Autoconfiguration kluge for Raspberry Pi.

When a serial device to be opened is /dev/ttyAMA0, and /dev/pps0 exists,
and we have read-write access to it (which implies running as root),
substitute /dev/pps0 for the device name in the thread context so we
use KPPS.

Should be safe because /dev/ttyAMA0 is so specific to the Raspberry Pi.

1 files changed, 8 insertions, 0 deletions

diff --git a/timehint.c b/timehint.c
index 84c68506..06c2e646 100644
--- a/timehint.c
+++ b/timehint.c
@@ -442,6 +442,14 @@ void ntpshm_link_activate(struct gps_device_t *session)
 	} else {
 	    init_hook(session);
 	    session->pps_thread.report_hook = report_hook;
+	    /*
+	     * The Raspberry Pi kludge. If we're using /dev/ttyAMA0, 
+	     * and there is a static /dev/pps0, and we have access because
+	     * we're root, assume we want to use KPPS. 
+	     */
+	    if (strcmp(session->pps_thread.devicename, "/dev/ttyAMA0") == 0
+	    		&& access("/dev/pps0", R_OK | W_OK) == 0)
+		session->pps_thread.devicename = "/dev/pps0";
 	    pps_thread_activate(&session->pps_thread);
 	}
     }