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6dd652fa WD |
1 | /* |
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 | * | |
1a459660 | 10 | * SPDX-License-Identifier: GPL-2.0+ |
6dd652fa WD |
11 | */ |
12 | ||
13 | /* | |
14 | * Analog Devices's ADM1021 | |
15 | * "Low Cost Microprocessor System Temperature Monitor" | |
16 | */ | |
17 | ||
18 | #include <common.h> | |
19 | ||
6dd652fa WD |
20 | #include <i2c.h> |
21 | #include <dtt.h> | |
22 | ||
6ecbb45b MS |
23 | #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 | ||
6dd652fa WD |
54 | typedef |
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 | } | |
66 | dtt_cfg_t; | |
67 | ||
6d0f6bcf | 68 | dtt_cfg_t dttcfg[] = CONFIG_SYS_DTT_ADM1021; |
6dd652fa WD |
69 | |
70 | int | |
71 | dtt_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 | ||
82 | int | |
83 | dtt_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 | ||
780f13a9 HS |
96 | int |
97 | dtt_init_one(int sensor) | |
6dd652fa WD |
98 | { |
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; | |
780f13a9 | 151 | } /* dtt_init_one() */ |
6dd652fa WD |
152 | |
153 | int | |
154 | dtt_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() */ |