diff options
Diffstat (limited to 'drivers/net/sk98lin/sklm80.c')
| -rw-r--r-- | drivers/net/sk98lin/sklm80.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/drivers/net/sk98lin/sklm80.c b/drivers/net/sk98lin/sklm80.c new file mode 100644 index 000000000000..a204f5bb55d4 --- /dev/null +++ b/drivers/net/sk98lin/sklm80.c @@ -0,0 +1,141 @@ +/****************************************************************************** + * + * 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); +} + |