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