firmware/drivers/rtc/rtc_pcf50606.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Linus Nielsen Feltzing, Uwe Freese, Laurent Baum
  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 #include "config.h"
  22 #include "i2c.h"
  23 #include "rtc.h"
  24 #include "kernel.h"
  25 #include "system.h"
  26 #include "pcf50606.h"
  27
  28 void rtc_init(void)
  29 {
  30 }
  31
  32 int rtc_read_datetime(struct tm *tm)
  33 {
  34     unsigned int i;
  35     int rc, oldlevel;
  36     unsigned char buf[7];
  37
  38     oldlevel = disable_irq_save();
  39
  40     rc = pcf50606_read_multiple(0x0a, buf, sizeof(buf));
  41
  42     restore_irq(oldlevel);
  43
  44     for (i = 0; i < sizeof(buf); i++)
  45         buf[i] = BCD2DEC(buf[i]);
  46
  47     tm->tm_sec = buf[0];
  48     tm->tm_min = buf[1];
  49     tm->tm_hour = buf[2];
  50     tm->tm_wday = buf[3];
  51     tm->tm_mday = buf[4];
  52     tm->tm_mon = buf[5] - 1;
  53 #ifdef IRIVER_H300_SERIES
  54     /* Special kludge to coexist with the iriver firmware. The iriver firmware
  55        stores the date as 1965+nn, and allows a range of 1980..2064. We use
  56        1964+nn here to make leap years work correctly, so the date will be one
  57        year off in the iriver firmware but at least won't be reset anymore. */
  58     tm->tm_year = buf[6] + 64;
  59 #else /* Not IRIVER_H300_SERIES */
  60     tm->tm_year = buf[6] + 100;
  61 #endif /* IRIVER_H300_SERIES */
  62
  63     return rc;
  64 }
  65
  66 int rtc_write_datetime(const struct tm *tm)
  67 {
  68     unsigned int i;
  69     int rc, oldlevel;
  70     unsigned char buf[7];
  71
  72     buf[0] = tm->tm_sec;
  73     buf[1] = tm->tm_min;
  74     buf[2] = tm->tm_hour;
  75     buf[3] = tm->tm_wday;
  76     buf[4] = tm->tm_mday;
  77     buf[5] = tm->tm_mon + 1;
  78 #ifdef IRIVER_H300_SERIES
  79     /* Iriver firmware compatibility kludge, see rtc_read_datetime(). */
  80     buf[6] = tm->tm_year - 64;
  81 #else /* Not IRIVER_H300_SERIES */
  82     buf[6] = tm->tm_year - 100;
  83 #endif /* IRIVER_H300_SERIES */
  84
  85     for (i = 0; i < sizeof(buf); i++)
  86          buf[i] = DEC2BCD(buf[i]);
  87
  88     oldlevel = disable_irq_save();
  89
  90     rc = pcf50606_write_multiple(0x0a, buf, sizeof(buf));
  91
  92     restore_irq(oldlevel);
  93
  94     return rc;
  95 }
  96