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git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/hwmon/adm1021.c
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
[] = CFG_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 (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)
173 unsigned char sensors
[] = CONFIG_DTT_SENSORS
;
174 const char *const header
= "DTT: ";
176 /* switch to correct I2C bus */
177 I2C_SET_BUS(CFG_DTT_BUS_NUM
);
179 for (i
= 0; i
< sizeof(sensors
); i
++) {
180 if (_dtt_init(sensors
[i
]) != 0)
181 printf ("%s%d FAILED INIT\n", header
, i
+1);
183 printf ("%s%d is %i C\n", header
, i
+1,
184 dtt_get_temp(sensors
[i
]));
191 dtt_get_temp (int sensor
)
195 if ((sensor
& 1) == 0)
196 val
= dtt_read(sensor
, DTT_READ_LOC_VALUE
);
198 val
= dtt_read(sensor
, DTT_READ_REM_VALUE
);
201 } /* dtt_get_temp() */