diff options
Diffstat (limited to 'contrib/libusb-New-flag-LIBUSB_TRANSFER_ZERO_PACKET.patch')
| -rw-r--r-- | contrib/libusb-New-flag-LIBUSB_TRANSFER_ZERO_PACKET.patch | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/contrib/libusb-New-flag-LIBUSB_TRANSFER_ZERO_PACKET.patch b/contrib/libusb-New-flag-LIBUSB_TRANSFER_ZERO_PACKET.patch new file mode 100644 index 0000000..84d8a0a --- /dev/null +++ b/contrib/libusb-New-flag-LIBUSB_TRANSFER_ZERO_PACKET.patch @@ -0,0 +1,72 @@ +From 13123672fc1edb1e8ce52f60eef045e3c901e5d6 Mon Sep 17 00:00:00 2001 +From: Nikias Bassen <nikias@gmx.li> +Date: Sat, 5 Sep 2009 15:42:01 +0200 +Subject: [PATCH] New flag LIBUSB_TRANSFER_ZERO_PACKET for bulk/interrupt transfers. + +This flag will let the kernel append an additional zero-length packet +to a tansfer. This is required for certain devices when sending packets +with a size that is a multiple of wMaxPacketSize. +--- + libusb/libusb.h | 18 +++++++++++++++++- + libusb/os/linux_usbfs.c | 3 +++ + libusb/os/linux_usbfs.h | 1 + + 3 files changed, 21 insertions(+), 1 deletions(-) + +diff --git a/libusb/libusb.h b/libusb/libusb.h +index 1126380..bf7f02d 100644 +--- a/libusb/libusb.h ++++ b/libusb/libusb.h +@@ -672,7 +672,23 @@ enum libusb_transfer_flags { + * If this flag is set, it is illegal to call libusb_free_transfer() + * from your transfer callback, as this will result in a double-free + * when this flag is acted upon. */ +- LIBUSB_TRANSFER_FREE_TRANSFER = 1<<2 ++ LIBUSB_TRANSFER_FREE_TRANSFER = 1<<2, ++ ++ /** If this flag is set, a zero-length packet will be appended to ++ * the transfer indicating that the transfer is complete. ++ * Some devices require to be notified when a transfer is complete. ++ * Usually a device knows about the end of the transfer if the last ++ * packet's size is less than wMaxPacketSize. ++ * But if the last packet of a transfer has _exactly_ the size of ++ * wMaxPacketSize, the device does not know that it is the last ++ * packet. This is where a zero-length packet is required, which ++ * will let the device know that the transfer is complete. ++ * ++ * This flag is valid for the following transfer types: ++ * LIBUSB_TRANSFER_TYPE_BULK ++ * LIBUSB_TRANSFER_TYPE_INTERRUPT ++ */ ++ LIBUSB_TRANSFER_ZERO_PACKET = 1<<3 + }; + + /** \ingroup asyncio +diff --git a/libusb/os/linux_usbfs.c b/libusb/os/linux_usbfs.c +index 1280188..816bcbf 100644 +--- a/libusb/os/linux_usbfs.c ++++ b/libusb/os/linux_usbfs.c +@@ -1307,6 +1307,9 @@ static int submit_bulk_transfer(struct usbi_transfer *itransfer, + else + urb->buffer_length = MAX_BULK_BUFFER_LENGTH; + ++ if (i == num_urbs -1 && (transfer->flags & LIBUSB_TRANSFER_ZERO_PACKET)) ++ urb->flags |= USBFS_URB_ZERO_PACKET; ++ + r = ioctl(dpriv->fd, IOCTL_USBFS_SUBMITURB, urb); + if (r < 0) { + int j; +diff --git a/libusb/os/linux_usbfs.h b/libusb/os/linux_usbfs.h +index fdf5e9b..9ed0b4f 100644 +--- a/libusb/os/linux_usbfs.h ++++ b/libusb/os/linux_usbfs.h +@@ -63,6 +63,7 @@ struct usbfs_getdriver { + #define USBFS_URB_DISABLE_SPD 1 + #define USBFS_URB_ISO_ASAP 2 + #define USBFS_URB_QUEUE_BULK 0x10 ++#define USBFS_URB_ZERO_PACKET 0x40 + + enum usbfs_urb_type { + USBFS_URB_TYPE_ISO = 0, +-- +1.6.0.4 + |