X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=src%2Fusb.c;h=9c34b38ad1bdb204d89c5a16f2631c11fb7617f0;hb=515ab0889ebde4b373d620044a1a98da37153056;hp=c3279d0ae1ef58640013483f9b6711deca9be15a;hpb=155b680da482cea2381becb73c51cfb838bff31e;p=libsigrok.git

diff --git a/src/usb.c b/src/usb.c
index c3279d0a..9c34b38a 100644
--- a/src/usb.c
+++ b/src/usb.c
@@ -20,6 +20,7 @@
  */
 
 #include <stdlib.h>
+#include <memory.h>
 #include <glib.h>
 #include <libusb.h>
 #include "libsigrok.h"
@@ -269,3 +270,41 @@ SR_PRIV int usb_source_remove(struct sr_session *session, struct sr_context *ctx
 
 	return SR_OK;
 }
+
+SR_PRIV int usb_get_port_path(libusb_device *dev, char *path, int path_len)
+{
+	uint8_t port_numbers[8];
+	int i, n, len;
+
+/*
+ * FreeBSD requires that devices prior to calling libusb_get_port_numbers()
+ * have been opened with libusb_open().
+ */
+#ifdef __FreeBSD__
+	struct libusb_device_handle *devh;
+	if (libusb_open(dev, &devh) != 0)
+		return SR_ERR;
+#endif
+	n = libusb_get_port_numbers(dev, port_numbers, sizeof(port_numbers));
+#ifdef __FreeBSD__
+	libusb_close(devh);
+#endif
+
+/* Workaround FreeBSD libusb_get_port_numbers() returning 0. */
+#ifdef __FreeBSD__
+	if (n == 0) {
+		port_numbers[0] = libusb_get_device_address(dev);
+		n = 1;
+	}
+#endif
+	if (n < 1)
+		return SR_ERR;
+
+	len = snprintf(path, path_len, "usb/%d-%d",
+	               libusb_get_bus_number(dev), port_numbers[0]);
+
+	for (i = 1; i < n; i++)
+		len += snprintf(path+len, path_len-len, ".%d", port_numbers[i]);
+
+	return SR_OK;
+}