From eae9d2ba0cfc27a2ad9765f23efb98fb80d80234 Mon Sep 17 00:00:00 2001 From: Rodolfo Giometti Date: Wed, 17 Jun 2009 16:28:37 -0700 Subject: LinuxPPS: core support This patch adds the kernel side of the PPS support currently named "LinuxPPS". PPS means "pulse per second" and a PPS source is just a device which provides a high precision signal each second so that an application can use it to adjust system clock time. Common use is the combination of the NTPD as userland program with a GPS receiver as PPS source to obtain a wallclock-time with sub-millisecond synchronisation to UTC. To obtain this goal the userland programs shoud use the PPS API specification (RFC 2783 - Pulse-Per-Second API for UNIX-like Operating Systems, Version 1.0) which in part is implemented by this patch. It provides a set of chars devices, one per PPS source, which can be used to get the time signal. The RFC's functions can be implemented by accessing to these char devices. Signed-off-by: Rodolfo Giometti Cc: David Woodhouse Cc: Greg KH Cc: Randy Dunlap Cc: Kay Sievers Acked-by: Alan Cox Cc: Michael Kerrisk Cc: Christoph Hellwig Cc: Roman Zippel Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/pps/Makefile | 8 ++++++++ 1 file changed, 8 insertions(+) create mode 100644 drivers/pps/Makefile (limited to 'drivers/pps/Makefile') diff --git a/drivers/pps/Makefile b/drivers/pps/Makefile new file mode 100644 index 000000000000..19ea582f431d --- /dev/null +++ b/drivers/pps/Makefile @@ -0,0 +1,8 @@ +# +# Makefile for the PPS core. +# + +pps_core-y := pps.o kapi.o sysfs.o +obj-$(CONFIG_PPS) := pps_core.o + +ccflags-$(CONFIG_PPS_DEBUG) := -DDEBUG -- cgit v1.2.3