Revision 1.3 1998/08/13 07:28:21 gklug
* fix: pSen was wrong initialized
* add: correct conversion for voltage readings
*
* Revision 1.2 1998/08/11 07:52:14 gklug
* add: Lm80 read sensor function
*
* Revision 1.1 1998/07/17 09:57:12 gklug
* initial version
*
*
*
******************************************************************************/
/*
LM80 functions
*/
static const char SysKonnectFileId[] =
"$Id: sklm80.c,v 1.17 1999/11/22 13:35:51 cgoos Exp $" ;
#include "h/skdrv1st.h" /* Driver Specific Definitions */
#include "h/lm80.h"
#include "h/skdrv2nd.h" /* Adapter Control- and Driver specific Def. */
#ifdef SK_DIAG
#define BREAK_OR_WAIT(pAC,IoC,Event) SkI2cWait(pAC,IoC,Event)
#else /* nSK_DIAG */
#define BREAK_OR_WAIT(pAC,IoC,Event) break
#endif /* nSK_DIAG */
#ifdef SK_DIAG
/*
* read the regeister 'reg' from the device 'device'
*
* return read error -1
* success the read value
*/
int SkLm80RcvReg(
SK_IOC IoC, /* Adapter Context */
int Dev, /* I2C device address */
int Reg) /* register to read */
{
int Val = 0;
int TempExt;
/* Signal device number */
if (SkI2cSndDev(IoC, Dev, I2C_WRITE)) {
return(-1);
}
if (SkI2cSndByte(IoC, Reg)) {
return(-1);
}
/* repeat start */
if (SkI2cSndDev(IoC, Dev, I2C_READ)) {
return(-1);
}
switch(Reg) {
case LM80_TEMP_IN:
Val = (int)SkI2cRcvByte(IoC, 1) ;
/* First: correct the value: it might be negative */
if ((Val & 0x80) != 0) {
/* Value is negative */
Val = Val - 256;
}
Val = Val * SK_LM80_TEMP_LSB;
SkI2cStop(IoC);
TempExt = (int) SkLm80RcvReg(IoC,LM80_ADDR,LM80_TEMP_CTRL);
if (Val > 0) {
Val += ((TempExt >> 7) * SK_LM80_TEMPEXT_LSB);
}
else {
Val -= ((TempExt >> 7) * SK_LM80_TEMPEXT_LSB);
}
return(Val);
break;
case LM80_VT0_IN:
case LM80_VT1_IN:
case LM80_VT2_IN:
case LM80_VT3_IN:
Val = (int) SkI2cRcvByte(IoC, 1) * SK_LM80_VT_LSB;
break;
default:
Val = (int) SkI2cRcvByte(IoC, 1);
break;
}
SkI2cStop(IoC);
return(Val);
}
#endif /* SK_DIAG */
/*
* read a sensors value (LM80 specific)
*
* This function reads a sensors value from the I2c sensor chip LM80. The
* sensor is defined by its index into the sensors database in the struct
* pAC points to.
*
* Returns 1 if the read is completed
* 0 if the read must be continued (I2c Bus still allocated)
*/
int SkLm80ReadSensor(
SK_AC *pAC, /* Adapter Context */
SK_IOC IoC, /* IoContext needed in level 1 and 2 */
SK_SENSOR *pSen) /* Sensor to be read */
{
SK_I32 Value;
switch(pSen->SenState) {
case SK_SEN_IDLE:
/* Send address to ADDR register */
SK_I2C_CTL(IoC,I2C_READ,pSen->SenDev,pSen->SenReg,0);
pSen->SenState = SK_SEN_VALUE ;
BREAK_OR_WAIT(pAC, IoC, I2C_READ) ;
case SK_SEN_VALUE:
/* Read value from data register */
SK_IN32(IoC,B2_I2C_DATA, ((SK_U32 *)&Value));
Value &= 0xff; /* only least significant byte is valid */
/* Do NOT check the Value against the thresholds */
/* Checking is done in the calling instance */
if (pSen->SenType == SK_SEN_VOLT) {
/* Voltage sensor */
pSen->SenValue = Value * SK_LM80_VT_LSB;
pSen->SenState = SK_SEN_IDLE ;
return(1);
}
if (pSen->SenType == SK_SEN_FAN) {
if (Value != 0 && Value != 0xff) {
/* Fan speed counter */
pSen->SenValue = SK_LM80_FAN_FAKTOR/Value;
}
else {
/* Indicate Fan error */
pSen->SenValue = 0;
}
pSen->SenState = SK_SEN_IDLE ;
return(1);
}
/* First: correct the value: it might be negative */
if ((Value & 0x80) != 0) {
/* Value is negative */
Value = Value - 256;
}
/* We have a temperature sensor and need to get the signed
* extension. For now we get the extension from the last
* reading, so in the normal case we won't see flickering
* temperatures.
*/
pSen->SenValue = (Value * SK_LM80_TEMP_LSB) +
(pSen->SenValue % SK_LM80_TEMP_LSB);
/* Send address to ADDR register */
SK_I2C_CTL(IoC, I2C_READ, pSen->SenDev, LM80_TEMP_CTRL, 0);
pSen->SenState = SK_SEN_VALEXT ;
BREAK_OR_WAIT(pAC, IoC, I2C_READ) ;
case SK_SEN_VALEXT:
/* Read value from data register */
SK_IN32(IoC,B2_I2C_DATA,((SK_U32 *)&Value));
Value &= LM80_TEMP_LSB_9; /* only bit 7 is valid */
/* cut the LSB bit */
pSen->SenValue = ((pSen->SenValue / SK_LM80_TEMP_LSB) *
SK_LM80_TEMP_LSB) ;
if (pSen->SenValue < 0) {
/* Value negative: The bit value must be subtracted */
pSen->SenValue -= ((Value >> 7) * SK_LM80_TEMPEXT_LSB);
} else {
/* Value positive: The bit value must be added */
pSen->SenValue += ((Value >> 7) * SK_LM80_TEMPEXT_LSB);
}
pSen->SenState = SK_SEN_IDLE ;
return(1);
default:
SK_ERR_LOG(pAC, SK_ERRCL_SW, SKERR_I2C_E007,
SKERR_I2C_E007MSG) ;
return(1);
}
/* Not completed */
return(0) ;
}
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