From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-lb0-x229.google.com ([2a00:1450:4010:c04::229]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XCDjm-0005SB-7J for barebox@lists.infradead.org; Tue, 29 Jul 2014 20:11:06 +0000 Received: by mail-lb0-f169.google.com with SMTP id s7so141440lbd.28 for ; Tue, 29 Jul 2014 13:10:43 -0700 (PDT) From: Antony Pavlov Date: Wed, 30 Jul 2014 00:10:22 +0400 Message-Id: <1406664625-19653-7-git-send-email-antonynpavlov@gmail.com> In-Reply-To: <1406664625-19653-1-git-send-email-antonynpavlov@gmail.com> References: <1406664625-19653-1-git-send-email-antonynpavlov@gmail.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH v4 6/9] rtc-lib: import rtc_time_to_tm() from linux-3.15 To: barebox@lists.infradead.org Signed-off-by: Antony Pavlov --- drivers/rtc/rtc-lib.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/rtc.h | 1 + 2 files changed, 46 insertions(+) diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c index 0d6acde..1b23458 100644 --- a/drivers/rtc/rtc-lib.c +++ b/drivers/rtc/rtc-lib.c @@ -39,6 +39,51 @@ int rtc_month_days(unsigned int month, unsigned int year) EXPORT_SYMBOL(rtc_month_days); /* + * Convert seconds since 01-01-1970 00:00:00 to Gregorian date. + */ +void rtc_time_to_tm(unsigned long time, struct rtc_time *tm) +{ + unsigned int month, year; + int days; + + days = time / 86400; + time -= (unsigned int) days * 86400; + + /* day of the week, 1970-01-01 was a Thursday */ + tm->tm_wday = (days + 4) % 7; + + year = 1970 + days / 365; + days -= (year - 1970) * 365 + + LEAPS_THRU_END_OF(year - 1) + - LEAPS_THRU_END_OF(1970 - 1); + if (days < 0) { + year -= 1; + days += 365 + is_leap_year(year); + } + tm->tm_year = year - 1900; + tm->tm_yday = days + 1; + + for (month = 0; month < 11; month++) { + int newdays; + + newdays = days - rtc_month_days(month, year); + if (newdays < 0) + break; + days = newdays; + } + tm->tm_mon = month; + tm->tm_mday = days + 1; + + tm->tm_hour = time / 3600; + time -= tm->tm_hour * 3600; + tm->tm_min = time / 60; + tm->tm_sec = time - tm->tm_min * 60; + + tm->tm_isdst = 0; +} +EXPORT_SYMBOL(rtc_time_to_tm); + +/* * Does the rtc_time represent a valid date/time? */ int rtc_valid_tm(struct rtc_time *tm) diff --git a/include/linux/rtc.h b/include/linux/rtc.h index 2e034f6..2dacb14 100644 --- a/include/linux/rtc.h +++ b/include/linux/rtc.h @@ -17,6 +17,7 @@ extern int rtc_month_days(unsigned int month, unsigned int year); extern int rtc_valid_tm(struct rtc_time *tm); extern int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time); +extern void rtc_time_to_tm(unsigned long time, struct rtc_time *tm); struct rtc_class_ops; -- 2.0.1 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox