1 /* 2 * PPS API kernel header 3 * 4 * Copyright (C) 2009 Rodolfo Giometti <[email protected]> 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 #include <linux/pps.h> 22 23 #include <linux/cdev.h> 24 #include <linux/device.h> 25 #include <linux/time.h> 26 27 /* 28 * Global defines 29 */ 30 31 /* The specific PPS source info */ 32 struct pps_source_info { 33 char name[PPS_MAX_NAME_LEN]; /* simbolic name */ 34 char path[PPS_MAX_NAME_LEN]; /* path of connected device */ 35 int mode; /* PPS's allowed mode */ 36 37 void (*echo)(int source, int event, void *data); /* PPS echo function */ 38 39 struct module *owner; 40 struct device *dev; 41 }; 42 43 /* The main struct */ 44 struct pps_device { 45 struct pps_source_info info; /* PSS source info */ 46 47 struct pps_kparams params; /* PPS's current params */ 48 49 __u32 assert_sequence; /* PPS' assert event seq # */ 50 __u32 clear_sequence; /* PPS' clear event seq # */ 51 struct pps_ktime assert_tu; 52 struct pps_ktime clear_tu; 53 int current_mode; /* PPS mode at event time */ 54 55 int go; /* PPS event is arrived? */ 56 wait_queue_head_t queue; /* PPS event queue */ 57 58 unsigned int id; /* PPS source unique ID */ 59 struct cdev cdev; 60 struct device *dev; 61 int devno; 62 struct fasync_struct *async_queue; /* fasync method */ 63 spinlock_t lock; 64 65 atomic_t usage; /* usage count */ 66 }; 67 68 /* 69 * Global variables 70 */ 71 72 extern spinlock_t pps_idr_lock; 73 extern struct idr pps_idr; 74 extern struct timespec pps_irq_ts[]; 75 76 extern struct device_attribute pps_attrs[]; 77 78 /* 79 * Exported functions 80 */ 81 82 struct pps_device *pps_get_source(int source); 83 extern void pps_put_source(struct pps_device *pps); 84 extern int pps_register_source(struct pps_source_info *info, 85 int default_params); 86 extern void pps_unregister_source(int source); 87 extern int pps_register_cdev(struct pps_device *pps); 88 extern void pps_unregister_cdev(struct pps_device *pps); 89 extern void pps_event(int source, struct pps_ktime *ts, int event, void *data); 90