LXR uboot/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 * This program is free software: you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License as published by
   7 * the Free Software Foundation, either version 2 of the License, or
   8 * (at your option) any later version.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16*/
  17
  18#include <common.h>
  19#include <i2c.h>
  20#include <dtt.h>
  21
  22#define ADT7460_ADDRESS         0x2c
  23#define ADT7460_INVALID         128
  24#define ADT7460_CONFIG          0x40
  25#define ADT7460_REM1_TEMP       0x25
  26#define ADT7460_LOCAL_TEMP      0x26
  27#define ADT7460_REM2_TEMP       0x27
  28
  29int dtt_read(int sensor, int reg)
  30{
  31        u8 dir = reg;
  32        u8 data;
  33
  34        if (i2c_read(ADT7460_ADDRESS, dir, 1, &data, 1) == -1)
  35                return -1;
  36        if (data == ADT7460_INVALID)
  37                return -1;
  38
  39        return data;
  40}
  41
  42int dtt_write(int sensor, int reg, int val)
  43{
  44        u8 dir = reg;
  45        u8 data = val;
  46
  47        if (i2c_write(ADT7460_ADDRESS, dir, 1, &data, 1) == -1)
  48                return -1;
  49
  50        return 0;
  51}
  52
  53int dtt_init(void)
  54{
  55        printf("ADT7460 at I2C address 0x%2x\n", ADT7460_ADDRESS);
  56
  57        if (dtt_write(0, ADT7460_CONFIG, 1) == -1) {
  58                puts("Error initialiting ADT7460\n");
  59                return -1;
  60        }
  61
  62        return 0;
  63}
  64
  65int dtt_get_temp(int sensor)
  66{
  67        int aux;
  68        u8 table[] =
  69            { ADT7460_REM1_TEMP, ADT7460_LOCAL_TEMP, ADT7460_REM2_TEMP };
  70
  71        if (sensor > 2) {
  72                puts("DTT sensor does not exist\n");
  73                return -1;
  74        }
  75
  76        aux = dtt_read(0, table[sensor]);
  77        if (aux == -1) {
  78                puts("DTT temperature read failed\n");
  79                return -1;
  80        }
  81
  82        return aux;
  83}
  84