72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
/*
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* Common code to keep time when machine suspends.
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*
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* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
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*
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* GPLv2
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*/
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#include <linux/time.h>
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#include <linux/sysdev.h>
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#include <asm/rtc.h>
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static unsigned long suspend_rtc_time;
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/*
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* Reset the time after a sleep.
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*/
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static int timer_resume(struct sys_device *dev)
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{
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struct timeval tv;
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struct timespec ts;
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struct rtc_time cur_rtc_tm;
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unsigned long cur_rtc_time, diff;
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/* get current RTC time and convert to seconds */
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get_rtc_time(&cur_rtc_tm);
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rtc_tm_to_time(&cur_rtc_tm, &cur_rtc_time);
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diff = cur_rtc_time - suspend_rtc_time;
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/* adjust time of day by seconds that elapsed while
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* we were suspended */
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do_gettimeofday(&tv);
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ts.tv_sec = tv.tv_sec + diff;
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ts.tv_nsec = tv.tv_usec * NSEC_PER_USEC;
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do_settimeofday(&ts);
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return 0;
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}
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static int timer_suspend(struct sys_device *dev, pm_message_t state)
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{
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struct rtc_time suspend_rtc_tm;
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WARN_ON(!ppc_md.get_rtc_time);
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get_rtc_time(&suspend_rtc_tm);
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rtc_tm_to_time(&suspend_rtc_tm, &suspend_rtc_time);
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return 0;
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}
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static struct sysdev_class timer_sysclass = {
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.resume = timer_resume,
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.suspend = timer_suspend,
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set_kset_name("timer"),
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};
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static struct sys_device device_timer = {
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.id = 0,
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.cls = &timer_sysclass,
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};
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static int time_init_device(void)
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{
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int error = sysdev_class_register(&timer_sysclass);
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if (!error)
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error = sysdev_register(&device_timer);
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return error;
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}
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device_initcall(time_init_device);
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