ptp: add the pin GET/SETFUNC ioctls to the testptp program.

This patch adds a option to the test program that lists the
programmable pins on a PTP Hardware Clock device, assuming there
are any such pins. A second option lets the user reprogram the
auxiliary function of a single pin.

Signed-off-by: Richard Cochran <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

Documentation/ptp/testptp.c

···
 		" -i val     index for event/trigger\n"
 		" -k val     measure the time offset between system and phc clock\n"
 		"            for 'val' times (Maximum 25)\n"
+		" -l         list the current pin configuration\n"
+		" -L pin,val configure pin index 'pin' with function 'val'\n"
+		"            the channel index is taken from the '-i' option\n"
+		"            'val' specifies the auxiliary function:\n"
+		"            0 - none\n"
+		"            1 - external time stamp\n"
+		"            2 - periodic output\n"
 		" -p val     enable output with a period of 'val' nanoseconds\n"
 		" -P val     enable or disable (val=1|0) the system clock PPS\n"
 		" -s         set the ptp clock time from the system time\n"
···
 	struct ptp_extts_event event;
 	struct ptp_extts_request extts_request;
 	struct ptp_perout_request perout_request;
+	struct ptp_pin_desc desc;
 	struct timespec ts;
 	struct timex tx;
 
···
 	int extts = 0;
 	int gettime = 0;
 	int index = 0;
+	int list_pins = 0;
 	int oneshot = 0;
 	int pct_offset = 0;
 	int n_samples = 0;
 	int periodic = 0;
 	int perout = -1;
+	int pin_index = -1, pin_func;
 	int pps = -1;
 	int settime = 0;
 
···
 
 	progname = strrchr(argv[0], '/');
 	progname = progname ? 1+progname : argv[0];
-	while (EOF != (c = getopt(argc, argv, "a:A:cd:e:f:ghi:k:p:P:sSt:v"))) {
+	while (EOF != (c = getopt(argc, argv, "a:A:cd:e:f:ghi:k:lL:p:P:sSt:v"))) {
 		switch (c) {
 		case 'a':
 			oneshot = atoi(optarg);
···
 		case 'k':
 			pct_offset = 1;
 			n_samples = atoi(optarg);
+			break;
+		case 'l':
+			list_pins = 1;
+			break;
+		case 'L':
+			cnt = sscanf(optarg, "%d,%d", &pin_index, &pin_func);
+			if (cnt != 2) {
+				usage(progname);
+				return -1;
+			}
 			break;
 		case 'p':
 			perout = atoi(optarg);
···
 			       "  %d programmable alarms\n"
 			       "  %d external time stamp channels\n"
 			       "  %d programmable periodic signals\n"
-			       "  %d pulse per second\n",
+			       "  %d pulse per second\n"
+			       "  %d programmable pins\n",
 			       caps.max_adj,
 			       caps.n_alarm,
 			       caps.n_ext_ts,
 			       caps.n_per_out,
-			       caps.pps);
+			       caps.pps,
+			       caps.n_pins);
 		}
 	}
 
···
 		}
 	}
 
+	if (list_pins) {
+		int n_pins = 0;
+		if (ioctl(fd, PTP_CLOCK_GETCAPS, &caps)) {
+			perror("PTP_CLOCK_GETCAPS");
+		} else {
+			n_pins = caps.n_pins;
+		}
+		for (i = 0; i < n_pins; i++) {
+			desc.index = i;
+			if (ioctl(fd, PTP_PIN_GETFUNC, &desc)) {
+				perror("PTP_PIN_GETFUNC");
+				break;
+			}
+			printf("name %s index %u func %u chan %u\n",
+			       desc.name, desc.index, desc.func, desc.chan);
+		}
+	}
+
 	if (oneshot) {
 		install_handler(SIGALRM, handle_alarm);
 		/* Create a timer. */
···
 			perror("PTP_PEROUT_REQUEST");
 		} else {
 			puts("periodic output request okay");
+		}
+	}
+
+	if (pin_index >= 0) {
+		memset(&desc, 0, sizeof(desc));
+		desc.index = pin_index;
+		desc.func = pin_func;
+		desc.chan = index;
+		if (ioctl(fd, PTP_PIN_SETFUNC, &desc)) {
+			perror("PTP_PIN_SETFUNC");
+		} else {
+			puts("set pin function okay");
 		}
 	}