2 * pps-ktimer.c -- kernel timer test client
5 * Copyright (C) 2005-2006 Rodolfo Giometti <giometti@linux.it>
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.
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.
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.
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
35 static struct pps_device *pps;
36 static struct timer_list ktimer;
42 static void pps_ktimer_event(unsigned long ptr)
44 struct pps_event_time ts;
46 /* First of all we get the time stamp... */
49 dev_info(pps->dev, "PPS event at %lu\n", jiffies);
51 pps_event(pps, &ts, PPS_CAPTUREASSERT, NULL);
53 mod_timer(&ktimer, jiffies + HZ);
60 static void pps_ktimer_echo(struct pps_device *pps, int event, void *data)
62 dev_info(pps->dev, "echo %s %s\n",
63 event & PPS_CAPTUREASSERT ? "assert" : "",
64 event & PPS_CAPTURECLEAR ? "clear" : "");
71 static struct pps_source_info pps_ktimer_info = {
74 .mode = PPS_CAPTUREASSERT | PPS_OFFSETASSERT |
76 PPS_CANWAIT | PPS_TSFMT_TSPEC,
77 .echo = pps_ktimer_echo,
85 static void __exit pps_ktimer_exit(void)
87 dev_info(pps->dev, "ktimer PPS source unregistered\n");
89 del_timer_sync(&ktimer);
90 pps_unregister_source(pps);
93 static int __init pps_ktimer_init(void)
95 pps = pps_register_source(&pps_ktimer_info,
96 PPS_CAPTUREASSERT | PPS_OFFSETASSERT);
98 pr_err("cannot register PPS source\n");
102 setup_timer(&ktimer, pps_ktimer_event, 0);
103 mod_timer(&ktimer, jiffies + HZ);
105 dev_info(pps->dev, "ktimer PPS source registered\n");
110 module_init(pps_ktimer_init);
111 module_exit(pps_ktimer_exit);
113 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
114 MODULE_DESCRIPTION("dummy PPS source by using a kernel timer (just for debug)");
115 MODULE_LICENSE("GPL");