drivers/hwmon/adt7460.c

   1 /*
   2  * (C) Copyright 2008
   3  * Ricado Ribalda-Universidad Autonoma de Madrid, ricardo.ribalda@uam.es
   4  * This work has been supported by: QTechnology  http://qtec.com/
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <i2c.h>
  10 #include <dtt.h>
  11
  12 #define ADT7460_ADDRESS         0x2c
  13 #define ADT7460_INVALID         128
  14 #define ADT7460_CONFIG          0x40
  15 #define ADT7460_REM1_TEMP       0x25
  16 #define ADT7460_LOCAL_TEMP      0x26
  17 #define ADT7460_REM2_TEMP       0x27
  18
  19 int dtt_read(int sensor, int reg)
  20 {
  21         u8 dir = reg;
  22         u8 data;
  23
  24         if (i2c_read(ADT7460_ADDRESS, dir, 1, &data, 1) == -1)
  25                 return -1;
  26         if (data == ADT7460_INVALID)
  27                 return -1;
  28
  29         return data;
  30 }
  31
  32 int dtt_write(int sensor, int reg, int val)
  33 {
  34         u8 dir = reg;
  35         u8 data = val;
  36
  37         if (i2c_write(ADT7460_ADDRESS, dir, 1, &data, 1) == -1)
  38                 return -1;
  39
  40         return 0;
  41 }
  42
  43 int dtt_init_one(int sensor)
  44 {
  45         printf("ADT7460 at I2C address 0x%2x\n", ADT7460_ADDRESS);
  46
  47         if (dtt_write(0, ADT7460_CONFIG, 1) == -1) {
  48                 puts("Error initialiting ADT7460\n");
  49                 return -1;
  50         }
  51
  52         return 0;
  53 }
  54
  55 int dtt_get_temp(int sensor)
  56 {
  57         int aux;
  58         u8 table[] =
  59             { ADT7460_REM1_TEMP, ADT7460_LOCAL_TEMP, ADT7460_REM2_TEMP };
  60
  61         if (sensor > 2) {
  62                 puts("DTT sensor does not exist\n");
  63                 return -1;
  64         }
  65
  66         aux = dtt_read(0, table[sensor]);
  67         if (aux == -1) {
  68                 puts("DTT temperature read failed\n");
  69                 return -1;
  70         }
  71
  72         return aux;
  73 }