ntp: NTP4 user space bits update

This adds a few more things from the ntp nanokernel related to user space.
It's now possible to select the resolution used of some values via STA_NANO
and the kernel reports in which mode it works (pll/fll).

If some values for adjtimex() are outside the acceptable range, they are now
simply normalized instead of letting the syscall fail.  I removed
MOD_CLKA/MOD_CLKB as the mapping didn't really makes any sense, the kernel
doesn't support setting the clock.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 9 insertions, 3 deletions

diff --git a/include/linux/timex.h b/include/linux/timex.h
index 8ea3e71ba7f..3c49d173bf3 100644
--- a/include/linux/timex.h
+++ b/include/linux/timex.h
@@ -58,6 +58,8 @@
 
 #include <asm/param.h>
 
+#define NTP_API         4       /* NTP API version */
+
 /*
  * SHIFT_KG and SHIFT_KF establish the damping of the PLL and are chosen
  * for a slightly underdamped convergence characteristic. SHIFT_KH
@@ -135,6 +137,8 @@ struct timex {
 #define ADJ_ESTERROR            0x0008  /* estimated time error */
 #define ADJ_STATUS              0x0010  /* clock status */
 #define ADJ_TIMECONST           0x0020  /* pll time constant */
+#define ADJ_MICRO               0x1000  /* select microsecond resolution */
+#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 */
@@ -146,8 +150,6 @@ struct timex {
 #define MOD_ESTERROR    ADJ_ESTERROR
 #define MOD_STATUS      ADJ_STATUS
 #define MOD_TIMECONST   ADJ_TIMECONST
-#define MOD_CLKB        ADJ_TICK
-#define MOD_CLKA        ADJ_OFFSET_SINGLESHOT /* 0x8000 in original */
 
 
 /*
@@ -169,9 +171,13 @@ 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) */
+#define STA_MODE        0x4000  /* mode (0 = PLL, 1 = FLL) (ro) */
+#define STA_CLK         0x8000  /* clock source (0 = A, 1 = B) (ro) */
 
+/* read-only bits */
 #define STA_RONLY (STA_PPSSIGNAL | STA_PPSJITTER | STA_PPSWANDER | \
-    STA_PPSERROR | STA_CLOCKERR) /* read-only bits */
+        STA_PPSERROR | STA_CLOCKERR | STA_NANO | STA_MODE | STA_CLK)
 
 /*
  * Clock states (time_state)