From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751426AbWBZXOu (ORCPT ); Sun, 26 Feb 2006 18:14:50 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751425AbWBZXOu (ORCPT ); Sun, 26 Feb 2006 18:14:50 -0500 Received: from 213-140-6-124.ip.fastwebnet.it ([213.140.6.124]:28709 "EHLO linux") by vger.kernel.org with ESMTP id S1751426AbWBZXOt (ORCPT ); Sun, 26 Feb 2006 18:14:49 -0500 Message-Id: <20060226231438.517421000@towertech.it> References: <20060226231438.307751000@towertech.it> User-Agent: quilt/0.43-1 Date: Mon, 27 Feb 2006 00:14:39 +0100 From: Alessandro Zummo To: linux-kernel@vger.kernel.org Subject: [PATCH 01/13] RTC Subsystem, library functions Content-Disposition: inline; filename=rtc-lib.patch Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org RTC and date/time related functions. Signed-off-by: Alessandro Zummo --- lib/Makefile | 2 - lib/rtc.c | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 99 insertions(+), 1 deletion(-) --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-rtc/lib/rtc.c 2006-02-26 22:03:21.000000000 +0100 @@ -0,0 +1,98 @@ +/* + * rtc and date/time utility functions + * + * Copyright (C) 2005-06 Tower Technologies + * Author: Alessandro Zummo + * + * based on arch/arm/common/rtctime.c and other bits + * + * 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; version 2 of the License. +*/ + +#include +#include + +static const unsigned char rtc_days_in_month[] = { + 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 +}; + +#define LEAPS_THRU_END_OF(y) ((y)/4 - (y)/100 + (y)/400) +#define LEAP_YEAR(year) ((!(year % 4) && (year % 100)) || !(year % 400)) + +int rtc_month_days(unsigned int month, unsigned int year) +{ + return rtc_days_in_month[month] + (LEAP_YEAR(year) && month == 1); +} +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) +{ + int days, month, year; + + days = time / 86400; + time -= days * 86400; + + 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 + 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; +} +EXPORT_SYMBOL(rtc_time_to_tm); + +/* + * Does the rtc_time represent a valid date/time? + */ +int rtc_valid_tm(struct rtc_time *tm) +{ + if (tm->tm_year < 70 || + tm->tm_mon >= 12 || + tm->tm_mday < 1 || + tm->tm_mday > rtc_month_days(tm->tm_mon, tm->tm_year + 1900) || + tm->tm_hour >= 24 || + tm->tm_min >= 60 || + tm->tm_sec >= 60) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL(rtc_valid_tm); + +/* + * Convert Gregorian date to seconds since 01-01-1970 00:00:00. + */ +int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time) +{ + *time = mktime(tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, + tm->tm_hour, tm->tm_min, tm->tm_sec); + return 0; +} +EXPORT_SYMBOL(rtc_tm_to_time); --- linux-rtc.orig/lib/Makefile 2006-02-26 21:49:51.000000000 +0100 +++ linux-rtc/lib/Makefile 2006-02-26 21:52:09.000000000 +0100 @@ -5,7 +5,7 @@ lib-y := errno.o ctype.o string.o vsprintf.o cmdline.o \ bust_spinlocks.o rbtree.o radix-tree.o dump_stack.o \ idr.o div64.o int_sqrt.o bitmap.o extable.o prio_tree.o \ - sha1.o + sha1.o rtc.o lib-y += kobject.o kref.o kobject_uevent.o klist.o --