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/* Copyright 2017 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* RTC cross-platform code for Chrome EC */
/* TODO(chromium:733844): Move this conversion to kernel rtc-cros-ec driver */
#include "rtc.h"
static uint16_t days_since_year_start[12] = {
0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
/* Conversion between calendar date and seconds eclapsed since 1970-01-01 */
uint32_t date_to_sec(struct calendar_date time)
{
int i;
uint32_t sec;
sec = time.year * SECS_PER_YEAR;
for (i = 0; i < time.year; i++) {
if (IS_LEAP_YEAR(i))
sec += SECS_PER_DAY;
}
sec += (days_since_year_start[time.month - 1] +
(IS_LEAP_YEAR(time.year) && time.month > 2) +
(time.day - 1)) * SECS_PER_DAY;
/* add the accumulated time in seconds from 1970 to 2000 */
return sec + SECS_TILL_YEAR_2K;
}
struct calendar_date sec_to_date(uint32_t sec)
{
struct calendar_date time;
int day_tmp; /* for intermediate calculation */
int i;
/* RTC time must be after year 2000. */
sec = (sec > SECS_TILL_YEAR_2K) ? (sec - SECS_TILL_YEAR_2K) : 0;
day_tmp = sec / SECS_PER_DAY;
time.year = day_tmp / 365;
day_tmp %= 365;
for (i = 0; i < time.year; i++) {
if (IS_LEAP_YEAR(i))
day_tmp -= 1;
}
day_tmp++;
if (day_tmp <= 0) {
time.year -= 1;
day_tmp += IS_LEAP_YEAR(time.year) ? 366 : 365;
}
for (i = 1; i < 12; i++) {
if (days_since_year_start[i] +
(IS_LEAP_YEAR(time.year) && (i >= 2)) >= day_tmp)
break;
}
time.month = i;
day_tmp -= days_since_year_start[time.month - 1] +
(IS_LEAP_YEAR(time.year) && (time.month > 2));
time.day = day_tmp;
return time;
}
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