[PATCH] RTC Subsystem: library functions (c58411e9) · Commits · 戴 / test

drivers/Kconfig

+2 −0

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		@@ -70,4 +70,6 @@ source "drivers/sn/Kconfig"

		source "drivers/edac/Kconfig"

		source "drivers/rtc/Kconfig"

		endmenu

drivers/Makefile

+1 −0

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		@@ -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/

drivers/rtc/Kconfig

0 → 100644

+6 −0

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		#
		# RTC class/drivers configuration
		#

		config RTC_LIB
		tristate
		No newline at end of file

drivers/rtc/Makefile

0 → 100644

+5 −0

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		#
		# Makefile for RTC class/drivers.
		#

		obj-$(CONFIG_RTC_LIB) += rtc-lib.o

drivers/rtc/rtc-lib.c

0 → 100644

+101 −0

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		/*
		* rtc and date/time utility functions
		*
		* Copyright (C) 2005-06 Tower Technologies
		* Author: Alessandro Zummo <a.zummo@towertech.it>
		*
		* 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 version 2 as
		* published by the Free Software Foundation.
		*/

		#include <linux/module.h>
		#include <linux/rtc.h>

		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);

		MODULE_LICENSE("GPL");

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