[PATCH 01/13] RTC Subsystem, library functions

Alessandro Zummo
2006-03-04T16:44:19Z

[-- Attachment #1: rtc-lib.patch --]
[-- Type: text/plain, Size: 4733 bytes --]

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 | 7 +++
drivers/rtc/rtc-lib.c | 99 ++++++++++++++++++++++++++++++++++++++++++++++++++
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 2006-02-28 13:23:08.000000000 +0100
@@ -0,0 +1,99 @@
+/*
+ * 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 as published by
+ * the Free Software Foundation; version 2 of the License.
+*/
+
+#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);
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-rtc/drivers/rtc/Makefile 2006-02-28 13:16:36.000000000 +0100
@@ -0,0 +1,7 @@
+#
+# Makefile for RTC class/drivers.
+#
+
+ifneq ($(CONFIG_RTC_LIB), n)
+obj-y += rtc-lib.o
+endif
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-rtc/drivers/rtc/Kconfig 2006-02-28 13:16:36.000000000 +0100
@@ -0,0 +1,6 @@
+#
+# RTC class/drivers configuration
+#
+
+config RTC_LIB
+ bool
\ No newline at end of file
--- linux-rtc.orig/drivers/Kconfig 2006-02-28 13:16:34.000000000 +0100
+++ linux-rtc/drivers/Kconfig 2006-02-28 13:16:36.000000000 +0100
@@ -70,4 +70,6 @@ source "drivers/sn/Kconfig"

source "drivers/edac/Kconfig"

+source "drivers/rtc/Kconfig"
+
endmenu
--- linux-rtc.orig/drivers/Makefile 2006-02-28 13:16:34.000000000 +0100
+++ linux-rtc/drivers/Makefile 2006-02-28 13:16:36.000000000 +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-y += rtc/
obj-$(CONFIG_I2C) += i2c/
obj-$(CONFIG_W1) += w1/
obj-$(CONFIG_HWMON) += hwmon/
--- linux-rtc.orig/include/linux/rtc.h 2006-02-28 13:16:34.000000000 +0100
+++ linux-rtc/include/linux/rtc.h 2006-02-28 13:16:36.000000000 +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;

--