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Add nanosecond slewing to Linux driver

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For offset adjustments below 10 microseconds use kernel PLL with
locked frequency and 1s time constant.
This commit is contained in:
Miroslav Lichvar
2010-08-05 19:15:45 +02:00
parent 7994b31de4
commit cb28aeeacc
4 changed files with 155 additions and 12 deletions
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4
chrony_timex.h
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@@ -35,9 +35,12 @@ struct timex {
int :32; int :32; int :32; int :32;
};
#define ADJ_OFFSET 0x0001 /* time offset */
#define ADJ_FREQUENCY 0x0002 /* frequency offset */
#define ADJ_MAXERROR 0x0004 /* maximum time error */
#define ADJ_STATUS 0x0010 /* clock status */
#define ADJ_TIMECONST 0x0020 /* pll time constant */
#define ADJ_NANO 0x2000 /* select nanosecond resolution */
#define ADJ_TICK 0x4000 /* tick value */
#define ADJ_OFFSET_SINGLESHOT 0x8001 /* old-fashioned adjtime */
#define ADJ_OFFSET_SS_READ 0xa001 /* read-only adjtime */
@@ -60,6 +63,7 @@ struct timex {
#define STA_PPSERROR 0x0800 /* PPS signal calibration error (ro) */
#define STA_CLOCKERR 0x1000 /* clock hardware fault (ro) */
#define STA_NANO 0x2000 /* resolution (0 = us, 1 = ns) (ro) */
/* This doesn't seem to be in any include files !! */