temperature-sensor.c

00001 /*
00002  * Copyright (c) 2005, Swedish Institute of Computer Science.
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the Institute nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  *
00029  * $Id: temperature-sensor.c,v 1.3 2010/02/08 00:00:45 nifi Exp $
00030  *
00031  * -----------------------------------------------------------------
00032  *
00033  * Author  : Adam Dunkels, Joakim Eriksson, Niclas Finne
00034  * Created : 2005-11-01
00035  * Updated : $Date: 2010/02/08 00:00:45 $
00036  *           $Revision: 1.3 $
00037  */
00038 
00039 #include "dev/temperature-sensor.h"
00040 #include "dev/ds1629.h"
00041 
00042 const struct sensors_sensor temperature_sensor;
00043 static int active;
00044 
00045 /*---------------------------------------------------------------------------*/
00046 static int
00047 value(int type)
00048 {
00049   unsigned int temp;
00050   signed int t;
00051 
00052   t = ds1629_temperature();
00053   temp = ((t / 128) * 50);
00054   return temp;
00055 }
00056 /*---------------------------------------------------------------------------*/
00057 static int
00058 configure(int type, int value)
00059 {
00060   switch(type) {
00061   case SENSORS_HW_INIT:
00062     active = 0;
00063     ds1629_init();
00064     return 1;
00065   case SENSORS_ACTIVE:
00066     if(value) {
00067       if(!active) {
00068         active = 1;
00069         ds1629_start();
00070       }
00071     } else {
00072       active = 0;
00073     }
00074     return 1;
00075   }
00076   return 0;
00077 }
00078 /*---------------------------------------------------------------------------*/
00079 static int
00080 status(int type)
00081 {
00082   switch(type) {
00083   case SENSORS_ACTIVE:
00084   case SENSORS_READY:
00085     return active;
00086   }
00087   return 0;
00088 }
00089 /*---------------------------------------------------------------------------*/
00090 SENSORS_SENSOR(temperature_sensor, TEMPERATURE_SENSOR,
00091                value, configure, status);

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