firmware/common/timefuncs.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Linus Nielsen Feltzing
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include <stdio.h> /* get NULL */
  23 #include "config.h"
  24
  25 #include "kernel.h"
  26 #include "rtc.h"
  27 #include "timefuncs.h"
  28 #include "debug.h"
  29
  30 static struct tm tm;
  31
  32 #if !CONFIG_RTC
  33 static void fill_default_tm(struct tm *tm)
  34 {
  35     tm->tm_sec = 0;
  36     tm->tm_min = 0;
  37     tm->tm_hour = 0;
  38     tm->tm_mday = 1;
  39     tm->tm_mon = 0;
  40     tm->tm_year = 70;
  41     tm->tm_wday = 1;
  42     tm->tm_yday = 0; /* Not implemented for now */
  43     tm->tm_isdst = -1; /* Not implemented for now */
  44 }
  45 #endif /* !CONFIG_RTC */
  46
  47 #if CONFIG_RTC
  48 bool valid_time(const struct tm *tm)
  49 {
  50     if (tm->tm_hour < 0 || tm->tm_hour > 23 ||
  51         tm->tm_sec < 0 || tm->tm_sec > 59 ||
  52         tm->tm_min < 0 || tm->tm_min > 59 ||
  53         tm->tm_year < 100 || tm->tm_year > 199 ||
  54         tm->tm_mon < 0 || tm->tm_mon > 11 ||
  55         tm->tm_wday < 0 || tm->tm_wday > 6 ||
  56         tm->tm_mday < 1 || tm->tm_mday > 31)
  57         return false;
  58     else
  59         return true;
  60 }
  61 #endif /* CONFIG_RTC */
  62
  63 struct tm *get_time(void)
  64 {
  65 #if CONFIG_RTC
  66     static long timeout = 0;
  67
  68     /* Don't read the RTC more than once per second */
  69     if (TIME_AFTER(current_tick, timeout))
  70     {
  71         /* Once per second, 1/10th of a second off */
  72         timeout = HZ * (current_tick / HZ + 1) + HZ / 5;
  73         rtc_read_datetime(&tm);
  74         set_day_of_week(&tm);
  75
  76         tm.tm_yday = 0; /* Not implemented for now */
  77         tm.tm_isdst = -1; /* Not implemented for now */
  78     }
  79 #else /* No RTC */
  80     fill_default_tm(&tm);
  81 #endif /* RTC */
  82     return &tm;
  83 }
  84
  85 int set_time(const struct tm *tm)
  86 {
  87 #if CONFIG_RTC
  88     int rc;
  89
  90     if (valid_time(tm))
  91     {
  92         rc = rtc_write_datetime(tm);
  93
  94         if (rc < 0)
  95             return -1;
  96         else
  97             return 0;
  98     }
  99     else
 100     {
 101         return -2;
 102     }
 103 #else /* No RTC */
 104     (void)tm;
 105     return -1;
 106 #endif /* RTC */
 107 }
 108
 109 #if CONFIG_RTC
 110 void set_day_of_week(struct tm *tm)
 111 {
 112     int y=tm->tm_year+1900;
 113     int d=tm->tm_mday;
 114     int m=tm->tm_mon;
 115     static const char mo[] = { 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4 };
 116
 117     if(m == 0 || m == 1) y--;
 118     tm->tm_wday = (d + mo[m] + y + y/4 - y/100 + y/400) % 7;
 119 }
 120 #endif /* CONFIG_RTC */
 121