Adds in-kernel hctosys functionality that can
be used by ntp sync code.
This is an RFC and has not been tested, I just want
to check if something similar could solve the problems
of those who want the NTP sync mode.
Signed-off-by: Alessandro Zummo <[EMAIL PROTECTED]>
Cc: Paul Mundt <[EMAIL PROTECTED]>
Cc: David Brownell <[EMAIL PROTECTED]>
Cc: David Woodhouse <[EMAIL PROTECTED]>
---
drivers/rtc/Kconfig | 19 ++++++++++++++++++-
drivers/rtc/Makefile | 1 +
drivers/rtc/systohc.c | 35 +++++++++++++++++++++++++++++++++++
3 files changed, 54 insertions(+), 1 deletions(-)
create mode 100644 drivers/rtc/systohc.c
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 8abbb20..1ff9427 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -30,7 +30,7 @@ config RTC_HCTOSYS
unnecessary fsck runs at boot time, and to network better.
config RTC_HCTOSYS_DEVICE
- string "RTC used to set the system time"
+ string "RTC used to set the system time on startup and resume"
depends on RTC_HCTOSYS = y
default "rtc0"
help
@@ -52,6 +52,23 @@ config RTC_HCTOSYS_DEVICE
sleep states. Do not specify an RTC here unless it stays powered
during all this system's supported sleep states.
+config RTC_SYSTOHC
+ bool "Set RTC from system time in NTP sync mode"
+ depends on RTC_CLASS = y
+ default y
+ help
+ If you say yes here, the system time (wall clock) will be written
+ to the hardware clock every 11 minutes, if the kernel is in NTP
+ mode and your platforms supports it.
+
+config RTC_SYSTOHC_DEVICE
+ string "RTC used to save the system time in NTP sync mode"
+ depends on RTC_SYSTOHC = y
+ default "rtc0"
+ help
+ The RTC device that will get written with the system time
+ in NTP mode.
+
config RTC_DEBUG
bool "RTC debug support"
depends on RTC_CLASS = y
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index e9e8474..6d1c519 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -8,6 +8,7 @@ endif
obj-$(CONFIG_RTC_LIB) += rtc-lib.o
obj-$(CONFIG_RTC_HCTOSYS) += hctosys.o
+obj-$(CONFIG_RTC_SYSTOHC) += systohc.o
obj-$(CONFIG_RTC_CLASS) += rtc-core.o
rtc-core-y := class.o interface.o
diff --git a/drivers/rtc/systohc.c b/drivers/rtc/systohc.c
new file mode 100644
index 0000000..41ec77b
--- /dev/null
+++ b/drivers/rtc/systohc.c
@@ -0,0 +1,35 @@
+/*
+ * RTC subsystem, systohc for ntp use
+ *
+ * Copyright (C) 2008 Tower Technologies
+ * Author: Alessandro Zummo <[EMAIL PROTECTED]>
+ *
+ * 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/rtc.h>
+
+static int rtc_systohc(struct rtc_time *tm)
+{
+ int err;
+ struct rtc_time tm;
+ struct rtc_device *rtc = rtc_class_open(CONFIG_RTC_SYSTOHC_DEVICE);
+
+ if (rtc == NULL) {
+ printk("%s: unable to open rtc device (%s)\n",
+ __FILE__, CONFIG_RTC_SYSTOHC_DEVICE);
+ return -ENODEV;
+ }
+
+ err = rtc_set_time(rtc, tm);
+ if (err != 0)
+ dev_err(rtc->dev.parent,
+ "systohc: unable to set the hardware clock\n");
+
+ rtc_class_close(rtc);
+
+ return err;
+}
+EXPORT_SYMBOL(rtc_systohc);
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