Re: [PATCH 01/18] RTC Subsystem, library functions

Kumar Gala
2006-03-20T19:17:50Z

On Mar 18, 2006, at 11:19 AM, Alessandro Zummo wrote:

> RTC and date/time related functions.
>
> Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
> ---
> drivers/Kconfig | 2
> drivers/Makefile | 1
> drivers/rtc/Kconfig | 6 ++
> drivers/rtc/Makefile | 5 ++
> drivers/rtc/rtc-lib.c | 101 ++++++++++++++++++++++++++++++++++++++
> ++++++++++++
> include/linux/rtc.h | 5 ++
> 6 files changed, 120 insertions(+)
>
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ linux-rtc/drivers/rtc/rtc-lib.c 2006-03-13 03:26:29.000000000
> +0100
> @@ -0,0 +1,101 @@
> +/*
> + * 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")

you are missing a ';' for MODULE_LICENSE.

[snip]

- kumar