mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 20:48:49 +08:00
45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
|
/*
|
||
|
|
* 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>
|
||
|
|
#include <linux/time.h>
|
||
|
|
|
||
|
|
/**
|
||
|
|
* rtc_set_ntp_time - Save NTP synchronized time to the RTC
|
||
|
|
* @now: Current time of day
|
||
|
|
*
|
||
|
|
* Replacement for the NTP platform function update_persistent_clock
|
||
|
|
* that stores time for later retrieval by rtc_hctosys.
|
||
|
|
*
|
||
|
|
* Returns 0 on successful RTC update, -ENODEV if a RTC update is not
|
||
|
|
* possible at all, and various other -errno for specific temporary failure
|
||
|
|
* cases.
|
||
|
|
*
|
||
|
|
* If temporary failure is indicated the caller should try again 'soon'
|
||
|
|
*/
|
||
|
|
int rtc_set_ntp_time(struct timespec now)
|
||
|
|
{
|
||
|
|
struct rtc_device *rtc;
|
||
|
|
struct rtc_time tm;
|
||
|
|
int err = -ENODEV;
|
||
|
|
|
||
|
|
if (now.tv_nsec < (NSEC_PER_SEC >> 1))
|
||
|
|
rtc_time_to_tm(now.tv_sec, &tm);
|
||
|
|
else
|
||
|
|
rtc_time_to_tm(now.tv_sec + 1, &tm);
|
||
|
|
|
||
|
|
rtc = rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);
|
||
|
|
if (rtc) {
|
||
|
|
/* rtc_hctosys exclusively uses UTC, so we call set_time here,
|
||
|
|
* not set_mmss. */
|
||
|
|
if (rtc->ops && (rtc->ops->set_time || rtc->ops->set_mmss))
|
||
|
|
err = rtc_set_time(rtc, &tm);
|
||
|
|
rtc_class_close(rtc);
|
||
|
|
}
|
||
|
|
|
||
|
|
return err;
|
||
|
|
}
|