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* PPS API kernel header
* Copyright (C) 2009 Rodolfo Giometti <>
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#include <linux/pps.h>
#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/time.h>
* Global defines
/* The specific PPS source info */
struct pps_source_info {
char name[PPS_MAX_NAME_LEN]; /* simbolic name */
char path[PPS_MAX_NAME_LEN]; /* path of connected device */
int mode; /* PPS's allowed mode */
void (*echo)(int source, int event, void *data); /* PPS echo function */
struct module *owner;
struct device *dev;
/* The main struct */
struct pps_device {
struct pps_source_info info; /* PSS source info */
struct pps_kparams params; /* PPS's current params */
__u32 assert_sequence; /* PPS' assert event seq # */
__u32 clear_sequence; /* PPS' clear event seq # */
struct pps_ktime assert_tu;
struct pps_ktime clear_tu;
int current_mode; /* PPS mode at event time */
int go; /* PPS event is arrived? */
wait_queue_head_t queue; /* PPS event queue */
unsigned int id; /* PPS source unique ID */
struct cdev cdev;
struct device *dev;
int devno;
struct fasync_struct *async_queue; /* fasync method */
spinlock_t lock;
atomic_t usage; /* usage count */
* Global variables
extern spinlock_t pps_idr_lock;
extern struct idr pps_idr;
extern struct timespec pps_irq_ts[];
extern struct device_attribute pps_attrs[];
* Exported functions
struct pps_device *pps_get_source(int source);
extern void pps_put_source(struct pps_device *pps);
extern int pps_register_source(struct pps_source_info *info,
int default_params);
extern void pps_unregister_source(int source);
extern int pps_register_cdev(struct pps_device *pps);
extern void pps_unregister_cdev(struct pps_device *pps);
extern void pps_event(int source, struct pps_ktime *ts, int event, void *data);