124 строки
2.7 KiB
C
124 строки
2.7 KiB
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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
#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 int source;
|
||
|
|
static struct timer_list ktimer;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The kernel timer
|
||
|
|
*/
|
||
|
|
|
||
|
|
static void pps_ktimer_event(unsigned long ptr)
|
||
|
|
{
|
||
|
|
struct timespec __ts;
|
||
|
|
struct pps_ktime ts;
|
||
|
|
|
||
|
|
/* First of all we get the time stamp... */
|
||
|
|
getnstimeofday(&__ts);
|
||
|
|
|
||
|
|
pr_info("PPS event at %lu\n", jiffies);
|
||
|
|
|
||
|
|
/* ... and translate it to PPS time data struct */
|
||
|
|
ts.sec = __ts.tv_sec;
|
||
|
|
ts.nsec = __ts.tv_nsec;
|
||
|
|
|
||
|
|
pps_event(source, &ts, PPS_CAPTUREASSERT, NULL);
|
||
|
|
|
||
|
|
mod_timer(&ktimer, jiffies + HZ);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The echo function
|
||
|
|
*/
|
||
|
|
|
||
|
|
static void pps_ktimer_echo(int source, int event, void *data)
|
||
|
|
{
|
||
|
|
pr_info("echo %s %s for source %d\n",
|
||
|
|
event & PPS_CAPTUREASSERT ? "assert" : "",
|
||
|
|
event & PPS_CAPTURECLEAR ? "clear" : "",
|
||
|
|
source);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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)
|
||
|
|
{
|
||
|
|
del_timer_sync(&ktimer);
|
||
|
|
pps_unregister_source(source);
|
||
|
|
|
||
|
|
pr_info("ktimer PPS source unregistered\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __init pps_ktimer_init(void)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = pps_register_source(&pps_ktimer_info,
|
||
|
|
PPS_CAPTUREASSERT | PPS_OFFSETASSERT);
|
||
|
|
if (ret < 0) {
|
||
|
|
printk(KERN_ERR "cannot register ktimer source\n");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
source = ret;
|
||
|
|
|
||
|
|
setup_timer(&ktimer, pps_ktimer_event, 0);
|
||
|
|
mod_timer(&ktimer, jiffies + HZ);
|
||
|
|
|
||
|
|
pr_info("ktimer PPS source registered at %d\n", source);
|
||
|
|
|
||
|
|
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");
|