/* * 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; }