[thirdparty/linux.git] / drivers / pps / clients / pps-ktimer.c

/*
 * pps-ktimer.c -- kernel timer test client
 *
 *
 * Copyright (C) 2005-2006   Rodolfo Giometti <giometti@linux.it>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <linux/pps_kernel.h>

/*
 * Global variables
 */

static struct pps_device *pps;
static struct timer_list ktimer;

/*
 * The kernel timer
 */

static void pps_ktimer_event(struct timer_list *unused)
{
	struct pps_event_time ts;

	/* First of all we get the time stamp... */
	pps_get_ts(&ts);

	pps_event(pps, &ts, PPS_CAPTUREASSERT, NULL);

	mod_timer(&ktimer, jiffies + HZ);
}

/*
 * The PPS info struct
 */

static struct pps_source_info pps_ktimer_info = {
	.name		= "ktimer",
	.path		= "",
	.mode		= PPS_CAPTUREASSERT | PPS_OFFSETASSERT |
			  PPS_ECHOASSERT |
			  PPS_CANWAIT | PPS_TSFMT_TSPEC,
	.owner		= THIS_MODULE,
};

/*
 * Module staff
 */

static void __exit pps_ktimer_exit(void)
{
	dev_info(pps->dev, "ktimer PPS source unregistered\n");

	del_timer_sync(&ktimer);
	pps_unregister_source(pps);
}

static int __init pps_ktimer_init(void)
{
	pps = pps_register_source(&pps_ktimer_info,
				PPS_CAPTUREASSERT | PPS_OFFSETASSERT);
	if (pps == NULL) {
		pr_err("cannot register PPS source\n");
		return -ENOMEM;
	}

	timer_setup(&ktimer, pps_ktimer_event, 0);
	mod_timer(&ktimer, jiffies + HZ);

	dev_info(pps->dev, "ktimer PPS source registered\n");

	return 0;
}

module_init(pps_ktimer_init);
module_exit(pps_ktimer_exit);

MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
MODULE_DESCRIPTION("dummy PPS source by using a kernel timer (just for debug)");
MODULE_LICENSE("GPL");
Commit	Line	Data
697fb85f RG	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
7f7cce74	22	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
697fb85f RG	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
5e196d34	35	static struct pps_device *pps;
697fb85f RG	36	static struct timer_list ktimer;
	37
	38	/*
	39	* The kernel timer
	40	*/
	41
e99e88a9	42	static void pps_ktimer_event(struct timer_list *unused)
697fb85f	43	{
6f4229b5	44	struct pps_event_time ts;
697fb85f RG	45
697fb85f RG	46	/* First of all we get the time stamp... */
6f4229b5	47	pps_get_ts(&ts);
697fb85f	48
5e196d34	49	pps_event(pps, &ts, PPS_CAPTUREASSERT, NULL);
697fb85f RG	50
	51	mod_timer(&ktimer, jiffies + HZ);
	52	}
	53
697fb85f RG	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,
697fb85f RG	64	.owner = THIS_MODULE,
	65	};
	66
	67	/*
	68	* Module staff
	69	*/
	70
	71	static void __exit pps_ktimer_exit(void)
	72	{
5e196d34	73	dev_info(pps->dev, "ktimer PPS source unregistered\n");
697fb85f	74
5e196d34 AG	75	del_timer_sync(&ktimer);
5e196d34 AG	76	pps_unregister_source(pps);
697fb85f RG	77	}
	78
	79	static int __init pps_ktimer_init(void)
	80	{
5e196d34	81	pps = pps_register_source(&pps_ktimer_info,
697fb85f	82	PPS_CAPTUREASSERT \| PPS_OFFSETASSERT);
5e196d34	83	if (pps == NULL) {
7f7cce74	84	pr_err("cannot register PPS source\n");
5e196d34	85	return -ENOMEM;
697fb85f	86	}
697fb85f	87
e99e88a9	88	timer_setup(&ktimer, pps_ktimer_event, 0);
697fb85f RG	89	mod_timer(&ktimer, jiffies + HZ);
697fb85f RG	90
5e196d34	91	dev_info(pps->dev, "ktimer PPS source registered\n");
697fb85f	92
5e196d34	93	return 0;
697fb85f RG	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");