/******************************************************************************
*
* Name: sklm80.c
* Project: Gigabit Ethernet Adapters, TWSI-Module
* Version: $Revision: 1.22 $
* Date: $Date: 2003/10/20 09:08:21 $
* Purpose: Functions to access Voltage and Temperature Sensor (LM80)
*
******************************************************************************/
/******************************************************************************
*
* (C)Copyright 1998-2002 SysKonnect.
* (C)Copyright 2002-2003 Marvell.
*
* 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.
*
******************************************************************************/
/*
LM80 functions
*/
#if (defined(DEBUG) || ((!defined(LINT)) && (!defined(SK_SLIM))))
static const char SysKonnectFileId[] =
"@(#) $Id: sklm80.c,v 1.22 2003/10/20 09:08:21 rschmidt Exp $ (C) Marvell. ";
#endif
#include "h/skdrv1st.h" /* Driver Specific Definitions */
#include "h/lm80.h"
#include "h/skdrv2nd.h" /* Adapter Control- and Driver specific Def. */
#define BREAK_OR_WAIT(pAC,IoC,Event) break
/*
* 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, /* I/O Context 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, I2C_025K_DEV, 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, I2C_025K_DEV, 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);
}
