/* * PPS API kernel header * * Copyright (C) 2009 Rodolfo Giometti <giometti@linux.it> * * 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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * 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);