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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 23 24 #include <linux/kernel.h> 25 #include <linux/module.h> 26 #include <linux/init.h> 27 #include <linux/time.h> 28 #include <linux/timer.h> 29 #include <linux/pps_kernel.h> 30 31 /* 32 * Global variables 33 */ 34 35 static struct pps_device *pps; 36 static struct timer_list ktimer; 37 38 /* 39 * The kernel timer 40 */ 41 42 static void pps_ktimer_event(struct timer_list *unused) 43 { 44 struct pps_event_time ts; 45 46 /* First of all we get the time stamp... */ 47 pps_get_ts(&ts); 48 49 pps_event(pps, &ts, PPS_CAPTUREASSERT, NULL); 50 51 mod_timer(&ktimer, jiffies + HZ); 52 } 53 54 /* 55 * The PPS info struct 56 */ 57 58 static struct pps_source_info pps_ktimer_info = { 59 .name = "ktimer", 60 .path = "", 61 .mode = PPS_CAPTUREASSERT | PPS_OFFSETASSERT | 62 PPS_ECHOASSERT | 63 PPS_CANWAIT | PPS_TSFMT_TSPEC, 64 .owner = THIS_MODULE, 65 }; 66 67 /* 68 * Module staff 69 */ 70 71 static void __exit pps_ktimer_exit(void) 72 { 73 dev_info(pps->dev, "ktimer PPS source unregistered\n"); 74 75 del_timer_sync(&ktimer); 76 pps_unregister_source(pps); 77 } 78 79 static int __init pps_ktimer_init(void) 80 { 81 pps = pps_register_source(&pps_ktimer_info, 82 PPS_CAPTUREASSERT | PPS_OFFSETASSERT); 83 if (pps == NULL) { 84 pr_err("cannot register PPS source\n"); 85 return -ENOMEM; 86 } 87 88 timer_setup(&ktimer, pps_ktimer_event, 0); 89 mod_timer(&ktimer, jiffies + HZ); 90 91 dev_info(pps->dev, "ktimer PPS source registered\n"); 92 93 return 0; 94 } 95 96 module_init(pps_ktimer_init); 97 module_exit(pps_ktimer_exit); 98 99 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); 100 MODULE_DESCRIPTION("dummy PPS source by using a kernel timer (just for debug)"); 101 MODULE_LICENSE("GPL"); 102