1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/*
* (C) Copyright 2003
* Murray Jensen, CSIRO-MIT, Murray.Jensen@csiro.au
*
* based on dtt/lm75.c which is ...
*
* (C) Copyright 2001
* Bill Hunter, Wave 7 Optics, williamhunter@mediaone.net
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/*
* Analog Devices's ADM1021
* "Low Cost Microprocessor System Temperature Monitor"
*/
#include <common.h>
#ifdef CONFIG_DTT_ADM1021
#include <i2c.h>
#include <dtt.h>
typedef
struct {
uint i2c_addr:7; /* 7bit i2c chip address */
uint conv_rate:3; /* conversion rate */
uint enable_alert:1; /* enable alert output pin */
uint enable_local:1; /* enable internal temp sensor */
uint max_local:8; /* internal temp maximum */
uint min_local:8; /* internal temp minimum */
uint enable_remote:1; /* enable remote temp sensor */
uint max_remote:8; /* remote temp maximum */
uint min_remote:8; /* remote temp minimum */
}
dtt_cfg_t;
dtt_cfg_t dttcfg[] = CFG_DTT_ADM1021;
int
dtt_read (int sensor, int reg)
{
dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
uchar data;
if (i2c_read(dcp->i2c_addr, reg, 1, &data, 1) != 0)
return -1;
return (int)data;
} /* dtt_read() */
int
dtt_write (int sensor, int reg, int val)
{
dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
uchar data;
data = (uchar)(val & 0xff);
if (i2c_write(dcp->i2c_addr, reg, 1, &data, 1) != 0)
return 1;
return 0;
} /* dtt_write() */
static int
_dtt_init (int sensor)
{
dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
int reg, val;
if (((sensor & 1) == 0 ? dcp->enable_local : dcp->enable_remote) == 0)
return 1; /* sensor is disabled (or rather ignored) */
/*
* Setup High Limit register
*/
if ((sensor & 1) == 0) {
reg = DTT_WRITE_LOC_HIGHLIM;
val = dcp->max_local;
}
else {
reg = DTT_WRITE_REM_HIGHLIM;
val = dcp->max_remote;
}
if (dtt_write (sensor, reg, val) != 0)
return 1;
/*
* Setup Low Limit register
*/
if ((sensor & 1) == 0) {
reg = DTT_WRITE_LOC_LOWLIM;
val = dcp->min_local;
}
else {
reg = DTT_WRITE_REM_LOWLIM;
val = dcp->min_remote;
}
if (dtt_write (sensor, reg, val) != 0)
return 1;
/* shouldn't hurt if the rest gets done twice */
/*
* Setup Conversion Rate register
*/
if (dtt_write (sensor, DTT_WRITE_CONVRATE, dcp->conv_rate) != 0)
return 1;
/*
* Setup configuraton register
*/
val = 0; /* running */
if (dcp->enable_alert == 0)
val |= DTT_CONFIG_ALERT_MASKED; /* mask ALERT pin */
if (dtt_write (sensor, DTT_WRITE_CONFIG, val) != 0)
return 1;
return 0;
} /* _dtt_init() */
int
dtt_init (void)
{
int i;
unsigned char sensors[] = CONFIG_DTT_SENSORS;
const char *const header = "DTT: ";
/* switch to correct I2C bus */
I2C_SET_BUS(CFG_DTT_BUS_NUM);
for (i = 0; i < sizeof(sensors); i++) {
if (_dtt_init(sensors[i]) != 0)
printf ("%s%d FAILED INIT\n", header, i+1);
else
printf ("%s%d is %i C\n", header, i+1,
dtt_get_temp(sensors[i]));
}
return (0);
} /* dtt_init() */
int
dtt_get_temp (int sensor)
{
signed char val;
if ((sensor & 1) == 0)
val = dtt_read(sensor, DTT_READ_LOC_VALUE);
else
val = dtt_read(sensor, DTT_READ_REM_VALUE);
return (int) val;
} /* dtt_get_temp() */
#endif /* CONFIG_DTT_ADM1021 */
|
