From: Kallol Biswas <kallol.biswas@efi.com>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: usb printer driver and zero length transfer
Date: Mon, 24 Mar 2003 11:51:50 -0800 [thread overview]
Message-ID: <3E7F61D6.D1017E70@efi.com> (raw)
Hi,
I am new to USB world and looking for clarification on usb
printer's
behavior when transferring data with size multiple of wMaxPacketSize.
I have been running redhat 7.1 (linux kernel 2.4.2-2) on x86 PC with a
USB 1.1 controller. There is a target mode printer driver running on the
other side.
On the host the device file is /dev/usb/lp0.
If a data packet of 64 bytes is sent with
"cat data8 > /dev/usb/lp0" , the size of data8 is 64, a zero length
packet
at the end of the transfer is not sent.
Is this a correct behavior? How do we force the printer driver send
a zero length packet at the end of a transfer if the packet size is
a multiple of wMAxPacketSize?
Kallol
next reply other threads:[~2003-03-24 19:43 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-24 19:51 Kallol Biswas [this message]
2003-03-25 0:28 ` usb printer driver and zero length transfer Greg KH
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