1/******************************************************************************
2 *
3 * Name:	sklm80.c
4 * Project:	Gigabit Ethernet Adapters, TWSI-Module
5 * Version:	$Revision: 1.1.1.1 $
6 * Date:	$Date: 2007/08/03 18:52:48 $
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)))
29static const char SysKonnectFileId[] =
30	"@(#) $Id: sklm80.c,v 1.1.1.1 2007/08/03 18:52:48 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 */
49int SkLm80ReadSensor(
50SK_AC		*pAC,	/* Adapter Context */
51SK_IOC		IoC,	/* I/O Context needed in level 1 and 2 */
52SK_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