111 lines
3 KiB
C
111 lines
3 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2009 by Bertrik Sikken
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* Copyright (C) 2008 by Robert Kukla
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "rtc.h"
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#include "i2c-s5l8700.h"
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#include "timefuncs.h"
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/* Driver for the Seiko S35390A real-time clock chip with i2c interface
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This driver was derived from rtc_mr100.c and adapted for the S35390A
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used in the Meizu M3 (and possibly others).
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*/
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#define RTC_ADDR 0x60
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#define STATUS_REG1 0
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#define STATUS_REG2 1
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#define REALTIME_DATA1 2
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#define REALTIME_DATA2 3
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#define INT1_REG 4
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#define INT2_REG 5
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#define CLOCK_CORR_REG 6
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#define FREE_REG 7
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static void reverse_bits(unsigned char* v, int size)
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{
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static const unsigned char flipnibble[] =
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{0x00, 0x08, 0x04, 0x0C, 0x02, 0x0A, 0x06, 0x0E,
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0x01, 0x09, 0x05, 0x0D, 0x03, 0x0B, 0x07, 0x0F};
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int i;
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for (i = 0; i < size; i++) {
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v[i] = (flipnibble[v[i] & 0x0F] << 4) |
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flipnibble[(v[i] >> 4) & 0x0F];
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}
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}
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void rtc_init(void)
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{
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}
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int rtc_read_datetime(struct tm *tm)
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{
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unsigned char buf[7];
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unsigned int i;
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int ret;
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ret = i2c_read(RTC_ADDR | (REALTIME_DATA1 << 1), -1, sizeof(buf), buf);
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reverse_bits(buf, sizeof(buf));
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buf[4] &= 0x3f; /* mask out p.m. flag */
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for (i = 0; i < sizeof(buf); i++)
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buf[i] = BCD2DEC(buf[i]);
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tm->tm_sec = buf[6];
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tm->tm_min = buf[5];
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tm->tm_hour = buf[4];
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tm->tm_mday = buf[2];
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tm->tm_mon = buf[1] - 1;
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tm->tm_year = buf[0] + 100;
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set_day_of_week(tm);
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set_day_of_year(tm);
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return ret;
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}
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int rtc_write_datetime(const struct tm *tm)
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{
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unsigned char buf[7];
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unsigned int i;
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int ret;
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buf[6] = tm->tm_sec;
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buf[5] = tm->tm_min;
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buf[4] = tm->tm_hour;
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buf[3] = tm->tm_wday;
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buf[2] = tm->tm_mday;
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buf[1] = tm->tm_mon + 1;
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buf[0] = tm->tm_year - 100;
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for (i = 0; i < sizeof(buf); i++)
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buf[i] = DEC2BCD(buf[i]);
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reverse_bits(buf, sizeof(buf));
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ret = i2c_write(RTC_ADDR | (REALTIME_DATA1 << 1), -1, sizeof(buf), buf);
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return ret;
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}
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