Doug / smarc-fsl-linux-kernel

12 Nov, 2009

2 commits

  • 276b282e9   pps: events reporting fix up ... Browse Code »

    PPS events must be recorded according to PPS's mode settings.

    If a process asks for (i.e.) capture-assert events only, when the PPS
    client calls the pps_event() function to save the current PPS event, we
    should verify the event type and then discard unwanted ones.

    Also, without this patch userland processes waiting for a specific PPS
    event (assert or clear but not both) may be awakened at wrong time.

    Signed-off-by: Rodolfo Giometti
    Tested-by: William S. Brasher
    Tested-by: Reg Clemens
    Cc:
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Rodolfo Giometti
     
  • cbf83cc5a   pps: locking scheme fix up for PPS_GETPARAMS ... Browse Code »

    Userland programs may read/write PPS parameters at same time and these
    operations may corrupt PPS data.

    Signed-off-by: Rodolfo Giometti
    Tested-by: Reg Clemens
    Cc:
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Rodolfo Giometti
     

27 Aug, 2009

1 commit

  • 054b2b13c   pps: fix incorrect verdict check ... Browse Code »

    Fix incorrect verdict check and returns error if device_create failed,
    otherwise driver triggers kernel oops.

    Signed-off-by: Joonwoo Park
    Cc: Rodolfo Giometti
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Joonwoo Park
     

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