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