Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751735AbWCFBxh (ORCPT ); Sun, 5 Mar 2006 20:53:37 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751542AbWCFBxT (ORCPT ); Sun, 5 Mar 2006 20:53:19 -0500 Received: from 213-140-6-124.ip.fastwebnet.it ([213.140.6.124]:55679 "EHLO linux") by vger.kernel.org with ESMTP id S1751564AbWCFBxN (ORCPT ); Sun, 5 Mar 2006 20:53:13 -0500 Message-Id: <20060306015009.110961000@towertech.it> References: <20060306015008.858209000@towertech.it> User-Agent: quilt/0.43-1 Date: Mon, 06 Mar 2006 02:50:09 +0100 From: Alessandro Zummo To: linux-kernel@vger.kernel.org Cc: akpm@zip.com.au, akpm@digeo.com Subject: [PATCH 01/16] 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 Content-Length: 4929 Lines: 172 RTC and date/time related functions. Signed-off-by: Alessandro Zummo --- drivers/Kconfig | 2 + drivers/Makefile | 1 drivers/rtc/Kconfig | 6 +++ drivers/rtc/Makefile | 5 ++ drivers/rtc/rtc-lib.c | 99 ++++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/rtc.h | 5 ++ 6 files changed, 118 insertions(+) --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-rtc/drivers/rtc/rtc-lib.c 2006-03-05 02:49:51.000000000 +0100 @@ -0,0 +1,99 @@ +/* + * 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) +{ + register int days, month, year; + + days = time / 86400; + time -= 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 + 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); --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-rtc/drivers/rtc/Makefile 2006-03-05 02:48:31.000000000 +0100 @@ -0,0 +1,5 @@ +# +# Makefile for RTC class/drivers. +# + +obj-$(CONFIG_RTC_LIB) += rtc-lib.o --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-rtc/drivers/rtc/Kconfig 2006-03-05 02:48:31.000000000 +0100 @@ -0,0 +1,6 @@ +# +# RTC class/drivers configuration +# + +config RTC_LIB + bool \ No newline at end of file --- linux-rtc.orig/drivers/Kconfig 2006-03-05 02:38:14.000000000 +0100 +++ linux-rtc/drivers/Kconfig 2006-03-05 02:38:16.000000000 +0100 @@ -70,4 +70,6 @@ source "drivers/sn/Kconfig" source "drivers/edac/Kconfig" +source "drivers/rtc/Kconfig" + endmenu --- linux-rtc.orig/drivers/Makefile 2006-03-05 02:38:14.000000000 +0100 +++ linux-rtc/drivers/Makefile 2006-03-05 02:38:16.000000000 +0100 @@ -56,6 +56,7 @@ obj-$(CONFIG_USB_GADGET) += usb/gadget/ obj-$(CONFIG_GAMEPORT) += input/gameport/ obj-$(CONFIG_INPUT) += input/ obj-$(CONFIG_I2O) += message/ +obj-$(CONFIG_RTC_LIB) += rtc/ obj-$(CONFIG_I2C) += i2c/ obj-$(CONFIG_W1) += w1/ obj-$(CONFIG_HWMON) += hwmon/ --- linux-rtc.orig/include/linux/rtc.h 2006-03-05 02:38:14.000000000 +0100 +++ linux-rtc/include/linux/rtc.h 2006-03-05 02:48:31.000000000 +0100 @@ -95,6 +95,11 @@ struct rtc_pll_info { #ifdef __KERNEL__ +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); + typedef struct rtc_task { void (*func)(void *private_data); void *private_data; -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/