[linux-2.6-block.git] / drivers / rtc / systohc.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_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;
}
Commit	Line	Data
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	}