| Rodolfo Giometti | 697fb85 | 2010-03-10 15:23:45 -0800 | [diff] [blame] | 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 | |
| 22 | |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/time.h> |
| 27 | #include <linux/timer.h> |
| 28 | #include <linux/pps_kernel.h> |
| 29 | |
| 30 | /* |
| 31 | * Global variables |
| 32 | */ |
| 33 | |
| 34 | static int source; |
| 35 | static struct timer_list ktimer; |
| 36 | |
| 37 | /* |
| 38 | * The kernel timer |
| 39 | */ |
| 40 | |
| 41 | static void pps_ktimer_event(unsigned long ptr) |
| 42 | { |
| 43 | struct timespec __ts; |
| 44 | struct pps_ktime ts; |
| 45 | |
| 46 | /* First of all we get the time stamp... */ |
| 47 | getnstimeofday(&__ts); |
| 48 | |
| 49 | pr_info("PPS event at %lu\n", jiffies); |
| 50 | |
| 51 | /* ... and translate it to PPS time data struct */ |
| 52 | ts.sec = __ts.tv_sec; |
| 53 | ts.nsec = __ts.tv_nsec; |
| 54 | |
| 55 | pps_event(source, &ts, PPS_CAPTUREASSERT, NULL); |
| 56 | |
| 57 | mod_timer(&ktimer, jiffies + HZ); |
| 58 | } |
| 59 | |
| 60 | /* |
| 61 | * The echo function |
| 62 | */ |
| 63 | |
| 64 | static void pps_ktimer_echo(int source, int event, void *data) |
| 65 | { |
| 66 | pr_info("echo %s %s for source %d\n", |
| 67 | event & PPS_CAPTUREASSERT ? "assert" : "", |
| 68 | event & PPS_CAPTURECLEAR ? "clear" : "", |
| 69 | source); |
| 70 | } |
| 71 | |
| 72 | /* |
| 73 | * The PPS info struct |
| 74 | */ |
| 75 | |
| 76 | static struct pps_source_info pps_ktimer_info = { |
| 77 | .name = "ktimer", |
| 78 | .path = "", |
| 79 | .mode = PPS_CAPTUREASSERT | PPS_OFFSETASSERT | |
| 80 | PPS_ECHOASSERT | |
| 81 | PPS_CANWAIT | PPS_TSFMT_TSPEC, |
| 82 | .echo = pps_ktimer_echo, |
| 83 | .owner = THIS_MODULE, |
| 84 | }; |
| 85 | |
| 86 | /* |
| 87 | * Module staff |
| 88 | */ |
| 89 | |
| 90 | static void __exit pps_ktimer_exit(void) |
| 91 | { |
| 92 | del_timer_sync(&ktimer); |
| 93 | pps_unregister_source(source); |
| 94 | |
| 95 | pr_info("ktimer PPS source unregistered\n"); |
| 96 | } |
| 97 | |
| 98 | static int __init pps_ktimer_init(void) |
| 99 | { |
| 100 | int ret; |
| 101 | |
| 102 | ret = pps_register_source(&pps_ktimer_info, |
| 103 | PPS_CAPTUREASSERT | PPS_OFFSETASSERT); |
| 104 | if (ret < 0) { |
| 105 | printk(KERN_ERR "cannot register ktimer source\n"); |
| 106 | return ret; |
| 107 | } |
| 108 | source = ret; |
| 109 | |
| 110 | setup_timer(&ktimer, pps_ktimer_event, 0); |
| 111 | mod_timer(&ktimer, jiffies + HZ); |
| 112 | |
| 113 | pr_info("ktimer PPS source registered at %d\n", source); |
| 114 | |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | module_init(pps_ktimer_init); |
| 119 | module_exit(pps_ktimer_exit); |
| 120 | |
| 121 | MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); |
| 122 | MODULE_DESCRIPTION("dummy PPS source by using a kernel timer (just for debug)"); |
| 123 | MODULE_LICENSE("GPL"); |