include/linux/ptp_clock.h

   1 /*
   2  * PTP 1588 clock support - user space interface
   3  *
   4  * Copyright (C) 2010 OMICRON electronics GmbH
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #ifndef _PTP_CLOCK_H_
  22 #define _PTP_CLOCK_H_
  23
  24 #include <linux/ioctl.h>
  25 #include <linux/types.h>
  26
  27 /* PTP_xxx bits, for the flags field within the request structures. */
  28 #define PTP_ENABLE_FEATURE (1<<0)
  29 #define PTP_RISING_EDGE    (1<<1)
  30 #define PTP_FALLING_EDGE   (1<<2)
  31
  32 /*
  33  * struct ptp_clock_time - represents a time value
  34  *
  35  * The sign of the seconds field applies to the whole value. The
  36  * nanoseconds field is always unsigned. The reserved field is
  37  * included for sub-nanosecond resolution, should the demand for
  38  * this ever appear.
  39  *
  40  */
  41 struct ptp_clock_time {
  42         __s64 sec;  /* seconds */
  43         __u32 nsec; /* nanoseconds */
  44         __u32 reserved;
  45 };
  46
  47 struct ptp_clock_caps {
  48         int max_adj;   /* Maximum frequency adjustment in parts per billon. */
  49         int n_alarm;   /* Number of programmable alarms. */
  50         int n_ext_ts;  /* Number of external time stamp channels. */
  51         int n_per_out; /* Number of programmable periodic signals. */
  52         int pps;       /* Whether the clock supports a PPS callback. */
  53         int rsv[15];   /* Reserved for future use. */
  54 };
  55
  56 struct ptp_extts_request {
  57         unsigned int index;  /* Which channel to configure. */
  58         unsigned int flags;  /* Bit field for PTP_xxx flags. */
  59         unsigned int rsv[2]; /* Reserved for future use. */
  60 };
  61
  62 struct ptp_perout_request {
  63         struct ptp_clock_time start;  /* Absolute start time. */
  64         struct ptp_clock_time period; /* Desired period, zero means disable. */
  65         unsigned int index;           /* Which channel to configure. */
  66         unsigned int flags;           /* Reserved for future use. */
  67         unsigned int rsv[4];          /* Reserved for future use. */
  68 };
  69
  70 #define PTP_CLK_MAGIC '='
  71
  72 #define PTP_CLOCK_GETCAPS  _IOR(PTP_CLK_MAGIC, 1, struct ptp_clock_caps)
  73 #define PTP_EXTTS_REQUEST  _IOW(PTP_CLK_MAGIC, 2, struct ptp_extts_request)
  74 #define PTP_PEROUT_REQUEST _IOW(PTP_CLK_MAGIC, 3, struct ptp_perout_request)
  75 #define PTP_ENABLE_PPS     _IOW(PTP_CLK_MAGIC, 4, int)
  76
  77 struct ptp_extts_event {
  78         struct ptp_clock_time t; /* Time event occured. */
  79         unsigned int index;      /* Which channel produced the event. */
  80         unsigned int flags;      /* Reserved for future use. */
  81         unsigned int rsv[2];     /* Reserved for future use. */
  82 };
  83
  84 #endif