Fix FreeBSD issue with libusb_get_port_numbers()

[libsigrok.git] / src / usb.c

diff --git a/src/usb.c b/src/usb.c
index 8bdb8d60d07e36f794aefb99bf2298fcefb0bb99..9c34b38ad1bdb204d89c5a16f2631c11fb7617f0 100644 (file)
--- a/src/usb.c
+++ b/src/usb.c
@@ -276,8 +276,27 @@ 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;