/* * 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");