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-rw-r--r--usbmuxd/usb-linux.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/usbmuxd/usb-linux.c b/usbmuxd/usb-linux.c
index fb22d03..2d6053e 100644
--- a/usbmuxd/usb-linux.c
+++ b/usbmuxd/usb-linux.c
@@ -33,6 +33,17 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#include "log.h"
#include "device.h"
+#ifndef LIBUSB_TRANSFER_ZERO_PACKET
+#warning Your libusb is missing proper Zero Length Packet support!
+#warning
+#warning If you are using a recent libusb Git, things may or may not work.
+#warning If you are using libusb 1.0.2 or earlier, things will definitely not work
+#warning properly.
+#warning
+#warning Please apply the patch in the contrib/ directory to your libusb 1.0 tree.
+#define EXPLICIT_ZLP_TRANSACTION
+#endif
+
// interval for device connection/disconnection polling, in milliseconds
// we need this because there is currently no asynchronous device discovery mechanism in libusb
#define DEVICE_POLL_TIME 1000
@@ -134,15 +145,33 @@ int usb_send(struct usb_device *dev, const unsigned char *buf, int length)
struct libusb_transfer *xfer = libusb_alloc_transfer(0);
libusb_fill_bulk_transfer(xfer, dev->dev, BULK_OUT, (void*)buf, length, tx_callback, dev, 0);
xfer->flags = LIBUSB_TRANSFER_SHORT_NOT_OK;
+#ifndef EXPLICIT_ZLP_TRANSACTION
if (length % dev->wMaxPacketSize == 0) {
xfer->flags |= LIBUSB_TRANSFER_ZERO_PACKET;
}
+#endif
if((res = libusb_submit_transfer(xfer)) < 0) {
usbmuxd_log(LL_ERROR, "Failed to submit TX transfer %p len %d to device %d-%d: %d", buf, length, dev->bus, dev->address, res);
libusb_free_transfer(xfer);
return res;
}
collection_add(&dev->tx_xfers, xfer);
+#ifdef EXPLICIT_ZLP_TRANSACTION
+ if (length % dev->wMaxPacketSize == 0) {
+ usbmuxd_log(LL_DEBUG, "Send ZLP");
+ // Send Zero Length Packet
+ xfer = libusb_alloc_transfer(0);
+ void *buffer = malloc(1);
+ libusb_fill_bulk_transfer(xfer, dev->dev, BULK_OUT, buffer, 0, tx_callback, dev, 0);
+ xfer->flags = LIBUSB_TRANSFER_SHORT_NOT_OK;
+ if((res = libusb_submit_transfer(xfer)) < 0) {
+ usbmuxd_log(LL_ERROR, "Failed to submit TX ZLP transfer to device %d-%d: %d", dev->bus, dev->address, res);
+ libusb_free_transfer(xfer);
+ return res;
+ }
+ collection_add(&dev->tx_xfers, xfer);
+ }
+#endif
return 0;
}