pps: unify timestamp gathering

Add a helper function to gather timestamps.  This way clients don't have
to duplicate it.

Signed-off-by: Alexander Gordeev <lasaine@lvk.cs.msu.su>
Acked-by: Rodolfo Giometti <giometti@linux.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/pps/clients/pps-ktimer.c

@@ -40,18 +40,13 @@ static struct timer_list ktimer;
 
 static void pps_ktimer_event(unsigned long ptr)
 {
-	struct timespec __ts;
-	struct pps_ktime ts;
+	struct pps_event_time ts;
 
 	/* First of all we get the time stamp... */
-	getnstimeofday(&__ts);
+	pps_get_ts(&ts);
 
 	pr_info("PPS event at %lu\n", jiffies);
 
-	/* ... and translate it to PPS time data struct */
-	ts.sec = __ts.tv_sec;
-	ts.nsec = __ts.tv_nsec;
-
 	pps_event(source, &ts, PPS_CAPTUREASSERT, NULL);
 
 	mod_timer(&ktimer, jiffies + HZ);

drivers/pps/clients/pps-ldisc.c

@@ -27,26 +27,20 @@
 #define PPS_TTY_MAGIC		0x0001
 
 static void pps_tty_dcd_change(struct tty_struct *tty, unsigned int status,
-				struct timespec *ts)
+				struct pps_event_time *ts)
 {
 	int id = (long)tty->disc_data;
-	struct timespec __ts;
-	struct pps_ktime pps_ts;
+	struct pps_event_time __ts;
 
 	/* First of all we get the time stamp... */
-	getnstimeofday(&__ts);
+	pps_get_ts(&__ts);
 
 	/* Does caller give us a timestamp? */
-	if (ts) {	/* Yes. Let's use it! */
-		pps_ts.sec = ts->tv_sec;
-		pps_ts.nsec = ts->tv_nsec;
-	} else {	/* No. Do it ourself! */
-		pps_ts.sec = __ts.tv_sec;
-		pps_ts.nsec = __ts.tv_nsec;
-	}
+	if (!ts)	/* No. Do it ourself! */
+		ts = &__ts;
 
 	/* Now do the PPS event report */
-	pps_event(id, &pps_ts, status ? PPS_CAPTUREASSERT : PPS_CAPTURECLEAR,
+	pps_event(id, ts, status ? PPS_CAPTUREASSERT : PPS_CAPTURECLEAR,
 			NULL);
 
 	pr_debug("PPS %s at %lu on source #%d\n",

drivers/pps/kapi.c

@@ -268,11 +268,12 @@ EXPORT_SYMBOL(pps_unregister_source);
  *	pps->info.echo(source, event, data);
  */
 
-void pps_event(int source, struct pps_ktime *ts, int event, void *data)
+void pps_event(int source, struct pps_event_time *ts, int event, void *data)
 {
 	struct pps_device *pps;
 	unsigned long flags;
 	int captured = 0;
+	struct pps_ktime ts_real;
 
 	if ((event & (PPS_CAPTUREASSERT | PPS_CAPTURECLEAR)) == 0) {
 		printk(KERN_ERR "pps: unknown event (%x) for source %d\n",
@@ -284,8 +285,10 @@ void pps_event(int source, struct pps_ktime *ts, int event, void *data)
 	if (!pps)
 		return;
 
-	pr_debug("PPS event on source %d at %llu.%06u\n",
-			pps->id, (unsigned long long) ts->sec, ts->nsec);
+	pr_debug("PPS event on source %d at %ld.%09ld\n",
+			pps->id, ts->ts_real.tv_sec, ts->ts_real.tv_nsec);
+
+	timespec_to_pps_ktime(&ts_real, ts->ts_real);
 
 	spin_lock_irqsave(&pps->lock, flags);
 
@@ -299,10 +302,11 @@ void pps_event(int source, struct pps_ktime *ts, int event, void *data)
 			(pps->params.mode & PPS_CAPTUREASSERT)) {
 		/* We have to add an offset? */
 		if (pps->params.mode & PPS_OFFSETASSERT)
-			pps_add_offset(ts, &pps->params.assert_off_tu);
+			pps_add_offset(&ts_real,
+					&pps->params.assert_off_tu);
 
 		/* Save the time stamp */
-		pps->assert_tu = *ts;
+		pps->assert_tu = ts_real;
 		pps->assert_sequence++;
 		pr_debug("capture assert seq #%u for source %d\n",
 			pps->assert_sequence, source);
@@ -313,10 +317,11 @@ void pps_event(int source, struct pps_ktime *ts, int event, void *data)
 			(pps->params.mode & PPS_CAPTURECLEAR)) {
 		/* We have to add an offset? */
 		if (pps->params.mode & PPS_OFFSETCLEAR)
-			pps_add_offset(ts, &pps->params.clear_off_tu);
+			pps_add_offset(&ts_real,
+					&pps->params.clear_off_tu);
 
 		/* Save the time stamp */
-		pps->clear_tu = *ts;
+		pps->clear_tu = ts_real;
 		pps->clear_sequence++;
 		pr_debug("capture clear seq #%u for source %d\n",
 			pps->clear_sequence, source);

include/linux/pps_kernel.h

@@ -43,6 +43,10 @@ struct pps_source_info {
 	struct device *dev;
 };
 
+struct pps_event_time {
+	struct timespec ts_real;
+};
+
 /* The main struct */
 struct pps_device {
 	struct pps_source_info info;		/* PSS source info */
@@ -88,6 +92,20 @@ extern int pps_register_source(struct pps_source_info *info,
 extern void pps_unregister_source(int source);
 extern int pps_register_cdev(struct pps_device *pps);
 extern void pps_unregister_cdev(struct pps_device *pps);
-extern void pps_event(int source, struct pps_ktime *ts, int event, void *data);
+extern void pps_event(int source, struct pps_event_time *ts, int event,
+		void *data);
+
+static inline void timespec_to_pps_ktime(struct pps_ktime *kt,
+		struct timespec ts)
+{
+	kt->sec = ts.tv_sec;
+	kt->nsec = ts.tv_nsec;
+}
+
+static inline void pps_get_ts(struct pps_event_time *ts)
+{
+	getnstimeofday(&ts->ts_real);
+}
 
 #endif /* LINUX_PPS_KERNEL_H */
+

include/linux/serial_core.h

@@ -212,6 +212,7 @@
 #include <linux/tty.h>
 #include <linux/mutex.h>
 #include <linux/sysrq.h>
+#include <linux/pps_kernel.h>
 
 struct uart_port;
 struct serial_struct;
@@ -528,10 +529,10 @@ uart_handle_dcd_change(struct uart_port *uport, unsigned int status)
 	struct uart_state *state = uport->state;
 	struct tty_port *port = &state->port;
 	struct tty_ldisc *ld = tty_ldisc_ref(port->tty);
-	struct timespec ts;
+	struct pps_event_time ts;
 
 	if (ld && ld->ops->dcd_change)
-		getnstimeofday(&ts);
+		pps_get_ts(&ts);
 
 	uport->icount.dcd++;
 #ifdef CONFIG_HARD_PPS

include/linux/tty_ldisc.h

@@ -101,7 +101,7 @@
  *	any pending driver I/O is completed.
  *
  * void (*dcd_change)(struct tty_struct *tty, unsigned int status,
- * 			struct timespec *ts)
+ *			struct pps_event_time *ts)
  *
  *	Tells the discipline that the DCD pin has changed its status and
  *	the relative timestamp. Pointer ts can be NULL.
@@ -109,6 +109,7 @@
 
 #include <linux/fs.h>
 #include <linux/wait.h>
+#include <linux/pps_kernel.h>
 
 struct tty_ldisc_ops {
 	int	magic;
@@ -143,7 +144,7 @@ struct tty_ldisc_ops {
 			       char *fp, int count);
 	void	(*write_wakeup)(struct tty_struct *);
 	void	(*dcd_change)(struct tty_struct *, unsigned int,
-				struct timespec *);
+				struct pps_event_time *);
 
 	struct  module *owner;