linux/include/linux/pps_kernel.h
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   1/*
   2 * PPS API kernel header
   3 *
   4 * Copyright (C) 2009   Rodolfo Giometti <giometti@linux.it>
   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 LINUX_PPS_KERNEL_H
  22#define LINUX_PPS_KERNEL_H
  23
  24#include <linux/pps.h>
  25
  26#include <linux/cdev.h>
  27#include <linux/device.h>
  28#include <linux/time.h>
  29
  30/*
  31 * Global defines
  32 */
  33
  34struct pps_device;
  35
  36/* The specific PPS source info */
  37struct pps_source_info {
  38        char name[PPS_MAX_NAME_LEN];            /* simbolic name */
  39        char path[PPS_MAX_NAME_LEN];            /* path of connected device */
  40        int mode;                               /* PPS's allowed mode */
  41
  42        void (*echo)(struct pps_device *pps,
  43                        int event, void *data); /* PPS echo function */
  44
  45        struct module *owner;
  46        struct device *dev;
  47};
  48
  49struct pps_event_time {
  50#ifdef CONFIG_NTP_PPS
  51        struct timespec ts_raw;
  52#endif /* CONFIG_NTP_PPS */
  53        struct timespec ts_real;
  54};
  55
  56/* The main struct */
  57struct pps_device {
  58        struct pps_source_info info;            /* PSS source info */
  59
  60        struct pps_kparams params;              /* PPS's current params */
  61
  62        __u32 assert_sequence;                  /* PPS' assert event seq # */
  63        __u32 clear_sequence;                   /* PPS' clear event seq # */
  64        struct pps_ktime assert_tu;
  65        struct pps_ktime clear_tu;
  66        int current_mode;                       /* PPS mode at event time */
  67
  68        unsigned int last_ev;                   /* last PPS event id */
  69        wait_queue_head_t queue;                /* PPS event queue */
  70
  71        unsigned int id;                        /* PPS source unique ID */
  72        struct cdev cdev;
  73        struct device *dev;
  74        struct fasync_struct *async_queue;      /* fasync method */
  75        spinlock_t lock;
  76};
  77
  78/*
  79 * Global variables
  80 */
  81
  82extern struct device_attribute pps_attrs[];
  83
  84/*
  85 * Exported functions
  86 */
  87
  88extern struct pps_device *pps_register_source(
  89                struct pps_source_info *info, int default_params);
  90extern void pps_unregister_source(struct pps_device *pps);
  91extern int pps_register_cdev(struct pps_device *pps);
  92extern void pps_unregister_cdev(struct pps_device *pps);
  93extern void pps_event(struct pps_device *pps,
  94                struct pps_event_time *ts, int event, void *data);
  95
  96static inline void timespec_to_pps_ktime(struct pps_ktime *kt,
  97                struct timespec ts)
  98{
  99        kt->sec = ts.tv_sec;
 100        kt->nsec = ts.tv_nsec;
 101}
 102
 103#ifdef CONFIG_NTP_PPS
 104
 105static inline void pps_get_ts(struct pps_event_time *ts)
 106{
 107        getnstime_raw_and_real(&ts->ts_raw, &ts->ts_real);
 108}
 109
 110#else /* CONFIG_NTP_PPS */
 111
 112static inline void pps_get_ts(struct pps_event_time *ts)
 113{
 114        getnstimeofday(&ts->ts_real);
 115}
 116
 117#endif /* CONFIG_NTP_PPS */
 118
 119/* Subtract known time delay from PPS event time(s) */
 120static inline void pps_sub_ts(struct pps_event_time *ts, struct timespec delta)
 121{
 122        ts->ts_real = timespec_sub(ts->ts_real, delta);
 123#ifdef CONFIG_NTP_PPS
 124        ts->ts_raw = timespec_sub(ts->ts_raw, delta);
 125#endif
 126}
 127
 128#endif /* LINUX_PPS_KERNEL_H */
 129
 130
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