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To implement rtc driver for some ec chips, we need to convert between calandar date and seconds (since epoch time, 01-01-1970 00:00:00). Sicne these functions are HW-independent, let's add common/rtc.c, include/rtc.h, and unit test for this. BUG=b:63908519 BRANCH=none TEST=make buildall test -j Change-Id: Icb1e768d2b3674d5225b83e09475e984eb104d06 Signed-off-by: Philip Chen <philipchen@google.com> Reviewed-on: https://chromium-review.googlesource.com/666985 Commit-Ready: Philip Chen <philipchen@chromium.org> Tested-by: Philip Chen <philipchen@chromium.org> Reviewed-by: Shawn N <shawnn@chromium.org> Reviewed-by: Brian Norris <briannorris@chromium.org>
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/* Copyright 2017 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* RTC cross-platform functions */
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#ifndef __CROS_EC_RTC_H
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#define __CROS_EC_RTC_H
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#include "common.h"
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#define SECS_PER_DAY (60 * 60 * 24)
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#define SECS_PER_YEAR (365 * SECS_PER_DAY)
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/* The seconds elapsed from 01-01-1970 to 01-01-2000 */
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#define SECS_TILL_YEAR_2K (946684800)
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#define IS_LEAP_YEAR(x) \
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(((x) % 4 == 0) && (((x) % 100 != 0) || ((x) % 400 == 0)))
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struct calendar_date {
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/* The number of years since A.D. 2000, i.e. year = 17 for y2017 */
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uint8_t year;
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/* 1-based indexing, i.e. sane values range from 1 to 12 */
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uint8_t month;
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/* 1-based indexing, i.e. sane values range from 1 to 31 */
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uint8_t day;
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};
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/**
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* Convert calendar date to seconds elapsed since epoch time.
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*
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* @param time The calendar date (years, months, and days).
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* @return the seconds elapsed since epoch time (01-01-1970 00:00:00).
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*/
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uint32_t date_to_sec(struct calendar_date time);
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/**
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* Convert seconds elapsed since epoch time to calendar date
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*
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* @param sec The seconds elapsed since epoch time (01-01-1970 00:00:00).
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* @return the calendar date (years, months, and days).
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*/
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struct calendar_date sec_to_date(uint32_t sec);
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#endif /* __CROS_EC_RTC_H */
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