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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  *
10  * SPDX-License-Identifier:     GPL-2.0+
11  */
12
13 /*
14  * Analog Devices's ADM1021
15  * "Low Cost Microprocessor System Temperature Monitor"
16  */
17
18 #include <common.h>
19
20 #include <i2c.h>
21 #include <dtt.h>
22
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
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
68 dtt_cfg_t dttcfg[] = CONFIG_SYS_DTT_ADM1021;
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
96 int
97 dtt_init_one(int sensor)
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;
151 } /* dtt_init_one() */
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() */