Commit | Line | Data |
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023f333a JG |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify it | |
3 | * under the terms of the GNU General Public License version 2 as published by | |
4 | * the Free Software Foundation. | |
5 | * | |
6 | */ | |
7 | #include <linux/rtc.h> | |
8 | #include <linux/time.h> | |
9 | ||
10 | /** | |
11 | * rtc_set_ntp_time - Save NTP synchronized time to the RTC | |
12 | * @now: Current time of day | |
13 | * | |
3c00a1fe | 14 | * Replacement for the NTP platform function update_persistent_clock64 |
023f333a JG |
15 | * that stores time for later retrieval by rtc_hctosys. |
16 | * | |
17 | * Returns 0 on successful RTC update, -ENODEV if a RTC update is not | |
18 | * possible at all, and various other -errno for specific temporary failure | |
19 | * cases. | |
20 | * | |
21 | * If temporary failure is indicated the caller should try again 'soon' | |
22 | */ | |
9a4a445e | 23 | int rtc_set_ntp_time(struct timespec64 now) |
023f333a JG |
24 | { |
25 | struct rtc_device *rtc; | |
26 | struct rtc_time tm; | |
27 | int err = -ENODEV; | |
28 | ||
29 | if (now.tv_nsec < (NSEC_PER_SEC >> 1)) | |
9a4a445e | 30 | rtc_time64_to_tm(now.tv_sec, &tm); |
023f333a | 31 | else |
9a4a445e | 32 | rtc_time64_to_tm(now.tv_sec + 1, &tm); |
023f333a | 33 | |
9c5150b3 | 34 | rtc = rtc_class_open(CONFIG_RTC_SYSTOHC_DEVICE); |
023f333a JG |
35 | if (rtc) { |
36 | /* rtc_hctosys exclusively uses UTC, so we call set_time here, | |
37 | * not set_mmss. */ | |
8e4ff1a8 XP |
38 | if (rtc->ops && |
39 | (rtc->ops->set_time || | |
40 | rtc->ops->set_mmss64 || | |
41 | rtc->ops->set_mmss)) | |
023f333a JG |
42 | err = rtc_set_time(rtc, &tm); |
43 | rtc_class_close(rtc); | |
44 | } | |
45 | ||
46 | return err; | |
47 | } |