From 39a8cbd9ca051fb164db70315e7972de5c153c33 Mon Sep 17 00:00:00 2001
From: Richard Cochran <richardcochran@gmail.com>
Date: Sat, 22 Sep 2012 07:02:01 +0000
Subject: 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>
---
 drivers/ptp/ptp_clock.c   | 1 +
 drivers/ptp/ptp_private.h | 1 +
 2 files changed, 2 insertions(+)

(limited to 'drivers/ptp')

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;
-- 
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