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8e4ff1a81a
Currently the rtc_class_op's set_mmss() function takes a 32-bit second value (on 32-bit systems), which is problematic for dates past y2038. This patch provides a safe version named set_mmss64() using y2038 safe time64_t. After this patch, set_mmss() is deprecated and all its users will be fixed to use set_mmss64(), it can be removed when having no users. Signed-off-by: Xunlei Pang <pang.xunlei@linaro.org> [jstultz: Add whitespace fix for checkpatch] Signed-off-by: John Stultz <john.stultz@linaro.org> Acked-by: Alessandro Zummo <a.zummo@towertech.it> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1427945681-29972-8-git-send-email-john.stultz@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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*/
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#include <linux/rtc.h>
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#include <linux/time.h>
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/**
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* rtc_set_ntp_time - Save NTP synchronized time to the RTC
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* @now: Current time of day
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*
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* Replacement for the NTP platform function update_persistent_clock64
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* that stores time for later retrieval by rtc_hctosys.
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*
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* Returns 0 on successful RTC update, -ENODEV if a RTC update is not
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* possible at all, and various other -errno for specific temporary failure
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* cases.
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*
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* If temporary failure is indicated the caller should try again 'soon'
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*/
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int rtc_set_ntp_time(struct timespec64 now)
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{
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struct rtc_device *rtc;
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struct rtc_time tm;
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int err = -ENODEV;
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if (now.tv_nsec < (NSEC_PER_SEC >> 1))
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rtc_time64_to_tm(now.tv_sec, &tm);
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else
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rtc_time64_to_tm(now.tv_sec + 1, &tm);
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rtc = rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);
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if (rtc) {
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/* rtc_hctosys exclusively uses UTC, so we call set_time here,
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* not set_mmss. */
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if (rtc->ops &&
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(rtc->ops->set_time ||
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rtc->ops->set_mmss64 ||
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rtc->ops->set_mmss))
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err = rtc_set_time(rtc, &tm);
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rtc_class_close(rtc);
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}
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return err;
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}
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