ftdi_sio.c

/*
 * USB FTDI SIO driver
 *
 * 	Copyright (C) 1999 - 2001
 * 	    Greg Kroah-Hartman (greg@kroah.com)
 *          Bill Ryder (bryder@sgi.com)
 *	Copyright (C) 2002
 *	    Kuba Ober (kuba@mareimbrium.org)
 *
 * 	This program is free software; you can redistribute it and/or modify
 * 	it under the terms of the GNU General Public License as published by
 * 	the Free Software Foundation; either version 2 of the License, or
 * 	(at your option) any later version.
 *
 * See Documentation/usb/usb-serial.txt for more information on using this driver
 *
 * See http://ftdi-usb-sio.sourceforge.net for upto date testing info
 *	and extra documentation
 *
 * (21/Jul/2004) Ian Abbott
 *      Incorporated Steven Turner's code to add support for the FT2232C chip.
 *      The prelimilary port to the 2.6 kernel was by Rus V. Brushkoff.  I have
 *      fixed a couple of things.
 *
 * (27/May/2004) Ian Abbott
 *      Improved throttling code, mostly stolen from the WhiteHEAT driver.
 *
 * (26/Mar/2004) Jan Capek
 *      Added PID's for ICD-U20/ICD-U40 - incircuit PIC debuggers from CCS Inc.
 *
 * (09/Feb/2004) Ian Abbott
 *      Changed full name of USB-UIRT device to avoid "/" character.
 *      Added FTDI's alternate PID (0x6006) for FT232/245 devices.
 *      Added PID for "ELV USB Module UO100" from Stefan Frings.
 * 
 * (21/Oct/2003) Ian Abbott
 *      Renamed some VID/PID macros for Matrix Orbital and Perle Systems
 *      devices.  Removed Matrix Orbital and Perle Systems devices from the
 *      8U232AM device table, but left them in the FT232BM table, as they are
 *      known to use only FT232BM.
 *
 * (17/Oct/2003) Scott Allen
 *      Added vid/pid for Perle Systems UltraPort USB serial converters
 *
 * (21/Sep/2003) Ian Abbott
 *      Added VID/PID for Omnidirectional Control Technology US101 USB to
 *      RS-232 adapter (also rebadged as Dick Smith Electronics XH6381).
 *      VID/PID supplied by Donald Gordon.
 *
 * (19/Aug/2003) Ian Abbott
 *      Freed urb's transfer buffer in write bulk callback.
 *      Omitted some paranoid checks in write bulk callback that don't matter.
 *      Scheduled work in write bulk callback regardless of port's open count.
 *
 * (05/Aug/2003) Ian Abbott
 *      Added VID/PID for ID TECH IDT1221U USB to RS-232 adapter.
 *      VID/PID provided by Steve Briggs.
 *
 * (23/Jul/2003) Ian Abbott
 *      Added PIDs for CrystalFontz 547, 633, 631, 635, 640 and 640 from
 *      Wayne Wylupski.
 *
 * (10/Jul/2003) David Glance
 *      Added PID for DSS-20 SyncStation cradle for Sony-Ericsson P800.
 *
 * (27/Jun/2003) Ian Abbott
 *	Reworked the urb handling logic.  We have no more pool, but dynamically
 *	allocate the urb and the transfer buffer on the fly.  In testing this
 *	does not incure any measurable overhead.  This also relies on the fact
 *	that we have proper reference counting logic for urbs.  I nicked this
 *	from Greg KH's Visor driver.
 *      
 * (23/Jun/2003) Ian Abbott
 *      Reduced flip buffer pushes and corrected a data length test in
 *      ftdi_read_bulk_callback.
 *      Defererence pointers after any paranoid checks, not before.
 *
 * (21/Jun/2003) Erik Nygren
 *      Added support for Home Electronics Tira-1 IR tranceiver using FT232BM chip.
 *      See <http://www.home-electro.com/tira1.htm>.  Only operates properly 
 *      at 100000 and RTS-CTS, so set custom divisor mode on startup.
 *      Also force the Tira-1 and USB-UIRT to only use their custom baud rates.
 *
 * (18/Jun/2003) Ian Abbott
 *      Added Device ID of the USB relais from Rudolf Gugler (backported from
 *      Philipp Gühring's patch for 2.5.x kernel).
 *      Moved read transfer buffer reallocation into startup function.
 *      Free existing write urb and transfer buffer in startup function.
 *      Only use urbs in write urb pool that were successfully allocated.
 *      Moved some constant macros out of functions.
 *      Minor whitespace and comment changes.
 *
 * (12/Jun/2003) David Norwood
 *      Added support for USB-UIRT IR tranceiver using 8U232AM chip.
 *      See <http://home.earthlink.net/~jrhees/USBUIRT/index.htm>.  Only
 *      operates properly at 312500, so set custom divisor mode on startup.
 *
 * (12/Jun/2003) Ian Abbott
 *      Added Sealevel SeaLINK+ 210x, 220x, 240x, 280x vid/pids from Tuan Hoang
 *      - I've eliminated some that don't seem to exist!
 *      Added Home Electronics Tira-1 IR transceiver pid from Chris Horn
 *      Some whitespace/coding-style cleanups
 *
 * (11/Jun/2003) Ian Abbott
 *      Fixed unsafe spinlock usage in ftdi_write
 *
 * (24/Feb/2003) Richard Shooter
 *      Increase read buffer size to improve read speeds at higher baud rates
 *      (specifically tested with up to 1Mb/sec at 1.5M baud)
 *
 * (23/Feb/2003) John Wilkins
 *      Added Xon/xoff flow control (activating support in the ftdi device)
 *      Added vid/pid for Videonetworks/Homechoice (UK ISP)
 *
 * (23/Feb/2003) Bill Ryder
 *      Added matrix orb device vid/pids from Wayne Wylupski
 *
 * (19/Feb/2003) Ian Abbott
 *      For TIOCSSERIAL, set alt_speed to 0 when ASYNC_SPD_MASK value has
 *      changed to something other than ASYNC_SPD_HI, ASYNC_SPD_VHI,
 *      ASYNC_SPD_SHI or ASYNC_SPD_WARP.  Also, unless ASYNC_SPD_CUST is in
 *      force, don't bother changing baud rate when custom_divisor has changed.
 *
 * (18/Feb/2003) Ian Abbott
 *      Fixed TIOCMGET handling to include state of DTR and RTS, the state
 *      of which are now saved by set_dtr() and set_rts().
 *      Fixed improper storage class for buf in set_dtr() and set_rts().
 *      Added FT232BM chip type and support for its extra baud rates (compared
 *      to FT8U232AM).
 *      Took account of special case divisor values for highest baud rates of
 *      FT8U232AM and FT232BM.
 *      For TIOCSSERIAL, forced alt_speed to 0 when ASYNC_SPD_CUST kludge used,
 *      as previous alt_speed setting is now stale.
 *      Moved startup code common between the startup routines for the
 *      different chip types into a common subroutine.
 *
 * (17/Feb/2003) Bill Ryder
 *      Added write urb buffer pool on a per device basis
 *      Added more checking for open file on callbacks (fixed OOPS)
 *      Added CrystalFontz 632 and 634 PIDs 
 *         (thanx to CrystalFontz for the sample devices - they flushed out
 *           some driver bugs)
 *      Minor debugging message changes
 *      Added throttle, unthrottle and chars_in_buffer functions
 *      Fixed FTDI_SIO (the original device) bug
 *      Fixed some shutdown handling
 *      
 * 
 * 
 * 
 * (07/Jun/2002) Kuba Ober
 *	Changed FTDI_SIO_BASE_BAUD_TO_DIVISOR macro into ftdi_baud_to_divisor
 *	function. It was getting too complex.
 *	Fix the divisor calculation logic which was setting divisor of 0.125
 *	instead of 0.5 for fractional parts of divisor equal to 5/8, 6/8, 7/8.
 *	Also make it bump up the divisor to next integer in case of 7/8 - it's
 *	a better approximation.
 *
 * (25/Jul/2002) Bill Ryder inserted Dmitri's TIOCMIWAIT patch
 *      Not tested by me but it doesn't break anything I use.
 * 
 * (04/Jan/2002) Kuba Ober
 *	Implemented 38400 baudrate kludge, where it can be substituted with other
 *	  values. That's the only way to set custom baudrates.
 *	Implemented TIOCSSERIAL, TIOCGSERIAL ioctl's so that setserial is happy.
 *	FIXME: both baudrate things should eventually go to usbserial.c as other
 *	  devices may need that functionality too. Actually, it can probably be
 *	  merged in serial.c somehow - too many drivers repeat this code over
 *	  and over.
 *	Fixed baudrate forgetfulness - open() used to reset baudrate to 9600 every time.
 *	Divisors for baudrates are calculated by a macro.
 *	Small code cleanups. Ugly whitespace changes for Plato's sake only ;-].
 *
 * (04/Nov/2001) Bill Ryder
 *	Fixed bug in read_bulk_callback where incorrect urb buffer was used.
 *	Cleaned up write offset calculation
 *	Added write_room since default values can be incorrect for sio
 *	Changed write_bulk_callback to use same queue_task as other drivers
 *        (the previous version caused panics)
 *	Removed port iteration code since the device only has one I/O port and it
 *	  was wrong anyway.
 * 
 * (31/May/2001) gkh
 *	Switched from using spinlock to a semaphore, which fixes lots of problems.
 *
 * (23/May/2001)   Bill Ryder
 *	Added runtime debug patch (thanx Tyson D Sawyer).
 *	Cleaned up comments for 8U232
 *	Added parity, framing and overrun error handling
 *	Added receive break handling.
 * 
 * (04/08/2001) gb
 *	Identify version on module load.
 *       
 * (18/March/2001) Bill Ryder
 *	(Not released)
 *	Added send break handling. (requires kernel patch too)
 *	Fixed 8U232AM hardware RTS/CTS etc status reporting.
 *	Added flipbuf fix copied from generic device
 * 
 * (12/3/2000) Bill Ryder
 *	Added support for 8U232AM device.
 *	Moved PID and VIDs into header file only.
 *	Turned on low-latency for the tty (device will do high baudrates)
 *	Added shutdown routine to close files when device removed.
 *	More debug and error message cleanups.
 *
 * (11/13/2000) Bill Ryder
 *	Added spinlock protected open code and close code.
 *	Multiple opens work (sort of - see webpage mentioned above).
 *	Cleaned up comments. Removed multiple PID/VID definitions.
 *	Factorised cts/dtr code
 *	Made use of __FUNCTION__ in dbg's
 *      
 * (11/01/2000) Adam J. Richter
 *	usb_device_id table support
 * 
 * (10/05/2000) gkh
 *	Fixed bug with urb->dev not being set properly, now that the usb
 *	core needs it.
 * 
 * (09/11/2000) gkh
 *	Removed DEBUG #ifdefs with call to usb_serial_debug_data
 *
 * (07/19/2000) gkh
 *	Added module_init and module_exit functions to handle the fact that this
 *	driver is a loadable module now.
 *
 * (04/04/2000) Bill Ryder 
 *	Fixed bugs in TCGET/TCSET ioctls (by removing them - they are
 *        handled elsewhere in the tty io driver chain).
 *
 * (03/30/2000) Bill Ryder 
 *	Implemented lots of ioctls
 *	Fixed a race condition in write
 *	Changed some dbg's to errs
 *
 * (03/26/2000) gkh
 *	Split driver up into device specific pieces.
 *
 */

/* Bill Ryder - bryder@sgi.com - wrote the FTDI_SIO implementation */
/* Thanx to FTDI for so kindly providing details of the protocol required */
/*   to talk to the device */
/* Thanx to gkh and the rest of the usb dev group for all code I have assimilated :-) */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#include <linux/serial.h>
#include "usb-serial.h"
#include "ftdi_sio.h"

/*
 * Version Information
 */
#define DRIVER_VERSION "v1.4.1"
#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Bill Ryder <bryder@sgi.com>, Kuba Ober <kuba@mareimbrium.org>"
#define DRIVER_DESC "USB FTDI Serial Converters Driver"

static int debug;

static struct usb_device_id id_table_sio [] = {
	{ USB_DEVICE(FTDI_VID, FTDI_SIO_PID) },
	{ }						/* Terminating entry */
};

/*
 * The 8U232AM has the same API as the sio except for:
 * - it can support MUCH higher baudrates; up to:
 *   o 921600 for RS232 and 2000000 for RS422/485 at 48MHz
 *   o 230400 at 12MHz
 *   so .. 8U232AM's baudrate setting codes are different
 * - it has a two byte status code.
 * - it returns characters every 16ms (the FTDI does it every 40ms)
 *
 * the bcdDevice value is used to differentiate FT232BM and FT245BM from
 * the earlier FT8U232AM and FT8U232BM.  For now, include all known VID/PID
 * combinations in both tables.
 * FIXME: perhaps bcdDevice can also identify 12MHz devices, but I don't know
 * if those ever went into mass production. [Ian Abbott]
 */


static struct usb_device_id id_table_8U232AM [] = {
	{ USB_DEVICE_VER(FTDI_VID, FTDI_IRTRANS_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_8U232AM_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_8U232AM_ALT_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_RELAIS_PID, 0, 0x3ff) },
	{ USB_DEVICE(INTERBIOMETRICS_VID, INTERBIOMETRICS_IOBOARD_PID) },
	{ USB_DEVICE(INTERBIOMETRICS_VID, INTERBIOMETRICS_MINI_IOBOARD_PID) },
	{ USB_DEVICE_VER(FTDI_NF_RIC_VID, FTDI_NF_RIC_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_XF_632_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_XF_634_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_XF_547_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_XF_633_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_XF_631_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_XF_635_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_XF_640_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_XF_642_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_VNHCPCUSB_D_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_DSS20_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2101_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2102_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2103_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2104_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2201_1_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2201_2_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2202_1_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2202_2_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2203_1_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2203_2_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2401_1_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2401_2_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2401_3_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2401_4_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2402_1_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2402_2_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2402_3_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2402_4_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2403_1_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2403_2_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2403_3_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2403_4_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2801_1_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2801_2_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2801_3_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2801_4_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2801_5_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2801_6_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2801_7_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2801_8_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2802_1_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2802_2_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2802_3_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2802_4_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2802_5_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2802_6_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2802_7_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2802_8_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2803_1_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2803_2_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2803_3_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2803_4_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2803_5_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2803_6_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2803_7_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2803_8_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(IDTECH_VID, IDTECH_IDT1221U_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(OCT_VID, OCT_US101_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, PROTEGO_SPECIAL_1, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, PROTEGO_R2X0, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, PROTEGO_SPECIAL_3, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, PROTEGO_SPECIAL_4, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_ELV_UO100_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, INSIDE_ACCESSO, 0, 0x3ff) },
	{ USB_DEVICE_VER(INTREPID_VID, INTREPID_VALUECAN_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(INTREPID_VID, INTREPID_NEOVI_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(FALCOM_VID, FALCOM_TWIST_PID, 0, 0x3ff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_SUUNTO_SPORTS_PID, 0, 0x3ff) },
	{ }						/* Terminating entry */
};


static struct usb_device_id id_table_FT232BM [] = {
	{ USB_DEVICE_VER(FTDI_VID, FTDI_IRTRANS_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_8U232AM_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_8U232AM_ALT_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_RELAIS_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_NF_RIC_VID, FTDI_NF_RIC_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_XF_632_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_XF_634_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_XF_547_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_XF_633_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_XF_631_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_XF_635_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_XF_640_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_XF_642_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_VNHCPCUSB_D_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_DSS20_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_MTXORB_0_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_MTXORB_1_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_MTXORB_2_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_MTXORB_3_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_MTXORB_4_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_MTXORB_5_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_MTXORB_6_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_PERLE_ULTRAPORT_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_PIEGROUP_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2101_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2102_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2103_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2104_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2201_1_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2201_2_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2202_1_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2202_2_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2203_1_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2203_2_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2401_1_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2401_2_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2401_3_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2401_4_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2402_1_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2402_2_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2402_3_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2402_4_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2403_1_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2403_2_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2403_3_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2403_4_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2801_1_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2801_2_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2801_3_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2801_4_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2801_5_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2801_6_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2801_7_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2801_8_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2802_1_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2802_2_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2802_3_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2802_4_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2802_5_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2802_6_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2802_7_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2802_8_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2803_1_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2803_2_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2803_3_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2803_4_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2803_5_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2803_6_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2803_7_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(SEALEVEL_VID, SEALEVEL_2803_8_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(IDTECH_VID, IDTECH_IDT1221U_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(OCT_VID, OCT_US101_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, PROTEGO_SPECIAL_1, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, PROTEGO_R2X0, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, PROTEGO_SPECIAL_3, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, PROTEGO_SPECIAL_4, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_GUDEADS_E808_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_GUDEADS_E809_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_GUDEADS_E80A_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_GUDEADS_E80B_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_GUDEADS_E80C_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_GUDEADS_E80D_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_GUDEADS_E80E_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_GUDEADS_E80F_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_GUDEADS_E888_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_GUDEADS_E889_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_GUDEADS_E88A_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_GUDEADS_E88B_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_GUDEADS_E88C_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_GUDEADS_E88D_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_GUDEADS_E88E_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_GUDEADS_E88F_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_ELV_UO100_PID, 0x400, 0xffff) },
 	{ USB_DEVICE_VER(FTDI_VID, LINX_SDMUSBQSS_PID, 0x400, 0xffff) },
 	{ USB_DEVICE_VER(FTDI_VID, LINX_MASTERDEVEL2_PID, 0x400, 0xffff) },
 	{ USB_DEVICE_VER(FTDI_VID, LINX_FUTURE_0_PID, 0x400, 0xffff) },
 	{ USB_DEVICE_VER(FTDI_VID, LINX_FUTURE_1_PID, 0x400, 0xffff) },
 	{ USB_DEVICE_VER(FTDI_VID, LINX_FUTURE_2_PID, 0x400, 0xffff) },
	{ USB_DEVICE(FTDI_VID, FTDI_CCSICDU20_0_PID) },
	{ USB_DEVICE(FTDI_VID, FTDI_CCSICDU40_1_PID) },
	{ USB_DEVICE_VER(FTDI_VID, INSIDE_ACCESSO, 0x400, 0xffff) },
	{ USB_DEVICE_VER(INTREPID_VID, INTREPID_VALUECAN_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(INTREPID_VID, INTREPID_NEOVI_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FALCOM_VID, FALCOM_TWIST_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_SUUNTO_SPORTS_PID, 0x400, 0xffff) },
	{ }						/* Terminating entry */
};


static struct usb_device_id id_table_USB_UIRT [] = {
	{ USB_DEVICE(FTDI_VID, FTDI_USB_UIRT_PID) },
	{ }						/* Terminating entry */
};


static struct usb_device_id id_table_HE_TIRA1 [] = {
	{ USB_DEVICE_VER(FTDI_VID, FTDI_HE_TIRA1_PID, 0x400, 0xffff) },
	{ }						/* Terminating entry */
};


static struct usb_device_id id_table_FT2232C[] = {
	{ USB_DEVICE(FTDI_VID, FTDI_8U2232C_PID) },
	{ }						/* Terminating entry */
};


static struct usb_device_id id_table_combined [] = {
	{ USB_DEVICE(FTDI_VID, FTDI_IRTRANS_PID) },
	{ USB_DEVICE(FTDI_VID, FTDI_SIO_PID) },
	{ USB_DEVICE(FTDI_VID, FTDI_8U232AM_PID) },
	{ USB_DEVICE(FTDI_VID, FTDI_8U232AM_ALT_PID) },
	{ USB_DEVICE(FTDI_VID, FTDI_8U2232C_PID) },
	{ USB_DEVICE(FTDI_VID, FTDI_RELAIS_PID) },
	{ USB_DEVICE(INTERBIOMETRICS_VID, INTERBIOMETRICS_IOBOARD_PID) },
	{ USB_DEVICE(INTERBIOMETRICS_VID, INTERBIOMETRICS_MINI_IOBOARD_PID) },
	{ USB_DEVICE(FTDI_VID, FTDI_XF_632_PID) },
	{ USB_DEVICE(FTDI_VID, FTDI_XF_634_PID) },
	{ USB_DEVICE(FTDI_VID, FTDI_XF_547_PID) },
	{ USB_DEVICE(FTDI_VID, FTDI_XF_633_PID) },
	{ USB_DEVICE(FTDI_VID, FTDI_XF_631_PID) },
	{ USB_DEVICE(FTDI_VID, FTDI_XF_635_PID) },
	{ USB_DEVICE(FTDI_VID, FTDI_XF_640_PID) },
	{ USB_DEVICE(FTDI_VID, FTDI_XF_642_PID) },
	{ USB_DEVICE(FTDI_VID, FTDI_DSS20_PID) },
	{ USB_DEVICE(FTDI_NF_RIC_VID, FTDI_NF_RIC_PID) },
	{ USB_DEVICE(FTDI_VID, FTDI_VNHCPCUSB_D_PID) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_MTXORB_0_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_MTXORB_1_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_MTXORB_2_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_MTXORB_3_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_MTXORB_4_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_MTXORB_5_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_MTXORB_6_PID, 0x400, 0xffff) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_PERLE_ULTRAPORT_PID, 0x400, 0xffff) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2101_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2102_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2103_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2104_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2201_1_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2201_2_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2202_1_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2202_2_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2203_1_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2203_2_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_1_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_2_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_3_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_4_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_1_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_2_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_3_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_4_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_1_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_2_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_3_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_4_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_1_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_2_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_3_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_4_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_5_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_6_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_7_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_8_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_1_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_2_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_3_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_4_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_5_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_6_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_7_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_8_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_1_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_2_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_3_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_4_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_5_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_6_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_7_PID) },
	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_8_PID) },
	{ USB_DEVICE(IDTECH_VID, IDTECH_IDT1221U_PID) },
	{ USB_DEVICE(OCT_VID, OCT_US101_PID) },
	{ USB_DEVICE_VER(FTDI_VID, FTDI_HE_TIRA1_PID, 0x400, 0xffff) },
	{ USB_DEVICE(FTDI_VID, FTDI_USB_UIRT_PID) },
	{ USB_DEVICE(FTDI_VID, PROTEGO_SPECIAL_1) },
	{ USB_DEVICE(FTDI_VID, PROTEGO_R2X0) },
	{ USB_DEVICE(FTDI_VID, PROTEGO_SPECIAL_3) },
	{ USB_DEVICE(FTDI_VID, PROTEGO_SPECIAL_4) },
	{ USB_DEVICE(FTDI_VID, FTDI_ELV_UO100_PID) },
 	{ USB_DEVICE_VER(FTDI_VID, LINX_SDMUSBQSS_PID, 0x400, 0xffff) },
 	{ USB_DEVICE_VER(FTDI_VID, LINX_MASTERDEVEL2_PID, 0x400, 0xffff) },
 	{ USB_DEVICE_VER(FTDI_VID, LINX_FUTURE_0_PID, 0x400, 0xffff) },
 	{ USB_DEVICE_VER(FTDI_VID, LINX_FUTURE_1_PID, 0x400, 0xffff) },
 	{ USB_DEVICE_VER(FTDI_VID, LINX_FUTURE_2_PID, 0x400, 0xffff) },
 	{ USB_DEVICE(FTDI_VID, FTDI_CCSICDU20_0_PID) },
 	{ USB_DEVICE(FTDI_VID, FTDI_CCSICDU40_1_PID) },
	{ USB_DEVICE(FTDI_VID, INSIDE_ACCESSO) },
	{ USB_DEVICE(INTREPID_VID, INTREPID_VALUECAN_PID) },
	{ USB_DEVICE(INTREPID_VID, INTREPID_NEOVI_PID) },
	{ USB_DEVICE(FALCOM_VID, FALCOM_TWIST_PID) },
	{ USB_DEVICE(FTDI_VID, FTDI_SUUNTO_SPORTS_PID) },
	{ }						/* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, id_table_combined);

static struct usb_driver ftdi_driver = {
	.name =		"ftdi_sio",
	.probe =	usb_serial_probe,
	.disconnect =	usb_serial_disconnect,
	.id_table =	id_table_combined,
};


/* Constants for read urb and write urb */
#define BUFSZ 512
#define PKTSZ 64

/* rx_flags */
#define THROTTLED		0x01
#define ACTUALLY_THROTTLED	0x02

struct ftdi_private {
	ftdi_chip_type_t chip_type;
				/* type of the device, either SIO or FT8U232AM */
	int baud_base;		/* baud base clock for divisor setting */
	int custom_divisor;	/* custom_divisor kludge, this is for baud_base (different from what goes to the chip!) */
	__u16 last_set_data_urb_value ;
				/* the last data state set - needed for doing a break */
        int write_offset;       /* This is the offset in the usb data block to write the serial data - 
				 * it is different between devices
				 */
	int flags;		/* some ASYNC_xxxx flags are supported */
	unsigned long last_dtr_rts;	/* saved modem control outputs */
        wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
 	char prev_status, diff_status;        /* Used for TIOCMIWAIT */
	__u8 rx_flags;		/* receive state flags (throttling) */
	spinlock_t rx_lock;	/* spinlock for receive state */

	__u16 interface;	/* FT2232C port interface (0 for FT232/245) */

	int force_baud;		/* if non-zero, force the baud rate to this value */
	int force_rtscts;	/* if non-zero, force RTS-CTS to always be enabled */
};

/* Used for TIOCMIWAIT */
#define FTDI_STATUS_B0_MASK	(FTDI_RS0_CTS | FTDI_RS0_DSR | FTDI_RS0_RI | FTDI_RS0_RLSD)
#define FTDI_STATUS_B1_MASK	(FTDI_RS_BI)
/* End TIOCMIWAIT */

#define FTDI_IMPL_ASYNC_FLAGS = ( ASYNC_SPD_HI | ASYNC_SPD_VHI \
 ASYNC_SPD_CUST | ASYNC_SPD_SHI | ASYNC_SPD_WARP )

/* function prototypes for a FTDI serial converter */
static int  ftdi_SIO_startup		(struct usb_serial *serial);
static int  ftdi_8U232AM_startup	(struct usb_serial *serial);
static int  ftdi_FT232BM_startup	(struct usb_serial *serial);
static int  ftdi_FT2232C_startup	(struct usb_serial *serial);
static int  ftdi_USB_UIRT_startup	(struct usb_serial *serial);
static int  ftdi_HE_TIRA1_startup	(struct usb_serial *serial);
static void ftdi_shutdown		(struct usb_serial *serial);
static int  ftdi_open			(struct usb_serial_port *port, struct file *filp);
static void ftdi_close			(struct usb_serial_port *port, struct file *filp);
static int  ftdi_write			(struct usb_serial_port *port, int from_user, const unsigned char *buf, int count);
static int  ftdi_write_room		(struct usb_serial_port *port);
static int  ftdi_chars_in_buffer	(struct usb_serial_port *port);
static void ftdi_write_bulk_callback	(struct urb *urb, struct pt_regs *regs);
static void ftdi_read_bulk_callback	(struct urb *urb, struct pt_regs *regs);
static void ftdi_process_read		(struct usb_serial_port *port);
static void ftdi_set_termios		(struct usb_serial_port *port, struct termios * old);
static int  ftdi_tiocmget               (struct usb_serial_port *port, struct file *file);
static int  ftdi_tiocmset		(struct usb_serial_port *port, struct file * file, unsigned int set, unsigned int clear);
static int  ftdi_ioctl			(struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
static void ftdi_break_ctl		(struct usb_serial_port *port, int break_state );
static void ftdi_throttle		(struct usb_serial_port *port);
static void ftdi_unthrottle		(struct usb_serial_port *port);

static unsigned short int ftdi_232am_baud_base_to_divisor (int baud, int base);
static unsigned short int ftdi_232am_baud_to_divisor (int baud);
static __u32 ftdi_232bm_baud_base_to_divisor (int baud, int base);
static __u32 ftdi_232bm_baud_to_divisor (int baud);

static struct usb_serial_device_type ftdi_SIO_device = {
	.owner =		THIS_MODULE,
	.name =			"FTDI SIO",
	.id_table =		id_table_sio,
	.num_interrupt_in =	0,
	.num_bulk_in =		1,
	.num_bulk_out =		1,
	.num_ports =		1,
	.open =			ftdi_open,
	.close =		ftdi_close,
	.throttle =		ftdi_throttle,
	.unthrottle =		ftdi_unthrottle,
	.write =		ftdi_write,
	.write_room =		ftdi_write_room,
	.chars_in_buffer =	ftdi_chars_in_buffer,
	.read_bulk_callback =	ftdi_read_bulk_callback,
	.write_bulk_callback =	ftdi_write_bulk_callback,
	.tiocmget =             ftdi_tiocmget,
	.tiocmset =             ftdi_tiocmset,
	.ioctl =		ftdi_ioctl,
	.set_termios =		ftdi_set_termios,
	.break_ctl =		ftdi_break_ctl,
	.attach =		ftdi_SIO_startup,
	.shutdown =		ftdi_shutdown,
};

static struct usb_serial_device_type ftdi_8U232AM_device = {
	.owner =		THIS_MODULE,
	.name =			"FTDI 8U232AM Compatible",
	.id_table =		id_table_8U232AM,
	.num_interrupt_in =	0,
	.num_bulk_in =		1,
	.num_bulk_out =		1,
	.num_ports =		1,
	.open =			ftdi_open,
	.close =		ftdi_close,
	.throttle =		ftdi_throttle,
	.unthrottle =		ftdi_unthrottle,
	.write =		ftdi_write,
	.write_room =		ftdi_write_room,
	.chars_in_buffer =	ftdi_chars_in_buffer,
	.read_bulk_callback =	ftdi_read_bulk_callback,
	.write_bulk_callback =	ftdi_write_bulk_callback,
	.tiocmget =             ftdi_tiocmget,
	.tiocmset =             ftdi_tiocmset,
	.ioctl =		ftdi_ioctl,
	.set_termios =		ftdi_set_termios,
	.break_ctl =		ftdi_break_ctl,
	.attach =		ftdi_8U232AM_startup,
	.shutdown =		ftdi_shutdown,
};

static struct usb_serial_device_type ftdi_FT232BM_device = {
	.owner =		THIS_MODULE,
	.name =			"FTDI FT232BM Compatible",
	.id_table =		id_table_FT232BM,
	.num_interrupt_in =	0,
	.num_bulk_in =		1,
	.num_bulk_out =		1,
	.num_ports =		1,
	.open =			ftdi_open,
	.close =		ftdi_close,
	.throttle =		ftdi_throttle,
	.unthrottle =		ftdi_unthrottle,
	.write =		ftdi_write,
	.write_room =		ftdi_write_room,
	.chars_in_buffer =	ftdi_chars_in_buffer,
	.read_bulk_callback =	ftdi_read_bulk_callback,
	.write_bulk_callback =	ftdi_write_bulk_callback,
	.tiocmget =             ftdi_tiocmget,
	.tiocmset =             ftdi_tiocmset,
	.ioctl =		ftdi_ioctl,
	.set_termios =		ftdi_set_termios,
	.break_ctl =		ftdi_break_ctl,
	.attach =		ftdi_FT232BM_startup,
	.shutdown =		ftdi_shutdown,
};

static struct usb_serial_device_type ftdi_FT2232C_device = {
	.owner =		THIS_MODULE,
	.name =			"FTDI FT2232C Compatible",
	.id_table =		id_table_FT2232C,
	.num_interrupt_in =	0,
	.num_bulk_in =		1,
	.num_bulk_out =		1,
	.num_ports =		1,
	.open =			ftdi_open,
	.close =		ftdi_close,
	.throttle =		ftdi_throttle,
	.unthrottle =		ftdi_unthrottle,
	.write =		ftdi_write,
	.write_room =		ftdi_write_room,
	.chars_in_buffer =	ftdi_chars_in_buffer,
	.read_bulk_callback =	ftdi_read_bulk_callback,
	.write_bulk_callback =	ftdi_write_bulk_callback,
	.tiocmget =             ftdi_tiocmget,
	.tiocmset =             ftdi_tiocmset,
	.ioctl =		ftdi_ioctl,
	.set_termios =		ftdi_set_termios,
	.break_ctl =		ftdi_break_ctl,
	.attach =		ftdi_FT2232C_startup,
	.shutdown =		ftdi_shutdown,
};

static struct usb_serial_device_type ftdi_USB_UIRT_device = {
	.owner =		THIS_MODULE,
	.name =			"USB-UIRT Infrared Tranceiver",
	.id_table =		id_table_USB_UIRT,
	.num_interrupt_in =	0,
	.num_bulk_in =		1,
	.num_bulk_out =		1,
	.num_ports =		1,
	.open =			ftdi_open,
	.close =		ftdi_close,
	.throttle =		ftdi_throttle,
	.unthrottle =		ftdi_unthrottle,
	.write =		ftdi_write,
	.write_room =		ftdi_write_room,
	.chars_in_buffer =	ftdi_chars_in_buffer,
	.read_bulk_callback =	ftdi_read_bulk_callback,
	.write_bulk_callback =	ftdi_write_bulk_callback,
	.tiocmget =             ftdi_tiocmget,
	.tiocmset =             ftdi_tiocmset,
	.ioctl =		ftdi_ioctl,
	.set_termios =		ftdi_set_termios,
	.break_ctl =		ftdi_break_ctl,
	.attach =		ftdi_USB_UIRT_startup,
	.shutdown =		ftdi_shutdown,
};

/* The TIRA1 is based on a  FT232BM which requires a fixed baud rate of 100000
 * and which requires RTS-CTS to be enabled. */
static struct usb_serial_device_type ftdi_HE_TIRA1_device = {
	.owner =		THIS_MODULE,
	.name =			"Home-Electronics TIRA-1 IR Transceiver",
	.id_table =		id_table_HE_TIRA1,
	.num_interrupt_in =	0,
	.num_bulk_in =		1,
	.num_bulk_out =		1,
	.num_ports =		1,
	.open =			ftdi_open,
	.close =		ftdi_close,
	.throttle =		ftdi_throttle,
	.unthrottle =		ftdi_unthrottle,
	.write =		ftdi_write,
	.write_room =		ftdi_write_room,
	.chars_in_buffer =	ftdi_chars_in_buffer,
	.read_bulk_callback =	ftdi_read_bulk_callback,
	.write_bulk_callback =	ftdi_write_bulk_callback,
	.tiocmget =             ftdi_tiocmget,
	.tiocmset =             ftdi_tiocmset,
	.ioctl =		ftdi_ioctl,
	.set_termios =		ftdi_set_termios,
	.break_ctl =		ftdi_break_ctl,
	.attach =		ftdi_HE_TIRA1_startup,
	.shutdown =		ftdi_shutdown,
};



#define WDR_TIMEOUT (HZ * 5 ) /* default urb timeout */

/* High and low are for DTR, RTS etc etc */
#define HIGH 1
#define LOW 0

/*
 * ***************************************************************************
 * Utlity functions
 * ***************************************************************************
 */

static unsigned short int ftdi_232am_baud_base_to_divisor(int baud, int base)
{
	unsigned short int divisor;
	int divisor3 = base / 2 / baud; // divisor shifted 3 bits to the left
	if ((divisor3 & 0x7) == 7) divisor3 ++; // round x.7/8 up to x+1
	divisor = divisor3 >> 3;
	divisor3 &= 0x7;
	if (divisor3 == 1) divisor |= 0xc000; else // 0.125
	if (divisor3 >= 4) divisor |= 0x4000; else // 0.5
	if (divisor3 != 0) divisor |= 0x8000;      // 0.25
	if (divisor == 1) divisor = 0;	/* special case for maximum baud rate */
	return divisor;
}

static unsigned short int ftdi_232am_baud_to_divisor(int baud)
{
	 return(ftdi_232am_baud_base_to_divisor(baud, 48000000));
}

static __u32 ftdi_232bm_baud_base_to_divisor(int baud, int base)
{
	static const unsigned char divfrac[8] = { 0, 3, 2, 4, 1, 5, 6, 7 };
	__u32 divisor;
	int divisor3 = base / 2 / baud; // divisor shifted 3 bits to the left
	divisor = divisor3 >> 3;
	divisor |= (__u32)divfrac[divisor3 & 0x7] << 14;
	/* Deal with special cases for highest baud rates. */
	if (divisor == 1) divisor = 0; else	// 1.0
	if (divisor == 0x4001) divisor = 1;	// 1.5
	return divisor;
}

static __u32 ftdi_232bm_baud_to_divisor(int baud)
{
	 return(ftdi_232bm_baud_base_to_divisor(baud, 48000000));
}

static int set_rts(struct usb_serial_port *port, int high_or_low)
{
	struct ftdi_private *priv = usb_get_serial_port_data(port);
	char *buf;
	unsigned ftdi_high_or_low;
	int rv;
	
	buf = kmalloc(1, GFP_NOIO);
	if (!buf)
		return -ENOMEM;
	
	if (high_or_low) {
		ftdi_high_or_low = FTDI_SIO_SET_RTS_HIGH;
		priv->last_dtr_rts |= TIOCM_RTS;
	} else {
		ftdi_high_or_low = FTDI_SIO_SET_RTS_LOW;
		priv->last_dtr_rts &= ~TIOCM_RTS;
	}
	rv = usb_control_msg(port->serial->dev,
			       usb_sndctrlpipe(port->serial->dev, 0),
			       FTDI_SIO_SET_MODEM_CTRL_REQUEST, 
			       FTDI_SIO_SET_MODEM_CTRL_REQUEST_TYPE,
			       ftdi_high_or_low, priv->interface, 
			       buf, 0, WDR_TIMEOUT);

	kfree(buf);
	return rv;
}


static int set_dtr(struct usb_serial_port *port, int high_or_low)
{
	struct ftdi_private *priv = usb_get_serial_port_data(port);
	char *buf;
	unsigned ftdi_high_or_low;
	int rv;
	
	buf = kmalloc(1, GFP_NOIO);
	if (!buf)
		return -ENOMEM;

	if (high_or_low) {
		ftdi_high_or_low = FTDI_SIO_SET_DTR_HIGH;
		priv->last_dtr_rts |= TIOCM_DTR;
	} else {
		ftdi_high_or_low = FTDI_SIO_SET_DTR_LOW;
		priv->last_dtr_rts &= ~TIOCM_DTR;
	}
	rv = usb_control_msg(port->serial->dev,
			       usb_sndctrlpipe(port->serial->dev, 0),
			       FTDI_SIO_SET_MODEM_CTRL_REQUEST, 
			       FTDI_SIO_SET_MODEM_CTRL_REQUEST_TYPE,
			       ftdi_high_or_low, priv->interface, 
			       buf, 0, WDR_TIMEOUT);

	kfree(buf);
	return rv;
}


static __u32 get_ftdi_divisor(struct usb_serial_port * port);


static int change_speed(struct usb_serial_port *port)
{
	struct ftdi_private *priv = usb_get_serial_port_data(port);
	char *buf;
        __u16 urb_value;
	__u16 urb_index;
	__u32 urb_index_value;
	int rv;

	buf = kmalloc(1, GFP_NOIO);
	if (!buf)
		return -ENOMEM;

	urb_index_value = get_ftdi_divisor(port);
	urb_value = (__u16)urb_index_value;
	urb_index = (__u16)(urb_index_value >> 16);
	if (priv->interface) {	/* FT2232C */
		urb_index = (__u16)((urb_index << 8) | priv->interface);
	}
	
	rv = usb_control_msg(port->serial->dev,
			    usb_sndctrlpipe(port->serial->dev, 0),
			    FTDI_SIO_SET_BAUDRATE_REQUEST,
			    FTDI_SIO_SET_BAUDRATE_REQUEST_TYPE,
			    urb_value, urb_index,
			    buf, 0, 100);

	kfree(buf);
	return rv;
}


static __u32 get_ftdi_divisor(struct usb_serial_port * port)
{ /* get_ftdi_divisor */
	struct ftdi_private *priv = usb_get_serial_port_data(port);
	__u32 div_value = 0;
	int div_okay = 1;
	char *chip_name = "";
	int baud;

	/*
	 * The logic involved in setting the baudrate can be cleanly split in 3 steps.
	 * Obtaining the actual baud rate is a little tricky since unix traditionally
	 * somehow ignored the possibility to set non-standard baud rates.
	 * 1. Standard baud rates are set in tty->termios->c_cflag
	 * 2. If these are not enough, you can set any speed using alt_speed as follows:
	 *    - set tty->termios->c_cflag speed to B38400
	 *    - set your real speed in tty->alt_speed; it gets ignored when
	 *      alt_speed==0, (or)
	 *    - call TIOCSSERIAL ioctl with (struct serial_struct) set as follows:
	 *      flags & ASYNC_SPD_MASK == ASYNC_SPD_[HI, VHI, SHI, WARP], this just
	 *      sets alt_speed to (HI: 57600, VHI: 115200, SHI: 230400, WARP: 460800)
	 * ** Steps 1, 2 are done courtesy of tty_get_baud_rate
	 * 3. You can also set baud rate by setting custom divisor as follows
	 *    - set tty->termios->c_cflag speed to B38400
	 *    - call TIOCSSERIAL ioctl with (struct serial_struct) set as follows:
	 *      o flags & ASYNC_SPD_MASK == ASYNC_SPD_CUST
	 *      o custom_divisor set to baud_base / your_new_baudrate
	 * ** Step 3 is done courtesy of code borrowed from serial.c - I should really
	 *    spend some time and separate+move this common code to serial.c, it is
	 *    replicated in nearly every serial driver you see.
	 */

	/* 1. Get the baud rate from the tty settings, this observes alt_speed hack */

	baud = tty_get_baud_rate(port->tty);
	dbg("%s - tty_get_baud_rate reports speed %d", __FUNCTION__, baud);

	/* 2. Observe async-compatible custom_divisor hack, update baudrate if needed */

	if (baud == 38400 &&
	    ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) &&
	     (priv->custom_divisor)) {
		baud = priv->baud_base / priv->custom_divisor;
		dbg("%s - custom divisor %d sets baud rate to %d", __FUNCTION__, priv->custom_divisor, baud);
	}

	/* 3. Convert baudrate to device-specific divisor */

	if (!baud) baud = 9600;	
	switch(priv->chip_type) {
	case SIO: /* SIO chip */
		chip_name = "SIO";
		switch(baud) {
		case 300: div_value = ftdi_sio_b300; break;
		case 600: div_value = ftdi_sio_b600; break;
		case 1200: div_value = ftdi_sio_b1200; break;
		case 2400: div_value = ftdi_sio_b2400; break;
		case 4800: div_value = ftdi_sio_b4800; break;
		case 9600: div_value = ftdi_sio_b9600; break;
		case 19200: div_value = ftdi_sio_b19200; break;
		case 38400: div_value = ftdi_sio_b38400; break;
		case 57600: div_value = ftdi_sio_b57600;  break;
		case 115200: div_value = ftdi_sio_b115200; break;
		} /* baud */
		if (div_value == 0) {
  			dbg("%s - Baudrate (%d) requested is not supported", __FUNCTION__,  baud);
			div_value = ftdi_sio_b9600;
			div_okay = 0;
		}
		break;
	case FT8U232AM: /* 8U232AM chip */
		chip_name = "FT8U232AM";
		if (baud <= 3000000) {
			div_value = ftdi_232am_baud_to_divisor(baud);
		} else {
	                dbg("%s - Baud rate too high!", __FUNCTION__);
			div_value = ftdi_232am_baud_to_divisor(9600);
			div_okay = 0;
		}
		break;
	case FT232BM: /* FT232BM chip */
	case FT2232C: /* FT2232C chip */
		if (priv->chip_type == FT2232C) {
			chip_name = "FT2232C";
		} else {
			chip_name = "FT232BM";
		}
		if (baud <= 3000000) {
			div_value = ftdi_232bm_baud_to_divisor(baud);
		} else {
	                dbg("%s - Baud rate too high!", __FUNCTION__);
			div_value = ftdi_232bm_baud_to_divisor(9600);
			div_okay = 0;
		}
		break;
	} /* priv->chip_type */

	if (div_okay) {
		dbg("%s - Baud rate set to %d (divisor 0x%lX) on chip %s",
			__FUNCTION__, baud, (unsigned long)div_value, chip_name);
	}

	return(div_value);
}


static int get_serial_info(struct usb_serial_port * port, struct serial_struct __user * retinfo)
{
	struct ftdi_private *priv = usb_get_serial_port_data(port);
	struct serial_struct tmp;

	if (!retinfo)
		return -EFAULT;
	memset(&tmp, 0, sizeof(tmp));
	tmp.flags = priv->flags;
	tmp.baud_base = priv->baud_base;
	tmp.custom_divisor = priv->custom_divisor;
	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
		return -EFAULT;
	return 0;
} /* get_serial_info */


static int set_serial_info(struct usb_serial_port * port, struct serial_struct __user * newinfo)
{ /* set_serial_info */
	struct ftdi_private *priv = usb_get_serial_port_data(port);
	struct serial_struct new_serial;
	struct ftdi_private old_priv;

	if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
		return -EFAULT;
	old_priv = * priv;

	/* Do error checking and permission checking */

	if (!capable(CAP_SYS_ADMIN)) {
		if (((new_serial.flags & ~ASYNC_USR_MASK) !=
		     (priv->flags & ~ASYNC_USR_MASK)))
			return -EPERM;
		priv->flags = ((priv->flags & ~ASYNC_USR_MASK) |
			       (new_serial.flags & ASYNC_USR_MASK));
		priv->custom_divisor = new_serial.custom_divisor;
		goto check_and_exit;
	}

	if ((new_serial.baud_base != priv->baud_base) ||
	    (new_serial.baud_base < 9600))
		return -EINVAL;

	/* Make the changes - these are privileged changes! */

	priv->flags = ((priv->flags & ~ASYNC_FLAGS) |
	               (new_serial.flags & ASYNC_FLAGS));	
	priv->custom_divisor = new_serial.custom_divisor;

	port->tty->low_latency = (priv->flags & ASYNC_LOW_LATENCY) ? 1 : 0;

check_and_exit:
	if ((old_priv.flags & ASYNC_SPD_MASK) !=
	     (priv->flags & ASYNC_SPD_MASK)) {
		if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
			port->tty->alt_speed = 57600;
		else if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
			port->tty->alt_speed = 115200;
		else if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
			port->tty->alt_speed = 230400;
		else if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
			port->tty->alt_speed = 460800;
		else
			port->tty->alt_speed = 0;
	}
	if (((old_priv.flags & ASYNC_SPD_MASK) !=
	     (priv->flags & ASYNC_SPD_MASK)) ||
	    (((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) &&
	     (old_priv.custom_divisor != priv->custom_divisor))) {
		change_speed(port);
	}
	
	return (0);

} /* set_serial_info */

/*
 * ***************************************************************************
 * FTDI driver specific functions
 * ***************************************************************************
 */

/* Common startup subroutine */
/* Called from ftdi_SIO_startup, etc. */
static int ftdi_common_startup (struct usb_serial *serial)
{
	struct usb_serial_port *port = serial->port[0];
	struct ftdi_private *priv;
	
	dbg("%s",__FUNCTION__);

	priv = kmalloc(sizeof(struct ftdi_private), GFP_KERNEL);
	if (!priv){
		err("%s- kmalloc(%Zd) failed.", __FUNCTION__, sizeof(struct ftdi_private));
		return -ENOMEM;
	}
	memset(priv, 0, sizeof(*priv));

	spin_lock_init(&priv->rx_lock);
        init_waitqueue_head(&priv->delta_msr_wait);
	/* This will push the characters through immediately rather
	   than queue a task to deliver them */
	priv->flags = ASYNC_LOW_LATENCY;

	/* Increase the size of read buffers */
	if (port->bulk_in_buffer) {
		kfree (port->bulk_in_buffer);
	}
	port->bulk_in_buffer = kmalloc (BUFSZ, GFP_KERNEL);
	if (!port->bulk_in_buffer) {
		kfree (priv);
		return -ENOMEM;
	}
	if (port->read_urb) {
		port->read_urb->transfer_buffer = port->bulk_in_buffer;
		port->read_urb->transfer_buffer_length = BUFSZ;
	}

	/* Free port's existing write urb and transfer buffer. */
	if (port->write_urb) {
		usb_free_urb (port->write_urb);
		port->write_urb = NULL;
	}
	if (port->bulk_out_buffer) {
		kfree (port->bulk_out_buffer);
		port->bulk_out_buffer = NULL;
	}

	usb_set_serial_port_data(serial->port[0], priv);
	
	return (0);
}


/* Startup for the SIO chip */
/* Called from usbserial:serial_probe */
static int ftdi_SIO_startup (struct usb_serial *serial)
{
	struct ftdi_private *priv;
	int err;

	dbg("%s",__FUNCTION__);

	err = ftdi_common_startup(serial);
	if (err){
		return (err);
	}

	priv = usb_get_serial_port_data(serial->port[0]);
	priv->chip_type = SIO;
	priv->baud_base = 12000000 / 16;
	priv->write_offset = 1;
	
	return (0);
}

/* Startup for the 8U232AM chip */
/* Called from usbserial:serial_probe */
static int ftdi_8U232AM_startup (struct usb_serial *serial)
{ /* ftdi_8U232AM_startup */
	struct ftdi_private *priv;
	int err;

	dbg("%s",__FUNCTION__);
	err = ftdi_common_startup(serial);
	if (err){
		return (err);
	}

	priv = usb_get_serial_port_data(serial->port[0]);
	priv->chip_type = FT8U232AM;
	priv->baud_base = 48000000 / 2; /* Would be / 16, but FTDI supports 0.125, 0.25 and 0.5 divisor fractions! */
	
	return (0);
} /* ftdi_8U232AM_startup */

/* Startup for the FT232BM chip */
/* Called from usbserial:serial_probe */
static int ftdi_FT232BM_startup (struct usb_serial *serial)
{ /* ftdi_FT232BM_startup */
	struct ftdi_private *priv;
	int err;

	dbg("%s",__FUNCTION__);
	err = ftdi_common_startup(serial);
	if (err){
		return (err);
	}

	priv = usb_get_serial_port_data(serial->port[0]);
	priv->chip_type = FT232BM;
	priv->baud_base = 48000000 / 2; /* Would be / 16, but FT232BM supports multiple of 0.125 divisor fractions! */
	
	return (0);
} /* ftdi_FT232BM_startup */

/* Startup for the FT2232C chip */
/* Called from usbserial:serial_probe */
static int ftdi_FT2232C_startup (struct usb_serial *serial)
{ /* ftdi_FT2232C_startup */
	struct ftdi_private *priv;
	int err;
	int inter;

	dbg("%s",__FUNCTION__);
	err = ftdi_common_startup(serial);
	if (err){
		return (err);
	}

	priv = usb_get_serial_port_data(serial->port[0]);
	priv->chip_type = FT2232C;
	inter = serial->interface->altsetting->desc.bInterfaceNumber;

	if (inter) {
		priv->interface = INTERFACE_B;
	}
	else  {
		priv->interface = INTERFACE_A;
	}
	priv->baud_base = 48000000 / 2; /* Would be / 16, but FT2232C supports multiple of 0.125 divisor fractions! */
	
	return (0);
} /* ftdi_FT2232C_startup */

/* Startup for the USB-UIRT device, which requires hardwired baudrate (38400 gets mapped to 312500) */
/* Called from usbserial:serial_probe */
static int ftdi_USB_UIRT_startup (struct usb_serial *serial)
{ /* ftdi_USB_UIRT_startup */
	struct ftdi_private *priv;
	int err;

	dbg("%s",__FUNCTION__);
	err = ftdi_8U232AM_startup(serial);
	if (err){
		return (err);
	}

	priv = usb_get_serial_port_data(serial->port[0]);
	priv->flags |= ASYNC_SPD_CUST;
	priv->custom_divisor = 77;
	priv->force_baud = B38400;
	
	return (0);
} /* ftdi_USB_UIRT_startup */

/* Startup for the HE-TIRA1 device, which requires hardwired
 * baudrate (38400 gets mapped to 100000) */
static int ftdi_HE_TIRA1_startup (struct usb_serial *serial)
{ /* ftdi_HE_TIRA1_startup */
	struct ftdi_private *priv;
	int err;

	dbg("%s",__FUNCTION__);
	err = ftdi_FT232BM_startup(serial);
	if (err){
		return (err);
	}

	priv = usb_get_serial_port_data(serial->port[0]);
	priv->flags |= ASYNC_SPD_CUST;
	priv->custom_divisor = 240;
	priv->force_baud = B38400;
	priv->force_rtscts = 1;
	
	return (0);
} /* ftdi_HE_TIRA1_startup */


/* ftdi_shutdown is called from usbserial:usb_serial_disconnect 
 *   it is called when the usb device is disconnected
 *
 *   usbserial:usb_serial_disconnect
 *      calls __serial_close for each open of the port
 *      shutdown is called then (ie ftdi_shutdown)
 */


static void ftdi_shutdown (struct usb_serial *serial)
{ /* ftdi_shutdown */
	
	struct usb_serial_port *port = serial->port[0];
	struct ftdi_private *priv = usb_get_serial_port_data(port);

	dbg("%s", __FUNCTION__);

	/* all open ports are closed at this point 
         *    (by usbserial.c:__serial_close, which calls ftdi_close)  
	 */

	if (priv) {
		usb_set_serial_port_data(port, NULL);
		kfree(priv);
	}
} /* ftdi_shutdown */


static int  ftdi_open (struct usb_serial_port *port, struct file *filp)
{ /* ftdi_open */
	struct termios tmp_termios;
	struct usb_device *dev = port->serial->dev;
	struct ftdi_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	
	int result = 0;
	char buf[1]; /* Needed for the usb_control_msg I think */

	dbg("%s", __FUNCTION__);


	port->tty->low_latency = (priv->flags & ASYNC_LOW_LATENCY) ? 1 : 0;

	/* No error checking for this (will get errors later anyway) */
	/* See ftdi_sio.h for description of what is reset */
	usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
			FTDI_SIO_RESET_REQUEST, FTDI_SIO_RESET_REQUEST_TYPE, 
			FTDI_SIO_RESET_SIO, 
			priv->interface, buf, 0, WDR_TIMEOUT);

	/* Termios defaults are set by usb_serial_init. We don't change
	   port->tty->termios - this would loose speed settings, etc.
	   This is same behaviour as serial.c/rs_open() - Kuba */

	/* ftdi_set_termios  will send usb control messages */
	ftdi_set_termios(port, &tmp_termios);

	/* FIXME: Flow control might be enabled, so it should be checked -
	   we have no control of defaults! */
	/* Turn on RTS and DTR since we are not flow controlling by default */
	if (set_dtr(port, HIGH) < 0) {
		err("%s Error from DTR HIGH urb", __FUNCTION__);
	}
	if (set_rts(port, HIGH) < 0){
		err("%s Error from RTS HIGH urb", __FUNCTION__);
	}

	/* Not throttled */
	spin_lock_irqsave(&priv->rx_lock, flags);
	priv->rx_flags &= ~(THROTTLED | ACTUALLY_THROTTLED);
	spin_unlock_irqrestore(&priv->rx_lock, flags);

	/* Start reading from the device */
	usb_fill_bulk_urb(port->read_urb, dev,
		      usb_rcvbulkpipe(dev, port->bulk_in_endpointAddress),
		      port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length,
		      ftdi_read_bulk_callback, port);
	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
	if (result)
		err("%s - failed submitting read urb, error %d", __FUNCTION__, result);


	return result;
} /* ftdi_open */



/* 
 * usbserial:__serial_close  only calls ftdi_close if the point is open
 *
 *   This only gets called when it is the last close
 *   
 *   
 */

static void ftdi_close (struct usb_serial_port *port, struct file *filp)
{ /* ftdi_close */
	unsigned int c_cflag = port->tty->termios->c_cflag;
	struct ftdi_private *priv = usb_get_serial_port_data(port);
	char buf[1];

	dbg("%s", __FUNCTION__);

	if (c_cflag & HUPCL){
		/* Disable flow control */
		if (usb_control_msg(port->serial->dev, 
				    usb_sndctrlpipe(port->serial->dev, 0),
				    FTDI_SIO_SET_FLOW_CTRL_REQUEST,
				    FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
				    0, priv->interface, buf, 0,
				    WDR_TIMEOUT) < 0) {
			err("error from flowcontrol urb");
		}	    

		/* drop DTR */
		if (set_dtr(port, LOW) < 0){
			err("Error from DTR LOW urb");
		}
		/* drop RTS */
		if (set_rts(port, LOW) < 0) {
			err("Error from RTS LOW urb");
		}
	} /* Note change no line if hupcl is off */
	
	/* shutdown our bulk read */
	if (port->read_urb) {
		if (usb_unlink_urb (port->read_urb) < 0) {
			/* Generally, this isn't an error.  If the previous
			   read bulk callback occurred (or is about to occur)
			   while the port was being closed or was throtted
			   (and is still throttled), the read urb will not
			   have been submitted. */
			dbg("%s - failed to unlink read urb (generally not an error)", __FUNCTION__);
		}
	}
} /* ftdi_close */


  
/* The SIO requires the first byte to have:
 *  B0 1
 *  B1 0
 *  B2..7 length of message excluding byte 0
 *
 * The new devices do not require this byte
 */
static int ftdi_write (struct usb_serial_port *port, int from_user,
			   const unsigned char *buf, int count)
{ /* ftdi_write */
	struct ftdi_private *priv = usb_get_serial_port_data(port);
	struct urb *urb;
	unsigned char *buffer;
	int data_offset ;       /* will be 1 for the SIO and 0 otherwise */
	int status;
	int transfer_size;

	dbg("%s port %d, %d bytes", __FUNCTION__, port->number, count);

	if (count == 0) {
		err("write request of 0 bytes");
		return 0;
	}
	
	data_offset = priv->write_offset;
        dbg("data_offset set to %d",data_offset);

	/* Determine total transfer size */
	transfer_size = count;
	if (data_offset > 0) {
		/* Original sio needs control bytes too... */
		transfer_size += (data_offset *
				((count + (PKTSZ - 1 - data_offset)) /
				 (PKTSZ - data_offset)));
	}

	buffer = kmalloc (transfer_size, GFP_ATOMIC);
	if (!buffer) {
		err("%s ran out of kernel memory for urb ...", __FUNCTION__);
		return -ENOMEM;
	}

	urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!urb) {
		err("%s - no more free urbs", __FUNCTION__);
		kfree (buffer);
		return -ENOMEM;
	}

	/* Copy data */
	if (data_offset > 0) {
		/* Original sio requires control byte at start of each packet. */
		int user_pktsz = PKTSZ - data_offset;
		int todo = count;
		unsigned char *first_byte = buffer;
		const unsigned char *current_position = buf;

		while (todo > 0) {
			if (user_pktsz > todo) {
				user_pktsz = todo;
			}
			/* Write the control byte at the front of the packet*/
			*first_byte = 1 | ((user_pktsz) << 2); 
			/* Copy data for packet */
			if (from_user) {
				if (copy_from_user (first_byte + data_offset,
						    current_position, user_pktsz)){
					kfree (buffer);
					usb_free_urb (urb);
					return -EFAULT;
				}
			} else {
				memcpy (first_byte + data_offset,
					current_position, user_pktsz);
			}
			first_byte += user_pktsz + data_offset;
			current_position += user_pktsz;
			todo -= user_pktsz;
		}
	} else {
		/* No control byte required. */
		/* Copy in the data to send */
		if (from_user) {
			if (copy_from_user (buffer, buf, count)) {
				kfree (buffer);
				usb_free_urb (urb);
				return -EFAULT;
			}
		} else {
			memcpy (buffer, buf, count);
		}
	}

	usb_serial_debug_data(debug, &port->dev, __FUNCTION__, transfer_size, buffer);

	/* fill the buffer and send it */
	usb_fill_bulk_urb(urb, port->serial->dev, 
		      usb_sndbulkpipe(port->serial->dev, port->bulk_out_endpointAddress),
		      buffer, transfer_size,
		      ftdi_write_bulk_callback, port);

	status = usb_submit_urb(urb, GFP_ATOMIC);
	if (status) {
		err("%s - failed submitting write urb, error %d", __FUNCTION__, status);
		count = status;
		kfree (buffer);
	}

	/* we are done with this urb, so let the host driver
	 * really free it when it is finished with it */
	usb_free_urb (urb);

	dbg("%s write returning: %d", __FUNCTION__, count);
	return count;
} /* ftdi_write */


/* This function may get called when the device is closed */

static void ftdi_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
{
	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;

	/* free up the transfer buffer, as usb_free_urb() does not do this */
	kfree (urb->transfer_buffer);

	dbg("%s - port %d", __FUNCTION__, port->number);
	
	if (urb->status) {
		dbg("nonzero write bulk status received: %d", urb->status);
		return;
	}

	schedule_work(&port->work);
} /* ftdi_write_bulk_callback */


static int ftdi_write_room( struct usb_serial_port *port )
{
	dbg("%s - port %d", __FUNCTION__, port->number);

	/*
	 * We really can take anything the user throws at us
	 * but let's pick a nice big number to tell the tty
	 * layer that we have lots of free space
	 */
	return 2048;
} /* ftdi_write_room */


static int ftdi_chars_in_buffer (struct usb_serial_port *port)
{ /* ftdi_chars_in_buffer */
	dbg("%s - port %d", __FUNCTION__, port->number);

	/* 
	 * We can't really account for how much data we
	 * have sent out, but hasn't made it through to the
	 * device, so just tell the tty layer that everything
	 * is flushed.
	 */
	return 0;
} /* ftdi_chars_in_buffer */



static void ftdi_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
{ /* ftdi_read_bulk_callback */
	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
	struct tty_struct *tty;
	struct ftdi_private *priv;

	if (urb->number_of_packets > 0) {
		err("%s transfer_buffer_length %d actual_length %d number of packets %d",__FUNCTION__,
		    urb->transfer_buffer_length, urb->actual_length, urb->number_of_packets );
		err("%s transfer_flags %x ", __FUNCTION__,urb->transfer_flags );
	}

	dbg("%s - port %d", __FUNCTION__, port->number);

	if (port->open_count <= 0)
		return;

	tty = port->tty;
	if (!tty) {
		dbg("%s - bad tty pointer - exiting",__FUNCTION__);
		return;
	}

	priv = usb_get_serial_port_data(port);
	if (!priv) {
		dbg("%s - bad port private data pointer - exiting", __FUNCTION__);
		return;
	}

	if (urb != port->read_urb) {
		err("%s - Not my urb!", __FUNCTION__);
	}

	if (urb->status) {
		/* This will happen at close every time so it is a dbg not an err */
		dbg("(this is ok on close) nonzero read bulk status received: %d", urb->status);
		return;
	}

	/* If throttled, delay receive processing until unthrottled. */
	spin_lock(&priv->rx_lock);
	if (priv->rx_flags & THROTTLED) {
		dbg("Deferring read urb processing until unthrottled");
		priv->rx_flags |= ACTUALLY_THROTTLED;
		spin_unlock(&priv->rx_lock);
		return;
	}
	spin_unlock(&priv->rx_lock);

	ftdi_process_read(port);

} /* ftdi_read_bulk_callback */


static void ftdi_process_read (struct usb_serial_port *port)
{ /* ftdi_process_read */
	struct urb *urb;
	struct tty_struct *tty;
	struct ftdi_private *priv;
	char error_flag;
       	unsigned char *data;

	int i;
	int result;
	int need_flip;
	int packet_offset;

	dbg("%s - port %d", __FUNCTION__, port->number);

	if (port->open_count <= 0)
		return;

	tty = port->tty;
	if (!tty) {
		dbg("%s - bad tty pointer - exiting",__FUNCTION__);
		return;
	}

	priv = usb_get_serial_port_data(port);
	if (!priv) {
		dbg("%s - bad port private data pointer - exiting", __FUNCTION__);
		return;
	}

	urb = port->read_urb;
	if (!urb) {
		dbg("%s - bad read_urb pointer - exiting", __FUNCTION__);
		return;
	}

	data = urb->transfer_buffer;

        /* The first two bytes of every read packet are status */
	if (urb->actual_length > 2) {
		usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
	} else {
                dbg("Status only: %03oo %03oo",data[0],data[1]);
        }


	/* TO DO -- check for hung up line and handle appropriately: */
	/*   send hangup  */
	/* See acm.c - you do a tty_hangup  - eg tty_hangup(tty) */
	/* if CD is dropped and the line is not CLOCAL then we should hangup */

	need_flip = 0;
	for (packet_offset=0; packet_offset < urb->actual_length; packet_offset += PKTSZ) {
		/* Compare new line status to the old one, signal if different */
		if (priv != NULL) {
			char new_status = data[packet_offset+0] & FTDI_STATUS_B0_MASK;
			if (new_status != priv->prev_status) {
				priv->diff_status |= new_status ^ priv->prev_status;
				wake_up_interruptible(&priv->delta_msr_wait);
				priv->prev_status = new_status;
			}
		}

		/* Handle errors and break */
		error_flag = TTY_NORMAL;
		/* Although the device uses a bitmask and hence can have multiple */
		/* errors on a packet - the order here sets the priority the */
		/* error is returned to the tty layer  */

		if ( data[packet_offset+1] & FTDI_RS_OE ) {
			error_flag = TTY_OVERRUN;
			dbg("OVERRRUN error");
		}
		if ( data[packet_offset+1] & FTDI_RS_BI ) {
			error_flag = TTY_BREAK;
			dbg("BREAK received");
		}
		if ( data[packet_offset+1] & FTDI_RS_PE ) {
			error_flag = TTY_PARITY;
			dbg("PARITY error");
		}
		if ( data[packet_offset+1] & FTDI_RS_FE ) {
			error_flag = TTY_FRAME;
			dbg("FRAMING error");
		}
		if (urb->actual_length > packet_offset + 2) {
			for (i = 2; (i < PKTSZ) && ((i+packet_offset) < urb->actual_length); ++i) {
				/* have to make sure we don't overflow the buffer
				  with tty_insert_flip_char's */
				if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
					tty_flip_buffer_push(tty);
				}
				/* Note that the error flag is duplicated for 
				   every character received since we don't know
				   which character it applied to */
				tty_insert_flip_char(tty, data[packet_offset+i], error_flag);
			}
			need_flip = 1;
		}

#ifdef NOT_CORRECT_BUT_KEEPING_IT_FOR_NOW
		/* if a parity error is detected you get status packets forever
		   until a character is sent without a parity error.
		   This doesn't work well since the application receives a never
		   ending stream of bad data - even though new data hasn't been sent.
		   Therefore I (bill) have taken this out.
		   However - this might make sense for framing errors and so on 
		   so I am leaving the code in for now.
		*/
		else {
			if (error_flag != TTY_NORMAL){
				dbg("error_flag is not normal");
				/* In this case it is just status - if that is an error send a bad character */
				if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
					tty_flip_buffer_push(tty);
				}
				tty_insert_flip_char(tty, 0xff, error_flag);
				need_flip = 1;
			}
		}
#endif
	} /* "for(packet_offset=0..." */

	/* Low latency */
	if (need_flip) {
		tty_flip_buffer_push(tty);
	}

	/* if the port is closed stop trying to read */
	if (port->open_count > 0){
		/* Continue trying to always read  */
		usb_fill_bulk_urb(port->read_urb, port->serial->dev, 
			      usb_rcvbulkpipe(port->serial->dev, port->bulk_in_endpointAddress),
			      port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length,
			      ftdi_read_bulk_callback, port);

		result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
		if (result)
			err("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
	}

	return;
} /* ftdi_process_read */


static void ftdi_break_ctl( struct usb_serial_port *port, int break_state )
{
	struct ftdi_private *priv = usb_get_serial_port_data(port);
	__u16 urb_value = 0; 
	char buf[1];
	
	/* break_state = -1 to turn on break, and 0 to turn off break */
	/* see drivers/char/tty_io.c to see it used */
	/* last_set_data_urb_value NEVER has the break bit set in it */

	if (break_state) {
		urb_value = priv->last_set_data_urb_value | FTDI_SIO_SET_BREAK;
	} else {
		urb_value = priv->last_set_data_urb_value; 
	}

	
	if (usb_control_msg(port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0),
			    FTDI_SIO_SET_DATA_REQUEST, 
			    FTDI_SIO_SET_DATA_REQUEST_TYPE,
			    urb_value , priv->interface,
			    buf, 0, WDR_TIMEOUT) < 0) {
		err("%s FAILED to enable/disable break state (state was %d)", __FUNCTION__,break_state);
	}	   

	dbg("%s break state is %d - urb is %d", __FUNCTION__,break_state, urb_value);
	
}


/* old_termios contains the original termios settings and tty->termios contains
 * the new setting to be used
 * WARNING: set_termios calls this with old_termios in kernel space
 */

static void ftdi_set_termios (struct usb_serial_port *port, struct termios *old_termios)
{ /* ftdi_termios */
	struct usb_device *dev = port->serial->dev;
	unsigned int cflag = port->tty->termios->c_cflag;
	struct ftdi_private *priv = usb_get_serial_port_data(port);
	__u16 urb_value; /* will hold the new flags */
	char buf[1]; /* Perhaps I should dynamically alloc this? */
	
	// Added for xon/xoff support
	unsigned int iflag = port->tty->termios->c_iflag;
	unsigned char vstop;
	unsigned char vstart;
	
	dbg("%s", __FUNCTION__);

	/* Force baud rate if this device requires it, unless it is set to B0. */
	if (priv->force_baud && ((port->tty->termios->c_cflag & CBAUD) != B0)) {
		dbg("%s: forcing baud rate for this device", __FUNCTION__);
		port->tty->termios->c_cflag &= ~CBAUD;
		port->tty->termios->c_cflag |= priv->force_baud;
	}

	/* Force RTS-CTS if this device requires it. */
	if (priv->force_rtscts) {
		dbg("%s: forcing rtscts for this device", __FUNCTION__);
		port->tty->termios->c_cflag |= CRTSCTS;
	}

	cflag = port->tty->termios->c_cflag;

	/* FIXME -For this cut I don't care if the line is really changing or 
	   not  - so just do the change regardless  - should be able to 
	   compare old_termios and tty->termios */
	/* NOTE These routines can get interrupted by 
	   ftdi_sio_read_bulk_callback  - need to examine what this 
           means - don't see any problems yet */
	
	/* Set number of data bits, parity, stop bits */
	
	urb_value = 0;
	urb_value |= (cflag & CSTOPB ? FTDI_SIO_SET_DATA_STOP_BITS_2 :
		      FTDI_SIO_SET_DATA_STOP_BITS_1);
	urb_value |= (cflag & PARENB ? 
		      (cflag & PARODD ? FTDI_SIO_SET_DATA_PARITY_ODD : 
		       FTDI_SIO_SET_DATA_PARITY_EVEN) :
		      FTDI_SIO_SET_DATA_PARITY_NONE);
	if (cflag & CSIZE) {
		switch (cflag & CSIZE) {
		case CS5: urb_value |= 5; dbg("Setting CS5"); break;
		case CS6: urb_value |= 6; dbg("Setting CS6"); break;
		case CS7: urb_value |= 7; dbg("Setting CS7"); break;
		case CS8: urb_value |= 8; dbg("Setting CS8"); break;
		default:
			err("CSIZE was set but not CS5-CS8");
		}
	}

	/* This is needed by the break command since it uses the same command - but is
	 *  or'ed with this value  */
	priv->last_set_data_urb_value = urb_value;
	
	if (usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
			    FTDI_SIO_SET_DATA_REQUEST, 
			    FTDI_SIO_SET_DATA_REQUEST_TYPE,
			    urb_value , priv->interface,
			    buf, 0, 100) < 0) {
		err("%s FAILED to set databits/stopbits/parity", __FUNCTION__);
	}	   

	/* Now do the baudrate */
	if ((cflag & CBAUD) == B0 ) {
		/* Disable flow control */
		if (usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				    FTDI_SIO_SET_FLOW_CTRL_REQUEST, 
				    FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
				    0, priv->interface, 
				    buf, 0, WDR_TIMEOUT) < 0) {
			err("%s error from disable flowcontrol urb", __FUNCTION__);
		}	    
		/* Drop RTS and DTR */
		if (set_dtr(port, LOW) < 0){
			err("%s Error from DTR LOW urb", __FUNCTION__);
		}
		if (set_rts(port, LOW) < 0){
			err("%s Error from RTS LOW urb", __FUNCTION__);
		}	
		
	} else {
		/* set the baudrate determined before */
		if (change_speed(port)) {
			err("%s urb failed to set baurdrate", __FUNCTION__);
		}
		/* Ensure  RTS and DTR are raised */
		else if (set_dtr(port, HIGH) < 0){
			err("%s Error from DTR HIGH urb", __FUNCTION__);
		}
		else if (set_rts(port, HIGH) < 0){
			err("%s Error from RTS HIGH urb", __FUNCTION__);
		}	
	}

	/* Set flow control */
	/* Note device also supports DTR/CD (ugh) and Xon/Xoff in hardware */
	if (cflag & CRTSCTS) {
		dbg("%s Setting to CRTSCTS flow control", __FUNCTION__);
		if (usb_control_msg(dev, 
				    usb_sndctrlpipe(dev, 0),
				    FTDI_SIO_SET_FLOW_CTRL_REQUEST, 
				    FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
				    0 , (FTDI_SIO_RTS_CTS_HS | priv->interface),
				    buf, 0, WDR_TIMEOUT) < 0) {
			err("urb failed to set to rts/cts flow control");
		}		
		
	} else { 
		/*
		 * Xon/Xoff code
		 *
		 * Check the IXOFF status in the iflag component of the termios structure
		 * if IXOFF is not set, the pre-xon/xoff code is executed.
		*/
		if (iflag & IXOFF) {
			dbg("%s  request to enable xonxoff iflag=%04x",__FUNCTION__,iflag);
			// Try to enable the XON/XOFF on the ftdi_sio
			// Set the vstart and vstop -- could have been done up above where
			// a lot of other dereferencing is done but that would be very
			// inefficient as vstart and vstop are not always needed
			vstart=port->tty->termios->c_cc[VSTART];
			vstop=port->tty->termios->c_cc[VSTOP];
			urb_value=(vstop << 8) | (vstart);

			if (usb_control_msg(dev,
					    usb_sndctrlpipe(dev, 0),
					    FTDI_SIO_SET_FLOW_CTRL_REQUEST,
					    FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
					    urb_value , (FTDI_SIO_XON_XOFF_HS
							 | priv->interface),
					    buf, 0, WDR_TIMEOUT) < 0) {
				err("urb failed to set to xon/xoff flow control");
			}
		} else {
			/* else clause to only run if cfag ! CRTSCTS and iflag ! XOFF */
			/* CHECKME Assuming XON/XOFF handled by tty stack - not by device */
			dbg("%s Turning off hardware flow control", __FUNCTION__);
			if (usb_control_msg(dev, 
					    usb_sndctrlpipe(dev, 0),
					    FTDI_SIO_SET_FLOW_CTRL_REQUEST, 
					    FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
					    0, priv->interface, 
					    buf, 0, WDR_TIMEOUT) < 0) {
				err("urb failed to clear flow control");
			}				
		}
		
	}
	return;
} /* ftdi_termios */


static int ftdi_tiocmget (struct usb_serial_port *port, struct file *file)
{
	struct ftdi_private *priv = usb_get_serial_port_data(port);
	unsigned char buf[2];
	int ret;

	dbg("%s TIOCMGET", __FUNCTION__);
	switch (priv->chip_type) {
	case SIO:
		/* Request the status from the device */
		if ((ret = usb_control_msg(port->serial->dev, 
					   usb_rcvctrlpipe(port->serial->dev, 0),
					   FTDI_SIO_GET_MODEM_STATUS_REQUEST, 
					   FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
					   0, 0, 
					   buf, 1, WDR_TIMEOUT)) < 0 ) {
			err("%s Could not get modem status of device - err: %d", __FUNCTION__,
			    ret);
			return(ret);
		}
		break;
	case FT8U232AM:
	case FT232BM:
	case FT2232C:
		/* the 8U232AM returns a two byte value (the sio is a 1 byte value) - in the same
		   format as the data returned from the in point */
		if ((ret = usb_control_msg(port->serial->dev, 
					   usb_rcvctrlpipe(port->serial->dev, 0),
					   FTDI_SIO_GET_MODEM_STATUS_REQUEST, 
					   FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
					   0, priv->interface, 
					   buf, 2, WDR_TIMEOUT)) < 0 ) {
			err("%s Could not get modem status of device - err: %d", __FUNCTION__,
			    ret);
			return(ret);
		}
		break;
	default:
		return -EFAULT;
		break;
	}
	
	return  (buf[0] & FTDI_SIO_DSR_MASK ? TIOCM_DSR : 0) |
		(buf[0] & FTDI_SIO_CTS_MASK ? TIOCM_CTS : 0) |
		(buf[0]  & FTDI_SIO_RI_MASK  ? TIOCM_RI  : 0) |
		(buf[0]  & FTDI_SIO_RLSD_MASK ? TIOCM_CD  : 0) |
		priv->last_dtr_rts;			
}

static int ftdi_tiocmset(struct usb_serial_port *port, struct file * file, unsigned int set, unsigned int clear)
{
	int ret;
	
	dbg("%s TIOCMSET", __FUNCTION__);
	if (set & TIOCM_DTR){
		if ((ret = set_dtr(port, HIGH)) < 0) {
			err("Urb to set DTR failed");
			return(ret);
		}
	}
	if (set & TIOCM_RTS) {
		if ((ret = set_rts(port, HIGH)) < 0){
			err("Urb to set RTS failed");
			return(ret);
		}
	}
	
	if (clear & TIOCM_DTR){
		if ((ret = set_dtr(port, LOW)) < 0){
			err("Urb to unset DTR failed");
			return(ret);
		}
	}	
	if (clear & TIOCM_RTS) {
		if ((ret = set_rts(port, LOW)) < 0){
			err("Urb to unset RTS failed");
			return(ret);
		}
	}
	return(0);
}


static int ftdi_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
{
	struct ftdi_private *priv = usb_get_serial_port_data(port);

	int  ret, mask;
	
	dbg("%s cmd 0x%04x", __FUNCTION__, cmd);

	/* Based on code from acm.c and others */
	switch (cmd) {

	case TIOCMBIS: /* turns on (Sets) the lines as specified by the mask */
		dbg("%s TIOCMBIS", __FUNCTION__);
 	        if (get_user(mask, (unsigned long __user *) arg))
			return -EFAULT;
  	        if (mask & TIOCM_DTR){
			if ((ret = set_dtr(port, HIGH)) < 0) {
				err("Urb to set DTR failed");
				return(ret);
			}
		}
		if (mask & TIOCM_RTS) {
			if ((ret = set_rts(port, HIGH)) < 0){
				err("Urb to set RTS failed");
				return(ret);
			}
		}
		return(0);
		break;

	case TIOCMBIC: /* turns off (Clears) the lines as specified by the mask */
		dbg("%s TIOCMBIC", __FUNCTION__);
 	        if (get_user(mask, (unsigned long __user *) arg))
			return -EFAULT;
  	        if (mask & TIOCM_DTR){
			if ((ret = set_dtr(port, LOW)) < 0){
				err("Urb to unset DTR failed");
				return(ret);
			}
		}	
		if (mask & TIOCM_RTS) {
			if ((ret = set_rts(port, LOW)) < 0){
				err("Urb to unset RTS failed");
				return(ret);
			}
		}
		return(0);
		break;

		/*
		 * I had originally implemented TCSET{A,S}{,F,W} and
		 * TCGET{A,S} here separately, however when testing I
		 * found that the higher layers actually do the termios
		 * conversions themselves and pass the call onto
		 * ftdi_sio_set_termios. 
		 *
		 */

	case TIOCGSERIAL: /* gets serial port data */
		return get_serial_info(port, (struct serial_struct __user *) arg);

	case TIOCSSERIAL: /* sets serial port data */
		return set_serial_info(port, (struct serial_struct __user *) arg);

	/*
	 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
	 * - mask passed in arg for lines of interest
	 *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
	 * Caller should use TIOCGICOUNT to see which one it was.
	 *
	 * This code is borrowed from linux/drivers/char/serial.c
	 */
	case TIOCMIWAIT:
		while (priv != NULL) {
			interruptible_sleep_on(&priv->delta_msr_wait);
			/* see if a signal did it */
			if (signal_pending(current))
				return -ERESTARTSYS;
			else {
				char diff = priv->diff_status;

				if (diff == 0) {
					return -EIO; /* no change => error */
				}

				/* Consume all events */
				priv->diff_status = 0;

				/* Return 0 if caller wanted to know about these bits */
				if ( ((arg & TIOCM_RNG) && (diff & FTDI_RS0_RI)) ||
				     ((arg & TIOCM_DSR) && (diff & FTDI_RS0_DSR)) ||
				     ((arg & TIOCM_CD)  && (diff & FTDI_RS0_RLSD)) ||
				     ((arg & TIOCM_CTS) && (diff & FTDI_RS0_CTS)) ) {
					return 0;
				}
				/*
				 * Otherwise caller can't care less about what happened,
				 * and so we continue to wait for more events.
				 */
			}
		}
		return(0);
		break;
	default:
		break;
		
	}


	/* This is not necessarily an error - turns out the higher layers will do 
	 *  some ioctls itself (see comment above)
	 */
	dbg("%s arg not supported - it was 0x%04x - check /usr/include/asm/ioctls.h", __FUNCTION__, cmd);

	return(-ENOIOCTLCMD);
} /* ftdi_ioctl */


static void ftdi_throttle (struct usb_serial_port *port)
{
	struct ftdi_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;

	dbg("%s - port %d", __FUNCTION__, port->number);

	spin_lock_irqsave(&priv->rx_lock, flags);
	priv->rx_flags |= THROTTLED;
	spin_unlock_irqrestore(&priv->rx_lock, flags);
}


static void ftdi_unthrottle (struct usb_serial_port *port)
{
	struct ftdi_private *priv = usb_get_serial_port_data(port);
	int actually_throttled;
	unsigned long flags;

	dbg("%s - port %d", __FUNCTION__, port->number);

	spin_lock_irqsave(&priv->rx_lock, flags);
	actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
	priv->rx_flags &= ~(THROTTLED | ACTUALLY_THROTTLED);
	spin_unlock_irqrestore(&priv->rx_lock, flags);

	if (actually_throttled)
		ftdi_process_read(port);
}

static int __init ftdi_init (void)
{
	int retval;

	dbg("%s", __FUNCTION__);
	retval = usb_serial_register(&ftdi_SIO_device);
	if (retval)
		goto failed_SIO_register;
	retval = usb_serial_register(&ftdi_8U232AM_device);
	if (retval)
		goto failed_8U232AM_register;
	retval = usb_serial_register(&ftdi_FT232BM_device);
	if (retval)
		goto failed_FT232BM_register;
	retval = usb_serial_register(&ftdi_FT2232C_device);
	if (retval)
		goto failed_FT2232C_register;
	retval = usb_serial_register(&ftdi_USB_UIRT_device);
	if (retval)
		goto failed_USB_UIRT_register;
	retval = usb_serial_register(&ftdi_HE_TIRA1_device);
	if (retval)
		goto failed_HE_TIRA1_register;
	retval = usb_register(&ftdi_driver);
	if (retval) 
		goto failed_usb_register;

	info(DRIVER_VERSION ":" DRIVER_DESC);
	return 0;
failed_usb_register:
	usb_serial_deregister(&ftdi_HE_TIRA1_device);
failed_HE_TIRA1_register:
	usb_serial_deregister(&ftdi_USB_UIRT_device);
failed_USB_UIRT_register:
	usb_serial_deregister(&ftdi_FT2232C_device);
failed_FT2232C_register:
	usb_serial_deregister(&ftdi_FT232BM_device);
failed_FT232BM_register:
	usb_serial_deregister(&ftdi_8U232AM_device);
failed_8U232AM_register:
	usb_serial_deregister(&ftdi_SIO_device);
failed_SIO_register:
	return retval;
}


static void __exit ftdi_exit (void)
{

	dbg("%s", __FUNCTION__);

	usb_deregister (&ftdi_driver);
	usb_serial_deregister (&ftdi_HE_TIRA1_device);
	usb_serial_deregister (&ftdi_USB_UIRT_device);
	usb_serial_deregister (&ftdi_FT2232C_device);
	usb_serial_deregister (&ftdi_FT232BM_device);
	usb_serial_deregister (&ftdi_8U232AM_device);
	usb_serial_deregister (&ftdi_SIO_device);

}


module_init(ftdi_init);
module_exit(ftdi_exit);

MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL");

module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");