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authorRodolfo Giometti <giometti@linux.it>2009-06-17 16:28:37 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-18 13:04:04 -0700
commiteae9d2ba0cfc27a2ad9765f23efb98fb80d80234 (patch)
treef4be40ca528b2f23f97fa9cb6ebe91b8d6696d5b /include/linux/Kbuild
parent8820f27ad9a5ad2a62cdcdf425d7921c31831800 (diff)
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 <giometti@linux.it> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Greg KH <greg@kroah.com> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: Kay Sievers <kay.sievers@vrfy.org> Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Michael Kerrisk <mtk.manpages@googlemail.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/Kbuild')
-rw-r--r--include/linux/Kbuild1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index a2df7030d49d..03f22076381f 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -308,6 +308,7 @@ unifdef-y += pmu.h
unifdef-y += poll.h
unifdef-y += ppp_defs.h
unifdef-y += ppp-comp.h
+unifdef-y += pps.h
unifdef-y += ptrace.h
unifdef-y += quota.h
unifdef-y += random.h