libusb: implement libusb_fill_bulk_stream_transfer

Bulk streams are essentially bulk transfers with a stream ID. All
requirements from both libusb20 and the kernel are already handled; we
just need to set the stream ID.

Approved by:    markj (mentor), lwhsu(mentor)
Differential Revision: https://reviews.freebsd.org/D51226

lib/libusb/libusb.h

@@ -122,6 +122,7 @@ enum libusb_transfer_type {
 	LIBUSB_TRANSFER_TYPE_ISOCHRONOUS = 1,
 	LIBUSB_TRANSFER_TYPE_BULK = 2,
 	LIBUSB_TRANSFER_TYPE_INTERRUPT = 3,
+	LIBUSB_TRANSFER_TYPE_BULK_STREAM = 4,
 };
 
 enum libusb_standard_request {

lib/libusb/libusb10.c

@@ -1530,6 +1530,7 @@ libusb10_submit_transfer_sub(struct libusb20_device *pdev, uint8_t endpoint)
 		libusb20_tr_set_callback(pxfer0, libusb10_isoc_proxy);
 		break;
 	case LIBUSB_TRANSFER_TYPE_BULK:
+	case LIBUSB_TRANSFER_TYPE_BULK_STREAM:
 	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
 		libusb20_tr_set_callback(pxfer0, libusb10_bulk_intr_proxy);
 		break;

lib/libusb/libusb10_io.c

@@ -780,6 +780,19 @@ libusb_fill_interrupt_transfer(struct libusb_transfer *transfer,
 	transfer->callback = callback;
 }
 
+void
+libusb_fill_bulk_stream_transfer(struct libusb_transfer *transfer,
+    libusb_device_handle *dev_handle, unsigned char endpoint,
+    uint32_t stream_id, unsigned char *buffer, int length,
+    libusb_transfer_cb_fn callback, void *user_data, unsigned int timeout)
+{
+	libusb_fill_bulk_transfer(transfer, dev_handle, endpoint, buffer,
+	    length, callback, user_data, timeout);
+	transfer->type = LIBUSB_TRANSFER_TYPE_BULK_STREAM;
+
+	libusb_transfer_set_stream_id(transfer, stream_id);
+}
+
 void
 libusb_fill_iso_transfer(struct libusb_transfer *transfer, 
     libusb_device_handle *devh, uint8_t endpoint, uint8_t *buf,