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wdenk6dd652f2003-06-19 23:40:20 +00001/*
2 * (C) Copyright 2003
3 * Murray Jensen, CSIRO-MIT, Murray.Jensen@csiro.au
4 *
5 * based on dtt/lm75.c which is ...
6 *
7 * (C) Copyright 2001
8 * Bill Hunter, Wave 7 Optics, williamhunter@mediaone.net
9 *
Wolfgang Denk1a459662013-07-08 09:37:19 +020010 * SPDX-License-Identifier: GPL-2.0+
wdenk6dd652f2003-06-19 23:40:20 +000011 */
12
13/*
14 * Analog Devices's ADM1021
15 * "Low Cost Microprocessor System Temperature Monitor"
16 */
17
18#include <common.h>
19
wdenk6dd652f2003-06-19 23:40:20 +000020#include <i2c.h>
21#include <dtt.h>
22
Michal Simek6ecbb452008-07-11 11:50:53 +020023#define DTT_READ_LOC_VALUE 0x00
24#define DTT_READ_REM_VALUE 0x01
25#define DTT_READ_STATUS 0x02
26#define DTT_READ_CONFIG 0x03
27#define DTT_READ_CONVRATE 0x04
28#define DTT_READ_LOC_HIGHLIM 0x05
29#define DTT_READ_LOC_LOWLIM 0x06
30#define DTT_READ_REM_HIGHLIM 0x07
31#define DTT_READ_REM_LOWLIM 0x08
32#define DTT_READ_DEVID 0xfe
33
34#define DTT_WRITE_CONFIG 0x09
35#define DTT_WRITE_CONVRATE 0x0a
36#define DTT_WRITE_LOC_HIGHLIM 0x0b
37#define DTT_WRITE_LOC_LOWLIM 0x0c
38#define DTT_WRITE_REM_HIGHLIM 0x0d
39#define DTT_WRITE_REM_LOWLIM 0x0e
40#define DTT_WRITE_ONESHOT 0x0f
41
42#define DTT_STATUS_BUSY 0x80 /* 1=ADC Converting */
43#define DTT_STATUS_LHIGH 0x40 /* 1=Local High Temp Limit Tripped */
44#define DTT_STATUS_LLOW 0x20 /* 1=Local Low Temp Limit Tripped */
45#define DTT_STATUS_RHIGH 0x10 /* 1=Remote High Temp Limit Tripped */
46#define DTT_STATUS_RLOW 0x08 /* 1=Remote Low Temp Limit Tripped */
47#define DTT_STATUS_OPEN 0x04 /* 1=Remote Sensor Open-Circuit */
48
49#define DTT_CONFIG_ALERT_MASKED 0x80 /* 0=ALERT Enabled, 1=ALERT Masked */
50#define DTT_CONFIG_STANDBY 0x40 /* 0=Run, 1=Standby */
51
52#define DTT_ADM1021_DEVID 0x41
53
wdenk6dd652f2003-06-19 23:40:20 +000054typedef
55 struct {
56 uint i2c_addr:7; /* 7bit i2c chip address */
57 uint conv_rate:3; /* conversion rate */
58 uint enable_alert:1; /* enable alert output pin */
59 uint enable_local:1; /* enable internal temp sensor */
60 uint max_local:8; /* internal temp maximum */
61 uint min_local:8; /* internal temp minimum */
62 uint enable_remote:1; /* enable remote temp sensor */
63 uint max_remote:8; /* remote temp maximum */
64 uint min_remote:8; /* remote temp minimum */
65 }
66dtt_cfg_t;
67
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020068dtt_cfg_t dttcfg[] = CONFIG_SYS_DTT_ADM1021;
wdenk6dd652f2003-06-19 23:40:20 +000069
70int
71dtt_read (int sensor, int reg)
72{
73 dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
74 uchar data;
75
76 if (i2c_read(dcp->i2c_addr, reg, 1, &data, 1) != 0)
77 return -1;
78
79 return (int)data;
80} /* dtt_read() */
81
82int
83dtt_write (int sensor, int reg, int val)
84{
85 dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
86 uchar data;
87
88 data = (uchar)(val & 0xff);
89
90 if (i2c_write(dcp->i2c_addr, reg, 1, &data, 1) != 0)
91 return 1;
92
93 return 0;
94} /* dtt_write() */
95
Heiko Schocher780f13a2011-08-01 04:01:43 +000096int
97dtt_init_one(int sensor)
wdenk6dd652f2003-06-19 23:40:20 +000098{
99 dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
100 int reg, val;
101
102 if (((sensor & 1) == 0 ? dcp->enable_local : dcp->enable_remote) == 0)
103 return 1; /* sensor is disabled (or rather ignored) */
104
105 /*
106 * Setup High Limit register
107 */
108 if ((sensor & 1) == 0) {
109 reg = DTT_WRITE_LOC_HIGHLIM;
110 val = dcp->max_local;
111 }
112 else {
113 reg = DTT_WRITE_REM_HIGHLIM;
114 val = dcp->max_remote;
115 }
116 if (dtt_write (sensor, reg, val) != 0)
117 return 1;
118
119 /*
120 * Setup Low Limit register
121 */
122 if ((sensor & 1) == 0) {
123 reg = DTT_WRITE_LOC_LOWLIM;
124 val = dcp->min_local;
125 }
126 else {
127 reg = DTT_WRITE_REM_LOWLIM;
128 val = dcp->min_remote;
129 }
130 if (dtt_write (sensor, reg, val) != 0)
131 return 1;
132
133 /* shouldn't hurt if the rest gets done twice */
134
135 /*
136 * Setup Conversion Rate register
137 */
138 if (dtt_write (sensor, DTT_WRITE_CONVRATE, dcp->conv_rate) != 0)
139 return 1;
140
141 /*
142 * Setup configuraton register
143 */
144 val = 0; /* running */
145 if (dcp->enable_alert == 0)
146 val |= DTT_CONFIG_ALERT_MASKED; /* mask ALERT pin */
147 if (dtt_write (sensor, DTT_WRITE_CONFIG, val) != 0)
148 return 1;
149
150 return 0;
Heiko Schocher780f13a2011-08-01 04:01:43 +0000151} /* dtt_init_one() */
wdenk6dd652f2003-06-19 23:40:20 +0000152
153int
154dtt_get_temp (int sensor)
155{
156 signed char val;
157
158 if ((sensor & 1) == 0)
159 val = dtt_read(sensor, DTT_READ_LOC_VALUE);
160 else
161 val = dtt_read(sensor, DTT_READ_REM_VALUE);
162
163 return (int) val;
164} /* dtt_get_temp() */