linux-kernel - Regarding USB-to-serial device driver

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Message-Id: <20100922052107.M44650@admin-gateway.ncra.tifr.res.in>
Date:	Wed, 22 Sep 2010 11:02:46 +0530
From:	"Raju Rameshwar Uprade" <rajsingh@...a.tifr.res.in>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Regarding USB-to-serial device driver



Greg,
      I am facing some problem in data copying.
I am having a const unsigned char *buf which contains 02 08 00 00 00 00 00 00 f8.
which is copied in port->write_urb->transfer_buffer and sent on ttyUSB0 using
usb_submit_urb(port->write_urb, GFP_ATOMIC).

But  I want to send the data bytes is a particular fashion.

1. I want to Add Mark parity. 
2. Send the data byte 02 ( Address of a device )

3. Add Space parity .
4. send the data byte 08 00 00 00 00 00 00 f8 ( Null cmd + check sum )

Kindly help me.I am facing the problem in separating the data bytes so that I can send
the data bytes separately using usb_submit_urb.

Thanks,
Raj. 
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