pps: default echo function

A default echo function has been provided so it is no longer an error when
you specify PPS_ECHOASSERT or PPS_ECHOCLEAR without an explicit echo
function.  This allows some code re-use and also makes it easier to write
client drivers since the default echo function does not normally need to
change.

Signed-off-by: James Nuss <jamesnuss@nanometrics.ca>
Reviewed-by: Ben Gardiner <bengardiner@nanometrics.ca>
Acked-by: Rodolfo Giometti <giometti@linux.it>
Cc: Ricardo Martins <rasm@fe.up.pt>
Cc: Alexander Gordeev <lasaine@lvk.cs.msu.su>
Cc: Igor Plyatov <plyatov@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/pps/clients/pps_parport.c

@@ -133,14 +133,6 @@ out_both:
 	return;
 }
 
-/* the PPS echo function */
-static void pps_echo(struct pps_device *pps, int event, void *data)
-{
-	dev_info(pps->dev, "echo %s %s\n",
-		event & PPS_CAPTUREASSERT ? "assert" : "",
-		event & PPS_CAPTURECLEAR ? "clear" : "");
-}
-
 static void parport_attach(struct parport *port)
 {
 	struct pps_client_pp *device;
@@ -151,7 +143,6 @@ static void parport_attach(struct parport *port)
 				  PPS_OFFSETASSERT | PPS_OFFSETCLEAR | \
 				  PPS_ECHOASSERT | PPS_ECHOCLEAR | \
 				  PPS_CANWAIT | PPS_TSFMT_TSPEC,
-		.echo		= pps_echo,
 		.owner		= THIS_MODULE,
 		.dev		= NULL
 	};