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author | Antony Pavlov <antonynpavlov@gmail.com> | 2014-07-30 00:10:18 +0400 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2014-07-31 07:30:51 +0200 |
commit | ed98f1522d2157a0266095b00ab1481da6085337 (patch) | |
tree | c84e29e556e102fe2548688123da19cba8a23c38 /drivers/rtc/rtc-lib.c | |
parent | 6d3fc76b7720c6eeb5f38cce32290cbbe28ae146 (diff) | |
download | barebox-ed98f1522d2157a0266095b00ab1481da6085337.tar.gz barebox-ed98f1522d2157a0266095b00ab1481da6085337.tar.xz |
Add a simple rtc framework
This patch adds a simple rtc framework
for reading and setting board's RTC time.
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/rtc/rtc-lib.c')
-rw-r--r-- | drivers/rtc/rtc-lib.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c new file mode 100644 index 0000000000..0d6acde3e0 --- /dev/null +++ b/drivers/rtc/rtc-lib.c @@ -0,0 +1,68 @@ +/* + * rtc and date/time utility functions + * + * This code was ported from linux-3.15 kernel by Antony Pavlov. + * + * 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 <rtc.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 +}; + +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 } +}; + +#define LEAPS_THRU_END_OF(y) ((y)/4 - (y)/100 + (y)/400) + +/* + * The number of days in the month. + */ +int rtc_month_days(unsigned int month, unsigned int year) +{ + return rtc_days_in_month[month] + (is_leap_year(year) && month == 1); +} +EXPORT_SYMBOL(rtc_month_days); + +/* + * Does the rtc_time represent a valid date/time? + */ +int rtc_valid_tm(struct rtc_time *tm) +{ + if (tm->tm_year < 70 + || ((unsigned)tm->tm_mon) >= 12 + || tm->tm_mday < 1 + || tm->tm_mday > rtc_month_days(tm->tm_mon, tm->tm_year + 1900) + || ((unsigned)tm->tm_hour) >= 24 + || ((unsigned)tm->tm_min) >= 60 + || ((unsigned)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); |