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rtc: optionally return raw time from RTC_Linux_ReadTime*

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For use with RCL_AddSample in the incoming RTC reference clock driver,
we'll want access not to the cooked timestamps, but to the raw ones.

Otherwise, the core reference clock code complains:

  (valid_sample_time) RTC0 refclock sample time 1721242673.092211891
    not valid age=-3.092007

Support both use cases by have the RTC_Linux_ReadTime_* functions take
two nullable pointers, one for cooked and the other for raw time.
This commit is contained in:
Ahmad Fatoum
2024-07-22 17:41:47 +02:00
committed by Miroslav Lichvar
parent a1191f8392
commit 65be9d9a02
2 changed files with 17 additions and 8 deletions
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19
rtc_linux.c
View File

@@ -786,7 +786,9 @@ RTC_Linux_CheckInterrupt(int fd)
}
time_t
RTC_Linux_ReadTimeAfterInterrupt(int fd, int utc, struct timespec *sys_time_cooked)
RTC_Linux_ReadTimeAfterInterrupt(int fd, int utc,
struct timespec *sys_time_cooked,
struct timespec *sys_time_raw)
{
int status;
struct rtc_time rtc_raw;
@@ -794,7 +796,7 @@ RTC_Linux_ReadTimeAfterInterrupt(int fd, int utc, struct timespec *sys_time_cook
/* Read RTC time, sandwiched between two polls of the system clock
so we can bound any error */
SCH_GetLastEventTime(sys_time_cooked, NULL, NULL);
SCH_GetLastEventTime(sys_time_cooked, NULL, sys_time_raw);
status = ioctl(fd, RTC_RD_TIME, &rtc_raw);
if (status < 0) {
@@ -825,7 +827,7 @@ read_from_device(int fd_, int event, void *any)
return;
}
rtc_t = RTC_Linux_ReadTimeAfterInterrupt(fd, rtc_on_utc, &sys_time);
rtc_t = RTC_Linux_ReadTimeAfterInterrupt(fd, rtc_on_utc, &sys_time, NULL);
if (rtc_t == (time_t)-1) {
error = 1;
goto turn_off_interrupt;
@@ -930,7 +932,9 @@ RTC_Linux_WriteParameters(void)
}
time_t
RTC_Linux_ReadTimeNow(int fd, int utc, struct timespec *old_sys_time)
RTC_Linux_ReadTimeNow(int fd, int utc,
struct timespec *old_sys_cooked,
struct timespec *old_sys_raw)
{
struct rtc_time rtc_raw, rtc_raw_retry;
int status;
@@ -946,7 +950,10 @@ RTC_Linux_ReadTimeNow(int fd, int utc, struct timespec *old_sys_time)
} while (status >= 0 && rtc_raw.tm_sec != rtc_raw_retry.tm_sec);
/* Read system clock */
LCL_ReadCookedTime(old_sys_time, NULL);
if (old_sys_raw)
LCL_ReadRawTime(old_sys_raw);
if (old_sys_cooked)
LCL_ReadCookedTime(old_sys_cooked, NULL);
return status >= 0 ? t_from_rtc(&rtc_raw, utc) : -1;
}
@@ -976,7 +983,7 @@ RTC_Linux_TimePreInit(time_t driftfile_time)
return 0; /* Can't open it, and won't be able to later */
}
rtc_t = RTC_Linux_ReadTimeNow(fd, rtc_on_utc, &old_sys_time);
rtc_t = RTC_Linux_ReadTimeNow(fd, rtc_on_utc, &old_sys_time, NULL);
close(fd);

6
rtc_linux.h
View File

@@ -45,8 +45,10 @@ extern void RTC_Linux_CycleLogFile(void);
extern int RTC_Linux_SwitchInterrupt(int fd, int on_off);
extern int RTC_Linux_CheckInterrupt(int fd);
extern time_t RTC_Linux_ReadTimeAfterInterrupt(int fd, int utc,
struct timespec *sys_time_cooked);
struct timespec *sys_time_cooked,
struct timespec *sys_time_raw);
extern time_t RTC_Linux_ReadTimeNow(int fd, int utc,
struct timespec *sys_time_cooked);
struct timespec *sys_time_cooked,
struct timespec *sys_time_raw);
#endif /* _GOT_RTC_LINUX_H */