include/uapi/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 n_pins;    /* Number of input/output pins. */
  54         int rsv[14];   /* Reserved for future use. */
  55 };
  56
  57 struct ptp_extts_request {
  58         unsigned int index;  /* Which channel to configure. */
  59         unsigned int flags;  /* Bit field for PTP_xxx flags. */
  60         unsigned int rsv[2]; /* Reserved for future use. */
  61 };
  62
  63 struct ptp_perout_request {
  64         struct ptp_clock_time start;  /* Absolute start time. */
  65         struct ptp_clock_time period; /* Desired period, zero means disable. */
  66         unsigned int index;           /* Which channel to configure. */
  67         unsigned int flags;           /* Reserved for future use. */
  68         unsigned int rsv[4];          /* Reserved for future use. */
  69 };
  70
  71 #define PTP_MAX_SAMPLES 25 /* Maximum allowed offset measurement samples. */
  72
  73 struct ptp_sys_offset {
  74         unsigned int n_samples; /* Desired number of measurements. */
  75         unsigned int rsv[3];    /* Reserved for future use. */
  76         /*
  77          * Array of interleaved system/phc time stamps. The kernel
  78          * will provide 2*n_samples + 1 time stamps, with the last
  79          * one as a system time stamp.
  80          */
  81         struct ptp_clock_time ts[2 * PTP_MAX_SAMPLES + 1];
  82 };
  83
  84 enum ptp_pin_function {
  85         PTP_PF_NONE,
  86         PTP_PF_EXTTS,
  87         PTP_PF_PEROUT,
  88         PTP_PF_PHYSYNC,
  89 };
  90
  91 struct ptp_pin_desc {
  92         /*
  93          * Hardware specific human readable pin name. This field is
  94          * set by the kernel during the PTP_PIN_GETFUNC ioctl and is
  95          * ignored for the PTP_PIN_SETFUNC ioctl.
  96          */
  97         char name[64];
  98         /*
  99          * Pin index in the range of zero to ptp_clock_caps.n_pins - 1.
 100          */
 101         unsigned int index;
 102         /*
 103          * Which of the PTP_PF_xxx functions to use on this pin.
 104          */
 105         unsigned int func;
 106         /*
 107          * The specific channel to use for this function.
 108          * This corresponds to the 'index' field of the
 109          * PTP_EXTTS_REQUEST and PTP_PEROUT_REQUEST ioctls.
 110          */
 111         unsigned int chan;
 112         /*
 113          * Reserved for future use.
 114          */
 115         unsigned int rsv[5];
 116 };
 117
 118 #define PTP_CLK_MAGIC '='
 119
 120 #define PTP_CLOCK_GETCAPS  _IOR(PTP_CLK_MAGIC, 1, struct ptp_clock_caps)
 121 #define PTP_EXTTS_REQUEST  _IOW(PTP_CLK_MAGIC, 2, struct ptp_extts_request)
 122 #define PTP_PEROUT_REQUEST _IOW(PTP_CLK_MAGIC, 3, struct ptp_perout_request)
 123 #define PTP_ENABLE_PPS     _IOW(PTP_CLK_MAGIC, 4, int)
 124 #define PTP_SYS_OFFSET     _IOW(PTP_CLK_MAGIC, 5, struct ptp_sys_offset)
 125 #define PTP_PIN_GETFUNC    _IOWR(PTP_CLK_MAGIC, 6, struct ptp_pin_desc)
 126 #define PTP_PIN_SETFUNC    _IOW(PTP_CLK_MAGIC, 7, struct ptp_pin_desc)
 127
 128 struct ptp_extts_event {
 129         struct ptp_clock_time t; /* Time event occured. */
 130         unsigned int index;      /* Which channel produced the event. */
 131         unsigned int flags;      /* Reserved for future use. */
 132         unsigned int rsv[2];     /* Reserved for future use. */
 133 };
 134
 135 #endif