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drivers/rtc/rtc-lib.c
3.31 KB
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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 }; |
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static const unsigned short rtc_ydays[2][13] = { /* Normal years */ { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, /* Leap years */ { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 } }; |
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#define LEAPS_THRU_END_OF(y) ((y)/4 - (y)/100 + (y)/400) |
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/* * The number of days in the month. */ |
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int rtc_month_days(unsigned int month, unsigned int year) { |
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return rtc_days_in_month[month] + (is_leap_year(year) && month == 1); |
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} EXPORT_SYMBOL(rtc_month_days); /* |
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* The number of days since January 1. (0 to 365) */ int rtc_year_days(unsigned int day, unsigned int month, unsigned int year) { |
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return rtc_ydays[is_leap_year(year)][month] + day-1; |
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} EXPORT_SYMBOL(rtc_year_days); /* |
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* Convert seconds since 01-01-1970 00:00:00 to Gregorian date. */ void rtc_time_to_tm(unsigned long time, struct rtc_time *tm) { |
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unsigned int month, year; int days; |
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days = time / 86400; |
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time -= (unsigned int) days * 86400; |
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/* 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; |
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days += 365 + is_leap_year(year); |
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} 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; |
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tm->tm_isdst = 0; |
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} 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 |
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|| ((unsigned)tm->tm_mon) >= 12 |
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|| tm->tm_mday < 1 || tm->tm_mday > rtc_month_days(tm->tm_mon, tm->tm_year + 1900) |
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|| ((unsigned)tm->tm_hour) >= 24 || ((unsigned)tm->tm_min) >= 60 || ((unsigned)tm->tm_sec) >= 60) |
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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); |
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/* * Convert rtc_time to ktime */ ktime_t rtc_tm_to_ktime(struct rtc_time tm) { time_t time; rtc_tm_to_time(&tm, &time); return ktime_set(time, 0); } EXPORT_SYMBOL_GPL(rtc_tm_to_ktime); /* * Convert ktime to rtc_time */ struct rtc_time rtc_ktime_to_tm(ktime_t kt) { struct timespec ts; struct rtc_time ret; ts = ktime_to_timespec(kt); /* Round up any ns */ if (ts.tv_nsec) ts.tv_sec++; rtc_time_to_tm(ts.tv_sec, &ret); return ret; } EXPORT_SYMBOL_GPL(rtc_ktime_to_tm); |
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MODULE_LICENSE("GPL"); |