ptp: add kernel API ptp_convert_timestamp()

Add kernel API ptp_convert_timestamp() to convert raw hardware timestamp
to a specified ptp vclock time.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/ptp/ptp_vclock.c b/drivers/ptp/ptp_vclock.c
index cefab29..e0f87c5 100644 (file)
--- a/drivers/ptp/ptp_vclock.c
+++ b/drivers/ptp/ptp_vclock.c
@@ -183,3 +183,37 @@ out:
        return num;
 }
 EXPORT_SYMBOL(ptp_get_vclocks_index);
+
+void ptp_convert_timestamp(struct skb_shared_hwtstamps *hwtstamps,
+                          int vclock_index)
+{
+       char name[PTP_CLOCK_NAME_LEN] = "";
+       struct ptp_vclock *vclock;
+       struct ptp_clock *ptp;
+       unsigned long flags;
+       struct device *dev;
+       u64 ns;
+
+       snprintf(name, PTP_CLOCK_NAME_LEN, "ptp%d", vclock_index);
+       dev = class_find_device_by_name(ptp_class, name);
+       if (!dev)
+               return;
+
+       ptp = dev_get_drvdata(dev);
+       if (!ptp->is_virtual_clock) {
+               put_device(dev);
+               return;
+       }
+
+       vclock = info_to_vclock(ptp->info);
+
+       ns = ktime_to_ns(hwtstamps->hwtstamp);
+
+       spin_lock_irqsave(&vclock->lock, flags);
+       ns = timecounter_cyc2time(&vclock->tc, ns);
+       spin_unlock_irqrestore(&vclock->lock, flags);
+
+       put_device(dev);
+       hwtstamps->hwtstamp = ns_to_ktime(ns);
+}
+EXPORT_SYMBOL(ptp_convert_timestamp);

diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h
index 300a984..71fac92 100644 (file)
--- a/include/linux/ptp_clock_kernel.h
+++ b/include/linux/ptp_clock_kernel.h
@@ -12,6 +12,7 @@
 #include <linux/pps_kernel.h>
 #include <linux/ptp_clock.h>
 #include <linux/timecounter.h>
+#include <linux/skbuff.h>
 
 #define PTP_CLOCK_NAME_LEN     32
 /**
@@ -318,6 +319,15 @@ void ptp_cancel_worker_sync(struct ptp_clock *ptp);
  */
 int ptp_get_vclocks_index(int pclock_index, int **vclock_index);
 
+/**
+ * ptp_convert_timestamp() - convert timestamp to a ptp vclock time
+ *
+ * @hwtstamps:    skb_shared_hwtstamps structure pointer
+ * @vclock_index: phc index of ptp vclock.
+ */
+void ptp_convert_timestamp(struct skb_shared_hwtstamps *hwtstamps,
+                          int vclock_index);
+
 #else
 static inline struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
                                                   struct device *parent)
@@ -339,6 +349,9 @@ static inline void ptp_cancel_worker_sync(struct ptp_clock *ptp)
 { }
 static inline int ptp_get_vclocks_index(int pclock_index, int **vclock_index)
 { return 0; }
+static inline void ptp_convert_timestamp(struct skb_shared_hwtstamps *hwtstamps,
+                                        int vclock_index)
+{ }
 
 #endif