linux/include/linux/ptp_clock.h
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   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 */
  41struct ptp_clock_time {
  42        __s64 sec;  /* seconds */
  43        __u32 nsec; /* nanoseconds */
  44        __u32 reserved;
  45};
  46
  47struct 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
  56struct 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
  62struct 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
  77struct 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
  85
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