LinuxPPS core (Version 2): the PPS Linux implementation. [LWN.net]

From:		Rodolfo Giometti <giometti@linux.it>
To:		linux-kernel@vger.kernel.org
Subject:		LinuxPPS core (Version 2): the PPS Linux implementation.
Date:		Tue, 10 Feb 2009 15:05:51 +0100
Message-ID:		<1234274752-29847-1-git-send-email-giometti@linux.it>
Cc:		Andrew Morton <akpm@linux-foundation.org>, David Woodhouse <dwmw2@infradead.org>, Dave Jones <davej@redhat.com>, Sam Ravnborg <sam@ravnborg.org>, Greg KH <greg@kroah.com>, Randy Dunlap <randy.dunlap@oracle.com>, Kay Sievers <kay.sievers@vrfy.org>, Alan Cox <alan@lxorguk.ukuu.org.uk>, "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@elte.hu>, Michael Kerrisk <mtk.manpages@gmail.com>, Christoph Hellwig <hch@infradead.org>
Archive-link:		Article, Thread

This patch adds the PPS core support into Linux.

Currently I just propose the "core" so after inclusion we can add all
other related stuff as suggested by several people in this list. :)

PPS means "pulse per second" and its API is specified by RFC 2783
(Pulse-Per-Second API for UNIX-like Operating Systems, Version 1.0).

The code has been tested with the NTPD program
(http://www.eecis.udel.edu/~mills/ntp/html/index.html) and several GPS
antennae.


Changelog
=========

Version 1 -> 2
--------------

* fix race during PPS source registration.

* PPS_CHECK removed.

* not needed check in pps_exit() removed.

* Printing stuff on exit removed.

Version [full patchset] -> 1
----------------------------

* stupid filenames removed.

* kernel-doc documentation of exported symbols.

* old BKL-locked ioctl removed.

* !uarg checks in the ioctls removed.

* pps.h revisited but not splitted, since several stuff are shared between
  kernel and user land (I hope this will not stop inclusion...)

Rodolfo


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