1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * pps-ktimer.c -- kernel timer test client
 4 *
 
 5 * Copyright (C) 2005-2006   Rodolfo Giometti <giometti@linux.it>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 6 */
 7
 8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/time.h>
14#include <linux/timer.h>
15#include <linux/pps_kernel.h>
16
17/*
18 * Global variables
19 */
20
21static struct pps_device *pps;
22static struct timer_list ktimer;
23
24/*
25 * The kernel timer
26 */
27
28static void pps_ktimer_event(struct timer_list *unused)
29{
30	struct pps_event_time ts;
31
32	/* First of all we get the time stamp... */
33	pps_get_ts(&ts);
34
35	pps_event(pps, &ts, PPS_CAPTUREASSERT, NULL);
36
37	mod_timer(&ktimer, jiffies + HZ);
38}
39
40/*
 
 
 
 
 
 
 
 
 
 
 
41 * The PPS info struct
42 */
43
44static struct pps_source_info pps_ktimer_info = {
45	.name		= "ktimer",
46	.path		= "",
47	.mode		= PPS_CAPTUREASSERT | PPS_OFFSETASSERT |
48			  PPS_ECHOASSERT |
49			  PPS_CANWAIT | PPS_TSFMT_TSPEC,
 
50	.owner		= THIS_MODULE,
51};
52
53/*
54 * Module staff
55 */
56
57static void __exit pps_ktimer_exit(void)
58{
59	dev_info(pps->dev, "ktimer PPS source unregistered\n");
60
61	del_timer_sync(&ktimer);
62	pps_unregister_source(pps);
63}
64
65static int __init pps_ktimer_init(void)
66{
67	pps = pps_register_source(&pps_ktimer_info,
68				PPS_CAPTUREASSERT | PPS_OFFSETASSERT);
69	if (IS_ERR(pps)) {
70		pr_err("cannot register PPS source\n");
71		return PTR_ERR(pps);
72	}
73
74	timer_setup(&ktimer, pps_ktimer_event, 0);
75	mod_timer(&ktimer, jiffies + HZ);
76
77	dev_info(pps->dev, "ktimer PPS source registered\n");
78
79	return 0;
80}
81
82module_init(pps_ktimer_init);
83module_exit(pps_ktimer_exit);
84
85MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
86MODULE_DESCRIPTION("dummy PPS source by using a kernel timer (just for debug)");
87MODULE_LICENSE("GPL");

 
  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
 35static struct pps_device *pps;
 36static struct timer_list ktimer;
 37
 38/*
 39 * The kernel timer
 40 */
 41
 42static void pps_ktimer_event(unsigned long ptr)
 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 echo function
 56 */
 57
 58static void pps_ktimer_echo(struct pps_device *pps, int event, void *data)
 59{
 60	dev_info(pps->dev, "echo %s %s\n",
 61		event & PPS_CAPTUREASSERT ? "assert" : "",
 62		event & PPS_CAPTURECLEAR ? "clear" : "");
 63}
 64
 65/*
 66 * The PPS info struct
 67 */
 68
 69static struct pps_source_info pps_ktimer_info = {
 70	.name		= "ktimer",
 71	.path		= "",
 72	.mode		= PPS_CAPTUREASSERT | PPS_OFFSETASSERT |
 73			  PPS_ECHOASSERT |
 74			  PPS_CANWAIT | PPS_TSFMT_TSPEC,
 75	.echo		= pps_ktimer_echo,
 76	.owner		= THIS_MODULE,
 77};
 78
 79/*
 80 * Module staff
 81 */
 82
 83static void __exit pps_ktimer_exit(void)
 84{
 85	dev_info(pps->dev, "ktimer PPS source unregistered\n");
 86
 87	del_timer_sync(&ktimer);
 88	pps_unregister_source(pps);
 89}
 90
 91static int __init pps_ktimer_init(void)
 92{
 93	pps = pps_register_source(&pps_ktimer_info,
 94				PPS_CAPTUREASSERT | PPS_OFFSETASSERT);
 95	if (pps == NULL) {
 96		pr_err("cannot register PPS source\n");
 97		return -ENOMEM;
 98	}
 99
100	setup_timer(&ktimer, pps_ktimer_event, 0);
101	mod_timer(&ktimer, jiffies + HZ);
102
103	dev_info(pps->dev, "ktimer PPS source registered\n");
104
105	return 0;
106}
107
108module_init(pps_ktimer_init);
109module_exit(pps_ktimer_exit);
110
111MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
112MODULE_DESCRIPTION("dummy PPS source by using a kernel timer (just for debug)");
113MODULE_LICENSE("GPL");