ptp: remember the adjusted frequency

This patch adds a field to the representation of a PTP hardware clock in order to remember the frequency adjustment value dialed by the user. Adding this field will let us answer queries in the manner of adjtimex in a follow on patch. Signed-off-by: Richard Cochran <[email protected]> Signed-off-by: David S. Miller <[email protected]>
rtvt123 · Sep 22, 2012 · 39a8cbd · 39a8cbd
1 parent 717ecc2
commit 39a8cbd
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diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
@@ -147,6 +147,7 @@ static int ptp_clock_adjtime(struct posix_clock *pc, struct timex *tx)
 	} else if (tx->modes & ADJ_FREQUENCY) {
 
 		err = ops->adjfreq(ops, scaled_ppm_to_ppb(tx->freq));
+		ptp->dialed_frequency = tx->freq;
 	}
 
 	return err;

diff --git a/drivers/ptp/ptp_private.h b/drivers/ptp/ptp_private.h
@@ -45,6 +45,7 @@ struct ptp_clock {
 	dev_t devid;
 	int index; /* index into clocks.map */
 	struct pps_device *pps_source;
+	long dialed_frequency; /* remembers the frequency adjustment */
 	struct timestamp_event_queue tsevq; /* simple fifo for time stamps */
 	struct mutex tsevq_mux; /* one process at a time reading the fifo */
 	wait_queue_head_t tsev_wq;