| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
|---|---|
| 2 | /* |
| 3 | * pps-ktimer.c -- kernel timer test client |
| 4 | * |
| 5 | * Copyright (C) 2005-2006 Rodolfo Giometti <giometti@linux.it> |
| 6 | */ |
| 7 | |
| 8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 9 | |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/time.h> |
| 14 | #include <linux/timer.h> |
| 15 | #include <linux/pps_kernel.h> |
| 16 | |
| 17 | /* |
| 18 | * Global variables |
| 19 | */ |
| 20 | |
| 21 | static struct pps_device *pps; |
| 22 | static struct timer_list ktimer; |
| 23 | |
| 24 | /* |
| 25 | * The kernel timer |
| 26 | */ |
| 27 | |
| 28 | static void pps_ktimer_event(struct timer_list *unused) |
| 29 | { |
| 30 | struct pps_event_time ts; |
| 31 | |
| 32 | /* First of all we get the time stamp... */ |
| 33 | pps_get_ts(ts: &ts); |
| 34 | |
| 35 | pps_event(pps, ts: &ts, PPS_CAPTUREASSERT, NULL); |
| 36 | |
| 37 | mod_timer(timer: &ktimer, expires: jiffies + HZ); |
| 38 | } |
| 39 | |
| 40 | /* |
| 41 | * The PPS info struct |
| 42 | */ |
| 43 | |
| 44 | static struct pps_source_info pps_ktimer_info = { |
| 45 | .name = "ktimer", |
| 46 | .path = "", |
| 47 | .mode = PPS_CAPTUREASSERT | PPS_OFFSETASSERT | |
| 48 | PPS_ECHOASSERT | |
| 49 | PPS_CANWAIT | PPS_TSFMT_TSPEC, |
| 50 | .owner = THIS_MODULE, |
| 51 | }; |
| 52 | |
| 53 | /* |
| 54 | * Module staff |
| 55 | */ |
| 56 | |
| 57 | static void __exit pps_ktimer_exit(void) |
| 58 | { |
| 59 | dev_info(pps->dev, "ktimer PPS source unregistered\n"); |
| 60 | |
| 61 | del_timer_sync(timer: &ktimer); |
| 62 | pps_unregister_source(pps); |
| 63 | } |
| 64 | |
| 65 | static int __init pps_ktimer_init(void) |
| 66 | { |
| 67 | pps = pps_register_source(info: &pps_ktimer_info, |
| 68 | PPS_CAPTUREASSERT | PPS_OFFSETASSERT); |
| 69 | if (IS_ERR(ptr: pps)) { |
| 70 | pr_err("cannot register PPS source\n"); |
| 71 | return PTR_ERR(ptr: pps); |
| 72 | } |
| 73 | |
| 74 | timer_setup(&ktimer, pps_ktimer_event, 0); |
| 75 | mod_timer(timer: &ktimer, expires: jiffies + HZ); |
| 76 | |
| 77 | dev_info(pps->dev, "ktimer PPS source registered\n"); |
| 78 | |
| 79 | return 0; |
| 80 | } |
| 81 | |
| 82 | module_init(pps_ktimer_init); |
| 83 | module_exit(pps_ktimer_exit); |
| 84 | |
| 85 | MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); |
| 86 | MODULE_DESCRIPTION("dummy PPS source by using a kernel timer (just for debug)"); |
| 87 | MODULE_LICENSE("GPL"); |
| 88 |