mirror of https://gitee.com/openkylin/linux.git
124 lines
2.7 KiB
C
124 lines
2.7 KiB
C
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/*
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* pps-ktimer.c -- kernel timer test client
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*
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*
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* Copyright (C) 2005-2006 Rodolfo Giometti <giometti@linux.it>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/time.h>
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#include <linux/timer.h>
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#include <linux/pps_kernel.h>
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/*
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* Global variables
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*/
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static int source;
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static struct timer_list ktimer;
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/*
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* The kernel timer
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*/
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static void pps_ktimer_event(unsigned long ptr)
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{
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struct timespec __ts;
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struct pps_ktime ts;
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/* First of all we get the time stamp... */
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getnstimeofday(&__ts);
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pr_info("PPS event at %lu\n", jiffies);
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/* ... and translate it to PPS time data struct */
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ts.sec = __ts.tv_sec;
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ts.nsec = __ts.tv_nsec;
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pps_event(source, &ts, PPS_CAPTUREASSERT, NULL);
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mod_timer(&ktimer, jiffies + HZ);
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}
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/*
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* The echo function
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*/
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static void pps_ktimer_echo(int source, int event, void *data)
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{
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pr_info("echo %s %s for source %d\n",
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event & PPS_CAPTUREASSERT ? "assert" : "",
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event & PPS_CAPTURECLEAR ? "clear" : "",
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source);
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}
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/*
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* The PPS info struct
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*/
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static struct pps_source_info pps_ktimer_info = {
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.name = "ktimer",
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.path = "",
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.mode = PPS_CAPTUREASSERT | PPS_OFFSETASSERT |
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PPS_ECHOASSERT |
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PPS_CANWAIT | PPS_TSFMT_TSPEC,
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.echo = pps_ktimer_echo,
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.owner = THIS_MODULE,
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};
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/*
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* Module staff
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*/
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static void __exit pps_ktimer_exit(void)
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{
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del_timer_sync(&ktimer);
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pps_unregister_source(source);
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pr_info("ktimer PPS source unregistered\n");
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}
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static int __init pps_ktimer_init(void)
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{
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int ret;
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ret = pps_register_source(&pps_ktimer_info,
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PPS_CAPTUREASSERT | PPS_OFFSETASSERT);
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if (ret < 0) {
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printk(KERN_ERR "cannot register ktimer source\n");
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return ret;
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}
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source = ret;
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setup_timer(&ktimer, pps_ktimer_event, 0);
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mod_timer(&ktimer, jiffies + HZ);
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pr_info("ktimer PPS source registered at %d\n", source);
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return 0;
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}
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module_init(pps_ktimer_init);
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module_exit(pps_ktimer_exit);
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MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
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MODULE_DESCRIPTION("dummy PPS source by using a kernel timer (just for debug)");
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MODULE_LICENSE("GPL");
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