drivers/hwmon/adm1021.c

   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() */