1/* 2 * pps-ktimer.c -- kernel timer test client 3 * 4 * 5 * Copyright (C) 2005-2006 Rodolfo Giometti <giometti@linux.it> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22 23#include <linux/kernel.h> 24#include <linux/module.h> 25#include <linux/init.h> 26#include <linux/time.h> 27#include <linux/timer.h> 28#include <linux/pps_kernel.h> 29 30/* 31 * Global variables 32 */ 33 34static int source; 35static struct timer_list ktimer; 36 37/* 38 * The kernel timer 39 */ 40 41static void pps_ktimer_event(unsigned long ptr) 42{ 43 struct timespec __ts; 44 struct pps_ktime ts; 45 46 /* First of all we get the time stamp... */ 47 getnstimeofday(&__ts); 48 49 pr_info("PPS event at %lu\n", jiffies); 50 51 /* ... and translate it to PPS time data struct */ 52 ts.sec = __ts.tv_sec; 53 ts.nsec = __ts.tv_nsec; 54 55 pps_event(source, &ts, PPS_CAPTUREASSERT, NULL); 56 57 mod_timer(&ktimer, jiffies + HZ); 58} 59 60/* 61 * The echo function 62 */ 63 64static void pps_ktimer_echo(int source, int event, void *data) 65{ 66 pr_info("echo %s %s for source %d\n", 67 event & PPS_CAPTUREASSERT ? "assert" : "", 68 event & PPS_CAPTURECLEAR ? "clear" : "", 69 source); 70} 71 72/* 73 * The PPS info struct 74 */ 75 76static struct pps_source_info pps_ktimer_info = { 77 .name = "ktimer", 78 .path = "", 79 .mode = PPS_CAPTUREASSERT | PPS_OFFSETASSERT | 80 PPS_ECHOASSERT | 81 PPS_CANWAIT | PPS_TSFMT_TSPEC, 82 .echo = pps_ktimer_echo, 83 .owner = THIS_MODULE, 84}; 85 86/* 87 * Module staff 88 */ 89 90static void __exit pps_ktimer_exit(void) 91{ 92 del_timer_sync(&ktimer); 93 pps_unregister_source(source); 94 95 pr_info("ktimer PPS source unregistered\n"); 96} 97 98static int __init pps_ktimer_init(void) 99{ 100 int ret; 101 102 ret = pps_register_source(&pps_ktimer_info, 103 PPS_CAPTUREASSERT | PPS_OFFSETASSERT); 104 if (ret < 0) { 105 printk(KERN_ERR "cannot register ktimer source\n"); 106 return ret; 107 } 108 source = ret; 109 110 setup_timer(&ktimer, pps_ktimer_event, 0); 111 mod_timer(&ktimer, jiffies + HZ); 112 113 pr_info("ktimer PPS source registered at %d\n", source); 114 115 return 0; 116} 117 118module_init(pps_ktimer_init); 119module_exit(pps_ktimer_exit); 120 121MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); 122MODULE_DESCRIPTION("dummy PPS source by using a kernel timer (just for debug)"); 123MODULE_LICENSE("GPL"); 124