diff options
Diffstat (limited to 'tools/testing/selftests/ptp/testptp.c')
| -rw-r--r-- | tools/testing/selftests/ptp/testptp.c | 37 |
1 files changed, 23 insertions, 14 deletions
diff --git a/tools/testing/selftests/ptp/testptp.c b/tools/testing/selftests/ptp/testptp.c index 58064151f2c8..edc08a4433fd 100644 --- a/tools/testing/selftests/ptp/testptp.c +++ b/tools/testing/selftests/ptp/testptp.c @@ -140,6 +140,7 @@ static void usage(char *progname) " -H val set output phase to 'val' nanoseconds (requires -p)\n" " -w val set output pulse width to 'val' nanoseconds (requires -p)\n" " -P val enable or disable (val=1|0) the system clock PPS\n" + " -r open the ptp clock in readonly mode\n" " -s set the ptp clock time from the system time\n" " -S set the system time from the ptp clock time\n" " -t val shift the ptp clock time by 'val' seconds\n" @@ -188,6 +189,7 @@ int main(int argc, char *argv[]) int pin_index = -1, pin_func; int pps = -1; int seconds = 0; + int readonly = 0; int settime = 0; int channel = -1; clockid_t ext_clockid = CLOCK_REALTIME; @@ -200,7 +202,7 @@ int main(int argc, char *argv[]) progname = strrchr(argv[0], '/'); progname = progname ? 1+progname : argv[0]; - while (EOF != (c = getopt(argc, argv, "cd:e:f:F:ghH:i:k:lL:n:o:p:P:sSt:T:w:x:Xy:z"))) { + while (EOF != (c = getopt(argc, argv, "cd:e:f:F:ghH:i:k:lL:n:o:p:P:rsSt:T:w:x:Xy:z"))) { switch (c) { case 'c': capabilities = 1; @@ -252,6 +254,9 @@ int main(int argc, char *argv[]) case 'P': pps = atoi(optarg); break; + case 'r': + readonly = 1; + break; case 's': settime = 1; break; @@ -308,7 +313,7 @@ int main(int argc, char *argv[]) } } - fd = open(device, O_RDWR); + fd = open(device, readonly ? O_RDONLY : O_RDWR); if (fd < 0) { fprintf(stderr, "opening %s: %s\n", device, strerror(errno)); return -1; @@ -436,14 +441,16 @@ int main(int argc, char *argv[]) } if (extts) { - memset(&extts_request, 0, sizeof(extts_request)); - extts_request.index = index; - extts_request.flags = PTP_ENABLE_FEATURE; - if (ioctl(fd, PTP_EXTTS_REQUEST, &extts_request)) { - perror("PTP_EXTTS_REQUEST"); - extts = 0; - } else { - puts("external time stamp request okay"); + if (!readonly) { + memset(&extts_request, 0, sizeof(extts_request)); + extts_request.index = index; + extts_request.flags = PTP_ENABLE_FEATURE; + if (ioctl(fd, PTP_EXTTS_REQUEST, &extts_request)) { + perror("PTP_EXTTS_REQUEST"); + extts = 0; + } else { + puts("external time stamp request okay"); + } } for (; extts; extts--) { cnt = read(fd, &event, sizeof(event)); @@ -455,10 +462,12 @@ int main(int argc, char *argv[]) event.t.sec, event.t.nsec); fflush(stdout); } - /* Disable the feature again. */ - extts_request.flags = 0; - if (ioctl(fd, PTP_EXTTS_REQUEST, &extts_request)) { - perror("PTP_EXTTS_REQUEST"); + if (!readonly) { + /* Disable the feature again. */ + extts_request.flags = 0; + if (ioctl(fd, PTP_EXTTS_REQUEST, &extts_request)) { + perror("PTP_EXTTS_REQUEST"); + } } } |