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141 lines
4.0 KiB
141 lines
4.0 KiB
/******************************************************************************
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*
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* Name: sklm80.c
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* Project: Gigabit Ethernet Adapters, TWSI-Module
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* Version: $Revision: 1.22 $
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* Date: $Date: 2003/10/20 09:08:21 $
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* Purpose: Functions to access Voltage and Temperature Sensor (LM80)
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*
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******************************************************************************/
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/******************************************************************************
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*
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* (C)Copyright 1998-2002 SysKonnect.
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* (C)Copyright 2002-2003 Marvell.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* The information in this file is provided "AS IS" without warranty.
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*
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******************************************************************************/
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/*
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LM80 functions
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*/
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#if (defined(DEBUG) || ((!defined(LINT)) && (!defined(SK_SLIM))))
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static const char SysKonnectFileId[] =
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"@(#) $Id: sklm80.c,v 1.22 2003/10/20 09:08:21 rschmidt Exp $ (C) Marvell. ";
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#endif
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#include "h/skdrv1st.h" /* Driver Specific Definitions */
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#include "h/lm80.h"
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#include "h/skdrv2nd.h" /* Adapter Control- and Driver specific Def. */
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#define BREAK_OR_WAIT(pAC,IoC,Event) break
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/*
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* read a sensors value (LM80 specific)
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*
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* This function reads a sensors value from the I2C sensor chip LM80.
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* The sensor is defined by its index into the sensors database in the struct
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* pAC points to.
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*
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* Returns 1 if the read is completed
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* 0 if the read must be continued (I2C Bus still allocated)
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*/
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int SkLm80ReadSensor(
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SK_AC *pAC, /* Adapter Context */
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SK_IOC IoC, /* I/O Context needed in level 1 and 2 */
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SK_SENSOR *pSen) /* Sensor to be read */
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{
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SK_I32 Value;
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switch (pSen->SenState) {
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case SK_SEN_IDLE:
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/* Send address to ADDR register */
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SK_I2C_CTL(IoC, I2C_READ, pSen->SenDev, I2C_025K_DEV, pSen->SenReg, 0);
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pSen->SenState = SK_SEN_VALUE ;
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BREAK_OR_WAIT(pAC, IoC, I2C_READ);
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case SK_SEN_VALUE:
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/* Read value from data register */
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SK_IN32(IoC, B2_I2C_DATA, ((SK_U32 *)&Value));
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Value &= 0xff; /* only least significant byte is valid */
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/* Do NOT check the Value against the thresholds */
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/* Checking is done in the calling instance */
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if (pSen->SenType == SK_SEN_VOLT) {
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/* Voltage sensor */
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pSen->SenValue = Value * SK_LM80_VT_LSB;
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pSen->SenState = SK_SEN_IDLE ;
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return(1);
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}
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if (pSen->SenType == SK_SEN_FAN) {
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if (Value != 0 && Value != 0xff) {
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/* Fan speed counter */
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pSen->SenValue = SK_LM80_FAN_FAKTOR/Value;
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}
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else {
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/* Indicate Fan error */
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pSen->SenValue = 0;
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}
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pSen->SenState = SK_SEN_IDLE ;
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return(1);
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}
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/* First: correct the value: it might be negative */
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if ((Value & 0x80) != 0) {
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/* Value is negative */
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Value = Value - 256;
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}
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/* We have a temperature sensor and need to get the signed extension.
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* For now we get the extension from the last reading, so in the normal
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* case we won't see flickering temperatures.
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*/
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pSen->SenValue = (Value * SK_LM80_TEMP_LSB) +
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(pSen->SenValue % SK_LM80_TEMP_LSB);
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/* Send address to ADDR register */
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SK_I2C_CTL(IoC, I2C_READ, pSen->SenDev, I2C_025K_DEV, LM80_TEMP_CTRL, 0);
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pSen->SenState = SK_SEN_VALEXT ;
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BREAK_OR_WAIT(pAC, IoC, I2C_READ);
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case SK_SEN_VALEXT:
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/* Read value from data register */
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SK_IN32(IoC, B2_I2C_DATA, ((SK_U32 *)&Value));
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Value &= LM80_TEMP_LSB_9; /* only bit 7 is valid */
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/* cut the LSB bit */
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pSen->SenValue = ((pSen->SenValue / SK_LM80_TEMP_LSB) *
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SK_LM80_TEMP_LSB);
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if (pSen->SenValue < 0) {
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/* Value negative: The bit value must be subtracted */
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pSen->SenValue -= ((Value >> 7) * SK_LM80_TEMPEXT_LSB);
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}
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else {
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/* Value positive: The bit value must be added */
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pSen->SenValue += ((Value >> 7) * SK_LM80_TEMPEXT_LSB);
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}
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pSen->SenState = SK_SEN_IDLE ;
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return(1);
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default:
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SK_ERR_LOG(pAC, SK_ERRCL_SW, SKERR_I2C_E007, SKERR_I2C_E007MSG);
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return(1);
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}
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/* Not completed */
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return(0);
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}
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