summaryrefslogtreecommitdiffstats
path: root/drivers/rtc
diff options
context:
space:
mode:
authorAntony Pavlov <antonynpavlov@gmail.com>2014-07-30 00:10:18 +0400
committerSascha Hauer <s.hauer@pengutronix.de>2014-07-31 07:30:51 +0200
commited98f1522d2157a0266095b00ab1481da6085337 (patch)
treec84e29e556e102fe2548688123da19cba8a23c38 /drivers/rtc
parent6d3fc76b7720c6eeb5f38cce32290cbbe28ae146 (diff)
downloadbarebox-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')
-rw-r--r--drivers/rtc/Kconfig15
-rw-r--r--drivers/rtc/Makefile6
-rw-r--r--drivers/rtc/class.c70
-rw-r--r--drivers/rtc/rtc-lib.c68
4 files changed, 159 insertions, 0 deletions
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
new file mode 100644
index 0000000000..540150373d
--- /dev/null
+++ b/drivers/rtc/Kconfig
@@ -0,0 +1,15 @@
+#
+# RTC class/drivers configuration
+#
+
+config RTC_LIB
+ bool
+
+menuconfig RTC_CLASS
+ bool "Real Time Clock"
+ default n
+ select RTC_LIB
+ help
+ Generic RTC class support. If you say yes here, you will
+ be allowed to plug one or more RTCs to your system. You will
+ probably want to enable one or more of the interfaces below.
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
new file mode 100644
index 0000000000..7d1b5bc8c8
--- /dev/null
+++ b/drivers/rtc/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for RTC class/drivers.
+#
+
+obj-$(CONFIG_RTC_LIB) += rtc-lib.o
+obj-$(CONFIG_RTC_CLASS) += class.o
diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
new file mode 100644
index 0000000000..356707be2f
--- /dev/null
+++ b/drivers/rtc/class.c
@@ -0,0 +1,70 @@
+/*
+ * RTC barebox subsystem, base class
+ *
+ * Copyright (C) 2014 Antony Pavlov <antonynpavlov@gmail.com>
+ *
+ * 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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/err.h>
+#include <rtc.h>
+#include <linux/rtc.h>
+
+LIST_HEAD(rtc_list);
+EXPORT_SYMBOL(rtc_list);
+
+struct rtc_device *rtc_lookup(const char *name)
+{
+ struct rtc_device *r;
+
+ if (!name)
+ return ERR_PTR(-ENODEV);
+
+ list_for_each_entry(r, &rtc_list, list) {
+ if (!strcmp(dev_name(&r->class_dev), name))
+ return r;
+ }
+
+ return ERR_PTR(-ENODEV);
+}
+EXPORT_SYMBOL(rtc_lookup);
+
+int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm)
+{
+ return rtc->ops->read_time(rtc, tm);
+}
+EXPORT_SYMBOL(rtc_read_time);
+
+int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm)
+{
+ return rtc->ops->set_time(rtc, tm);
+}
+EXPORT_SYMBOL(rtc_set_time);
+
+int rtc_register(struct rtc_device *rtcdev)
+{
+ struct device_d *dev = &rtcdev->class_dev;
+
+ if (!rtcdev->ops)
+ return -EINVAL;
+
+ dev->id = DEVICE_ID_DYNAMIC;
+ strcpy(dev->name, "rtc");
+ if (rtcdev->dev)
+ dev->parent = rtcdev->dev;
+ platform_device_register(dev);
+
+ list_add_tail(&rtcdev->list, &rtc_list);
+
+ return 0;
+}
+EXPORT_SYMBOL(rtc_register);
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);