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authorRichard Cochran <richardcochran@gmail.com>2012-09-22 07:02:01 +0000
committerDavid S. Miller <davem@davemloft.net>2012-09-22 15:41:29 -0400
commit39a8cbd9ca051fb164db70315e7972de5c153c33 (patch)
treec273bdec9420a47bf34a6e8985b102481d41bca3
parent717ecc276dadf31cd858d4e56ac71c3cc479fc19 (diff)
downloadlinux-39a8cbd9ca051fb164db70315e7972de5c153c33.tar.bz2
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 <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/ptp/ptp_clock.c1
-rw-r--r--drivers/ptp/ptp_private.h1
2 files changed, 2 insertions, 0 deletions
diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index 966875dcda56..67e628ee0365 100644
--- 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
index 4d5b5082c3b1..69d32070cc65 100644
--- 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;