pps: add kernel consumer support

Add an optional feature of PPSAPI, kernel consumer support, which uses the
added hardpps() function.

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/kapi.c

@@ -26,11 +26,14 @@
 #include <linux/init.h>
 #include <linux/sched.h>
 #include <linux/time.h>
+#include <linux/timex.h>
 #include <linux/spinlock.h>
 #include <linux/fs.h>
 #include <linux/pps_kernel.h>
 #include <linux/slab.h>
 
+#include "kc.h"
+
 /*
  * Local functions
  */
@@ -139,6 +142,7 @@ EXPORT_SYMBOL(pps_register_source);
 
 void pps_unregister_source(struct pps_device *pps)
 {
+	pps_kc_remove(pps);
 	pps_unregister_cdev(pps);
 
 	/* don't have to kfree(pps) here because it will be done on
@@ -211,6 +215,8 @@ void pps_event(struct pps_device *pps, struct pps_event_time *ts, int event,
 		captured = ~0;
 	}
 
+	pps_kc_event(pps, ts, event);
+
 	/* Wake up if captured something */
 	if (captured) {
 		pps->last_ev++;