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 * See file CREDITS for list of people who contributed to this
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License as
15 * published by the Free Software Foundation; either version 2 of
16 * the License, or (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
30 * Analog Devices's ADM1021
31 * "Low Cost Microprocessor System Temperature Monitor"
39 #define DTT_READ_LOC_VALUE 0x00
40 #define DTT_READ_REM_VALUE 0x01
41 #define DTT_READ_STATUS 0x02
42 #define DTT_READ_CONFIG 0x03
43 #define DTT_READ_CONVRATE 0x04
44 #define DTT_READ_LOC_HIGHLIM 0x05
45 #define DTT_READ_LOC_LOWLIM 0x06
46 #define DTT_READ_REM_HIGHLIM 0x07
47 #define DTT_READ_REM_LOWLIM 0x08
48 #define DTT_READ_DEVID 0xfe
50 #define DTT_WRITE_CONFIG 0x09
51 #define DTT_WRITE_CONVRATE 0x0a
52 #define DTT_WRITE_LOC_HIGHLIM 0x0b
53 #define DTT_WRITE_LOC_LOWLIM 0x0c
54 #define DTT_WRITE_REM_HIGHLIM 0x0d
55 #define DTT_WRITE_REM_LOWLIM 0x0e
56 #define DTT_WRITE_ONESHOT 0x0f
58 #define DTT_STATUS_BUSY 0x80 /* 1=ADC Converting */
59 #define DTT_STATUS_LHIGH 0x40 /* 1=Local High Temp Limit Tripped */
60 #define DTT_STATUS_LLOW 0x20 /* 1=Local Low Temp Limit Tripped */
61 #define DTT_STATUS_RHIGH 0x10 /* 1=Remote High Temp Limit Tripped */
62 #define DTT_STATUS_RLOW 0x08 /* 1=Remote Low Temp Limit Tripped */
63 #define DTT_STATUS_OPEN 0x04 /* 1=Remote Sensor Open-Circuit */
65 #define DTT_CONFIG_ALERT_MASKED 0x80 /* 0=ALERT Enabled, 1=ALERT Masked */
66 #define DTT_CONFIG_STANDBY 0x40 /* 0=Run, 1=Standby */
68 #define DTT_ADM1021_DEVID 0x41
72 uint i2c_addr:7; /* 7bit i2c chip address */
73 uint conv_rate:3; /* conversion rate */
74 uint enable_alert:1; /* enable alert output pin */
75 uint enable_local:1; /* enable internal temp sensor */
76 uint max_local:8; /* internal temp maximum */
77 uint min_local:8; /* internal temp minimum */
78 uint enable_remote:1; /* enable remote temp sensor */
79 uint max_remote:8; /* remote temp maximum */
80 uint min_remote:8; /* remote temp minimum */
84 dtt_cfg_t dttcfg[] = CONFIG_SYS_DTT_ADM1021;
87 dtt_read (int sensor, int reg)
89 dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
92 if (i2c_read(dcp->i2c_addr, reg, 1, &data, 1) != 0)
99 dtt_write (int sensor, int reg, int val)
101 dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
104 data = (uchar)(val & 0xff);
106 if (i2c_write(dcp->i2c_addr, reg, 1, &data, 1) != 0)
113 dtt_init_one(int sensor)
115 dtt_cfg_t *dcp = &dttcfg[sensor >> 1];
118 if (((sensor & 1) == 0 ? dcp->enable_local : dcp->enable_remote) == 0)
119 return 1; /* sensor is disabled (or rather ignored) */
122 * Setup High Limit register
124 if ((sensor & 1) == 0) {
125 reg = DTT_WRITE_LOC_HIGHLIM;
126 val = dcp->max_local;
129 reg = DTT_WRITE_REM_HIGHLIM;
130 val = dcp->max_remote;
132 if (dtt_write (sensor, reg, val) != 0)
136 * Setup Low Limit register
138 if ((sensor & 1) == 0) {
139 reg = DTT_WRITE_LOC_LOWLIM;
140 val = dcp->min_local;
143 reg = DTT_WRITE_REM_LOWLIM;
144 val = dcp->min_remote;
146 if (dtt_write (sensor, reg, val) != 0)
149 /* shouldn't hurt if the rest gets done twice */
152 * Setup Conversion Rate register
154 if (dtt_write (sensor, DTT_WRITE_CONVRATE, dcp->conv_rate) != 0)
158 * Setup configuraton register
160 val = 0; /* running */
161 if (dcp->enable_alert == 0)
162 val |= DTT_CONFIG_ALERT_MASKED; /* mask ALERT pin */
163 if (dtt_write (sensor, DTT_WRITE_CONFIG, val) != 0)
167 } /* dtt_init_one() */
170 dtt_get_temp (int sensor)
174 if ((sensor & 1) == 0)
175 val = dtt_read(sensor, DTT_READ_LOC_VALUE);
177 val = dtt_read(sensor, DTT_READ_REM_VALUE);
180 } /* dtt_get_temp() */