3 * Murray Jensen, CSIRO-MIT, Murray.Jensen@csiro.au
5 * based on dtt/lm75.c which is ...
8 * Bill Hunter, Wave 7 Optics, williamhunter@mediaone.net
10 * SPDX-License-Identifier: GPL-2.0+
14 * Analog Devices's ADM1021
15 * "Low Cost Microprocessor System Temperature Monitor"
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
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
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 */
49 #define DTT_CONFIG_ALERT_MASKED 0x80 /* 0=ALERT Enabled, 1=ALERT Masked */
50 #define DTT_CONFIG_STANDBY 0x40 /* 0=Run, 1=Standby */
52 #define DTT_ADM1021_DEVID 0x41
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 */
68 dtt_cfg_t dttcfg[] = CONFIG_SYS_DTT_ADM1021;
71 dtt_read (int sensor, int reg)
73 dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
76 if (i2c_read(dcp->i2c_addr, reg, 1, &data, 1) != 0)
83 dtt_write (int sensor, int reg, int val)
85 dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
88 data = (uchar)(val & 0xff);
90 if (i2c_write(dcp->i2c_addr, reg, 1, &data, 1) != 0)
97 dtt_init_one(int sensor)
99 dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
102 if (((sensor & 1) == 0 ? dcp->enable_local : dcp->enable_remote) == 0)
103 return 1; /* sensor is disabled (or rather ignored) */
106 * Setup High Limit register
108 if ((sensor & 1) == 0) {
109 reg = DTT_WRITE_LOC_HIGHLIM;
110 val = dcp->max_local;
113 reg = DTT_WRITE_REM_HIGHLIM;
114 val = dcp->max_remote;
116 if (dtt_write (sensor, reg, val) != 0)
120 * Setup Low Limit register
122 if ((sensor & 1) == 0) {
123 reg = DTT_WRITE_LOC_LOWLIM;
124 val = dcp->min_local;
127 reg = DTT_WRITE_REM_LOWLIM;
128 val = dcp->min_remote;
130 if (dtt_write (sensor, reg, val) != 0)
133 /* shouldn't hurt if the rest gets done twice */
136 * Setup Conversion Rate register
138 if (dtt_write (sensor, DTT_WRITE_CONVRATE, dcp->conv_rate) != 0)
142 * Setup configuraton register
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)
151 } /* dtt_init_one() */
154 dtt_get_temp (int sensor)
158 if ((sensor & 1) == 0)
159 val = dtt_read(sensor, DTT_READ_LOC_VALUE);
161 val = dtt_read(sensor, DTT_READ_REM_VALUE);
164 } /* dtt_get_temp() */