| Stephen Hemminger | 5ad887f | 2007-09-15 19:35:14 -0400 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Name: sklm80.c |
| 4 | * Project: Gigabit Ethernet Adapters, TWSI-Module |
| 5 | * Version: $Revision: 1.22 $ |
| 6 | * Date: $Date: 2003/10/20 09:08:21 $ |
| 7 | * Purpose: Functions to access Voltage and Temperature Sensor (LM80) |
| 8 | * |
| 9 | ******************************************************************************/ |
| 10 | |
| 11 | /****************************************************************************** |
| 12 | * |
| 13 | * (C)Copyright 1998-2002 SysKonnect. |
| 14 | * (C)Copyright 2002-2003 Marvell. |
| 15 | * |
| 16 | * This program is free software; you can redistribute it and/or modify |
| 17 | * it under the terms of the GNU General Public License as published by |
| 18 | * the Free Software Foundation; either version 2 of the License, or |
| 19 | * (at your option) any later version. |
| 20 | * |
| 21 | * The information in this file is provided "AS IS" without warranty. |
| 22 | * |
| 23 | ******************************************************************************/ |
| 24 | |
| 25 | /* |
| 26 | LM80 functions |
| 27 | */ |
| 28 | #if (defined(DEBUG) || ((!defined(LINT)) && (!defined(SK_SLIM)))) |
| 29 | static const char SysKonnectFileId[] = |
| 30 | "@(#) $Id: sklm80.c,v 1.22 2003/10/20 09:08:21 rschmidt Exp $ (C) Marvell. "; |
| 31 | #endif |
| 32 | |
| 33 | #include "h/skdrv1st.h" /* Driver Specific Definitions */ |
| 34 | #include "h/lm80.h" |
| 35 | #include "h/skdrv2nd.h" /* Adapter Control- and Driver specific Def. */ |
| 36 | |
| 37 | #define BREAK_OR_WAIT(pAC,IoC,Event) break |
| 38 | |
| 39 | /* |
| 40 | * read a sensors value (LM80 specific) |
| 41 | * |
| 42 | * This function reads a sensors value from the I2C sensor chip LM80. |
| 43 | * The sensor is defined by its index into the sensors database in the struct |
| 44 | * pAC points to. |
| 45 | * |
| 46 | * Returns 1 if the read is completed |
| 47 | * 0 if the read must be continued (I2C Bus still allocated) |
| 48 | */ |
| 49 | int SkLm80ReadSensor( |
| 50 | SK_AC *pAC, /* Adapter Context */ |
| 51 | SK_IOC IoC, /* I/O Context needed in level 1 and 2 */ |
| 52 | SK_SENSOR *pSen) /* Sensor to be read */ |
| 53 | { |
| 54 | SK_I32 Value; |
| 55 | |
| 56 | switch (pSen->SenState) { |
| 57 | case SK_SEN_IDLE: |
| 58 | /* Send address to ADDR register */ |
| 59 | SK_I2C_CTL(IoC, I2C_READ, pSen->SenDev, I2C_025K_DEV, pSen->SenReg, 0); |
| 60 | |
| 61 | pSen->SenState = SK_SEN_VALUE ; |
| 62 | BREAK_OR_WAIT(pAC, IoC, I2C_READ); |
| 63 | |
| 64 | case SK_SEN_VALUE: |
| 65 | /* Read value from data register */ |
| 66 | SK_IN32(IoC, B2_I2C_DATA, ((SK_U32 *)&Value)); |
| 67 | |
| 68 | Value &= 0xff; /* only least significant byte is valid */ |
| 69 | |
| 70 | /* Do NOT check the Value against the thresholds */ |
| 71 | /* Checking is done in the calling instance */ |
| 72 | |
| 73 | if (pSen->SenType == SK_SEN_VOLT) { |
| 74 | /* Voltage sensor */ |
| 75 | pSen->SenValue = Value * SK_LM80_VT_LSB; |
| 76 | pSen->SenState = SK_SEN_IDLE ; |
| 77 | return(1); |
| 78 | } |
| 79 | |
| 80 | if (pSen->SenType == SK_SEN_FAN) { |
| 81 | if (Value != 0 && Value != 0xff) { |
| 82 | /* Fan speed counter */ |
| 83 | pSen->SenValue = SK_LM80_FAN_FAKTOR/Value; |
| 84 | } |
| 85 | else { |
| 86 | /* Indicate Fan error */ |
| 87 | pSen->SenValue = 0; |
| 88 | } |
| 89 | pSen->SenState = SK_SEN_IDLE ; |
| 90 | return(1); |
| 91 | } |
| 92 | |
| 93 | /* First: correct the value: it might be negative */ |
| 94 | if ((Value & 0x80) != 0) { |
| 95 | /* Value is negative */ |
| 96 | Value = Value - 256; |
| 97 | } |
| 98 | |
| 99 | /* We have a temperature sensor and need to get the signed extension. |
| 100 | * For now we get the extension from the last reading, so in the normal |
| 101 | * case we won't see flickering temperatures. |
| 102 | */ |
| 103 | pSen->SenValue = (Value * SK_LM80_TEMP_LSB) + |
| 104 | (pSen->SenValue % SK_LM80_TEMP_LSB); |
| 105 | |
| 106 | /* Send address to ADDR register */ |
| 107 | SK_I2C_CTL(IoC, I2C_READ, pSen->SenDev, I2C_025K_DEV, LM80_TEMP_CTRL, 0); |
| 108 | |
| 109 | pSen->SenState = SK_SEN_VALEXT ; |
| 110 | BREAK_OR_WAIT(pAC, IoC, I2C_READ); |
| 111 | |
| 112 | case SK_SEN_VALEXT: |
| 113 | /* Read value from data register */ |
| 114 | SK_IN32(IoC, B2_I2C_DATA, ((SK_U32 *)&Value)); |
| 115 | Value &= LM80_TEMP_LSB_9; /* only bit 7 is valid */ |
| 116 | |
| 117 | /* cut the LSB bit */ |
| 118 | pSen->SenValue = ((pSen->SenValue / SK_LM80_TEMP_LSB) * |
| 119 | SK_LM80_TEMP_LSB); |
| 120 | |
| 121 | if (pSen->SenValue < 0) { |
| 122 | /* Value negative: The bit value must be subtracted */ |
| 123 | pSen->SenValue -= ((Value >> 7) * SK_LM80_TEMPEXT_LSB); |
| 124 | } |
| 125 | else { |
| 126 | /* Value positive: The bit value must be added */ |
| 127 | pSen->SenValue += ((Value >> 7) * SK_LM80_TEMPEXT_LSB); |
| 128 | } |
| 129 | |
| 130 | pSen->SenState = SK_SEN_IDLE ; |
| 131 | return(1); |
| 132 | |
| 133 | default: |
| 134 | SK_ERR_LOG(pAC, SK_ERRCL_SW, SKERR_I2C_E007, SKERR_I2C_E007MSG); |
| 135 | return(1); |
| 136 | } |
| 137 | |
| 138 | /* Not completed */ |
| 139 | return(0); |
| 140 | } |
| 141 | |