1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20#define _GNU_SOURCE
21#define __SANE_USERSPACE_TYPES__
22#include <errno.h>
23#include <fcntl.h>
24#include <inttypes.h>
25#include <math.h>
26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
30#include <sys/ioctl.h>
31#include <sys/mman.h>
32#include <sys/stat.h>
33#include <sys/time.h>
34#include <sys/timex.h>
35#include <sys/types.h>
36#include <time.h>
37#include <unistd.h>
38
39#include <linux/ptp_clock.h>
40
41#define DEVICE "/dev/ptp0"
42
43#ifndef ADJ_SETOFFSET
44#define ADJ_SETOFFSET 0x0100
45#endif
46
47#ifndef CLOCK_INVALID
48#define CLOCK_INVALID -1
49#endif
50
51
52#if !__GLIBC_PREREQ(2, 14)
53#include <sys/syscall.h>
54static int clock_adjtime(clockid_t id, struct timex *tx)
55{
56 return syscall(__NR_clock_adjtime, id, tx);
57}
58#endif
59
60static clockid_t get_clockid(int fd)
61{
62#define CLOCKFD 3
63#define FD_TO_CLOCKID(fd) ((~(clockid_t) (fd) << 3) | CLOCKFD)
64
65 return FD_TO_CLOCKID(fd);
66}
67
68static void handle_alarm(int s)
69{
70 printf("received signal %d\n", s);
71}
72
73static int install_handler(int signum, void (*handler)(int))
74{
75 struct sigaction action;
76 sigset_t mask;
77
78
79 sigemptyset(&mask);
80 sigaddset(&mask, signum);
81 sigprocmask(SIG_UNBLOCK, &mask, NULL);
82
83
84 action.sa_handler = handler;
85 action.sa_flags = 0;
86 sigemptyset(&action.sa_mask);
87 sigaction(signum, &action, NULL);
88
89 return 0;
90}
91
92static long ppb_to_scaled_ppm(int ppb)
93{
94
95
96
97
98
99
100
101
102
103
104
105 return (long) (ppb * 65.536);
106}
107
108static int64_t pctns(struct ptp_clock_time *t)
109{
110 return t->sec * 1000000000LL + t->nsec;
111}
112
113static void usage(char *progname)
114{
115 fprintf(stderr,
116 "usage: %s [options]\n"
117 " -a val request a one-shot alarm after 'val' seconds\n"
118 " -A val request a periodic alarm every 'val' seconds\n"
119 " -c query the ptp clock's capabilities\n"
120 " -d name device to open\n"
121 " -e val read 'val' external time stamp events\n"
122 " -f val adjust the ptp clock frequency by 'val' ppb\n"
123 " -g get the ptp clock time\n"
124 " -h prints this message\n"
125 " -i val index for event/trigger\n"
126 " -k val measure the time offset between system and phc clock\n"
127 " for 'val' times (Maximum 25)\n"
128 " -l list the current pin configuration\n"
129 " -L pin,val configure pin index 'pin' with function 'val'\n"
130 " the channel index is taken from the '-i' option\n"
131 " 'val' specifies the auxiliary function:\n"
132 " 0 - none\n"
133 " 1 - external time stamp\n"
134 " 2 - periodic output\n"
135 " -p val enable output with a period of 'val' nanoseconds\n"
136 " -P val enable or disable (val=1|0) the system clock PPS\n"
137 " -s set the ptp clock time from the system time\n"
138 " -S set the system time from the ptp clock time\n"
139 " -t val shift the ptp clock time by 'val' seconds\n"
140 " -T val set the ptp clock time to 'val' seconds\n",
141 progname);
142}
143
144int main(int argc, char *argv[])
145{
146 struct ptp_clock_caps caps;
147 struct ptp_extts_event event;
148 struct ptp_extts_request extts_request;
149 struct ptp_perout_request perout_request;
150 struct ptp_pin_desc desc;
151 struct timespec ts;
152 struct timex tx;
153
154 static timer_t timerid;
155 struct itimerspec timeout;
156 struct sigevent sigevent;
157
158 struct ptp_clock_time *pct;
159 struct ptp_sys_offset *sysoff;
160
161
162 char *progname;
163 unsigned int i;
164 int c, cnt, fd;
165
166 char *device = DEVICE;
167 clockid_t clkid;
168 int adjfreq = 0x7fffffff;
169 int adjtime = 0;
170 int capabilities = 0;
171 int extts = 0;
172 int gettime = 0;
173 int index = 0;
174 int list_pins = 0;
175 int oneshot = 0;
176 int pct_offset = 0;
177 int n_samples = 0;
178 int periodic = 0;
179 int perout = -1;
180 int pin_index = -1, pin_func;
181 int pps = -1;
182 int seconds = 0;
183 int settime = 0;
184
185 int64_t t1, t2, tp;
186 int64_t interval, offset;
187
188 progname = strrchr(argv[0], '/');
189 progname = progname ? 1+progname : argv[0];
190 while (EOF != (c = getopt(argc, argv, "a:A:cd:e:f:ghi:k:lL:p:P:sSt:T:v"))) {
191 switch (c) {
192 case 'a':
193 oneshot = atoi(optarg);
194 break;
195 case 'A':
196 periodic = atoi(optarg);
197 break;
198 case 'c':
199 capabilities = 1;
200 break;
201 case 'd':
202 device = optarg;
203 break;
204 case 'e':
205 extts = atoi(optarg);
206 break;
207 case 'f':
208 adjfreq = atoi(optarg);
209 break;
210 case 'g':
211 gettime = 1;
212 break;
213 case 'i':
214 index = atoi(optarg);
215 break;
216 case 'k':
217 pct_offset = 1;
218 n_samples = atoi(optarg);
219 break;
220 case 'l':
221 list_pins = 1;
222 break;
223 case 'L':
224 cnt = sscanf(optarg, "%d,%d", &pin_index, &pin_func);
225 if (cnt != 2) {
226 usage(progname);
227 return -1;
228 }
229 break;
230 case 'p':
231 perout = atoi(optarg);
232 break;
233 case 'P':
234 pps = atoi(optarg);
235 break;
236 case 's':
237 settime = 1;
238 break;
239 case 'S':
240 settime = 2;
241 break;
242 case 't':
243 adjtime = atoi(optarg);
244 break;
245 case 'T':
246 settime = 3;
247 seconds = atoi(optarg);
248 break;
249 case 'h':
250 usage(progname);
251 return 0;
252 case '?':
253 default:
254 usage(progname);
255 return -1;
256 }
257 }
258
259 fd = open(device, O_RDWR);
260 if (fd < 0) {
261 fprintf(stderr, "opening %s: %s\n", device, strerror(errno));
262 return -1;
263 }
264
265 clkid = get_clockid(fd);
266 if (CLOCK_INVALID == clkid) {
267 fprintf(stderr, "failed to read clock id\n");
268 return -1;
269 }
270
271 if (capabilities) {
272 if (ioctl(fd, PTP_CLOCK_GETCAPS, &caps)) {
273 perror("PTP_CLOCK_GETCAPS");
274 } else {
275 printf("capabilities:\n"
276 " %d maximum frequency adjustment (ppb)\n"
277 " %d programmable alarms\n"
278 " %d external time stamp channels\n"
279 " %d programmable periodic signals\n"
280 " %d pulse per second\n"
281 " %d programmable pins\n"
282 " %d cross timestamping\n",
283 caps.max_adj,
284 caps.n_alarm,
285 caps.n_ext_ts,
286 caps.n_per_out,
287 caps.pps,
288 caps.n_pins,
289 caps.cross_timestamping);
290 }
291 }
292
293 if (0x7fffffff != adjfreq) {
294 memset(&tx, 0, sizeof(tx));
295 tx.modes = ADJ_FREQUENCY;
296 tx.freq = ppb_to_scaled_ppm(adjfreq);
297 if (clock_adjtime(clkid, &tx)) {
298 perror("clock_adjtime");
299 } else {
300 puts("frequency adjustment okay");
301 }
302 }
303
304 if (adjtime) {
305 memset(&tx, 0, sizeof(tx));
306 tx.modes = ADJ_SETOFFSET;
307 tx.time.tv_sec = adjtime;
308 tx.time.tv_usec = 0;
309 if (clock_adjtime(clkid, &tx) < 0) {
310 perror("clock_adjtime");
311 } else {
312 puts("time shift okay");
313 }
314 }
315
316 if (gettime) {
317 if (clock_gettime(clkid, &ts)) {
318 perror("clock_gettime");
319 } else {
320 printf("clock time: %ld.%09ld or %s",
321 ts.tv_sec, ts.tv_nsec, ctime(&ts.tv_sec));
322 }
323 }
324
325 if (settime == 1) {
326 clock_gettime(CLOCK_REALTIME, &ts);
327 if (clock_settime(clkid, &ts)) {
328 perror("clock_settime");
329 } else {
330 puts("set time okay");
331 }
332 }
333
334 if (settime == 2) {
335 clock_gettime(clkid, &ts);
336 if (clock_settime(CLOCK_REALTIME, &ts)) {
337 perror("clock_settime");
338 } else {
339 puts("set time okay");
340 }
341 }
342
343 if (settime == 3) {
344 ts.tv_sec = seconds;
345 ts.tv_nsec = 0;
346 if (clock_settime(clkid, &ts)) {
347 perror("clock_settime");
348 } else {
349 puts("set time okay");
350 }
351 }
352
353 if (extts) {
354 memset(&extts_request, 0, sizeof(extts_request));
355 extts_request.index = index;
356 extts_request.flags = PTP_ENABLE_FEATURE;
357 if (ioctl(fd, PTP_EXTTS_REQUEST, &extts_request)) {
358 perror("PTP_EXTTS_REQUEST");
359 extts = 0;
360 } else {
361 puts("external time stamp request okay");
362 }
363 for (; extts; extts--) {
364 cnt = read(fd, &event, sizeof(event));
365 if (cnt != sizeof(event)) {
366 perror("read");
367 break;
368 }
369 printf("event index %u at %lld.%09u\n", event.index,
370 event.t.sec, event.t.nsec);
371 fflush(stdout);
372 }
373
374 extts_request.flags = 0;
375 if (ioctl(fd, PTP_EXTTS_REQUEST, &extts_request)) {
376 perror("PTP_EXTTS_REQUEST");
377 }
378 }
379
380 if (list_pins) {
381 int n_pins = 0;
382 if (ioctl(fd, PTP_CLOCK_GETCAPS, &caps)) {
383 perror("PTP_CLOCK_GETCAPS");
384 } else {
385 n_pins = caps.n_pins;
386 }
387 for (i = 0; i < n_pins; i++) {
388 desc.index = i;
389 if (ioctl(fd, PTP_PIN_GETFUNC, &desc)) {
390 perror("PTP_PIN_GETFUNC");
391 break;
392 }
393 printf("name %s index %u func %u chan %u\n",
394 desc.name, desc.index, desc.func, desc.chan);
395 }
396 }
397
398 if (oneshot) {
399 install_handler(SIGALRM, handle_alarm);
400
401 sigevent.sigev_notify = SIGEV_SIGNAL;
402 sigevent.sigev_signo = SIGALRM;
403 if (timer_create(clkid, &sigevent, &timerid)) {
404 perror("timer_create");
405 return -1;
406 }
407
408 memset(&timeout, 0, sizeof(timeout));
409 timeout.it_value.tv_sec = oneshot;
410 if (timer_settime(timerid, 0, &timeout, NULL)) {
411 perror("timer_settime");
412 return -1;
413 }
414 pause();
415 timer_delete(timerid);
416 }
417
418 if (periodic) {
419 install_handler(SIGALRM, handle_alarm);
420
421 sigevent.sigev_notify = SIGEV_SIGNAL;
422 sigevent.sigev_signo = SIGALRM;
423 if (timer_create(clkid, &sigevent, &timerid)) {
424 perror("timer_create");
425 return -1;
426 }
427
428 memset(&timeout, 0, sizeof(timeout));
429 timeout.it_interval.tv_sec = periodic;
430 timeout.it_value.tv_sec = periodic;
431 if (timer_settime(timerid, 0, &timeout, NULL)) {
432 perror("timer_settime");
433 return -1;
434 }
435 while (1) {
436 pause();
437 }
438 timer_delete(timerid);
439 }
440
441 if (perout >= 0) {
442 if (clock_gettime(clkid, &ts)) {
443 perror("clock_gettime");
444 return -1;
445 }
446 memset(&perout_request, 0, sizeof(perout_request));
447 perout_request.index = index;
448 perout_request.start.sec = ts.tv_sec + 2;
449 perout_request.start.nsec = 0;
450 perout_request.period.sec = 0;
451 perout_request.period.nsec = perout;
452 if (ioctl(fd, PTP_PEROUT_REQUEST, &perout_request)) {
453 perror("PTP_PEROUT_REQUEST");
454 } else {
455 puts("periodic output request okay");
456 }
457 }
458
459 if (pin_index >= 0) {
460 memset(&desc, 0, sizeof(desc));
461 desc.index = pin_index;
462 desc.func = pin_func;
463 desc.chan = index;
464 if (ioctl(fd, PTP_PIN_SETFUNC, &desc)) {
465 perror("PTP_PIN_SETFUNC");
466 } else {
467 puts("set pin function okay");
468 }
469 }
470
471 if (pps != -1) {
472 int enable = pps ? 1 : 0;
473 if (ioctl(fd, PTP_ENABLE_PPS, enable)) {
474 perror("PTP_ENABLE_PPS");
475 } else {
476 puts("pps for system time request okay");
477 }
478 }
479
480 if (pct_offset) {
481 if (n_samples <= 0 || n_samples > 25) {
482 puts("n_samples should be between 1 and 25");
483 usage(progname);
484 return -1;
485 }
486
487 sysoff = calloc(1, sizeof(*sysoff));
488 if (!sysoff) {
489 perror("calloc");
490 return -1;
491 }
492 sysoff->n_samples = n_samples;
493
494 if (ioctl(fd, PTP_SYS_OFFSET, sysoff))
495 perror("PTP_SYS_OFFSET");
496 else
497 puts("system and phc clock time offset request okay");
498
499 pct = &sysoff->ts[0];
500 for (i = 0; i < sysoff->n_samples; i++) {
501 t1 = pctns(pct+2*i);
502 tp = pctns(pct+2*i+1);
503 t2 = pctns(pct+2*i+2);
504 interval = t2 - t1;
505 offset = (t2 + t1) / 2 - tp;
506
507 printf("system time: %lld.%u\n",
508 (pct+2*i)->sec, (pct+2*i)->nsec);
509 printf("phc time: %lld.%u\n",
510 (pct+2*i+1)->sec, (pct+2*i+1)->nsec);
511 printf("system time: %lld.%u\n",
512 (pct+2*i+2)->sec, (pct+2*i+2)->nsec);
513 printf("system/phc clock time offset is %" PRId64 " ns\n"
514 "system clock time delay is %" PRId64 " ns\n",
515 offset, interval);
516 }
517
518 free(sysoff);
519 }
520
521 close(fd);
522 return 0;
523}
524
