20 Aug, 2013

1 commit

• bd0eae4e1   PPS: convert class code to use dev_groups ... Browse Code »

  The dev_attrs field of struct class is going away soon, dev_groups
  should be used instead. This converts the pps class code to use the
  correct field.

  Cc: Rodolfo Giometti
  Signed-off-by: Greg Kroah-Hartman

  Greg Kroah-Hartman

  2013-08-20 12:22:34 +0800  

19 Jun, 2009

1 commit

• eae9d2ba0   LinuxPPS: core support ... Browse Code »

  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

  Rodolfo Giometti

  2009-06-19 04:04:04 +0800