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

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Message-Id: <20100928091520.M79654@admin-gateway.ncra.tifr.res.in>
Date:	Tue, 28 Sep 2010 14:51:57 +0530
From:	"Raju Rameshwar Uprade" <rajsingh@...a.tifr.res.in>
To:	Greg KH <gregkh@...e.de>,
	Raju Rameshwar Uprade <rajsingh@...a.tifr.res.in>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Regarding USB-to-serial device driver

Hello Greg,
 
      I am using pl2303.c ( USB to serial device driver ) to communicate to various
devices connected in parallel using RS-485 interface card.

I am now able to separate the Address byte and data bytes.Driver send the Address byte
properly but when it tries to send the data bytes following error occurs,

pl2303_mcm ttyUSB0: pl2303_write - failed submitting write urb, error -22.

I have also attached the kernel log.

/home/teleset/Desktop/USB-Serial/pl2303_mcm.c: pl2303_write before any thing - port 0, 9
bytes 
/home/teleset/Desktop/USB-Serial/pl2303_mcm.c: set_control_lines - value = 3, retval = 0
 
 Data in The BUF 0 is -----> 02 
 
 Data in The BUF 1 is -----> 08 
 
 Data in The BUF 2 is -----> 00 
 
 Data in The BUF 3 is -----> 00 
 
 Data in The BUF 4 is -----> 00 
 
 Data in The BUF 5 is -----> 00 
 
 Data in The BUF 6 is -----> 00 
 
 Data in The BUF 7 is -----> 00 
 
 Data in The BUF 8 is -----> f8 
pl2303_mcm ttyUSB0: pl2303_write - length = 1, data = 02 
/home/teleset/Desktop/USB-Serial/pl2303_mcm.c: After the first urb submission count =  9
and length = 8 
pl2303_mcm ttyUSB0: pl2303_write - length = 8, data = 08 00 00 00 00 00 00 f8 
pl2303_mcm ttyUSB0: pl2303_write - failed submitting write urb, error -22
/home/teleset/Desktop/USB-Serial/pl2303_mcm.c: pl2303_write_bulk_callback - port 0
/home/teleset/Desktop/USB-Serial/pl2303_mcm.c: set_control_lines - value = 0, retval = 0

Kindly help me.

Raj.

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