| /* |
| * 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_clock64 |
| * 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 timespec64 now) |
| { |
| struct rtc_device *rtc; |
| struct rtc_time tm; |
| int err = -ENODEV; |
| |
| if (now.tv_nsec < (NSEC_PER_SEC >> 1)) |
| rtc_time64_to_tm(now.tv_sec, &tm); |
| else |
| rtc_time64_to_tm(now.tv_sec + 1, &tm); |
| |
| rtc = rtc_class_open(CONFIG_RTC_SYSTOHC_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_mmss64 || |
| rtc->ops->set_mmss)) |
| err = rtc_set_time(rtc, &tm); |
| rtc_class_close(rtc); |
| } |
| |
| return err; |
| } |