[GitHub/mt8127/android_kernel_alcatel_ttab.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(unsigned long ptr)
{
	struct pps_event_time ts;

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

	dev_info(pps->dev, "PPS event at %lu\n", jiffies);

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

	mod_timer(&ktimer, jiffies + HZ);
}

/*
 * The echo function
 */

static void pps_ktimer_echo(struct pps_device *pps, int event, void *data)
{
	dev_info(pps->dev, "echo %s %s\n",
		event & PPS_CAPTUREASSERT ? "assert" : "",
		event & PPS_CAPTURECLEAR ? "clear" : "");
}

/*
 * 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,
	.echo		= pps_ktimer_echo,
	.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;
	}

	setup_timer(&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
	42	static void pps_ktimer_event(unsigned long ptr)
	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
7f7cce74	49	dev_info(pps->dev, "PPS event at %lu\n", jiffies);
697fb85f	50
5e196d34	51	pps_event(pps, &ts, PPS_CAPTUREASSERT, NULL);
697fb85f RG	52
	53	mod_timer(&ktimer, jiffies + HZ);
	54	}
	55
	56	/*
	57	* The echo function
	58	*/
	59
5e196d34	60	static void pps_ktimer_echo(struct pps_device pps, int event, void data)
697fb85f	61	{
5e196d34	62	dev_info(pps->dev, "echo %s %s\n",
697fb85f	63	event & PPS_CAPTUREASSERT ? "assert" : "",
5e196d34	64	event & PPS_CAPTURECLEAR ? "clear" : "");
697fb85f RG	65	}
	66
	67	/*
	68	* The PPS info struct
	69	*/
	70
	71	static struct pps_source_info pps_ktimer_info = {
	72	.name = "ktimer",
	73	.path = "",
	74	.mode = PPS_CAPTUREASSERT \| PPS_OFFSETASSERT \|
	75	PPS_ECHOASSERT \|
	76	PPS_CANWAIT \| PPS_TSFMT_TSPEC,
	77	.echo = pps_ktimer_echo,
	78	.owner = THIS_MODULE,
	79	};
	80
	81	/*
	82	* Module staff
	83	*/
	84
	85	static void __exit pps_ktimer_exit(void)
	86	{
5e196d34	87	dev_info(pps->dev, "ktimer PPS source unregistered\n");
697fb85f	88
5e196d34 AG	89	del_timer_sync(&ktimer);
5e196d34 AG	90	pps_unregister_source(pps);
697fb85f RG	91	}
	92
	93	static int __init pps_ktimer_init(void)
	94	{
5e196d34	95	pps = pps_register_source(&pps_ktimer_info,
697fb85f	96	PPS_CAPTUREASSERT \| PPS_OFFSETASSERT);
5e196d34	97	if (pps == NULL) {
7f7cce74	98	pr_err("cannot register PPS source\n");
5e196d34	99	return -ENOMEM;
697fb85f	100	}
697fb85f RG	101
	102	setup_timer(&ktimer, pps_ktimer_event, 0);
	103	mod_timer(&ktimer, jiffies + HZ);
	104
5e196d34	105	dev_info(pps->dev, "ktimer PPS source registered\n");
697fb85f	106
5e196d34	107	return 0;
697fb85f RG	108	}
	109
	110	module_init(pps_ktimer_init);
	111	module_exit(pps_ktimer_exit);
	112
	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");