include/linux/pps_kernel.h

   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 #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);